Evaluation criteria for 17 kinds of stamping parts defects


Release time:

2022-01-10

Class A defects: cracking that can be noticed by users without training. The stamping parts with such defects are not acceptable to users, and the stamping parts should be frozen immediately after discovery.

Evaluation criteria for 17 kinds of stamping parts defects

Criteria for defect evaluation of stamping parts

1, craze

Inspection method: Visual evaluation criteria:

Class A defects: cracking that can be noticed by users without training. The stamping parts with such defects are not acceptable to users, and the stamping parts should be frozen immediately after discovery.

Class B defects: visible and identifiable subtle cracks, such defects are not acceptable in the ⅰ and ⅱ areas, other areas are allowed to repair welding, but repair parts are not easy to be detected by customers and must meet the repair standards of stamping parts.

Class C defect: in the ambiguous, after careful inspection to determine the defect, such defect stamping parts in the ⅱ area, ⅲ, ⅳ area for repair repair processing, but the repair part is not easy to be detected by customers and must meet the repair standard of stamping parts.

2, strain, coarse grain, dark injury

Inspection method: Visual evaluation criteria:

Class A defects: strain, coarse grain and dark injury that can be noticed by users without training. The stamping parts with such defects are not acceptable to users, and the stamping parts shall be frozen immediately after discovery.

Class B defects: visible and identifiable subtle strains, coarse grains, dark wounds, such defects are acceptable for stamping parts in zone ⅳ.

Class C defects: slight strain, coarse grain, dark damage, such defects are acceptable for stamping parts in zones ⅲ and ⅳ.

3, flat pond

Inspection method: visual, whetstone grinding, touch, oil evaluation criteria:

Class A defect: it is the defect that cannot be received by the user, and can be noticed by the user without training. The stamping parts shall be frozen immediately after the discovery of this type of deflated pond. The stamping parts of Class A deflated pond are not allowed to exist in any area.

Class B defect: A kind of unpleasant defect, it is a palpable and visible identifiable concave pond on the outer surface of the stamping part. Such concave pond is not allowed to exist on the outer surface of the stamping part ⅰ and ⅱ.

Class C defects: These are defects that need to be corrected. Most of these ponds are in ambiguous conditions and can only be seen after the whetstone is polished. Stamping parts of such deflated ponds are acceptable.

4, waves

Inspection method: visual, whetstone grinding, touch, oil evaluation criteria:

Class A defect: This kind of wave can also be noticed by users who have not been trained in areas ⅰ and ⅱ of stamping parts, but users can not receive it. After finding it, stamping parts should be frozen immediately.

Class B defect: THIS TYPE OF wave IS an UNPLEASANT defect, a perceptible and VISIBLE IDENTIFIABLE wave in areas ⅰ and ⅱ of the stamping, which needs to be repaired.

Class C defects: defects that need to be corrected. Most of these waves are in ambiguous conditions and can only be seen after whetstone grinding. Stamping parts of such waves are acceptable.

5, flanging, cutting edge uneven and shortage

Inspection method: visual, touch evaluation criteria:

Class A defects: for any flanging, edge cutting and shortage of inner and outer covering parts, affecting the quality of biting edge and welding edge uneven and shortage, so as to affect the quality of welding is unacceptable after the discovery of stamping parts shall be frozen immediately.

Class B defects: visible, identifiable flanging, edge cutting unevenness and shortage that have no effect on nipping, welding lap and welding quality. The stamping parts with such defects are acceptable in zone ⅱ internal ⅲ and ⅳ.

Class C defects: Slight flanging, unleveling and shortage of cutting edges have no effect on the welding quality of nipping and lap edges, and stamping parts for such defects are acceptable.

6, burr :(edge cutting, punching)

Inspection method: Visual evaluation criteria:

Class A defects: punching that seriously affects the fitting degree of welding edges and the positioning and assembly of stamping parts, and large burrs that are easy to cause personal injury. Stamping parts with such defects are not allowed to exist and must be repaired.

Class B defects: moderate burrs that have a slight effect on the degree of weld lap fit and the punching of the stamping part positioning assembly. Stamping parts with this defect are not allowed to exist in zones ⅰ and ⅱ.

Class C defects: small burrs, where stamping parts are allowed to exist without affecting the quality of the vehicle.

7. Hair pulling and scratches

Inspection method: Visual evaluation criteria:

Class A defects: seriously affect the surface quality, potentially lead to tension and scratches of the stamping parts, such defects are not allowed to exist.

Class B defects: Visible and identifiable flaps and scratches. Stamping parts for such defects are allowed in zone ⅳ.

