| 摘要 |
A tool for reshaping or expanding metal tubular material includes an expandable mandrel having a plurality of duplicate spreader segments held in a cluster by an elastic O-ring about a wedge-shaped cam member, each of the segments including an external, curved wall having a curvature corresponding to a curvature of an external curved wall in every other segment such that when all segments are equally spaced a predetermined amount, they form a cylinder having gaps between adjacent spreader segments for contact against an internal surface of said tubular material for reshaping or expanding said tubular material. The wedge-shaped cam member includes a plurality of external faces corresponding to a number of internal spreader segment faces sloped to converge toward a front, mandrel-insertion end of the cam member and shaped complementary to the shape of the internal spreader segment faces for sliding engagement of the segments over an adjacent external face of the cam member.
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