JPH11315363A - Vacuum carburization treatment - Google Patents
Vacuum carburization treatmentInfo
- Publication number
- JPH11315363A JPH11315363A JP11048636A JP4863699A JPH11315363A JP H11315363 A JPH11315363 A JP H11315363A JP 11048636 A JP11048636 A JP 11048636A JP 4863699 A JP4863699 A JP 4863699A JP H11315363 A JPH11315363 A JP H11315363A
- Authority
- JP
- Japan
- Prior art keywords
- carburizing
- pressure
- cost
- gas
- furnace
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は鉄鋼材料の真空浸炭
処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for vacuum carburizing steel material.
【０００２】[0002]
【従来の技術】鉄鋼材料の浸炭には、従来からガス浸
炭、真空浸炭、プラズマ浸炭等が行われている。ガス浸
炭は現状広く行われているが、可燃ガスによる安全性、
処理品表面の粒界酸化、高温浸炭による短サイクル化が
難しい等の問題点がある。またプラズマ浸炭は設備コス
トが高く特殊浸炭に限定されている。真空浸炭は９００
〜１０００℃で浸炭ガスとして飽和炭化水素（メタンガ
ス、プロパンガス、ブタンガス）を用い１０〜７０ｋＰ
ａの圧力で処理する方法が取られている。2. Description of the Related Art Conventionally, gas carburization, vacuum carburization, plasma carburization, and the like have been used for carburizing steel materials. Although gas carburizing is currently widely practiced, safety due to combustible gas,
There are problems such as difficulty in shortening the cycle due to grain boundary oxidation on the surface of the treated product and high-temperature carburization. In addition, plasma carburizing has high equipment costs and is limited to special carburizing. Vacuum carburizing is 900
10 to 70 kP using saturated hydrocarbons (methane gas, propane gas, butane gas) as carburizing gas at ~ 1000 ° C
The method of processing with the pressure of a is adopted.
【０００３】しかし、従来からの真空浸炭法は、設備費
が高いこと、煤によるメンテナンスの困難さ、ランニン
グコストが高いこと等の問題点があった。そこで、ラン
ニングコストを低減するために例えば、特開平８−３２
５７０１号公報では、鎖式不飽和炭化水素であるアセチ
レン系ガスを使用して、１ｋＰａ以下での真空浸炭処理
を行う方法が開示されている。[0003] However, the conventional vacuum carburizing method has problems such as high equipment cost, difficulty in maintenance due to soot, and high running cost. In order to reduce the running cost, for example, Japanese Patent Application Laid-Open No. 8-32
No. 5701 discloses a method of performing a vacuum carburizing treatment at 1 kPa or less using an acetylene-based gas which is a chain unsaturated hydrocarbon.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、アセチ
レンは圧力をかけると爆発しやすいガスであり取扱が難
しく面倒である。また、高圧力下で動作させると煤の発
生が多くなるため、低圧下（１ｋＰａ以下）で動作さ
せ、大型の真空ポンプやメカニカルブースターポンプが
必要になり、設備が複雑になるとともに設備費が著しく
高価になるという問題があった。また、前述した通常の
真空浸炭では浸炭装置内に付着する煤がメンテナンスを
煩雑にしており、これもランニングコストを高くしてい
る。However, acetylene is a gas that easily explodes when pressure is applied, and is difficult and difficult to handle. In addition, when operated under high pressure, soot generation increases. Therefore, operation under low pressure (1 kPa or less) requires a large-sized vacuum pump or mechanical booster pump, which complicates equipment and significantly increases equipment costs. There was a problem that it became expensive. Further, in the above-mentioned ordinary vacuum carburizing, soot adhering in the carburizing apparatus complicates maintenance, which also increases running costs.
【０００５】本発明の課題は、上記問題点に鑑みて、よ
り取扱が容易で設備費が安価でメンテナンスの容易な真
空浸炭処理方法を提供することである。さらに詳細には
炉内に装荷されたワーク全体の表面に均一に浸炭層を形
成するとともに、真空浸炭に必要な排気ポンプの容量を
小さくすることにより設備コストを低減し、かつ炉内の
煤の発生を抑えることにより設備のメンテナンス性を著
しく改善し、さらには原料ガスの消費量及びコストを低
減させた真空浸炭処理方法を提供することである。It is an object of the present invention to provide a vacuum carburizing method that is easier to handle, has lower equipment costs, and is easier to maintain in view of the above problems. In more detail, a carburized layer is formed uniformly on the entire surface of the work loaded in the furnace, and the equipment cost is reduced by reducing the capacity of an exhaust pump required for vacuum carburizing, and soot in the furnace is reduced. An object of the present invention is to provide a vacuum carburizing method in which maintenance is greatly improved by suppressing generation of the gas, and further, consumption and cost of raw material gas are reduced.
