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JP2005319538A - Ball endmill - Google Patents

Ball endmill Download PDF

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Publication number
JP2005319538A
JP2005319538A JP2004139519A JP2004139519A JP2005319538A JP 2005319538 A JP2005319538 A JP 2005319538A JP 2004139519 A JP2004139519 A JP 2004139519A JP 2004139519 A JP2004139519 A JP 2004139519A JP 2005319538 A JP2005319538 A JP 2005319538A
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Prior art keywords
cutting
outer peripheral
blade
end mill
ball
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JP2004139519A
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Japanese (ja)
Inventor
Mitsuyoshi Obata
光由 小幡
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Nachi Fujikoshi Corp
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Nachi Fujikoshi Corp
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Priority to JP2004139519A priority Critical patent/JP2005319538A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a ball endmill which can reduce a cutting resistance in cutting a rising wall surface having a tilting angle, and can lengthen the tool life, and can improve the machining accuracy. <P>SOLUTION: The ball endmill having two to ten outer helical cutting edges continued from the R edge 12 of the tip end ball surface has a back taper on the outer peripheral cutting edge 2, 5 of the outer peripheral cutting edge portion 1, 4 so as to reduce the cutting resistance when the rising wall surface having the tilting angle is cut by means of the ball endmill. Preferably, the back taper angle is 0.5° to 5°. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、金型加工などに使用される、先端ボール面のＲ刃につづく外周ねじれ刃を２〜１０枚有するボールエンドミルにの改良に関する。   The present invention relates to an improvement to a ball end mill having 2 to 10 outer peripheral torsional blades that follow an R blade on a tip ball surface, which is used for die processing and the like.

従来の金型加工などに使用される、先端ボール面のＲ刃につづく外周ねじれ刃を２〜１０枚有するボールエンドミルは、例えば特許文献１に開示する図６に示すように、外周刃の概略側面図でみて、外周刃長部11の外周刃13は立ち壁や深溝の直角度精度、再研削を考慮し、ストレートになっており、バックテーパはゼロにされている。
特開平６−２１８６１３号公報 As shown in FIG. 6 disclosed in Patent Document 1, for example, a ball end mill having 2 to 10 outer peripheral torsional blades following an R blade on the tip ball surface used for conventional mold processing is an outline of the outer peripheral blades. As seen from the side view, the outer peripheral blade 13 of the outer peripheral blade length portion 11 is straight in consideration of the perpendicularity accuracy of the standing wall and deep groove and regrinding, and the back taper is zero.
JP-A-6-218613

かかる従来のボールエンドミルは、加工のほとんどが先端ボール面のＲ刃12での加工であるが、立ち壁や深溝の加工には、外周刃長部11は外周刃13も切削に関与する。しかし、従来のボールエンドミルは、その外周刃長部はバックテーパはゼロにされているので、傾斜角を有する立ち壁面を切削するときは、その切削形態説明図である図２（ｂ）に示すように、切削に関与する切れ刃の接触長さL2が長くなり、工具が受ける抵抗が大きくなり工具がたわみ、加工精度が狙いからずれてしまう。又、切削抵抗の増大は切削工具の寿命低下にもつながり、抵抗の増大から切削振動が発生し突発的な折損を招くこともあった。   In such a conventional ball end mill, most of the processing is performed with the R blade 12 on the tip ball surface, but the outer peripheral blade length 11 and the outer peripheral blade 13 are also involved in the cutting of the standing wall and deep groove. However, in the conventional ball end mill, since the back edge taper of the outer peripheral blade length is zero, when cutting a standing wall surface having an inclination angle, it is shown in FIG. As described above, the contact length L2 of the cutting edge involved in the cutting becomes longer, the resistance that the tool receives increases, the tool is deflected, and the processing accuracy deviates from the target. In addition, an increase in cutting resistance leads to a reduction in the life of the cutting tool, and cutting vibration may occur due to the increase in resistance, leading to sudden breakage.

本発明の課題は、かかる従来技術の課題を解決した、傾斜角を有する立ち壁面を切削するときに、切削抵抗を軽減でき、工具寿命の増大、加工精度を向上ささせたボールエンドミルを提供することにある。   An object of the present invention is to provide a ball end mill that solves the problems of the prior art and that can reduce cutting resistance, increase tool life, and improve machining accuracy when cutting a standing wall surface having an inclination angle. There is.

このため本発明によると、先端ボール面のＲ刃につづく外周ねじれ刃を２〜１０枚有するボールエンドミルにおいて、外周刃長部の外周刃にバックテーパを設けたことを特徴とするボールエンドミルによって上述の本発明の課題を解決した。   Therefore, according to the present invention, in the ball end mill having 2 to 10 outer peripheral torsional blades following the R blade on the tip ball surface, the back end taper is provided on the outer peripheral blade of the outer peripheral blade long portion. The problems of the present invention were solved.

