JP2005113215A - Heat treatment system - Google Patents
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Abstract
Description
本発明は、鋼製部品に複合熱処理（一次熱処理および二次熱処理）を始め、各種熱処理を施すことのできる熱処理システムに関するものである。 The present invention relates to a heat treatment system capable of performing various heat treatments such as composite heat treatment (primary heat treatment and secondary heat treatment) on steel parts.
高い転動疲労寿命が求められる鋼製の機械部品、例えば転がり軸受の軸受部品に適合する熱処理方法として、特開平１５−２２６９１８号公報に記載されたものがある。これは、軸受部品用の鋼をＡ1変態点を超える浸炭窒化処理温度で浸炭窒化処理した後（一次熱処理）、Ａ1変態点未満の温度に冷却し、その後、Ａ1変態点以上で浸炭窒化処理の温度未満の焼入れ温度域（７９０℃〜８３０℃）に再加熱して焼入れを行う（二次熱処理）ものである。 Japanese Patent Laid-Open No. 15-226918 discloses a heat treatment method suitable for steel machine parts that require a high rolling fatigue life, such as rolling bearing parts. This is after carbonitriding steel for the bearing parts carbonitriding temperature exceeding the A 1 transformation point (primary heat treatment), and cooled to a temperature below the A 1 transformation point, then carburized by A 1 transformation point or more It is re-heated to a quenching temperature range (790 ° C. to 830 ° C.) lower than the nitriding temperature (secondary heat treatment).
この方法によれば、表層の浸炭窒化層の存在により軸受部品が高硬度化され、かつ再加熱時の焼入れ温度がオーステナイト結晶粒の成長が生じにくい温度に抑えられるので、オーステナイト粒径を平均粒径８μｍ以下まで微小化することができる。これにより粒界強度が増すため、転動疲労寿命の向上、さらには耐割れ性の向上等の効果が得られる。 According to this method, the presence of the carbonitriding layer on the surface layer increases the hardness of the bearing component, and the quenching temperature during reheating is suppressed to a temperature at which austenite crystal grains do not easily grow. The diameter can be reduced to 8 μm or less. As a result, the grain boundary strength is increased, so that effects such as improvement of rolling fatigue life and improvement of crack resistance can be obtained.
このように前記公報に開示された発明では、一次と二次の合計二段の熱処理（複合熱処理）を必要とする。しかしながら、かかる複合熱処理を単一の装置で行うと、必要工程が多数にのぼるために装置が大型化し、しかもこの大型装置が複合熱処理の専用設備となるため、熱処理コストが高騰してコストアップを招く要因となる。 As described above, the invention disclosed in the publication requires a total of two stages of heat treatment (composite heat treatment) of primary and secondary. However, if such a combined heat treatment is performed with a single apparatus, the number of necessary processes is increased, resulting in an increase in the size of the apparatus, and this large apparatus becomes a dedicated facility for the combined heat treatment. It becomes an inviting factor.
そこで、上記複合熱処理を低コストに行うことのできる熱処理システムの提供を目的とする。 Then, it aims at provision of the heat processing system which can perform the said composite heat processing at low cost.
この目的を達成するため、本発明にかかる熱処理システムは、鋼製部品を、Ａ1変態点を越える温度に加熱した後、Ａ1変態点未満に冷却して表面に窒素富化層を形成する一次熱処理装置と、Ａ1変態点を越えかつ一次熱処理での加熱温度未満に加熱した後、Ａ1変態点未満に冷却する二次熱処理装置とを備え、一次熱処理装置の後段に二次熱処理装置を選択的に連結可能としたものである。 To this end, heat treatment system according to the present invention, the steel parts, after heating to a temperature above the A 1 transformation point, to form a nitrogen-enriched layer on the surface by cooling to below the A 1 transformation point A primary heat treatment apparatus, and a secondary heat treatment apparatus that is heated to a temperature that exceeds the A 1 transformation point and lower than the heating temperature in the primary heat treatment and then cools to a temperature that is less than the A 1 transformation point. Are selectively connectable.
