JP2757580B2 - Surface coated cutting tool and method of manufacturing the same - Google Patents
Surface coated cutting tool and method of manufacturing the sameInfo
- Publication number
- JP2757580B2 JP2757580B2 JP8973291A JP8973291A JP2757580B2 JP 2757580 B2 JP2757580 B2 JP 2757580B2 JP 8973291 A JP8973291 A JP 8973291A JP 8973291 A JP8973291 A JP 8973291A JP 2757580 B2 JP2757580 B2 JP 2757580B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- coated cutting
- cutting tool
- coated
- 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.)
- Expired - Lifetime
Links
Landscapes
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Powder Metallurgy (AREA)
- Chemical Vapour Deposition (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、ＷＣ基超硬合金、Ｔ
ｉＣＮ基サーメット、Ｓｉ3 Ｎ4 基セラミックス、Ａｌ
2 Ｏ3 基セラミックスのいずれか１種を基体とし、その
表面に硬質層を被覆した表面被覆切削工具に関するもの
であり、特に断続切削で使用した場合に優れた耐欠損性
を示すものである。The present invention relates to a WC-based cemented carbide,
iCN-based cermet, Si 3 N 4 -based ceramics, Al
The present invention relates to a surface-coated cutting tool in which any one of 2 O 3 -based ceramics is used as a substrate and the surface thereof is coated with a hard layer, and exhibits excellent fracture resistance particularly when used in interrupted cutting.
【０００２】[0002]
【従来の技術】ＷＣ基超硬合金、ＴｉＣＮ基サーメッ
ト、Ｓｉ3 Ｎ4 基セラミックス、Ａｌ2 Ｏ3 基セラミッ
クスのいずれか１種を基体とし、その表面に周期律表の
４ａ，５ａおよび６ａ族金属、Ａｌ，Ｓｉの群から選ん
だ１種または２種以上の金属元素と炭素、窒素、酸素お
よびほう素からなる群より選んだ１種または２種以上の
非金属元素の化合物の１種の単層または２種以上の多重
層で構成された硬質層を被覆した表面被覆切削工具は、
広く一般に使用されている。2. Description of the Related Art A base material is selected from the group consisting of WC-based cemented carbide, TiCN-based cermet, Si 3 N 4 -based ceramics, and Al 2 O 3 -based ceramics. One or more compounds of one or more metal elements selected from the group consisting of metals, Al and Si and one or more nonmetal elements selected from the group consisting of carbon, nitrogen, oxygen and boron A surface-coated cutting tool coated with a hard layer composed of a single layer or two or more layers,
Widely used in general.
【０００３】なかでも、炭窒化チタン層は、高い耐摩耗
性を有するところから、広く使用されており、この炭窒
化チタン層は、例えば、特公昭５１−２４９８２号公報
では四塩化チタンと水素と窒素とメタンの混合ガスを８
００〜１１５０℃の温度領域に加熱された炉中で化学反
応させることにより形成されることが示されており、ま
た、より低温で被覆する方法として特公昭５７−５３３
０８号公報には、四塩化チタンと水素と有機炭窒化合物
の混合ガスを使用することにより７６０〜９５０℃の温
度領域で熱化学反応による炭窒化チタン層がＷＣ基超硬
合金基体表面に形成できることが示されている。[0003] Above all, titanium carbonitride layers are widely used because of their high wear resistance. For example, this titanium carbonitride layer is disclosed in Japanese Patent Publication No. Sho 51-249982 as titanium tetrachloride and hydrogen. 8 mixed gas of nitrogen and methane
It has been shown to be formed by a chemical reaction in a furnace heated to a temperature range of 00 to 1150 ° C., and a method of coating at a lower temperature is disclosed in JP-B-57-533.
No. 08-208, a titanium carbonitride layer is formed on the surface of a WC-based cemented carbide substrate by a thermochemical reaction in a temperature range of 760 to 950 ° C. by using a mixed gas of titanium tetrachloride, hydrogen and an organic carbonitride compound. It shows that you can do it.
【０００４】[0004]
【発明が解決しようとする課題】上記炭窒化チタン層を
少くとも１層含む単層または多重層で構成された硬質層
を被覆した表面被覆切削工具は、高い耐摩耗性を示すも
のの、断続切削などの重切削では欠けやすく、耐欠損性
が十分でないという課題があった。A surface-coated cutting tool coated with a hard layer composed of a single layer or multiple layers containing at least one titanium carbonitride layer as described above has high wear resistance, but is intermittently cut. In such heavy cutting, there is a problem that chipping is easy and chipping resistance is not sufficient.
