Device and method of titanium stretch forming

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly to metal billet stretch forming. Proposed method comprises arranging the billet in the case on female die surface, insulating electrically said biller, gripping the billet at its opposite ends, resistance heating of the billet to working temperature, displacing the billet and female die surface relative to each other at the biller working temperatures, and cooling the billet down.

EFFECT: uniform heating to minimise heat losses.

10 cl, 11 dwg

 

The technical field to which the invention relates.

The present invention relates to the forming of metal components, and in particular to the formation of hot-stretching and molding the drawing of titanium and its alloys.

Forming hood is a well-known method used for forming curved shapes in metal components by pre-drawing the preform to its yield point while it is forming in the matrix. This method is often used for the manufacture of large components made of aluminium or aluminium alloys, has a low cost of manufacture tools and excellent repeatability.

Titanium or titanium alloys have replaced aluminum in certain components, especially components for aerospace applications. The reasons for this include higher strength-to-weight ratio titanium, higher tensile strength and better metallurgical compatibility with composite materials.

However, there are difficulties in forming titanium exhaust hood at room temperature because its yield is very close to the limit of the tensile strength with a minimum percentage elongation.

Therefore, the components of titanium usually are formed by forging and machining of large workpieces, which is on ragetotem and time-consuming method.

In this regard, there is a need for a device and method of molding with extraction of titanium and its alloys.

The invention

Accordingly, the aim of the invention is to provide a method of molding with extraction and/or forming by drawing of titanium at elevated temperatures.

Another objective of the invention is to provide a device for molding with extraction and/or forming by drawing of titanium at elevated temperatures.

Another objective of the invention is to provide a device for isolation of the workpiece during the forming process.

These and other objectives are achieved by this invention which, according to one aspect of the invention provides a method of extrusion, comprising: providing an elongated metal workpiece having a given non-rectangular cross-sectional profile, providing a matrix having a working surface, complementary to the cross-sectional profile, with at least the working surface contains a thermally insulating material; resistive heating of the workpiece to the working temperature by passing an electric current through it; the shaping of the workpiece on the working surface by moving the workpiece and the plates relative to each other, when the workpiece is at operating temperature, thereby providing plastic is dlinnie and the bending of the workpiece and its profile with the specified end form.

According to another aspect of the invention, the workpiece contains titanium.

According to another aspect of the invention, the cross sectional profile has a relative elongation of less than about 20.

According to another aspect of the invention, the cross-sectional profile formed by a method selected from the group consisting of: extrusion, molding by bending pressing, molding, rolling and machining, and combinations thereof.

According to another aspect of the invention, the method includes the step of placing the opposite ends of the workpiece in the clamping device for molding.

According to another aspect of the invention, the method includes the step of passing an electric current to the workpiece through the clamps.

According to another aspect of the invention, the clips are installed on the movable swivel arm, and the step of forming the workpiece includes moving the rotary levers to wrap the blank around the working surface.

According to another aspect of the invention, the method includes the step of regulating an operating temperature during execution of the molding.

According to another aspect of the invention, the method includes the step of forming the blank by drawing through the maintenance of a molded workpiece on the working surface and under controlled temperature for a specified time.

With the according to another aspect of the invention, the method includes the step of surrounding matrix and the first part of the billet grille.

According to another aspect of the invention, the casing includes an opening for providing the protrusion of the second part of the casing during the execution of the forming stage.

According to another aspect of the invention, a device for forming an exhaust hood includes: a matrix having a working surface with a given non-rectangular profile cross-section, performed with the possibility of placing and forming an elongated metal workpiece, with at least the working surface contains a heat-insulating material; heating means for electrical resistive heating of the workpiece to the working temperature; and means for moving to move the die and workpiece relative to each other to ensure the elongation and bending of the workpiece on the working surface.

According to another aspect of the invention, the matrix consists essentially of a ceramic material.

According to another aspect of the invention, the device further comprises opposing clamps to accommodate the opposite ends of the workpiece.

According to another aspect of the invention, the heating means includes an electrical power source electrically connected with the terminals; and an electrical connection between the clamps and just vcoi.

