Nachi - Fujikoshi Corporation

Hirokuni Amano

Masao Koshi

Yasushi Hara

Kiyoshi Nakagawa

Syunichi Asakura

Yuji Shimatani

Takashi Yoshimoto

A cutting tool having cutting edges made of a high speed tool steel exhibiting very high wear and anti-chipping resistances, and sufficient toughness is provided. The high speed tool steel consists essentially of by weight C:0.6 to 1.8%, Si:1.2% max, Mn:0.5% max, Cr:3.5 to 5.0%, Mo:10% max, W:21% max, V:2 to 4% and Co:7 to 10%, the balance being Fe and incidental impurities, and the steel of the cutting edge comprise MC-type carbide grains each having a maximum equal value diameter of a circle ranging substantially 5 to 14 &mgr;m, and the MC-type carbide grains having an equal value diameter of the circle ranging substantially 5 to 14 &mgr;m have a ratio between short and long diameters ranging over substantially 0.3.

Cutting tool

According to the present invention there is provided a wear resistant vane for alternate flow that is appropriate for a rotary compressor that employs HFC flow as an alternate refrigerant, and which vane possesses: a reciprocal or opposed characteristic in that it does not cause to wear a piston to which it contacts and nevertheless causes little wear to itself; a preferable corrosion resistance; and an ensured reliability, in that when employed for an operation that continues for an extended period of time there is no possibility of a surface layer suddenly peeling off. The present invention discloses a vane made of a wear resistant cermet alloy for alternate flow, comprising: 5 to 20% by weight of a binder phase composed mainly of Ni; a hard phase having a double phase structure having a core composed mainly of titanium carbide, titanium nitride and/or titanium carbonitride, and a rim phase encircling the core; and inevitable impurities; the hard phase containing 30 to 60% by weight of Ti, 10 to 30% by weight of W, 0.5 to 10% of Mo, 1 to 25% by weight of at least one of Ta, Nb, Cr, V and Zr, 2 to 5.4% by weight of N and 4 to 12% by weight of C, and being uniformly dispersed in an alloy phase; and further, an average core size of the core being 1.5 .mu.m or less and a maximum core size of the core being 5 .mu.m or less.

Wear resistant cermet alloy vane for alternate flon

Growing community of inventors

Toyama, Japan

Hirokuni Amano