JP2748583B2 - Surface-coated tungsten carbide based cemented carbide cutting tool with excellent adhesion of hard coating layer - Google Patents
Surface-coated tungsten carbide based cemented carbide cutting tool with excellent adhesion of hard coating layerInfo
- Publication number
- JP2748583B2 JP2748583B2 JP1220047A JP22004789A JP2748583B2 JP 2748583 B2 JP2748583 B2 JP 2748583B2 JP 1220047 A JP1220047 A JP 1220047A JP 22004789 A JP22004789 A JP 22004789A JP 2748583 B2 JP2748583 B2 JP 2748583B2
- Authority
- JP
- Japan
- Prior art keywords
- coating layer
- hard coating
- based cemented
- cemented carbide
- tungsten carbide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、硬質被覆層の炭化タングステン（以下WC
で示す）基超硬合金基体に対する密着性にすぐれ、特に
フライス切削や仕上げ旋削使用した場合にすぐれた切削
性能を長期に亘って発揮する表面被覆WC基超硬合金製切
削工具に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a tungsten carbide (hereinafter referred to as WC) having a hard coating layer.
The present invention relates to a surface-coated WC-based cemented carbide cutting tool having excellent adhesion to a base cemented carbide substrate and exhibiting excellent cutting performance over a long period of time, especially when using milling or finish turning.
従来、例えば鋼や鋳鉄の荒旋削などの靱性が要求され
る切削に、特開昭52−110209号公報や特開昭54−87719
号公報、さらに米国特許第4610931号明細書に記載され
る、表面部に内部の硬さに比べて２〜20％低い硬さの表
面軟化層を形成したWC基超硬合金基体の表面に、元素周
期律表の4a,5a,および6a族金属の炭化物、窒化物、およ
び酸化物、並びにこれらの２種以上の固溶体、さらに酸
化アルミニウム（以下Al2O3で示す）のうちの１種の単
層または２種以上の複層からなる硬質被覆層を形成して
なる表面被覆WC基超硬合金製切削工具が用いられてい
る。Conventionally, for cutting toughness such as rough turning of steel or cast iron, for example, JP-A-52-110209 and JP-A-54-87719.
No. 4,069,931, described in the specification, the surface portion of the surface of the WC-based cemented carbide substrate having a surface softening layer having a hardness lower than the internal hardness by 2 to 20%, Carbides, nitrides, and oxides of metals of Groups 4a, 5a, and 6a of the Periodic Table of the Elements, two or more solid solutions thereof, and one of aluminum oxide (hereinafter, referred to as Al 2 O 3 ) A surface-coated WC-based cemented carbide cutting tool having a hard coating layer composed of a single layer or two or more types of multiple layers is used.
しかし、上記の表面軟化層を有するWC基超硬合金基体
の表面に、硬質被覆層を形成してなる従来表面被覆WC基
超硬合金製切削工具は、これを大きな機械的衝撃が加わ
る荒旋削に用いた場合には、基体の表面軟化層による靱
性向上効果によって、硬質被覆層に剥離の発生なく、す
ぐれた切削性能を長期に亘って発揮するが、これを硬質
被覆層に熱的衝撃や機械的微小振動が加わるフライス切
削や、さらに硬質被覆層に強いせん断力が加わる仕上げ
旋削に用いた場合には、硬質被覆層のWC基超硬合金基体
に対する密着強度が十分ないために、硬質被覆層に欠損
やチッピングが発生し、短時間の使用寿命しか示さない
のが現状である。However, the conventional surface-coated WC-based cemented carbide cutting tool, in which a hard coating layer is formed on the surface of the WC-based cemented carbide substrate having a surface softened layer described above, is not suitable for rough turning where a large mechanical impact is applied. In the case where the hard coating layer is used for a long time, excellent cutting performance is exhibited over a long period of time without peeling of the hard coating layer due to the effect of improving the toughness of the surface softening layer of the substrate. When used for milling with mechanical micro-vibration or finish turning where strong shearing force is applied to the hard coating layer, the hard coating layer has insufficient adhesion strength to the WC-based cemented carbide substrate. At present, the layer is deficient or chipped and shows only a short service life.
