Uneven straight wall portion of deep drawn parts.

No ventilation holes were designed and manufactured on the convex mold, resulting in surface deformation and unevenness due to compressed air.

Ventilation holes must be added.

The rebound effect of materials can also cause unevenness on the surface of deep drawn workpieces.

An additional shaping process should be added.

Excessive clearance between the convex and concave molds makes it difficult to level the deep drawing.

The gap must be adjusted evenly.