JP2001011597A - Gas carburizing nitriding method - Google Patents
Gas carburizing nitriding methodInfo
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- JP2001011597A JP2001011597A JP11182100A JP18210099A JP2001011597A JP 2001011597 A JP2001011597 A JP 2001011597A JP 11182100 A JP11182100 A JP 11182100A JP 18210099 A JP18210099 A JP 18210099A JP 2001011597 A JP2001011597 A JP 2001011597A
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- nitriding
- carburizing
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ガス浸炭窒化方法
に関するものである。TECHNICAL FIELD The present invention relates to a gas carbonitriding method.
【０００２】[0002]
【従来の技術】従来、ガス浸炭窒化処理においては、９
００℃以下の処理温度で浸炭と窒化を同時に行う方法、
また９００℃以上の温度で一次加熱として浸炭処理を行
った後、９００℃以下の温度、一般的には８５０℃付近
に降温させて二次加熱を設けて、その温度で窒化を行う
方法が行われていた。2. Description of the Related Art Conventionally, in gas carbonitriding,
A method of simultaneously carburizing and nitriding at a processing temperature of 00 ° C. or less,
In addition, after carburizing as primary heating at a temperature of 900 ° C. or higher, a method of performing nitriding at a temperature of 900 ° C. or less, generally lowering the temperature to around 850 ° C., and providing secondary heating is performed. Had been
【０００３】[0003]
【発明が解決しようとする課題】しかし、９００℃以下
の温度で浸炭と窒化を同時に行う方法では、温度が通常
の浸炭温度より低いため、浸炭処理に時間がかかりすぎ
るので、処理が長時間に及ぶという欠点があった。However, in the method of simultaneously carburizing and nitriding at a temperature of 900 ° C. or less, since the temperature is lower than the normal carburizing temperature, it takes too much time for the carburizing treatment, so that the treatment takes a long time. There was a drawback of extending.
【０００４】また、浸炭処理終了後に窒化処理を行う方
法は、窒化工程追加分だけ時間がかかるし、一次加熱か
ら二次加熱への降温工程の時間も、長時間処理となる原
因となっている。In addition, the method of performing the nitriding treatment after the carburizing treatment requires a time corresponding to the addition of the nitriding step, and the time of the temperature decreasing step from the primary heating to the secondary heating is also a cause of a long time treatment. .
【０００５】また一方では、窒化処理温度をあまり上昇
させると、浸炭処理は行われるものの、炉内で供給され
たＮＨ３ガスの分解が進み、逆に窒化処理が長時間に及
ぶため、鋼材料の結晶粒度が粗大化してしまうことが指
摘されている。[0005] On the other hand, if the nitriding temperature is raised too much, carburizing is performed, but the NH 3 gas supplied in the furnace is decomposed and the nitriding takes a long time. It has been pointed out that the crystal grain size becomes coarse.
【０００６】本発明は、こうした事情に鑑みてなされた
もので、短時間で大きな窒化深さを得ることができるガ
ス浸炭窒化方法を提供しようとするものである。The present invention has been made in view of such circumstances, and has as its object to provide a gas carbonitriding method capable of obtaining a large nitriding depth in a short time.
【０００７】[0007]
【課題を解決するための手段】前記課題を解決するた
め、本発明に係るガス浸炭窒化方法は、浸炭処理に適す
る温度の下で行われる浸炭工程と、該浸炭工程後の降温
工程と、の少なくともいずれかの工程でＮＨ３ガスを供
給して被処理材に窒化処理を施すものである。Means for Solving the Problems In order to solve the above-mentioned problems, a gas carbonitriding method according to the present invention comprises a carburizing step performed at a temperature suitable for carburizing, and a cooling step after the carburizing step. In at least one of the steps, the material to be treated is subjected to a nitriding treatment by supplying an NH 3 gas.
