Screw with a partially hardened functional tip and process for the production thereof
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United States of America Patent
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Jul 24, 2007
Grant Date -
Nov 25, 2004
app pub date -
Apr 8, 2004
filing date -
Apr 8, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a process for the production of a screw comprising a low-alloy carbon steel, having a head, an adjoining holding portion and a functional tip which, in the outer region of limited radial depth, is of a greater hardness than the holding portion, in which the screw body is shaped by pressing and rolling and then the functional tip is subjected to a hardening operation, hardening is effected by momentary heating with a high level of energy transfer and subsequent quenching and is limited to portions of the periphery of the functional tip.
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