JP2668977B2 - Cutting tool made of tungsten carbide based cemented carbide with excellent fracture resistance - Google Patents
Cutting tool made of tungsten carbide based cemented carbide with excellent fracture resistanceInfo
- Publication number
- JP2668977B2 JP2668977B2 JP63223297A JP22329788A JP2668977B2 JP 2668977 B2 JP2668977 B2 JP 2668977B2 JP 63223297 A JP63223297 A JP 63223297A JP 22329788 A JP22329788 A JP 22329788A JP 2668977 B2 JP2668977 B2 JP 2668977B2
- Authority
- JP
- Japan
- Prior art keywords
- cutting
- carbide
- cemented carbide
- based cemented
- cutting tool
- 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
Links
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、すぐれた耐欠損性を有し、特に高速切削
や、高送り切削および高切込みなどの苛酷な条件下での
断続切削やフライス切削などに用いた場合に、すぐれた
切削性能を発揮する炭化タングステン（以下WCで示す）
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 has excellent fracture resistance, and in particular, intermittent cutting and milling under severe conditions such as high speed cutting, high feed cutting and high cutting depth. Tungsten carbide which exhibits excellent cutting performance when used for cutting, etc. (hereinafter referred to as WC)
The present invention relates to a base cemented carbide cutting tool.
一般に、鋼や鋳鉄などの断続切削やフライス切削など
に、 結合相形成成分としてCo,Ni、およびFeのうちの１種
または２種以上:10〜25％、 分散相形成成分としてTi,Ta,Nb、およびＷの炭化物、
窒化物、および炭窒化物、並びにこれらの２種以上の固
溶体（ただしＷの炭化物、窒化物、および炭窒化物を除
く）のうちの１種または２種以上:4〜25％、 を含有し、残りが同じく分散相成形成分としてのWCと不
可避不純物からなる組成（以上重量％、以下％重量％を
示す）を有するWC基超硬合金で構成された切削工具が用
いられている。Generally, for interrupted cutting or milling of steel or cast iron, one or more of Co, Ni, and Fe as a binder phase forming component: 10 to 25%, and Ti, Ta, Nb and W carbides,
One or more of nitride and carbonitride, and two or more of these solid solutions (excluding carbides, nitrides and carbonitrides of W): 4 to 25% A cutting tool composed of a WC-based cemented carbide having a composition (more than or equal to% by weight, hereinafter referred to as% by weight) composed of WC as a dispersed phase forming component and unavoidable impurities is used.
しかし、近年の切削工程の省力化および高速化に対す
る要求は厳しく、これに伴って高速切削や、高送りおよ
び高切込みなどの重切削を余儀無くされる傾向にある
が、上記の従来のWC基超硬合金製切削工具を用いて断続
切削やフライス切削を、高速切削や重切削などの苛酷な
条件で行なった場合、耐欠損性不足が原因で切刃に欠損
やチッピングが発生し、この結果摩耗が促進されるよう
になることから、比較的短時間で使用寿命に至るのが現
状である。However, in recent years, demands for labor saving and speeding up of the cutting process are strict, and along with this, there is a tendency to be forced to perform high-speed cutting and heavy cutting such as high feed and high depth of cut. When performing intermittent cutting or milling using hard alloy cutting tools under severe conditions such as high-speed cutting or heavy cutting, chipping or chipping occurs on the cutting edge due to insufficient chipping resistance, resulting in wear. Is promoted, so that the service life can be reached in a relatively short time at present.
