JPH0791604B2 - Sintering method of TiCN-based cermet - Google Patents
Sintering method of TiCN-based cermetInfo
- Publication number
- JPH0791604B2 JPH0791604B2 JP61200519A JP20051986A JPH0791604B2 JP H0791604 B2 JPH0791604 B2 JP H0791604B2 JP 61200519 A JP61200519 A JP 61200519A JP 20051986 A JP20051986 A JP 20051986A JP H0791604 B2 JPH0791604 B2 JP H0791604B2
- Authority
- JP
- Japan
- Prior art keywords
- sintering
- cermet
- ticn
- cooling
- gas
- 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
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】 ＜産業上の利用分野＞ この発明は靱性、信頼性にすぐれたサーメット切削工具
用のTiCN基サーメットの焼結法に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a sintering method of a TiCN-based cermet for a cermet cutting tool having excellent toughness and reliability.
＜従来の技術＞ チタンとタンタル、ニオブ、モリブデン、タングステン
などの複炭窒化物を鉄、ニッケル、コバルト、クロム、
モリブデン、タングステンからなる群より選んだ１種以
上の金属で結合した硬質合金を焼結したいわゆるサーメ
ットよりなる切削工具は超硬合金製切削工具に比べて鉄
との溶着性にすぐれていることから、仕上り切削、さら
にはフライス加工などに広く実用化されている。<Prior art> Double carbonitrides such as titanium and tantalum, niobium, molybdenum, and tungsten are mixed with iron, nickel, cobalt, chromium,
Since a cutting tool made of so-called cermet, which is made by sintering a hard alloy that is bonded with one or more metals selected from the group consisting of molybdenum and tungsten, has better weldability to iron than a cutting tool made of cemented carbide. It is widely used for finishing cutting, milling, etc.
特に型押し、焼結しただけで研削加工をしない焼結肌チ
ップは、従来の焼結後ダイヤモンド砥石にて研削加工し
た研削肌チップに比べ、精度上は何ら遜色がないことに
加え、安価であることから最近特にその使用量が増大し
つつある。In particular, the sintered skin chips that are only stamped and sintered but not ground are comparable to conventional ground skin chips that have been ground with a diamond grindstone after sintering, and at a low cost. Therefore, the amount of its use has been increasing especially recently.
サーメットの焼結方法としては、従来から種々の技術が
提案されており、特に焼結中に脱窒現象が生じないよ
う、窒素雰囲気中で焼結するということは、当業者にお
いて周知の技術である。As a cermet sintering method, various techniques have been conventionally proposed, and it is known in the art that sintering is performed in a nitrogen atmosphere so that a denitrification phenomenon does not occur during sintering. is there.
＜発明が解決しようとする問題点＞ 従来の窒素雰囲気下での焼結法をサーメットに実施する
と、たしかに脱窒現象は防止できるものの、焼結後得ら
れたサーメットの表面部が内部に比べてビッカース硬度
で100〜400程度硬化するという現象が生じる。<Problems to be solved by the invention> When the cermet is subjected to the conventional sintering method under a nitrogen atmosphere, the denitrification phenomenon can be prevented, but the surface portion of the cermet obtained after the sintering is compared with the inside. A phenomenon occurs that the Vickers hardness is about 100 to 400.
サーメットにおいて、硬さと靱性とは相反するため、表
面部が硬いと靱性が低下する。In cermet, hardness and toughness are contradictory, so if the surface portion is hard, toughness decreases.
特にサーメットのように仕上げ加工でよく使用される工
具では、使用時の切込みが0.5mm以下と通常の２〜5mmの
切込みに比べて著しく小さいため、殆んど表面の硬化部
のみで切削していることになり、確かに耐摩耗性はすぐ
れるものの、靱性に欠けるため使用中欠損に至ることが
多々あり、サーメット工具の信頼性を損ねていた。Especially with tools often used for finishing such as cermet, the depth of cut when used is 0.5 mm or less, which is significantly smaller than the normal depth of cut of 2 to 5 mm, so most of the cutting is done only at the hardened part of the surface. Therefore, although the wear resistance is excellent, the toughness of the cermet tool is often lost due to lack of toughness, which impairs the reliability of the cermet tool.
＜問題点を解決するための手段＞ この発明は上記した従来技術によるサーメットの表面硬
化層の欠陥を解消するべく検討の結果得られたものであ
る。<Means for Solving Problems> The present invention has been obtained as a result of studies for solving the above-mentioned defects in the surface-hardened layer of the cermet according to the prior art.
