SU1581418A1 - Die for bending articles with closed contour from sheet blanks - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular, to the design of a die tool for bending hollow sheet products. The purpose of the invention is to increase reliability by reducing the impact on the mandrel of opposing forces at the final bending stage. The stamp contains the mandrel (O) with the mandrel, spring-loaded in the axial direction, and the matrix (M), mounted in the cage on the buffer studs. Bending sliders are placed on the M in the cage for final bending. At the lower end of O, the supporting surfaces are made, and on M, the return limiting ledges. At the end of the first bend, carried out by the mandrel along M, the force on the die is transmitted not through the mandrel, but directly O through its supporting surfaces. On this stamp, it is possible to bend hollow parts with different cavity configurations. 4 il.

Description

(L

WITH

The invention relates to the processing of metals by pressure, in particular, to the design of a die tool for bending hollow sheet products.

The aim of the invention is to increase reliability by reducing the impact on the mandrel of opposing forces during the final bending stage.

FIG. 1 and 2 shows a stamp at the end of the pre-bending, general view; in fig. 3 - the same plan view; in fig. 4 is a section A-A in FIG. 2

The stamp contains a carrier 2 mounted on the upper movable plate 1, in the hole of which a mandrel 3 is placed. Spring-loaded spring 4. On the lower fixed plate 5 a holder 6 is mounted, in which a matrix 7 is placed, having a stream 8 corresponding to the external dimensions of the part. On the matrix 7 are placed bending slider 9 for

final flexible, having on one side an inclined surface in contact with the corresponding inclined surface of the holder 6, and provided with reset springs 10 held by brackets 11 fixed to the side outer surface of the holder 6. A stencil 12 is positioned above the sliders 9 flat blanks 13.

The matrix 7 contains restrictive shoulders 14, located below the bottom of the stream 8, and the grooves 15 for mounting the stencil, and the holder 2 has a groove 16 in which the bending sliders 9 move and the supporting surfaces 17 are located to influence the limiting ledges 14. The matrix 7 in the upper initial position is supported by the rod 18, spring-loaded from the press buffer, and from falling out — by screws 19. On the bending

(l

00

J

00

The slider 9 on the side of the mandrel is made with beveled edges to improve the conditions of the first bending. Matrix 7 has, in addition to the plane of the limiting ledges 14, three more steps. One stage 20, the upper end of the matrix, is in contact with the stencil

12, and another stage 21 is in contact with bending slider 9 and, together with them in working position, forms a cavity, the dimensions of which are equal to the external dimensions of the part. The third stage 22 is located below the second by an amount equal to the size of the part. The surface of the second stage and the stencil form a channel by which the bending sliders are guided and held.

The stamp works as follows.

In the initial position, the matrix 7 is in its extreme upper position, and the bending sliders 9 are in the diluted state. In the stencil 12 on the bending slider 9 is set flat billet

13. When the mandrel holder 2 moves downward, the mandrel 3 performs U-shaped pre-bending. During the first bend, the matrix 7 is held in its initial position with a spring-loaded buffer, and the bending sliders 9 also remain in the initial position and serve as a matrix for preliminary bending. The first stage of bending lasts until the contact of the ledges 14 of the matrix 7 with the supporting surfaces 17 of the mandrel holder 2. With the further movement of the movable part of the punch down by the pressure of the press, the buffer 7 compresses the buffer, and the matrix 7 gradually moves

to the lowest position, and the bending sliders 9 slide along the inclined surface of the sleeve 6 and approach each other, moving into the groove 16 of the holder 2, and perform the final bending of the part.

When the press ram moves upwards, the support holder 2 moves to the extreme upper position, removing the load from the die 7, which, under the effect of the buffer force, returns to its initial extreme upper position. Bending slider 9 under the action of the spring 10 return out of the grooves 16 of the mandrel 2 and occupy the initial position. The part from the mandrel 3 is removed by the side surface of the groove 16 when removing the mandrel 3 from the groove 16. Under the influence of the spring 4, the mandrel is inserted in its working original position. Then the cycle is repeated.

The issued stamp can be used for bending hollow parts of various cavity configurations and various contours (closed and closing) with a different ratio of material thickness and cross section of the cavity closing the contour.

Claims (1)

Invention Formula Stamp for bending products with a closed contour of sheet blanks, containing a mandrel holder mounted on a movable plate with a mandrel and mounted on an elastic base on a stationary plate in a cage with a bending broach and bending sliders for final bending with return springs, installed with the possibility of interaction with wedge surfaces cage and axial displacement joint with the matrix, characterized in that, in order to increase reliability by reducing the impact on the mandrel of the opposing Silius final bending step, on the lower end opravkoderzhatel formed bearing surfaces on the matrix - restrictive ledges for cooperating with abutment surfaces opravkoderzhatel placed below the bottom Ruch River matrix. jO Chf7-f u Fig.Z