Many years ago, the front and rear bumpers of automobiles were mainly made of metal materials. Steel plates with a thickness of more than 3 mm were stamped into U-shaped channel steel. The surface was treated with chrome plating. They were riveted or welded to the frame longitudinal beams and had a relatively long section with the body. The large gap looks like an additional component and looks very unsightly.

　　Bumper With the development of the automobile industry and the extensive application of engineering plastics in the automobile industry, automobile bumpers, as an important safety device, are also on the road to innovation. At present, in addition to maintaining the original protective function, the front and rear bumpers of automobiles must also pursue harmony and unity with the body shape and pursue their own lightweight. The front and rear bumpers of cars are made of plastic, which are called plastic bumpers.

　　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 is screwed to the frame longitudinal beam and can be used at any time. Disassembled. The plastic used in this kind of plastic bumper is generally made of polyester and polypropylene materials and is made by injection molding. There is also a type of plastic called polycarbonate in foreign countries, which is infiltrated with alloy components and adopts the 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 painting performance. It is increasingly used in cars.

　　The geometric shape of the bumper must not only be consistent with the shape of the entire vehicle to ensure aesthetics, but also comply with the mechanical properties and energy-absorbing properties to ensure vibration absorption and buffering during impact. Ensure that the safety performance of the vehicle is guaranteed to a certain extent.

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