そこで、本発明者等は、上述のような観点から、上記
の従来表面被覆WC基超硬合金製切削工具に着目し、これ
のWC基超硬合金基体に対する硬質被覆層の密着性向上を
はるべく研究を行った結果、 （ａ）一般に、WC基超硬合金基体は、通常の粉末冶金法
にて、原料粉末を所定の配合組成に配合し、いずれも通
常の条件で、混合した後、圧粉体にプレス成形し、この
圧粉体を、真空中、1380〜1480℃の温度で焼結し、つい
で焼結体に、必要に応じて汚れ落しの目的でSiC粉末やA
l2O3粉末などを用いてショットピーニングを施した状態
で、例えばダイヤモンド砥石を用いて、寸法出しのため
の研削を行なうことにより製造されており、この結果得
られたWC基超硬合金基体は、表面部および内部とも均一
な組織をもつが、これに、上記の焼結雰囲気と同等もし
くは相対的に高真空の真空中、あるいはArやN2などの不
活性ガス雰囲気中で、1400〜1450℃の温度に所定時間保
持の熱処理を施すと、前記熱処理条件によって、基体表
面部には、結合相形成成分としてのCo含有量が内部のCo
含有量よりも低く、かつ硬質相形成成分としてのWCの粒
径が内部のWC粒径よりも粗い層が形成されるようにな
り、また、表面に対するＸ線回折で、上記熱処理前のWC
基超硬合金基体では、WCの（211）面に単一ピークの波
形しか現われないが、上記熱処理後では、前記波形が２
つに分離した高低差のある連続ピーク波形となること。Therefore, the present inventors have focused on the above-mentioned conventional surface-coated WC-based cemented carbide cutting tool from the above-described viewpoint, and have attempted to improve the adhesion of the hard coating layer to the WC-based cemented carbide substrate. As a result of researching as much as possible, (a) In general, a WC-based cemented carbide substrate is prepared by mixing raw material powders into a predetermined compounding composition by a normal powder metallurgy method and mixing them under normal conditions. , And press-molded into a green compact.The green compact is sintered at a temperature of 1380 to 1480 ° C in a vacuum.
It is manufactured by grinding for dimensioning using, for example, a diamond whetstone in a state where shot peening is performed using l 2 O 3 powder etc., and the resulting WC-based cemented carbide substrate is has a surface portion and the interior with uniform structure, in which, in a vacuum of the sintering atmosphere is equal to or relatively high vacuum or in an inert gas atmosphere such as Ar or N 2, 1400 to When a heat treatment of holding at a temperature of 1450 ° C. for a predetermined time is performed, the content of Co as a binder phase forming component is changed to a Co content inside the substrate surface portion by the heat treatment conditions.
A layer having a lower WC particle size than the content and having a particle size of WC as a hard phase forming component which is coarser than the internal WC particle size is formed.
In the base cemented carbide substrate, only a single peak waveform appears on the (211) plane of the WC, but after the heat treatment, the waveform has two peaks.
A continuous peak waveform with a height difference that is separated into two.
（ｂ）上記熱処理後のWC基超硬合金基体、すなわち表面
部に、Co含有量が内部に比して相対的に低く、かつWC粒
径が相対的に内部に比して粗い層が形成されたWC基超硬
合金基体に、通常の化学蒸着法により、上記の通りの硬
質被覆層を形成すると、この硬質被覆層は基体表面に対
する密着性が著しく向上するようになり、特に上記基体
表面に対して、第１層として炭化チタン、窒化チタン、
および炭窒化チタン（以下、TiC,TiN,およびTiCNで示
す）からなるTi化合物のうちのいずれかで構成された硬
質被覆層を形成すると、このTi化合物からなる硬質被覆
層の上記基体表面に対する密着性は一段と向上するこ
と。(B) Formed on the surface of the WC-based cemented carbide substrate after the above heat treatment, that is, a layer having a relatively low Co content and a relatively coarse WC particle size as compared to the inside, on the surface. When a hard coating layer as described above is formed on a WC-based cemented carbide substrate obtained by a conventional chemical vapor deposition method, the adhesion of the hard coating layer to the substrate surface is remarkably improved. In contrast, titanium carbide, titanium nitride,
When a hard coating layer composed of any one of Ti compounds composed of titanium carbide and titanium carbonitride (hereinafter referred to as TiC, TiN, and TiCN) is formed, the adhesion of the hard coating layer composed of the Ti compound to the surface of the substrate is improved. Sex should be further improved.