【０００８】好ましい実施の形態では、例えば、前記浸
炭工程で前記ＮＨ３ガスを供給したり、前記降温工程で
前記ＮＨ３ガスを供給したり、あるいは、前記浸炭工程
と前記降温工程とに時間的にまたがって前記ＮＨ３ガス
を供給したりして、前記被処理材に窒化処理を施すこと
ができる。このようにすれば、従来方法より高い温度で
窒化処理が行われるので、短時間で大きな窒化深さを得
ることができる。また、浸炭工程と降温工程にまたがっ
て窒化が行われることによって、浸炭後に材料の結晶粒
度の粗大化がおこることもなく、特別な処理時間を必要
とすることもない。しかも、従来方法の一つで必要とさ
れていた前記二次加熱工程が不要となるので、処理時間
の大幅な短縮に貢献できる。In a preferred embodiment, for example, the NH 3 gas is supplied in the carburizing step, the NH 3 gas is supplied in the cooling step, or the NH 3 gas is supplied to the carburizing step and the cooling step in time. The nitriding treatment can be performed on the material to be processed by supplying the NH 3 gas over the substrate. In this case, the nitriding treatment is performed at a higher temperature than in the conventional method, so that a large nitriding depth can be obtained in a short time. Further, by performing nitriding over the carburizing step and the temperature lowering step, the crystal grain size of the material does not become coarse after carburizing, and no special processing time is required. In addition, since the secondary heating step, which is required in one of the conventional methods, is not required, the processing time can be significantly reduced.
【０００９】前記ＮＨ３ガスの供給開始時点は、例え
ば、前記降温工程の終了時点と、前記被処理材の窒素濃
度を目標値に到達せしめるのに必要な窒化時間と、から
算出することができる。また、前記浸炭工程に適する温
度としては、例えば、９００乃至９５０℃の温度が望ま
しい。[0009] The supply start point of the NH 3 gas can be calculated, for example, from the end point of the temperature lowering step and the nitriding time required to reach the target nitrogen concentration of the material to be treated. . Further, as a temperature suitable for the carburizing step, for example, a temperature of 900 to 950 ° C. is desirable.
【００１０】なお、前記ガス浸炭窒化方法は、温度との
関係に着目して定義すれば、熱処理炉内の温度が浸炭に
適する温度に達した後、焼入温度に至るまでの間に、前
記熱処理炉内にＮＨ３ガスを供給して被処理材に窒化処
理を施す方法と表現することもできる。[0010] The gas carbonitriding method is defined by focusing on the relationship with temperature. After the temperature in the heat treatment furnace reaches a temperature suitable for carburizing, the gas carbonitriding method reaches the quenching temperature. It can also be described as a method in which NH 3 gas is supplied into the heat treatment furnace to perform a nitriding treatment on the material to be processed.
【００１１】[0011]
【発明の実施の形態】以下、添付図面を参照して、本発
明の好適な実施の形態を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１２】図１は、本発明に係るガス浸炭窒化方法に
よる処理工程と、従来のガス浸炭窒化方法の一つによる
処理工程とを、同一時間軸上に示した比較図である。こ
の図を参照すれば、本発明方法の利点の一つである総処
理時間の短縮が視覚的に明らかとなる。FIG. 1 is a comparison diagram showing the processing steps by the gas carbonitriding method according to the present invention and the processing steps by one of the conventional gas carbonitriding methods on the same time axis. Referring to this figure, the reduction of the total processing time, which is one of the advantages of the method of the present invention, is visually evident.
【００１３】図１の上段に示された従来の方法は、一次
加熱工程としての浸炭工程と、該浸炭工程に続いて行わ
れる降温工程（降温期）と、該降温工程に続いて行われ
る二次加熱工程としての窒化工程と、該窒化工程に続い
て行われる焼入れ工程と、を備えた周知の方法である。
この従来の方法では、一次加熱温度Ｔ１の下で浸炭時間
ｔ１と拡散時間ｔ２とを経過することにより前記浸炭工
程が終了し、該浸炭工程後に降温時間ｔ３を経過して降
温工程が終わり、該降温工程後に、二次加熱温度Ｔ２の
下で窒化時間ｔ４を経過することにより窒化工程が終わ
り、その後、前記焼入れ工程が行われる。The conventional method shown in the upper part of FIG. 1 includes a carburizing step as a primary heating step, a cooling step (cooling period) performed following the carburizing step, and a carburizing step performed following the cooling step. This is a known method including a nitriding step as a next heating step and a quenching step performed subsequent to the nitriding step.
In this conventional method, the carburizing step is ended by passing the carburizing time t1 and the diffusion time t2 under the primary heating temperature T1, and after the carburizing step, the temperature lowering time t3 passes and the temperature lowering step ends. After the temperature lowering step, the nitriding step is completed by passing the nitriding time t4 under the secondary heating temperature T2, and then the quenching step is performed.
