JP2564898B2 - Manufacturing method for surface coated tungsten carbide based cemented carbide cutting tools - Google Patents
Manufacturing method for surface coated tungsten carbide based cemented carbide cutting toolsInfo
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- JP2564898B2 JP2564898B2 JP63170187A JP17018788A JP2564898B2 JP 2564898 B2 JP2564898 B2 JP 2564898B2 JP 63170187 A JP63170187 A JP 63170187A JP 17018788 A JP17018788 A JP 17018788A JP 2564898 B2 JP2564898 B2 JP 2564898B2
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- nitride
- tungsten carbide
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- carbide
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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、表面被覆炭化タングステン（以下WCで示
す）基超硬合金製切削工具を製造するに際して、硬質被
覆層の形成に先だつて基体となる焼結体チツプの表面部
に形成される軟化層を、圧粉体チツプの焼結と同時に形
成する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention, when manufacturing a cutting tool made of surface-coated tungsten carbide (hereinafter referred to as WC) -based cemented carbide, forms a substrate before forming a hard coating layer. The present invention relates to a method of forming a softening layer formed on the surface of a sintered body chip at the same time as sintering of a green compact chip.
従来、例えば特開昭53−131909号公報に記載されるよ
うに、 まず、元素周期律表の4a、5a、および6a族金属の炭化
物、窒化物、および炭窒化物のうちの１種または２種以
上と、Co、Ni、およびFeのうちの１種または２種以上を
含有する超硬合金の焼結体チツプを用意し、 この焼結体チツプを基体とし、これに靭性を付与して
工具寿命の延命化をはかるべく、この表面部に、 （ａ） 適宜厚さに、例えばCoメツキを施し、ついで加
熱温度、加熱時間、加熱雰囲気および圧力などを適宜選
択した状態で、上記基体に液相が発生する温度以上に加
熱する方法、 （ｂ） 基体中の結合金属であるCo、Ni、およびFeを、
その表面部にしみ出させる方法、 （ｃ） 上記基体を液相が発生する温度以上に加熱した
状態で、その表面より炭素を浸入させる方法、 以上（ａ）〜（ｃ）のいずれかの方法によつて10〜60
μｍの範囲内の深さに亘つて実質的にWCとCoからなり、
WC以外の炭化物、窒化物、および炭窒化物、並びにこれ
らの２種以上の複合固溶体が全く存在しない軟化層を形
成し、 この表面部に軟化層を形成した焼結体チツプの表面
に、通常の化学蒸着法あるいは物理蒸着法を用いて、元
素周期律表の4a、5a、および6a族金属の炭化物、窒化
物、炭窒化物、酸化物、炭酸化物、窒酸化物、および炭
窒酸化物、並び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
硬質被覆層を形成することにより表面被覆WC基超硬合金
製切削工具を製造する方法が知られている。Conventionally, for example, as described in JP-A-53-131909, first, one or two of carbides, nitrides, and carbonitrides of metals of groups 4a, 5a, and 6a of the periodic table of elements are used. A cemented carbide chip of a cemented carbide containing one or more of Co, Ni, and Fe, and using this sintered chip as a base, and imparting toughness to this. In order to prolong the service life of the tool, (a) Co plating is applied to this surface to an appropriate thickness, and then the heating temperature, heating time, heating atmosphere, pressure, etc. are appropriately selected, and then the above-mentioned substrate is formed. A method of heating above the temperature at which a liquid phase is generated, (b) Co, Ni and Fe, which are the binding metals in the substrate,
A method of exuding to the surface portion thereof, (c) a method of infiltrating carbon from the surface of the substrate in a state of being heated above the temperature at which a liquid phase is generated, any one of the above methods (a) to (c) According to 10-60
consisting essentially of WC and Co over a depth in the μm range,
Normally, the surface of the sintered body chip is formed on the surface of the sintered body chip where a softening layer free of carbides, nitrides, and carbonitrides other than WC and a composite solid solution of two or more of these is present, and a softening layer is formed on this surface. By using the chemical vapor deposition method or physical vapor deposition method of 4a, 5a, and 6a metals of the Periodic Table of Elements, carbides, nitrides, carbonitrides, oxides, carbonates, oxynitrides, and oxycarbonitrides. , And a hard-coated layer composed of a single layer of aluminum oxide (hereinafter referred to as Al 2 O 3 ) or a multi-layer of two or more types to produce a surface-coated WC-based cemented carbide cutting tool It is known how to do it.
