JP2003071627A - Cemented carbide square end mill having outer peripheral edge excellent in chipping resistance in high speed cutting - Google Patents
Cemented carbide square end mill having outer peripheral edge excellent in chipping resistance in high speed cuttingInfo
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- JP2003071627A JP2003071627A JP2001265450A JP2001265450A JP2003071627A JP 2003071627 A JP2003071627 A JP 2003071627A JP 2001265450 A JP2001265450 A JP 2001265450A JP 2001265450 A JP2001265450 A JP 2001265450A JP 2003071627 A JP2003071627 A JP 2003071627A
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- cutting edge
- carbide
- mass
- edge portion
- end mill
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、特に高速切削加
工で、外周刃がすぐれた耐チッピング性を発揮する超硬
合金製スクエアエンドミル（以下、単にエンドミルと云
う）に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cemented carbide square end mill (hereinafter, simply referred to as an end mill) which exhibits excellent chipping resistance in an outer peripheral blade particularly in high-speed cutting.
【０００２】[0002]
【従来の技術】従来、一般に、鋼や鋳鉄などの被削材の
面加工や溝加工、さらに肩加工などにエンドミルが用い
られており、このエンドミルとして、底刃と外周刃が形
成された切刃部と、シャンク部とからなる形状を有し、
かつ少なくとも前記切刃部が、結合相形成成分として４
〜１６質量％の割合で含有するＣｏ中に０．１〜３質量
％の割合で固溶含有したＣｒおよび／またはＶ成分によ
る粒成長抑制作用で、硬質相形成成分としての炭化タン
グステン（以下、ＷＣで示す）の粒径を、平均粒径で、
望ましくは０．７μｍ以下とした微粒組織の超硬合金で
構成されたエンドミルが知られている。2. Description of the Related Art Conventionally, end mills have been generally used for surface processing, groove processing, shoulder processing, etc. of work materials such as steel and cast iron. It has a shape consisting of a blade and a shank,
And, at least the cutting edge portion is 4 as a binder phase forming component.
In the content of Co of 16 to 16% by mass, the grain growth suppression effect of Cr and / or V component contained as a solid solution in the ratio of 0.1 to 3% by mass, tungsten carbide as a hard phase forming component (hereinafter, (Indicated by WC) is the average particle size,
An end mill composed of a cemented carbide having a fine grain structure of preferably 0.7 μm or less is known.
【０００３】[0003]
【発明が解決しようとする課題】一方、近年の切削加工
の省力化および省エネ化、さらに低コスト化に対する要
求は強く、これに伴い、切削装置の高性能化と相俟っ
て、切削加工は高速で行われる傾向にあるが、上記の従
来エンドミルにおいては、これを高速切削加工に用いる
と、エンドミル自体に回転振動ぶれが発生し、この回転
振動ぶれは切削速度（回転速度）が速くなるほど大きく
なり、この結果特に外周刃は高ピッチの機械的衝撃を受
けるようになるため、外周刃にはチッピングが発生し易
くなり、したがってエンドミルは外周刃に発生したチッ
ピング（微小欠け）が原因で比較的担持間で使用寿命に
至るのが現状である。On the other hand, in recent years, there is a strong demand for labor saving, energy saving, and cost reduction of the cutting process, and along with this, along with the high performance of the cutting device, the cutting process is Although it tends to be performed at high speed, in the above-mentioned conventional end mill, when this is used for high-speed cutting, rotational vibration blur occurs in the end mill itself, and this rotational vibration blur increases as the cutting speed (rotation speed) increases. As a result, the outer peripheral blade in particular receives a high-pitch mechanical impact, so the outer peripheral blade is apt to be chipped, and therefore the end mill is relatively susceptible to chipping (small chipping) generated on the outer peripheral blade. The current situation is that the carrier reaches the end of its useful life.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明者らは、
