What are the reasons for the difficulty in manufacturing automobile stamping parts?

2022-07-19 17:04:11

A large number of cold stamping processes are used in the production of automotive stamping parts, which is suitable for the needs of multi variety and mass production of automotive stamping parts industry. In the medium and heavy-duty vehicles, most of the covering parts, such as the body outer plate, and some load-bearing and supporting parts, such as the frame, carriage and other auto parts are automotive stamping parts. The steel used for cold stamping is mainly steel plate and steel strip, accounting for 72.6% of the steel consumption of the whole vehicle. Cold stamping materials are closely related to the production of automotive stamping parts. The quality of materials not only determines the performance of products, but also directly affects the process design of automotive stamping parts, and affects the quality, cost, service life and production organization of products. Therefore, reasonable selection of materials is an important and complex work

The manufacturing of automobile stamping parts is difficult. The main factors are as follows:

1. Surface quality of automotive stamping products

Any defect on the surface of automobile body stamping parts will affect the beauty of products, so the surface of automobile stamping parts is not allowed to have defects. Automotive stamping parts require clear, smooth decorative edges, uniform transition and symmetrical left and right, and the edges and lines between automotive body external stamping parts must be connected smoothly. Stamping parts must not only meet the requirements of structure and function, but also meet the requirements of surface quality.

2. Overall dimensions and shapes of automotive stamping parts

The shape of automotive body stamping parts is mostly three-dimensional shape. It is difficult to accurately make its size and shape in automotive body stamping parts. Therefore, the overall dimensions of automotive body stamping parts are generally determined with the help of the main model. The position, shape and size of various holes and the shape of three-dimensional curved surface must be consistent with the main model. Moreover, the dimensions of stamping parts of automobile body that cannot be marked must be measured through the main model. Because the shape is very complex, it is difficult to control the springback of materials, which increases the difficulty of controlling the dimensional accuracy of products.

3. Strength and rigidity of automobile stamping parts

During the deep drawing of automobile body stamping parts, the rigidity of some parts is usually poor, resulting in local sinking of products. Moreover, the automobile body stampings with poor strength and rigidity will produce a hollow sound when they are vibrated. If the automobile body stampings are assembled into a car, and the automobile will vibrate at high speed, the service life of the automobile body stampings will be seriously reduced.

4. Processability of automobile stamping parts

The structural shape and size of automotive body stamping parts determine that the process is complex. It is impossible to process them directly in one process, and at least three processes are required. However, the spatial surface shape of automotive body stamping parts as well as the bosses, ribs and edges on the surface should be formed by one-time drawing as far as possible, otherwise it is difficult to ensure the smoothness of the surface and the consistency of the geometric shape of automotive body stamping parts.

Automotive stamping technology is developing towards the production direction of precision, multi-function, energy efficiency, safety and cleaning. The manufacturing process level and quality of stamping workpiece have a direct impact on the quality and cost of automotive manufacturing to a large extent.