SU1766555A1 - Bending tool for plate-bending machine - Google Patents

Abstract

Use: for metal forming, in particular, bending a sheet or strip in a cold state. SUMMARY OF THE INVENTION: The tool comprises a removable insert fixed to the bending beam. The insert has a cylindrical working surface with a radius R constituting a fourth part of the cylinder surface. A groove is made on the supporting portion of the insert. The angle between the side walls of the groove is SNY & The width of the base of the groove is equal to at least half the size of the radius R. 1 Il.

Description

The invention relates to the processing of metals by pressure and can be used in the construction of an instrument of bending machines intended for bending sheet or strip in a cold state in various fields of engineering.

Plate bending machines are known in which the bending beam is provided with a bending tool, the shape of which itself is varied, depending on the machine effort and the configuration of the resulting products.

Known bending machine, in which the bending tool has a complex curly shape and is connected with the bending beam can be rotated.

The working part of the bending tool in contact with the material of the workpiece has a complex shape with a protruding figured part, due to which the bending arm during work decreases, which leads to an increase in technological effort. In addition, this form of the bending tool is a stress concentrator, as a result tool is small.

The known bending machine is taken as a prototype, having a replaceable bending insert fixed to a bending beam with a working surface and a supporting section, while the bending insert has a solid cylindrical shape.

In the process of bending, the point of contact of the tool with the workpiece is moved around the circumference, as a result of which the bending arm is reduced, and the shear in bending increases, thus the bending tool is subjected to increased loads and its durability decreases.

The aim of the invention is to increase tool life by reducing technological effort.

The goal is achieved by the fact that the bending tool of the bending machine, containing a replaceable bending insert fixed to the bending beam

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WITH

N io

about ate

01 (L

the surface and the supporting section, the working surface of the insert is cylindrical with a radius R and makes up a fourth part of the cylinder surface; on the supporting section there is a groove adjacent to the working surface with backward inclined walls and an edge of Hiem's width N. At that, the angle between the lateral walls and 90 °, and R.: -

H

T

The invention is illustrated in the drawing.

The bending tool 1 is fixed on the bending beam 2 and is made in the form of a removable parallelepiped-shaped insert having a working cylindrical surface of radius R and a supporting part, the working part of the bending tool 1 is 1/4 of the cylinder surface, on the supporting part of the tool 1, mating with the working surface., made a groove with a base A, whose width is equal to H,

and side walls B and C, the angle between

R

which is equal to 90 °, while H - ", and

Points D, D, E, W are the vertices of the bearing part of the bending tool 1.

Sheet 1 is placed on the table 4 and pressed through the clamping beam 5.

The bending beam 2 is made with the possibility of vertical and horizontal movement, the pressure beam 5 has the ability to move in a vertical plane.

The device works as follows.

. The sheet 3 is placed on the table 4 in such a way that there is a protruding part (console), and is clamped by means of a pressure beam 5.

When moving upward of the bending beam 2. The bending tool 1 comes into contact with its working part with the protruding part of the processed sheet 3, the latter bending under the action of technological force.

When the bending beam 2 moves in the horizontal direction (in the range of bending angles from 100 ° and above), there is a reduction in technological effort compared to a continuous bending tool, since due to the groove made on the working surface of the bending tool 1, The bend of the bend is approximately kept constant, which has been confirmed experimentally, therefore, the operation of the tool 1 is carried out under gentle conditions and its durability is increased.

When moving the bending beam 2 in the vertical direction (bending angles from 0 °

up to 90-100 °) bending tool 1 works in approximately the same conditions as when using a tool of continuous cylindrical shape.

Supporting part of the bending tool 1

between its side walls B and C has an SIZO0 angle, if the angle "was less than 90 °, then there would be a decrease in technological capabilities, expressed in that reaching the maximum angle

bending the sheet blank at an angle of 135 ° would be impossible due to the fact that the protrusion of the tool would prevent further movement of the bending beam 2. If the angle is o. was more than 90 °, reaching a bending angle of more than 135 ° is also impossible, t, because in this case the pressure beam 5 will restrict the movement of the tool 1, it should be borne in mind that the greater the width H of the groove on the working

the surface of the tool 1, the faster increases the tendency to reduce its resistance.

Increasing the width H of the base A of the groove made on the supporting part of the bending tool will reduce its side walls B and C and reduce the tool life, since there will be an unjustified decrease in the rigidity of the bending tool 1.

Thus, the proposed form of the bending tool makes it possible to increase its durability by reducing the technological force with an optimum mass and sufficient rigidity.

Claims (1)

Invention Formula Bending machine bending machine containing a removable bending insert mounted on a bending beam with a working surface and a bearing section, characterized in that, in order to increase tool life by reducing technological effort, the working surface of the insert is cylindrical with a radius R and is the fourth part of the cylinder surface, on the supporting section, a groove is mated with a working surface with inclined side walls and a base of width H, and the angle between the side walls 0-90 °, and H |.