JPH08295925A - High frequency heating method and apparatus thereof - Google Patents
High frequency heating method and apparatus thereofInfo
- Publication number
- JPH08295925A JPH08295925A JP7100912A JP10091295A JPH08295925A JP H08295925 A JPH08295925 A JP H08295925A JP 7100912 A JP7100912 A JP 7100912A JP 10091295 A JP10091295 A JP 10091295A JP H08295925 A JPH08295925 A JP H08295925A
- Authority
- JP
- Japan
- Prior art keywords
- work
- heating
- gear
- high frequency
- electromagnetic wave
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、炭素鋼からなるワーク
を高周波焼入れする場合の高周波加熱方法およびその装
置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating method and apparatus for induction hardening a work made of carbon steel.
【０００２】[0002]
【従来の技術】従来より、炭素鋼からなる歯車の歯およ
び歯底を高周波焼入れする場合には、図４に示すよう
に、回転治具１および押さえ治具２よりなるワーク支持
治具に歯車３を装着支持させ、この歯車３の外周に沿っ
て配設した加熱コイル４に高周波電流を通じて歯車３の
歯および歯底を誘導加熱し、加熱終了後、歯車３を冷媒
浴中に浸漬する等により急冷して焼入れするのが一般的
であった。2. Description of the Related Art Conventionally, in the case of induction hardening the teeth and the bottom of a gear made of carbon steel, as shown in FIG. 4, a gear is attached to a work supporting jig consisting of a rotating jig 1 and a holding jig 2. 3 is mounted and supported, and the teeth and the bottom of the gear 3 are induction-heated by passing a high-frequency current through a heating coil 4 arranged along the outer periphery of the gear 3, and after the heating is finished, the gear 3 is immersed in a coolant bath, etc. It was common to quench and quench by.
【０００３】すなわち、ワークの浸炭処理後、高周波加
熱・焼入れを行なうことにより、歯車３の表面組織のオ
ーステナイト結晶粒を微細化して、歯車３の衝撃強度を
向上させるが、高周波加熱時の加熱温度が高過ぎるとオ
ーステナイト結晶粒が粗大化して歯車３の強度が低下す
るから、オーステナイト結晶粒の粗大化を阻止するため
には、この高周波加熱の目標温度の上限を９００°Ｃ以
下とする必要がある。また、ワーク全体を焼入れ組織と
するためには、図５に示す鋼の変態図におけるオーステ
ナイト化温度（亜共析鋼ではＡｃ3 線上の温度、過共析
鋼ではＡｃcm線上の温度。炭素濃度１．０％で約８００
°Ｃ、炭素濃度１．２％で約８５０°Ｃ）以上を目標温
度の下限としなければならない。That is, after carburizing the work, high-frequency heating / quenching is performed to refine the austenite crystal grains in the surface structure of the gear 3 to improve the impact strength of the gear 3. Is too high, the austenite crystal grains are coarsened and the strength of the gear 3 is lowered. Therefore, in order to prevent the austenite crystal grains from being coarsened, the upper limit of the target temperature of the high frequency heating needs to be 900 ° C. or less. is there. Further, in order to make the entire work into a quenched structure, the austenitizing temperature (the temperature on the Ac 3 line for hypoeutectoid steel, the temperature on the Ac cm line for hypereutectoid steel. 800% at 1.0%
The target temperature must be lower than about 850 ° C with a carbon concentration of 1.2%.
【０００４】しかしながら、歯車３の外周に沿って配設
した加熱コイル４によって高周波加熱を行なった場合、
エッジ効果のために歯底のエッジ部５が図６に示すよう
に過熱されて、オーステナイト結晶粒が粗大化すること
から、破壊起点部となるエッジ部５が強度が低下してし
まう欠点があった。However, when high frequency heating is performed by the heating coil 4 arranged along the outer periphery of the gear 3,
Since the edge portion 5 of the tooth bottom is overheated due to the edge effect as shown in FIG. 6 and the austenite crystal grains are coarsened, there is a drawback that the edge portion 5 serving as a fracture starting point has a reduced strength. It was
【０００５】そこで、特開昭５５−１１３８３６号公報
に開示された「歯車の高周波表面焼入法」では、歯車の
胴輪の上下表面を、歯底の上下エッジ部の近傍まで熱伝
導性のよい被覆材で被覆して、高周波加熱時のエッジ部
の温度上昇を防止している。Therefore, in the "induction surface quenching method for gears" disclosed in Japanese Patent Laid-Open No. 55-113836, thermal conductivity of the upper and lower surfaces of the body ring of the gear is extended to the vicinity of the upper and lower edge portions of the tooth bottom. It is coated with a good coating material to prevent the temperature rise of the edge portion during high frequency heating.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記方
法では、歯車の外形形状に応じた被覆材を必要とし、か
つ、高周波加熱に際して歯車の要部を被覆材で覆わなけ
ればならない手間を要するのみでなく、歯車の種類によ
っては、被覆材による被覆が困難となる場合があった。However, the above method requires a coating material corresponding to the outer shape of the gear and requires only time and effort to cover the main part of the gear with high frequency heating. However, depending on the type of gear, the coating with the coating material may be difficult.
