JP2573120Y2 - Ball end mill - Google Patents
Ball end millInfo
- Publication number
- JP2573120Y2 JP2573120Y2 JP1992004719U JP471992U JP2573120Y2 JP 2573120 Y2 JP2573120 Y2 JP 2573120Y2 JP 1992004719 U JP1992004719 U JP 1992004719U JP 471992 U JP471992 U JP 471992U JP 2573120 Y2 JP2573120 Y2 JP 2573120Y2
- Authority
- JP
- Japan
- Prior art keywords
- arc
- tip
- tool
- cutting edge
- tool body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Milling Processes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この考案は、立方晶窒化硼素（以
下、ＣＢＮと称する。）やダイヤモンド焼結体等の超高
圧焼結体上に円弧状切刃が設けられてなるボールエンド
ミルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball end mill in which an arc-shaped cutting edge is provided on an ultra-high pressure sintered body such as cubic boron nitride (hereinafter referred to as CBN) or a diamond sintered body.
【０００２】[0002]
【従来の技術】金型加工等に用いられるボールエンドミ
ルとして、従来より、例えば図７に示すように、軸線Ｏ
を中心として回転せしめられる工具本体１の先端部に２
枚のスローアウェイチップ（以下、チップと略称す
る。）２、３が、それぞれの円弧状切刃４、５を工具本
体１の外周側から先端側へ位置させて取り付けられてな
る２枚刃のボールエンドミルＭ0が知られている。ここ
で、チップ２、３のうち一方のチップ２は、図８及び図
９により詳細に示すように、円弧状切刃４と直線状切刃
６とがチップ取付孔７の中心Ｐ0に対して点対称に配置
されてなるもので、円弧状切刃４の先端部には、当該円
弧状切刃４の先端Ｐ1へ近付くほど下面８へ接近する凸
曲線部４ａが形成されている。そして、一方のチップ２
は、その円弧状切刃４の先端Ｐ1を工具本体１の軸線Ｏ
に一致させて取り付けられている。これに対して、他方
のチップ３は、一方のチップ２と同じく円弧状切刃５と
直線状切刃９とを有するものの、その角部に直線的な切
欠１０が設けられる点で一方のチップ２と形状を異にす
る。そして、工具本体１にチップ３を取り付けた場合、
切欠１０の存在によって円弧状切刃５の先端Ｐ2は工具
本体１の軸線Ｏから一定距離ｄだけ離される。2. Description of the Related Art Conventionally, as a ball end mill used for mold processing or the like, for example, as shown in FIG.
The tip of the tool body 1 that is rotated about
A two-blade cutting insert (hereinafter, abbreviated as a tip) 2, 3 is attached with the respective arc-shaped cutting blades 4, 5 positioned from the outer peripheral side of the tool body 1 to the distal end side. ball end mill M 0 is known. Here, as shown in more detail in FIGS. 8 and 9, one of the chips 2 and 3 has an arcuate cutting edge 4 and a straight cutting edge 6 with respect to the center P 0 of the chip mounting hole 7. At the tip of the arc-shaped cutting edge 4, a convex curved portion 4 a is formed, which approaches the lower surface 8 as approaching the tip P 1 of the arc-shaped cutting edge 4. And one chip 2
Moves the tip P 1 of the arcuate cutting edge 4 to the axis O of the tool body 1.
It is attached to match. On the other hand, the other chip 3 has an arc-shaped cutting edge 5 and a linear cutting edge 9 like the one chip 2, but is provided with a linear notch 10 at a corner thereof. 2 and the shape is different. And when the tip 3 is attached to the tool body 1,
Tip P 2 of the arc-shaped cutting edge 5 by the presence of the notch 10 is spaced from the axis O of the tool body 1 by a predetermined distance d.