（ｃ）また、この結果製造された表面被覆WC基超硬合金
製切削工具の表面に対するＸ線回折でも、上記（ａ）項
で示されている熱処理後のWC基超硬合金基体が示したと
同じ波形、すなわちWCの（211）面に２つに分離した高
低差のある連続ピーク波形が現われること。(C) Also, the X-ray diffraction of the surface of the resulting coated WC-based cemented carbide cutting tool showed that the WC-based cemented carbide substrate after the heat treatment described in the above item (a) showed. The same waveform, that is, a continuous peak waveform with a height difference separated into two appears on the (211) plane of the WC.
以上（ａ）〜（ｃ）に示される知見を得たのである。The findings shown in (a) to (c) above were obtained.
この発明は、上記知見にもとづいてなされたものであ
って、表面部における結合相形成成分としてのCo含有量
が内部におけるCo含有量よりも相対的に低い、すなわち
表面部のCo含有量を（Co）S、内部のCo含有量を（Co）I
とした場合、 （Co）S／（Co）I×100＜90％、 の関係式を満足すると共に、 表面部における硬質相形成成分としてのWCが内部にお
けるWCに比して相対的に粗粒である、すなわち表面部の
WCの平均粒径をWCS、内部のWCの平均粒径をWCIとした場
合、 の関係式を満足するWC基超硬合金基体の表面に、通常の
化学蒸着法にて、 元素周期律表の4a,5a,および6a族金属の炭化物、窒化
物、および酸化物、並びにこれらの２種以上の固溶体、
さらにAl2O3のうちの１種の単層または２種以上の複層
からなる硬質被覆層を形成してなる表面被覆WC基超硬合
金製切削工具にして、上記構成のこの発明の表面被覆WC
基超硬合金製切削工具は上記硬質被覆層の上記WC基超硬
合金基体に対する密着性にすぐれているので、これを硬
質被覆層に高い付着強度が要求されるフライス切削や仕
上げ旋削に用いた場合にも、すぐれた耐摩耗性と耐欠損
性を長期に亘って示すものであり、さらに上記のWC基超
硬合金基体、およびこの発明の表面被覆WC基超硬合金製
切削工具は、その表面に対するＸ線回折で、WCの（21
1）面に、２つに分離した高低差のある連続ピーク波形
が現われる回折曲線を示し、云いかえれば、WC基超硬合
金基体の表面に対するＸ線回折で、WCの（211）面に、
２つに分離した高低差のある連続ピーク波形が現われる
回折曲線を示す場合、これの表面に施される硬質被覆層
は密着性の高いものとなり、また表面被覆WC基超硬合金
製切削工具の表面に対するＸ線回折で、前記のWC基超硬
合金基体の場合と同じ回折曲線を示せば、表面被覆WC基
超硬合金製切削工具における硬質被覆層の基体表面に対
する付着強度が著しく高いことを示すものであり、これ
らの事実はいずれも経験的に判明したものであり、さら
にまた、上記WC基超硬合金基体の表面に、第１層がTiC,
TiN、またはTiCNのTi化合物からなる硬質被覆層を形成
した場合、これら硬質被覆層の基体表面に対する密着性
は一段と強固なものとなる点に特徴を有するものであ
る。The present invention has been made based on the above findings, and the Co content as a binder phase forming component in the surface portion is relatively lower than the Co content in the inside, that is, the Co content in the surface portion is reduced to ( Co) S , internal Co content (Co) I
In this case, (Co) S / (Co) I × 100 <90%, and the WC as the hard phase forming component on the surface is relatively coarser than the WC inside. That is,
If the average particle size of WC WC S, an average particle diameter of the interior of the WC was WC I, On the surface of a WC-based cemented carbide substrate satisfying the relational expression, carbides, nitrides and oxides of metals of Groups 4a, 5a and 6a of the Periodic Table of the Elements, and Two or more solid solutions,
Further, a cutting tool made of a surface-coated WC-based cemented carbide formed by forming a hard coating layer consisting of one kind of single layer or two or more kinds of Al 2 O 3 , Coated WC
Since the base cemented carbide cutting tool has excellent adhesion of the hard coating layer to the WC-based cemented carbide substrate, it was used for milling and finishing turning where high adhesion strength is required for the hard coating layer. In this case, it shows excellent wear resistance and fracture resistance over a long period of time, and the WC-based cemented carbide substrate described above, and the surface-coated WC-based cemented carbide cutting tool of the present invention, By X-ray diffraction on the surface, WC (21
