SU1590160A1 - Method of producing hollow articles and die for effecting same - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to methods for the manufacture of hollow articles and devices for carrying them out, and can be used in various fields of engineering to produce hollow articles by stretching. The purpose of the invention is to improve the quality of finished products. The stamp comprises a punch, a flat clamp and a die with a radius edge at the working cavity, an annular recess adjacent to the edge with a limited width and depth, lying on the clamping surface of the workpiece. In the process of drawing sheet blanks, the corrugations are formed in the zone of the annular recess of the matrix and are continuously smoothed at its radius edge. The rest of the flange of the workpiece is pressed against it. 2 sp.f-ly, 6 Il.

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of hollow parts without a flange by deep drawing.

The aim of the invention is to improve the quality of finished products.

FIG. Figures 1-4 show the sheet stock as the hollow article is made from it; in fig. 5 shows the design of an exhaust punch for implementing the method; FIG. 6 — node I in FIG. five.

The method is carried out as follows.

When drawing, the periphery of the flange of the workpiece is pressed, and there is no pressure in the area of the flange adjacent to the deformation zone. In this area, corrugations are formed, which in the process of stretching when moving the flange to the deformation zone, exit to the edge of the flange. The smoothing of the corrugation occurs continuously during the entire stretching on the radius edge of the die.

The method is carried out with Shtampa containing a cutting matrix 1,

punch-die 2, which participates in the cutting and stretching of the part, punch 3, rubber buffer 4, which provides the necessary clamping force of the workpiece between the clamp 5 in order to prevent the formation of folds. An annular recess 6 is formed in the matrix 2 to form corrugations on the workpiece, the dimensions of which are advisable to choose within the following limits: distance to the center of the groove 2R, height of the groove 0.6 /, where R is the radius of the edge of the matrix.

Example. To obtain a high-quality product having a mm, mm (taking into account what the relative thickness

blanks are chosen equal to X, 7),

The following process conditions must be met: stretch force

.d, .5., 13 ts; cutting force

P L-S - SSR-1, TCJ.

sd

with

05

; clamping force (+2; .. 100 tf;

total force

p, + P ,, 7Tc; Stretch ratio

., 55.

A single-crank press K2130B with a capacity of 100 tf can be used as equipment. To make a cut (the 5th and exhaust knots of the stamp, you can choose the marks X12M with a hardness of 69-61 HRC.

 The manufacturing process (a steel cap from a sheet of preform 1 consists of the following operations: I The flat sheet preform is placed between the die 2 and the clamp 5, and the pressure is applied.

 With the help of the cutting matrix 1, the cutting of the workpiece of 1X0146 size is carried out;

: The deformation force from the side of the punch 3 affects the central part

 blanks and produce continuous stretching of the product, as a result of which times: the measures of the blanks vary within the following limits:

at the stage of deformation of the annular unsecured part of the workpiece and drawing it into the working zone of the matrix, the diameter of the flange is 115 MMJ

: h workpiece 40 mm; at the stage of further plastic deformation and exit of the flange edge of the workpiece into an annular recess, flange diameter 107 mm, workpiece h 44 mm; at the stage of moving the edge of the workpiece to the zone of increased specific pressure of the clamp

five

flange diameter 90 mm, workpiece h 50 mm; at the final product design stage, the flange is transformed into an element of the base surface of the hollow product, with a product diameter of 82 mm, and product A 60 mm.

At the end of the drawing process, the pressure of pressure 5 is reduced to zero, the upper part of the die with matrix 2 is retracted and the finished product is removed.

The positive effect of using the proposed method and device is to increase (10 times) the productivity of the process of manufacturing hollow parts by removing the finished product without disassembling the punch when lifting the clamp, as well as improving the quality of the finished products due to guaranteed corrugation.

Claims (2)

 1. A method of manufacturing hollow articles by stretching a sheet blank into a matrix with a clamp, forming corrugations on the flange and their continuous spreading in the straightening zone on the radius edge of the matrix, 5 characterized in that, in order to improve the quality of finished products, the corrugations are formed on the annular portion of the flange of the workpiece adjacent to the straightening zone, and on the periphery of the flange of the workpiece hold down 2. A stamp for making hollow articles, containing a punch, covering its clamp with a flat working surface and a matrix with a pressing surface, a working cavity and a working radius edge, characterized in that the matrix is made with a 35-ring groove of limited depth and width located on it clamping surface and adjacent to the radius edge. thirty  fff ffr fffffffffffffffrrr parl Lls.z f- ag.Z fue. (fuz.S . 6