If wrinkles occur during the production of a component, this is a clear sign that the wrong production method was chosen or that important process parameters were not determined correctly. Often, visualizing the forming process step by step in the simulation is sufficient to detect the problem areas and to take the correct countermeasures.

Wrinkles always occur when there is a local excess of material. Strong compressible stresses then compress the material and it literally deflects into the wrinkles, if this is made possible by the process design.

Accordingly, there are numerous factors that favour the wrinkling:

• Gap between sheet metal, blank holder and punch: The material has room to escape.

• Low blank holder pressure: The wrinkling is not counter