Cutter and method of its production

FIELD: process engineering.

SUBSTANCE: invention relates to production of cutters from cemented carbide with superhard tips for destruction of hard and abrasive materials. Cutter (100) comprises insert (110) including superhard tip (112) jointed with support body (114) from cemented carbide with stem (118) and steel holder (120) for said insert (110). Steel holder (120) comprises shaft (122) for connection with tool arbour (not shown) and channel (126) to accommodate stem (118). Said stem fits in said channel through at least 4 cm. Volume of support body (114) from cemented carbide makes at least 10 cm3. Stem surface area adjoins the channel surface inner area making at least 20 cm3 while stem diameter making at least 1.5 cm and not over 4.0 cm. Cutter stem is fitted in steel holder channel with interference fit of 0.002-0.3%.

EFFECT: higher tool hardness, longer life.

13 cl, 11 dwg, 1 tbl

 

The prior art prior to the invention of

The invention generally relates to cutters with superhard tips, in particular but not only, for the destruction of solid or abrasive materials, such as stone, asphalt, coal or concrete, as well as the manufacture method.

Cutters can be used for breaking, drilling or destruction otherwise structures or materials such as stone, asphalt, coal or concrete, and can be used in the mining industry, in the construction or repair of roads. For example, the repair of roads many cutters can be mounted on a rotating drum for removal of asphalt pavement as the drum rotates. A similar approach can be used to break rocks, for example, in coal mining. Some cutters may have a working tip of the artificial diamond, which may have a higher resistance to abrasion than the working tips of cemented tungsten carbide. Meanwhile, synthetic or natural diamond materials are usually more fragile and less resistant to fracture than cemented carbide materials, which limits their possible applicability when cutting. There is therefore a need for a cutter with a longer lifespan.

In the application of the U.S. 2008/0035383 revealing what is the tool with high impact resistance, which is a substrate of cemented carbide metal deposited superhard material, the substrate of cemented carbide metal is connected with the front edge of the segment of the cemented carbide of the metal, the shank of which is formed at the edge of the base, the shank is pressed into the channel steel holder. Steel holder rotationally mounted on the drum which can rotate around the axis.

Summary of the invention

According to the first aspect of the proposed cutter (also called a superhard cutter) with insert (also referred to as the cutting insert), placed in a steel holder, the insert has a superhard tip connected with the supporting body of cemented carbide at the edge of the support body, the support body includes a shank (also referred to simply handle)steel holder has a channel that is designed to place him in the shank and the shaft, designed for the installation of a steel holder to a tool holder, such as the drive for installation of the cutter; the volume of the supporting body of cemented carbide is at least 6 cm3at least 10 cm3or, at least 15 cm3. The shank can be installed in the duct by means of shrink fit. According to another aspect, a set of components is La this cutter, the kit is in a disassembled or partially assembled state.

According to the second aspect proposes a method of manufacturing a cutter, the method includes receiving insert and a steel holder for the insert, the insert contains a superhard tip connected with the supporting body of cemented carbide shank; the steel holder includes a shaft that is designed for connection with a tool holder, and also has a channel that fits in the shank; the shank is at least 15 cm3; and a shrink fit of the shank in the channel steel holder.

According to a third aspect proposes a method of disassembly of the cutter, the method includes heating a steel holder for the expansion of the channel and removing the shank from the channel.

Brief description of drawings

Non-limiting typical layout illustrating the disclosure of the present invention will be described below with reference to the accompanying drawings.

On figa schematically, partly in section, at the side view shows an example of a cutter.

On FIGU schematically, at the side view shows the insertion of a standard cutter for figa.

On figs partially in section, in the form shown in perspective steel holder model cutter for figa.

Figure 2 schematically, partly in section, at the side view shows an example of a cutter.

Figure 3 schematically, partly in section, at the side view shows an example of a cutter.

Figure 4 schematically, partly in section, at the side view shows an example of a cutter, the size of which is specified in millimeters.

Figure 5 schematically, partly in section, at the side view shows an example of a cutter, the size of which is specified in millimeters.

Figure 6 schematically, partly in section, at the side view shows an example of a cutter, the size of which is specified in millimeters.

7 schematically, in longitudinal section shows an example of a superhard tip and part of the body of one of any standard cutters figures 1A through 6.

On Fig schematically, at the side view shows an example of a superhard tip and part of the support base of one of any standard cutters figures 1A through 6, with dimensions in millimeters, and the values of angles in degrees.

Figure 9 schematically, partly in section, showing an example of a typical cutter mounted in the casing mandrel, and is visible only part of the cutter.

Figure 10 schematically, at the side view shows an example of a cutter for a different frame, different from that depicted in Fig.9.

Figure 11 schematically, partly in section, at the side view shows an example of a cutter, with a part of the steel holder in a worn condition.

In all the drawings the same characteristics, in General, indicated a similar seloc the diversified positions.

Detailed description of the invention

Used herein, the term "superhard" means the number of the hardness Vickers hardness of at least 25 GPA, and superhard tool, insert or component means the tool, insert or component containing superhard material.

Examples of superhard materials are synthetic and natural diamond, polycrystalline diamond (PCD), cubic boron nitride (CBN) and polycrystalline CBN (PCNB). Used here is artificial diamond, also called synthetic diamond is diamond material made by man. Used here is polycrystalline diamond (PCD) contains the mass (the total number of diamond grains, a substantial portion of which are directly connected with each other and in which the diamond content is at least 80 volume percent of the material. The voids between the diamond grains may be at least partially filled with a bonding material containing a catalytic material for artificial diamond, or they can be essentially empty. Used here is a catalytic material for artificial diamond promotes grain growth artificial diamond or directs the growth of grains artificial or natural diamond at a temperature of the pressure when synthetic or natural diamond is thermodynamically stable. Examples of the catalyst materials are Fe, Ni, Co and Mn, as well as some of their alloys. Materials containing polycrystalline diamond PCD may include at least one area in which the catalyst material has been removed from the cavities, leaving the intermediate cavity between the diamond grains. Used here is the material PCNB contains grains of cubic boron nitride (CBN), dispersed in a matrix containing a metal or ceramic material.

