JP4582339B2 - High frequency heat treatment apparatus and heat treatment method - Google Patents

High frequency heat treatment apparatus and heat treatment method Download PDF

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JP4582339B2
JP4582339B2 JP2006085464A JP2006085464A JP4582339B2 JP 4582339 B2 JP4582339 B2 JP 4582339B2 JP 2006085464 A JP2006085464 A JP 2006085464A JP 2006085464 A JP2006085464 A JP 2006085464A JP 4582339 B2 JP4582339 B2 JP 4582339B2
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conducting wire
heat treatment
workpiece
winding shape
constant radius
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JP2007262437A (en
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宏治 松原
朋宏 高尾
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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
    • 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
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Description

本発明は、金属製品の熱処理技術に関するものである。   The present invention relates to a heat treatment technique for metal products.

クランクシャフト等、所定の機械的性質を得るための熱処理工程を必要とする金属製品の場合、熱処理工程を経ていない製品が誤流出してしまうことを防ぐために、熱処理済みか否かの確認作業が必要不可欠となっている。この確認作業を確実に行う手法として、例えば、製品を撮影して画像処理を施すことにより、製品の焼き色の有無を自動判別する手法（例えば、特許文献１参照。）や、熱処理工程が完了していることを示す熱処理済み標として、製品上に刻印やインク塗布を行い、それらの熱処理済み標を目視確認する手法があげられる。   In the case of a metal product that requires a heat treatment process for obtaining predetermined mechanical properties, such as a crankshaft, it is necessary to confirm whether or not the heat treatment has been completed in order to prevent a product that has not undergone the heat treatment process from being accidentally leaked. It is indispensable. As a method for surely performing this confirmation work, for example, a method of automatically determining the presence or absence of a baked color of a product by photographing the product and performing image processing (see, for example, Patent Document 1) or a heat treatment process is completed. As a heat-treated mark indicating that the heat treatment has been performed, there is a technique in which marking or ink application is performed on the product and the heat-treated mark is visually confirmed.

特開平１１−３１５７９号公報JP 11-31579 A

しかしながら、製品の焼き色の有無を自動判別する手法は、判別装置にコストがかかる点や、熱処理工程後に製品の焼き色が明確に現れないような場合には用いることができない、といった欠点が問題となっていた。一方、製品上に刻印やインク塗布を行う手法の場合には、熱処理設備とは別に刻印用の設備を設けて刻印作業を行うことによるコストの発生や、刻印の有無の判別が比較的判り難く、更には、熱処理を経ていない製品に対しても誤って刻印を施してしまうことを確実に防ぐ必要がある、等々の諸問題が指摘されていた。他方、インク塗布の場合も、インク塗布用の設備の設置及び塗布作業によるコストが発生する点や、設備内のインク汚れを定期的に洗浄する必要がある点、更には、インク切れによるインクの未塗布品の流出を確実に防ぐ必要がある、等々の諸問題が指摘されていた。   However, the method of automatically determining whether or not the product has a baked color has problems such as the cost of the discriminating apparatus and the disadvantage that it cannot be used when the product baked color does not appear clearly after the heat treatment process. It was. On the other hand, in the case of the method of engraving and applying ink on the product, it is relatively difficult to determine the cost and the determination of the presence or absence of engraving by providing engraving equipment separately from the heat treatment equipment. Furthermore, it has been pointed out that various problems have been pointed out, for example, that it is necessary to reliably prevent a product that has not undergone heat treatment from being imprinted by mistake. On the other hand, in the case of ink application, there are costs associated with installation and application work of ink application equipment, the need to regularly clean ink stains within the equipment, Various problems have been pointed out that it is necessary to reliably prevent the uncoated product from flowing out.

本発明は上記課題に鑑みてなされたものであり、その目的とするところは、ワークが、熱処理済みであるか否かの判別を、設備コストや作業コストを生じることなく、容易かつ確実に行うことにある。   The present invention has been made in view of the above problems, and the object of the present invention is to easily and surely determine whether or not the work has been heat-treated without incurring equipment costs or work costs. There is.

