Method for joining by rolling liquid and solid different type metals and plant for performing the same

FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.

SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.

EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.

14 cl, 6 dwg, 3 ex

 

The technical field to which the invention relates.

The present invention relates to a method and installation for connecting rolling dissimilar metals, in particular to a method and installation for connection of rolling liquid and solid dissimilar metals.

Background of invention

Clad metal sheets are a new type of material made by joining two or more dissimilar metals under high temperature and high pressure. Depending on the specific requirements of such a clad metal sheet can combine the advantages of each of its components. Clad metal sheet has many advantages such as low cost and high processability, high mechanical, physical and chemical structural properties, including high strength, high wear resistance, high corrosion resistance, etc. Having such properties clad sheet metal is widely used in construction and machinery, for the manufacture of various utensils, furniture, chemical industry, as a finishing material in automotive, aerospace and aviation industry, and for other purposes.

Currently, there are five basic methods of making the Plaka is avannah metal sheets, namely, the compound roll of dissimilar metals, the compound roll of dissimilar metals, one of which is in powder form, the connection of dissimilar metals in the explosion, foundry cladding and the application of one of the metal spray coating of another metal.

Join rolling dissimilar metals, which is currently the most common method of making clad metal sheets, essentially combines two different ways, one of which is based on hot rolling, and the other, described in the patent US 3545943 - cold rolling. The choice of method depends on physical contact new surfaces formed by the stretching of the metal during rolling, the first stage of which the drawing ratio must be sufficiently high (typically above 50%). Join rolling dissimilar metals requires the creation of a powerful rolling mills with a large load capacity and is associated with fulfillment of accompanying the process of rolling annealing, ensuring the formation of a metallurgical connection between the joined metals. However, the strength of the connection remains quite low. In recent years we have developed such ways of connecting dissimilar metals rolling, as the connection with the continuous the main rolling, connection in asynchronous rolling and join rolling of metals with different temperatures. In this case, however, are not fully solved problems such as the need for high capital investment, high energy consumption and high cost of the final product.

In patents JPJ 8667705 A (1984), JAJ 54124804 (1981), JAJ 8021518 (1984) and in the patent US 4308321 (1981) described a method of connection by rolling dissimilar metals, one of which is in powder form. When implementing this method, a metal powder dispersed on the surface of a solid metal, then the metal is sintered in a protective atmosphere and rolled, getting in the clad sheet metal. The disadvantage of this method is its technological complexity, the length of the production line and high energy consumption. This method is suitable only for the manufacture of some special clad with metal sheets, such as the clad strips of copper-lead alloy bearing steel.

The Bradgessky in Explosion Meld Forming and Compression", translated Fule Li, Izd-vo Mechanical Industry Press, 1988, P78) proposed a method for joining metals using a Bang. This method is based on the use of jets formed during the explosion, to clean the surface with simultaneous use for metal compounds occur when the explosion of the impact force and high temperature. Offered at Bradgessky method is simple and economical. However, it can only be used for the manufacture of thick clad with metal sheets. In addition, it is associated with major problems from the point of view of security and may not be implemented as a continuous process.

In the patent US 3495649 (1970) described a method of casting cladding sheets of metal. When implementing this method, molten metal is poured on the surface of the solid base metal, thereby creating a metallurgical bond between them. This method is relatively simple and can be used to produce billets and individual parts. However, to the manufacture of blanks finished parts procurement must be properly processed because the surface of the base metal susceptible to oxidation. In addition, the resulting products have a low bonding strength of the dissimilar metals due to the high residual stresses at the interface. The disadvantage of this method is the high cost of finished products.

In patents US 4333775 (1982), GB 159861 (1977), JAJ 8019522 (1978) and DT 2928317 (1978) described a method of manufacturing clad metal sheets with the application of one of the metal spray coating of another metal. In the implementation this is way hot molten alloy metal is applied using a spray gun on a solid steel sheet. The advantage of this method is the lack of separation of the alloy components due to rapid cooling of the molten metal when it is sprayed. The possibility of oxidation of the molten metal spraying is a cause of low strength metal compounds manufactured in such a way blokirovannom sheet. In addition, this method requires the use of complex equipment, and the relatively high capital investment.

Thus, for solving the main problems limiting the use of clad metal, it is necessary to develop more economical and efficient, and technologically more simple in comparison with the known method of making clad metal.

The objective of the invention

The present invention was based on the objective to develop a method of connecting a rolling liquid and solid dissimilar metals, which was devoid of the disadvantages inherent in the known methods, would produce a clad metal sheet with high strength connection of dissimilar metals and different technological simplicity and high efficiency.

Another objective of the present invention to provide an installation for implementing the above method of the connection rolling liquid and solid heterogeneous meta is fishing.

Summary of the invention

In the present invention proposes a method of connection by rolling liquid and solid dissimilar metals and installation for carrying out the method. Proposed in the invention method is that the surface of the solid base metal, coated with flux for brazing, poured another molten (liquid) metal and both metal laminates under pressure in conditions of rapid cooling, contributing to the solidification of the molten metal and its strong connection with the surface of the solid base metal. Proposed in the present invention the method provides, thus obtaining a metallurgical connection between two or more of the joined metals.