そこで、本発明者等は、上述のような観点から、上記
の従来WC基超硬合金製切削工具に着目し、これに耐欠損
性を付与すべく研究を行なった結果、前記従来WC基超硬
合金製切削工具を構成するWC基超硬合金の結合相形成成
分および分散相形成成分を特定した上で、これに、窒化
チタンおよび炭窒化チタン（以下、それぞれTiNおよびT
iCNで示し、これら全体をTi（Ｃ）Ｎで示す）ホイスカ
のいずれか、または両方を、合金全体に占める割合で５
〜40％含有させると、すぐれた耐欠損性をもつようにな
り、したがってこの結果のWC基超硬合金で構成された切
削工具は、断続切削やフライス切削を、高速切削や重切
削などの苛酷な条件下で行なっても、切刃に欠損やチッ
ピンクの発生がなくなり、すぐれた耐摩耗性を長期に亘
って発揮するという知見を得たものである。In view of the above, the present inventors focused on the above-mentioned conventional WC-based cemented carbide cutting tool, and conducted research to impart chipping resistance thereto. After identifying the binder phase forming component and the disperse phase forming component of the WC-based cemented carbide that constitutes the hard metal cutting tool, titanium nitride and titanium carbonitride (hereinafter TiN and T
One or both of the whiskers (indicated by iCN, all of which are indicated by Ti (C) N) are 5% of the total alloy.
Up to 40% content results in excellent fracture resistance, and as a result, cutting tools composed of WC-based cemented carbide can be used for cutting and milling, as well as for severe cutting such as high-speed cutting and heavy cutting. It has been found that even when the cutting is carried out under such conditions, the cutting edge is free from chipping and chipping, and exhibits excellent wear resistance over a long period of time.
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、 結合相形成成分としてCo:5〜20％、 分散形成成分としてTiと、Ta,Nb、およびＷのうちの
１種または２種以上との複合炭化物［以下、（Ti,M）Ｃ
で示す］:0.5〜30％、 同じく分散相形成成分としてTiN・ホイスカおよび／
またはTiCN・ホイスカ:5〜40％、 を含有し、残りが分散相形成成分としてのWCと不可避不
純物からなる組成を有するWC切超硬合金で構成された、
すぐれた耐欠損性を有するWC基超硬合金製切削工具に特
徴を有するものである。The present invention has been made on the basis of the above-mentioned findings, wherein Co: 5 to 20% as a binder phase-forming component, Ti as a dispersion-forming component, and one or more of Ta, Nb, and W. Composite carbide with [[hereinafter, (Ti, M) C
]: 0.5 to 30%, also TiN whiskers and / or
Or TiCN / whisker: 5-40%, and the rest is composed of WC-cut cemented carbide having a composition consisting of WC as a dispersed phase forming component and unavoidable impurities,
It is characterized by a WC-based cemented carbide cutting tool with excellent fracture resistance.
つぎに、この発明の切削工具において、これを構成す
るWC基超硬合金の成分組成を上記の通りに限定した理由
を説明する。Next, the reason why the component composition of the WC-based cemented carbide constituting the cutting tool of the present invention is limited as described above will be described.
（ａ） Co Co成分には、分散相と強固に結合し、強度および靭性
を向上させる作用があるが、その含有量が５％未満では
前記作用に所望の効果が得られず、一方その含有量が20
％を越えると硬さ低下が著しく、耐摩耗性が低下するよ
うになることから、その含有量を５〜20％と定めた。(A) Co The Co component has a function of firmly binding to the dispersed phase and improving the strength and toughness, but if its content is less than 5%, the desired effect cannot be obtained in the above-mentioned effect. Quantity 20
%, The hardness is remarkably lowered and the wear resistance is lowered. Therefore, the content is set to 5 to 20%.
（ｂ） （Ti,M）Ｃ （Ti,M）Ｃ成分には、合金の硬さを高めて、耐摩耗性
を向上させる作用があるが、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％を越えると靭性が低下し、耐欠損性が損なわれる
ようになることから、その含有量を0.5〜30％と定め
た。(B) (Ti, M) C The (Ti, M) C component has the effect of increasing the hardness of the alloy and improving the wear resistance. If the content is less than 0.5%, the desired wear resistance is obtained. When the content exceeds 30%, the toughness is reduced and the fracture resistance is impaired. Therefore, the content is set to 0.5 to 30%.
