JP3184295B2 - Manufacturing method of carburized member - Google Patents
Manufacturing method of carburized memberInfo
- Publication number
- JP3184295B2 JP3184295B2 JP12452792A JP12452792A JP3184295B2 JP 3184295 B2 JP3184295 B2 JP 3184295B2 JP 12452792 A JP12452792 A JP 12452792A JP 12452792 A JP12452792 A JP 12452792A JP 3184295 B2 JP3184295 B2 JP 3184295B2
- Authority
- JP
- Japan
- Prior art keywords
- carburized
- carburizing
- gear
- quenching
- correction processing
- 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 - Fee Related
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、浸炭歯車等の浸炭部材
を製造する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a carburized member such as a carburized gear.
【０００２】[0002]
【従来の技術】浸炭部材は、浸炭処理により表面が硬化
された部材であり、その製造は、例えば特開昭62-70557
号公報に開示されているように、一般に次のようにして
行われている。すなわち、浸炭歯車を例にとると、図１
(b)に示すように、まず、ホブ切り等により歯車創成を
行い、次に、歯面を修正する修正加工（シェービング）
を行い、最後に、浸炭焼入れ（すなわち浸炭雰囲気中で
の加熱および急冷）を行うようになっている。2. Description of the Related Art A carburized member is a member whose surface is hardened by a carburizing treatment.
As disclosed in Japanese Patent Application Laid-Open Publication No. H10-209, generally, this is performed as follows. That is, taking a carburized gear as an example, FIG.
As shown in (b), first, a gear is created by hobbing, etc., and then a correction processing (shaving) to correct the tooth surface
And finally, carburizing and quenching (that is, heating and quenching in a carburizing atmosphere).
【０００３】上記修正加工工程においては、浸炭焼入れ
の際の加熱による変形量を予め見込んでおき、浸炭焼入
れ前に上記見込み変形量に基づいて歯形、歯筋を修正す
るようになっている。In the above-mentioned correction processing step, an amount of deformation due to heating at the time of carburizing and quenching is estimated in advance, and the tooth shape and tooth trace are corrected based on the expected amount of deformation before carburizing and quenching.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来の浸炭歯車の製造方法においては、修正加工後の浸炭
焼入れによる変形量のバラツキが大きいため、狙いとす
る歯車精度が得にくい、という問題があった。これは加
熱による残留応力（ホブ切り時の加工応力）の解放やク
リープ（自重によるダレ）の発生と焼入れ時の変態応力
（マルテンサイト変態により生じる応力）や熱応力の不
均一な発生とによるものである。However, the conventional method for manufacturing a carburized gear described above has a problem in that the target gear accuracy is difficult to obtain because the variation in the amount of deformation due to carburizing and quenching after the correction processing is large. Was. This is due to the release of residual stress (working stress during hobbing) due to heating, the generation of creep (sagging due to its own weight), the transformation stress during quenching (the stress caused by martensitic transformation), and the uneven generation of thermal stress. It is.
【０００５】このような問題は、浸炭歯車のみならず他
の浸炭部材を製造する場合にも生じる問題である。[0005] Such a problem is a problem that occurs not only when carburized gears but also other carburized members are manufactured.
【０００６】本発明は、このような事情に鑑みてなされ
たものであって、寸法精度の高い浸炭部材を容易に製造
することができる浸炭部材の製造方法を提供することを
目的とするものである。The present invention has been made in view of such circumstances, and has as its object to provide a method of manufacturing a carburized member that can easily manufacture a carburized member having high dimensional accuracy. is there.
【０００７】[0007]
【課題を解決するための手段】本発明に係る浸炭部材の
製造方法は、従来のように修正加工後に浸炭焼入れを行
うのではなく、この浸炭焼入れを浸炭処理と焼入れ処理
とに分け、高温での加熱を必要とする浸炭処理は修正加
工前に行うようにすることにより、残留応力が解放され
かつクリープが発生した後の部材に対して修正加工を施
すことができるようにし、また、部材を硬化させる焼入
れ処理は修正加工後に行うようにすることにより、修正
加工を容易に行うことができるようにし、もって上記目
的達成を図るようにしたものである。According to the method of manufacturing a carburized member according to the present invention, instead of performing carburizing and quenching after correction processing as in the prior art, this carburizing and quenching is divided into a carburizing treatment and a quenching treatment. By performing the carburizing treatment that requires heating before the repair processing, the residual stress is released and the member after the creep has occurred can be subjected to the repair processing, and The quenching treatment for hardening is performed after the correction processing, so that the correction processing can be easily performed, thereby achieving the above object.
