JP5029541B2 - Carburizing treatment method and apparatus - Google Patents

Carburizing treatment method and apparatus Download PDF

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JP5029541B2
JP5029541B2 JP2008223928A JP2008223928A JP5029541B2 JP 5029541 B2 JP5029541 B2 JP 5029541B2 JP 2008223928 A JP2008223928 A JP 2008223928A JP 2008223928 A JP2008223928 A JP 2008223928A JP 5029541 B2 JP5029541 B2 JP 5029541B2
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carburizing
workpiece
heating
isobutane
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JP2010059447A (en
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泰浩 小山
岳幸 島田
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Toyota Motor Corp
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    • 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
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Description

本発明は、鋼材にて構成されるワークを炭化水素雰囲気下で高周波誘導加熱により加熱して、前記ワーク表面に浸炭処理を行う浸炭処理方法および装置に関する。   The present invention relates to a carburizing method and apparatus for performing a carburizing process on the surface of a work by heating a work made of steel by high-frequency induction heating in a hydrocarbon atmosphere.

従来から、鋼材にて構成されるワークの表面に炭素を浸透拡散させて、ワーク表面層の炭素量を増加させる浸炭処理が行われている。
浸炭処理としては、例えば炭化水素ガスを含んだ雰囲気下でワークを９００℃程度以上の高温に加熱し、浸炭処理を行うガス浸炭処理が知られている。
また、真空に減圧された加熱炉内にやや減圧された炭化水素ガスを送入して浸炭処理を行う真空浸炭処理が知られている。
さらに、浸炭処理を行う際に、高周波加熱装置を用いた高周波誘導加熱によりワークの加熱を行う高周波浸炭処理が知られている。 Conventionally, a carburizing process has been performed in which carbon is permeated and diffused on the surface of a workpiece made of steel to increase the amount of carbon in the workpiece surface layer.
As the carburizing process, for example, a gas carburizing process is known in which a workpiece is heated to a high temperature of about 900 ° C. or higher in an atmosphere containing a hydrocarbon gas to perform the carburizing process.
A vacuum carburizing process is also known in which a slightly depressurized hydrocarbon gas is fed into a heating furnace depressurized to a vacuum to perform a carburizing process.
Furthermore, when performing carburizing treatment, high-frequency carburizing treatment is known in which a workpiece is heated by high-frequency induction heating using a high-frequency heating device.

特許文献１には、ガス浸炭処理には炭化水素ガスとしてプロパンやブタン等を用いること、および浸炭処理として高周波浸炭法があることが開示されている。
さらに、特許文献２には、高周波発振機から高周波加熱コイルに対して高周波電流を流し、ワークを加熱することが開示されている。
また、前述のガス浸炭処理や真空浸炭処理に用いられる炭化水素ガスとしては、前述のプロパンやブタンに加えて、メタンやエチレンやアセチレンが用いられることがある。
特開平９−５９７５６号公報 特公平４−４２４６６号公報 Patent Document 1 discloses that propane, butane, or the like is used as the hydrocarbon gas for the gas carburizing process, and that there is a high-frequency carburizing method as the carburizing process.
Furthermore, Patent Document 2 discloses that a high-frequency current is passed from a high-frequency oscillator to a high-frequency heating coil to heat the workpiece.
In addition to the propane and butane described above, methane, ethylene, and acetylene may be used as the hydrocarbon gas used in the gas carburizing process and the vacuum carburizing process.
Japanese Patent Laid-Open No. 9-59756 Japanese Patent Publication No. 4-42466

