RU2428271C2 - Method of forming thin-wall rings and device to this end - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming, particularly, to producing rings by means of elastic male die and rigid female die. Proposed method comprises locking workpiece between rigid female die with shaping working surface and elastic male die. Rigid male die is fitted inside elastic male die. Working surface shape is produced by deforming the workpiece on pushing rigid male die through elastic die. Surface relief is shape starting from its center. Pushing rigid male die through elastic male die is accompanied by redistribution of elastic male die volume and workpiece strain wave motion along its generatrix from center to edges.

EFFECT: smooth surface with no flutes.

2 cl, 1 dwg

Description

The invention relates to the processing of metals by pressure, in particular to methods and devices for the manufacture of ring parts by an elastic punch into a rigid matrix.

A known method of forming hollow parts with an elastic punch into a rigid matrix, in which the hollow billet is subjected to the distribution of the punch with simultaneous upset by axial impact on its end. In this case, the hollow billet is preliminarily distributed by an amount smaller than the allowable thinning for the stamped material, until a semi-finished product with a volume equal to the volume of the finished part is obtained, and the cavity of the obtained semi-finished product is filled with a filler in the form of balls of elastic material. And after distribution with draft, distribution-calibration is performed by applying a radial force to the workpiece. (AS No. 835568 MKI B21D 22/10 “Method for forming hollow parts with an elastic punch.” Publ. Bull. No. 21 07.06.79.) It is not possible to obtain thin-walled ring parts with a relief surface in a known manner.

The closest solution to the proposed invention in technical essence is the technical solution for the extraction of parts from foil (SU 1144745 A, B21D 22/10, "Stamp for stamping tubular blanks. Publish. 03/15/1985). According to the above patent, shaping is carried out by an elastic punch with a central strong element. The workpiece is fixed between a rigid matrix with a forming relief and an elastic punch. A rigid punch is coaxially mounted in the inner cavity of the elastic punch. The elastic punch is made in the form of a sleeve, the inner cavity of which has a conical section.

The specified method is used to extract parts, and it is impossible to obtain a relief on the side surface. When forming in this way, the stamped material is thinned.

The problem solved by the invention is to develop a method that allows to obtain thin-walled ring parts of large diameter with a relief on the surface.

The technical result achieved using the invention is as follows:

the execution of ring parts of large diameter with a relief on the surface;

reduction of thinning of stamped material;

formation of corrugations on the lateral surface of the stamped workpiece is excluded;

The problem is solved in that the stamping of thin-walled ring parts with a relief on the surface includes fixing the workpiece between a rigid matrix with a forming relief and an elastic punch, into the internal cavity of which a rigid punch is installed, and shaping the relief by deforming the workpiece by pushing a hard punch through an elastic punch, while shaping of the workpiece relief begins from the middle of its location, and the pushing of the rigid punch through the elastic punch is carried out They are designed to redistribute the volume of the elastic punch and move the deformation wave of the workpiece along its generatrix from the middle of the workpiece to its edges.

The stamp for stamping thin-walled ring parts with a relief on the surface contains a rigid matrix with a forming relief, an elastic punch made in the form of a sleeve, and a rigid punch with a conical working surface mounted along the axis of the elastic punch with the possibility of axial movement in the latter, while the elastic punch is made with the conical surface located on the approach side of the rigid punch, the cone angle of which is equal to the double angle of the cone of the rigid punch, and with the cylindrical surface, with said second conical surface, the place of conjugation cylindrical and conical surfaces is located opposite the center of the relief mold.

In order for the relief to form uniformly and symmetrically, namely, it starts from the center of the relief, and the deformation waves move to the edges of the workpiece along the generatrix, and so that both outer edges of the elastic punch touch the rigid matrix at the same time, a cone with an angle equal to a double angle is made on the input part of the elastic punch cone of a rigid punch.

Figure 1 shows the design of the stamp for stamping thin-walled ring parts, which implements the proposed method.

The stamp for stamping thin-walled blanks is a structure consisting of a rigid matrix 1, an elastic punch 3, a cover 4, a rigid punch 5. The elastic punch 3 is made of polyurethane in the form of a sleeve with a conical surface. The cone angle of the elastic punch is 30 °. The elastic punch is fixed in the matrix by a cover and a structural element: matrix. The conical working surface of the rigid punch is made with an angle equal to 15 °. The rigid punch is mounted coaxially to the elastic punch with the possibility of its movement along the axis.

The method is as follows. An annular part with a diameter of 139.4 ^+0.04 with an annular hole in the middle of the ring having a depth of 10 ^+0.025 mm is stamped from aluminum alloy foil AMg2 with a thickness of 0.04 mm. The preform 2 is fixed between the rigid matrix 1 and the elastic punch 3. The elastic punch 3 is also fixed relative to the rigid matrix to prevent it from moving in the axial direction. On the approach side of the rigid punch 5, a conical surface is made in the elastic punch 3. The place of mating of the cylindrical and conical surfaces in the elastic punch is placed opposite the center of the forming relief. Forming begins at the moment the rigid punch touches the elastic. With further movement of the rigid punch, the material is pulled onto the relief. Stamping occurred at a force of 10 kN. The given example stamped concave liners used in obtaining superstrong magnetic fields.

The proposed method on a similar stamp can produce thin-walled ring parts with complex relief surface without folds and corrugations.

Claims (2)

1. A method of stamping thin-walled ring parts with a relief on the surface, comprising fixing the workpiece between a rigid matrix with a forming relief and an elastic punch, a rigid punch is installed in the inner cavity, and shaping the relief by deforming the workpiece by pushing a hard punch through an elastic punch, characterized in that shaping of the workpiece relief begins from the middle of its location, and pushing the rigid punch through an elastic punch is carried out with echeniem volume redistribution core and elastic strain wave moving along a generatrix of the preform from the middle of the blank towards its ends. 2. A stamp for stamping thin-walled ring parts with a relief on the surface, comprising a rigid matrix with a forming relief, an elastic punch made in the form of a sleeve, and a rigid punch with a conical working surface mounted on the axis of the elastic punch with the possibility of axial movement in the latter, characterized in that the elastic punch is made with a conical surface located on the approach side of the rigid punch, the cone angle of which is equal to the double angle of the cone of the rigid punch, and with a cylindrical rotation NOSTA conjugate with said conical surface, the place of conjugation cylindrical and conical surfaces is located opposite the center of the relief mold.