JP2005014202A - Multi-cutting edge ball end mill - Google Patents
Multi-cutting edge ball end mill Download PDFInfo
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本発明は、金型の３次元加工等に用いる多刃ボールエンドミルに関する。 The present invention relates to a multi-blade ball end mill used for three-dimensional machining of dies.
金型の３次元加工等に用いるボールエンドミルとして、特に高能率加工を行うために、３枚以上の刃数を有した多刃ボールエンドミルが使用されており、主切刃と副切刃を備えた親子刃タイプのもの（特許文献１）、各々のランドのエッジが全て底刃全体の頂点中心部に接するよう構成した、軸心合わせタイプのもの（特許文献２）、ボール刃のノーズ部分に略Ｖ字状のノッチを設けたもの（特許文献３）がある。
ボールエンドミルによる仕上げ加工においては、加工精度が重要であり、ボール刃の回転軌跡の良好な真球度が必要であるが、ボール刃に所定の逃げ角を付与するため、軸心部付近は、３枚以上の多刃の場合、次刃との砥石干渉を避ける為に、軸心部を越えて、砥石を回り込ませることができず、軸心部に突起が残り、ボール刃の回転軌跡の真球度が得られず、アール精度に課題があった。
多刃のボールエンドミルは、刃数を増やしたことにより、送り速度が上げられ、加工能率が向上するが、加工精度に課題があった。特許文献１記載の親子刃では、軸心付近で親刃のみで切削することになり、送り速度を上げることができず、送り速度を上げると親刃の負担が大きくなり、子刃の軸心側端にエッジを有することから、チッピングや欠損を生じていた。特許文献２記載の軸心合わせは、ボール刃は所定の逃げ角を付与するため、軸心部付近は、次刃との砥石干渉や、砥石干渉を避けるが為に、軸心部に突起が残り、軸心部付近のアール精度が得にくく、特許文献３記載のノッチを設けたものは、ノッチ部でアール精度が大きくマイナスし、ボールエンドミル自体のアール精度が得られておらず、加工精度に課題があった。
本発明の課題は、良好なアール精度が得られ、良好な加工精度が得られるボールエンドミルを提供することである。
In finishing processing with a ball end mill, processing accuracy is important, and a good sphericity of the ball blade's rotation trajectory is necessary, but in order to give a predetermined clearance angle to the ball blade, In case of 3 or more multi-edged blades, in order to avoid grinding wheel interference with the next blade, the grinding wheel cannot be passed over the shaft center part, and a protrusion remains on the shaft center part. The sphericity could not be obtained, and there was a problem with R accuracy.
The multi-blade ball end mill increases the feed rate and increases the machining efficiency by increasing the number of blades, but has a problem in machining accuracy. In the parent-child blade described in Patent Document 1, cutting is performed with only the parent blade in the vicinity of the axis, and the feed rate cannot be increased. If the feed rate is increased, the burden on the parent blade increases, and the axis of the child blade is increased. Since the side edge has an edge, chipping and chipping occurred. In the axial alignment described in Patent Document 2, since the ball blade gives a predetermined clearance angle, in the vicinity of the axial center portion, there is a protrusion on the axial center portion in order to avoid grinding wheel interference with the next blade and grinding wheel interference. The remaining rounding accuracy in the vicinity of the shaft center is difficult to obtain, and those provided with the notch described in Patent Document 3 have a large negative accuracy at the notch, and the rounding accuracy of the ball end mill itself has not been obtained. There was a problem.
An object of the present invention is to provide a ball end mill that can obtain good rounding accuracy and good machining accuracy.
本願発明は、エンドミル先端に３枚以上のボール刃を有するボールエンドミルにおいて、該エンドミル底面視で、軸心部に心残し部を設け、該軸心部付近に、該ボール刃から変曲して延伸する切れ刃を設け、各ボール刃から延伸した該切れ刃が略多角形状をなすように変曲させたことを特徴とする多刃ボールエンドミルである。 The present invention provides a ball end mill having three or more ball blades at the tip of the end mill, wherein a center-remaining portion is provided in the axial center portion when viewed from the bottom of the end mill, A multi-blade ball end mill having a cutting edge to be extended and inflected so that the cutting edge extended from each ball blade has a substantially polygonal shape.