【０００３】[0003]
【考案が解決しようとする課題】ところで、上述した従
来のボールエンドミルＭ0で金型等の高硬度材料を加工
する場合、チップ２、３のすくい面側にＣＢＮやダイヤ
モンド焼結体等の超高圧焼結体を固着し、この超高圧焼
結体上に円弧状切刃４、５等を形成することによって仕
上げ加工の高速化、高能率化を図ることが盛んに行われ
ている。しかしながら、上述した構成のボールエンドミ
ルＭ0のチップ２、３にそのまま超高圧焼結体を追加し
た場合、当該超高圧焼結体の摩耗が激しくてその性能が
早期に得られなくなるという不都合があった。すなわ
ち、上述した図７に示すボールエンドミルＭ0では、円
弧状切刃５の先端Ｐ2が工具本体１の軸線Ｏから一定距
離ｄだけ離れているので、軸線Ｏから距離ｄだけ隔てた
位置までの間は一方のチップ２の円弧状切刃４でのみ切
削が行われることとなる。しかも、工具本体１の軸線Ｏ
の近傍は工具本体１の外周側に比して切削速度が極めて
遅いため、円弧状切刃４の先端部に加わる切削抵抗も相
当に大きい。そして、超高圧焼結体は、超硬合金等のチ
ップ材料に比して剛性が高い反面靱性が低いため、切削
抵抗が大きい場合の摩耗の進行が著しく早い。従って、
上述したボールエンドミルＭ0にそのまま超高圧焼結体
を用いた場合には、円弧状切刃４の先端部における超高
圧焼結体の摩耗が他の部分に比して遥かに激しくなり、
超高圧焼結体の優れた性能を長期間に渡って発揮させる
ことができないのである。この考案は、このような背景
の下になされたもので、超高圧焼結体付のチップを用い
たボールエンドミルにおいて、超高圧焼結体の優れた切
削性能を長期間に渡って発揮させ得るボールエンドミル
を提供することを目的とする。An invention is the way, when processing the high-hardness material of the mold such as in the conventional ball end mill M 0 as described above, the rake face of the chip 2,3 CBN or diamond sintered body or the like of the ultrasonic 2. Description of the Related Art High-speed sintering is fixed, and arc cutting blades 4, 5 and the like are formed on the ultra-high-pressure sintering body. However, when it adds an extra-high pressure sintered body chips 2 of the ball end mill M 0 of the above-described configuration, there is a disadvantage that its performance wear of the ultra-high-pressure sintered body is severely can not be obtained at an early stage Was. That is, in the ball end mill M 0 shown in FIG. 7 described above, since the distal end P 2 of the arc-shaped cutting edge 5 is spaced by a predetermined distance d from the axis O of the tool body 1, to a position spaced from the axis O by a distance d During this period, cutting is performed only by the arcuate cutting edge 4 of one tip 2. Moreover, the axis O of the tool body 1
Since the cutting speed is extremely slow in the vicinity of the tool body 1 compared to the outer peripheral side of the tool body 1, the cutting resistance applied to the tip of the arc-shaped cutting blade 4 is considerably large. The ultrahigh-pressure sintered body has high rigidity and low toughness as compared with a chip material such as a cemented carbide, so that the wear progresses remarkably quickly when the cutting resistance is large. Therefore,
When the ultra-high pressure sintered body is used for the ball end mill M 0 as it is, the wear of the ultra-high pressure sintered body at the tip of the arc-shaped cutting edge 4 becomes much more intense than other parts,
The superior performance of the ultra-high pressure sintered body cannot be exhibited over a long period of time. The present invention has been made under such a background, and in a ball end mill using a chip with an ultra-high pressure sintered body, the excellent cutting performance of the ultra-high pressure sintered body can be exhibited over a long period of time. It is intended to provide a ball end mill.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
にこの考案は、軸線を中心として回転せしめられる工具
本体と、この工具本体の軸線方向先端部に装着される２
以上のチップとを有し、上記チップは、円弧状切刃を上
記工具本体の外周側から先端側に位置させ、かつこれら
円弧状切刃に連なる表面をすくい面として取り付けられ
てなるボールエンドミルにおいて、上記各チップの円弧
状切刃の内周端を、上記工具本体の軸線方向先端側から
底面視した際に、上記工具本体の軸線を中心として直径
０．１〜０．５mmの円弧状の回転軌跡を描くように上記
工具本体の軸線から離間させるとともに、上記各チップ
の工具本体径方向内周側を向く側面を、上記円弧状切刃
の内周端から工具本体の軸線方向後端側へ向けて、この
軸線に対する傾斜角が１５°〜６０°の範囲となるよう
に、工具本体の径方向外周側へ後退させたことを特徴と
するものである。この場合、チップ形状は、従来と同様
互いに形状を異にするものを用いてもよいが、工具管理
を容易とするには、すべてのチップを同形同大とするこ
とが望ましい。また、チップの寿命を一層延ばすには、
上記各チップを、各々の台金に固着された超高圧焼結体
上に上記円弧状切刃が形成され、かつこれら円弧状切刃
に連なる上記超高圧焼結体の表面が上記すくい面とされ
たものとし、これら各チップの円弧状切刃の内周端に連
なる一定範囲に、上記工具本体の回転方向へ向けて凸を
なし、かつ当該チップの上記内周端に向かうに連れて上
記超高圧焼結体と上記台金との接合面側へ接近する凸曲
線部を形成し、かつ、この凸曲線部の先端に位置する円
弧状切刃の内周端の超高圧焼結体厚さ方向への後退量を
上記超高圧焼結体の厚さ未満に設定すると良い。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a tool body which is rotated about an axis, and a tool body attached to an axial end of the tool body.
