JP3253230B2 - Throwaway ball end mill - Google Patents
Throwaway ball end millInfo
- Publication number
- JP3253230B2 JP3253230B2 JP08492995A JP8492995A JP3253230B2 JP 3253230 B2 JP3253230 B2 JP 3253230B2 JP 08492995 A JP08492995 A JP 08492995A JP 8492995 A JP8492995 A JP 8492995A JP 3253230 B2 JP3253230 B2 JP 3253230B2
- Authority
- JP
- Japan
- Prior art keywords
- chip
- notch
- tip
- receiving surface
- end mill
- 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 - Fee Related
Links
- 230000000694 effects Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- 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
- B23C5/1036—Ball nose end mills with one or more removable cutting inserts having a single cutting insert, the cutting edges of which subtend 180 degrees
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明はスロアウェー式ボールエ
ンドミルに関し、主として仕上げ精度が要求される金型
等の仕上げ加工に用いられる。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away type ball end mill, and is mainly used for finishing a die or the like which requires finishing accuracy.
【０００２】[0002]
【従来の技術】従来のこの種スロアウェー式ボールエン
ドミルでは、エンドミル本体ａの先端部に設けられる切
り欠きは、その底面部をフラットなチップ受け面に形成
されたり、実開平６−５３０１２号公報に開示されるよ
うに（図９参照）Ｖ字状のチップ受け面ｂに形成されて
いた。また、これらのチップ受け面と接触するチップｃ
の後端面も切り欠き部のチップ受け面ｂと係合するフラ
ットまたはＶ字状の形状に形成されており、切り欠き部
に挿入されたチップｃは、切り欠き部と直角な方向に装
着されるねじ部材ｄの締め付けにより、エンドミル本体
ａに固定されていた。2. Description of the Related Art In this type of conventional throw-away type ball end mill, a notch provided at the tip of an end mill body a has a bottom surface formed on a flat chip receiving surface, or disclosed in Japanese Unexamined Utility Model Publication No. Hei 6-53012. (See FIG. 9), the V-shaped chip receiving surface b is formed. In addition, the chips c that come into contact with these chip receiving surfaces
The rear end surface is also formed in a flat or V-shaped shape to engage with the chip receiving surface b of the notch, and the chip c inserted into the notch is mounted in a direction perpendicular to the notch. The screw member d is fixed to the end mill main body a by tightening.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、チップ
受け面がフラットに形成されたエンドミル本体に、後端
面をフラットに形成したチップを固定する前者の場合に
は、チップの穴やホルダーのピン穴の精度およびクラン
プするピンの精度によりあるいはチップの取り付け方に
よって、エンドミル本体とチップとの同芯度にバラツキ
が発生し易く、振れに結びつくこととなるため、高い仕
上げ精度が要求される仕上げ用のボールエンドミルとし
て使用するには問題があった。しかも、エンドミル本体
とチップの同芯度のバラツキは、両者に設けられる取り
付け穴の相対的な位置精度に依存するため、前記同芯度
のバラツキをチップの固定時に補正することはできなか
った。However, in the former case, in which a tip having a flat rear end face is fixed to an end mill body having a flat tip receiving face, a hole in the tip or a pin hole in the holder is required. Depending on the precision and the precision of the pin to be clamped, or the way in which the tip is attached, the concentricity between the end mill body and the tip is likely to vary, leading to run-out, so finishing balls that require high finishing precision There was a problem in using it as an end mill. In addition, the variation in concentricity between the end mill body and the chip depends on the relative positional accuracy of the mounting holes provided in both, so that the variation in concentricity cannot be corrected when the chip is fixed.
【０００４】また、チップ受け面ｂがＶ字状に形成され
たエンドミル本体ａに、後端面をＶ字状に形成されたチ
ップｃを固定する後者の場合には、エンドミル本体ａと
チップｃとの間に発生する同芯度のバラツキは、高い仕
上げ精度が困難なＶ字形のチップ受け面ｂとチップｃの
取り付け穴との相対的な位置精度によって決まる上に、
この同芯度のずれはチップｃの固定時に補正することが
できないため、高い仕上げ精度が要求される仕上げ用の
ボールエンドミルとして使用するには問題があった。In the latter case, in which a tip c having a V-shaped rear end face is fixed to an end mill body a having a V-shaped tip receiving surface b, the end mill body a and the tip c are fixed to each other. The concentricity variation that occurs between is determined by the relative positional accuracy between the V-shaped chip receiving surface b and the mounting hole of the chip c, for which high finishing accuracy is difficult, and
Since this concentricity deviation cannot be corrected when the chip c is fixed, there is a problem in using it as a finishing ball end mill that requires high finishing accuracy.