上記課題を解決するための、本発明に係る高周波熱処理装置は、導線の巻き線形状が一定半径筒状の部分と、前記一定半径筒状の部分よりワークの表面に導線が接近するように、前記一定半径筒状の部分に対し導線の巻き線形状が不連続に形成された部分と、を有するインダクションコイルを備えることを特徴とするものである。
本発明によれば、ワークの高周波加熱を行う際に、インダクションコイルの、一定半径筒状の部分に対し導線の巻き線形状が不連続に形成された部分が、ワークの一定半径筒状の部分よりワーク表面に接近することで、かかる特定部分の近傍において、コイルの磁界によりワークに発生する渦電流が増加し、その部分に発生するジュール熱が増大する。よって、ワークの熱処理が必要な部位に対する加熱と同時進行で、ワークの特定部分を酸化温度以上に加熱し、着色させることが可能となる。そして、特定部分が酸化により着色されることで、熱処理工程が完了しているか否かを、目視により容易かつ確実に識別することが可能となる。 In order to solve the above problems, the high-frequency heat treatment apparatus according to the present invention is such that the winding shape of the conducting wire is a constant radius cylindrical portion, and the conducting wire approaches the surface of the workpiece from the constant radius cylindrical portion. An induction coil having a portion in which a winding shape of a conducting wire is discontinuously formed with respect to the constant radius cylindrical portion is provided.
According to the present invention, when high-frequency heating of a workpiece is performed, the portion of the induction coil in which the winding shape of the conductive wire is discontinuously formed with respect to the constant-radius cylindrical portion is the constant-radius cylindrical portion of the workpiece. By approaching the workpiece surface more, eddy current generated in the workpiece due to the magnetic field of the coil increases in the vicinity of the specific portion, and Joule heat generated in the portion increases. Therefore, the specific part of the work can be heated to the oxidation temperature or higher and colored at the same time as the heating of the part requiring heat treatment of the work. And it becomes possible to identify easily and reliably visually whether the heat processing process is completed because the specific part is colored by oxidation.

又、本発明においては、前記導線の巻き線形状が不連続に形成された部分に係る導線は、前記一定半径筒状の部分の、円周上の二点を一直線につないだ巻き線形状に形成されていることが望ましい。
この構成によれば、コイルを構成する導線の、円周上の二点を一直線につなぐ部分がワークの特定部分の表面に最接近し、かかる特定部分の近傍において、コイルの磁界によりワークに発生する渦電流が増加し、その部分に発生するジュール熱が増大する。よって、ワークの熱処理が必要な部位に対する加熱と同時進行で、ワークの特定部分を酸化温度以上に加熱し、着色させることが可能となる。そして、特定部分が酸化により着色されることで、熱処理工程が完了しているか否かを、目視により容易かつ確実に識別することが可能となる。 Moreover, in this invention, the conducting wire which concerns on the part in which the winding shape of the said conducting wire was formed discontinuously was made into the winding shape which connected two points on the circumference of the said constant radius cylindrical part in a straight line. It is desirable that it be formed.
According to this configuration, the part of the conducting wire constituting the coil that connects two points on the circumference in a straight line is closest to the surface of the specific part of the work, and is generated in the work by the magnetic field of the coil in the vicinity of the specific part. Eddy current increases, and Joule heat generated in the portion increases. Therefore, the specific part of the work can be heated to the oxidation temperature or higher and colored at the same time as the heating of the part requiring heat treatment of the work. And it becomes possible to identify easily and reliably visually whether the heat processing process is completed because the specific part is colored by oxidation.

又、本発明においては、前記導線の巻き線形状が一定半径筒状の部分に係る導線と、前記導線の巻き線形状が不連続に形成された部分に係る導線とは、一体に構成されているものである。
本発明のごとく、導線の巻き線形状が一定半径筒状の部分に係る導線と、導線の巻き線形状が不連続に形成された部分に係る導線とが一体に構成されている場合には、インダクションコイルの構成部品数が少なくなり、構造の単純化が図られる。 Further, in the present invention, the conducting wire related to the portion where the winding shape of the conducting wire has a constant radius cylindrical shape and the conducting wire related to the portion where the winding shape of the conducting wire is formed discontinuously are integrally configured. It is what.
As in the present invention, in the case where the conductive wire related to the portion where the winding shape of the conductive wire is a constant radius cylinder and the conductive wire related to the portion where the winding shape of the conductive wire is formed discontinuously are integrally configured, The number of components of the induction coil is reduced, and the structure is simplified.

