JPWO2016121690A1 - 被覆工具 - Google Patents
被覆工具 Download PDFInfo
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- JPWO2016121690A1 JPWO2016121690A1 JP2016572020A JP2016572020A JPWO2016121690A1 JP WO2016121690 A1 JPWO2016121690 A1 JP WO2016121690A1 JP 2016572020 A JP2016572020 A JP 2016572020A JP 2016572020 A JP2016572020 A JP 2016572020A JP WO2016121690 A1 JPWO2016121690 A1 JP WO2016121690A1
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Abstract
Description
また、X線回折分析にて分析される前記酸化アルミニウム層のピークを基に、下記式で表される値を配向係数Tc(hkl)としたとき、前記第2面における配向係数Tcf(104)とTcf(012)との比(Tcf(104)/Tcf(012))が、前記第1面における配向係数Tcr(104)とTcr(012)との比(Tcr(104)/Tcr(012))よりも高い。
配向係数Tc(hkl)={I(hkl)/I0(hkl)}/〔(1/7)×Σ{I(HKL)/I0(HKL)}〕
ここで、(HKL)は、(012)、(104)、(110)、(006)、(113)、(024)、(116)の結晶面を示す。I(HKL)およびI(hkl)は、前記酸化アルミニウム層のX線回折分析において検出される各結晶面に帰属されるピークのピーク強度を示す。I0(HKL)およびI0(hkl)は、JCPDSカードNo.43−1484に記載された各結晶面の標準回折強度を示す。
本開示の一実施態様を示す切削工具(以下、単に工具と略す)1は、第1面2と、第1面2に隣り合う第2面3と、第1面2と第2面3との間の稜線部に位置する切刃4と、を備える。本実施形態においては、図1に示すように、工具1は、その形状が多面体であり、第1面2がすくい面2、第2面3が逃げ面である。以下、第1面2をすくい面2、第2面3を逃げ面3という。なお、図1に示す工具1のすくい面2の中央にはネジ孔15が存在するが、ネジ孔15は必ずしも必要ではない。
被覆層6は、下層7、炭窒化チタン層8、中間層9、酸化アルミニウム層10および表層11を備えている。下層7、炭窒化チタン層8、中間層9、酸化アルミニウム層10および表層11は、基体5側から順に積層されている。なお、酸化アルミニウム層10はα型結晶構造からなる。
配向係数Tc(hkl)={I(hkl)/I0(hkl)}/〔(1/7)×Σ{I(HKL)/I0(HKL)}〕
ここで、(HKL)は、(012)、(104)、(110)、(006)、(113)、(024)、(116)の結晶面を示し
I(HKL)およびI(hkl)は、酸化アルミニウム層10のX線回折分析において検出される各結晶面に帰属されるピークのピーク強度を示す。I0(HKL)およびI0(hkl)は、JCPDS(Joint Committee on Powder Diffraction Standards)カードNo.43−1484に記載された各結晶面の標準回折強度を示す。
条件1:X線回折チャートにおいて、逃げ面3におけるピークのうち、(006)面に帰属されるピークのピーク強度If(006)または(104)面に帰属されるピークのピーク強度If(104)が最も高い。
条件2:X線回折チャートにおいて、すくい面2におけるピークのうち、(006)面に帰属されるピークのピーク強度Ir(006)または(012)面に帰属されるピークのピーク強度Ir(012)が最も高い。
以上の条件1、2の双方を満足することによって、逃げ面3における耐摩耗性をより改善することができる。
まず、無機物粉末に、金属粉末、カーボン粉末、バインダー等を適宜添加、混合した混合物を生成する。無機物粉末の例としては、硬質合金を焼成によって形成しうる金属炭化物、窒化物、炭窒化物、酸化物等が挙げられる。金属粉末の例としては、コバルト粉末等が挙げられる。次に、前記混合物を公知の成形方法によって所定の成形体を生成する。本実施形態においては、工具1はネジ孔15を有することから、ネジ孔15に対応する孔が存在するような成形体とする。成形方法としては、プレス成形、鋳込成形、押出成形、冷間静水圧プレス成形等が挙げられる。そして、前記成形体を所望によって脱バインダ処理した後、真空中または非酸化性雰囲気中にて焼成することによって基体5を作製する。そして、上記基体5の表面に所望によって研磨加工や切刃部のホーニング加工を施す。
