JP2013023727A - Induction heat treatment apparatus and induction heat treatment method - Google Patents

Induction heat treatment apparatus and induction heat treatment method Download PDF

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JP2013023727A
JP2013023727A JP2011158919A JP2011158919A JP2013023727A JP 2013023727 A JP2013023727 A JP 2013023727A JP 2011158919 A JP2011158919 A JP 2011158919A JP 2011158919 A JP2011158919 A JP 2011158919A JP 2013023727 A JP2013023727 A JP 2013023727A
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JP5896106B2 (en
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Shinya Kida
伸也 木田
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Toyota Motor Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an induction heat treatment apparatus and an induction heat treatment method capable of partially adjusting heating ability with inexpensive facility cost.SOLUTION: High frequency current is applied to a high-frequency induction heating coil 5 while a heating control coil 6 is opposed to a heating control part 4 (a gear-press fitting part 4) of an element 1 to be heated (crankshafts 1A and 1B) in the high-frequency induction heating coil 5 by disposing the heating control coil 6 on the outer perimeter of the high-frequency induction heating coil 5, and also high frequency current in the direction reverse to the high frequency current applied to the high-frequency induction heating coil 5 is applied to the heating control coil 6. As a result, partial overheat of the element 1 to be heated is controlled by partially adjusting the heating ability of the high-frequency induction heating coil 5. Also, the facility cost is inexpensive because heat treatment on multiple kinds of elements 1 to be heated having different shapes can be performed using the same facilities.

Description

本発明は、高周波誘導加熱コイルを用いて被加熱体を高周波熱処理するための装置及び方法に関する。   The present invention relates to an apparatus and a method for subjecting an object to be heated to high frequency heat treatment using a high frequency induction heating coil.

周知のように、高周波焼入された材料は、適当な温度にまで再加熱した後に冷却する処理（焼戻）を施すことにより、材料表面の脆性と靭性とのバランスを調整することが可能である。例えば、高周波焼入されたクランクシャフトは、一定の巻径で螺旋状に巻かれた中空の高周波誘導加熱コイル内で高周波誘導加熱させることで焼戻することが可能である。この場合、相対的に体積が大きくコイルギャップが小さいギア圧入部は、オーバーヒートが問題となる。   As is well known, induction-quenched materials can be reheated to an appropriate temperature and then cooled (tempered) to adjust the balance between brittleness and toughness of the material surface. is there. For example, an induction-hardened crankshaft can be tempered by high-frequency induction heating in a hollow high-frequency induction heating coil spirally wound with a constant winding diameter. In this case, overheating becomes a problem in the gear press-fitted portion having a relatively large volume and a small coil gap.

そこで、特許文献１には、非磁性体の良導体である当て金を被焼入物体のオーバーヒートし易い部分（以下、加熱抑制部という）に当接させて被焼入物体を高周波誘導加熱する加熱処理方法（以下、公知技術という）が開示されている。この公知技術では、高周波誘導加熱コイルに高周波電流が印加されると、当て金には高周波誘導加熱コイルに印加された高周波電流に対して逆方向の誘導電流が流れる。この誘導電流によって発生する磁束は、高周波誘導加熱コイルが発生する磁束を打ち消すように作用することから、被焼入物体の加熱抑制部のジュール発熱を抑制することができる。   Therefore, in Patent Document 1, heating that heats the object to be hardened by high-frequency induction by bringing a metal base, which is a good non-magnetic conductor, into contact with the portion of the object to be hardened (hereinafter referred to as a heating suppression unit). A processing method (hereinafter referred to as a known technique) is disclosed. In this known technique, when a high-frequency current is applied to the high-frequency induction heating coil, an induction current in a direction opposite to the high-frequency current applied to the high-frequency induction heating coil flows through the pad. Since the magnetic flux generated by the induction current acts to cancel the magnetic flux generated by the high frequency induction heating coil, it is possible to suppress Joule heat generation in the heating suppression portion of the object to be hardened.

