Title:
DRILL TO WHICH CBN SINTERED BODY IS JOINED
Document Type and Number:
WIPO Patent Application WO/2005/105349
Kind Code:
A1
Abstract:
[PROBLEMS] To provide a drill having an edge with excellent strength and wear resistance less causing chipping at cutting edges and capable of cutting for a long period even if the drill is used for cutting a hard-to-cut material such as cast iron. [MEANS FOR SOLVING PROBLEMS] In the drill with the pair of cutting edges, cubic boron nitride sintered bodies are brazed to a carbide tool base metal on the drill outer peripheral sides of the pair of cutting edges, the length of the front cutting edge of the cubic boron nitride sintered body (a) joined to one edge of the pair of cutting edges and the length of the front cutting edge of the cubic boron nitride sintered body (b) joined to the other cutting edge are differentiated from each other, and a difference in the lengths of the front cutting edges between the cubic boron nitride sintered bodies (a) and (b) is set to 0.3 mm or longer.
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Inventors:
Kanada, Yasuyuki c/o Sumitomo Electric Hardmetal Corp. (1-1 Koyakita 1-chom, Itami-shi Hyogo 16, 66400, JP)
Application Number:
PCT/JP2004/005659
Publication Date:
November 10, 2005
Filing Date:
April 28, 2004
Export Citation:
Assignee:
SUMITOMO ELECTRIC HARDMETAL CORP. (1-1 Koyakita 1-chome, Itami-shi, Hyogo 16, 66400, JP)
Kanada, Yasuyuki c/o Sumitomo Electric Hardmetal Corp. (1-1 Koyakita 1-chom, Itami-shi Hyogo 16, 66400, JP)
Kanada, Yasuyuki c/o Sumitomo Electric Hardmetal Corp. (1-1 Koyakita 1-chom, Itami-shi Hyogo 16, 66400, JP)
International Classes:
B23B51/00; (IPC1-7): B23B51/00
Attorney, Agent or Firm:
Hagiwara, Ryoichi (JC Bldg, 4F 22-12, Nishi-Shinbashi 1-chom, Minato-ku Tokyo, 105-0003, JP)
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