JPH10176235A - Titaniumcyanide-base cermet for milling cutter - Google Patents
Titaniumcyanide-base cermet for milling cutterInfo
- Publication number
- JPH10176235A JPH10176235A JP35289996A JP35289996A JPH10176235A JP H10176235 A JPH10176235 A JP H10176235A JP 35289996 A JP35289996 A JP 35289996A JP 35289996 A JP35289996 A JP 35289996A JP H10176235 A JPH10176235 A JP H10176235A
- Authority
- JP
- Japan
- Prior art keywords
- regulated
- coercive force
- resistance
- binding phase
- ticn
- 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.)
- Pending
Links
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本願発明は、フライス加工用
の耐欠損性、耐チッピング性に優れたサーメットに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cermet having excellent chipping and chipping resistance for milling.
【０００２】[0002]
【従来の技術】ＴｉＣＮ基サーメットの耐欠損性、耐チ
ッピング性の改良には、様々な提案が行われている。そ
の中でも超硬粒子の如く微細化を計ったのも、強度を高
める成分、例えばＭｏ、Ｗ等の添加量を増やしたものも
ある。フライス分野では、加工能率を高めるため、切削
速度をあげることはもちろん、送り量を高くした切削に
変わりつつある。切削速度、送り量とも高めると切れ刃
先端にかかる負荷は高くなり、強度の他、熱に係わる損
傷に対する性能を向上させる必要がある。また、最近は
機械のＮＣ化が進み無人による加工が増えつつあるた
め、より安定したチップが望まれている。従来の技術と
して組織を微細化する（特開平８―２４０９０号）こと
で優れた靱性を持ったＴｉＣＮ基サーメットや構成する
元素添加量を調整することで靱性を高めたもの等がＴｉ
ＣＮ基サーメット工具としてフライス加工等に用いられ
ている。Various proposals have been made to improve the chipping resistance and chipping resistance of a TiCN-based cermet. Among them, fine particles are measured as in the case of ultra-hard particles, and those in which the amount of a component for increasing strength, for example, Mo, W, etc., is increased. In the milling field, in order to increase machining efficiency, cutting speed has been increased, as well as cutting with increased feed rate. When both the cutting speed and the feed amount are increased, the load applied to the tip of the cutting edge is increased, and it is necessary to improve not only strength but also performance against heat-related damage. In addition, recently, the use of NC machines has increased, and unmanned machining has been increasing. Therefore, more stable chips have been desired. As a conventional technique, a TiCN-based cermet having excellent toughness by refining the structure (Japanese Patent Application Laid-Open No. Hei 8-24090) and an alloy having an improved toughness by adjusting the amount of constituent elements are used.
Used as a CN-based cermet tool for milling and the like.
【０００３】[0003]
【発明が解決しようとする課題】本願発明では、耐欠損
性と熱的損傷の双方の観点より性能向上を検討し、ある
程度の高速切削速度の域での性能向上が図れるよう、靭
性、高温特性、耐欠損性等を改善したサーメットを提供
するものである。本発明の目的は、従来に比べ耐欠損性
を向上させることで切削寿命の優れたＴｉＣＮ基サーメ
ット合金を提供することである。SUMMARY OF THE INVENTION In the present invention, the performance improvement is examined from the viewpoints of both the fracture resistance and the thermal damage, and the toughness and the high-temperature characteristics are improved so that the performance can be improved at a certain high-speed cutting speed. And a cermet having improved fracture resistance and the like. An object of the present invention is to provide a TiCN-based cermet alloy having improved cutting resistance as compared with conventional ones and having an excellent cutting life.
