To provide an apparatus for cutting out a cutout section from the wall section of a component member formed as a hollow body, while a component member is manufactured based on an internal high tension forming method.
A punch 8 is provided with at least one elastic element at fixing state on the end section 13 in the side departed from a component member 7, and comes contact with the wall section corresponding to the cutout section 6 of the component member 7 at the other end section 11 and the elastic element based on its stiffness constitutes counter pressure against internal pressure as it increases inside the component member 7 and suddenly deforms elastically at the time of exceeding the maximum internal pressure. Accordingly the elastic element is so designed to enable the retreat movement of the punch 8.
PRIER MATTHIAS
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