SU1551449A1 - Compound die for making parts with an angle less than 90 degrees - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to combined rod for sheet metal forming. The purpose of the invention is to improve the quality of the product by ensuring the perpendicularity of the ends. The stamp comprises a punch with a bending edge, a punch for cutting the product and pressing on the top plate. On the bottom plate is placed a matrix (M) with a bending and two cutting edges. In the matrix with the possibility of limited rotation, an ejector (B) is installed, having a working surface in the upper part with a cylindrical surface on the material supply side. The axis B is located below the mirror M, and the radius of the cylindrical surface is equal to the distance from the axis to the mirror M. During the downward stroke, the product is flexible and the interdigital jumper of the product obtained in the previous cycle is trimmed. During bending deformations, the jumpers are elastic. After the load is removed, the part rises to the level of the mirror M and is supplied by the step size. The stamp allows you to increase the perpendicularity of the ends when trimming the interdetal jumper. 2 Il.

Description

The invention relates to the processing of metals by pressure, in particular to combined dies for sheet metal stamping.

The purpose of the invention is to improve the quality of the product by ensuring the perpendicularity of the ends.

Fig. 1 shows a stamp at the time of the start of bending, a longitudinal section is shown in Fig. 2, the same at the time of the end of the bending.

The stamp comprises a punch 1 with a bending edge, a punch 2 for cutting the product and a clamp 3 placed on the upper plate. On the bottom plate smok

Matrix 4 with bending and two cutting edges is mounted in the matrix with a possibility of limited rotation on the axis 5, an ejector 6 supported on the pusher 7 connected with the buffer device. A backing plate 8 is placed between the matrix 4 and the bottom plate. The cutting edges of the matrix 4 are placed on either side of the punch 2, and the punch 2 is located at a distance from the axis of rotation of the ejector 6 equal to the feed pitch t. The ejector 6 has a working surface in the upper part and a supporting surface in the lower part. Axis 5

СP SD

shl.

Ј CO

located below the mirror of the matrix 4, i by the expression R In §

K p 2

 R is the radius of the cylindrical surface of the ejector; B - punch width for cut

products;

P - angle of rotation of the ejector; S is the blank thickness. The stamp works as follows. The strip is fed to the feeding step. When the upper plate moves downward, the presser 3 presses the strip against the matrix 4 “With further progress, the punch 1 bends at an angle of less than 90 °. At the same time, the ejector 6 rotates at an angle | b, acting on the pusher 7, which compresses the buffer until it closes with the backing plate 8. As a result, the part is edited. The deformation of the interdetal jumper does not affect the quality of the product. This deformation is predominantly elastic in nature. During the reverse course, the punches 1 and 2 emerge from the matrix 4. The ejector 6 lifts the bent blank to the level of the matrix mirror. After the material is supplied by the step size, the finished product is cut off by the punch 2 during the next cycle. ,

The use of a stamp allows improving the quality of the product by ensuring perpendicularity of the ends after trimming.

Claims (1)

Invention Formula Combined stamp for the manufacture of parts with an angle of less than 90 °, containing a clamp and a punch with a bending edge mounted on the top plate, a matrix with bending and cutting edges mounted on the bottom plate, a base plate placed between the matrix and the bottom plate, ejector mounted in (Matrix on the axis with the possibility of limiting, torsional rotation and made with the working surface in the upper part and the supporting surface in the lower part and with the possibility of interaction between the supporting surface and the backing plate, Considering that, in order to improve the quality of the product due to the perpendicularity of the surface of the ends, it is provided with an additional punch for cutting the product placed on the top plate at a distance from the ejector axis equal to the feed pitch, the axis is placed below the matrix mirror, the working surface the ejector and the side surface of the punch are made as parts of cylindrical surfaces on the material supply side, the radius of the cylindrical surface of the ejector being equal to the distance from B ejector to rotate the mirror matrix, the matrix is provided with additional cutting edge, and both edges are located on both sides of the additional punch. 1