【０００８】すなわち、請求項１に記載したように、鋼
材を所定形状に加工して中間工程部材を作製し、その
後、この中間工程部材を加熱して浸炭処理を施し、その
後、この中間工程部材を徐冷する際、脱炭処理を施し、
その後、この中間工程部材の形状を修正する修正加工を
施し、その後、この中間工程部材を前記浸炭処理時の加
熱温度よりも低い温度で再加熱して焼入れする、ことを
特徴とするものである。That is, as described in claim 1, an intermediate member is manufactured by processing a steel material into a predetermined shape, and then the intermediate member is heated and carburized. a time of slow cooling, and facilities decarburization treatment,
Thereafter, a correction process for correcting the shape of the intermediate process member is performed, and thereafter, the intermediate process member is subjected to processing during the carburizing process.
It is characterized by reheating and quenching at a temperature lower than the heat temperature .
【０００９】[0009]
【発明の作用および効果】上記構成に示すように、高温
での加熱を必要とする浸炭処理は修正加工前に行われる
ようになっているので、残留応力が解放されかつクリー
プが発生した後の中間工程部材に対して修正加工を施す
ことができ、また、中間工程部材を硬化させる焼入れ処
理は修正加工後に行われるようになっているので、修正
加工を容易に行うことができる。As described above, the carburizing treatment requiring heating at a high temperature is performed before the correction processing, so that the residual stress is released and after the creep occurs. Correction processing can be performed on the intermediate process member, and the quenching process for hardening the intermediate process member is performed after the correction processing, so that the correction processing can be easily performed.
【００１０】なお、上記浸炭処理の際の冷却は、急冷
（焼入れ）ではなく、徐冷（焼なまし）で行われるよう
になっているので、この冷却により中間工程部材が硬化
して修正加工が困難になってしまうことはない。Since the cooling during the carburizing treatment is performed not by rapid cooling (quenching) but by slow cooling (annealing), the intermediate process member is hardened by this cooling, and correction processing is performed. Is not difficult.
【００１１】このように、本発明によれば、寸法精度の
高い浸炭部材を容易に製造することができる。As described above, according to the present invention, a carburized member having high dimensional accuracy can be easily manufactured.
【００１２】上記浸炭処理時の加熱により加工時の残留
応力が解放されるので、修正加工後の再加熱の際に、こ
の残留応力解放の問題が生じることはないが、再加熱時
の加熱温度は、浸炭処理後の加熱温度よりも低い温度に
設定することが、クリープや熱応力等の発生を抑制する
上で好ましい。[0012] Since the residual stress at the time of processing by heating during the carburization process is released, upon re-heating after the correction processing, this residual stress release problems never occur, the heating temperature during the reheating Is preferably set to a temperature lower than the heating temperature after the carburizing treatment in order to suppress the occurrence of creep, thermal stress and the like.
【００１３】また、浸炭処理後の徐冷の際、中間工程部
材に脱炭処理を施すようにすれば、中間工程部材の表層
領域を軟化させることができ、これにより、その後の修
正加工を一層容易に行うことができる。 Further, during the slow cooling after the carburizing treatment, if such a decarburization treatment in an intermediate step member subjected, it is possible to soften the surface layer region of the intermediate step member, thereby, the subsequent correction processing It can be done more easily.
【００１４】さらに、このようにした場合には、請求項
２に記載したように、再加熱の際、中間工程部材に浸炭
処理を施すようにすれば、脱炭処理によって失われた浸
炭層表層部分を再び浸炭層として回復せしめることがで
きる。Further, in such a case, the claims
As described in 2 , when carburizing is performed on the intermediate process member at the time of reheating, the surface layer portion of the carburized layer lost by the decarburizing process can be recovered as a carburized layer again.
