JP4443648B2 - Throwaway end mill and end mill tip - Google Patents

Throwaway end mill and end mill tip Download PDF

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Publication number
JP4443648B2
JP4443648B2 JP19350298A JP19350298A JP4443648B2 JP 4443648 B2 JP4443648 B2 JP 4443648B2 JP 19350298 A JP19350298 A JP 19350298A JP 19350298 A JP19350298 A JP 19350298A JP 4443648 B2 JP4443648 B2 JP 4443648B2
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Japan
Prior art keywords
end mill
tip
cutting edge
arc
outer peripheral
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JP19350298A
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JP2000024824A (en
Inventor
貴之 渡辺
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Tungaloy Corp
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Tungaloy 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
    • B23C5/109—Shank-type cutters, i.e. with an integral shaft with removable cutting inserts
    • 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
    • B23C2200/12—Side or flank surfaces
    • B23C2200/125—Side or flank surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/16—Supporting or bottom surfaces
    • B23C2200/162—Supporting or bottom surfaces curved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/16—Supporting or bottom surfaces
    • B23C2200/164—Supporting or bottom surfaces discontinuous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2200/00—Details of milling cutting inserts
    • B23C2200/36—Other features of the milling insert not covered by B23C2200/04 - B23C2200/32
    • B23C2200/367—Mounted tangentially, i.e. where the rake face is not the face with largest area

Description

【０００１】
【発明の属する技術分野】
本発明は、切削負荷の大きい重切削において使用されるスローアウェイエンドミルおよびエンドミル用チップに関し、特に、エンドミル本体の剛性を低下させることなく複数のチップを並設したものである。
【０００２】
【従来の技術】
スローアウェイエンドミルは、エンドミル本体の周方向に等間隔に形成されたねじれ溝に沿って、複数のエンドミル用チップが中央取付穴の利用により着脱自在に装着されたものである。外周側の切れ刃は分割して形成されているため、切り屑処理性が良く、また、切削力も分散されるため、円滑な切削を行うことができるという利点を有している。
【０００３】
以下に、従来のスローアウェイエンドミルおよびエンドミル用チップの一例を取り上げて、図５及び図６とともに説明する。
【０００４】
図５は、上下面が平行四辺形状と長方形状の２種類のエンドミル用チップ２０、２１を並べて装着したものである。エンドミル用チップ２０、２１相互の軸方向の間隙は、エンドミル本体の回転方向に隣接するねじれ溝の他のエンドミル用チップ２１により補完されて、回転軌跡において連続した切れ刃を構成するようになっている。
【０００５】
平行四辺形状のチップ２０は、切削上のすくい面とされる一対の外周側面２２の交差稜線部のうち上面側の交差稜線部にのみ切れ刃が形成されており、チップ当たり２コーナの使用を可能とするものである。長方形状のチップ２１は、側面２３の４隅に切れ刃が形成されており、チップ当たり４コーナの使用を可能とするものである。
【０００６】
図６は、平行四辺形状のエンドミル用チップ２０を並べて装着したものである。エンドミル本体の先端には、エンドミル用チップ２０の上面２４をエンドミル本体の外周側に向けて装着され、先端から離間した位置には、向きを入れ替えてチップ２０の下面２５を外周側に向けて装着されている。この点、前述した第１の従来技術と異なり、１種類のチップを並べて装着した構成となっている。
