Internal high-pressure formed auxiliary frame and forming method thereof

Abstract

The invention relates to an internal high-pressure formed auxiliary frame and a forming method thereof. The auxiliary frame has a groined main structure and is formed by welding two longitudinal beams (5 and 19), a front cross beam (3) and a back cross beam. The longitudinal beams (5 and 19) have an internal high-pressure formed cast structure, wherein the cross section thereof is of an irregular shape with a small middle part and two big ends. The internal high-pressure forming method comprises the following steps of: (1) bending a pipeline; (2) flattening a workpiece; (3) hydroforming; (4) scraping edges and processing an auxiliary hole; and (5) washing and treating the surface. The internal high-pressure formed longitudinal beams and the front cross beam can be prevented from being formed by welding upper and lower two stamping parts, so that the materials are saved, the design space is obtained and a light, high-strength, high-precision, energy-saving auxiliary frame device is formed.

Description

technical field [0001] The invention relates to an automobile auxiliary frame and an internal high-pressure forming method thereof. Background technique [0002] At present, the traditional automobile sub-frames are all welded by stamped and formed sheet metal parts. Based on this traditional structure, there are the following problems: [0003] In the process of automobile design, due to the power layout (horizontal, longitudinal), suspension structure, power system and clearance requirements of the sub-frame, it is difficult to arrange the traditional sub-frame. The traditional sub-frame longitudinal beam adopts The stamped upper and lower pieces are welded. Sometimes in order to increase the strength of the subframe, an auxiliary reinforcement bracket needs to be added between the upper and lower pieces. This increases the development mold of the subframe, increases the design and development cycle and manufacturing costs. It also causes a huge waste of moulds, which is ...

AI Technical Summary

Problems solved by technology

[0003] In the process of automobile design, due to the power layout (horizontal, longitudinal), suspension structure, power system and clearance requirements of the sub-frame, it is difficult to arrange the traditional sub-frame. The traditional sub-frame longitudinal beam adopts The stamped upper and lower pieces are welded. Sometimes in order to increase the strength of the subframe, an auxiliary reinforcement bracket needs to be added between the upper and lower pieces. This increases the development mold of the subframe, increases the design and development cycle and manufacturing costs. It also causes a huge waste of molds, which is not conducive to reducing the weight of the vehicle to a certain extent

[0004] In the process of automobile manufacturing, the increase of parts due to the need for strength of the traditional sub-frame will inevitably lead to the increase of molds, positioning tooling, and welding fixtures, which is not conducive to mass production

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