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WO2017034032A1 - Foret à trois lames - Google Patents

Foret à trois lames Download PDF

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Publication number
WO2017034032A1
WO2017034032A1 PCT/JP2016/075086 JP2016075086W WO2017034032A1 WO 2017034032 A1 WO2017034032 A1 WO 2017034032A1 JP 2016075086 W JP2016075086 W JP 2016075086W WO 2017034032 A1 WO2017034032 A1 WO 2017034032A1
Authority
WO
WIPO (PCT)
Prior art keywords
thinning
cutting edge
drill
blade
tip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/075086
Other languages
English (en)
Japanese (ja)
Inventor
高一 新井
義一 新井
勝世 木村
智 手嶋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BIC Tool Co Ltd
Original Assignee
BIC Tool Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BIC Tool Co Ltd filed Critical BIC Tool Co Ltd
Priority to JP2016572849A priority Critical patent/JP6235737B2/ja
Publication of WO2017034032A1 publication Critical patent/WO2017034032A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • 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

Definitions

  • the present invention relates to a three-flute drill, and more particularly to a three-flute drill with a cutting edge that is difficult to slide and has a low cutting resistance.
  • FIGS. 1 (a), (b), and (c) Examples of a conventional three-edged drill are shown in FIGS. 1 (a), (b), and (c).
  • 1A is a front view of the tip of the blade edge
  • FIG. 1B is a side view seen from the direction A in FIG. 1A
  • FIG. 1C is the view in FIG. It is the side view seen from the B direction.
  • three thinnings 101a, 101b, 101c are equally applied toward the center of the drill to form thinning cutting edges 111a, 111b, 111c from the vicinity of the center of the drill toward the outer periphery.
  • the centripetal force and cutting force are secured.
  • This shape has an advantage that the center part is difficult to slip because the center part is a point (see, for example, Patent Documents 1 and 2).
  • the portions of the ridge lines 105a, 105b, and 105c remaining at the time of the thinning process remain in the shape of a triangular pyramid, and the center of the tip becomes the apex of the triangular pyramid, so there is no clear cutting edge at the center. (Location surrounded by a broken line in FIG. 1A).
  • the distance from the central part to the thinning that becomes the cutting edge is long, and the triangular pyramid rotates instead of the cutting edge until the point that acts as the cutting edge. For this reason, a large cutting resistance is generated in the center, and problems such as heat generation during drilling occur.
  • there is no cutting force due to the absence of the cutting edge it is necessary to drill with more force than necessary. Further, if the thinning is deepened, the strength of the tip is reduced, which causes breakage.
  • the feature of the form of this three-blade drill is as follows. 1. A rake angle exists in the thinning cutting edge except for the triangular pyramid portion at the center. 2. The cutting edge has a rake angle due to thinning. 3. The cutting edge extends radially from the center of the drill in three directions and in a straight line to the outer periphery. 4). The rake angle of the cutting edge can be set arbitrarily. 5). Since there is no cutting edge in the center and the ridge line of the triangular pyramid rotates while contacting, the cutting resistance is large, a large force is required for cutting, and the heat generation is large. 6). If the cutting force at the center is reduced, the force required for cutting will be drastically reduced.
  • Fig. 2 shows the one with the center narrowed to the minimum in order to solve the above-mentioned problems of the conventional three-blade drill.
  • the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a three-blade drill in which the cutting edge is difficult to slip and the cutting resistance is small.
  • the invention according to claim 1 is a three-blade drill having three thinning cutting edges, wherein the rotation center of the cutting edge protrudes toward the tip side, and one or two thinning cutting edges have the rotation center.
  • the other two or one thinning cutting blades do not cover the rotation center, so that the tip of the cutting edge is not a triangular pyramid shape, and the rotation center has a sharp shape. .
  • the invention according to claim 2 is such that the tip angle ⁇ 1 is 45 ° ⁇ ⁇ 1 ⁇ 120 °, the relief angle ⁇ 2 of the thinning cutting edge is 2 ° ⁇ ⁇ 2 ⁇ 20 °, and the thinning cutting edge
  • the rake angle ⁇ 3 is 0 ° ⁇ ⁇ 3 ⁇ 20 °.
  • one or two thinning cutting blades pass through the center of rotation, and there is a cutting blade in the center portion, so the cutting resistance is small. Further, since the other two or one thinning cutting edge does not cover the rotation center, the rotation center has a sharp shape. This makes the blade edge difficult to slip.
