Composite utility knife blade, and method of making such a blade
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United States of America Patent
Stats
-
Oct 23, 2012
Grant Date -
Jan 30, 2003
app pub date -
Jul 24, 2002
filing date -
Jul 26, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A composite utility knife blade and method of making such a blade involves butt joining a tool steel wire to a front edge of an alloy steel backing strip. The wire is electron beam welded to the backing strip to form a composite strip defining a first metal portion formed by the alloy steel backing strip, a second metal portion formed by the tool steel wire, and a weld region joining the first and second metal portions. The composite strip is annealed and hardened such that the first metal portion defines a surface hardness within the range of approximately 38 Rc to approximately 52 Rc, and the second metal portion defines a surface hardness within the range of approximately 60 Rc to approximately 75 Rc. The hardened strip is then tempered, quenched, surface treated to form a sharpened cutting edge, scored, and separated into a plurality of blades.
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