JP2010207931A - Ball end mill - Google Patents

Ball end mill Download PDF

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JP2010207931A
JP2010207931A JP2009054447A JP2009054447A JP2010207931A JP 2010207931 A JP2010207931 A JP 2010207931A JP 2009054447 A JP2009054447 A JP 2009054447A JP 2009054447 A JP2009054447 A JP 2009054447A JP 2010207931 A JP2010207931 A JP 2010207931A
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cutting
cutting edge
size
blade
nose
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JP5504527B2 (en
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Shuhei Aida
収平 相田
Atsushi Ishikawa
淳 石川
Takahiro Sudo
貴裕 須藤
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Niigata Prefecture
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Abstract

<P>PROBLEM TO BE SOLVED: To improve cutting accuracy by comprising one or a plurality of main cutting blades reaching a nose and one or a plurality of auxiliary cutting blades provided with a bladeless separated portion between the noses and not reaching the nose, configuring to set the size of chips to large or small by setting the size of the bladeless separated portion of the auxirialy cutting blades to large or small, generating chips by a plurality of the auxirialy cutting blades as well as by the main cutting blades, and generating and removing the chips in the size set by setting the size of the bladeless separated portion to large or small. <P>SOLUTION: The ball end mill includes a plurality of cutting blades K for cutting a workpiece W at a distal end spherical surface of a body E to comprise one or a plurality of the main cutting blades S reaching the nose N, and one or a plurality of the auxiliary cutting blades F provided with the bladeless separated portion M between the noses and not reaching the nose. The size of the bladeless separated portion is set to large or small to set the size of the chips H by the cutting blades to large or small, thus effectively transmitting cutting heat generated by cutting the workpiece to the chips. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は例えばチタン合金、超耐熱合金などの熱伝導率の小さな難切削材の切削加工に用いられるボールエンドミルに関するものである。   The present invention relates to a ball end mill used for cutting difficult-to-cut materials having a low thermal conductivity such as titanium alloys and super heat-resistant alloys.

従来、この種のボールエンドミルとして、例えば、軸状の本体の側周面及び先端球面部に被加工物を切削する複数のねじれ刃状の切刃を備えてなる構造のものが知られている。   2. Description of the Related Art Conventionally, as this type of ball end mill, for example, a structure having a plurality of twisted blade-shaped cutting blades for cutting a workpiece on a side peripheral surface and a tip spherical surface portion of a shaft-shaped main body is known. .

また、切刃による被加工物の切削性及び切刃寿命向上のため、上記切刃をノーズに達する単数又は複数の主切刃と、該ノーズとの間に無刃離隔部を存して該ノーズに達しない単数又は複数の副切刃とで構成し、無刃離隔部の大きさを大小に設定して被加工物を主切刃及び副切刃からなる切刃により段階的に切削することで高速切削や切刃寿命の向上を企図したものも知られている。   Further, in order to improve the machinability of the workpiece and the life of the cutting edge by the cutting edge, there is a blade-less separation part between the nose and the main cutting edge or blades that reach the nose. Consists of one or a plurality of secondary cutting edges that do not reach the nose, and the size of the blade-free separation portion is set to be large or small, and the workpiece is cut stepwise by a cutting edge comprising a primary cutting edge and a secondary cutting edge. There are also known devices designed to improve cutting speed and cutting edge life.

特許第２７２３７６８号公報Japanese Patent No. 2723768 特開平１０−８０８１６号公報Japanese Patent Laid-Open No. 10-80816

しかしながら上記従来構造の場合、上記被加工物の切削により発生する切削熱については、現状において、冷却液などによる冷却手段により除去することに止まり、冷却手段による除去のみにあっては、切削性や切刃寿命、切削精度の向上において制約を受けることがあるという不都合を有している。   However, in the case of the above-described conventional structure, the cutting heat generated by cutting the workpiece is currently only removed by a cooling means such as a cooling liquid. There is an inconvenience that the cutting edge life and cutting accuracy may be restricted.