又、本発明においては、前記導線の巻き線形状が一定半径筒状の部分に係る導線と、前記導線の巻き線形状が不連続に形成された部分に係る導線とは、別体に構成され連結されていることとしても良い。
このように、導線の巻き線形状が一定半径筒状の部分に係る導線と、導線の巻き線形状が不連続に形成された部分に係る導線とが、別体に構成され連結されている場合には、それぞれの部分を別工程で製造することが可能となるので、製造が容易となり、なおかつ、各形状部分をユニット化して組合せることで、様々なワーク形状にも柔軟に対応することが可能となる。 Further, in the present invention, the conducting wire related to the portion where the winding shape of the conducting wire has a constant radius cylindrical shape and the conducting wire related to the portion where the winding shape of the conducting wire is formed discontinuously are configured separately. It is good also as being connected.
Thus, when the conducting wire related to the portion where the winding shape of the conducting wire has a constant radius and the conducting wire related to the portion where the winding shape of the conducting wire is formed discontinuously are configured and connected separately. Since each part can be manufactured in a separate process, manufacturing is easy, and various shape parts can be flexibly supported by combining each shape part as a unit. It becomes possible.

又、上記課題を解決するための、本発明に係る熱処理方法は、ワークの熱処理が必要な部位に対するインダクションコイルを用いた加熱と同時進行で、前記ワークの熱処理が必要な部位とは異なる特定部位に対し、前記インダクションコイルを構成する導線の一部分を、前記ワークの熱処理が必要な部位より接近させ、前記特定部位を酸化色が付く温度へと加熱することを特徴とするものである。
本発明によれば、インダクションコイルを構成する導線の一部分をワークの特定部位に対し接近させることで、かかる特定部分の近傍において、コイルの磁界によりワークに発生する渦電流を増加させ、その部分に発生するジュール熱を増大させる。よって、ワークの熱処理が必要な部位に対する加熱と同時進行で、ワークの特定部分を酸化温度以上に加熱し、着色させることが可能となる。そして、特定部分が酸化により着色されることで、熱処理工程が完了しているか否かを、目視により容易かつ確実に識別することが可能となる。この際、ワークの熱処理が必要な部位については、所望の加熱温度を超えることはない。 In addition, the heat treatment method according to the present invention for solving the above-described problem is a specific part different from the part requiring heat treatment of the workpiece, simultaneously with the heating using the induction coil for the part requiring heat treatment of the workpiece. On the other hand, a part of the conducting wire constituting the induction coil is brought closer to a part where heat treatment of the workpiece is required, and the specific part is heated to a temperature at which an oxidation color is given.
According to the present invention, by bringing a part of the conducting wire constituting the induction coil closer to a specific part of the work, an eddy current generated in the work by the magnetic field of the coil is increased in the vicinity of the specific part. Increases the generated Joule heat. Therefore, the specific part of the work can be heated to the oxidation temperature or higher and colored at the same time as the heating of the part requiring heat treatment of the work. And it becomes possible to identify easily and reliably visually whether the heat processing process is completed because the specific part is colored by oxidation. At this time, a desired heating temperature is not exceeded for a portion that requires heat treatment of the workpiece.

本発明はこのように構成したので、熱処理製品が、熱処理済みであるか否かの判別を、設備コストや作業コストを生じることなく、容易かつ確実に行うことが可能となる。   Since this invention was comprised in this way, it becomes possible to discriminate | determine whether the heat processing product has been heat-processed easily and reliably, without producing installation cost and work cost.