本発明では、先端ボール面のＲ刃につづく外周刃長部の外周刃にバックテーパを設けたので、傾斜角を有する立ち壁面を切削するときに、従来品に比べ、切削に関与する外周刃長部の外周刃の切れ刃長さが短くなるため、切削抵抗が軽減でき、これにより工具寿命の増大、加工精度を向上ささせたボールエンドミルを提供するものとなった。   In the present invention, since the back taper is provided on the outer peripheral blade of the outer peripheral blade length portion following the R blade on the tip ball surface, the outer peripheral blade involved in cutting compared to the conventional product when cutting a standing wall surface having an inclination angle. Since the cutting edge length of the outer peripheral edge of the long part is shortened, the cutting resistance can be reduced, thereby providing a ball end mill with an increased tool life and improved machining accuracy.

本発明を実施するための最良の形態につき、図１を参照して説明する。図１は本発明を実施するための最良の形態の、先端ボール面のＲ刃12につづく外周ねじれ刃を２〜１０枚有するボールエンドミルの概略側面図をそれぞれ示し、（ａ）はストレートシャンクボールエンドミルで、先端ボール面のＲ刃12につづく外周刃長部１の外周刃２にバックテーパが設けられている。（ｂ）はロングネックストレートシャンクボールエンドミルで、先端ボール面のＲ刃12につづく外周刃長部４の外周刃５にバックテーパが設けられている。３はストレートシャンク、６はロングネックである。   The best mode for carrying out the present invention will be described with reference to FIG. FIG. 1 is a schematic side view of ball end mills each having 2 to 10 peripheral torsional blades following the R-blade 12 on the tip ball surface in the best mode for carrying out the present invention. In the end mill, a back taper is provided on the outer peripheral blade 2 of the outer peripheral blade length 1 following the R blade 12 on the tip ball surface. (B) is a long neck straight shank ball end mill, and a back taper is provided on the outer peripheral blade 5 of the outer peripheral blade long portion 4 following the R blade 12 on the tip ball surface. 3 is a straight shank and 6 is a long neck.

図２（ａ）は図１（ａ）に示す本発明の最良の実施形態のストレートシャンクボールエンドミルで、傾斜角を有する立ち壁面を切削するときの切削形態説明図で、切削に関与する切れ刃の接触長さL1が（ｂ）に示す従来品の切削に関与する切れ刃の接触長さL2より短くなっており、工具が受ける抵抗が従来品のそれに比べて小さくなり、工具のたわみが小さくなり、加工精度が狙いからずれることがなく、切削振動の発生が少なくなり、突発的な折損が少なくなり、切削工具の寿命が長くなる。   FIG. 2 (a) is an explanatory view of a cutting form when cutting a standing wall surface having an inclination angle in the straight shank ball end mill of the best embodiment of the present invention shown in FIG. 1 (a). The contact length L1 of the tool is shorter than the contact length L2 of the cutting edge involved in the cutting of the conventional product shown in (b), the resistance that the tool receives is smaller than that of the conventional product, and the tool deflection is small Therefore, the machining accuracy is not missed, the occurrence of cutting vibration is reduced, sudden breakage is reduced, and the life of the cutting tool is extended.