【０００５】[0005]
【課題を解決するための手段】そこで、本発明者は、か
かる課題を解決すべく研究を行った結果、通常の化学蒸
着法で被覆した炭窒化チタン層には、基体との熱膨張係
数との差により、高い引張り残留応力が生じていること
がわかり、炭窒化チタン層の引張り残留応力を２０kgｆ
／mm2 以下に緩和することにより耐欠損性が向上すると
いう知見を得たのである。The inventors of the present invention have conducted studies to solve the above-mentioned problems, and as a result, the titanium carbonitride layer coated by a normal chemical vapor deposition method has a thermal expansion coefficient with a substrate. It can be seen from the difference in that a high tensile residual stress was generated, and the tensile residual stress of the titanium carbonitride layer was reduced to 20 kgf.
/ Mm 2 or less was found to improve fracture resistance.
【０００６】この発明は、かかる知見にもとづいてなさ
れたものであって、引張り残留応力が２０kgｆ／mm2 以
下の炭窒化チタン層を少くとも１層含む単層または２種
以上の多重層を被覆してなる表面被覆切削工具およびそ
の製造方法に特徴を有するものである。The present invention has been made on the basis of this finding, and covers a single layer containing at least one titanium carbonitride layer having a tensile residual stress of 20 kgf / mm 2 or less or a multilayer of two or more kinds. And a method for manufacturing the same.
【０００７】上記引張り残留応力が２０kgｆ／mm2 以下
の炭窒化チタン層を形成するためには、少くとも四塩化
チタンと水素と有機炭窒化合物の混合ガスにより、７０
０〜９５０℃の温度域で化学蒸着したのち、平均冷却速
度：１５℃／分以下で５００℃まで冷却する。In order to form a titanium carbonitride layer having a residual tensile stress of not more than 20 kgf / mm 2 , a mixed gas of at least titanium tetrachloride, hydrogen and an organic carbonitride compound is used.
After chemical vapor deposition in a temperature range of 0 to 950 ° C, the sample is cooled to 500 ° C at an average cooling rate of 15 ° C / minute or less.
【０００８】[0008]
【実施例】この発明を実施例にもとづいてさらに具体的
に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically based on embodiments.
【０００９】いずれもＩＳＯ規格ＴＮＧＮ１６０４０８
の形状を有するＷＣ基超硬合金、ＴｉＣＮ基サーメッ
ト、Ｓｉ3 Ｎ4 基セラミックスおよびＡｌ2 Ｏ3 基セラ
ミックスを用意し、上記ＷＣ基超硬合金に付いてはＩＳ
Ｏ規格Ｋ１０，Ｋ３０，Ｍ２０およびＰ２０に相当する
成分組成の異なった４種類のＷＣ基超硬合金を用意し
た。[0009] All are ISO standard TNGN160408
WC-based cemented carbide, TiCN-based cermet, Si 3 N 4 -based ceramics and Al 2 O 3 -based ceramics having the following shapes are prepared.
Four kinds of WC-based cemented carbides having different component compositions corresponding to O standards K10, K30, M20 and P20 were prepared.
【００１０】上記ＷＣ基超硬合金、ＴｉＣＮ基サーメッ
ト、Ｓｉ3 Ｎ4 基セラミックスおよびＡｌ2 Ｏ3 基セラ
ミックスをそれぞれ基体とし、その表面に表１に示され
るＴｉＣＮ層被覆条件でＴｉＣＮ層を少くとも１層化学
蒸着し、上記ＴｉＣＮ層以外のＴｉＣ層、ＴｉＣＮＯ
層、ＴｉＮ層、Ａｌ2 Ｏ3 層は通常の条件で化学蒸着す
ることにより表２に示される被覆層構造の本発明表面被
覆切削工具１〜７さらに、すべて通常の条件で化学蒸着
することにより表３に示される被覆構造の従来表面被覆
切削工具１〜８を作製した。The above-mentioned WC-based cemented carbide, TiCN-based cermet, Si 3 N 4 -based ceramics and Al 2 O 3 -based ceramics are used as substrates, and at least a TiCN layer is coated on the surface thereof under the conditions shown in Table 1 below. One layer chemical vapor deposition, TiC layer other than the above TiCN layer, TiCNO
The layer, TiN layer, and Al 2 O 3 layer are chemically vapor-deposited under normal conditions, and the surface-coated cutting tools 1 to 7 of the present invention having the coating layer structure shown in Table 2 are further subjected to chemical vapor deposition under normal conditions. Conventional surface-coated cutting tools 1 to 8 having a coating structure shown in Table 3 were produced.
