Method of cold working holes using a shape memory alloy tool

Metal deforming – With temperature modification of tool or of specified... – Of tool

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29447, 72364, B23P 1102

Patent

active

052654567

ABSTRACT:
Fatigue lifetime enhancement of the holes formed in structural members occurs by introducing a cold working tool or interference fit fasteners fabricated from shape memory alloy materials. The tool may be employed to expand the wall of a hole while the tool material is raised above the critical transitional temperature. Then, upon lowering the tool material below the critical transitional material, it contracts permitting it to be withdrawn. Bushings and interference fit fasteners may be installed in holes formed in structural members when a shape alloy material bushing or fastener is heated above the critical transitional temperature so that an interference fit results and the hole is cold worked. If the alloy material is not cooled below the critical transitional temperature, the interference fit may be permanently maintained, thereby further enhancing the fatigue life of the members.

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Champoux, et al., "Fatigue Life Enhancement and High Interference Bushing Installation Using the ForceMate Bushing Installation Technique," Special Technical Publication 927, 1987, Copyright American Society for Testing and Materials 1916 Race St., Philadelphia, Pa. 19103.

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