Inspection of sheet metal bending parts and qualified standards:
First, the scope of application: the company's sheet metal pieces of the size, appearance inspection.
Second, the inspection items and acceptance criteria: A. Size acceptance criteria:
Size according to the requirements of the drawings and sheet metal processing tolerance table implementation, the special circumstances to the actual assembly and submitted to the R & D engineers to solve.
Schedule: sheet metal processing tolerance sheet sheet metal processing tolerance table:
A. Tolerance table for cutting finished products
Thickness division
Scale distinction 1.5mm below 1.6mm ~ 2.9mm 3mm above 120 or less
121 or more to 315 or less and more than or equal to ± 0.2 ± 0.3
± 0.4 ± 0.3 ± 0.4
± 0.5 ± 0.5 ± 0.7 ± 1.0
B. General tolerance of bending angle
Bend Type General Tolerance Right Angle Bend 0.5 ° Other Angle Bend 1.0 °
B. Surface treatment acceptance criteria:
A. Surface paint inspection standards:
1. Color and lines: by the system according to the requirements of the production model, the two sides confirmed. Acceptance according to the model, not a significant color (not greater than 3 degrees), lines meet the model.
2. Intrusion test: with 100 grid knife side 100 square grid to the substrate, with 3M tape paste, 60 degrees instantly forced to pull, not fall off 40/100 grid.
3. Solvent test: alcohol wipe, can not have discoloration, fade, dull and so on.
4. Hardness test: the pencil pencil tip to cut, pencil and test objects into the 45-degree launch, the surface without scratches. 5. Sheet metal surface paint before the need to be treated before the road, to achieve the purpose of double protection. According to the actual use of the results, allowing manufacturers to use double-sided galvanized material processing to replace the electric process.
