JP4184677B2 - Throw-away tip for ball end mill - Google Patents

Throw-away tip for ball end mill Download PDF

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Publication number
JP4184677B2
JP4184677B2 JP2002047084A JP2002047084A JP4184677B2 JP 4184677 B2 JP4184677 B2 JP 4184677B2 JP 2002047084 A JP2002047084 A JP 2002047084A JP 2002047084 A JP2002047084 A JP 2002047084A JP 4184677 B2 JP4184677 B2 JP 4184677B2
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Japan
Prior art keywords
arc
cutting edge
chip
end mill
shaped cutting
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JP2003245816A (en
Inventor
卓洋 山下
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Kyocera Corp
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Kyocera Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B23C5/1009—Ball nose end mills
    • B23C5/1027—Ball nose end mills with one or more removable cutting inserts
    • B23C5/1045—Ball nose end mills with one or more removable cutting inserts having a cutting insert, the cutting edge of which subtends substantially 90 degrees
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/16—Milling-cutters characterised by physical features other than shape
    • B23C5/20—Milling-cutters characterised by physical features other than shape with removable cutter bits or teeth or cutting inserts
    • B23C5/22—Securing arrangements for bits or teeth or cutting inserts
    • B23C5/2204—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert
    • B23C5/2208—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts 
    • B23C5/2213—Securing arrangements for bits or teeth or cutting inserts with cutting inserts clamped against the walls of the recess in the cutter body by a clamping member acting upon the wall of a hole in the insert for plate-like cutting inserts  having a special shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/12—Side or flank surfaces
    • B23C2200/123—Side or flank surfaces curved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/201—Details of the nose radius and immediately surrounding areas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/20—Top or side views of the cutting edge
