SU1400723A1 - Die for drawing - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used to stretch hollow thin-walled parts in various fields of engineering. The goal is to improve the quality of products and increase the degree of deformation. The stamp consists of a punch, a flat matrix and a clamp, filled in the form of a holder, in which a clamping elastic metal ring of variable thickness along the radius and an annular stop are mounted. The diameter of the protruding part of the abutment is equal to the diameter of the junction of the exhaust edge of the matrix with its flat surface. The outer and inner diameters of the elastic ring are respectively 1.02 of the outer and inner diameters of the matrix. The ring thickness is determined from the ratio S - (): Wg. E, where q is the pressing pressure necessary to prevent corrugation; R, g are the outer and inner radii of the matrix, respectively; W o - absolute deflection of the ring; E is the elastic modulus of the ring material. The flange of the workpiece during the drawing is pressed by an elastic ring, to which the pressing force is transmitted through an annular abutment. The clamping force is evenly distributed over the entire surface of the flange. I il. (L

Description

The invention relates to the processing of metals by pressure, in particular to dies for drawing thin-walled workpieces, and it can be used to manufacture thin-walled hollow parts in various parts of the engineering industry.

The purpose of the invention is to improve the quality of products and increase the degree of deformation.

The drawing shows a stamp, a longitudinal section.

The stamp contains a punch, a matrix 2, a clamp made in the form of an annular stop 3, an elastic clamping ring 4 mounted in the holder 5.

The diameter of the protruding part of the ring stop 3 is made equal to the diameter of the mating of the exhaust edge of the matrix 2 with its flat surface.

The thickness of the pressure ring 4 varies in the radial direction and is determined from the expression

uh

.,,

w, -E

where q is the pressure, it is necessary

to prevent the corrugation of the workpiece (determined according to reference data) J R., g. - respectively, outer and

M As

inner radii of the exhaust matrix;

r is the value of the current radius, which varies from gm to l. TO"; W - absolute elastic deflection

rings;

E - the modulus of elasticity of the material

rings.

1amp works as follows. The workpiece 6 is mounted on the die 2. The workpiece 6 is clamped with an elastic pressure ring 4. The maximum distance between the workpiece 6 and the ring 4 is observed at a point with a radius r and equal to w. After at. southern effort to at;

ring 4, the elastic deforming, is adjacent to the workpiece 6 and presses it. The stretching is carried out using the punch 1. In the process of stretching the flange of the workpiece 6, it moves between the elastic ring 4 and the working surface of the matrix 2. As a result, the deformation is uneven during the stretching process.

the angle of natural thickening of the flange is constantly changing. Elastically deformed, the ring 4 also changes its geometry (the angle between the working surface of the die 2 and the working surface of the ring 4 repeats the angle of the workpiece 6) and the pressing pressure is evenly distributed over the surface of the flange.

The flange of the workpiece 6 must be kept from corrugation until the entire workpiece 6 is retracted into the die point (until the edge of the flash is reduced to a diameter equal to the diameter of the junction of the extended edge of the die with its flat surface). Therefore, the annular abutment 3, from which the force is transmitted to the elastic ring 4, is made with the same diameter. After the 6-volt blank is placed in the working point of the die 2, the elastic ring 4 takes up its original position (in the drawing to the left of the axis).

Due to the fact that the flange on the whole stretch and the stretch are pressed to the surface of the matrix 1 by an elastic ring, corrugation is eliminated and the quality of the part is improved. The magnitude of the pressing force decreases and, consequently, the depth of draw for the transition increases. As shown by preliminary experiments, the value of the stretch ratio of thin-walled blanks in a stamp with an elastic ring can be increased to 0.5 instead of the traditional values of 0.6-0.7 for hard-pressed strains.

Claims (1)

Invention Formula A drawing punch containing a coaxial punch installed coaxially, a clamp and a matrix, is designed so that, in order to improve the quality of the products and increase the degree of deformation, the clamp is made in the form of an elastic metal clamping ring mounted in a cage the radius is thick and the annular abutment coaxially and in contact with it, the diameter of the protruding part of the abutment being equal to the diameter of the junction of the extruded edge of the matrix with its flat surface, and the thickness of the pressure ring is determined by the ratio neither   991Km1Gm1 N W.E 1D00723 where q is the down pressure required to prevent corrugation of the workpiece; - respectively outdoor and inner radii of the matrix; - current radius value, It is replaceable within the range from GDDDo to 1.02 absolute deflection of the elastic rings; elastic modulus of the ring material.