JP2007302945A - Carburizing apparatus - Google Patents

Carburizing apparatus Download PDF

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JP2007302945A
JP2007302945A JP2006132677A JP2006132677A JP2007302945A JP 2007302945 A JP2007302945 A JP 2007302945A JP 2006132677 A JP2006132677 A JP 2006132677A JP 2006132677 A JP2006132677 A JP 2006132677A JP 2007302945 A JP2007302945 A JP 2007302945A
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furnace
dew point
temperature
gas
sensor
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Kazuyoshi Yamaguchi
和嘉 山口
Showa Tachisato
暁華 立里
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JTEKT Thermo Systems Corp
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Koyo Thermo Systems Co Ltd
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Priority to JP2006132677A priority Critical patent/JP2007302945A/en
Priority to CN 200610128957 priority patent/CN101070588A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a carburizing apparatus capable of adequately maintaining the quality of a work by correctly calculating CP (Carbon Potential) of the in-furnace atmosphere having no composition change without any error, and adjusting the feed of an enriched gas by the calculated CP. <P>SOLUTION: A gas cooler 6, a filter 7, a dew point sensor 8 and a control unit 11 are provided on an exhaust pipe 5 of a carburizing device 10. The gas cooler 6 cools the atmosphere gas exhausted in the exhaust pipe 5 from the inside of a furnace 1 to the measurement temperature of about 60°C. The filter 7 removes the dust of the atmosphere gas flowing in the exhaust pipe 5. The dew point sensor 8 measures the dew point temperature of the atmosphere gas with its dust removed after being cooled to the measurement temperature in the exhaust pipe 5. The control unit 11 calculates CP of the atmosphere gas in the furnace 1 based on the dew point temperature of the atmosphere gas measured by the dew point sensor 8 by an operation unit 12, and the temperature of the atmosphere gas in the furnace 1 measured by the temperature sensor 9, and adjusts the feed of the enriched gas based on CP by an adjustment unit 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、機械部品等の鋼部材等の表面を硬化させるための浸炭処理を行う浸炭装置に関する。   The present invention relates to a carburizing apparatus that performs a carburizing process for hardening the surface of a steel member or the like such as a machine part.

鋼部材等の表面に対する浸炭処理では、浸炭炉内の浸炭性雰囲気ガス（以下、炉内雰囲気ともいう。）のカーボンポテンシャル（以下、ＣＰという。）が処理後の被処理品の品質に大きな影響を与える。このため、浸炭装置では、浸炭処理中に炉内雰囲気のＣＰが制御される。この制御では、炉内雰囲気の酸素濃度、二酸化炭素濃度、水分量又はメタンガス濃度等を測定し、この測定結果から炉内雰囲気のＣＰ値が算出され、算出結果に応じて炉内雰囲気に対するエンリッチガスの供給量が調整される。   In carburizing treatment on the surface of steel members, etc., the carbon potential (hereinafter referred to as CP) of the carburizing atmosphere gas in the carburizing furnace (hereinafter also referred to as furnace atmosphere) has a significant effect on the quality of the processed product after processing. give. For this reason, in the carburizing apparatus, the CP of the furnace atmosphere is controlled during the carburizing process. In this control, the oxygen concentration, carbon dioxide concentration, moisture content, methane gas concentration, etc. of the furnace atmosphere are measured, and the CP value of the furnace atmosphere is calculated from this measurement result, and the enriched gas for the furnace atmosphere is calculated according to the calculation result. The supply amount is adjusted.

従来の浸炭装置では、制御の自動化のために、炉内雰囲気の酸素濃度又は二酸化炭素濃度の測定結果からＣＰ値を算出する方法が主に採用されている（例えば、特許文献１参照。）。炉内雰囲気の酸素濃度を測定する場合には、例えばジルコニアセンサが炉内に挿入される。炉内雰囲気の二酸化炭素濃度を測定する場合には、炉内に連通したサンプリング用のパイプを経由して炉内雰囲気を計器に導く。
特許第２５９２５１７号公報 In the conventional carburizing apparatus, a method of calculating the CP value from the measurement result of the oxygen concentration or the carbon dioxide concentration in the furnace atmosphere is mainly employed for control automation (for example, see Patent Document 1). When measuring the oxygen concentration in the furnace atmosphere, for example, a zirconia sensor is inserted into the furnace. When measuring the carbon dioxide concentration in the furnace atmosphere, the furnace atmosphere is guided to a meter via a sampling pipe communicating with the furnace.
Japanese Patent No. 2592517