前述のように、ガス浸炭処理や真空浸炭処理には、浸炭性ガスとして、メタン、エチレン、プロパン、およびアセチレン等の炭化水素ガスが用いられているが、メタンやエチレンやプロパンでは浸炭速度が遅く、迅速で効率的な浸炭処理を行うことができなかった。
また、浸炭性ガスとしてアセチレンを用いると、浸炭速度が速いため迅速で効率的な浸炭処理を行うことができるが、高周波誘導加熱にてワークを加熱する際にアセチレンを用いると、アセチレンが高周波加熱コイルを構成している銅材などの金属と反応して爆発性物質（金属アセチリド）を生成するため、高周波浸炭処理における浸炭性ガスとしてアセチレンを用いることは好ましくない。 As described above, hydrocarbon gas such as methane, ethylene, propane, and acetylene is used as a carburizing gas in gas carburizing treatment and vacuum carburizing treatment, but the carburizing rate is slow in methane, ethylene, and propane. The carburizing process could not be performed quickly and efficiently.
In addition, when acetylene is used as the carburizing gas, the carburizing speed is high, so that quick and efficient carburizing treatment can be performed. However, when acetylene is used when heating a workpiece by high frequency induction heating, acetylene is heated by high frequency heating. It is not preferable to use acetylene as a carburizing gas in the high-frequency carburizing process because it generates an explosive substance (metal acetylide) by reacting with a metal such as a copper material constituting the coil.

そこで、本発明では、高周波誘導加熱により加熱したワークに浸炭性ガスを付与して浸炭処理を行う際に、爆発性物質を生成せずに迅速で効率的な浸炭処理を行うことができる浸炭処理方法および装置を提供するものである。   Therefore, in the present invention, when carburizing treatment is performed by applying a carburizing gas to a workpiece heated by high-frequency induction heating, carburizing treatment can be performed quickly and efficiently without generating explosive substances. Methods and apparatus are provided.

上記課題を解決する浸炭処理方法および装置は、以下の特徴を有する。
即ち、請求項１記載の如く、鋼材にて構成されるワークを、炭化水素ガスを含む雰囲気下で高周波誘導加熱により加熱して、前記ワーク表面に浸炭処理を行う浸炭処理方法であって、前記炭化水素雰囲気を構成する炭化水素ガスとしてイソブタンガスを用いる。
これにより、他の炭化水素ガスを用いた場合に比べて、単位時間あたりの浸炭量を多くすることができ、迅速で効率的な浸炭処理を行うことが可能となる。
また、イソブタンガスは、アセチレンなどとは異なり、高周波加熱コイルを構成する銅材などの金属材と爆発性物質を生成することがなく、安定して浸炭処理を行うことが可能である。 A carburizing method and apparatus for solving the above problems have the following characteristics.
That is, according to claim 1, a carburizing method for performing a carburizing process on a surface of the work by heating a work made of steel by high-frequency induction heating in an atmosphere containing a hydrocarbon gas, Isobutane gas is used as the hydrocarbon gas constituting the hydrocarbon atmosphere.
Thereby, compared with the case where other hydrocarbon gas is used, the amount of carburization per unit time can be increased, and it becomes possible to perform a quick and efficient carburizing process.
In addition, unlike acetylene, isobutane gas does not generate explosive substances and metallic materials such as copper materials that constitute a high-frequency heating coil, and can be carburized stably.

また、請求項２記載の如く、前記炭化水素ガスを含む雰囲気が含有するイソブタンガスの濃度は１％である。
これにより、イソブタンガスの濃度を１％という低濃度で用いても、充分な浸炭量を得ることができるので、低コストで浸炭処理を行うことが可能となる。 According to a second aspect of the present invention, the concentration of isobutane gas contained in the atmosphere containing the hydrocarbon gas is 1%.
As a result, even if the isobutane gas is used at a low concentration of 1%, a sufficient carburizing amount can be obtained, so that the carburizing process can be performed at a low cost.