図３に本発明の実施形態の外径Ｄ＝φ１mm、Ｒ０．５mm、首下長さ（刃部及びネック部の長さ）が10mmのロングネックボールエンドミルの側面図を示す。先端ボール面のＲ刃12につづく外周刃長部４の外周刃５に２°のバックテーパを施した。図３に示すように、本発明のロングネックボールエンドミルと、従来形状品の外径Ｄ＝φ１mm、Ｒ０．５mm、首下長さ（刃部及びネック部の長さ）が10mmのロングネックボールエンドミルとが、傾斜角85°の立ち壁を等高線ドライ加工による切削抵抗比較テストを行った。切削条件は、図４に示すように、被削材プレハードン鋼 NAK80(40 HRC)を切削速度50m/min （回転数15,900min -1）、テーブル送り速度 400mm/min(f＝0.0126mm/t) 、切り込みａａ＝0.1 mm、ピックフィードＰｆ＝0.1 mmにて傾斜角85°の立ち壁を等高線ドライ加工した。切削抵抗比較テストの結果の本発明品と従来形状品のそれぞれの切削抵抗を図５に示す。本発明品の切削抵抗は約55Ｎで安定しているのに対し、従来形状品の抵抗は切削振動が発生しており、不安定な状態になっていることが分かる。
〔本発明の最良の実施形態の効果〕 FIG. 3 is a side view of a long neck ball end mill having an outer diameter D = φ1 mm, R0.5 mm, and a neck length (blade portion and neck portion length) of 10 mm according to an embodiment of the present invention. A back taper of 2 ° was applied to the outer peripheral blade 5 of the outer peripheral blade long portion 4 following the R blade 12 on the tip ball surface. As shown in FIG. 3, the long neck ball end mill of the present invention and a long neck ball having an outer diameter D = φ1 mm, R 0.5 mm, and a neck length (blade portion and neck portion length) of 10 mm. An end mill and a cutting resistance comparison test were performed on a standing wall with an inclination angle of 85 ° by dry contour processing. As shown in Fig. 4, the cutting conditions are as follows: Workpiece material pre-hardened steel NAK80 (40 HRC), cutting speed 50m / min (rotation speed 15,900min- 1 ), table feed speed 400mm / min (f = 0.0126mm / t) A standing wall with an inclination angle of 85 ° was subjected to contour dry processing with a cut aa = 0.1 mm and a pick feed Pf = 0.1 mm. FIG. 5 shows the cutting resistances of the product of the present invention and the conventional shape as a result of the cutting resistance comparison test. It can be seen that the cutting resistance of the product of the present invention is stable at about 55 N, while the resistance of the conventional shape product is in an unstable state due to the occurrence of cutting vibration.
[Effect of Best Embodiment of the Present Invention]

本発明の最良の実施形態では、先端ボール面のＲ刃につづく外周刃長部の外周刃にバックテーパを設けたので、傾斜角を有する立ち壁面を切削するときに、従来品に比べ、切削に関与する外周刃長部の外周刃の切れ刃長さが短くなるため、切削抵抗が軽減でき、これにより工具寿命の増大、加工精度を向上ささせたボールエンドミルを提供するものとなった。
好ましくは、バックテーパは 0.5°〜５°にされている。バックテーパは 0.5°以上ないと効果がなく、５°以上のバックテーパでは外周刃長部の外周刃の剛性が無くなるため、バックテーパは 0.5°〜５°に設定した。 In the best embodiment of the present invention, since the back taper is provided on the outer peripheral blade of the outer peripheral blade length portion following the R blade of the tip ball surface, when cutting a standing wall surface having an inclination angle, cutting is performed compared to the conventional product. Since the cutting edge length of the outer peripheral edge part of the outer peripheral edge part involved in the cutting becomes shorter, the cutting resistance can be reduced, thereby providing a ball end mill with an increased tool life and improved processing accuracy.
Preferably, the back taper is set to 0.5 ° to 5 °. If the back taper is 0.5 ° or more, there is no effect, and if the back taper is 5 ° or more, the rigidity of the outer peripheral blade of the outer peripheral blade length is lost, so the back taper is set to 0.5 ° to 5 °.

本発明を実施するための最良の形態の先端ボール面のＲ刃につづく外周ねじれ刃を２〜１０枚有する（ａ）はストレートシャンクボールエンドミル、（ｂ）はロングネックストレートシャンクボールエンドミルの概略側面図をそれぞれ示す。2 to 10 of outer peripheral torsional blades following the R blade of the tip ball surface of the best mode for carrying out the present invention, (a) is a straight shank ball end mill, and (b) is a schematic side view of a long neck straight shank ball end mill. Each figure is shown. （ａ）は図１（ａ）に示す本発明の最良の実施形態のストレートシャンクボールエンドミルで傾斜角を有する立ち壁面を切削するときの切削形態説明図、（ｂ）は従来品の同様な傾斜角を有する立ち壁面を切削するときの切削形態説明図をそれぞれ示す。(A) is an explanatory view of a cutting form when cutting a standing wall surface having an inclination angle with the straight shank ball end mill of the best embodiment of the present invention shown in FIG. 1 (a), and (b) is a similar inclination of a conventional product. Cutting form explanatory drawing when cutting the standing wall surface which has a corner is shown, respectively. 本発明の実施形態の外径Ｄ＝φ１mm、Ｒ０．５mm、首下長さ（刃部及びネック部の長さ）が10mmのロングネックボールエンドミルの側面図を示す。A side view of a long neck ball end mill with an outer diameter D = φ1 mm, R0.5 mm, and a neck length (blade portion and neck portion length) of 10 mm according to an embodiment of the present invention is shown. 本発明のロングネックボールエンドミルと従来形状品のロングネックボールエンドミルとによるテスト加工を行う、傾斜角85°の加工ワークの斜視図。The perspective view of the workpiece | work of the inclination angle of 85 degrees which performs test processing by the long neck ball end mill of this invention, and the long neck ball end mill of the conventional shape product. 図４に示す切削抵抗比較テストの結果の本発明品と従来形状品のそれぞれの切削抵抗を示す。The cutting resistance of each of the product of the present invention and the product of the conventional shape as a result of the cutting resistance comparison test shown in FIG. 4 is shown. 従来のボールエンドミルの外周刃長部の外周刃の概略側面図である。It is a schematic side view of the outer peripheral blade of the outer peripheral blade length part of the conventional ball end mill.