In the present invention it is also proposed installation for implementing the method according to the invention. This setting is intended for carrying out the invention method, is located in the appropriate order machine for bending sheet metal from a roll, a container of flux for soldering, hot air oven heated, filling a glass, rollers with internal water cooling and machine for winding into a roll of sheet metal. Over the pouring nozzle is a ladle for molten metal, and under it is the main frame of the installation.

the quick description of the drawings

Attached to the description of the drawings shows:

figure 1 - flow chart proposed in this invention method,

figure 2 - scheme used in the implementation of the present invention installed for cleaning and sandblasting the surface of the metal,

figure 3 - scheme proposed in the present invention, the setting for connecting rolling dissimilar metals

figure 4 - schematic representation of construction of the filling of the glass used in the installation according to Fig 3,

figure 5 - image in the direction of the arrow shown in figure 4 And one side of the filler glass placed therein clamping blocks and

figure 6 - the image in the direction of the arrow shown in figure 4 And one side of the pouring Cup with another alternative locations available clamping blocks.

Detailed description of the invention

In accordance with one of the objects of the present invention it is proposed a method of connection by rolling liquid and solid dissimilar metals. Proposed in the invention method is that the coated flux for soldering surface of the solid metal is poured another molten metal, these metal laminates under pressure and rolled metal is rapidly cooled, resulting in at least solidification and connection location is ablanovo metal with the surface of the solid base metal forms a metallurgical bond between two or more of the joined metals.

Figure 1 shows a process scheme proposed in the present invention method. In accordance with the scheme proposed in the invention is a method of connecting a rolling liquid and solid dissimilar metals is that:

1) perform the clear operation, during which the surface of the solid base metal is cleaned from oil stains and other substances pollute it,

2) perform the sandblasting operation, during which the surface of the solid base metal by sand blast to remove various oxides,

3) perform an operation of applying to the surface of the flux for soldering, during which the surface of the base metal after cleaning and processing of sand, put a layer of flux for soldering,

4) perform the heating operation, during which the solid base metal with a coating of a flux for soldering is heated to a certain temperature and then moved to a pouring Cup,

5) perform the operation of casting and metal compounds rolling, during which the melted liquid cladding metal and pour the molten cladding metal in the pouring ladle, after which molten metal is poured on the surface of the moving solid base metal, roaming through the nozzle, which has a clamping blocks and the hole to fill it races Lavrenova metal, which, getting covered with a layer of a flux for soldering surface of the solid base metal, wets it, solid base metal with spilled on the surface of the liquid metal is moved into the gap between the two rollers with the inner-cooled and liquid metal cooled in the rolling process in the gap between the two rollers forming a metallurgical bond between liquid and solid dissimilar metals, which results in clad sheet metal.

In the implementation proposed in the present invention a method of cleaning a solid metal perform the usual well known in the art. The scheme used in the present invention, the installation for cleaning, including sandblasting, the surface of the solid base metal is shown in figure 2. The setup scheme is shown in figure 2, the solid base metal is first passed through a degreasing tank 2, in which the surface to remove oil stains, and then washed in the washing tank 4. With a strong oxidation of the surface of the solid base metal it should be washed in acid, conceding to do this (after surgery (1) cleaning) through the pickling tank 5 with subsequent washing in the washing tank 6. In other words, the presence in the plant for cleaning, including sandblasting, surface is STI solid base metal, the scheme is shown in figure 2, pickling tank 5 and the washing tank 6 is not required.

To connect liquid and solid dissimilar metals rolling surface of the solid metal you need to remove the oxides. For complete removal of oxides from the surface of the solid base metal in the proposed in the present invention the method is used intended for these purposes unit for cleaning, including sandblasting, whose schema is shown in figure 2.

In the implementation proposed in this invention method during execution of the operation (5) in the nozzle is filled with liquid (molten) metal obtained in the melting furnace after removal from the air and slag. A method of obtaining a molten metal is well known to specialists in this field.

In the implementation proposed in the present invention a method you can use different fluxes for soldering, the choice of which depends on the properties of the base metal (hard metal) and forming thereon a cladding layer and connected to it material (molten metal). Usually for this purpose, as proposed in the invention method, as a flux for soldering use aqueous solutions of salts and salt melts.

As the water flux for soldering in the exercise room is imago in the present invention the method may be used an aqueous solution of a compound salt, containing KF, NaF, KI, Nal and LiI. This compound salt contains 15-25 wt.% KF, 15-25 wt.% NaF, 15-25 wt.% KI, 15-25 wt.% Nal and 15-25 wt.% LiI. Preferably it contains 20 wt.% KF, 20 wt.% NaF, 20 wt.% KI, 20 wt.% Nal and 20 wt.% LiI. In water flux for soldering the number of composite salt in mass percent is usually from 6 to 12%, preferably from 8 to 10%.