【０００７】また、特に高周波焼入れを施すべきワーク
が、例えば自動車の差動装置のサイドギヤのように、軸
孔の内周壁にスプラインが形成されているような場合、
そのスプライン部分にも焼入れを施す必要があるため、
ワークの芯部の温度も上記オーステナイト化温度以上の
温度になるように高周波加熱を行なわなければならない
ことから、ワークの外周側の歯部は９００°Ｃを超える
高温となり、オーステナイト結晶粒が粗大化して、強度
が低下してしまう欠点があった。Further, when the work to be induction hardened has a spline formed on the inner peripheral wall of the shaft hole, such as a side gear of a differential of an automobile,
Since it is necessary to quench the spline part,
Since the high-frequency heating must be performed so that the temperature of the core of the work becomes higher than the above austenitizing temperature, the teeth on the outer peripheral side of the work reach a high temperature of over 900 ° C and the austenite crystal grains become coarse. Therefore, there is a drawback that the strength is lowered.
【０００８】上述の事情に鑑み、本発明の第１の目的
は、被覆材を用いることなく高周波加熱時のワークのエ
ッジ部の温度上昇を防止することができる高周波加熱方
法およびその装置を提供することにある。In view of the above circumstances, a first object of the present invention is to provide a high frequency heating method and apparatus capable of preventing the temperature rise of the edge portion of a work during high frequency heating without using a covering material. Especially.
【０００９】本発明の第２の目的は、ワークの芯部を上
記目標温度の上下限の間の温度に保ちながら、ワークの
表面温度を目標温度の上限以下に保つことができる高周
波加熱方法およびその装置を提供することにある。A second object of the present invention is to provide a high-frequency heating method capable of keeping the surface temperature of a work below the upper limit of the target temperature while keeping the core of the work at a temperature between the upper and lower limits of the target temperature. To provide the device.
【００１０】[0010]
【課題を解決するための手段】上記第１の目的を達成す
るために、本発明による高周波加熱方法は、ワークの周
辺に電磁波吸収部材を配設してワークを高周波誘導加熱
することを特徴とするものである。この電磁波吸収部材
としては、例えば純鉄のような透磁率の比較的低い材料
を用いることができる。In order to achieve the above-mentioned first object, the high frequency heating method according to the present invention is characterized in that an electromagnetic wave absorbing member is arranged around the work and the work is subjected to high frequency induction heating. To do. As the electromagnetic wave absorbing member, for example, a material having a relatively low magnetic permeability such as pure iron can be used.
【００１１】上記第２の目的を達成するために、ワーク
の周辺に電磁波吸収部材を配設してワークを高周波誘導
加熱するに際し、この加熱の途中でワークの表面に冷媒
を供給して該表面を冷却することが好ましい。In order to achieve the second object, when an electromagnetic wave absorbing member is arranged around the work to heat the work by high frequency induction heating, a coolant is supplied to the surface of the work in the middle of the heating. Is preferably cooled.
【００１２】その場合に、冷媒によりワークの表面を共
析点温度（７２３°Ｃ、図５参照）未満に冷却した後、
冷媒の供給を停止してワークの表面をオーステナイト化
温度以上に再加熱することが好ましい。In this case, after cooling the surface of the work to a temperature below the eutectoid point (723 ° C., see FIG. 5) with a refrigerant,
It is preferable to stop the supply of the refrigerant and reheat the surface of the work to the austenitizing temperature or higher.
【００１３】この再加熱時には上記電磁波吸収部材をワ
ークの周辺から除去することが好ましい。At the time of this reheating, it is preferable to remove the electromagnetic wave absorbing member from the periphery of the work.