【００１４】これに対し、図１の下段に示された本発明
の一実施の形態に係るガス浸炭窒化方法は、浸炭工程
と、該浸炭工程に続いて行われる降温工程（降温期）
と、該降温工程に続いて行われる焼入れ工程と、を備え
ている。本実施の形態では、前記従来方法と同一の一次
加熱温度Ｔ１の下で浸炭時間ｔ１と拡散時間ｔ２とを経
過することにより前記浸炭工程が終了し、該浸炭工程後
に降温時間ｔ３を経過して降温工程が終わり、該降温工
程後に、前記焼入れ工程が行われる。そして、窒化工程
は、前記浸炭工程と前記降温工程の少なくともいずれか
の工程で熱処理炉内にＮＨ３ガス（アンモニアガス）を
供給することにより、前記いずれかの工程と同時並行的
に行われる。On the other hand, in the gas carbonitriding method according to one embodiment of the present invention shown in the lower part of FIG. 1, a carburizing step and a cooling step (cooling period) performed subsequent to the carburizing step.
And a quenching step performed subsequent to the temperature lowering step. In the present embodiment, the carburizing step is completed by passing the carburizing time t1 and the diffusion time t2 under the same primary heating temperature T1 as in the conventional method, and the cooling time t3 is passed after the carburizing step. After the cooling step, the quenching step is performed after the cooling step. The nitriding step is performed in parallel with any of the steps by supplying NH 3 gas (ammonia gas) into the heat treatment furnace in at least one of the carburizing step and the temperature lowering step.
【００１５】本実施の形態において、前記浸炭工程は、
従来から浸炭処理に適するとされている温度、すなわ
ち、例えば、９００乃至９５０℃の下で行われる。In the present embodiment, the carburizing step comprises:
It is carried out at a temperature conventionally considered suitable for carburizing, that is, for example, at 900 to 950 ° C.
【００１６】本実施の形態の基本原理は、前記従来の一
方法における前記降温工程後の二次加熱工程における前
記窒化工程を省き、その代わりに、前記浸炭工程と前記
降温工程の少なくともいずれかの工程で窒化処理を並行
的に行う点にある。このようにすれば、従来、時間的に
独立した工程であった窒化工程が他の工程と同時に行わ
れるので、総処理時間を大幅に短縮することができる。
また、従来方法より高い温度で窒化処理が行われること
になるので、短時間で目標窒化深さを得ることができ
る。The basic principle of the present embodiment is that the nitriding step in the secondary heating step after the temperature lowering step in the conventional method is omitted, and instead, at least one of the carburizing step and the temperature lowering step is performed. The point is that nitriding is performed in parallel in the process. By doing so, the nitridation step, which was conventionally a time independent step, is performed simultaneously with the other steps, so that the total processing time can be significantly reduced.
In addition, since the nitriding treatment is performed at a higher temperature than in the conventional method, the target nitriding depth can be obtained in a short time.
【００１７】具体的には、例えば、前記降温期の全期間
に一致させて前記熱処理炉内に前記ＮＨ３ガスを供給す
る。ここで、前記熱処理炉内に装入される被処理材の表
面積が小さい等の理由で、前記降温期の全期間に渡って
窒化処理を行うと窒化深さが深くなりすぎる場合には、
例えば、前記ＮＨ３ガスの供給開始時点を遅らせたり、
前記ＮＨ３ガスの供給停止時点を早めたりして、目標窒
化深さを得るのに必要な時間だけ窒化処理を行うように
すれば良い。Specifically, for example, the NH 3 gas is supplied into the heat treatment furnace so as to coincide with the entire period of the cooling period. Here, if the nitriding treatment is performed over the entire period of the cooling period, the nitriding depth becomes too deep, for example, because the surface area of the material to be treated charged into the heat treatment furnace is small.
For example, the supply start time of the NH 3 gas is delayed,
The nitridation process may be performed only for a time necessary to obtain the target nitriding depth by, for example, earliering the supply stop point of the NH 3 gas.
