HOLE EXPANDABILITY EVALUATION DEVICE AND HOLE EXPANDABILITY EVALUATION METHOD

摘要

The present invention relates to an apparatus for evaluating hole expandability and a method for evaluating hole expandability, comprising: a lower mold portion having a plurality of lower subdivision molds disposed to support a specimen from below and move in a horizontal direction, and an upper portion of the lower mold portion. An upper mold portion having a plurality of upper split molds disposed to pressurize the specimen from the upper side and move in a horizontal direction, a shear tip portion that is movable to penetrate the specimen, and a shear tip portion for hole shearing the specimen, and a shear tip portion It is connected to and characterized in that it comprises a punch portion having an extension tip portion for extending the hole of the specimen.