RU2396141C1 - 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 non-ferrous metals. A preliminary heated cylinder work-piece is scalped and further deformed in a matrix of preliminary heated die. The work-piece is heated in a cartridge having a through axial opening with internal circular cutting edge. For scalping the cartridge with a preliminary heated work-piece is positioned under the die concentric to it and the work-piece is lifted. During lifting an oxide layer is removed off the work-piece with cutting edge of the cartridge; the work-piece with a removed oxide layer is positioned in the matrix of the die. A device consisting of a die in form of a puncheon secured on a movable traverse beam and of a matrix is used for thixo-stamping. The matrix is pressed into a container located on the fixed traverse beam. A pusher is installed under the fixed traverse beam. The cartridge with a cylinder work-piece is arranged coaxially to the pusher on the stop. The puncheon has an axial boring for a plug inserted in an axial opening of the cartridge. ^ EFFECT: upgraded quality of produced items. ^ 2 cl, 6 dwg

Description

The invention relates to the field of metallurgical engineering and is used in the manufacture of products mainly from non-ferrous metal alloys by thix-stamping of cylindrical blanks.

A scalping device is known (see copyright certificate No. 808182, 1972) for processing wire rod, intended for the manufacture of critical parts of high strength.

It should be noted that long workpiece is subjected to scalping in the cold state before its subsequent deformation (drawing) also in the cold state.

A known method of thixoforming cylindrical billets, including heating the billet in the inductor and its subsequent deformation in a preheated stamp (see patent RU 2248857 C2, 2005.03.27).

The disadvantage of this method is that during prolonged and high-temperature heating, which is necessary to transfer the workpiece into a solid-liquid state before thix-stamping, an oxide layer is intensively formed on its surface. With subsequent deformation, the oxide layer is destroyed and passes into the finished product, which reduces its quality.

The technical result of the invention is to improve the quality of the finished product by removing the surface layer of oxides from the heated cylindrical workpiece before its deformation.

The technical result is achieved by the method of thixoforming of cylindrical billets, in which scalping of a cylindrical billet preheated in a glass made with a through hole having an inner annular cutting edge and then deforming is carried out, while scalping is performed by placing the glass with a preheated workpiece under a stamp concentrically him and lifting the workpiece, during which they remove the oxide layer from it with the annular cutting edge of the stack and placement of the workpiece with the oxide layer removed in the die matrix, and a device for the thixo-stamping of cylindrical workpieces, which is equipped with a fixed traverse with a container into which the die is pressed, as well as a pusher mounted under the traverse, a glass with a through hole having an internal annular cutting edge placed in the aforementioned hole of the glass with a stopper and a stop fixed to the fixed beam, the glass is made with the possibility of placing the open end on the stop coaxially to the push rod, and the dream is made with an axial bore in the size of the cork, which has the possibility of axial movement and location in the said axial bore of the punch.

The invention is illustrated by graphic materials, which show:

figure 1 - General view of the device;

figure 2 - the workpiece in a glass (to the left of the axis before heating, to the right of the axis after heating);

figure 3 - placement of the workpiece in the cavity of the stamp;

figure 4 - the end of the stamping;

figure 5 - removal of the finished product;

6 - removal of the glass with the removed oxide layer.

The device for thixo-stamping (see Fig. 1) of the workpiece 1 contains a stamp, a punch 2 of which is mounted on the movable crosshead 3, and the matrix 4 is pressed into the container 5 of the fixed crosshead 6. A U-shaped stop 7 with a hole is mounted concentrically to it on the fixed crosshead. 8 for the pusher 9 and the socket 10 for the glass 11. In the through axial hole 12 of the glass, a stopper 13 is installed. The inner annular edge 14 of the glass is made cutting. On a stationary traverse, a bore 15 is machined to center the cup. In the punch, according to the size of the cork (diameter and height), a boring 16 is made.

