JP5346827B2 - End mill - Google Patents

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JP5346827B2
JP5346827B2 JP2010020519A JP2010020519A JP5346827B2 JP 5346827 B2 JP5346827 B2 JP 5346827B2 JP 2010020519 A JP2010020519 A JP 2010020519A JP 2010020519 A JP2010020519 A JP 2010020519A JP 5346827 B2 JP5346827 B2 JP 5346827B2
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道孝 霜手
信行 木場
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株式会社大光研磨
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an end mill reducing the total time of cutting by performing roughing cut and finishing cut simultaneously. <P>SOLUTION: The end mill 10 includes: a cutting blade portion 13 provided with a bottom blade 11 for planar cutting on the bottom, and a plurality of outer circumferential blades 12 helically arranged on the outer circumferential portion; and a shank portion 14 coaxially connected to the cutting blade portion 13 in a body. Each of outer circumferential blades 12 has a rough cutting blade 15 and a finishing blade 16 arranged on the rear side of the rough cutting blade 15 in the rotation direction. The blade group edge radius of the finishing blades 16 is larger than the blade group edge radius of the rough cutting blades 15 by 1/100 or less of the blade group edge radius of the rough cutting blades 15 in a range. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、切り刃部の外周部に螺旋状の外周刃を備え、軸心回りに回転して切削加工するエンドミルに関する。 The present invention relates to an end mill that is provided with a spiral outer peripheral blade on the outer peripheral portion of a cutting blade portion and rotates around an axis to perform cutting.

従来、切削加工に使用されるエンドミルには、粗削りを行う粗加工用のものや、仕上げ加工用のものがあり、粗加工用のエンドミルを用いた後に、仕上げ加工用のエンドミルを用いて切削加工が行われている。
粗加工用のエンドミル及び仕上げ加工用のエンドミルは、略円柱状の切り刃部の外周部に螺旋状に配置された外周刃を備える点で共通し、外周刃の形状が相違する。
仕上げ加工用のエンドミルの外周刃は、例えば特許文献１に記載されているように、エンドミル本体の軸心から刃先までの距離（刃先半径）、及びエンドミル本体の軸方向に対する捩れ角度が一定に形成されている。
これに対し、粗加工用のエンドミルの外周刃は、刃先半径や捩れ角度が一定でなく、例えば特許文献２で開示されているように、山部と谷部が交互に配置された波形状等に形成される。 Conventionally, end mills used for cutting include roughing for roughing and finishing, and after using the end mill for roughing, the end mill for finishing is used for cutting. Has been done.
The end mill for roughing and the end mill for finishing are common in that they have outer peripheral blades arranged spirally on the outer peripheral portion of the substantially cylindrical cutting blade portion, and the shapes of the outer peripheral blades are different.
For example, as described in Patent Document 1, the outer peripheral edge of the end mill for finishing is formed with a constant distance from the axis of the end mill body to the blade edge (blade edge radius) and a twist angle with respect to the axial direction of the end mill body. Has been.
On the other hand, the outer peripheral edge of the roughing end mill has a constant cutting edge radius and twist angle. For example, as disclosed in Patent Document 2, a corrugated shape in which peaks and valleys are alternately arranged, etc. Formed.

特開２００９−２２６５０９号公報JP 2009-226509 A 特開２００５−２３０９７６号公報JP 2005-230976 A

しかしながら、粗加工用のエンドミル及び仕上げ加工用のエンドミルをそれぞれ用いて、粗加工及び仕上げ加工の２工程を設けた場合、切削加工全体に要する時間が長くなるとの課題があった。更に、切削加工を行うに際して少なくとも２種類のエンドミルを用意する必要があった。
本発明は、かかる事情に鑑みてなされるもので、粗加工及び仕上げ加工を同時に行い、切削加工全体の時間を短縮するエンドミルを提供することを目的とする。 However, when two steps of roughing and finishing are provided using an end mill for roughing and an end mill for finishing, respectively, there is a problem that the time required for the entire cutting becomes long. Furthermore, it is necessary to prepare at least two types of end mills when performing the cutting process.
This invention is made | formed in view of this situation, and it aims at providing the end mill which performs roughing and finishing simultaneously, and shortens the time of the whole cutting.

