JP4155778B2 - Cemented carbide throwaway cutting tip that provides excellent wear resistance in high-speed cutting - Google Patents
Cemented carbide throwaway cutting tip that provides excellent wear resistance in high-speed cutting Download PDFInfo
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Description
【０００１】
【発明の属する技術分野】
この発明は、特に超硬合金の硬質相が強度の低下なく、すぐれた高温硬さと耐熱性を有し、したがって高熱発生を伴なう高速切削加工で、すぐれた耐摩耗性を発揮する超硬合金製スローアウエイ式切削チップ（以下、単に切削チップと云う）に関するものである。
【０００２】
【従来の技術】
従来、一般に、切削チップが、バイトの先端部に着脱自在に取り付けて各種の鋼や鋳鉄などの被削材の旋削加工や平削り加工を行なうのに用いたり、エンドミル本体に着脱自在に取り付けて、前記被削材の面削加工や溝加工、さらに肩加工などに用いられることは良く知られるところである。
【０００３】
さらに、上記の切削チップが、例えば原料粉末として、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、炭化クロム（以下、Ｃｒ3Ｃ2で示す）粉末、炭化バナジウム（以下、ＶＣで示す）粉末、およびＣｏ粉末を用い、これら原料粉末を所定の配合組成に配合し、湿式混合し、乾燥した後、例えば１００ＭＰａの圧力で所定形状の圧粉体にプレス成形し、この圧粉体を、雰囲気圧力を１．３〜１３．３Ｐａとした真空雰囲気中、１３５０〜１４８０℃の範囲内の所定の温度に昇温し、この昇温温度に１〜２時間保持後、冷却して、Ｃｒ（Ｃｒ3Ｃ2）および／またはＶ（ＶＣ）がＣｏ中に固溶してなる結合相とＷＣの硬質相からなる超硬合金で構成され、かつ研削加工にて所定の形状とすることにより製造されることも知られている（例えば、特許文献１参照）。
【０００４】
【特許文献１】
特開昭６１−１２８４７号公報
【０００５】
【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、上記の従来切削チップにおいては、これを高速切削加工に用いると、特に超硬合金における硬質相の高温硬さおよび耐熱性不足が原因で、摩耗進行が著しく促進されるようになることから、比較的短時間で使用寿命に至るのが現状である。
【０００６】
【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、すぐれた耐摩耗性を発揮する切削チップを開発すべく、特に上記の従来切削チップに着目し、研究を行った結果、
（ａ）通常、従来の原料粉末としてのＷＣ粉末は、高純度を意図して製造されているため、焼結後の超硬合金の硬質相を構成するＷＣにおける不純物である窒素および酸素の含有量は、前記硬質相の中心部をオージェ電子分光分析装置を用いて測定した値で、
酸素（Ｏ）：０．００１〜０．０５％、
窒素（Ｎ）：０．００１〜０．０３％、
であるのが一般的であること。
【０００７】
（ｂ）一般に、上記の従来高純度ＷＣ粉末は、原料粉末としてＷＯ3粉末を用い、これに還元粉末として所定量のカーボンブラックを配合し、混合した後、この混合粉末を９５０〜１０５０℃に加熱し、窒素気流中で所定時間保持の条件で還元処理を行い、ついで加熱温度を１１５０〜１２５０℃とすると共に、前記窒素気流を水素気流に変えて所定時間保持の条件で炭化処理を行うことにより製造されているが、この従来高純度ＷＣ粉末の製造において、還元処理の窒素気流中および炭化処理の水素気流中に所定割合、望ましくは５〜１５容量％の割合でＣＯガスを配合すると、製造されたＷＣ粉末中の酸素含有量および窒素含有量が上昇するようになり、前記のＣＯガスの５〜１５容量％の配合で、製造されたＷＣ粉末は、
酸素（Ｏ）：０．２〜０．６％、
窒素（Ｎ）：０．１〜０．２５％、
を含有するようになること。
【０００８】
（ｃ）この結果の高酸素高窒素含有のＷＣ粉末を原料粉末として用いて製造された切削チップにおいては、これを構成する超硬合金の硬質相は、その中心部をオージェ電子分光分析装置を用いて測定した値で、前記高酸素高窒素含有のＷＣ粉末と同じＯ：０．２〜０．６％、Ｎ：０．１〜０．２５％、の含有量を示し、この結果前記含有量のＯによってすぐれた高温硬さと耐熱性を具備し、一方前記Ｏ含有によって硬質相の強度は低下するようになるが、このＯ含有による強度低下を前記含有量のＮによって抑制することから、高純度硬質相と同等の高強度が保持され、したがってこの超硬合金で構成された切削チップは、高熱発生を伴なう高速切削加工でもすぐれた耐摩耗性を発揮し、長期に亘ってすぐれた切削性能を示すこと。