【０００７】
【発明が解決しようとする課題】
ここで、以下に従来技術の問題点を記述する。
【０００８】
前記第１の従来技術は、形状の異なる２種類のエンドミル用チップが使用されるため、チップ管理が不利・不便となり、作業性の悪いという問題があった。また、エンドミル本体の先端に装着される平行四辺形状のエンドミル用チップは、チップ当たり２コーナしか使用することができず、工具コストの増加の一因となっていた。
【０００９】
前記第２の従来技術は、同一形状・同大の１種類のチップを並べて装着するとともに、チップ当たり４コーナの使用を可能としたものであり、前記第１の従来技術の課題解決を図ったものであるが、同一溝上に配置されるチップの間隙が狭くなるという新しい問題が生じている。チップ間の間隙が狭いと、バックメタルを確保できなくなくなり、殊に、切削負荷の大きい重切削においては、エンドミル本体の剛性を低下させ、精度の良い加工を行うことができなくなるおそれがある。また、チップの上面側を着座面とした際には、チップ取付座底面との接触がチップ中心部の狭い平坦部領域に限られること、外周側面とチップ取付座壁面との接触については、線接触となることから、チップのサポート性が悪くなり、ガタツキによるチップ寿命の低下の原因となる場合があった。
【００１０】
このようなことから、本発明は、特殊形状のチップにより、エンドミル本体の剛性を低下させることなく、重切削に使用できるようにしたものである。
【００１１】
【課題を解決するための手段】
円柱形状をなすエンドミル本体の外周部分のねじれ溝に組込配列されるエンドミル用チップにおいて、前記エンドミル用チップ１は、外観平行四辺形を呈する上面２および下面３を有してその長辺側側面６がすくい面とされ、上面２から短辺側側面５にかけては、下面３から短辺側側面５にかけて形成される円弧面よりも大きな半径の円弧面１６が形成されるとともに、前記円弧面１６の中心軸の方向と前記上面２となる平行四辺形の長辺の方向とのなす角度は、前記平行四辺形の鋭角より大きく９０°より小さい範囲にあることを特徴とする。
【００１２】
また、前記エンドミル用チップが、その前記長辺側側面と前記円弧面との交差稜線に備わる円弧切れ刃を底刃として、前記エンドミル本体の先端外周側に配設され、また、前記長辺側側面内において前記円弧切れ刃と対角線方向に対向する位置にある直線切れ刃を外周刃として、前記エンドミル本体の先端から離間した位置の外周側に配設されていることを特徴とする。
【００１３】
【発明の実施の形態】
以下、本発明の実施の一形態について図を参照しながら説明する。
【００１４】
図１および図２は、図３に示すエンドミル本体１０に装着される外観平行四辺形のエンドミル用チップ１を示したものである。エンドミル用チップ１は、厚さ方向に並ぶ一対の上下面２、３と、この上下面２、３の周囲に配置される外周側面とからなるいわゆるネガタイプのチップである。上面２は、中央部の幅狭の平坦面と、その両側において外周側面と連なる円弧面１６とから形成されている。上面２の中心には、厚さ方向に貫通する中央取付穴４が形成されている。
【００１５】
外周側面は、互いに対向する一対の短辺側側面５と一対の長辺側側面６とから構成されている。短辺側側面５は、上面２の両側に形成される円弧面１６と一体となって形成されている。この円弧面１６は、下面３と短辺側側面５の交差稜線に形成される円弧稜よりも大きな円弧に形成されている。また、短辺側側面５は、切削上の逃げ面とされるとともに、チップ取付座壁面１３に対しては押圧面となる。長辺側側面６は、一様な平坦面に形成されており、切削上のすくい面とされる面である。チップ取付座壁面１４に対しては、押圧面となる。
【００１６】
長辺側側面６と上下面２、３との交差稜線には、切れ刃が形成されている。長辺側側面６と円弧面１６を含む上面２との交差稜線には、１／４円弧形状の円弧切れ刃８が備わり、長辺側側面６と平坦面とからなる下面３との交差稜線には直線切れ刃９が形成されている。図２（ｂ）に示すように、この円弧切れ刃８を含む円弧面１６の中心軸の方向と上面２となる平行四辺形の長辺の方向とのなす角度αは、上面２の平行四辺形の鋭角βより大きく９０°より小さい範囲にある。この範囲に設定することにより、短辺側側面５の一部には平坦面が残された構成ともなる。
【００１７】
図３及び図４に示す如く、このエンドミル用チップ１を並べて配設した場合は、隣接して装着されるエンドミル用チップ１のバックメタルが確保され、エンドミル本体１０の剛性を向上させることができる。また、上面中央の平坦面も拡大し、着座のサポート性が向上する。さらに、短辺側側面５の平坦部分により、チップ取付座壁面１３に対する接触面積が増大し、殊に、軸方向の切削力に対してのサポート性が著しく向上する。
【００１８】
このようなことから、本発明は、特に、切削負荷の大きい重切削において有効であり、加工精度の高い安定した加工を行うことができる。
【００１９】
図３に示すエンドミル本体１０には、周方向に等間隔に分割された６条のねじれ溝１２が備わっている。ねじれ溝１２は、エンドミル本体１０の軸線に対して、所定の角度γに傾斜して形成されている。この角度γは、軸方向のすくい角を決定するものであり、切りくず処理性や加工精度に強い影響を与える。切りくずは、所定の長さに分断され、円滑に排出されることが望ましい。加工精度をよくするには、切削振動を抑制する必要がある。このようなことから、本発明では、ねじれ角γを１０°に設定している。
【００２０】
