WO2014136575A1 - Foret pour matériau composite, procédé d'usinage et dispositif d'usinage l'utilisant - Google Patents

Foret pour matériau composite, procédé d'usinage et dispositif d'usinage l'utilisant Download PDF

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Publication number
WO2014136575A1
WO2014136575A1 PCT/JP2014/053870 JP2014053870W WO2014136575A1 WO 2014136575 A1 WO2014136575 A1 WO 2014136575A1 JP 2014053870 W JP2014053870 W JP 2014053870W WO 2014136575 A1 WO2014136575 A1 WO 2014136575A1
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Prior art keywords
drill
tip
end side
cutting edge
diameter
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PCT/JP2014/053870
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English (en)
Japanese (ja)
Inventor
浩文 嶋田
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福井県
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Application filed by 福井県 filed Critical 福井県
Publication of WO2014136575A1 publication Critical patent/WO2014136575A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/02—Twist drills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B2226/00—Materials of tools or workpieces not comprising a metal
    • B23B2226/27—Composites
    • B23B2226/275—Carbon fibre reinforced carbon composites

Definitions

  • the present invention is particularly suitable as a through-hole drilling tool for composite materials such as CFRP (Carbon Fiber Reinforced Plastics) or CFRTP (Carbon Fiber Reinforced Thermoplastics) such as fiber reinforced composite materials represented by thermoplastic carbon fiber reinforced plastics.
  • CFRP Carbon Fiber Reinforced Plastics
  • CFRTP Carbon Fiber Reinforced Thermoplastics
  • a suitable drill more specifically, forming a so-called burr at the opening of the through hole in one drilling operation and forming a high-quality through hole that does not cause delamination or surface peeling on the through surface on the side of the through hole.
  • the present invention relates to a drill for composite materials.
  • a drill for FPC Flexible Printed Circuits
  • the blade portion is formed of any one of cemented carbide, cermet, ceramics, ultra-high pressure sintered body, or a material coated with a hard coating.
  • the flank is formed by the second flank and the third flank, and the flank angle of the third flank is set to 33 to 50 °. Therefore, the length of the cutting edge on the outer peripheral side of the chisel blade is shortened to reduce the width of the chip generated by the cutting edge, thereby improving the chip discharging performance and causing the poor discharging performance.
  • flash which becomes and can be suppressed.
  • Patent Document 2 as a drill suitable for CFRP drilling, it has a shape having a prepared hole processed part for machining a prepared hole and a finished part, and the diameter difference between the finished part and the prepared hole processed part is set to 0.1 mm or more and 2 mm or less.
  • a two-stage drill is disclosed.
  • Patent Document 3 a front end portion on which a front end cutting edge is formed and a rear end side outer diameter that is formed to be connected to the rear end side of the front end portion and larger in diameter than the front end side outer diameter and the front end side outer diameter. It is possible to form a taper part formed in a tapered shape with a difference in diameter and a finishing diameter larger than the outer diameter on the rear end side of the taper part while being connected to the rear end side of the taper part. And a straight portion having the same diameter as the whole, and a peripherally cutting edge spirally twisted is formed on the outer periphery of the tapered portion so that the drilling diameter is continuously increased. Is disclosed.
  • Carbon fiber reinforced composite material especially CFRTP, is lightweight and has high strength and rigidity, and is easy to mold, so it is widely used for automobile parts and notebook PC cases.
  • CFRTP generally has a structure in which sheets of carbon fiber impregnated with a thermoplastic resin material impregnated with hard and hard to cut are laminated in layers. Since the thermoplastic resin material has the property of softening at about 140 ° C., if the heat generation during drilling is not suppressed as much as possible, the chips softened by the heat generation will enter the through-hole entrance (opening on the drilling start surface side). To become solidified. In addition, the fibers come out and become easy to wind around the drill, and further cause processing defects such as generation of uncut parts, fluffing, and delamination due to a reduction in cutting ability due to cutting edge wear.
  • CFRTP which has a layered structure, is likely to generate burrs at the through-hole entrance and through-hole exit (opening on the side opposite to the drilling start surface), and delamination occurs due to the thrust force during processing. Since it is easy, it is difficult for the drills disclosed in Patent Documents 1 and 2 to perform drilling to a practically sufficient level.