According to another aspect of the invention, the clips are installed on the moving rotary levers performed with the possibility of wrapping the blank around the working surface.

According to another aspect of the invention, the device further comprises a means of temperature control for regulating the operating temperature during the execution of the molding.

According to another aspect of the invention, the device forming further comprises means for maintaining a formed workpiece on the working surface at the operating temperature within a specified time.

According to another aspect of the invention, the device further comprises a casing surrounding matrix and the first portion of the workpiece with cover.

According to another aspect of the invention, the casing includes output means for providing the protrusion of the second part with the cover.

According to another aspect of the invention, a device for forming an exhaust hood includes: a matrix having a working surface made with the possibility of placing and forming an elongated metal workpiece, with at least the working surface contains a heat-insulating material; heating means for electrical resistive heating of the workpiece to the working temperature; the casing is made with the possibility of OCD is the position matrix and the first part of the elongated workpiece during the operation of molding and additionally providing the protrusion of the second side of the workpiece; and means for moving to move the die and workpiece relative to each other to ensure the elongation and bending of the workpiece on the working surface.

According to another aspect of the invention, the casing includes a first door configured to move between an open position to provide accommodation billet in the casing and a closed position.

According to another aspect of the invention, the casing includes at least one side wall that includes an opening therein for providing movement of the outer end portion of the workpiece relative to the shell.

According to another aspect of the invention, the device further comprises a movable door, which essentially closes the side opening of the wall, when the door has an opening for procurement, designed to ensure the passage of the workpiece through it, the opening for the workpiece substantially less than the side holes.

According to another aspect of the invention, the housing contains a box like structure having top and bottom walls, front and back walls, opposite side walls and a door at one side, is arranged to move between an open position and a closed position.

Brief description of drawings

For a better understanding of the invention below it is the Scripture with reference to the accompanying drawings, on which:

figure 1 is a perspective view of an exemplary embodiment of a device for molding hood, according to the present invention;

figure 2 is a top view in section of the node terminals of the device for molding hood, according to figure 1;

figure 3 is a perspective view of the casing of the matrix, which forms part of the device shown in figure 1, with its door in an open position;

figure 4 is a view in section of the casing shown in figure 3, depicting its internal structure;

figure 5 is a top view of the casing of the matrix, according to figure 3;

6 is a view with spatial diversity elements of the housing of the matrix with the image of the design of its side door;

Fig.7 is a perspective view of the device forming with the hood shown in figure 1, with loaded and ready for the molding blank;

Fig is a perspective view of the device forming hood with fully molded blank;

figa is a block diagram of an example implementation of the method of molding using a device for molding hood;

FIGU is a continuation of the flowchart on figa; and

figure 10 is an end view of the workpiece shown in figure 1.

The detail is the first description of the invention

In the drawings the same positions denoted by the same elements in the various views, figure 1 is shown as an example of a device 10 for forming with the hood according to the present invention, together with examples of the implementation of the workpiece W. As shown in figure 10, the workpiece W is obtained by extrusion with L-shaped cross-sectional profile.

The present invention is suitable for use with workpieces of various types, including, but not limited to, rolling flat or fittings, bars, molded lentiginosis pressing profiles, extruded profiles obtained in the processing machine profiles, etc. of the Present invention is particularly suitable for workpieces with non-rectangular cross-section profiles, and for workpieces with cross-section profiles with a relative elongation of about 20 or less. As shown in figure 10, the elongation is the ratio of the lengths L1 and L2 of rectangular boxes surrounding the outer dimensions of the cross-sectional profile.

The device 10 includes an essentially rigid main frame 12, which forms a mounting surface 14 of the matrix and serves as a support for the major working components of the device 10. First and second opposing pivot arms 16A and 16B are installed with the possibility of rotation n of the main frame 12 and is connected to the hydraulic moulding cylinders 18A and 18B, respectively. Swing arms 16A and 16B are hydraulic tensioning cylinders 20A and 20B, which, in turn, are driven hydraulically into the clamping action nodes 22A and 22B mounted on them. Tensioning cylinder 20 is configured to attach to the steering levers 16 with a fixed orientation, or they may be rotatable relative to the rotary lever 16 about the vertical axis. The casing 24 of the matrix, detailed description of which will be described below, is installed on the installation surface 14 of the matrix between the clamping nodes 22A and 22B.