（ｃ） Ti（Ｃ）Ｎホイスカ これらの成分には、上記の通り耐欠損性を飛躍的に向
上させる作用があるが、その含有量が５％未満では所望
のすぐれた耐欠損性を確保することができず、一方その
含有量が40％を越えると素地中に均一に分散分布させる
ことが困難になり、局部的材質ムラが生ずるようになる
ことから、その含有量を５〜40％と定めた。(C) Ti (C) N whisker These components have the effect of dramatically improving the fracture resistance as described above, but if the content is less than 5%, the desired excellent fracture resistance is secured. On the other hand, if the content exceeds 40%, it becomes difficult to uniformly disperse and distribute in the base material, and local material unevenness occurs, so the content is limited to 5 to 40%. Specified.
つぎに、この発明の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, a cutting tool made of a 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１〜5.5μｍの範囲内の平
均粒径を有するWC粉末、（Ti,Ta,W）Ｃ［重量比で、TiC
/TaC/WC＝30/20/50］粉末、（Ti,W）Ｃ［重量比で、TiC
/WC＝30/70］粉末、およびCo粉末を用意し、さらに10〜
100の範囲内のアスペクト比（長さ／径）を有するTiN・
ホイスカおよびTiCN・ホイスカを用意し、これら原料を
それぞれ第１表に示される配合組成に配合し、ホイスカ
を除く原料粉末をボールミルにて72時間湿式混合し、つ
いでこれにホイスカを加えて軽く混合し、乾燥した後、
10ton/cm2の圧力で圧粉体にプレス成形し、この圧粉体
に、１×10-2torrの真空中、温度:1380〜1400℃の条件
で真空焼結、または温度:1380〜1400℃、圧力:200 kg/cm2の条件でのホットプレスを施し、研磨してSPP422
の形状をもち、かつ実質的に配合組成と同一の成分組成
をもった本発明WC基超硬合金製スローアウェイチップ
（以下本発明超硬チップという）１〜３、およびホイス
カの含有がない比較WC基超硬合金製スローアウェイチッ
プ（以下比較超硬チップという）１〜３をそれぞれ製造
した。As the raw material powder, WC powders each having an average particle diameter in the range of 1 to 5.5 μm, (Ti, Ta, W) C [by weight ratio, TiC
/ TaC / WC = 30/20/50] powder, (Ti, W) C [by weight, TiC
/ WC = 30/70] powder and Co powder are available.
TiN with aspect ratio (length / diameter) in the range of 100
Prepare whiskers and TiCN whiskers, mix each of these raw materials to the mixing composition shown in Table 1, wet mix the raw material powder excluding whiskers in a ball mill for 72 hours, then add whiskers to this and mix gently. , After drying,
It is press-formed into a green compact at a pressure of 10 ton / cm 2 , and the green compact is vacuum-sintered in a vacuum of 1 × 10 -2 torr at a temperature of 1380 to 1400 ° C., or a temperature of 1380 to 1400. ℃, pressure: 200 Apply hot pressing under the condition of kg / cm 2 , grind and grind SPP422
Comparison of the present invention WC-based cemented carbide indexable inserts (hereinafter referred to as cemented carbide chips) 1 to 3 having the shape of the above and having substantially the same component composition as the compounding composition, and containing no whisker WC based cemented carbide indexable inserts (hereinafter referred to as comparative cemented carbide tips) 1 to 3 were respectively manufactured.
つぎに、この結果得られた各種の超硬チップについ
て、 被削材:SNCM439（硬さ:HB250）の角材、 切削速度:80m/min、 送り:0.4mm/rev.、 切込み:2mm、 の条件で鋼の高送り乾式断続切削試験を行ない、逃げ面
摩耗幅が0.3mmに至るまでの切削時間を測定すると共
に、切刃状況を観察した。これらの結果を第１表に示し
た。Next, the resulting various carbide inserts, a workpiece: SNCM439 (Hardness: H B 250) square bar of cutting speed: 80 m / min, Feed:. 0.4 mm / rev, cut: 2 mm, The high feed dry intermittent cutting test of steel was carried out under the conditions of No. 1, and the cutting time until the flank wear width reached to 0.3 mm was measured, and the cutting edge condition was observed. The results are shown in Table 1.
