Disco Corporation

Ryogo Maji

Ryuji Oshima

Yoshiki Ishiai

A production process of a polishing stone includes a glass sphere feeding step of feeding glass spheres into a mold, and a firing step of heating the mold with the glass spheres filled therein at a temperature higher than a softening point and lower than a melting point of the glass spheres, thereby forming a glass block as the polishing stone. In the firing step, the heating is stopped with air bubbles still dispersed and remaining in interstices between the glass spheres in a dispersed manner.

Production process of polishing stone and polishing stone

Disclosed herein is a cutting blade including diamond abrasive grains and boron compound grains. The average grain size of the diamond abrasive grains falls within the range of 5 &#x3bc;m to 50 &#x3bc;m. The average grain size of the boron compound grains is greater than &#x2155; and less than or equal to &#xbd; of the average grain size of the diamond abrasive grains.

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Tokyo, Japan

Ryogo Maji