Patent ID: 7765850
Filing Date: 2010-08-03
Classification: B21D

Abstract:
1. A mechanical pipe-end expander comprising: a cone, and a hollow die having a first end and a second end, the first end adapted to be inserted in a pipe end portion of a steel pipe for pipe expansion, wherein the hollow die is circumferentially dividable into a plurality of tapered wedge bodies and a taper angle of an inner surface of the hollow die is the same as a taper angle of an outer surface of the cone, wherein an inner radius of the hollow die is larger in a direction from the second end to the first end of hollow die, and an outer radius of a part of the hollow die adapted to be inserted into the pipe-end portion to be expanded is larger in a direction from the second end to the first end of the hollow die, and wherein the cone is adapted to be inserted into the pipe-end portion to be expanded, the tapered wedge bodies of the hollow die adapted to surround the cone once inserted into the pipe end portion; and the cone is adapted to be axially drawn out of the pipe-end portion leaving the hollow die within the pipe-end portion and causing enlargement of a radius of the hollow die.