しかし、上記の従来方法においては、焼結体チツプの
表面部に軟化層を形成するのに別工程を必要とするた
め、熱的および工程的に不経済であるばかりでなく、軟
化層の深さを制御することがきわめて困難であるという
問題点がある。However, in the above-mentioned conventional method, since a separate step is required to form the softening layer on the surface of the sintered body chip, it is not only economically and thermally uneconomical, but also the depth of the softening layer is increased. It is extremely difficult to control the height.
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の製造法のもつ
問題点を解決すべく研究を行なつた結果、 まず、複合固溶体の配合組成を、重量％で（以下％は
重量％を示す）、 （１） Co:3〜10％、 Ti、Ta、Nb、およびＷの窒化物および炭窒化物、並び
にこれらの２種以上の複合固溶体（ただし、Ｗの窒化物
と炭窒化物は除き、かつこれらを総称して（Ti,Ta,Nb,
W）（Ｃ）Ｎで示す）のうちの１種または２種以上（２
種以上の場合は合量で、以下同じ）:0.5〜20％、 WCおよび不可避不純物：残り、 とするか、あるいは、 （２） Co:3〜10％、 （Ti,Ta,Nb,W）（Ｃ）Ｎのうちの１種または２種以
上:0.5〜20％、 Ti、Ta、Nb、およびＷの炭化物、並びにこれらの２種
以上の複合炭化物（ただしWCは除き、かつこれらを総称
して（Ti,Ta,Nb,W）Ｃで示す）のうちの１種または２種
以上:0.5〜30％、 WCおよび不可避不純物：残り、 に限定すると共に、焼結後に表面部に均一な深さに亘つ
て軟化層を形成する目的で、この圧粉体チツプの形状
を、面取りされたホーニング形状とし、 ついで、この圧粉体チツプを、１×10-1〜１×10-4to
rrの真空中、1350〜1450℃の範囲内の温度で焼結する
と、圧粉体チツプに配合された（Ti,Ta,Nb,W）（Ｃ）Ｎ
と焼結雰囲気との作用によつて表面部に焼結と同時に軟
化層が形成されるようになり、しかもこの場合、焼結雰
囲気の真空度および（Ti,Ta,Nb,W）（Ｃ）Ｎの配合量を
調整することによつて軟化層の深さを自由に、かつ正確
に制御することができるという知見を得たのである。Therefore, the present inventors, from the above viewpoints, as a result of conducting research to solve the problems with the conventional method of manufacturing a surface-coated WC-based cemented carbide cutting tool, as a result, first, a composite solid solution (1) Co: 3 to 10%, nitrides and carbonitrides of Ti, Ta, Nb, and W, and two or more of them in a composition by weight (hereinafter,% represents weight%). Composite solid solution (however, except for the nitrides and carbonitrides of W, and generically (Ti, Ta, Nb,
W) (C) N) or more than one (2)
In the case of more than one species, the total amount is the same): 0.5-20%, WC and unavoidable impurities: The rest, or (2) Co: 3-10%, (Ti, Ta, Nb, W) (C) One or more of N: 0.5 to 20%, carbides of Ti, Ta, Nb, and W, and composite carbides of two or more of these (however, excluding WC, and generically (Ti, Ta, Nb, W) C) or 2 or more: 0.5 to 30%, WC and unavoidable impurities: Remaining For the purpose of forming a softened layer over the entire length, the shape of this green compact chip is made into a chamfered honing shape, and then this green compact chip is 1 × 10 -1 to 1 × 10 -4 to
When sintered at a temperature in the range of 1350 to 1450 ° C in a vacuum of rr, (Ti, Ta, Nb, W) (C) N was compounded into the powder compact chip.
And the sintering atmosphere causes a softening layer to be formed on the surface simultaneously with the sintering, and in this case, the degree of vacuum of the sintering atmosphere and (Ti, Ta, Nb, W) (C) It was found that the depth of the softening layer can be freely and accurately controlled by adjusting the blending amount of N.