【００１５】[0015]
【実施例】以下、添付図面を参照しながら、本発明の実
施例について説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００１６】図１は、本発明に係る浸炭部材の製造方法
の一実施例を示す工程図であって、本実施例（同図(a))
を従来例（同図(b))と対比して示す図である。FIG. 1 is a process diagram showing one embodiment of a method for manufacturing a carburized member according to the present invention.
FIG. 3 is a diagram showing a comparison with a conventional example (FIG. 2B).
【００１７】本実施例は、浸炭歯車の製造方法であっ
て、その製造工程順に説明すると以下のとおりである。The present embodiment relates to a method for manufacturing a carburized gear, which will be described below in the order of the manufacturing steps.
【００１８】まず、工程Iで、歯車用素材（鋼材）に対
してホブ切りによる歯車創成加工を施し、これにより中
間工程歯車を作製する。First, in a step I, a gear material (steel material) is subjected to hobbing to create a gear, thereby producing an intermediate process gear.
【００１９】次に、工程IIでこの中間工程歯車に対して
浸炭および徐冷を行う。浸炭処理は通常浸炭によって行
われ、また徐冷の際には脱炭処理を行うようになってい
る。すなわち、図２に示すように、中間工程歯車を加熱
して900〜950℃の浸炭雰囲気（ＣＯ）中で所定時間（１
〜３時間）保持した後、徐冷（炉冷）を行う。徐冷途中
で、所定時間一定温度にして、中間工程歯車を脱炭雰囲
気（Ｈ2Ｏ（0.05％以上））中に保持する。Next, in step II, the intermediate step gear is carburized and gradually cooled. Carburizing is usually performed by carburizing, and decarburizing is performed during slow cooling. That is, as shown in FIG. 2, the intermediate process gear is heated to a predetermined time (1 ° C.) in a carburizing atmosphere (CO) at 900 to 950 ° C.
After holding for about 3 hours, slow cooling (furnace cooling) is performed. During the slow cooling, the intermediate process gear is kept at a constant temperature for a predetermined time and kept in a decarburized atmosphere (H 2 O (0.05% or more)).
【００２０】上記浸炭処理により、中間工程歯車の表面
部に深さ約１ｍｍの浸炭層が形成される。この浸炭層
は、図３に実線で示すように、最表面から深くなるに従
って炭素濃度が低下する。具体的には、最表面において
炭素濃度約0.8％、深さ１ｍｍの部分において炭素濃度
約0.2％である。また、図３に破線で示すように、上記
脱炭処理により、浸炭層の最表面から30〜100μｍの深
さにわたって炭素濃度が急激に低下する。By the carburizing treatment, a carburized layer having a depth of about 1 mm is formed on the surface of the intermediate gear. As shown by the solid line in FIG. 3, the carbon concentration of the carburized layer decreases as the depth from the outermost surface increases. Specifically, the carbon concentration is about 0.8% at the outermost surface, and about 0.2% at the portion with a depth of 1 mm. Further, as shown by the broken line in FIG. 3, the carbon concentration sharply decreases over the depth of 30 to 100 μm from the outermost surface of the carburized layer due to the decarburization treatment.
【００２１】上記浸炭処理の際の加熱により、ホブ切り
の際に生じた加工応力（残留応力）が解放され、またク
リープによる変形が発生する。また、浸炭処理により形
成された浸炭層によって中間工程歯車の表面はある程度
強化されるが、その後急冷ではなく徐冷による冷却がな
されるので、従来のような浸炭焼入れを行ったときのよ
うに後のシェービングが困難になるほど硬化してしまう
ことはない。さらに、上記徐冷の際の脱炭処理により浸
炭層の最表面部が軟化するので、後のシェービングが一
層容易となる。By the heating during the carburizing treatment, the processing stress (residual stress) generated at the time of hobbing is released, and deformation due to creep occurs. In addition, the surface of the intermediate process gear is strengthened to some extent by the carburized layer formed by the carburizing process, but then the cooling is performed by slow cooling instead of quenching. Does not harden to the extent that shaving becomes difficult. Furthermore, since the outermost surface portion of the carburized layer is softened by the decarburizing treatment at the time of the above-described slow cooling, the shaving after that becomes easier.
