Inspection standard and description of appearance defects of precision stamping parts

1 Inspection method for irregular rounded corners: visual inspection and inspection tool measurement of rounded corner radius is not even enough, not clear and smooth enough. Outer cover parts are not allowed. The irregular rounded corners of some assembly surfaces and lap surfaces of the inner cover parts not only affect the appearance of precision stamping parts, but also affect welding and assembly seriously. 2 Inspection method of pit bag: visual inspection. The existence of pits seriously affects the appearance quality of the covering parts after painting, which is a defect that customers cannot tolerate. Large-area pits will also affect the strength and fatigue of precision stamping parts and cannot be repaired. 3 Material defect inspection method: visual standard: material strength does not meet the requirements, traces left by the rolled steel plate, overlap, orange peel, streaks, loose galvanized surface, and peeling of galvanized layer. 4 Deformation (protrusions, depressions, waves) inspection methods: visual inspection, sanding with oilstone, touching, and oiling. Type A defects: defects that users cannot accept, and users without training can also notice it. After discovering Type A collapsed ponds, they must Freeze precision stamping parts immediately. Type B defect: It is an unpleasant defect. It is a type C defect that is tangible, visible and determinable on the outer surface of precision stamping parts: it is a defect that needs to be corrected, most of which are ambiguous In this case, it can only be seen after the whetstone is polished. 5 Inspection methods for napping, indentation and scratches: visually, the outer surface of the outer cover is not allowed to have napping, scratches, or indentations; the inner surface of the outer cover is not allowed to have scratches or indentations that affect the quality of the outer surface. The surface of the inner cover is not allowed to have serious scratches and indentations that may cause the parts to crack. 6 Wrinkle inspection method: visually, the outer cover is not allowed to have any wrinkles that are easily noticeable by the customer, and the inner cover is not allowed to have serious wrinkles that cause material overlap. 7 Burr inspection method: visually, the length of the burr is required to be less than 10% of the thickness of the sheet. Any burr that affects the degree of adhesion of the welded edges is unacceptable. Any burr that can easily cause personal injury is unacceptable. Any punching burrs that affect part positioning and assembly are unacceptable. 8 Stacking inspection method: visually, the outer covering parts are not allowed to have overlapping defects. The different degrees of overlapping defects of the inner covering parts will cause customer complaints. The functional precision stamping parts also affect the assembly of the parts and the strength of the body. 9 Corrosion inspection method: visual inspection and dissection. Corrosion is the long-term storage or improper storage of precision stamping parts that causes rust, which has a vital impact on the function, strength and fatigue resistance of stamping parts. 10 Inspection methods for polishing defects and polishing marks: visual inspection, oilstone polishing Type A defects: polished through, clearly visible on the outer surface, and immediately visible to all customers. Type B defects: can be seen and touched, and can be proved after polishing in disputed areas. Class C defect: It can be seen after polishing with oilstone. 11 Inspection method for cracks: visually. Any chipping of the outer cover is unacceptable. For the inner cover parts, only slight cracks are allowed to be repaired by welding, but the repaired parts are not easy for customers to find and must meet the repair standards of precision stamping parts. 12 Necking inspection method: visual inspection and dissection. Necking is a potential dangerous fracture point in the forming process of precision stamping parts, which has a vital influence on the function, strength and fatigue resistance of precision stamping parts. According to the degree of necking, it is judged whether the precision stamping parts are qualified, repaired, scrapped, etc. The necking of the outer cover affects the appearance of the whole vehicle, which is unacceptable for customers. 13 Pockmark inspection method: visual inspection, whetstone polishing, touch, oiling. Type A defects: Pockmarks are concentrated, and pits are distributed over 2/3 of the entire area. Type B defects: pitting can be seen and touched. Type C defects: Separate pits can be seen after polishing, and the distance between pits is required to be 300mm or more in zone 1.