Provided with appropriate pumps, valves and control components (not shown) for supplying compressed hydraulic fluid in the moulding cylinders 18, the tensioning cylinders 20 and clamping the nodes 22. Alternatively, the above hydraulic components can be replaced by other types of actuators, such as electrical and Electromechanical devices. Management and programming of the device 10 can be manual or automatic, for example, by using a computer such as a PLC or PC.

The principles of the present invention are also suitable for use with devices for molding hood all other types, in which the workpiece and the matrix are moved relative to each other to create a form action. Known types of such condition is of devices for molding can be fixed and movable matrix and can be oriented horizontally or vertically.

Figure 2 shows the design of the clamping unit 22A, which is also another clamping node 22B. The clamping node 22A includes spaced apart clamps 26, is configured to capture one end of the workpiece W and installed between having the form of a wedge clamping sleeve 28, which are disposed inside the annular frame 30. Hydraulic cylinder 32 is designed for the application of axial force to the terminals 26 and clamping sleeves 28, which leads to tight clamping with clamping sleeves and clamps 26 of the workpiece W. the Clamping node 22A or most of electrically isolated from the workpiece W. This can be done by applying an insulating layer or coating, such as coating of an oxide type, the clips 26, the clamping sleeve 28, or both. If the coating is applied to all the clips 26, including the end surface, the clamping node 22A will be completely isolated. If it is desirable to bring the heating current through the terminals 26, their end surfaces 36 are left uncoated, and they are supplied with appropriate electrical connections. Alternatively, the clamps 26 and clamping sleeve 28 can be made of insulating material, as described below in relation to the matrix 58, such as a ceramic material. The clamps 26 and clamping sleeve 28 can be mustache is the Plac CE using insulation fasteners 59 to exclude any of the ways of electric and heat leakage into the rest of the clamping unit 22A.

As shown in Fig.3-5, the casing 24 of the matrix is a box like structure having top and bottom walls 38 and 40, rear wall 42, side walls 44A and B and the front door 46, which can be rotated from the open position shown in figure 2, in the closed position. The specific shape and dimensions can, of course, vary depending on the size and proportions to be molded workpiece. The casing 24 of the matrix is made from a material, such as steel, and is designed in General to minimize air leakage and thermal radiation from the workpiece W. the Casing 24 of the matrix may be insulated if necessary.

Matrix 58 is located inside the casing 24 of the matrix. Matrix 58 is a relatively massive body with a working surface 60, which is shaped to impart to the workpiece W of a given curve or profile when it is bent around the matrix 58. The cross-section of the working surface 60 generally corresponds to the cross-sectional shape of the workpiece W and may include a recess 52 to accommodate the protruding parts of the workpiece W, such as flanges or guide bars. If necessary, the matrix 58 or its part can be heated. For example, the working surface 62 of the matrix 58 may be made of a layer of steel or other heat-conducting material, which can be designed for electrical resist the main heating.

Figure 6 illustrates in greater detail one of the side walls 44A, which is also another side wall W. The side wall 44A includes a fixed panel 48A, which forms a relatively large side opening 50A. Side door 52A mounted on the stationary panel 48A, for example, by means of Z-shaped brackets 54A, so that it can slide forward and backward together with the workpiece W during the molding process while maintaining tight contact with the fixed panel 48A. Side door 52A has made in her hole 56 for procurement, which is substantially less than the side holes 50A and in the ideal case is just large enough to ensure the passage through it of the workpiece W. the Side walls 44 may be replaced by other structures capable of moving the ends of the workpiece while minimizing the aperture of the workpiece, without violating the basic principle of the casing 24 of the matrix.