上述のような観点から、高速切削加工で、回転振動ぶれ
の発生を防止できるエンドミルを開発すべく、特に上記
の従来エンドミルに着目し、研究を行った結果、少なく
とも切刃部、すなわち切刃部（この場合シャンク部は例
えば高速度鋼で構成した接合構造となる）または切刃部
とシャンク部を、
Ｃｏ：８〜１０質量％、
炭化クロム（以下、Ｃｒ3Ｃ2で示す）および／または炭
化バナジウム（以下、ＶＣで示す）：０．１〜１．５質
量％、
必要に応じてＴａとＮｂの複合炭化物、望ましくは組成
式：（Ｔａ1-XＮｂX）Ｃで表した場合、Ｘ：０．１〜
０．４を満足するＴａとＮｂの複合炭化物［以下、（Ｔ
ａ，Ｎｂ）Ｃで示す］：０．１〜１．５質量％、
ＷＣ：残り、
からなる配合組成を有する圧粉体の焼結体（密度：約１
４．６ｇ／ｃｍ3）に特定した上で、図１にそれぞれ概
略側面図（ａ）、概略正面図（底刃面側）（ｂ）、およ
び概略縦断面図（ｃ）で例示される通り、前記切刃部の
底刃面に円筒状切り込み有底孔を切刃部の長さ方向に沿
って同心に形成し、この円筒状切り込み有底孔に、
Ｃｏ：０．５〜２質量％、
ＷＣ：残り、
からなる配合組成を有する圧粉体の焼結体（密度：約１
５．６ｇ／ｃｍ3）で構成された円筒状チップを嵌着し
た構造とすると共に、実験を重ねた結果として前記円筒
状チップの直径を切刃部の外周刃の外径の２５〜４５
％、同長さを切刃部の長さの２０〜４０％にそれぞれ相
当する寸法をもつものとすると、この結果のエンドミル
においては、前記切刃部の底刃面の円筒状切り込み有底
孔に篏着された相対的に重質の前記円筒状チップによっ
て高速切削でも回転振動ぶれの発生が著しく抑制され、
これによって外周刃のチッピング発生が防止され、長期
に亘ってすぐれた切削性能を発揮するようになる、とい
う研究結果を得たのである。Therefore, the present inventors have
From the above viewpoints, in order to develop an end mill that can prevent the occurrence of rotational vibration shake in high-speed cutting, in particular, focusing on the above-mentioned conventional end mill, as a result of research, at least the cutting edge part, that is, the cutting edge part (In this case, the shank portion has, for example, a joining structure made of high-speed steel) or the cutting edge portion and the shank portion are made of Co: 8 to 10% by mass, chromium carbide (hereinafter referred to as Cr 3 C 2 ) and / or Vanadium carbide (hereinafter referred to as VC): 0.1 to 1.5% by mass, if necessary, a composite carbide of Ta and Nb, preferably a composition formula: (Ta 1-X Nb X ) C, X: 0.1
A composite carbide of Ta and Nb satisfying 0.4 [hereinafter, (T
a, Nb) C]]: 0.1 to 1.5% by mass, WC: balance, and a sintered compact of a compact (density: about 1).
4.6 g / cm 3 ), and as illustrated in FIG. 1, a schematic side view (a), a schematic front view (bottom blade surface side) (b), and a schematic longitudinal sectional view (c), respectively. A cylindrical cut bottomed hole is concentrically formed in the bottom blade surface of the cutting blade portion along the length direction of the cutting blade portion, and Co: 0.5 to 2 mass% is provided in the cylindrical cut bottomed hole. , WC: the rest, a sintered body of a green compact having a composition composition (density: about 1
5.6 g / cm 3 ), a cylindrical tip having a diameter of 25 to 45 of the outer diameter of the outer peripheral edge of the cutting edge portion is used as a result of repeated experiments.
%, And the same length has a dimension corresponding to 20 to 40% of the length of the cutting edge portion, in the end mill of this result, the cylindrical cutting bottomed hole of the bottom blade surface of the cutting edge portion. Due to the relatively heavy cylindrical tip attached to the, the occurrence of rotational vibration shake is significantly suppressed even at high speed cutting,
As a result, research results were obtained in which chipping of the outer peripheral blade was prevented and excellent cutting performance was exhibited over a long period of time.
