Evaluation guidelines for 17 types of stamped part defects

Evaluation criteria for defects in stamped parts
1. Cracking
Inspection method: Visual evaluation criteria:
A-type defect: Cracking that can be noticed by untrained users. Stamped parts with such defects are unacceptable to users and must be frozen immediately upon discovery.
B-type defect: visible and determinable minor cracks. This type of defect is unacceptable for stamped parts in areas I and II, and welding and repair are allowed in other areas. However, the repaired parts are difficult for customers to detect and must meet the repair standards for stamped parts.
Class C defect: a defect that is ambiguous and determined after careful inspection. Stamped parts with this type of defect are repaired by welding within Zone II, Zone III, and Zone IV, but the repaired parts are difficult for customers to detect and must meet the repair standards for stamped parts.
2. Strain, coarse grain size, and dark damage
Inspection method: Visual evaluation criteria:
Class A defects: strains, coarse grains, and hidden injuries that can be noticed by untrained users. Stamped parts with such defects are unacceptable to users and must be frozen immediately upon discovery.
B-type defects: visible and determinable minor strains, coarse grains, and dark marks. Stamped parts with such defects are acceptable in Zone IV.
C-type defects: slight tensile damage, coarse grain size, and hidden damage. Stamped parts with such defects are acceptable in zones III and IV.
3. Deflated pond
Inspection method: visual inspection, oilstone polishing, touch, oiling Evaluation criteria:
A-type defect: It is a defect that users cannot accept, and untrained users can also notice it. After discovering this type of dent, the stamped parts must be immediately frozen. A-type dent stamped parts are not allowed to exist in any area.
B-type defect: It is an unpleasant defect that is a tangible and visible indentation on the outer surface of the stamped part. Such indentation is not allowed on the outer surface of Zone I and II of the stamped part.
Class C defect: It is a defect that needs to be corrected, and most of these dimples are in ambiguous situations that can only be seen after polishing with oilstones. Stamped parts of this type of sink are acceptable.
4. Waves
Inspection method: visual inspection, oilstone polishing, touch, oiling Evaluation criteria:
Class A defect: This type of wave can be noticed by untrained users in areas I and II of stamped parts, and cannot be received by users. Once discovered, the stamped parts must be immediately frozen.
B-type defect: This type of wave is an unpleasant defect that can be felt and seen in areas I and II of stamped parts and requires repair.
Class C defect: It is a defect that needs to be corrected, and most of these waves are in an ambiguous situation, which can only be seen after polishing with oilstones. Stamped parts with such waves are acceptable.
5. Uneven and insufficient flipping and cutting edges
Inspection method: Visual and touch evaluation criteria:
Class A defect: Any unevenness or shortage of flipped or cut edges on the inner and outer covering parts, which affects the quality of undercutting and welding overlap unevenness or shortage, and thus affects the welding quality, is unacceptable. Upon discovery, the stamped parts must be immediately frozen.
B-class deficiency