1) The surface shows a diffraction curve in which a continuous peak waveform having a height difference separated into two appears. In other words, by X-ray diffraction on the surface of the WC-based cemented carbide substrate, the (211) plane of the WC shows
When the diffraction curve shows a continuous peak waveform with two different heights, the hard coating layer applied to the surface has high adhesion, and the surface coating of a WC-based cemented carbide cutting tool X-ray diffraction of the surface shows the same diffraction curve as that of the WC-based cemented carbide substrate, indicating that the adhesion strength of the hard coating layer to the substrate surface in the surface-coated WC-based cemented carbide cutting tool is extremely high. These facts have been empirically found, and the first layer is made of TiC, on the surface of the WC-based cemented carbide substrate.
When a hard coating layer made of TiN or TiCN is formed, the adhesion of the hard coating layer to the substrate surface is further enhanced.
なお、この発明の表面被覆WC基超硬合金製切削工具に
おいては、上記の通り表面部におけるCo含有量は内部の
それに比して90％以下であり、また表面部におけるWCの
平均粒径は内部のそれに比して10％以上粗粒である限定
がなされているが、これらのCo低減化割合およびWC粗粒
化割合はいずれも経験的に定められたものであって、こ
れらの範囲を外れると硬質被覆層に強固な付着強度を確
保するのが困難になるものである。In the cutting tool made of a surface-coated WC-based cemented carbide according to the present invention, as described above, the Co content in the surface portion is 90% or less of that in the inside, and the average particle size of WC on the surface portion is Although there is a limitation that the coarse particles are 10% or more in comparison with the inside, the Co reduction ratio and WC coarse particle ratio are both empirically determined, and these ranges If it is deviated, it becomes difficult to secure a strong adhesion strength to the hard coating layer.
つぎに、この発明の表面被覆WC基超硬合金製切削工具
を実施例により具体的に説明する。Next, the cutting tool made of a surface-coated WC-based cemented carbide according to the present invention will be specifically described with reference to examples.
原料粉末として、いずれも１〜６μｍの範囲内の平均
粒径を有するWC粉末、［WC/TiC/TaC＝50/30/20］の（W,
Ti,Ta）Ｃ粉末、［WC/TiC/TiN＝55/25/20、以上重量
比］の（W,Ti）CN粉末、TaC粉末、およびCo粉末を用意
し、これら原料粉末をそれぞれ第１表に示される配合組
成に配合し、ボールミルにて72時間湿式粉砕混合し、乾
燥した後、1ton/cm2の圧力にて圧粉体にプレス成形し、
この圧粉体を同じく第１表に示される条件に焼結し、こ
の結果得られた焼結体に必要に応じてAl2O3粉末を用い
てショットピーニングを施し、さらにダイヤモンド砥石
を用いて研削を施すことにより、実質的に配合組成と同
一の成分組成を有し、かつISO規格のSNGN/120412に定め
た形状のスローアウェイチップからなるWC基超硬合金基
体ａ〜ｆをそれぞれ製造した。As a raw material powder, WC powder having an average particle diameter in a range of 1 to 6 μm, [W / TiC / TaC = 50/30/20] (W,
Ti, Ta) C powder, (W / Ti) CN powder, [WC / TiC / TiN = 55/25/20, weight ratio above], a TaC powder, and a Co powder are prepared. blended with blending composition shown in Table, 72 hours wet milled and mixed in a ball mill, dried, and pressed into a green compact at a pressure of 1 ton / cm 2,
The green compact was sintered under the conditions shown in Table 1, and the resulting sintered body was subjected to shot peening using Al 2 O 3 powder as necessary, and further using a diamond whetstone. By performing grinding, WC-based cemented carbide substrates a to f each having a throw-away tip having substantially the same component composition as the compounding composition and having a shape defined by ISO standard SNGN / 120412 were manufactured. .