特開２０００−２２７１２３号公報JP 2000-227123 A

しかしながら、公知技術は、当て金を加熱抑制部に当接させた状態で中空の高周波誘導加熱コイル内に配置させるため、当て金の形状及び配置に制約がある。また、当て金を製品（被焼入物体）毎に用意する必要があるため、設備コストが増大するとともに新規に製品が発生した場合に迅速に対応することが困難である。
そこで本発明は、上記事情に鑑みてなされたもので、安価な設備コストで加熱能力を部分的に調節することが可能な高周波熱処理装置及び高周波熱処理方法を提供することを課題としてなされたものである。 However, since the known technique is arranged in the hollow high-frequency induction heating coil in a state where the contact metal is in contact with the heating suppressing portion, the shape and arrangement of the contact metal are limited. In addition, since it is necessary to prepare a pad for each product (hardened object), the equipment cost increases and it is difficult to quickly respond when a new product is generated.
Then, this invention was made | formed in view of the said situation, and it was made as a subject to provide the high-frequency heat processing apparatus and high-frequency heat processing method which can adjust a heating capability partially with cheap equipment cost. is there.

上記課題を解決するために、本発明の高周波熱処理装置は、螺旋状に巻かれた中空の高周波誘導加熱コイルを備えて、前記高周波誘導加熱コイルに高周波電流が印加されることで、前記高周波誘導加熱コイル内に配置された被加熱体が高周波誘導加熱される高周波熱処理装置であって、前記高周波誘導加熱コイルの外周又は内周に配置されて非磁性体の良導体によって構成される加熱抑制コイルと、前記加熱抑制コイルを前記被加熱体に対して位置決めさせる位置決め手段と、を有することを特徴とする。   In order to solve the above-described problems, the high-frequency heat treatment apparatus of the present invention includes a hollow high-frequency induction heating coil wound in a spiral shape, and a high-frequency current is applied to the high-frequency induction heating coil, whereby the high-frequency induction A high-frequency heat treatment apparatus in which an object to be heated disposed in a heating coil is induction-heated by high-frequency induction heating, and a heating suppression coil that is disposed on the outer periphery or inner periphery of the high-frequency induction heating coil and is configured by a non-magnetic good conductor; And positioning means for positioning the heating suppression coil with respect to the object to be heated.

上記課題を解決するために、本発明の高周波熱処理方法は、螺旋状に巻かれた中空の高周波誘導加熱コイルに高周波電流を印加して、前記高周波誘導加熱コイル内に配置された被加熱体を高周波誘導加熱させる高周波熱処理方法であって、前記高周波誘導加熱コイルの外周又は内周に、非磁性体の良導体によって構成される加熱抑制コイルを設けておいて、前記被加熱体を前記高周波誘導加熱コイル内に配置するとともに前記加熱抑制コイルを前記被加熱体の発熱量を抑制したい部分に対向させて配置して、この状態で前記高周波誘導加熱コイルに高周波電流を印加することを特徴とする。   In order to solve the above-described problems, the high-frequency heat treatment method of the present invention applies a high-frequency current to a hollow high-frequency induction heating coil wound in a spiral shape, and a heated object disposed in the high-frequency induction heating coil A high-frequency heat treatment method for high-frequency induction heating, wherein a heating suppression coil configured by a non-magnetic good conductor is provided on an outer periphery or an inner periphery of the high-frequency induction heating coil, and the object to be heated is subjected to the high-frequency induction heating. It arrange | positions in a coil, the said heating suppression coil is arrange | positioned facing the part which wants to suppress the emitted-heat amount of the said to-be-heated body, and applies a high frequency current to the said high frequency induction heating coil in this state, It is characterized by the above-mentioned.

（発明の態様）
以下に、本願において特許請求が可能と認識されている発明（以下、請求可能発明と称する）の態様を例示し、例示された各態様について説明する。ここでは、各態様を、特許請求の範囲と同様に、項に区分すると共に各項に番号を付し、必要に応じて他の項の記載を引用する形式で記載する。これは、請求可能発明の理解を容易にするためであり、請求可能発明を構成する構成要素の組み合わせを、以下の各項に記載されたものに限定する趣旨ではない。つまり、請求可能発明は、各項に付随する記載、実施形態の記載等を参酌して解釈されるべきであり、その解釈に従う限りにおいて、各項の態様にさらに他の構成要素を付加した態様も、また、各項の態様から構成要素を削除した態様も、請求可能発明の一態様となり得る。
なお、以下の各項において、（１）〜（４）項の各々が、特許請求の範囲に記載した請求項１〜４の各々に相当する。 (Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of items (1) to (4) corresponds to each of claims 1 to 4 described in the claims.