【０００５】この発明は、上記の研究結果に基づいてな
されたものであって、切刃部とシャンク部からなり、少
なくとも前記切刃部がＷＣ基超硬合金（以下、超硬合金
という）で構成されたエンドミルにおいて、前記切刃部
の底刃面に円筒状切り込み有底孔が切刃部の長さ方向に
沿って同心に存在し、前記円筒状切り込み有底孔には相
対的に重質の超硬合金で構成された円筒状チップが嵌着
された構造を有し、上記切刃部を、
Ｃｏ：８〜１０質量％、
Ｃｒ3Ｃ2および／またはＶＣ：０．１〜１．５質量％、
必要に応じて（Ｔａ，Ｎｂ）Ｃ：０．１〜１．５質量
％、
ＷＣ：残り、
からなる配合組成を有する圧粉体の焼結体で、上記円筒
状チップを、
Ｃｏ：０．５〜２質量％、
ＷＣ：残り、
からなる配合組成を有する圧粉体の焼結体で構成すると
共に、上記円筒状チップの直径を切刃部の外周刃の外径
の２５〜４５％、同長さを切刃部の長さの２０〜４０％
にそれぞれ相当する寸法としてなる、高速切削加工で外
周刃がすぐれた耐チッピング性を発揮するエンドミルに
特徴を有するものである。The present invention has been made based on the above research results, and is composed of a cutting edge portion and a shank portion, and at least the cutting edge portion is made of WC-based cemented carbide (hereinafter referred to as cemented carbide). In the configured end mill, a cylindrical cutting bottomed hole is concentrically present on the bottom blade surface of the cutting blade portion along the length direction of the cutting blade portion, and the cylindrical cutting bottomed hole is relatively heavy. Has a structure in which a cylindrical tip made of a high-quality cemented carbide is fitted, and the cutting edge portion is made of Co: 8 to 10% by mass, Cr 3 C 2 and / or VC: 0.1 to 1 0.5% by mass, (Ta, Nb) C: 0.1 to 1.5% by mass, if necessary, WC: the rest, a sintered compact of a powder compact having a composition of , Co: 0.5 to 2% by mass, WC: balance, and a sintered compact of a green compact having a compounding composition of In addition, the diameter of the cylindrical tip is 25 to 45% of the outer diameter of the outer peripheral blade of the cutting edge portion, and the same length is 20 to 40% of the length of the cutting edge portion.
The end mill is characterized by excellent chipping resistance of the outer peripheral blade in high-speed cutting, which has dimensions corresponding to the above.
【０００６】以下に、この発明のエンドミルにおいて、
上記の通りに数値限定した理由を説明する。
（ａ） 切刃部の超硬合金のＣｏ量
Ｃｏ成分には、焼結性を向上させ、かつ結合相を形成し
て超硬合金の強度を向上させる作用があるが、その割合
が８質量％未満ではエンドミルに必要な所望の強度を確
保することができず、さらに円筒状チップとの密度差が
崩れて回転振動ぶれが発生し易くなり、一方その割合が
１０質量％を超えると、耐摩耗性が急激に軟化し、摩耗
進行が促進するようになることから、その割合を８〜１
０質量％と定めた。In the end mill of the present invention,
The reason for limiting the numerical values as described above will be described. (A) Co Content of Cemented Carbide at Cutting Edge The Co component has the effects of improving sinterability and forming a binder phase to improve the strength of the cemented carbide, but the proportion is 8 mass. If it is less than 10%, the desired strength required for the end mill cannot be secured, and further the density difference from the cylindrical tip collapses and rotational vibration shake easily occurs. On the other hand, if the ratio exceeds 10% by mass, Since the wear property is suddenly softened and the progress of wear is promoted, the ratio is 8 to 1
It was determined to be 0% by mass.
【０００７】（ｂ） 切刃部の超硬合金のＣｒ3Ｃ2およ
びＶＣ量
これらの成分には、焼結時に結合相を形成するＣｏ中に
固溶した状態で硬質相を形成するＷＣの成長を著しく抑
制して、ＷＣの粒径を平均粒径で、望ましくは０．７μ
ｍ以下とした微粒組織とする作用があるが、この作用は
Ｃｒ3Ｃ2およびＶＣの割合が０．１質量％未満では不充
分となり、一方その割合が１．５％質量を超えると、こ
れが固溶する結合相を硬化し、チッピング発生の原因と
なることから、その割合を０．１〜１．５質量％と定め
た。(B) Cr 3 C 2 and VC content of cemented carbide at the cutting edge These components include WC which forms a hard phase in a solid solution in Co which forms a binder phase during sintering. The grain size of WC is an average grain size, preferably 0.7μ, by suppressing the growth significantly.