以上（ａ）〜（ｃ）に示される研究結果を得たのである。
【０００９】
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、いずれも結合相形成成分として、
Ｃｏ：４〜１２％、
Ｃｒおよび／またはＶ：０．１〜２％、
を含有し、残りの硬質相が酸素（Ｏ）および窒素（Ｎ）を固溶含有するＷＣからなる組成を有し、かつ前記硬質相のＯおよびＮ含有量が、前記硬質相の中心部をオージェ電子分光分析装置を用いて測定した値で、
Ｏ：０．２〜０．６％、
Ｎ：０．１〜０．２５％、
である超硬合金で構成してなる、高速切削加工ですぐれた耐摩耗性を発揮する切削チップに特徴を有するものである。
【００１０】
以下に、この発明の切削チップにおいて、これを構成する超硬合金の組成を上記の通りに限定した理由を説明する。
（１） Ｃｏ含有量
結合相形成成分としてのＣｏ含有量が４％未満では所望の強度および靭性を確保することができず、一方Ｃｏ含有量が１２％を超えると熱塑性変形を起し易くなり、偏摩耗の進行が促進するようになることから、Ｃｏ含有量を４〜１２％と定めた。
【００１１】
（２） Ｃｒおよび／またはＶ含有量
これらの成分には、結合相を形成するＣｏ中に固溶した状態で硬質相の成長を著しく抑制して、これ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とする作用があるが、この作用はＣｒおよびＶ成分の含有量が０．１％未満では不充分となり、一方その含有量が２％を超えると、これらの成分が炭化物として析出し、強度および靭性を低下させるようになることから、その含有量を０．１〜２％と定めた。
【００１２】
（３） 硬質相のＯ含有量
超硬合金の硬質相におけるＯ含有量が０．２％未満では、所望のすぐれた高温硬さと耐熱性を確保することができないので、前記硬質相を構成するＷＣ粉末の製造時に、還元処理の窒素気流中および炭化処理の水素気流中に配合するＣＯガスの割合を調整して０．２％以上含有させ、すぐれた高温硬さと耐熱性を確保して、高熱発生の高速切削加工でもすぐれた耐摩耗性を発揮するようにするが、一方その含有量が０．６％を超えるとＮ含有によっても硬質相自体の強度低下を阻止することができず、この結果すくい面と逃げ面の交わる切刃稜線部にチッピング（微小欠け）が発生し易くなり、使用寿命の短命化をもたらすことから、その含有量を０．２〜０．６％と定めた。
【００１３】
（４） 硬質相のＮ含有量
また、Ｎ含有量が０．１％未満では、上記のＯ含有による強度低下を完全に阻止することができないので、原料粉末として用いられるＷＣ粉末の製造に際して、還元処理の窒素気流中および炭化処理の水素気流中に配合するＣＯガスの割合を調整して０．１％以上含有するようにするが、一方その含有量が０．２５％を超えると上記のＯ含有によってもたらされる高温硬さと耐熱性の向上効果が低下し、所望の高温硬さと耐熱性を確保することができなくなり、摩耗進行が著しく促進され、使用寿命短命化の原因となることから、その含有量を０．１〜０．２５％と定めた。
【００１４】
【発明の実施の態様】
つぎに、この発明の切削チップを実施例により具体的に説明する。
原料粉末として、平均粒径：０．５μｍを有するＷＯ3粉末、および同０．２μｍのカーボンブラックを用意し、まずこれら原料粉末を、カーボンブラック：１７％、ＷＯ3粉末：残り、の割合に配合し、湿式ボールミルでアセトンを加えて３時間混合し、減圧乾燥した後、よくほぐした状態でカーボンボートに充填した後、この混合粉末を９５０〜１０５０℃に加熱し、ＣＯガスを５〜１５容量％の範囲内の所定の割合で配合してなる窒素−ＣＯ混合気流中で３時間保持の条件で還元処理を行い、ついで加熱温度を１１５０〜１２５０℃とすると共に、前記窒素−ＣＯ混合気流を同じくＣＯガスを５〜１５容量％の範囲内の所定の割合で配合してなる水素−ＣＯ混合気流に変えて３時間保持の条件で炭化処理を行い、最終的に粒度調整を行うことにより、表１に示される窒素および酸素を含有し、かつ平均粒径をもった本発明切削チップ製造用原料粉末としてのＷＣ粉末（以下、本発明原料ＷＣ粉末という）Ａ〜Ｇをそれぞれ製造した。
【００１５】
また、比較の目的で、還元処理の反応雰囲気を窒素気流、炭化処理の反応雰囲気を水素気流とする以外は、同一の条件で、同じく表１に示される窒素および酸素含有量、並びに平均粒径の従来切削チップ製造用原料粉末としてのＷＣ粉末（以下、従来原料ＷＣ粉末という）ａ〜ｇをそれぞれ製造した。
【００１６】
