JP2003094227A - Radius end mill - Google Patents
Radius end millInfo
- Publication number
- JP2003094227A JP2003094227A JP2001295608A JP2001295608A JP2003094227A JP 2003094227 A JP2003094227 A JP 2003094227A JP 2001295608 A JP2001295608 A JP 2001295608A JP 2001295608 A JP2001295608 A JP 2001295608A JP 2003094227 A JP2003094227 A JP 2003094227A
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- Prior art keywords
- angle
- blade
- corner
- end mill
- degrees
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本願発明は、外周刃と底刃とのコ
ーナ部にアール加工が施されたエンドミルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an end mill having rounded corners of an outer peripheral blade and a bottom blade.
【０００２】[0002]
【従来の技術】被削材の肩削り加工や溝加工に使用され
る切削工具として、通常のスクエアエンドミルのコーナ
ー部にアールを設けた、いわゆるラジアスエンドミルが
良く知られている。このラジアスエンドミルの外周刃と
底刃とが交差するコーナ部は、切削速度が高くて大きな
切削荷重がかかり、また切削中の切削熱が集中し易いこ
ともあって、最も頻繁に摩耗や欠損が生じ易い部位であ
り、かかるコーナ部において両切刃が鋭利な角度に交差
したままであると、一層摩耗や欠損が助長されて工具寿
命が著しく短縮されてしまうことになる。2. Description of the Related Art A so-called radius end mill in which a corner portion of a normal square end mill is provided with a radius is well known as a cutting tool used for shouldering and grooving a work material. The corner portion where the outer peripheral edge and the bottom edge of this radius end mill intersect with each other has a high cutting speed, a large cutting load is applied, and the cutting heat is likely to be concentrated during the cutting, so that the most frequent wear or chipping occurs. This is a site that is likely to occur, and if both cutting edges are left intersecting at a sharp angle in such a corner portion, wear and breakage are further promoted, and the tool life is significantly shortened.
【０００３】金型等の等高線深彫り加工には、従来より
ボールエンドミルが一般に使用されていたが、高能率切
削の要求が強くなり、上記ボールエンドミルに代えてラ
ジアスエンドミルが使用されてきている。ラジアスエン
ドミルは、ボールエンドミルに比較して切れ刃が被削材
と接触する長さが短く、又、ボールエンドミルでは工具
先端部が工具軸心上になるため切削速度が得られないの
に対し、ラジアスエンドミルでは十分な切削速度が得ら
れるため、切削抵抗が小さく、切れ味が良好であり、高
能率切削に適している。更に、ラジアスエンドミルにつ
いては、その使用目的等に応じて多数の改善がなされて
おり、例えば、特開平７−２４６５０８号公報には、コ
ーナアール刃を補強した例が、又、特開平１１−２１６
６０９には、切削性を向上させた例が開示されている。
一方、金型等の加工では、コーナ部の加工や、深彫り加
工等の工具突き出し量が大きい加工等があり、切削中に
ビビリ振動が発生しやすいため、一般にＮＣプログラム
上処理しやすい送り速度を下げる方法が採られている。
送り速度を下げる方法では、加工能率が下がるだけでな
く、ビビリ振動を抑制する効果が少なく、１刃送り量が
比例して下がるため、切れ刃と被削材の接触回数が多く
なり、摩耗進行が早くなる。また、ビビリ振動抑制効果
の高い、切削速度を下げる方法があるが、これだけで
は、送り速度が比例的に下がり、何れにしても加工能率
が下がるため、最近では、高能率切削を行う手段とし
て、切削速度は下げるが、送り速度は上げる、即ち、１
刃送り量を極端に上げる高送り切削が用いられている。Conventionally, a ball end mill has been generally used for deep contouring of a metal mold or the like, but the demand for high-efficiency cutting has become strong, and a radius end mill has been used instead of the ball end mill. Compared to ball end mills, radius end mills have shorter contact lengths of the cutting edge with the work material.Because the tip of the tool is on the tool axis center, the cutting speed cannot be obtained. Radius end mills are suitable for high efficiency cutting because they have low cutting resistance and good sharpness because they can obtain sufficient cutting speed. Further, regarding the radius end mill, many improvements have been made according to the purpose of use and the like. For example, in JP-A-7-246508, an example in which a corner blade is reinforced is disclosed in JP-A-11-216.
