Method for working holes

Details Method for working holes Method for working holes

1981-11-12

1984-02-28

Larson, Lowell A.

Metal deforming

With temperature modification of tool or of specified...

Cooling

72370, B21D 4102

Patent

active

044335679

ABSTRACT:
A method for working holes in metal which includes inserting into the hole a sleeve of metal having a shape memory O. D. slightly smaller than the hole to be worked, plastically expanding the sleeve in such hole with a mandrel and working the wall of such hole around the sleeve, allowing the sleeve to warm and shrink to its shape memory O. D. and removing the shrunken sleeve from the worked hole.

REFERENCES:
patent: 3388931 (1968-06-01), Johnson et al.
patent: 3900939 (1975-08-01), Greacen
patent: 3943748 (1976-03-01), King, Jr.
patent: 4035007 (1977-07-01), Harrison et al.

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