【０００６】[0006]
【課題を解決するための手段】ところで、特開平８−３
２５７０１号公報ではアセチレンなどの鎖式不飽和炭化
水素を使用する旨記載されているが、具体的にはアセチ
レン系ガス以外のガスについて開示されていない。ま
た、エチレンガスの使用については全く記載されていな
い。そこで、本発明者らは、特開平８−３２５７０１の
実施例に記載のアセチレンガスに代えて工業的にも多く
使われて安価なエチレンガスでの試験を行ったが、この
方法では結局所望の浸炭層を得ることができなかった。
そこで、本発明者らは、研究の結果、エチレンを原料と
し、真空浸炭処理炉内の圧力を１〜１０ｋＰａに調整し
て真空浸炭処理を行うことにより炉内に装荷されたワー
ク全体の表面に均一に浸炭層を形成することができるこ
とを知得した。特に、エチレンガスを使用した場合に、
圧力が１ｋＰａ以下では浸炭が不十分となり、１０ｋＰ
ａを超えると煤の発生が多くなることを知得した。Means for Solving the Problems Incidentally, Japanese Patent Application Laid-Open No. Hei 8-3
No. 25701 discloses that a chain unsaturated hydrocarbon such as acetylene is used, but specifically does not disclose gases other than acetylene-based gas. Also, there is no description about the use of ethylene gas. Thus, the present inventors conducted tests using inexpensive ethylene gas which is widely used industrially in place of the acetylene gas described in the examples of JP-A-8-325701. A carburized layer could not be obtained.
Therefore, the present inventors have conducted a study, using ethylene as a raw material, and adjusting the pressure in the vacuum carburizing furnace to 1 to 10 kPa to perform the vacuum carburizing process, whereby the entire surface of the work loaded in the furnace is treated. It has been found that a carburized layer can be formed uniformly. In particular, when using ethylene gas,
If the pressure is 1 kPa or less, carburization becomes insufficient and 10 kP
It has been found that when the value exceeds a, the generation of soot increases.
【０００７】この知得により、本発明においては、真空
浸炭処理方法において、浸炭ガスとしてエチレンガスを
用い、かつ１ｋＰａを超え１０ｋＰａ以下の圧力下で浸
炭処理を行う真空浸炭方法を提供することによって上記
課題を解決した。According to this knowledge, the present invention provides a vacuum carburizing method in which ethylene gas is used as a carburizing gas and carburizing is performed under a pressure of more than 1 kPa and 10 kPa or less. Solved the problem.
【０００８】エチレンガスを使用すれば、炉内圧力を１
〜１０ｋＰａの範囲まで上げられるため、アセチレンを
原料とした場合の１ｋＰａ以下に比べると真空浸炭処理
に必要な排気ポンプの容量を著しく小さくできる。また
炉内圧力を１〜１０ｋＰａの範囲に設定することにより
煤の発生を抑えることができる。さらには原料ガスとし
てエチレンガスを用いるようにしたのでコストを低減さ
せることができ、また爆発しにくくなる。[0008] If ethylene gas is used, the pressure in the furnace becomes 1
Since the pressure can be increased to the range of 10 kPa to 10 kPa, the capacity of the exhaust pump required for vacuum carburizing can be significantly reduced as compared with 1 kPa or less when acetylene is used as a raw material. In addition, generation of soot can be suppressed by setting the furnace pressure in a range of 1 to 10 kPa. Further, since ethylene gas is used as a raw material gas, cost can be reduced and explosion is unlikely.
【０００９】[0009]
【実施例】（実施例１）次に本発明の真空浸炭処理方法
により、浸炭処理した第一の実施例について説明する。
第一の実施例においては、内径１２００ｍｍ、長さ１５
００ｍｍ、内容積約１．７ｍ3 の円筒形の浸炭室を持つ
真空浸炭装置に、外形２０ｍｍ、長さ１０ｍｍの鋼材Ｓ
ＣＭ４１５（ＪＩＳ Ｇ ４１０５記載）相当の丸棒を
３０個装荷し、エチレンガスを１Ｌｉｔ／分の流量で浸
炭室内へ供給し、炉内圧力３ｋＰａ、炉内温度１０００
℃の条件下で１時間の浸炭処理を行った。浸炭処理中の
煤の発生はなかった。さらに、浸炭時間完了後、油冷に
より焼き入れした。その後、ワーク表面からの炭素濃度
を分析したところ、炭素濃度が０．３％になる表面から
の距離は丸棒の円筒面の先端部、中央部それぞれにおい
て、約０．９ｍｍとなり、十分で均一な浸炭深さを得る
ことができた。(Embodiment 1) Next, a first embodiment in which carburizing is performed by the vacuum carburizing method of the present invention will be described.