The essence of the proposed invention is illustrated by an example of a specific implementation of the method of thixoforming a flange from a cylindrical workpiece:

1. Flange dimensions: diameter - 180 mm, height - 25 mm.

2. The dimensions of the workpiece: diameter - 63 mm, height - 83 mm.

3. The workpiece material is aluminum alloy Al9.

4. The heating temperature of the workpiece is 575 ° C.

5. The duration of the heating of the workpiece is 40 minutes

6. The temperature of the stamp is 450 ° C.

7. The material of the glass and cork is a titanium alloy.

The workpiece 1 is lowered into a glass 11, the hole 12 of which is closed by a stopper 13, and placed in an electric furnace (see figure 2 to the left of the axis). In the process of high-temperature and prolonged heating, the workpiece goes into a solid-liquid state, while it sags under its own weight, and in its lower part an annular influx is formed, called the “elephant leg” (see figure 2 to the right of the axis). With free heating of the workpiece (without a glass) with the dimensions indicated above, the influx diameter is 68 mm and its height is 20 mm. It is obvious that the inner diameter of the glass should be less than 68 mm to ensure reliable fixation of the workpiece in the glass when it is installed on the stop 7. The glass 11 with the heated workpiece 1 is transferred to the press. Rotate the glass 11 with the workpiece 1 in its axial plane by 180 ° and install in the socket 10 of the stop 7 (see figure 1). The pusher 9 is raised, which, resting against the preform 1, centers the cup 11 in the bore 15 of the fixed beam 6. Continuing the rise of the pusher 9, the preform 1 is scalped (the oxide layer is removed from it) with an annular cutting edge 14 and pre-positioned together with the plug 13 in the matrix 4 heated stamp. The oxide layer 17 removed from the preform remains in the beaker 11 (see FIG. 3). It should be emphasized that scalping of a workpiece in a solid-liquid state became possible due to its placement in a confined space (in a glass). The movable traverse 3 is lowered. In this case, the plug 13 is placed in the bore 16 of the punch 2, which deforms the cylindrical workpiece into the finished product - flange 18 (see figure 4). Raise the movable crosshead 3 with the punch 2. The finished product is pusher removed from the stamping zone and remove the plug 13 from it (see figure 5). The pusher 9 is lowered into the lower position, the glass 11 is removed from the stop 7 and release it from the oxide layer. The stamping process is complete.

A method of thixo-stamping of cylindrical workpieces, in which scalping of a cylindrical workpiece preheated in a glass made with a through hole having an inner annular cutting edge and then deforming it is carried out, while scalping is performed by placing a glass with a preheated workpiece under a stamp concentrically and lifting it the workpiece, during which the oxide layer is removed from it by the annular cutting edge of the glass and the placement of the workpiece with the removed an oxide layer in the die matrix, and a device for thixo-stamping of cylindrical billets, which is equipped with a fixed traverse with a container into which the die is pressed, as well as a pusher installed under the traverse, a glass with a through hole having an inner annular cutting edge placed in the said glass hole by a stopper and an emphasis fixed on a fixed traverse, while the glass is made with the possibility of placing the open end on the emphasis coaxially to the push rod, and the punch is made with an axial bore of EPAM tube which is axially movable and positioned in said axial bore of the punch, can improve the quality of the finished product:

- by removing from the surface of the heated billet of the oxide layer before its deformation;

- by maintaining the temperature in the required range, since the heating of the workpiece and its transportation to the stamping zone are carried out in a glass.

Claims (2)

1. The method of thixo-stamping of cylindrical billets, including the deformation of a preheated cylindrical billet in the matrix of a preheated stamp, characterized in that the scalping of a cylindrical billet preheated in a glass made with a through axial hole having an inner annular cutting edge, and then its deformation, while scalping is performed by placing a glass with a preheated billet under the stamp concentrically to him and lifting forging, during which the oxide layer is removed from it by the annular cutting edge of the cup and the workpiece is placed with the oxide layer removed in the die matrix. 2. A device for thixo-stamping of cylindrical billets, containing a stamp in the form of a punch mounted on a movable traverse, and a matrix, characterized in that it is equipped with a fixed traverse with a container into which the die is mounted, a pusher mounted under the fixed traverse, a glass with a through axial hole, having an inner annular cutting edge, placed in the aforementioned hole of the glass with a stopper and fixed on a fixed traverse with a stop, while the glass is arranged to open end in abutment axially with a pusher, and a punch formed with an axial bore-size tube which is axially movable and positioned in said axial bore of the punch.

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