What are the four major processes of automobile manufacturing?

The technological work of automobile manufacturing mainly includes stamping process, welding process, painting process and assembly process, commonly known as the "four major processes" of automobile.

Stamping is the first step of all processes, and each workpiece usually goes through several processes to complete. It is realized by punching machine and die.

Stamping parts of plates, molds and equipment are usually made of low carbon steel. Most of the frame parts and covering parts of the car body are stamped from steel plates. The special steel plate for car body has the characteristics of delayed stretching and not easy to crack. Depending on the position of the car body, some parts are rusted by galvanized steel plates, such as fenders and roofs.

High-strength steel plates are used in some high-stress parts, such as radiator support beams and upper side beams. The thickness of steel plates commonly used in car body structure is 0.6~3mm, the thickness of most outer plates is 0.6~0.8mm, the thickness of inner plates is 1.0~ 1.8mm, and the thickness of reinforcing plates is 2.0 ~ 2.5 mm ..