しかしながら、炉内に挿入したセンサによって炉内雰囲気の酸素濃度を測定する方法では、炉内に挿入されたセンサの電極を構成するプラチナの触媒作用により、センサ近傍では炉内に供給されたエンリッチガスの分解が促進される。このため、センサ内では酸素濃度が炉内の平均酸素濃度よりも低くなり、センサの測定値から算出されたＣＰ値が実際の炉内雰囲気のＣＰ値よりも高くなる問題がある。   However, in the method of measuring the oxygen concentration in the furnace atmosphere with the sensor inserted in the furnace, the enriched gas supplied into the furnace in the vicinity of the sensor due to the catalytic action of platinum constituting the electrode of the sensor inserted in the furnace. Decomposition is promoted. For this reason, there is a problem that the oxygen concentration in the sensor is lower than the average oxygen concentration in the furnace, and the CP value calculated from the measured value of the sensor is higher than the CP value in the actual furnace atmosphere.

また、炉内からサンプリング用のパイプを経由して計器に導かれた炉内雰囲気の二酸化炭素濃度を測定する方法では、炉内雰囲気の変化に対する制御の応答性が悪い。さらに、サンプリング用のパイプを通過する間に炉内雰囲気の温度が徐々に低下し、それに伴って炉内雰囲気の組成が変化する。このため、炉内雰囲気のＣＰ値を正確に測定することができない問題がある。   Further, in the method of measuring the carbon dioxide concentration in the furnace atmosphere guided to the instrument from the furnace via the sampling pipe, the control responsiveness to the change in the furnace atmosphere is poor. Furthermore, the temperature of the furnace atmosphere gradually decreases while passing through the sampling pipe, and the composition of the furnace atmosphere changes accordingly. For this reason, there is a problem that the CP value of the furnace atmosphere cannot be measured accurately.

この発明の目的は、排気管内を排出される炉内雰囲気の冷却後の露点を測定し、測定した露点からＣＰ値を算出することにより、組成が変化していない炉内雰囲気のＣＰ値を誤差を伴うことなく正確に算出することができ、被処理品の適正な品質を確保及び維持することができる浸炭装置を提供することにある。   An object of the present invention is to measure the dew point after cooling of the furnace atmosphere discharged from the exhaust pipe, and calculate the CP value from the measured dew point, thereby obtaining an error in the CP value of the furnace atmosphere whose composition has not changed. It is an object of the present invention to provide a carburizing apparatus that can accurately calculate without being accompanied by, and can ensure and maintain an appropriate quality of a processed product.

上記の課題を解決するために、この発明の浸炭装置は、炉、冷却手段、露点センサ、温度センサ、調節器及び制御手段を備えている。炉は、浸炭性雰囲気中で被処理品を収納して所定の浸炭温度に昇温される。冷却手段は、炉内雰囲気を炉外で所定の測定温度に冷却する。露点センサは、冷却手段によって冷却された炉内雰囲気の露点温度を測定する。温度センサは、炉内の温度を測定する。調節器は、炉内雰囲気に対するエンリッチガスの導入量を調節する。制御手段は、露点センサ及び温度センサの測定結果から炉内雰囲気のＣＰを算出し、算出したＣＰに基づいて調節器によるエンリッチガスの導入量を増減させる。   In order to solve the above problems, the carburizing apparatus of the present invention includes a furnace, a cooling means, a dew point sensor, a temperature sensor, a regulator, and a control means. The furnace stores the article to be processed in a carburizing atmosphere and is heated to a predetermined carburizing temperature. The cooling means cools the atmosphere in the furnace to a predetermined measurement temperature outside the furnace. The dew point sensor measures the dew point temperature of the furnace atmosphere cooled by the cooling means. The temperature sensor measures the temperature in the furnace. The adjuster adjusts the amount of enriched gas introduced into the furnace atmosphere. The control means calculates the CP of the furnace atmosphere from the measurement results of the dew point sensor and the temperature sensor, and increases or decreases the amount of rich gas introduced by the regulator based on the calculated CP.