In the first embodiment, the inner diameter is 1200 mm and the length is 15 mm.
In a vacuum carburizing apparatus having a cylindrical carburizing chamber having a diameter of 00 mm and an internal volume of about 1.7 m 3 , a steel material S having an outer diameter of 20 mm and a length of 10 mm
30 round bars equivalent to CM415 (described in JIS G 4105) were loaded, ethylene gas was supplied into the carburizing chamber at a flow rate of 1 lit / min, the furnace pressure was 3 kPa, and the furnace temperature was 1000.
Carburizing treatment was performed for 1 hour under the condition of ° C. No soot was generated during the carburizing process. Furthermore, after the carburizing time was completed, it was quenched by oil cooling. After that, when the carbon concentration from the work surface was analyzed, the distance from the surface where the carbon concentration became 0.3% was about 0.9 mm at the tip and the center of the cylindrical surface of the round bar, which was sufficient and uniform. A high carburizing depth.
【００１０】また浸炭ガスの圧力を３ｋＰａとしたの
で、浸炭室内の排気は最大排気流量が３０００Ｌｉｔ／
分、モーター容量３．７ｋｗの真空ポンプ１台で十分排
気が可能であり、アセチレンガスを用いた際に必要であ
った、高価なメカニカルブースターポンプは不要であ
る。Further, since the pressure of the carburizing gas is set to 3 kPa, the maximum exhaust flow rate of the exhaust gas in the carburizing chamber is 3000 Lite /
One vacuum pump having a motor capacity of 3.7 kW can sufficiently exhaust gas, and an expensive mechanical booster pump, which was necessary when acetylene gas was used, is unnecessary.
【００１１】（実施例２）さらに、本発明の真空浸炭処
理方法により、浸炭処理した第二の実施例について説明
する。第二の実施例においては、第一の実施例で用いた
ものと同じ真空浸炭装置を用い、外形２０ｍｍ、長さ１
０ｍｍの鋼材ＳＣＭ４１５（ＪＩＳ Ｇ４１０５記載）
相当の丸棒を、炉内に５個おき、エチレンガスを１Ｌｉ
ｔ／分の流量で浸炭室内へ供給し、炉内圧力６ｋＰａ、
炉内温度１０００℃の条件下で１時間の浸炭処理を行っ
た。浸炭時間完了後、油冷により焼き入れした。その
後、ワーク表面からの炭素濃度を分析したところ、炭素
濃度が０．３％になる表面からの距離は約０．９ｍｍで
あり、十分な浸炭深さを得ることができた。さらに、浸
炭深さのバラツキは±０．０５ｍｍ以内であり均一に浸
炭されていた。(Embodiment 2) Further, a second embodiment in which carburizing is performed by the vacuum carburizing method of the present invention will be described. In the second embodiment, the same vacuum carburizing apparatus as that used in the first embodiment was used, with an outer shape of 20 mm and a length of 1 mm.
0mm steel SCM415 (JIS G4105 described)
Put 5 round rods in the furnace and add ethylene gas to 1Li
t / min flow rate into the carburizing chamber, furnace pressure 6 kPa,
Carburizing treatment was performed for one hour under the condition of a furnace temperature of 1000 ° C. After the carburizing time was completed, it was quenched by oil cooling. Thereafter, when the carbon concentration from the work surface was analyzed, the distance from the surface where the carbon concentration was 0.3% was about 0.9 mm, and a sufficient carburizing depth could be obtained. Furthermore, the variation in carburizing depth was within ± 0.05 mm, indicating that the carburizing was uniform.
【００１２】[0012]
【発明の効果】本発明は鉄鋼材料の真空浸炭方法におい
て、真空浸炭処理方法において、浸炭ガスとしてエチレ
ンガスを用い、かつ１〜１０ｋＰａの圧力下で浸炭処理
を行い、煤の発生を抑えつつ炉内に装荷されたワーク全
体の表面に均一に浸炭層を形成することができるので、
取扱が容易で設備費が安価でメンテナンスの掛からない
真空浸炭処理方法を提供するものとなった。According to the present invention, there is provided a vacuum carburizing method for a steel material. In the vacuum carburizing method, an ethylene gas is used as a carburizing gas and a carburizing process is performed under a pressure of 1 to 10 kPa to suppress the generation of soot. Since the carburized layer can be formed uniformly on the entire surface of the work loaded inside,
The present invention provides a vacuum carburizing method that is easy to handle, has low equipment costs, and requires no maintenance.