【００１４】また、上記第１の目的を達成するために、
本発明による高周波加熱装置は、ワークの周辺に電磁波
吸収部材が配設されてなることを特徴とするものであ
る。この電磁波吸収部材の内部に、冷却水通路を設ける
ことが好ましい。In order to achieve the above first object,
The high-frequency heating device according to the present invention is characterized in that an electromagnetic wave absorbing member is arranged around the work. It is preferable to provide a cooling water passage inside the electromagnetic wave absorbing member.
【００１５】さらに、上記第２の目的を達成するため
に、本発明による高周波加熱装置は、ワークの周辺に電
磁波吸収部材が配設された構成に加えて、加熱の途中で
ワークの表面に冷媒を供給して該表面を冷却する冷媒供
給手段を備えていることが好ましい。Further, in order to achieve the above-mentioned second object, in the high frequency heating apparatus according to the present invention, in addition to the construction in which the electromagnetic wave absorbing member is arranged around the work, a refrigerant is provided on the surface of the work during heating. It is preferable to provide a coolant supply means for supplying the liquid to cool the surface.
【００１６】[0016]
【発明の作用および効果】本発明による高周波加熱方法
およびその装置では、ワークの周辺に電磁波吸収部材を
配設して高周波誘導加熱を行なうことにより、ワークの
エッジ部付近の電磁束密度を低減することができ、エッ
ジ部の温度が目標温度の上限以上に上昇するのが阻止さ
れるから、オーステナイト結晶粒の粗大化による衝撃強
度の低下を防止することができる。In the high frequency heating method and apparatus according to the present invention, the electromagnetic flux density near the edge of the work is reduced by disposing an electromagnetic wave absorbing member around the work for high frequency induction heating. It is possible to prevent the temperature of the edge portion from rising above the upper limit of the target temperature, so that it is possible to prevent the impact strength from being lowered due to the coarsening of the austenite crystal grains.
【００１７】この場合、高周波加熱によって、ワーク芯
部まで焼入れして硬度を高めようとすると、ワークの表
面が比較的長時間高温（９００°以上）となり、オース
テナイト結晶粒の成長が進み過ぎて、靭性が低下する
が、途中でワークの表面に冷媒を供給して表面を共析点
温度（７２３°Ｃ）未満に冷却した後、再度ワーク表面
をオーステナイト化温度以上に加熱することにより、芯
部の温度をオーステナイト化温度以上に保ちながら、ワ
ーク表面が長時間高温になるのを防止することができ
る。In this case, if the work core is hardened by high frequency heating to increase the hardness, the work surface becomes a high temperature (900 ° or more) for a relatively long time, and the growth of austenite crystal grains proceeds too much, Although the toughness is reduced, a coolant is supplied to the surface of the work in the middle to cool the surface to a temperature lower than the eutectoid temperature (723 ° C), and then the work surface is heated again to the austenitizing temperature or higher, thereby It is possible to prevent the surface of the work from becoming high temperature for a long time while maintaining the temperature of 1 above the austenitizing temperature.
【００１８】そして、図５から明らかなように、亜共析
鋼の場合、再加熱温度がＡｃ3 線上の温度未満ではフェ
ライトが析出し、過共析鋼の場合、再加熱温度がＡｃcm
線上の温度未満ではセメンタイトが析出して、ともにワ
ークの強度が低下するが、本発明では、ワークの表面を
オーステナイト化温度以上に再加熱しているため、ワー
クの表面のオーステナイト結晶粒の微細化を達成でき、
衝撃強度が向上する効果がある。As is clear from FIG. 5, in the case of hypoeutectoid steel, ferrite precipitates when the reheating temperature is below the temperature on the Ac 3 line, and in the case of hypereutectoid steel, the reheating temperature is Ac cm.
Cementite precipitates below the temperature on the line, and the strength of the work decreases together, but in the present invention, since the surface of the work is reheated to the austenitizing temperature or higher, the austenite crystal grains on the surface of the work are refined. Can be achieved,
It has the effect of improving impact strength.
【００１９】また、電磁波吸収部材の内部に冷却水通路
を設けて、電磁波吸収部材の内部に冷却水を通すことに
より、電磁波吸収部材の発熱を防止することができる。Further, by providing a cooling water passage inside the electromagnetic wave absorbing member and passing the cooling water inside the electromagnetic wave absorbing member, it is possible to prevent heat generation of the electromagnetic wave absorbing member.