  • the tip angle, the relief angle of the thinning cutting edge, and the rake angle are within the predetermined ranges, the cutting edge is more difficult to slip and the cutting resistance is reduced.
  • FIG. 6 is a drawing substitute photograph of a side view seen from the H-1 direction to the H-6 direction of FIG. 5 and a front view of the drawing substitute photograph.
  • (A) is a front view of the front-end
  • (b) is a perspective view of the front-end
  • (A) is a perspective view of the front-end
  • (b) is the partial extraction figure which extracted a part of (a). It is a front view of the tip part of a blade tip which made the distribution angle between the three blades of the thinning blade of the three blade drill concerning the embodiment of the present invention unequal. It is the front view and its side view in the unequal division
  • segmentation of the 3 blade drill which concerns on embodiment of this invention, 13 (b) is the side view seen from the A direction of 13 (a). It is the front view and its side view in equal division of the 3 blade drill which concerns on embodiment of this invention, 14 (b) is the side view seen from A direction of 14 (a).
  • (A) is a front view of the front-end
  • (b) is a front view of the front-end
  • (A) is a drawing substitute photograph of the thermography at the time of cutting with the 3-blade drill of the Example
  • (b) is a drawing substitute photograph of the thermography at the time of cutting with the 3-blade drill of the comparative example.
  • the three-blade drill of the present embodiment is a three-blade drill including three thinning cutting blades, and one or two thinning cutting blades pass through the rotation center of the tip of the cutting edge of the three-blade drill, The other two or one thinning cutting edge does not cover the rotation center.
  • FIGS. 3 (a) and 3 (b) are views of the tip of the three-blade drill according to the present embodiment as viewed from the front, as viewed from the C, D, E, F, and G directions in FIG. 3 (a). Side views are shown in FIGS. 4A, 4B, 4C, 4D, and 4E.
  • 3A shows a drill in which one thinning cutting edge passes through the rotation center
  • FIG. 3B shows a drill in which two thinning cutting edges pass through the rotation center.
  • FIG. 3A shows a drill in which one thinning cutting edge passes through the rotation center
  • FIG. 3B shows a drill in which two thinning cutting edges pass through the rotation center.
  • FIG. 3A shows a drill in which one thinning cutting edge passes through the rotation center
  • FIG. 3B shows a drill in which two thinning cutting edges pass through the rotation center.
  • FIGS. 6 (a) to 6 (f) show a drawing substitute photograph of the side as viewed from the H-1 direction to the H-6 direction in FIG. Show.
  • Thinnings 1a, 1b, and 1c are provided in three directions at equal angles in the circumferential direction from the rotation center C to the outer periphery (see FIG. 3A).
  • the thinnings 1a, 1b, and 1c have thinning cutting edges 11a, 11b, and 11c, respectively. Of these thinning cutting edges 11a, 11b, 11c, the thinning cutting edge 11a passes through the rotation center C.
  • the thinning cutting edge 11a has a mountain shape that is pointed toward the tip at the rotation center C (see FIG. 4A).
  • the thinnings 1a, 1b, and 1c are collectively referred to as “thinning 1”.
  • the thinning cutting edges 11a, 11b, and 11c are collectively referred to as a thinning cutting edge 11.
  • First flank surfaces 2a, 2b, 2c and second flank surfaces 3a, 3b, 3c are formed from the thinning cutting edges 11a, 11b, 11c toward the respective heel sides.
  • the first flank surfaces 2a, 2b, and 2c are collectively referred to as a first flank surface 2, and the second flank surfaces 3a, 3b, and 3c are collectively referred to as a second flank surface 3.
  • a ridge line 5c is formed between the first flank 2a and the first flank 2c.
  • three strip discharge grooves 4a, 4b and 4c are provided on the outer peripheral side.
  • the chip discharge grooves 4a, 4b, and 4c are collectively referred to as a chip discharge groove 4.
  • FIG. 7A shows a perspective view
  • FIG. 7B shows a perspective view. It has ridge lines 5a, 5b and 5c extending radially from the rotation center C in three directions.
  • the ridge lines 5a, 5b, and 5c are collectively referred to as a ridge line 5.
  • the thinning 1a shown in FIG. 3 (a) covers the ridge 5a shown in FIG. 7 (a) and is formed so that the thinning cutting edge 11a passes through the rotation center C.
  • the thinning 1b is formed so as to cover the ridgeline 5b and a part of the thinning 1a and not the rotation center.
  • the thinning 1c is formed so as to cover a part of the ridge 5c and not the rotation center.
  • the thinning 1a shown in FIG. 3B covers the ridge 5a shown in FIG. 7A, and the thinning cutting blade 11a passes through the rotation center C.