（１）螺旋状に巻かれた中空の高周波誘導加熱コイルを備えて、高周波誘導加熱コイルに高周波電流が印加されることで、高周波誘導加熱コイル内に配置された被加熱体が高周波誘導加熱される高周波熱処理装置であって、高周波誘導加熱コイルの外周又は内周に配置されて非磁性体の良導体によって形成された環形状の加熱抑制コイルと、加熱抑制コイルを被加熱体に対して位置決めさせる位置決め手段と、を有することを特徴とする高周波熱処理装置。
本項に記載の高周波熱処理装置によれば、加熱抑制コイルを、高周波誘導加熱コイル内に配置された被加熱体の加熱抑制部（発熱量を抑制したい部分）に対向させて配置して、この状態で高周波誘導加熱コイルに高周波電流を印加すると、加熱抑制コイルには、高周波誘導加熱コイルに印加した高周波電流に対して逆方向の誘導電流が流れる。この誘導電流によって生じる加熱抑制コイルの磁束は、高周波誘導加熱コイルの磁束を打ち消すように作用する。その結果、被加熱体における加熱抑制部のジュール発熱を抑制することができる。
そして、本項に記載の高周波熱処理装置は、被加熱体の加熱抑制部の位置が変更になった場合であっても、位置決め手段によって加熱抑制コイルを移動させるだけで対応することができるので、製品（被加熱体）毎に当て金を製作する必要がある公知技術と比較して、設備コストを大幅に削減することができるだけでなく、新規の製品（被加熱体）に対して迅速な対応が可能である。
ここで、本項に記載の高周波熱処理装置を使用したクランクシャフトの焼戻を想定する。なお、対象となるクランクシャフトは、直列４気筒エンジンに組み込まれるクランクシャフトであり、４個の各ピン部の両端に配置された合計で８個あるアーム部のうち、１個のアーム部にギア圧入部（加熱抑制部）が形成されている。このギア圧入部は、他のアーム部と比較して体積が大きくコイルギャップが小さい。
この場合、中空の高周波誘導加熱コイル内にクランクシャフトを配置して、位置決め手段によって、加熱抑制コイルを高周波誘導加熱コイルの軸線方向へ移動させることにより、加熱抑制コイルをギア圧入部に対向させて位置決めさせる。この状態で、高周波誘導加熱コイルに高周波電流を印加すると、加熱抑制コイルに、高周波誘導加熱コイルに印加された高周波電流に対して逆方向の誘導電流が流れる。この誘導電流によって生じる加熱抑制コイルの磁束は、高周波誘導加熱コイルの磁束を打ち消すように作用する。これにより、高周波誘導加熱コイルの加熱能力が部分的に調節されてギア圧入部のジュール発熱が抑制される。その結果、ギア圧入部のオーバーヒートを回避することができる。
本項の態様において、加熱抑制コイルの巻数は必要に応じて適宜設定することができる。また、加熱抑制コイルの巻数は必ずしも１以上である必要はなく、例えば、半開放型コイルを採用することができる。
本項の態様において、加熱抑制コイルを高周波誘導加熱コイルの内側に配置した場合、加熱抑制コイルを高周波誘導加熱コイルの外周に配置した場合と比較して、加熱抑制コイルの磁束によって打ち消される高周波誘導加熱コイルの磁束が増大するので、加熱抑制部のジュール発熱をより効果的に抑制することができる。 (1) A hollow high-frequency induction heating coil wound in a spiral shape is provided, and a high-frequency current is applied to the high-frequency induction heating coil, so that an object to be heated disposed in the high-frequency induction heating coil is high-frequency induction heated. A high-frequency heat treatment apparatus, which is arranged on the outer periphery or inner periphery of a high-frequency induction heating coil and is formed of a nonmagnetic magnetic good conductor, and the heating suppression coil is positioned with respect to the object to be heated A high-frequency heat treatment apparatus comprising a positioning means.
According to the high-frequency heat treatment apparatus described in this section, the heating suppression coil is disposed so as to face the heating suppression portion (portion where heat generation is desired to be suppressed) of the object to be heated disposed in the high-frequency induction heating coil. When a high frequency current is applied to the high frequency induction heating coil in the state, an induction current in the opposite direction flows to the heating suppression coil with respect to the high frequency current applied to the high frequency induction heating coil. The magnetic flux of the heating suppression coil generated by this induction current acts to cancel the magnetic flux of the high frequency induction heating coil. As a result, it is possible to suppress Joule heat generation at the heating suppression portion in the heated object.
And the high-frequency heat treatment apparatus described in this section can cope with only the movement of the heating suppression coil by the positioning means, even when the position of the heating suppression portion of the object to be heated is changed. Compared to the known technology that needs to manufacture a metal pad for each product (subject to be heated), not only can the equipment cost be significantly reduced, but also a quick response to a new product (subject to be heated). Is possible.
Here, tempering of the crankshaft using the induction heat treatment apparatus described in this section is assumed. The target crankshaft is a crankshaft incorporated in an in-line four-cylinder engine. Of the total of eight arm portions arranged at both ends of each of the four pin portions, one arm portion has a gear. A press-fit portion (heating suppression portion) is formed. The gear press-fitting portion has a larger volume and a smaller coil gap than the other arm portions.
In this case, the crankshaft is disposed in the hollow high-frequency induction heating coil, and the heating suppression coil is moved in the axial direction of the high-frequency induction heating coil by the positioning means so that the heating suppression coil faces the gear press-fit portion. Position it. In this state, when a high-frequency current is applied to the high-frequency induction heating coil, an induction current in a direction opposite to the high-frequency current applied to the high-frequency induction heating coil flows through the heating suppression coil. The magnetic flux of the heating suppression coil generated by this induction current acts to cancel the magnetic flux of the high frequency induction heating coil. Thereby, the heating capability of the high frequency induction heating coil is partially adjusted to suppress Joule heat generation in the gear press-fitting portion. As a result, overheating of the gear press-fit portion can be avoided.
In the aspect of this section, the number of turns of the heating suppression coil can be appropriately set as necessary. Further, the number of turns of the heating suppression coil is not necessarily one or more, and for example, a semi-open coil can be adopted.
In the aspect of this section, when the heating suppression coil is arranged inside the high-frequency induction heating coil, compared with the case where the heating suppression coil is arranged on the outer periphery of the high-frequency induction heating coil, the high-frequency induction canceled by the magnetic flux of the heating suppression coil Since the magnetic flux of the heating coil is increased, the Joule heat generation of the heating suppression unit can be more effectively suppressed.

