RU1821266C - Method of stretching of vehicle body parts - Google Patents

Abstract

SUMMARY OF THE INVENTION: the preform is first placed in a stamp, then the preliminary part of the workpiece is preformed and pressed between the working surfaces of the die and the clamp of the stamp, and the central part of the workpiece is pulled into the die cavity by a punch. First, the peripheral part of the workpiece is deformed and pressed over the portion of the die pressing surface having the smallest curvature, and then over the portion of the die pressing surface with greater curvature. 5 ill.

Description

The invention relates to sheet stamping and can be used in all engineering industries to draw parts from a sheet blank. The predominant area of its use is the extraction of large-sized body parts of automobiles, buses, trolleybuses, tractors, agricultural machines, household and other equipment.

The purpose of the invention is to improve the quality of elongated parts and to save sheet metal by expanding the technological capabilities of the method when using clamping surfaces in the stamp that are significantly different from developing surfaces.

In FIG. Figures 1 and 2 show the designs of two typical body parts of complex shape after a drawing operation. The pressing surface of these semi-finished products is conventionally divided by a dashed line into two surfaces of minimum 1 and maximum 1 Ј of curvature.

The method is carried out as follows.

The workpiece 3 is placed in a stamp (see About Figs. 3, 4, 5), with the external slider N 5 5 press down, first the workpiece 3 is clamped over a portion of the clamp surface hO of a stamp of lesser curvature using Qs of clamp sections 4.5 and hydraulic cylinders 6, 7,: Q and then clamp the workpiece using the clamp sections 8 without hydraulic cylinders. Then, during the course of the internal slider of the press down, the central part of the workpiece 3 is deformed using the punch 9 and the matrix 10.

Example p. The proposed technical solution is used to draw a large body part 2108-8402024. The outer panel of the hood of a VAZ-2108 automobile. A sheet blank of dimensions 0.8 X 1000X 1500 mm made of steel of the grade 08YU OSV1-B GOST 9045-80 is put into a stamp, then, during the course of the external press slide, first, two sections of the blank 1 (see Fig. 1) are pressed down with less curvature, and then the rest section of the workpiece 2 (see Fig. 1) of greater curvature. Further, during the course of the internal press slide, the central part of the workpiece is deformed and the surface shape of the finished part is formed.

Using the proposed method of extracting parts from sheet materials will allow, in comparison with the prototype, to improve the surface quality of body parts

lei and reduce the metal consumption rate for each part by about 3-5%. SUMMARY OF THE INVENTION A method for drawing body parts on a double-action press from sheet blanks by deforming and pressing a peripheral part having sections with greater and lesser curvature and drawing a central part, characterized in that, in order to improve quality and save sheet metal, Deformation and pressure of the peripheral part of the preform are carried out first in areas with less curvature, and then with greater curvature.

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