Pipe bend die unit

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 to receive a pipe to be bent during a bending operation that produces a bent portion in the pipe, the bend die being rotatable about a rotary axis, and the bend die comprising:

• a clamp member that includes 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;
• the clamp member also possessing a circularly recessed portion that is continuous with the first groove part that faces the bent portion of the pipe during the bending operation and around which the pipe is bent during the bending operation, the circularly recessed portion being integral with the clamp member to rotate together with the clamp member about the rotary axis;
• 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 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 so as to be rotatable relative to each other about the rotary axis;
• the counter pressure member comprising:
• at least one member and an other member, the one member and the other member being detachably connected to each other in a manner allowing the other member to be disconnected from the one member so that the other member, upon becoming worn as a result of bending pipes, is replaceable by a new other member that is connectable to the one member,
• the one member including a rotary support portion supported rotatably about the rotary axis;
• the other member including at least a portion of the second groove part,
• wherein the one member is a first member and the other member is a third member, and the counter pressure member also includes a second member that is detachably connected to the first and third members so that the first, second and third members are separable from each other;
• and
• wherein the second member includes a groove, a portion of the third member being positioned in the groove so that one side of the third member faces the groove in the second member, a side of the third member facing away from the groove being a curved side.

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 to receive a pipe to be bent during a bending operation that produces a bent portion in the pipe, the bend die being rotatable about a rotary axis, and the bend die comprising:

• a clamp member that includes 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;
• the clamp member also possessing a circularly recessed portion that is continuous with the first groove part that faces the bent portion of the pipe during the bending operation and around which the pipe is bent during the bending operation, the circularly recessed portion being integral with the clamp member to rotate together with the clamp member about the rotary axis;
• 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 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 so as to be rotatable relative to each other about the rotary axis;
• the counter pressure member comprising:
• at least one member and an other member, the one member and the other member being detachably connected to each other in a manner allowing the other member to be disconnected from the one member so that the other member, upon becoming worn as a result of bending pipes, is replaceable by a new other member that is connectable to the one member,
• the one member including a rotary support portion supported rotatably about the rotary axis;
• the other member including at least a portion of the second groove part;
• wherein the one member is a first member and the other member is a third member, and the counter pressure member also includes a second member that is detachably connected to the first and third members so that the first, second and third members are separable from each other;
• wherein the first member includes a groove, a portion of the second member being positioned in the groove;
• and
• wherein the second member includes a groove, a portion of the third member being positioned in the groove.