SU521998A1 - Powder pressing mold - Google Patents

Description

one

The invention relates to powder metallurgy, in particular to a mold) for the manufacture of blanks by pressing powder.

A known mold for pressing powder, including m & tri, upper and lower punches, equipped with a self-threading thread; And mounted in nuts. The nuts are fixed on the die, and each of the punches is provided with an individual axial displacement drive. In a well-known mold, the shearing process of the powder is complex, due to the presence of individual actuators of the punches, and high force

pressing; This leads to low quality pressed blanks.

The proposed mold is different from that known for, in order to simplify the shearing process, to reduce

efforts to compress and increase the quality of the pressed blanks; the matrix is provided with upper and lower plates, in which the nuts are located, and traverses, which are interconnected by screws with a non-self-braking; threaded, the upper plate is made with the possibility of axial movement, the punches are installed in the cross-arms with the possibility of rotation around their ociH, and the end surface of the punches is made inclined and provided with a notch.

The drawing shows a diagram of the proposed mold, the vertical section.

The mold has upper and lower punches 1 and 2.

The upper punch 1 has, on one side, a right-handed non-self-driving screw. The lower punch 2 is connected by means of a spline joint with screw 3 (see drawing a). Screw 3 has a left-handed Hecf brake thread. Punch 1 and 3 are mounted on thrust bearings 4 and 5 to are threaded with nuts in and 7. Nuts 6 and 7 are fixed in plates 8 and 9. In the mold case 1O, screws 12 are installed on two thrust bearings 11, having the upper part of the right, and in the lower - the left screw non-braking pike) thread.

The screws 12 are secured with nuts and 13 and 14 fastened to the cross-pieces 15 and 16. The nuts 6, 7, 13 and 14 are fixed by pins 17. The screws 12 are pre-assigned to the movement of the lower and upper punches. The fixing center for the PUW 2 at the time of the outflow of the cushion provides a key 18. The lifting of the puncheon 1 and the lowering of the screw 3 is carried out using the rings 19 and 2O.

Press fs ma works as follows ..-- -: - - ...

In the ORIGINAL position, the punches 1 and 2 are, respectively, in the extreme upper and lower positions;. In the mold easyp oot pfoshok. When the press is turned on, the slider (not shown in the drawing), through the traverse 15, transmits movement to the punch 1 and screws 12. The punch 1 makes a gate. Personal movement and translational movement of the Vicka 12 perform a rotational movement, which through the thread and nuts 14 pre-fade into the translational movement of the grass || 16. Moving upward, the traverse 16 causes the lower screw 3 to rotate. Screw 3 is connected with a spline joint by means of a punch 2, thanks to which he begins to perform an oncoming screw motion with respect to the punch 1. During this period of work of the mold, the pressed powder is produced.

In order to ensure better mixing of the compressible mass, an incision is applied to the end surface of the punches 1 and 2. drawing, b). The depth of the notches should be chosen depending on the particle size distribution of the powders and the geometrical dimensions of the pressed Products. To ensure a more intensive compaction of the compressible mass, the end surfaces of the punches must be bevelled at an angle of up to 1O {see drawing, c).

After finishing the pressing of the press, the press ram with the crosspiece 15 goes up. Ring 19 is connected to crosshead 15, through which lifting of punch 1 begins, and through screws 12, crosshead 16 and ring 2O lowering of screw 3 takes place. After the pouzhe; he 1 and vi- 3 will occupy, respectively, the upper and lower position, the press slider stops.

The extruded product is pushed out from the ejector (not shown) of the press using the lower punch 2. The fixed position of the punch 2 with respect to the spline connection and its directional movement during the ejection period is ensured by a key 18.

After removing the product occurs. reverse pusher, resulting in the punch 2 takes its lowest position and engages with the screw 3. The mold is prepared for the next pressing.

The cycle of operation is repeated.

In order to obtain different speeds of the accessory and rotational movement of the upper and lower punches, punches 1 and 2 and communication screws 12 perform non-braking screw screws with different ones.

step by step.

The proposed mold allows to simplify the pressing process and at the same time to obtain products of high density and strength, expand the range and range of manufactured products, and improve the mixing of the starting material. This mold can also be successfully used for hot pressing.

Claims (1)

Formula invented Powder pressing mold, including the die, the upper and lower punches equipped with a self-braking tool and installed in the nuts, 0T and h so that, in order to simplify the shearing process, reduce pressing forces and improving the quality of the pressed blanks; the matrix is provided with: upper and lower plates, in which the nuts are located, and cross-beams, connected with each other by screws with a non-self-braking threaded, with the upper plate made with the possibility of axial movement, the punches are installed in the cross-arms with the possibility of rotation around its axis, and the end surface of the punches is made inclined and notched.