609 discloses an example in which the machinability is improved.
On the other hand, in machining of dies, etc., there are corner machining and machining with large tool protrusion such as deep engraving, and chatter vibration is likely to occur during cutting. The method of lowering is adopted.
The method of lowering the feed rate not only reduces the machining efficiency, but also has little effect of suppressing chatter vibration, and the feed rate of one blade is proportionally reduced, so the number of contact between the cutting edge and the work material increases and the wear progress Will be faster. In addition, there is a method of reducing the cutting speed, which is highly effective in suppressing chatter vibrations, but with this alone, the feed rate decreases proportionally and the machining efficiency decreases in any case, so recently, as a means for performing high efficiency cutting, Cutting speed is reduced but feed rate is increased, ie 1
High-feed cutting is used that extremely increases the blade feed rate.
【０００４】[0004]
【発明が解決しようとする課題】本願発明は、このよう
な事情を鑑みてなされたものであって、１刃送り量を極
端に上げると、コーナアール刃に切削負荷が集中し、コ
ーナアール刃の強度が切削負荷に耐えきれず、欠損によ
り寿命に至るという課題があった。特に、荒加工のよう
に切り込み量が大きい加工において、高送り切削を行う
と、切削抵抗が大きく、一層欠損が生じ易くなるため、
切削条件を更に下げざる得なくなり、高能率切削と呼べ
る状態ではなかった。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. When the feed amount of one blade is extremely increased, the cutting load is concentrated on the corner round blade, and the corner round blade is cut. However, there was a problem in that the strength of could not withstand the cutting load, and the chip could reach the end of its life. In particular, when performing high-feed cutting in machining with a large amount of cutting such as rough machining, cutting resistance is large and defects are more likely to occur.
There was no choice but to lower the cutting conditions, and it was not in a state that could be called high efficiency cutting.
【０００５】[0005]
【本発明の目的】上記のように、本発明の目的とすると
ころは、コーナ部の刃物角を鈍角に設計し、コーナ部に
おける刃先強度を向上させて工具寿命の長いラジアスエ
ンドミルを提供することにある。OBJECTS OF THE INVENTION As described above, an object of the present invention is to provide a radius end mill having a long tool life by designing an obtuse angle at the corner to improve the edge strength at the corner. It is in.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決してかか
る目的を達するため、本発明は、エンドミル先端コーナ
部に略１／４円弧状のコーナアール刃を有するラジアス
エンドミルにおいて、該コーナアール刃の刃物角を、該
エンドミルの底刃側から該エンドミルの外周刃側に向か
うに従い、漸次鋭角から鈍角へ、鈍角から鋭角へ、と増
減させ、且つ、該コーナアール刃の少なくともＲ３０度
〜Ｒ６０度の範囲を鈍角としたことを特徴とするラジア
スエンドミルである。In order to solve the above problems and achieve the above object, the present invention relates to a radius end mill having a corner rounded edge of approximately 1/4 arc at the end corner portion of the end mill. The blade angle of the end mill is gradually increased from the acute angle to the obtuse angle, from the obtuse angle to the acute angle as it goes from the bottom blade side of the end mill to the outer peripheral edge side of the end mill, and at least R30 to R60 degrees of the corner blade. The radius end mill is characterized in that the range of is made obtuse.