以下、本発明を実施するための最良の形態を添付図面に基づいて説明する。
なお、本説明では、図３に示されるように、ワークＷの具体例としてクランクシャフトが挙げられている。又、熱処理として、このワークＷに焼戻しを行う場合が例示されている。
本発明の実施の形態に係る高周波熱処理装置１０は、図１に示されるように、高周波発信器１２、トランス１４及びインダクションコイル１６を備えている。又、インダクションコイル１６は、導線の巻き線形状が一定半径筒状の部分１６Ａと、一定半径筒状の部分１６Ａに対し導線の巻き線形状が不連続に形成された部分１６Ｂと、を有している。導線の巻き線形状が不連続に形成された部分１６Ｂは、ワークＷの、焼戻しが必要な部位（図３の例では、クランクピンＷａ）を除く特定部位の表面に対し、導線が最接近する（ワーク表面と導線との距離が、他の部位に比べ最も接近する）ような形状に形成されている。この特定部位は、酸化温度以上に加熱されても支障を生じない部分であることが望ましく、図３の例では、クランクシャフトＷｂが特定部位となっている。なお、図１において符号１６ａで示される部分は、熱処理の際に生じる導線の振動を抑制するためのステーである。導線は、このステー１６ａに対し、複数のボルト１７によって固定されている。 The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
In this description, as shown in FIG. 3, a crankshaft is cited as a specific example of the workpiece W. Moreover, the case where this workpiece | work W is tempered as heat processing is illustrated.
As shown in FIG. 1, the high-frequency heat treatment apparatus 10 according to the embodiment of the present invention includes a high-frequency transmitter 12, a transformer 14, and an induction coil 16. Further, the induction coil 16 has a portion 16A in which the winding shape of the conducting wire is a constant radius cylindrical portion, and a portion 16B in which the winding shape of the conducting wire is formed discontinuously with respect to the constant radius cylindrical portion 16A. ing. In the portion 16B where the winding shape of the conducting wire is formed discontinuously, the conducting wire is closest to the surface of a specific portion of the work W excluding a portion that requires tempering (in the example of FIG. 3, the crank pin Wa). (The distance between the workpiece surface and the conductive wire is closest to other parts). This specific part is desirably a part that does not cause any trouble even when heated to an oxidation temperature or higher. In the example of FIG. 3, the crankshaft Wb is the specific part. In addition, the part shown with the code | symbol 16a in FIG. 1 is a stay for suppressing the vibration of the conducting wire which arises in the case of heat processing. The conducting wire is fixed to the stay 16a by a plurality of bolts 17.

本発明の実施の形態では、導線の巻き線形状が不連続に形成された部分１６Ｂに係る導線は、図２に示されるように、一定半径筒状の部分１６Ａと同一半径の円弧状の導線１８と、円弧状の導線１８の円周上の二点を一直線につなぐ直線状の導線２０とからなる巻き線形状に形成されている。そして、ワークＷに焼戻しを行う際には、図１に示されるように、インダクションコイル１６内部の所定位置へとワークＷがセットされることで、導線の巻き線形状が不連続に形成された部分１６Ｂの、直線状の導線２０が、クランクシャフトＷｂの表面に最接近するようになっている。   In the embodiment of the present invention, as shown in FIG. 2, the conducting wire related to the portion 16B in which the winding shape of the conducting wire is formed discontinuously is an arcuate conducting wire having the same radius as the constant radius cylindrical portion 16A. 18 and a linear conductor 20 that connects two points on the circumference of the arc-shaped conductor 18 in a straight line. When the work W is tempered, as shown in FIG. 1, the work W is set to a predetermined position inside the induction coil 16, so that the winding shape of the conducting wire is formed discontinuously. The straight conducting wire 20 of the portion 16B is closest to the surface of the crankshaft Wb.

本発明の実施の形態におけるワークＷの焼戻し作業は、図４に示される手順で行われる。まず、受渡ステーション２２から、高周波熱処理装置１０が設けられている加熱ステーション２４へとワークＷが搬入され（矢印（i）、（ii））、加熱ステーション２４において、ワークＷが加熱される。加熱されたワークＷｈは、加熱ステーション２４から冷却ステーション２６へと搬送され（矢印（iii）、（iv）、（v））、冷却ステーション２６において冷却される。冷却されたワークＷｃは、冷却ステーション２６から、再び受渡ステーション２２へと搬送される（矢印（vi）、（vii））。なお、上記各ステーションへのワークの搬入出は、コンベヤ、トレー、ロボット等、必要に応じ様々な搬送手段により行うことができる。   The tempering operation of the workpiece W in the embodiment of the present invention is performed according to the procedure shown in FIG. First, the workpiece W is carried from the delivery station 22 to the heating station 24 in which the high-frequency heat treatment apparatus 10 is provided (arrows (i) and (ii)), and the workpiece W is heated in the heating station 24. The heated workpiece Wh is conveyed from the heating station 24 to the cooling station 26 (arrows (iii), (iv), and (v)), and is cooled in the cooling station 26. The cooled workpiece Wc is conveyed again from the cooling station 26 to the delivery station 22 (arrows (vi) and (vii)). It should be noted that the work can be carried into and out of each station by various conveying means such as a conveyor, a tray, and a robot as required.