The composition of the salt melt in the proposed in the present invention method can also be used as a flux for soldering, includes boric acid (60-85 wt.%), borax (10-20 wt.%) and aluminum phosphate (3-6 wt.%). Preferably the composite molten salt used in the present invention contains 70-80 wt.% boric acid, 13-18 wt.% borax and 4-5 wt.% phosphate of aluminum. In the most preferred embodiment, the composite molten salt used in the present invention, contains 80 wt.% boric acid, 16 wt.% borax and 4 wt.% phosphate of aluminum.

In accordance with another object of the present invention it is proposed to install for connection of rolling liquid and solid dissimilar metals. This scheme is shown in figure 3, consists of a set in a specific order machine 11 for bending sheet metal from a roll, the container 13 with a flux for soldering, drying unit 15 is heated, filling cups 17 and roller 18 with internal water cooling machine and 20 DL is wound into a roll of sheet metal. Over the pouring nozzle 17 is the bucket 16 for molten metal, and under it is the main frame 21 of the installation. The drying unit 15 is heated from a low temperature drying oven 15A and high-temperature drying ovens 15V.

Used in the installation for connecting rolling liquid and solid dissimilar metals the nozzle 17 shown in figure 4 and 5, is a hollow element with an internal channel having a pressure side wall 173, heating elements 172 and several clamping blocks 174, located on its inner surface 171.

In the proposed in the present invention is installed to connect the rolling liquid and solid dissimilar metals in the structure shown in figure 2 installation for cleaning, including sandblasting, are located in the appropriate order machine 1 for bending sheet metal from a roll, a degreasing tank 2, the washing tank 4, the drying furnace 7, sandblasting unit 8 and the machine 9 for winding the sheet metal in rolls.

In the proposed in the present invention is installed to connect the rolling liquid and solid dissimilar metals in the equipment for cleaning, including sandblasting, are also installed between the washing tank 4 and the drying oven 7 pickling tank 5 and one more is while washing capacity 6.

Proposed in the present invention, the method combines the immersion of the metal in the hot melt and the process of coating metal with liquid while rolling. In the implementation proposed in the present invention, a method is covered by a layer of flux for soldering surface of the solid base metal is poured liquid metal under the influence of high temperature is the decomposition of the flux. In the presence of a flux for soldering liquid metal is completely wets the entire surface of the solid base metal. Having a high diffusion ability of the liquid metal under the action generated when the rolling pressure quickly cools, solidifies and turns from liquid to solid. Between liquid metal and solid base metal forms a metallurgical bond, providing the possibility of obtaining the proposed method clad metal sheet.

The formation of metallurgical communication largely depends on the wetting liquid metal surface of the solid base metal. This, i.e. the need to completely wetting liquid metal surface of the solid base metal, and explains the need for careful removal from the surface of the solid base metal of all oil stains and oxides and processed sand is until pure metal.

The main problem inherent in existing ways of connecting rolling liquid and solid dissimilar metals connected with the intensive oxidation of the metal during heating, resulting in a low resistance connection and the impossibility of the formation of a metallurgical bond between two dissimilar metals. In order to avoid oxidation of the surface of the solid base metal during heating, in particular for its best wettability of liquid metal, in the present invention it is proposed to use a specially designed flux for soldering.. the Application proposed in this invention a flux for soldering in the form of a coating on the surface of a solid metal after cleaning and sandblasting helps to prevent oxidation of the surface of a solid metal at its subsequent heating at appropriate stages of the process. The absence of oxides on the surface of a solid metal at its connection rolling with liquid metal provides the possibility of formation of a metallurgical connection between dissimilar metals and their strong connection with each other. In the implementation proposed in the invention method can, depending on the base metal and metal for cladding use different fluxes for soldering. With this as a flux for soldering can be used in various aqueous solutions of salts or salt melts.

For reliable dilution liquid metal filling the Cup 17 must be pre-heated to a temperature in excess of 20-50°With a melting point of the liquid metal. Typically, the nozzle is made of a structural material (such as heat-resistant steel, titanium, ceramics and so on) body with a coating of heat-resistant and heat-resistant material. Deformation arising in with a larger width of a thin solid sheet metal under the influence of the liquid metal, preventing the normal solidification of liquid metal in the middle part of the solid sheet. To solve this problem on the basis of the carried out research in relation to the proposed in the present invention is installed to connect the rolling liquid and solid dissimilar metals has developed a new design of the filling of the Cup 17. The design proposed in the invention of a new filling of the Cup used at the facility whose schema is shown in figure 3, depicted in figure 4. Figure 5 shows the image in the direction of the arrow shown in figure 4 And one side of the pouring Cup 17 located therein clamping blocks. Figure 6 shows the image in the direction of the arrow shown in figure 4 And the same side of the pouring Cup, but with a different choice of the location of Eleusis is it clamping blocks. Inside filling of the Cup 17 (figure 4) there are several clamping blocks 174. The presence of filling the Cup 17 such clamping blocks effectively prevents deformation passing through the solid glass sheet metal and allows you to control the amount of liquid metal on each inside of the glass portion of the surface of the solid sheet metal. This design filling of the Cup provides a uniform (number per unit area) distribution of liquid metal across the surface of a solid steel sheet after its hardening. Custom installation with such a pouring nozzle clad metal sheet obtained is flat and has a precisely placed sizes. During the rolling pressure blocks 174 in contact with the surface of the solid sheet metal and contribute to its wetting liquid metal. Also shown in figure 4, 5 and 6, the nozzle 17 used in the present invention is installed to connect the rolling liquid and solid dissimilar metals, has the shape of a hollow parts with internal end-to-end channel. On the side of the Chuck wall 173 of the filling Cup installed heating elements 172, and on the inner surface of the top wall 171 is fixed clamping blocks 174, the lower surface of which is s touch through the glass of a solid metal sheet. Clamping blocks 174 evenly distribute poured into a glass of liquid metal over the entire surface of the moving solid base metal 10. In the upper wall of the pouring Cup 17 has a hole 176 through which the nozzle 17 of the bucket 16 is poured liquid metal, which in the process of rolling planiruetsja passing through the glass of a solid metal sheet.