【０００５】その上、チップｃはエンドミル本体ａに形
成されたフラットまたはＶ字状のチップ受け面ｂに面接
触する状態で取り付けられるため、これらの当接面の平
面精度やＶ字形の嵌合角にバラツキが発生した場合に
は、加工物の仕上げ精度に悪い影響を与えていた。In addition, since the tip c is mounted in a state of surface contact with a flat or V-shaped chip receiving surface b formed on the end mill main body a, the flatness of these contact surfaces and the V-shaped fitting are achieved. When the corners vary, this has a bad effect on the finishing accuracy of the workpiece.
【０００６】本発明はこれらの事情に鑑みてなされたも
ので、エンドミル本体へのチップの取り付け時に、チッ
プの中心線を自動的にエンドミル本体の中心線と一致さ
せた状態でチップをしっかりと固定し、加工物に対する
仕上げ精度を著しく向上することができるようにしたス
ロアウェー式ボールエンドミルの提供を目的としたもの
である。The present invention has been made in view of these circumstances, and when the chip is mounted on the end mill body, the chip is firmly fixed with the center line of the chip automatically aligned with the center line of the end mill body. Further, it is an object of the present invention to provide a throw-away type ball end mill capable of remarkably improving the finishing accuracy for a workpiece.
【０００７】[0007]
【課題を解決するための手段】本発明は、前記目的を達
成すべくなされたもので、エンドミル本体は先端側にチ
ップ装着用の切り欠きを設けられるとともに、この切り
欠きの底面を円弧状にくぼむチップ受け面に形成され、
切り欠き部分に装着される切り刃を備えたチップは、エ
ンドミル本体のチップ受け面と対向するチップ後端面を
チップ受け面の曲率半径より大きな曲率半径の円弧状突
部に形成され、切り欠きの両側の切り欠き側面部には、
切り欠きと直角をなす方向にクランプ穴が設けられてお
り、一方の側面部に設けられるクランプ穴には、クラン
プねじ部材の頭部に形成される円錐面と対応する部分
に、エンドミル本体の基端側に偏心する円錐受け面が設
けられ、他方の側面部に設けられるクランプ穴には、ク
ランプねじ部材の先端側ねじ部と螺合するめねじが形成
されており、切り欠きのチップ受け面には、クランプね
じ部材の頭部側にのみ切り欠き部の一方の側面を延長さ
せた方向のすり割りが設けられるか、或いは、クランプ
ねじ部材の頭部側に切り欠き部の一方の側面を延長させ
た方向のすり割りが設けられる他、チップ受け面の反対
側に前記すり割りより長さの短いすり割りが設けられて
おり、チップの取り付けは、クランプ穴に螺合されるク
ランプねじ部材の頭部が偏心する円錐受け面から押圧力
を受けて、クランプねじ部材がエンドミル本体の基端側
に少し撓められることにより、チップ後端面をチップ受
け面に押圧して行われることを特徴とするスロアウェー
式ボールエンドミルである。SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the end mill body has a notch for tip mounting at the tip end side, and the bottom surface of the notch is formed in an arc shape. Formed on the concave chip receiving surface,
The tip with the cutting blade attached to the notch portion has a tip rear end face opposed to the tip receiving face of the end mill body formed in an arc-shaped projection having a radius of curvature larger than the radius of curvature of the tip receiving face, and On the cutout sides on both sides,
A clamp hole is provided at a right angle to the
Clamp holes on one side.
Part corresponding to the conical surface formed on the head of the screw member
The eccentric cone receiving surface is provided on the base end side of the end mill body.
And a clamp hole on the other side
A female screw is formed to be screwed into the tip screw part of the lamp screw member.
The notch insert receiving surface has a clamp
Extend one side of the notch only on the head side of the
Slot in the direction of the cut or clamp
Extend one side of the notch to the head side of the screw member
Slot in the opposite direction and opposite the chip receiving surface
The side has a slit that is shorter than the slit
And insert the tip into the clamp hole.
