Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1985-06-05
1987-07-07
Rosenbaum, Mark
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
291573C, B27D 5302, B23P 1526
Patent
active
046777245
ABSTRACT:
This invention relates to a heat exchanger structure in which a passage for the cooling or heating fluid is formed. The inner surface of the passage is roughened, and provided with a plurality of lengthwise-extending, inwardly-projecting, linear or spiral, continuous or intermittent fins. The cooling or heating fluid is passed through the passage to promote an increase in the heat exchange rate. In order to manufacture such a heat exchanger structure, a pipe provided on its inner surface with a plurality of lengthwise-extending, inwardly-projecting, continuous or intermittent fins is inserted between a plurality of complementary members to combine these parts in the shape of a mold. The exposed portions of the joint surfaces of these complementary members and such portions of the complementary members and pipe are then hermetically vacuum-sealed. The resultant complementary members and pipe are diffusion-welded unitarily by the hot isotropic pressure welding. A nickel plate or a nickel alloy plate or a stainless steel plate, which is laminated on the portion of the assembled parts which requires to have the wear resisting properties is also diffusion-welded at the same time.
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Paton, et al, "Spontaneous Hermetic Sealing of Multilayer Blanks and Stacks During High Temperature Heating", Apr., 1980, Sou. Phys Dokl. 25(4), p. 304.
Golabi Irene Graves
Rosenbaum Mark
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