Title:
METHOD FOR HARDENING SURFACE OF CUTTING TOOL AND METALLIC MATERIAL
Document Type and Number:
Japanese Patent JPH1136083
Kind Code:
A
Abstract:
To provide a method for hardening the surfaces of cutting tools and metallic materials high in hardness, in which the depth of hardened layers is high, enbrittlement is prevented and broken-edge or the like are hard to occur.
The estimated part to form into an edge part 6 is melted by arc in a shield gas contg. 7 to 25 vol.% reactive gas and is thereafter solidified to allow solute atoms to enter into the edge part 6. By the solid solution strengthening, the edge part 6 is hardened. Since the ratio of the reactive gas is regulated to ≤25 vol.%, coarsened dendrite is not present on the edge part 6, and the toughness of the edge part 6 is maintained. Thus, it is applicable even to a cutting tool 5 sharp in the edge.
Inventors:
NISHIOKA TOSHIAKI
INABA TERUHIKO
NAGAIKE SHIGEKI
NAGAIKE HIROYUKI
INABA TERUHIKO
NAGAIKE SHIGEKI
NAGAIKE HIROYUKI
Application Number:
JP20851497A
Publication Date:
February 09, 1999
Filing Date:
July 16, 1997
Export Citation:
Assignee:
HYOGO PREFECTURE
MIKISHIYOU HAMONO HONPO KK
MIKISHIYOU HAMONO HONPO KK
International Classes:
B23P9/00; B23P15/40; C21D1/09; C21D9/18; C22F1/00; C22F1/18; C22F3/02; C23C26/00; (IPC1-7): C23C26/00; B23P9/00; B23P15/40; C21D1/09; C21D9/18; C22F1/18; C22F3/02
Attorney, Agent or Firm:
Yoshihiro Tsunoda
Yoshihiro Tsunoda (3 others)
Yoshihiro Tsunoda (3 others)
Previous Patent: MOVING TARGET IDENTIFICATION SONAR APPARATUS
Next Patent: TREATMENT OF METALLIC SURFACE TO BE COATED HAVING BRAZED WELD ZONE
Next Patent: TREATMENT OF METALLIC SURFACE TO BE COATED HAVING BRAZED WELD ZONE