【００１８】逆に、前記被処理材の表面積が大きかった
り、目標窒化深さが深い等の場合には、前記降温期だけ
を利用した窒化処理では窒化深さ不足となることも予想
される。この場合には、前記ＮＨ３ガスの供給を前記浸
炭工程中から開始すれば良い。前記浸炭工程の初めか
ら、又は該浸炭工程の途中から、前記ＮＨ３ガスの供給
を開始し、前記浸炭工程から前記降温期へと時間的にま
たがって前記ＮＨ３ガスを供給し続け、前記降温期の途
中で、又は該降温期の終了時点で、前記ＮＨ３ガスの供
給を停止することもできる。Conversely, when the surface area of the material to be treated is large or the target nitriding depth is large, it is expected that the nitriding treatment using only the cooling period will result in an insufficient nitriding depth. In this case, the supply of the NH 3 gas may be started during the carburizing step. The supply of the NH 3 gas is started from the beginning of the carburizing step or from the middle of the carburizing step, and the NH 3 gas is continuously supplied from the carburizing step to the temperature lowering period in time, and the temperature lowering is performed. During the period or at the end of the cooling period, the supply of the NH 3 gas may be stopped.
【００１９】また、前記浸炭工程の初めから、又は該浸
炭工程の途中から、前記ＮＨ３ガスを供給し始め、前記
浸炭工程の途中で、又は該浸炭工程の終了と同時に、前
記ＮＨ３ガスの供給を停止してもよい。Further, from the beginning of the carburization step, or from the middle of該浸charcoal step, begins to deliver the NH 3 gas, in the middle of the carburizing process, or該浸charcoal steps and end at the same time, the NH 3 gas The supply may be stopped.
【００２０】前記ＮＨ３ガスの供給開始時点は、次のよ
うにして算出することができる。すなわち、前記熱処理
炉内の残留ＮＨ３の濃度とカーボンポテンシャルとを測
定し、これから窒化ポテンシャルを算出する。そして、
この値を基に、目標窒化深さに応じて、前記被処理材の
窒素濃度を目標値に到達せしめるのに必要な窒化時間
（以下、「必要窒化時間」という。）が定まる。また、
前記被処理材の降温速度と、設定降温終了温度と、か
ら、前記降温期の終了時点を予測することができる。そ
こで、該降温期の終了時点から前記必要窒化時間を差し
引くことにより、前記ＮＨ３ガスの供給開始時点、すな
わち、窒化処理の開始時点を算出することができる。The supply start point of the NH 3 gas can be calculated as follows. That is, the concentration of residual NH 3 and the carbon potential in the heat treatment furnace are measured, and the nitriding potential is calculated from the measured values. And
Based on this value, a nitriding time (hereinafter, referred to as a “required nitriding time”) required to make the nitrogen concentration of the material to be processed reach the target value is determined according to the target nitriding depth. Also,
The end point of the cooling period can be predicted from the cooling rate of the material to be processed and the set cooling end temperature. Therefore, by subtracting the required nitriding time from the end point of the cooling period, the supply start point of the NH 3 gas, that is, the start point of the nitriding treatment can be calculated.
【図１】本発明に係るガス浸炭窒化方法による処理工程
と、従来のガス浸炭窒化方法の一つによる処理工程と
を、同一時間軸上に示した比較図である。BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a comparison diagram showing a processing step by a gas carbonitriding method according to the present invention and a processing step by one of the conventional gas carbonitriding methods on the same time axis.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 横瀬 敬二 東京都千代田区丸の内一丁目８番２号 同 和鉱業株式会社内 (72)発明者 妹尾 達行 東京都千代田区丸の内一丁目８番２号 同 和鉱業株式会社内 Ｆターム(参考） 4K028 AA03 AC08 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Keiji Yokose 1-8-2 Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd. (72) Inventor Tatsuyuki Senoo 1-2-2, Marunouchi, Chiyoda-ku, Tokyo Dowa Mining Co., Ltd. F-term (reference) 4K028 AA03 AC08
Claims (7)
炭工程と、該浸炭工程後の降温工程と、の少なくともい
ずれかの工程でＮＨ３ガスを供給して被処理材に窒化処
理を施すことを特徴とする、ガス浸炭窒化方法。At least one of a carburizing step performed at a temperature suitable for carburizing and a temperature lowering step after the carburizing step supplies an NH 3 gas to perform a nitriding treatment on the material to be treated. A gas carbonitriding method.