ついで、上記の本発明原料ＷＣ粉末Ａ〜Ｇおよび従来原料ＷＣ粉末ａ〜ｇのそれぞれに、平均粒径：１．２μｍのＣｏ粉末、同１．８μｍのＶＣ粉末、および同２．３μｍのＣｒ3Ｃ2粉末を表２に示される割合に配合し、ボールミルで７２時間湿式混合し、減圧乾燥し、さらにワックスと溶剤を加えて１時間混和した後、１００ＭＰａの圧力で所定形状の圧粉体にプレス成形し、この圧粉体を、１．３Ｐａの真空雰囲気中、１３８０〜１４８０℃の範囲内の所定の温度に１時間保持後、炉冷の条件で焼結し、この結果得られた超硬合金素材に研削加工を施して、それぞれ表２に示されるチップ形状およびホーニング量の本発明切削チップ１〜７および従来切削チップ１〜７をそれぞれを製造した。
【００１７】
この結果得られた本発明切削チップ１〜７および従来切削チップ１〜７について、オージェ電子分光分析装置を用い、これを構成する超硬合金における任意５個の硬質相の中心部のＯ含有量およびＮ含有量を測定し、この結果を表２に平均値で示した。
また、表２には、これらの切削チップを構成する超硬合金の任意断面における硬質相の平均粒径を走査型電子顕微鏡を用いて測定した結果も示した。
さらに、同じく上記超硬合金のＣｏ、Ｃｒ、およびＶの含有量を測定したところ、配合組成と実質的に同じ値を示した。
【００１８】
つぎに、上記の各種切削チップのうち、ＩＳＯ・ＳＰＧＮ１２０３０４のチップ形状を有する本発明切削チップ１，２および従来切削チップ１，２については、いずれも工具鋼製バイトの先端部に固定治具にてネジ止めした状態で、
被削材：ＪＩＳ・ＳＣＭ４４０の丸棒（直径：２００ｍｍ）、
切削速度：１５０ｍ／ｍｉｎ．、
切り込み：１．２ｍｍ、
送り：０．２ｍｍ／ｒｅｖ．、
の条件で合金鋼丸棒の端面を乾式で、かつ高速で連続切削加工する切削加工試験を行ない、切刃部における逃げ面摩耗幅が０．２ｍｍに達するまでの切削長を測定した。
【００１９】
また、ＩＳＯ・ＤＣＭＷ１１Ｔ３０８のチップ形状を有する本発明切削チップ３，４および従来切削チップ３，４については、同じく工具鋼製バイトの先端部に固定治具にてネジ止めした状態で、
被削材：ＪＩＳ・ＳＵＳ３０４の丸棒（直径：１２ｍｍ×長さ：１５ｍｍ）、
切削速度：２００ｍ／ｍｉｎ．、
切り込み：３ｍｍ、
送り：０．０３ｍｍ／ｒｅｖ．、
の条件でステンレス鋼丸棒の一方端部を湿式で、かつ高速で端面から長さ方向１０ｍｍまでを直径：６ｍｍに縮径する切削加工試験を行ない、同じく切刃部における逃げ面摩耗幅が０．２ｍｍに達するまでの丸棒端部加工数を測定した。
【００２０】
さらに、ＩＳＯ・ＴＣＧＴ０６０１０２のチップ形状を有する本発明切削チップ５〜７および従来切削チップ５〜７については、同じく工具鋼製バイトの先端部に固定治具にてネジ止めした状態で、
被削材：ＪＩＳ・ＳＣＭ４４０の管材（外径：９ｍｍ×内径：５ｍｍ×長さ：２８ｍｍ）、
切削速度：１００ｍ／ｍｉｎ．、
切り込み：０．５ｍｍ、
送り：０．０５ｍｍ／ｒｅｖ．、
の条件で合金鋼管材の一方端部の内面を湿式で、かつ高速で端面から長さ方向２０ｍｍまでを拡径（内径：６ｍｍ）する切削加工試験を行ない、同じく切刃部における逃げ面摩耗幅が０．２ｍｍに達するまでの管材端部加工数を測定した。
これらの切削加工試験結果を表２に示した。
【００２１】
【表１】
【表２】
【発明の効果】
表１，２に示される結果から、本発明切削チップ１〜７は、いずれもこれを構成する超硬合金の硬質相のＯおよびＮの含有量が相対的に高く、前記硬質相によってすぐれた高温硬さと耐熱性が確保されることから、高熱発生を伴なう高速切削加工でも、すぐれた耐摩耗性を発揮するのに対して、前記硬質相のＯおよびＮの含有量が相対的に低い従来切削チップ１〜７においては、いずれも超硬合金を構成する硬質相の高温硬さおよび耐熱性不足が原因で、高速切削加工では摩耗進行が促進し、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、この発明の切削チップは、通常の条件での切削加工は勿論のこと、高速切削加工でもすぐれた耐摩耗性を長期に亘って発揮するものであるから、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。[0001]
BACKGROUND OF THE INVENTION
The present invention provides a cemented carbide that exhibits excellent wear resistance in high-speed cutting with high heat generation. The present invention relates to an alloy throwaway cutting tip (hereinafter simply referred to as a cutting tip).
