How to define defects in sheet metal stamping parts?

Hardware stamping parts manufacturers may have some appearance defects after processing and producing metal stamping parts. Therefore, appearance inspection is an indispensable step. It is necessary to ensure that the hardware parts are qualified before they can leave the factory. So how do thin sheet metal stamping parts define defects? Acceptance in the visual inspection standard also requires acceptable defects to not affect the assembly and function. 1 Rainbow effect: galvanizing may cause discoloration or 'rainbow' effect. 2 Discoloration: The background color or the expected color has changed, or the color of the part surface is inconsistent. 3 Indentation: The groove marks on the surface of the part caused by sharp objects, which can be felt by the nails. 4 Rust/oxidation: The chemical reaction that occurs on the metal surface exposed to the air. 5 Traces: Refers to small pits, bend marks or other traces of the base material, which cannot be removed after painting. 6 Scratches: Shallow grooves on the surface of the part. 7 pits: crater-like defects on the surface of the part. 8 Dust or grease: dirt (not cleaned) generated during the manufacturing process and left on the surface of the part. 9 Plating marks/flow marks: due to the uneven thickness of the plating layer, the area on the surface of the part that is corrugated or striped. 10 Spots/sand/wool: any unexpected foreign matter on the painted surface or the surface of the part. 11 Mold indentation: due to the process marks caused by the forming die on the surface of the part, the position and size of the indentation marks of all parts are the same, and they are evenly distributed in the forming/bending area. The precision team has developed automated visual inspection equipment for quality inspection, which can perform 100% inspection on products to ensure that the quality of parts is 100% reliable, and achieve the goal of high inspection efficiency. Welcome to consult. [Related recommendation] Learn more: What are the methods for polishing the surface of stainless steel? Learn more: Manufacturing characteristics of automotive stamping parts molds Learn more: Points to note in the design of continuous stamping dies