また、請求項３記載の如く、鋼材にて構成されるワークを、炭化水素ガスを含む雰囲気の加熱炉内に収納するとともに高周波誘導加熱により加熱して、前記ワーク表面に浸炭処理を行う浸炭処理装置であって、ワークを収納し、炭化水素ガスが供給される加熱炉と、加熱炉内に配置される高周波加熱コイルとを備え、前記加熱炉に供給される炭化水素ガスがイソブタンガスである。
これにより、他の炭化水素ガスを用いた場合に比べて、単位時間あたりの浸炭量を多くすることができ、迅速で効率的な浸炭処理を行うことが可能となる。
また、イソブタンガスは、アセチレンなどとは異なり、高周波加熱コイルを構成する銅材などの金属材と爆発性物質を生成することがなく、安定して浸炭処理を行うことが可能である。 In addition, as described in claim 3, a carburizing treatment is performed in which a workpiece composed of a steel material is housed in a heating furnace having an atmosphere containing a hydrocarbon gas and is heated by high-frequency induction heating to carburize the workpiece surface. An apparatus comprising a heating furnace that houses a workpiece and is supplied with hydrocarbon gas, and a high-frequency heating coil disposed in the heating furnace, and the hydrocarbon gas supplied to the heating furnace is isobutane gas .
Thereby, compared with the case where other hydrocarbon gas is used, the amount of carburization per unit time can be increased, and it becomes possible to perform a quick and efficient carburizing process.
In addition, unlike acetylene, isobutane gas does not generate explosive substances and metallic materials such as copper materials that constitute a high-frequency heating coil, and can be carburized stably.

また、請求項４記載の如く、前記加熱炉内の炭化水素ガスを含む雰囲気が含有するイソブタンガスの濃度が１％である。
これにより、イソブタンガスの濃度を１％という低濃度で用いても、充分な浸炭量を得ることができるので、低コストで浸炭処理を行うことが可能となる。 According to a fourth aspect of the present invention, the concentration of isobutane gas contained in the atmosphere containing the hydrocarbon gas in the heating furnace is 1%.
As a result, even if the isobutane gas is used at a low concentration of 1%, a sufficient carburizing amount can be obtained, so that the carburizing process can be performed at a low cost.

本発明によれば、他の炭化水素ガスを用いた場合に比べて、迅速で効率的な浸炭処理を安定して行うことが可能となる。   According to the present invention, it is possible to stably perform a quick and efficient carburizing process as compared with the case where other hydrocarbon gas is used.

次に、本発明を実施するための形態を、添付の図面を用いて説明する。   Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.

図１に示す加熱炉１は、鋼材にて構成されるワーク１１を高周波誘導加熱により加熱するとともに、該ワーク１１の表面に炭素を浸透拡散させる浸炭処理を行うためのものである。
前記加熱炉１内には、高周波加熱装置を構成する高周波加熱コイル２が設けられており、交流電源５に接続された高周波加熱コイル２内にワーク１１を配置することにより、ワーク１１が所定の温度に高周波誘導加熱されるように構成している。
前記高周波加熱コイル２は、例えば銅材などの金属材にて構成されている。 A heating furnace 1 shown in FIG. 1 is for performing a carburizing process in which a workpiece 11 made of a steel material is heated by high-frequency induction heating and carbon is permeated and diffused on the surface of the workpiece 11.
In the heating furnace 1, a high-frequency heating coil 2 constituting a high-frequency heating device is provided. By placing the work 11 in the high-frequency heating coil 2 connected to the AC power supply 5, the work 11 is fixed to a predetermined temperature. It is configured to be high-frequency induction heated to temperature.
The high-frequency heating coil 2 is made of a metal material such as a copper material.

また、前記加熱炉１には、該加熱炉１内に浸炭性ガスなどのガスを供給するためのガス供給管３が接続されており、ワーク１１の浸炭処理を行うときには、前記ガス供給管３を通じて加熱炉１内に所定の流量の浸炭性ガスなどが供給されるように構成されている。   The heating furnace 1 is connected to a gas supply pipe 3 for supplying a gas such as a carburizing gas into the heating furnace 1, and the gas supply pipe 3 is used when the workpiece 11 is carburized. A carburizing gas or the like having a predetermined flow rate is supplied into the heating furnace 1.

