Abstract: Based on the superfluous triangle material wrinkle model, the
no-wrinkle limit criterion of cylindrical cup multi-deep-drawing
is calculated as the prediction and control of the wrinkle
limit. According to fracture model, the no-fracture limit
criterion of cylindrical cup multi-deep-drawing is calculated as
the prediction and control of the fracture limit. Combining the
no-wrinkle limit criterion with the no-fracture limit criterion,
the no-wrinkle and no-fracture limit criterion and diagram on
cylindrical cup multi-deep-drawing are given as the prediction
and control of both wrinkle and fracture limits. In accordance
with this can determine the limit deep-drawing coefficient and
minimum deep-drawing coefficient, and can choose the
deep-drawing coefficient of multi-deep-drawing, blank-holder
force and deformation force by optimization choice method.
Theory calculation and test data are highly consistent, and
suitable for no-flange multi-deep-drawing and rigid punch
expanding.
Key words: Cylindrical
cup Multi-deep-drawing Wrinkle limit Fracture limit control
Optimization choice method
Manuscript received on
March 10, 1999; revised manuscript May 4, 1999
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