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1. 发明专利

JPH0751906A THROW-AWAY TIP 失效
公开(公告)号：JPH0751906A
公开(公告)日：1995-02-28
申请号：JP22510693
申请日：1993-08-17
申请人： DIJET IND CO LTD
发明人： TSUMURA TOSHIO , KURANISHI TETSUO
IPC分类号： B23B27/20
摘要： PURPOSE:To extend the service life of a tip that uses as a cutting edge a high- hardness sintered compact containing a diamond or a cubic system boron nitride, by preventing the occurrence of breakage or crack at a boundary portion between the base material and sintered compact tip portion. CONSTITUTION:In a cutting tool comprising a high-hardness sintered compact 2 containing a diamond or a cubic system boron nitride, the sintered compact 2 being bonded to a corner portion 11 of a base material 1 consisting of hard material, the end portion of the sintered compact 2 positioned at a vertical wall side of the base material 1 is chipped off to provide a tip.

2. 发明专利

JPH09234615A BORING DEVICE 失效
公开(公告)号：JPH09234615A
公开(公告)日：1997-09-09
申请号：JP7152996
申请日：1996-02-29
申请人： DIJET IND CO LTD
发明人： MIZUKI YOSHITOMO , KURANISHI TETSUO
IPC分类号： B23B51/08 , B23D77/00
摘要： PROBLEM TO BE SOLVED: To stably perform the excellent drilling for a long time in drilling a work made of non-ferrous metal such as aluminum alloy. SOLUTION: A drilling toll is provided with a pair of drill blades made of cemented carbide on each side of the center of rotation at a tip of a drill shaft 10, a discharging groove 12 to discharge the cut chip is provided on a forward side in the rotational direction of each drill blade, a reamer blade 14 made of super high-pressure sintered body is provided through an outer circumferential edge of each drill blade 11 and a groove 13, and a chamfering blade 15 inclined outwardly in the radial direction on a rear part side with the prescribed clearance from a tip of the drill shaft 10 on either of the outer circumferential edge of each drill blade 11 or the extension line of each reamer blade 14 is provided. A spot facing blade 16 made of super high-pressure sintered body is provided on a rear part side of the chamfering blade 15 on the outer circumferential edge of each drill blade 11 on which no chamfering blade 15 is provided or on the extension line of each reamer blade 14.

3. 发明专利

JPH10138031A MILLING TOOL 失效
公开(公告)号：JPH10138031A
公开(公告)日：1998-05-26
申请号：JP29659696
申请日：1996-11-08
申请人： DIJET IND CO LTD
发明人： MIZUKI YOSHITOMO , TANAKA AKIHIRO , KURANISHI TETSUO
IPC分类号： B23C5/10 , B27G13/02
摘要： PROBLEM TO BE SOLVED: To prevent small cutting edges between nicks from being damaged and chatter or the like from being caused by partially overlapping nicks of adjacent cutting edges among plural cutting edges on which nicks are arranged in a milling tool, and arranging wide nicks on the other cutting edges. SOLUTION: An end mill 10 has four strips of cutting edges 11, and in the respective cutting edges 11, nicks 12 are respectively arranged in a plurality through a necessary interval. In this case, positions of the nicks 12 in the first and the third cutting edges 11 are made to coincide with each other, and positiones of the nicks 12 in the second and the fourth cutting edges 11 are made to coincide with each other. In the adjacent cutting edges 11, the nicks 12 are made to respectively exist over a wider range than small cutting edges 11a on the other cutting edges 11 in positions corresponding to the small cutting edges 11a between the nicks 12 in one cutting edges 11, and the nicks 12 in the respective cutting edges 11 are overlapped with each other in a necessary width (d). Therefore, damage of the small cutting edges 11a is restrained, and the occurrence of chatter or the like is restrained.

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