Other examples of superhard materials include separate composite materials containing diamond grains or CBN held together by a matrix containing ceramic material such as silicon carbide (SiC), or cemented carbide material, such as associated with cobalt (Co), tungsten carbide (for example like the one shown in U.S. patent No. 5453105 or 6919040). For example, a single diamond materials associated SiC may contain at least 30 volume percent of grains dispersed in the matrix of SiC (which may contain a small amount of Si in a different form than in SiC). Examples of diamond materials associated SiC discussed in U.S. patent№№7008672; 6709747; 6179886; 6447852; as well as in the application WO2009/013713.

Examples of configurations of cutters for the destruction of the solid or abrasive materials or structures described with reference to figures 1A through 6.

Examples cutters 100 contain the insert 110 and the steel holder 120 to insert 110. The insert 110 includes a superhard tip 112 connected to the base body 114 of the cemented carbide with a shank 118. In these examples, the shanks 118, in General, have a cylindrical shape and an average diameter D, superhard tips 112 contain the appropriate patterns 111 of the polycrystalline diamond PCD associated with the substrate 113 of the cemented carbide, which are connected with the respective support blocks 114 in the appropriate places 115 mates with solid solder and the base body 114 have a generally truncated-conical portion 116 to which is soldered superhard tip 112. Steel holders 120 contain the shafts 122 for connection with a cutting drum device (not shown), and the channels 126 are made with hot planting in them false cuttings 118. Steel casing 120 can be provided with corresponding receiving elements 124 for inserts, in which are formed channels 126.

At least part of the shank 118 may be secured within the channel 126 through a shrink fit. Used here is hot landing means a kind of an interference fit between the elements provided by the relative changes in size, at least one of the components (forms, which also may vary slightly). This is usually accomplished by heating or cooling one component before Assembly and return it to ambient temperature after Assembly. Shrink fit is different from pressing, at which the force is placed in the channel or recess within another component that may be associated with significant frictional stress between the components.

Hot planting usually occurs in the field (not labeled) of the steel holder 120, adjacent to the channel 126, which is in a static condition of the district stretching tension. In some examples, the incisor region inside the steel holder adjacent to the channel may be in the state district (or rim) tensile tension constituting at least 300 MPa, or at least 350 MPa, and a separate cutters circumferential static tensile tension can reach almost up to 450 MPa or almost up to 500 MPa. Used here is the state of the static voltage of the instrument or item refers to the state of stress tool or element in static conditions, which may exist when a tool or item is not used.

Some typical cutters part 119 of the support body 114, including truncated-cone portion 116 may be of a steel frame 120 and beyond the mountains is owino 128 channel 126. In some examples, the diameter of the protruding part 119 along the entire length of the protruding part can be a maximum of 5% more or essentially no more than an average diameter D of the channel 126. In the examples depicted in figures 1A-6, the diameter of the protruding part 119, essentially, does not exceed the diameter of the channel 126.

One of the options for the implementation of the sleeve surrounds at least part of the protruding segment of the support body of cemented carbide, and in another variant implementation of the cuff can dress with the help of a shrink-fit on the protruding portion. One of the options for the implementation of the cuff has a lower hardness and resistance to abrasive wear than cemented carbide, and in another variant implementation of the cuff consists of steel. In one of the examples cuff connected with steel holder by means of soldering. The cuff can act as a support or protect the supporting body of cemented carbide.

With reference to the modification of the model of the cutter shown in figures 2 and 4, the sleeve 130 is located around the part of the speaker segment 119 of the support body 114. The sleeve 130 may surround at least part of the protruding segment 119, and in one of the examples cuff 130 may be placed on the protruding segment using a shrink fit. The sleeve 130 may have a lower hardness and resistance to AB is asinou wear, than cemented carbide, and may consist of steel. One of the options for the implementation of cuff 130 is connected with a steel holder 120 by soldering. The cuff can act as a support and defend the base body 114 of the cemented carbide. The sleeve 130 may have a different shape, such as generally conical or generally rounded and can be essentially symmetrical or asymmetrical. At least part of the outer surface of cuff 130 may be protected with a wear-resistant hard surface (not shown), for example a layer or sleeve containing tungsten carbide. In particular, at least a portion 127 of the outer surface of a steel holder 120, adjacent to the neck 128 of the channel 126, for example the surface area of the receiving element 124 to insert protruding from the cap 127 to a distance of 20 mm, can be protected with a wear-resistant means (not shown). Examples of such means may be a layer or sleeve containing tungsten carbide and/or grains of superhard material such as diamond or CBN. In one of the examples cuff 130 may have a protective hard coating, located mainly on the face, which are more susceptible to wear and tear during use.

With reference to figure 3 a large portion of the shank 118 is fixed within the channel 126 scalenohedral 120 by means of shrink fit. In this example, the receiving element 124 to insert provided with a mounting seat 129, in front of which can be located bearing housing 114. In the seat 129 may have a through hole 1291 to facilitate extraction of the insert 112 or prepaymania end of the shank 118 to the housing 129. For example, a through hole 1291 seats 129 may have a diameter of S is at least 0.6 cm and a maximum of about 2 cm of the Receiving element 124 to insert may have an external size W, which may be about 4.8 see generally, the larger the diameter D of the shank 118 of the support body 114, the thinner may be the wall of the receiving element 124 to insert, forming a channel 126, since the external dimensions of the steel holder 120 can be limited by the design of the cutting device (not shown) or the needs of the cutting operation. For example, the thicker the wall of the receiving element to be inserted, the more durable is more likely, in General, is the cutter, however, likely energy consumption during use and wear of steel will be higher.

In the examples depicted in figures 1A, 2 and 4, the channel 126 can pass through the holder 120, forming a through hole with a pair of opposite open ends or mouths) 128. In these examples, at least part of the shank 118 can pass essentially through the receiving e is ement 124 to insert.

In some examples, the incisors of the ratio of the volume of the support body of cemented carbide to the volume of the superhard structure comprises at least about 1:30, at least about 1:40 or at least about 1:50. On separate variants of implementation, the ratio of the volume of the support body of cemented carbide to the volume of the superhard structure comprises a maximum of about 1:300 and a maximum of about 1:200 or a maximum of about 1:150. On separate variants of the implementation of the volume of superhard structure is at least about 200 mm3or at least about 300 mm3. On separate variants of the implementation of the volume of superhard structure comprises a maximum of about 500 mm or a maximum of about 400 mm.

