Cold bending forming process for camber beam of car body of passenger car

Abstract

The invention relates to a cold bent forming process for a camber beam of a car body of a passenger car. In the process, one-step bending forming can be realized by improving a mold and controlling bending and stretching. The camber beam of the car body of passenger car, which is prepared by the bending forming process provided by the invention, has high performance and high strength and has no wrinkles on surface and no risks of welding failure.

Description

technical field [0001] The invention relates to a cold-bending forming process of profiles, more specifically, the invention relates to a cold-bending forming process of a curved beam of a passenger car body. Background technique [0002] The curved beam of the car body is an important part of the steel structure of the bus roof. Its size and shape directly affect the assembly performance and appearance of the bus roof. The shape of the curved beam is characterized by a hat-shaped beam with a circular arc. During the rolling process, the rebound of the material will easily cause the size of the arc to be difficult to control, and the arc of the beam will cause the skirt part to be uneven and upturned. The material Flow and forming properties are more complex. For a long time, the passenger car curved beam is usually manufactured by hot rolling or welding. Welding is used, due to potential welding failure and low bonding strength at the weld, there is a risk of fracture fai...

AI Technical Summary

Problems solved by technology

[0003] 1. Due to the limitation of hot rolling process, the material consumption per unit area is large

[0004] 2. The production equipment required in the hot rolling process is huge, with few varieties and specifications, and each order must reach a certain quantity before production, and the production cycle is long

[0005] 3. Hot rolling is made by heating metal or alloy blanks at high temperature and then rolling them. Therefore, the energy consumption is high and the process is complicated. In today's energy shortage situation, the disadvantages are more obvious

[0006] 4. Due to high energy consumption and complex processing technology, the production cost is high and the price is high

[0009] The inventors of the present invention found that the passenger car curved beams pressed by the molds in the prior art did not meet the requirements of the drawings, resulting in difficulty in dimensional control during the roof assembly process and poor roof flatness, low stretching efficiency, and easy damage to the profile cause damage

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