前記目的に沿う本発明に係るエンドミルは、底部に平面切削用の底刃を、外周部に螺旋状に配置された複数の外周刃を備えた切り刃部と、該切り刃部に軸心を合わせて一体的に連結するシャンク部とを有するエンドミルにおいて、
前記各外周刃は、粗削り刃と、該粗削り刃の回転方向後方側に配置された仕上げ刃とを有し、しかも、前記仕上げ刃の刃先半径が、前記粗削り刃の刃先半径に比べて、該粗削り刃の刃先半径の１／１００以下の範囲で大きくなって、
前記仕上げ刃は、回転方向前後に隣り合う前記粗削り刃の中間位置より前方側に配置され、前記切り刃部の軸心方向に対する前記仕上げ刃の捩れ角度は、角度θで一定であり、前記切り刃部の軸心方向に対する前記粗削り刃の捩れ角度は、前記角度θの６５〜１３５％の範囲で規則的に増減し、かつ該規則的な増減の周期は、該切り刃部の軸心回りの全周３６０°に対して２５〜５０°の範囲にあることを特徴とする。 An end mill according to the present invention that meets the above-described object is provided with a cutting edge having a bottom cutting edge for flat cutting and a plurality of outer peripheral cutting edges spirally arranged on the outer periphery, and an axial center on the cutting edge. In an end mill having a shank part integrally connected together,
Each of the outer peripheral blades has a rough cutting blade and a finishing blade disposed on the rear side in the rotation direction of the rough cutting blade, and the cutting edge radius of the finishing blade is greater than the cutting edge radius of the rough cutting blade. It becomes larger in the range of 1/100 or less of the cutting edge radius of the roughing blade ,
The finishing blade is disposed in front of an intermediate position between the roughing blades adjacent to each other in the rotational direction, and the twist angle of the finishing blade with respect to the axial direction of the cutting blade portion is constant at an angle θ. The twist angle of the rough cutting blade with respect to the axial direction of the blade portion regularly increases and decreases within a range of 65 to 135% of the angle θ, and the periodic increase and decrease cycle is around the axis of the cutting blade portion. wherein the range near Rukoto of 25 to 50 ° with respect to the entire circumference 360 ° a.

本発明に係るエンドミルにおいて、前記底刃は、前記粗削り刃及び前記仕上げ刃にそれぞれ連続して形成された第１、第２の底面刃を有するのが好ましい。 The end mill which concerns on this invention WHEREIN: It is preferable that the said bottom blade has the 1st, 2nd bottom face blade respectively formed continuously by the said rough cutting blade and the said finishing blade.

請求項１、２記載のエンドミルは、外周刃が、粗削り刃と仕上げ刃を有しているので、一種類のエンドミルを使用して、粗加工及び仕上げ加工を同時に行うことができ、切削加工全体に要する時間を短縮可能である。
また、仕上げ刃の刃先半径が、粗削り刃の刃先半径に比べて、粗削り刃の刃先半径の１／１００以下の範囲で大きくなっているので、粗削り刃で削り取った被削材を仕上げ刃によって切削して、切削面を滑らかに加工することが可能である。 In the end mills according to claims 1 and 2 , since the outer peripheral edge has a rough cutting edge and a finishing edge, it is possible to simultaneously perform roughing and finishing using one kind of end mill, and the entire cutting process Can be shortened.
In addition, the cutting edge radius of the finishing blade is larger than the cutting edge radius of the roughing blade in the range of 1/100 or less of the cutting edge radius of the roughing blade, so that the work material scraped with the roughing blade is cut by the finishing blade. Thus, the cutting surface can be processed smoothly.

特に、仕上げ刃が、回転方向前後に隣り合う粗削り刃の中間位置より前方側に配置されているので、仕上げ刃より刃先半径の短い粗削り刃によって被削材を削り取り可能な切削条件、即ち、エンドミルの回転数及び被削材に対する送り速度の条件の幅を広く設けることができる。 In particular, specifications raised blade, since they are arranged from the front side intermediate position roughing blade adjacent in the longitudinal direction of rotation, it can cutting conditions scraped workpiece by a short rough edge than finishing edges of edge radius, i.e., A wide range of conditions of the rotational speed of the end mill and the feed rate for the work material can be provided.

