SU1625582A1 - Master punch for pressing out the cavities of semi-dies of injection mould - Google Patents

Abstract

The invention relates to the processing of metals by pressure, namely to the production of dies by cold extrusion. The goal is to reduce the complexity of manufacturing semi-matrix and expanding technological capabilities. The master punch for extruding cavities of the semi-matrix contains two oppositely directed working parts with a single side surface and an anvil flange with plane-parallel abutment surfaces rigidly fixed in the cross-sectional area corresponding to the plane of the mold connector. The stop flange can be made in the form of protrusions with opposite areas relative to a given axis of the master punch with the same areas of the stop surfaces. Conductor holes can be made in the stop flange. When the master punch is in operation, the workpieces are placed on both sides relative to it and their working parts are pressed into the workpieces against the stop in the thrust flange. 2 hp f-ly, 7 ill. with s

Description

The invention relates to the processing of metals by pressure, namely to the production of a matrix by cold extrusion.

The purpose of the invention is to reduce the labor intensity of the manufacture of a semi-matrix and the expansion of technological capabilities.

Figure 1 shows the master punch with a flange; figure 2 - master punch with opposing projections; on fig.Z - section GG on figure 2; Fig. 4 shows the initial stage of the process of extruding the working cavities of the semi-matrix of the mold; Fig. 5 illustrates the stage of completion of the process of extruding the working cavity with a smaller volume; Fig. 6 shows the relative position of the blanks and the master punch after the extrusion process is completed; .on

Fig. 7 illustrates a master punch in a semi-matrix blank when used as a conductor for making base holes.

Master punch 1 contains two oppositely directed working parts A and B. The contour of the side surface B corresponds to the contour of the working cavity of the mold in the plane of the connector.

On the side surface of the master punch 1 in the zone corresponding to the plane of the mold connector, there is a rigidly fixed thrust flange 2 in which the bushings 3 with conductor holes are installed. The thrust flange 2 can be formed oppositely located relative to the longitudinal axis of the master punch.

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protrusions 4 and 5 with the same values of the areas of the thrust surfaces.

In the process of extrusion of semi-matrixes, the counter forces applied to blanks b and 7 are equal in size, and therefore, at any moment of deformation of semi-matrix blanks before one of them contacts the stop flange on the master punch 1, the latter displaces equal volumes of metal in the blanks. Therefore, the thrust flange on the master punch 1 earlier reaches the surface of the semi-matrix blank, the working cavity of which has a smaller volume.

The force corresponding to this moment is distributed additionally over the area of the thrust flange, the magnitude of the stresses in the workpiece decreases sharply and becomes less than the yield point, which causes the termination of plastic deformation in the half-matrix workpiece with a smaller working cavity.

The subsequent application of force causes deformation of only the workpiece of the second semi-matrix, which also ceases when the thrust flange of the master punch 1 reaches the workpiece surface, which is accompanied by a sharp increase in the resistance to deformation. At this point, the process of extruding the entire working cavity of the mold is completed,

Semi-matrix billets with extruded working cavities and a master punch pressed into them are removed from the press and the master punch is removed.

Then, the support planes of the semi-matrix and their planes corresponding to the plane of the mold connector are machined.

After that, the master punch 1 is alternately inserted into the extruded cavities of the semi-matrix, and basic holes are made in the semi-matrix through the conductor holes in the stop flange, with respect to which the manufacture of the mold is completed.

If there are opposite parts on the side surface of the product manufactured in the mold, which are subject to subsequent mechanical

processing and therefore not requiring precise alignment, the thrust flange 3 ne master punch 1 is made in the form of oppositely located relative to the longitudinal axis of the master punch 1

protrusions with the same values of areas of resistant surfaces.

In the case of the manufacture of multi-mold with working cavities of places in semi-matrix, having not identical

volume values, the master punch contains a single stop flange, in which the master punches are rigidly fixed to extrude each part of the mold.

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formula of invention

Claims (3)

1. Master punch for extruding cavities of the semi-matrix of the mold, which together form a single working cavity containing two oppositely directed working parts with a single lateral surface, the cross-sectional contour of which corresponds to the contour of the working cavity of the mold in the plane connector, characterized in that, in order to reduce the complexity of the manufacture of semi-matrices and expand technological capabilities, it is equipped with a stop Flange with plane-parallel stop surfaces rigidly fixed on it in the area of the cross section corresponding to the plane of the mold connector. 2.Master punch according to claim 1, about tons of h and h and with heme, that the stop flange is made in the form of protrusions located opposite to the longitudinal axis of the master punch with the same values of the areas of the thrust surfaces. 3. Master punch according to claims 1 and 2, which is based on the fact that the thrust flange made with conductor holes. (rig. 1 FIG. 2 Fig.Z but FIG L FIG. b FIG.