In the ball end mill having the above-mentioned tip and the tip, the arc-shaped cutting edge is positioned from the outer peripheral side of the tool body to the tip end side, and the surface connected to these arc-shaped cutting edges is attached as a rake face. When the inner peripheral end of the arc-shaped cutting edge of each of the tips is viewed from the bottom in the axial direction of the tool body, a circular arc having a diameter of 0.1 to 0.5 mm around the axis of the tool body. Rutotomoni is separated from the axis of said tool body so as to draw a rotation locus, the side facing the tool body radially inner periphery of each chip, axial rear end of the tool body from the inner peripheral end of the arcuate cutting edge Towards this side
So that the angle of inclination with respect to the axis is in the range of 15 ° to 60 °
In addition, the tool body is retracted to the radially outer peripheral side of the tool main body. In this case, the chips may be different in shape from each other as in the prior art. However, in order to facilitate tool management, it is desirable that all chips have the same shape and size. To further extend the life of the chip,
An ultra-high pressure sintered body in which each of the above chips is fixed to each base metal
The above-mentioned arcuate cutting blade is formed thereon, and these arcuate cutting blades are formed.
The surface of the ultra-high pressure sintered body connected to
In a certain range connected to the inner peripheral end of the arcuate cutting edge of each of these tips, the tip is convex in the direction of rotation of the tool body, and the superimposed as it goes toward the inner peripheral end of the tip. The thickness of the ultra-high pressure sintered body at the inner peripheral end of the arcuate cutting edge which forms a convex curved portion approaching to the joining surface side between the high pressure sintered body and the base metal and is located at the tip of the convex curved portion The amount of retreat in the direction is preferably set to be less than the thickness of the ultrahigh-pressure sintered body.
【０００５】[0005]
【作用】上記構成によれば、複数のチップの円弧状切刃
を、それぞれの内周端が工具本体の軸線回りに直径０．
１mm〜０．５mmの円弧状の回転軌跡を描くように配置し
ているので、切削時には、各チップの円弧状切刃が工具
本体のほぼ軸線上まで略等しく切削を行う。従って、特
定のチップに偏って摩耗が進行することがなく、切削性
能が早期に損なわれるおそれが小さい。ここで、円弧状
切刃の回転軌跡の直径を０．１mm以上としたのは、０．
１mmに満たない範囲では円弧状切刃の内周端同士が干渉
するおそれが大きく、他方、０．５mmを越えれば工具本
体の軸線近傍における切刃の無い部分が大き過ぎて、被
削材加工面の真球度に無視できない影響が生じるからで
ある。また、チップの工具本体径方向内周側を向く側面
を円弧状切刃の内周端から工具本体の軸線方向後端側へ
向けて、この軸線に対する傾斜角が１５°〜６０°の範
囲となるように、工具本体の径方向外周側へ後退させて
いるので、各チップの円弧状切刃の内周端同士を工具本
体の軸線に接近させたときにチップ側面同士の間に残さ
れる工具本体の肉厚を増大させて工具本体の剛性低下を
防止しつつ、チップの円弧状切刃等に十分な切刃長を与
えて切り込み深さを確保し、円滑な切削を行うことがで
きる。すなわち、この傾斜角が１５°を下回ると上記工
具本体の肉厚を十分に確保できなくなるおそれが生じる
一方、逆に６０°を上回ると、このチップの工具本体径
方向内周側を向く側面の軸線方向後端側が円弧状切刃の
後端側に交差するようになって、円弧状切刃に十分な切
刃長を確保することができなくなるおそれが生じる。 According to the above construction, the arc-shaped cutting blades of the plurality of inserts are formed such that each inner peripheral end has a diameter of about 0.
Since it is arranged so as to describe an arc-shaped rotation locus of 1 mm to 0.5 mm, the arc-shaped cutting edge of each chip performs cutting substantially equal to almost the axis of the tool body at the time of cutting. Therefore, the wear does not progress unevenly to a specific chip, and the possibility that the cutting performance is impaired at an early stage is small. Here, the reason why the diameter of the rotation locus of the arc-shaped cutting edge is set to 0.1 mm or more is 0.1 mm.
If it is less than 1 mm, the inner peripheral edges of the arc-shaped cutting edges are likely to interfere with each other, while if it exceeds 0.5 mm, the part without the cutting edge near the axis of the tool body is too large, and the work material is cut. This is because a non-negligible effect occurs on the sphericity of the surface. Further, the side of the insert facing the radially inner peripheral side of the tool main body is directed from the inner peripheral end of the arcuate cutting edge toward the rear end side in the axial direction of the tool main body, and the inclination angle with respect to this axis is in the range of 15 ° to 60 °.
To the outer circumference of the tool body in the radial direction so that
Because there, preventing decrease in rigidity of the tool body by increasing the wall thickness of the tool body to be left between the chip side surfaces when the inner peripheral edge between the arcuate cutting edge of each chip is closer to the axis of the tool body While giving a sufficient cutting edge length to the arc-shaped cutting edge of the insert.