    • B23C2200/203—Curved cutting edges

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、ボールエンドミル本体の先端に着脱自在に装着される、円弧状の切刃を有するボールエンドミル用スローアウェイチップに関する。
【０００２】
【従来の技術】
スローアウェイチップを用いたボールエンドミルとしては、例えば、図１２から図１４に示すように、略円柱状のボールエンドミル本体３２の先端に、この軸線１０を挟んで互いに反対側に、軸線方向先端側から見てＬ字型に切り欠かれるようにして一対の溝１１が形成され、これら溝１１のエンドミル回転方向側を向く壁面に形成されたチップ取付座に、それぞれスローアウェイチップ２１、２１ａがクランプネジによって着脱自在に装着された構成のものが知られている。
【０００３】
このうち、軸線１０を越える範囲をカバーするスローアウェイチップ２１は、板状をなし、両側面の上縁部に１／４円弧状切刃２６と、これに対向する上面視で直線状の対向辺稜２７と、これら１／４円弧状切刃２６と対向辺稜２７とが交わる部分にノーズ２８が形成されたものであった。また、このスローアウェイチップ２１は、上面のノーズ２８側端部に、前記上面の中央側からノーズ２８側に向かうに従い、着座面２３とされる下面に漸次近づく凸曲面２５が形成されたものであった。なお、このスローアウェイチップ２１において、側面の形状はスムーズ２４であり、特に、膨出部は形成されていなかった。
【０００４】
上記従来チップによれば、切削時に先ず凸状切刃が被削材に喰い付き、次いでエンドミル本体３２の回転に伴って漸次、１／４円弧状切刃２６の全体が切削を行う様になるため、衝撃的な切削荷重が作用することがないといった利点が得られる。
【０００５】
【発明が解決しようとする課題】
しかし、前記従来チップでは、上面視において、１／４円弧状切刃２６の凸曲面２５に沿った部分が、他の部分がなす円弧よりも内方となる。そのため、チップの側面２４の下辺稜部が被削材と干渉し易くなる。そして、この干渉によりチップにビビリが発生して、刃先欠損を引き起こしたり、異常摩耗を引き起こすなどで、加工不良となったり、チップの寿命を短くしてしまうなどの問題があった。
【０００６】
また、前記凸曲面２５は最先端が先方に尖った形状となるので、この部分の刃先強度が大きくなかった。
【０００７】
本発明はこのような従来技術の問題に鑑み、チップの側面の下辺稜部が被削材と干渉し難くすることで、チップにビビリが発生させたり、刃先欠損を引き起こしたり、異常摩耗を引き起こしたりし難くし、これにより、加工不良を防止し、且つ、チップを長寿命とすることが可能なボールスローアウェイチップを提供することを課題とする。
【０００８】
【課題を解決するための手段】
上記課題を解決するため請求項１のボールエンドミル用スローアウェイチップは、板状をなし、すくい面とされる上面と側面との稜線部に、１／４円弧状切刃と、これに対向する対向辺稜と、これら１／４円弧状切刃と対向辺稜とが交わる部分にノーズと、を形成してなるポジタイプのボールエンドミル用スローアウェイチップであって、前記ノーズに隣接して、前記上面の中央側から前記ノーズに向かうに従い、着座面とされる下面に漸次近づく傾斜平坦面が形成され、且つ、前記１／４円弧状切刃が、前記傾斜平坦面と側面との稜線部に位置する部分を含む切刃の全長に渡って前記チップの上面視で同一円弧となるように、前記１／４円弧状切刃に沿う側面のうち前記傾斜平坦面と側面との稜線部に沿った側面部分を、他の側面部分よりも外方に膨出させたことを特徴とする。
【０００９】
かかる構成によれば、前記１／４円弧状切刃がチップの上面視で同一円弧となることから、チップの側面の下辺稜部が被削材と干渉しにくくなる。したがって、チップにビビリが発生させたり、刃先欠損を引き起こしたり、異常摩耗を引き起こしたりし難いので、加工不良となったり、チップの寿命を短くしてしまうなどの問題を防止することができる。
【００１０】
また、ノーズ側の最先端が傾斜平坦面であり、凸曲面のように最先端が尖っていないので、この部分の刃先強度が大きい。
【００１１】
これに加えて前記構成によれば、前記傾斜平坦面に沿った部分を含めて、１／４円弧状切刃がチップの上面視で同一円弧となることから、被削材の切削部分において底形状が正確な円弧状となるので、仕上げ加工が必要な場合であっても、加工が非常に容易に済む。
【００１２】
また、請求項２のボールエンドミル用スローアウェイチップは、前記チップの上面視において、前記１／４円弧状切刃のうち前記傾斜平坦面と側面との稜線部に位置する部分の長さが、前記１／４円弧状切刃の全長の１／９〜１／７であることを特徴とする。
