Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1983-10-13
1986-02-04
Goldberg, Howard N.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291574, 29237, 29421R, 29523, 29727, 72 58, 72 62, B23P 1526, B23P 1102, B21D 3920
Patent
active
045676313
ABSTRACT:
A method for radially expanding tubes within a tube sheet involves the application of radially expansive swaging forces from a pre-expander apparatus and a hydraulic mandrel. The pre-expander is used first and includes at least one primary expander and at least one secondary expander. The expanders surround and are compressed axially by a draw bar, thereby producing outwardly directed radial pressure against the interior surface of the tube anchoring the tube within the tube sheet. An unexpanded land remains between the two expanded regions corresponding to an axially incompressible spacer that separates the expanders. Next, the hydraulic mandrel, which has seals that define the ends of a pressure zone, is inserted in the tube and positioned so that both seals engage unexpanded portions of the tube, one of these unexpanded portions being the land. Upon the application of hydraulic pressure, the axial forces acting on the mandrel are balanced, and the tube is expanded to form a joint having the desired leak-proof qualities.
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Goldberg Howard N.
Haskel, Inc.
Wallace Ronald S.
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