Preparation method of stamping part

Abstract

The invention discloses a manufacturing method of a stamping part. The manufacturing method comprises the following steps that a blank is stamped to form a preformed part; the preformed part is placed in an acid electroplating solution to be electroplated for the first time; and placing the preformed part subjected to the first electroplating in an alkaline electroplating solution for second electroplating. According to the scheme, it can be guaranteed that the preformed part has high corrosion resistance and good cold bending performance, meanwhile, the thickness of a plating layer on the surface of the preformed part can be uniform through the method, and the welding performance of the preformed part in the later procedure is not affected.

Description

technical field [0001] The invention relates to the technical field of stamping and forming, in particular to a preparation method of stamping parts. Background technique [0002] At present, with the requirements of lightweight automobiles, the application of high-strength and ultra-high-strength steels in automobile bodies is becoming more and more extensive. At the same time, in order to improve the safety performance of the automobile body, the stamping parts used to prepare the body-in-white usually have higher corrosion resistance and better cold bending performance (the cold bending angle of the metal material can be determined by the cold bending test, the test When the first crack appears on the sample, the angle is called the cold bending angle. The cold bending angle can characterize the plasticity of the metal material. The larger the bending angle, the better the plasticity of the material, that is, the better the cold bending performance.) and other requiremen...

AI Technical Summary

Problems solved by technology

However, most of the ultra-high-strength steel sheets currently used for cold stamping and hot stamping are martensitic steel sheets. The parts formed by cold stamping of martensitic steel sheets have a cold bending angle of about 70°. Martensitic steel sheets are formed by hot stamping. For parts, the cold bending angle is between 60° and 70°, and the commonly used method of galvanizing on the steel plate is alkaline electroplating, which will further reduce the cold bending performance of the parts and reduce the cold bending angle by 10° to 20°

Therefore, it is difficult to make automobile body parts with high corrosion resistance and good cold bending performance by traditional methods

In addition, since the stamped parts are special-shaped parts with complex shapes, the problem of uneven coating thickness is prone to occur during the electroplating process, which makes the edge of the parts prone to thicker coatings, which is not conducive to the post-processing of the parts. welding

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