When we see the metal stamping parts, firstly we see its appearance, for different metal stamping parts appearance requirements will be different, but there may be a lot of people do not know, what kind of appearance is unqualified, defective?
Appearance defect type of metal stamping parts:
Crack: metal material appears fracture in stamping process
Scratch: strip - like shallow groove on the surface of hardware
Abrasion: damage caused by contact and friction between material surfaces
Oxidation: chemical change between material and oxygen in air
Deformation: appearance variation of materials during stamping or transfer
Burr: the process of punching or chamfering does not completely leave excess material
Bump: an abnormal bump or dent in the surface of a material
Die mark: mark left by the die on the material surface during stamping
Blot: in processing process oily be soiled or dirt is attached its surface cause
Based on the above introduction, we can know that metal stamping parts are unqualified if they have cracks, scratches, deformations, etc., and the appearance of the metal stamping parts with the above.