【００１１】[0011]
【表１】 [Table 1]
【００１２】[0012]
【表２】 [Table 2]
【００１３】[0013]
【表３】 [Table 3]
【００１４】上記本発明表面被覆切削工具１〜７および
従来表面被覆切削工具１〜８の被覆層のＴｉＣＮ層の引
張り残留応力をＸ線回折による２θ− sin2 ψ法を用い
て測定し、それらの測定結果を表４に示すとともに、上
記本発明表面被覆切削工具１〜７および従来表面被覆切
削工具１〜８のそれぞれ１０切れ刃を用いて下記の条件
の断続切削テストを行い、１０切れ刃の欠損が生じるま
での衝撃回数を求めてその平均値を表４に示した。[0014] The tensile residual stress of the TiCN layer of the coating layer of the surface-coated cutting tools 1 to 7 of the present invention and the conventional surface-coated cutting tools 1 to 8 is measured by the 2θ-sin 2 ψ method by X-ray diffraction. Table 4 shows the measurement results, and the above-described surface-coated cutting tools 1 to 7 of the present invention and the conventional surface-coated cutting tools 1 to 8 were each subjected to an intermittent cutting test under the following conditions using 10 cutting edges. Table 4 shows the average value of the number of impacts before the occurrence of the defect.
【００１５】断続切削テスト条件 被削材：ＳＮＣＭ４３９（ＨB ３２０）の角材、 切削速度：１２０ｍ／分、 送り：０．５mm／rev 、 切込み：４mm[0015] Intermittent cutting test conditions Workpiece: square timber of SNCM439 (H B 320), Cutting speed: 120 m / min, Feed: 0.5 mm / rev, cut: 4 mm
【００１６】[0016]
【表４】 [Table 4]
【００１７】[0017]
【発明の効果】表２および表３に示されるように、本発
明表面被覆切削工具１と従来表面被覆切削工具１とは、
基体の種類並びにＴｉＣＮ層を含む被覆層の成分組成お
よび厚さが同じであるが、表１に示されるようにＴｉＣ
Ｎ層形成のためのガスの混合成分を変え同時に５００℃
までの平均冷却速度を低く抑えて形成された引張り残留
応力：２０kgｆ／mm2 以下のＴｉＣＮ層を少くとも１層
被覆した本発明表面被覆切削工具１は、上記引張り残留
応力が２０kgｆ／mm2 を越えるＴｉＣＮ層を含む硬質層
を被覆した従来表面被覆切削工具１に比べて耐欠損性が
優れていることは表４に示された結果から明らかであ
る。As shown in Tables 2 and 3, the surface-coated cutting tool 1 of the present invention and the conventional surface-coated cutting tool 1
The type of substrate and the composition and thickness of the coating layer including the TiCN layer were the same, but as shown in Table 1,
500 ° C. at the same time by changing the mixed components of the gas for forming the N layer
Tensile residual stress formed by suppressing the average cooling rate up to a low level: The surface-coated cutting tool 1 of the present invention coated with at least one TiCN layer having a tensile residual stress of 20 kgf / mm 2 or less has a tensile residual stress of 20 kgf / mm 2 . It is apparent from the results shown in Table 4 that the chipping resistance is superior to that of the conventional surface-coated cutting tool 1 coated with a hard layer including a TiCN layer that exceeds the hardness.
【００１８】以上、本発明表面被覆切削工具１と従来表
面被覆切削工具とを比較したが、本発明表面被覆切削工
具２〜７と従来表面被覆切削工具２〜６をそれぞれ比較
しても同じ傾向を示すことは表４の結果から明らかであ
る。As described above, the surface-coated cutting tool 1 of the present invention is compared with the conventional surface-coated cutting tool. However, the same tendency is observed when the surface-coated cutting tools 2 to 7 of the present invention are compared with the conventional surface-coated cutting tools 2 to 6, respectively. Is apparent from the results in Table 4.
【００１９】さらに、ＴｉＣＮ層被覆の際の温度および
ガスの混合成分が同じであっても、５００℃までの平均
冷却速度の速い従来表面被覆切削工具７，８を平均冷却
速度の遅い本発明表面被覆切削工具３，５とそれぞれ比
較すると、従来表面被覆切削工具７，８のＴｉＣＮ層
は、やはりその引張り残留応力が２０kgｆ／mm2 を越え
ており、その切削性能も有機炭窒化合物を使用しないも
のよりは良いものの、本発明表面被覆切削工具３，５よ
りは著しく劣る結果となっている。Furthermore, even if the temperature and the mixture of gases in coating the TiCN layer are the same, the conventional surface-coated cutting tools 7, 8 with a high average cooling rate up to 500 ° C. Compared with the coated cutting tools 3 and 5, respectively, the TiCN layers of the conventional surface coated cutting tools 7 and 8 also have a residual tensile stress exceeding 20 kgf / mm 2 , and their cutting performance does not use organic carbonitride compounds. Although it is better than the cutting tool, the result is remarkably inferior to the surface-coated cutting tools 3 and 5 of the present invention.