【００１３】
かかる構成によれば、切削抵抗が小さく、且つ切刃強度を大きく保つことができる。
【００１４】
すなわち、上記傾斜平坦面を小さくすることで（前記比が１／７以下）、負のすくい角のすくい面領域が小さくして、切削抵抗を減少させるとともに、上面視において、前記１／４円弧状切刃における傾斜平坦面に沿った部分を、その他の部分と同じ円弧にするための、側面における膨出量を小さくすることで、この部分の切刃強度を大きく保つことができる。なお、上記傾斜平坦面を過小にした場合（前記比が１／９未満）、切削抵抗を減少させる作用が不十分となる恐れがある。
【００１５】
【発明の実施の形態】
以下、この発明の実施形態に係るチップを添付図面に基づいて具体的に説明する。
【００１６】
図１乃至図１１に、本発明の実施形態の一例を示す。
【００１７】
このうち、図１乃至図３は、本発明のスローアウェイチップ（以下、チップと略称する）１を示す。
【００１８】
このチップ１は、超硬合金等の硬質材料から平面形状が略楕円形状の平板状に形成され、すくい面２とされる上面と側面４との稜線部に、１／４円弧状切刃６と、これに対向する対向辺稜７と、これら１／４円弧状切刃６と対向辺稜７とが交わる部分にノーズ８とを形成してなるポジタイプのチップである。
【００１９】
また、前記チップ１は、前記ノーズ８に隣接して、前記すくい面２の中央側からノーズ８側に向かうに従い、着座面３とされる下面に近づく傾斜平坦面５が形成され、ノーズ８部分の強度を向上させた構成となっている。
【００２０】
この傾斜平坦面５における、前記すくい面２の中央側の辺稜部にはフラットランド９が形成され、その内側は正のすくい面２となっている。
【００２１】
前記１／４円弧状切刃６は、チップ１の上面視において、その全長が同一円弧となるよう構成される。そのため、前記傾斜平坦面５に沿った側面１３は、外方に膨出している（図３における膨出部５ａ）。
【００２２】
次に、図４乃至図６は、前記本発明のチップ１とともに後述のボールエンドミル本体に装着するチップ１ａを示す。
【００２３】
前記チップ１と比べて、このチップ１ａは一方側のノーズ８と他方側のノーズ８との間隔が大きく、前記対向辺稜７が長いことを特徴とする。それ以外、１／４円弧状切刃６と、これに対向する対向辺稜７と、これら１／４円弧状切刃６と対向辺稜７とが交わる部分にノーズ８とを形成してなるポジタイプのチップ１であること、また、前記すくい面２においてノーズ８に隣接して、前記すくい面２の中央側からノーズ８側に向かうに従い、着座面３とされる下面に近づく傾斜平坦面５が形成され、ノーズ８部分の強度を向上させた構成である点で、前記チップ１と共通した構成となっている。
【００２４】
これらチップ１、１ａは、図７乃至図９に示すボールエンドミル本体１２に装着される。以下、この点について説明する。
【００２５】
略半球状の先端部を備えた略円柱状のボールエンドミル本体１２の先端に、その軸線１０を挟んで互いに反対側に軸線方向先端側から見て図７に示すようにＬ字型に切り欠かれるようにして一対の溝１１，１１が形成され、これら溝１１，１１のエンドミル回転方向側を向く壁面に形成されたチップ取付座に、クランプネジによって、前記チップ１、１ａがそれぞれ着脱自在に装着され、チップ１の１／４円弧状切刃６が切削に関与するように配置されている。そして、一方のチップ１は、前記軸線１０を越えて配置される、他方のチップ１ａは前記軸線１０を越えない配置となっている。なお、チップ１は正の軸線方向すくい角でもってボールエンドミル工具本体に装着される。
【００２６】
前記チップ１，１ａを用い、このように構成されるボールエンドミルによれば、図１１に示すように、前記１／４円弧状切刃６がチップ１の上面視で同一円弧となることから、図１０に示すように、チップ１の側面４の下辺稜部が被削材と干渉しにくくなる。したがって、チップ１にビビリが発生させたり、刃先欠損を引き起こしたり、異常摩耗を引き起こしたりし難いので、加工不良となったり、チップ１の寿命を短くしてしまうなどの問題を防止することができる。
【００２７】
因みに、図１１において符号１４'は、従来技術のように前記１／４円弧状切刃６におけるノーズ８の近傍部分が他の部分と同一円弧となるようにしていない場合の、先端側切刃とその延長線を示す。この部分は、同図に示すように、本願発明のチップ１の対応部分１４と比べて内方となってしまう。
【００２８】
これに加えて前記構成によれば、前記傾斜平坦面５に沿った部分を含めて、１／４円弧状切刃６がチップ１の上面視で同一円弧となることから、被削材の切削部分における底形状が正確な円弧状となるので、仕上げ加工が必要な場合であっても、加工が非常に容易に済む。
【００２９】
なお、軸線を越えて配置されるチップ１は、前記チップ１の上面視において、前記１／４円弧状切刃６の全長に対する前記傾斜平坦面５に沿った部分１３の長さの比が１／９〜１／７の長さであることが好ましい。
