DIE FOR PUNCHING SHEET METAL AND SHEET METAL PUNCHING APPARATUS HAVING THE DIE

摘要

A thin plate metal punching die (10) is provided with an end surface (60) which faces a thin plate metal to be punched; a through hole (62), which is opened on the end surface (60) and has a punch (13) inserted from an openin g (61) on the end surface (60); and an inner circumference surface (63) whic h defines the through hole (62). The end surface (60) and the inner circumfe rence surface (63) are connected at the opening (61) on the end surface (60) of the through hole (62) at an acute angle (.theta.).