Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Patent
1988-10-05
1990-03-20
Goldberg, Howard N.
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
295275, 29888046, 164 98, 164103, 164105, B22D 1900
Patent
active
049089234
ABSTRACT:
Method of dimensionally stabilizing the interface between metal parts of differing thermal expansion characteristics (TEC), regardless of temperature variations under normal designed use of such parts, comprising: (a) hot extruding a mixture of ceramic fibers (i.e., Si.sub.3 N.sub.4, SiC, Al.sub.2 O.sub.3) and a powder of the metal having the higher TEC (i.e., Al, Ti, Mg) while aligning the fibers generally along the direction of extrusion, to form an insert; (b) shaping the insert to align its fibers generally in at least one direction of anticipated thermal growth that may interfere with the interface; (c) casting the insert in place within a first part compound of the higher TEC metal and with the insert's fibers (i) oriented as above, and (ii) preheated to a temperature no greater than 35-45% of the temperature of the molten light metal; and (d) bringing together the first metal part with a second part of lower TEC metal (i.e., Fe or steel) to form the interface. The insert may be located in a mold in a manner to be totally enveloped by the molten light metal with the insert having a surface spaced a uniform, predetermined distance from the exterior of the cast light metal part, or the insert may be located to expose a surface thereof upon completion of the casting.
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Anderson Anthony T.
Donovan David A.
Cuda Irene
Ford Motor Company
Goldberg Howard N.
Malleck Joseph W.
May Roger L.
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