Individual modifications incisors length of the channel may be at least equal to its diameter. In one example, the diameter of the shank and the channel may be about 2.5 cm, and the length of the channel and the plug shank may be about 6 cm, hence, the volume of the channel and the plug shank may be about 29 cm3and the contact area between the inner peripheral surface of the channel and the shank may be about 47 cm2. In another example, the diameter of the shank and the channel can be about 2 cm, and the length of the channel and the plug shank may be about 8.3 cm, CL is therefore the volume of the channel and the plug shank may be about 26 cm3and the contact area between the inner peripheral surface of the channel and the shank may be about 52 cm2. In another example, the diameter of the shank and the channel can be about 3.5 cm, and the length of the channel and the plug shank may be about 6.9 cm; therefore, the volume of the channel and the plug shank may be about 66 cm3and the contact area between the inner peripheral surface of the channel and the shank may be about 76 cm2.

In some examples, the cutters shank may not be essentially cylindrical and may be of any shape in cross section. For example, the shape of the shank may be generally elliptical, egg-shaped, wedge-shaped, square, rectangular, polygonal or semicircular; or the shape of the section of the shank may vary in length.

In some examples, the handle may be essentially cylindrical shape and a diameter of at least about 15 mm, at least about 20 mm, at least about 25 mm, or at least 30 mm On separate variants of implementation, the diameter of the cutting is a maximum of about 20 mm, a maximum of about 25 mm, a maximum of about 30 mm, a maximum of about 35 mm, or even a maximum of about 40 mm. On separate variants of implementation, the diameter of the cutting, throughout his DL is not, changes less than about 5 mm, or a diameter along the entire length essentially remains the same

The table below summarizes the individual typical combinations of sample sizes that can be used for modifications of the incisors. Sizes indicate the channel length and the length of the plug shank, the average diameter of the channel and the plug shank, the minimum volume of the channel and the volume of the plug shank and the contact area between the inner peripheral wall of the channel and the corresponding surface of the plug shank.

andbdefe
The channel length/length L of the input shaft, cm7.07.74.96.566.56.7
The diameter D of the channel/shank, cm2.02.02.52.52.5 3.03.5
Volume channel/plug shaft, cm322242432294664
The contact area of the channel and the shank, cm244483851476173

On separate variants of realization of the reference frame includes a cemented carbide material having a fracture strength to a maximum of about 17 MPa·m1/2a maximum of about 13 MPa·m1/2a maximum of about 11 MPa·m1/2or even a maximum of about 10 MPa·m1/2. On separate variants of realization of the reference frame includes a cemented carbide material having a fracture toughness of at least about 8 MPa·m1/2or, at least, about 9 to 10 MPa·m1/2. On separate variants of realization of the reference frame includes a cemented carbide material having a transverse rupture strength of at least about 2100 MPa, at least about 2300 MPa, at least about 2700 MPa or even at least about 3000 MPa.

On separate variants of realization of the reference frame includes a cemented carbide material containing grain carbide metal with an average maximum of about 8 microns or at most about 3 microns. One of the options for the implementation of the supporting frame includes a cemented carbide material containing grain carbide metal with an average size of at least about 0.1 micron.

On separate variants of realization of the reference frame includes a cemented carbide material containing a maximum of about 13 weight percent, a maximum of about 10 weight percent, a maximum of about 7 weight percent, a maximum of about 6 weight percent, or even a maximum of about 3 weight percent of the binder metal material such as cobalt (Co). On separate variants of realization of the reference frame includes a cemented carbide material containing at least about 1 weight percent, at least about 3 weight percent or at least about 6 percent by weight metal binder.

On separate variants of the implementation of the supporting body may essentially consist of or consist of cemented carbide material.

In some examples, the cutters shrink fit components may be reversible, and the steel holder and/or HVO who topic can be removed and re-used that, in fact, allows to reduce the cost of the cutter and to increase the service life of the steel holder. This can be achieved by heating the steel holder in the vicinity of the channel to expand relative to the shank of the cemented carbide that will allow you to remove the shank from the channel.

Features a method of manufacturing a cutter, the method includes receiving insert cutter containing superhard tip connected with the supporting body of cemented carbide at the end of the anchor body, the anchor body includes a shank (shank); obtaining steel holder with existing channel intended for the premises of the handle and contains a shaft that allows you to install the holder in the tool mandrel; and placing the handle in the channel steel holder with the help of a shrink-fit. The shank may be placed in channel steel holder with the help of a shrink-fit by heating at least part of the steel holder, including channel, to a temperature of about 350 degrees Celsius, place the handle in the channel is heated holder, and cooling and compression steel holder, thereby holding the shank in a compressed state. In examples where the steel holder includes a seat, the shank can be inserted in the channel t is d thus, to the inserted end face rested against the seat.

The interference fit between the shank and the channel of the holder is determined by the difference of their sizes, which can be expressed as a percentage sizes. For example, on the modalities for the implementation, where the shank (and channel) have a generally round cross-section, the tension can be expressed as the difference of the diameters as a percentage. Size between the shank and the channel is selected based at least on the diameter of the shank and may be at least about 0.002% of the diameter of the shank. In one example, the stem diameter is about 2.5 cm, and the fit between the shank and the channel is about 0.08 percent of the diameter of the shank. The tension between the push handle and the channel can be a maximum of about 0.3 percent of the diameter of the shank. If the tension is too large, the limit of elasticity of the steel material of the holder may be exceeded if the steel holder is worn on the shank by means of hot planting, which will result to a certain plastic deformation of the steel near the channel. If the tension is too weak, then shrink fit may be sufficient to ensure that the insert is firmly held by the holder during use.

On separate variants of the method the exact dimensions of the shank and the channel which may be chosen so that so after shrink fit of the shank in the channel region inside the steel holder adjacent to the channel, were in the state district (or rim) static tensile stress, comprising at least about 300 MPa or at least about 350 MPa. On separate variants of implementation of the area inside the steel holder adjacent to the channel is in the state district (or rim) static tensile stress, comprising at least about 450 MPa or at least about 500 MPa.