第１表に示される結果から、本発明超硬チップ１〜３
は、いずれもホイスカの含有によってすぐれた耐欠損性
を有するようになるので、苛酷な条件下での断続切削で
もすぐれた耐摩耗性を示すのに対して、比較超硬チップ
１〜３は、いずれも耐欠損性不足が原因で、切刃に欠損
が発生し、短かい使用寿命しか示さないことが明らかで
ある。From the results shown in Table 1, the carbide tips 1 to 3 of the present invention
All have excellent fracture resistance due to the inclusion of whiskers, so they show excellent wear resistance even in interrupted cutting under severe conditions, whereas the comparative carbide tips 1-3 are It is clear that in each case, the cutting edge is chipped due to insufficient chipping resistance, and shows only a short service life.
上述のように、この発明のWC基超硬合金製切削工具
は、すぐれた耐欠損性を有するので、断続切削やフライ
ス切削を、高速切削や、高送りおよび高切込みなどの重
切削条件で行なっても切刃に欠損やチッピングの発生が
なく、すぐれた耐摩耗性を示し、著しく長期に亘ってす
ぐれた切削性能を発揮するのである。As described above, the WC-based cemented carbide cutting tool of the present invention has excellent fracture resistance, and therefore intermittent cutting and milling cutting are performed at high cutting speeds and heavy cutting conditions such as high feed and high depth of cut. Even if the cutting edge is not chipped or chipped, it exhibits excellent wear resistance and exhibits excellent cutting performance over a remarkably long period of time.
Claims (1)
１種または２種以上との複合炭化物:0.5〜30重量％、 同じく分散相形成成分として窒化チタン・ホイスカおよ
び／または炭窒化チタン・ホイスカ:5〜40重量％、 を含有し、残りが分散相形成成分としての炭化タングス
テンと不可避不純物からなる組成を有する炭化タングス
テン基超硬合金で構成したことを特徴とする耐欠損性の
すぐれた炭化タングステン基超硬合金製切削工具。1. A composite carbide of Co: 5 to 20% by weight as a binder phase forming component, Ti as a dispersed phase forming component, and one or more of Ta, Nb, and W: 0.5 to 30% by weight. % Titanium carbide whiskers and / or titanium carbonitride whiskers: 5 to 40% by weight as the dispersed phase forming component, and the balance having a composition comprising tungsten carbide as the dispersed phase forming component and unavoidable impurities. A cutting tool made of tungsten carbide based cemented carbide with excellent fracture resistance, characterized by being composed of tungsten based cemented carbide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63223297A JP2668977B2 (en) | 1988-09-06 | 1988-09-06 | Cutting tool made of tungsten carbide based cemented carbide with excellent fracture resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63223297A JP2668977B2 (en) | 1988-09-06 | 1988-09-06 | Cutting tool made of tungsten carbide based cemented carbide with excellent fracture resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0271904A JPH0271904A (en) | 1990-03-12 |
| JP2668977B2 true JP2668977B2 (en) | 1997-10-27 |
Family
ID=16795935
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63223297A Expired - Lifetime JP2668977B2 (en) | 1988-09-06 | 1988-09-06 | Cutting tool made of tungsten carbide based cemented carbide with excellent fracture resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2668977B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100497850B1 (en) * | 2002-12-09 | 2005-06-29 | 대구텍 주식회사 | sinterd alloy of tungsten carbide having tensile strength and wear resistance character & cutting tools using the same |
| JP4848394B2 (en) * | 2008-05-21 | 2011-12-28 | 秋田県 | W-Ti-C composite and method for producing the same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507632A (en) | 1965-11-22 | 1970-04-21 | Karl Swoboda | Composition of matter comprising hard materials |
-
1988
- 1988-09-06 JP JP63223297A patent/JP2668977B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3507632A (en) | 1965-11-22 | 1970-04-21 | Karl Swoboda | Composition of matter comprising hard materials |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0271904A (en) | 1990-03-12 |
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