SU558739A1 - Stamp with elastic tool - Google Patents

Description

(S4) STAMP WITH ELASTIC TOOL

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The design relates to tooling for cold forming and can be used in mechanical engineering.

Known stamp punching and cutting thin-sheet parts, in which elastochny tool (matrix) has a flat working surface 1.

The durability of dies with such dies is insufficient, as in the process of stamping, tensile stresses arise on the working surface of the matrix, which leads to its destruction. Failure begins on the work surface where maximum tensile stresses act. The crack grows when the die is deformed, and the stamp becomes unsuitable for further operation.

The proposed stamp with an elastic tool placed in a container in one part of a piece and a rigid tool, mainly with cutting edges, in another part of the stamp, differs from the well-known one in that it has a curvilinear surface to increase the stability of an elastic tool. concave areas in areas adjacent to the sites

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Interaction of a hot one tool with a hard tool cutting edge.

FIG. 1 shows a stamp according to the invention with an elastic instrument having a concave working surface; FIG. 2 shows a stamp with an elastic instrument having a working surface of complex curvature.

The stamp contains a hard punch 1, a thick-walled container 2 and an elastic} mattress (tool) 3, which has a curved working surface. On the punch 1, the templates 4 and the blank 5 are installed.

The stamp works as follows.

When the punch 1 moves, the pressure through the cutting template 4 and the workpiece 5 is transferred to the elastic matrix 3. A sludge of the elastic matrix occurs. The shape of the working surface 6 of the matrix is chosen such that during the deformation process the area of this surface decreases, so that the surface only experiences compression. In the process of precipitation, the working surface of the curvilinear matrix becomes flat and then convex with compressive stresses on the contour.

With the further course of p) tnsona, there is a deformation of the workpiece and an indentation in

elastic matrix. The deflection is continued until the metal of the workpiece is separated along the contour of the puzison. When the metal punch and the workpiece are pressed further into the elastic matrix, stretching can occur in it. However, due to the fact that in the beginning of the working stroke of the punch on the surface of the elastic matrix, Squeezing was created, resulting in tensile stress, appearing on the surface of the elastic matrix of the workpiece to deform the workpiece, significantly less than with splashing work surface.

On the {11-linear surface of the matrix with concave areas in the zones, there are no tensile crests at the time of separation of the headpiece to the points of its interaction with the punch (Fig. 2).

The use of a stamp proposed by the design allows to obtain batches of parts without replacing the elastic matrix. Tests on the durability of the punch, with a cardiovascular working surface, have shown that their durability is increased by more than 2 times.

Claims (1)

1. Shavrov HJ. and others. Cutting and punching of thin-sheet metal in stamps with mat {polyurethane scissors. - Shipbuilding Technologists, 1974, No. 6, p. 57-62. 3 Fyg1