Automated process for cold working holes

Metal deforming – With use of control means energized in response to activator... – Sensing tool or tool-linked part

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72342, 72370, B21D 4102

Patent

active

046401148

ABSTRACT:
A method for cold working holes employs an automatic riveting machine that is fed with memory metal sleeves having an O.D. slightly smaller than a hole to be worked. A mandrel is forced into the sleeve and plastically expands the sleeve in the hole thereby working the hole wall around the sleeve. The mandrel is withdrawn and the sleeve is thermally induced to return to its initial shape memory O.D. permitting removal of the shrunken sleeve from the work hole.

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