  • the “thrust force” is a force applied in the direction opposite to the drill feed direction in drilling.
  • the drill disclosed in Patent Document 3 drills by rotating clockwise when the twist direction of the helical chip discharge groove formed along the outer peripheral cutting edge of the tapered portion is right-handed.
  • the cutting blade 200 is provided in the same direction as the drill rotation direction, and the cutting operation is performed in the tapered portion so as to go from the tip portion side of the chip discharge groove to the straight portion side. Then, the chips generated by the cutting operation move to the straight portion along the twist direction by the rotating action of the drill and are discharged on the shank side.
  • chips are welded to the chip discharge groove due to the influence of heat generated during the drilling process, or softened chips are discharged to the through hole inlet side and the through holes are formed. It is unavoidable that welding is performed around the opening.
  • the present invention has been made in view of the above problems, and suppresses welding and solidification so that chips are raised during drilling, and has high quality without causing almost any burrs or delamination on the workpiece.
  • An object of the present invention is to provide a composite material drill capable of drilling through holes.
  • the composite material drill according to the present invention is a composite material drill for perforating a workpiece including at least a part of a fiber reinforced composite material, the tip portion having a tip cutting edge formed thereon, and the rear portion of the tip portion.
  • a tapered portion formed in a tapered shape by being connected to the end side and having a diameter difference between the distal end side outer diameter and the rear end side outer diameter larger than the distal end side outer diameter; and the rear end of the tapered portion A straight portion that is formed on the same side so as to be able to form a finishing diameter larger than the outer diameter on the rear end side of the taper portion, and connected to the side.
  • a spirally twisted chip discharge groove is formed on the outer periphery of the taper portion, and an outer peripheral cutting edge is formed along an edge of the chip discharge groove on the straight portion side, so that a continuous drilling diameter is increased. Is set by the outer peripheral cutting edge. Operation by rotating the drill to take place, characterized in that it induces the chips produced by the cutting operation to face the drilling direction in the chip discharge groove. Further, the tip cutting edge of the tip portion has a tip angle of 60 ° to 140 °, and the center portion of the blade surface protrudes 0.5 mm or more from the cutting blade surface in the axial direction.
  • the taper angle between the outer diameter line in contact with the outer diameter on the front end side and the outer diameter on the rear end side and the center line of the drill shaft is set to 45 ° or less.
  • the entire taper portion is formed in the shape of a round land drill having the same diameter so that the taper portion can be formed to have a diameter that is 0.01 mm to 0.1 mm larger than the outer diameter on the rear end side.
  • the rake angle is set to 0 ° to 20 ° and the clearance angle is set to 5 ° to 20 °, and the chip discharge groove is formed with a twist angle of 60 ° or less.
  • the tip portion, the taper portion, and the straight portion are integrated coaxially.
  • the axial center of the tip part, the taper part, and the straight part is made to coincide with the rotational axis. Furthermore, a flow path is formed along the center axis of rotation in the tapered portion and the straight portion while opening at the distal end portion, and air or cutting oil flowing through the flow channel is ejected at the distal end portion. .
  • the machining method according to the present invention is a machining method for drilling a workpiece including at least a part of a fiber-reinforced composite material using the above-described drill, wherein the tip cutting edge and the taper portion of the tip portion A prepared hole is drilled in the workpiece by the outer peripheral cutting edge, and the formed prepared hole is subjected to finishing by the straight portion and drilled.
  • a machining apparatus includes a driving unit that holds the above-described drill and rotationally drives the central axis of the drill, and a supporting unit that supports a workpiece including at least a part of a fiber-reinforced composite material. And a moving means for relatively moving the drive means and / or the support means so as to drill the drill into the workpiece.
  • the drill for composite material according to the present invention is processed while expanding the diameter while keeping the cutting resistance low by performing the pilot hole machining with the tapered portion, burrs are unlikely to occur around the through-hole outlet, and the plate of the workpiece Thrust force applied in the thickness direction is also reduced. Therefore, when perforating a CFRTP having a laminated structure, the peeling force with respect to the laminated boundary surface is reduced, and delamination hardly occurs.
