Large parts and dimensional accuracy of automobile stamping parts
More than a dozen large parts of automobile stamping parts are: the inner and outer panels of the hood, the top cover, the left and right fenders, the left and right side outer panels, the inner and outer panels of the trunk, the inner and outer panels of the front and rear doors, and the front, middle and rear floors.
There are many types of automotive stamping parts, and the steel plates used for different types of parts are also different.
Some sealing plates and brackets with low performance requirements and uncomplicated shapes will use steel plates with ordinary tensile properties;
Large-scale outer cover will use specially requested steel plate due to appearance request;
Some shapes are relatively complex, and parts with a deeper shape or relatively rapid changes require steel plates with good tensile properties;
The dimensional accuracy of metal stamping parts can generally be divided into two types: fine level and ordinary level. The fine level is the accuracy that can be achieved technically in the stamping process, while the ordinary level is the accuracy that can be achieved with a more economical means. When the mold manufacturing accuracy is high, the external dimension accuracy of the metal stamping parts can reach IT10 level, and the inner hole size can reach IT9 level.
The appearance quality of metal stamping parts should not be higher than the appearance quality of the original materials, otherwise the demand will increase the ability of subsequent processing to arrive, which will increase the cost of consumption.
The dimensional accuracy of metal stamping parts refers to the difference between the actual size of the stamping part and the fundamental size. The smaller the difference, the higher the dimensional accuracy of the metal stamping part. The main factors that cause dimensional errors of metal stamping parts are: the manufacturing accuracy of the convex and concave molds; the gap between the convex and concave molds; the elastic recovery of the data after stamping; the occasional factors in the production process, such as inaccurate positioning and unstable data performance.
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