Which step is performed first for punching and bending of automotive stampings?

A large number of cold stamping processes are used in the production of automobile stamping parts, which is suitable for the needs of multi-variety and mass production of automobile stamping parts. In medium and heavy-duty vehicles, most of the cover parts such as body outer panels, and some load-bearing and support parts such as frame, carriage and other auto parts are auto stamping parts. The steel used for cold stamping is mainly steel plates and steel strips, which account for 72.6% of the steel consumption of the whole vehicle. The relationship between cold stamping materials and the production of automobile stamping parts is very close. The quality of the materials not only determines the performance of the product, but also directly affects the production. The process design of the automobile stamping process affects the quality, cost, service life and production organization of the product, so the rational selection of materials is an important and complex task.

Cold stamping of stamping parts, from a professional point of view, refers to the use of a die on a press to apply a certain pressure to the material to separate or plastically deform it, thereby obtaining the desired finished product. The two processes of punching and bending, generally speaking, are punched first and then bent to facilitate the fabrication of CNC punching machines. However, in some special cases, it is necessary to bend and then punch.

On stamping parts, the number of processes generally refers to the number of repetitions of processes of the same nature. Therefore, under the premise of ensuring the quality of stamping parts, the number of processes should be minimized, so as to improve the production efficiency of the workpiece and improve its economic benefits. Moreover, this requirement must be strictly implemented, and there should be no sloppy and lax actions to ensure the above-mentioned effects.

When selecting materials, first, according to the type of automobile stamping and the characteristics of use, metal materials with different mechanical properties are selected to achieve the purpose of not only ensuring product quality, but also saving materials.

Usually, the following principles should be followed when selecting materials for automotive stamping parts:

• a The selected materials should first meet the performance requirements of auto parts;
• b The selected material should have good process performance;
• c The selected material should have good economy.