| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for an excavating tool, which enables a cutting-edge tip to be firmly fixed to a mounting part of a tool body, even if a cutter, constituted of a diamond-sintered body, is arranged in a part on the side of the outer periphery of the top surface of the cutting-edge tip, and to provide the excavating tool. SOLUTION: In this manufacturing method for the excavating tool, wherein a plurality of cutting-edge tips 11 formed like a circular flat plate are mounted on the mounting part 3 provided on the leading end surface of the tool body, the cutting-edge tip 11 comprises a cutting-edge base body 12 and the cutter 14; the top-surface side of the cutter 14 serves as a cutter body 16 which comprises the diamond-sintered body; the undersurface side thereof serves as a seating part 15 which comprises cemented carbide; and the ratio of the outer periphery of the top surface of the cutting-edge tip 11 occupied by the cutter 14 is set in a range of≥20% and <50%. The manufacturing method comprises a first jointing step of making the cutting-edge base body 12 and the mounting part 3 brazed to each other, and a second jointing step of making the cutter 14 and the cutting-edge base body 12 brazed to each other, after the first jointing step. The brazing temperature of the first jointing step is set higher than that of the second jointing step. COPYRIGHT: (C)2007,JPO&INPIT
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