Is the bumper changing from metal to plastic because of cutting corners?

- 2021-12-08-

Early bumpers were made of metal, but later replaced with plastic.


In this early car, the front bumper and the rear bumper were really stamped out of this kind of steel plate of metal material, and they were connected to the frame. It felt like an armored car or a tank, and I felt that it was safer. 


Later it was slowly replaced with plastic bumpers. Fiat was the first to do this, and other brands followed.


At that time, consumers were already wondering, if you replace steel with plastic, can it be as safe as before? Is it a bit too much to cut corners? I'm joking about the lives of our car owners. After checking the information, it was really not the case. 


Metal to plastic has stronger impact resistance.


Bumper is a system, not a separate shell. The real bumper consists of the outer shell of the bumper, the inner anti-collision beam, and the two energy-absorbing boxes on the left and right sides of the anti-collision beam. All other components are added together to form one. A complete bumper, or a safety system.


The outermost shell mainly acts as a buffer in low-speed collisions and this kind of scratches, and its own ability to resist impact is actually not particularly strong.


It is like a hammer. This hammer hits the energy-absorbing box of our car, and then transmits it to the two longitudinal anti-collision beams at the back, so that we are safer.


From metal to plastic, it absorbs better energy, but is safer


Now it is equivalent to turning this steel iron hammer into a plastic hammer, and the striking force will be less. Because it is a plastic bumper, it will deform and bend when it encounters an impact, absorbing a certain amount of collision energy.


Then there are the two longitudinal beams behind the bumper. This is the most important one. It bears about 60% of the total collision energy. As long as the structure is well designed, this 60% can be continuously raised, because it involves the transmission of that force.


Therefore, replacing this bumper with a plastic one will increase the safety instead of reducing it. This was something I was more surprised by. I used to think it was almost the same.


Metal becomes plastic, car body cost is reduced


Then, for the plastic used, it is obvious that the price of the car can be lowered, and the cost can be reduced. This is also what we complained about at the beginning. We felt that we bought fewer things for the same money, right.


It is also a protection for pedestrians outside the car


The replacement of the bumper with plastic has another function that not only protects the occupants in the car, but also protects the pedestrians outside the car.

This is the example of the iron hammer I just mentioned. Just now, I used this iron hammer to hit the impact resistance mechanism in our car. Now it is the person who uses this iron hammer to hit the road.


You hit it, then knock it with an iron hammer, and knock it to death, knock it with a plastic hammer, maybe there is still a chance. This is considered an additional benefit.


Metal to plastic, low maintenance cost


The metal is scraped off immediately, and the plastic is scraped off. The use of plastic bumpers instead of metal bumpers is the biggest and greatest significance in our daily use, which is the low maintenance cost. How do you say this?


Metal objects will rust in a humid environment, but plastics will not rust. We scrape off some paint today. If you are metal, you must repair it. Either paint it again or put on a waterproof sticker, but the plastic is scratched off. As long as I dont find it ugly, it doesnt matter if I keep it on.


Plastic replacement is also cheaper than metal replacement


Besides, my bumper crashed and I need to replace it. Obviously, the plastic one is much cheaper than our steel one. The bumper itself is also heavy. Although it can be said to be negligible, the amount is still acceptable. Let us spend less on gas.


The bumper is changed from metal to plastic. Generally speaking, it is beneficial to our car owners and car manufacturers. The price is cheaper, more durable, easier to repair, and the safety is better than the original one. 

After knowing about the above bumper knowledge, Let us have a look the bump metal mould.