Superfinishing grindstone
AssigneeMinebea Co., Ltd.
InventorsKazuo Hokkirigawa, Motoharu Akiyama, Noriyuki Yoshimura
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Abstract
A superfinishing grindstone suitable for precision grinding, that contains either RB (rice bran) ceramic fine grains or CRB (carbonized rice bran) ceramic fine grains or a combination of both, for use as abrasive grains. The grains of RB ceramic fine grains and CRB ceramic fine grains have multiple small pores which allow the grains to be easily removed from a finished structure. These fine grains have a high Vickers hardness, which makes them highly resistant to bending, scratching, abrasion or cutting.
Claims14
A superfinishing grindstone comprising first abrasive grains and a binder, wherein said first abrasive grains comprise a material selected from the group consisting of RB (rice bran) ceramic fine grains and CRB (carbonized rice bran) ceramic fine grains.
A superfinishing grindstone comprising first abrasive grains and a binder,
- wherein said first abrasive grains comprise a material selected from the group consisting of RB ceramic fine grains and CRB ceramic fine grains, and
- wherein said binder comprises a vitrified bond.
A superfinishing grindstone comprising material obtained by steps of:
- kneading together while heating a material selected from the group consisting of RB ceramic fine grains and CRB ceramic fine grains;
- selecting one or more abrasive grains from the group consisting of diamond abrasive grains, boron nitride abrasive grains, zirconium abrasive grains, silica abrasive grains, silicon carbide abrasive grains, iron oxide abrasive grains, chrome oxide abrasive grains and cerium oxide abrasive grains;
- selecting one or more thermosetting resins from the group consisting of phenolic resin, diaryl phthalate resin, unsaturated polyester resin, epoxy resin, polyimide resin and triazine resin;
- mixing said material, said abrasive grain and said thermosetting resin to form a blend;
- pouring said blend into a mold;
- pressure forming said blend;
- removing said blend from said mold;
- heat-treating said blend at a temperature from 600° C. to 900° C.;
- and
- cooling said blend.
Dependencies are inferred from the claim text.