As a non-limiting example of the disclosed cutter may include a superhard tip, similar to that described in published application U.S. 2009/0051211; 2010/0065338; 2010/0065339 or 2010/0071964. With reference to Fig.7. an example of insertion for the variant of implementation of the cutter contains a superhard tip 112 with a superhard structure 111, in General, have the form of a cap, coupled with the substrate 113 of the cemented carbide. Superhard tip 112 is connected with the truncated-conical part 116 of the support body 114. A large part of the superhard structure 111 has a spherically blunted cone outer part with a rounded top 1111, having a radius of curvature in the longitudinal plane and the angle to between the axis parallel to the longitudinal axis AL and a conical part 1112 outer surface of the superhard the th design 111. Superhard structure 111 includes nasal area 1113 and skirt region 1114, which runs longitudinally and transversely away from the nasal area 1113. Separate versions of the example, the minimum longitudinal thickness of the skirt region 1114 may be at least about 1.3 mm or at least 1.5 mm. separate versions of example, the longitudinal thickness of the superhard cap 111 at the top of 1111 is at least 4 mm or at least about 5 mm and a maximum of about 7 mm or a maximum of about 6 mm. In one of the modifications of the example of the longitudinal thickness of the superhard structure 111 at the top of 1111 is in range from about 5.5 mm to 6 mm On separate versions of the example, the radius of curvature of a rounded vertex is 1111 at least about 2 mm and a maximum of about 3 mm On separate variants of implementation, the angle To the cone is a maximum of 80 degrees or a maximum of 70 degrees. Separate versions of the example, the angle To the cone is at least 45 degrees or at least 50 degrees.

With reference to Fig example insert for variant implementation of the cutter contains a superhard tip 112 with a superhard structure 111 that is associated with the substrate 113 of the cemented carbide. Superhard tip 112 is connected with the truncated-conical part 116 of the support body 114. The radius R of curvature of the spherically setupin the second tapered nose portion 1111 is about 2.25 mm, and the angle of the cone is about 42 degrees.

With reference to Fig.9 part of the example steel holder 120 of the cutter attached to the unit 200 of the base (body frame) through vzaimoponimajus4ej mounting mechanism 210, and the shaft 122 steel holder 120 is fixed within the channel formed inside the housing 200 of the mandrel. Also shows part of the shank 118 of the standard cutter. The shaft 122 may be Rethimno connected to the base unit 200, which is welded or otherwise connected to the drum. The base unit 200 and the holder 120, more precisely, the shaft 122 may be configured to provide releasable mutual engagement of steel holder 120 with the base Assembly. The shaft 122 may be made with the possibility of mutual engagement with the base Assembly without rotation and can be used with the tool mandrel, disclosed, for example, in patents DE 10161713 B4 and DE 102004057302 A1. Instrumental mandrel, such as the base Assembly may be welded to the component of the drive device, such as a drum, to actuate the superhard cutter. Figure 10 at the side view shows the cutter 100 for another tool holder, different from the example shown in figure 9, the shaft 122 of the steel holder 120 is made otherwise. The cutter 100 includes a box 110 with a superhard tip 112 that is connected to part 116 reference is orpus.

Suggested mounting method of superhard cutter in the tool mandrel connected to a component of the drive device, the method includes the connection insert cutter with steel holder for education cutter, steel holder includes a shaft made with the possibility of functional fastening steel holder in the tool mandrel, the tool mandrel includes means for gearing, designed to accommodate steel shaft holder; and then fastening superhard cutter in the tool mandrel. One variant of the method the tool mandrel is welded to a component of a drive device, such as a drum, to actuate the superhard cutter.

During use, the cutter can move a drive device on which it is installed, forward, relatively destructible patterns, and superhard tip is located at the leading end. For example, on a drum for fracture of asphalt that can be used to remove the paintings in the repair of roads, can be installed a lot of cutters. The drum is connected with the vehicle and is driven into rotation. When approaching the drum to the road pavement cutters repeatedly hit on the road surface as the drum rotates through which leading superhard tips reveal the asphalt. A similar approach can be used to break rocks in coal mining.

With reference to 11 schematically shows a typical cutter in figure 5 in a worn condition, and during the part 1201 steel holder 120 has been worn to such an extent that it became visible to surface plug-in shaft 118 of the insert being adjacent to this part 1201.

Although typical cutter shown figure 11, shown in a worn state, the individual cutters can be equipped with cutting part 1201 before use. In this arrangement, the shank 118 is only partially surrounded by the channel 126 in the range of axial positions R on the length L of the shank 118 (i.e., in the range R, the axial positions of the shaft 118 is not completely surrounded or covered by a steel holder 120).

When designing cutting tools for abrasive operations in the destruction of such materials as asphalt, coal or potash, it is desirable to strike a balance between the cost of the instrument and its resistance to abrasion and breakage during use. Superhard materials such as synthetic diamond, usually have a high resistance to abrasive wear, but have a higher cost compared to the material of cemented carbide, which in turn have a higher abrasive resistance, nataku and higher cost compared to steel materials. One approach may be to minimize the content in the diamond tool and material of the cemented carbide according to their relative costs and to select the components containing such materials, thus, to achieve an acceptable service life of the tool.

The supporting body of cemented carbide, which occupies a relatively large volume, at least about 6 cm3at least about 10 cm3or at least about 15 cm3located behind the tip of the polycrystalline diamond PCD in the direction of movement during use and setting relatively deeply into the steel holder, it seems, surprisingly increases the tool life, which probably justifies the additional costs of carbide material.

Not wishing to be limited to a particular theory, the high density and relatively high mass of carbide shank, as well as its high stiffness can significantly increase support for PCD tip, preventing deformation or bending of the tip when it is thrust it breaks the structure. We can say that the shank carbide forms createbrush design, setting relatively deeply into the steel holder. Long shank carbide so the e can act as a reinforcing ridge the setting in a steel holder and makes it more durable.

