SU1377163A1 - Method of trimming allowance - Google Patents

Abstract

The invention relates to the processing of materials by pressure and can be used when trimming an allowance on a plate blank of a laminate fiber composite material. The purpose of the invention is to improve the quality of the parts produced. On the side surface of the workpiece 1, curved grooves 2 are made. A compressive force is applied along the separation line, which in the area of the grooves 2 is 1.1-1.2 of the amount of force on the rest. Cut the seam allowance 5 into separate parts and apply additional force with the help of the punch 6. Then they are divided with the help of knives 7 with beveled edges. The presence of curved grooves 2 and variable compressive force provides the same depth of penetration of interlayer cracks along the entire front to the plane of separation. 2 Il. (L

Description

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The invention relates to the processing of materials by pressure, in particular to a method for trimming an allowance on a plate blank of a laminated fiber composite material.

The purpose of this invention is to improve the quality of the parts produced.

FIG. 1. A workpiece is shown, on the side surfaces of which a curved grooves are made; Fig.2 stage of the process of trimming allowance in the stamp.

Curved grooves 2 are made on the side surfaces of sharpening 1, perpendicular to the direction of the compressive force, to a depth not less than the thickness of the material being processed. In this case, the lower boundary of the grooves 2 lies in the separation plane. The workpiece 1 is fixed in the die using the pads 3 of the clamping mechanism 4 by applying compressive forces directed parallel to the plane of separation. The allowance 5 is left free from compressive forces. The compressive force is made variable, and the magnitude of the compressive force in areas equal to the projections of curved slots on the separation plane is 1.1-1.2 times greater than the amount of this force on the rest of the workpiece, which in turn is (0). , 75-0.8) Ets. Then, the allowance 5 is dissected into several parts using a wedge (not shown), and the wedge is stopped at the position when interlayer cracks reach the slots of curvilinear shape. Further, an additional force is applied in the direction perpendicular to the plane - separation, with the help of punches. When moving the plunger 6, elastic compression of separate parts of the allowance 5 occurs and their subsequent bending. In this case, interlayer cracks propagate into the depth of the material and reach the separation surface. The presence of curved grooves 2 and variable compressive force provides the same penetration depth, interlaminar cracks both on the lateral surfaces of the workpiece and in the depth of the material, i.e. all over the front. Then trimming allowance 5 is carried out by introducing

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Jay 7 with beveled edges in the material being processed.

PRI me R. On a workpiece 1 of composite material such as GSP, having a thickness of 15.1 mm, a width of i 32 mm and a height of 65 mm, the stock is separated, the value of which is 27 mm. Previously, curved grooves 2 are made on the side surfaces of the preform 1. Next, the preform 1 is fixed in the die, while the lower boundary of each of the grooves 2 lies in the separation plane. 5 The compressive force in the area of the grooves 2 is 2300 kg, in the remaining part 1800 kg. The separated allowance is divided with a wedge tool into three equal parts with the application of a force of 340 kg, with the resulting interlayer cracks reaching the top edge of the groove. After an additional force of 1600 kg is applied, the individual parts of the allowance 5 are bent. Next, the knives 7 with beveled edges with a force of 3300 kg are introduced into the workpiece 1 and the separation is carried out.

The use of the invention improves the quality of the parts obtained by limiting the zone of propagation of cracks between the layers of the material being processed when it is cut.

Claims (1)

Invention Formula The method of trimming allowance mainly on plate blanks of laminated fiber composite materials, including fixing the workpiece in the stamp by applying compressive forces directed parallel to the separation plane, dissecting the allowance into several parts and applying additional forces in the direction perpendicular to the plane of separation, and after. Blowing division, differ-. In order to improve the quality of the parts produced, before fixing on the side surfaces, the preforms, which form perpendicular to the direction of the compressive force, perform curvilinear grooves, the longitudinal axes of which are parallel to the separation plane, and from grooves with the side surface of the workpiece lies in the plane of separation, with the magnitude of the compressive force in areas equal in area to the projections curvilinear grooves on the plane of separation, 1.1-1.2 times the magnitude of this force on the rest of the workpiece. Pine section neither Z.