本実施態様においては、被覆層6を化学気相蒸着(CVD)法によって成膜する。図4に、被覆層6を成膜する成膜装置内における基体5のセット方法の一例を示す。図4Aは、セット治具20を複数段積み重ねた模式図であり、図4Bは、基体5の配置を説明するための断面図である。基体5のセットにあたり、図4のセット方法によれば、まず、所定の間隔で支持棒を配置したセット治具20を準備する。支持棒21に基体5の中央のネジ孔15を通して、基体5を支持棒21で保持する。そして、セット治具20を複数段積み重ねる。セット治具20内に複数の基体5をセットする場合、基体5同士、および基体5とセット治具20との間隔を調整する。具体的には、すくい面2となる基体5aとセット治具20との間の間隔d1が、逃げ面3となる基体5b同士間の間隔d2よりも狭くなるように調整してセットする。より具体的には、すくい面2間の間隔はすくい面2の内接円(すくい面2内に描ける最大の円)の直径Lに対して0.7以下に調整し、逃げ面3間の間隔は直径Lに対して0.7より大きくする。これによって、すくい面2および逃げ面3における酸化アルミニウム層10の結晶配向を制御することができる。
この研磨加工により、切刃4が平滑に加工され、被削材の溶着を抑制して、さらに耐欠損性に優れた工具となる。研磨方法としては、ブラシ加工、ブラスト加工および弾性砥石を用いた研磨加工が挙げられる。
(連続切削条件)
被削材 :クロムモリブデン鋼材(SCM435)
工具形状:CNMG120408
切削速度:300m/分
送り速度:0.3mm/rev
切り込み:1.5mm
切削時間:25分
その他 :水溶性切削液使用
評価項目:走査型電子顕微鏡にて刃先ホーニング部分を観察し、実際に摩耗している部分において、逃げ面摩耗幅を測定。
(断続切削条件)
被削材 :クロムモリブデン鋼 4本溝入り鋼材(SCM440)
工具形状:CNMG120408
切削速度:300m/分
送り速度:0.3mm/rev
切り込み:1.5mm
その他 :水溶性切削液使用
評価項目:欠損に至る衝撃回数を測定。
2・・・すくい面
3・・・逃げ面
4・・・切刃
5・・・基体
6・・・被覆層
7・・・下層
8・・・炭窒化チタン層
8a・・・MT−炭窒化チタン層
8b・・・HT−炭窒化チタン層
9・・・中間層
9a・・・下部中間層
9b・・・上部中間層
10・・酸化アルミニウム層
11・・・表層
15・・・ネジ孔
Claims (7)
- 第1面と、該第1面に隣り合う第2面と、前記第1面と第2面との稜線部の少なくとも一部に位置する切刃とを有する被覆工具において、
基体と、該基体上に位置する被覆層と、を備え、
前記被覆層は、炭窒化チタン層と、α型結晶構造の酸化アルミニウム層と、を備え、
前記炭窒化チタン層は、前記酸化アルミニウム層よりも前記基体に対して近くに位置し、X線回折分析にて分析される前記酸化アルミニウム層のピークを基に、下記式で表される値を配向係数Tc(hkl)としたとき、
前記第2面における前記被覆層の配向係数Tcf(104)とTcf(012)との比(Tcf(104)/Tcf(012))が、前記第1面における前記被覆層における配向係数Tcr(104)とTcr(012)との比(Tcr(104)/Tcr(012))よりも高い被覆工具。
配向係数Tc(hkl)={I(hkl)/I0(hkl)}/〔(1/7)×Σ{I(HKL)/I0(HKL)}〕
ここで、(HKL)は、(012)、(104)、(110)、(006)、(113)、(024)、(116)の結晶面を示し、
I(HKL)およびI(hkl)は、前記酸化アルミニウム層のX線回折分析において検出される各結晶面に帰属されるピークのピーク強度を示し
I0(HKL)およびI0(hkl)は、JCPDSカードNo.43−1484に記載された各結晶面の標準回折強度を示す。 - 前記Tcf(104)が前記Tcf(012)よりも高く、かつ前記Tcr(104)が前記Tcr(012)よりも低い請求項1に記載の被覆工具。
- 前記第2面における前記被覆層での前記酸化アルミニウム層のピークのうち、(006)面に帰属されるピークのピーク強度If(006)または(104)面に帰属されるピークのピーク強度If(104)が最も高く、かつ前記第1面における前記被覆層での前記酸化アルミニウム層のピークのうち、(006)面に帰属されるピークのピーク強度Ir(006)または(012)面に帰属されるピークのピーク強度Ir(012)が最も高い請求項1または2に記載の被覆工具。
- 前記切刃は曲面状であり、前記第1面を正面視したときにおける前記曲面の幅L1と前記第2面を正面視したときにおける前記曲面の幅L2との比(L1/L2)が1.3〜2.0である請求項1乃至3のいずれか記載の被覆工具。
- 前記第2面を正面視したときにおける前記曲面の幅L2が0.030〜0.080mmである請求項4記載の被覆工具。
- 前記第1面に対応する前記基体の表面の界面粗さが、前記第2面に対応する前記基体の表面の界面粗さよりも小さい請求項1乃至5のいずれか記載の被覆工具。
- 前記第1面がすくい面であり、前記第2面が逃げ面である請求項1乃至6のいずれか記載の被覆工具。
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