本例の場合、ワーク１１に対する浸炭処理を行う際には、前記ガス供給管３を通じて所定量の浸炭性ガスおよび窒素ガスを加熱炉１内に供給するようにしている。
つまり、加熱炉１によるワーク１１への浸炭処理は、浸炭性ガスおよび窒素ガスの混合ガス雰囲気下で行われる。
具体的には、本例の場合、浸炭性ガスとなる炭化水素ガスとして、イソブタンガス（Ｃ４Ｈ１０）を用いており、前記炭化水素ガスを含む混合ガス雰囲気におけるイソブタンガスの濃度は１％に設定されている。 In the case of this example, when carburizing the workpiece 11, a predetermined amount of carburizing gas and nitrogen gas are supplied into the heating furnace 1 through the gas supply pipe 3.
That is, the carburizing process to the workpiece 11 by the heating furnace 1 is performed in a mixed gas atmosphere of carburizing gas and nitrogen gas.
Specifically, in the case of this example, isobutane gas (C 4 H 10 ) is used as the hydrocarbon gas that becomes the carburizing gas, and the concentration of isobutane gas in the mixed gas atmosphere containing the hydrocarbon gas is 1%. Is set to

このように、前記加熱炉１および高周波加熱コイル２を備えた浸炭処理装置を用い、ワーク１１を高周波誘導加熱にて加熱して行う、ワーク１１に対する浸炭処理の方法について、以下に説明する。   Thus, the method of the carburizing process with respect to the workpiece | work 11 performed by heating the workpiece | work 11 by high frequency induction heating using the carburizing apparatus provided with the said heating furnace 1 and the high frequency heating coil 2 is demonstrated below.

ワーク１１に浸炭処理を行う場合、まずワーク１１を加熱炉１内に設置する。この場合、ワーク１１は、例えば空芯状に巻回された高周波加熱コイル２内に挿入するように設置する。
次に、前記ガス供給管３を通じて、所定の流量のイソブタンガスと窒素ガスとの混合ガスを、加熱炉１内に供給するとともに、前記高周波加熱コイル２に通電してワーク１１を加熱する。この場合、例えば、混合ガス中におけるイソブタンガスの濃度は１％に設定されている。 When carburizing the workpiece 11, the workpiece 11 is first installed in the heating furnace 1. In this case, the workpiece 11 is installed so as to be inserted into the high-frequency heating coil 2 wound in an air core shape, for example.
Next, a mixed gas of isobutane gas and nitrogen gas at a predetermined flow rate is supplied into the heating furnace 1 through the gas supply pipe 3, and the work 11 is heated by energizing the high-frequency heating coil 2. In this case, for example, the concentration of isobutane gas in the mixed gas is set to 1%.

図２に示すように、イソブタンガスと窒素ガスとの混合ガス雰囲気下（当該ガス雰囲気は常圧）の加熱炉１内に設置されたワーク１１は、加熱工程において、加熱開始から所定の時間ｔ１をかけて所定の温度Ｔａに加熱される。
ワーク１１が温度Ｔａまで加熱された後は、その温度Ｔａが所定の時間ｔ２だけ保持され浸炭工程が行われる。
つまり、ワーク１１が温度Ｔａに保持される時間ｔ２の間に加熱炉１内の雰囲気のイソブタンガスによりワーク１１の表面が浸炭される。 As shown in FIG. 2, the workpiece 11 installed in the heating furnace 1 under a mixed gas atmosphere of isobutane gas and nitrogen gas (the gas atmosphere is at normal pressure) is heated for a predetermined time t1 from the start of heating in the heating step. And heated to a predetermined temperature Ta.
After the workpiece 11 is heated to the temperature Ta, the temperature Ta is maintained for a predetermined time t2, and the carburizing process is performed.
That is, the surface of the workpiece 11 is carburized by the isobutane gas in the atmosphere in the heating furnace 1 during the time t2 when the workpiece 11 is held at the temperature Ta.

