Generally speaking, the working rhythm of stamping machine determines the production rhythm of stamping production line. The working time of the feeding and unloading mechanism and the workpiece conveying mechanism of the stamping production line should coincide with the stamping time of the stamping machine tool. In order to reduce or eliminate the assistant time of punching machine and die as much as possible, the loading and unloading device of sheet metal and the transport mechanism of workpiece must be able to complete the tasks of loading and unloading and conveying of workpiece as soon as possible so as to reduce the downtime of punching production line.

The body is mounted on the frame of the chassis and is carried or loaded by the driver and passengers. The bus body is generally an integral structure, and the truck body is generally composed of cab and container.

Many car owners believe that the same color of car paint is needed after the sheet metal parts are sprayed, so the spraying process of sheet metal parts will be neglected in the selection of sheet metal parts, thinking that it is not important, but this idea is incorrect. In order to prevent oxidation and rust, sheet metal parts need to be sprayed before they leave the factory. Indeed, the spraying links after replacing sheet metal parts can not only tone their colors, but also protect and prevent oxidation.

​Body straightening refers to the process of repairing parts damaged by accident or fatigue to the "state" of the technical standard when the vehicle leaves the factory through a certain external force.