この発明は、上記知見にもとづいてなされたものであ
つて、 Co:3〜10％、 （Ti,Ta,Nb,W）（Ｃ）Ｎのうちの１種または２種以
上:0.5〜20％、 を含有し、さらに必要に応じて、 （Ti,Ta,Nb,W）Ｃのうちの１種または２種以上:0.5〜
30％、 を含有し、残りがWCと不可避不純物からなる配合組成を
有し、かつ面取りされたホーニング形状を有する圧粉体
チツプをプレス成形し、 この圧粉体チツプを、１×10-1〜１×10-4torrの真空
中、1350〜1450℃の範囲内の温度で焼結して、表面部に
10〜60μｍの範囲内の深さに亘つて、実質的にWCとCoか
らなる軟化層を有する焼結体チツプを成形し、 この焼結体チツプの表面に、Tiの炭化物、窒化物、炭
窒化物、炭酸化物、および炭窒酸化物、ZrおよびHfの窒
化物、並びに酸化アルミニウム（以下、それぞれTiC、T
iN、TiCN、TiCO、TiCNO、ZrN、HfN、および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２〜15μｍの範囲内の平均層厚で形成する
ことからなる表面被覆WC基超硬合金製切削工具の製造法
に特徴を有するものである。The present invention has been made based on the above findings, in which Co: 3 to 10%, (Ti, Ta, Nb, W) (C) N, one or more of: 0.5 to 20% , And, if necessary, one or more of (Ti, Ta, Nb, W) C: 0.5 to
30%, and the balance of the composition is WC and inevitable impurities, and a pressed powder chip having a chamfered honing shape is press-molded to obtain 1 × 10 -1 Sinter at a temperature in the range of 1350 to 1450 ° C in a vacuum of ~ 1 × 10 -4 torr, and
A sintered body chip having a softened layer consisting essentially of WC and Co is formed over a depth within the range of 10 to 60 μm, and Ti carbide, nitride, charcoal is formed on the surface of the sintered body chip. Nitride, carbon oxide, carbonitride oxide, Zr and Hf nitride, and aluminum oxide (hereinafter TiC, T, respectively)
iN, TiCN, TiCO, TiCNO, ZrN, HfN, and Al 2 O 3 ), a hard coating layer consisting of one single layer or two or more multi layers, and an average layer in the range of 2 to 15 μm. It is characterized by a method of manufacturing a surface-coated WC-based cemented carbide cutting tool that is formed by forming a thick layer.
つぎに、この発明の方法において、製造条件を上記の
通りに限定した理由を説明する。Next, the reason why the manufacturing conditions are limited as described above in the method of the present invention will be described.
A.配合組成 （ａ） Co Co成分には、焼結体チツプに靭性を付与する作用があ
るが、その含有量が３％未満では所望の靭性を確保する
ことができず、切削工具として用いた場合に、折損や欠
けが発生し易くなり、一方その含有量が10％を越える
と、切削工具の耐熱塑性変形性および耐摩耗性が低下す
るようになることから、その含有量を３〜10％と定め
た。A. Blend composition (a) Co Co component has the effect of imparting toughness to the sintered body chip, but if the content is less than 3%, the desired toughness cannot be secured, and it is used as a cutting tool. If the content exceeds 10%, the heat plastic deformation resistance and wear resistance of the cutting tool will decrease, so the content should be 3 to 3%. It was set at 10%.
（ｂ） （Ti,Ta,Nb,W）（Ｃ）Ｎ これらの成分には、焼結時に、焼結雰囲気と関連し
て、焼結体チツプの表面に、実質的にWCとCoからなる軟
化層を形成する作用があり、したがつてその含有量が0.
5％未満では所望の深さ、すなわち10μｍ以上の深さの
軟化層を形成することができず、一方その含有量が20％
を越えても、軟化層の形成が抑制されるようになり、10
μｍ以上の深さの軟化層を形成するのが困難になること
から、その含有量を0.5〜20％と定めた。(B) (Ti, Ta, Nb, W) (C) N These components substantially consist of WC and Co on the surface of the sintered body chip in association with the sintering atmosphere during sintering. It has the effect of forming a softening layer, so its content is 0.
If it is less than 5%, a softened layer having a desired depth, that is, a depth of 10 μm or more cannot be formed, while its content is 20%.
Even if it exceeds, the formation of the softening layer will be suppressed,
Since it becomes difficult to form a softened layer having a depth of μm or more, its content is set to 0.5 to 20%.
