SU1694343A1 - Mould - Google Patents

Abstract

The invention relates to powder metallurgy, in particular to molds for the manufacture of articles of complex shape. The purpose of the invention is to improve the quality of products and stability in operation. Powder is poured into the matrix, which is then forcibly fed into the conical cavity of the upper punch, the volume of which can be changed by using a device that regulates the height of the backfill 6 sludge.

Description

The invention relates to powder metallurgy, in particular, to press tools for forming articles of complex shape, and can be used on domestic press machines of the AK series,

The purpose of the invention is to improve the quality of products and the stability of the mold.

FIG. 1 shows the device, the general scheme; in fig. 2-6 - schemes of separate units of the device in the course of work.

The mold consists of an upper stand 1, which is attached to the upper press head 2 of the press. The upper punch 3 is attached to the upper rack 1 with the aid of a special tool 4, which regulates the filling height, which is fixed in position with a screw 5. The punch 6 is located in the through hole of the punch 3 and the upper rack 1. Buffer 7 made of polyurethane is located inside the rack 1 and through the washer 8 and column 9 presses the punch 3 to the adjusting device 4.

one

The matrix 10 is attached to the press matrix plate 11. The lower punch 12 is mounted on a press pusher plate 13. The device also contains an emphasis 14 press.

 The device works as follows. At the initial moment, the charge is poured into the matrix 10 using the feeder of the press machine (Fig. 1, left). The upper pressing head 2 is lowered and the punch 3 contacts the powder. Then (Fig. 1, right), due to the fact that the force of supporting the matrix plate 1T with the matrix 10 (1.6 tf) is less than the force required to deform buffer 7 (2 tf) as the matrix 10 moves down, at the same time the powder is filled in The upper forming cavity of the punch 3. Upon further movement of the upper pressing head 2 (Fig. 2, left), the plate 11 with the matrix 10 is fixed on the stop 14 of the press and the punch 3, overcoming the resistance of buffer 7, through the washer 8 and column 9 rests on the rack 1. Simultaneously punch 6 passing

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through the punch 3, forms the upper part of the compact. When the upper pressing head 2 returns to its original position (FIG. 2, right), the upper part of the compact is released automatically, the punch 3 returns to its original position under the action of buffer 7. At the same time (FIG. 3), under the action of the press ejector, the plate 13 moves the punch 12 to the mirror matrix 10, releasing the compact.

When setting up the device, the movable stop 14 of the press is adjusted by the value H (see Fig. 4) and the device 4, which has a threaded load in conjunction with the stand

1 with a predetermined thread pitch to determine the value of B, i.e. camera backfilling in the upper punch 3 when turning at a given angle,

Upon receipt of a suitable product after adjustment, the fixture 4 is fixed by a screw 5, preventing it from failing during press operation.

The punch 6 is located in the rack 1 (Fig. 1, left), stationary, and the punch 3 has freedom of movement, in a free state, it is pressed to the inner end of the device by buffer 7 through the washer 8 and column 9 (Fig. 1, left) with the specified by effort

2ts. In working condition, i.e. when pressing the product, the punch 3 is pressed to the end of the wall 1, overcoming the force of the buffer 7 through the columns 9 and the washer 8 (Fig. 2, left). The level of the punch 6 coincides with the beginning of the conical part of the punch 3, i.e. determined by the device design,

At the initial moment of pressing (Fig. 5), the punch 3 comes into contact with the powder in the matrix 10, leading it down, and the powder from the matrix moves into the free space of the punch 3 with a cone, limited by the working edge of the punch 6. With the full filling of the powder space and further the stroke of the punches 3 and b down the powder is compressed, the punch 3, overcoming the force of buffer 7, which is less than the pressing force of the punch 3, approaches the end of the stand 1, and the matrix 10 with the matrix plate 11 goes to the stop 14,

The matrix 10 with the matrix plate 11 reaches the stop 14, and the punch, being equal to the start of the cone on the punch 3, completely forms the pressing part given

the design of the forming elements of the matrix 10 and the punch 3 (Fig. 3).

During the course of the press head of the press, along with the punches 3 and 6 up the buffer 7

returns the punch 3 to its original position (FIG. 1, 4); the part leaves the punch body 3 by spontaneous sliding out of the conical molding cavity.

The advantage of the proposed device over the known one is that the design of the upper movable punch allows forcing the powder from the matrix to the upper forming cavity, the filling of which is controlled by using a polyurethane buffer with a given rigidity. Adjustment of the height of the backfill of the upper forming cavity is carried out using a tool located on the mount of the upper pressing stand. The extrusion of the workpiece is carried out automatically,. due to the presence of a cone in the upper punch, and from the matrix - the lower punch,

which is mounted on a press pusher plate.

Thus, the use of the invention provides the following advantages: improving the quality of compacts

due to uniform compaction of the powder; simplifying maintenance when setting up a press tool as a result of using a device for adjusting the height of the backfill; automating the extrusion of parts without the use of unstable springs, which simultaneously increases the reliability of the press equipment.

Claims (1)

Invention Formula A mold for the manufacture of products of complex shape, containing a matrix, a lower punch and an upper composite punch, made in the form of a moving element with a forming conical cavity and a through hole and placed in the ejector hole, characterized in that, in order to improve the quality of products and stability work, the movable element is made with a given buffer 0 stiffness and a device for adjusting the height of the filling powder in the forming cavity of the rolling element. l | FP-B W, 2nd Fig 5 FIG. 6