[0002]
[Prior art]
Conventionally, generally, a cutting tip is detachably attached to the tip of a cutting tool and used for turning and planing of various materials such as steel and cast iron, or detachably attached to an end mill body. It is well known that it is used for chamfering, grooving, and shoulder machining of the work material.
[0003]
Further, the above-mentioned cutting tip is, for example, as a raw material powder, WC powder, chromium carbide (hereinafter referred to as Cr 3 C 2 ) powder having a predetermined average particle diameter in the range of 0.1 to 3 μm, vanadium carbide. Using powder and Co powder (hereinafter referred to as VC), these raw material powders are blended into a predetermined blending composition, wet-mixed, dried, and then pressed into a compact of a predetermined shape, for example, at a pressure of 100 MPa. The green compact was heated to a predetermined temperature within a range of 1350 to 1480 ° C. in a vacuum atmosphere with an atmospheric pressure of 1.3 to 13.3 Pa, and held at this temperature rising temperature for 1 to 2 hours. Cooling, Cr (Cr 3 C 2 ) and / or V (VC) is composed of a cemented carbide composed of a binder phase in which Co is dissolved in Co and a hard phase of WC, and predetermined by grinding. Can also be manufactured by making It is known (see, for example, Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 61-12847
[Problems to be solved by the invention]
On the other hand, there is a strong demand for labor saving and energy saving of cutting work and cost reduction in recent years, and along with this, cutting performance tends to be performed at a high speed in combination with high performance of cutting equipment. In the above conventional cutting tip, if this is used for high-speed cutting, the progress of wear will be significantly accelerated due to the high-temperature hardness and heat resistance of the hard phase, especially in cemented carbide. At present, the service life is reached in a short time.