【００２２】次に、工程IIIで、中間工程歯車に対して
シェービング加工を施し、歯面の変形修正および仕上げ
を行う。このシェービング加工の際には、すでに中間工
程歯車からホブ切り時の加工応力が解放されており、ま
たクリープによる変形も完了しているので、精度よくシ
ェービングを行うことができる。また、シェービング加
工が必要となる中間工程歯車の表層領域は脱炭層となっ
ているため、シェービングを容易に行うことができるの
みならず、シェービング刃物の寿命を延ばすことができ
る。Next, in step III, the intermediate step gear is subjected to shaving to correct the deformation and finish of the tooth surface. At the time of this shaving processing, the processing stress at the time of hobbing has already been released from the intermediate step gear, and the deformation due to creep has been completed, so that shaving can be performed with high accuracy. In addition, since the surface region of the intermediate step gear requiring shaving is a decarburized layer, not only can shaving be performed easily, but also the life of the shaving blade can be extended.
【００２３】次に工程IVで、中間工程歯車を再加熱して
焼入れし、さらにこれを焼戻しする。上記焼入れは、す
でにシェービング加工が終った中間工程歯車の硬度を高
めるために行われるものであるが、この焼入れのための
再加熱により新たなクリープが発生してしまうのを防止
するため、加熱温度は、工程IIの浸炭処理の際の加熱温
度（900〜950℃）に対して低い温度（800〜900℃）に設
定されている。また、シェービング加工容易化のため
に、浸炭層の最表面部が脱炭されているので、シェービ
ング加工後に残った脱炭層の復炭を図るべく、上記再加
熱は浸炭雰囲気中で上記加熱温度（800〜900℃）に所定
時間（15〜60分）保持される。なお、この場合、浸炭雰
囲気として浸炭窒化雰囲気を採用するようにしてもよ
い。焼戻しは、中間工程歯車にねばり強さを与えるため
に行われる通常の焼戻しである。Next, in step IV, the intermediate step gear is reheated and quenched, and further tempered. The above-mentioned quenching is performed in order to increase the hardness of the intermediate process gear which has already been subjected to the shaving process, but in order to prevent new creep from being generated by reheating for this quenching, the heating temperature is increased. Is set to a temperature (800 to 900 ° C.) lower than the heating temperature (900 to 950 ° C.) in the carburizing treatment in the step II. Further, since the outermost surface of the carburized layer is decarburized to facilitate the shaving process, the reheating is performed in a carburizing atmosphere at the heating temperature ( (800 to 900 ° C) for a predetermined time (15 to 60 minutes). In this case, a carbonitriding atmosphere may be adopted as the carburizing atmosphere. Tempering is a normal tempering performed to impart tenacity to the intermediate process gear.
【００２４】以上詳述したように、本実施例において
は、高温での加熱を必要とする浸炭処理が修正加工前に
行われるようになっているので、残留応力が解放されか
つクリープが発生した後の中間工程歯車に対して修正加
工を施すことができ、また、中間工程歯車を硬化させる
焼入れは修正加工後に行われるようになっているので、
修正加工を容易に行うことができる。なお、上記浸炭処
理の際の冷却は、急冷（焼入れ）ではなく、徐冷（焼な
まし）で行われるようになっているので、この冷却によ
り中間工程歯車が硬化して修正加工が困難になってしま
うことはない。As described above in detail, in this embodiment, since the carburizing treatment requiring heating at a high temperature is performed before the correction processing, the residual stress is released and the creep occurs. Correction processing can be performed on the subsequent intermediate process gear, and quenching for hardening the intermediate process gear is performed after the correction processing,
Correction processing can be easily performed. In addition, since the cooling at the time of the carburizing treatment is performed not by quenching (quenching) but by gradual cooling (annealing), the intermediate process gear hardens due to this cooling, and correction processing becomes difficult. It will not be.
