In automobile manufacturing, the largest number of cold-drawn profiles are used for trucks and large passenger cars. They are mainly used to make carriage frames, wallboards, floor panels, body frames, bottom beams and door and window frames. The situation of medium bus is similar to that of large bus. Small cars use many kinds of specifications, and most of the cross-sections are more complex, size accuracy requirements are stringent.
For heavy trucks (including light trucks), the number of cold-drawn profiles used in the carriage is the largest. According to different models, the structure of the car is different. For example, the wallboard and the frame of the carriage of some models are integral and the components are of the same thickness, while the wallboard and the frame of the carriage of some models are separate components, and the thickness of the two components is different.