本発明を適用することにより、良好なアール精度が得られ、良好な加工精度が得られる３枚刃以上の多刃ボールエンドミルを提供することができた。 By applying the present invention, it was possible to provide a multi-blade ball end mill having three or more blades, which can obtain good rounding accuracy and good machining accuracy.
本発明は、心残し部を設けることにより、エンドミル先端の摩滅量を抑制し、アール精度及び切削性を維持しつつ、軸心部付近の強度が向上し、高精度な加工が持続できる。該ボール刃から変曲して延伸する切れ刃を設けることにより、アール精度が得られる。該切れ刃は、ボール刃の回転軌跡である球面にほぼ沿った面、例えば、逃げ角で５°以下の面にする。各ボール刃から延伸した該切れ刃を略多角形状に変曲させることにより、被加工物とのクリアランスが少ない部分を減少でき、略多角形状の各辺が稜状となることから、その一部に切削性が生じ、切削抵抗が減少し、高精度な加工ができる。ここで、略多角形状の頂点は、ボール刃上に位置することが望ましく、ボール刃との差が無くなり、切削性がより安定し、加工面が規則的になり、良好な加工面が得られる。また、略多角形状の頂点が心残し部の外接円の外側に位置しても本発明の範疇であることは言うまでもない。 In the present invention, by providing the center-remaining portion, the wear amount at the end of the end mill is suppressed, the roundness accuracy and the machinability are maintained, the strength in the vicinity of the shaft center portion is improved, and highly accurate machining can be continued. By providing a cutting edge that bends and extends from the ball blade, rounded accuracy is obtained. The cutting edge is a surface substantially along a spherical surface that is the rotation locus of the ball blade, for example, a surface having a clearance angle of 5 ° or less. By inflection of the cutting edge extending from each ball blade into a substantially polygonal shape, the portion with a small clearance from the workpiece can be reduced, and each side of the substantially polygonal shape becomes a ridge shape. As a result, cutting performance is reduced, cutting resistance is reduced, and high-precision processing can be performed. Here, it is desirable that the apex of the substantially polygonal shape is located on the ball blade, there is no difference from the ball blade, the machinability is more stable, the machining surface is regular, and a good machining surface is obtained. . Further, it goes without saying that even if the apex of the substantially polygonal shape is located outside the circumscribed circle of the heart leaving portion, it is within the scope of the present invention.
実施の態様として、ボール刃はセンタカット、等底刃に形成すると、切削負荷をボール刃毎に分散でき、加工面が規則的になり、良好な加工面が得られる。また、ボール刃を不等分割に配置したことにより、通常の等分割品より切削抵抗を減少させると共に、ビビリ振動を抑制し、より高能率、高精度な加工ができる。
次に、軸心を中心とする略多角形状の内接円の直径が小さくなる方向に、略多角形状の各辺を凹状に設けたことにより、略多角形状の面積を小さくでき、一層、被加工物とのクリアランスが少ない部分を減少でき、切削抵抗が減少し、高精度な加工ができる。更に、略多角形状の内接円の直径は、良好なアール精度を得ると共に、被加工物とのクリアランスが少ない部分を減少するために、略多角形状の外接円の直径の５０％未満が望ましい。また、エンドミル先端の摩滅量を抑制するために、好ましくは、３０％以上が望ましい。
As an embodiment, when the ball blade is formed in a center cut or an equal bottom blade, the cutting load can be distributed for each ball blade, the processed surface becomes regular, and a good processed surface is obtained. Further, by arranging the ball blades in an unequally divided manner, the cutting resistance is reduced as compared with a normal equally divided product, and chatter vibration is suppressed, so that highly efficient and highly accurate machining can be performed.
