To provide a guide pad used in a drilling tool having long service life, low raw material cost, and superior machinability, and hardly ever having a thermal crack occur during brazing.
This drilling tool having a cutting edge at a tip has an abrasion resistant material contacting a machining face of a cut material cut by the cutting edge and stabilizing drilling on an outer periphery of the drilling tool in the rear part of the cutting edge. At least a surface part of this abrasion resistant material contains from five to 45 vol.% of cubic boron nitride particles having an average particle size from one of 100 μm which are not directly coupled to each other, and the rest comprises at least one of a cemented carbide or a cement. And it does not include an intermetallic compound formed from a plurality of elements selected from boride, nitride, and boride nitride of Al, Si, Co, and Ni, Ti, Al, Co, and Ni.
| JP2015033758 | SURFACE-COATED CUTTING TOOL |
| JPH01316108 | CEMENTED CARBIDE DRILL FOR PRINTED CIRCUITBOARD |
| WO/2003/018862 | METHOD FOR PRODUCING A NANOSTRUCTURED COATING |
TSUZUKI KATSUNORI
IKEGAYA AKIHIKO
NAKAMURA NAOHIRO