冷却手段及び露点センサは、例えば、炉内雰囲気の排気経路を構成する排気管中に順に配置される。冷却手段及び露点センサは、排気管に設けた分岐管に配置することもできる。   The cooling means and the dew point sensor are sequentially arranged in, for example, an exhaust pipe constituting an exhaust path of the furnace atmosphere. The cooling means and the dew point sensor can be arranged in a branch pipe provided in the exhaust pipe.

また、排気経路中の冷却手段と露点センサとの間には、炉内雰囲気中の塵埃を除去するフィルタがさらに備えられる場合がある。   Further, a filter for removing dust in the furnace atmosphere may be further provided between the cooling means in the exhaust path and the dew point sensor.

この発明の浸炭装置では、炉内で所定の浸炭温度に昇温されて浸炭処理に用いられる炉内雰囲気が、炉外で所定の測定温度に冷却された後に露点センサによる露点温度の測定を受ける。測定された露点温度と炉内温度とから算出された炉内雰囲気のＣＰに基づいて炉内雰囲気に導入されるエンリッチガスの量が増減される。   In the carburizing apparatus according to the present invention, the temperature inside the furnace is increased to a predetermined carburizing temperature in the furnace and the atmosphere in the furnace used for the carburizing process is cooled to the predetermined measuring temperature outside the furnace, and then the dew point temperature is measured by the dew point sensor. . The amount of enriched gas introduced into the furnace atmosphere is increased or decreased based on the CP of the furnace atmosphere calculated from the measured dew point temperature and the furnace temperature.

したがって、炉内雰囲気は、浸炭温度から測定温度まで急冷されることで反応が凍結し、炉内での組成が保たれたままの状態で露点温度の測定を受ける。浸炭処理に用いられている状態の炉内雰囲気の露点温度が誤差なく測定され、正確なＣＰが算出される。そして、正確なＣＰに基づく適正な量のエンリッチガスが炉内に導入される。   Accordingly, the furnace atmosphere is rapidly cooled from the carburizing temperature to the measurement temperature, so that the reaction freezes and the dew point temperature is measured while the composition in the furnace is maintained. The dew point temperature of the atmosphere in the furnace used for carburizing treatment is measured without error, and an accurate CP is calculated. An appropriate amount of enriched gas based on accurate CP is then introduced into the furnace.

冷却手段及び露点センサを排気管の排気経路中に順に配置することで、露点温度を測定するためのサンプリングパイプが不要になる。   By arranging the cooling means and the dew point sensor in order in the exhaust path of the exhaust pipe, a sampling pipe for measuring the dew point temperature becomes unnecessary.

また、フィルタを排気経路中の冷却手段と露点センサとの間に配置することで、炉内雰囲気の露点温度が、塵埃の影響を受けることなく正確に測定される。   Further, by disposing the filter between the cooling means in the exhaust path and the dew point sensor, the dew point temperature of the furnace atmosphere can be accurately measured without being affected by dust.

この発明の浸炭装置によれば、浸炭処理に用いられている炉内雰囲気の露点温度を誤差なく測定することができ、正確なＣＰに基づく適正な量のエンリッチガスを炉内に導入することができる。これによって、被処理品の適正な品質を確保及び維持することができる。   According to the carburizing apparatus of the present invention, the dew point temperature of the furnace atmosphere used for the carburizing process can be measured without error, and an appropriate amount of enriched gas based on accurate CP can be introduced into the furnace. it can. Thereby, it is possible to ensure and maintain the proper quality of the product to be processed.

また、冷却手段及び露点センサを排気管の排気経路中に順に配置することができ、露点温度を測定するためのサンプリングパイプを別途備える必要がなく、測定の応答性がよくなることに加え、装置の構成を簡略化することができる。   In addition, the cooling means and the dew point sensor can be arranged in order in the exhaust path of the exhaust pipe, and it is not necessary to separately provide a sampling pipe for measuring the dew point temperature. The configuration can be simplified.

さらに、フィルタを排気経路中の冷却手段と露点センサとの間に配置することができ、炉内雰囲気の露点温度をより正確に測定することができる。   Furthermore, the filter can be disposed between the cooling means in the exhaust path and the dew point sensor, and the dew point temperature of the furnace atmosphere can be measured more accurately.