【００３０】
かかる構成によれば、切削抵抗が小さく、且つ切刃強度を大きく保つことができる。
【００３１】
すなわち、上記傾斜平坦面５を小さくすることで（前記比が１／７以下）、負のすくい角のすくい面領域を小さくして、切削抵抗を減少させるとともに、上面視において、前記１／４円弧状切刃６における傾斜平坦面５に沿った部分１３を、その他の部分と同じ円弧にするための、側面４における膨出量を小さくすることで、この部分の切刃強度を大きく保つことができる。なお、上記傾斜平坦面５を過小にした場合（前記比が１／９未満）、切削抵抗を減少させる作用が不十分となる恐れがある。
【００３２】
以上、本発明の実施形態を図によって例示したが、本発明は上記実施形態に限定されるものではない。本発明は、発明の目的を逸脱しない限り任意の形態とすることができることは云うまでもない。
【００３３】
【発明の効果】
以上のように、本発明のボールエンドミル用スローアウェイチップは、板状をなし、すくい面とされる上面と側面との稜線部に、１／４円弧状切刃と、これに対向する対向辺稜と、これら１／４円弧状切刃と対向辺稜とが交わる部分にノーズとを形成してなるポジタイプのスローアウェイチップであって、前記ノーズに隣接して、前記上面の中央側からノーズ側に向かうに従い、着座面とされる下面に漸次近づく傾斜平坦面が形成され、且つ、前記１／４円弧状切刃が、前記傾斜平坦面と側面との稜線部に位置する部分を含む切刃の全長に渡って前記チップの上面視で同一円弧となるように、前記１／４円弧状切刃に沿う側面のうち前記傾斜平坦面と側面との稜線部に沿った側面部分を、他の側面部分よりも外方に膨出させたことにより、前記１／４円弧状切刃がチップの上面視で同一円弧となる。
【００３４】
したがって、チップの側面の下辺稜部が被削材と干渉しにくくなる。したがって、チップにビビリが発生させたり、刃先欠損を引き起こしたり、異常摩耗を引き起こしたりし難いので、加工不良となったり、チップの寿命を短くしてしまうなどの問題を防止することができる。
【００３５】
また、ノーズ側の最先端が傾斜平坦面であり、凸曲面のように最先端が尖っていないので、この部分の刃先強度が大きい。
これに加えて前記構成によれば、前記傾斜平坦面に沿った部分を含めて、１／４円弧状切刃がチップの上面視で同一円弧となることから、被削材の切削部分において底形状が正確な円弧状となるので、仕上げ加工が必要な場合であっても、加工が非常に容易に済む。
【００３６】
また、前記スローアウェイチップにおいて、前記チップの上面視において、前記１／４円弧状切刃のうち前記傾斜平坦面と側面との稜線部に位置する部分の長さを、前記１／４円弧状切刃の全長の１／９〜１／７とした場合、上記傾斜平坦面を小さくすることで、負のすくい角のすくい面領域が小さくして、切削抵抗を減少させるとともに、上面視において、前記１／４円弧状切刃における傾斜平坦面に沿った部分を、その他の部分と同じ円弧にするための、側面における膨出量を小さくすることで、この部分の切刃強度を大きく保つことができる。
【図面の簡単な説明】
【図１】本発明実施形態のボールエンドミル用スローアウェイチップであって、ボールエンドミルの回転軸を超えた領域の切削を行うチップの正面図（上面図）である。
【図２】図１のチップの右側面図である。
【図３】図１のチップの底面図である。
【図４】図１のチップとともにホルダーに装着するチップの正面図（上面図）である。
【図５】図４のチップの右側面図である。
【図６】図４のチップの底面図である。
【図７】図１のチップと、図４のチップとを装着したボールエンドミルの先端面図である。
【図８】図７のチップの正面図である。
【図９】図７のチップの上面図である。
【図１０】図９の上面図の先端側拡大図である。
【図１１】図８の正面図の先端側拡大図である。
【図１２】従来のボールエンドミル用スローアウェイチップの正面図である。
【図１３】図１２のチップの底面図である。
【図１４】図１１のチップを装着したボールエンドミルの正面図である。
【符号の説明】
１、１ａ （ボールエンドミル用スローアウェイ）チップ
２ すくい面
３ 着座面
４ 側面
５ 傾斜平坦面
５ａ 膨出部
６ １／４円弧状切刃
７ 対向辺稜
８ ノーズ
９ フラットランド
１０ 軸線
１１ 溝
１２ ボールエンドミル本体
１３ 傾斜平坦面に沿った切刃部分[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away tip for a ball end mill having an arcuate cutting edge that is detachably attached to the tip of a ball end mill main body.