前述したように、同一形状・同大のエンドミル用チップ１は、一のねじれ溝１２において、エンドミル本体１０の先端と、先端から離間した位置の２ヶ所に並んで装着されている。エンドミル本体１０の先端には、円弧切れ刃８が底刃となるように、エンドミル用チップ１の上面２をエンドミル本体１０の外周側に向けて装着され、先端から離間した位置には、円弧切れ刃８と対角線方向に対向する位置にある直線切れ刃９が外周刃となるように、向きを入れ替えてチップ１の下面３を外周側に向けて装着されている。これにより、先端においては、円弧切れ刃８を有する鋭角端部７が底面側に向けて装着されるため、逃げ角の備わるいわゆるポジタイプのチップを用いた場合と同様の効果が得られる。また、上下面２、３の向きを入れ替えて装着されることにより、チップ当たりの生産性が向上し、経済的でもある。
【００２１】
一方、一のねじれ溝１２に隣接して周方向に前後する他のねじれ溝１２には、エンドミル本体１０の先端から離間した位置に、エンドミル用チップ１が装着されている。このエンドミル用チップ１は、一のねじれ溝１２に並んで配設されたエンドミル用チップ１の軸方向の間隙を直線切れ刃９により補完する役割を有しており、全体として、隣接する２条のねじれ溝１２の合計３個のエンドミル用チップ１が、１組となって、切れ刃を完成させる構成となっている。すなわち、連続した３枚の切れ刃を備えるエンドミルと同等の効果が得られる。このように、複数のエンドミル用チップ１で切れ刃を分割して構成することは、切りくずを細かく分断する上で有利であり、同時に、切削抵抗を分散することができ、振動の抑制された円滑な切削を行うことができる。
【００２２】
【発明の効果】
本発明によれば、隣接して装着されるエンドミル用チップのバックメタルが確保され、エンドミル本体の剛性を高めることができる。また、上面の平坦面が拡大し、着座のサポート性を向上させることができる。これにより、切削負荷の大きい重切削を円滑に行うことができる。
更に、エンドミル用チップには、底刃と外周刃とに対応する円弧切れ刃と直線切れ刃とが備えられているため、チップ当たりの生産性が向上し、経済的でもある。
【図面の簡単な説明】
【図１】本発明に係わるエンドミル用チップの一実施形態を示す斜視図である。
【図２】（ａ）は、図１の平面図であり、（ｂ）は正面図である。
【図３】本発明に係わるスローアウェイエンドミルの一実施形態であって、（ａ）は正面図であり、（ｂ）は底面図である。
【図４】図１のエンドミル用チップが図３のスローアウェイエンドミルに並べて装着された状態を示す図である。
【図５】従来のエンドミル用チップの一例と、そのチップが装着された状態の一例を示す図である。
【図６】従来のエンドミル用チップの一例と、そのチップが装着された状態の他の一例を示す図である。
【符号の説明】
１ チップ本体
５ 短辺側側面
６ 長辺側側面
８ 円弧切れ刃
１０ エンドミル本体
１２ ねじれ溝[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a throw-away end mill and an end mill tip used in heavy cutting with a large cutting load, and more particularly, a plurality of tips are arranged side by side without reducing the rigidity of the end mill body.
[0002]
[Prior art]
The throw-away end mill is configured such that a plurality of end mill tips are detachably mounted along a torsion groove formed at equal intervals in the circumferential direction of the end mill body by using a central mounting hole. Since the outer peripheral cutting edge is divided and formed, the chip disposal is good and the cutting force is also dispersed, so that there is an advantage that smooth cutting can be performed.
[0003]
Hereinafter, an example of a conventional throw-away end mill and a tip for an end mill will be taken up and described with reference to FIGS.
[0004]
FIG. 5 shows two types of end mill chips 20 and 21 mounted side by side in which the upper and lower surfaces have a parallelogram shape and a rectangular shape. The axial gap between the end mill tips 20 and 21 is complemented by another end mill tip 21 in the twist groove adjacent to the rotation direction of the end mill body to form a continuous cutting edge in the rotation locus. Yes.
