VITRIFIED SUPER-ABRASIVE-GRAIN GRINDSTONE

WIPO Patent Application WO/2013/108898

A1

This vitrified super-abrasive-grain grindstone (26) contains CBN abrasive grains (34) and diamond abrasive grains (36), the diamond abrasive grains (36) have an average grain size of 1/2 to 1/10 of that of the CBN abrasive grains (34), and have a toughness value that is in the range of 0.4-1 with respect to a value of 1 for the CBN abrasive grains (34). The abrasive grain dispersiveness of the CBN abrasive grains (34) is increased by means of such an average grain size of the diamond abrasive grains (36), grinding heat is efficiently absorbed by the grindstone by means of the presence of the diamond abrasive grains (36), which have a high thermal conductivity, and thus the generation of grinding heat is suppressed, suppressing deformation of the material (104) subjected to grinding. Also, the diamond abrasive grains (36) have a toughness value in the range of 0.4-1 with respect to a value of 1 for the CBN abrasive grains (34) and have an appropriate frangibility despite having a high Knoop hardness, thus suppressing a decrease in dressability and an increase in working resistance of a super-abrasive-grain grinding wheel (10) and increasing the durability life of the super-abrasive-grain grinding wheel (10).

MIZUNO AKIHIRO (JP)
IMAI NORIO (JP)
YOSHIMURA KOUICHI (JP)
MISHIMA TAKESHI (JP)

PCT/JP2013/050995

July 25, 2013

January 18, 2013

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NORITAKE CO LTD (JP)
MIZUNO AKIHIRO (JP)
IMAI NORIO (JP)
YOSHIMURA KOUICHI (JP)
MISHIMA TAKESHI (JP)

B24D3/00; B24D3/14; B24D5/06

WO2004061041A1

2004-07-22

JP2002178265A	2002-06-25
JP2000343438A	2000-12-12
JP2000158347A	2000-06-13
JPS4959387A	1974-06-08
JPH02274465A	1990-11-08
JPH06262527A	1994-09-20
JP2003025232A	2003-01-29

IKEDA Haruyuki et al. (JP)
Haruyuki Ikeda (JP)

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