すなわち、従来構造の場合、冷却液などによる冷却手段により除去しようとする発想に止どまり、切削熱を切り屑に伝導させて除去しようとする知見までには至っていない。すなわち、例えば、チタン合金の熱伝導率は鋼の約６分の１であり、超耐熱合金では約４分の１と小さいことが知られており、一方、切削によって生じる工具刃面の温度θは、近似的に、切削速度Ｖ、送りｆ、熱伝導率κ、密度ρ、比熱Ｃとしたとき、θ＝（Ｖ×ｆ／κ×ρ×Ｃ）1/2で表され、したがって、鉄系材料に比べて熱伝導率が小さな材料では、切削温度が高くなり、高速回転、高速送り加工においては、多くの熱を切り屑に伝導させる必要がある。そこで、発明者らは、切り屑の厚みや大きさを大小に制御し、例えば、ノーズ付近の切り屑の厚み大きさを制御し、ノーズ付近の切り屑の熱容量を大きくすることで切り屑に効果的に熱を伝導させ、切削熱を容易に除去し、切削性や切刃寿命、切削精度の向上を図ることができるという知見に至ったのである。 That is, in the case of the conventional structure, the idea is to be removed by cooling means such as a cooling liquid, and it has not yet reached the knowledge of removing heat by conducting cutting heat to chips. That is, for example, it is known that the thermal conductivity of a titanium alloy is about one-sixth that of steel, and that of a super-heat-resistant alloy is about one-fourth, which is smaller than the temperature θ of a tool blade surface generated by cutting. Is approximately expressed as θ = (V × f / κ × ρ × C) 1/2 when the cutting speed V, feed f, thermal conductivity κ, density ρ, and specific heat C are given. A material having a lower thermal conductivity than a system material has a higher cutting temperature, and it is necessary to conduct a large amount of heat to the chips in high-speed rotation and high-speed feed processing. Therefore, the inventors control the thickness and size of the chips to be large and small, for example, control the thickness and size of the chips near the nose, and increase the heat capacity of the chips near the nose to increase the heat capacity of the chips. The inventors have come to the knowledge that heat can be effectively conducted and cutting heat can be easily removed to improve cutting performance, cutting edge life and cutting accuracy.

本発明はこのような不都合を解決することを目的とするもので、本発明のうちで、請求項１記載の発明にあっては、少なくとも本体の先端球面部に被加工物を切削する複数の切刃を備えてなり、上記切刃を、ノーズに達する単数又は複数の主切刃と、該ノーズとの間に無刃離隔部を存して該ノーズに達しない単数又は複数の副切刃とで構成し、該無刃離隔部の大きさを大小に設定し、該無刃離隔部の大きさの大小設定により上記切刃による切り屑の大きさを大小に定めて上記被加工物の切削により発生する切削熱が切り屑に効果的に伝導するようにしたことを特徴とするボールエンドミルにある。   The present invention aims to solve such inconveniences. Among the present inventions, in the invention according to claim 1, a plurality of workpieces are cut at least on the tip spherical surface of the main body. One or a plurality of sub-cutting blades that are provided with a cutting blade, and that do not reach the nose due to a single or plural main cutting blades that reach the nose and a no-blade separation portion between the nose And the size of the blade-free separation portion is set to be large or small, and the size of the cutting edge by the cutting blade is determined to be large or small by setting the size of the blade-free separation portion. A ball end mill characterized in that cutting heat generated by cutting is effectively conducted to chips.

又、請求項２記載の発明は、上記副切刃を上記無刃離隔部に滑らかに移行するため、該移行部分を円弧の一部により形成してなることを特徴とするものであり、又、請求項３記載の発明にあっては、上記副切刃を上記無刃離隔部に滑らかに移行するため、該副切刃を円弧半径の異なる複数の円弧の一部により形成してなることを特徴とするものであり、又、請求項４記載の発明は、上記副切刃を上記無刃離隔部に滑らかに移行するため、該副切刃を楕円の一部により形成してなることを特徴とするものであり、又、請求項５記載の発明は、上記副切刃が複数の場合において、各副切刃と各無刃離隔部との間の離隔寸法がそれぞれ異なる寸法に設定されていることを特徴とするものである。   The invention according to claim 2 is characterized in that the transition part is formed by a part of an arc in order to smoothly transition the auxiliary cutting edge to the no-blade separation part. In the invention of claim 3, the secondary cutting edge is formed by a part of a plurality of circular arcs having different arc radii in order to smoothly transfer the secondary cutting edge to the bladeless separation portion. The invention according to claim 4 is characterized in that the secondary cutting edge is formed by a part of an ellipse in order to smoothly transfer the secondary cutting edge to the no-blade separation portion. In the invention according to claim 5, when there are a plurality of the above-mentioned sub-cutting blades, the separation dimension between each sub-cutting blade and each non-blade separation portion is set to a different dimension. It is characterized by being.

