JPS61572A - Cementing method of steel - Google Patents
Cementing method of steelInfo
- Publication number
- JPS61572A JPS61572A JP59119483A JP11948384A JPS61572A JP S61572 A JPS61572 A JP S61572A JP 59119483 A JP59119483 A JP 59119483A JP 11948384 A JP11948384 A JP 11948384A JP S61572 A JPS61572 A JP S61572A
- Authority
- JP
- Japan
- Prior art keywords
- steel material
- powder
- plasma
- working gas
- steel
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の技術分野）
本発明はプラズマトーチな用いて鋼材の表面に浸炭処理
を施す方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a method of carburizing the surface of a steel material using a plasma torch.
（発明の従来技術とその問題点）
一般に低炭素鋼は加熱焼入れしても充分な硬度が得られ
ないため、浸炭処理を施して硬度を高めるようにしてい
る。斯る浸炭処理として従来から用いられている方法は
、加熱下において、鋼材を固体浸炭剤、ガス浸炭剤或い
は液体浸炭剤に浸漬し、鋼材表面に浸炭層を形成するよ
うにしたものであり、この従来方法によると局部的に浸
炭を施すには鋼材に防浸宝前処理を施さなければならな
かった。(Prior Art of the Invention and Problems Therewith) In general, low carbon steel cannot obtain sufficient hardness even when heated and quenched, so it is carburized to increase its hardness. The method conventionally used for such carburizing treatment is to immerse the steel material in a solid carburizing agent, gas carburizing agent, or liquid carburizing agent under heating to form a carburized layer on the surface of the steel material. According to this conventional method, in order to locally carburize the steel material, it was necessary to apply an anti-corrosion pretreatment to the steel material.
そこで、プラズマトーチを用いて鋼材を局部的に加熱し
、この加熱部分に浸炭を施すことで前処理を不要とした
方法が特公昭５７−２２４４号として提案されている。Therefore, Japanese Patent Publication No. 57-2244 proposes a method in which a plasma torch is used to locally heat the steel material and the heated portion is carburized, thereby eliminating the need for pretreatment.
しかしながら、上記方法はプラズマアークによって溶融
せしめられた溶融部にメタンガス等の炭化水素系ガスを
吹きつけて反応させるものであるため、浸炭させるのに
長時間を要し、また炭素濃度を一定以上に高めることが
困難で、耐摩耗性に優れたレデブライト（オーステナイ
トとセメンタイトとの共晶）を形成することができない
。However, since the above method involves blowing a hydrocarbon gas such as methane gas onto the molten part melted by a plasma arc to cause a reaction, it takes a long time to carburize, and the carbon concentration does not exceed a certain level. It is difficult to increase the hardness and cannot form ledebrite (eutectic of austenite and cementite), which has excellent wear resistance.
（発明の目的）
本発明は上述した従来の浸炭方法における問題点を改善
すべく成したものであり、その目的とする処は、鋼材に
前処理を施すことなく一部のみを短時間で浸炭でき、し
かも浸炭濃度を高くし得る鋼材の浸炭方法を提供するに
ある。(Objective of the Invention) The present invention was made to improve the problems in the conventional carburizing method described above, and its purpose is to carburize only a portion of the steel material in a short time without pre-treating it. It is an object of the present invention to provide a method for carburizing steel materials, which can increase the carburizing concentration.
（発明の構成）
上記目的を達成すべく本発明はプラズマトーチを用いて
鋼材の表面を溶融せしめるとともに、この溶融部にグラ
ファイト或いは炭素化合物を粉末状態で供給するように
したことをその構成とする。(Structure of the Invention) In order to achieve the above object, the present invention uses a plasma torch to melt the surface of a steel material, and supplies graphite or a carbon compound in the form of powder to the melted part. .
（実施例） 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the accompanying drawings.
第１図は本発明方法の実施に使用するプラズマトーチの
一部を切欠した断面図であり、プラズマトーチ（１）は
中空状のシールドキャップ（２）内に銅製のノズルチッ
プ（３）を配設し、シールドキャップ（２）とノズルチ
ップ（３）との間に不活性ガス等のシールドガスの通路
（４）を形成している。またノズルチップ（３）の中心
にはアルゴンガス等の作動ガスの通路（５）を形成する
とともにこの通路（５）の周囲に冷却通路（＠）を形成
している。そして、作動ガスの通路（５）内にはタング
ステン電極（７）を設け、更に通路（５）の下端をプラ
ズマガス噴出孔（８）としている、更に前記シールドキ
ャップ（２）には筒状ガイド（９）、（９）を斜めに貫
通して取付け、この筒状ガイド（Ｉｌｌ）、（９）に粉
未導入管（１０）をその軸線の延長がプラズマガス噴出
孔（８）の軸線の延長と交わるように挿通固着している
。FIG. 1 is a partially cutaway sectional view of a plasma torch used to carry out the method of the present invention, and the plasma torch (1) has a copper nozzle tip (3) arranged inside a hollow shield cap (2). A passageway (4) for a shielding gas such as an inert gas is formed between the shielding cap (2) and the nozzle tip (3). Further, a passage (5) for a working gas such as argon gas is formed in the center of the nozzle tip (3), and a cooling passage (@) is formed around this passage (5). A tungsten electrode (7) is provided in the working gas passage (5), and the lower end of the passage (5) is a plasma gas ejection hole (8). (9), (9) are installed diagonally through the pipe (9), and the non-powder introduction tube (10) is attached to this cylindrical guide (Ill), (9) so that the extension of its axis is in line with the axis of the plasma gas nozzle (8). It is inserted and fixed so that it intersects with the extension.