（ｃ） （Ti,Ta,Nb,W）Ｃ これらの成分には、焼結体チツプの硬さを向上させ、
もつて切削工具の耐摩耗性を向上させる作用があるの
で、必要に応じて含有されるが、その含有量が0.5％未
満では所望の耐摩耗性向上効果が得られず、一方その含
有量が30％を越えると、切削工具の耐欠損性が低下する
ようになることから、その含有量を0.5〜30％と定め
た。(C) (Ti, Ta, Nb, W) C These components improve the hardness of the sintered body chip,
Since it has the effect of improving the wear resistance of the cutting tool, it is contained as necessary, but if the content is less than 0.5%, the desired wear resistance improving effect cannot be obtained, while the content is If it exceeds 30%, the fracture resistance of the cutting tool will decrease, so its content was set to 0.5 to 30%.
B.焼結条件 （ａ） 真空度 真空度が１×10-1torrを越えて低くなると、所望の深
さに亘つて軟化層を形成することができないので、１×
10-1torr以上の真空度での雰囲気で焼結する必要があ
り、したがつて１×10-1torr以上の真空度での焼結であ
れば何ら問題はないが、あまり高い真空度での焼結は実
用的でないので、その上限を10-4torrと定めた。B. Sintering conditions (a) Vacuum degree If the vacuum degree becomes lower than 1 × 10 -1 torr, the softened layer cannot be formed over a desired depth, and thus 1 ×
It is necessary to sinter in an atmosphere with a vacuum degree of 10 -1 torr or higher. Therefore, there is no problem if sintering is performed in a vacuum degree of 1 × 10 -1 torr or higher, but with a very high vacuum degree. Since the sintering of is not practical, the upper limit was set to 10 -4 torr.
（ｂ） 焼結温度 完全な焼結と軟化層の形成には1350℃以上の温度が必
要であり、一方その温度が1450℃を越えると、軟化層の
深さが60μｍを越えて大きくなつてしまい、切削工具の
耐熱塑性変形性および耐摩耗性が低下するようになるこ
とから、その温度を1350〜1450℃と定めた。(B) Sintering temperature A temperature of 1350 ° C or higher is required for complete sintering and formation of the softened layer, while if the temperature exceeds 1450 ° C, the depth of the softened layer exceeds 60 μm and increases. Therefore, the heat plastic deformation and wear resistance of the cutting tool deteriorate, so the temperature was set at 1350 to 1450 ℃.
c.軟化層の深さ 焼結体チツプの表面部に形成される軟化層の深さが10
μｍ未満では、上記の通り所望の靭性向上は見られず、
耐欠損性改善効果は十分でなく、一方その深さが60μｍ
を越えると、切削工具に耐熱塑性変形性および耐摩耗性
の低下をもたらすようになることから、その深さを10〜
60μｍと定めた。c. Depth of softening layer The depth of the softening layer formed on the surface of the sintered body chip is 10
If it is less than μm, the desired improvement in toughness is not observed as described above,
The effect of improving fracture resistance is not sufficient, while the depth is 60 μm
If it exceeds the range, the cutting tool will suffer a decrease in heat plastic deformation and wear resistance.
It was set to 60 μm.
D.硬質被覆層の平均層厚 その平均層厚が２μｍ未満では所望の耐摩耗性向上効
果が得られず、一方その平均層厚が15μｍを越えると、
耐欠損性が低下し、切刃に開けやチツピングが発生し易
くなることから、その平均層厚を２〜15μｍと定めた。D. Average layer thickness of hard coating layer If the average layer thickness is less than 2 μm, the desired effect of improving wear resistance cannot be obtained, while if the average layer thickness exceeds 15 μm,
Since the fracture resistance is lowered and the cutting edge is likely to be opened or chipped, the average layer thickness is set to 2 to 15 μm.
つぎに、この発明の製造法を実施例により具体的に説
明する。Next, the manufacturing method of the present invention will be specifically described with reference to Examples.