本発明は上述の如く、請求項１記載の発明にあっては、エンドミルの本体の先端球面部に形成されている被加工物を切削する複数の切刃は、ノーズに達する単数又は複数の主切刃と、ノーズとの間に無刃離隔部を存してノーズに達しない単数又は複数の副切刃とで構成され、ノーズに対する副切刃の無刃離隔部の大きさを大小に設定し、この無刃離隔部の大きさの大小設定により切刃による切り屑の大きさを大小に定めるように構成しているから、主切刃により切り屑が生成されると共に複数の副切刃により切り屑が生成され、主切刃及び副切刃からなる切刃により無刃離隔部の大きさの大小設定により定められた大きさの切り屑が生成除去されることになり、切り屑が大小に定められることにより切り屑の熱容量を制御することができ、それだけ、切削部位などに応じた熱容量の切り屑を生成除去することができ、被加工物の切削により発生する切削熱を切り屑に効果的に伝導することができ、本体及び被加工物に存在する切削熱を切り屑により効果的に除去することができ、切削性や切刃寿命、切削精度の向上を図ることができる。   As described above, according to the present invention, the plurality of cutting blades for cutting the workpiece formed on the spherical surface at the tip end of the main body of the end mill have one or a plurality of main blades that reach the nose. Consists of one or more secondary cutting edges that do not reach the nose with a no-blade separation part between the cutting edge and the nose. In addition, since the size of the chip by the cutting blade is determined to be large or small by setting the size of the no-blade separation portion, the main cutting blade generates chips and a plurality of sub cutting blades. As a result, a chip having a size determined by the size setting of the no-blade separation portion is generated and removed by the cutting blade composed of the main cutting edge and the auxiliary cutting edge. It is possible to control the heat capacity of the chips by determining the size. It is possible to generate and remove chips with a heat capacity according to the cutting part, etc., and to effectively transmit the cutting heat generated by cutting the workpiece to the chips and present in the main body and the workpiece. The cutting heat to be removed can be effectively removed by the chips, and the cutting performance, cutting edge life, and cutting accuracy can be improved.

又、請求項２記載の発明にあっては、上記副切刃を上記無刃離隔部に滑らかに移行するため、該移行部分を円弧の一部により形成してなるから、急激な切削抵抗の変化を抑制することができ、当該部位による切刃の局所的な摩耗や摩損、欠損を抑制することができ、又、請求項３記載の発明にあっては、上記副切刃を上記無刃離隔部に滑らかに移行するため、副切刃を円弧半径の異なる複数の円弧の一部により形成しているから、任意形状の切り屑を生成することができ、急激な切削抵抗の変化を抑制することができ、当該部位による切刃の局所的な摩耗や摩損、欠損を抑制することができ、又、請求項４記載の発明にあっては、上記副切刃を上記無刃離隔部に滑らかに移行するため、該副切刃を楕円の一部により形成しているから、任意形状の切り屑を生成することができ、急激な切削抵抗の変化を抑制することができ、当該部位による切刃の局所的な摩耗や摩損、欠損を抑制することができ、又、請求項５記載の発明にあっては、上記副切刃が複数の場合において、各副切刃と各無刃離隔部との間の離隔寸法がそれぞれ異なる寸法に設定されているから、主切刃及び副切刃により無刃離隔部の大きさの大小設定により定められた大きさの切り屑が生成除去されることになり、それだけ、切り屑の大小を細かに定めることができ、熱容量の異なる切り屑を細かに定めることができ、切り屑の熱容量を精度良く制御することができ、切削部位などに応じた適切に対応した熱容量の切り屑を生成除去することができ、被加工物の切削により発生する切削熱を切り屑に効果的に伝導することができ、本体Ｅ及び被加工物Ｗへの切削熱の蓄積を抑制することができ、切削性や切刃寿命、切削精度の向上を図ることができる。   Further, in the invention according to claim 2, since the auxiliary cutting edge is smoothly transferred to the blade-less separation portion, the transition portion is formed by a part of an arc, so that a sharp cutting resistance is obtained. Change can be suppressed, and local wear, abrasion, and chipping of the cutting edge due to the part can be suppressed, and in the invention according to claim 3, the auxiliary cutting edge is replaced with the non-blading edge. Since the secondary cutting edge is formed by a part of multiple arcs with different arc radii for smooth transition to the separation part, it is possible to generate chips of any shape and suppress rapid changes in cutting resistance It is possible to suppress local abrasion, abrasion, and chipping of the cutting edge due to the part, and in the invention according to claim 4, the auxiliary cutting edge is used as the no-blade separation portion. Since the secondary cutting edge is formed by a part of an ellipse for smooth transition, an arbitrary shape 6 can be generated, a rapid change in cutting resistance can be suppressed, and local wear, abrasion, and chipping of the cutting edge due to the part can be suppressed. In this invention, when there are a plurality of sub cutting edges, the separation dimensions between the sub cutting edges and the non-blade separating portions are set to different dimensions. The blade will generate and remove chips of a size determined by the size setting of the bladeless separation part, so that the size of the chips can be determined finely, and chips with different heat capacities can be removed. It can be finely defined, the heat capacity of the chips can be controlled with high precision, the chips with the heat capacity appropriately corresponding to the cutting site etc. can be generated and removed, and generated by cutting the workpiece Effectively conducts cutting heat to chips Bets can be, it is possible to suppress the accumulation of cutting heat to body E and the workpiece W, it is possible to reduce cutting resistance and cutting life, the improvement of the cutting accuracy.

