Inspection features of automotive precision stamping parts 'hardware'

Compared with metal processing parts, the detection of automotive precision stamping parts has the following characteristics: 1. The shape of the workpiece is often complicated and irregular, and it is difficult to locate, support, and clamp; 2. The rigidity of the workpiece is generally poor, and the inspection process is easy Deviation caused by deformation; 3. Except for a small number of small stamping parts, the size reference of automotive precision stamping parts is usually placed in the body coordinate system for disposal, except for many feature parts of the workpiece (such as holes, flanges, etc.) The distance size of the coordinate line is marked on the drawing, and the size value is not given for most appearance contours (especially free-form surfaces). The mode of dimensioning with coordinate grids, which is still commonly used in the 1980s, has gradually been replaced by CAD data. The CAD data of stamping parts, welded parts and car bodies supplied by the design department can be used as the basis for the dimensions of manufacturing molds, welding fixtures and inspection tools.