  • the thinning 1b is formed so as to cover the ridge 5b and pass through the rotation center C.
  • the thinning 1c is formed so as to cover a part of the ridge 5c and not the rotation center.
  • FIGS. 8 and 9 A perspective view of the tip of the three-blade drill is shown in FIGS. 8 and 9, and a front view is shown in FIG.
  • FIG. 8 is a perspective view seen from the thinning 1a side
  • FIG. 9 is a perspective view seen from the thinning 1b side.
  • the tip angle ⁇ 1 of the three-blade drill is preferably 45 ° ⁇ ⁇ 1 ⁇ 120 °.
  • This tip angle ⁇ 1 is an angle of a cone formed by the rotation of the thinning cutting edges 11a, 11b, and 11c.
  • the thinning cutting edge 11a and the axial direction of the drill when viewed from the arrow X direction Is twice the angle formed by (the direction perpendicular to the page).
  • the clearance angle ⁇ 2 of the thinning cutting edge 11 is preferably 2 ° ⁇ ⁇ 2 ⁇ 20 °.
  • the rake angle ⁇ 3 of the thinning cutting edge 11 is preferably 0 ° ⁇ ⁇ 3 ⁇ 20 °, and more preferably 1 ° ⁇ ⁇ 3 ⁇ 15 °.
  • the shape and dimensions of the thinning 1 are not particularly limited. It is sufficient that a rake angle can be formed and the machinability is not deteriorated by the triangular pyramid ridgeline at the center of the tip.
  • the clearance angle of the second flank 3 is not particularly limited, but is required to be at least larger than the clearance angle of the first flank 2 (the clearance angle of the thinning cutting edge 11). It seems optimal.
  • the flank has a rake shape (planar shape) formed by the first flank 2 and the second flank 3 in the configuration of the present plan
  • the flank angle is set to a predetermined value, and the flank is directed from the thinning cutting edge toward the heel side.
  • it may be a curved surface with a gradually increasing clearance angle.
  • Such flank is often used for general-purpose general-purpose drills.
  • the rotation center C cutting with the thinning cutting edge 11a is started from the point contact state, and after cutting with the thinning cutting edge 11a having a clear rake angle in a state where the center is not shaken, the thinning cutting edge 11b and the thinning cutting edge are obtained. 11c follows and it shifts to the cutting of 3 blades. During this time, the rotation center C side of the thinning cutting edge 11c does not come into contact with the workpiece when the thinning cutting edge 11a is cut, so that the cutting of the thinning cutting edge 11a is not hindered (portion surrounded by a broken line in FIG. 10). In the thinning 1c applied to create the thinning cutting edge 11c, the position where the cutting edge starts to work (the position where the cutting edge has a rake angle) may be set within the broken line portion in FIG.
  • An outer peripheral cutting edge (common to three cutting edges) is created on the outer periphery of the drill by a chip discharge groove 4 (see FIGS. 3, 8, 9 and the like).
  • the thinning cutting edge 11 formed by the thinning 1 extends radially from the center of the drill toward the outer periphery, and a sharp edge is formed by matching the position of the outer periphery reaching point and the outer periphery cutting edge (see FIGS. 8 and 9).
  • the peripheral point of the outer periphery of the drill and the thinning cutting edge 11 is literally a point, and the rake angle of the outer peripheral cutting edge is a rake angle created by twisting of the chip discharge groove, and coincides with the twisting angle.
  • the rake angle of the outer peripheral cutting edge is increased to increase the cutting force, the rake angle of the outer peripheral cutting edge> the rake angle of the thinning cutting edge 11 ⁇ 0 °, and the rake angle of the thinning cutting edge 11 is as described above. 0 to 20 °.
  • the rake angle of the outer peripheral cutting edge is large, the possibility of cracking or chipping in the object to be drilled increases, which may lead to damage to bone tissue.
  • the rake angle of the thinning cutting edge 11 can be directly set to the rake angle of the outer peripheral cutting edge without matching the outer peripheral reaching point of the thinning cutting edge 11 with the outer peripheral cutting edge. (Shown in FIG. 11)
  • the rake angles of the thinning cutting edges 11a, 11b, and 11c are preferably the same in consideration of the balance of cutting. However, since the cutting edge length is different for all three cutting edges, different angles may be set for each.
  • the cutting edge 11a ⁇ the thinning cutting edge 11b the thinning cutting edge 11c and the like, and two blades may be common and one blade may be at a different angle.
  • the distribution angle between the three blades may be equally divided or unequal.
  • FIGS. 12 and 13 show an example in which two thinning cutting edges pass through the center of rotation, but when the distribution angle is unequal, a long blade with a long straight portion and a short blade with a short straight portion are short. With blades 1 and 2, the split angle from the long blade to the short blades 1 and 2 can be set to 90 ° to 140 °. The same is true when one thinning cutting edge passes through the center of rotation.