[0002]
[Prior art]
As a ball end mill using a throw-away tip, for example, as shown in FIGS. 12 to 14, the tip end of a substantially cylindrical ball end mill main body 32 is opposed to each other across the axis 10, and the tip end in the axial direction. A pair of grooves 11 are formed so as to be cut out in an L shape when viewed from above, and throwaway chips 21 and 21a are clamped on chip mounting seats formed on the wall surfaces of these grooves 11 facing the end mill rotation direction, respectively. The thing of the structure attached so that attachment or detachment with the screw | thread is known.
[0003]
Of these, the throw-away tip 21 that covers the range beyond the axis 10 has a plate-like shape, and has a 1/4 arcuate cutting edge 26 at the upper edge of both side surfaces, and a linearly opposed surface as viewed from above. A nose 28 was formed at a side ridge 27 and a portion where the ¼ arc-shaped cutting edge 26 and the opposite side ridge 27 intersect. The throw-away tip 21 is formed with a convex curved surface 25 that gradually approaches the lower surface, which is the seating surface 23, from the center of the upper surface toward the nose 28 side at the end of the upper surface on the nose 28 side. there were. In this throw-away tip 21, the shape of the side surface is smooth 24, and in particular, the bulging portion was not formed.
[0004]
According to the above-described conventional chip, the convex cutting edge first bites the work material at the time of cutting, and then, as the end mill body 32 rotates, the entire quarter arc-shaped cutting edge 26 gradually cuts. Therefore, an advantage that an impact cutting load does not act can be obtained.
[0005]
[Problems to be solved by the invention]
However, in the conventional chip, in a top view, 1/4 convex surface 2 5 along portions of the arc-shaped cutting edge 26 becomes an inward than the arc formed by the other parts. Therefore, the lower edge ridge portion of the side surface 24 of the tip easily interferes with the work material. This interference causes chattering in the tip, leading to chipping of the blade and abnormal wear, leading to problems such as poor processing and shortening the tip life.
[0006]
Moreover, since the convex curved surface 25 has a shape with a sharp tip at the tip, the edge strength at this portion was not large.
[0007]
In view of such a problem of the prior art, the present invention makes it difficult for the lower edge ridge portion of the side surface of the tip to interfere with the work material, thereby causing chatter on the tip, causing chipping, and causing abnormal wear. It is an object of the present invention to provide a ball throw-away tip that can prevent processing defects and that can extend the life of the tip.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the throw-away tip for a ball end mill according to claim 1 has a plate shape, and a ¼ arc-shaped cutting edge is opposed to a ridge line portion between an upper surface and a side surface which is a rake face. A positive type ball end mill throw-away tip formed by forming an opposing side ridge and a nose at a portion where the ¼ arc-shaped cutting edge and the opposing side ridge intersect, and adjacent to the nose , according from the center side of the upper surface toward the no's, it is gradually approaching the inclined flat surface formed on the lower surface that is seated surface, and the quarter-arc-shaped cutting edge, ridge between the inclined flat face and the side A ridge line portion between the inclined flat surface and the side surface of the side surface along the ¼ arc-shaped cutting blade so as to form the same arc in the top view of the chip over the entire length of the cutting blade including the portion located in the portion a side portion along the, from the other side portion Characterized in that bulged outward.
[0009]
According to such a configuration, the ¼ arc-shaped cutting edge has the same arc as viewed from the top surface of the chip, so that the lower edge ridge portion of the side surface of the chip does not easily interfere with the work material. Therefore, since it is difficult for chatter to occur on the tip, to cause a cutting edge defect, or to cause abnormal wear, it is possible to prevent problems such as processing failure and shortening the life of the tip.
[0010]
In addition, since the leading edge on the nose side is an inclined flat surface and the leading edge is not sharp like a convex curved surface, the strength of the edge of this portion is high.
[0011]
In addition, according to the above configuration, the ¼ arc-shaped cutting edge including the portion along the inclined flat surface has the same arc in the top view of the chip. Since the shape is an accurate arc, even if finishing is necessary, the processing is very easy.