Rapid cooling of liquid metal by using rolls with a system of forced internal water cooling. The design of such rolls with a system of forced internal water cooling is well known to specialists. Such rolls can, for example, be made of heat-resistant steel with high heat resistance, good thermal conductivity and high strength (such as 5CrMnMo, 5CrNiMo, PCr3WMoV and others). On the surface of the rolls you can also thin, evenly spaced and compact slit for the passage of water vapor, providing more effective cooling of the liquid metal and the formation of the crystalline structure on the surface of a solid sheet as it passes through the gap between the rollers homogeneous.

Proposed in the present invention method can be used for manufacturing a variety clad with metal sheets instead of the traditional way of connecting disparate m is for metal hot or cold rolling. Proposed in the present invention, the method preferably producing clad metal sheets, in which the melting point of the metal used for plating, below the melting temperature of the base metal. To such lakirovannym metal sheets include, in particular, clad metal sheets of steel and aluminum, steel and copper, steel and zinc, steel, lead and tin, stainless steel and steel, copper and aluminum, aluminum and tin, etc. and clad metal sheets of metal with high melting point consisting of titanium, Nickel, molybdenum and other metals and non-ferrous metals and their alloys.

To the above-mentioned steels include carbon steel, alloy or stainless steel, as well as other various types of steel.

Below with reference to the relevant drawings are considered some of illustrating the present invention, examples of its possible implementation.

Preferred embodiments of the inventions

Example 1

As the solid base metal used sheet of stainless steel No. 304 thickness of 0.5 mm and a width of 300-500 mm as metal for cladding used aluminum. The total thickness of clad sheet metal lying in the range from 0.8 to 4.0 mm

First, as is provided in figure 1, performed cleaning of the solid base metal (in particular sheet of stainless steel No. 304). For this solid base metal 10 (in particular a sheet of stainless steel No. 304) wound from a roll that is installed in designed for bending sheet steel coils machine 1. To remove the leaf surface stains oil was passed through a degreasing tank 2. After this, fat-free sheet, passing it through rollers 3, washed in the washing tank 4. Then the sheet was dried in a drying furnace 7. When significant oxidation of the surface of its leaves before drying in a drying furnace 7 passed first through the pickling tank 5, and then through the flush tank 6.

Passing the dried steel sheet through sandblasting unit 8 with one of its sides (plateruena in the future) remove small thickness (0,005-0,001 mm) layer of metal. After sandblasting sheet wound in a roll on intended for this purpose winding machine 9,

For the preparation of a compound of salt were mixed together in equal weight amounts of KF, NaF, KI, Nal and LiI. Adding to the thus prepared homogeneous mixture of distilled water was given to 8%by weight aqueous solution of salts, which is used as a flux for soldering. This solution was poured into the container 13 shown in figure 3 installation.

Skipping about botany described above solid core metal 10, coiled from the machine 11 for unwinding rolls of use shown in figure 3 pulleys 12, through the tank 13 with flux for brazing to the surface of a layer applied flux. An aqueous solution of a flux for soldering was heated in the vessel 13 to a temperature of 80-90°With, at the same time the coating was 5-10 C.

Covered with a layer of solid flux core metal 10 was passed through consisting of low-temperature furnace 15A heated and high-temperature furnaces 15V heated drying unit, in which the metal was heated to a temperature of 200-300°C. Coming from the dryer metal dipascali then through the nozzle 17. Over the pouring nozzle 17 was the bucket 16 to fill the Cup of molten metal. The bucket 16 is filled with liquid aluminum, obtained from molten in a furnace, solid aluminum, after removal from the air and to clean the slag. The temperature of the molten aluminum in the ladle 16 supported at the level of 720-750°C. the feed Rate of the sheet metal was 2.5-5.5 m/s

During the passage of the solid base metal 10 through the nozzle 17 through the pouring hole 176 is continuously added from the ladle molten aluminum, in which the glass was spread on the surface of the solid base metal 10. Temperature filling cups 20-50°exceeded the temperature of prawle the Oia aluminum. Solid base metal with spilled on it with liquid metal passes through the gap between the rolling rolls 18 with internal water cooling. The nozzle 17 has been installed on the main frame 21. Occurring during the rolling process in the gap between the rolling rolls 18 metal compounds have been clad metal sheet 19, which is wound into a roll on the winding machine 20.