Pressing force from the cone receiving surface where the head of the lamp screw member is eccentric
Receiving the clamp screw member on the base end side of the end mill body.
The ball end mill is a throw-away type ball end mill characterized in that the tip end surface is pressed against the chip receiving surface by being slightly bent .
【０００８】[0008]
【０００９】[0009]
【作用】エンドミル本体の切り欠き部にチップを挿入し
てクランプねじ部材を締め付けると、クランプねじ部材
の頭部は偏心した円錐受け面に押圧されてその上端側を
エンドミル本体の基端側に湾曲されるため、装着された
チップはエンドミル本体の切り欠きに形成された円弧状
のチップ受け面に移動されて、チップ後端面をチップ受
け面に保持される。When the tip is inserted into the notch of the end mill body and the clamp screw member is tightened, the head of the clamp screw member is pressed by the eccentric cone receiving surface, and the upper end side is bent toward the base end side of the end mill body. Therefore, the mounted chip is moved to the arc-shaped chip receiving surface formed in the cutout of the end mill main body, and the rear end face of the chip is held on the chip receiving surface.
【００１０】この場合、チップ受け面と曲率半径が等し
いか大きく形成されたチップ後端面は、チップ受け面の
全体に当接するかチップ受け面の両端部に保持されるた
め、チップはその中心線を自動的にエンドミル本体の中
心線と重なる位置に移動されて芯合わせされるだけでな
く、チップの側面側を湾曲する切り欠き側面部によって
しっかりと保持される。In this case, the chip rear end face formed to have the same or larger radius of curvature as the chip receiving face abuts on the entire chip receiving face or is held at both ends of the chip receiving face. Is automatically moved to a position overlapping with the center line of the end mill main body, and not only is aligned, but also is firmly held by a cutout side portion which curves a side surface side of the chip.
【００１１】[0011]
【実施例】以下、本発明に係る実施例を図面に基づいて
説明する。エンドミル本体１は断面が円形で、先端側の
中心部にチップ装着用の切り欠き２が長さ方向に設けら
れている。切り欠き２は、底面をエンドミル本体１の中
心線上に中心を置いて円弧状にくぼむチップ受け面３に
形成されている（図３、図４参照）。Embodiments of the present invention will be described below with reference to the drawings. The end mill main body 1 has a circular cross section, and a notch 2 for chip mounting is provided in a longitudinal direction at a center portion on the tip side. The notch 2 is formed in a chip receiving surface 3 whose bottom is concavely formed in an arc shape with its center on the center line of the end mill body 1 (see FIGS. 3 and 4).
【００１２】切り欠き２の両側の切り欠き側面部４，４
には、切り欠き２と直角をなす方向にクランプ穴５，５
が設けられている。クランプ穴５は、一方の表面側にエ
ンドミル本体１の基端側に偏心する円錐受け面６が形成
されるとともに、他方の表面側にめねじ７が形成されて
いる（図３、図４参照）。Notch side portions 4 and 4 on both sides of notch 2
Have clamp holes 5 and 5 in a direction perpendicular to
Is provided. The clamp hole 5 has a conical receiving surface 6 eccentric to the base end side of the end mill main body 1 on one surface side and a female screw 7 formed on the other surface side (see FIGS. 3 and 4). ).
【００１３】８はエンドミル本体１の切り欠き２の部分
に装着される板状のチップで、このチップ８は、エンド
ミル本体１の先端側から突出する部分に円弧状の切り刃
９が設けられるとともに、反対側のチップ受け面３と対
向するチップ後端面１０を、チップ受け面３の曲率半径
と等しいか、それより大きな曲率半径の円弧状突部に形
成されている。チップ８の厚さは切り欠き２への挿入の
必要性から、対向する切り欠き側面部４，４の間隔より
わずかに小さくなるように決められる。Reference numeral 8 denotes a plate-like chip mounted on the notch 2 of the end mill main body 1. The chip 8 has an arc-shaped cutting blade 9 provided at a portion protruding from the front end side of the end mill main body 1. The chip rear end face 10 facing the chip receiving face 3 on the opposite side is formed as an arc-shaped projection having a radius of curvature equal to or larger than the radius of curvature of the chip receiving face 3. The thickness of the tip 8 is determined to be slightly smaller than the interval between the opposed notch side portions 4 and 4 because of the necessity of insertion into the notch 2.