[0006]
[Means for Solving the Problems]
In view of the above, the inventors of the present invention have developed a cutting tip that exhibits excellent wear resistance in high-speed cutting processing. ,
(A) Usually, WC powder as a conventional raw material powder is manufactured with the intention of high purity, and therefore contains nitrogen and oxygen which are impurities in WC constituting the hard phase of cemented carbide after sintering. The amount is a value obtained by measuring the central portion of the hard phase using an Auger electron spectrometer.
Oxygen (O): 0.001 to 0.05%,
Nitrogen (N): 0.001 to 0.03%,
It is common to be.
[0007]
(B) In general, the above conventional high purity WC powder uses WO 3 powder as a raw material powder, and a predetermined amount of carbon black as a reducing powder is mixed and mixed, and then the mixed powder is heated to 950 to 1050 ° C. Heating and performing a reduction treatment under a condition of holding in a nitrogen stream for a predetermined time, then setting the heating temperature to 1150 to 1250 ° C., and changing the nitrogen stream into a hydrogen stream and performing a carbonization treatment under a condition of holding for a predetermined time In the production of this conventional high-purity WC powder, when CO gas is blended in a predetermined ratio, preferably 5 to 15% by volume, in a nitrogen stream of reduction treatment and a hydrogen stream of carbonization treatment, Oxygen content and nitrogen content in the produced WC powder are increased, and the produced WC powder with a blend of 5 to 15% by volume of the CO gas is
Oxygen (O): 0.2-0.6%
Nitrogen (N): 0.1-0.25%,
To come to contain.
[0008]
(C) In the cutting tip manufactured using the resulting WC powder containing high oxygen and nitrogen as the raw material powder, the hard phase of the cemented carbide constituting the cutting tip has an Auger electron spectroscopy analyzer at the center. The value measured using the same O: 0.2 to 0.6%, N: 0.1 to 0.25% as the WC powder containing high oxygen and nitrogen content, and as a result, the content It has excellent high-temperature hardness and heat resistance due to the amount of O, while the strength of the hard phase decreases due to the inclusion of O, since the strength decrease due to the inclusion of O is suppressed by the content of N, High strength equivalent to that of high purity hard phase is maintained. Therefore, cutting tips made of this cemented carbide show excellent wear resistance even during high-speed cutting with high heat generation, and are excellent for a long time. Show cutting performance.
The research results shown in (a) to (c) above were obtained.
[0009]
This invention was made based on the above research results, and as a binder phase forming component,
Co: 4-12%,
Cr and / or V: 0.1 to 2%,
And the remaining hard phase is composed of WC containing oxygen (O) and nitrogen (N) as a solid solution, and the O and N content of the hard phase is the center of the hard phase. A value measured using an Auger electron spectrometer,
O: 0.2-0.6%
N: 0.1-0.25%
It is characterized by a cutting tip that is made of a cemented carbide and exhibits excellent wear resistance in high-speed cutting.
[0010]
The reason why the composition of the cemented carbide constituting the cutting tip of the present invention is limited as described above will be described below.
(1) Co content If the Co content as the binder phase forming component is less than 4%, the desired strength and toughness cannot be ensured. On the other hand, if the Co content exceeds 12%, thermoplastic deformation tends to occur. Since the progress of uneven wear is promoted, the Co content is determined to be 4 to 12%.
[0011]
(2) Cr and / or V content In these components, the growth of the hard phase is remarkably suppressed in the state of being dissolved in Co forming the binder phase, and the particle size of this component is desirably an average particle size. Has the effect of forming a fine-grained structure of 0.7 μm or less, but this effect is insufficient when the content of Cr and V components is less than 0.1%, while when the content exceeds 2%, these effects Since the components are precipitated as carbides and the strength and toughness are reduced, the content is determined to be 0.1 to 2%.