この熱処理システムによれば、一次熱処理装置の後段に二次熱処理装置を選択的に連結可能としているので、一次熱処理装置および二次熱処理装置としての既存設備を使用することにより、上記複合熱処理を実現することができる。また、一次熱処理装置と二次熱処理装置を連結した状態で使用する他、使用者の意思に応じて両者を非連結状態とし、一次熱処理装置および二次熱処理装置のそれぞれで各熱処理を単独で行うことができる。従って、多種多様の熱処理を共通のシステムで行うことができ、各処理をそれぞれの専用設備で行う場合に比べ、設備投資を減じて低コスト化を図ることが可能となる。 According to this heat treatment system, the secondary heat treatment apparatus can be selectively connected to the subsequent stage of the primary heat treatment apparatus, so the above combined heat treatment is realized by using the existing equipment as the primary heat treatment apparatus and the secondary heat treatment apparatus. can do. In addition to using the primary heat treatment apparatus and the secondary heat treatment apparatus in a connected state, they are disconnected from each other according to the user's intention, and each heat treatment is performed independently in each of the primary heat treatment apparatus and the secondary heat treatment apparatus. be able to. Therefore, it is possible to perform a wide variety of heat treatments with a common system, and it is possible to reduce the capital investment and reduce the cost as compared with the case where each process is performed with each dedicated facility.
例えば一次熱処理装置の後段に二次熱処理装置を連結した場合、まず一次熱処理装置での熱処理により、鋼製部品の表面に窒素が拡散した窒素富化層が形成される。この窒素富化層は、窒素の固溶や炭窒化物の形成を通じて鋼製部品の表面硬度向上に寄与する。この一次熱処理後は鋼組織中のオーステナイト粒が粗大化しているが、その後に二次熱処理装置で一次熱処理での加熱温度（一次加熱温度）よりも低温で熱処理を行えば、オーステナイト粒が微細化されるため、オーステナイト結晶粒度番号でいえば１０番を越える微細な結晶粒度が得られる。以上の特性から、処理後の鋼製部品の耐摩耗性や耐割れ性を向上させ、さらに転動疲労寿命の大幅な向上を図ることができる。 For example, when a secondary heat treatment apparatus is connected to the subsequent stage of the primary heat treatment apparatus, first, a nitrogen-enriched layer in which nitrogen diffuses is formed on the surface of the steel part by heat treatment in the primary heat treatment apparatus. This nitrogen-enriched layer contributes to the improvement of the surface hardness of steel parts through the solid solution of nitrogen and the formation of carbonitrides. After this primary heat treatment, the austenite grains in the steel structure are coarsened. However, if the heat treatment is performed at a temperature lower than the heating temperature (primary heating temperature) in the primary heat treatment in the secondary heat treatment device, the austenite grains become finer. Therefore, a fine grain size exceeding 10 is obtained in terms of the austenite grain size number. From the above characteristics, it is possible to improve the wear resistance and crack resistance of the steel parts after treatment, and to further improve the rolling fatigue life.
その一方、一次熱処理装置を単独で使用する場合は、鋼製部品の表面に窒素富化層を形成するための浸炭窒化装置として使用することができる他、雰囲気ガスの組成を変えることで、通常の焼入れなど、他の熱処理を行う装置としても使用することができる。また、二次熱処理装置についても単独で使用する場合は、焼入れの他、焼鈍しや焼ならし等の他の熱処理装置として使用することもできる。 On the other hand, when the primary heat treatment apparatus is used alone, it can be used as a carbonitriding apparatus for forming a nitrogen-enriched layer on the surface of steel parts, and it is usually possible to change the composition of the atmospheric gas. It can also be used as an apparatus for performing other heat treatment such as quenching. Further, when the secondary heat treatment apparatus is used alone, it can be used as another heat treatment apparatus such as annealing and normalizing in addition to quenching.