【００２０】[0020]
【実施例】図１は本発明による高周波加熱装置の１実施
例を示す部分的断面図で、図４に示す装置と同様に、回
転治具１および押さえ治具２よりなるワーク支持治具
（セラミック製）に歯車３を装着支持させ、この歯車３
の外周に沿って配設した加熱コイル４に高周波電流を通
じて歯車３を誘導加熱するものであるが、図１の装置で
は、環状の電磁波吸収部材６を歯車３のエッジ部５に近
接させて配設してある。この電磁波吸収部材６は、例え
ば純鉄のような透磁率の比較的低い材料で作成される。1 is a partial sectional view showing an embodiment of a high-frequency heating apparatus according to the present invention. Like the apparatus shown in FIG. 4, a work supporting jig (rotating jig 1 and pressing jig 2) Gear 3 is attached to and supported by (ceramic).
Although the gear 3 is induction-heated by applying a high-frequency current to the heating coil 4 arranged along the outer periphery of the gear, in the apparatus of FIG. 1, the annular electromagnetic wave absorbing member 6 is arranged close to the edge portion 5 of the gear 3. It is set up. The electromagnetic wave absorbing member 6 is made of a material having a relatively low magnetic permeability such as pure iron.
【００２１】このような電磁波吸収部材６を歯車３の周
辺に配設して、歯車３の誘導加熱を行なった場合、歯車
３のエッジ部５付近の電磁束密度が低減されるから、図
２に示すように、エッジ部５の温度が目標温度の上限以
上に上昇するのが阻止される。したがって、オーステナ
イト結晶粒の粗大化による衝撃強度の低下を防止するこ
とができる。When such an electromagnetic wave absorbing member 6 is arranged around the gear 3 and induction heating of the gear 3 is performed, the electromagnetic flux density near the edge portion 5 of the gear 3 is reduced. As shown in, the temperature of the edge portion 5 is prevented from rising above the upper limit of the target temperature. Therefore, it is possible to prevent the impact strength from decreasing due to the coarsening of the austenite crystal grains.
【００２２】この場合、電磁波吸収部材６も高周波加熱
されて多少発熱するから、内部に冷却水通路を設けて、
この通路に常に冷却水を流すことが好ましい。In this case, since the electromagnetic wave absorbing member 6 is also heated by high frequency and generates a little heat, a cooling water passage is provided inside,
It is preferable that the cooling water always flows through this passage.
【００２３】また、歯車３の周囲に冷却用ガスの噴射ノ
ズル７を設けて、図３に示すように、高周波加熱の途中
で歯車３の表面に冷却用ガスを噴射し、歯車３の表面温
度を一旦共析点温度（２７３°Ｃ）未満の温度、例えば
６００°Ｃまで冷却した後、冷却用ガスの噴射を停止す
るとともに、電磁波吸収部材６を除去して再び高周波加
熱により、歯車３の表面をオーステナイト化温度以上に
急速加熱することが好ましい。Further, a cooling gas injection nozzle 7 is provided around the gear 3 to inject the cooling gas onto the surface of the gear 3 during high frequency heating as shown in FIG. Is once cooled to a temperature lower than the eutectoid temperature (273 ° C.), for example, 600 ° C., then the injection of the cooling gas is stopped, the electromagnetic wave absorbing member 6 is removed, and high frequency heating is performed again to remove the It is preferable to rapidly heat the surface to an austenitizing temperature or higher.
【００２４】このようにすると、歯車３の芯部の温度を
オーステナイト化温度以上に保ちながら、歯車３のエッ
ジ部５が長時間高温になるのを防止することができ、し
かも、エッジ部５を再度オーステナイト化温度以上に加
熱することにより、エッジ部５のオーステナイト結晶粒
の微細化を達成でき、これによって、歯車３の衝撃強度
を向上させることができる。By doing so, it is possible to prevent the edge portion 5 of the gear 3 from becoming high in temperature for a long time while maintaining the temperature of the core portion of the gear 3 at the austenitizing temperature or higher. By heating again to the austenitizing temperature or higher, the austenite crystal grains in the edge portion 5 can be refined, and thereby the impact strength of the gear 3 can be improved.
【図１】本発明による高周波加熱装置の実施例の構成を
示す部分的断面図FIG. 1 is a partial sectional view showing the configuration of an embodiment of a high-frequency heating device according to the present invention.
【図２】本発明による高周波加熱方法の１つの実施態様
を示すグラフFIG. 2 is a graph showing one embodiment of the high-frequency heating method according to the present invention.
【図３】本発明による高周波加熱方法の他の実施態様を
示すグラフFIG. 3 is a graph showing another embodiment of the high frequency heating method according to the present invention.
