The front bumper of the car is a safety device that absorbs the external impact and protects the front and rear of the body. 20 years ago, the front and rear bumpers of the car were mainly made of metal materials, and were punched into U-shaped channel steel with a thickness of 3 mm or more. The surface was treated with chrome plating, riveted or welded with the frame rails, and there was a section with the body. The larger gap seems to be an attached component.
With the development of the automotive industry, the front bumper of the car has also entered the road of innovation as an important safety device. In addition to maintaining the original protective function, the front and rear bumpers of today's cars must pursue harmony and unity with the body shape and pursue their own lightweight. In order to achieve this goal, the front and rear front bumpers of the car are currently made of plastic, which is called a plastic front bumper. The plastic front bumper is composed of three parts: outer plate, cushioning material and beam. The outer plate and the cushioning material are made of plastic, and the beam is stamped into a U-shaped groove by a cold-rolled sheet having a thickness of about 1.5 mm; the outer plate and the cushioning material are attached to the beam, and the beam is screwed to the frame longitudinal beam. Can be removed at any time. The plastic used for this plastic front bumper is mainly made of a polyester-based and a polypropylene-based material and is injection-molded. For example, the front bumper of the Peugeot 405 sedan is made of polyester-based material and is formed by reaction injection molding.
The front bumpers of Volkswagen's Audi 100, Golf, Santana in Shanghai, and Xiali in Tianjin are made of polypropylene-based materials by injection molding. There is also a kind of plastic called polycarbonate in foreign countries. It is infiltrated into the alloy composition and is alloy injection molding. The front bumper is not only has high strength rigidity, but also has the advantage of being welded, and the coating performance is good. , the use of more and more cars.
The plastic front bumper has strength, rigidity and decoration. From the safety point of view, when the car collides, it can play a buffering role to protect the front and rear body. From the appearance, it can be naturally combined with the car body. Integral, with good decoration, has become an important part of the decorative car exterior.
In addition, in order to reduce the damage to the occupant when the car is in a side collision accident, a front bumper is usually installed on the car to enhance the anti-collision impact of the door. This method is practical and simple, and has little change to the structure of the vehicle body. It has been widely used. As early as the '93 Shenzhen International Automobile Exhibition, the Honda Accord exhibited a part of the door to expose the front bumper to the audience to show its good safety performance.