The outer plate and buffer material are made of plastic, and the cross beam is stamped with a cold-rolled sheet with a thickness of about 1.5 mm to form a U-shaped groove; the outer plate and buffer material are attached to the cross beam, and the cross beam and the frame longitudinal beam can be connected by screws at any time Disassemble it. The plastic used in this plastic bumper is generally made of two types of materials, polyester and polypropylene, and made by injection molding. For example, the bumper of the Peugeot 405 is made of polyester-based materials and made by reaction injection molding. The bumpers of Volkswagen's Audi 100, Golf, Shanghai's Santana, Tianjin's Xiali and other models are made of polypropylene by injection molding. There is also a kind of plastic called polycarbonate series abroad, which infiltrates alloy components and adopts alloy injection molding method. The processed bumper not only has high strength and rigidity, but also has the advantage of being weldable, and has good coating performance. The usage on cars is increasing.