Class C defects: Slight possibility of drawing and scratching of the stamping parts, such defects are allowed to exist in zones ⅲ and ⅳ.

8, the springback

Test method: Put it on the tester test evaluation criteria:

Class A defects: severe spring back resulting in size matching and welding deformation between the stampings. Such defects are not allowed in the stampings.

Class B defects: large size out of tolerance, springback which affects the size matching and welding deformation between the stamping parts, such defects are allowed to exist in the section ⅲ and ⅳ.

Class C defect: the small size out of tolerance, which has a slight impact on the size matching and welding deformation between the stamping parts, the stamping parts are allowed to have ⅰ, ⅱ, ⅲ, ⅳ zone.

9. Leaky punching

Inspection Method: visual inspection and counting mark with water-soluble marker

Evaluation CRITERIA: Any hole leakage on the punch will affect the positioning and assembly of the punch and is not acceptable.

10 and wrinkling

Inspection method: Visual evaluation criteria:

Class A defects: severe creases resulting in material overlap. Stamping parts with this defect are not allowed.

Class B defects: visible and palpable wrinkling. These defects are acceptable in zone ⅳ.

Class C defects: slight, less noticeable wrinkling, such defects are acceptable in zones ⅱ, ⅲ, ⅳ.

11, pitting group, pitting, indentation

Inspection method: visual, whetstone grinding, touch, oil evaluation criteria:

Class A defects: pitting concentrated, more than 2/3 of the whole area are distributed with pitting, such defects in ⅰ, ⅱ area, should be immediately frozen stamping parts.

Class B defects: pitting can be seen and felt. Such defects are not allowed to occur in zones ⅰ and ⅱ.

Class C defects: single pitting spots can be seen after polishing, and the distance between pitting spots in area ⅰ is required to be 300mm or greater. Stamping parts with such defects are acceptable.

12, grinding defects, grinding printing

Inspection method: visual, whetstone grinding evaluation criteria:

Class A defects: polished through, visible on the outer surface, immediately visible to all customers. The stamping parts shall be frozen immediately after such stamping is found

Class B defects: These defects can be seen and felt, and can be proved after polishing in disputed areas. Such defects are acceptable in zones ⅲ and ⅳ. Class C defects: After grinding with whetstone, it can be seen that the stamping parts of such defects are acceptable.

13. Material defects

Inspection method: Visual evaluation criteria:

Class A defects: material strength does not meet the requirements, traces left by rolled steel plate, overlap, orange peel, stripe, loose galvanized surface, galvanized layer peeling. The stamping parts shall be frozen immediately after such stamping is found.

Class B defects: material defects left by rolled steel sheet, marked marks, overlaps, orange peels, stripes, loose galvanized surface, peeling galvanized layer, such defects are acceptable in zone ⅳ.

Class C defects: material defects left by rolled steel sheet with ambiguous marks, overlapping, orange peel, striations, loose galvanized surface, peeling galvanized layer. Such defects are acceptable in zones ⅲ and ⅳ.

14. Oil pattern

Inspection method: visual, whetstone grinding

Evaluation criteria: No obvious impression can be obtained in zone ⅰ and ⅱ after whetstone grinding.

15. Bumps and depressions

Inspection method: visual, touch, whetstone grinding evaluation criteria:

Class A defect: it is the defect that cannot be received by the user, and can be noticed by the user without training. The stamping parts shall be frozen immediately after the discovery of class A bumps and depressions.

Class B defect: an unpleasant defect, which is a perceptible and visible identifiable bump or depression on the outer surface of the stamping part. Such defects are acceptable in zone ⅳ.

Class C defects: defects that need to be corrected. Most of these bumps and depressions are in ambiguous situations, which can only be seen after whetstone grinding. Such defects are acceptable in zones ⅱ, ⅲ and ⅳ.

16, rust,

Inspection method: visual inspection

Evaluation criteria: Stamping parts are not allowed to have any degree of corrosion.

17. Stamping

Inspection method: Visual evaluation criteria:

Type A defect: THE stamping which cannot be received by the user and can be noticed by the user without training. The stamping parts shall be frozen immediately after such stamping is found.

Class B defect: an unpleasant, identifiable stamp on the outer surface of the stamping. Such defects are not allowed in zones ⅰ and ⅱ, but can be accepted in zones ⅲ and ⅳ without affecting the quality of the vehicle.

Class C defects: stamping prints that need to be confirmed by whetstone grinding. Stamping parts with such defects are acceptable without affecting the quality of the vehicle.

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