（２）加熱抑制コイルに、高周波誘導加熱コイルに印加される高周波電流に対して逆方向の高周波電流が印加される（１）の高周波熱処理装置。
本項に記載の高周波熱処理装置によれば、加熱抑制コイルに高周波電流を印加しない場合、すなわち、高周波誘導加熱コイルに高周波電流が印加されることによる誘導電流のみが加熱抑制コイルに流れる場合と比較して、加熱抑制コイルの磁束を増大させることができる。これにより、加熱抑制コイルの磁束によってより多くの高周波誘導加熱コイルの磁束が打ち消されることになり、加熱抑制部のジュール発熱をより効果的に抑制することができる。また、加熱抑制コイルに印加する高周波電流を制御することにより、加熱抑制部のジュール発熱を制御することができる。 (2) The high frequency heat treatment apparatus according to (1), wherein a high frequency current in a direction opposite to a high frequency current applied to the high frequency induction heating coil is applied to the heating suppression coil.
According to the high-frequency heat treatment apparatus described in this section, compared to a case where no high-frequency current is applied to the heating suppression coil, that is, only an induction current caused by applying a high-frequency current to the high-frequency induction heating coil flows through the heating suppression coil. Thus, the magnetic flux of the heating suppression coil can be increased. Thereby, the magnetic flux of more high frequency induction heating coils will be canceled by the magnetic flux of a heating suppression coil, and the Joule heat generation of a heating suppression part can be suppressed more effectively. Moreover, the Joule heat generation of the heating suppression unit can be controlled by controlling the high-frequency current applied to the heating suppression coil.