【０００７】[0007]
【発明の実施の形態】本発明により、コーナアール刃の
欠損を抑制し、高能率切削が可能になる。コーナアール
刃の刃物角を鈍角とすることは、すくい角を負角に変化
させつつ、逃げ角も同様に変化させて、刃物角、すなわ
ち、刃の肉厚をより厚くすることであり、切削負荷が集
中する切刃部分の刃先強度等を向上させることができ
る。しかし、切刃全体の刃物角を鈍角にすると、切れ味
が劣り、切削抵抗が大きくなることから、切削負荷の集
中するコーナーアール刃の一部のみに用いた。BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, it is possible to suppress the breakage of a corner radius blade and perform high efficiency cutting. To make the corner angle of the cutting edge obtuse is to change the rake angle to a negative angle and also change the clearance angle to make the cutting edge angle, that is, the wall thickness of the blade thicker. It is possible to improve the cutting edge strength of the cutting edge portion where the load is concentrated. However, when the blade angle of the entire cutting edge is made obtuse, the sharpness becomes poor and the cutting resistance becomes large. Therefore, it was used only for a part of the corner radius blade where the cutting load is concentrated.
【０００８】次に、ラジアスエンドミルを使用して高送
り切削を行うには、切削に関与する位置がほとんど変化
しない等高線加工で行うことが一般的であり、本発明で
は、その位置にあたる切刃、すなわち、該コーナアール
刃の少なくともＲ３０度〜Ｒ６０度の間、を鈍角部とし
た。尚、コーナーアール刃の位置は、底刃との繋ぎを０
度（以下、Ｒ０度と称する。）、外周刃との繋ぎを９０
度（以下、Ｒ９０度と称する。）と呼ぶものとする。鈍
角部を設けることにより、切削負荷が集中し、欠損を誘
発しやすい部位の刃先強度を高めることができる。更
に、強度面を重視する場合には、Ｒ１０度〜Ｒ８０度の
間を鈍角としても良いし、切れ味を重視する場合には、
Ｒ３０度〜Ｒ６０度の間を鈍角としても良い。Next, in order to perform high feed cutting using a radius end mill, it is general to perform contour line machining in which the position involved in cutting hardly changes, and in the present invention, the cutting edge corresponding to that position, That is, at least the angle R30 to R60 of the corner round blade was defined as an obtuse angle portion. In addition, the position of the corner radius blade is 0 for the connection with the bottom blade.
Degree (hereinafter referred to as R0 degree) and the connection with the outer peripheral blade is 90 degrees.
Degree (hereinafter referred to as R90 degree). By providing the obtuse angle portion, it is possible to increase the cutting edge strength at a portion where the cutting load is concentrated and a defect is easily induced. Further, when the strength is emphasized, an obtuse angle may be set between R10 degrees and R80 degrees, and when the sharpness is emphasized,
An obtuse angle may be set between R30 degrees and R60 degrees.
【０００９】更に、コーナアール刃の底刃からの繋ぎ部
とコーナアール刃と外周刃との繋ぎ部は、ともに刃物角
を鋭角とすることにより、底刃、外周刃とスムーズに繋
ぐことができ、特に、底刃との繋ぎにおいては、底刃の
すくい角を生かして、コーナーアール刃に繋ぐことがで
きる。鋭角から鈍角への移行を該コーナアール刃の５度
〜３０度の間に設けたのは、底刃のすくい角、刃物角
は、等高線加工のような切削では主となる作用をするた
め、すくい角は正角にしなければならず、コーナーアー
ル刃にも同様にすくい角を正角から負角へ移行させつ
つ、また、逃げ角を底刃のような直線状切刃から曲線状
切刃に変化させるため、すくい角、逃げ角共に変化させ
る。すくい角は底刃の正角からコーナーアール刃との繋
ぎＲ０度では、正角又は０度を保つ。そこからＲ５度、
Ｒ１０度、Ｒ１５度、Ｒ２０度、Ｒ２５度、Ｒ３０度と
すくい角を負角に、漸次大きな角度へと移行させる。こ
のとき、コーナーアール刃の逃げ角は、曲線状切刃に対
応する様に設け、漸次逃げ角を大きくする。これらによ