Obtained in this example by way of clad metal sheet had the following characteristics:

the strength of the metal compounds40-60 MPa (at a thickness of from 2 to 4 mm)
tensile strength1000-1400 N/20 mm (thickness equal to or less 2 mm).

Example 2

As the solid base metal used sheet of soft steel grade No. A thickness of 1.2 mm and a width of 100-300 mm as metal for cladding used aluminum alloy Al-20Sn-1Cu. The total thickness of the clad metal sheet was equal to 2.0 mm

Clad metal sheet consisting of a medium-carbon steel grade No. A and aluminium alloy Al-20Sn-1Cu, was made according to the technology described in example 1, except that the solid metal was heated in step (4) to 450-550°and the temperature is a liquid aluminum alloy in step (5) was 680-720° C. the tensile Strength in the resulting clad sheet metal lying in the range from 800 to 1100 N/20 mm

Example 3

As the solid base metal used sheet of soft steel grade No. A thickness of 2.5 mm and a width of 100-300 mm as metal for cladding used brass brand No. 62. The total thickness of the clad metal sheet was equal to 3.0 mm

Clad metal sheet consisting of a mild steel grade No. A and brass stamps No. 62, was made according to the technology described in example 1, except that the solid metal was heated in step (4) up to 600°C, the temperature of the molten brass on stage (5) was 1060-1100°and as a flux for soldering used composite molten salt. This composite molten salt consisted of 80 wt.% boric acid, 16 wt.% borax and 4 wt.% phosphate of aluminum. The tensile strength in the resulting clad sheet metal lying in the range from 1500 to 1650 N/20 mm

The above examples allow a better understanding of the present invention. It should be noted that, without going beyond the scope of the invention, in the above options, you can make various changes or improvements.

Advantages of the invention

In the present invention it is proposed to use special is usually used when the Hayk flux for connection with the rolling of two dissimilar metals to form between them a metallurgical connection. Compared with similar known methods proposed in this invention has the following advantages:

(1) higher strength metal compounds Proposed in the present invention the method provides for the formation of a metallurgical bond between two dissimilar metals. Proposed in the invention method, which allows you to adjust the temperature of the molten metal and the temperature of the solid base metal, and the time during which they interact with each other, provides the possibility of making clad metal sheet with a very good structure of the metal at the interface. The bonding strength of the dissimilar metals at having such a structure at the interface of clad sheet metal substantially, usually 2-3 times exceeds the bond strength of the interface of the clad sheets obtained in connection with the rolling of two dissimilar metals that are in the solid state. Thus, in particular, the joint strength at the interface of clad sheet metal, made in the traditional way, based on a combination of rolling two dissimilar metals are in the solid state, typically lies in the range from 10 to 20 MPa, whereas the strength of the connection is in metals in blokirovannom sheet, manufactured proposed in the present invention by the method described in example 1 is from 40 to 60 MPa.

(2) a Low cost of manufacture: by reducing the number of technological operations and reduce power consumption, the cost of manufacturing clad metal sheet proposed in the present invention by way of 20-30% below the cost of production of clad sheet metal in the traditional way, based on a combination of rolling two dissimilar metals are in the solid state.

(3) Decrease of investments In the implementation proposed in this invention the method of the connection rolling liquid and solid dissimilar metals from 50 to 60% of the liquid metal is in the gap between the two rolls during rolling in semi-solid state. Therefore, the implementation proposed in the invention method load (compared to the connection by rolling two solid metals) can be significantly reduced. In addition, technologically proposed in the present invention the method is relatively simple and requires for its implementation a smaller number of units. Therefore, the cost proposed in the present invention the unit by approximately 50-70% below the cost of building a typical installation of the same type, p is designated for connection with the rolling of two dissimilar metals, in the moment of connection in the solid state. Thus, in particular, in the implementation proposed in the invention of the method discussed in example 1, the maximum load capacity is 40 tons, main motor power 75 kW. The production on this setup, 5000 tons of clad sheet metal in the year of its creation required to spend five million yuan. In contrast, in the manufacture of the same clad sheet metal in the usual way in which we connect with each other two dissimilar metal in a rolling moment are in the solid state, the maximum load capacity is 300 tons, and the main engine power of 250 kW. The creation of such a facility with an annual output of 5000 tons of clad sheet metal, you want to spend fifteen million yuan.

(4) High performance: Making proposed in this invention the method of the connection rolling dissimilar metals in a continuous process, it is possible to ensure that its performance was more than twice the performance of conventional connection method by rolling two dissimilar metals are in the time rolling in the solid state.

(5) Reduction of consumption of energy: For the implementation proposed in this of the britanii way when rolling, you must create a force which is 50-75% less effort rolling in the manufacture of clad sheet metal in the usual way, based on a combination of rolling two dissimilar metals are in the time rolling in the solid state, thereby reducing power consumption by approximately 30-50%.