There is an effect of forming a fine grain structure of m or less, but this effect becomes insufficient when the ratio of Cr 3 C 2 and VC is less than 0.1% by mass, and when the ratio exceeds 1.5% by mass, The binder phase which is solid-dissolved is hardened and causes chipping, so the proportion thereof is set to 0.1 to 1.5% by mass.
【０００８】（ｃ） 切刃部の超硬合金の（Ｔａ，Ｎ
ｂ）Ｃ量
（Ｔａ，Ｎｂ）Ｃ成分には、実質的に分散相を形成して
高温硬さを向上させ、もって耐摩耗性の一段の向上に寄
与する作用があるので、必要に応じて配合されるが、そ
の割合が０．１質量％未満では前記作用に所望の向上効
果が得られず、一方その割合が１．５％質量を超える
と、チッピングが発生し易くなることから、その割合を
０．１〜１．５質量％と定めた。(C) Cemented carbide (Ta, N
b) C content (Ta, Nb) The C component has a function of substantially forming a dispersed phase to improve high-temperature hardness, and thus contributes to further improvement in wear resistance. If the proportion is less than 0.1% by mass, the desired improvement effect on the above-mentioned action cannot be obtained, while if the proportion exceeds 1.5% by mass, chipping is likely to occur. The ratio was set to 0.1 to 1.5 mass%.
【０００９】（ｄ） 円筒状チップの超硬合金のＣｏ量
円筒状チップは強度を必要としないが、焼結体形成には
０．５質量％以上必要であり、一方その割合が２質量％
を超えると、切刃部との密度差が崩れて回転振動ぶれが
発生し易くなることから、その割合を０．５〜２質量％
と定めた。(D) Co Content of Cemented Carbide of Cylindrical Tip Cylindrical tip does not require strength, but 0.5% by mass or more is required for forming a sintered body, while the ratio is 2% by mass.
When it exceeds, the density difference with the cutting edge portion collapses and rotational vibration shake easily occurs, so the ratio is 0.5 to 2% by mass.
I decided.
【００１０】（ｄ） 円筒状チップの寸法
円筒状チップの寸法は、上記の通り経験的に定められた
ものであり、したがってその直径および長さが上記の範
囲を上下のいずれに外れても切刃部との間の密度差バラ
ンスが崩れて回転振動ぶれが発生するようになることか
ら、その直径を切刃部の外周刃の外径の２５〜４５％、
同長さを切刃部の長さの２０〜４０％にそれぞれ相当す
る寸法と定めた。(D) Dimensions of Cylindrical Tip The dimensions of the cylindrical tip are empirically determined as described above, and therefore, the diameter and length of the cylindrical tip are not limited to above or below the above range. Since the balance of the density difference between the blade portion is lost and the rotational vibration shake is generated, its diameter is 25 to 45% of the outer diameter of the outer peripheral blade of the cutting blade portion,
The same length was defined as a dimension corresponding to 20 to 40% of the length of the cutting edge portion.
【００１１】[0011]
【発明の実施の態様】つぎに、この発明のエンドミルを
実施例により具体的に説明する。原料粉末として、いず
れも０．１〜３μｍの範囲内の所定の平均粒径を有する
ＷＣ粉末、Ｃｒ3 Ｃ2 粉末、ＶＣ粉末、およびＣｏ粉
末、さらに（Ｔａ，Ｎｂ）Ｃ［ＴａＣ／ＮｂＣ＝質量比
で、８０／２０］粉末を用意し、これら原料粉末を、表
１に示される配合組成に配合し、ボールミルで７２時間
湿式混合し、乾燥して、切刃部とシャンク部（以下、エ
ンドミル本体という）形成用混合粉末ａ−１〜ａ−１４
および円筒状チップ形成用混合粉末ｂ−１〜ｂ−４を調
整し、ついで、これらの混合粉末から、それぞれ７５Ｍ
Ｐａの圧力で所定の寸法（直径および長さ）をもったエ
ンドミル本体形成用圧粉体および円筒状チップ形成用圧
粉体（いずれも丸棒形状）に押出プレス成形し、まずこ
れら圧粉体のうちの前記円筒状チップ形成用圧粉体を
１．３Ｐａの真空中、窒素雰囲気中、温度：１３５０〜
１４８０℃の範囲内の所定の温度に１時間保持の条件で
焼結して焼結体とし、一方前記エンドミル本体形成用圧
粉体には、１００Ｐａの減圧窒素雰囲気中、温度：６０
０℃に１時間保持の条件で脱脂した状態で、切刃面形成
