Hi Paul,
It is not possible to define 2d axisymmetric bodies as rigid in Mechanical. You can specify a very high Young's Modulus or carry out the analysis in Workbench LS-Dyna, where it is possible to define 2d axisymmetric bodies as rigid.
For more information about Deep Drawing anlaysis, please refer to the following Ansys Help Document:
Deep Drawing (ansys.com)
Regards,
Vinayak Vipradas
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