り、刃物角は、漸次大きくなり、鈍角とする。Further, the connecting portion of the corner round blade from the bottom blade and the connecting portion of the corner round blade and the outer peripheral blade can be smoothly connected to the bottom blade and the outer peripheral blade by making the tool angle acute. In particular, in connection with the bottom blade, the rake angle of the bottom blade can be used to connect with the corner radius blade. The transition from an acute angle to an obtuse angle is provided between 5 degrees and 30 degrees of the corner blade, because the rake angle of the bottom blade and the blade angle have a main action in cutting such as contour line machining. The rake angle must be a positive angle, and the corner radius blade similarly shifts the rake angle from a positive angle to a negative angle, while the relief angle is changed from a straight cutting edge like a bottom blade to a curved cutting edge. Both the rake angle and the clearance angle are changed in order to change to. The rake angle keeps the right angle or 0 degree at the connection R0 degree from the right angle of the bottom blade to the corner radius edge. R5 from there,
The rake angles of R10 degrees, R15 degrees, R20 degrees, R25 degrees, and R30 degrees are shifted to negative angles and gradually increased. At this time, the relief angle of the corner radius blade is provided so as to correspond to the curved cutting edge, and the relief angle is gradually increased. Due to these, the blade angle gradually increases and becomes an obtuse angle.
【００１０】該鈍角から鋭角への移行を該コーナアール
刃のＲ６０度〜Ｒ８５度の間に設けたのは、外周刃のす
くい角、刃物角は、等高線加工のような切削では繰り返
しと共に徐々に切削する量が増加するため、すくい角は
通常用いられる正角が適用されるが、コーナーアール刃
にも同様にすくい角を負角から正角へ移行させつつ、ま
た、逃げ角も曲線状切刃からねじれ切刃に変化するた
め、すくい角、逃げ角共に変化させる。すくい角はコー
ナーアール刃の負角から外周刃との繋ぎＲ９０度では負
角又は０度を保つ。そこから外周刃の基端側に向かっ
て、徐々に本来のすくい角へと移行させる。このとき、
コーナーアール刃・外周刃の逃げ角は、ねじれ切刃に対
応する様に設け、漸次すくい角を正角へ、逃げ角も大き
くする。これらにより、刃物角は、漸次小さくなり、鈍
角から鋭角となる。The transition from the obtuse angle to the acute angle is provided between R60 ° and R85 ° of the corner radius blade because the rake angle and the blade angle of the outer peripheral blade are gradually increased with repetition in cutting such as contour line machining. Since the amount of cutting increases, the rake angle that is normally used is applied, but similarly for the corner radius blade, while shifting the rake angle from the negative angle to the positive angle, the clearance angle is also curved. Since the blade changes from a twisting cutting edge, both the rake angle and the relief angle are changed. The rake angle keeps a negative angle or 0 degree at the R90 degree connection from the negative angle of the corner radius blade to the outer peripheral edge. From there, gradually move to the original rake angle toward the base end side of the outer peripheral blade. At this time,
The relief angles of the corner radius blade and the outer peripheral blade are set so as to correspond to the spiral cutting edge, and the rake angle is gradually increased to a regular angle and the clearance angle is increased. As a result, the blade angle is gradually reduced, and is changed from an obtuse angle to an acute angle.