また、切り刃部の軸心方向に対する粗削り刃の捩れ角度が増減を繰り返すので、切削抵抗が場所によって異なり、被削材を深く削り取ることが可能である。 Further, since the twist angle of the rough cutting blade with respect to the axial direction of the cutting blade portion repeatedly increases and decreases, the cutting resistance varies depending on the location, and the work material can be deeply cut off.

このエンドミルは、粗削り刃の捩れ角度が、規則的に増減しているので、刃の異なる場所での切削深さの均一化が図れ、安定した深さの切削加工が可能である。
また、粗削り刃の捩れ角度の増減は、仕上げ刃に対する相違が３５％以内に限定されるので、粗削り刃と仕上げ刃の回転方向の間隔は、場所によって大きく異ならず、仕上げ刃の切削深さの均一化によって、仕上げ刃の特定箇所に大きな切削抵抗が生じるのを回避可能である。 In this end mill, the torsion angle of the rough cutting blade is regularly increased and decreased, so that the cutting depth can be made uniform at different locations of the blade and stable cutting can be performed.
In addition, since the difference in the twist angle of the roughing blade is limited to 35% or less with respect to the finishing blade, the interval in the rotational direction of the roughing blade and the finishing blade does not vary greatly depending on the location, and the cutting depth of the finishing blade By making uniform, it is possible to avoid the occurrence of a large cutting resistance at a specific portion of the finishing blade.

請求項２記載のエンドミルは、底刃が、２種類の底面刃を有するので、安定的に平面切削が可能である。 In the end mill according to claim 2 , since the bottom blade has two kinds of bottom blades, the surface cutting can be stably performed.

本発明の一実施の形態に係るエンドミルの側面図である。It is a side view of the end mill which concerns on one embodiment of this invention. 同エンドミルの粗削り刃及び仕上げ刃を含む一部拡大断面図である。It is a partially expanded sectional view containing the rough cutting blade and finishing blade of the end mill. 同エンドミルの外周刃の配置を示す展開図である。It is an expanded view which shows arrangement | positioning of the outer periphery blade of the end mill. 同エンドミルの底面図である。It is a bottom view of the end mill.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
図１〜図４に示すように、本発明の一実施の形態に係るエンドミル１０は、底部に平面切削用の底刃１１を、外周部に螺旋状に配置された複数の外周刃１２を備えた切り刃部１３と、切り刃部１３に軸心を合わせて一体的に連結するシャンク部１４とを有し、チタン合金等の被削材を切削するシャンクタイプのフライスである。
そして、各外周刃１２は、粗削り刃１５と、粗削り刃１５の回転方向後方側に配置された仕上げ刃１６とを有して構成されている。 Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 to 4, an end mill 10 according to an embodiment of the present invention includes a bottom cutting edge 11 for flat cutting at the bottom and a plurality of outer cutting edges 12 arranged spirally at the outer periphery. This is a shank type milling cutter that has a cutting blade portion 13 and a shank portion 14 that is integrally connected to the cutting blade portion 13 with an axial center aligned, and cuts a work material such as a titanium alloy.
Each outer peripheral blade 12 includes a rough cutting blade 15 and a finishing blade 16 disposed on the rear side in the rotation direction of the rough cutting blade 15.

図１に示すように、エンドミル１０は、超硬合金、ハイス等の硬質材により略円柱状に形成され、先端からＹｍｍの領域に切り刃部１３を設け、基側領域に工作機械に固定されるシャンク部１４を有している。
そして、切り刃部１３の外周部には、対となる粗削り刃１５及び仕上げ刃１６によって構成された外周刃１２が複数（本実施の形態では３つ）等間隔で配置されている。
なお、本実施の形態では、Ｙが２０〜６０ｍｍ（具体的には４０ｍｍ）、シャンク部１４の半径Ｒが６〜１５ｍｍ（具体的には１０ｍｍ）である。 As shown in FIG. 1, the end mill 10 is formed in a substantially cylindrical shape by a hard material such as cemented carbide or high speed steel, and a cutting edge portion 13 is provided in a Ymm region from the tip, and is fixed to a machine tool in a base region. The shank part 14 is provided.
A plurality (three in the present embodiment) of outer peripheral blades 12 constituted by rough cutting blades 15 and finishing blades 16 are arranged at equal intervals on the outer peripheral portion of the cutting blade portion 13.
In the present embodiment, Y is 20 to 60 mm (specifically 40 mm), and the radius R of the shank portion 14 is 6 to 15 mm (specifically 10 mm).

