Punch and die device for working pipe

Abstract

A punch and die device for working such as punching of a pipe material is disclosed, of which internal die means can easily be inserted into a pipe material even if an open end of the pipe material to be worked has burrs inward extending therefrom, and in which it is easily detected whether the internal die means is pushed toward a lateral side or lateral sides of the pipe material and thereby firmly held. The punch and die device for working a pipe material comprises: external punch means located outside a pipe material P, and internal die means K inserted in the pipe material for cooperation with a punch 30 of the external punch means to work the pipe material P; the internal die means K being divided into two parts in a direction orthogonal to that of reciprocating motion of the punch 30 of the external punch means, one 1 of the parts having working function and the other 2 having no working function, the non-working part 2 being forward and backward movable in the opening direction, i. e., longitudinal direction of the pipe material P; the internal die means being provided with mechanisms each for converting the forward or backward movement of the non-working part 2 into a force pushing the working part 1 of the internal die means K toward a side p2 lateral to a side p1 to be worked of the pipe material P and for exerting the force on the working part 1 to thereby firmly hold the internal die means K pressed against the pipe material. A punch and die device for working such as punching of a pipe material is also disclosed, which is capable of working any pipe material at a position on the center line of the pipe material with respect to the width direction even if there are variations in pipe width.