During the operation of molding the hood of the workpiece W is heated to a temperature of about 538°C (1000°F) or above. Therefore, the matrix 58 is made from a material or combination of materials that are thermally insulated. Key characteristics of these materials are that they provide resistance to heat caused by contact with the workpiece W, retain dimensional stability ol the high temperatures and minimize the transfer of heat from the workpiece W. It is also preferred that the matrix 58 is an electric insulator, so that the current of the resistive heating does not leak from the workpiece W in the matrix 58. In the example implementation matrix 58 is made of several parts of ceramic material such as fused silica. Matrix 58 may also be made of other refractory materials, or from reisolation materials, which are then covered or enclosed in the insulating layer.

Because the workpiece W is electrically isolated from the device 10 for molding hood, the workpiece W can be heated by electrical resistive heating. The connecting element 64 (7) from the current source can be placed at each end of the workpiece W. alternatively, the supply of the heating current can be made directly through the clamp 26, as mentioned above. Through the use of thermocouples or other temperature sensors (not shown) can be controlled current source using the computer using the temperature signal feedback. This ensures the correct speed for rapid but uniform heating, and also provides a delay current after reaching the workpiece W set temperature. May provide PID control circuit of a known type to ensure the machine is economic regulation of temperature changes during the molding cycle. Management can be active and programmable during the molding cycle.

Below is a description of an exemplary embodiment of the molding process using a device 10 for forming hood with links 7 and 8 and the block diagram shown in figa and 9B. First, at step 68, the workpiece W is loaded into the casing 24 of the matrix, while its ends protrude from the holes 56 for procurement, and close the front door 46. Side door 52 are in their most forward position. This state is shown in Fig.7. As mentioned above, the process is particularly suitable for workpieces W which is made of titanium or its alloys. However, it can also be used with other materials when you need hot molding. Certain profiles billets require a flexible supporting parts or "frame" to prevent distortion of the cross-section of the preform during the molding cycle. In this application, the frames must be made of flexible high temperature insulation materials, where practicable. If necessary, the frames may be made from being heated to high temperatures materials to avoid heat loss from the workpiece W.

Any connection with thermocouples or more feedback devices for the management system are performed at the time of this stage. When the workpiece within the enclosure 24 of the matrix of its ends placed in the clamps 26, and the clamp 26 is closed at step 70. If you must use a separate electrical heating connections 64, they are attached to the workpiece W with the use of conducting heat and electricity paste necessary to ensure good contact.

At steps 72 and 74 with the feedback through the workpiece W is passed the current that causes it to resistive heating. Controlled heating of the closed contour of the workpiece W continue using feedback from thermocouples or other temperature sensors, until it reaches the set operating temperature. The rate of heating the workpiece to a predetermined temperature is determined with reference to the cross-section and its length, as well as feedback from thermocouple.

After reaching operating temperature, you can start molding the preform. Before reaching the predetermined temperature, continuing the heating of the workpiece W in a closed loop.

At steps 76 and 78 with feedback cylinders 20 tension pull the workpiece W in the longitudinal direction to the desired point, and the main cylinder 18 rotates swing arms 16 inside to wrap the workpiece W around the matrix 58 while managing operating temperature. Side door 52 slide back to agreed upon is I move the ends of the workpiece. This state is shown in Fig.6. Speed drawing, the exposure time in different positions and temperature changes can be controlled through a feedback control system during the molding process. As soon as the feedback position from the rotary levers 16 indicates that the workpiece W has reached its end position, the control stores the position and/or tension force, while the workpiece W is ready for retrieval. Before reaching the set point the control system continues the heating and forming of the workpiece W around the matrix. Forming a drawing can be performed by holding the workpiece W on the matrix 58 within a specified period of time while simultaneously the desired temperature control.

At steps 80 and 82 with feedback provide cooling of the workpiece W with a velocity less than the velocity of natural cooling by supplying additional heat from the power source. This speed reduction temperature programmed and provides cooling of the workpiece W while controlling the temperature by means of feedback.

After reaching the final temperature set point efforts from the workpiece W is removed, and stops the supply of current from the current source. Before reaching the end of the set point control system save is no heating in the closed circuit for cooling the workpiece W at a given speed.

After removal efforts from the workpiece W clamps 26 can open and remove the electrical connections (step 84).

After opening the clamps 26 and remove the electrical connections 64, you can open the casing 24 of the matrix and remove the workpiece W. thereafter, the workpiece W is ready for further processing steps, such as machining, heat treatment, etc.