図１、図３に示すように、エンドミル１０の軸心回りの回転方向Ｔの向きを前方として、対となる粗削り刃１５及び仕上げ刃１６は、粗削り刃１５が、仕上げ刃１６の前方に配置され、その配置間隔は、エンドミル１０の軸心Ｏ回りの全周３６０°に対して、角度差αとなる。ここで、エンドミル１０の軸心Ｏ回りの全周３６０°に対する、各仕上げ刃１６の配置間隔を角度差Ｋ（本実施の形態では、Ｋ＝１２０°）とすると、αは、以下の式が成立する値であり、本実施の形態ではα＝５０°である。
Ｋ／６＜α＜Ｋ／２ （式１）
なお、粗削り刃１５及び仕上げ刃１６は、切り刃部１３で、エンドミル１０の先端に向かうに従って、回転方向Ｔの向きに捩れて、螺旋状に配置されている。 As shown in FIGS. 1 and 3, the roughing blade 15 and the finishing blade 16 are arranged in front of the finishing blade 16 with the direction of the rotation direction T around the axis of the end mill 10 as the front. The arrangement interval is an angle difference α with respect to the entire circumference 360 ° around the axis O of the end mill 10. Here, if the arrangement interval of each finishing blade 16 with respect to the entire circumference 360 ° around the axis O of the end mill 10 is an angular difference K (K = 120 ° in the present embodiment), α can be expressed by the following equation: This value is established, and in this embodiment, α = 50 °.
K / 6 <α <K / 2 (Formula 1)
The rough cutting blade 15 and the finishing blade 16 are twisted in the direction of the rotation direction T toward the tip of the end mill 10 at the cutting blade portion 13 and are arranged in a spiral shape.

図１、図２に示すように、粗削り刃１５の後方には、粗削り刃１５に連続して形成された第１の逃げ面１８と、第１の逃げ面１８の後端部に連続して形成された第２の逃げ面１９が配置されている。第１、第２の逃げ面１８、１９の逃げ角、即ちエンドミル１０の回転方向Ｔに対する第１、第２の逃げ面１８、１９の角度（逃げ角）φ１、φ２は、それぞれ５〜１５°の範囲、及び１０〜３０°の範囲であり、φ１はφ２に比べて小さい。なお、本実施の形態では、φ１＝８°、φ２＝２０°である。 As shown in FIGS. 1 and 2, on the rear side of the rough cutting blade 15, a first flank 18 continuously formed on the rough cutting blade 15 and a rear end portion of the first flank 18 are continuously provided. The formed second flank 19 is arranged. The clearance angles of the first and second flank surfaces 18 and 19, that is, the angles (flank angles) φ1 and φ2 of the first and second flank surfaces 18 and 19 with respect to the rotation direction T of the end mill 10 are 5 to 15 °, respectively. And a range of 10 to 30 °, and φ1 is smaller than φ2. In this embodiment, φ1 = 8 ° and φ2 = 20 °.

また、仕上げ刃１６の後方には、仕上げ刃１６に連続して形成された逃げ面２０が設けられ、逃げ面２０の逃げ角φ３は５〜２０°の範囲で、本実施の形態では、φ３＝１０°である。
この第１、第２の逃げ面１８、１９、及び逃げ面２０を設けることによって、切削加工時に、粗削り刃１５及び仕上げ刃１６が被削材に食い込み過ぎないようにし、ビビリ振動の発生を防止している。 Further, a clearance surface 20 formed continuously from the finishing blade 16 is provided behind the finishing blade 16, and the clearance angle φ3 of the clearance surface 20 is in the range of 5 to 20 °, and in this embodiment, φ3 = 10 °.
By providing the first and second flank surfaces 18 and 19 and the flank surface 20, the roughing blade 15 and the finishing blade 16 are prevented from excessively biting into the work material during cutting, thereby preventing chatter vibration. doing.

また、第２の逃げ面１９と仕上げ刃１６の間には、仕上げ刃１６に沿って螺旋状に湾曲して配置された溝２１が設けられ、この溝２１によって被削材の切屑を排出することができる。
図２に示すように、溝２１は断面Ｕ字状に形成され、溝２１には、回転方向Ｔ側に向いて配置されたすくい面２２が設けられている。なお、すくい面２２は、表面が凹曲面状に形成されている。 A groove 21 is provided between the second flank 19 and the finishing blade 16 so as to be spirally curved along the finishing blade 16. Chips of the work material are discharged by the groove 21. be able to.
As shown in FIG. 2, the groove 21 is formed in a U-shaped cross section, and the groove 21 is provided with a rake face 22 arranged facing the rotation direction T side. The rake face 22 has a concave curved surface.