Ａ1変態点を越える温度に加熱して熱処理する場合、焼入れ後の焼割れ防止のため、焼戻しが不可欠となる。従って、一次熱処理装置を単独で使用する場合、その後段には焼戻し機を配置する必要がある。一方、一次熱処理後に二次熱処理を行う場合、上記焼戻し機の後段に二次熱処理装置を連結することも考えられるが、一次熱処理後の鋼製部品が直ぐに二次熱処理装置でオーステナイト化温度以上に再加熱されるであれば、一次熱処理後の焼戻しは不要である。従って、二次焼入れ装置は、一次熱処理装置よりも後で、かつ一次熱処理後の焼戻しを行う焼戻し機よりも前に連結するのが望ましく、これにより一次熱処理装置のみを使用する場合は焼戻しを行って焼割れを防止する一方、一次熱処理と二次熱処理の双方を施す場合には、一次熱処理後の焼戻しを省略して熱処理コストを抑制することができる。 When heat treatment is performed by heating to a temperature exceeding the A 1 transformation point, tempering is indispensable to prevent tempering cracks after quenching. Therefore, when the primary heat treatment apparatus is used alone, it is necessary to arrange a tempering machine in the subsequent stage. On the other hand, when performing the secondary heat treatment after the primary heat treatment, it is conceivable to connect a secondary heat treatment apparatus to the subsequent stage of the tempering machine, but the steel parts after the primary heat treatment immediately exceed the austenitizing temperature in the secondary heat treatment apparatus. If reheated, tempering after the primary heat treatment is unnecessary. Therefore, it is desirable that the secondary quenching apparatus be connected after the primary heat treatment apparatus and before the tempering machine for performing the tempering after the primary heat treatment, so that when only the primary heat treatment apparatus is used, tempering is performed. On the other hand, when both the primary heat treatment and the secondary heat treatment are performed, tempering after the primary heat treatment can be omitted and the heat treatment cost can be suppressed.
一次熱処理装置および二次熱処理装置の何れも、Ａ1変態点以上に加熱するための加熱機と、その後にＡ1変態点未満に冷却するための冷却機を基本構成として含む。但し加熱機と冷却機に限られるものではなく、両装置には、例えば冷却機で使用する焼入れ液の種類に応じて（油やソルトを使用する場合等）、部品表面に付着した焼入れ液を除去するための洗浄機を含めることもできる。 Any of the primary heat treatment apparatus and the secondary heat treatment apparatus also includes a heater for heating above the A 1 transformation point, then cooler for cooling to below the A 1 transformation point as the basic configuration. However, it is not limited to a heater and a cooler. For both devices, for example, depending on the type of quenching liquid used in the cooler (when using oil or salt, etc.) A washer for removal can also be included.
一次熱処理装置では、上述のようにＡ1変態点を越えて加熱することによって鋼の表面に窒素富化層が形成される。この加熱条件を満たす窒素富化層の形成手段としては、浸炭窒化処理が考えられ、コスト面や品質面を考慮すると特にガス浸炭窒化が好ましい。この場合、一次熱処理装置の加熱機としては、浸炭性ガスにアンモニアを添加した雰囲気ガスで加熱する雰囲気炉を使用することができる。 In the primary heat treatment apparatus, as described above, a nitrogen-enriched layer is formed on the steel surface by heating beyond the A 1 transformation point. As a means for forming the nitrogen-enriched layer that satisfies this heating condition, carbonitriding is conceivable, and gas carbonitriding is particularly preferable in view of cost and quality. In this case, as a heater of the primary heat treatment apparatus, an atmospheric furnace that is heated with an atmospheric gas obtained by adding ammonia to a carburizing gas can be used.
以上のように、本発明によれば、多種多様の熱処理を行う場合でも一つのシステムで対応することができるので、個々の熱処理ごとに専用設備を設置する場合に比べて設備投資を減じることができ、熱処理コストの削減による低コスト化を図ることが可能となる。また、多品種少量生産に対し、フレキシブルに対応できる熱処理システムを構築することができる。 As described above, according to the present invention, even when a wide variety of heat treatments are performed, it is possible to cope with one system, so that the capital investment can be reduced compared to the case where dedicated equipment is installed for each heat treatment. Therefore, it is possible to reduce the cost by reducing the heat treatment cost. In addition, it is possible to construct a heat treatment system that can flexibly cope with small-lot production of various products.
以下、鋼製部品の一例として軸受部品を使用し、これに適用した本発明の一実施形態を説明する。 Hereinafter, an embodiment of the present invention applied to a bearing component as an example of a steel component will be described.