  • a cutting operation is performed by the outer peripheral cutting edge by forming a spirally twisted chip discharge groove on the outer periphery of the tapered portion and forming an outer peripheral cutting edge along the edge on the straight portion side of the chip discharge groove.
  • FIG. 2 is a cross-sectional view taken along line AA in FIG. 1.
  • FIG. 3 is a cross-sectional view taken along line BB in FIG. 1.
  • It is a side view regarding the modification of embodiment shown in FIG. It is explanatory drawing regarding the difference with the cutting action of the conventional straight twist drill and the drill of this invention. It is explanatory drawing regarding the machining method at the time of using the drill which concerns on this invention. It is an external appearance perspective view which shows an example of the machining apparatus using the drill which concerns on this invention. It is explanatory drawing regarding the cutting operation of the conventional drill.
  • FIG. 1 is a side view of an embodiment according to the present invention.
  • FIG. 2 is a front view relating to the tip of the drill shown in FIG. 3 is a cross-sectional view taken along the line AA in FIG. 4 is a cross-sectional view taken along line BB in FIG.
  • FIG. 5 is an enlarged cross-sectional view relating to the outer peripheral cutting edge of the drill shown in FIG. 1.
  • the drill 1 is a right-handed, left-rotating drill, and is formed into a tip portion 5 that is a tip portion, a tapered portion 4 that has an outer peripheral cutting edge 7, and a round land drill shape.
  • the straight portion 3 and the shank 2 are connected and integrated on the same axis.
  • the drill 1 is a two-blade drill, in which the straight portion 3 is connected to the tip of the shank 2, and the tapered portion 4 is connected to the tip of the straight portion 3 integrally.
  • the taper part 4, the straight part 3, and the shank 2 are connected with a tolerance of coaxiality 0.01.
  • the taper portion 4 has a tapered shape formed by a difference in diameter between the front end side outer diameter D1 and the rear end side outer diameter D2, and the straight portion 3 is integrally connected to the rear end side.
  • the straight portion 3 is formed to be equal to or larger than the outer diameter D2 of the taper portion 4 rear end side.
  • a tip cutting edge 5 having a tip angle ⁇ 1 is connected to the tip end side of the taper portion 4.
  • the tapered outer periphery formed from the front end side outer diameter D1 to the rear end side outer diameter D2 of the taper portion 4 is formed with two helically twisted chip discharge grooves 6.
  • An outer peripheral cutting edge 7 twisted in a spiral shape is formed at the edge on the straight portion 3 side, and is set so that the perforation diameter continuously increases.
  • the straight portion 3 is formed in an end mill shape in order to shape a portion left uncut by the tapered portion 4 which is a prepared hole processing portion.
  • the tip cutting edge 5 which is the tip has a tip angle of 60 ° to 140 °, and the center portion of the blade edge surface protrudes 0.5 mm or more from the cutting blade surface in the axial direction,
  • the ridgelines 9 and 10 form a tip angle ⁇ 1, and the tip angle ⁇ 1 is set in a range of 60 ° to 140 °.
  • chip discharge grooves 6 are continuously formed on the outer circumferences of the taper portion 4 and the straight portion 3 in a spiral shape with a twist angle ⁇ 3 opposite to the drill rotation direction.
  • the twist angle ⁇ 3 of the chip discharge groove 6 depends on the size of the tip angle and the material of the workpiece, but it can be set to 60 ° or less in order to prevent the cutting edge from becoming too sharp and easily chipped.
  • the chips containing the fiber material of the composite material can be quickly discharged by setting the angle to 60 ° or less.
  • the outer peripheral cutting edge 7 of the tapered portion 4 that is the prepared hole processing portion is not provided with a margin 8 as shown in FIG. 3, and the rake angle ⁇ 5 and the clearance with respect to the conical surface in contact with the land outer periphery of the tapered portion 4 are provided.
  • Each angle ⁇ 4 is set in the range of 5 ° to 20 °.
  • the outer periphery cutting blade 7 is helically twisted and formed so that the edge by the side of the straight part 3 of the chip discharge groove 6 may be followed.
  • the taper angle ⁇ 2 resulting from the diameter difference between the front end side outer diameter D1 and the rear end side outer diameter D2 of the taper portion 4 is set to 45 ° or less.
  • the taper angle ⁇ 2 is greater than 45 °, the thrust resistance exceeds the rotational force, so that a large burr is generated and cannot be reliably removed at the straight portion.
  • the length L1 from the front end side outer diameter D1 to the rear end side outer diameter D2 of the taper portion 4 is determined by the taper angle ⁇ 2.