Next, by providing each side of the substantially polygonal shape in a direction in which the diameter of the inscribed circle of the substantially polygonal shape centered on the axis is reduced, the area of the substantially polygonal shape can be reduced, and the coverage is further increased. The portion with less clearance from the workpiece can be reduced, cutting resistance is reduced, and highly accurate machining can be performed. Furthermore, the diameter of the substantially polygonal inscribed circle is preferably less than 50% of the diameter of the substantially polygonal circumscribed circle in order to obtain good rounding accuracy and reduce a portion having a small clearance from the workpiece. . Further, in order to suppress the amount of wear at the end mill end, it is preferably 30% or more.
また、心残し幅に相当する、心残し部の外接円の直径が０．０２ｍｍ〜０．３ｍｍとしても良く、数値限定の理由は、０．０２ｍｍよりも小さいと、中心部の強度が十分ではなく、摩滅を抑えることができず、切削加工時において、心残し部のアール精度が維持できなくなる。０．３ｍｍを越えると、心残し部は切削性が劣るため、切削抵抗及び先端部摩耗が増大し、ビビリやムシレを生じ、また、ボール刃と心残し部で切削状態の違いが目立ち、加工面が劣化する。好ましくは０．０８ｍｍ〜０．２ｍｍが望ましい。更に、心残し部には、チゼルエッジ状の稜を有しても良く、チゼルエッジ状の稜により、被加工物との接触部分を減少でき、切削抵抗が減少でき、高精度な加工ができる。
ここで、エンドミル母材に超硬合金やサーメット等の超硬質合金やＣＢＮ、ダイヤモンド等の高硬度焼結体を用いたり、ＴｉＡｌＮ等の硬質皮膜やＣｒ系の潤滑皮膜を施すことにより、長寿命化が計れることは言うまでもない。以下、実施例に基づき、３枚刃のボールエンドミルで本発明を具体的に説明するが、４枚刃以上の多刃のものにおいても、本発明の範疇であることは言うまでもない。
Moreover, the diameter of the circumscribed circle of the heart leaving portion corresponding to the heart leaving width may be 0.02 mm to 0.3 mm, and the reason for limiting the numerical value is that the strength of the central portion is not sufficient if it is smaller than 0.02 mm. Therefore, wear cannot be suppressed, and the rounding accuracy of the remaining portion cannot be maintained during the cutting process. If it exceeds 0.3 mm, the remaining part of the heart is inferior in machinability, resulting in increased cutting resistance and wear at the tip, resulting in chatter and mess, and the difference in cutting state between the ball blade and the remaining part of the heart is conspicuous. The surface deteriorates. Preferably it is 0.08 mm-0.2 mm. Furthermore, the remaining portion may have a chisel edge-shaped ridge, and the chisel edge-shaped ridge can reduce the contact portion with the workpiece, reduce cutting resistance, and perform highly accurate machining.
By using a hard alloy such as cemented carbide or cermet, or a high hardness sintered body such as CBN or diamond, or applying a hard coating such as TiAlN or a Cr-based lubricant coating to the end mill base material Needless to say, it is possible to make it easier. Hereinafter, the present invention will be specifically described with a three-blade ball end mill based on examples, but it goes without saying that a multi-blade having four or more blades is also within the scope of the present invention.
