EA012124B1 - Method for stamping articles from sheet material and device therefor - Google Patents

Abstract

A method is proposed for stamping articles from sheet material and a device therefor. The invention relates to to cold sheet bending and can be used in all branches of machinery construction for drawing parts from sheet material. The device comprises a lower stationary and an upper movable matrices. A blank sheet is placed on the lower matrix shaped as a future part, then, using hydraulic cylinders the blank sheet is pressed by the upper matrix. Both matrices are connected by a hinge in the form of two loops fixed on both matrices and connected by an axis. The pivot-hinged connection permits to distribute loads from the hydraulic cylinders uniformly as well as evenly draw and bend blanks.

Description

The invention relates to the field of cold sheet bending and can be used in all branches of mechanical engineering for drawing parts from sheet materials. The predominant area of its application is the bending of body parts of cars, buses, agricultural equipment, etc.

The known method of forming thin-sheet large-sized products and a punch plunger press [1]. The method of forming consists of two stages. At the first stage, the stamping is carried out using an elastic punch 1/3 of the predetermined depth. Then the upper plate of the hydraulic press with an elastic punch is raised to inspect the correctness of the start of shaping and create an air cushion over the workpiece. Next, carry out the second stage of the process of forming, in which the upper plate hydraulic press with an elastic punch is lowered with a working force.

The disadvantage of this method is the high energy intensity of the process, the increase in technological allowance, going to waste, and, accordingly, an increase in the consumption of sheet material, as well as an increase in the time of stamping.

There is also known a method of stamping blanks and stamping press for its implementation [2]. The stamping press includes a movable and fixed matrix located at a distance that determines the volume of the workpiece and the outer circumferential wall. The press mechanism includes an axial drive, which, as a result of a reciprocating movement, moves the movable matrix parallel to the axis of the press, and a periodic circular feed drive, which rotates the movable matrix around the axis of the press by the angle of the periodic circular feed. Due to the repetition of these stages is cyclic stamping of the entire workpiece.

The disadvantage of this method of stamping blanks and punching press for its implementation is the high energy intensity of the process, the use of large production areas, an increase in technological allowance, going to waste.

The objective of the invention is to simplify the method of forming products from sheet materials, saving sheet metal, reducing the energy intensity of the sheet bending process, ease of maintenance of the used fixture.

The solution to this problem is achieved by the fact that in the fixture containing the lower fixed and upper movable matrices, a metal billet is placed on the lower matrix having the shape of the resulting part, which is pressed with the help of hydraulic cylinders by the upper matrix according to the invention. with the help of a hinge, representing two loops fixed on the upper and lower matrices and connected by an axis, which allows you to evenly distribute the load from the hydraulic cylinders and evenly but pull and bend metal blanks.

The drawing represents the proposed device for forming products from sheet materials.

A device for shaping articles from sheet materials comprises a table 1, on which a lower movable matrix 2 is installed, connected by means of a hinge 4, to the axis of which the crimping parts 5 are attached to the upper movable matrix 3, on which an insert 6 is attached, attached to a hydraulic cylinder 7 , performing the final exhaust part, the hydraulic cylinder of the main clamp 8 and the hydraulic cylinder crimp parts 9, attached with loops 10, 11 to the upper beam 12 connected to the continuation of the table support 1.

The device works as follows. On the lower matrix 2, having the shape of the resulting parts, lay the sheet stock. The hydraulic cylinder 8 is lowered onto the upper die 3, which presses the main part of the workpiece. Next, the crimping parts 5 attached to the upper die 3 are lowered onto the hydraulic cylinder 7 and the edge of the part is crimped. Then the hydraulic cylinder 7 is lowered, which is connected to the insert 6 located on the upper matrix 3, and the final shaping of the part takes place and the sheet stock takes the form of the lower matrix 2. To remove the molded product from the matrix 2, the hydraulic cylinder 7 is returned to its initial state, then the hydraulic cylinder 9 and the last - hydraulic cylinder 8.

Evenly pulling and bending metal workpieces allows a uniformly distributed load from the hydraulic cylinders 7, 8, 9, which occurs as a result of a swivel 4 of the upper 3 and lower 2 matrices.

Experimental confirmation of the proposed solution received in the course of mass production of body parts of vehicles for 10 years in the ALC "Body parts" (Mogilev).

List of sources

1. B 21 Ό 22/10 VI No. 2042452, Patents of Russia 09.07.95-27.09.95

2. B 21 1 5/02 VI No. 2205721, ΜΙΜΟ8Α LED 2003/006.

Claims (2)

CLAIM 1. The method of forming products from sheet material on a stamping press with fixed and movable matrices by stamping-drawing a sheet blank into the forming tooling by moving the movable matrix under the influence of the press mechanism, characterized in that the hood is carried out under the pressure of the movable matrix, which is sequentially affected hydraulic cylinders, and is made in three stages: first, the main part of the workpiece is pressed, then the part edge is crimped and then finally Forming the part. 2. Device for shaping products from sheet material, which includes a group of matrices, having a fixed matrix and a movable matrix facing the fixed matrix, characterized in that the movable and fixed matrix are interconnected by means of a hinge, which is two loops attached to the upper and lower matrices and the connected axis.