まず、原料粉末として、いずれも３〜４μｍの範囲内
の所定の平均粒経を有するWC粉末、各種の（Ti,Ta,Nb,
W）（Ｃ）Ｎ粉末および（Ti,Ta,Nb,W）Ｃ粉末、さらにC
o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
混合し、乾燥した後、圧粉体チツプのコーナー部に相当
する部分を0.1mm×20゜のチヤンフアー・ホーニング形
状としたプレス金型を用い、15kg/mm2の圧力にてプレス
して面取りされた前記ホーニング形状を有する圧粉体チ
ツプを成形し、ついでこれら 圧粉体チツプをそれぞれ第１表に示される焼結条件で焼
結し、引続いて、この結果得られた焼結体チツプの表面
に、通常の化学蒸着法あるいは物理蒸着法を用い、通常
の条件で同じく第１表に示される組成並びに平均層厚の
硬質被覆層を形成することにより本発明法１〜28および
比較法１〜10を実施し、それぞれ形状がTNMG432（内接
円:12.7mm×厚さ:4.8mm×ノーズ:0.8mmの両面型全周ブ
レーカーチツプの本発明表面被覆WC基超硬合金製切削工
具（以下本発明被覆超硬工具という）１〜28および比較
表面被覆WC基超硬合金製切削工具（以下比較被覆超硬工
具という）１〜10を製造した。また、第１表には、上記
焼結体チツプの中心部および軟化層の深さ方向中心部の
ビツカース硬さ、軟化層の深さの測定結果も示した。First, as raw material powders, WC powders each having a predetermined average particle size in the range of 3 to 4 μm, various (Ti, Ta, Nb,
W) (C) N powder and (Ti, Ta, Nb, W) C powder, and further C
o Prepare powder, mix each of these raw material powders with the composition shown in Table 1, wet mix with a ball mill for 72 hours, dry, and then dry the parts corresponding to the corners of the green compact chip with 0.1 parts. Using a press die having a mm × 20 ° chamfer honing shape, the chamfered green compact chip having the aforementioned honing shape is formed by pressing at a pressure of 15 kg / mm 2. Each of the green compact chips was sintered under the sintering conditions shown in Table 1, and subsequently, on the surface of the sintered body chip obtained as a result, an ordinary chemical vapor deposition method or physical vapor deposition method was used. The invention methods 1-28 and comparative methods 1-10 were carried out by forming a hard coating layer having the same composition and average layer thickness as shown in Table 1 under the conditions of No. 1, and the shape was TNMG432 (inscribed circle: 12.7). mm-thickness: 4.8 mm x nose: 0.8 mm double-sided all-round breaker chip of the present invention surface-coated WC-based cemented carbide cutting tool (hereinafter referred to as the present invention coated carbide tool) 1-28 and comparative surface-coated WC Base cemented carbide cutting tools (hereinafter referred to as comparative coated cemented carbide tools) 1 to 10 were produced, and Table 1 shows Vickers at the center of the sintered body chip and the center of the softened layer in the depth direction. The measurement results of the hardness and the depth of the softened layer are also shown.
なお、比較法１〜10は、いずれも製造条件のうちのい
ずれかの条件（第１表に※印を付す）がこの発明の範囲
から外れたものである。In Comparative Examples 1 to 10, any one of the manufacturing conditions (marked with * in Table 1) is out of the scope of the present invention.
つぎに、この結果得られた各種の被覆超硬工具 を用い、 被削材:JIS・SNCM439（硬さ:HB260）、 切削速度:200m/min、 送り:0.35mm/rev.、 切込み:2mm、 切削時間:30min、 の条件で鋼の連続切削試験を行ない、切刃の逃げ面摩耗
幅を測定し、また、長さ:1000mmの回転ドラムの長さ方
向両側に、断面形状:150mm×200mm、長さ:800mmの被削
材を設置した状態で、 被削材:JIS・SNCM439（硬さ:HB260）、 切削速度:100m/min、 送り:0.45mm/rev.、 切込み:3mm、 切削時間:3min、 の条件で鋼の断続切削試験を行ない、20個の試験切刃数
のうち欠損発生数を測定した。これらの測定結果を第２
表に示した。Next, various coated carbide tools obtained as a result of this Using, workpiece: JIS · SNCM439 (Hardness: H B 260), Cutting speed: 200 meters / min, Feed:. 0.35 mm / rev, cut: 2 mm, cutting time: 30min, condition continuous steel at cutting A test was conducted to measure the flank wear width of the cutting edge, and a workpiece with a cross-sectional shape of 150 mm x 200 mm and a length of 800 mm was installed on both sides in the length direction of a rotating drum with a length of 1000 mm. in, workpiece: JIS · SNCM439 (hardness: H B 260), cutting speed: 100 m / min, feed:. 0.45 mm / rev, cut: 3 mm, cutting time: 3min, intermittent cutting test of steel in the conditions Was carried out, and the number of occurrence of defects was measured out of the number of 20 test cutting edges. These measurement results are second
Shown in the table.