図１に本発明にかかる熱処理システムの構成を概念的に示す。図示のように、この熱処理システムは、一次熱処理装置１と二次熱処理装置２とを主要構成要素として含む。鍛造→旋削等の成形工程（図示せず）で成形された軸受部品は、一次熱処理装置１もしくは二次熱処理装置２の何れか一方のみ、または一次熱処理装置１を経て二次熱処理装置２に移送され、それぞれの装置で加熱・冷却されて熱処理が施される。 FIG. 1 conceptually shows the configuration of a heat treatment system according to the present invention. As illustrated, this heat treatment system includes a primary heat treatment apparatus 1 and a secondary heat treatment apparatus 2 as main components. Bearing parts formed in a forming process (not shown) such as forging → turning are transferred to either the primary heat treatment apparatus 1 or the secondary heat treatment apparatus 2 or to the secondary heat treatment apparatus 2 via the primary heat treatment apparatus 1. Then, each apparatus is heated and cooled to be subjected to heat treatment.
ここでいう軸受部品は、玉軸受、円錐ころ軸受、ころ軸受、針状ころ軸受等の転がり軸受の軸受部品を意味する。図２は、一例として外輪４１、内輪４２、および転動体４３を主要な構成要素とする深溝玉軸受４を示すものであり、これら外輪４１、内輪４２、および転動体４３がここでいう軸受部品に該当する。これら軸受部品の素材としては、ＳＵＪ２等の軸受鋼の他、Ｃ：０．６〜１．３ｗｔ％、Ｓｉ：０．３〜３．０ｗｔ％、Ｍｎ：０．２〜１．５ｗｔ％、Ｃｒ：０．３〜５．０ｗｔ％、Ｎｉ：０．１〜３ｗｔ％を含む（望ましくはＭｏ：０．０５〜０．２５ｗｔ％未満、Ｖ：０．０５〜１．０ｗｔ％をさらに含む）高温用の軸受鋼や、Ｃ：０．４〜０．８ｗｔ％、Ｓｉ：０．２〜０．９ｗｔ％、Ｍｎ：０．７〜１．３ｗｔ％、Ｃｒ：０．７ｗｔ％以下を含む中炭素鋼等も使用することができる。 The bearing component here means a bearing component of a rolling bearing such as a ball bearing, a tapered roller bearing, a roller bearing, or a needle roller bearing. FIG. 2 shows, as an example, a deep groove ball bearing 4 having an outer ring 41, an inner ring 42, and a rolling element 43 as main components, and the outer ring 41, the inner ring 42, and the rolling element 43 are the bearing parts referred to here. It corresponds to. As materials for these bearing parts, in addition to bearing steel such as SUJ2, C: 0.6 to 1.3 wt%, Si: 0.3 to 3.0 wt%, Mn: 0.2 to 1.5 wt%, Cr : 0.3 to 5.0 wt%, Ni: 0.1 to 3 wt% (desirably Mo: 0.05 to less than 0.25 wt%, V: 0.05 to 1.0 wt% further included) Bearing steel and medium carbon containing C: 0.4-0.8 wt%, Si: 0.2-0.9 wt%, Mn: 0.7-1.3 wt%, Cr: 0.7 wt% or less Steel or the like can also be used.
一次熱処理装置１は、加熱機１１、冷却機１２、および洗浄機１３で構成される。図１では、一次熱処理装置１として連続式を例示しているが、バッチ式を使用することもできる。加熱機１１は、例えば浸炭性ガスにアンモニアを添加した雰囲気炉で構成される。この加熱機１１内では、軸受部品が図３に示すようにＡ1変態点を越える温度Ｔ１（８００℃〜９００℃、例えば８５０℃）で例えば４０分程度加熱され（一次加熱）、これにより活性状態の窒素が表層に拡散して軸受部品の表層が硬化される（ガス浸炭窒化）。加熱機１１は、基本的には表面に窒素富化層を形成することを目的とするから、少なくとも窒化すればよく、必ずしも浸炭は必要でない。但し、条件によっては、例えば脱炭が懸念される場合や使用鋼材の炭素量が少なく、十分な硬度を確保できない場合等は、窒化の他に浸炭も不可欠となる。加熱後の軸受部品は、図３に示すように冷却機１２にてＭｓ点以下に冷却（例えば油冷）され、さらに洗浄機１３に移送されて冷却液の洗浄除去が行われる。 The primary heat treatment apparatus 1 includes a heater 11, a cooler 12, and a washing machine 13. In FIG. 1, although the continuous type is illustrated as the primary heat treatment apparatus 1, a batch type can also be used. The heater 11 is composed of an atmospheric furnace in which ammonia is added to a carburizing gas, for example. In this heater 11, the bearing components are heated for about 40 minutes (primary heating) at a temperature T1 (800 ° C. to 900 ° C., for example, 850 ° C.) exceeding the A 1 transformation point as shown in FIG. The nitrogen in the state diffuses into the surface layer, and the surface layer of the bearing component is hardened (gas carbonitriding). Since the heater 11 is basically intended to form a nitrogen-enriched layer on the surface, it may be at least nitrided and carburization is not necessarily required. However, depending on the conditions, for example, when decarburization is a concern or when the amount of carbon in the steel used is small and sufficient hardness cannot be ensured, carburizing is indispensable in addition to nitriding. As shown in FIG. 3, the heated bearing component is cooled to the Ms point or less by the cooler 12 (for example, oil-cooled), and further transferred to the washing machine 13 for washing and removing the coolant.