（実施例１）
本発明例１は、図１、図２に示すボール半径２ｍｍ、刃数３枚刃の超微粒子超硬合金製、ＴｉＡｌＮコ−ティングを３μｍ被覆したソリッドボールエンドミルであり、軸心部２に心残し部３を設け、軸心部２付近では、ボール刃１から変曲させて延伸した切れ刃５が略３角形状を形成している。従来例２は特許文献１記載の親子刃、従来例３は特許文献２記載の軸心合わせ、従来例４は特許文献３記載のノッチを設けたの３枚刃のボールエンドミルを同寸法で製作し、アール精度を測定後、切削テストを行った。切削条件は、被削材に硬さＨＲＣ４０のプリハードン鋼を用い、回転数８０００ｍｉｎ−１、送り速度２４００ｍｍ／ｍｉｎ、切り込み量はエンドミル軸方向に０．２ｍｍ、ピック方向に０．１ｍｍとし、水溶性の切削液を用いた湿式切削による３次元形状の仕上げ加工を行い、加工精度及び加工面の調査を行った。
その結果、本発明例１のアール精度は、軸心部付近を含め、ボール半径２ｍｍに対し、±０．００５０ｍｍの範囲であり、軸心部には突起が存在せず、良好なアール精度であった。切削テストでは、軸心部付近の摩滅量が切削長１００ｍではほとんどなく、切削長５００ｍ、０．００３ｍｍ程度と微小であり、加工精度、即ち、３次元形状のフォーム誤差が５μｍ以下、加工面粗さが最大高さ面粗さＲｚで３μｍと共に良好であった。従来例２は、アール精度±０．００５０ｍｍと本発明例１とほぼ同等であったが、親刃に切削初期にチッピングや欠損を生じ、加工精度、加工面粗さが得られず、寿命となった。従来例３は、軸心部のアール精度が＋０．０２５ｍｍと劣り、加工精度がフォーム誤差で３０μｍを越え、この突起により、加工面に深い傷を生じ、加工面粗さが最大高さ面粗さＲｚで３７μｍと劣った。従来例４は、ノッチ部でアール精度が大きくマイナスしており、切り込み過ぎや、削り残しを生じることから、３次元形状の仕上げ加工に使用できる状態ではなかった。
(Example 1)
Example 1 of the present invention is a solid ball end mill made of an ultrafine particle cemented carbide with a ball radius of 2 mm and a number of blades of 3 blades shown in FIGS. 1 and 2 and coated with 3 μm of TiAlN coating. The remaining portion 3 is provided, and in the vicinity of the axial center portion 2, the cutting blade 5 that is bent and extended from the ball blade 1 forms a substantially triangular shape. Conventional Example 2 is a parent-child blade described in Patent Document 1, Conventional Example 3 is a shaft end alignment described in Patent Document 2, and Conventional Example 4 is a three-blade ball end mill with the same notch described in Patent Document 3. Then, after measuring the radius accuracy, a cutting test was performed. Cutting conditions were pre-hardened steel with hardness HRC40 as the work material, rotation speed 8000 min −1 , feed rate 2400 mm / min, cutting depth 0.2 mm in the end mill axis direction, 0.1 mm in the pick direction, water-soluble Finishing of a three-dimensional shape by wet cutting using the above cutting fluid was performed, and the processing accuracy and surface were investigated.
As a result, the rounding accuracy of Example 1 of the present invention is within a range of ± 0.0050 mm with respect to the ball radius of 2 mm including the vicinity of the axial center portion, and there is no protrusion on the axial center portion, and the excellent rounding accuracy is achieved. there were. In the cutting test, the amount of wear near the shaft center is almost not a cutting length of 100 m, but a cutting length of 500 m and about 0.003 mm, and the processing accuracy, that is, the three-dimensional shape form error is 5 μm or less, and the processing surface is rough. The maximum height surface roughness Rz was good with 3 μm. Conventional Example 2 had a rounded accuracy of ± 0.0050 mm, which was substantially equivalent to Example 1 of the present invention. However, chipping or chipping occurred in the parent blade at the initial stage of cutting, and the processing accuracy and surface roughness were not obtained. became. Conventional example 3 has an inferior rounded accuracy of +0.025 mm in the axial center, and the machining accuracy exceeds 30 μm in terms of foam error. This projection causes deep scratches on the machined surface, and the machined surface roughness is the maximum surface roughness. Rz was inferior to 37 μm. Conventional Example 4 is not in a state where it can be used for finishing processing of a three-dimensional shape because the rounded accuracy is greatly minus at the notch portion, and excessive cutting and uncut parts are generated.