符号の説明Explanation of symbols

１、４：外周刃長部 ２、５：外周刃
３：ストレートシャンク １２：先端ボール面のＲ刃 1, 4: Peripheral blade length part 2, 5: Peripheral blade 3: Straight shank 12: R blade on tip ball surface

Claims (2)

外周ねじれ刃を２〜１０枚有するボールエンドミルにおいて、先端ボール面のＲ刃につづく外周刃長部の外周刃にバックテーパを設けたことを特徴とするボールエンドミル。   A ball end mill having 2 to 10 outer peripheral twisting blades, wherein a back taper is provided on the outer peripheral blade of the outer peripheral blade length portion following the R blade on the tip ball surface. 前記バックテーパは 0.5°〜５°としたことを特徴とする請求項１記載のボールエンドミル。
The ball end mill according to claim 1, wherein the back taper is 0.5 ° to 5 °.
JP2004139519A 2004-05-10 2004-05-10 Ball endmill Pending JP2005319538A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011147983A (en) * 2010-01-22 2011-08-04 Toyo Seikan Kaisha Ltd Forming tool and method for machining the same
US8186914B2 (en) 2007-04-23 2012-05-29 Union Tool Co. Rotary cutting tool
US20140294527A1 (en) * 2013-03-26 2014-10-02 Kennametal Inc. Tool head and method for machining a metallic workpiece
CN108380952A (en) * 2018-04-26 2018-08-10 成都飞机工业（集团）有限责任公司 A kind of ball end mill of narrow space corner and base angle processing
JP6892037B1 (en) * 2020-09-24 2021-06-18 株式会社Ｍｏｌｄｉｎｏ End mill

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06218613A (en) * 1992-09-30 1994-08-09 Sandvik Ab Solid ball nose tool
JPH0871824A (en) * 1994-09-12 1996-03-19 O S G Kk Composite material machining drill
JPH09131610A (en) * 1995-11-06 1997-05-20 Okuma Mach Works Ltd Thin thickness rib machining method
JPH1128609A (en) * 1997-07-04 1999-02-02 Nok Corp Core drill
JPH11254222A (en) * 1998-03-11 1999-09-21 Makino Milling Mach Co Ltd Cutting tool
JP2002292515A (en) * 2001-03-29 2002-10-08 Hitachi Tool Engineering Ltd End mill for cutting contour line
JP2004223633A (en) * 2003-01-21 2004-08-12 Hitachi Tool Engineering Ltd Small diameter ball end mill

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06218613A (en) * 1992-09-30 1994-08-09 Sandvik Ab Solid ball nose tool
JPH0871824A (en) * 1994-09-12 1996-03-19 O S G Kk Composite material machining drill
JPH09131610A (en) * 1995-11-06 1997-05-20 Okuma Mach Works Ltd Thin thickness rib machining method
JPH1128609A (en) * 1997-07-04 1999-02-02 Nok Corp Core drill
JPH11254222A (en) * 1998-03-11 1999-09-21 Makino Milling Mach Co Ltd Cutting tool
JP2002292515A (en) * 2001-03-29 2002-10-08 Hitachi Tool Engineering Ltd End mill for cutting contour line
JP2004223633A (en) * 2003-01-21 2004-08-12 Hitachi Tool Engineering Ltd Small diameter ball end mill

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8186914B2 (en) 2007-04-23 2012-05-29 Union Tool Co. Rotary cutting tool
JP2011147983A (en) * 2010-01-22 2011-08-04 Toyo Seikan Kaisha Ltd Forming tool and method for machining the same
US20140294527A1 (en) * 2013-03-26 2014-10-02 Kennametal Inc. Tool head and method for machining a metallic workpiece
US9415450B2 (en) * 2013-03-26 2016-08-16 Kennametal Inc. Tool head and method for machining a metallic workpiece
CN108380952A (en) * 2018-04-26 2018-08-10 成都飞机工业（集团）有限责任公司 A kind of ball end mill of narrow space corner and base angle processing
JP6892037B1 (en) * 2020-09-24 2021-06-18 株式会社Ｍｏｌｄｉｎｏ End mill
WO2022064595A1 (en) * 2020-09-24 2022-03-31 株式会社Moldino End mill

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