Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-10-01
1999-09-14
Ip, Sikyin
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148519, 148593, 148667, 148695, 464182, 464183, C22F 104
Patent
active
059517948
ABSTRACT:
Methods for making an aluminum drive shaft for automobiles or trucks or other drive shaft applications from aluminum alloy tube and methods for making drive shafts. The method includes providing an aluminum tube member is joined to drive shaft end members. The method includes the steps of (a) providing a 6000 series type alloy; (b) extruding the alloy within about 500.degree. to 800.degree. F. into a hollow elongate tube; (c) drawing the tube to a reduction of at least 15% in metal cross-sectional area; (d) solution heat treating the alloy at a temperature of at least about 990.degree. F. and then quenching; and (e) reducing the diameter of the tube and increasing the tube wall thickness to provide a relatively short tube length of reduced diameter, a transition section and thicker wall thickness at one or both ends of a drive shaft suitable length of said tube. The transition section has a non-linear wall. In a preferred embodiment, the transition section has central circumferential stiffener section. In a more preferred embodiment the central circumferential stiffener section has a slope of from 0.degree. to 5.degree.. The circumferential steps stiffen the transition section and prevents "oil canning" of the drive shaft under periods of high torque. The drive shafts can also be made of metals other than aluminum alloys.
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Aluminum Company of America
Ip Sikyin
Pearce-Smith David W.
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