つぎに、これらのWC基超硬合金基体ａ〜ｆのそれぞれ
を用い、これに第２表に示される条件で熱処理を施し、
この状態で基体表面から深さ:2μｍ位置（表面部）と深
さ:100μｍ位置（内部）の結合相形成成分としてのCoの
含有量および硬質相形成成分としてのWCの平均粒径を測
定し、この測定結果にもとづいて、（Co）S／（Co）I×
100の値、並びに（WCS−WCI）／WCI×100の値（以下、
それぞれ相対比という）を算出し、さらに熱処理後の基
体表面に対して、 ターゲット・フィルター:Cu−Ni合金、 電圧:40kV、電流:40mA、 時定数:5秒、チャート速度:40mm/度、 の条件でＸ線回折を行ない、WCの（211）面に現われる
波形が、２つに分離した高低差のある連続ピーク波形
（以下分離波形という）か、あるいは単一ピーク波形
（以下単一波形という）かを観察し、ついで、上記の熱
処理後のWC基超硬合金基体の表面に、通常の化学蒸着法
を用い、硬質被覆層の構成成分が、それぞれ、 （ａ）TiCの場合 温 度:1030℃、圧 力:100torr、 反応ガス組成:4％TiCl4−５％CH4−91％H2、 （ｂ）TiNの場合 温 度:980℃、圧 力:100torr、 反応ガス組成:4％TiCl4−８％N2−88％H2、 （ｃ）TiCNの場合 温 度:1000℃、圧 力:100torr、 反応ガス組成:4％TiCl4−３％CH4−４％N2−89％H2、 （ｄ）TiCNOの場合 温 度:1000℃、圧 力:100torr、 反応ガス組成:4％TiCl4−３％CO−３％N2−90％H2、 （ｅ）Al2O3の場合 温 度:1000℃、圧 力:100torr、 反応ガス組成:3％AlCl3−５％CO2−92％H2、 の条件（上記の反応ガス組成については容量％を示す）
で、第３表に示される組成および平均層厚の硬質被覆層
を形成することにより本発明表面被覆WC基超硬合金製切
削工具（以下本発明被覆切削チップという）１〜６をそ
れぞれ製造した。Next, each of these WC-based cemented carbide substrates a to f was subjected to a heat treatment under the conditions shown in Table 2,
In this state, the content of Co as a binder phase forming component and the average particle size of WC as a hard phase forming component were measured at a depth of 2 μm (surface portion) and a depth of 100 μm (inside) from the substrate surface. , Based on the measurement result, (Co) S / (Co) I ×
The value of 100 and the value of (WC S -WC I ) / WC I × 100 (hereinafter,
Each of them is referred to as a relative ratio), and the target filter: Cu-Ni alloy, voltage: 40 kV, current: 40 mA, time constant: 5 seconds, chart speed: 40 mm / degree, X-ray diffraction is performed under the conditions, and the waveform that appears on the (211) plane of the WC is either a continuous peak waveform with a height difference separated into two (hereinafter referred to as a separated waveform) or a single peak waveform (hereinafter referred to as a single waveform) ), And then, on the surface of the WC-based cemented carbide substrate after the heat treatment described above, using a normal chemical vapor deposition method, the constituent components of the hard coating layer are: (a) In the case of TiC 1030 ° C, pressure: 100 torr, reaction gas composition: 4% TiCl 4 -5% CH 4 -91% H 2 , (b) For TiN Temperature: 980 ° C., pressure: 100 torr, reaction gas composition: 4% TiCl 4 -8% N 2 -88% H 2, when temperature of the (c) TiCN: 1000 ℃, pressure: 100 torr, the reaction gas composition: 4% TiCl 4 -3% CH 4 - % N 2 -89% H 2, when temperature of the (d) TiCNO: 1000 ℃, pressure: 100 torr, the reaction gas composition: 4% TiCl 4 -3% CO -3% N 2 -90% H 2, ( e) In the case of Al 2 O 3 Temperature: 1000 ° C., pressure: 100 torr, reaction gas composition: 3% AlCl 3 -5% CO 2 -92% H 2 , (the above reaction gas composition is volume% Indicates)
Then, cutting tools made of a surface-coated WC-based cemented carbide of the present invention (hereinafter referred to as coated cutting tips of the present invention) 1 to 6 were produced by forming a hard coating layer having the composition and the average layer thickness shown in Table 3. .