さらに、ワーク１１は所定の時間ｔ３だけ温度Ｔａに保持され拡散工程が行われる。
つまり、ワーク１１が温度Ｔａに保持される時間ｔ３の間にワーク１１の表面に侵入した炭素がワーク１１内部へ拡散する。
その後、ワーク１１は例えば空冷処理により冷却されてワーク１１に対する浸炭処理が終了する。 Further, the workpiece 11 is held at the temperature Ta for a predetermined time t3 and a diffusion process is performed.
That is, carbon that has entered the surface of the workpiece 11 diffuses into the workpiece 11 during the time t3 when the workpiece 11 is held at the temperature Ta.
Thereafter, the work 11 is cooled, for example, by air cooling, and the carburizing process for the work 11 is completed.

なお、実際には、ワーク１１の表面に炭素を侵入させる浸炭工程においてもワーク１１表面に侵入した炭素の拡散は進行し、ワーク１１表面に侵入した炭素を拡散させる拡散工程においてもワーク１１表面への炭素の侵入は進行する。
また、前記時間ｔ１、ｔ２、ｔ３は、例えばそれぞれ１２０秒に設定され、前記温度Ｔａは例えば１１００℃に設定されるが、これらの時間および温度に限るものではなく、所望の時間および温度に設定することができる。 Actually, the diffusion of carbon that has entered the surface of the work 11 proceeds also in the carburizing step of intruding carbon into the surface of the work 11, and the surface of the work 11 is also diffused in the diffusion step of diffusing the carbon that has entered the surface of the work 11. The carbon invasion proceeds.
Further, the times t1, t2, and t3 are set to 120 seconds, for example, and the temperature Ta is set to 1100 ° C., for example. However, the present invention is not limited to these times and temperatures, and is set to desired times and temperatures. can do.

次に、前述のように実施される浸炭処理を実際に行った場合の、浸炭性ガスとして用いられる炭化水素ガスの種類による、ワーク１１に対する浸炭量の違いを試験により確認したので説明する。   Next, the difference in the amount of carburizing with respect to the workpiece 11 due to the type of hydrocarbon gas used as the carburizing gas when the carburizing process performed as described above is actually performed will be described.

まず、試験条件について説明する。
図３に示すように、試験に用いたワーク１１としては、φ１８×４０ｍｍの形状に形成されたクロムモリブデン鋼（ＳＣＭ４２０）を用いた。
また、加熱工程の時間ｔ１、浸炭工程の時間ｔ２、および拡散工程の時間ｔ３は、それぞれ１２０秒に設定し、ワーク１１の加熱温度Ｔａは１１００℃に設定した。 First, test conditions will be described.
As shown in FIG. 3, chrome molybdenum steel (SCM420) formed in a shape of φ18 × 40 mm was used as the workpiece 11 used in the test.
The heating process time t1, the carburizing process time t2, and the diffusion process time t3 were each set to 120 seconds, and the heating temperature Ta of the workpiece 11 was set to 1100 ° C.

さらに、浸炭性ガスとなる炭化水素ガスとしては、本例の１％濃度のイソブタンガス（イソブタン（Ｃ４Ｈ１０）１％＋窒素（Ｎ２））に加えて、比較例として、１％濃度のメタンガス（メタン（ＣＨ４）１％＋窒素（Ｎ２））、１％濃度のエチレンガス（エチレン（Ｃ２Ｈ４）１％＋窒素（Ｎ２））、１％濃度のプロパンガス（プロパン（Ｃ３Ｈ８）１％＋窒素（Ｎ２））、および１％濃度のｎ−ブタンガス（ｎ−ブタン（Ｃ４Ｈ１０）１％＋窒素（Ｎ２））を用いた。 In addition to the 1% concentration of isobutane gas (isobutane (C 4 H 10 ) 1% + nitrogen (N 2 )) of this example, the hydrocarbon gas that becomes the carburizing gas is a 1% concentration as a comparative example. Methane gas (methane (CH 4 ) 1% + nitrogen (N 2 )), 1% concentration ethylene gas (ethylene (C 2 H 4 ) 1% + nitrogen (N 2 )), 1% concentration propane gas (propane (C 3 H 8 ) 1% + nitrogen (N 2 )) and 1% concentration of n-butane gas (n-butane (C 4 H 10 ) 1% + nitrogen (N 2 )) were used.

