Automotive sheet metal is a processing method of automobile maintenance, also called cold working. To put it bluntly, if the appearance of the car body is damaged and deformed, the sheet metal process is needed. Automobile collision repair has developed from the initial "welding repair" to the secondary manufacturing and assembly of the car body.

The repair of vehicles in collision accidents is no longer a simple automotive sheet metal knock, and the quality of repair can not be observed only by naked eyes.

Maintenance personnel should not only know the technical parameters and dimensions of the car body, but also master the characteristics of the car body material, the transmission of force characteristics, the deformation trend and stress points of the car body and the production technology of the car body such as welding technology.

On the basis of mastering this knowledge, maintenance personnel should also use advanced measuring tools and accurate three-dimensional measurement of the car body to judge the direct and indirect damage and deformation of the car body and the hidden dangers caused by the car body deformation, and formulate a complete car body repair plan.

Then through the correct maintenance technology and accurate three-dimensional data of each key point, the key points of the car body will be restored to their original positions and the damaged car body will be restored to the factory state.

Extended data:

In automobile manufacturing and maintenance, the shapes of many sheet metal structures are very complicated. In order to avoid the difficulty of sheet metal, sheet metal materials must have good technological performance requirements, namely:

1, the sheet metal material must have good plasticity. Must have the ability to produce permanent deformation under the action of external force without being destroyed. For cold-worked parts, good cold plasticity is required, such as stamping parts of automobile parts; For hot working parts, good thermoplasticity is required, such as hot forgings, spring steel plates, hot rivets, etc.

2. Good weldability. Many automobile sheet metal parts are welded together by spot welding, oxygen welding, arc welding or gas shielded welding, so it is required that the sheet metal parts must have good welding performance. This is especially important in automobile maintenance and repair. Materials with good weldability have high welding strength and low cracking tendency.

3. Low price, economy and practicality. For any part of an automobile, the economy should be considered under the condition of meeting the working conditions. You can use ferrous metals instead of nonferrous metals; If you can use non-ferrous metals, never use precious metals. The service life of automotive sheet metal parts should be compatible with the service life of other automobile parts.

4. Good chemical stability. Most automobile panels work outdoors, often in contact with water and steam, especially mufflers, and often work at high temperatures and corrosive gases. This requires that sheet metal parts must have good chemical stability, which requires not only strong corrosion resistance and rust prevention ability at room temperature, but also that they will not be corroded or deformed at high temperature or in the sun.

5. Good dimensional accuracy and internal quality of the plate. The dimensional accuracy and internal quality of sheet metal have great influence on sheet metal processing, especially on molded parts.

Baidu Encyclopedia-automotive sheet metal