【０００４】[0004]
【課題を解決するための手段】具体的には、硬質相、結
合相双方の影響する物理的性質において、飽和磁束密度
（以下、４πσと略称する。）、保磁力（以下、Ｈｃと
略称する。）、硬さ、クラック長、をスケールとして、
その特性と切削性能を勘案し、それら物理的性質を改善
することにより、切削性能を高め、用途に適したサーメ
ットとした。すなわち、材料特性のうち４πσを４（μ
Ｔｍ3／ｋｇ）〜２２とし、かつ、Ｈｃ（Ｏｅ）を１０
０〜２００とすることにより、更には、硬さがＨＲＡで
９１．０〜９１．７、かつ、クラック長が１８０μｍ以
下にすることにより靭性に優れたフライス用ＴｉＣＮ基
サーメットとしたものである。Specifically, in the physical properties affected by both the hard phase and the binder phase, the saturation magnetic flux density (hereinafter abbreviated as 4πσ) and the coercive force (hereinafter abbreviated as Hc). )), Hardness, crack length, as a scale,
Taking into account its characteristics and cutting performance, by improving their physical properties, the cutting performance was enhanced and a cermet suitable for the application was obtained. That is, 4πσ of the material properties is set to 4 (μ
Tm 3 / kg) to 22 and Hc (Oe) is 10
By setting the hardness to 0 to 200, the hardness is 91.0 to 91.7 in terms of HRA, and the crack length is set to 180 μm or less to obtain a TiCN-based cermet for milling excellent in toughness.
【０００５】上記４πσやＨｃは硬質相、結合相の状態
により数値が変化する。また、硬さはチップの寿命（耐
摩耗性）やクラック長はチップの靱性（耐欠損性）に大
きく影響する。まず、４πσは、結合相中の磁化の強さ
を現し、この値は、間接的に結合相中の炭素量を表す。
Ｈｃは、結合相の厚みを表し、間接的に硬質粒子の粒度
が把握できる。両特性とも品質管理上簡便に用いられて
いる特性値である。よって、４πσを４以上としたの
は、結合相中の炭素量が高炭素域であることを示し、２
２以下は、結合相含有量が少ない、多い場合があるので
フリーカーボン相が生じない程度を表すため、便宜的に
用いたものである。また、Ｈｃを１００以上２００以下
としたのは、１００未満では結合相の厚みが厚くなりす
ぎ、言い換えれば粒子が粗いため所望の特性が得られ
ず、また２００を越えると結合相の厚みが薄くなりす
ぎ、言い換えれば粒子が細かくなりすぎるため、１００
以上２００以下とした。この両特性を範囲内とすること
で、チップの耐欠損性と耐摩耗性を改善することが出来
た。The numerical values of 4πσ and Hc change depending on the state of the hard phase and the binder phase. The hardness greatly affects the life of the chip (abrasion resistance) and the crack length greatly affects the toughness (breakage resistance) of the chip. First, 4πσ indicates the intensity of magnetization in the binder phase, and this value indirectly represents the amount of carbon in the binder phase.
Hc represents the thickness of the binder phase, and the particle size of the hard particles can be indirectly grasped. Both characteristics are characteristic values that are easily used for quality control. Therefore, setting 4πσ to 4 or more indicates that the carbon content in the binder phase is in a high carbon region, and 2
A value of 2 or less is used for convenience because it indicates the extent to which a free carbon phase does not occur because the binder phase content may be small or large. Further, the reason why Hc is set to 100 or more and 200 or less is that if it is less than 100, the thickness of the binder phase becomes too thick, in other words, the desired characteristics cannot be obtained because the particles are coarse, and if it exceeds 200, the thickness of the binder phase becomes thin. Because the particles are too fine, in other words
It was 200 or less. By keeping both these characteristics within the ranges, the chipping resistance and wear resistance of the chip could be improved.