図１は、この発明の実施形態に係る浸炭装置の概略の構成を示す図である。浸炭装置１０は、炉１、ヒータ２、ファン３、導入管４、排気管５、ガスクーラ６、フィルタ７、露点センサ８、温度センサ９、制御部１１、供給管１４、モータバルブ１５を備えている。   FIG. 1 is a diagram showing a schematic configuration of a carburizing apparatus according to an embodiment of the present invention. The carburizing apparatus 10 includes a furnace 1, a heater 2, a fan 3, an introduction pipe 4, an exhaust pipe 5, a gas cooler 6, a filter 7, a dew point sensor 8, a temperature sensor 9, a control unit 11, a supply pipe 14, and a motor valve 15. Yes.

炉１は、内部に浸炭処理を施されるべき被処理品２０を収納する。ヒータ２は、炉１内の温度を例えば９３０℃程度の浸炭温度に昇温する。ファン３は、炉１内の雰囲気ガスを撹拌して均一化する。導入管４は、炉１内に浸炭用のキャリアガスにエンリッチガスを混合した浸炭性雰囲気ガスを導入する。キャリアガスとしては、例えば、ＲＸガスが用いられる。エンリッチガスとしては、例えば、メタンガス、ブタンガス又はエタンガス等の炭化水素ガスが用いられる。   The furnace 1 accommodates an article to be processed 20 to be carburized. The heater 2 raises the temperature in the furnace 1 to a carburizing temperature of about 930 ° C., for example. The fan 3 agitates and homogenizes the atmospheric gas in the furnace 1. The introduction pipe 4 introduces a carburizing atmosphere gas obtained by mixing an enriched gas into a carburizing carrier gas into the furnace 1. For example, RX gas is used as the carrier gas. As the enriched gas, for example, hydrocarbon gas such as methane gas, butane gas or ethane gas is used.

排気管５は、炉１内の雰囲気ガスを外部に排出する際の排気経路を構成する。ガスクーラ６、フィルタ７及び露点センサ８は、排気管５が構成する排気経路に沿ってこの順に配置される。ガスクーラ６は、この発明の冷却手段に相当し、炉１内から排気管５内に排出された雰囲気ガスを、雰囲気ガスの露点温度以上で、かつ露点センサ８の耐熱温度（例えば６０℃程度）以下の範囲内の温度（以下、測定温度という。）に冷却する。フィルタ７は、排気管５内を流れる雰囲気ガスの塵埃を除去する。露点センサ８は、排気管５内で測定温度に冷却された後に塵埃を除去された雰囲気ガスの露点温度を測定する。   The exhaust pipe 5 constitutes an exhaust path for discharging the atmospheric gas in the furnace 1 to the outside. The gas cooler 6, the filter 7 and the dew point sensor 8 are arranged in this order along the exhaust path formed by the exhaust pipe 5. The gas cooler 6 corresponds to the cooling means of the present invention, and the atmospheric gas discharged from the furnace 1 into the exhaust pipe 5 is equal to or higher than the dew point temperature of the atmospheric gas and the heat resistance temperature of the dew point sensor 8 (for example, about 60 ° C.). Cool to a temperature within the following range (hereinafter referred to as the measured temperature). The filter 7 removes atmospheric gas dust flowing in the exhaust pipe 5. The dew point sensor 8 measures the dew point temperature of the atmospheric gas from which dust has been removed after cooling to the measurement temperature in the exhaust pipe 5.

図２は、この発明の別の実施形態に係る浸炭装置の要部の構成を示す図である。この実施形態の浸炭装置２１では、排気管５の一部に排気管５よりも小径の分岐管５１を備え、この分岐管５１にガスクーラ６１、フィルタ７１及び露点センサ８をこの順に配置している。分岐管５１には、図示しない排気吸引手段が設けられており、排気管５内の雰囲気ガスの一部を分岐管５１内に導く。   FIG. 2 is a diagram showing a configuration of a main part of a carburizing apparatus according to another embodiment of the present invention. In the carburizing apparatus 21 of this embodiment, a branch pipe 51 having a smaller diameter than the exhaust pipe 5 is provided in a part of the exhaust pipe 5, and the gas cooler 61, the filter 71, and the dew point sensor 8 are arranged in this order in the branch pipe 51. . The branch pipe 51 is provided with an exhaust suction means (not shown) and guides part of the atmospheric gas in the exhaust pipe 5 into the branch pipe 51.