In addition, the cutting depth can be ensured, and smooth cutting can be performed . In other words, when the inclination angle falls below 15 °,
There is a risk that the thickness of the tool body may not be sufficient
On the other hand, if it exceeds 60 °, the tool body diameter of this insert
The rear end side in the axial direction of the side surface facing the inner peripheral side of the
As it intersects the rear end, sufficient cutting
There is a possibility that the blade length cannot be secured.
【０００６】そして、チップをすべて同形同大とした場
合には、チップを複数種類用意する必要がなくなって工
具の管理が容易化され、かつ、工具の製造コストも低減
される。さらに、円弧状切刃の内周端から一定範囲に凸
曲線部を形成した場合には、円弧状切刃の内周端部の刃
先強度が増大する。ここで、円弧状切刃の内周端におけ
る後退量を超高圧焼結体の厚さ未満とするのは、超高圧
焼結体の厚さを越えて凸曲線部を後退させた場合には、
円弧状切刃の途中に超高圧焼結体と台金との接合部が露
出するために超高圧焼結体が剥がれるおそれが大きいか
らである。If all the chips are of the same shape and size, it is not necessary to prepare a plurality of types of chips, so that the management of the tool is facilitated and the manufacturing cost of the tool is reduced. Further, when the convex curve portion is formed within a certain range from the inner peripheral edge of the arc-shaped cutting blade, the edge strength of the inner peripheral edge of the arc-shaped cutting blade increases. Here, the amount of retreat at the inner peripheral end of the arc-shaped cutting edge is set to be less than the thickness of the ultrahigh-pressure sintered body, when the convex curve portion is retreated beyond the thickness of the ultrahigh-pressure sintered body. ,
This is because the joint between the ultrahigh-pressure sintered body and the base metal is exposed in the middle of the arc-shaped cutting blade, and the ultrahigh-pressure sintered body is likely to be peeled off.
【０００７】[0007]
【実施例】以下、図１〜図６を参照して、本考案の一実
施例を説明する。まず、図３〜図６を参照して本実施例
に係るボールエンドミルの全体構成及びチップ形状を説
明する。図３及び図４に示すように、本実施例のボール
エンドミルＭ1は、軸線Ｏを中心として回転せしめられ
る工具本体２０と、この工具本体２０の軸線方向先端部
に形成されたチップ取付座２１に取付ネジ２２によって
着脱自在に取り付けられる２枚のチップ２３とを有して
いる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. First, an overall configuration and a tip shape of a ball end mill according to the present embodiment will be described with reference to FIGS. As shown in FIGS. 3 and 4, the ball end mill M 1 according to the present embodiment includes a tool main body 20 that is rotated about an axis O, and a tip mounting seat 21 formed at an axial end of the tool main body 20. And two chips 23 which are detachably attached by attachment screws 22.
【０００８】図５及び図６に示すように、チップ２３
は、超硬合金等からなる台金２４の表面にＣＢＮやダイ
ヤモンド焼結体等の超高圧焼結体２５が一定厚さで固着
されてなるもので、超高圧焼結体２５の一側部に円弧状
切刃２６及び直線状切刃２７が形成されている。円弧状
切刃２６の先端（内周端）Ｐ3から一定範囲には、当該
円弧状切刃２６の先端Ｐ3に接近するに連れて超高圧焼
結体２５と台金２４との接合面側へ接近する凸曲線部２
８が形成されている。そして、この凸曲線部２８の先端
Ｐ3における厚さ方向への後退量δは超高圧焼結体２５
の厚さｔ未満とされ、より詳しくは１mm以内に設定され
ている。超高圧焼結体２５の厚さｔ以上とすると、円弧
状切刃２９の超高圧焼結体２２上に延びる部分と台金２
１上に位置する部分との摩耗速度の違いから、台金２１
が大きく摩耗して超高圧焼結体２２の先端Ｐ3側が台金
２１から浮き上がり、超高圧焼結体２２が剥がれ易くな
るからである。なお、上記後退量δ及び上記凸曲線部３
１の曲率半径Ｒは、チップ２０が装着される工具本体の
寸法等に応じて適宜選択されるが、図示の例では工具径
が８０mmのとき、後退量δが１mm、曲率半径Ｒが０．４
mmに設定されている。As shown in FIG. 5 and FIG.
Is a high-pressure sintered body 25 such as a CBN or diamond sintered body fixed at a constant thickness on a surface of a base metal 24 made of a cemented carbide or the like. , An arcuate cutting edge 26 and a straight cutting edge 27 are formed. The predetermined range from the distal end (inner peripheral end) P 3 of the arcuate cutting edges 26, the junction surface of the ultra-high-pressure sintered compact 25 and the metal base 24 As the approaches the distal end P 3 of the arcuate cutting edges 26 Convex curve part 2 approaching to the side
8 are formed. The amount of retreat δ in the thickness direction at the tip P 3 of the convex curve portion 28 is
Is set to be less than 1 mm, more specifically, within 1 mm. If the thickness t of the ultrahigh-pressure sintered body 25 is equal to or more than the thickness t, the portion of the arc-shaped cutting edge 29 extending on the ultrahigh-pressure sintered body 22 and the base metal 2
1 due to the difference in wear rate between the upper part and the lower part.