【００１４】チップ８を切り欠き２に固定するクランプ
ねじ部材１１は、図２に示すように、頭部の側面側に切
り欠き側面部４の円錐受け面６と係合する円錐面１２が
形成されるとともに、研磨された円形胴部の先端部にめ
ねじ７と螺合するねじ部１３が設けられている。As shown in FIG. 2, the clamp screw member 11 for fixing the tip 8 to the notch 2 has a conical surface 12 which engages with the conical receiving surface 6 of the notch side surface portion 4 on the side surface of the head. At the same time, a threaded portion 13 for screwing with the female thread 7 is provided at the tip of the polished circular body.
【００１５】上記実施例において、エンドミル本体１の
切り欠き２にチップ８を挿入し、クランプねじ部材１１
を締め付けて行くと、下降するクランプねじ部材１１の
頭部は偏心する円錐受け面６から押圧力を受けるため、
クランプねじ部材１１はエンドミル本体１の基端側に少
し撓められ、チップ８との接触点Ｃでチップ８を切り欠
き２のチップ受け面３に押圧するとともに、円錐受け面
６を下側に押圧する作用力によりチップ８の両側面部を
切り欠き側面部４，４によってしっかりと保持する（図
５、図６参照）。In the above embodiment, the tip 8 is inserted into the notch 2 of the end mill body 1 and the clamp screw member 11 is inserted.
, The head of the descending clamp screw member 11 receives the pressing force from the eccentric cone receiving surface 6,
The clamp screw member 11 is slightly bent toward the base end side of the end mill main body 1, presses the chip 8 against the chip receiving surface 3 of the notch 2 at the contact point C with the chip 8, and moves the conical receiving surface 6 downward. By pressing force, both side surfaces of the chip 8 are notched and held firmly by the side surfaces 4 and 4 (see FIGS. 5 and 6).
【００１６】この場合、チップ後端面１０の曲率半径が
チップ受け面３の曲率半径より大きいときには、２つの
円弧面の中心Ｏ，Ｏ1 は両者の接触する２点Ａ，Ｂを結
ぶ弦と垂直な２等分線上にあるため、チップ８の中心線
とエンドミル本体１の中心線とが一致することになる。
この状態に加えて、チップ８は前記各接触点Ａ，Ｂ，Ｃ
に作用する３つの作用力によって保持されるため、その
安定性はきわめて良くなる（図６参照）。加工時におけ
る仕上げ精度は、チップ８の中心線とエンドミル本体１
の中心線との一致の良し悪しとチップ８をいかに安定し
た状態に保持するかによって決まるため、本実施例の構
成のボールエンドミルを用いたときの仕上げ精度は著し
く向上される。In this case, when the radius of curvature of the tip rear end face 10 is larger than the radius of curvature of the chip receiving surface 3, the centers O and O 1 of the two arc surfaces are perpendicular to the chord connecting the two points A and B where they contact. Since they are on a bisector, the center line of the tip 8 and the center line of the end mill body 1 coincide.
In addition to this state, the chip 8 has the contact points A, B, C
Is maintained by the three acting forces acting on the surface of the member (see FIG. 6). The finishing accuracy at the time of processing depends on the center line of the tip 8 and the end mill body 1.
Is determined by the quality of the coincidence with the center line and how the tip 8 is maintained in a stable state, so that the finishing accuracy when the ball end mill having the configuration of the present embodiment is used is remarkably improved.
【００１７】また、チップ後端面１０の曲率半径がチッ
プ受け面３の曲率半径と同じときには、２つの円弧状の
曲線部は周面全体で面接触し、チップ８の中心線とエン
ドミル本体１の中心線とが一致することになるため、こ
の場合にも、ボールエンドミルの仕上げ精度は著しく向
上される。When the radius of curvature of the tip rear end face 10 is the same as the radius of curvature of the tip receiving surface 3, the two arc-shaped curved portions are in surface contact over the entire peripheral surface, and the center line of the tip 8 and the end mill body 1 Since the center line coincides with the center line, the finishing accuracy of the ball end mill is significantly improved in this case as well.