[0005]
The parallelogram-shaped tip 20 has a cutting edge formed only on the upper ridge line portion of the cross ridge line portions of the pair of outer peripheral side surfaces 22 that are rake surfaces in cutting, and use two corners per chip. It is possible. The rectangular chip 21 has cutting edges formed at the four corners of the side surface 23, and enables use of four corners per chip.
[0006]
FIG. 6 shows a parallelogram-shaped end mill tip 20 mounted side by side. At the tip of the end mill body, the upper surface 24 of the end mill tip 20 is mounted toward the outer peripheral side of the end mill body, and at a position away from the tip, the orientation is changed and the lower surface 25 of the chip 20 is mounted toward the outer peripheral side. Has been. In this respect, unlike the first prior art described above, one type of chips are mounted side by side.
[0007]
[Problems to be solved by the invention]
Here, the problems of the prior art are described below.
[0008]
In the first conventional technique, since two types of end mill tips having different shapes are used, there is a problem that chip management becomes disadvantageous and inconvenient and workability is poor. In addition, the parallelogram-shaped end mill tip attached to the end of the end mill main body can use only two corners per tip, which contributes to an increase in tool cost.
[0009]
The second prior art is one in which one type of chip having the same shape and size is mounted side by side and enables the use of four corners per chip, thereby solving the problems of the first prior art. However, there is a new problem that the gap between the chips arranged in the same groove becomes narrow. If the gap between the chips is narrow, the back metal cannot be secured. In particular, in heavy cutting with a heavy cutting load, there is a possibility that the rigidity of the end mill body is lowered and accurate machining cannot be performed. In addition, when the upper surface side of the chip is used as a seating surface, contact with the bottom surface of the chip mounting seat is limited to a narrow flat region at the center of the chip, and contact between the outer peripheral side surface and the wall surface of the chip mounting seat is Since the contact occurs, the supportability of the chip is deteriorated, which may cause a decrease in the chip life due to rattling.
[0010]
For this reason, the present invention can be used for heavy cutting without reducing the rigidity of the end mill body by using a specially shaped tip.
[0011]
[Means for Solving the Problems]
An end mill tip that is assembled and arranged in a torsion groove in an outer peripheral portion of a cylindrical end mill body, wherein the end mill tip 1 has an upper surface 2 and a lower surface 3 having an external parallelogram shape, and its long side surface. 6 is a rake face, from the upper surface 2 to the short side face 5, with the arc surface 16 of larger radius than the circular arc surface formed over the lower surface 3 on the short side face 5 is formed, the circular arc surface 16 the angle between the direction of the center axis direction of the long side of the parallelogram to be the top surface 2 of the is characterized in that it is largely smaller than 90 ° range from an acute angle of the parallelogram.
[0012]
Further, the end mill tip is disposed on the outer peripheral side of the tip end of the end mill main body with an arc cutting edge provided on a cross ridge line between the long side surface and the arc surface as a bottom blade, and the long side A linear cutting edge that is diagonally opposite to the arc cutting edge in the side surface is used as an outer peripheral cutting edge, and is arranged on the outer peripheral side at a position spaced from the tip of the end mill body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[0014]
FIGS. 1 and 2 show an external parallelogram end mill tip 1 attached to the end mill body 10 shown in FIG. The end mill tip 1 is a so-called negative type tip composed of a pair of upper and lower surfaces 2 and 3 arranged in the thickness direction and outer peripheral side surfaces arranged around the upper and lower surfaces 2 and 3. The upper surface 2 is formed by a narrow flat surface at the center and an arc surface 16 continuous with the outer peripheral surface on both sides thereof. At the center of the upper surface 2, a central mounting hole 4 penetrating in the thickness direction is formed.
[0015]
The outer peripheral side surface includes a pair of short side surfaces 5 and a pair of long side surfaces 6 that face each other. The short side surface 5 is formed integrally with arcuate surfaces 16 formed on both sides of the upper surface 2. The arc surface 16 is formed in an arc larger than the arc ridge formed at the intersecting ridge line of the lower surface 3 and the short side surface 5. Further, the short side surface 5 serves as a flank face for cutting and also serves as a pressing surface for the chip mounting seat wall surface 13. The long side surface 6 is a flat surface that is formed as a rake face for cutting. It becomes a pressing surface for the chip mounting seat wall surface 14.