即ち、この発明はサーメットを従来技術によって窒素雰
囲気中1350〜1550℃で焼結したのち、焼結温度より1200
℃までを55℃／分以上、好ましくは100℃／分以上の冷
却速度で冷却することを特徴とするTiCN基サーメット焼
結法を提供するものである。That is, according to the present invention, cermet was sintered at 1350 to 1550 ° C. in a nitrogen atmosphere by a conventional technique, and then 1200
The present invention provides a TiCN-based cermet sintering method characterized by cooling up to 55 ° C. at a cooling rate of 55 ° C./min or more, preferably 100 ° C./min or more.
熱伝導率の高い気体とは、例えば水素、ヘリウム、一酸
化炭素などである。The gas having high thermal conductivity is, for example, hydrogen, helium, carbon monoxide or the like.
サーメットの表面硬化層がなぜ生じるかについては種々
異論のあるところであるが、チタンとタンタル、ニオ
ブ、モリブデン、タングステンなどの複炭窒化物を鉄、
ニッケル、コバルト、クロム、モリブデン、タングステ
ンなどの金属で結合した焼結硬質合金であるサーメット
が、焼結温度において生じる液相から冷却中に硬質分散
相が生じる際に、焼結体と焼結雰囲気とが非平衡な状態
となり、その結果、焼結体内に組成の不均一が生じるた
め、と考えられる。そのため、この焼結体に生じた液相
から硬質分散相が冷却中に生じる際に、組成の不均一が
生じない、もしくはたとえ生じても無視しうる程度に抑
えるためには、焼結温度から該サーメットの液相出現温
度までを十分なる速度で急速冷却してやればよい。There are various disagreements as to why the surface-hardened layer of cermet is formed, but titanium and tantalum, niobium, molybdenum, tungsten, etc.
Cermet, which is a sintered hard alloy that is bound by metals such as nickel, cobalt, chromium, molybdenum, and tungsten, has a sintered body and a sintering atmosphere when a hard dispersed phase is generated during cooling from the liquid phase generated at the sintering temperature. This is considered to be due to the non-equilibrium state of and resulting in non-uniform composition in the sintered body. Therefore, when a hard dispersed phase is generated during cooling from the liquid phase generated in this sintered body, compositional non-uniformity does not occur, or even if it occurs, in order to suppress it to a negligible level, from the sintering temperature The liquid phase appearance temperature of the cermet may be rapidly cooled at a sufficient rate.
具体的には焼結温度より1200℃までを急速冷却してやれ
ばよい。この際、1200℃以下まで急速冷却しても効果に
変りはなく、1200℃以上で急速冷却を中止すると、表面
硬質層が完全になくならないため好ましくない。Specifically, the temperature may be rapidly cooled from the sintering temperature to 1200 ° C. At this time, the effect does not change even if it is rapidly cooled to 1200 ° C. or less, and if the rapid cooling is stopped at 1200 ° C. or more, the hard surface layer is not completely lost, which is not preferable.
急冷速度としては、55℃／分以上、好ましくは100℃／
分以上が必要である。また急冷する方法としては、種々
考えられるが、工業的にはさきに記したように、水素、
ヘリウム、一酸化炭素、窒素ガスなど熱伝導率の高いガ
スを用いるガス冷却が適当である。具体的には300゜Ｋ
における熱伝導率が2.6×10-4w/cm・deg以上のものであ
れば、ほぼ冷却速度が70℃／分以上になることがわかっ
た。The quenching rate is 55 ℃ / min or more, preferably 100 ℃ /
Need more than a minute. There are various possible methods for quenching, but as described previously industrially, hydrogen,
Gas cooling using a gas having a high thermal conductivity such as helium, carbon monoxide, or nitrogen gas is suitable. Specifically, 300 ° K
It was found that when the thermal conductivity at 2.6 × 10 -4 w / cm · deg or more was about 70 ° C / min or more.
＜実施例＞ 以下、この発明を実施例により詳細に説明する。<Examples> Hereinafter, the present invention will be described in detail with reference to Examples.
実施例 合金の組成を（Ti0.85Ta0.05Mo0.05Ｗ0.05）（Ｃ0.88Ｎ
0.12）−８重量％Co−４重量％Niとなるように真空中、
1450℃で焼結したのち、H2,He,Arの３種類のガスを夫々
300Torrにてガス冷却を行なった。夫々のガスを300゜Ｋ
での熱伝導率と1200℃までの冷却時間、冷却速度を第１
表に示した。Example The composition of the alloy is (Ti 0.85 Ta 0.05 Mo 0.05 W 0.05 ) (C 0.88 N
0.12 ) -8 wt% Co-4 wt% Ni in vacuum,
After sintering at 1450 ℃, H 2 gas, He gas, and Ar gas are used.
Gas cooling was performed at 300 Torr. 300 ° K for each gas
The thermal conductivity at 1, the cooling time up to 1200 ℃, and the cooling rate
Shown in the table.
次にこれらのチップＡ、Ｂ、Ｃを用いて、下記の切削条
件で切削テストを行なった。 Next, using these chips A, B and C, a cutting test was conducted under the following cutting conditions.
