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.

车身安装在底盘的框架上，由驾驶员和乘客携带或装载。公共汽车主体通常是整体结构，而卡车主体通常由驾驶室和集装箱组成。

许多车主认为，喷涂钣金零件后需要使用相同颜色的汽车漆，因此在选择钣金零件时会忽略钣金零件的喷涂过程，认为这并不重要，但是这种想法是不正确的。为了防止氧化和生锈，钣金零件在出厂前需要进行喷涂。确实，更换钣金零件后的喷涂连接件不仅可以色调其颜色，而且还可以保护并防止氧化。

​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.