【００１８】図７は本発明の他の実施例を示したもの
で、エンドミル本体１における円錐受け面６を備えた切
り欠き側面部４側のチップ受け面３に、切り欠き２の側
面を延長させた方向に設定された長さのすり割り１４を
設けた場合である。この構成の場合、すり割り１４は切
り欠き側面部４の切り欠き２側への撓みをより円滑に行
わせる働きをするため、切り欠き側面部４，４によるチ
ップ８の保持作用をより確実にし、仕上げ精度を向上さ
せることができる。FIG. 7 shows another embodiment of the present invention, in which the side surface of the notch 2 is extended to the chip receiving surface 3 on the side of the notch side surface 4 having the conical receiving surface 6 in the end mill body 1. This is a case where a slot 14 having a length set in the direction in which the slit 14 is provided is provided. In the case of this configuration, the slot 14 functions to more smoothly bend the notch side portion 4 toward the notch 2, so that the holding action of the chip 8 by the notch side portions 4 and 4 is more reliable. And the finishing accuracy can be improved.
【００１９】図８は本発明のさらに他の実施例を示した
もので、チップ受け面３の円錐受け面６側に設定された
長さのすり割り１４を設ける他に、チップ受け面３の反
対側にすり割り１４より長さの短いすり割り１５を設け
た場合である。この構成の場合、エンドミル本体１とク
ランプねじ部材１１との螺合に支承をきたさない状態に
保ちつつ、チップ８をより確実に保持して仕上げ精度を
向上させることができる。FIG. 8 shows still another embodiment of the present invention. In addition to providing a slot 14 having a length set on the conical receiving surface 6 side of the chip receiving surface 3, the chip receiving surface 3 has This is a case where a slit 15 shorter in length than the slit 14 is provided on the opposite side. In the case of this configuration, the tip 8 can be more reliably held and the finishing accuracy can be improved while keeping the screwing between the end mill main body 1 and the clamp screw member 11 from being supported.
【００２０】[0020]
【発明の効果】本発明によれば、次に記載するすぐれた
効果が得られる。According to the present invention, the following excellent effects can be obtained.
【００２１】請求項１に記載のスロアウェー式ボールエ
ンドミルにおいては、エンドミル本体は先端側切り欠き
の底面部を円弧状のチップ受け面に形成されるととも
に、チップの後端面をチップ受け面の曲率半径より大き
な円弧状の曲面に形成されているため、クランプねじ部
材によってチップを固定する場合、クランプねじ部材は
チップ後端面を円弧状のチップ受け面に押圧した状態で
チップをしっかりと保持する。このため、チップの取り
付け時に、チップの中心線をエンドミル本体の中心線と
容易に一致させることになり、ボールエンドミルによる
加工物の仕上げ精度を、従来の場合に比べて著しく向上
させることができる。[0021] In Ro away type ball end mill according to claim 1, together with the end mill body is formed a bottom surface portion of the away tip side cut into an arc-shaped chip receiving surface, the chip receiving surface rear end face of the switch-up Greater than the radius of curvature of
When the chip is fixed by the clamp screw member, the clamp screw member firmly holds the chip while pressing the rear end face of the chip against the arc-shaped chip receiving surface. For this reason, the center line of the tip is easily matched with the center line of the end mill body when the tip is mounted, and the finishing accuracy of the workpiece by the ball end mill can be significantly improved as compared with the conventional case.
【００２２】請求項１に記載のスロアウェー式ボールエ
ンドミルにおいては、切り欠き側面部に設けられるクラ
ンプ穴は、クランプねじ部材の頭部に形成される円錐面
と対応する部分に、エンドミル本体の基端側に偏心する
円錐受け面が設けられ、チップの取り付けはクランプ穴
に螺合されるクランプねじ部材により、チップ後端面を
チップ受け面に押圧して行われるから、チップの取り付
け時に、クランプねじ部材はチップの中心線を自動的に
エンドミル本体の中心線と一致させることになり、これ
により、前記効果を容易に達成することができる。[0022] In Ro away type ball end mill according to claim 1, cut clamp hole provided in-away side portion, portions corresponding to portions of the conical surface formed on the head of the clamping screw, the end mill body base An eccentric cone receiving surface is provided on the end side, and the tip is mounted by pressing the rear end face of the chip against the chip receiving surface by a clamp screw member screwed into a clamp hole. The member automatically aligns the center line of the tip with the center line of the end mill body, whereby the above-described effect can be easily achieved.
