Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1981-07-02
1984-01-17
Goldberg, Howard N.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
29727, 72 98, 72370, 72 78, B23P 1526
Patent
active
044256965
ABSTRACT:
A method of making a new high performance heat transfer tube for use in an evaporator of a refrigeration system is disclosed. According to this novel method, a grooved mandrel is placed inside an unformed tube and a tool arbor having a tool gang thereon is rolled over the external surface of the tube. The unformed tube is pressed against the mandrel to form at least one internal rib on the interior of the tube. Simultaneously, at least one external fin convolution is formed on the exterior of the tube. The external fin convolution has depressed sections above the internal rib where the tube is forced into the grooves of the mandrel to form the rib. A smooth roller-like disc on the tool arbor is rolled over the external surface of the tube after the initial formation of the external fin and internal rib. The resulting heat transfer tube has an exterior with a subsurface channel consisting of interconnected cavities and subsurface passages. The interior of the tube has a helically extending rib located beneath the openings of the external cavities.
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Article by S. G. Bankoff "Entrapment of Gas in the Spreading of Liquid over a Rough Surface".
Article by Peter Griffith and John D. Wallis "The Role of Surface Conditions in Nucleate Boiling".
Adour David L.
Carrier Corporation
Goldberg Howard N.
Rising V. K.
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