（実施例２）
本発明例１と同様の仕様で、切れ刃が略３角形状をなす軸心部付近の外接円の直径に対する内接円の直径の比率を本発明例５として５０％、本発明例６として４５％、本発明例７として４０％、本発明例８として３５％、本発明例９として３０％、本発明例１０として２５％であるボールエンドミルを製作し、実施例１と同様にアール精度を測定後、切削テストを行った。尚、本発明例５は、略多角形状の各辺がほぼ直線状であり、本発明例６〜１０は凹状である。その結果、本発明例５〜１０は全て、±０．００２５〜０．００５０ｍｍの良好なアール精度であり、軸心部付近の摩滅量は、切削長５００ｍ時において、本発明例５〜９が０．０３ｍｍ以下、本発明例１０が０．０５ｍｍで若干劣ったが微小であり、フォーム誤差が５μｍ以下と良好な加工精度であった。また、加工面粗さについては、本発明例１０がムシレ、ビビリにより、最大高さ面粗さＲｚで１１μｍと劣った他は、５μｍ以下の良好な加工面粗さであった。
(Example 2)
The ratio of the diameter of the inscribed circle to the diameter of the circumscribed circle in the vicinity of the axial center where the cutting edge has a substantially triangular shape with the same specifications as Example 1 of the present invention is 50% as Example 5 of the present invention, and Example 6 of the present invention. A ball end mill of 45%, 40% as Invention Example 7, 35% as Invention Example 8, 30% as Invention Example 9, and 25% as Invention Example 10 was manufactured. After measuring, a cutting test was performed. In the invention example 5, each side of the substantially polygonal shape is substantially linear, and the invention examples 6 to 10 are concave. As a result, Examples 5 to 10 of the present invention all have a good radius accuracy of ± 0.0025 to 0.0050 mm, and the amount of wear in the vicinity of the shaft center is that of Examples 5 to 9 of the present invention when the cutting length is 500 m. 0.03 mm or less, Invention Example 10 was slightly inferior at 0.05 mm, but it was very small, and the foam error was 5 μm or less, which was good processing accuracy. As for the machined surface roughness, the invention example 10 was a good machined surface roughness of 5 μm or less except that the maximum height surface roughness Rz was inferior to 11 μm due to mussels and chatter.
（実施例３）
本発明例１と同様の仕様で、心残し部の外接円の直径が、本発明例１１として０．０１ｍｍ、本発明例１２として０．０２ｍｍ、本発明例１３として０．０４ｍｍ、本発明例１４として０．０６ｍｍ、本発明例１５として０．０８ｍｍ、本発明例１６として０．１ｍｍ、本発明例１７として０．１５ｍｍ、本発明例１８として０．２ｍｍ、本発明例１９として０．２５ｍｍ、本発明例２０として０．３ｍｍ、本発明例２１として０．３５ｍｍであるボールエンドミルを製作し、実施例１と同様にアール精度を測定後、切削テストを行った。その結果、本発明例１１〜２１は全て、±０．００２５〜０．００５０ｍｍの良好なアール精度であり、軸心部付近の摩滅量が、切削長５００ｍ時においても、０．００７ｍｍ以下と微小であり、特に本発明例１２〜１４が０．００５ｍｍ以下、本発明例１５〜２１が０．００３ｍｍ以下であり、フォーム誤差が５μｍ以下と良好な加工精度であった。また、加工面粗さについては、本発明例１９、２０が僅かにムシレを生じ、本発明例２１がムシレ、ビビリにより、最大高さ面粗さＲｚで７〜１２μｍ若干劣った他は、５μｍ以下の良好な加工面粗さであった。
Example 3
The diameter of the circumscribed circle of the heart-remaining portion is 0.01 mm as Invention Example 11, 0.02 mm as Invention Example 12, 0.04 mm as Invention Example 13 and 0.04 mm as Invention Example with the same specifications as in Invention Example 1. 14 as 0.06 mm, Invention Example 15 as 0.08 mm, Invention Example 16 as 0.1 mm, Invention Example 17 as 0.15 mm, Invention Example 18 as 0.2 mm, Invention Example 19 as 0.25 mm A ball end mill having a diameter of 0.3 mm as Invention Example 20 and 0.35 mm as Invention Example 21 was manufactured, and a cutting test was performed after measuring the radius accuracy in the same manner as in Example 1. As a result, all of Examples 11 to 21 of the present invention have good radius accuracy of ± 0.0025 to 0.0050 mm, and the wear amount in the vicinity of the axial center is as small as 0.007 mm or less even when the cutting length is 500 m. In particular, Invention Examples 12 to 14 were 0.005 mm or less, Invention Examples 15 to 21 were 0.003 mm or less, and the foam error was 5 μm or less, which was good processing accuracy. In addition, with respect to the processed surface roughness, Examples 19 and 20 of the present invention produced a slight musiness, and Example 21 of the present invention was 5 μm except that the maximum height surface roughness Rz was slightly inferior by 7 to 12 μm due to musiness and chatter. The following processed surface roughness was good.