It was found that the cutter with a superhard tip, which uses a combination of relatively large shank and the connection of the shank by means of a hot landing in a steel holder, has an increased operating life when used for removal of asphalt. If the volume of the plug shank is approximately less than 6 cm3approximately less than 15 cm3or even less than approximately 15 cm3, support for superhard tip during use may be sufficient; however, if the coupling between the shank and the channel will be less than about 20 cm2, the bearing housing carbide may not securely hold steel holder in which it is inserted using a shrink fit. If the stem diameter is less than 2 cm, in this case, it may not provide enough support and durability, which can be broken down, especially in harsh conditions, and/or may occur increased wear of the steel holder. If the length of the anchor body is approximately less than 4 cm, it may not provide sufficient support for the steel holder and/or the tip of the polycrystalline diamond PCD, which may prematurely break down.

In disclosed is x here the cutters, in which the volume of the shank and channel, as well as the contact area between them are large enough, shrink fit of the shank in a steel holder may provide advantages compared to injection. For shrink fit relatively large shank takes much less effort compared to its insertion into the channel. One aspect of this can be quite durable retention of the insert within the channel steel holder without significantly exceeding the elastic limit of the steel material, which reduces the plastic deformation of the steel holder. Not wishing to be limited to a particular theory, one aspect of this may be that the area of the steel holder adjacent to the channel, may be subjected to less strain and axial strain in the effort of pressing and friction between the shank and the surface of the channel. Components shank can also have less residual voltage, and thus can provide increased resistance to fracture during use. The lack of a shrink-fit is that may require more sophisticated equipment and technological process.

Hot planting can reduce the dependence on soldering at the connection of the insert with a steel holder. This can be a person who but convenient if superhard tip contains synthetic or natural diamond, for example, polycrystalline diamond, as there is less thermal destruction of the tip while soldering that requires high temperature (diamond, especially in the form of polycrystalline diamond PCD, usually has a relatively low thermal stability and high temperature turns into graphite). In addition, for soldering, you may need a special oven and the special atmosphere that may be no need for a shrink fit.

Below are examples of cutters. The following points are offered as additional descriptions disclosed incisors.

1. Superhard cutter (for brevity, also referred to as simply the cutter) contains an insert and a steel holder for the insert, the insert contains a superhard tip connected with the supporting body of cemented carbide shank; the steel holder includes a shaft connected with the tool mandrel, steel holder has a channel that is designed to place him in the shank; the volume of the supporting body of cemented carbide is at least 6 cm3at least 10 cm3or, at least 15 cm3.

2. Cutter, containing an insert and a steel holder for the insert, the insert contains superhard on onecnc, connected with the supporting body of cemented carbide shank; the steel holder includes a shaft connected with the tool mandrel, steel holder has a channel that is designed to place him in the shank; insertable portion of the shank is mounted in the channel; a plug portion has an axial length and average diameter; axial length not less than the average diameter.

3. The cutter according to claim 2, in which the axial length of the plug is at least about 4 cm, and a maximum of about 8.5, see

4. The cutter according to claim 2 or 3, in which the average diameter of the plug is at least about 2 cm, and a maximum of about 3.5, see

5. Cutter, containing an insert and a steel holder for the insert, the insert contains a superhard tip connected with the supporting body of cemented carbide shank; the steel holder includes a shaft connected with the tool mandrel, steel holder has a receiving element for insertion with the existing channel, intended to put him in the shank; insertable portion of the shank is mounted in the channel and depends on the surface area of the channel; the amount of hard surface area greater than the volume of the inserted part.

6. The cutter according to claim 5, in which the amount of hard surface area is at least about 20 cm2and the amount of sun avnoj part is, at least about 15 cm3.

7. The cutter according to any one of the preceding paragraphs, in which the shank is mounted within the channel using a hot landing.

8. Superhard cutter (for brevity, also referred to as simply "the cutter"), containing tool box, placed in a steel holder, the cutting insert (for brevity, also referred to as simply "insert") has a superhard tip connected with the supporting body of cemented carbide at the edge of the support body, the support body includes a shank, steel holder has a channel that is designed to place him in the shank and shaft designed for installation in the tool mandrel; the shank is inserted into the channel steel holder by means of a hot landing.

9. The cutter according to any one of the preceding paragraphs, in which the volume of the shank is at least 15 cm3.

10. The cutter according to any one of the preceding paragraphs, in which the surface area of the shank rests against a corresponding internal peripheral (side) surface area of the channel, the surface area is at least 20 cm2.

11. The cutter according to any one of the preceding paragraphs, in which the stem diameter (or average diameter) is at least 1.5 cm or of at least 2 cm and a maximum of 4.0 with the or at most 3.5, see

12. The cutter according to any one of the preceding paragraphs, in which the length of the shank and channel, each is at least about 4, see

13. The cutter according to any one of the preceding paragraphs, in which the ratio of the volume of the support body of cemented carbide to the volume of the superhard tip is at least 1:30 and a maximum of 1:300, and the volume of the superhard tip is at least 200 mm3and a maximum of 500 mm3.

14. The cutter according to any one of the preceding paragraphs, in which the volume of the superhard structure comprises at least 0.2 cm3.

15. The cutter according to any one of the preceding paragraphs, in which at least part of the shank has an essentially cylindrical shape.

16. The cutter according to any one of the preceding paragraphs, in which the channel length is at least equal to its diameter.

17. The cutter according to any one of the preceding paragraphs, which fit between the shank and the channel is at least 0.002% of the diameter of the shank, and a maximum of about 0.3 percent of the diameter of the shank.

18. The cutter according to any one of the preceding paragraphs, in which the area of the steel holder adjacent to the channel is in the state district (or rim) static tensile stress, comprising at least about 300 MPa and a maximum of about 500 MPa.

19. The cutter according to any one of the preceding paragraphs, in which the diameter of the shank varies less than about 5 mm over the entire length or diameter essentially remains unchanged along the entire length.

20. The cutter according to any one of the preceding paragraphs, in which the portion of the shank is only partially surrounded by a channel steel holder (in the range of axial positions along the length of the shank).

21. The cutter according to any one of the preceding paragraphs, in which the steel holder has a seat, in which is placed the end of the anchor body of cemented carbide. The channel can communicate with the outer part of the steel holder through the passage or hole passing through or near the landing place.

22. The cutter according to any one of the preceding paragraphs, in which the channel passes through the holder, forming a through hole with a pair of open ends.

23. The cutter according to any one of items 1 to 21, in which the channel is essentially closed at one end.

24. The cutter according to any one of the preceding paragraphs, in which part of the body of cemented carbide is made from steel holder and beyond the mouth of the channel.