[0012]
Furthermore, indexable ball end mill of claim 2 is the top view of the chip, the length of the portion located ridge portion between the inclined flat face and the side of the quarter-arc-shaped cutting edge, It is 1/9 to 1/7 of the total length of the ¼ arc-shaped cutting blade .
[0013]
According to such a configuration, the cutting resistance is small and the cutting edge strength can be kept large.
[0014]
That is, by reducing the inclined flat surface (the ratio is 1/7 or less), the rake face region having a negative rake angle is reduced to reduce the cutting resistance, and the ¼ circle in top view. By reducing the bulge amount on the side surface in order to make the portion along the inclined flat surface of the arc-shaped cutting blade the same arc as the other portions, the cutting blade strength of this portion can be kept large. If the inclined flat surface is too small (the ratio is less than 1/9), the action of reducing the cutting resistance may be insufficient.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a chip according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings.
[0016]
1 to 11 show an example of the embodiment of the present invention.
[0017]
Among these, FIG. 1 thru | or FIG. 3 shows the throwaway chip | tip (henceforth a chip | tip) 1 of this invention.
[0018]
This chip 1 is formed from a hard material such as cemented carbide in a flat plate shape having a substantially elliptical planar shape, and a ¼ arc-shaped cutting edge 6 is formed on the ridge line portion between the upper surface and the side surface 4 which are the rake face 2. And a positive-type tip formed by forming a nose 8 at a portion where the opposing side ridge 7 facing this, and the 1/4 arcuate cutting edge 6 and the opposing side ridge 7 intersect.
[0019]
Also, the tip 1, the adjacent nose 8, as it goes from the center of the rake face 2 to the nose 8 side, inclined flat surface 5 approaching the lower surface which is seating surface 3 is formed, the nose 8 It is the structure which improved the intensity | strength of the part.
[0020]
A flat land 9 is formed on a side ridge portion of the inclined flat surface 5 on the center side of the rake face 2, and the inner side is a positive rake face 2.
[0021]
The ¼ arc-shaped cutting edge 6 is configured such that its entire length is the same arc when the chip 1 is viewed from above. Therefore, the side surface 13 along the inclined flat surface 5 bulges outward (bulged portion 5a in FIG. 3).
[0022]
Next, FIGS. 4 to 6 show a chip 1a to be mounted on a ball end mill body described later together with the chip 1 of the present invention.
[0023]
Compared with the chip 1, the chip 1 a is characterized in that the distance between the nose 8 on one side and the nose 8 on the other side is large, and the opposing side edge 7 is long. In addition, a 1/4 arc-shaped cutting edge 6, an opposing side ridge 7 opposed to the 1/4 arc-shaped cutting edge 6, and a nose 8 are formed at a portion where the 1/4 arc-shaped cutting edge 6 and the opposing side ridge 7 intersect. it positive type is of the chip 1 and the adjacent nose 8 in the rake face 2, as it goes from the center of the rake face 2 to the nose 8 side, inclined flat surfaces approaching the lower surface that is seated surface 3 5 is the same as the chip 1 in that the strength of the nose 8 portion is improved.
[0024]
These chips 1 and 1a are mounted on a ball end mill main body 12 shown in FIGS. Hereinafter, this point will be described.
[0025]
At the tip of a substantially cylindrical ball end mill main body 12 having a substantially hemispherical tip, it is notched in an L-shape as shown in FIG. 7 when viewed from the tip in the axial direction on opposite sides of the axis 10. A pair of grooves 11 and 11 are formed as described above, and the chips 1 and 1a are detachably attached to a chip mounting seat formed on a wall surface facing the end mill rotation direction of the grooves 11 and 11 by a clamp screw. The quarter arcuate cutting edge 6 of the chip 1 is mounted so as to be involved in cutting. One chip 1 is arranged beyond the axis 10, and the other chip 1 a is arranged so as not to exceed the axis 10. The tip 1 is mounted on the ball end mill tool body with a positive axial rake angle.