  • FIG. 4 is a cross-sectional view of the straight portion 3 when the BB cross section shown in FIG. 1 is viewed from the rear end side of the straight portion 3 toward the tapered portion 4.
  • the straight portion 3 is formed in the shape of a round land drill, and is formed to have a finishing diameter D3 equal to or larger than the rear end side outer diameter D2 of the tapered portion 4, and preferably 0.01 to 0.1 mm larger.
  • the axial centers of the tip cutting edge 5, the taper portion 4 and the straight portion 3 are aligned with the drill rotation axis, and the connecting portion between the taper portion 4 and the straight portion 3 has an outer diameter on the tip side of the straight portion 3 which is the taper portion 4. They are connected in a tapered or curved shape with a reduced diameter toward the rear end side outer diameter.
  • the tip cutting edge 5, the taper portion 4, the straight portion 3, and the shank 2 are integrated with a tolerance of coaxiality 0.01.
  • the surface of the drill 1 body is covered with a coating 12 made of diamond, as shown in FIG.
  • the coating 12 can be formed by, for example, a well-known CVD method or PVD method, and may be a DLC film.
  • Drills specializing in the processing of composite materials such as fiber reinforced resin materials need to sharpen the cutting edge and improve sharpness.
  • the cutting edge radius can be reduced.
  • the coating 12 with nano diamond coating the outer peripheral cutting edge has a good sharpness without increasing the diameter of the cutting edge radius.
  • the outer peripheral cutting edge has a good sharpness without increasing the diameter of the cutting edge radius. Can be maintained for a long time. Further, even when the sharpness is deteriorated due to wear of the blade edge or the like, since the burr generated during the drilling of the pilot hole can be effectively removed by the straight portion 3, high-precision drilling can be stably performed. .
  • the material to be drilled by the drill 1 is preferably a fiber reinforced composite material.
  • CFRTP thermoplastic carbon fiber reinforced plastic
  • CFRP thermosetting carbon fiber reinforced plastic jar
  • a glass fiber reinforced material examples thereof include a plastic cage (GFRP), a glass long fiber reinforced plastic (GMT) cage, a boron fiber reinforced plastic cage (BFRP), an aramid fiber reinforced plastic cage (AFRP, KFRP), and a polyethylene fiber reinforced plastic cage (DFRP).
  • Such fiber reinforced composite materials include reinforcing fibers in a matrix resin, and various forms have been developed. For example, what is provided with the layer structure which aligned the reinforcing fiber which consists of a long fiber in a predetermined direction, and was laminated
  • FIG. 6 is a side view of a modification of the embodiment shown in FIG.
  • a flow path 11 is formed along the rotation center axis inside the tapered portion 4 and the straight portion 3 while opening at the tip cutting edge 5 which is a tip portion.
  • fluid such as air or cutting oil can be ejected from the tip portion.
  • the flow path 11 shown in FIG. 6 has a straight shape, it can also have a spiral twisted shape.
  • the cutting edge of the outer peripheral cutting edge 7 faces obliquely downward with respect to the rotation direction. Is guided in the drilling direction while moving toward the center of the chip discharge groove 6. Therefore, chips are not discharged and stayed in the peripheral portion of the through-hole inlet, and it is possible to suppress the welding and solidification so that the chips rise.
  • chips in the chip discharge groove 6 are blown and scattered along the chip discharge groove 6 at a peripheral portion of the through hole entrance. Chips are discharged without stagnation. Further, chips are efficiently discharged without clogging the cutting surface with which the tip cutting edge 5 and the outer peripheral cutting edge 7 abut. Furthermore, since the drill body is cooled by the air or cutting oil jetted, it is effective when drilling a material that is easily softened by heat, such as a thermoplastic resin material.
  • the drill shown in FIG. 6 is particularly effective when the processing time until penetration is long, such as when the workpiece is thick.
  • FIG. 7 is a diagram illustrating the difference in cutting action between a conventional straight twist drill and the drill of the present invention.
  • FIG. 7A shows a cutting mechanism of a straight twist drill, in which a linear blade provided at the tip rotates in the rotation direction indicated by the arrow to cut in the axial direction, and is cut with a scissors.
  • FIG.7 (b) is explanatory drawing regarding the cutting action by the drill of this invention, and part B2 cuts similarly to the cutting action of a straight twist drill, but for inducing the outer periphery cutting edge provided in the taper part. It also plays a role in improving centripetality.
  • Part B ⁇ b> 1 shows the cutting action by the outer peripheral cutting edge 7 of the taper part 4.