【００１１】該鈍角の最大値を９５度以上としたのは、
コーナ部は、切削速度が高くて大きな切削荷重がかか
り、また切削中の切削熱が集中し易いこともあって、最
も頻繁に摩耗や欠損が生じ易い部位であり、最も刃先強
度を高めなければならず、刃物角は９５度以上とした。
更に、該コーナアール刃のＲ３０度〜Ｒ５０度の間とし
たのは、すくい面側での切屑の移動距離を縮め、切屑の
排出性をより高める作用もある。ここで、エッジ部の発
生を一層軽減するために、底刃のギャッシュ加工とコー
ナアール刃のギャッシュ加工とを一連の加工で行い、コ
ーナアール刃と底刃の刃先稜線が１つの凸曲線を形成さ
せても良く、コーナアール刃の耐欠損性を高めることが
できる。また、高能率切削を行うには、刃数の多い方が
有利ではあるが、コーナ部がある被加工物の場合、４枚
刃以上の多刃のエンドミルでは、該コーナ部で同時切削
刃が存在し、共振によるビビリ振動が発生しやすくなる
ため、刃数は３枚刃以上で良い。更に、ＴｉＡｌＮ等の
硬質皮膜やＣｒ系の潤滑皮膜を施すことにより、長寿命
化が計れることは言うまでもない。以下、実施例に基づ
き本発明を具体的に説明する。The maximum value of the obtuse angle is set to 95 degrees or more because
The corner portion is a portion where wear and chipping are most likely to occur because the cutting speed is high, a large cutting load is applied, and the cutting heat is likely to be concentrated during cutting. Of course, the blade angle was 95 degrees or more.
Further, the fact that the corner radius is between R30 and R50 has the effect of shortening the chip movement distance on the rake face side and further enhancing the chip discharge property. Here, in order to further reduce the occurrence of the edge portion, the mash processing of the bottom blade and the mash processing of the corner round blade are performed in a series of processing, and the corner ridge lines of the corner blade and the bottom blade form one convex curve. It is also possible to improve the chipping resistance of the corner blade. In addition, in order to perform high efficiency cutting, it is advantageous to have a large number of blades, but in the case of a work piece with a corner portion, in a multi-blade end mill with four or more blades, simultaneous cutting blades are used at the corner portion. Since it is present and chatter vibration due to resonance is likely to occur, the number of blades may be three or more. Further, it goes without saying that a long life can be achieved by applying a hard coating such as TiAlN or a Cr-based lubricating coating. Hereinafter, the present invention will be specifically described based on Examples.
【００１２】[0012]
【実施例】（実施例１）本発明例１として、超微粒子超
硬合金を使用し、刃径１２ｍｍ、コーナアール半径２ｍ
ｍ、３枚刃で、ＴｉＡｌＮコーティングを施したものを
製作した。本発明例１のコーナーアール刃は、Ｒ０度の
刃物角を８３度、Ｒ１５度の刃物角を９０度、Ｒ３０度
の刃物角を９８度、Ｒ４５度の刃物角を１００度、Ｒ６
０度の刃物角を９８度、Ｒ７５度の刃物角を９０度、Ｒ
９０度の刃物角を８７度となるように、Ｒ０度〜Ｒ９０
度に向けて、すくい角を漸次増減させ、逃げ角を漸次増
大させた。尚、比較のため、従来例２として、本発明例
１と同仕様で、Ｒ０度の刃物角を８３度、Ｒ４５度の刃
物角が８５度、Ｒ９０度の刃物角を８７度と、コーナー
アール刃の刃物角が鋭角からなるエンドミルも用いた。Example 1 As Example 1 of the present invention, an ultrafine particle cemented carbide is used, a blade diameter of 12 mm and a corner radius of 2 m.
A three-blade TiAlN coating was manufactured. The corner radius blade of Invention Example 1 has a blade angle of R0 degrees of 83 degrees, a blade angle of R15 degrees of 90 degrees, a blade angle of R30 degrees of 98 degrees, and a blade angle of R45 degrees of 100 degrees, R6.
0 degree blade angle is 98 degrees, R 75 degree blade angle is 90 degrees, R
R0 degree to R90 so that the blade angle of 90 degrees becomes 87 degrees
The rake angle was gradually increased and decreased and the clearance angle was gradually increased as the angle increased. For comparison, as Conventional Example 2, the same specifications as those of Inventive Example 1 are used, with a R0 degree blade angle of 83 degrees, an R45 degree blade angle of 85 degrees, and an R90 degree blade angle of 87 degrees. An end mill having a sharp blade angle was also used.
