Wrinkling
A draw defect where compressive flange stresses buckle the metal into folds.
What it means on the floor
Wrinkling appears when the flange or wall of a drawn part experiences compressive hoop stress greater than the material can resist without buckling. It shows up in the flange, the wall, or the corners.
Common fixes include increasing blank-holder pressure, adding draw beads, adjusting blank size, or improving lubrication.
Category: Defects
Applying the term
Interpret Wrinkling in the context of the drawing, governing standard, and customer requirement in front of you — the same word can carry different limits in design, quality, and production documents. Check whether a stated value is nominal, minimum, maximum, or reference-only, and whether it applies before forming, after forming, or after heat treatment.