第１表および第２表に示される結果から、本発明法１
〜28によれば、焼結体チツプの表面部に焼結と同時に軟
化層を形成することができ、しかもこの軟化層の深さ
は、圧粉体チツプ中の（Ti,Ta,Nb,W）（Ｃ）Ｎの含有量
および焼結雰囲気の真空度を調整することによつて容易
に、かつ正確に制御することができ、さらにこれらの方
法によつて製造された本発明被覆超硬工具１〜28は、い
ずれも耐欠損性（靭性）、耐熱塑性変形性、および耐摩
耗性にすぐれているので、連続切削は勿論のこと、断続
切削においてもすぐれた切削性能を発揮するのに対し
て、製造条件のうちのいずれかの条件がこの発明の範囲
から外れた比較法１〜10によつて製造された比較被覆超
硬工具１〜10は、耐欠損性、耐塑性変形性、および耐摩
耗性のうちの少なくともいずれかの特性が劣るので、十
分満足する切削性能を示さないことが明らかである。From the results shown in Tables 1 and 2, the method 1 of the present invention
According to 28 to 28, a softening layer can be formed on the surface of the sintered body chip at the same time as sintering, and the depth of the softening layer is (Ti, Ta, Nb, W in the green compact chip). ) (C) The content of (N) and the degree of vacuum of the sintering atmosphere can be easily and accurately controlled, and the coated cemented carbide tool of the present invention produced by these methods. Nos. 1 to 28 have excellent fracture resistance (toughness), heat plastic deformation, and wear resistance, so they exhibit excellent cutting performance not only in continuous cutting but also in interrupted cutting. The comparative coated cemented carbide tools 1 to 10 manufactured by the comparative methods 1 to 10 in which any of the manufacturing conditions are out of the scope of the present invention have fracture resistance, plastic deformation resistance, and Since at least one of the wear resistance is inferior, sufficient cutting performance is not shown. It is clear.
上述のように、この発明の方法によれば、別工程を必
要とすることなく、焼結と同時に焼結体チツプの表面に
所定の深さに亘つて軟化層を形成する状態で、耐欠損性
（靭性）、耐塑性変形性、および耐摩耗性にすぐれた表
面被覆WC基超硬合金製切削工具を製造することができる
のである。As described above, according to the method of the present invention, it is possible to form a softening layer over a predetermined depth on the surface of a sintered body chip at the same time as sintering without requiring a separate step, and to prevent fracture resistance. It is possible to manufacture a surface-coated WC-based cemented carbide cutting tool having excellent toughness (plasticity), plastic deformation resistance, and wear resistance.
Claims (2)
これらの２種以上の複合固溶体（ただしＷの窒化物と炭
窒化物は除く）のうちの１種または２種以上（ただし２
種以上の場合は合量で）:0.5〜20％、 を含有し、残りが炭化タングステンと不可避不純物から
なる配合組成（以上重量％）を有し、かつ面取りされた
ホーニング形状を有する圧粉体チツプをプレス成形し、 この圧粉体チツプを、１×10-1〜１×10-4torrの真空
中、1350〜1450℃の範囲内の温度で焼結して、表面部に
10〜60μｍの範囲内の深さに亘つて、実質的に炭化タン
グステンとCoからなる軟化層を有する焼結体チツプを成
形し、 この焼結体チツプの表面に、Tiの炭化物、窒化物、炭窒
化物、炭酸化物、および炭窒酸化物、ZrおよびHfの窒化
物、並び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２〜15μｍの範囲
内の平均層厚で形成することを特徴とする表面被覆炭化
タングステン基超硬合金製切削工具の製造法。1. A nitride and a carbonitride of Ti, Ta, Nb, and W, and a composite solid solution of two or more thereof (however, a nitride of W and 1 type or 2 or more types (excluding carbonitrides)
In the case of more than one kind, the total amount): 0.5-20%, and the rest has a compounding composition (above wt%) consisting of tungsten carbide and unavoidable impurities, and has a chamfered honing shape. The chip is press-molded, and the green compact chip is sintered in a vacuum of 1 × 10 -1 to 1 × 10 -4 torr at a temperature in the range of 1350 to 1450 ° C.