And greater wear floating from the tip end P 3 side base metal 21 of the ultra-high-pressure sintered compact 22, since ultra-high-pressure sintered body 22 is easily peeled off. The retreat amount δ and the convex curve portion 3
The radius of curvature R of 1 is appropriately selected according to the dimensions of the tool body on which the chip 20 is mounted. In the illustrated example, when the tool diameter is 80 mm, the retraction amount δ is 1 mm, and the radius of curvature R is 0.1 mm. 4
is set to mm.
【０００９】また、チップ２３の直線状切刃２７と反対
側に位置する側面２９は、超高圧焼結体２５の表面３０
に対して鋭角で傾斜し、かつ、円弧状切刃２６の先端Ｐ
3から当該チップ２３の後端側（図５の上方）へ離れる
に従って直線状切刃２７側へ徐々に接近する傾斜面に形
成されている。そして、側面２９の直線状切刃２７と平
行な方向に対する傾斜角θは１５゜ 〜６０゜ の範囲に設
定されている。The side surface 29 of the tip 23 located on the side opposite to the linear cutting blade 27 is formed on the surface 30 of the ultrahigh-pressure sintered body 25.
To the tip P of the arcuate cutting blade 26
The inclined surface is formed so as to gradually approach the linear cutting blade 27 as the tip 23 moves away from the tip 23 toward the rear end side (upward in FIG. 5). The inclination angle θ of the side surface 29 with respect to the direction parallel to the linear cutting blade 27 is set in the range of 15 ° to 60 °.
【００１０】図３及び図４に示すように、チップ２３
は、円弧状切刃２６を工具本体２０の外周側から先端側
へ位置させてチップ取付座２１に装着され、この後、取
付孔３１に装着される取付ネジ２２によって厚さ方向へ
締め付けられて工具本体２０に着脱自在に取り付けられ
る。そして、図１及び図２に示すように、チップ２３が
工具本体２０に取り付けられた状態において、各チップ
２３の円弧状切刃２６の先端Ｐ3は、工具本体２０の軸
線Ｏ方向先端側から底面視した際に、工具本体２０の軸
線Ｏを中心として直径Ｄの円弧状の回転軌跡Ｑを描くよ
うに工具本体２０の軸線Ｏから離される。また、直線状
切刃２７は工具本体２０の軸線Ｏと平行に配置される。
ここで、上記直径Ｄの範囲としては０．１〜０．５mmが
選択される。直径Ｄが０．１mmに満たない範囲では円弧
状切刃２６の先端Ｐ3同士が干渉するおそれが大きく、
他方、直径Ｄが０．５mmを越えれば、工具本体２０の軸
線Ｏの近傍における切刃の無い部分が大きくなり過ぎ
て、被削材加工面の真球度に無視できない影響が生じる
からである。As shown in FIG. 3 and FIG.
Is mounted on the chip mounting seat 21 with the arcuate cutting blade 26 positioned from the outer peripheral side to the distal end side of the tool body 20, and then tightened in the thickness direction by the mounting screw 22 mounted on the mounting hole 31. It is detachably attached to the tool body 20. Then, as shown in FIGS. 1 and 2, in a state where the tips 23 are attached to the tool body 20, the tip P 3 of the arc-shaped cutting blade 26 of each tip 23 is positioned from the tip side of the tool body 20 in the direction of the axis O. When viewed from the bottom, the tool body 20 is separated from the axis O of the tool body 20 so as to draw an arc-shaped rotation trajectory Q having a diameter D about the axis O of the tool body 20. The straight cutting blade 27 is arranged parallel to the axis O of the tool body 20.
Here, 0.1 to 0.5 mm is selected as the range of the diameter D. Is large may interfere tip P 3 between the arc-shaped cutting edge 26 in the range where the diameter D is less than 0.1 mm,
On the other hand, if the diameter D exceeds 0.5 mm, the portion without a cutting edge in the vicinity of the axis O of the tool main body 20 becomes too large, which has a considerable effect on the sphericity of the work surface of the work material. .
【００１１】さらに、図１及び図３に示すように、チッ
プ２３の側面２９は、直線状切刃２７と平行な方向に対
する傾斜角θに従って、円弧状切刃２６の先端Ｐ3から
工具本体２０の軸線Ｏ方向後端側へ向けて工具本体２０
の径方向外周側へ次第に大きく後退せしめられる。Further, as shown in FIGS. 1 and 3, the side surface 29 of the tip 23 is moved from the tip P 3 of the arc-shaped cutting edge 26 to the tool body 20 in accordance with the inclination angle θ with respect to the direction parallel to the linear cutting edge 27. Of the tool body 20 toward the rear end side in the direction of the axis O of the
Is gradually retracted to the radially outer peripheral side.