(6) High quality products: In the implementation proposed in this invention method, the liquid metal is cooled quickly in the gap between the two rollers and so quickly crystallizes in fine-grained structure, characterized by small size particles of heavy metal and their uniform distribution throughout the volume of the sheet at a high density. Received proposed in the invention method clad metal sheet with such a structure not only has a high metallurgical quality and good appearance. Thus, in particular, in blokirovannom sheet obtained according to example 2, the average particle size of heavy metal, in this case tin is about 5-15 microns, and the particles are uniformly distributed throughout the volume of clad sheet metal. In this regard, it should be noted that the average particle size of the aluminum in blokirovannom sheet metal, made in the usual way, based on a combination of rolling two dissimilar metals, nah the workers at the time of rolling in the solid state, it is about 20-25 microns.

Industrial applicability

Proposed in the present invention a method of connecting a rolling liquid and solid dissimilar metals and installation for its implementation can be widely used for manufacturing various clad with metal sheets used in construction, machinery, for the manufacture of various pottery and furniture, in the chemical industry, the quality of finishing materials, automotive, aerospace, aviation industry, and for other purposes.

1. The connection method by rolling liquid and solid dissimilar metals, which consists in the fact that the liquid metal is poured on the surface of another heterogeneous solid base metal, coated with flux for soldering, liquid and solid metals rolled under pressure and the liquid metal is rapidly cooled, it hardens and is connected to the surface of the solid base metal with the formation of a metallurgical connection between two or more metals.

2. The method according to claim 1, characterized in that

1) perform the clear operation, during which cleans the surface of the solid base metal from oil stains and other substances pollute it,

2) perform the sandblasting operation, during which the surface of the solid base metal sand UD who have different oxides,

3) perform an operation of applying a coating of a flux for soldering, during which the surface of the base metal after cleaning and processing of sand, put a layer of flux for soldering,

4) perform the heating operation, during which the solid base metal with a coating of a flux for soldering is heated to a certain temperature and then moved to a pouring Cup,

5) perform the operation of casting and metal compounds rolling, during which melt and pour molten liquid cladding metal in the pouring ladle and the molten metal is poured on the surface of the solid base metal, roaming through the nozzle, which has a clamping blocks and the hole for pouring in the melted metal, which, falling on covered with a layer of flux for soldering surface of the solid base metal, wets it, then the solid base metal with spilled on the surface of the liquid metal is moved into the gap between the two rollers with the inner-cooled, liquid metal cooled in the rolling process in the gap between the two rollers forming a metallurgical bond between liquid and solid dissimilar metals and receiving in the clad metal sheet.

3. The method according to claim 2, characterized in that after the cleanup operation 1) the surface of the solid base metal is treated with acid and washed with water.

4. The method according to claim 1 or 2, characterized in that during the operation (5) in the nozzle pour the liquid metal, which smelted in a furnace and removed from the air and slag.

5. The method according to claim 1 or 2, characterized in that the brazing flux is a 6-12%by weight aqueous solution of a composite salt containing KF, NaF, KI, Nal and LiI in the following quantities: 15-25 wt.% KF, 15-25 wt.% NaF, 15-25 wt.% KI, 15-25 wt.% Nal and 15-25 wt.% LiI.

6. The method according to claim 5, characterized in that the brazing flux represents 8-10%by weight aqueous solution of a composite salt containing KF, NaF, KI, Nal and LiI in the following quantities: 20 wt.% KF, 20 wt.% NaF, 20 wt.% KI, 20 wt.% Nal and 20 wt.% LiI.

7. The method according to claim 1 or 2, characterized in that the brazing flux is a composite molten salt, comprising 60-85 wt.% boric acid, 10-20 wt.% borax and 3-6 wt.% phosphate of aluminum.

8. The method according to claim 7, characterized in that the composite molten salt contains 70-80 wt.% boric acid, 13-18 wt.% borax and 4-5 wt.% phosphate of aluminum.

9. The method according to claim 7, characterized in that the composite molten salt contains 80 wt.% boric acid, 16 wt.% borax and 4 wt.% phosphate of aluminum.

10. Installation for connection by rolling liquid and solid dissimilar metals dissimilar installed in the proper order of the machine for bending sheet metal is and from a roll, containers for soldering, drying unit heating, pouring cups, rolls with internal cooling and machine for winding into a roll of sheet metal, while over a pouring nozzle is a ladle for molten metal, and under it is the main frame of the installation.

11. Installation according to claim 10, wherein the drying unit is heated from low temperature drying ovens and high temperature drying oven.

12. Installation according to claim 10, characterized in that the nozzle is made in the form of a hollow part with an inner channel in which is located the heating elements and pressure blocks.

13. Installation according to claim 10, characterized by the presence of installation for cleaning, including sandblasting, which is installed in the proper order machine for bending sheet metal from a roll, the capacity for degreasing, rinsing tank, a drying oven, the unit for sandblasting and machine for winding sheet material into rolls.