[0026]
According to the ball end mill configured as described above using the chips 1 and 1a, as shown in FIG. 11, the ¼ arc-shaped cutting blade 6 has the same arc in the top view of the chip 1, As shown in FIG. 10, the lower edge ridge of the side surface 4 of the chip 1 is less likely to interfere with the work material. Therefore, since it is difficult for chatter to occur in the chip 1, cutting edge loss, or abnormal wear, it is possible to prevent problems such as processing defects and shortening the life of the chip 1. .
[0027]
Incidentally, reference numeral 14 ′ in FIG. 11 denotes a tip-side cutting blade when the vicinity of the nose 8 of the ¼ arc-shaped cutting blade 6 does not have the same arc as the other portions as in the prior art. And its extension. As shown in the figure, this portion is inward compared with the corresponding portion 14 of the chip 1 of the present invention.
[0028]
In addition to this, according to the above configuration, the ¼ arc-shaped cutting edge 6 including the portion along the inclined flat surface 5 has the same arc in the top view of the chip 1. Since the bottom shape at the portion is an accurate arc shape, the machining is very easy even when finishing is required.
[0029]
The tip 1 arranged beyond the axis has a ratio of the length of the portion 13 along the inclined flat surface 5 to the total length of the ¼ arc-shaped cutting edge 6 in the top view of the tip 1 being 1. It is preferable that the length is / 9 to 1/7.
[0030]
According to such a configuration, the cutting resistance is small and the cutting edge strength can be kept large.
[0031]
That is, by reducing the inclined flat surface 5 (the ratio is 1/7 or less), the rake face region having a negative rake angle is reduced to reduce the cutting resistance, and in the top view, the ¼ Keeping the cutting edge strength of this portion large by reducing the amount of bulging on the side surface 4 in order to make the portion 13 along the inclined flat surface 5 of the arc-shaped cutting blade 6 the same arc as the other portions. Can do. If the inclined flat surface 5 is too small (the ratio is less than 1/9), the action of reducing the cutting resistance may be insufficient.
[0032]
As mentioned above, although embodiment of this invention was illustrated with the figure, this invention is not limited to the said embodiment. It goes without saying that the present invention can be in any form without departing from the object of the invention.
[0033]
【The invention's effect】
As described above, the throw-away tip for a ball end mill according to the present invention has a plate-like shape, the ridge line portion between the upper surface and the side surface, which is a rake face, a 1/4 arc-shaped cutting edge, and the opposite side facing this A positive type throw-away tip in which a nose is formed at a portion where a ridge and the ¼ arc-shaped cutting edge and the opposite side ridge intersect with each other, the nose from the center of the upper surface adjacent to the nose toward the side is gradually approaching inclined flat surface underneath surface that is seated surface formed, and the quarter-arc-shaped cutting edge includes a portion located ridge portion between the inclined flat face and the side to be the same circular arc when viewed from the chip over the entire length of the cutting edge, the side portions along the ridge portion between the inclined flat face and the side face of the side surfaces along the quarter-arc-shaped cutting edge, by than the other side portion was swelled outward, before 1/4 arcuate cutting edge are the same arc when viewed chip.
[0034]
Therefore, it becomes difficult for the lower edge ridge portion of the side surface of the chip to interfere with the work material. Therefore, since it is difficult for chatter to occur on the tip, to cause a cutting edge defect, or to cause abnormal wear, it is possible to prevent problems such as processing failure and shortening the life of the tip.
[0035]
In addition, since the leading edge on the nose side is an inclined flat surface and the leading edge is not sharp like a convex curved surface, the strength of the edge of this portion is high.
In addition, according to the above configuration, the ¼ arc-shaped cutting edge including the portion along the inclined flat surface has the same arc in the top view of the chip. Since the shape is an accurate arc, even if finishing is necessary, the processing is very easy.
[0036]
Further, in the cutting insert, in a top view of the chip, the length of the portion located ridge portion between the inclined flat face and the side of the quarter-arc-shaped cutting edge, the quarter arcuate When the total length of the cutting blade is 1/9 to 1/7, by reducing the inclined flat surface, the rake face region of the negative rake angle is reduced, cutting resistance is reduced, and in top view, Keeping the cutting edge strength of this portion large by reducing the amount of bulging at the side surface so that the portion along the inclined flat surface of the ¼ arc-shaped cutting blade is the same arc as the other portions. Can do.
