SU940929A1 - Die for blanking and multiimpression drawing during press slide one stroke - Google Patents

Description

The invention relates to the processing of metals by pressure and relates to die tooling.

A stamp for two consecutive stretching operations in one stroke 5 of the press slide, containing a stepped die and a telescopic punch, is known, the inner part of the iKOTOporo is held in connection with the outer part by latches 1.

A disadvantage of this device is that the drawing operation is carried out in it from blanks that need to be cut from the sheet, which makes the process of manufacturing products inefficient .15

The closest in technical essence and the achieved result to the described one is a cutting and multi-transition shtamp in one stroke of the press ram, which contains a support ring, 20 inside which are cut-off and exhausting matrices, a movable plate fixed on it with a telescopic punch with the fixing unit of its parts, prizhi1m with a cutting edge on the outer 25 surface and levers that interact

with a clip and with a mobile plate.

The disadvantage of this shtamp is the poor quality of the parts being pulled, due to the fact that the pressure in the process 30

The first stretch is carried out by the spring, which pushes the first stretch punch, and due to the displacement of the punch, the resistance of the spring is compressed, and the pressing force is changed accordingly. This leads to the impossibility of maintaining an optimal pressing force during the entire process of the first stretching, which leads to the destruction of the part in the danger zone in the case of a strong pressure and to the corrugation in the case of a small pressure.

The aim of the invention is to improve the quality of the stretchable parts by maintaining an optimal clamping force during the first draw transition.

Claims (2)

This goal is achieved by the fact that in a cutting punch and multi-transition stretching in one stroke a press slide containing a support carrying coaxially arranged cutting and drawing dies, a movable plate with a telescopic punch, a clamp in the form of a sleeve with a flange and with a cutting edge on the outer surfaces and pivotally attached levers on the support, kinematically connecting the movable plate with the clamp, the matrix of the first transition is mounted with the possibility of axial movement, the clamp is freely mounted on the support, and the chip is equipped with a ring of elastic material located between the onory and the flange of the clamp. Another difference is that the stamp is provided with rollers mounted on the clamp and the movable plate at the places of their contact with the levers, and the levers are made of profiled ones. FIG. 1 shows a general view of the stamp in a longitudinal section; in fig. 2 shows an embodiment of a stamp (the upper part is conventionally not shown). The stamp contains a stationary plate 1 with a support 2, in 1 of which a guide ring 3 is placed, a die 4 is cut, the first 5 matrixes and the second stretch block are 6, a movable plate 7 fixed on it: a telescopic punch with an outer 8 and an inner 9 parts, the fixing unit of parts 8 and 9 of the punch, made in the form of a latch 10, preloaded by a spring 11, and an ejector 12 placed in radial holes made in parts 8 and 9 of the punch, covering the punch clamp 13 with a flange and with a cutting edge on the outer surface , elastic element 14, placed between the supports 2 and the first extraction matrix 5, a ring 15 made of an elastic material, located between the ring 3 and the pressure flange 13, hinged on the axis 16, profiled levers 17, kinematically connecting the movable plate 7 with the pressure 13, and rollers 18 and 19, mounted rotatably on axles 20 and 21, which are fixed on the movable plate 7 and the clamp 13 at their contact with the levers 17. The clamp 13 has a groove 22 terminating with a bevel 23. Axial movement of the matrix 5 of the first transition can be carried out directly elastic element 14 or p and support rods 24 with the washer 25 in contact with the package ring 26 of elastic material. The stamp works as follows. When the press slide (not shown) moves down, plate 7 with the punch and rollers 18 moves down in the same direction. The latter pressure the levers 17, which, turning around the axes 16, move down the presses 13 through the rollers 19. 15 of the elastic material is compressed. The position of the levers 17 at this moment of the work of the stamp is shown by the parade. The clamp 1.3 with a cutting edge, which plays the role of a cutting punch, performs with the cutting matrix 4 cutting of the workpiece (not shown). During the further progress of the press slide, the outer part 8 of the punch, through the matrix 5 of the first stretch, makes the first transition of the stretch. The required pressing force of the workpiece during the first drawing is due to the deformation of the ring 15 and the pressure of the levers 17 on the pressing 13. At the first drawing, the ejector 12 locates on the bevel 23 and moves to the die axis together with the latch 10; the outer 8 and inner 9 parts of the punch are disengaged, and further downward movement is performed only by the inner part 9, which through the matrix 6 of the second stretch performs the second stretching junction. The precarious stamp allows to improve the quality of the stretchable parts by maintaining an optimal pressing force during first transition stretching. Claim 1. Stamp for punching and multi-transition stretching in one stroke of a press slide containing a support carrying coaxially arranged cutting and drawing dies, a movable plate with a telescopic punch, pressing in the sleeve with a flange and a cutting edge on the outer surface and sliding levers fixed to the support, kinematically linking the movable plate to the clamp, are augmented by the fact that, in order to improve the quality of the parts to be pulled out, by maintaining an optimal clamping force during the first transition The matrix of the first transition is axially displaced, the clamp is freely mounted on the support, and the stamp is provided with a ring of extruded material located between the support and the clamp flange. 2. A stamp in accordance with claim 1, characterized in that it is provided with rollers mounted on the clamp and the movable plate at the points of their contact with the levers, and the levers are made profiled. Sources of information taken into account in the examination: 1. USSR author's certificate number 60082, cl. B 21 D 24/00, 1940. 2. The author's certificate GCCP № 459286, cl. B 21 D 22/02, 01.29.73 (prototype).