JP7084682B2 - Cvd被覆切削工具 - Google Patents
Cvd被覆切削工具 Download PDFInfo
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Description
[式中、I(hkl)は、(hkl)反射の測定強度(積分面積)であり、I0(hkl)は、ICDDのPDFカード番号00-010-0173による標準強度であり、nは計算に用いられる反射数であり、用いられる(hkl)反射は、(1 0 4)、(1 1 0)、(1 1 3)、(0 2 4)、(1 1 6)、(2 1 4)、(3 0 0)及び(0 0 12)である]を示し、
TC(0 0 12)≧7.2、好ましくは≧7.4、より好ましくは≧7.5、より好ましくは≧7.6、最も好ましくは≧7.7、及び好ましくは≦8であり、I(0 0 12)/I(0 1 14)≧1、好ましくは≧1.5、より好ましくは≧1.7、最も好ましくは≧2の比であり、I(0 0 12)は、0 0 12反射の測定強度(積分面積)であり、I(0 1 14)は、0 1 14反射の測定強度(積分面積)であることを特徴とする。I(0 1 14)と等しいか又はより大きいI(0 0 12)と組み合わせたこのように高いTC(0 0 12)を有するα-Al2O3層は、その予想外に高いクレータ及びフランク摩耗抵抗のため、切削工具上の層として有利であることが示されてきた。
式中、I(hkl)は、(hkl)反射の測定強度(積分面積)であり、I0(hkl)は、ICDDのPDFカード番号42-1489による標準強度であり、nは、反射数であり、計算に用いられる反射は、(1 1 1)、(2 0 0)、(2 2 0)、(3 1 1)、(3 3 1)、(4 2 0)、(4 2 2)及び(5 1 1)であり、TC(2 2 0)は、≦0.5、好ましくは≦0.3、より好ましくは≦0.2、最も好ましくは≦0.1である。(2 2 0)からの低強度は、それに続くα-Al2O3層の強い<0 0 1>集合組織を促進するように見える点で有利であることを示した。低いTC(220)を達成する一つの方法のは、MTCVD TiCN堆積の初期の部分、好ましくは開始時に、TiCl4/CH3CNの体積比を相対的に高いレベルに調整することである。
下記の例におけるCVDコーティングは、10000のハーフインチサイズの切削インサートを収容可能なラジカルイオン結合型CVD装置530サイズ内で堆積された。
層の集合組織を調査するために、X線回析が、PIXcel detectorを備えるPANalytical CubiX3回折計を用いて、フランク面上で実施された。被覆切削工具は、サンプルホルダーに載せられ、サンプルのフランク面がサンプルホルダーの参照表面に平行であり、フランク面が適度な高さであることを補償した。45kVの電圧及び40mAの電流で、Cu-Kα放射線が測定のために用いられた。1/2度の散乱防止スリット及び1/4度の発散スリットが用いられた。被覆切削工具からの回折強度は、2θが20°から140°の範囲、すなわち10°から70°までの入射角θ範囲にわたって測定された。
旋削用のISO型CNMG120408の超硬合金基材(試料E13C-1、E13C-2、E29C-1、E29C-2、E30C-1、E30C-2、E35C-1及びE35C-2)は、7.2wt%のCo、2.7wt%のTa、1.8wt%のTi、0.4wt%のNb、0.1wt%のN及び残部WCから製造され、基材表面から実質的に立方晶炭化物を含まない本体中へ入り込んだ深さまで約25μmのCo富化表面領域を含む。超硬合金の組成は、そのため、約7.2wt%のCo、2.9wt%のTaC、1.9wt%のTiC、0.4wt%のTiN、0.4wt%のNbC及び86.9wt%のWCである。ISO型SNMA120408の超硬合金基材(試料E13S、E29S、E30S及びE35S)は、対応する組成及び表面領域で製造された。
表1(TiN及びTiCNのMTCVD)
表2(ボンディング層堆積)
表3(第二のα-Al2O3堆積工程)
旋削用のISO型CNMG120408の超硬合金基材は、7.2wt%のCo、2.7wt%のTa、1.8wt%のTi、0.4wt%のNb、0.1wt%のN及び残部WCから製造され、基材表面から実質的に立方晶炭化物を含まない本体中へ入り込んだ深さまで約25μmのCo富化表面領域を含む。
XRDが用いられ、上記に開示される方法に従って、α-Al2O3及びTiCNのTC値を分析した。被覆されたCNMG120408基材の二つの個々の試料は、集合組織分析がされ、それに続いて摩耗試験がされた、一方、被覆されたSNMA120408基材は、集合組織分析されただけであった。層厚は、1000×倍率で各コーティングの断面を調査することにより光学顕微鏡において分析され、ボンディング層及び初期のTiN層の両方が、表2において与えられるTiCN層厚に含まれる。結果は表4に表される。
表4(厚さ及び回析データ)
