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2. 发明专利

JP2000064789A ROLLER CUTTER 失效
公开(公告)号：JP2000064789A
公开(公告)日：2000-02-29
申请号：JP24081598
申请日：1998-08-26
申请人： MITSUBISHI MATERIALS CORP
发明人： KODERA SATOSHI , HISADA KIMIYA , TOFUN KAZUO
IPC分类号： E21B10/22 , E21D9/10
摘要： PROBLEM TO BE SOLVED: To provide a roller cutter, in which falling of cutting-edge tips can be prevented by inhibiting abrasion of a cutting edge section on the outer circumference of a cutter body and a lifetime can be lengthened by suppressing deterioration of excavation efficiency. SOLUTION: In the roller cutter, in which a cutter body 12, in which a cutting edge section 18 is installed on an outer circumference, is mounted rotatably on a supporting shaft 11 centering around the central axis of the cutter body 12, recessed grooves 19 crossing the cutting edge section 18 along a virtual plane P containing the above-mentioned central axis towards the above- mentioned central axis direction are formed to the cutting edge section 18 of the cutter body 12 at intervals in the circumferential direction. Tabular cutting-edge tips 20 are set up into the recessed grooves 19 by brazing while the side faces 20a of the cutting-edge tips 20 are exposed onto the side faces 18a of the cutting edge section 18.

7. 发明专利

JPH0224475A ROTOR BIT 失效
公开(公告)号：JPH0224475A
公开(公告)日：1990-01-26
申请号：JP8414189
申请日：1989-04-04
申请人： SANDVIK AB
发明人： HARII RENNAATO KARURUTSUSON
IPC分类号： E21B10/50 , E21B10/22 , E21B10/25 , F16J15/32
摘要： PURPOSE: To increase the freedom in material and processing in manufacturing process by constituting a sealing element sealing site from an independent sealing insert consisting of a material having a hardness greater than the core hardness of a pin. CONSTITUTION: This roller bit comprises a plurality of legs 10 each of which has a pin 11 for pivotally supporting a cutting cone 12 and sealing element sealing sites for bearing races 19-21 for the cone 12 and an O-ring 18 arranged thereon. The sealing site is formed of an independent sealing insert 17 consisting of a material having a hardness greater than the core hardness of the pin 1, and the sealing insert 17 is fixed to the pin 11.

8. 发明专利

JPH01230889A ROTARY CORN TYPE DRILL BIT 失效
公开(公告)号：JPH01230889A
公开(公告)日：1989-09-14
申请号：JP29445288
申请日：1988-11-21
申请人： EXXON PRODUCTION RESEARCH CO
发明人： ARUBAATO PURAMAA DEIBUISU JIYU , JIYOSEFU UEIN SUTOORU
IPC分类号： E21B10/08 , E21B10/22 , E21B12/02 , E21B44/00
摘要： PURPOSE: To most properly select bit replacing time by detecting wear of a support boundary surface between a cone and a spindle by a wear sensor arranged in the tip vicinity of a drill bit. CONSTITUTION: A wear sensor 24 is arranged on a cone 16 on the tip of a drill bit 12 to detect wear of a support boundary surface between the cone 16 and a spindle 14. When the wear exceeds a prescribed value, the wear sensor 24 starts to rotate together with the cone 16, and twists off a tensile force- applied linkage 26. Then, a flow resistance changing means 28 is energized according to it, and a flow rate and sending-out pressure of a drilling fluid largely change. When detecting this change by a drilling rig, a drill string is pulled up by an operator so that the drill bit 12 is replaced.

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