The front and rear ends of the car are equipped with bumpers, which not only have decorative functions, but more importantly, are safety devices that absorb and mitigate external impact forces, protect the body and protect the body and occupants.
In the past, the front and rear bumpers of automobiles were mainly made of metal materials. They were stamped into U-shaped channel steel with a thickness of more than 3 mm, and the surface was chrome-plated. The gap, as if it was an attached part, looked very unsightly.
Bumper With the development of the automobile industry and the large-scale application of engineering plastics in the automobile industry, the automobile bumper, as an important safety device, is also on the road of innovation. At present, in addition to maintaining the original protective function, the front and rear bumpers of automobiles should also pursue harmony and unity with the body shape, and pursue their own lightweight.
The outer plate and buffer material are made of plastic, and the 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 beam, and the beam is screwed with the frame longitudinal beam. Remove it. The plastic used in this plastic bumper is generally made of polyester and polypropylene materials, which are made by injection molding. For example, the bumper of the Peugeot 405 sedan is made of polyester material and made by reaction injection molding. The bumpers of Volkswagen's Audi 100, Golf, Santana, Xiali and other models are made of polypropylene materials by injection molding. There is also a kind of plastic called polycarbonate, which is infiltrated with alloy components. Using the method of alloy injection molding, the processed bumper not only has high strength and rigidity, but also has the advantage of being welded, and has good coating performance. More and more are used in cars.