また、比較の目的で、上記の熱処理を施さない以外は
同一の条件で比較表面被覆WC基超硬合金製切削工具（以
下比較被覆切削チップという）１〜６をそれぞれ製造し
た。For the purpose of comparison, comparative surface-coated WC-based cemented carbide cutting tools (hereinafter referred to as comparative coated cutting tips) 1 to 6 were manufactured under the same conditions except that the above heat treatment was not performed.
上記の本発明被覆切削チップ１〜６および比較被覆切
削チップ１〜６の製造過程での測定および観察結果を第
2,3表に示した。The measurement and observation results during the manufacturing process of the coated cutting tips 1 to 6 of the present invention and the comparative coated cutting tips 1 to 6 are described below.
The results are shown in Tables 2 and 3.
さらに、この結果得られた本発明被覆切削チップ１〜
６および比較被覆切削チップ１〜６について、上記の条
件でＸ線回折を行なって、基本のWCの（211）面に現わ
れる波形を観察し、引続いて、 被削材:SNCM439（硬さ：HB270）、 切削速度：180m/min、 送 り：0.3mm/刃、 切込み： 3mm、 切削時間：40min、 の条件で鋼の乾式フライス切削試験を行ない、切刃の逃
げ面摩耗幅を測定すると共に、切刃状況も観察した。こ
れらの結果を第３表に示した。Furthermore, the coated cutting tips 1 to 5 of the present invention obtained as a result are
X-ray diffraction was performed on the No. 6 and comparative coated cutting tips 1 to 6 under the above conditions to observe the waveform appearing on the (211) plane of the basic WC. Subsequently, the work material: SNCM439 (hardness: H B 270), Cutting speed: 180m / min, feed: 0.3mm / tooth, depth of cut: 3mm, cutting time: 40min, dry milling test of steel is performed to measure the flank wear width of the cutting edge and the cutting edge. The situation was also observed. The results are shown in Table 3.
さらに第３表には、比較の目的で、配合組成をWC−６
％Co−３％（W,Ti）CN−３％TaCとし、焼結条件を、１
×10-3torrの真空中、温度:1470℃に１時間保持の条件
とすると共に、硬質被覆層をTiC:2μｍ（第１層）−Ti
N:1μｍ（第２層）で構成する以外は同一の条件で製造
した従来表面被覆WC基超硬合金製切削工具（以下従来被
覆切削チップという）の結果も示した。Table 3 shows the composition of WC-6 for comparison purposes.
% Co-3% (W, Ti) CN-3% TaC, and the sintering conditions were 1
In a vacuum of × 10 -3 torr, the temperature was kept at 1470 ° C. for 1 hour, and the hard coating layer was made of TiC: 2 μm (first layer) -Ti
The results of a conventional surface-coated WC-based cemented carbide cutting tool (hereinafter referred to as a conventional coated cutting tip) manufactured under the same conditions except that the composition is N: 1 μm (second layer) are also shown.
なお、上記従来被覆切削チップを構成するWC基超硬合
金基体は、硬質被覆層形成前の状態で、表面部のCo含有
量:9.3％、内部のCo含有量:5.9％を示し、内部に比して
表面部の方がCo含有量が高い表面軟化層を有するもので
あった。The WC-based cemented carbide substrate constituting the above-mentioned conventional coated cutting tip shows a Co content of 9.3% on the surface and 5.9% of Co inside, before forming the hard coating layer. In comparison, the surface portion had a surface softened layer having a higher Co content.