本発明の実施の第一形態例の全体斜視図である。1 is an overall perspective view of a first embodiment of the present invention. 本発明の実施の第一形態例の先端正面図である。It is a front end view of the first embodiment of the present invention. 本発明の実施の第一形態例の縦断面図である。It is a longitudinal cross-sectional view of the first embodiment of the present invention. 本発明の実施の第一形態例の説明縦断面図である。It is a description longitudinal cross-sectional view of the example of 1st Embodiment of this invention. 本発明の実施の第一形態例の切り屑の説明断面斜視図である。It is an explanation section perspective view of the chip of the example of the 1st embodiment of the present invention. 本発明の実施の第一形態例の切り屑の説明斜視図である。It is a description perspective view of the chip of the first embodiment of the present invention. 本発明の実施の第二形態例の先端正面図である。It is a front end view of the second embodiment of the present invention. 本発明の実施の第二形態例の説明縦断面図である。It is a description longitudinal cross-sectional view of the 2nd embodiment of this invention. 本発明の実施の第二形態例の切り屑の斜視図である。It is a perspective view of the chip of the 2nd example of an embodiment of the invention. 本発明の実施の第三形態例の先端正面図である。It is a front end view of the third embodiment of the present invention. 本発明の実施の第三形態例の説明縦断面図である。It is a description longitudinal cross-sectional view of the 3rd embodiment of this invention. 本発明の実施の第三形態例の切り屑の斜視図である。It is a perspective view of the chip of the third embodiment of the present invention. 本発明の実施の第四形態例の先端正面図である。It is a tip front view of the 4th example of an embodiment of the invention. 本発明の実施の第四形態例の説明縦断面図である。It is a description longitudinal cross-sectional view of the 4th example of embodiment of this invention. 本発明の実施の第四形態例の切り屑の斜視図である。It is a perspective view of the chip of the 4th example of an embodiment of the invention.

図１乃至図１５は本発明の実施の形態例を示し、図１乃至図６は第一形態例、図７乃至図９は第二形態例、図１０乃至図１２は第三形態例、図１３乃至図１５は第四形態例である。   1 to 15 show an embodiment of the present invention, FIGS. 1 to 6 show a first embodiment, FIGS. 7 to 9 show a second embodiment, FIGS. 10 to 12 show a third embodiment, FIG. 13 to 15 show a fourth embodiment.