仕上げ刃１６は、すくい面２２と逃げ面２０が交差する稜線に配置され、すくい角γ１、即ち、すくい面２２と逃げ面２０の交差箇所での、回転方向Ｔの直交方向に対するすくい面２２の角度は、０〜１０°の範囲（本実施の形態では、γ１＝８°）であるので、すくい角が大きすぎ、被削材への仕上げ刃１６の食い込みが深くなるのを防止している。
また、仕上げ刃１６は、図３に示すように切り刃部１３の異なる位置で、軸心Ｏに対する捩れ角度θが、２０〜４０°の範囲（本実施の形態では、θ＝３２．５°）で一定に形成されているので、切削によって被削材の切削面を滑らかに加工することができる。 The finishing blade 16 is arranged at a ridge line where the rake face 22 and the flank 20 intersect, and the rake angle γ1, that is, at the intersection of the rake face 22 and the flank 20, Since the angle is in the range of 0 to 10 ° (γ1 = 8 ° in the present embodiment), the rake angle is too large, and the biting of the finishing blade 16 into the work material is prevented from deepening. .
Further, the finishing blade 16 has a twist angle θ with respect to the axis O in a range of 20 to 40 ° at different positions of the cutting blade portion 13 as shown in FIG. 3 (θ = 32.5 ° in the present embodiment). ), The cutting surface of the work material can be smoothly machined by cutting.

逃げ面２０と粗削り刃１５の間には、螺旋状に湾曲して配置された溝２３が設けられ、被削材の切屑は、溝２３によっても排出される。
溝２３は、溝２１と同様に、断面Ｕ字状に形成されている。そして、図２に示すように、溝２３には、凹曲面状に形成され、回転方向Ｔ側に向かって配置されたすくい面２４が設けられている。 Between the flank 20 and the rough cutting blade 15, a groove 23 is provided that is spirally curved, and chips of the work material are also discharged by the groove 23.
Similarly to the groove 21, the groove 23 is formed in a U-shaped cross section. As shown in FIG. 2, the groove 23 is provided with a rake face 24 that is formed in a concave curved surface shape and is arranged toward the rotation direction T side.

粗削り刃１５は、すくい面２４と第１の逃げ面１８が交差する稜線に配置され、すくい角γ２が、０〜１０°の範囲（本実施の形態では、γ２＝５°）となるように形成されている。なお、本実施の形態では、γ１及びγ２が、γ１＞γ２の関係になっているが、γ１≦γ２の関係でもよい。
また、粗削り刃１５は、図１、図３に示すように、軸心Ｏに対する捩れ角度が増減を繰り返して形成され、捩れ角度が一定となっていないので、粗削り刃１５は、被削材を削り取る際に生じる抵抗が、粗削り刃１５の場所によって異なり、捩れ角度が一定の仕上げ刃１６に比べて、被削材を深く削り取ることが可能である。 The rough cutting blade 15 is arranged at a ridge line where the rake face 24 and the first flank 18 intersect, and the rake angle γ2 is in a range of 0 to 10 ° (γ2 = 5 ° in the present embodiment). Is formed. In the present embodiment, γ1 and γ2 have a relationship of γ1> γ2, but may have a relationship of γ1 ≦ γ2.
Further, as shown in FIGS. 1 and 3, the rough cutting blade 15 is formed by repeatedly increasing and decreasing the twist angle with respect to the axis O, and the twist angle is not constant. The resistance generated when scraping is different depending on the location of the rough cutting blade 15, and the work material can be cut deeper than the finishing blade 16 having a constant twist angle.