図１に示すように、前工程から搬送された軸受部品Ａは、一次熱処理装置１で浸炭窒化された後、二工程のうちの何れか一方の工程に選択移送される。一方は焼戻し工程であり、この焼戻しは一時熱処理装置１の後段に配置した焼戻し機５で行われる。この焼戻し機５を経た軸受部品は、浸炭窒化品Ｂとなる。 As shown in FIG. 1, the bearing part A conveyed from the previous process is carbonitrided by the primary heat treatment apparatus 1 and then selectively transferred to one of the two processes. One is a tempering step, and this tempering is performed by a tempering machine 5 disposed at a subsequent stage of the temporary heat treatment apparatus 1. The bearing component that has undergone the tempering machine 5 becomes a carbonitrided product B.
他方は二次加熱工程であり、一次熱処理装置１を経た軸受部品Ａ’は、コンベヤ等の搬送手段３を介して二次熱処理装置２に移送される。この搬送手段３の上流側は一次熱処理装置１と焼戻し機５の間に、下流側は二次加熱装置２の入口にそれぞれ接続されており、これにより二次熱処理装置２が一次熱処理装置１よりも後段で焼戻し機５よりも前段に連結される。搬送手段３は常設され、その上流端には、使用者の意思に応じて一次熱処理後の軸受部品を焼戻し機５と搬送手段３の何れか一方に振り分けるための振り分け手段６が配置される。 The other is a secondary heating step, and the bearing part A ′ that has passed through the primary heat treatment apparatus 1 is transferred to the secondary heat treatment apparatus 2 via a conveying means 3 such as a conveyor. The upstream side of the conveying means 3 is connected between the primary heat treatment apparatus 1 and the tempering machine 5, and the downstream side is connected to the inlet of the secondary heating apparatus 2, whereby the secondary heat treatment apparatus 2 is connected to the primary heat treatment apparatus 1. In the latter stage, it is connected to the front stage rather than the tempering machine 5. The conveying means 3 is permanently installed, and at the upstream end thereof, a distributing means 6 for distributing the bearing parts after the primary heat treatment to either the tempering machine 5 or the conveying means 3 according to the intention of the user is arranged.
二次熱処理装置２は、普通焼入れを行うもので、加熱機２１、冷却機２２、洗浄機２３、および焼戻し機２４で構成される。図１では、二次熱処理装置２として連続式を例示しているが、バッチ式を使用することもできる。加熱機２１では、図３に示すように、軸受部品Ａ’をＡ1変態点以上でかつ一次熱処理装置１での一次加熱温度Ｔ１未満の温度Ｔ２（７９０℃〜８３０℃、例えば８００℃）で例えば３０分程度加熱する（二次加熱）。この二次加熱温度は、一次加熱温度よりも低温であるで、一次加熱を経た鋼中のオーステナイト粒は微細化される。二次加熱後の軸受部品は、冷却機２２にて図３に示すようにＭｓ点以下に冷却（例えば油冷）され、さらに洗浄機２３に移送されて冷却液の洗浄除去が行われる。その後、この軸受部品は焼戻し機２４に移送され、図３に示すように適当な温度Ｔ３（例えば１８０℃）で焼戻すことにより、一次熱処理および二次熱処理を施した複合熱処理品Ｄが得られる。加熱機２１としては、電気抵抗炉、燃焼炉等の一般的な加熱炉の他、真空炉、塩浴炉、あるいは高周波加熱をはじめとする誘導加熱炉等を使用することもできる。なお、焼戻し機２４は、図１に示すように二次熱処理装置２と一体化する他、これと分離して設置することもできる。 The secondary heat treatment apparatus 2 performs normal quenching, and includes a heater 21, a cooler 22, a washing machine 23, and a tempering machine 24. In FIG. 1, a continuous type is illustrated as the secondary heat treatment apparatus 2, but a batch type can also be used. In the heater 21, as shown in FIG. 3, the bearing part A ′ is at a temperature T2 (790 ° C. to 830 ° C., for example, 800 ° C.) that is higher than the A 1 transformation point and lower than the primary heating temperature T1 in the primary heat treatment apparatus 1. For example, heating is performed for about 30 minutes (secondary heating). Since this secondary heating temperature is lower than the primary heating temperature, the austenite grains in the steel subjected