て前記被処理材に窒化処理を施すことを特徴とする、請
求項１に記載のガス浸炭窒化方法。2. The gas carbonitriding method according to claim 1, wherein in the carburizing step, the NH 3 gas is supplied to perform a nitriding treatment on the material to be treated.
て前記被処理材に窒化処理を施すことを特徴とする、請
求項１に記載のガス浸炭窒化方法。3. The gas carbonitriding method according to claim 1, wherein the NH 3 gas is supplied in the temperature lowering step to perform a nitriding treatment on the material to be treated.
にまたがって前記ＮＨ３ガスを供給して前記被処理材に
窒化処理を施すことを特徴とする、請求項１に記載のガ
ス浸炭窒化方法。4. The gas carburizing method according to claim 1, wherein the NH 3 gas is supplied temporally over the carburizing step and the cooling step to perform a nitriding treatment on the material to be treated. Nitriding method.
降温工程の終了時点と、前記被処理材の窒素濃度を目標
値に到達せしめるのに必要な窒化時間と、から算出する
ことを特徴とする、請求項１乃至４のいずれか一項に記
載のガス浸炭窒化方法。5. The method according to claim 1, wherein the supply start time of the NH 3 gas is calculated from a termination time point of the temperature lowering step and a nitriding time required to make the nitrogen concentration of the material to be processed reach a target value. The gas carbonitriding method according to any one of claims 1 to 4, wherein
達した後、焼入温度に至るまでの間に、前記熱処理炉内
にＮＨ３ガスを供給して被処理材に窒化処理を施すこと
を特徴とするガス浸炭窒化方法。6. After the temperature in the heat treatment furnace reaches a temperature suitable for carburizing and before reaching the quenching temperature, NH 3 gas is supplied into the heat treatment furnace to perform a nitriding treatment on the material to be treated. A gas carbonitriding method characterized by the above-mentioned.
乃至９５０℃である、請求項１乃至６のいずれか一項に
記載のガス浸炭窒化方法。7. The carburizing temperature in the carburizing step is 900.
The gas carbonitriding method according to any one of claims 1 to 6, wherein the temperature is from 950C to 950C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18210099A JP3849742B2 (en) | 1999-06-28 | 1999-06-28 | Gas carbonitriding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18210099A JP3849742B2 (en) | 1999-06-28 | 1999-06-28 | Gas carbonitriding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001011597A true JP2001011597A (en) | 2001-01-16 |
| JP3849742B2 JP3849742B2 (en) | 2006-11-22 |
Family
ID=16112354
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005200695A (en) * | 2004-01-14 | 2005-07-28 | Onex Corp | Gas carburizing method |
| WO2007066441A1 (en) * | 2005-12-08 | 2007-06-14 | Ntn Corporation | Method of carbonitriding, process for producing machine part, and machine part |
| WO2007116875A1 (en) * | 2006-04-07 | 2007-10-18 | Ntn Corporation | Carbonitriding process, process for production of machine parts, and machine parts |
| CN109252133A (en) * | 2018-11-09 | 2019-01-22 | 常州天山重工机械有限公司 | A kind of process improving quenched and tempered steel nitriding part surface quality |
-
1999
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005200695A (en) * | 2004-01-14 | 2005-07-28 | Onex Corp | Gas carburizing method |
| WO2007066441A1 (en) * | 2005-12-08 | 2007-06-14 | Ntn Corporation | Method of carbonitriding, process for producing machine part, and machine part |
| US8747572B2 (en) | 2005-12-08 | 2014-06-10 | Ntn Corporation | Carbonitriding method, machinery component fabrication method, and machinery component |
| WO2007116875A1 (en) * | 2006-04-07 | 2007-10-18 | Ntn Corporation | Carbonitriding process, process for production of machine parts, and machine parts |
| US9062355B2 (en) | 2006-04-07 | 2015-06-23 | Ntn Corporation | Carbonitriding method, machinery component fabrication method, and machinery component |
| CN109252133A (en) * | 2018-11-09 | 2019-01-22 | 常州天山重工机械有限公司 | A kind of process improving quenched and tempered steel nitriding part surface quality |
| CN109252133B (en) * | 2018-11-09 | 2020-12-08 | 常州天山重工机械有限公司 | Process method for improving surface quality of quenched and tempered steel nitriding part |
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| Publication number | Publication date |
|---|---|
| JP3849742B2 (en) | 2006-11-22 |
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