[0012]
(3) O content of hard phase If the O content in the hard phase of the cemented carbide is less than 0.2%, the desired excellent high temperature hardness and heat resistance cannot be ensured, so the hard phase is constituted. During production of WC powder, the proportion of CO gas blended in the nitrogen stream of reduction treatment and the hydrogen stream of carbonization treatment is adjusted to contain 0.2% or more, ensuring excellent high temperature hardness and heat resistance, Even if high heat generation high-speed cutting process, it shows excellent wear resistance, but if its content exceeds 0.6%, it cannot prevent strength reduction of the hard phase itself even if it contains N, As a result, chipping (minute chipping) is likely to occur at the cutting edge ridge line where the rake face and flank face intersect, and the service life is shortened. Therefore, the content is determined to be 0.2 to 0.6%. .
[0013]
(4) N content of hard phase Also, if the N content is less than 0.1%, the strength reduction due to the O content cannot be completely prevented, so in the production of WC powder used as a raw material powder, The ratio of the CO gas to be blended in the nitrogen stream of reduction treatment and the hydrogen stream of carbonization treatment is adjusted so as to contain 0.1% or more. On the other hand, if the content exceeds 0.25%, The effect of improving the high temperature hardness and heat resistance caused by the inclusion of O is reduced, it becomes impossible to ensure the desired high temperature hardness and heat resistance, the progress of wear is remarkably promoted, and the service life is shortened, The content was determined to be 0.1 to 0.25%.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the cutting tip of the present invention will be specifically described with reference to examples.
WO 3 powder having an average particle size of 0.5 μm and carbon black of 0.2 μm were prepared as raw material powders. First, these raw material powders were mixed in a ratio of carbon black: 17%, WO 3 powder: remaining. After blending, adding acetone with a wet ball mill and mixing for 3 hours, drying under reduced pressure, and filling in a carbon boat in a well-unraveled state, this mixed powder is heated to 950-1050 ° C., and the CO gas is changed to 5-15. Reduction treatment is performed under the condition of holding for 3 hours in a nitrogen-CO mixed gas stream blended at a predetermined ratio within a volume% range, and then the heating temperature is set to 1150 to 1250 ° C., and the nitrogen-CO mixed gas stream Is changed to a hydrogen-CO mixed gas stream in which CO gas is blended at a predetermined ratio in the range of 5 to 15% by volume, and carbonization is performed under the condition of holding for 3 hours, and finally the particle size is adjusted. To produce WC powders (hereinafter referred to as the present invention raw material WC powder) A to G as raw material powders for production of the present invention having nitrogen and oxygen as shown in Table 1 and having an average particle diameter. did.
[0015]
For comparison purposes, the nitrogen and oxygen contents shown in Table 1 and the average particle diameter are the same under the same conditions except that the reaction atmosphere for the reduction treatment is a nitrogen stream and the reaction atmosphere for the carbonization treatment is a hydrogen stream. WC powders (hereinafter referred to as conventional raw material WC powders) a to g as raw material powders for manufacturing conventional cutting chips were manufactured.
[0016]
Next, the above-mentioned raw material WC powders A to G and the conventional raw material WC powders a to g are respectively mixed with an average particle size: 1.2 μm Co powder, 1.8 μm VC powder, and 2.3 μm Cr. 3 C 2 powder is blended in the proportions shown in Table 2, wet mixed with a ball mill for 72 hours, dried under reduced pressure, further mixed with wax and solvent for 1 hour, and then pressed into a compact with a predetermined shape at a pressure of 100 MPa. The green compact was pressed at a predetermined temperature within a range of 1380 to 1480 ° C. for 1 hour in a 1.3 Pa vacuum atmosphere, and then sintered under furnace cooling conditions. The cemented carbide material was ground to produce the present cutting tips 1 to 7 and the conventional cutting tips 1 to 7 having the chip shapes and honing amounts shown in Table 2, respectively.
[0017]
About this invention cutting tip 1-7 obtained as a result, and conventional cutting tip 1-7, using an Auger electron spectroscopy analyzer, O content of the center part of the arbitrary five hard phases in the cemented carbide which comprises this The N content was measured, and the results are shown in Table 2 as average values.
Table 2 also shows the results of measuring the average particle size of the hard phase in an arbitrary cross section of the cemented carbide constituting these cutting tips using a scanning electron microscope.
Further, when the contents of Co, Cr, and V of the cemented carbide were measured, the values were substantially the same as the blend composition.