【００１２】しかして、以上の構成からなるボールエン
ドミルＭ1においては、複数のチップ２３の円弧状切刃
２６を、それぞれの先端Ｐ3が工具本体２０の軸線Ｏの
回りに直径０．１mm〜０．５mmの円弧状の回転軌跡を描
くように配置しているので、切削時には、各チップ２３
の円弧状切刃２６が工具本体２０のほぼ軸線Ｏ上まで略
等しく切削を行う。従って、特定のチップ２３に偏って
超高圧焼結体２５の摩耗が進行することがなく、超高圧
焼結体２５の切削性能が早期に損なわれるおそれが小さ
い。また、チップ２３の側面２９が工具本体２０の軸線
Ｏ方向後端側へ向かうに従い、軸線に対する傾斜角θが
１５°〜６０°の範囲で工具本体２０の径方向外周側へ
次第に大きく後退してゆくので、各チップ２３の円弧状
切刃２６の先端Ｐ3同士が工具本体２０の軸線Ｏに接近
していても、チップ２３の側面２９同士の間に残される
工具本体２０の肉厚が工具本体２０の軸線Ｏ方向後端側
へ向かうほど増大して工具本体２０の剛性が高くなる。
この点、上記傾斜角θが１５°を下回って、例えば側面
２９を工具本体２０の軸線Ｏと平行に設けたりした場合
には、側面２９間に残される工具本体２０の肉厚がチッ
プ２３の先端Ｐ3同士の隙間量に等しくなり、工具本体
２０の先端における剛性低下が著しい。一方、逆に傾斜
角θが６０°を上回ると、上記側面２９の軸線Ｏ方向後
端側が円弧状切刃２６の後端側や直線状切刃２７に交差
してこれらの切刃長が十分に確保できなくなり、これに
伴い当該ボールエンドミルの切り込み深さが制限された
りするおそれがある。 Thus, in the ball end mill M 1 having the above-described configuration, the arc-shaped cutting blades 26 of the plurality of tips 23 are formed such that each tip P 3 has a diameter of 0.1 mm or less around the axis O of the tool body 20. Since they are arranged so as to draw a 0.5 mm arc-shaped rotation trajectory, each tip 23
Of the tool main body 20 cuts substantially equally on the axis O. Therefore, the wear of the ultrahigh-pressure sintered body 25 does not progress unevenly to the specific chip 23, and the possibility that the cutting performance of the ultrahigh-pressure sintered body 25 is impaired at an early stage is small. Further, as the side surface 29 of the tip 23 moves toward the rear end side in the direction of the axis O of the tool body 20, the inclination angle θ with respect to the axis becomes
Since slide into progressively larger receding radially outer periphery of the tool body 20 in the range of 15 ° to 60 °, the tip P 3 between the arc-shaped cutting edge 26 of each chip 23 is not close to the axis O of the tool body 20 However, the thickness of the tool main body 20 remaining between the side surfaces 29 of the tip 23 increases toward the rear end side in the direction of the axis O of the tool main body 20, and the rigidity of the tool main body 20 increases.
In this regard, below the ° the inclination angle θ is 15, for example, the side surface 29 if the interest provided parallel to the axis O of the tool body 20, wall thickness chip 23 of the tool body 20 that is left between the side surface 29 tip P 3 equal to the gap amount between the stiffness reduction at the tip of the tool body 20 is remarkable. On the other hand, incline in reverse
When the angle θ exceeds 60 °, the side surface 29 is positioned after the direction of the axis O.
The end side intersects the rear end side of the arc-shaped cutting edge 26 and the straight cutting edge 27
As a result, these cutting edge lengths cannot be secured sufficiently,
The cutting depth of the ball end mill was limited accordingly
May be lost.
【００１３】そして、チップ２３が同形同大であるた
め、チップ２３を複数種類用意する必要がなくなって工
具の管理が容易化され、かつ、工具の製造コストも低減
される。さらに、円弧状切刃２６の先端部に凸曲線部２
８を形成しているので、円弧状切刃２６の先端部の刃先
強度が増大する。Since the tips 23 have the same shape and the same size, it is not necessary to prepare a plurality of types of the tips 23, so that the management of the tool is facilitated and the manufacturing cost of the tool is reduced. Further, a convex curved portion 2 is provided at the tip of the arc-shaped cutting blade 26.
8, the cutting edge strength at the tip of the arcuate cutting blade 26 is increased.
【００１４】なお、本実施例では、特に２枚刃のボール
エンドミルを例に挙げて説明しているが、本考案はこれ
に限るものではなく、３枚あるいはそれ以上のチップを
有するボールエンドミルにも当然に適用される。In this embodiment, a two-blade ball end mill is described as an example. However, the present invention is not limited to this, and a ball end mill having three or more chips is used. Also applies naturally.
