Automobile cover (panel for short) refers to the automobile parts that constitute the automobile body or cab and cover the surface and interior of the engine and chassis. Automobile panel is not only a decorative part, but also a bearing part in the shape of a closed thin shell. Any tiny defect on the surface of the cover will cause diffuse reflection of light after painting and damage the appearance of the cover. Function of automobile side panel: 1. Dawei, the outer spoiler of the car body, originated from racing cars. The main function is to reduce the reverse airflow generated when the car is driving, and at the same time increase the downward pressure of the car, so that the car is more stable when driving at high speed. But when it comes to the general coaming of civil vehicles, it no longer pays attention to functionality, but emphasizes the aesthetic coordination and personalization of appearance; 2. In today's pursuit of individuality, the large envelope, which has many changes in appearance, convenient installation and the easiest to see, has gradually become the first choice for car owners; 3. The function of fender is to reduce the drag coefficient by fluid mechanics, so that the car can run more smoothly. The front fender is mounted on the front wheel. Because the front wheel has steering function, it is necessary to ensure the maximum limit space when the front wheel rotates.