第2,3表に示される結果から、本発明被覆切削チップ
１〜６においては、これを構成するWC基超硬合金基体の
表面部が、いずれも内部に比してCo含有量が低く、かつ
WCが粗粒であり、かつＸ線回折でも第１図に模擬的に示
される分離波形を示し、この分離波形は硬質被覆層形成
後も示すものであり、この結果硬質被覆層の基体表面に
対する密着性が著しく向上したものになっているので、
切刃に欠損やチッピングの発生なく、すぐれた耐摩耗性
と耐欠損性を発揮するのに対して、比較被覆切削チップ
１〜６および従来被覆切削チップは、これを構成するWC
基超硬合金が、前者では表面部および内部とも均質であ
り、また後者では表面軟化層が存在するために、硬質被
覆層の基体表面に対する密着性が十分でなく、したがっ
ていずれも切削途中で、切刃の欠損やチッピング発生が
原因で使用寿命に至ることが明らかである。From the results shown in Tables 2 and 3, in the coated cutting tips 1 to 6 of the present invention, the surface portion of the WC-based cemented carbide substrate constituting the same has a lower Co content than any of the insides, And
The WC is coarse and the X-ray diffraction shows a separation waveform simulated in FIG. 1, which is also shown after the formation of the hard coating layer. Since the adhesion has been significantly improved,
While excellent wear resistance and chipping resistance are exhibited without causing chipping or chipping on the cutting edge, the comparative coated cutting tips 1 to 6 and the conventional coated cutting tip are composed of WC
The base cemented carbide is homogeneous in both the surface part and the inside in the former, and in the latter, because of the presence of the surface softening layer, the adhesion of the hard coating layer to the substrate surface is not sufficient. It is clear that the service life is extended due to the chipping of the cutting edge and the occurrence of chipping.
上述のように、この発明の表面被覆WC基超硬合金製切
削工具は、WC基超硬合金基体に対する硬質被覆層の密着
性にきわめてすぐれているので、特に硬質被覆層に高い
付着強度が要求されるフライス切削や仕上げ旋削に用い
た場合に、すぐれた耐摩耗性と耐欠損性を発揮し、長期
に亘る使用を可能とするなど工業上有用な特性を有する
のである。As described above, the surface-coated WC-based cemented carbide cutting tool of the present invention has excellent adhesion of the hard coating layer to the WC-based cemented carbide substrate, and therefore requires particularly high adhesion strength to the hard coating layer. When it is used for milling or finishing turning, it exhibits excellent wear resistance and fracture resistance, and has industrially useful characteristics such as long-term use.
第１図はこの発明の表面被覆WC基超硬合金製切削工具の
Ｘ線回折で、WCの（211）面に現われる分離波形を示す
図である。FIG. 1 is a view showing a separation waveform appearing on the (211) plane of WC by X-ray diffraction of a cutting tool made of a surface-coated WC-based cemented carbide according to the present invention.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−174380（ＪＰ，Ａ) 特開 昭58−67803（ＪＰ，Ａ) 特公 昭56−52111（ＪＰ，Ｂ２) 特公 昭60−5673（ＪＰ，Ｂ２) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-174380 (JP, A) JP-A-58-67803 (JP, A) JP-B-56-52111 (JP, B2) JP-B-60 5673 (JP, B2)
Claims (2)
のCo含有量を（Co）Iとした場合、重量％で、 （Co）S／（Co）I×100＜90％、 の関係式を満足すると共に、表面部における硬質相形成
成分としての炭化タングステンの平均粒径をWCS、内部
における炭化タングステンの平均粒径をWCIとした場
合、 の関係式を満足する炭化タングステン基超硬合金基体の
表面に、 元素周期律表の4a,5a,および6a族金属の炭化物、窒化
物、および酸化物、並びにこれらの２種以上の固溶体、
さらに酸化アルミニウムのうちの１種の単層または２種
以上の複層からなる硬質被覆層を形成してなる硬質被覆
層の密着性にすぐれた表面被覆炭化タングステン基超硬
合金製切削工具。When the Co content in the surface portion is (Co) S and the Co content in the inside is (Co) I , (Co) S / (Co) I × 100 <90% by weight%; And the average particle size of tungsten carbide as a hard phase forming component on the surface is WC S , and the average particle size of tungsten carbide inside is WC I , On the surface of the tungsten carbide-based cemented carbide substrate satisfying the relational expression, carbides, nitrides, and oxides of metals of Groups 4a, 5a, and 6a of the Periodic Table of the Elements, and solid solutions of two or more of these metals,
Further, a cutting tool made of a surface-coated tungsten carbide-based cemented carbide having an excellent adhesion of a hard coating layer formed by forming a hard coating layer composed of one kind of single layer or two or more kinds of aluminum oxide.