14. Installation according to item 13, wherein the unit for cleaning, including sandblasting, is also located between the wash tank and a drying installation pickling tank and washing capacity.



 

Same patents:
The invention relates to the processing of metals by pressure, in particular to the technology of manufacturing hollow knees with internal coating, mainly wear

FIELD: mechanical engineering, restoration of machine parts.

SUBSTANCE: method is realized by applying at least one coating by means of electric spark alloying. Wear resistance coating is applied with use of electrode of boron alloyed intermetallide Ni3Al containing, mass %: Al, 2 - 15; B, 0.02 - 02; Ni, the balance. In variants of invention electrode contains in addition dispersed particles of Si3 N4. Before applying on part layer of wear resistant coating, nickel layer with thickness 20 - 50 micrometers is applied as intermediate adhesion barrier. Coated parts are subjected to mechanical working. Restoration is realized for parts with wear degree up to 100 micrometers or with wear degree 100 - 300 micrometers.

EFFECT: possibility for restoring parts, improving their wear resistance and increasing adhesion strength of applied coating with base material of part.

6 cl, 3 tbl, 3 ex

The invention relates to a method for producing a protective coating on the surfaces of steel

The invention relates to the processing of metals, non-mechanical ways and can be used when applying the protective layer in baths for galvanizing of metal products
The invention relates to the field of applying a protective non-stick coatings on metal products in contact with food products, and can be used to apply protective coatings on household utensils that previously were in operation

The invention relates to wear-resistant and optimized tribological working surface of the cylinder

The invention relates to the coating of plastic material on a metal base and can be used in industry for the manufacture of cans

The invention relates to the field of mechanical engineering, power engineering, chemical and petrochemical industry, specifically, to the field of production of alkaline multicomponent alloys, in particular , is used as the alkaline reagent for regeneration of lubricating oils

FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.

SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.

EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.

14 cl, 6 dwg, 3 ex

FIELD: methods for connecting by welding electric current supply buses arranged in zone subjected to influence of outer magnetic fields.

SUBSTANCE: additive metal placed in casting mold is heated and melted by means of electromagnetic field of HF current induced by inductor arranged in casting mold or in its lid. Plates of cathode slope portion are stepwise fixed from down to up on cathode bus in the form suitable for connection. Flux is applied onto welded surfaces of parts. Additive metal is cyclically fed to welding zone through metallic disc mounted in outlet opening of casting mold or through valve mounted inside outlet opening of casting mold or from intermediate vessel. Melting temperature of metallic disc is equal to that of additive metal or exceeds it.

EFFECT: high quality of electrical and mechanical welded joints formed in operating electrolysis vessel at condition of outer magnetic fields action without interrupting electric current load of current supply buses and without contamination of atmosphere with combustion products.

6 cl, 4 dwg, 1 ex

FIELD: the invention may be used for connection of metallic details primarily of aluminum elements of the current feeding bus of electrolyzers.

SUBSTANCE: the aluminum is heated in a melting pot to 1100-1400oC and delivered into a foundry form installed in the gap between the melting pot and the built-up surface of the metallic elements. The aluminum is fed through a slit channel with the square of the transversal section equal or larger then the tenth part of the square foundry form in the scheme. The channel is fulfilled in the bottom of the melting pot along the contour of conjugation of welded metallic elements. The height of the level of the melt of aluminum fed into the foundry form is chosen larger then the correlation of the total square of the built-up surface of the metallic elements in the foundry form to the inner perimeter of the foundry form in the scheme.

EFFECT: the mode provides reduction of losses of electric energy due to reducing electric resistance of welded connections at increasing their rigidity.

2 dwg, 1 tbl

FIELD: process engineering.

SUBSTANCE: invention can be used, for example in construction of main pipelines. Pipe end faces are butt-jointed and welded together by circular seam. Casting mould is arranged on said joint to heat it and casting mould for reinforcing coupling to be cast therein. Cast coupling cooled down, casting mould is removed. End faces of said cast coupling are welded by circular seams to surfaces of jointed pipes with their walls penetration within 0.2…0.5 δ, where δ is pipe wall thickness. Prior to arranging casing mould on joint surface, a spatial reinforcing metal carcass can be arranged thereon made from more refractory metal as compared with that cast in mould. To cast said coupling, metal molten in furnace or produced by exothermic mix combustion.

EFFECT: higher strength and reliability of pipes joint.

2 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy. proposed method comprises patterns from foamed polystyrene and fitting or pasting 0.05-3.0 mm-thick plates, or rods, or needles subjected to surfacing. Finished patterns with inserts are assembled into pattern modules, coated with gas-tight anti-burning-in paint and dried. Prior to teeming the melt, pattern modules are arranged in flask, filled with loose moulding material, compacted by vibration, sealed and evacuated.

EFFECT: homogeneous alloyed layer.

4 cl, 1 dwg

FIELD: mechanical engineering, restoration of machine parts.