【００１３】切削諸元は、被削材にＨＲＣ４０のプリハ
ードン鋼を用い、長さ１５０ｍｍ、幅１８ｍｍ、深さ３
０ｍｍ、側壁の片角３度の溝状のポケット加工を、回転
数２６００回転、送り速度１２５０ｍｍ／ｍｉｎ、１刃
送り量０．１６ｍｍ／刃、エンドミル軸方向ピッチ０．
６ｍｍで、工具突き出し長さを６５ｍｍとし、エアブロ
ーで等高線加工を行い、エンドミル損傷状態を観察し
た。その結果、本発明例１は、ポケット加工のコーナ部
の加工においても、ビビリ振動が非常に小さく、切削状
態も安定しており、深さ３０ｍｍまで、即ち、１形状加
工終了後のエンドミル損傷状態は、通常摩耗で摩耗幅は
僅かであり、加工面も良好であった。これに対し、従来
例２は、１刃送り量が大きいため、エンドミル軸方向の
切り込みが１．８ｍｍの３パス目加工の時点でチッピン
グを生じ、更にコーナ部加工時にはビビリ振動が大きく
なり、切削音が大きく、１形状加工終了後のエンドミル
損傷状態は、すでにコーナアール刃が欠損により無くな
っており、当初の加工形状が得られなかった。The cutting data used was HRC40 pre-hardened steel as the work material, and the length was 150 mm, the width was 18 mm, and the depth was 3 mm.
0 mm, groove-shaped pocket with a side wall angle of 3 degrees, rotation speed 2600 rotations, feed speed 1250 mm / min, 1 blade feed amount 0.16 mm / blade, end mill axial pitch 0.
The tool protrusion length was 6 mm, the tool protrusion length was 65 mm, contour processing was performed by air blow, and the damage state of the end mill was observed. As a result, in the invention example 1, chatter vibration was extremely small and the cutting state was stable even in the corner processing of the pocket processing, and the end mill was damaged up to a depth of 30 mm, that is, after the completion of the one-shape processing. Was normally worn, the wear width was slight, and the processed surface was good. On the other hand, in Conventional Example 2, since the feed amount by one blade is large, chipping occurs at the time of the third pass machining where the cutting in the axial direction of the end mill is 1.8 mm, and chatter vibration becomes large during the corner machining, The sound was loud, and the damaged state of the end mill after the completion of the one-shape machining had already disappeared due to the lack of the corner round blade, and the original machined shape could not be obtained.
【００１４】（実施例２）本発明例３〜６として、本発
明例１のラジアスエンドミルと同仕様で、本発明例３と
して、Ｒ０度、Ｒ９０度の刃物角は同じでＲ４５度の刃
物角を９０度、本発明例４として同９５度、本発明例５
として同１０５度、本発明例６として同１１０度のもの
を制作し、実施例１と同様の切削諸元で評価を行った。
その結果、本発明例３〜６は、深さ３０ｍｍまで、即
ち、１形状の加工ができ、当初の加工形状も得られた。
特に、本発明例１及び本発明例４はビビリ振動が非常に
小さく、切削状態も安定しており、エンドミル損傷状態
は、通常摩耗で摩耗幅は僅かであり、加工面も良好であ
ったが、本発明例３で僅かに微小チッピングが認められ
た。本発明例６では、チッピングや欠損は認められなか
ったもののビビリ振動及び切削音がやや大きくなった。(Embodiment 2) Inventive Examples 3 to 6 have the same specifications as the radius end mill of Inventive Example 1, and in Inventive Example 3, the blade angles of R0 and R90 are the same and the blade angle of R45 is the same. 90 °, the same as Example 4 of the present invention, 95 °, Example 5 of the present invention
And the same cutting degree as the invention example 6 were produced, and the same cutting specifications as in Example 1 were evaluated.
As a result, in Examples 3 to 6 of the present invention, it was possible to process one shape up to a depth of 30 mm, and the initial processed shape was also obtained.
