As we all know, car bumpers mainly play a protective role. However, today's car bumpers are mostly made of plastics. Some people are very puzzled about this. Plastic bumpers are soft and can provide protection. Will it affect the safety performance of the vehicle? Is the plastic bumper really unsafe? Don't worry, let's see if we can analyze the safety of plastic bumpers from a professional perspective. The role of car bumpers The automobile bumper is a safety device that absorbs and mitigates external impact and protects the front and rear parts of the vehicle body. Selection of car bumper materials In the early days, the front and rear bumpers of automobiles were mainly made of metal materials. They were generally stamped and made of steel plates, riveted or welded together with the frame rails. This design has a large gap with the body and it looks very unattractive. With the development of the automotive industry, and the constant pursuit of harmony and unity with the body shape, the pursuit of lightweight design itself, the final car manufacturers have found a better alternative - plastic bumpers. Use of plastic car bumpers It was Fiat that used the plastic bumper for the first time. Since then, this money-saving scheme has been quickly followed by major auto companies. Although many people think that the plastic bumpers used in automobiles are not strong enough and safe, and there are suspicions for cutting corners and materials, major car companies still insist on using plastic materials to create bumpers. There are many reasons for this. First, the cost of control is easy to design and produce The automobile production has been moulded. In addition to the body's use of high-strength materials, many parts will use engineering plastics as much as possible. The front and rear bumpers of the car are typical representatives. , Plastic bumpers can not only save manufacturing costs, but also have lower requirements on the industrial level and are easier to produce. Therefore, after the cost of building a car is controlled, the price of the final product to the consumer will be more reasonable, which must be corresponding. Second, more energy can protect pedestrians Automobile's rigidity is not borne by the bumper, mainly depends on the body frame structure, so in addition to the design and manufacturing costs, plastic insurance can also play a role in protecting pedestrians. The plastic bumper is more elastic than metal and better absorbs impact due to the material. So we can often see such pictures of bicycles crashing into the bumper on the Internet. If we think about replacing a metal bumper, then the tragedy is likely to be pedestrians and bicycles. Third, flexibility can avoid small bumps If there is a slight collision or scraping, the plastic bumper has good elasticity and has a certain impact resistance, which means that if the bumper is touched, the plastic bumper will automatically rebound and automatically repair. Even if it is painted off, it is always stronger than recessed. After all, spray painting is much cheaper than sheet metal repair. Fourth, anti-corrosion For the car body, we all know that the metal easily rusts when it is combined with water and air, which not only affects the appearance, but also has certain safety risks. However, although the bumper is a part that is easy to bump in daily driving, the plastic has good corrosion resistance and we do not need to worry about it. Therefore, automotive rigidity is not measured by bumper stiffness. The use of plastic bumpers not only serves to protect pedestrians, but also makes comparisons for future maintenance. It can be said that both buyers and sellers benefit.
In the past, the use of magnesium alloy die castings was relatively small, and now it is slowly increasing. Because magnesium alloys have the characteristics of low density and strong rigidity, many parts of shells and brackets use magnesium die castings. For example, the fast-developing mobile phones and notebook computers in recent years often use magnesium die casting for the support frame and the back shell. However, compared with aluminum alloy die casting and zinc alloy die casting, the cost of magnesium alloy die-casting will be relatively high.
The melting point of magnesium alloy is relatively low, and it needs effective gas protection during die casting, which is easy to oxidize and burn. Therefore, the professionalism of die casting is relatively strong, and the requirements for die casting personnel are generally relatively high. SCZY has professional and technical personnel for die-casting magnesium alloy products to ensure the quality of the products. Including one-stop services such as precision CNC machining and surface treatment provided later.
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