to the primary heating are refined. The bearing parts after the secondary heating are cooled (for example, oil-cooled) to the Ms point or lower as shown in FIG. 3 by the cooler 22, and further transferred to the washing machine 23, where the coolant is washed and removed. Thereafter, the bearing parts are transferred to a tempering machine 24 and tempered at an appropriate temperature T3 (for example, 180 ° C.) as shown in FIG. 3 to obtain a composite heat-treated product D subjected to primary heat treatment and secondary heat treatment. . As the heater 21, a general heating furnace such as an electric resistance furnace or a combustion furnace, a vacuum furnace, a salt bath furnace, an induction heating furnace including high frequency heating, or the like can be used. The tempering machine 24 can be installed separately from the secondary heat treatment apparatus 2 as shown in FIG.
以上に述べた一次加熱温度Ｔ１、二次加熱温度Ｔ２、および焼戻し温度Ｔ３は何れも鋼材として軸受鋼ＳＵＪ２を使用する場合を例示したものである。使用鋼材の種類によっては、これらの温度Ｔ１、Ｔ２、Ｔ３は上記例示と異なる温度をとる場合がある。 The primary heating temperature T1, the secondary heating temperature T2, and the tempering temperature T3 described above exemplify the case where the bearing steel SUJ2 is used as the steel material. Depending on the type of steel used, these temperatures T1, T2, and T3 may be different from the above examples.
複合熱処理品Ｄでは、表層に窒素富化層（窒素含有量０．１〜０．７ｗｔ％）が形成されるため、Ｈｖ７００を越える高硬度が得られ、かつミクロ組織中のオーステナイト粒が微細化されてそのオーステナイト結晶粒度は１０番を越えるものとなる。また、破壊応力値２６５０ＭＰａ以上、鋼中の水素濃度０．５ｐｐｍ以下、残留オーステナイト量１３〜２５％という通常品を遥かに凌ぐ良好な物性値が得られる。従って、耐割れ強度、耐摩耗性等を向上させることができ、さらには転動疲労寿命の向上に顕著な効果が得られる。 In the composite heat-treated product D, a nitrogen-enriched layer (nitrogen content of 0.1 to 0.7 wt%) is formed on the surface layer, so that high hardness exceeding Hv700 is obtained and austenite grains in the microstructure are refined Thus, the austenite grain size exceeds # 10. In addition, good physical property values far exceeding conventional products such as a fracture stress value of 2650 MPa or more, a hydrogen concentration in steel of 0.5 ppm or less, and a retained austenite amount of 13 to 25% can be obtained. Accordingly, it is possible to improve the cracking resistance, wear resistance, etc., and to obtain a remarkable effect in improving the rolling fatigue life.
二次熱処理装置２は、一次熱処理装置１と組み合わせるだけでなく、それ自体単独で使用することもできる。すなわち、図１に示すように、鍛造→旋削等の成形工程（図示省略）で成形された軸受部品Ｃを二次熱処理装置２に供給することにより、普通焼入れを行って普通焼入れ品Ｅを製造することもできる。この場合、加熱機２１や冷却機の温度・時間等の熱処理条件を変更することにより、焼鈍しや焼ならし等の他の熱処理を行うこともできる。 The secondary heat treatment apparatus 2 can be used not only in combination with the primary heat treatment apparatus 1 but also by itself. That is, as shown in FIG. 1, a normal quenching product E is manufactured by performing normal quenching by supplying the bearing part C molded in a molding process (not shown) such as forging → turning to the secondary heat treatment apparatus 2. You can also In this case, other heat treatments such as annealing and normalization can be performed by changing the heat treatment conditions such as the temperature and time of the heater 21 and the cooler.