図５には、高周波熱処理装置１０によって加熱されたワークＷの、焼戻しが必要な部位（クランクピンＷａ）の温度変化を符号Ｔａで、焼戻しが必要な部位を除く特定部位（クランクシャフトＷｂ）の温度変化を符号Ｔｂで示している。図中、縦軸は温度Ｔ（℃）を、横軸は時間ｔ（ｓ）を表している。図５から明らかなように、焼戻しが必要な部位の温度を酸化温度Ｔo以下でかつ焼戻しに必要な温度（２５０〜３００℃以上）に加熱する際に、特定部位が酸化温度Ｔoを超え、図６に符号５０で示される酸化色（模式的に網目で示す）が付くような温度（３００℃以上）へと、特定部位を加熱することが可能となる。なお、酸化色は、目視確認が可能な程度に付されていれば良く、色むら等の発生は、判別作業の際、特に問題とはならない。   In FIG. 5, the temperature change of a part (crank pin Wa) that requires tempering of the workpiece W heated by the high-frequency heat treatment apparatus 10 is indicated by a symbol Ta, and the specific part (crankshaft Wb) excluding the part that requires tempering is shown. A temperature change is indicated by a symbol Tb. In the figure, the vertical axis represents temperature T (° C.) and the horizontal axis represents time t (s). As is clear from FIG. 5, when the temperature of the part requiring tempering is heated to the oxidation temperature To or lower and the temperature necessary for tempering (250 to 300 ° C. or higher), the specific part exceeds the oxidation temperature To, The specific portion can be heated to a temperature (300 ° C. or higher) at which the oxidation color (schematically indicated by a mesh) indicated by reference numeral 50 in FIG. It should be noted that the oxidized color only needs to be attached to such an extent that it can be visually confirmed, and the occurrence of color unevenness is not particularly problematic during the discrimination operation.

上記構成を有する本発明の実施の形態によれば、次のような作用効果を得ることが可能となる。
まず、インダクションコイル１６の、一定半径筒状の部分１６Ａに対し導線の巻き線形状が不連続に形成された部分１６Ｂが、一定半径筒状の部分１６Ａよりワークの特定部分Ｗｂの表面に接近することで、かかる特定部分Ｗｂの近傍において、コイルの磁界によりワークＷに発生する渦電流が増加し、その部分に発生するジュール熱が増大する。よって、ワークＷの熱処理が必要な部位Ｗａに対する加熱と同時進行で、ワークＷの特定部分Ｗｂを酸化温度以上に加熱し、酸化色を着色させることが可能となる。そして、特定部分Ｗｂが酸化により着色されることで、ワークＷが焼戻し工程を完了しているか否かの判別を、目視により容易かつ確実に識別することが可能となる。
よって、本発明の実施の形態によれば、従来の、製品の焼き色の有無を画像処理して自動判別する手法や、製品上に刻印やインク塗布を行う手法と異なり、ワークＷが、熱処理済みであるか否かの判別を、設備コストや作業コストを生じることなく、容易かつ確実に行うことが可能となる。 According to the embodiment of the present invention having the above-described configuration, the following operational effects can be obtained.
First, the portion 16B of the induction coil 16 in which the winding shape of the conductive wire is discontinuously formed with respect to the constant radius cylindrical portion 16A is closer to the surface of the specific portion Wb of the workpiece than the constant radius cylindrical portion 16A. Thus, in the vicinity of the specific portion Wb, eddy current generated in the workpiece W due to the magnetic field of the coil increases, and Joule heat generated in the portion increases. Accordingly, the specific portion Wb of the workpiece W can be heated to an oxidation temperature or higher and colored with an oxidation color simultaneously with the heating of the portion Wa requiring the heat treatment of the workpiece W. Then, the specific portion Wb is colored by oxidation, so that it is possible to easily and surely identify whether or not the workpiece W has completed the tempering process.
Therefore, according to the embodiment of the present invention, unlike the conventional method of automatically determining the presence / absence of a baked color of a product and the method of automatically engraving or applying ink on a product, the workpiece W is subjected to heat treatment. It is possible to easily and reliably determine whether or not it is completed without incurring equipment costs or work costs.