前記各炭化水素ガスを用いてワーク１１に対する浸炭処理を行った結果を図４に示す。
なお、図４においては、ワーク１１への浸炭量は、浸炭処理前後でのワーク１１の重量変化量にて表している。
すなわち、浸炭処理前から浸炭処理後にかけて増加したワーク１１の重量を、該ワーク１１の浸炭量としている。 The result of carburizing the workpiece 11 using each hydrocarbon gas is shown in FIG.
In FIG. 4, the amount of carburization to the workpiece 11 is represented by the amount of change in the weight of the workpiece 11 before and after the carburizing process.
That is, the weight of the workpiece 11 increased from before the carburizing process to after the carburizing process is used as the carburizing amount of the workpiece 11.

図４によれば、ワーク１１の重量変化量は、１％濃度のメタンガスでは１．５ｍｇであり、１％濃度のエチレンガスでは５ｍｇであり、１％濃度のプロパンガスでは１４ｍｇであり、１％濃度のｎ−ブタンガスでは８ｍｇであって、１％濃度のイソブタンガスでの３６ｍｇに対して何れの炭化水素ガスにおいても少なくなっている。   According to FIG. 4, the weight change amount of the work 11 is 1.5 mg for 1% methane gas, 5 mg for 1% ethylene gas, 14 mg for 1% propane gas, 1% The concentration of n-butane gas is 8 mg, which is smaller in any hydrocarbon gas than 36 mg of 1% concentration of isobutane gas.

特に、１％濃度のイソブタンガス以外の炭化水素ガスの中で最も重量変化量が多い１％濃度のプロパンガスの場合でも重量変化量は１４ｍｇであり、１％濃度のイソブタンガスの場合の重量変化量はその約２．６倍となる３６ｍｇであって、１％濃度のイソブタンガスの場合の重量変化量とその他の炭化水素ガスの場合の重量変化量との間には大きな差がある。
また、イソブタンガスの構造異性体である１％濃度のｎ−ブタンガスの場合の重量変化量は８ｍｇであるのに対して、１％濃度のイソブタンガスの場合の重量変化量（３６ｍｇ）はその４．５倍であり、その差は非常に大きくなっている。 In particular, even in the case of 1% concentration propane gas having the largest weight change amount among hydrocarbon gases other than 1% concentration isobutane gas, the weight change amount is 14 mg, and the weight change in the case of 1% concentration isobutane gas. The amount is 36 mg, which is approximately 2.6 times that, and there is a large difference between the weight change amount in the case of 1% isobutane gas and the weight change amount in the case of other hydrocarbon gases.
The weight change in the case of 1% concentration n-butane gas, which is a structural isomer of isobutane gas, is 8 mg, whereas the weight change in the case of 1% concentration of isobutane gas (36 mg) is 4 The difference is very large.

このように、高周波誘導加熱によりワーク１１を加熱して浸炭処理を行う場合に、浸炭性ガスとなる炭化水素ガスとしてイソブタンガスを用いることで、他の炭化水素ガスを用いた場合と比較して単位時間あたりの浸炭量を多くすることができ、迅速で効率的な浸炭処理を行うことが可能となる。
また、イソブタンガスは、アセチレンなどとは異なり、高周波加熱コイル２を構成する銅材などの金属材と爆発性物質を生成することがなく、安定して浸炭処理を行うことが可能である。 Thus, when performing the carburizing process by heating the workpiece 11 by high frequency induction heating, by using isobutane gas as the hydrocarbon gas that becomes the carburizing gas, compared to the case of using other hydrocarbon gas. The amount of carburization per unit time can be increased, and a quick and efficient carburizing process can be performed.
Further, unlike acetylene or the like, isobutane gas does not generate a metal material such as a copper material constituting the high-frequency heating coil 2 and an explosive substance, and can be carburized stably.

