Patent ID: 7302746
Filing Date: 2007-12-04
Classification: B23P,C21D,Y10T

Abstract:
1. An apparatus for coldworking holes in a workpiece comprising: a seamless sleeve comprised of a shape memory alloy having a superelasticity property, wherein the sleeve includes a tubular portion configured to be received by the hole, and a flange portion attached to the tubular portion, the flange portion including first interlocking portions; a cylindrical-shaped mandrel that is configured to be rotated while axially moved within the sleeve, the mandrel having a major diameter portion and a minor diameter portion, wherein the major diameter radially expands the sleeve while moved within the sleeve during the coldworking operation; and an end-cap configured to receive the sleeve and including second interlocking portions that receive the first interlocking portions to prevent rotational movement of the sleeve relative to the end cap.