又、本発明の実施の形態に係る焼戻し方法は、ワークＷの焼戻しが必要な部位Ｗａに対するインダクションコイル１６を用いた加熱と同時進行で、ワークＷの熱処理が必要な部位とは異なる特定部位Ｗｂに対し、インダクションコイル１６を構成する導線の一部分１６Ｂを、ワークＷの熱処理が必要な部位Ｗａより接近させ、特定部位Ｗｂを酸化色が付く温度へと加熱するものである。
この方法によれば、ワークＷの特定部位Ｗｂの近傍において、コイルの磁界によりワークに発生する渦電流を増加させ、その部分に発生するジュール熱を増大させる。よって、ワークＷの熱処理が必要な部位Ｗａに対する熱処理と同時進行で、ワークの特定部分Ｗｂを酸化温度以上に加熱し、着色させることが可能となる（図６）。そして、特定部分Ｗｂが酸化により着色されることで、熱処理工程が完了しているか否かの判別を、目視により容易かつ確実に識別することが可能となる。この際、ワークの熱処理が必要な部位Ｗｂについては、所望の加熱温度を超えることはないので（図５のＴａ参照）、ワークＷの焼戻しが必要な部位Ｗａに、必要な機械的性質を与えることができる。従って、熱処理工程が完了しているか否かを、目視により容易かつ確実に識別することが可能な、熱処理製品を提供することが可能となる。 Further, the tempering method according to the embodiment of the present invention is a specific part Wb different from the part that requires heat treatment of the workpiece W at the same time as the heating using the induction coil 16 for the part Wa that requires tempering of the workpiece W. On the other hand, a part 16B of the conducting wire constituting the induction coil 16 is brought closer to a part Wa where the workpiece W needs to be heat-treated, and the specific part Wb is heated to a temperature at which an oxidation color is given.
According to this method, in the vicinity of the specific portion Wb of the workpiece W, the eddy current generated in the workpiece by the magnetic field of the coil is increased, and the Joule heat generated in that portion is increased. Therefore, the specific portion Wb of the workpiece can be heated to the oxidation temperature or higher and colored at the same time as the heat treatment for the portion Wa requiring the heat treatment of the workpiece W (FIG. 6). Then, the specific portion Wb is colored by oxidation, so that it is possible to easily and reliably discriminate whether or not the heat treatment process has been completed. At this time, the portion Wb that requires heat treatment of the workpiece does not exceed the desired heating temperature (see Ta in FIG. 5), and therefore the necessary mechanical properties are given to the portion Wa that requires tempering of the workpiece W. be able to. Accordingly, it is possible to provide a heat treatment product that can easily and reliably identify whether or not the heat treatment step is completed.

なお、本発明の実施の形態では、ワークＷがクランクシャフトであり、かつ、インダクションコイル１６の内部にワークＷをセットして焼戻しを行う場合を例示して説明したことから、導線の巻き線形状が不連続に形成された部分１６Ｂは、製造の便宜上最も単純な形状である、円弧状の導線１８と、円弧状の導線１８の円周上の二点を一直線につなぐ直線状の導線２０とからなる巻き線形状となっている。しかしながら、例えば、導線の巻き線形状が不連続に形成された部分１６Ｂを、クランクシャフトＷｂの外周を包むように円弧状又は小径の円形に導線を形成することとしても良い。又、インダクションコイル１６の外周部にワークをセットして焼戻しを行うような場合には、そのようなワークの形状に応じて、各ワークの特定部分に導線の一部分が最接近するように、導線の巻き線形状が不連続に形成された部分１６Ｂを形成することとする。   In the embodiment of the present invention, the case where the workpiece W is a crankshaft and the workpiece W is set in the induction coil 16 and tempered is described as an example. The part 16B formed in a discontinuous manner is an arcuate conductor 18 that is the simplest for convenience of manufacturing, and a linear conductor 20 that connects two points on the circumference of the arcuate conductor 18 in a straight line. It has a winding shape consisting of However, for example, the portion 16B in which the winding shape of the conducting wire is formed discontinuously may be formed into an arc shape or a small-diameter circle so as to wrap around the outer periphery of the crankshaft Wb. When a work is set on the outer periphery of the induction coil 16 and tempering is performed, the conductor is arranged so that a part of the conductor is closest to a specific part of each work according to the shape of the work. A portion 16B in which the winding shape is formed discontinuously is formed.