面に前記円筒状チップの寸法に対応した寸法の円筒状切
り込み有底孔を同心に形成し、この円筒状切り込み有底
孔に表２に示される組み合わせで前記円筒状チップの焼
結体を篏着し、この状態で前記円筒状チップの焼結体の
焼結条件と同じ条件で焼結して焼結体とし、最終的に研
削加工を施して、それぞれ同じく表２に示される寸法お
よび形状をもった本発明エンドミル１〜１４を製造し
た。BEST MODE FOR CARRYING OUT THE INVENTION Next, the end mill of the present invention will be specifically described with reference to Examples. As the raw material powder, WC powder, Cr 3 C 2 powder, VC powder, and Co powder each having a predetermined average particle size within the range of 0.1 to 3 μm, and (Ta, Nb) C [TaC / NbC = 80/20] powder was prepared in a mass ratio, and these raw material powders were blended to the blending composition shown in Table 1, wet-mixed for 72 hours in a ball mill and dried to prepare a cutting edge portion and a shank portion (hereinafter, End mill body) Mixed powder for formation a-1 to a-14
And mixed powders b-1 to b-4 for forming a cylindrical tip are prepared, and then 75M each from these mixed powders.
At the pressure of Pa, the end mill body forming green compact and the cylindrical tip forming green compact (both of which are in the shape of a round bar) having predetermined dimensions (diameter and length) are extrusion-pressed, and then these green compacts are first formed. Of the above-mentioned green compact for forming a cylindrical tip in a vacuum of 1.3 Pa, in a nitrogen atmosphere, at a temperature of 1350.
Sintering is performed by sintering at a predetermined temperature within a range of 1480 ° C. for 1 hour, while the end mill body-forming green compact is used in a reduced pressure nitrogen atmosphere of 100 Pa at a temperature of 60.
In the state of degreasing under the condition of holding at 0 ° C for 1 hour, a cylindrical notched bottomed hole having a size corresponding to the size of the cylindrical tip is concentrically formed on the cutting edge surface forming surface, and the cylindrical notched bottomed hole is formed. The sintered bodies of the cylindrical chips are bonded together in the combinations shown in Table 2, and in this state, they are sintered under the same conditions as the sintering conditions of the sintered bodies of the cylindrical chips to obtain a sintered body. The end mills 1 to 14 of the present invention having the same dimensions and shapes as shown in Table 2 were manufactured.
【００１２】また、比較の目的で、表３に示される通り
上記円筒状切り込み有底孔の形成を行なわず、したがっ
て前記円筒状切り込み有底孔への円筒状チップの篏着を
行なわない以外は上記の本発明エンドミル１〜１４の製
造条件と同じ条件で比較エンドミル１〜１４をそれぞれ
製造した。For the purpose of comparison, as shown in Table 3, except that the above-mentioned cylindrical notched bottomed hole is not formed, and therefore the cylindrical tip is not attached to the cylindrical notched bottomed hole. Comparative end mills 1 to 14 were manufactured under the same conditions as the manufacturing conditions of the present invention end mills 1 to 14, respectively.
