Patent ID: 9610626
Date: 2017-04-04
CPC Classifications: B21D

Claim:
1. A pipe bend die unit comprising a bend die with a pipe-receiving groove of half-circular cross section formed on an outer peripheral surface of the bend die, the bend die being rotatable about a rotary axis, and the bend die comprising: a clamp member having a first groove part of half-circular cross section on an outer peripheral surface of the clamp member with a fitting recess formed on the first groove part and extending in a peripheral direction by a first predetermined length on a planar surface perpendicular to the rotary axis; and a counter pressure member having a second groove part of half-circular cross section formed on an outer peripheral surface of the counter pressure member, and a fitting protrusion extending in a peripheral direction by a second predetermined length from a tip end portion of the second groove part, the fitting protrusion being positioned in the fitting recess so that the first and second groove parts combine to form the pipe-receiving groove of half-circular cross section, the counter pressure member and the clamp member being hingedly connected to one another about the rotary axis, and supported so as to be rotatable relative to each other about the rotary axis, and the counter pressure member being supported to be rotatable about the rotary axis in a direction spaced from a position where a bending operation of the pipe is initiated, and held between the position where the bending operation of the pipe is initiated and a predetermined retracted position to be spaced from the position where the bending operation is initiated.