The above process provides the advantages of forming hood molding drawing, including inexpensive tool and good repeatability that can be achieved with titanium components. This significantly reduces the time and cost compared with other methods of forming titanium parts. In addition, isolation of the workpiece from the outer environment promotes uniform heating and to minimize heat loss to the environment, which reduces overall energy demand. In addition, the use of casing 24 of the matrix increases security by protecting workers from contact with the workpiece W during the cycle.

Above was the description of device and method of molding with extraction of titanium. Various details of the invention can be modified without going beyond its scope. In addition, the above description of the preferred variant of the invention and the best mode of carrying out the invention are given only for illustration and not for the purpose of Ogre is icene.

1. Method of molding hood metal blank, including
(a) providing a heat-insulating casing, which includes opposite spaced side walls with holes in them for the workpiece located between the walls of a matrix having a working surface with a predetermined cross-sectional profile to accommodate the workpiece;
(b) providing opposing clamps installed on the respective first and second opposite rotary levers;
(c) placing the workpiece in the casing on the working surface of the matrix, while its opposite ends are passed through corresponding holes in the side walls of the casing;
(d) electrical isolation of the workpiece;
(e) gripping the workpiece in the clamp at its opposite ends;
(f) resistive heating of the workpiece to the working temperature by passing an electric current through it;
(g) moving the workpiece and the working surface of the die relative to each other, when the workpiece is at operating temperature, thereby shaping the workpiece on the working surface of the matrix with the specified form; and
(h) cooling the workpiece, when she has a predefined shape on the working surface of the matrix.

2. The method according to claim 1, including the step of resistive heating of the workpiece by passing electrical current to the workpiece across the terminals.

3. The method according to claim 1, including the step the electrical isolation matrix from passing an electric current from the workpiece to the matrix.

4. The method according to claim 3, in which the matrix is electrically isolated from the preparation of ceramic material.

5. The method according to claim 1, including the step of providing a sliding side door in each of the spaced walls of the casing, while in the corresponding sliding side doors with holes for a workpiece having a size and shape that provides accommodation billet in them, and sliding side door is configured to move along the walls of the casing during the molding of the preform to reduce heat loss.

6. The method according to claim 1, in which the casing is still installed on essentially rigid main frame forming an installation surface of the matrix, and the opposing swing arms mounted to rotate on the main frame and connected to respective hydraulic molding cylinders, which regulate the movements of the swivel levers.

7. The method according to claim 1, including the step the electrical isolation clips from the workpiece by applying an insulating layer on portions of the terminals which are in contact with the workpiece.

8. The method according to claim 1, comprising the steps of determining, by a position feedback from the rotary levers that zagotovka who has reached the end position of the molding, maintain the final position of the molding until the workpiece reaches a specified point extraction, and continue heating and molding blanks around the matrix until the desired point of retrieval.

9. Method of molding hood metal blank, including
(a) providing a heat-insulating casing, which includes opposite spaced side walls with holes in them for the workpiece located between the walls of a matrix having a working surface with a predetermined cross-sectional profile to accommodate the workpiece;
(b) providing a sliding side door in each of the spaced walls of the casing, while in the corresponding sliding side doors with holes for a workpiece having a size and shape that provides accommodation billet in them, and sliding side door is configured to move along the walls of the casing during the molding of the preform to reduce heat loss;
(c) providing opposing clamps installed on the respective first and second opposite rotary levers;
(d) placing the workpiece in the casing on the working surface of the matrix, while its opposite ends are passed through corresponding holes in the side walls of the casing;
(e) electrical isolation matrix from proch the input voltage to the electric current from the workpiece to the matrix by means of a ceramic material;
(f) gripping the workpiece in the clamp at its opposite ends;
(g) resistive heating of the workpiece to the working temperature by passing an electric current through the clamps to the workpiece; and
(h) moving the workpiece and the working surface of the die relative to each other, when the workpiece is at operating temperature, thereby shaping the workpiece on the working surface of the matrix with the specified form.