分岐管５１内を流れる雰囲気ガスの流量は排気管５内の流量よりも少ないため、ガスクーラ６１及びフィルタ７１の容量を小さくすることができ、コストダウンを図ることができる。   Since the flow rate of the atmospheric gas flowing in the branch pipe 51 is smaller than the flow rate in the exhaust pipe 5, the capacities of the gas cooler 61 and the filter 71 can be reduced, and the cost can be reduced.

温度センサ９は、炉１内の雰囲気ガスの温度を測定する。供給管１４は、導入管４に接続されている。モータバルブ１５は、この発明の調節器に相当し、供給管１４及び導入管４を経由して炉１内に供給するエンリッチガスの供給量を調節する。   The temperature sensor 9 measures the temperature of the atmospheric gas in the furnace 1. The supply pipe 14 is connected to the introduction pipe 4. The motor valve 15 corresponds to a regulator of the present invention, and regulates the supply amount of enriched gas supplied into the furnace 1 via the supply pipe 14 and the introduction pipe 4.

制御部１１は、演算部１２及び調節部１３を備えている。演算部１２には、露点センサ８及び温度センサ９の測定結果が入力される。演算部１２は、露点センサ８が測定した雰囲気ガスの露点温度に基づいて炉１内の雰囲気ガスの水分量を求める。なお、雰囲気ガスの水分量は露点センサ８から直接出力される場合もある。さらに、この水分量と炉１内の雰囲気ガスの温度とに基づいてＣＰを算出し、算出したＣＰを調節部１３に出力する。   The control unit 11 includes a calculation unit 12 and an adjustment unit 13. Measurement results of the dew point sensor 8 and the temperature sensor 9 are input to the calculation unit 12. The calculation unit 12 obtains the moisture content of the atmospheric gas in the furnace 1 based on the dew point temperature of the atmospheric gas measured by the dew point sensor 8. Note that the moisture content of the atmospheric gas may be directly output from the dew point sensor 8. Furthermore, CP is calculated based on the moisture content and the temperature of the atmospheric gas in the furnace 1, and the calculated CP is output to the adjusting unit 13.

演算部１２は、ＣＰを一例として、
ＣＰ＝Ａｓ（Ｋ３／Ｋ１）（ＰH2・ＰCO／ＰH2O ）・・・（１）
によって算出する。上記１式において、Ｋ１は反応［Ｃ＋ＣＯ2 ＝２ＣＯ］の平衡定数、Ｋ３は反応［ＣＯ2 ＋Ｈ2 ＝ＣＯ＋Ｈ2 Ｏ］の平衡定数、Ａｓは被処理品２０の温度センサ９によって測定された温度におけるオーステナイトの飽和カーボン濃度、ＰH2及びＰCOは雰囲気ガス中の水素と一酸化炭素との分圧、ＰH2O は雰囲気ガス中の水分量（水蒸気分圧）である。 The calculation unit 12 takes CP as an example.
CP = As (K3 / K1) (P H2 · P CO / P H2O ) (1)
Calculated by In the above equation 1, K1 is the equilibrium constant of the reaction [C + CO 2 = 2CO], K3 is the equilibrium constant of the reaction [CO 2 + H 2 = CO + H 2 O], and As is the temperature measured by the temperature sensor 9 of the workpiece 20. The saturated carbon concentration of austenite, P H2 and P CO are the partial pressures of hydrogen and carbon monoxide in the atmospheric gas, and P H2O is the moisture content (water vapor partial pressure) in the atmospheric gas.