【００１３】つぎに、上記の各種のエンドミルについ
て、被削材として、幅：４００ｍｍを有するＮＡＫ８０
（硬さ：ＨＲＣ４０）の板材を用い、表４に示される条
件で高速肩削り加工を行い、エンドミルの外周刃の逃げ
面摩耗幅がそれぞれ表４に示される使用目安とされる値
に至るまでの切削長を測定した。これらの測定結果を表
４，５にそれぞれ平均値で示した。Next, regarding the above various end mills, NAK80 having a width of 400 mm as a work material
Using a (hardness: HRC40) plate material, perform high-speed shoulder milling under the conditions shown in Table 4 until the flank wear width of the outer peripheral edge of the end mill reaches the value shown in Table 4 as a usage guide. The cutting length was measured. The results of these measurements are shown in Tables 4 and 5 as average values.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】[0016]
【表３】 [Table 3]
【００１７】[0017]
【表４】 [Table 4]
【００１８】[0018]
【表５】 [Table 5]
【００１９】[0019]
【発明の効果】表１〜５に示される結果から、本発明エ
ンドミル１〜１４は、いずれも切刃部先端部における相
対的に重質の円筒状チップの篏着によって高速切削でも
自体の回転振動ぶれが著しく抑制されることから、外周
刃のチッピング発生がなくなり、すぐれた耐摩耗性を発
揮するのに対して、前記円筒状チップの篏着がない比較
エンドミル１〜１４においては、いずれも高速切削加工
では回転振動ぶれが発生し、これが原因で外周刃にチッ
ピングが発生し易くなり、比較的短時間で使用寿命に至
ることが明らかである。上述のように、この発明のエン
ドミルは、通常の条件での切削加工は勿論のこと、高速
切削加工でも外周刃がすぐれた耐チッピング性を発揮
し、長期に亘ってすぐれた切削性能を示すものであるか
ら、切削加工の省力化および省エネ化、さらに低コスト
化に十分満足に対応することができるものである。From the results shown in Tables 1 to 5, all of the end mills 1 to 14 of the present invention rotate themselves even at high speed cutting due to the relatively heavy cylindrical tip attached at the tip of the cutting blade. Since the vibration shake is remarkably suppressed, chipping of the outer peripheral blade is eliminated and excellent wear resistance is exhibited, while in the comparative end mills 1 to 14 in which the cylindrical tip is not attached, It is clear that in high-speed cutting, rotational vibration shake occurs, which causes chipping of the outer peripheral blade to easily occur, and the service life is reached in a relatively short time. As described above, the end mill of the present invention exhibits excellent chipping resistance of the outer peripheral blade not only for cutting under normal conditions but also for high-speed cutting, and exhibits excellent cutting performance for a long period of time. Therefore, it is possible to satisfactorily deal with labor saving and energy saving of the cutting process and further cost reduction.
【図１】（ａ）は本発明エンドミルを例示する概略側面
図、（ｂ）は同概略正面図、および（ｃ）は同概略縦断
面図である。1A is a schematic side view illustrating an end mill of the present invention, FIG. 1B is a schematic front view thereof, and FIG. 1C is a schematic vertical sectional view thereof.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡田 一樹 茨城県結城郡石下町大字古間木1511番地 三菱マテリアル株式会社筑波製作所内 (72)発明者 高橋 慧 茨城県結城郡石下町大字古間木1511番地 三菱マテリアル株式会社筑波製作所内 (72)発明者 谷内 俊之 茨城県結城郡石下町大字古間木1511番地 三菱マテリアル株式会社筑波製作所内 Ｆターム(参考） 3C022 KK03 3C046 FF32 FF39 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Kazuki Okada 1511 Furumagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works (72) Inventor Kei Takahashi 1511 Furumagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works (72) Inventor Toshiyuki Taniuchi 1511 Furumagi, Ishishita-cho, Yuki-gun, Ibaraki Prefecture Mitsubishi Materials Corporation Tsukuba Works F-term (reference) 3C022 KK03 3C046 FF32 FF39
Claims (2)
も前記切刃部が炭化タングステン基超硬合金で構成され
た超硬合金製スクエアエンドミルにおいて、 前記切刃部の底刃面に円筒状切り込み有底孔が切刃部の
長さ方向に沿って同心に存在し、前記円筒状切り込み有
底孔には相対的に重質の炭化タングステン基超硬合金で
構成された円筒状チップが嵌着された構造を有し、 上記切刃部を、 Ｃｏ：８〜１０質量％、 炭化クロムおよび／または炭化バナジウム：０．１〜
１．５質量％、 炭化タングステン：残り、 からなる配合組成を有する圧粉体の焼結体で、上記円筒
状チップを、 Ｃｏ：０．５〜２質量％、 炭化タングステン：残り、 からなる配合組成を有する圧粉体の焼結体で構成すると
共に、 上記円筒状チップの直径を切刃部の外周刃の外径の２５
〜４５％、同長さを切刃部の長さの２０〜４０％にそれ
ぞれ相当する寸法としたこと、を特徴とする高速切削加
工で外周刃がすぐれた耐チッピング性を発揮する超硬合
金製スクエアエンドミル。1. A cemented carbide square end mill comprising a cutting edge portion and a shank portion, at least the cutting edge portion being made of a tungsten carbide based cemented carbide, wherein a cylindrical cut is made on a bottom edge surface of the cutting edge portion. A bottomed hole exists concentrically along the length direction of the cutting edge portion, and a cylindrical tip made of a relatively heavy tungsten carbide based cemented carbide is fitted into the cylindrical cut bottomed hole. The above-mentioned cutting edge part is made into: Co: 8-10 mass%, chromium carbide and / or vanadium carbide: 0.1
1.5% by mass, tungsten carbide: balance, a sintered compact of a powder compact having a compounding composition of the above cylindrical tip, Co: 0.5 to 2% by mass, tungsten carbide: balance, It is composed of a sintered compact of a green compact having a composition, and the diameter of the cylindrical tip is 25 times the outer diameter of the outer peripheral blade of the cutting edge portion.
