SU1652016A1 - Die for bending cleat with angles smaller than 90@@ - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to dies for two-angle bending of thin-sheet materials with low ductility. The purpose of the invention is to improve the quality of the products obtained. The stamp contains a matrix, a spring-loaded clamp (PP), a pair of bending punches (GP) and an ejector GP are fixed symmetrically relative to the vertical axis of the stamp and are made with working surfaces oppositely inclined to the axis of the stamp. The working surface of the PP is made of two extreme sections and a central cylindrical section. Extreme portions parallel to the working surface of the punches. The ejector is installed between the GP. During a press slide down, the software elastically deforms the middle part of the workpiece. Extreme areas press the workpiece to the working surfaces of the GP. The matrix bends the side shelves of the workpiece. When the slide is reversed, the ejector removes the finished part. The middle part of the workpiece is straightened. The design of the stamp reduces the laboriousness of its manufacture. 5 il. J

Description

The invention relates to the processing of metals by pressure, in particular to dies for two-angle bending of thin-sheet materials with low ductility.

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

Figure 1 shows the stamp at the time of the beginning of the flexible middle section of the workpiece; Fig. 2 is the same at the time of the end of the bending of the middle portion of the workpiece and the beginning of the bending of the side shelves; fig. 3 - the same, at the time of the end the side shelves are flexible; Fig. 4 is the same at the moment of the middle part area spreading: in Fig. 5, node I in Fig. 3.

The stamp contains the top 1 and bottom 2 plates, the matrix 3, the spring-loaded clamp 4. a pair of bending punches 5 and the spring-loaded ejector 6. The matrix 3 and the spring-loaded clamp 4 are mounted on the top plate 1. The punches are fixed on the bottom plate 2 symmetrically to the vertical axis of the stamp and are made with working surfaces 7, which are oppositely inclined to the punch axis. The angle of inclination of the surfaces 7 is equal to a - /. where a is the desired angle of inclination of the side shelves of the workpiece; ft - the angle of the spring-side shelves.

The working surface of the clamp is made of two extreme sections 8 parallel to the respective working surfaces of the punches 5. and their connecting section 9 with a cylindrical surface. The radius of the cylindrical surface of section 9 is determined by the formula

Os

cl

§

R

ES

where R is the radius of the cylindrical

6ov

clamping surface; E is the modulus of elasticity; S is the thickness of the material being processed; From - yield strength of the processed material.

The pusher is spring-loaded spring 10 and is installed between the punches 5.

The stamp works as follows.

The billet is placed on the ejector b and fixed. When the press ram moves downwards, the spring-loaded clamp 4 carries out free bending of the middle part of the workpiece with section 9. Then the end portions 8 of the clamp presses the workpiece to the respective working surfaces 7 of the punches 5. With the further progress of the slide down, the clamp is fixed and the die 3 bending the side shelves of the workpiece parallel to the vertical axis of the stamp. At the end of the stroke, the clamp rests on the top plate 1, the workpiece is straightened between the extreme sections and the working surfaces of the 7 punches 5. When the press reverses, the die 3 releases the side shelves of the finished part, after which the clamp departs from the part that is bent with radius R. The ejector 6 lifts the part under the action of the spring, while the side shelves of the part slide along the vertical surfaces of the punches 5. After the side shelves of the part come to rest with the planes of the punches, the middle part of the part is completely extended from the cylindrical surface

0

five

plane. The angle of the side shelves of the part is a. The finished part is removed from the die and the cycle repeats.

During the stamping process, the middle section of the workpiece is subjected to elastic deformation, and the two extreme sections of the horizontal flange of the workpiece remain flat. At the end of the working stroke, all three sections of the horizontal shelf form a single plane.

The use of the invention allows to reduce the complexity of the manufacture of the stamp and increase productivity in operation.

Claims (1)

Invention Formula Stamp for bending staples with angles less than 90 °, containing mounted on the top plate of the matrix and the spring-loaded clamp and placed on the bottom plate symmetrically relative to the vertical axis of the stamp, a pair of punches, characterized in that, in order to increase the quality of the products obtained, it is equipped with a spring-loaded ejector installed between the punches, the punches are fixed and made with working surfaces inclined opposite to the punch axis, and the working surface of the spring-loaded clamp is made of two extreme sections parallel to the corresponding working surfaces of the punches and connecting their plot with cylindrical surface. B yf 910SS91