Particularly, in the inventive examples 1 and 4, the chatter vibration was very small, the cutting state was stable, and the end mill damage state was normal wear, the wear width was small, and the machined surface was good. In Example 3 of the present invention, slight chipping was slightly observed. In Inventive Example 6, chatter vibration and cutting noise were slightly increased, although no chipping or chipping was observed.
【００１５】（実施例３）本発明例７〜１１、比較例１
２として、本発明例１のラジアスエンドミルと同仕様
で、本発明例７として鋭角から鈍角への移行する箇所を
Ｒ５度、本発明例８として同１０度、本発明例９として
同２０度、本発明例１０として同２５度、本発明例１１
として同３０度、比較例１２として同３５度のものを制
作し、実施例１と同様の切削諸元で評価を行った。その
結果、本発明例７〜１１は、深さ３０ｍｍまで、即ち１
形状の加工ができ、当初の加工形状も得られた。特に、
本発明例１及び本発明例８はビビリ振動が非常に小さ
く、切削状態も安定しており、エンドミル損傷状態は、
通常摩耗で摩耗幅は僅かであり、加工面も良好であった
が、本発明例１１で僅かに微小チッピングが認められ
た。比較例１２では、チッピングが認められ、ビビリ振
動及び切削音がやや大きくなった。Example 3 Inventive Examples 7 to 11 and Comparative Example 1
2, the same specifications as the radius end mill of Inventive Example 1, R5 degrees as the Inventive Example 7 transitioning from an acute angle to an obtuse angle, 10 degrees as the Inventive Example 8 and 20 degrees as the Inventive Example 9, Inventive Example 10 has the same temperature of 25 degrees, and Inventive Example 11
And the same 35 degree as Comparative Example 12 were manufactured, and the same cutting specifications as in Example 1 were evaluated. As a result, Examples 7 to 11 of the present invention have a depth of 30 mm, that is, 1
The shape could be processed, and the original processed shape was obtained. In particular,
Inventive Example 1 and Inventive Example 8 have very small chatter vibration, stable cutting state, and endmill damage state,
The wear width was small due to normal wear and the processed surface was good, but in Example 11 of the present invention, slight chipping was slightly observed. In Comparative Example 12, chipping was recognized, and chatter vibration and cutting noise were slightly increased.
【００１６】（実施例４）本発明例１のラジアスエンド
ミルと同仕様で、本発明例１３として、底刃２のギャッ
シュ加工とコーナＲ刃１のギャッシュ加工とを１連の加
工で行い、コーナＲ刃１と底刃２の刃先稜線が１つの凸
曲線を形成させてたものを製作し、実施例１と同様の切
削テストを行った。その結果、エッジ部が存在しないこ
とによるチッピング抑制だけでなく、切り屑排出性が良
好になり、ビビリ振動が１層少なくなり、切削状態も更
に安定し、１形状加工終了後のエンドミル損傷状態は、
通常摩耗で摩耗幅も１層小さくなった。(Embodiment 4) With the same specifications as the radius end mill of the present invention example 1, as the present invention example 13, the gashing of the bottom blade 2 and the gashing of the corner R blade 1 are carried out in a single series of corners. The R edge 1 and the bottom edge 2 were manufactured such that the edge ridges formed one convex curve, and the same cutting test as in Example 1 was conducted. As a result, not only chipping is suppressed due to the absence of edge parts, chip discharge is improved, chatter vibration is reduced by one layer, the cutting state is more stable, and the end mill damage state after the completion of 1-shape machining is ,
The wear width was reduced by one layer due to normal wear.
【００１７】[0017]
【発明の効果】以上の結果から、本願発明を適用するこ
とにより、金型等の等高線深彫り加工等に使用し、荒加
工のように切り込み量が大きい加工においても、コーナ
アール刃の欠損を抑制し、１刃送りの大きい高能率切削
が可能であるラジアスエンドミルを提供できた。From the above results, by applying the present invention, it is possible to use for the contour deep-drilling processing of a mold or the like and to prevent the corner-edge fracturing even in the processing such as rough processing with a large cutting depth. It was possible to provide a radius end mill capable of performing high-efficiency cutting with a large amount of feed by one blade.
