Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1995-05-22
1997-02-04
Hughes, S. Thomas
Metal working
Method of mechanical manufacture
Assembling or joining
29523, 29557, 2989015, B23P 1700
Patent
active
055986234
ABSTRACT:
A unitary assembly of tubing and an end fitting. The end fitting includes a threaded fastener fitting having a tubular bore extending therethrough. A conical transition is coaxially provided to the bore at the thread/hex interface where the bore constricts. The end of the tubing is coaxially impacted, expanded and sized to an external configuration and dimension that achieves an interference fit relative to the tubular bore through the end fitting. The non-expanded end of the tubing is inserted into the larger of the two bores in the end fitting passed the conical transition and through the smaller bore until it experiences interference from the expansion. The interference is overcome by pressing the expansion into the bore in the end fitting until the expansion is completely seated into the end fitting. The expanded tube and end fitting is machined coaxially using a five step tool. The tool machines the inside diameter of the tube where it had been reduced during end forming, swages the expanded tube into the end fitting bore below the hex, machines the female pilot land, machines the O-ring gland, and machines the thread lead on the end fitting.
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Gottorff Richard L.
Panek John G.
Hughes S. Thomas
ITT Corporation
Lewis J. Gordon
Twomey Thomas N.
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