25. The cutter according to paragraph 24, in which the diameter of the protruding part of the support body of cemented carbide throughout the length of extension of the maximum 5% larger than the diameter of the neck of the channel is, from where she stands.

26. The cutter according to paragraph 24, containing the cuff covering or surrounding at least part of the protruding segment.

27. The cutter according to any one of the preceding paragraphs, in which the diameter of the shank is at least 15 mm, at least 20 mm, at least 25 mm or even at least 30 mm (on separate variants of implementation, the diameter of the shank can be a maximum of about 20 mm, a maximum of about 25 mm, a maximum of about 30 mm, a maximum of about 35 mm, or even a maximum of about 40 mm).

28. The cutter according to any one of the preceding paragraphs, in which the superhard tip contains natural or synthetic diamond material or CSS.

29. The cutter according to any one of the preceding paragraphs, in which the superhard tip contains a structure of polycrystalline diamond associated with a substrate of cemented carbide.

30. The cutter according to any one of the preceding paragraphs, in which the superhard tip contains diamond grains in the matrix containing SiC or diamond grains dispersed in the matrix containing cemented carbide material.

31. The cutter according to any one of the preceding paragraphs, in which the supporting body of cemented carbide contains cemented carbide material having a fracture toughness of at least 8 MPa·m1/2and maximum MPa·m 1/2.

32. The cutter according to any one of the preceding paragraphs, in which the supporting body of cemented carbide contains cemented carbide material containing a maximum of 13 percent by weight and at least 1 weight percent of the metal binder.

33. The cutter according to any one of the preceding paragraphs, in which the support frame includes a superhard material (for example, the support body may include diamond or CBN grain dispersed in the matrix of cemented carbide).

34. The cutter according to any one of the preceding paragraphs, intended for removal of sidewalk or pavement or coal or potash.

35. The cutter according to any one of the preceding paragraphs, in which the tool mandrel is welded or can be welded to the component of the drive device, such as a drum, resulting in action superhard cutter.

36. The cutter according to any one of the preceding paragraphs, in which the tool mandrel contains or can be connected with a driving or driven device.

37. A method of manufacturing a cutter according to any one of the preceding paragraphs, the method includes receiving insert and a steel holder for the insert, the insert contains a superhard tip connected with the supporting body of cemented carbide shank; the steel is the first holder includes a shaft, designed for connection with a tool holder, in a steel holder has a channel that fits in the shank displacement of at least 6 cm3at least 10 cm3or, at least 15 cm3; and a shrink fit of the shank in the channel steel holder.

38. The method according to clause 37, which includes a selection of touching inserted between the shaft and the channel after a shrink-fit insertion of the shaft in the channel region inside the steel holder adjacent to the channel is in state district (or rim) static tensile stress, comprising at least about 300 MPa and a maximum of about 500 MPa, or essentially less than the elastic limit of the steel material, which consists of a steel core.

Below is one of non-limiting examples of the cutter described in more detailed.

Superhard tip containing polycrystalline diamond PCD, narashima bonded to a substrate of cemented cobalt-tungsten carbide (Co-WC) Fig, was soldered to the support housing. Volume patterns from polycrystalline diamond PCD was about 382 mm3. The reference case was formed of Co-WC, consisting of 13 weight percent, having a fracture toughness of about 16.3 MPa·m1/2and transverse rupture strength (TRS) of about 2200 MPa. In another example, the reference case would is formed from Co-WC, consisting of 8 weight percent, having a fracture toughness of about 14.6 MPa·m1/2and transverse rupture strength (TRS) of about 2800 MPa. The reference case contained essentially cylindrical shank and a truncated-conical end segment, which was soldered to the tip of the polycrystalline diamond PCD. The surface quality of the shank was in the range of from about 0.04 μm Ra to about 0.5 microns Ra. The stem diameter was 2.5 cm, and its length is 6.7 see

Was obtained steel holder, made of steel grade 42Cr-Mo and contains the receiving element to be inserted with the existing channel, the channel diameter was about 2.5 cm, and its length was about 6.7 see the Bottom of the channel was the ring seat. The liner was placed in the channel steel holder with the help of a shrink-fit due to the heat receiving element to insert steel holder in air to a temperature of about 350 degrees Celsius, the shaft was inserted into the heated channel of the holder, then the receiving element to be inserted allowed to sit on the shank, thereby holding it in a compressed state. The shank has been fully inserted into the channel so that the plug-in end abutted against the annular seat. The amount of insertion of the shank segment thus accounted for about 33 cm3and the region is obrazenia between the shank and the inner peripheral wall of the channel was approximately 53 cm 2. The interference fit between the shank and the channel was about 0.02 mm, and static rim tensile stress area steel holder adjacent to the channel, presumably, was in the range of from about 300 MPa to about 500 MPa.

The cutters according to the present example were tested in the repair of the road surface, during which they were installed on the drums and has been used for removal of asphalt pavement. After removing about 20 km of road coverage they were still in working condition.

We have considered various options for implementation of the incisors, as well as methods for their Assembly and connections. Specialists in this field will be clear that such examples allow making changes and modifications, without departing from the scope and essence of the claimed invention.

1. Cutter for destruction of solid or abrasive materials containing the insert and intended for her steel holder, the insert contains a superhard tip associated with the supporting body of cemented carbide, having a shank, and a steel holder has a shaft for connection with a tool holder and provided with a channel for the shank, while the volume of the support body of cemented carbide is at least 10 cm3the area powernotebooks adjacent to the corresponding inner surface of the channel, component of at least 20 cm3the diameter of the shank is at least 1.5 cm, and a maximum of 4.0 cm, and the shank enters the channel at least 4 see

2. The cutter according to claim 1, characterized in that the shank is installed inside the duct by means of shrink fit.

3. The cutter according to claim 1, wherein the superhard tip contains superhard structure with a volume of at least 200 mm3.

4. The cutter according to claim 1, characterized in that the ratio of the volume of the support body of cemented carbide to the volume of the superhard tip is at least 1:30 and a maximum of 1:300, and the volume of the superhard tip is at least 200 mm3and a maximum of 500 mm3.