【００２５】このように、本実施例によれば、寸法精度
の高い浸炭部材を容易に製造することができる。As described above, according to the present embodiment, a carburized member having high dimensional accuracy can be easily manufactured.
【００２６】また、本実施例においては、浸炭処理後の
再加熱時の加熱温度が、浸炭処理時の加熱温度よりも低
い温度に設定されるので、再加熱によるクリープや熱応
力等の発生を抑制することができる。Further, in this embodiment, since the heating temperature at the time of reheating after the carburizing treatment is set to a temperature lower than the heating temperature at the time of the carburizing treatment, the occurrence of creep and thermal stress due to the reheating is prevented. Can be suppressed.
【００２７】さらに、本実施例においては、浸炭処理後
の徐冷の際、中間工程歯車に脱炭処理を施すようになっ
ているので、その後の修正加工を一層容易に行うことが
できる。しかもこの場合、再加熱の際、中間工程歯車に
浸炭処理を施すようになっているので、脱炭処理によっ
て失われた浸炭層表層部分を再び浸炭層として回復せし
めることができる。Further, in the present embodiment, during slow cooling after the carburizing treatment, the intermediate step gear is subjected to the decarburizing treatment, so that the subsequent correction processing can be performed more easily. In addition, in this case, the carburizing process is performed on the intermediate step gear during reheating, so that the surface layer portion of the carburized layer lost by the decarburizing process can be recovered as the carburized layer again.
【図１】本発明に係る浸炭部材の製造方法の一実施例を
示す工程図であって、本実施例（同図(a))を従来例（同
図(b))と対比して示す図FIG. 1 is a process diagram showing one embodiment of a method for manufacturing a carburized member according to the present invention, in which the present embodiment (FIG. 1 (a)) is shown in comparison with a conventional example (FIG. 1 (b)). Figure
【図２】上記実施例の作用を示すグラフFIG. 2 is a graph showing the operation of the embodiment.
【図３】上記実施例の作用を示すグラフFIG. 3 is a graph showing the operation of the embodiment.
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C21D 9/00 - 9/44 C21D 9/50 C23C 8/22 C23C 8/80 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) C21D 9/00-9/44 C21D 9/50 C23C 8/22 C23C 8/80
Claims (2)
を作製し、その後、この中間工程部材を加熱して浸炭処
理を施し、その後、この中間工程部材を徐冷する際、脱
炭処理を施し、その後、この中間工程部材の形状を修正
する修正加工を施し、その後、この中間工程部材を前記
浸炭処理時の加熱温度よりも低い温度で再加熱して焼入
れする、ことを特徴とする浸炭部材の製造方法。 1. An intermediate process member is manufactured by processing a steel material into a predetermined shape, and thereafter, the intermediate process member is heated and carburized, and then, when the intermediate process member is gradually cooled ,
Charcoal treated facilities, then subjected to correction processing for correcting the shape of the intermediate step member, then the this intermediate step member
A method for producing a carburized member, characterized by reheating and quenching at a temperature lower than the heating temperature during carburizing .
炭処理を施す、ことを特徴とする請求項１記載の浸炭部
材の製造方法。Wherein during said reheating, the intermediate step member carburized method of carburizing member according to claim 1, wherein a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12452792A JP3184295B2 (en) | 1992-05-18 | 1992-05-18 | Manufacturing method of carburized member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12452792A JP3184295B2 (en) | 1992-05-18 | 1992-05-18 | Manufacturing method of carburized member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05320765A JPH05320765A (en) | 1993-12-03 |
| JP3184295B2 true JP3184295B2 (en) | 2001-07-09 |
Family
ID=14887691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12452792A Expired - Fee Related JP3184295B2 (en) | 1992-05-18 | 1992-05-18 | Manufacturing method of carburized member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3184295B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE0002448D0 (en) * | 2000-06-28 | 2000-06-28 | Hoeganaes Ab | method of producing powder metal components |
| JP4712603B2 (en) * | 2006-04-28 | 2011-06-29 | Ｎｔｎ株式会社 | Rolling part manufacturing method, race ring and bearing |
-
1992
- 1992-05-18 JP JP12452792A patent/JP3184295B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05320765A (en) | 1993-12-03 |
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