RU2396142C1 - Procedure and device for cylinder work-pieces thixo-stamping - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: inventions refer to processing parts under pressure and can be implemented at production of items out of cylinder work-pieces, mainly out of alloys of aluminium metals. The cylinder work-piece is enclosed into a shell with upper and lower end flanges, the latter made with an opening, and heated. When specified temperature is obtained, the assembly is transferred into a punch and upset in the shell with a puncheon. The punch consists of an upper half and lower half with a cavity for deforming. Further, an oxidised surface layer of the upset working piece is removed by means of piercing it with the puncheon through an opening on the lower end flange into the cavity of the lower half of the punch. Also material of the removed oxidised layer is left on internal surface of the shell. The work-piece is deformed when the upper half of the punch goes down.

EFFECT: upgraded quality of produced items.

2 cl, 5 dwg

Description

The invention relates to the field of metallurgical engineering and can be used for thix-stamping of cylindrical billets, mainly from aluminum alloys.

A known method for preheating workpieces in a protective environment before deformation and a device for its implementation, eliminating the formation of an oxide layer (see "Technology of forging and stamping". Moscow, Engineering, 1976, p. 108).

A disadvantage of the known method and device is the difficulty of transferring a solid-liquid workpiece from the chamber with a protective medium to the stamp without damaging its outer surface.

A known method and device thixoforming cylindrical workpieces, in which the heating of the cylindrical workpieces is performed in the inductor, and then they are placed in the cabinets and deformed in a pre-heated stamp (see patent RU 2248857 C2, 2005.03.27).

A disadvantage of the known method and device for the thixoforming of cylindrical billets is the formation of an oxidized surface layer upon heating of the billet, which, when deformed, can collapse and partially move to the finished product, which reduces the quality of the product.

The technical result of the invention, the claimed method and device, is to improve the quality of the finished product.

The technical result of the invention is achieved by thixoforming of cylindrical billets, in which before deformation of the billet heated in the shell with the upper and lower end flanges, the last of which is made with a hole, it is deposited in the said shell mounted on the lower die, and then the oxidized surface is removed layer of the deposited workpiece by forcing it through the hole of the lower end flange into the cavity of the lower half of the stamp with the location of the material remotely o the oxidized surface layer on the inner surface of the shell, and a device for the thixo-stamping of cylindrical billets, which is equipped with a pusher mounted with axial movement in the lower half of the stamp, a shell with upper and lower end flanges, a punch installed with the possibility of axial movement in the shell, and interchangeable a washer that can be placed on the lower end flange of the shell and on the end of the ejector, the lower end flange is made with an opening for forcing through of the preform and the said shroud, the core and removable washer adapted to be mounted in the rim of the hot preform in mezhshtampovom space on the lower half of the die and removing it from the workpiece after punching a hole through the lower end flange.

The invention is illustrated by graphic materials, which show:

figure 1 - installation of a heated device with a workpiece on the lower stamp;

figure 2 - Assembly of devices for heating, precipitation and punching into the die blank before heating;

figure 3 - draft blanks in the shell (right);

figure 4 - punching the workpiece in the lower stamp;

figure 5 - stamping of the product after removal of the cartridge with the oxidized surface layer of the workpiece on the inner surface of the shell (right).

A device for thixo-stamping of a product from cylindrical billets 1 includes a lower half 2 of a die with an ejector 3 mounted with axial movement, and an upper half 4 of a die. On the plane of the connector of the lower half 2 of the stamp, a fixture 5 is assembled, assembled from the shell 6 with the upper 7 and lower 8 flanges. A pusher 3 moves in the inner hole of the lower flange 8, and a punch 9 moves in the inner hole of the upper flange 7. A replaceable washer 10 with a central lock 11 is installed at the end of the ejector 3. The position of the replaceable washer 10 in the lower flange 8 is fixed with two pins 12.

An embodiment of the proposed thixoforming method and device operation can be considered by the example of thixoforming of an automobile aluminum alloy brake disc.

The upper 4 and lower 2 dies with extended ejector 3 are heated directly on the press.

Outside the press, fixture 5 is assembled (FIG. 2). In the lower flange 8, we install a replaceable washer 10 and fix it with pins 12. On the flange 8 we place the shell 6 with the upper flange 7. In the inner cavity of the shell 6 we install the blank 1 and then the punch 9. The resulting assembly 5 is placed in the furnace for heating.

Upon reaching the set temperature, the specified assembly 5 is quickly transferred to the interstamp space and installed on the lower stamp 2, centering it with the latch 11. The working stroke of the press begins.

The upper stamp 4 during the course of the press acts on the punch 9, which upsets the workpiece 1, filling the inner cavity of the shell 6.

After filling the shell cavity 6 with metal, the stroke stops and the fixing pins 12 are removed from the lower flange 8. Then, pressure is again applied to the press working cylinder and the punch 9 acts on the metal of the workpiece 1, forcing it through the inner cavity of the lower flange 8.

After completion of the forcing process, the upper die 4 rises and the tool 5 with the oxidized surface layer of the workpiece 1 is quickly removed from the interstamp space, pressure is applied to the working cylinder and the product is stamped. The finished product pusher 3 rises from the cavity of the lower stamp 2 and is removed. The replaceable washer 10 is removed from the end face of the ejector 3.

The proposed method of thixo-stamping of cylindrical billets, in which, before deformation of the billet heated in the shell with the upper and lower end flanges, the last of which is made with a hole, it is deposited in the said shell mounted on the lower die, and then the oxidized surface layer of the deposited workpiece is removed by its punching through the hole of the lower end flange into the cavity of the lower half of the stamp with the location of the material of the removed oxidized surface layer on the inner the surface of the shell, and a device for thixo-stamping of cylindrical workpieces, which is equipped with a pusher mounted with the possibility of axial movement in the lower half of the stamp, a shell with upper and lower end flanges, a punch installed with the possibility of axial movement in the shell, and a replaceable washer that can be placed on the lower end flange of the shell and at the end of the ejector, the lower end flange is made with a hole for pushing through the workpiece, and the said shell, punch and This washer is designed to be installed in the rim with a heated billet in the interstamp space on the lower half of the stamp and removed from it after forcing the billet through the hole in the lower end flange, which improves the quality of the finished product:

- by removing from the surface of the heated billet the oxidized surface layer,

- by maintaining the temperature in a given range.

Claims (2)

1. The method of thixo-stamping of cylindrical billets, including deformation of a heated cylindrical billet installed in the cavity of the lower half of the stamp, when moving down the upper half of the stamp, characterized in that before the deformation of the workpiece heated in the shell with the upper and lower end flanges, the last of which is made with hole, carry out its precipitation in the said shell mounted on the lower stamp, and then remove the oxidized surface layer of the deposited workpiece by forcing it through the hole stie lower end flange into the cavity of the lower die half from the remote location of the material surface layer on the oxidized inner surface of the sleeve. 2. A device for thixo-stamping of cylindrical billets, containing the upper half of the stamp and the lower half of the stamp made with a cavity for deformation of the heated blank, characterized in that it is equipped with an ejector mounted with the possibility of axial movement in the lower half of the stamp, a shell with upper and lower end flanges, a punch installed with the possibility of axial movement in the shell and a replaceable washer that can be placed on the lower end flange of the shell and on the end of the ejector, n the lower end flange is made with an opening for forcing the workpiece through it, and the said shell, punch and interchangeable washer are made with the possibility of installing the assembly with the heated workpiece in the interstamp space on the lower half of the stamp and removing from it after forcing the workpiece through the hole of the lower end flange.

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