.About.45%, and the same length is set to a dimension corresponding to 20% to 40% of the length of the cutting edge portion, respectively. Made square end mill.
も前記切刃部が炭化タングステン基超硬合金で構成され
た超硬合金製スクエアエンドミルにおいて、 前記切刃部の底刃面に円筒状切り込み有底孔が切刃部の
長さ方向に沿って同心に存在し、前記円筒状切り込み有
底孔には相対的に重質の炭化タングステン基超硬合金で
構成された円筒状チップが嵌着された構造を有し、 上記切刃部を、 Ｃｏ：８〜１０質量％、 炭化クロムおよび／または炭化バナジウム：０．１〜
１．５質量％、 ＴａとＮｂの複合炭化物：０．１〜１．５質量％、 炭化タングステン：残り、 からなる配合組成を有する圧粉体の焼結体で、上記円筒
状チップを、 Ｃｏ：０．５〜２質量％、 炭化タングステン：残り、 からなる配合組成を有する圧粉体の焼結体で構成すると
共に、 上記円筒状チップの直径を切刃部の外周刃の外径の２５
〜４５％、同長さを切刃部の長さの２０〜４０％にそれ
ぞれ相当する寸法としたこと、を特徴とする高速切削加
工で外周刃がすぐれた耐チッピング性を発揮する超硬合
金製スクエアエンドミル。2. A cemented carbide square end mill comprising a cutting edge portion and a shank portion, at least the cutting edge portion being made of a tungsten carbide based cemented carbide, wherein a cylindrical cut is made on a bottom edge surface of the cutting edge portion. A bottomed hole exists concentrically along the length direction of the cutting edge portion, and a cylindrical tip made of a relatively heavy tungsten carbide based cemented carbide is fitted into the cylindrical cut bottomed hole. The above-mentioned cutting edge part is made into: Co: 8-10 mass%, chromium carbide and / or vanadium carbide: 0.1
1.5 mass%, composite carbide of Ta and Nb: 0.1 to 1.5 mass%, tungsten carbide: balance, a sintered compact of a powder compact having the following composition: : 0.5 to 2% by mass, tungsten carbide: balance, and a sintered compact of a powder compact having a composition of: and the diameter of the cylindrical tip is 25 times the outer diameter of the outer peripheral blade of the cutting edge portion.
.About.45%, and the same length is set to a dimension corresponding to 20% to 40% of the length of the cutting edge portion, respectively. Made square end mill.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001265450A JP4154643B2 (en) | 2001-09-03 | 2001-09-03 | Cemented carbide square end mill with excellent chipping resistance with high-speed cutting. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001265450A JP4154643B2 (en) | 2001-09-03 | 2001-09-03 | Cemented carbide square end mill with excellent chipping resistance with high-speed cutting. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003071627A true JP2003071627A (en) | 2003-03-12 |
| JP4154643B2 JP4154643B2 (en) | 2008-09-24 |
Family
ID=19091909
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001265450A Expired - Fee Related JP4154643B2 (en) | 2001-09-03 | 2001-09-03 | Cemented carbide square end mill with excellent chipping resistance with high-speed cutting. |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4154643B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009154251A (en) * | 2007-12-27 | 2009-07-16 | Osg Corp | Cemented carbide rotary tool |
-
2001
- 2001-09-03 JP JP2001265450A patent/JP4154643B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009154251A (en) * | 2007-12-27 | 2009-07-16 | Osg Corp | Cemented carbide rotary tool |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4154643B2 (en) | 2008-09-24 |
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