図１乃至図６の第一形態例において、Ｅはエンドミルの本体であって、この本体Ｅの先端球面部には被加工物Ｗを切削する複数の切刃Ｋが形成されており、この切刃Ｋは、先端回転中心たるノーズＮに達する単数又は複数、この場合、２個の主切刃Ｓと、ノーズＮとの間に無刃離隔部Ｍを存してノーズＮに達しない単数又は複数、この場合、上記２個の各主切刃Ｓにつき、回転方向に２個ずつ、計４個の副切刃Ｆとで構成し、無刃離隔部Ｍの大きさを大小に設定し、無刃離隔部Ｍの大きさの大小設定により切刃Ｓ・Ｆによる切り屑Ｈの大きさを大小に定めるように構成している。   In the first embodiment shown in FIGS. 1 to 6, E is a main body of an end mill, and a plurality of cutting edges K for cutting the workpiece W are formed on the tip spherical surface of the main body E. The blade K is a single or plural blades that reach the nose N that is the tip rotation center. In this case, the blade K is a single blade that does not reach the nose N due to the no-blade separation portion M between the two main cutting blades S and the nose N. Plural, in this case, each of the two main cutting edges S is composed of two auxiliary cutting edges F, two in the rotational direction, and the size of the blade-free separation part M is set to be large or small. The size of the chip H by the cutting blades S and F is determined to be large or small by setting the size of the bladeless separation part M.

この場合、上記副切刃Ｆが複数、この場合２個ずつとなっており、この２個ずつの各副切刃Ｆ1・Ｆ2と各無刃離隔部Ｍ・Ｍとの間の離隔寸法Ｇをそれぞれ異なる寸法Ｇ1・Ｇ2に設定している。 In this case, there are a plurality of secondary cutting edges F, two each in this case, and the separation dimension between each of the two secondary cutting edges F 1 and F 2 and each bladeless separation portion M and M. G is set to different dimensions G 1 and G 2 , respectively.

この実施の第一形態例は上記構成であるから、エンドミルの本体Ｅの先端球面部に形成されている被加工物Ｗを切削する複数の切刃Ｋは、ノーズＮに達する単数又は複数、この場合、２個の主切刃Ｓと、ノーズＮとの間に無刃離隔部Ｍを存してノーズＮに達しない単数又は複数、この場合、上記２個の各主切刃Ｓにつき、回転方向に２個ずつ、計４個の副切刃Ｆとで構成され、ノーズＮに対する副切刃Ｆ・Ｆの無刃離隔部Ｍの大きさを大小に設定し、この無刃離隔部Ｍの大きさの大小設定により切刃Ｓ・Ｆによる切り屑Ｈの大きさを大小に定めるように構成しているから、図４、図５、図６の如く、主切刃Ｓにより切り屑ＨSが生成されると共に二個ずつの副切刃Ｆにより切り屑ＨFが生成され、主切刃Ｓ及び副切刃Ｆからなる切刃Ｓ・Ｆにより無刃離隔部Ｍの大きさの大小設定により定められた大きさの切り屑Ｈが生成除去されることになり、切り屑Ｈが大小に定められることにより切り屑Ｈの熱容量を制御することができ、それだけ、切削部位などに応じた熱容量の切り屑Ｈｓ・ＨFを生成除去することができ、被加工物Ｗの切削により発生する切削熱を切り屑Ｈに効果的に伝導することができ、本体Ｅ及び被加工物Ｗへの切削熱の蓄積を抑制することができ、切削性や切刃寿命、切削精度の向上を図ることができる。 Since the first embodiment of the present embodiment has the above-described configuration, the plurality of cutting blades K for cutting the workpiece W formed on the spherical end portion of the main body E of the end mill have one or more cutting edges K reaching the nose N. In this case, one or a plurality of the main cutting blades S and the nose N do not reach the nose N due to the no-blade separation portion M between them. In this case, the two main cutting blades S are rotated. It is composed of four sub cutting edges F, two in each direction, and the size of the no-blade separation portion M of the sub-cutting blades F and F with respect to the nose N is set to be large and small. because configured to determine the size of the chip H by cutting S · F in magnitude depending on the size of the large and small settings, 4, 5, as shown in FIG. 6, scrap H S cut by the main cutting edge S There debris H F cut by the minor cutting edge F of each two together is generated is produced, the cutting edge S · F consisting of the main cutting edge S and the auxiliary cutting edge F The chip H having a size determined by the size setting of the bladeless separation part M is generated and removed, and the heat capacity of the chip H is controlled by the chip H being determined to be large and small. can be, it only can produce chip removing Hs · H F of heat capacity depending on the cutting site, it is effectively conducted to the scrap H cut cutting heat generated by the cutting of the workpiece W It is possible to suppress the accumulation of cutting heat on the main body E and the workpiece W, and it is possible to improve the machinability, the cutting edge life, and the cutting accuracy.