10. The method according to claim 9, further comprising the step of forming the blank by drawing through
(a) determining, by a position feedback from the rotary levers that the workpiece has reached the end position of the molding;
(b) maintain the final position of the molding until the workpiece reaches a specified point extraction,
(c) continuing heating and molding blanks around the matrix until the desired point of extraction; and
(d) cooling the workpiece, when she has a predefined shape on the working surface of the matrix.



 

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SUBSTANCE: invention refers to metal forming operations and is designed for implementation at production of parts of rail brace clamp type out of rods. A work-piece by one is supplied into the zone of stamp bending, is transferred to a bend working position, and is fixed in a punch. Further the work-piece is successively preliminary double-side bent in the first working position, is transferred into the second working position of the punch and is finally bent in die impressions formed with movable and fixed mandrels-templates and with bending working components. When the work-piece is fixed in the first working position of the punch, it is pushed into a slit of a movable cylinder mandrel to the middle of the work-piece. Further the central part of the work-piece is bent by pushing it with the cylinder mandrel between rollers till there is formed a "П"-shape of the work-piece. Sides of the work-piece are bent along the shape of the mandrel, whereupon the work-piece is removed from the mandrel, is fixed in the second working position of the punch enveloping a mandrel-tooth with a middle part of the work-piece. "П"-shape of the work-piece is bent by turning the middle part to its ends in a plane perpendicular to the plane of the work-piece of "П"-shape produced after bend in the first working position of the punch. Also the second work-piece is loaded and fixed in the first working position of the punch simultaneously with final bend of the work-piece in the second working position.

EFFECT: expanded process functionality, raised process efficiency.

17 dwg

FIELD: technological processes.

SUBSTANCE: invention relates to the field of metal deformation process, namely to processes of bending shapes of various section in cold condition and may be used in various industries. Device comprises hollow shaft and two flat rings, detachable support connected to shaft and at least one replaceable limiter of shape axial size, which is installed on shaft. At the same time one ring is arranged coaxially to shaft and is rigidly connected to it or arranged with it as a whole. Another ring is arranged as replaceable with a hub and is installed on shaft to arrange a working stream with the first and last ring for shape placement, besides limiter is installed between hub and rest.

EFFECT: technological resources are expanded, and design is simplified.

4 cl, 6 dwg

FIELD: machine building.

SUBSTANCE: invention relates to machine building, particularly to metal deformation process and can be used at manufacturing of heat exchanging electric power installations. Ribbed monometallic or bimetallic pipe is installed on section of the left and the right clips, and is rigidly fixed by external diametre ribs in grooves, allowing mirror pitch of ribbed pipe. Then on pipe on section of bending it is operated by radial axial force of compaction, applied to the right and to the left clips, herewith pipe is held from movement to the side of center of bend curvature by means of initial upset of pipe by compaction effort, providing to the flexible element no-load state up to beginning of bending of ribbed pipe.

EFFECT: there is increased quality.

5 cl, 5 dwg

FIELD: technological processes, metal working.

SUBSTANCE: invention is related to plastic metal working and may be used for bending of shaped tubes. Billet is bent successively by sections in bending device. Besides, prior to bending, two opposite sides of billet are rolled inside to specified depth and configuration. Then its bend end is flattened along unrolled sides, is inserted into bending device slot, and bending is carried out by unrolled sides. For bending device is used that comprises template with working surface and slot for billet installation, auxiliary templates with working surfaces, bending element on axis. Template is fixed on faceplate having openings for serial installation of auxiliary templates one after another. Bending element is fixed relative to axis against rotation by fixator and is installed above faceplate with the possibility of plank adjustment in longitudinal direction in guide fixed on bed plate. Puncheon-fixator is mounted into wall of template groove with sharp edge for billet fixation.

EFFECT: higher efficiency and quality of produced items.

2 cl, 18 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: invention relates to metal pressure working technologies and is intended for implementation in metallurgy. Primarily one performs mandrel bending of two loops on the blank end sections by way of having the bar rolled with rollers moving along curvilinear trajectories. Subsequently the blank is bent in the same direction to produce a third loop. Two blanks in two positions are bent simultaneously. In the first and the second positions accordingly the two primary loops and the third loops are produced. During the interval between two successive bending operations the blank with two loops becomes shifted from Position 1 to Position 2 along the mandrels which process is accompanied by simultaneous relocation of the finished item.

