RU1810179C - Method for making holes in sheet material - Google Patents

Abstract

Usage: in sheet stamping. SUMMARY OF THE INVENTION: A blind hole is obtained in a sheet material. Install an insert with a cutting edge in one of the trunks. Lean sheet material on a matrix with a cutting edge. On the other hand, an axial compression force is applied. A hardened layer is formed above the insert. As it moves further, the insert also moves and the part of the material below it separates. With further axial application, a final hole is obtained. 4 ill.

Description

The invention relates to the processing of metals by pressure, in particular to methods for producing holes, and can be used in all sectors of the economy when producing high-quality holes in plate blanks, including mechanical point joints

The aim of the invention is to improve processing conditions and reduce the amount of material removed.

In FIG. 1 shows the initial position of the die tooling before punching the hole; in FIG. 2 is a step of forming a reinforced layer; in FIG. 3 shows the stage of formation of shear cracks on the side of the cutting edges of the matrix and insert: FIG. 4 - stage stripping.

In the plate billet 1, for example, a blind cavity with a diameter smaller than the diameter of the finishing hole is made of hardened aluminum alloy 895.

Next, a cylindrical insert Ј is installed in this cavity: of high-strength material with cutting edges facing the bottom of the blind cavity. Moreover, the diameter of the insert 2 is made equal to the diameter of the blind cavity in the blank 1, and the length of the insert 2 is less than the depth of the blind cavity. As a result, after inserting the insert 2 into the blind cavity of the blank 1, the end face of the insert 2 is placed at a distance h from the plane of the blank 1.

,. Then, the blank 1 is placed on the matrix 3 so that the axis of the hole in the matrix 3 and the blind cavity in the blank 1 are the same. After which the workpiece 1 is fixed with a clamp 4 on the matrix 3 with a force P clamp. Moreover, the axis of the hole in the clamp 4 is aligned with the axis of the hole in the matrix 3. A punch 5 is placed in the hole of the clamp 4 (Fig.

1).

The implementation of the invention is as follows.

Ј

00

about

V4 Yu

When exposed to pulsed force of the RGE, the punch 5 at the first stage of the process, due to the high resistance of the workpiece 1, there is axial plastic compression of the material of the workpiece 1 at the thickness of the p located along the ring between the largest diameter equal to the diameter of the punch 5 and the minimum diameter equal to the diameter of the insert 2. At this stage, insert 2 is practically stationary and there is a flow of the material being processed over insert 2 with filling a blind cavity (Fig. 2). As a result, a hardened layer with a thickness of And is formed, along the perimeter of which there is a radial pressure P. At the next moment of movement of the punch 5, the hardened layer and insert 2 come into motion. The end of this stage is the moment when from cutting (their edges of the matrix 3 and cleft cracks form from the cutting edges of the insert 2. (Fig. 3) Subsequent movement of the punch 5 causes the insert 2 to be removed together in the waste part (Fig. 4) and the high-speed stripping process will be carried out.

The method passed a pilot industrial test when receiving holes in sheet blanks with a thickness of 6.0 mm from alloy V95T. The diameter of the punched hole was 4.0 mm. The stamping equipment was made of U8A steel according to the 7th accuracy class. The punching process was carried out using a MIU-10 magnetic pulse installation accelerating a 450-g drummer. The discharge energy of the installation was 2.4 kJ.

The punched holes were characterized by a low roughness of the walls, 13, cylinder 0

5

0

5

0

5

accuracy and accuracy determined by the accuracy of tooling manufacturing.

The method of producing holes in the sheet. Material in comparison with the prototype is effective because:

improves processing conditions: reduces the volume of material removed by cutting, which reduces the cost of production of high-quality holes.

Claims (1)

SUMMARY OF THE INVENTION A method for producing holes in a sheet material, in which a preliminary hole is made in the material and an insert is inserted into it having a diameter corresponding to its diameter and a length shorter than its length, the material is placed in one plane on the matrix, efforts are applied to its other plane pressure, from the side of the application of pressure forces, a hole of the required diameter is obtained on a part of the height of the preliminary hole by applying forces directed along the axis of the hole in the area between the material bone and the end face of the insert with the simultaneous formation of a reinforced layer adjacent to the end face in this section, and the remainder of the desired hole is obtained by moving the reinforced layer along the axis of the hole, characterized in that, in order to improve the processing conditions by reducing the volume of the removed material , the preliminary hole is made blind, the insert is taken with a cutting edge at one of the ends, and this end is placed with this end to the bottom of the preliminary hole. FIG. / FIG. 2 Fig.Z