  • the outer peripheral cutting edge 7 formed in the taper portion 4 has an arc shape when viewed from the axial direction, and is formed into a spiral shape and a tapered shape as a whole. Cutting by point contact is continuously performed on the material, generating powdery chips and contributing to reducing wear on the outer peripheral cutting edge. Further, the outer peripheral cutting edge has the same cutting action as that of cutting with a knife due to the inclination by the twist angle and the rotation of the cutting edge along the outer peripheral surface direction accompanying the drill rotation, and a sharp cutting edge is obtained. Further, since the outer peripheral cutting edge is spiral and formed in a tapered shape as a whole, the total extension of the cutting edge for expanding the diameter can be taken longer, which contributes to the improvement of the tool life.
  • the cutting edge of the outer peripheral cutting edge 7 faces obliquely downward with respect to the rotation direction, so that the cut chips move in the chip discharge groove 6 in the drilling direction. Be guided. As a result, the chips are prevented from being discharged from the through-hole inlet, and hardly stay in the periphery.
  • FIG. 8 is an explanatory diagram relating to a machining method when the drill according to the present invention is used.
  • FIG. 8A shows a state immediately before the start of drilling, and the tip of the drill 1 is set so as to abut on the plate-shaped workpiece M vertically.
  • the rotation direction of the drill 1 is set to a direction in which the outer peripheral cutting edge performs a cutting operation.
  • FIG. 8 (b) while the drill 1 rotates, the tip cutting edge of the tip portion first bites the workpiece M (eg, fiber reinforced composite material), and the outer periphery of the taper portion is cut. Induction of diameter expansion with a blade.
  • FIG. 8A shows a state immediately before the start of drilling, and the tip of the drill 1 is set so as to abut on the plate-shaped workpiece M vertically.
  • the rotation direction of the drill 1 is set to a direction in which the outer peripheral cutting edge performs a cutting operation.
  • FIG. 8 (b) while the drill 1 rotates, the tip cutting
  • the taper portion enters the workpiece M while the drill 1 is rotated, and diameter expansion processing is performed by the outer peripheral cutting edge.
  • the prepared hole is machined without causing delamination and burrs in the machined portion, and the chips are guided in the chip discharge groove in the drilling direction and are hardly discharged to the peripheral part of the through hole inlet. Therefore, stable drilling with an outer peripheral cutting edge is performed without welding and solidifying so that chips are raised at the peripheral portion of the through hole entrance.
  • FIG. 8D the straight portion enters the workpiece while the drill 1 rotates, and finishing is performed. Then, after the straight portion is removed from the workpiece M while finishing, the drill 1 is pulled up and the drilling process is completed.
  • FIG. 9 is an external perspective view of a machining apparatus using the drill according to the present invention.
  • the machining apparatus 100 includes a moving means including a XYZ three-axis movable mechanism by a ball screw mechanism or a linear motor mechanism and a five-axis mechanism to which a rotation mechanism around the X and Y axes is added.
  • the Z-axis moving mechanism 101 supports the drill 104 attached to the spindle shaft 103 and moves it up and down.
  • a ball screw mechanism or a linear motor mechanism is used as the moving means.
  • the Z-axis moving mechanism 101 includes a drive source that rotationally drives the spindle shaft 103.
  • the XY axis moving mechanism 102 moves the installation table to the X axis, the Y axis, or the XY compound axis.
  • a ball screw mechanism or a linear motor mechanism is used as the moving means.
  • a support tool 106 such as a vise or a restraining jig is disposed on the installation table, and a workpiece 105 made of a fiber reinforced composite material or the like is placed and fixed on the support tool 106.
  • the XY axis moving mechanism 102 is driven by a ball screw mechanism or a linear motor mechanism.
  • the Z-axis moving mechanism 101 and the XY-axis moving mechanism 102 are controlled to perform drilling while rotating the drill 104 with respect to the workpiece 105.
  • the support tool 106 what has the function to pinch
  • the spindle axis may be arranged on the X axis or the Y axis.
  • the cutting resistance and the drilling are achieved by forming a drill in which the tip cutting edge of the tip portion, the outer peripheral cutting edge of the taper portion, the chip discharge groove, and the outer peripheral cutting edge of the straight portion are integrated.
  • a fiber-reinforced composite material drill that reduces machining heat, suppresses chipping and solidification of chips around the through-hole inlet and through-hole outlet, and realizes high-precision drilling with almost no burr or delamination Is obtained.

