The product quality must not be sloppy and must be produced and accepted in strict accordance with the corresponding standards. What are the acceptance standards for non-standard screws? The details are explained by Director Liu of the Quality Department of the Screw Factory.
First of all, non-standard screws are also the evolution of national standard screws. The specific testing items should also be determined according to the surface defect standards of national standard screws. For details, please refer to the corresponding national standards. If the surface coating and coating affect the identification of surface defects, it should be Pick up before examination.
Secondly, according to the requirements of the design drawings, the dimensions and materials of the non-standard screws should be inspected. This should pay attention to the inspection of the material. First, the raw material manufacturer should provide a material certificate report. Second, high-end products must require SGS material certification, and send them to relevant laboratories for material composition analysis to confirm whether the composition content meets the requirements of the drawing material.
The function requires non-destructive inspection again. When non-destructive inspection of non-standard screws is performed, if any quenching cracks on any part, wrinkles on the bearing surface and below are found, and whether the coating meets the environmental protection requirements of RoSH, etc.
Then there is the destructive test, such as non-standard screw hardness level to do the corresponding hardness impact test; internal hardness, mechanical properties, torsion test, etc., all of which will damage non-standard screws, but for screw factories with a strong quality concept, this is all Test items must be done.