Must the car be equipped with a bumper?
The front and rear ends of the car are equipped with bumpers, which not only have decorative functions, but also are safety devices that absorb and mitigate external impact forces, protect the body and protect the body and occupant safety functions.
In the past, 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 large gap with the body. It seems that an attached component looks very unattractive. However, with the development of the automotive industry and the extensive application of engineering plastics in the automotive industry, automobile bumpers have also entered the path of innovation as an important safety device. At present, in addition to maintaining the original protection function, the front and rear bumpers of the car must pursue harmony and unity with the shape of the car body, and pursue its own lightweight. The front and rear bumpers of the car are made of plastic and are known as plastic bumpers.
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, and can be attached at any time. Remove it. Plastics used in such plastic bumpers are generally made of two types, polyester and polypropylene, and are injection molded. 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 processed bumper not only has high strength rigidity, but also has the advantage of being weldable, and the coating performance is good. The use of cars is increasing.
The bumper has the functions of safety protection, decorating the vehicle and improving the aerodynamic characteristics of the vehicle. From the safety point of view, when a car has a low-speed collision accident, it can play a buffering role to protect the front and rear body; it can play a role in protecting pedestrians in the event of an accident with pedestrians. From the appearance, it is decorative and has become an important part of the decoration of the car. At the same time, the car bumper has a certain aerodynamic effect.
At the same time, in order to reduce the damage to the occupant when the car is in a side collision accident, a door 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.