Large size and dimensional accuracy of automotive stamping parts
- Large pieces and dimensional accuracy of automotive stamping parts
Automobile stamping parts are divided into many types, and the steel plates used for different types of parts are also different.
For some sealing plates, brackets and the like that do not require very high performance and the shape is not complicated, it is easy to use steel plates with general tensile properties for a long time.
Due to strict appearance requirements, large outer covering parts inevitably use specially required steel plates.
Some shapes are more complex, and some are deep shapes or steel plates with relatively sharp changes that do not require good tensile properties.
The dimensional accuracy of metal stamping parts can be generally divided into two categories: precision grade and ordinary grade. The precision grade is the precision that can be achieved by the stamping process, and the ordinary grade is the precision that can be achieved by economical means. When the machining accuracy of the mold is high, the shape and dimensional accuracy of the metal stamping parts can reach the ITl0 level, and the inner hole size can reach the IT9 level.
The surface quality of metal stamping parts should not be higher than the surface quality of raw materials, otherwise it needs to increase the follow-up processing to achieve, but also increase the cost of production.
The dimensional accuracy of metal stamping parts refers to the difference between the actual size and the basic size of the stamping parts. The smaller the difference, the higher the dimensional accuracy of the metal stamping parts. The main factors that lead to the size error of metal stamping parts are: the manufacturing accuracy of convex and concave molds, the gap between convex and concave molds, the elastic recovery of materials after stamping, inaccurate positioning, and unstable material properties.