Metal tools and implements – making – Blank or process – Saws
Patent
1993-01-11
1993-11-30
Parker, Roscoe V.
Metal tools and implements, making
Blank or process
Saws
761081, 76DIG2, B23D 6500
Patent
active
052655008
ABSTRACT:
A method of making a shock-resistant and wear-resistant composite steel tool comprises providing a steel tool body having a working edge, and providing a working part material of nonporous wrought steel in an unhardened state which is hardenable to a hardness greater than that of the body. The working part material, in its unhardened state, is fused by welding to the working edge of the tool body while being pressed forcibly against the working edge. After the fusion step, the outer surface of the working part material is hardened to a hardness greater than that of the body of the tool, the depth of penetration of such hardening being limited to the region immediately adjoining the outer surface of the material so that the underlying region of the working part remains ductile, and the weld is normalized thereby increasing its ductility and resultant shock resistance. The method is adaptable for economical high production of saw blades, cutting bits, and other tools of composite steel structure having hardened cutting tips or other hardened working parts.
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Gunzner Fred G.
Lanning John A.
Dalex, Inc.
Parker Roscoe V.
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