5. The cutter according to claim 2, characterized in that the shank is at least 15 cm3.

6. The cutter according to claim 2, characterized in that the interference fit between the shank and the channel is at least 0.002 to 0.3 % of the diameter of the shank.

7. The cutter according to claim 2, characterized in that the portion of the shank is only partially surrounded by a channel steel holder.

8. The cutter according to claim 2, characterized in that the steel holder has a seat on which rests the end of the anchor body of cemented carbide.

9. The cutter according to claim 1, characterized in that the channel communicates with the outside of the steel holder across the aisle, RA is put next to the landing place.

10. The cutter according to claim 2, wherein the superhard tip contains artificial diamond material.

11. The cutter according to claim 2, characterized in that it is designed for removal of sidewalk or pavement or coal or potash.

12. A method of manufacturing a cutter according to claim 2, including the use of inserts containing superhard tip connected with the supporting body of cemented carbide with existing shank displacement of at least 10 cm3and steel holder, which includes a shaft for connection with a tool holder and has made the channel, and the installation in the channel steel holder shank by shrink fit with tightness of 0.002 to 0.3%.

13. The method according to item 12, characterized in that provide a choice of fit between the shank and channel after installation of the shank by a hot landing that in the channel region of a steel holder circumferential tensile stress in a static state is at least 300 to 500 MPa.



 

Same patents:

FIELD: process engineering.

SUBSTANCE: set of inventions relates to cutters with block made of polycrystalline diamond composite (PDC-cutters) and to method of their production. Diamond plate face surface secured to substrate is processed to remove embedded catalytic binder and to form a thermal channel. Then, material is embedded in diamond plate face surface. Embedded material fills the plate face surface for filling intermediate cavities left after removal of catalytic binder in thermal channel to preset depth. Said material should be less thermally expandable than catalytic binder, and/or more heat-conducting than catalytic binder, and/or feature lower heat capacity.

EFFECT: longer life, better thermal properties.

42 cl, 8 dwg

FIELD: process engineering.

SUBSTANCE: set of inventions relates to PDC-drill bits for well boring and to method of PDC-cutter arrangement at drill-bit blades. PDC-drill bit comprises several blades including primary blades and secondary blades. Primary blades are reinforced by PDC-cutters in compliance with single-seat method. Secondary blades are reinforced by PDC-cutters in compliance with multi-seat method so that every cutter at secondary blade sits in radial position identical to single-seat cutter located at primary blade, immediately ahead of said secondary blade. At least one said secondary blade is arranged immediately behind every primary blade to make a balanceable PDC-drill bit.

EFFECT: balanceable PDC-drill bit, higher boring rate, wear resistance and stability.

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FIELD: process engineering.

SUBSTANCE: set of inventions relates to cutters with block made of polycrystalline diamond composite (PDC-cutters) and to method of their production. Face surface of diamond plate secured to the substrate is processed for introduction of material to be connected or to partially fused with embedded catalytic binder or substitutes partially the imbedded catalytic binder in thermal channel at required depth. Material is selected so that it features lower thermal expansion and/or higher heat conductivity and/or has lower heat capacity than catalytic binder.

EFFECT: longer life, better thermal properties.

34 cl, 8 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention is related to drilling bits used in construction of deep oil and gas wells, mainly for horizontal wells. PDC bit for horizontal well drilling has a body with a connecting thread, PDC rock cutting elements placed in sequence at one or more lead-in conical screw blades divided by conical spiral grooves with openings for attachments and passage of the flushing fluid. The bit peak is made as an elongated protrusion with the diameter base equal to d=(0.6÷0.7)D and height of h=(0.4÷0.6)D from the outer diameter B of the bit equipped with PDC-elements placed in planes close to the ones parallel to the axis of the bit, at two or more blades and flushing openings with attachments that forms at drilling a preliminary niche and conical screw blades from there cut the rock remaining at the well wall with an increased self-screwing effect.

EFFECT: improvement of drilling mechanical speed, stabilisation of cutting structure operation.

3 dwg

FIELD: oil and gas industry.

SUBSTANCE: essence of the invention consists in manufacture of a slotted joint by enclosing a shank of cutters with enveloping and inner rings. Inner rings are installed into opposite cavities on the crown housing by their being squeezed into radial slots of the crown housing. With that, material is extruded from under the end face of puncheons with forcing of the shank of cutters by the extruded mass down to the trailing wall of the radial slot. As a result, the cutter shank turns out to be rigidly fixed in the crown housing, thus forming press fit.

EFFECT: reduction of stresses in drilling cutters of annular crowns; improving sinking on a drill crown or load on the crown so that it can drill harder rocks.

4 cl, 6 dwg

FIELD: mining.

SUBSTANCE: washing unit of a drilling bit comprises a body with a channel and a seat, in which a sealing element is placed, as well as an attachment fixed from axial displacement with a rod stop installed in combined grooves on the inner surface of the body seat and the outer surface of the attachment. In the groove on the outer surface of the attachment there is a composite ring, made of softer material compared to the attachment material, besides, the composite ring on the outer surface has a bore with the cross section in the form of a half-toroid, combined with the circular bore of the seat and forming jointly with it a channel for the rod stop.

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FIELD: mining.

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EFFECT: increased reliability and durability of a drill bit with replaceable washing units.

4 cl, 8 dwg

FIELD: mining.

SUBSTANCE: invention refers to a rock-destructing tool, and namely to bearing structures of rolling drilling bits. A rolling drilling bit bearing structure includes a trunnion, a rolling cutter fixed on the trunnion with a retaining bearing with a retainer against axial movement, and a sealing assembly with an O-ring, which is arranged at the trunnion bottom, and with a metal bushing made from spring steel, which is arranged inside it. The metal bushing of the sealing assembly is made in the form of a corrugated cylinder arranged in an O-ring cavity so that it can be turned; corrugations of the metal bushing have the shape of a sine curve and are located parallel to the trunnion axis.

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2 dwg

FIELD: mining.