【０００６】次に、硬さは耐摩耗性を表すものであり、
前記Ｈｃと相関する物性であり、ＨＲＡ９１．７を超え
ると、耐摩耗性は向上するが、その反面、靭性が低下
し、耐欠損性を低めてしまい、ＨＲＡ９１．０未満で
は、耐摩耗性が不足してしまうため、硬さをＨＲＡ９
１．０〜９１．７の範囲とした。また、クラック長を１
８０μｍ以下としたのは、クラック長はビッカース硬さ
計で５０ｋｇ荷重を掛けた時の圧痕各コーナーに生ずる
４本のクラック長さを平均した値である。このクラック
長さは、クラックを伝播させたときの経路によりその長
さが変化する。例えば、上記特性値を満足する場合は、
クラックの伝播はその粒子と結合相の界面に沿って進
み、結合相の強度が高いため、あまり長くはならない。
しかし、上記特性の範囲外となると、例えばＨｃが高い
場合には、クラックの伝播はその粒子と結合相の界面に
沿って進み、結合相の厚さが薄いため伝播しやすく、長
くなる傾向が現れる。また、４πσが４未満では、結合
相自体の強度が下がるため同様な傾向になる。また、ク
ラック長が短くクラックを伝播しにくいことは、結合相
自体の機械的強度が改善され、実施例でのテストでクラ
ック長の短い本発明合金はヒートクラックも短いことか
ら、クラック長がチップの耐欠損性およびヒートクラッ
クに対する強さを表す尺度とすることができる。Next, hardness indicates abrasion resistance.
It is a physical property that correlates with the above Hc. When HRA exceeds 91.7, wear resistance is improved, but on the other hand, toughness is reduced and fracture resistance is reduced. Because of shortage, the hardness is HRA9
The range was 1.0 to 91.7. The crack length is 1
The reason why the crack length is 80 μm or less is that the crack length is a value obtained by averaging the lengths of four cracks generated at each corner of the indentation when a 50 kg load is applied by a Vickers hardness tester. The length of the crack varies depending on the path through which the crack propagated. For example, if the above characteristic values are satisfied,
Crack propagation proceeds along the interface between the particle and the binder phase and is not too long due to the high strength of the binder phase.
However, when the properties are out of the above range, for example, when Hc is high, the crack propagates along the interface between the particle and the binder phase, and because the thickness of the binder phase is thin, the crack easily propagates and tends to become longer. appear. When 4πσ is less than 4, the same tendency tends to occur because the strength of the binder phase itself decreases. In addition, the fact that the crack length is short and the crack is not easily propagated means that the mechanical strength of the binder phase itself is improved, and the alloy of the present invention having a short crack length in the test in the Examples has a short heat crack, so that the crack length is small. Can be used as a measure of the fracture resistance and heat cracking resistance of the steel.
【０００７】[0007]
【実施例】以下、実際例により本発明を詳細に説明す
る。本願発明においては、ＪＩＳ Ｍ２０相当組成のＴ
ｉＣＮ基サーメットを用いた。本願のような特性とする
ため、焼結における温度、雰囲気をパラメーターとして
様々試験を行った。その結果、同種の組成物において
も、その雰囲気調整、焼結時の温度等により物性を制御
した。その結果を表１に示す。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to practical examples. In the present invention, T of the composition equivalent to JIS M20 is used.
An iCN-based cermet was used. Various tests were conducted using the temperature and atmosphere in sintering as parameters to obtain the characteristics as in the present application. As a result, even for the same type of composition, the physical properties were controlled by adjusting the atmosphere, temperature during sintering, and the like. Table 1 shows the results.
【０００８】[0008]
【表１】 [Table 1]
【０００９】表１より、本発明例１〜８は４πσ、Ｈｃ
とも値が大きく、十分な炭素量、結合相の厚みが得られ
ているのに対し、従来例では、４πσ、Ｈｃとも値が小
さくなっているが、これは結合相の炭素量が低く、結合
相の厚みが厚すぎることを示している。次に、切削試験
は本発明例１、２及び従来例１１、１２を用いて行っ
た。ネガポジタイプの１６０ｍｍφの正面フライスを用
いて、チップ形状ＳＥＥ４２ＴＮ―特殊形状で行った。
切削諸元は、切削速度１５０ｍ／ｍｉｎ、切り込み２．
０ｍｍ、一定時間に送り量を上げて欠損する送りの値で
評価した。被削材はＳＫＤ１１（未調質材）、サイズ１
２５×１２５×２５０ｍｍブロックの中心に５０ｍｍの
溝を設け、耐欠損性を評価した。その結果を図１に示
す。From Table 1, it can be seen that Examples 1 to 8 of the present invention have 4πσ, Hc
In both cases, the values of 4πσ and Hc are small, whereas the values of 4πσ and Hc are small in the conventional example. This indicates that the thickness of the phase is too thick. Next, a cutting test was performed using Examples 1 and 2 of the present invention and Conventional Examples 11 and 12. The chip shape was SEE42TN-special shape using a negative / positive type 160 mmφ face milling machine.
