Why are the front bumpers of the car plastic, not iron?
The metal front bumper has many drawbacks, such as it is difficult to repair after an accident, the collision force is relatively large in the event of an accident, the vehicle is more affected by the collision, and the impact on the person is greater in the accident of the automobile and the person. The bumper increases the weight of the car, increases the fuel consumption of the vehicle, etc., so this metal front bumper is destined to be eliminated.
At present, the front bumper of the automobile is made of toughened (modified) polypropylene (PP) material as a raw material for injection molding (polypropylene (polypropylene) plastic, commonly known as PP material). This material has light weight, good corrosion resistance and good products. The strength and rigidity are better. The disadvantage is that the low temperature resistance is poor. The blended modified material consists of three kinds of impact resistant PP copolymer, styrene elastomer and polyolefin rubber. It has high rigidity, impact resistance and resistance. Scratch and paintability, after the bumper is loaded, the bumper is not broken by 8 km/h, and has the elasticity of recovery. The performance is similar to that of PU, and the cost is reduced by 10%~20%).
Advantages of plastic front bumper:
Plastic material reduces vehicle weight
Plastic front bumper can act as a cushion at low speed collisions
Plastic front bumper is easy to repair
Most modern car front bumper casings are made of plastic or fiberglass. In order to reduce the cost of trial production, save the cost of mold production, and also to shorten the trial production cycle, consider the use of FRP glass fiber reinforced epoxy hand lay-up process in the trial production of the concept car. The material of the front bumper is generally PP+EPEM+T20, or PP+EPDM+T15. EPDM+EPP is also more versatile. It is rare to use ABS and more expensive than PP. The thickness of the front bumper is usually 2.5-3.5mm, and the gas-assisted molding can be made thinner.