SU1238872A1 - Die for closed die forging of highly plastic materials - Google Patents

Description

The invention relates to the processing of metal pressure, namely, dies for the acrylous volumetric stamping of high plastic materials, mainly under isothermal conditions.

The aim of the invention is to improve the quality of the forgings and reduce their cost, and by eliminating the operation of stripping common burrs on the forgings on the forgings while simplifying the die design.

FIG. 1 shows a stamp at the time of completion of the stamping process of a forging-shaped section, a section; in fig. 2 - green I in FIG. 1 (on an enlarged scale at the end of the stamping process); in fig. 3 - the same in the process of extrusion of the forging; in fig. 4 — node II in FIG. 1 (on a larger scale after opening the stamp).

The stamp consists of mounted on the upper movable plate of the punch 1 and mounted on the bottom plate of the die 2 and the ejector 3.

On the side exit surfaces of the punch 1, on the areas adjacent to its face working surfaces, and on the surfaces of the die, mating with the ejector on the areas adjacent to the working end surfaces of the ejector equidistantly face working surface a, b, and The punch and the face working surface of the ejector at the distance s are grooves 4 and 5. A cavity 6 is made in the die 2 on the side of the bearing surface.

The stamp works as follows.

The workpiece to be stamped is placed in the die 2. After the press is turned on, the punch 1 enters the die and deforms the workpiece, which, filling the die cavity, forms the forging 7. In the process of punching, the metal of the workpiece is partially squeezed into the gaps between the die 2 and the punch 1, as well as between the die 2 and the ejector 3, forming on the forging 7 the upper 8 and lower 9 face burrs (Fig. 2). At the same time, the grooves 4 and 5 are filled with metal, and protrusions are formed on the burrs — on the upper 10 and on the lower 11. After the deformation is completed, when the press reverses during the withdrawal of the punch 1 from the forging 7, the upper face burr 8 breaks off. The end burr is held on the punch by its protrusion 10 and, together with the punch, leaves the die (Fig. 3). After turning on the ejector 3, he, acting on the forging 7, lifts it upward (Fig. 4). When this occurs, the face burr 9 is torn off from the forging 7 in view of the fact that it is held in the die 2 by its protrusion 11. Thus, the forging is removed from the die without the face burrs.

When stamping, the next one; forgings for it, the burrs from the previous one forgings remain in the die and on the punch and resist the flow of metal into the gaps.

between the matched parts of the chip. If this resistance is so great that the metal of the newly formed burrs does not reach the grooves 4 and 5, then its value in

in this case does not exceed the value of s. In this case, if the metal of the newly formed burr reaches the brake groove, then the forging of the forging and removal of the face burr from it occurs in the same way as described above.

The upper burrs that are removed by the punch are gradually squeezed out onto the plane of the punch connector and removed from it by the operator. The lower burrs are pushed and moved into the cavity of the matrix 8, the magnitude of which should be sufficient to accommodate the burrs of the forgings to be forged. During punching of large batches, the supporting part of the ejector can be equipped with dividers, and the die cavity 6 is opened using special channels and grooves. To support the burrs from the forging, it is necessary that the resistance of the metal that has filled the groove is immediately greater than the resistance of the burr to break. To ensure this condition, the width of the 2g groove must be no less than twice the gaps stamped. In order for the residual burrs on the forging to be minimal, there must be a minimum distance to the groove from the working end of the tool.

The shape of the grooves on the punch and in the matrix is semi-cylindrical with a radius of g. The dimensions of the grooves are selected depending on the sizes of the forgings stamped under isothermal conditions in accordance with the table. The dimensions of the grooves shown in the table

selected on the basis of the above considerations and from a technological point of view, based on the use of a blade or abrasive tool for their manufacture. The gaps between the mating surfaces of the stamp are not different from the gaps in the dies used in isothermal stamping of forgings, i.e. they must be kept within the limits of deviations H9, HI 1 for the die and H8, H9 for the punch and ejector according to the SEV 144 standard -75.

Thus, the use of the proposed closed die allows simultaneously with the stamping of the forgings to remove from them the face burrs, the removal of which when using conventional stamps requires additional labor and

amenable to mechanization. In comparison with dies, the design of which allows to prevent the formation of face burrs on forgings, the proposed stamp is much simpler, since it does not contain

no additional complex parts, and has broader technological capabilities, not limited by the shape of the forging in the plan, or by its other design features.

The proposed die design improves the quality of the forgings obtained and reduces their cost, especially according to the width of 2 g of the groove, mm

The distance of the groove from the working end of the punch and ejector, mm

forgings from highly plastic metals or forgings obtained under isothermal conditions.

2 + 0.5 3 + 0.5

4 + 0.5

Fig

Claims (2)

1. A STAMP FOR A CLOSED VOLUME STAMPING OF HIGH-PLASTIC MATERIALS, comprising a case with a punch and die mounted in it, forming a working cavity and having grooves for braking the metal flow, and also an ejector, characterized in that, in order to improve the quality of the parts obtained and reduce their cost, grooves are made on the lateral surface of the punch mating with the matrix and on the surface of the matrix mating with the ejector in the areas adjacent to the working cavity of the stamp. 2. The stamp on π. 1, characterized in that in the matrix from the side of its supporting surface along the perimeter of the ejector cavity is made. Fig. 1 from 00 00 m