粗削り刃１５は、捩れ角度が角度θの６５〜１３５％の範囲で規則的に増減し、振幅及び波長が等しい複数の波形（例えばサインカーブ）によって波形状に形成されている。
また、波形状に形成された粗削り刃１５の各波形の周期、即ち増減する捩れ角度の周期は、切り刃部１３の軸心回りの全周３６０°に対して２５〜５０°の範囲にある。本実施の形態では、粗削り刃１５が、３．５個のサインカーブによって形成され、各サインカーブの捩れ角度の最小角θｓ及び、最大角θｂは、それぞれθの６５〜８０％及び１２０〜１３５％の範囲にでき、例えば、θｓ＝２５°、θｂ＝４０°である。 The rough cutting blade 15 is formed into a wave shape by a plurality of waveforms (for example, a sine curve) whose twist angle is regularly increased or decreased within a range of 65 to 135% of the angle θ and having the same amplitude and wavelength.
In addition, the period of each waveform of the rough cutting blade 15 formed in a wave shape, that is, the period of the torsional angle to be increased or decreased, is in the range of 25 to 50 ° with respect to the entire 360 ° around the axis of the cutting blade portion 13. . In the present embodiment, the rough cutting edge 15 is formed by 3.5 sine curves, and the minimum angle θs and the maximum angle θb of the twist angle of each sine curve are 65 to 80% and 120 to 135, respectively, of θ. % Range, for example, θs = 25 ° and θb = 40 °.

図２に示すように、粗削り刃１５及び仕上げ刃１６の、エンドミル１０の軸心Ｏからの距離、即ち刃先半径は、仕上げ刃１６の刃先半径Ｌ１が、粗削り刃１５の刃先半径Ｌ２に比べて、Ｌ２の１／１００以下の範囲で大きくなっている。従って、仕上げ刃１６は、粗削り刃１５に比べて、被削材を深く削り取ることができ、被削材は仕上げ刃１６により滑らかに切削される。
なお、本実施の形態では、Ｌ１＝１０．００ｍｍ、Ｌ２＝９．９８ｍｍであり、Ｌ１はシャンク部１４の半径Ｒに等しくなっている。 As shown in FIG. 2, the distance between the rough cutting edge 15 and the finishing edge 16 from the axis O of the end mill 10, that is, the cutting edge radius, the cutting edge radius L <b> 1 of the finishing edge 16 is larger than the cutting edge radius L <b> 2 of the rough cutting edge 15. , L2 is larger in the range of 1/100 or less. Accordingly, the finishing blade 16 can cut the work material deeper than the rough cutting blade 15, and the work material is smoothly cut by the finishing blade 16.
In the present embodiment, L1 = 10.00 mm and L2 = 9.98 mm, and L1 is equal to the radius R of the shank portion 14.

ここで、対となる粗削り刃１５と仕上げ刃１６の配置間隔（角度差）α、及び仕上げ刃１６とその仕上げ刃１６の回転方向後側に配置された粗削り刃１５の配置間隔Ｋ−αには、式１より、以下の関係が成立する。
Ｋ−α＞α （式２）
即ち、仕上げ刃１６は、回転方向前後に隣り合う粗削り刃１５の中間位置より前方側に配置されることになる。
従って、Ｌ１＞Ｌ２の関係にある粗削り刃１５及び仕上げ刃１６の両刃が被削材を切削可能な条件幅を広くすること、即ち、Ｌ１≦Ｌ２の場合に比べて、エンドミル１０の軸心Ｏ回りの回転数Ｔｏを上げること、及び被削材に対するエンドミル１０の送り速度Ｓｏを遅くすることが可能である。
これにより、仕上げ刃１６は、仕上げ刃のみを設けたエンドミルに比べて、被削材の削り取り一回あたりの切削量が少なくなるので、切削加工時に生じる仕上げ刃１６への負担が小さく、刃こぼれの発生を少なくし、刃の摩耗量を低減することができる。 Here, the arrangement interval (angle difference) α between the paired rough cutting blade 15 and the finishing blade 16 and the arrangement interval K−α of the rough cutting blade 15 arranged on the rear side in the rotation direction of the finishing blade 16 and the finishing blade 16 are set. From Equation 1, the following relationship is established.
K-α> α (Formula 2)
That is, the finishing blade 16 is disposed on the front side of the intermediate position between the rough cutting blades 15 adjacent to each other in the front-rear direction.
Accordingly, the rough cutting edge 15 and the finishing edge 16 having a relationship of L1> L2 have a wider condition width for cutting the work material, that is, the axis O of the end mill 10 is larger than that in the case of L1 ≦ L2. It is possible to increase the rotational speed To and the feed speed So of the end mill 10 with respect to the work material.
As a result, the finishing blade 16 has a smaller amount of cutting per work piece than the end mill provided with only the finishing blade, so the burden on the finishing blade 16 generated during the cutting process is small and the spilling of the blade occurs. Can be reduced, and the amount of wear of the blade can be reduced.

