Cutting tool and method for making the same

Details Cutting tool and method for making the same Cutting tool and method for making the same

1997-09-25

2000-03-14

Rachuba, M.

Stone working

Sawing

Rotary

125 22, 761081, 83835, 83855, B28D 112

Patent

active

060358440

ABSTRACT:
A cutting tool is provided which includes a steel metal body and a cemented carbide cutting tip secured to the metal body by a metallic layer. The metallic layer has a high-strength metallic portion and a high-toughness metallic portion. The high-strength metallic portion is made of a metal having a thermal expansion rate between a thermal expansion rate of the metal body and the thermal expansion rate of the cutting tip. The high-toughness metallic portion is located between edge portions of a securing region of the metal body and the cutting tip and has toughness larger than that of the high-strength metallic portion. The cutting tool can decrease the possibility of cracks being generated at the edge portions of the securing region by selecting a thermal expansion rate of the metallic layer so as to decrease the thermal stress caused during the cooling process after welding, and further by positioning a high-toughness metallic layer at the edge portions of the securing region where stress is concentrated and positioning a high-strength metallic layer meeting the strength requirement at the remaining portion of the securing region.

REFERENCES:
patent: 4686080 (1987-08-01), Hara et al.
patent: 4951762 (1990-08-01), Lundell
patent: 5471970 (1995-12-01), Sakarcan
patent: 5662183 (1997-09-01), Fang

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