SUBSTANCE: invention refers to flushing assemblies of a rock-destructing tool of water jet type. A flushing assembly of a rolling drilling bit with a central flushing system includes a housing with a channel and a seat, in which there fixed by means of a threaded bushing is a head piece with a sealing element and a torque transfer assembly. The latter is formed with inclined slots made on inner surface of the head piece; besides, direction of slots coincides with direction of the fastening bushing thread; the head piece and the bushing are provided with mating projections and cavities on contact surface for transfer of torque, and the number of slots corresponds to the number of rolling cutters. Slots are directed to space between rolling cutters and have conoidal shape.

EFFECT: improving drilling bit operating reliability and efficiency.

2 dwg

FIELD: mining.

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EFFECT: stability of PDC chisel operation, high mechanical speed of drilling.

9 dwg

Pcd diamond // 2522028

FIELD: process engineering.

SUBSTANCE: invention relates to PCD diamond to be used in production of water-jet ejectors, engraving cutters for intaglio, scribers, diamond cutters and scribing rollers. PCD diamond is produced by conversion and sintering of carbon material of graphite-like laminar structure at superhigh pressure of up to 12-25 GPa and 1800-2600°C without addition of sintering additive of catalyst. Note here that sintered diamond grains that make this PCD diamond feature size over 50 nm and less than 2500 nm and purity of 99% or higher. Diamond features grain diameter D90 making (grain mean size plus grain mean size × 0.9) or less and hardness of 100 GPa or higher.

EFFECT: diamond features laminar or fine-layer structure, ruled out uneven wear, decreased abrasion.

15 cl, 5 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to production of heat-resistant polycrystalline diamond composites for production of cutting elements. On the boundary of division on the substrate of ceramic material, metal or cermet applied is heat-resistant diamond plate, which contains a layer of first impregnating material, selected from VIII group of periodic system of chemical elements or eutectic composition of said elements and placed between lower surface of said heat-resistant diamond plate and upper surface of said substrate. Material of coating from boron nitride, graphite or aluminium oxide is applied on the surface of said diamond plate, except the surface on the boundary of division. After that, applied on each other heat-resistant diamond plate and substrate are subjected to thermal cycle, consisting of heating, temperature support and cooling, ensuring transition of, at least, part of said impregnating material into liquid state for migration into heat-resistant diamond plate and into said substrate in the area of the boundary of division for their connection to each other. Said first impregnating material is used in amount, ensuring, at least, 90% of its transition into material of said substrate and plate.

EFFECT: production of working elements of metal-processing instrument, external part of which possesses high hardness, with internal one possessing high shock viscosity, is ensured.

41 cl, 10 dwg

FIELD: metallurgy.

SUBSTANCE: there are used powders of super-hard materials of at least two granularities. Also, porous base of the element is made of powders of super-hard materials of higher granularity. Porous base is placed in a bath with suspension containing powders of small granularity and these powders are settled in pores of porous base with electric current transmitted through suspension, where upon all grains of super-hard material are bound with binding.

EFFECT: utilisation of powders of super-hard materials of small granularity including nano dimensions for fabrication of cutting elements with uniform distribution of grains in volume; reduced time of process.

4 cl

FIELD: metallurgy.

SUBSTANCE: it is prepared mixture of abrasive dust of coarse grain and, at least, of one fine grain, mixture of powders is compacted and impregnated by metals or alloys. In the capacity of powders, at least, of one fine grain there are used powders, surface of which fulfil wettability conditions by impregnating metals or alloys.

EFFECT: method provides increasing of working layer height of elements, and also receiving in the element defined content of abrasive grains for optimal external environment.

12 cl, 1 dwg, 5 ex

FIELD: technological processes.

SUBSTANCE: invention claims diamond tool manufactured with monocrystallic diamond, synthesised under high pressure by temperature gradient method, so that the claimed diamond crystal contains not more than 3 parts per million of nitrogen. The tool features a blade with its edge oriented in plane (110), so that Knoop scale hardness at the plane (100) in direction <110> is higher than in direction <100>. Such synthetic monocrystallic diamond is synthesised by temperature gradient method under superhigh pressure and high temperature, and its crystals contain nickel atoms introduced by atomic substitution or boron and nickel atoms introduced by atomic substitution.

EFFECT: obtaining cheap synthetic monocrystallic diamonds with reduced flaw number.

24 cl, 4 ex, 2 tbl, 7 dwg

Cutting plate // 2201846
The invention relates to the processing of materials by cutting, fine grinding

Diamond cutter // 2168396
The invention relates to the treatment of materials by cutting, in particular for diamond tool manufacturing amplitude diffraction gratings and similar products

The invention relates to a diamond sintered material, method of its production and cutting and drilling tool, which uses a diamond sintered material

FIELD: technological processes.

SUBSTANCE: invention claims diamond tool manufactured with monocrystallic diamond, synthesised under high pressure by temperature gradient method, so that the claimed diamond crystal contains not more than 3 parts per million of nitrogen. The tool features a blade with its edge oriented in plane (110), so that Knoop scale hardness at the plane (100) in direction <110> is higher than in direction <100>. Such synthetic monocrystallic diamond is synthesised by temperature gradient method under superhigh pressure and high temperature, and its crystals contain nickel atoms introduced by atomic substitution or boron and nickel atoms introduced by atomic substitution.

EFFECT: obtaining cheap synthetic monocrystallic diamonds with reduced flaw number.

24 cl, 4 ex, 2 tbl, 7 dwg

FIELD: metallurgy.

SUBSTANCE: it is prepared mixture of abrasive dust of coarse grain and, at least, of one fine grain, mixture of powders is compacted and impregnated by metals or alloys. In the capacity of powders, at least, of one fine grain there are used powders, surface of which fulfil wettability conditions by impregnating metals or alloys.

EFFECT: method provides increasing of working layer height of elements, and also receiving in the element defined content of abrasive grains for optimal external environment.

12 cl, 1 dwg, 5 ex

FIELD: metallurgy.

SUBSTANCE: there are used powders of super-hard materials of at least two granularities. Also, porous base of the element is made of powders of super-hard materials of higher granularity. Porous base is placed in a bath with suspension containing powders of small granularity and these powders are settled in pores of porous base with electric current transmitted through suspension, where upon all grains of super-hard material are bound with binding.

EFFECT: utilisation of powders of super-hard materials of small granularity including nano dimensions for fabrication of cutting elements with uniform distribution of grains in volume; reduced time of process.

4 cl

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