The main factors that make automobile stamping parts difficult to manufacture
In automobile manufacturing, 60%-70% of metal parts need to be formed by plastic processing. Stamping is an important method. It is one of the most basic, traditional and important metal processing techniques. In medium- and heavy-duty vehicles, most of the covering parts such as the outer panel of the body, and some load-bearing and supporting parts such as the frame, the carriage and other auto parts are processed by automobile stamping parts. Its characteristics are light weight, good rigidity, and after the sheet metal is plastically deformed, the internal structure of the metal is improved, which increases the strength of the stamping parts.
It is difficult to process and mold manufacture automobile stamping parts, and the main factors are as follows:
1. Surface quality of processed products of automobile stamping parts
Any defects on the surface of stamping parts of automobile body will affect the appearance of the product, so the surface of stamping parts of automobile is not allowed to have defects. The processing of automobile stamping parts requires that the decorative ridges are clear, smooth, uniform in transition and symmetrical, and the ridges between the outer stamping parts of the automobile body must be smooth. Stamping parts not only need to meet the structural and functional requirements, but also must meet the requirements of surface quality.
2, the overall size and shape of automobile cnc machining
The shape of automobile body stamping parts is mostly three-dimensional. It is difficult to accurately make the size and shape of the automobile body stamping parts. Therefore, the main model is generally used to determine the outline dimensions of the automobile body stamping parts. The position, shape and size of the various holes, and the three-dimensional surface shape must be consistent with the main model, and the dimensions that cannot be marked on the auto body stamping parts must be measured by the main model. Because the shape is very complex, it makes it difficult to control the rebound of the material. , Which increases the difficulty of controlling the accuracy of product dimensions.
3, processing strength rigidity of automobile stamping parts
When the automobile body stamping parts are deep-drawn, they usually make certain parts have poor rigidity, causing the product to sink locally. Moreover, automobile body stamping parts with unsatisfactory strength and rigidity will produce a kind of hollow sound when they are subjected to vibration. If such automobile body stamping parts are used to assemble a car, and the car will vibrate when driving at high speed, it will seriously reduce the car body. The life of stamping parts.
4. Processing technology of automobile stamping parts
The structural shape and size of automobile body stamping parts determine that the process has a certain degree of complexity, and it is impossible to directly process them in one process. At least three processing processes are required. However, the spatial surface shape of the stamping parts of the automobile body and the bosses, ribs and ridges on the curved surface should be formed by one-time deep drawing as much as possible, otherwise it is difficult to ensure the smooth surface and the consistency of the geometric shape of the stamping parts of the automobile body.
Automotive stamping parts processing technology is developing in the direction of precision, multi-function, high efficiency, energy saving, safe and clean production. The manufacturing process and quality of stamping parts have a direct impact on the quality and cost of automotive manufacturing to a large extent.