Method for the manufacture of hollow shafts
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United States of America Patent
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Nov 28, 2000
Grant Date -
N/A
app pub date -
Jul 29, 1999
filing date -
Jul 29, 1998
priority date (Note) -
Expired
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Abstract
A method for the production of hollow shafts from welded or seamlessly produced steel tubes having a maximum carbon content of 0.35% includes (1) carburizing a tube to a carbon content greater than 0.5%; (2) slowly cooling the carburized steel tube down from the process temperature, so that it undergoes no increase in hardness; (3) machining and/or non-cutting processing the carburized and soft steel tube to produce a workpiece blank; and (4) hardening the workpiece blank by local heating and quenching at desired points.
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