【００２０】上述のように、この発明は、ＴｉＣＮ層を
化学蒸着するための条件および冷却条件を変えるだけで
簡単に耐欠損性の優れた表面被覆切削工具を提供するこ
とができ、産業上すぐれた効果を奏するものである。As described above, the present invention can easily provide a surface-coated cutting tool having excellent fracture resistance simply by changing the conditions for chemical vapor deposition of a TiCN layer and the cooling conditions. It has the effect that it has.
Claims (2)
ト、Ｓｉ3 Ｎ4 基セラミックスおよびＡｌ2 Ｏ3 基セラ
ミックスのいずれか１種を基体とし、その表面に周期律
表の４ａ，５ａ，および６ａ族金属、Ａｌ，Ｓｉの群か
ら選んだ１種または２種以上の金属元素と炭素、窒素、
酸素およびほう素からなる群より選んだ１種または２種
以上の非金属元素の化合物の１種の単層または２種以上
の多重層で構成された硬質層を被覆してなる表面被覆切
削工具において、上記１種の単層または２種以上の多重
層は、２０kgｆ／mm2 以下の引張り残留応力を有する炭
窒化チタンを少くとも１層含むことを特徴とする表面被
覆切削工具。1. A substrate comprising one of a WC-based cemented carbide, a TiCN-based cermet, a Si 3 N 4 -based ceramic, and an Al 2 O 3 -based ceramic, and having a surface of 4a, 5a, and 6a of the periodic table on its surface. One or more metal elements selected from the group consisting of group metals, Al and Si, and carbon, nitrogen,
Surface-coated cutting tool coated with a hard layer composed of one single layer or two or more layers of one or more compounds of non-metal elements selected from the group consisting of oxygen and boron 2. The surface-coated cutting tool according to claim 1, wherein the one or more single layers include at least one layer of titanium carbonitride having a residual tensile stress of 20 kgf / mm 2 or less.
ト、Ｓｉ3 Ｎ4 基セラミックスおよびＡｌ2 Ｏ3 基セラ
ミックスのいずれか１種を基体とし、その表面に、四塩
化チタンと水素と有機炭窒化合物を必須成分とする混合
ガスにより７００〜９５０℃の温度域で少くとも１層の
炭窒化チタン層を被覆して上記炭窒化チタン層を少くと
も１層を含む硬質層を形成し、ついで、この硬質層を平
均冷却速度：１５℃／分以下の冷却速度で５００℃まで
冷却することを特徴とする請求項１記載の表面被覆切削
工具の製造方法。2. A substrate comprising any one of WC-based cemented carbide, TiCN-based cermet, Si 3 N 4 -based ceramics and Al 2 O 3 -based ceramics, and having titanium tetrachloride, hydrogen, and organic carbonitride on its surface. At least one titanium carbonitride layer is coated at a temperature range of 700 to 950 ° C. with a mixed gas containing a compound as an essential component to form a hard layer containing at least one titanium carbonitride layer. The method for producing a surface-coated cutting tool according to claim 1, wherein the hard layer is cooled to 500 ° C at a cooling rate of 15 ° C / min or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8973291A JP2757580B2 (en) | 1991-03-28 | 1991-03-28 | Surface coated cutting tool and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8973291A JP2757580B2 (en) | 1991-03-28 | 1991-03-28 | Surface coated cutting tool and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04300103A JPH04300103A (en) | 1992-10-23 |
| JP2757580B2 true JP2757580B2 (en) | 1998-05-25 |
Family
ID=13978939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8973291A Expired - Lifetime JP2757580B2 (en) | 1991-03-28 | 1991-03-28 | Surface coated cutting tool and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2757580B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2948803B1 (en) | 1998-03-31 | 1999-09-13 | 日本特殊陶業株式会社 | Cermet tool and its manufacturing method |
| JP5152660B2 (en) * | 2008-08-21 | 2013-02-27 | 住友電工ハードメタル株式会社 | Cutting tool and manufacturing method thereof |
-
1991
- 1991-03-28 JP JP8973291A patent/JP2757580B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04300103A (en) | 1992-10-23 |
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