Cutting specifications were as follows: cutting speed 150 m / min, cutting depth 2.
The feeding amount was increased at a fixed time of 0 mm, and the value of the feeding was evaluated. Work material is SKD11 (non-tempered material), size 1
A 50 mm groove was provided at the center of a 25 × 125 × 250 mm block, and the fracture resistance was evaluated. The result is shown in FIG.
【００１０】図１より、本発明例１、２は、送り量０．
４７ｍｍ／刃、０．６ｍｍ／刃で欠損したが、従来例１
１、１２は０．３０ｍｍ／刃でいずれも欠損している。As shown in FIG. 1, in Examples 1 and 2 of the present invention, the feed amount is 0.
47 mm / blade, 0.6 mm / blade
Nos. 1 and 12 are missing at 0.30 mm / blade.
【００１１】続いて、耐摩耗性を評価するため、切削速
度１５０ｍ／ｍｉｎ、送り０．１５ｍｍ／刃，切り込み
１．０ｍｍの条件で評価を行った。被削材はＳＫＤ１１
（未調質材）、１２５×１２５×２５０ｍｍブロックを
用いた。その結果を図２に示す。図２は、切削長（ｍ）
を横軸に、逃げ面最大摩耗量を縦軸にとり、単位切削長
さごとに摩耗を測定した結果を図示したもので、本発明
例１は３ｍの切削長さで摩耗量は０．１６ｍｍで、欠損
もなく正常な摩耗を示した。本発明例２は３ｍの切削長
さで摩耗量０．１９ｍｍで、同様に欠損もなく正常な摩
耗を示した。従来品１１は、摩耗量０．３ｍｍで、切り
刃に微細なチッピングが多数観察された。従来品１２は
摩耗量が０．３９ｍｍと大きく、大きなチッピングが観
察された。Subsequently, in order to evaluate the wear resistance, the evaluation was performed under the conditions of a cutting speed of 150 m / min, a feed of 0.15 mm / tooth, and a cut of 1.0 mm. Work material is SKD11
A (non-tempered material), 125 × 125 × 250 mm block was used. The result is shown in FIG. Figure 2 shows the cutting length (m)
Is plotted on the abscissa and the maximum flank wear is plotted on the ordinate, and the results of measuring the wear for each unit cutting length are shown. Inventive Example 1 has a cutting length of 3 m and a wear amount of 0.16 mm. And showed normal wear without any defects. Inventive Example 2 had a wear length of 0.19 mm at a cutting length of 3 m, and similarly showed normal wear without any chipping. In the conventional product 11, the wear amount was 0.3 mm, and many fine chippings were observed on the cutting blade. The conventional product 12 had a large wear amount of 0.39 mm, and large chipping was observed.