（実施例４）
本発明例２２は、図３、図４に示す、本発明例１と同様の仕様で、ボール刃１から軸心部２の方向に延びるチゼルエッジ状の稜６を設け、チゼルエッジ状の稜６から変曲して延伸する切れ刃５を設けた例である。略多角形状の各辺は、チゼルエッジ状の稜６と切れ刃５から構成されるため、凹んだ形をなしている。実施例１と同様にアール精度を測定後、切削テストを行った。その結果、本発明例２２のアール精度は、軸心部付近を含め、ボール半径２ｍｍに対し、±０．００２８ｍｍの範囲であり、軸心部には突起が存在せず、良好なアール精度であった。切削テストにおいても、本発明例１より更に安定した切削ができ、軸心部付近の摩滅量が切削長１００ｍ時ではほとんどなく、切削長５００ｍ時においても、０．００５ｍｍ程度と微小であり、加工精度、即ち、３次元形状のフォーム誤差が５μｍ以下、加工面粗さが最大高さ面粗さＲｚで３μｍと共に良好であった。
(Example 4)
The present invention example 22 is provided with a chisel edge-shaped ridge 6 extending from the ball blade 1 in the direction of the axial center 2 with the same specifications as the present invention example 1 shown in FIGS. This is an example in which a cutting edge 5 that is bent and stretched is provided. Each side of the substantially polygonal shape is formed of a chisel edge-shaped ridge 6 and a cutting edge 5, and thus has a concave shape. A cutting test was performed after measuring the radius accuracy in the same manner as in Example 1. As a result, the rounding accuracy of Example 22 of the present invention is within a range of ± 0.0028 mm with respect to the ball radius of 2 mm including the vicinity of the axial center portion, and there is no protrusion on the axial center portion, and the favorable rounding accuracy is achieved. there were. Also in the cutting test, more stable cutting than in Example 1 of the present invention can be performed, and the amount of wear in the vicinity of the axial center is almost not at the cutting length of 100 m, and is as small as about 0.005 mm even at the cutting length of 500 m. The accuracy, that is, the form error of the three-dimensional shape was 5 μm or less, and the machined surface roughness was good with a maximum height surface roughness Rz of 3 μm.