  • FIG. 14 shows a case where two thinning cutting edges are equally divided through the rotation center
  • FIG. 15 shows a case where one thinning cutting edge is non-uniformly divided through the rotation center.
  • the three-blade drill has the above-described configuration, the following effects can be obtained.
  • One of the three thinnings 1a is scraped off from the rotation center C to the first flank 2b, or two of the three thinnings 1a and 1b
  • the adverse effects of the triangular pyramid shape of the conventional three-edged drill can be solved.
  • a clear rake angle is formed on the thinning cutting edge 11a from the rotation center C to the outer periphery.
  • a clear center point is formed at the rotation center C, there is no possibility that the center portion is shifted during rotation. 4).
  • the strength of the rotation center C can ensure sufficient strength by adjusting the shape of the thinning 1c.
  • Dividing the distribution angle of the three thinning cutting blades evenly produces an effect of suppressing chattering phenomenon that occurs during cutting, and is effective when the drilling target is hard or when the structure is not constant. be able to.
  • the distribution angle of the three thinning cutting blades is unequally divided, the strength near the rotation center can be increased, and a hard object can be used in a wide range according to the drilling target.
  • the three-blade drill of the present embodiment greatly improves the cutting ability at the center of the tip, which was a weak point of the conventional three-blade drill, and is a feature of the three-blade at the time of cutting. It becomes a high-performance drill with excellent performance.
  • the tip angle ⁇ 1 may be changed depending on the material to be drilled within the above-mentioned range.
  • a medical drill such as a resin or an orthopedic drill
  • a material having high hardness such as high speed steel or cemented carbide is preferable.
  • materials determined for medical use such as stainless steel and titanium alloy are preferable.
  • not only drilling in the vertical direction but also cutting in oblique and strong oblique positions is necessary.
  • the tip center part makes point contact at the time of initial contact, so there is little possibility of slipping.
  • there is a cutting edge having a rake angle at the center and drilling is started simultaneously with the contact, so that the human bone can be drilled smoothly.
  • FIG. 16A is a front view of the tip end of the three-edged drill of the example
  • FIG. 16B is a front view of the tip end of the three-edged drill of the comparative example.
  • the three-blade drill of the comparative example is the conventional three-blade drill shown in FIG.
  • Both the three-flute drills of the example and the comparative example have the following specifications. 1. Drill diameter: 3.2mm 2. Twist angle: 30 ° 3. First flank clearance angle ⁇ 2 : 8 ° 4).
  • Second flank clearance angle 30 ° 5).
  • Rake angle ⁇ 3 15 ° (the actual length is 1.05 mm at the cutting edge part from the outer periphery to ⁇ 1.1 mm) 6).
  • Tip angle ⁇ 1 100 ° 7).
  • Total length 110mm 8).
  • Groove length 45mm 9.
  • the dimensions relating to the cutting edge at the tip of the three-blade drill of the comparative example are as follows (see FIG. 16B) ) 1. Rake angle of 15 ° or less (diameter): ⁇ 1.1mm 2. Range (diameter) where rake angle disappears: ⁇ 0.5mm 3. Range (diameter) where the ridgeline of the triangular pyramid remains: ⁇ 0.26mm
  • Test method Using the two types of drills of Examples and Comparative Examples, bovine femurs were drilled and cut, and resistance and temperature rise during cutting were measured using a cutting resistance meter and thermography. Test conditions are shown below. 1. Equipment used: NC milling machine manufactured by Otori Kiko2. Rotation speed: 800 RPM 3. Feeding speed: 30 mm / min. 4). Depth of cut: 7mm from bone surface 5). Room temperature: 19 ° C 6). Bone surface temperature: 15.3 ° C
  • FIG. 18 shows a drawing substitute photograph of thermography at the time of cutting.
  • the temperature rise during cutting was 25.5 ° C. and a maximum of 40.8 ° C.
  • the temperature increase was 59.1 ° C. and a maximum of 74.4 ° C.
  • the smoke generation could not be confirmed in the three-blade drill of the example by visual observation at the time of cutting, the smoke generation could be confirmed in the comparative example.
  • the three-blade drill of the present invention showed results that were significantly better than the conventional three-blade drill.
  • the present invention is suitably used for a medical drill, for example.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)

