A kind of preparation method of sheet metal parts with different thickness of foamed metal

Abstract

The invention relates to a preparation method for a foam metal thickness difference sheet metal part. The preparation method for the foam metal thickness difference sheet metal part is characterized in that 1, firstly, at least two metal plates are stacked, and a foaming agent is sprayed on the contact face of the two metal plates; 2, then the two metal plates are rolled for the first time through rolling equipment to obtain once rolled metal plates each with an area to be foamed; 3, each once rolled metal plate is partitioned into two blocks from the area to be foamed; 4, the two once rolled metal plates are stacked to be rolled for the second time to obtain a foam metal plate with an area to be foamed; 5, the foam metal plate is placed in a heating furnace to be preheated to obtain a foam metal plate with a foaming area; 6, the preheated foam metal plate is placed in a stamping die to be heated until the foaming area reaches a foaming temperature; 7, the foam metal plate reaching the foaming temperature is subjected to hot stamping forming through the stamping die, meanwhile, pressure maintaining is performed to complete the secondary foaming of the foaming area, and then the foam metal thickness difference sheet metal part is obtained. The prepared foam metal thickness difference sheet metal part prepared by the preparation method for the foam metal thickness difference sheet metal part can meet performance requirements of parts of different portions, and the impacting energy absorption effect of the sheet metal part is improved by more than 40%.

Description

Technical field [0001] The invention relates to a method for preparing a foamed metal sheet metal piece with difference in thickness, which belongs to the field of automobile parts processing. Background technique [0002] For the car body, in order to improve the crash safety performance, high-strength metal plates of equal thickness are generally used to prepare the body sheet metal parts. However, such a body structure design is not conducive to weight reduction, and will increase the fuel consumption of the car, causing environmental pollution. Therefore, with the intensification of the energy crisis and environmental problems, the lightweight technology of automobiles has become an important measure to reduce fuel consumption and reduce exhaust pollution. There are two main ways to reduce the weight of automobiles: one is to reduce the weight of parts and materials, and the other is to optimize the structure of parts. The former is more direct and has obvious effects. [000...

AI Technical Summary

Problems solved by technology

At present, there are two types of differential thickness sheet metal parts used to manufacture lightweight body parts: one is TWB sheet metal parts (Tailor Welded Blanks, tailor-welded blanks), and its preparation method is to weld at least two flat materials of different thicknesses. Together and stamped to obtain sheet metal parts that meet the performance requirements of parts in different parts; and another type of TRB sheet metal parts (TailorRolled Blanks, continuously variable cross-section plates), is to obtain TRB plates through a flexible rolling process, and then Stamping is used to obtain TRB sheet metal parts with poor thickness. Due to the heavy weight of the metal sheet metal parts prepared by the existing process, it cannot well meet the lightweight requirements of the car body, and the grain refinement of the metal sheet metal parts is not enough, resulting in a lower tensile strength. Can not meet the requirements of use

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