なお、以上の説明では、冷却機１２、２２での冷却方法として油冷を例示したが、塩浴や空冷等の他の冷却方法を採用することもでき、また、一次熱処理装置１と二次熱処理装置２で異なる冷却方法を採用することもできる。本実施形態では、何れの冷却機１２、２２でも油冷する関係で、冷却機１２、２２の後段に洗浄機１３、２３を設置しているが、水冷や空冷等の場合にはこの種の洗浄機は不要となる。 In the above description, oil cooling is exemplified as a cooling method in the coolers 12 and 22, but other cooling methods such as a salt bath and air cooling can also be adopted. Different cooling methods may be employed in the heat treatment apparatus 2. In the present embodiment, the washing machines 13 and 23 are installed in the subsequent stage of the cooling machines 12 and 22 because the oil cooling is performed in any of the cooling machines 12 and 22, but this kind of case is used in the case of water cooling or air cooling. No washing machine is required.
このように本発明では、一つのシステムで浸炭窒化品Ｂ、複合熱処理品Ｄ、および焼入れ品Ｅを選択的に製造することができる。従って、個々の熱処理品を専用設備で製造する場合に比べて設備投資を減じることができる。また、一次熱処理装置１および二次熱処理装置２としては既存設備を転用することができ、新規の設備は不要となる。以上から、多種多様の熱処理を単一システムで行うことができ、各熱処理をそれぞれの専用設備で行う場合に比べ、熱処理コストのを削減して軸受部品の低コスト化を図ることが可能となる。 Thus, in the present invention, the carbonitrided product B, the composite heat-treated product D, and the quenched product E can be selectively manufactured in one system. Therefore, it is possible to reduce the capital investment as compared with the case where individual heat treatment products are manufactured with dedicated equipment. Moreover, the existing equipment can be diverted as the primary heat treatment apparatus 1 and the secondary heat treatment apparatus 2, and new equipment becomes unnecessary. From the above, it is possible to perform a wide variety of heat treatments with a single system, and it is possible to reduce the heat treatment costs and reduce the cost of bearing parts compared to the case where each heat treatment is performed with each dedicated equipment. .
なお、以上の説明では熱処理の対象として軸受部品を例示したが、本発明はこれに限らず、高い転動疲労寿命が要求される機械部品（例えば等速自在継手の構成部品）、さらには鋼製部品一般に広く適用することができる。 In the above description, bearing parts are exemplified as heat treatment targets. However, the present invention is not limited to this, and mechanical parts (for example, components of constant velocity universal joints) that require a high rolling fatigue life, and steel are also included. Can be widely applied to manufactured parts in general.
１ 一次熱処理装置
２ 二次熱処理装置
３ 搬送手段
４ 転がり軸受
５ 焼戻し機
６ 振り分け手段
１１ 加熱機（一次加熱）
１２ 冷却機
１３ 洗浄機
２１ 加熱機（二次加熱）
２２ 冷却機
２３ 洗浄機
２４ 焼戻し機
４１ 外輪
４２ 内輪
４２ 転動体
DESCRIPTION OF SYMBOLS 1 Primary heat processing apparatus 2 Secondary heat processing apparatus 3 Conveying means 4 Rolling bearing 5 Tempering machine 6 Sorting means 11 Heating machine (primary heating)
12 Cooling machine 13 Washing machine 21 Heating machine (secondary heating)
22 Cooling machine 23 Washing machine 24 Tempering machine 41 Outer ring 42 Inner ring 42 Rolling element
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011508073A (en) * | 2007-12-20 | 2011-03-10 | ポスコ | Steel wire for bearing, method for producing steel wire for bearing, heat treatment method for bearing, and soaking diffusion treatment method for bearing and cast slab for bearing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011508073A (en) * | 2007-12-20 | 2011-03-10 | ポスコ | Steel wire for bearing, method for producing steel wire for bearing, heat treatment method for bearing, and soaking diffusion treatment method for bearing and cast slab for bearing |
| US9593389B2 (en) | 2007-12-20 | 2017-03-14 | Posco | Steel wire rod for bearing steel, manufacturing method of steel wire rod for bearing steel, heat treatment method of steel bearing, steel bearing and soaking method of bearing steel |
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