What principles should be paid attention to in the selection of stamping parts?

2021-04-06 10:09:53

Automobile stamping parts, as the name suggests, are metal stamping parts of automobile parts. In the automotive stamping parts, some parts become automotive parts directly after stamping, and the other parts become automotive parts after welding, machining, or painting. There are many kinds of automobile stamping parts, such as spring tray, spring seat, spring bracket, end cover, cover, compression valve cover, compression valve sleeve, oil seal seat, bottom cover, dust cover, impeller, oil cylinder, lug, bracket and so on.

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 industry. In medium and heavy-duty vehicles, most of the covering parts such as body panel, and some load-bearing and supporting parts such as frame, carriage and other auto parts are stamping parts. The steel used for cold stamping is mainly steel plate and strip, accounting for 72.6% of the total vehicle steel consumption. Cold stamping materials are closely related to the production of automobile stamping parts. The quality of materials not only determines the performance of products, but also directly affects the process design of automobile stamping parts, and affects the quality, cost, service life and production organization of products. Therefore, reasonable selection of materials is an important task It's an important and complicated job.

Analysis on heat treatment of metal stamping die - metal stamping die is easy to crack after quenching, which causes die scrapping

1. There is serious carbide segregation in the original structure of die steel.

2. Poor forging process, such as too high forging heating temperature, small deformation, high stop forging temperature, slow cooling rate after forging, makes the forging structure coarse and has network, band and chain carbides, which is difficult to eliminate during spheroidizing annealing.

3. Poor spheroidizing annealing process, such as too high or too low annealing temperature, short isothermal annealing time and so on, can cause uneven microstructure or poor spheroidizing.

The metal stamping die is easy to crack after quenching, which causes the die scrapping

1. According to the working conditions of the die, the production batch and the strength and toughness of the material itself, select the high-quality metal stamping die steel.

2. Improve forging process or normalize preparation heat treatment to eliminate network and chain carbides and non-uniformity of carbides in raw materials.

3. The high carbon die steel with severe carbide segregation which can not be forged can be treated by solution refining heat treatment.

4. To make correct spheroidizing annealing process specification for forged die blank, quenching and tempering heat treatment and rapid uniform spheroidizing annealing can be used.

5. Charge the furnace reasonably to ensure the temperature uniformity of the billet in the furnace.