以上の構成からなるプラズマトーチ（１）を用いた浸炭
方法を以下に述べる。A carburizing method using the plasma torch (1) having the above configuration will be described below.
先ず、タングステン電極（７）を一方の電極とし鋼材（
１１）を他方の電極として、これらを直流電源に接続す
るとともに、シールドガス通路（０からシールドガスな
流し、作動ガス通路（５）から作動ガスを流す。First, use the tungsten electrode (7) as one electrode and use the steel material (
11) as the other electrode, these are connected to a DC power source, and the shielding gas is allowed to flow from the shielding gas passage (0), and the working gas is made to flow from the working gas passage (5).
すると、電極間で放電が生じ、作動ガスがプラズマ化し
、このプラズマガスがプラズマガス噴出孔（８）にて絞
られ高温高速のプラズマアーク（１２）として噴出する
。噴出したプラズマアーク（１２）はダンゲステン電極
（７）に対してプラス電位を有する鋼材（１１）の表層
部に吹付けられ、この部分に溶融部（１３）を形成する
。Then, an electric discharge occurs between the electrodes, the working gas is turned into plasma, and this plasma gas is squeezed through the plasma gas nozzle (8) and ejected as a high-temperature, high-speed plasma arc (12). The ejected plasma arc (12) is blown onto the surface layer of the steel material (11) which has a positive potential with respect to the Dungesten electrode (7), forming a molten part (13) in this part.
一方、上記の操作と併行して、粉未導入管（１０）を介
してプラズマアーク（１２）に粉末材（１４）を供給す
る。ここで、使用する粉末材としてはグラファイト粉末
或いは炭素化合物粉末とする。On the other hand, in parallel with the above operation, powder material (14) is supplied to the plasma arc (12) via the powder-unintroduced tube (10). Here, the powder material used is graphite powder or carbon compound powder.
而して、プラズマアーク（１２）に向けて供給された粉
末材（１４）はプラズマアーク（１２）中に封じ込めら
れ、高温高速にて溶融部（１３）にたたき込まれ、ここ
に炭素濃度の高い浸炭層が形成される。The powder material (14) supplied towards the plasma arc (12) is confined in the plasma arc (12) and is brought into the melting zone (13) at high temperature and high speed, where the carbon concentration is increased. A highly carburized layer is formed.
ここで、浸炭剤として用いる炭素化合物としてはＳｉＣ
、ＣｒｎＣｍ 、 ＭｏＣ等が上げられ、また、グラフ
ァイト粉末、炭素化合物粉末の粒径は緻密な浸炭組織を
形成する上で５０１Ｌ以下とするのが望ましい、更にグ
ラファイト粉末の溶融部への混入を容易にするには各グ
ラファイト粒子にＣｕ又はＮｉメッキを施したものを用
いればよい。Here, the carbon compound used as the carburizing agent is SiC
, CrnCm, MoC, etc., and the particle size of graphite powder and carbon compound powder is preferably 501L or less in order to form a dense carburized structure. In order to do this, each graphite particle may be plated with Cu or Ni.
第２図は本発明方法によって得られた鋼材の浸炭組織を
５０倍に拡大したＩ１１微鏡写真であり、この写真にお
いて、右側の黒色がかった部分が母材部分で、中央の白
色がかった部分がチル化組織の部分であり、このチル化
組織の部分は溶融の際にグラファイト等を供給して高炭
素濃度とした後。Figure 2 is an I11 microphotograph magnifying 50 times the carburized structure of the steel material obtained by the method of the present invention. In this photo, the blackish part on the right is the base metal part, and the whiteish part in the center. is the part of the chilled structure, and this part of the chilled structure has been made to have a high carbon concentration by supplying graphite etc. during melting.
冷却して形成したものである。この写真から分るように
本発明方法によれば、深さが均一で緻密な組織を形成す
ることができる。It is formed by cooling. As can be seen from this photograph, according to the method of the present invention, a dense structure with uniform depth can be formed.
