SU709218A1 - Hole punching and edge-beading method - Google Patents

Description

(54) METHOD FOR PUNCHING AND CLEANING HOLES

I

The invention relates to sheet punching and can be used for punching holes and flanging edges in sheet blanks.

There is a known method of punching and flanging holes in sheet blanks, in which the separable part of the workpiece is clamped (into the hole punching hole) and the non-deformable part (outside the forming side) 1.

In accordance with a known method, at the beginning of the process, a non-deformable part is clamped, then a part of the preform is deformed, on which during further processing the holes and the board should be located, the deformed section is clamped, and then the hole is punched.

The disadvantage of this method is that it does not provide the possibility of obtaining a clean cut surface and allows only low beams to be obtained.

The purpose of the invention is to increase the height of the bead and improve the quality of the cut surface.

This is achieved by clamping the detachable part of the workpiece before starting the deformation process at the same time across the entire area of the detachable part, keeping it in a clamped state until the end of the deforming process and depressing it after that, releasing and clamping simultaneously throughout the entire detachable part.

FIG. 1 shows the workpiece and the tool before the start of deformation; in fig. 2 - the beginning of the punching hole; in fig. 3 - in the process of forming the bead.

PRI me R. In a billet made of aluminum 200 x 200 mm in size, 1.5 mm thick on a press with a force of 25 tf, with a stroke of 65 mm and the number of strokes 120 in 1 min a hole is punched with a diameter of 40 mm, flanged to a diameter of 64 mm, the height of the board is 17 2 mm.

Punching and flanging are carried out simultaneously. The deformation is carried out using a punch containing a punch having a punching stage 1, a flanging stage 2, a pressing 3, a die 4 and a counter-punch 5.

Claims (1)

Claim The method of punching and flanging holes in sheet blanks, in which the detachable and non-deformable parts of the workpiece are clamped, characterized in that, in order to increase the bead height and improve the quality of the cut surface, the detachable part of the workpiece is clamped before the start of the deformation process and released after the end of the flanging process and is carried out clamp simultaneously over the entire plane of the detachable part.