JP2020524085A - コーティングされた切削工具 - Google Patents
コーティングされた切削工具 Download PDFInfo
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- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
- B23B27/148—Composition of the cutting inserts
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Abstract
Description
本発明は、κ−アルミナの副層及びTiN、TiC、TiCN、TiCO又はTiCNOの副層を有する多層を含む、コーティングされた金属切削工具に関する。
式中、I(hkl)は(hkl)反射の測定強度(ピーク面積)であり、I0(hkl)はPDFカードに従った標準強度である。
XRD試験
多結晶膜のテクスチャを分析する一般的な方法は、ハリスの式と標準強度PDFカードに基づいてテクスチャ係数(TC)を計算することである。しかしながら、κ−Al2O3の結晶構造は対称性が低く、したがってディフラクトグラムに低強度の多数のピークがあるため、κ−Al2O3多層の面外テクスチャをテクスチャ係数の計算から決定することは困難である。また、多くの重なり合うピークがある。したがって、κ−Al2O3多層の最高強度のピークが、ここでは層のテクスチャの測定値として選択される。
式中、I(hkl)は(hkl)反射の測定強度(ピーク面積)であり、I0(hkl)はICDDのPDFカード番号00−010−0173に従った標準強度であり、nは計算に使用される反射の数であり、使用される(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)であり、TC(0 0 12)≧2、好ましくは>4、より好ましくは>5である。
表1.層の厚さ
約0.4μmのTiNの最初の最も内側のコーティングが、400mbar及び885℃でのプロセスにおいてすべての基材上に堆積された。48.8体積%のH2、48.8体積%のN2、及び2.4体積%のTiCl4のガス混合物を使用した。
κ−Al2O3多層のテクスチャを調査するために、X線回折を、PIXcel検出器を備えたパナリティカル(PANalytical)のCubiX3回折計を使用して、逃げ面上で行った。コーティングされた切削工具をサンプルホルダー内に取り付けて、サンプルの逃げ面がサンプルホルダーの基準面に対して平行であること、及び逃げ面が適切な高さにあることを確実にした。Cu−Kα線を、45kVの電圧及び40mAの電流で測定に使用した。1/2度の散乱線除去スリット及び1/4度の発散スリットを使用した。コーティングされた切削工具からの回折強度を、15°から140°までの2θの範囲内で、すなわち7.5°から70°までの入射角θの範囲にわたって測定した。
表2.κ−Al2O3のXRDディフラクトグラムからのピーク強度(ピーク面積)。最強のκ−Al2O3ピークが強度100.0に設定されるように正規化されている。
が計算に使用され、式中、I(hkl)は(hkl)反射の測定強度(ピーク面積)であり、I0(hkl)は標準強度であり、nは計算に使用される反射の数であり、(hkl)は使用される反射である。TiCN層及びα−Al2O3層のテクスチャ解析において、薄膜補正及び被覆層における吸収の補正について補正された。多層における吸収に起因する補正は、TiNの6つの副層とκ−Al2O3の6つの副層の厚さをまとめることによって一般化され、あたかも1つのTiN層と1つのκ−Al2O3層だけが調査の層を覆っているかのように計算された。
表3.TiCNのテクスチャ係数。
表4.α−Al2O3のテクスチャ係数。
ISO型CNMG120408のコーティングされた切削インサートの耐クレータ摩耗性を、以下の切削データを使用して、軸受鋼(Ovako 825B)における長手方向旋削において評価した。
切削速度、vc:220m/分
切削送り、f:0.3mm/回転
切削深さ、ap:2mm
表5.摩耗の結果
Claims (14)
- 基材とコーティングとを含むコーティングされた切削工具であって、
コーティングが、κ−Al2O3の副層とTiN、TiC、TiCN、TiCO又はTiCNOの副層とが交互になったものからなる多層を含み、前記多層が少なくとも3つのκ−Al2O3の副層を含み、
前記多層が、15°−140°のθ−2θスキャンにわたってXRD回折を示し、
0 0 2回折ピーク(ピーク面積)が、多層のうちのκ−Al2O3副層に由来する最も強いピークであることを特徴とする、コーティングされた切削工具。 - 各TiN、TiC、TiCN、TiCO又はTiCNO副層の平均厚さが、10−500nmである、請求項1に記載のコーティングされた切削工具。
- 各κ−Al2O3副層の平均厚さが、30−900nm、好ましくは50−800nmである、請求項1又は2に記載のコーティングされた切削工具。
- 基材と多層との間に配置されるα−Al2O3層をさらに含む、請求項1から3のいずれか一項に記載のコーティングされた切削工具。
- 前記α−Al2O3層の厚さが、0.1−10μm、好ましくは0.1−5μm、より好ましくは0.1−3μmである、請求項4に記載のコーティングされた切削工具。
- 基材と多層との間に配置されるTiCN層をさらに含む、請求項1から5のいずれか一項に記載のコーティングされた切削工具。
- 前記TiCN層の厚さが2−15μmである、請求項6に記載のコーティングされた切削工具。
- TiCN層が、CuKα線及びθ−2θスキャンを使用するX線回折により測定される場合、ハリスの式に従って定義されるテクスチャ係数TC(hkl)を示し、式中、I(hkl)は(hkl)反射の測定強度(ピーク面積)であり、I0(hkl)はICDDのPDFカード番号42−1489に従った標準強度であり、nは反射の数であり、計算に使用される反射は、(1 1 1)、(2 0 0)、(2 2 0)、(3 1 1)、(3 3 1)、(4 2 0)及び(4 2 2)であり、TC(422)+ TC(311)>3、好ましくは>4である、請求項6又は7に記載のコーティングされた切削工具。
- 前記κ−Al2O3多層の厚さが1−15μmである、請求項1から8のいずれか一項に記載のコーティングされた切削工具。
- 総コーティング厚さが2−9μmであり、かつ前記κ−Al2O3多層が、5−70層のκ−Al2O3の副層を含む、請求項1から9のいずれか一項に記載のコーティングされた切削工具。
- 総コーティング厚さが7−25μmであり、かつκ−Al2O3多層が、5−150層のκ−Al2O3の副層を含む、請求項1から10のいずれか一項に記載のコーティングされた切削工具。
- 多層が、κ−Al2O3の副層とTiNの副層とが交互になったものからなる、請求項1から11のいずれか一項に記載のコーティングされた切削工具。
- 基材が、超硬合金のもの又はサーメットのものである、請求項1から12のいずれか一項に記載のコーティングされた切削工具。
- 基材が、4−12重量%のCo、0.1−10重量%の、周期表のIVb、Vb及びVIb族の金属、好ましくは、Ti、Nb、Ta又はそれらの組み合わせの、立方晶炭化物、窒化物又は炭窒化物と、残部WCとを含む組成物を有する超硬合金のものである、請求項1から13のいずれか一項に記載のコーティングされた切削工具。
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