切削摩耗試験の前に、インサートは、ウエットブラスティング装置内で、水中のアルミナのスラリーを用いて、すくい面上がブラスト処理され、切削インサートのすくい面とブラスタースラリーの方向の間の角度は約90°であった。アルミナ粒子はF220、ガンに対するスラリーの圧力は1.8 bar、ガンに対する空気の圧力は2.2 bar、面積単位当たりの平均時間は4.4秒、ガンノズルからインサートの表面までの距離は約145mmであった。ブラスティングの目的は、コーティング中の残留応力及び表面粗さに影響を与え、それにより、その後に続く切削試験におけるインサートの特性を改良することである。
切削測度VC:220 m/分
切削送り、f:0.3 mm/回転
切り込み、aP:2 mm
表5(摩耗性能)
Claims (22)
- α-Al2O3の層を含むコーティングで被覆された基材を備える被覆切削工具であって、前記α-Al2O3層が、CuKα放射線及びθ-2θスキャンを用いるX線回析により測定され、ハリスの式により定義される集合組織係数TC(hkl)
[式中、I(hkl)は、(hkl)反射の測定強度(積分面積)であり、I0(hkl)は、ICDDのPDFカード番号00-010-0173による標準強度であり、nは、計算に用いられる反射数であり、用いられる(hkl)反射は、(1 0 4)、(1 1 0)、(1 1 3)、(0 2 4)、(1 1 6)、(2 1 4)、(3 0 0)及び(0 0 12)である]
を示し、
TC(0 0 12)≧7.5であり、
I(0 0 12)/I(0 1 14)≧1の比であり、
コーティングが、基材とα-Al2O3層の間に位置するMTCVD TiCN層を更に含み、
α-Al 2 O 3 層と基材の間に位置するMTCVD TiCN層が、CuKα放射線及びθ-2θスキャンを用いるX線回析により測定され、ハリスの式により定義される集合組織係数TC(hkl)[式中、I(hkl)は、(hkl)反射の測定強度(積分面積)であり、I 0 (hkl)は、ICDDのPDFカード番号42-1489による標準強度であり、nは反射数であり、計算に用いられる反射は、(1 1 1)、(2 0 0)、(2 2 0)、(3 1 1)、(3 3 1)、(4 2 0)、(4 2 2)及び(5 1 1)である]
を示し、
TC(2 2 0)≦0.5であることを特徴とする、被覆切削工具。 - TC(0 0 12)が≧7.6である、請求項1に記載の被覆切削工具。
- TC(0 0 12)が≧7.7である、請求項2に記載の被覆切削工具。
- I(0 0 12)/I(0 1 14)が≧1.5の比である、請求項1から3のいずれか一項に記載の被覆切削工具。
- I(0 0 12)/I(0 1 14)が≧1.7の比である、請求項4に記載の被覆切削工具。
- I(0 0 12)/I(0 1 14)≧2の比である、請求項5に記載の被覆切削工具。
- TC(2 2 0)≦0.3である、請求項1から6のいずれか一項に記載の被覆切削工具。
- TC(2 2 0)≦0.2である、請求項7に記載の被覆切削工具。
- TC(2 2 0)≦0.1である、請求項8に記載の被覆切削工具。
- α-Al2O3層の厚さが2-20μmである、請求項1から9のいずれか一項に記載の被覆切削工具。
- 前記MTCVD TiCN層の厚さが、4-20μmである、請求項1に記載の被覆切削工具。
- コーティングが、MTCVD TiCN層の最も外側に位置し、α-Al2O3層に隣接するHTCVD TiCN及びTiCNOを含むボンディング層を更に含む、請求項1から11のいずれか一項に記載の被覆切削工具。
- ボンディング層の厚さが0.5-2μmである、請求項12に記載の被覆切削工具。
- MTCVD TiCN層がTC(4 2 2)≧3を示す、請求項1から13のいずれか一項に記載の被覆切削工具。
- MTCVD TiCN層がTC(4 2 2)≧3.5を示す、請求項14に記載の被覆切削工具。
- MTCVD TiCN層のTC(3 1 1)+TC(4 2 2)が、≧4である、請求項1から15のいずれか一項に記載の被覆切削工具。
- MTCVD TiCN層のTC(3 1 1)+TC(4 2 2)が、≧5である、請求項16に記載の被覆切削工具。
- MTCVD TiCN層のTC(3 1 1)+TC(4 2 2)が、≧6である、請求項17に記載の被覆切削工具。
- MTCVD TiCN層のTC(3 1 1)+TC(4 2 2)が、≧7である、請求項18に記載の被覆切削工具。
- 基材が超硬合金、サーメット又はセラミックである、請求項1から19のいずれか一項に記載の被覆切削工具。
- 鋼の旋削加工作業における、請求項1から20のいずれか一項に記載の被覆切削工具の使用。
- 合金鋼、炭素鋼、又は靱性のある硬化鋼の旋削加工作業における、請求項21に記載の使用。
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US20160175940A1 (en) | 2016-06-23 |
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