そして、エンドミル１０を用いて、α＝５０°、Ｋ＝１２０°、回転数Ｔｏ＝１６００回転／分、送り速度Ｓｏ＝３８４ｍｍ／分の条件下で、エンドミル１０の側部を被削材に当て、軸心Ｏに直交する方向に被削材を２ｍｍの深さで切削し、粗削り刃１５及び仕上げ刃１６の両方の刃によって被削材を削り取ること、及び仕上げ刃のみのエンドミルと比べて仕上げ刃の摩耗量が低減されることを確認した。 Then, using the end mill 10, the side portion of the end mill 10 is applied to the work material under the conditions of α = 50 °, K = 120 °, the rotation speed To = 1600 rotations / minute, and the feed speed So = 384 mm / minute. The work material is cut at a depth of 2 mm in a direction perpendicular to the axis O, and the work material is scraped off by both the rough cutting edge 15 and the finishing edge 16, and finished in comparison with an end mill having only a finishing edge. It was confirmed that the amount of wear of the blade was reduced.

図４に示すように、エンドミル１０の底部には、３条の粗削り刃１５にそれぞれ連続して形成された第１の底面刃２６、２７、２８と、３条の仕上げ刃１６にそれぞれ連続して形成された第２の底面刃２９、３０、３１が設けられ、底刃１１は、第１の底面刃２６、２７、２８及び第２の底面刃２９、３０、３１を有して構成されている。
第１の底面刃２６と第２の底面刃２９、第１の底面刃２７と第２の底面刃３０、及び第１の底面刃２８と第２の底面刃３１はそれぞれ対となって設けられている。また、第２の底面刃２９は、第２の底面刃３０、３１に比べて刃長が長く、第２の底面刃２９の刃の基端はエンドミル１０の底部中央に位置する。 As shown in FIG. 4, the bottom portion of the end mill 10 is connected to first bottom blades 26, 27, 28 formed continuously with three rough cutting blades 15, and three finishing blades 16, respectively. The second bottom blades 29, 30, and 31 are formed, and the bottom blade 11 is configured to include the first bottom blades 26, 27, and 28 and the second bottom blades 29, 30, and 31. ing.
The first bottom blade 26 and the second bottom blade 29, the first bottom blade 27 and the second bottom blade 30, and the first bottom blade 28 and the second bottom blade 31 are provided in pairs. ing. Further, the second bottom blade 29 has a longer blade length than the second bottom blades 30 and 31, and the base end of the second bottom blade 29 is located at the bottom center of the end mill 10.

そして、第１の底面刃２６、２７、２８の回転方向Ｔの後方側には、それぞれ底逃げ面３２、３３、３４が形成され、底逃げ面３２、３３、３４と第２の底面刃２９、３０、３１の間には、被削材の切屑を排出するギャッシュ３５、３６、３７がそれぞれ設けられている。
また、第２の底面刃２９、３０、３１の回転方向Ｔの後方側には、それぞれ第１の底逃げ面３８、３９、４０が設けられ、第１の底逃げ面３８、３９、４０の後方側には、それぞれ第２の底逃げ面４１、４２、４３が形成されている。
そして、エンドミル１０の底部には、ギャッシュ３５、３６、３７とは別に、切屑を排出するギャッシュ４４、４５、４６が設けられている。ギャッシュ４４は、第２の底逃げ面４１と第１の底面刃２７の間に配置され、ギャッシュ４５、４６はエンドミル１０の底部中央領域に配置されている。 Further, bottom relief surfaces 32, 33, and 34 are formed on the rear side in the rotation direction T of the first bottom blades 26, 27, and 28, respectively, and the bottom relief surfaces 32, 33, and 34 and the second bottom blade 29 are formed. , 30, 31 are provided with gashes 35, 36, 37 for discharging chips of the work material, respectively.
In addition, on the rear side in the rotation direction T of the second bottom blades 29, 30, 31 are provided first bottom relief surfaces 38, 39, 40, respectively, of the first bottom relief surfaces 38, 39, 40. On the rear side, second bottom relief surfaces 41, 42, and 43 are formed, respectively.
In addition to the gashes 35, 36, and 37, gashs 44, 45, and 46 for discharging chips are provided at the bottom of the end mill 10. The gash 44 is disposed between the second bottom clearance surface 41 and the first bottom blade 27, and the gashes 45 and 46 are disposed in the bottom center region of the end mill 10.