この場合、上記副切刃Ｆが２個となっていて、各副切刃Ｆ1・Ｆ2と各無刃離隔部Ｍ・Ｍとの間の離隔寸法Ｇをそれぞれ異なる寸法に設定しているから、図４、図５、図６の如く、主切刃Ｓにより切り屑ＨSが生成されると共に二個ずつの副切刃Ｆ1・Ｆ2により大きさの異なる切り屑ＨF1・ＨF2が生成され、主切刃Ｓ及び副切刃Ｆ1・Ｆ2からなる切刃Ｓ・Ｆ1・Ｆ2により無刃離隔部Ｍの大きさの大小設定により定められた大きさの切り屑Ｈｓ・ＨF1・ＨF2が生成除去されることになり、それだけ、切り屑Ｈの大小を細かに定めることができ、熱容量の異なる切り屑Ｈを細かに定めることができ、切り屑Ｈの熱容量を精度良く制御することができ、切削部位などに応じて適切に対応した熱容量の切り屑Ｈｓ・ＨFを生成除去することができ、被加工物Ｗの切削により発生する切削熱を切り屑に効果的に伝導することができ、本体Ｅ及び被加工物Ｗへの切削熱の蓄積を抑制することができ、切削性や切刃寿命、切削精度の向上を図ることができる。 In this case, there are two sub-cutting blades F, and the separation dimensions G between the sub-cutting blades F 1 and F 2 and the bladeless separation portions M and M are set to different dimensions. 4, 5, and 6, chips H S are generated by the main cutting edge S, and chips H F1 and H having different sizes by the two auxiliary cutting edges F 1 and F 2. F2 is generated, chips of the main cutting edge S and the auxiliary cutting edge F 1 · F 2 consisting of the cutting edge S · F 1 · F 2 by the size defined by the size setting of the size of the free edge spaced portion M of Hs, H F1 and H F2 are generated and removed, and accordingly, the size of the chip H can be determined finely, the chips H having different heat capacities can be determined finely, and the heat capacity of the chips H accurately can be controlled, it is possible to generate chip removing Hs · H F properly the corresponding heat capacity depending on the cutting site, the Cutting heat generated by the cutting of the workpiece W can be effectively conducted to the chips, accumulation of cutting heat on the main body E and the workpiece W can be suppressed, cutting performance and cutting edge life, The cutting accuracy can be improved.

図７乃至図９の第二形態例は別例構造を示し、この場合、上記副切刃Ｆを上記無刃離隔部Ｍに滑らかに移行するため、円弧半径Ｒの副切刃Ｆから無刃離隔部Ｍに至る移行部分を半径ｒの円弧ｃの一部により形成している。   The second embodiment shown in FIGS. 7 to 9 shows another structure. In this case, in order to smoothly move the secondary cutting edge F to the bladeless separation portion M, the secondary cutting edge F is moved from the secondary cutting edge F having the arc radius R to the bladeless. A transition portion reaching the separation portion M is formed by a part of the arc c having the radius r.

この実施の第二形態例は上記構成であるから、上記第一形態例と同様な作用効果を得ることができると共に、副切刃Ｆから無刃離隔部Ｍへの移行部分を半径ｒの円弧ｃの一部によって滑らかに移行するように形成しているから、急激な切削抵抗の変化を抑制することができ、当該部位による切刃Ｋの局所的な摩耗や摩損、欠損を抑制することができる。   Since the second embodiment of the present embodiment has the above-described configuration, it is possible to obtain the same operational effects as the first embodiment, and the transition portion from the secondary cutting edge F to the bladeless separation portion M is an arc having a radius r. Since it is formed so as to be smoothly shifted by a part of c, it is possible to suppress a rapid change in cutting resistance, and to suppress local wear, abrasion, and chipping of the cutting edge K due to the part. it can.

