1997-02-24

Pulsating Blankholder Force 970987

In sheet metal stamping some industrial applications have shown that it is possible to achieve larger drawn depth by using a pulsating blankholder force.
In deep drawing, areas with and without tangential stresses have to be distinguished. Areas without tangential stresses can be described by the strip drawing test. Areas with tangential stresses are described by using a deep drawing die for the production of cups which are axisymmetric.
With the strip drawing test it could be shown that it is possible to reduce the increase of the friction force, caused by adhesion. Another effect is the reduction of the peak of the transition of static to dynamic friction.
It was shown by experimental research, that the wrinkle height of parts, produced with pulsating blankholder force is in the range of the wrinkle height of parts produced with a constant blankholder force which is equal to the maximum force of the pulsation. A reduction of the friction force was found, and the drawing depth was increased.

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