【００１３】より、詳述すれば、エチレンガスを用いる
ことにより炉内圧力を１ｋＰａ以上と比較的高くでき、
高価なメカニカルブースターポンプも不要であり、真空
浸炭に必要な排気ポンプの容量も小さくすることができ
るので、設備コストが低減する。More specifically, by using ethylene gas, the pressure in the furnace can be made relatively high at 1 kPa or more,
An expensive mechanical booster pump is not required, and the capacity of an exhaust pump required for vacuum carburization can be reduced, so that equipment cost is reduced.
【００１４】また、炉内圧力が１〜１０ｋＰａという比
較的高く、また広い圧力範囲で浸炭処理ができ、また、
炉内の煤の発生を容易に抑えることができるので、設備
のメンテナンス性が著しく改善する。Further, the pressure in the furnace is relatively high of 1 to 10 kPa, and the carburizing treatment can be performed in a wide pressure range.
Since the generation of soot in the furnace can be easily suppressed, the maintainability of the equipment is significantly improved.
【００１５】さらには原料ガスに価格が安く、爆発しに
くいエチレンガスを使用したので、ガス費用を低減で
き、取扱が容易で、処理のし易い真空浸炭処理方法を提
供するものとなった。また、これに使用する浸炭処理装
置も低コスト、長寿命となり、今後の真空浸炭の普及に
つながり産業上非常に有益である。Further, since ethylene gas which is inexpensive and hard to explode is used as a raw material gas, a gas carburizing method which can reduce gas cost, is easy to handle, and is easy to treat is provided. Also, the carburizing apparatus used for this has a low cost and a long life, which leads to the spread of vacuum carburizing in the future and is very useful in industry.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡田 徹也 富山県富山市不二越本町一丁目１番１号株 式会社不二越内 (72)発明者 今井 直明 富山県富山市北代村巻10番 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Okada 1-1-1, Fujikoshi Honcho, Toyama City, Toyama Pref.
Claims (1)
してエチレンガスを用い、かつ１〜１０ｋＰａの圧力下
で浸炭処理を行うことを特徴とする真空浸炭方法。1. A vacuum carburizing method in which ethylene gas is used as a carburizing gas and carburizing is performed under a pressure of 1 to 10 kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11048636A JP3046293B2 (en) | 1998-03-05 | 1999-02-25 | Vacuum carburizing method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-71304 | 1998-03-05 | ||
| JP7130498 | 1998-03-05 | ||
| JP11048636A JP3046293B2 (en) | 1998-03-05 | 1999-02-25 | Vacuum carburizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11315363A true JPH11315363A (en) | 1999-11-16 |
| JP3046293B2 JP3046293B2 (en) | 2000-05-29 |
Family
ID=26388939
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11048636A Expired - Lifetime JP3046293B2 (en) | 1998-03-05 | 1999-02-25 | Vacuum carburizing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3046293B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6846366B2 (en) | 2001-01-19 | 2005-01-25 | Oriental Engineering Co., Ltd. | Carburizing method and carburizing apparatus |
| US7357843B2 (en) | 2001-11-30 | 2008-04-15 | Koyo Thermo Systems Co., Ltd. | Vacuum heat treating method and apparatus therefor |
| US7811390B2 (en) | 2007-03-23 | 2010-10-12 | Honda Motor Co., Ltd. | Method for producing carburized parts |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5650739B2 (en) | 2009-08-07 | 2015-01-07 | スウエイジロク・カンパニー | Low temperature carburization under low vacuum |
| US9617632B2 (en) | 2012-01-20 | 2017-04-11 | Swagelok Company | Concurrent flow of activating gas in low temperature carburization |
-
1999
- 1999-02-25 JP JP11048636A patent/JP3046293B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6846366B2 (en) | 2001-01-19 | 2005-01-25 | Oriental Engineering Co., Ltd. | Carburizing method and carburizing apparatus |
| US7357843B2 (en) | 2001-11-30 | 2008-04-15 | Koyo Thermo Systems Co., Ltd. | Vacuum heat treating method and apparatus therefor |
| US7811390B2 (en) | 2007-03-23 | 2010-10-12 | Honda Motor Co., Ltd. | Method for producing carburized parts |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3046293B2 (en) | 2000-05-29 |
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