[0016]
A cutting edge is formed on the intersecting ridge line between the long side surface 6 and the upper and lower surfaces 2 and 3. The intersecting ridgeline between the long side surface 6 and the upper surface 2 including the arc surface 16 is provided with a ¼ arc-shaped arc cutting edge 8, and the intersecting ridgeline between the long side surface 6 and the lower surface 3 composed of a flat surface. A straight cutting edge 9 is formed in the. As shown in FIG. 2B , the angle α between the direction of the central axis of the arc surface 16 including the arc cutting edge 8 and the direction of the long side of the parallelogram that forms the upper surface 2 is the parallelogram of the upper surface 2. It is in a range larger than the acute angle β of the shape and smaller than 90 °. By setting in this range, a flat surface is left on a part of the short side surface 5.
[0017]
As shown in FIGS. 3 and 4, when the end mill tips 1 are arranged side by side, the back metal of the end mill tip 1 mounted adjacent to the end mill tip 1 is secured, and the rigidity of the end mill body 10 can be improved. . In addition, the flat surface at the center of the upper surface is enlarged, and seating support is improved. Furthermore, the flat portion of the short side surface 5 increases the contact area with the chip mounting seat wall surface 13, and in particular, the support for the axial cutting force is remarkably improved.
[0018]
For this reason, the present invention is particularly effective in heavy cutting with a large cutting load, and can perform stable machining with high machining accuracy.
[0019]
The end mill main body 10 shown in FIG. 3 includes six twisted grooves 12 that are divided at equal intervals in the circumferential direction. The twist groove 12 is formed to be inclined at a predetermined angle γ with respect to the axis of the end mill body 10. This angle γ determines the rake angle in the axial direction, and has a strong influence on chip disposal and machining accuracy. It is desirable that the chips are divided into a predetermined length and discharged smoothly. In order to improve machining accuracy, it is necessary to suppress cutting vibration. Therefore, in the present invention, the twist angle γ is set to 10 °.
[0020]
As described above, the end mill tip 1 having the same shape and the same size is mounted side by side in one twisted groove 12 in two locations, the tip of the end mill body 10 and a position spaced from the tip. At the tip of the end mill body 10, the top surface 2 of the end mill tip 1 is mounted toward the outer peripheral side of the end mill body 10 so that the arc cutting edge 8 becomes a bottom blade. The direction is changed so that the lower surface 3 of the chip 1 faces toward the outer peripheral side so that the straight cutting edge 9 located diagonally opposite to the blade 8 becomes the outer peripheral blade. Thereby, since the acute angle end portion 7 having the arc cutting edge 8 is mounted toward the bottom surface at the tip, the same effect as in the case of using a so-called positive type chip having a clearance angle can be obtained. Further, by mounting the upper and lower surfaces 2 and 3 in a different direction, the productivity per chip is improved and economical.
[0021]
On the other hand, the end mill tip 1 is mounted in a position spaced apart from the tip of the end mill main body 10 in another twist groove 12 which is adjacent to the one twist groove 12 and moves back and forth in the circumferential direction. The end mill tip 1 has a role of complementing the axial gap of the end mill tip 1 arranged side by side with one twist groove 12 by the straight cutting blades 9 as a whole. A total of three end mill tips 1 of the torsional grooves 12 form a set to complete the cutting edge. That is, the same effect as an end mill having three continuous cutting edges can be obtained. As described above, it is advantageous to divide the cutting edge with a plurality of end mill tips 1 in order to finely divide the chips, and at the same time, it is possible to disperse the cutting resistance and suppress vibrations. Smooth cutting can be performed.
[0022]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the back metal of the end mill chip | tip mounted adjacently is ensured, and the rigidity of an end mill main body can be improved. Moreover, the flat surface of the upper surface is enlarged, and the supportability of seating can be improved. Thereby, heavy cutting with a large cutting load can be performed smoothly.
Furthermore, since the end mill tip is provided with an arc cutting edge and a linear cutting edge corresponding to the bottom edge and the outer peripheral edge, productivity per chip is improved and economical.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an end mill tip according to the present invention.
2A is a plan view of FIG. 1, and FIG. 2B is a front view.
FIG. 3 shows an embodiment of a throw-away end mill according to the present invention, in which (a) is a front view and (b) is a bottom view.
4 is a view showing a state in which the end mill tip of FIG. 1 is mounted side by side on the throw-away end mill of FIG. 3;
FIG. 5 is a diagram showing an example of a conventional end mill tip and an example of a state in which the tip is mounted.
FIG. 6 is a view showing an example of a conventional end mill tip and another example of a state in which the tip is mounted.