[Brief description of the drawings]
FIG. 1 is a front view (top view) of a tip for a ball end mill according to an embodiment of the present invention, which performs cutting in a region beyond the rotation axis of the ball end mill.
FIG. 2 is a right side view of the chip of FIG.
FIG. 3 is a bottom view of the chip of FIG. 1;
4 is a front view (top view) of a chip mounted on a holder together with the chip of FIG. 1. FIG.
FIG. 5 is a right side view of the chip of FIG. 4;
6 is a bottom view of the chip of FIG. 4. FIG.
7 is a front end view of a ball end mill equipped with the tip of FIG. 1 and the tip of FIG. 4;
8 is a front view of the chip of FIG.
FIG. 9 is a top view of the chip of FIG. 7;
10 is an enlarged view of the front end side of the top view of FIG. 9. FIG.
FIG. 11 is an enlarged view of the front end side of the front view of FIG.
FIG. 12 is a front view of a conventional throw-away tip for a ball end mill.
13 is a bottom view of the chip of FIG. 12. FIG.
14 is a front view of a ball end mill equipped with the chip of FIG. 11. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 1a (Throw away for ball end mills) Tip 2 Rake face 3 Seating face 4 Side face 5 Inclined flat face 5a Swelling part 6 1/4 Arc-shaped cutting edge 7 Opposite side edge 8 Nose 9 Flat land 10 Axis 11 Groove 12 Ball End mill body 13 Cutting edge along an inclined flat surface

Claims (2)

板状をなし、すくい面とされる上面と側面との稜線部に、１／４円弧状切刃と、これに対向する対向辺稜と、これら１／４円弧状切刃と対向辺稜とが交わる部分にノーズと、を形成してなるポジタイプのボールエンドミル用スローアウェイチップであって、
前記ノーズに隣接して、前記上面の中央側から前記ノーズに向かうに従い、着座面とされる下面に漸次近づく傾斜平坦面が形成され、且つ、
前記１／４円弧状切刃が、前記傾斜平坦面と側面との稜線部に位置する部分を含む切刃の全長に渡って前記チップの上面視で同一円弧となるように、前記１／４円弧状切刃に沿う側面のうち前記傾斜平坦面と側面との稜線部に沿った側面部分を、他の側面部分よりも外方に膨出させたことを特徴とするボールエンドミル用スローアウェイチップ。A plate-shaped, ridge line portion between the upper surface and the side surface that is a rake face, a 1/4 arc-shaped cutting edge, a facing edge that faces this, a 1/4 arc-shaped cutting edge, and a facing edge and nose portion intersect, a positive type throwaway insert for a ball end mill obtained by forming a
The nose adjacent, as it goes from the center of the top surface to the no's, gradually approaching the inclined flat surface underneath surface that is seated surface is formed, and,
As the quarter-arc-shaped cutting edge, the same arc when viewed in the chip over the entire length of the cutting edge including a portion located ridge portion between the inclined flat face and side, the quarter a side portion along the ridge portion between the inclined flat face and the side face of the side surfaces along the arcuate cutting edge, indexable insert for a ball end mill which is characterized in that is bulged outward from the other side portion . 前記チップの上面視において、前記１／４円弧状切刃のうち前記傾斜平坦面と側面との稜線部に位置する部分の長さが、前記１／４円弧状切刃の全長の１／９〜１／７であることを特徴とする請求項１記載のボールエンドミル用スローアウェイチップ。In a top view of the chip, the length of the portion located ridge portion between the inclined flat face and the side of the quarter-arc-shaped cutting edge, of the total length of the quarter-arc-shaped cutting edge 1/9 The throw-away tip for a ball end mill according to claim 1, which is ˜1 / 7 .
JP2002047084A 2002-02-22 2002-02-22 Throw-away tip for ball end mill Expired - Fee Related JP4184677B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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JP4184677B2 true JP4184677B2 (en) 2008-11-19

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