雰囲気ガス中の水素と一酸化炭素との分圧ＰH2，ＰCOは、キャリアガスの組成から既知である。炉１内の雰囲気温度におけるオーステナイトの飽和カーボン濃度Ａｓは、既知である。雰囲気ガス中の水分量ＰH2O は、露点センサ８が測定した露点温度から求められる。平衡定数Ｋ１，Ｋ３は、温度センサ９が測定した雰囲気ガスの温度から周知の計算式によって求められる。したがって、雰囲気ガスの露点温度を露点センサ８で測定し、炉１内の雰囲気ガスの温度を温度センサ９で測定することで、雰囲気ガスのＣＰを算出できる。 The partial pressures P H2 and P CO of hydrogen and carbon monoxide in the atmospheric gas are known from the composition of the carrier gas. The saturated carbon concentration As of austenite at the atmospheric temperature in the furnace 1 is known. The amount of moisture P H2O in the atmospheric gas is obtained from the dew point temperature measured by the dew point sensor 8. The equilibrium constants K1 and K3 are obtained by a well-known calculation formula from the temperature of the atmospheric gas measured by the temperature sensor 9. Therefore, by measuring the dew point temperature of the atmospheric gas with the dew point sensor 8 and measuring the temperature of the atmospheric gas in the furnace 1 with the temperature sensor 9, the CP of the atmospheric gas can be calculated.

露点センサ８が露点温度を測定する雰囲気ガスは、炉１内から排気管５内に排出された直後にガスクーラ６によって雰囲気ガスの露点温度以上で、かつ露点センサ８の耐熱温度（例えば６０℃程度）以下の測定温度に冷却され、雰囲気ガスの反応が凍結する。このため、炉１内の雰囲気ガスは組成が殆ど変化していない状態で露点センサ８の配置位置に達する。露点センサ８は、炉１内に存在している状態の雰囲気ガスの露点温度を正確に測定することができる。   The atmospheric gas whose dew point sensor 8 measures the dew point temperature is equal to or higher than the dew point temperature of the atmospheric gas by the gas cooler 6 immediately after being discharged from the furnace 1 into the exhaust pipe 5 and the heat resistance temperature of the dew point sensor 8 (for example, about 60 ° C.). ) Cooled to the following measurement temperature, the reaction of the atmospheric gas freezes. For this reason, the atmospheric gas in the furnace 1 reaches the arrangement position of the dew point sensor 8 in a state where the composition hardly changes. The dew point sensor 8 can accurately measure the dew point temperature of the atmospheric gas existing in the furnace 1.

これによって、図３に示すように、酸素濃度又は二酸化炭素濃度の測定結果を用いて算出した場合に比較して、露点センサ８が測定した露点温度に応じた水分量を用いてＣＰを正確に測定することができる。   As a result, as shown in FIG. 3, compared to the case of calculation using the measurement result of the oxygen concentration or carbon dioxide concentration, the CP is accurately determined using the moisture amount according to the dew point temperature measured by the dew point sensor 8. Can be measured.

調節部１３は、演算部１２から入力されたＣＰが、例えば、０．８％である設定値に一致するように、モータバルブ１５によるエンリッチガスの供給量を調節する。演算部１２から調節部１３に入力されるＣＰは上述のように炉１内の雰囲気ガスのＣＰを正確に掲出した値であるため、調節部１３がエンリッチガスの供給量を調節することによって炉１内の雰囲気ガスのＣＰを正確に設定値に一致させることができる。   The adjustment unit 13 adjusts the supply amount of the enriched gas by the motor valve 15 so that the CP input from the calculation unit 12 matches a set value that is, for example, 0.8%. Since the CP input from the calculation unit 12 to the adjustment unit 13 is a value that accurately displays the CP of the atmospheric gas in the furnace 1 as described above, the adjustment unit 13 adjusts the supply amount of the enriched gas to adjust the furnace. The CP of the atmospheric gas in 1 can be made to exactly match the set value.

この結果、炉１内で被処理品２０に対して適正な浸炭処理を施すことができ、被処理品２０の適正な品質を確保及び維持することができる。   As a result, it is possible to perform an appropriate carburizing process on the article to be processed 20 in the furnace 1, and to ensure and maintain an appropriate quality of the article to be processed 20.

上述の実施形態の説明は、すべての点で例示であって制限的なものでないと考えられるべきである。本発明の範囲は、特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味及び範囲内でのすべての変更が含まれる。   The above description of the embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and includes all modifications within the scope and meaning equivalent to the terms of the claims.

この発明の実施形態に係る浸炭装置の概略の構成を示す図である。It is a figure showing the composition of the outline of the carburizing device concerning the embodiment of this invention. この発明の別の実施形態に係る浸炭装置の要部の構成を示す図である。It is a figure which shows the structure of the principal part of the carburizing apparatus which concerns on another embodiment of this invention. 露点センサ８が測定した露点温度に応じた水分量を用いてＣＰを測定した結果と酸素濃度及び二酸化炭素濃度の測定結果を用いて算出した場合との比較を示す図である。It is a figure which shows the comparison with the case where it calculates using the measurement result of oxygen concentration and a carbon dioxide concentration, and the result of having measured CP using the moisture content according to the dew point temperature which the dew point sensor 8 measured.

