Car bumpers are safety devices that absorb and mitigate external impact forces and protect the front and rear of the body. Twenty years ago, the front and rear bumpers of the car were mainly made of metal materials. They were stamped into U-shaped channel steel with a steel plate with a thickness of more than 3 mm. The surface treatment was chrome-plated. The large gap seems to be an additional component.
With the development of the automobile industry, automobile bumpers, as an important safety device, are also on the road to innovation. In addition to maintaining the original protection function, the front and rear bumpers of today's cars also need to pursue harmony and unity with the body shape, as well as their own lightweight. In order to achieve this, plastics are used in the front and rear bumpers of cars, and people call them plastic bumpers.
The plastic bumper is composed of three parts: the outer plate, the cushioning material and the beam. Among them, the outer plate and the buffer material are made of plastic, and the beam is stamped into a U-shaped groove with a cold-rolled thin plate with a thickness of about 1.5 mm; the outer plate and the buffer material are attached to the beam, and the beam is connected to the frame longitudinal beam screws. Can be disassembled at any time. The plastic used in this plastic bumper is basically made of two materials, polyester and polypropylene, and is made by injection molding. For example, the bumper of the Peugeot 405 sedan uses polyester materials and is made by reaction injection molding. The bumpers of Volkswagen's Audi 100, Golf, Santana in Shanghai, and Xiali in Tianjin are made of polypropylene by injection molding. There is also a kind of plastic called polycarbonate system in foreign countries, which is infiltrated with alloy components and adopts the method of alloy injection molding. The processed bumper not only has high strength and rigidity, but also has the advantage of being weldable, and has good coating performance. The amount of usage in cars is increasing.
The plastic bumper has strength, rigidity and decoration. From a safety perspective, the car can play a buffering role in the event of a crash to protect the front and rear body; from the appearance, it can be naturally combined with the body of the car It is integrated and has good decorativeness, and becomes an important part for decorating the appearance of cars.
In addition, in order to reduce the damage to the occupants in the event of a side collision of the car, a door bumper is usually installed on the car to enhance the impact resistance of the door. This method is practical and simple, with little changes to the body structure, and has been widely used. As early as the '93 Shenzhen International Automobile Exhibition, the participating Honda Accord cut a part of a door, and exposed the door bumper to the audience to show its good safety performance.
Installing the door bumper is to place several high-strength steel beams horizontally or diagonally in the door panel of each door, which acts as a front bumper and a rear bumper. , Forming a "copper wall and iron wall", so that the passengers of the car have a maximum safety area. Of course, the installation of this kind of door bumper will undoubtedly increase some costs for car manufacturers, but for the passengers of the car, the safety and sense of security will increase a lot.