【００２３】請求項１に記載のスロアウェー式ボールエ
ンドミルにおいては、切り欠きのチップ受け面は、クラ
ンプねじ部材の頭部側に切り欠き部の側面を延長させた
方向のすり割りが設けられているため、クランプねじ部
材の締め付け時に、切り欠き側面部に作用する曲げモー
メントを大きくしてチップ側に弾性変形し易くするとと
もに、切り欠き側面部によるチップの固定をより確実に
前記効果をより良く達成することができる。According to the first aspect of the present invention, the chip receiving surface of the notch is provided with a slit in the direction in which the side surface of the notch is extended on the head side of the clamp screw member. Therefore, when tightening the clamp screw member, the bending moment acting on the notch side surface is increased to make it easier to elastically deform to the chip side, and the chip is more securely fixed by the notch side surface.
The above effects can be better achieved.
【図１】本発明の一実施例を示す平面図である。FIG. 1 is a plan view showing an embodiment of the present invention.
【図２】チップ取り付け時のボールエンドミル先端部の
縦断面図である。FIG. 2 is a longitudinal sectional view of a tip end portion of a ball end mill when a tip is mounted.
【図３】エンドミル本体の先端部の縦断面図である。FIG. 3 is a vertical cross-sectional view of a distal end portion of an end mill main body.
【図４】エンドミル本体の先端部の平面図である。FIG. 4 is a plan view of a distal end portion of the end mill main body.
【図５】クランプねじ部材によるチップの押圧状態を示
す要部縦断面図である。FIG. 5 is a vertical sectional view of a main part showing a state in which a tip is pressed by a clamp screw member.
【図６】チップ後端面の保持状態を示す要部平面図であ
る。FIG. 6 is a plan view of a main part showing a holding state of a chip rear end surface.
【図７】エンドミル本体の他の実施例を示す要部縦断面
図である。FIG. 7 is a longitudinal sectional view of a main part showing another embodiment of the end mill main body.
【図８】エンドミル本体のさらに他の実施例を示す要部
縦断面図である。FIG. 8 is a vertical sectional view of a main part showing still another embodiment of the end mill body.
【図９】従来例を示す平面図である。FIG. 9 is a plan view showing a conventional example.
１ エンドミル本体 ２ 切り欠き ３ チップ受け面 ４ 切り欠き側面部 ５ クランプ穴 ６ 円錐受け面 ８ チップ ９ 切り刃 １０ チップ後端面 １１ クランプねじ部材 １２ 円錐面 １４ すり割り DESCRIPTION OF SYMBOLS 1 End mill main body 2 Notch 3 Tip receiving surface 4 Notch side surface 5 Clamp hole 6 Conical receiving surface 8 Tip 9 Cutting blade 10 Tip rear end face 11 Clamp screw member 12 Conical surface 14 Slotting
フロントページの続き (56)参考文献 特開 平２−160410（ＪＰ，Ａ) 特開 昭52−144892（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23C 5/10 B23B 27/16 Continuation of the front page (56) References JP-A-2-160410 (JP, A) JP-A-52-144892 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) B23C 5 / 10 B23B 27/16
Claims (1)
の切り欠きを設けられるとともに、この切り欠きの底面
を円弧状にくぼむチップ受け面に形成され、 切り欠き部分に装着される切り刃を備えたチップは、エ
ンドミル本体のチップ受け面と対向するチップ後端面を
チップ受け面の曲率半径より大きな曲率半径の円弧状突
部に形成され、 切り欠きの両側の切り欠き側面部には、切り欠きと直角
をなす方向にクランプ穴が設けられており、 一方の側面部に設けられるクランプ穴には、クランプね
じ部材の頭部に形成される円錐面と対応する部分に、エ
ンドミル本体の基端側に偏心する円錐受け面が設けら
れ、 他方の側面部に設けられるクランプ穴には、クランプね
じ部材の先端側ねじ部と螺合するめねじが形成されてお
り、切り欠きのチップ受け面には、クランプねじ部材の頭部
側にのみ切り欠き部の一方の側面を延長させた方向のす
り割りが設けられるか、或いは、クランプねじ部材の頭
部側に切り欠き部の一方の側面を延長させた方向のすり
割りが設けられる他、チップ受け面の反対側に前記すり
割りより長さの短いすり割りが設けられており、 チップの取り付けは、クランプ穴に螺合されるクランプ
ねじ部材の頭部が偏心する円錐受け面から押圧力を受け
て、クランプねじ部材がエンドミル本体の基端側に少し
撓められることにより、チップ後端面をチップ受け面に
押圧して行われることを特徴とするスロアウェー式ボー
ルエンドミル。An end mill main body is provided with a notch for mounting a tip on a tip side, and a bottom surface of the notch is formed in a tip receiving surface having an arcuate concave shape, and a cutting blade mounted on the notch portion. chip with is formed with chip rear surface facing the chip receiving surface of the end mill body in an arc shape protruding in the large radius of curvature Ri by the curvature radius of the chip receiving surface, in cutaway side portions on both sides of the notch Is provided with a clamp hole in a direction perpendicular to the notch, and a clamp hole provided on one side surface has an end mill body at a portion corresponding to a conical surface formed on the head of the clamp screw member. conical receiving surface eccentrically on the base end side is provided in the other of the clamp hole provided in the side surface portions are internally threaded formed to be screwed and the tip end thread portion of the clamping screw member, the notches of the chip The receiving surface, the head of the clamping screw