又、本発明の実施の形態では、導線の巻き線形状が一定半径筒状の部分１６Ａに係る導線と、導線の巻き線形状が不連続に形成された部分１６Ｂに係る導線とが一体に構成されていることで、インダクションコイル１６の構成部品数が少なくなり、構造の単純化が図られている。しかしながら、導線の巻き線形状が一定半径筒状の部分１６Ａに係る導線と、導線の巻き線形状が不連続に形成された部分１６Ｂに係る導線とを別体に構成し、それらを連結することとしても良い。この場合には、インダクションコイル１６のそれぞれの部分を別工程で製造することが可能となるので、各形状部分の製造が容易となり、なおかつ、各部をユニット化して組合せることで、様々なワーク形状にも柔軟に対応することが可能なインダクションコイル１６を提供することが可能となる。
更には、インダクションコイル１６を焼入れ用に構成することで、本発明の実施の形態に係る高周波熱処理装置１０及び熱処理方法を、焼入れ工程にも用いることも可能である。 Further, in the embodiment of the present invention, the conducting wire related to the portion 16A in which the winding shape of the conducting wire has a constant radius and the conducting wire related to the portion 16B in which the winding shape of the conducting wire is formed discontinuously are integrally configured. As a result, the number of components of the induction coil 16 is reduced, and the structure is simplified. However, the conducting wire related to the part 16A having a constant-radius cylindrical shape and the conducting wire related to the part 16B in which the winding shape of the conducting wire is formed discontinuously are configured separately and connected to each other. It is also good. In this case, since each part of the induction coil 16 can be manufactured in a separate process, manufacturing of each shape part becomes easy, and various parts can be formed by combining each part as a unit. In addition, it is possible to provide the induction coil 16 that can flexibly cope with the above.
Furthermore, by configuring the induction coil 16 for quenching, the high-frequency heat treatment apparatus 10 and the heat treatment method according to the embodiment of the present invention can be used in the quenching process.

本発明の実施の形態に係る高周波熱処理装置の、要部概略図である。It is a principal part schematic diagram of the high frequency heat processing apparatus which concerns on embodiment of this invention. 図１に示される高周波熱処理装置の、インダクションコイルの端面図である。It is an end view of the induction coil of the high frequency heat processing apparatus shown by FIG. 本発明の実施の形態における熱処理製品であるクランクシャフトの側面図である。It is a side view of the crankshaft which is the heat processing product in embodiment of this invention. 本発明の実施の形態におけるワークの焼戻し装置の、全体的構成を示す模式図である。It is a schematic diagram which shows the whole structure of the tempering apparatus of the workpiece | work in embodiment of this invention. 本発明の実施の形態に係る高周波熱処理装置によって加熱されたワークの、焼戻しが必要な部位の温度変化と、焼戻しが必要な部位を除く特定部位の温度変化を示すグラフである。It is a graph which shows the temperature change of the site | part which needs tempering of the workpiece | work heated by the high frequency heat processing apparatus which concerns on embodiment of this invention, and the temperature change of the specific site | part except the site | part which needs tempering. 本発明の実施の形態に係る焼戻し方法により、ワークの特定部位に酸化色が付いた様子を示す参考図である。It is a reference figure which shows a mode that the oxidation color was added to the specific site | part of the workpiece | work by the tempering method which concerns on embodiment of this invention.