Abstract

La présente invention porte sur un foret pour matériaux composites, qui réduit à un minimum la fusion et la solidification de copeaux de telle sorte que les copeaux montent pendant le perçage, et qui apporte la possibilité de percer sans provoquer de bavures ni de décollement des couches dans un matériau usiné. Elle a pour objet un foret (1) pour matériaux composites, qui comprend une partie de pointe sur laquelle est formée une lame de coupe de pointe (5), une partie effilée (4) qui est reliée au côté d'extrémité arrière de la section de pointe et qui est formée de manière à présenter une forme effilée, et une section droite de même diamètre (3) qui est reliée au côté d'extrémité arrière de la partie effilée (4) et qui forme un diamètre usiné fini qui est égal ou supérieur au diamètre extérieur du côté d'extrémité arrière de la section effilée (4). Une goujure de décharge de copeau (6), qui a une forme en spirale torsadée, est formée sur la périphérie extérieure de la section effilée (4), et une lame de coupe périphérique extérieure (7) est formée le long de l'arête du côté de la section droite (3) de la goujure de décharge de copeau (6) et est conçue de telle sorte que le diamètre de perçage augmente de façon continue.
PCT/JP2014/053870 2013-03-08 2014-02-19 Foret pour matériau composite, procédé d'usinage et dispositif d'usinage l'utilisant WO2014136575A1 (fr)

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JP2013046279A JP5476590B1 (ja) 2013-03-08 2013-03-08 複合材料用ドリル並びにそれを用いた機械加工方法及び機械加工装置
JP2013-046279 2013-03-08

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Cited By (4)

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CN104384577A (zh) * 2014-11-10 2015-03-04 苏州阿诺精密切削技术股份有限公司 一种多工况麻花钻头
JP2017113361A (ja) * 2015-12-25 2017-06-29 マニー株式会社 歯科用根管切削具
CN109226835A (zh) * 2018-11-02 2019-01-18 常州市海力工具有限公司 一种微纳复合涂层的阶梯钻结构
EP3970890A4 (fr) * 2019-06-26 2023-06-21 Bic Tool Co., Ltd. Foret pour matériau composite à fibres de carbone

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CN105034076B (zh) * 2015-08-18 2016-07-27 大连理工大学 一种纤维增强复合材料高效制孔的专用刀具
DE102019202165B4 (de) * 2019-02-19 2022-10-27 Kennametal Inc. Bohrer und Verfahren zur Bearbeitung eines Werkstücks

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JPS62148110A (ja) * 1985-12-17 1987-07-02 Honda Motor Co Ltd 油路付きドリル
JPH02237709A (ja) * 1989-03-09 1990-09-20 Mitsubishi Heavy Ind Ltd ツイストドリル
EP0836919B1 (fr) * 1996-09-21 2004-01-02 Black & Decker Inc. Foret
JP2011104766A (ja) * 2009-10-21 2011-06-02 Fukui Prefecture 複合材料用ドリル並びにそれを用いた機械加工方法及び機械加工装置

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JP5184902B2 (ja) * 2008-01-23 2013-04-17 住友電気工業株式会社 繊維強化複合材の穴あけ工具と穴あけ方法

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JPS62148110A (ja) * 1985-12-17 1987-07-02 Honda Motor Co Ltd 油路付きドリル
JPH02237709A (ja) * 1989-03-09 1990-09-20 Mitsubishi Heavy Ind Ltd ツイストドリル
EP0836919B1 (fr) * 1996-09-21 2004-01-02 Black & Decker Inc. Foret
JP2011104766A (ja) * 2009-10-21 2011-06-02 Fukui Prefecture 複合材料用ドリル並びにそれを用いた機械加工方法及び機械加工装置

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104384577A (zh) * 2014-11-10 2015-03-04 苏州阿诺精密切削技术股份有限公司 一种多工况麻花钻头
JP2017113361A (ja) * 2015-12-25 2017-06-29 マニー株式会社 歯科用根管切削具
CN109226835A (zh) * 2018-11-02 2019-01-18 常州市海力工具有限公司 一种微纳复合涂层的阶梯钻结构
EP3970890A4 (fr) * 2019-06-26 2023-06-21 Bic Tool Co., Ltd. Foret pour matériau composite à fibres de carbone

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