In the direction in which one side of the notch is extended
A slit is provided or the head of the clamp screw member
In the direction in which one side of the notch is extended
In addition to being provided with a split,
A slot with a length shorter than the split is provided, and when the tip is mounted, the head of the clamp screw member screwed into the clamp hole receives the pressing force from the eccentric cone receiving surface, and the clamp screw member is A throw-away type ball end mill characterized in that the rear end face of the chip is pressed against the chip receiving surface by being slightly bent toward the base end side of the main body.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08492995A JP3253230B2 (en) | 1995-03-15 | 1995-03-15 | Throwaway ball end mill |
| KR1019960006753A KR100402166B1 (en) | 1995-03-15 | 1996-03-13 | Thru-away ball end mill |
| DE19609904A DE19609904A1 (en) | 1995-03-15 | 1996-03-14 | Cutting tool with disposable ball end mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08492995A JP3253230B2 (en) | 1995-03-15 | 1995-03-15 | Throwaway ball end mill |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08252714A JPH08252714A (en) | 1996-10-01 |
| JP3253230B2 true JP3253230B2 (en) | 2002-02-04 |
Family
ID=13844391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08492995A Expired - Fee Related JP3253230B2 (en) | 1995-03-15 | 1995-03-15 | Throwaway ball end mill |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3253230B2 (en) |
| KR (1) | KR100402166B1 (en) |
| DE (1) | DE19609904A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19834635C2 (en) * | 1998-07-31 | 2001-07-26 | Guehring Joerg | Drilling tool with an exchangeable cutting insert that is secured against loosening |
| JP2000141118A (en) | 1998-09-11 | 2000-05-23 | Sumitomo Electric Ind Ltd | Ball end mill |
| JP3279292B2 (en) | 1999-08-02 | 2002-04-30 | 住友電気工業株式会社 | Rotary cutting tool with replaceable cutting edge |
| US20030206777A1 (en) * | 2002-05-03 | 2003-11-06 | Gyllengahm Ulf Stefan | Metal cutting insert having straight cutting edge and curved abutment surface |
| TWI419751B (en) * | 2011-01-25 | 2013-12-21 | Wei Yuan Dzan | Disposable ball mill |
| CN110899800B (en) * | 2019-12-18 | 2021-03-23 | 株洲钻石切削刀具股份有限公司 | Single cutting blade replaceable type finish milling ball head cutter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0282403A (en) * | 1988-09-17 | 1990-03-23 | Toshiba Lighting & Technol Corp | Luminaire |
| JPH02160410A (en) * | 1988-12-08 | 1990-06-20 | Fuji Technica Inc | Ball end mill |
-
1995
- 1995-03-15 JP JP08492995A patent/JP3253230B2/en not_active Expired - Fee Related
-
1996
- 1996-03-13 KR KR1019960006753A patent/KR100402166B1/en not_active IP Right Cessation
- 1996-03-14 DE DE19609904A patent/DE19609904A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| KR100402166B1 (en) | 2004-01-28 |
| JPH08252714A (en) | 1996-10-01 |
| KR960033621A (en) | 1996-10-22 |
| DE19609904A1 (en) | 1996-10-17 |
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