Translation:
1. Stamping Inspection Standards
1.1 Remove burrs that may cause harm, sharp corners, edges, and rough surfaces.
1.2 Unless otherwise specified, sharp corners on drawings are R1.5.
1.3 For stamped parts like door panels and visible surfaces, there should be no significant protrusions, indentations, roughness, scratches, rust, or other defects.
1.4 Burrs: Burr height after stamping L ≤ 5%t (t is the thickness of the plate).
1.5 Scratches, blade marks: Qualified if they do not cut when touched by hand, should be ≤ 0.1.
2. Bending Inspection Standards
2.1 Burrs: Burr height after bending extrusion L ≤ 10%t (t is the plate thickness). Unless otherwise specified, the internal bending radius is R1.
2.2 Embossing: Visible fold marks that are not felt by touch (can be compared with limit samples). 2.3 Bending direction, dimensions consistent with the drawing.
3. Sheet Metal Workpiece Inspection Standards
3.1 Riveted Parts
For pressed rivet nuts (columns), pressed rivet screws, expanding rivet nuts (columns), pull rivet nuts, etc., after pressing the components, the threads must not deform (nuts or screws can enter and exit freely, smoothly without jamming). Riveted parts should be flush with the surface, no protrusions or indentations allowed (should feel smooth to the touch), riveted parts should be perpendicular to the surface, no deformation or pig mouth phenomenon in the riveting area after riveting, uniform height and wall thickness of the riveted area, no burrs on the top.
4. Welding
4.1 Weld seams should be firm, uniform, without incomplete welds, cracks, lack of penetration, burn-through, undercut, etc. The length and height of the weld seam should not exceed 10% of the required length and height.
4.2 Welding point requirements: Weld point length 8-12mm, symmetrical position, consistent upper and lower positions. If there are special requirements for weld points on the processing drawing, follow the drawing.
4.3 Spot welding spacing less than 50mm, spot welding diameter less than φ5, evenly distributed, indentation depth on the spot not exceeding 15% of the actual thickness of the plate, and no obvious weld scars after welding.
4.4 After welding, non-welded areas should not have welding slag, arc damage, surface welding slag, spatter should be cleaned.
4.5 After welding, the external surface of the part should be free from slag inclusions, blowholes, weld beads, protrusions, indentations, etc., and internal surface defects should not be significant and should not affect assembly. Important parts like door panels should also relieve post-welding stress to prevent workpiece deformation.
4.6 The external surface of welded parts should be ground flat. For powder-coated or electroplated parts, the roughness after welding should be Ra3.2-6.3, for painted parts Ra6.3-12.5.