EFFECT: provision for high endurance of stamp.

5 cl, 6 dwg, 1 ex

FIELD: metallurgy.

SUBSTANCE: pass sequence contains matches of gauged horizontal rollers and dead vertical rollers, installed after each forming cage, and includes three two-high and one four-roll gauge. Stock tubes allows outer diametre D. Holes in rollers of the first gauge are implemented by circles of radius R1=(0.495…0.50)·D. In the second and the third gauges holes are implemented as trapeziform, with lateral minor surfaces of the same radiuses, with major surface of the second gauge of radius R2=1.6·D and similar surface of the third gauge with R3=3.2·D. Breakout height of gauges into rollers is appropriately: H1=(0.44…0.46)·D, H2=(0.38…0.40)·D and H3=(0.39…0.41)·D. Vertical rollers behind the first cage allows labor concave with radius r1=R1 behind the second cage - with r2=R2 and behind the third cage - with r3=R3 fourth finishing gage of system can be implemented with ability of dimensions changing by means of rearrangement in overall axial plane three rollers which are components of gauge.

EFFECT: invention provides receiving of thin-walled tube of square cross-section from round stock tube for minimum pass number.

2 cl, 1 ex, 2 dwg

Tube bending device // 2353455

FIELD: engineering industry.

SUBSTANCE: invention refers to engineering industry, and namely to tube bending devices. The latter consist of a body on the axis of which there fixed is a disk-shaped bending template on some part of circular periphery of which is located the operating surface for tube bending, which is radial in cross section. On bending template there installed with the possibility of being moved is the fixing element of the tube subject to bending. Device consists of a lever mounted so that it can be turned relative to the above axis of the body with freely rotating rolling roller located thereon with operating surface that is made in the cross section with radius equal to that of cross section of bending template operating surface. Bending template operating surface is provided with the second operating surface located along middle part thereof, which has cross section with radius that is smaller than that of cross section of the above first operating surface, and the second operating surface is made with the third operating surface having cross section with radius that is smaller than that of cross section of the above second operating surface. The Rolling roller is replaceable for each operating surface of bending template. The Lever is provided with holes used for installation of axis with the appropriate roller.

EFFECT: providing the possibility of bending tubes of various diameters.

7 dwg

FIELD: machine building.

SUBSTANCE: invention is related to machine building and may be used for sectional bars bending by rollers. Bending device for bending of closed, semi-opened and opened hollow sectional bars comprises central roller for adjacency to internal side of bent sectional bar, expanding roller for adjacency to external side of bending, bending roller for location on the side of sectional bar rise and effect at external side of bending, opposite to which support rollers are installed, expanding rollers that are located opposite to each other in plane that is perpendicular to plane of bending for effect at upper and lower lateral walls of sectional bar arranged with possibility of swinging, and holder for sectional bar placement. Expanding rollers are arranged with the possibility to direct material flow that occurs in external end wall of sectional bar bending, through appropriate lateral walls into internal end wall of sectional bar bending.

EFFECT: provides optimal deformation of sectional bar without disruption of material continuity.

25 cl, 12 dwg

FIELD: technological processes.

SUBSTANCE: tubular billet is installed with the possibility of its rotation by rotary-thrust mechanism, which is included in composition of technological complex for production of corrugated pipes. Alternate local heating of billet is performed in the area of every flute production. For that purpose device is used with at least one annular inductor. Width of inductor makes 0.5...1.0 of pipe flute pitch value. In order to make flutes of larger depth, inductor is used with larger width. Every flute is formed by rolling and further calibration of its cavity, which is performed by profiled roller of flute-rolling mechanism. During rolling together with billet bending it is settled along its longitudinal axis by means of pressing mechanism.

EFFECT: efficiency is increased as well as manufacturability of corrugated pipes production, power intensity and laboriousness are reduced with simultaneous increase of ecological compatibility and quality of manufactured products.

30 cl, 7 dwg, 1 tbl

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