【００１５】[0015]
【考案の効果】以上説明したように、この考案のボール
エンドミルでは、複数のチップの円弧状切刃を、それぞ
れの内周端が工具本体の軸線回りに直径０．１mm〜０．
５mmの円弧状の回転軌跡を描くように配置しているの
で、工具本体の軸線の近傍において特定のチップが偏摩
耗することがなく、各チップの摩耗がほぼ均等に進行す
るため、優れた切削性能を従来より長期に渡って発揮さ
せることができる。しかも、チップの工具本体径方向内
周側を向く側面が円弧状切刃の内周端から工具本体の軸
線方向後端側へ向けて、この軸線に対する傾斜角が１５
°〜６０°の範囲となるように、工具本体の径方向外周
側へ後退しているので、各チップの円弧状切刃の内周端
同士を工具本体の軸線に接近させてもチップ側面同士の
間に残される工具本体の肉厚が十分に確保され、工具本
体の剛性低下が防止される一方、チップにも十分な切刃
長を与えて切り込み深さを確保し、円滑な切削を行うこ
とが可能となる。そして、チップをすべて同形同大とす
れば、チップを複数種類用意する必要がなくなって工具
の管理が容易化され、かつ、工具の製造コストも低減さ
れる。さらに、円弧状切刃の内周端から一定範囲に凸曲
線部を形成すれば、円弧状切刃の内周端部の刃先強度を
増大させることができる。As described above, in the ball end mill of the present invention, the arc-shaped cutting blades of a plurality of chips are formed such that the inner peripheral end of each of them has a diameter of 0.1 mm to 0.1 mm around the axis of the tool body.
Since the arranged draw an arc of rotational path of 5 mm, without particular chip is uneven wear in the vicinity of the axis of the tool body, since the wear of each chip progresses substantially uniformly, excellent cutting The performance can be exhibited over a longer period than before. In addition, the side surface of the insert that faces the radially inner peripheral side of the tool body extends from the inner peripheral end of the arcuate cutting edge toward the rear end side in the axial direction of the tool main body, and the inclination angle with respect to this axis is 15 °.
° to 60 °, so that it retreats to the radially outer peripheral side of the tool main body. While the thickness of the tool body remaining between them is sufficiently ensured to prevent the rigidity of the tool body from decreasing , a sufficient cutting edge is also used for the insert.
Length to secure the depth of cut and perform smooth cutting.
It becomes possible. If all the chips have the same shape and the same size, it is not necessary to prepare a plurality of types of chips, so that the management of the tool is facilitated and the manufacturing cost of the tool is reduced. Further, by forming a convex curve portion within a certain range from the inner peripheral end of the arc-shaped cutting blade, the edge strength of the inner peripheral end of the arc-shaped cutting blade can be increased.
【図１】本考案の一実施例に係るボールエンドミルの先
端回転中心部を工具本体の半径方向から拡大して示す図
である。FIG. 1 is an enlarged view of a tip end rotation center portion of a ball end mill according to an embodiment of the present invention in a radial direction of a tool main body.
【図２】図１のII方向からの矢視図である。FIG. 2 is a view as seen from an arrow II in FIG. 1;
【図３】図１のボールエンドミルの先端部を工具本体の
径方向から側面視して示す図である。FIG. 3 is a side view of the tip of the ball end mill of FIG. 1 viewed from the radial direction of the tool body.
【図４】図３のIV方向からの矢視図である。FIG. 4 is a view from arrow IV in FIG. 3;
【図５】図１〜図４のボールエンドミルで使用するチッ
プの平面図である。FIG. 5 is a plan view of a chip used in the ball end mill of FIGS.
【図６】図５のVI方向からの矢視図である。FIG. 6 is a view from arrow VI in FIG. 5;
【図７】従来のボールエンドミルの先端部を工具本体の
径方向から側面視して示す図である。FIG. 7 is a diagram showing a tip of a conventional ball end mill as viewed from the side in a radial direction of a tool body.