A sintered body chip having a softening layer consisting essentially of tungsten carbide and Co is formed over a depth in the range of 10 to 60 μm, and Ti carbide, nitride, and Within a range of 2 to 15 μm, a hard coating layer consisting of a single layer or two or more layers of carbonitride, carbon oxide, carbonitride oxide, Zr and Hf nitride, and aluminum oxide. A method for manufacturing a surface-coated tungsten carbide-based cemented carbide cutting tool, characterized in that the cutting tool is formed with an average layer thickness of.
これらの２種以上の複合固溶体（ただしＷの窒化物と炭
窒化物は除く）のうちの１種または２種以上（ただし２
種以上の場合は合量で）:0.5〜20％、 を含有し、さらに、 Ti、Ta、Nb、およびＷの炭化物、並びにこれらの２種以
上の複合炭化物（ただしＷの炭化物は除く）のうちの１
種または２種以上（２種以上の場合は合量で）:0.5〜30
％、 を含有し、残りが炭化タングステンと不可避不純物から
なる配合組成（以上重量％）を有し、かつ面取りされた
ホーニング形状を有する圧粉体チツプをプレス成形し、 この圧粉体チツプを、１×10-1〜１×10-4torrの真空
中、1350〜1450℃の範囲内の温度で焼結して、表面部に
10〜60μｍの範囲内の深さに亘つて、実質的に炭化タン
グステンとCoからなる軟化層を有する焼結体チツプを成
形し、 この焼結体チツプの表面に、Tiの炭化物、窒化物、炭窒
化物、炭酸化物、および炭窒酸化物、ZrおよびHfの窒化
物、並び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２〜15μｍの範囲
内の平均層厚で形成することを特徴とする表面被覆炭化
タングステン基超硬合金製切削工具の製造法。2. Co: 3-10%, nitrides and carbonitrides of Ti, Ta, Nb, and W, and composite solid solutions of two or more of these (excluding W nitrides and carbonitrides). 1 or 2 or more (2
0.5 to 20%, and further includes Ti, Ta, Nb, and W carbides, and two or more of these composite carbides (excluding W carbides). One of them
Seed or 2 or more (in case of 2 or more, total amount): 0.5 to 30
%, With the balance being tungsten carbide and unavoidable impurities in the balance (above wt%) and having a chamfered honing shape, the green compact chip is press-molded. Sinter at a temperature in the range of 1350 to 1450 ° C in a vacuum of 1 × 10 -1 to 1 × 10 -4 torr, and
A sintered body chip having a softening layer consisting essentially of tungsten carbide and Co is formed over a depth in the range of 10 to 60 μm, and Ti carbide, nitride, and Within a range of 2 to 15 μm, a hard coating layer consisting of a single layer or two or more layers of carbonitride, carbon oxide, carbonitride oxide, Zr and Hf nitride, and aluminum oxide. A method for manufacturing a surface-coated tungsten carbide-based cemented carbide cutting tool, characterized in that the cutting tool is formed with an average layer thickness of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170187A JP2564898B2 (en) | 1988-05-17 | 1988-07-08 | Manufacturing method for surface coated tungsten carbide based cemented carbide cutting tools |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11957588 | 1988-05-17 | ||
| JP63-119575 | 1988-05-17 | ||
| JP63170187A JP2564898B2 (en) | 1988-05-17 | 1988-07-08 | Manufacturing method for surface coated tungsten carbide based cemented carbide cutting tools |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0257616A JPH0257616A (en) | 1990-02-27 |
| JP2564898B2 true JP2564898B2 (en) | 1996-12-18 |
Family
ID=26457267
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63170187A Expired - Lifetime JP2564898B2 (en) | 1988-05-17 | 1988-07-08 | Manufacturing method for surface coated tungsten carbide based cemented carbide cutting tools |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2564898B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2512520Y2 (en) * | 1991-02-02 | 1996-10-02 | 全吉 蟹由 | Fasteners such as screws, nails or bolts. |
-
1988
- 1988-07-08 JP JP63170187A patent/JP2564898B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0257616A (en) | 1990-02-27 |
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