SU645729A1 - Die set for multistage drawing - Google Patents

Description

one

The invention relates to sheet punching and relates to the manufacture of hollow parts of conical, ogival, and the like.

Known multi-transition stamp

stretching of conical, ogival and similar forms, containing a hydroelastic matrix, a clamp, a stepped punch, a clamp-punches installed in the clamp with the

the axial movement of the punch M steps, and removable metal rings of triangular cross section, which are located in the depressions between the pressing punches. Metal rings prevent the material of the workpiece and the environment of the hydroelastic matrix from being drawn into the valleys. As the parts are drawn, the metal rings are removed from the stamps.

However, the known chip is distinguished by the great laboriousness of the manufacture of clamping punches and their corresponding metal rings, the profiles of which

must exactly correspond to the shape of the cavities in which they are installed, since the non-adherence of the metal rings to the pressing punches can lead to the destruction of the metal rings from the high pressure of the hydroelastic matrix. In addition to TOGO, high-pressure metal rings are applied to the sharp working surface of the pressing punch, resulting in the lowering of the latter after removing the metal of the SCF surface from the working surface, annular holes are formed that leave marks on the surface of the parts to be stamped.

The purpose of the invention is to reduce the labor intensity of manufacturing a stamp and improving the quality of the parts being stamped.

For this purpose, the pressing punches are made interchangeable, and the metal rings are made in the form of inserts mounted on the steps of the punch and make up such a part of its working surface.

FIG. 1, fig. 2 to FIG. 3 shows a general view of the stamp on various draw transitions.

The stamp consists of a container 1 with a hydroelastic matrix 2 enclosed in it, a clamp 3, a punch 4 having hollows on its working surface in the form of steps for metal rings 5 which form a triangle shape in radial section, and one of the surfaces of each ring is part of the working surface of the punch 4; several prizhsh-ipuzonov 6 coaxially installed with the punch 4 and the clamp 3.

The operation of the stamp is carried out as follows.

Sheet billet 7 is installed on the clamp 3 and the clamp-punch 6. During the working stroke of the press, the first stretching transition is carried out by pressure from the side of the hydroelastic matrix 2 (see Fig. 1). In this case, the width of the overhang of the workpiece between the punch 4 and the clamp punch b is set such that the preform 7 does not collapse during stretching.

At the end of the drawdown transition, the presser pusher 6 is lowered into the cavity on the punch 4, the workpiece 7 is removed, the presser punch is removed from the punch, a ring 5 is installed in the cavity of the punch 4, which complements the working surface of the punch 4, which is o , instead of a remote pressing punch

6, at the level of the main pressing 3, a new pressing punch is set.

The floor {floor of the workpiece is again placed on the working surface of the punch to inspect the 2nd transition of the stretch (see Fig. 2).

With the working stroke of the press billet

7 under the action of pressure from side 1 of the bore elastic and matrix 2 in the process of the 2nd transition of drawing is now crimped both along the punch 4 and

ON the working surface of the ring 5. After the 2nd transition of the stretch, the pressure is removed from the punch, the corresponding ring 5 is installed in the cavity of the punch 4, which complements the working surface of the punch 4, and the workpiece 7 is subjected to the final drawing B according to the working surface of the punch 4 and the working surface of the rings 5 (see fig.Z).

When punching large batches of parts, it is advisable to first carry out 1 transition of stretching the entire batch of blanks, then (after installing ring 5, adding punch 4 to the working surface and replacing clamp punch 6) 2nd transition of drawing and finally ( after installing the next ring 5, which complements the punch 4 to the full working surface and removes the pressing punch 6) the 3rd stretching transition.

Claims (1)

1. Application No. 2418808, according to which the decision to issue an author's certificate was made. GZ