図１０乃至図１２の第三形態例は別例構造を示し、この場合、上記副切刃Ｆを上記無刃離隔部Ｍに滑らかに移行するため、副切刃Ｆを円弧半径Ｒｎ（ｎ＝１，２，３・・・）の異なる複数の円弧Ｃｎ（ｎ＝１，２，３・・・）の一部により形成している。   The third embodiment shown in FIGS. 10 to 12 shows another example structure. In this case, in order to smoothly move the secondary cutting edge F to the bladeless separation part M, the secondary cutting edge F has an arc radius Rn (n = Are formed by a part of a plurality of arcs Cn (n = 1, 2, 3...) Having different numbers.

この実施の第三形態例は上記構成であるから、上記第一形態例と同様な作用効果を得ることができると共に、副切刃Ｆを円弧半径Ｒｎ（ｎ＝１，２，３・・・）の異なる複数の円弧Ｃｎ（ｎ＝１，２，３・・・）の一部により形成しているから、任意形状の切り屑Ｈを生成することができ、急激な切削抵抗の変化を抑制することができ、当該部位による切刃Ｋの局所的な摩耗や摩損、欠損を抑制することができる。   Since the third embodiment of the present embodiment has the above-described configuration, the same operational effects as the first embodiment can be obtained, and the secondary cutting edge F can be provided with an arc radius Rn (n = 1, 2, 3,... ) Having different arcs Cn (n = 1, 2, 3,...), It is possible to generate chips H having an arbitrary shape, and suppress rapid changes in cutting resistance. It is possible to suppress local wear, abrasion and chipping of the cutting edge K caused by the part.

図１３乃至図１５の第四形態例は別例構造を示し、この場合、上記副切刃Ｆを上記無刃離隔部Ｍに滑らかに移行するため、該副切刃Ｆを楕円Ｄｎ（ｎ＝１，２，３・・・）の一部により形成している。   The fourth embodiment shown in FIGS. 13 to 15 shows another structure. In this case, in order to smoothly move the secondary cutting edge F to the no-blade separation portion M, the secondary cutting edge F is formed into an ellipse Dn (n = 1, 2, 3 ...).

この実施の第四形態例は上記構成であるから、上記第一形態例と同様な作用効果を得ることができると共に、該副切刃Ｆを楕円Ｄｎ（ｎ＝１，２，３・・・）の一部により形成しているから、任意形状の切り屑Ｈを生成することができ、急激な切削抵抗の変化を抑制することができ、当該部位による切刃Ｋの局所的な摩耗や摩損、欠損を抑制することができる。   Since the fourth embodiment of the present embodiment has the above-described configuration, it is possible to obtain the same operational effects as the first embodiment, and the auxiliary cutting edge F is formed into an ellipse Dn (n = 1, 2, 3,... ), It is possible to generate chips H having an arbitrary shape, to suppress a rapid change in cutting resistance, and to cause local wear and wear of the cutting edge K by the part. , Deficiency can be suppressed.

尚、本発明は上記の形態例に限られるものではなく、例えば、主切刃Ｓを１個、副切刃Ｆを２個の計３個の切刃としたり、その他、主切刃Ｓ、副切刃Ｆの数、すくい角、各刃のなす角、ねじれ角などの刃の形状、無刃離隔部の大きさや形態などは適宜変更して設計される。   Note that the present invention is not limited to the above-described embodiments. For example, the main cutting edge S has one cutting edge and the sub cutting edge F has two cutting edges, or a main cutting edge S, The number of sub-cutting blades F, the rake angle, the angle formed by each blade, the shape of the blade such as the torsion angle, and the size and form of the bladeless separation portion are appropriately changed and designed.

以上の如く、所期の目的を充分達成することができる。   As described above, the intended purpose can be sufficiently achieved.

