Patent ID: 6128991
Filing Date: 2000-10-10
Classification: B21D,Y10T

Abstract:
A punch and die device for working a pipe material, said device comprising:external punch means located outside a pipe material, andinternal die means inserted in the pipe material for cooperation with a punch of said external punch means to work the pipe material;said internal die means being divided into two parts in a direction along a line which is orthogonal to that of reciprocating motion of the punch of said external punch means, one of said parts having working function and the other having no working function, said non-working part being forward and backward movable in the longitudinal direction of the pipe material,said internal die means being provided with mechanisms each for converting the forward and backward movement of said non-working part into a force pushing said working part of said internal die means toward a side lateral to a side to be worked of the pipe material and for exerting the force on said working part to thereby firmly hold said internal die means pressed against the pipe material.