SUBSTANCE: method is realized by applying at least one coating by means of electric spark alloying. Wear resistance coating is applied with use of electrode of boron alloyed intermetallide Ni3Al containing, mass %: Al, 2 - 15; B, 0.02 - 02; Ni, the balance. In variants of invention electrode contains in addition dispersed particles of Si3 N4. Before applying on part layer of wear resistant coating, nickel layer with thickness 20 - 50 micrometers is applied as intermediate adhesion barrier. Coated parts are subjected to mechanical working. Restoration is realized for parts with wear degree up to 100 micrometers or with wear degree 100 - 300 micrometers.

EFFECT: possibility for restoring parts, improving their wear resistance and increasing adhesion strength of applied coating with base material of part.

6 cl, 3 tbl, 3 ex

FIELD: processes and equipment for joining by rolling different type liquid and solid metals, possibly manufacture of clad metallic sheets and articles in different branches of industry.

SUBSTANCE: method comprises steps of pouring melt metal onto surface of different solid main metal coated with flux for soldering; rolling metals under pressure for rapid cooling of melt metal, crystallizing it and joining with surface of solid main metal due to metallurgical joining between two or more metals. Plant for performing the method includes mounted according to desired order: machine for uncoiling sheet metal from coil; vessel with soldering flux; unit for drying and heating; casting nozzle; rolls with inner cooling and machine for coiling sheet metal. Ladle for melt metal is arranged over casting nozzle. Main frame of plant is arranged under said ladle.

EFFECT: enhanced strength of different metals joints, low cost of products, improved efficiency, high quality of sheet metal, relatively small cost of plant, decreased power consumption.

14 cl, 6 dwg, 3 ex

FIELD: many branches of industry; methods of fritting and polymerization in the furnace of the powder coatings.

SUBSTANCE: the invention is pertaining to the method of heating and fritting of the polymeric powder coatings applied on articles and may be used in many branches of industry for painting articles of the various configurations. The method includes: charging by batches of the articles in the furnace, heating with realization of polymerization of their powdery coatings and refrigeration. Before the heating operation in the working space of the furnace create rarefaction by means of preliminary switching on the ventilation and circulation system. After the heating up to the preset temperature conduct the periodical switching-on / switching-off of the electric heater of the furnace. At that the blowout of the air from the furnace is conducted. For keeping the preset temperature over the whole operational volume of the furnace through at least one pilot hole in the furnace the portions of the cold air are periodically pumped in. Then conduct refrigeration, at which the electric heater is finally switched off, and the air saturated with the products of polymerization is removed from the furnace, create the rarefaction and feed the new batch of the cold air into the furnace. For realization of the heating they use the electric heater made out of the steel sheets and the square-shaped metallic tubes. The tubes have holes used for arrangement in them of the tubular rods supporting the spirals. The tubular rods supporting the spirals of the electric heater are made out of the mullitesiliceous ceramics. The technical result of the invention is improvement of the quality of the articles treated in the furnace with simultaneous improvement of the process of heating of the furnace, the air ventilation and circulation.

EFFECT: the invention ensures improvement of the quality of the articles treated in the furnace at simultaneous improvement of the process of heating of the furnace, the air ventilation and circulation.

8 cl, 3 dwg, 1 ex

FIELD: foundry, centrifugal casting in particular; manufacture of multi-layer vessels, pipe lines, bottles, connecting parts and other articles.

SUBSTANCE: proposed method includes placing the thermit mixture in cavities of article, followed by rotation, initiating of exothermic reaction, melting of thermit mixture, cooling of external surface of article and crystallization of molten thermit mixture. Thermit mixture contains additionally fluid material. Cooling of external surface of article is continued till temperature of its internal surface gets equal to melting point of metal of article.

EFFECT: reduced thickness of coat; improved control of heat removal.

FIELD: method of application of metal coats on detachable contact connectors.

SUBSTANCE: proposed method is used for stabilization of contact resistance of connectors at level of initial assembly during entire period of operation in parts made from copper, aluminum and their alloys during assembly, operation and repair of electrical plants and plants manufacturing electrical equipment. Proposed method includes cleaning and degreasing the contact surfaces, applying liquid flux on these surfaces, preheating the surfaces and applying the metal coat; preheating is continued to temperature of 40-45C; metal coat is applied by means of local contact fusion and gallium alloy having melting point not above 30C is applied as metal coat at thickness not exceeding 0.1 mm.

EFFECT: reduction of contact resistance.

6 cl, 1 dwg

FIELD: electron-beam surfacing of flat and cylindrical surfaces, possibly manufacture of new parts and restoration of worn surfaces of parts operating at condition of intensified abrasive wear in combination with impact loads.

SUBSTANCE: in order to enlarge manufacturing possibilities of method, on surface of welded-on article melting zone by means of electron beam is created. Powder composition material for surfacing is fed to melting zone. Surfaced article is moved and powder material for surfacing is fed normally relative to motion direction of article. As coating is applied unfocused electron beam is used for acting upon surface of said coating without supply of material for surfacing. It provides separation of dispersed particles of strengthener from solid solution and formation of multimodal structure of surfacing along its whole thickness.

EFFECT: enlarged manufacturing possibilities of method.

1 dwg, 1 ex

Up!