With the development of automobile industry and the wide application of engineering plastics in automobile industry, automobile bumper as an important safety device has also embarked on the road of innovation. At present, in addition to maintaining the original protection function, the front and rear bumpers of automobiles also pursue harmony and unity with body modeling and their own lightweight. The front and rear bumpers of cars are all plastic, which we call plastic bumpers. Among them, the outer plate and buffer material are plastic, and the cross beam is stamped into a U-shaped groove from a cold-rolled plate with a thickness of about 1.5mm; An outer plate and a buffer material are attached to the cross beam, and the cross beam and the frame longitudinal beam are fixed together with screws and can be disassembled at any time. The plastics used in this plastic bumper are mainly polyester and polypropylene, and are injection molded. For example, the bumper of Peugeot 405 car is polyester, which is reaction injection molded. There is also a kind of plastic abroad called polycarbonate, which is made by infiltration of alloy components and injection molding of alloy. The processed bumper not only has high strength and stiffness, but also has weldability and good painting performance, which is widely used in automobiles.
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