[0018]
Next, among the various cutting tips described above, the cutting tips 1 and 2 having the ISO / SPGN120304 tip shape and the conventional cutting tips 1 and 2 are both fixed to the tip of the tool steel cutting tool. With the screw
Work material: JIS / SCM440 round bar (diameter: 200 mm),
Cutting speed: 150 m / min. ,
Cutting depth: 1.2mm,
Feed: 0.2 mm / rev. ,
A cutting test was conducted in which the end face of the alloy steel round bar was dry-processed and continuously cut at high speed under the conditions described above, and the cutting length until the flank wear width at the cutting edge reached 0.2 mm was measured.
[0019]
In addition, for the present invention cutting tips 3 and 4 and the conventional cutting tips 3 and 4 having a chip shape of ISO · DCMW11T308, in the state of being screwed to the tip of the tool steel tool with a fixing jig,
Work material: JIS / SUS304 round bar (diameter: 12 mm x length: 15 mm),
Cutting speed: 200 m / min. ,
Incision: 3mm,
Feed: 0.03 mm / rev. ,
Under the conditions described above, a cutting test was performed in which one end of the stainless steel round bar was wet and the diameter from the end surface to 10 mm in the length direction was reduced to 6 mm, and the flank wear width at the cutting edge was zero. The number of round bar ends processed to reach 2 mm was measured.
[0020]
Further, for the present cutting tips 5 to 7 and the conventional cutting tips 5 to 7 having the ISO / TCGT060102 tip shape, in a state where they are screwed to the tip of the tool steel tool with a fixing jig,
Work material: JIS / SCM440 tube (outer diameter: 9 mm x inner diameter: 5 mm x length: 28 mm),
Cutting speed: 100 m / min. ,
Cutting depth: 0.5mm,
Feed: 0.05 mm / rev. ,
Under the conditions described above, a cutting test was conducted in which the inner surface of one end portion of the alloy steel pipe material was wet and expanded from the end surface to the length direction of 20 mm (inner diameter: 6 mm) at high speed. The number of processed tube ends was measured until it reached 0.2 mm.
These cutting test results are shown in Table 2.
[0021]
[Table 1]
[Table 2]
【The invention's effect】
From the results shown in Tables 1 and 2, the cutting chips 1 to 7 of the present invention have a relatively high content of O and N in the hard phase of the cemented carbide constituting this, and were excellent by the hard phase. Since high-temperature hardness and heat resistance are ensured, even in high-speed cutting with high heat generation, excellent wear resistance is exhibited, whereas the O and N contents of the hard phase are relatively In the low conventional cutting tips 1-7, the progress of wear is accelerated in the high-speed cutting process due to the lack of high-temperature hardness and heat resistance of the hard phase constituting the cemented carbide, and the service life is relatively short. It is clear that
As described above, the cutting tip according to the present invention exhibits excellent wear resistance over a long period of time not only in cutting under normal conditions but also in high-speed cutting. It can cope with energy saving and cost reduction sufficiently satisfactorily.
Claims (1)
Ｃｏ：４〜１２％、
Ｃｒおよび／またはＶ：０．１〜２％、
を含有し、残りの硬質相が酸素および窒素を固溶含有する炭化タングステンからなる組成を有し、かつ前記硬質相の酸素および窒素含有量が、前記硬質相の中心部をオージェ電子分光分析装置を用いて測定した値で、
酸素：０．２〜０．６％、
窒素：０．１〜０．２５％、
である超硬合金で構成したこと、
を特徴とする高速切削加工ですぐれた耐摩耗性を発揮する超硬合金製スローアウエイ式切削チップ。Any of them is a binder phase forming component, and all of them are in mass% below.
Co: 4-12%,
Cr and / or V: 0.1 to 2%,
And the remaining hard phase has a composition made of tungsten carbide containing solid solution of oxygen and nitrogen, and the oxygen and nitrogen content of the hard phase is the Auger electron spectroscopic analyzer for the central portion of the hard phase. Is a value measured using
Oxygen: 0.2-0.6%,
Nitrogen: 0.1-0.25%,
Made of cemented carbide, which is
This is a cemented carbide throwaway cutting tip that exhibits excellent wear resistance in high-speed cutting.
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