また、浸炭性ガスとなる炭化水素ガスにイソブタンガスを用いる場合、イソブタンガスの濃度を１％という低濃度で用いても、充分な浸炭量を得ることができるので、低コストで浸炭処理を行うことが可能となる。   In addition, when isobutane gas is used as the hydrocarbon gas, which is a carburizing gas, a sufficient carburizing amount can be obtained even when the isobutane gas concentration is as low as 1%, so that the carburizing process is performed at low cost. It becomes possible.

加熱炉を示す概略図である。It is the schematic which shows a heating furnace. 加熱炉により浸炭処理を行う際の温度プロファイルを示す図である。It is a figure which shows the temperature profile at the time of performing a carburizing process with a heating furnace. 炭化水素ガスの種類によるワークに対する浸炭量の違いを比較するための試験条件を示す図である。It is a figure which shows the test conditions for comparing the difference in the carburizing amount with respect to the workpiece | work by the kind of hydrocarbon gas. 炭化水素ガスの種類による、ワークに対する浸炭量の違いを示す図である。It is a figure which shows the difference in the carburizing amount with respect to a workpiece | work by the kind of hydrocarbon gas.

符号の説明Explanation of symbols

１ 加熱炉
２ 高周波加熱コイル
３ ガス供給管
５ 交流電源
１１ ワーク DESCRIPTION OF SYMBOLS 1 Heating furnace 2 High frequency heating coil 3 Gas supply pipe 5 AC power supply 11 Workpiece

Claims (4)

鋼材にて構成されるワークを、炭化水素ガスを含む雰囲気下で高周波誘導加熱により加熱して、前記ワーク表面に浸炭処理を行う浸炭処理方法であって、
前記炭化水素雰囲気を構成する炭化水素ガスとしてイソブタンガスを用いる、
ことを特徴とする浸炭処理方法。 It is a carburizing method for heating a workpiece composed of steel by high frequency induction heating in an atmosphere containing a hydrocarbon gas and performing a carburizing treatment on the workpiece surface,
Use isobutane gas as the hydrocarbon gas constituting the hydrocarbon atmosphere,
A carburizing method characterized by that. 前記炭化水素ガスを含む雰囲気が含有するイソブタンガスの濃度は１％である、
ことを特徴とする請求項１に記載の浸炭処理方法。 The concentration of isobutane gas contained in the atmosphere containing the hydrocarbon gas is 1%.
The carburizing method according to claim 1. 鋼材にて構成されるワークを、炭化水素ガスを含む雰囲気の加熱炉内に収納するとともに高周波誘導加熱により加熱して、前記ワーク表面に浸炭処理を行う浸炭処理装置であって、
ワークを収納し、炭化水素ガスが供給される加熱炉と、
加熱炉内に配置される高周波加熱コイルとを備え、
前記加熱炉に供給される炭化水素ガスがイソブタンガスである、
ことを特徴とする浸炭処理装置。 It is a carburizing apparatus that performs a carburizing process on the surface of the work by storing a work made of steel in a heating furnace in an atmosphere containing a hydrocarbon gas and heating the work by high frequency induction heating,
A heating furnace that houses the workpiece and is supplied with hydrocarbon gas;
A high-frequency heating coil disposed in the heating furnace,
The hydrocarbon gas supplied to the heating furnace is isobutane gas.
A carburizing apparatus characterized by that. 前記加熱炉内の炭化水素ガスを含む雰囲気が含有するイソブタンガスの濃度が１％である、
ことを特徴とする請求項３に記載の浸炭処理装置。


The concentration of isobutane gas contained in the atmosphere containing hydrocarbon gas in the heating furnace is 1%.
The carburizing apparatus according to claim 3.


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