符号の説明Explanation of symbols

１０：高周波熱処理装置、１６：インダクションコイル、１６Ａ：一定半径筒状の部分、１６Ｂ：導線の巻き線形状が不連続に形成された部分、１８：円弧状の導線、２０：直線状の導線、Ｗ：ワーク、Ｗａ：熱処理が必要な部位、Ｗｂ：ワークの特定部位   10: induction heat treatment apparatus, 16: induction coil, 16A: cylindrical portion having a constant radius, 16B: a portion where the winding shape of the conductive wire is formed discontinuously, 18: an arc-shaped conductive wire, 20: a linear conductive wire, W: workpiece, Wa: site requiring heat treatment, Wb: specific site of workpiece

Claims (5)

導線の巻き線形状が一定半径筒状の部分と、前記一定半径筒状の部分よりワークの表面に導線が接近するように、前記一定半径筒状の部分に対し導線の巻き線形状が不連続に形成された部分と、を有するインダクションコイルを備えることを特徴とする高周波熱処理装置。 The winding shape of the conducting wire is discontinuous with respect to the constant radius cylindrical portion so that the winding shape of the conducting wire is a constant radius cylindrical portion and the conducting wire is closer to the surface of the work than the constant radius cylindrical portion. An induction heat treatment apparatus comprising: an induction coil having a portion formed on the substrate. 前記導線の巻き線形状が不連続に形成された部分に係る導線は、前記一定半径筒状の部分の、円周上の二点を一直線につないだ巻き線形状に形成されていることを特徴とする請求項１記載の高周波熱処理装置。 The conducting wire related to the portion where the winding shape of the conducting wire is formed discontinuously is formed in a winding shape in which two points on the circumference of the constant radius cylindrical portion are connected in a straight line. The high-frequency heat treatment apparatus according to claim 1. 前記導線の巻き線形状が一定半径筒状の部分に係る導線と、前記導線の巻き線形状が不連続に形成された部分に係る導線とは、一体に構成されていることを特徴とする請求項１又は２記載の高周波熱処理装置。 The conducting wire relating to a portion in which the winding shape of the conducting wire has a constant radius cylindrical shape and the conducting wire relating to a portion in which the winding shape of the conducting wire is formed discontinuously are integrally formed. Item 3. The high frequency heat treatment apparatus according to Item 1 or 2. 前記導線の巻き線形状が一定半径筒状の部分に係る導線と、前記導線の巻き線形状が不連続に形成された部分に係る導線とは、別体に構成され連結されていることを特徴とする請求項１又は２記載の高周波熱処理装置。 The conducting wire related to the part having a constant radius cylindrical shape and the conducting wire related to the part where the winding shape of the conducting wire is formed discontinuously are configured and connected separately. The high frequency heat treatment apparatus according to claim 1 or 2. ワークの熱処理が必要な部位に対するインダクションコイルを用いた加熱と同時進行で、前記ワークの熱処理が必要な部位とは異なる特定部位に対し、前記インダクションコイルを構成する導線の一部分を、前記ワークの熱処理が必要な部位より接近させ、前記特定部位を酸化色が付く温度へと加熱することを特徴とする熱処理方法。 A part of the conductive wire constituting the induction coil is heat-treated with respect to a specific portion different from the portion requiring heat treatment of the workpiece simultaneously with heating using the induction coil for the portion requiring heat treatment of the workpiece. Is heated closer to the necessary part, and the specific part is heated to a temperature at which oxidation color is given.
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JPH0464009A (en) * 1990-07-02 1992-02-28 Honda Motor Co Ltd Inspecting method for compound layer
JPH1131579A (en) * 1997-07-11 1999-02-02 Daihatsu Motor Co Ltd Inspection method for induction hardened part
JP2001303134A (en) * 2000-04-26 2001-10-31 Denki Kogyo Co Ltd Method and apparatus for high-frequency induction tempering of crank shaft apparatus
JP2004003035A (en) * 2003-07-04 2004-01-08 Denki Kogyo Co Ltd High-frequency induction heating method for tempering crankshaft
JP2006009096A (en) * 2004-06-25 2006-01-12 Fuji Electronics Industry Co Ltd Heat-treatment apparatus for crank shaft

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Publication number Priority date Publication date Assignee Title
JPH0464009A (en) * 1990-07-02 1992-02-28 Honda Motor Co Ltd Inspecting method for compound layer
JPH1131579A (en) * 1997-07-11 1999-02-02 Daihatsu Motor Co Ltd Inspection method for induction hardened part
JP2001303134A (en) * 2000-04-26 2001-10-31 Denki Kogyo Co Ltd Method and apparatus for high-frequency induction tempering of crank shaft apparatus
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JP2006009096A (en) * 2004-06-25 2006-01-12 Fuji Electronics Industry Co Ltd Heat-treatment apparatus for crank shaft

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