Claims (3)
のコーナアール刃を有するラジアスエンドミルにおい
て、該コーナアール刃の刃物角を、該エンドミルの底刃
側から該エンドミルの外周刃側に向かうに従い、漸次鋭
角から鈍角へ、鈍角から鋭角へ、と増減させ、且つ、該
コーナアール刃の少なくともＲ３０度〜Ｒ６０度の範囲
を鈍角としたことを特徴とするラジアスエンドミル。1. A radius end mill having a corner radius edge of approximately 1/4 arc at the end corner portion of the end mill, wherein the corner angle of the corner radius edge is directed from the bottom edge side of the end mill toward the outer edge edge of the end mill. According to the above, the radius end mill is characterized by gradually increasing or decreasing from an acute angle to an obtuse angle, from an obtuse angle to an acute angle, and setting the corner radius blade at least in the range of R30 to R60 degrees to be obtuse.
て、該鋭角から鈍角への移行を該コーナアール刃のＲ５
度〜Ｒ３０度の間に、該鈍角から鋭角への移行を該コー
ナアール刃のＲ６０度〜Ｒ８５度の間に、設けたことを
特徴とするラジアスエンドミル。2. The radius end mill according to claim 1, wherein the transition from the acute angle to the obtuse angle is made by the R5 of the corner blade.
Radius end mill, characterized in that the transition from the obtuse angle to the acute angle is provided between R60 degrees and R85 degrees of the corner radius blade between the degrees and R30 degrees.
において、該鈍角の最大値を９５度以上で、該コーナア
ール刃のＲ３０度〜Ｒ５０度の間、に設けたことを特徴
とするラジアスエンドミル。3. The radius end mill according to any one of claims 1 and 2, wherein the maximum value of the obtuse angle is 95 degrees or more, and the corner end blade is provided between R30 degrees and R50 degrees. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001295608A JP2003094227A (en) | 2001-09-27 | 2001-09-27 | Radius end mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001295608A JP2003094227A (en) | 2001-09-27 | 2001-09-27 | Radius end mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003094227A true JP2003094227A (en) | 2003-04-03 |
Family
ID=19117009
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001295608A Pending JP2003094227A (en) | 2001-09-27 | 2001-09-27 | Radius end mill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003094227A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005246492A (en) * | 2004-03-01 | 2005-09-15 | Mitsubishi Materials Kobe Tools Corp | Radius end mill |
| US8320154B2 (en) | 2007-08-08 | 2012-11-27 | National Institute For Materials Science | Switching element and application of the same |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06218612A (en) * | 1993-01-21 | 1994-08-09 | Nisshin Kogu Kk | Ball end mill |
| JPH07185908A (en) * | 1993-12-28 | 1995-07-25 | Kyocera Corp | Throw away tip |
| JPH07246508A (en) * | 1994-03-10 | 1995-09-26 | Kobe Steel Ltd | End mill for processing high strength material |
-
2001
- 2001-09-27 JP JP2001295608A patent/JP2003094227A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06218612A (en) * | 1993-01-21 | 1994-08-09 | Nisshin Kogu Kk | Ball end mill |
| JPH07185908A (en) * | 1993-12-28 | 1995-07-25 | Kyocera Corp | Throw away tip |
| JPH07246508A (en) * | 1994-03-10 | 1995-09-26 | Kobe Steel Ltd | End mill for processing high strength material |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005246492A (en) * | 2004-03-01 | 2005-09-15 | Mitsubishi Materials Kobe Tools Corp | Radius end mill |
| JP4645042B2 (en) * | 2004-03-01 | 2011-03-09 | 三菱マテリアル株式会社 | Radius end mill |
| US8320154B2 (en) | 2007-08-08 | 2012-11-27 | National Institute For Materials Science | Switching element and application of the same |
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