Ｅ 本体
Ｗ 被加工物
Ｋ 切刃
Ｎ ノーズ
Ｓ 主切刃
Ｍ 無刃離隔部
Ｆ 副切刃
Ｈ 切り屑
Ｇ 離隔寸法
Ｃ 円弧
Ｄ 楕円
Ｒ 円弧半径
ｒ 半径
E Body W Workpiece K Cutting edge N Nose S Main cutting edge M No-blade separation part F Secondary cutting edge H Chip G Separation dimension C Arc D Ellipse R Arc radius r Radius

Claims (5)

少なくとも本体の先端球面部に被加工物を切削する複数の切刃を備えてなり、上記切刃を、ノーズに達する単数又は複数の主切刃と、該ノーズとの間に無刃離隔部を存して該ノーズに達しない単数又は複数の副切刃とで構成し、該無刃離隔部の大きさを大小に設定し、該無刃離隔部の大きさの大小設定により上記切刃による切り屑の大きさを大小に定めて上記被加工物の切削により発生する切削熱が切り屑に効果的に伝導するようにしたことを特徴とするボールエンドミル。   A plurality of cutting blades for cutting a workpiece are provided at least at the tip spherical surface of the main body, and the cutting blade includes a single or a plurality of main cutting blades reaching the nose and a no-blade separating portion between the nose. It is composed of one or a plurality of secondary cutting blades that do not reach the nose, and the size of the bladeless separation portion is set to be large or small, and the size of the bladeless separation portion is set according to the size of the cutting blade. A ball end mill characterized in that the size of a chip is determined to be large and small so that cutting heat generated by cutting the workpiece is effectively conducted to the chip. 上記副切刃を上記無刃離隔部に滑らかに移行するため、該移行部分を円弧の一部により形成してなることを特徴とする請求項１記載のボールエンドミル。   2. The ball end mill according to claim 1, wherein the transition portion is formed by a part of an arc in order to smoothly transition the sub-cutting blade to the bladeless separation portion. 上記副切刃を上記無刃離隔部に滑らかに移行するため、該副切刃を円弧半径の異なる複数の円弧の一部により形成してなることを特徴とする請求項１記載のボールエンドミル。   2. The ball end mill according to claim 1, wherein the secondary cutting edge is formed by a part of a plurality of arcs having different arc radii in order to smoothly move the secondary cutting edge to the blade-free separation portion. 上記副切刃を上記無刃離隔部に滑らかに移行するため、該副切刃を楕円の一部により形成してなることを特徴とする請求項１記載のボールエンドミル。   2. The ball end mill according to claim 1, wherein the secondary cutting edge is formed by a part of an ellipse in order to smoothly move the secondary cutting edge to the non-blade separation portion. 上記副切刃が複数の場合において、各副切刃と各無刃離隔部との間の離隔寸法がそれぞれ異なる寸法に設定されていることを特徴とする請求項１〜４のいずれか１項に記載のボールエンドミル。
The said 1st cutting edge WHEREIN: The separation dimension between each secondary cutting edge and each no-blade separation part is set to the dimension from which each differs, The said any one of Claims 1-4 characterized by the above-mentioned. Ball end mill as described in
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717137A (en) * 2012-06-15 2012-10-10 常州液压成套设备厂有限公司 Ball-end milling cutter applicable to machining high-temperature alloy materials
JP2014042981A (en) * 2012-08-01 2014-03-13 Hitachi Tool Engineering Ltd Tooth point replaceable ball end mill
JP2018051673A (en) * 2016-09-28 2018-04-05 三菱日立ツール株式会社 Ball end mill
CN109262039A (en) * 2018-10-29 2019-01-25 株洲钻石切削刀具股份有限公司 A kind of multi-functional imitating milling cutter

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Publication number Priority date Publication date Assignee Title
JPS5718919U (en) * 1980-07-07 1982-01-30
JPH06155126A (en) * 1992-11-27 1994-06-03 Honda Motor Co Ltd Ball end mill

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5718919U (en) * 1980-07-07 1982-01-30
JPH06155126A (en) * 1992-11-27 1994-06-03 Honda Motor Co Ltd Ball end mill

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102717137A (en) * 2012-06-15 2012-10-10 常州液压成套设备厂有限公司 Ball-end milling cutter applicable to machining high-temperature alloy materials
JP2014042981A (en) * 2012-08-01 2014-03-13 Hitachi Tool Engineering Ltd Tooth point replaceable ball end mill
JP2018051673A (en) * 2016-09-28 2018-04-05 三菱日立ツール株式会社 Ball end mill
CN109262039A (en) * 2018-10-29 2019-01-25 株洲钻石切削刀具股份有限公司 A kind of multi-functional imitating milling cutter
CN109262039B (en) * 2018-10-29 2020-10-16 株洲钻石切削刀具股份有限公司 Multifunctional profile milling cutter

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