What are the common problems in stamping of automobile sheet metal parts?

2019-05-31 17:06:01

Automobile sheet metal is a comprehensive cold processing technology for sheet metal (usually less than 6mm), including shearing, punching/cutting/composite, folding, welding, riveting, splicing, forming (such as automobile body), etc. Its remarkable feature is that the thickness of the same part is the same. The products processed by sheet metal process are called sheet metal parts. Sheet metal parts in different industries are generally different, and they are often used as appellations when assembling.

Burr: In the process of punching or trimming, there is not enough surplus material. Burr occurs at the lower part of the steel plate section. When the height of the burr is above 0.2 mm, the iron powder will damage the die and cause convex and concave.

Convex and concave: Abnormal protrusion or depression of material surface is caused by foreign body (iron filings, dust) mixing in uncoiling line.

Roller Printing: Cleaning roller or feeding roller attachment caused by foreign bodies (with fixed pitch occurs), in general, can be removed from the plate on the roller printing foreign bodies.

Sliding prints: They occur when the roll slides and stops suddenly or accelerates.

Coil crushing may be edge wrinkling: the guide roll of the uncoiling line may be wrinkled by the small gap between the guide rolls on the die, due to the unbalanced feeding of the coil.

Scratch: The main reason for scratch on automobile parts is that sharp scratches on the die or metal dust falls into the die. The preventive measures are to grind the scratch on the die and remove metal dust.

Bottom cracking: The main reason for the bottom cracking of parts is poor plasticity of materials or too tight blank holder ring of dies. The preventive measures are replacing the better plasticity material or loosening the blank holder ring.

Side wall wrinkles: The main reason for wrinkles on the side wall of parts is that the thickness of materials is not enough (the allowable thickness is small) or eccentricity occurs when upper and lower dies are installed, resulting in large clearance on one side and small clearance on the other side. The preventive measures are to replace materials immediately and to readjust the dies.