硬合金基体および硬質被覆層形成後の表面被覆炭化タン
グステン基超硬合金製切削工具が、その表面に対するＸ
線回折で、炭化タングステンの（211）面に、２つに分
離した高低差のある連続ピーク波形が現われる回折曲線
を示すことを特徴とする上記請求項１記載の硬質被覆層
の密着性にすぐれた表面被覆炭化タングステン基超硬合
金製切削工具。2. A cutting tool made of a tungsten carbide-based cemented carbide substrate before forming a hard coating layer and a surface-coated tungsten carbide-based cemented carbide tool after forming a hard coating layer has X
2. The hard coating layer according to claim 1, wherein the hard coating layer exhibits a diffraction curve in which a continuous peak waveform having a height difference separated into two appears on a (211) plane of tungsten carbide by line diffraction. Surface-coated tungsten carbide based cemented carbide cutting tool.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1220047A JP2748583B2 (en) | 1989-08-24 | 1989-08-24 | Surface-coated tungsten carbide based cemented carbide cutting tool with excellent adhesion of hard coating layer |
| US07/507,665 US5066553A (en) | 1989-04-12 | 1990-04-10 | Surface-coated tool member of tungsten carbide based cemented carbide |
| EP90106963A EP0392519B1 (en) | 1989-04-12 | 1990-04-11 | Surface-coated tool member of tungsten carbide based cemented carbide |
| DE69005348T DE69005348T2 (en) | 1989-04-12 | 1990-04-11 | Surface-coated tool part made of tungsten carbide based on tungsten carbide. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1220047A JP2748583B2 (en) | 1989-08-24 | 1989-08-24 | Surface-coated tungsten carbide based cemented carbide cutting tool with excellent adhesion of hard coating layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0382767A JPH0382767A (en) | 1991-04-08 |
| JP2748583B2 true JP2748583B2 (en) | 1998-05-06 |
Family
ID=16745095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1220047A Expired - Lifetime JP2748583B2 (en) | 1989-04-12 | 1989-08-24 | Surface-coated tungsten carbide based cemented carbide cutting tool with excellent adhesion of hard coating layer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2748583B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4528373B2 (en) * | 1997-02-20 | 2010-08-18 | 住友電工ハードメタル株式会社 | Coated tool and manufacturing method thereof |
| SE521488C2 (en) * | 2000-12-22 | 2003-11-04 | Seco Tools Ab | Coated cutting with iron-nickel-based bonding phase |
| EP2184122A1 (en) * | 2008-11-11 | 2010-05-12 | Sandvik Intellectual Property AB | Cemented carbide body and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0026082B1 (en) * | 1979-09-21 | 1983-07-20 | Wimet Limited | Drill |
| JPS5867803A (en) * | 1981-10-15 | 1983-04-22 | Hitachi Metals Ltd | Coated sintered hard alloy and preparation thereof |
| JPS605673A (en) * | 1983-06-23 | 1985-01-12 | Fuji Xerox Co Ltd | Facsimile equipment |
| JPH0684541B2 (en) * | 1986-01-27 | 1994-10-26 | 三菱マテリアル株式会社 | Surface coated titanium carbonitride based cermet cutting tool |
-
1989
- 1989-08-24 JP JP1220047A patent/JP2748583B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0382767A (en) | 1991-04-08 |
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