SU1311812A1 - Bending die - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to bending dies. The aim of the invention is the expansion of technological capabilities by providing flexible long products. The stamp contains semi-matrices (P) 2 and 3 in the form of semi-cylinders mounted on spring-loaded levers 4 and 5 connected by a hinge located on the axis of the stamp. Support arms 18 are made on levers 4 and 5 with working surfaces located tangentially to semi-cylinders P 2 and 3. With the working stroke of punch 1 P 2 and 3, the workpiece is rolled around, bending it. Changing the thickness of the workpiece within the tolerance does not require additional configuration. There are no restrictions on the length of the workpiece. L zp f-ly, 2 ill. 13 20 Fig. 1 (L 19 00 00 th

Description

The invention relates to the processing of metals by pressure, in particular to tooling for sheet metal forming.

The purpose of the invention is the expansion of technological capabilities in bending lengthy blanks.

FIG. 1 shows a bending stamp (on the left half of the figure in front of the flexible blank, on the right - at the end of the flexible blank), side view; in fig. 2 - the same, top view.

The stamp consists of a punch 1 and semi-matrix 2 and 3 in the form of semi-cylinders, the non-working planes of which are located in the plane of symmetry of the stamp. The semi-matrices are mounted on the respective pivot levers 4 and 5 with the help of axes 6 and 7 with the possibility of rotation around these axes.

Each pair of levers 4 and 5 is hinged to each other by means of axles 8, which are installed in breadcrumbs 9 placed in the slots of the swivel arms 4 and 5. In addition, axes 8 are fixed in breadcrumbs 10 placed in racks 11 with the possibility of vertical movement. The latter are fixed on the basis of 12 stamps. The distance between axes 6 and 7 and axis 8, which ensures bending of the blank 13 of a given thickness, is adjusted with screws 14 and fixed with nuts 15, with the crackers 9 and 10 being spring-loaded with elastic elements, for example compression springs 16. The value of H is calculated by the formula

. + SM) C + RM,

where RjT, is the radius of the punch 1;

SHAKC- the thickness of the workpiece material with a maximum tolerance;

RM is the radius of the matrix.

The initial position of the semi-matrix 2 and 3 provide limiting pins 17. On each pair of pivoting levers 4 and 5 are mounted support brackets 18, working surfaces 19 of which are made relative to the working surface of semi-matrix 2 and 3.

The initial position of the pivoting levers 4 and 5 is provided by the extension springs 20, and the angle of rotation of the levers is limited by the stops 21, the displacement of which is adjusted by screws 22.

The stamp works as follows.

On work surfaces 19 brackets 18 put the workpiece 13, for example, until it stops. During the working stroke, the punch 1 is lowered onto the workpiece and, overcoming the force of the tension springs 20, causes the levers 4 and 5 to turn together with the corresponding semi-matrixes 2 and 3, which in turn, bend around the outer surface of the workpiece 13. At the same time, the support brackets 18 also rotate, the working surfaces 0

five

0

five

0

five

These 19, remaining all the time tangential to the corresponding working surfaces of semi-matrix 2 and 3, support the non-participating ends of the blanks, and at the end of the working stroke these areas of the workpiece are placed between the inclined surfaces of the punch and the working surfaces of the 19 support brackets 18, providing a part with a given bending angle.

When the press reverses, the levers 4 and 5 rotate in the opposite direction under the action of the springs 20, the half-matrix 2 and 3 also return together with the levers to their original position, simultaneously turning around the axes 6 and 7, and the finished part is removed from the stamp.

Adjusting the stamp to a different thickness of the workpiece material and another radius of the flexible part is carried out by changing the size H by moving the crackers 9 with screws 14 and elastic elements 16, as well as by moving the stops 21 with screws 22, and the die’s radius is chosen to be greater than the maximum punch radius to ensure complete break-in of the entire bending area of the manufactured part.

In the proposed die, a change in the thickness of the workpiece material within the tolerance does not affect the surface quality of the part being manufactured, since adjustment of the size H can be made to the maximum thickness of the workpiece within the tolerance, which does not affect the surface quality of the part because the semi-matrices still roll on the outer surface of the workpiece without slipping and locking.

Claims (2)

1. Bending punch containing the base-40 bath, punch and roller semi-matrix, mounted on the ends of spring-loaded pivoting levers, characterized in that, in order to expand technological capabilities by providing flexible long workpieces, it is provided with roller support elements placed on the non-working ends of the pivoting levers that can be moved along the base, the levers are interconnected by a hinge placed on the axis of the stamp, each semi-matrix is made of semi-cylinders, the non-working planes of which are placed in the plane of symmetry passing along the axis of the hinge connecting pivot levers. 2. A stamp according to claim 1, characterized in that the pivoting arms are provided with supporting 55 brackets with working surfaces tangential to the semicylinders. 50 Phage. 2