Why car bumpers use plastic parts

2019-12-23

Whether it is Mercedes-Benz BMW Audi or Changan Jili BYD, tap the bumper with your hand, hey? How is it plastic? Is it safe to make a bumper from plastic? Originally called a bumper, how can the material of plastic be used for insurance? But look at the crash test results, even if the bumper is plastic, the crash results can still reach 5 stars. How did this happen? The bumper is an exterior cover of the front part. The original bumper material was indeed metal, but it was later found that it was more suitable to replace plastic with metal.

Protect pedestrians

Suppose someone is driving at a speed of 40km / h and a pedestrian accident suddenly occurs on the front. At this time, the driver prefers that his bumper be plastic or metal? Can't wait for the entire front part to be made of cotton? For cars running on the road, even a very expensive luxury car, the front bumper can feel a certain contraction by pressing it with one hand. This design is designed to give the pedestrian a bumper when the vehicle collides with the pedestrian. A force cushion. Since the pedestrian's head is likely to come into contact with the front cover when hitting a pedestrian, the front cover of most cars is not hard.

Not bad security

The crash test video of the IIHS in the United States is also a recognized authority for crash test. When the speed of the vehicle was about 64km / h, the bumper was shattered when it hit 25% of the front and hit an obstacle. Let ’s not raise the bar, everyone may wish to make up for it, even if it is replaced with a thin layer of metal, it will not play any role at all. Even reaching a thickness of cm will not have much impact on the results.

cost

Using plastic as the main material can greatly reduce manufacturing costs and maintenance costs. What is the price of plastic and metal? No doubt about it. The relative cost of plastic is relatively low and it is easy to shape. Moreover, plastics are also divided into many types. The materials used in car bumpers are relatively high in elasticity. If there is not a serious collision, the bumpers will spring back to their original shape, just like pinching a mineral water bottle. If it is metal, then there is no way out. It can only be removed for sheet metal treatment. The maintenance cost is not generally high. You don't want to spend a piece of paint without a piece of paint.

Corrosion resistance

Metals that do not spray paint will rust if exposed to the air for a long time. Metals that do not rust are more expensive, such as aluminum, gold, platinum, etc. Is the cost of bumpers too high? However, plastic is used instead. Not only is the cost low, but the plasticity is higher. You don't have to worry about rusting after scratching. Even if you don't have time to repair and repair, the problem is not big.

weight

I have to admit that metal is much heavier than plastic. Iron with a thickness of one square meter will weigh about 78KG, which is equivalent to an adult. The car is heavy, and it has an impact on acceleration, handling, and fuel consumption, especially the brakes. I still say that, shorter distances to avoid danger, but bump into a solid bumper, but which one do you choose?

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