As we all know, many car owners will refer to the old driver when they buy a car. Generally, the old driver will give a suggestion, that is, try to buy a car with a thicker body, so it will be safer. Therefore, when most car owners go to 4S shop to choose a car, they will choose to consider this item. However, careful owners found that when introducing vehicles, 4S shop staff used the word "lightweight". Why? Whether the weight of the car is related to the safety or not, let's take a look together.

Let's give you a brief introduction first! uuuuuuuuuuu Lightweight is not equal to miniaturization, not only to reduce their own weight, but also safety, comfort, fuel economy can not be lower than the original model, and the cost and price can not be greatly improved. In the development of modern automobile industry, these two technologies are mainly used to achieve lightweight.

Moreover, automotive lightweight materials are divided into two categories: metal and non-metal. Metal materials mainly include high-strength steel and aluminum alloy, magnesium alloy and other non-metallic materials, including engineering plastics and composite materials. These new materials will encounter a variety of problems in practical application, such as the safety, comfort, power and maneuverability of replacement materials and automobiles. In fact, aluminium alloy material has many advantages, its density is 1/3 of steel, its elongation is good, corrosion resistance, easy recovery. Moreover, it has good castability and can be processed into different shapes. It is one of the most popular lightweight materials at present. At present, many models adopt all-aluminium body.

Indeed, taking aluminium alloy body as an example, the cost is on the high side, but with the future scale and technology maturity, the cost will be reduced. The main problem is maintenance after collision. Steel body, small collision deformation, knocking can directly restore the original shape, but the aluminum alloy body can not, because the formability of aluminum alloy at room temperature is very poor, knocking will only damage parts, heating can not guarantee the strength of cooling, so basically, after collision deformation, aluminum alloy parts need to be replaced, 10. It's troublesome and expensive.

In a word, the concept of lightweight originated from racing. Its purpose is to bring better maneuverability, and the engine output power can produce higher acceleration. Because the vehicle is light, the acceleration performance is better when starting, and the braking distance is shorter when braking. The vehicle weight can be reduced by 10% and fuel efficiency can be increased by 6%-8%. For every 100 kg reduction in vehicle weight, fuel consumption can be reduced by 0.3-0.6 liters and CO2 emissions can be reduced by about 5 g/km.