【図４】従来の高周波加熱装置の構成を示す部分的断面
図FIG. 4 is a partial cross-sectional view showing the configuration of a conventional high-frequency heating device.
【図５】鋼の変態図[Fig. 5] Transformation diagram of steel
【図６】従来の高周波加熱方法の態様を示すグラフFIG. 6 is a graph showing an aspect of a conventional high frequency heating method.
１ 回転治具 ２ 押さえ治具 ３ 歯車 ４ 加熱コイル ５ エッジ部 ６ 電磁波吸収部材 ７ 冷却用ガス噴射ノズル 1 Rotating Jig 2 Holding Jig 3 Gear 4 Heating Coil 5 Edge 6 Electromagnetic Wave Absorbing Member 7 Cooling Gas Injection Nozzle
Claims (7)
際して、該ワークの外周に沿って配設した加熱コイルに
高周波電流を通じて上記ワークを高周波誘導加熱する方
法において、 上記ワークの周辺に電磁波吸収部材を配設して上記ワー
クを高周波誘導加熱することを特徴とする高周波加熱方
法。1. A method for high-frequency induction heating of a work made of carbon steel by applying a high-frequency current to a heating coil arranged along the outer periphery of the work, wherein an electromagnetic wave absorbing member is provided around the work. A high-frequency heating method, which comprises arranging and heating the work by high-frequency induction heating.
媒を供給して該表面を冷却することを特徴とする請求項
１に記載の高周波加熱方法。2. The high-frequency heating method according to claim 1, wherein a coolant is supplied to the surface of the work during the heating to cool the surface.
点温度未満に冷却した後、上記冷媒の供給を停止して上
記ワークの表面をオーステナイト化温度以上に再加熱す
ることを特徴とする請求項２に記載の高周波加熱方法。3. The surface of the work is cooled to a temperature lower than the eutectoid point temperature by the refrigerant, and then the supply of the refrigerant is stopped to reheat the surface of the work to an austenitizing temperature or higher. Item 3. The high frequency heating method according to item 2.
記ワークの周辺から除去することを特徴とする請求項３
に記載の高周波加熱方法。4. The electromagnetic wave absorbing member is removed from the periphery of the work during the reheating.
The high frequency heating method described in.
際して、該ワークの外周に沿って配設した加熱コイルに
高周波電流を通じて上記ワークを高周波誘導加熱する装
置において、 上記ワークの周辺に電磁波吸収部材が配設されてなるこ
とを特徴とする高周波加熱装置。5. An apparatus for high-frequency induction heating of a work made of carbon steel by passing a high-frequency current through a heating coil arranged along the outer periphery of the work, wherein an electromagnetic wave absorbing member is provided around the work. A high-frequency heating device, which is provided.
路が設けられてなることを特徴とする請求項５に記載の
高周波加熱装置。6. The high-frequency heating device according to claim 5, wherein a cooling water passage is provided inside the electromagnetic wave absorbing member.
媒を供給して該表面を冷却する冷媒供給手段を備えてな
ることを特徴とする請求項５または６に記載の高周波加
熱装置。7. The high-frequency heating apparatus according to claim 5, further comprising a coolant supply unit that supplies a coolant to the surface of the work during the heating to cool the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7100912A JPH08295925A (en) | 1995-04-25 | 1995-04-25 | High frequency heating method and apparatus thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7100912A JPH08295925A (en) | 1995-04-25 | 1995-04-25 | High frequency heating method and apparatus thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08295925A true JPH08295925A (en) | 1996-11-12 |
Family
ID=14286558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7100912A Pending JPH08295925A (en) | 1995-04-25 | 1995-04-25 | High frequency heating method and apparatus thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08295925A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008240114A (en) * | 2007-03-28 | 2008-10-09 | High Frequency Heattreat Co Ltd | Restrained quenching apparatus for thin plate member and method therefor |
| CN103526006A (en) * | 2013-09-26 | 2014-01-22 | 北京北方车辆集团有限公司 | High-frequency induction heating and heat processing technology of duplicate gear |
-
1995
- 1995-04-25 JP JP7100912A patent/JPH08295925A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008240114A (en) * | 2007-03-28 | 2008-10-09 | High Frequency Heattreat Co Ltd | Restrained quenching apparatus for thin plate member and method therefor |
| CN103526006A (en) * | 2013-09-26 | 2014-01-22 | 北京北方车辆集团有限公司 | High-frequency induction heating and heat processing technology of duplicate gear |
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