Abrasive and boring method using the same
AssigneesMitsubishi Materials Corporation, Nippon Diamond Co., Ltd.
InventorsShigeru Mazaki, Tsuyoshi Kawahara
Life of this patent
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Abstract
The present invention relates to an abrasive that decreases the heat generation by a core bit due to boring and allows the boring of a deep hole while maintaining the boring speed even when a deep hole is cut using a dry method. This abrasive contains abrasive grains, particles of anhydrous silica having a particle diameter from 5 nm to 50 nm and silanol groups in the surface thereof, and hydrous resin which discharges water when the hydrous resin is pressed by a core bit or the temperature of the hydrous resin rises. The abrasive 51 is supplied between the distal end of a rotating core bit 11 and a working material 20.
Claims7
An abrasive supplied between diamond segments of a core bit and a working material to be bored by the core bit in order to dress the diamond segments, the diamond segments having diamond grains supported by a binder, the abrasive comprising:
- abrasive grains;
- and
- particles of anhydrous silica having a particle diameter from 5 nm to 50 nm and silanol groups in the surface thereof.
An abrasive supplied between diamond segments of a core bit and a working material to be bored by the core bit in order to dress the diamond segments, the diamond segments having diamond grains supported by a binder, the abrasive comprising:
- abrasive grains;
- and
- a hydrous resin which discharges water when the hydrous resin is pressed by the diamond segments or the temperature of the hydrous resin rises.
An abrasive supplied between diamond segments of a core bit and a working material to be bored by the core bit in order to dress the diamond segments, the diamond segments having diamond grains supported by a binder, the abrasive comprising abrasive grains and a sublimate.
A boring method comprising:
- rotating a core bit which has a cylindrical shank and diamond segments provided on an end of the shank, the diamond segments having diamond grains supported by a binder;
- pressing the diamond segments against a working material in order to bore the working material;
- and
- supplying abrasive between the core bit and the working material to thereby dress the diamond segments, the abrasive including abrasive grains and at least one of:
- particles of anhydrous silica having a particle diameter from 5 nm to 5 nm with particles of silanol groups in the surface thereof;
- a hydrous resin which discharges water when the hydrous resin is pressed by the diamond segments or the temperature of the hydrous resin rises;
- and
- a sublimate.
Dependencies are inferred from the claim text.