以上、本発明の実施の形態を説明したが、本発明は、上記した形態に限定されるものでなく、要旨を逸脱しない条件の変更等は全て本発明の適用範囲である。
例えば、粗削り刃及び仕上げ刃を２対あるいは４対以上設けることができる。 Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, two pairs or four or more pairs of rough cutting blades and finishing blades can be provided.

１０：エンドミル、１１：底刃、１２：外周刃、１３：切り刃部、１４：シャンク部、１５：粗削り刃、１６：仕上げ刃、１８：第１の逃げ面、１９：第２の逃げ面、２０：逃げ面、２１：溝、２２：すくい面、２３：溝、２４：すくい面、２６〜２８：第１の底面刃、２９〜３１：第２の底面刃、３２〜３４：底逃げ面、３５〜３７：ギャッシュ、３８、３９、４０：第１の底逃げ面、４１〜４３：第２の底逃げ面、４４〜４６：ギャッシュ 10: End mill, 11: Bottom blade, 12: Perimeter blade, 13: Cutting blade portion, 14: Shank portion, 15: Roughing blade, 16: Finishing blade, 18: First flank, 19: Second flank , 20: flank, 21: groove, 22: rake face, 23: groove, 24: rake face, 26-28: first bottom edge, 29-31: second bottom edge, 32-34: bottom relief 35, 37: Gash, 38, 39, 40: First bottom flank, 41-43: Second bottom flank, 44-46: Gash

Claims (2)

底部に平面切削用の底刃を、外周部に螺旋状に配置された複数の外周刃を備えた切り刃部と、該切り刃部に軸心を合わせて一体的に連結するシャンク部とを有するエンドミルにおいて、
前記各外周刃は、粗削り刃と、該粗削り刃の回転方向後方側に配置された仕上げ刃とを有し、しかも、前記仕上げ刃の刃先半径が、前記粗削り刃の刃先半径に比べて、該粗削り刃の刃先半径の１／１００以下の範囲で大きくなって、
前記仕上げ刃は、回転方向前後に隣り合う前記粗削り刃の中間位置より前方側に配置され、前記切り刃部の軸心方向に対する前記仕上げ刃の捩れ角度は、角度θで一定であり、前記切り刃部の軸心方向に対する前記粗削り刃の捩れ角度は、前記角度θの６５〜１３５％の範囲で規則的に増減し、かつ該規則的な増減の周期は、該切り刃部の軸心回りの全周３６０°に対して２５〜５０°の範囲にあることを特徴とするエンドミル。 A bottom blade for plane cutting at the bottom, a cutting blade portion having a plurality of outer peripheral blades spirally arranged at the outer peripheral portion, and a shank portion integrally connected to the cutting blade portion with its axis aligned In an end mill having
Each of the outer peripheral blades has a rough cutting blade and a finishing blade arranged on the rear side in the rotation direction of the rough cutting blade, and the edge radius of the finishing blade is larger than the cutting edge radius of the rough cutting blade. It becomes larger in the range of 1/100 or less of the cutting edge radius of the roughing blade ,
The finishing blade is disposed in front of an intermediate position between the roughing blades adjacent to each other in the rotational direction, and the twist angle of the finishing blade with respect to the axial direction of the cutting blade portion is constant at an angle θ. The twist angle of the rough cutting blade with respect to the axial direction of the blade portion regularly increases and decreases within a range of 65 to 135% of the angle θ, and the periodic increase and decrease cycle is around the axis of the cutting blade portion. end mill, wherein a range near Rukoto of 25 to 50 ° with respect to the entire circumference 360 ° a. 請求項１記載のエンドミルにおいて、前記底刃は、前記粗削り刃及び前記仕上げ刃にそれぞれ連続して形成された第１、第２の底面刃を有することを特徴とするエンドミル。 2. The end mill according to claim 1 , wherein the bottom blade includes first and second bottom blades that are continuously formed on the rough cutting blade and the finishing blade, respectively.
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