Defects

Reasons

Measures

Surface scratches on deep drawn parts.

Sharp pressure marks on the surface of the convex or concave molds, resulting in corresponding tensile marks on the surface of the workpiece.

Simply grind or polish the damaged surface.

The gap between the convex and concave molds is too small or uneven, causing scratches on the surface of the workpiece during deep drawing.

Trim the gap between the convex and concave molds until it is suitable.

The surface of the concave die fillet is rough, and the surface of the workpiece is scratched during deep drawing.

Grind and polish the radius of the concave mold corner.

During stamping, impurities are mixed in due to the unclean working surface or material surface of the die, resulting in damage to the surface of the workpiece.

Always keep the surface of the convex and concave molds clean during deep drawing, and wipe the blank before drawing.

When the hardness of the convex and concave molds is low, the surface of the molds is covered with metal debris, which also causes pulling marks on the surface of the deep drawn workpiece.

In addition to increasing the hardness of the surface of the convex and concave molds, it is also necessary to regularly inspect the surface of the convex and concave molds during deep drawing, even if any remaining metal debris is removed.

Poor lubricant quality can also increase the surface roughness of deep drawn workpieces.

Use lubricants suitable for deep drawing processes, and if necessary, filter the lubricant before use. To prevent impurities from entering and damaging the surface of the workpiece.