（実施例５）
本発明例１と同様の仕様で、切れ刃５の逃げ角、本発明例２３として０．５°、本発明例２４として１°、本発明例２５として３°、本発明例２６として５°、本発明例２７として７°であるボールエンドミルを製作し、実施例１と同様にアール精度を測定後、切削テストを行った。その結果、本発明例２３〜２５は、本発明例１と同様、±０．００２９ｍｍの良好なアール精度であり、切削テストにおいても、軸心部付近の摩滅量が切削長１００ｍ時ではほとんどなく、切削長５００ｍ時においても、０．００５ｍｍ程度と微小であり、加工精度、即ち、３次元形状のフォーム誤差が５μｍ以下、加工面粗さが最大高さ面粗さＲｚで３μｍと共に良好であった。本発明例２６は±０．００５０ｍｍで若干劣るものの良好なアール精度であり、切削長５００ｍ時で摩滅量が０．００８ｍｍとなり、加工精度がフォーム誤差で１０μｍ以下と若干劣る結果となった。更に本発明例２７は、軸心部に凸状の突起部が僅かに残り、軸心部のアール精度が＋０．０１２ｍｍと劣り、加工精度がフォーム誤差で１５μｍであり、、この突起により、加工面に傷を生じ、加工面粗さが最大高さ面粗さＲｚで２２μｍと劣る結果となった。
(Example 5)
With the same specifications as Example 1 of the present invention, the clearance angle of the cutting edge 5, 0.5 ° as Example 23, 1 ° as Example 24, 3 ° as Example 25, 5 ° as Example 26 A ball end mill of 7 ° was manufactured as Invention Example 27, and the cutting accuracy was measured in the same manner as in Example 1 and then a cutting test was performed. As a result, Examples 23 to 25 of the present invention have good rounding accuracy of ± 0.0029 mm as in Example 1 of the present invention, and even in the cutting test, the amount of wear near the axial center is almost not at the cutting length of 100 m. Even when the cutting length is 500 m, it is as small as about 0.005 mm, the processing accuracy, that is, the three-dimensional form error is 5 μm or less, and the processing surface roughness is good with a maximum height surface roughness Rz of 3 μm. It was. Invention Example 26 had good rounding accuracy although it was slightly inferior at ± 0.0050 mm, and the abrasion amount was 0.008 mm when the cutting length was 500 m, and the machining accuracy was slightly inferior to 10 μm or less due to foam error. In addition, the inventive example 27 has a slightly protruding projection at the axial center, the radius accuracy of the axial center is inferior to +0.012 mm, and the processing accuracy is 15 μm in form error. The surface was scratched, and the processed surface roughness was inferior to 22 μm at the maximum height surface roughness Rz.
（実施例６）
本発明例１と同様の仕様で、本発明例２８として、３枚のボール刃を各々１１５°、１２０°、１２５°の分割角度で不等分割に配置したボールエンドミルを製作し、実施例２と同様にアール精度を測定後、切削テストを行った。その結果、アール精度は、軸心部付近を含め、ボール半径２ｍｍに対し、±０．００２８ｍｍの範囲であり、本発明例１と同等の良好なアール精度であり、また、切削状態は、切削抵抗が少なくなり、ビビリ振動もなく、非常に安定しており、加工精度、及び、加工面粗さが一層向上した。
(Example 6)
A ball end mill having the same specifications as in the present invention example 1 and having three ball blades arranged at unequal divisions at 115 °, 120 °, and 125 ° division angles as the invention example 28 was produced. In the same manner as above, a cutting test was carried out after measuring the radius accuracy. As a result, the radius accuracy is within a range of ± 0.0028 mm with respect to the ball radius of 2 mm, including the vicinity of the shaft center portion, and is a good radius accuracy equivalent to Example 1 of the present invention. Resistance is reduced, there is no chatter vibration, it is very stable, and machining accuracy and surface roughness are further improved.
１ ボール刃
２ 軸心部
３ 心残し部
４ ボール刃の逃げ面
５ ボール刃から変曲した切れ刃
６ チゼルエッジ状の稜
DESCRIPTION OF SYMBOLS 1 Ball blade 2 Axial center part 3
Claims (5)
5. The multi-blade ball end mill according to claim 1, wherein a diameter of the substantially polygonal inscribed circle is less than 50% of a diameter of the circumscribed circle.
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| JP2004097443A JP3840660B2 (en) | 2003-06-04 | 2004-03-30 | Multi-blade ball end mill |
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| Application Number | Priority Date | Filing Date | Title |
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| JP2003159784 | 2003-06-04 | ||
| JP2004097443A JP3840660B2 (en) | 2003-06-04 | 2004-03-30 | Multi-blade ball end mill |
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| JP3840660B2 JP3840660B2 (en) | 2006-11-01 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7417707B2 (en) | 2020-02-28 | 2024-01-18 | 京セラ株式会社 | End mill and method for manufacturing cut products |
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| EP3213846B1 (en) * | 2014-10-28 | 2019-12-04 | Mitsubishi Hitachi Tool Engineering, Ltd. | Multi flute ball end mill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP7417707B2 (en) | 2020-02-28 | 2024-01-18 | 京セラ株式会社 | End mill and method for manufacturing cut products |
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