（発明の効果）
以上の説明で明らかな如く、本発明によれば、鋼材に前
処理を施すことなく鋼材の一部に浸炭処理を施すことが
でき、更にプラズマアーク中にメタンガス等の炭化水素
ガスを供給する方法に比べ、炭素濃度を高くすることが
できるため、耐摩耗性等の特性に優れたレデブライトを
形成することができ、更に浸炭組織の深さ調整も極めて
容易に行える等多くの効果を発揮する。(Effects of the Invention) As is clear from the above explanation, according to the present invention, it is possible to carburize a part of the steel material without pre-treating the steel material, and furthermore, it is possible to carburize a part of the steel material without pre-treating the steel material, and furthermore, it is possible to carburize a part of the steel material without pre-treating the steel material. Compared to the method of supplying gas, it is possible to increase the carbon concentration, so it is possible to form leadebrite with excellent properties such as wear resistance, and it is also extremely easy to adjust the depth of the carburized structure. be effective.
第１図は本発明方法の実施例に使用するプラズマトーチ
の一部切欠断面図、第２図は本発明方法によって得られ
た鋼材の浸炭部分の金属組織を示す顕微鏡写真である。
尚、図面中（りはプラズマトーチ、（３）はノズルチッ
プ、（７）はタングステン電極、（１０）は粉未導入管
、（１１）は鋼材、（１２）はプラズマアーク。
（１３）は溶融部、（１４）は粉末材である。
特許出願人 本田技研工業株式会社
代理人 弁理士 下 １） 容一部間 弁理士
大 橋 邦 部同 弁理士 小
山 有第１図FIG. 1 is a partially cutaway sectional view of a plasma torch used in an example of the method of the present invention, and FIG. 2 is a micrograph showing the metal structure of a carburized portion of a steel material obtained by the method of the present invention. In the drawings, (ri) shows a plasma torch, (3) shows a nozzle tip, (7) shows a tungsten electrode, (10) shows a tube with no powder introduced, (11) shows a steel material, (12) shows a plasma arc, and (13) shows a plasma arc. The molten part (14) is a powder material. Patent applicant: Honda Motor Co., Ltd. Agent, Patent Attorney, Part 2 1) Part: Patent attorney: Kuni Ohashi, Patent attorney, Department: Yu Koyama Figure 1
Claims (2)
アークにて溶融せしめ、この溶融部にプラズマトーチに
付設した粉未導入管からグラファイト粉末或いは炭素化
合物粉末を供給し、溶融部の炭素濃度を高めるようにし
たことを特徴とする鋼の浸炭方法。(1) The surface of the steel material is melted by a plasma arc ejected from a plasma torch, and graphite powder or carbon compound powder is supplied to the melted part from a powder-free tube attached to the plasma torch to increase the carbon concentration in the melted part. A steel carburizing method characterized by:
メッキが施されていることを特徴とする特許請求の範囲
第１項記載の鋼の浸炭方法。(2) The graphite powder has Cu or Ni on its surface.
The method for carburizing steel according to claim 1, wherein the steel is plated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59119483A JPS61572A (en) | 1984-06-11 | 1984-06-11 | Cementing method of steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59119483A JPS61572A (en) | 1984-06-11 | 1984-06-11 | Cementing method of steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61572A true JPS61572A (en) | 1986-01-06 |
| JPS625227B2 JPS625227B2 (en) | 1987-02-03 |
Family
ID=14762397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59119483A Granted JPS61572A (en) | 1984-06-11 | 1984-06-11 | Cementing method of steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61572A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004076709A1 (en) * | 2003-02-27 | 2004-09-10 | Yoshino Hard Inc. | Iron-based parts and method for manufacture thereof |
| JP2010001508A (en) * | 2008-06-18 | 2010-01-07 | Toyota Central R&D Labs Inc | Carburization heat treatment method and carburization source material |
| JP2019157143A (en) * | 2018-03-07 | 2019-09-19 | トヨタ紡織株式会社 | Manufacturing method of locally strengthened component, and locally strengthened component |
-
1984
- 1984-06-11 JP JP59119483A patent/JPS61572A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004076709A1 (en) * | 2003-02-27 | 2004-09-10 | Yoshino Hard Inc. | Iron-based parts and method for manufacture thereof |
| JP2010001508A (en) * | 2008-06-18 | 2010-01-07 | Toyota Central R&D Labs Inc | Carburization heat treatment method and carburization source material |
| JP2019157143A (en) * | 2018-03-07 | 2019-09-19 | トヨタ紡織株式会社 | Manufacturing method of locally strengthened component, and locally strengthened component |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS625227B2 (en) | 1987-02-03 |
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