【図８】図７のボールエンドミルで使用するチップの平
面図である。FIG. 8 is a plan view of a chip used in the ball end mill of FIG. 7;
【図９】図８のIX方向からの矢視図である。FIG. 9 is a view as viewed from the direction IX in FIG. 8;
２０ 工具本体 ２３ チップ ２４ 台金 ２５ 超高圧焼結体 ２６ 円弧状切刃 ２８ 凸曲線部 ２９ チップの側面 Ｍ1 ボールエンドミル Ｏ 工具本体の軸線 Ｐ3 円弧状切刃の先端（内周端）Reference Signs List 20 tool main body 23 tip 24 base metal 25 super-high pressure sintered body 26 arc-shaped cutting edge 28 convex curved part 29 side surface of chip M 1 ball end mill O axis of tool body P 3 tip of arc-shaped cutting edge (inner peripheral end)
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B23C 5/10 B23C 5/20──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) B23C 5/10 B23C 5/20
Claims (3)
本体と、この工具本体の軸線方向先端部に装着される２
以上のスローアウェイチップとを有し、上記スローアウ
ェイチップは、円弧状切刃を上記工具本体の外周側から
先端側に位置させ、かつこれら円弧状切刃に連なる表面
をすくい面として取り付けられてなるボールエンドミル
において、 上記各スローアウェイチップの円弧状切刃の内周端を、
上記工具本体の軸線方向先端側から底面視した際に、上
記工具本体の軸線を中心として直径０．１〜０．５mmの
円弧状の回転軌跡を描くように上記工具本体の軸線から
離間させるとともに、上記各スローアウェイチップの工
具本体径方向内周側を向く側面を、上記円弧状切刃の内
周端から工具本体の軸線方向後端側へ向けて、この軸線
に対する傾斜角が１５°〜６０°の範囲となるように、
工具本体の径方向外周側へ後退させたことを特徴とする
ボールエンドミル。1. A tool main body which is rotated around an axis, and a tool main body mounted on an axial end of the tool main body.
With the above-mentioned throw-away tip, the above-mentioned throw-away tip positions the arc-shaped cutting edge from the outer peripheral side of the tool main body to the tip side, and is attached as a rake face with a surface connected to these arc-shaped cutting edges. In the ball end mill, the inner peripheral end of the arc-shaped cutting edge of each of the throw-away inserts is
Upon bottom view from the tip end side in the axial direction of the tool body, Ru is separated from the axis of the tool body so as to draw an arc of rotational path of the diameter 0.1~0.5mm about the axis of the tool body with a side facing the tool body radial inner peripheral side of the respective throw-away tip, toward the inner peripheral end of the arc-shaped cutting edge to the rear end side in the axial direction of the tool body, this axis
So that the inclination angle with respect to is in the range of 15 ° to 60 °.
A ball end mill which is retracted radially outward of a tool body.
同形同大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。2. The ball end mill according to claim 1, wherein all the throw-away tips are of the same shape and the same size.
台金に固着された超高圧焼結体上に上記円弧状切刃が形
成され、かつこれら円弧状切刃に連なる上記超高圧焼結
体の表面が上記すくい面とされるとともに、これら各ス
ローアウェイチップの上記円弧状切刃の内周端に連なる
一定範囲には、上記工具本体の回転方向へ向けて凸をな
し、かつ当該スローアウェイチップの上記内周端に向か
うに連れて上記超高圧焼結体と上記台金との接合面側へ
接近する凸曲線部が形成され、かつこの凸曲線部の先端
に位置する上記円弧状切刃の内周端の当該超高圧焼結体
の厚さ方向への後退量が、上記超高圧焼結体の厚さ未満
とされていることを特徴とする請求項１または２記載の
ボールエンドミル。3. Each of the throw-away chips is
The above arc-shaped cutting edge is formed on the ultra-high pressure sintered body fixed to the base metal.
The ultra-high pressure sintering formed and connected to these arc-shaped cutting edges
The surface of the body is the rake face, and each of the throw-away inserts has a certain range connected to the inner peripheral end of the arc-shaped cutting edge, and is convex toward the rotating direction of the tool body, and A convex curve portion is formed which approaches the joining surface side of the ultrahigh-pressure sintered body and the base metal toward the inner peripheral end of the away chip, and the arc-shaped portion located at the tip of the convex curve portion is formed. 3. The ball according to claim 1, wherein an amount of retreat of an inner peripheral end of the cutting blade in a thickness direction of the ultrahigh-pressure sintered body is less than a thickness of the ultrahigh-pressure sintered body. End mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992004719U JP2573120Y2 (en) | 1992-02-07 | 1992-02-07 | Ball end mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992004719U JP2573120Y2 (en) | 1992-02-07 | 1992-02-07 | Ball end mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0563722U JPH0563722U (en) | 1993-08-24 |
| JP2573120Y2 true JP2573120Y2 (en) | 1998-05-28 |
Family
ID=11591698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992004719U Expired - Lifetime JP2573120Y2 (en) | 1992-02-07 | 1992-02-07 | Ball end mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2573120Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011025374A (en) * | 2009-07-27 | 2011-02-10 | Osg Corp | End mill and method for manufacturing the same |
| JP5182318B2 (en) * | 2010-03-30 | 2013-04-17 | 日立ツール株式会社 | Replaceable blade end mill |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5939122U (en) * | 1982-09-07 | 1984-03-13 | 三菱自動車工業株式会社 | ball end mill |
| JPH0753853Y2 (en) * | 1988-07-11 | 1995-12-13 | 三菱マテリアル株式会社 | Ball end mill |
-
1992
- 1992-02-07 JP JP1992004719U patent/JP2573120Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0563722U (en) | 1993-08-24 |
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|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19980210 |
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