【００１２】次に、耐ヒートクラック性を評価するた
め、切削速度１５０ｍ／ｍｉｎ、送り量０．１５ｍｍ／
刃，切り込み５．０ｍｍの条件で評価を行った。被削材
はＳＫＤ１１（未調質材）でその幅を４０ｍｍと薄くす
ることにより、切り刃の接触を短く、空転を長くするこ
とにより、切削による加熱を短時間に、空転時の冷却を
長時間として、加熱冷却を繰り返すことにより、ヒート
クラックをより生じやすい諸元として、単位切削長さ毎
にその状況を観察した。その結果を図３に示す。図３の
縦軸のヒートクラック長さは、切削にて生じたヒートク
ラックの平均長さで示した。ヒートクラック長さが本発
明例１、２はそれぞれ０．０８ｍｍ、０．０７ｍｍであ
るが、従来例１１は０．１９ｍｍ、従来例１２は０．１
２ｍｍでいずれもヒートクラックが長くなっていた。Next, in order to evaluate the heat crack resistance, a cutting speed of 150 m / min and a feed rate of 0.15 mm /
The evaluation was performed under the conditions of a blade and a notch of 5.0 mm. The work material is made of SKD11 (non-tempered material), the width of which is as thin as 40 mm, to shorten the contact of the cutting blade, and to lengthen the idling, thereby shortening the heating by cutting and increasing the cooling during idling. By repeating heating and cooling as a time, the condition was observed for each unit cutting length as a parameter that easily causes a heat crack. The result is shown in FIG. The heat crack length on the vertical axis in FIG. 3 is represented by the average length of the heat crack generated by cutting. The heat crack lengths of Examples 1 and 2 of the present invention were 0.08 mm and 0.07 mm, respectively, while Conventional Example 11 was 0.19 mm and Conventional Example 12 was 0.19 mm.
At 2 mm, the heat cracks were all long.
【００１３】[0013]
【発明の効果】本発明により耐摩耗性を損なわずに耐欠
損性を大幅に向上させることができ、また、フライス加
工等に対し耐ヒートクラックに優れたＴｉＣＮ基サーメ
ットとすることができた。According to the present invention, the fracture resistance can be greatly improved without deteriorating the wear resistance, and a TiCN-based cermet having excellent heat crack resistance against milling or the like can be obtained.
【図１】図１は、耐欠損性試験の結果を示す。FIG. 1 shows the results of a fracture resistance test.
【図２】図２は、耐摩耗性試験の結果を示す。FIG. 2 shows the results of a wear resistance test.
【図３】図３は、耐ヒートクラック試験の結果を示す。FIG. 3 shows the results of a heat crack resistance test.
Claims (2)
いて、飽和磁束密度を４〜２２μＴｍ3／ｋｇとし、か
つ、保磁力を１００〜２００としたことを特徴とする靱
性に優れたフライス用ＴｉＣＮ基サーメット。1. A cermet alloy based on TiCN, wherein the saturation magnetic flux density is 4 to 22 μTm 3 / kg, and the coercive force is 100 to 200. .
おいて、硬さがＨＲＡで９１．０〜９１．７であり、か
つ、クラック長が１８０μｍ以下であることを特徴とす
る靭性に優れたフライス用ＴｉＣＮ基サーメット。2. The milling machine according to claim 1, wherein the hardness of the cermet is 91.0 to 91.7 in terms of HRA and the crack length is 180 μm or less. TiCN-based cermet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35289996A JPH10176235A (en) | 1996-12-13 | 1996-12-13 | Titaniumcyanide-base cermet for milling cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35289996A JPH10176235A (en) | 1996-12-13 | 1996-12-13 | Titaniumcyanide-base cermet for milling cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10176235A true JPH10176235A (en) | 1998-06-30 |
Family
ID=18427219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35289996A Pending JPH10176235A (en) | 1996-12-13 | 1996-12-13 | Titaniumcyanide-base cermet for milling cutter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10176235A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008000885A (en) * | 2006-06-15 | 2008-01-10 | Sandvik Intellectual Property Ab | Coated milling insert |
| JP2017035750A (en) * | 2015-08-10 | 2017-02-16 | 三菱マテリアル株式会社 | Ti-BASED CERMET CUTTING TOOL EXCELLENT IN ANTI-PLASTIC DEFORMATION, ABNORMAL DAMAGE RESISTANCE AND WEAR RESISTANCE |
-
1996
- 1996-12-13 JP JP35289996A patent/JPH10176235A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008000885A (en) * | 2006-06-15 | 2008-01-10 | Sandvik Intellectual Property Ab | Coated milling insert |
| JP2017035750A (en) * | 2015-08-10 | 2017-02-16 | 三菱マテリアル株式会社 | Ti-BASED CERMET CUTTING TOOL EXCELLENT IN ANTI-PLASTIC DEFORMATION, ABNORMAL DAMAGE RESISTANCE AND WEAR RESISTANCE |
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