符号の説明Explanation of symbols

１ 炉
２ ヒータ
３ ファン
４ 導入管
５ 排気管
６ ガスクーラ
７ フィルタ
８ 露点センサ
９ 温度センサ
１０ 浸炭装置
１１ 制御部
１２ 演算部
１３ 調節部
１４ 供給管
１５ モータバルブ
２０ 被処理品
５１ 分岐管 DESCRIPTION OF SYMBOLS 1 Furnace 2 Heater 3 Fan 4 Introductory pipe 5 Exhaust pipe 6 Gas cooler 7 Filter 8 Dew point sensor 9 Temperature sensor 10 Carburizing device 11 Control part 12 Calculation part 13 Control part 14 Supply pipe 15 Motor valve 20 Processed object 51 Branch pipe

Claims (4)

浸炭性雰囲気中で被処理品を収納して所定の浸炭温度に昇温される炉と、前記炉内の雰囲気ガスを前記炉外で所定の測定温度に冷却する冷却手段と、前記冷却手段によって冷却された雰囲気ガスの露点温度を測定する露点センサと、前記炉内の温度を測定する温度センサと、前記炉内の雰囲気ガスに対するエンリッチガスの導入量を調節する調節器と、前記露点センサ及び温度センサの測定結果から前記炉内の雰囲気ガスのカーボンポテンシャルを算出し、算出したカーボンポテンシャルに基づいて前記調節器によるエンリッチガスの導入量を増減させる制御手段と、を備えたことを特徴とする浸炭装置。   A furnace in which the article to be treated is stored in a carburizing atmosphere and heated to a predetermined carburizing temperature; a cooling means for cooling the atmospheric gas in the furnace to a predetermined measurement temperature outside the furnace; and the cooling means A dew point sensor for measuring the dew point temperature of the cooled atmospheric gas, a temperature sensor for measuring the temperature in the furnace, a regulator for adjusting the amount of the enriched gas introduced into the atmospheric gas in the furnace, the dew point sensor, and Control means for calculating the carbon potential of the atmospheric gas in the furnace from the measurement result of the temperature sensor, and increasing or decreasing the amount of the enriched gas introduced by the regulator based on the calculated carbon potential. Carburizing equipment. 前記炉内の雰囲気ガスの排気経路を構成する排気管をさらに備え、前記排気経路中に前記冷却手段及び前記露点センサをこの順に配置したことを特徴とする請求項１に記載の浸炭装置。   2. The carburizing apparatus according to claim 1, further comprising an exhaust pipe constituting an exhaust path for atmospheric gas in the furnace, wherein the cooling means and the dew point sensor are arranged in this order in the exhaust path. 前記排気管は、前記冷却手段及び前記露点センサをこの順に配置した分岐管を有することを特徴とする請求項１に記載の浸炭装置。   The carburizing apparatus according to claim 1, wherein the exhaust pipe includes a branch pipe in which the cooling unit and the dew point sensor are arranged in this order. 前記排気経路又は前記分岐管における前記冷却手段と前記露点センサとの間に、雰囲気ガス中の塵埃を除去するフィルタをさらに備えたことを特徴とする請求項１乃至３のいずれかに記載の浸炭装置。   The carburization according to any one of claims 1 to 3, further comprising a filter for removing dust in an atmospheric gas between the cooling means and the dew point sensor in the exhaust path or the branch pipe. apparatus.
JP2006132677A 2006-05-11 2006-05-11 Carburizing apparatus Pending JP2007302945A (en)

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JP2006132677A JP2007302945A (en) 2006-05-11 2006-05-11 Carburizing apparatus
CN 200610128957 CN101070588A (en) 2006-05-11 2006-09-05 Carbon immersing device

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009235451A (en) * 2008-03-26 2009-10-15 Taiyo Nippon Sanso Corp Heat-treatment method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009235451A (en) * 2008-03-26 2009-10-15 Taiyo Nippon Sanso Corp Heat-treatment method

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