Metal deforming – By application of fluent medium – or energy field – Using fixed die
Patent
1981-10-23
1984-05-29
Gilden, Leon
Metal deforming
By application of fluent medium, or energy field
Using fixed die
291573C, 29421R, 291574, B21D 2200
Patent
active
044506120
ABSTRACT:
A swaging apparatus for expanding a tube radially to form a joint, the apparatus including a mandrel for insertion in the tube. A working fluid is supplied through the mandrel to apply hydraulic pressure to the tube. The mandrel carries a pair of oppositely directed ramps, and a pair of seal combinations that are movable axially along the ramps. The seal combinations define the ends of an annular volume within which the pressurized fluid flows between the mandrel and the tube, each seal combination including a softer primary seal, which may be an O-ring, and a harder backup seal. Positioning sleeves that are axially slidable on the mandrel prevent angular movement of the backup seals relative to the longitudinal axis of the mandrel, thereby maintaining a uniform circumferential extrusion gap between the mandrel and the tube when pressure is applied. When the mandrel is being inserted, the seals are disposed at the smaller ends of the ramps so as to minimize frictional resistance to the insertion, the outer primary seal being resiliently urged inwardly by the corresponding positioning sleeve. The seals are returned to the large ends of the ramps by the application of the hydraulic pressure.
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"Hydraulic Expansion System Lead-Free Tube-to-Tube Sheet Joints", Oct. '78, Energy Management.
Gilden Leon
Haskel, Inc.
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