[Explanation of symbols]
1 Chip Body 5 Short Side Side 6 Long Side Side 8 Arc Cutting Edge 10 End Mill Body 12 Torsion Groove

Claims (2)

円柱形状をなすエンドミル本体の外周部分のねじれ溝に組込配列されるエンドミル用チップにおいて、前記エンドミル用チップ１は、外観平行四辺形を呈する上面２および下面３を有してその長辺側側面６がすくい面とされ、上面２から短辺側側面５にかけては、下面３から短辺側側面５にかけて形成される円弧面よりも大きな半径の円弧面１６が形成されるとともに、前記円弧面１６の中心軸の方向と前記上面２となる平行四辺形の長辺の方向とのなす角度αは、前記平行四辺形の鋭角βより大きく９０°より小さい範囲にあることを特徴とするエンドミル用チップ。 An end mill tip that is assembled and arranged in a torsion groove in an outer peripheral portion of a cylindrical end mill body, wherein the end mill tip 1 has an upper surface 2 and a lower surface 3 having an external parallelogram shape, and its long side surface. 6 is a rake face, and an arc surface 16 having a larger radius than the arc surface formed from the lower surface 3 to the short side surface 5 is formed from the upper surface 2 to the short side surface 5. An end mill tip characterized in that an angle α formed by the direction of the central axis of the parallelogram and the direction of the long side of the parallelogram forming the upper surface 2 is in a range larger than the acute angle β of the parallelogram and smaller than 90 °. . 請求項１に記載のエンドミル用チップを装着するスローアウェイエンドミルにおいて、前記エンドミル用チップ１が、その前記長辺側側面６と前記円弧面１６との交差稜線に備わる円弧切れ刃８を底刃として、前記エンドミル本体１０の先端外周側に配設され、また、前記長辺側側面５内において前記円弧切れ刃８と対角線方向に対向する位置にある直線切れ刃９を外周刃として、前記エンドミル本体１０の先端から離間した位置の外周側に配設されていることを特徴とするスローアウェイエンドミル。 The throw-away end mill to which the end mill tip according to claim 1 is mounted, wherein the end mill tip 1 has an arc cutting edge 8 provided on a cross ridge line between the long side surface 6 and the arc surface 16 as a bottom edge. The end mill main body 10 is disposed on the outer peripheral side of the tip, and the end mill main body 10 has a linear cutting edge 9 diagonally opposed to the arc cutting edge 8 in the long side surface 5 as an outer cutting edge. A throw-away end mill, wherein the throw-away end mill is disposed on the outer peripheral side at a position spaced from the tip of the ten.
JP19350298A 1998-07-09 1998-07-09 Throwaway end mill and end mill tip Expired - Fee Related JP4443648B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19350298A JP4443648B2 (en) 1998-07-09 1998-07-09 Throwaway end mill and end mill tip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19350298A JP4443648B2 (en) 1998-07-09 1998-07-09 Throwaway end mill and end mill tip

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JP2000024824A JP2000024824A (en) 2000-01-25
JP4443648B2 true JP4443648B2 (en) 2010-03-31

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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3472752B2 (en) * 2000-08-03 2003-12-02 住友電気工業株式会社 Indexable tip and pin mirror cutter using the same
JP4653300B2 (en) * 2000-11-29 2011-03-16 住友電工ハードメタル株式会社 Turning tool
JP4923333B2 (en) * 2001-04-10 2012-04-25 株式会社タンガロイ Chip and cutter for internal pin mirror
DE102005025815A1 (en) * 2005-06-02 2006-12-07 Kennametal Widia Produktions Gmbh & Co. Kg Cutting insert, in particular for crankshaft machining
DE102005037310A1 (en) 2005-06-02 2006-12-07 Kennametal Widia Produktions Gmbh & Co. Kg cutting insert
BRPI0918035A2 (en) * 2008-09-04 2015-12-01 Tungaloy Corp insert and side cutter.
KR101104545B1 (en) 2009-08-27 2012-01-11 한국야금 주식회사 Cutting insert and Cutter installed the same
KR101221510B1 (en) * 2010-09-17 2013-01-15 대구텍 유한회사 Pin miller inserts and a cutter using the same
WO2014174555A1 (en) * 2013-04-26 2014-10-30 Sumitomo Electric Hardmetal Corp. Indexable cutting insert, cutting insert holder, cutting tool, turning device and turning method

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