切削条件 被削材 SCM 415（HB＝160） φ30mmディスク端面 切削速度 300m/min 送り 0.1mm/rev 切り込み 0.12mm ホルダー PCLNR 2525−43 チップ形状 CNMG120408N−SK 切削個数 各コーナー100ピース 上記条件にて各チップ100コーナーづつ切削したとこ
ろ、チップＡは欠損率が２％、Ｂは３％であったのに対
し、Ｃは29％ちなみに従来技術になるチップでは43％も
のコーナーが欠損した。Cutting conditions Work material SCM 415 (H B = 160) φ30mm Disc end face Cutting speed 300m / min Feed 0.1mm / rev Depth of cut 0.12mm Holder PCLNR 2525-43 Chip shape CNMG120408N-SK Cutting number 100 pieces at each corner Each of the above conditions When 100 chips of each chip were cut, the chip A had a defect rate of 2% and the chip B had a defect rate of 3%, whereas the chip C had a chip loss of 29% and the chip of the prior art had a chip loss of 43%.
＜発明の効果＞ 以上説明したように、この発明によれば欠損の少ない、
靱性に富む高信頼性のサーメット切削工具が得られるこ
とが認められた。<Effects of the Invention> As described above, according to the present invention, there are few defects,
It was confirmed that a highly reliable cermet cutting tool with high toughness was obtained.
フロントページの続き (72)発明者 清水 靖弘 兵庫県伊丹市昆陽北１丁目１番１号 住友 電気工業株式会社伊丹製作所内 (56)参考文献 特開 昭60−110838（ＪＰ，Ａ) 特開 昭60−2648（ＪＰ，Ａ) 特開 昭61−84350（ＪＰ，Ａ)Front Page Continuation (72) Inventor Yasuhiro Shimizu 1-1-1 Kunyokita, Itami City, Hyogo Prefecture Sumitomo Electric Industries, Ltd. Itami Works (56) Reference JP-A-60-110838 (JP, A) JP-A-SHO 60-2648 (JP, A) JP 61-84350 (JP, A)
Claims (1)
タングステンなどの複炭窒化物を鉄、ニッケル、コバル
ト、クロム、モリブデン、タングステンからなる群より
選んだ１種以上の金属で結合したTiCN基サーメットを焼
結するに当り、窒素雰囲気中1350℃〜1550℃で焼結した
のち、該焼結温度より1200℃までを55℃／分以上の冷却
速度で熱伝導率が300゜Ｋにおいて、2.6×10-4w/cm・de
g以上のガスを冷却媒体とするガス冷却を用いて冷却す
ることを特徴とするTiCN基サーメットの焼結法。1. Titanium and tantalum, niobium, molybdenum,
In sintering TiCN-based cermet in which double carbonitride such as tungsten is bonded with one or more metals selected from the group consisting of iron, nickel, cobalt, chromium, molybdenum, and tungsten, 1350 ° C to 1550 in a nitrogen atmosphere After sintering at ℃, from the sintering temperature up to 1200 ℃ at a cooling rate of 55 ℃ / min or more and a thermal conductivity of 300 ℃, 2.6 × 10 -4 w / cm · de
A method for sintering a TiCN-based cermet, which comprises cooling by using gas cooling using a gas of g or more as a cooling medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61200519A JPH0791604B2 (en) | 1986-08-27 | 1986-08-27 | Sintering method of TiCN-based cermet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61200519A JPH0791604B2 (en) | 1986-08-27 | 1986-08-27 | Sintering method of TiCN-based cermet |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6242630A Division JPH07150286A (en) | 1994-10-06 | 1994-10-06 | Ticn-based cermet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6357732A JPS6357732A (en) | 1988-03-12 |
| JPH0791604B2 true JPH0791604B2 (en) | 1995-10-04 |
Family
ID=16425659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61200519A Expired - Lifetime JPH0791604B2 (en) | 1986-08-27 | 1986-08-27 | Sintering method of TiCN-based cermet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0791604B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0620563Y2 (en) * | 1989-05-26 | 1994-06-01 | 泰三 山田 | Device for attaching / detaching turtle boards |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE440753B (en) * | 1983-05-13 | 1985-08-19 | Santrade Ltd | CUTTING PROCESSING TOOLS EXISTING CORE AND WRAP |
| JPS60110838A (en) * | 1983-11-16 | 1985-06-17 | Sumitomo Electric Ind Ltd | Sintered hard alloy and its production |
| JPS6184350A (en) * | 1984-10-03 | 1986-04-28 | Sumitomo Electric Ind Ltd | Sintered hard alloy and its manufacture |
-
1986
- 1986-08-27 JP JP61200519A patent/JPH0791604B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6357732A (en) | 1988-03-12 |
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