Abstract

Le problème selon l'invention consiste à fournir un foret à trois lames présentant des bords de coupe qui ne glissent pas facilement et qui présentent une faible résistance à la coupe. La solution selon l'invention porte sur un foret à trois lames présentant trois bords de coupe d'amincissement, le foret à trois lames étant caractérisé en ce qu'un ou deux des bords de coupe d'amincissement passe(nt) à travers un centre de rotation C de la pointe des bords de coupe du foret à trois lames, et le(s) bord(s) de coupe d'amincissement restant(s) ne recouvre(nt) pas le centre de rotation C.
PCT/JP2016/075086 2015-08-27 2016-08-26 Foret à trois lames Ceased WO2017034032A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016572849A JP6235737B2 (ja) 2015-08-27 2016-08-26 ３枚刃ドリル

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JP2015168347 2015-08-27
JP2015-168347 2015-08-27

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WO2017034032A1 true WO2017034032A1 (fr) 2017-03-02

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PCT/JP2016/075086 Ceased WO2017034032A1 (fr) 2015-08-27 2016-08-26 Foret à trois lames

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WO (1) WO2017034032A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022142055A (ja) * 2021-03-16 2022-09-30 ダイジ▲ェ▼ット工業株式会社 ドリル
WO2023016865A1 (fr) * 2021-08-13 2023-02-16 Gühring KG Outil combiné
JP7422442B1 (ja) 2023-06-23 2024-01-26 株式会社メドメタレックス ドリル

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
KR102316725B1 (ko) * 2020-05-20 2021-10-25 주식회사 와이지-원 다결정다이아몬드 소재의 절삭날이 결합된 엔드밀
KR102638264B1 (ko) 2021-01-07 2024-02-20 주식회사 비앤메디 오스테오톰
KR20250153445A (ko) * 2024-04-18 2025-10-27 오스템임플란트 주식회사 치과용 드릴 및 이를 포함하는 치과용 드릴 세트

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JP2003505259A (ja) * 1999-07-14 2003-02-12 セコ ツールズ アクティエボラーグ（プブル） ３枚の切れ刃を有するドリルユニット
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WO2009135681A1 (fr) * 2008-05-08 2009-11-12 Drebo Werkzeugfabrik Gmbh Foret
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JP2014522735A (ja) * 2011-07-06 2014-09-08 サンドビック インテレクチュアル プロパティー アクティエボラーグ ツイストドリル、複合材料孔明け方法、ツイストドリルの使用および再研削方法および製造方法
WO2015028431A1 (fr) * 2013-08-30 2015-03-05 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Foret

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JPS6078213U (ja) * 1983-11-02 1985-05-31 泉自動車工業株式会社 付刃ドリル
JP2003505259A (ja) * 1999-07-14 2003-02-12 セコ ツールズ アクティエボラーグ（プブル） ３枚の切れ刃を有するドリルユニット
JP2006000985A (ja) * 2004-06-18 2006-01-05 Nisshin Kogu Kk 切削工具
WO2009135681A1 (fr) * 2008-05-08 2009-11-12 Drebo Werkzeugfabrik Gmbh Foret
JP2013525129A (ja) * 2010-04-27 2013-06-20 サンドビック インテレクチュアル プロパティー アクティエボラーグ 先端材料用のツイストドリル
JP2014522735A (ja) * 2011-07-06 2014-09-08 サンドビック インテレクチュアル プロパティー アクティエボラーグ ツイストドリル、複合材料孔明け方法、ツイストドリルの使用および再研削方法および製造方法
WO2015028431A1 (fr) * 2013-08-30 2015-03-05 MAPAL Fabrik für Präzisionswerkzeuge Dr. Kress KG Foret

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022142055A (ja) * 2021-03-16 2022-09-30 ダイジ▲ェ▼ット工業株式会社 ドリル
WO2023016865A1 (fr) * 2021-08-13 2023-02-16 Gühring KG Outil combiné
JP7422442B1 (ja) 2023-06-23 2024-01-26 株式会社メドメタレックス ドリル
JP2025002696A (ja) * 2023-06-23 2025-01-09 株式会社メドメタレックス ドリル

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