1. Burrs: The remaining material is not completely left during the stamping or corner cutting process, and burrs are formed under the cutting surface of the steel plate. Based on the cutting surface, when the height of the burrs exceeds 0.2mm, iron is formed. the powder will damage the mold and cause bulging and indentation.
2. Bulges and dents. Abnormal bulges or depressions on the surface of the material are caused by foreign substances (iron filings, dust) entering the unwinding wire.
3. Roller mark: caused by a foreign substance attached to the cleaning or feed roller (occurs at a fixed pitch). Generally, the roller mark on the sheet can be removed.
4. Slip marks: These are caused by sliding rollers and occur during sudden stops or accelerations.
5. Roll material is crushed or edges are wrinkled: The unwinding line guide roller or the guide roller gap on the mold is small, which is caused by unbalanced feeding of the roll material.
6. Scratches: The main cause of scratches on parts is sharp scratches on the mold or metal dust entering the mold. Preventative measures include sanding the scratches on the mold and removing metal dust.
7. Bottom cracking: The main reason for cracking of the bottom part of the part is poor ductility of the material or pressing the mold plug too hard. Preventative measures include replacing the material with a more ductile one or loosening the plug.
8. Sidewall Wrinkles: The main cause of sidewall wrinkles on a part is that the material is not thick enough (thinner than the minimum allowable thickness) or the top and bottom molds are installed eccentrically, resulting in a large gap on one side and a small gap on the other. Preventive measures include immediate material replacement and mold readjustment.