（３）螺旋状に巻かれた中空の高周波誘導加熱コイルに高周波電流を印加して、高周波誘導加熱コイル内に配置された被加熱体を高周波誘導加熱させる高周波熱処理方法であって、高周波誘導加熱コイルの外周又は内周に、非磁性体の良導体によって構成される加熱抑制コイルを設けておいて、被加熱体を高周波誘導加熱コイル内に配置するとともに加熱抑制コイルを被加熱体の発熱量を抑制したい部分に対向させて配置して、この状態で高周波誘導加熱コイルに高周波電流を印加することを特徴とする高周波熱処理方法。
本項に記載の高周波熱処理方法によれば、加熱抑制コイルを、高周波誘導加熱コイル内に配置された被加熱体の加熱抑制部（発熱量を抑制したい部分）に対向させて配置して、この状態で高周波誘導加熱コイルに通電すると、加熱抑制コイルには、高周波誘導加熱コイルに流れる高周波電流に対して逆方向の誘導電流が流れる。この誘導電流によって生じる加熱抑制コイルの磁束は、高周波誘導加熱コイルの磁束を打ち消すように作用するので、被加熱体における加熱抑制部のジュール発熱を抑制することができる。
そして、本項に記載の高周波熱処理方法は、被加熱体の加熱抑制部の位置が変更になった場合であっても、加熱抑制コイルを移動させるだけで対応することができるので、製品（被加熱体）毎に当て金を製作する必要がある公知技術と比較して、設備コストを大幅に削減することができるだけでなく、新規の製品（被加熱体）に対して迅速な対応が可能である。
ここで、本項に記載の高周波熱処理方法を使用したクランクシャフトの焼戻を想定する。なお、対象となるクランクシャフトは、直列４気筒エンジンに組み込まれるクランクシャフトであり、４個の各ピン部の両端に配置された合計で８個あるアーム部のうち、１個のアーム部にギア圧入部（加熱抑制部）が形成されている。このギア圧入部は、他のアーム部と比較して体積が大きくコイルギャップが小さい。
この場合、中空の高周波誘導加熱コイル内にクランクシャフトを配置して、位置決め手段によって、加熱抑制コイルを高周波誘導加熱コイルの軸線方向へ移動させることにより、加熱抑制コイルをギア圧入部に対向させて位置決めさせる。この状態で、高周波誘導加熱コイルに高周波電流を印加すると、加熱抑制コイルに、高周波誘導加熱コイルに印加された高周波電流に対して逆方向の誘導電流が流れる。この誘導電流によって生じる加熱抑制コイルの磁束は、高周波誘導加熱コイルの磁束を打ち消すように作用する。これにより、高周波誘導加熱コイルの加熱能力が部分的に調節されてギア圧入部のジュール発熱が抑制される。その結果、ギア圧入部のオーバーヒートを回避することができる。
本項の態様において、加熱抑制コイルの巻数は必要に応じて適宜設定することができる。また、加熱抑制コイルの巻数は必ずしも１以上である必要はなく、例えば、半開放型コイルを採用することができる。
本項の態様において、加熱抑制コイルを高周波誘導加熱コイルの内側に配置した場合、加熱抑制コイルを高周波誘導加熱コイルの外周に配置した場合と比較して、加熱抑制コイルの磁束によって打ち消される高周波誘導加熱コイルの磁束が増大するので、加熱抑制部のジュール発熱をより効果的に抑制することができる。 (3) A high-frequency induction heating method in which a high-frequency current is applied to a spirally wound hollow high-frequency induction heating coil to heat the object to be heated arranged in the high-frequency induction heating coil. A heating suppression coil composed of a non-magnetic good conductor is provided on the outer periphery or inner periphery of the coil, and the heating target is disposed in the high frequency induction heating coil and the heating suppression coil is used to reduce the amount of heat generated by the heating target. A high-frequency heat treatment method characterized in that a high-frequency current is applied to a high-frequency induction heating coil in such a state that the high-frequency induction heating coil is arranged facing a portion to be suppressed.
According to the high-frequency heat treatment method described in this section, the heating suppression coil is disposed so as to face the heating suppression portion (the portion where the amount of heat generation is desired to be suppressed) of the heated body disposed in the high-frequency induction heating coil. When the high-frequency induction heating coil is energized in the state, an induction current in a direction opposite to the high-frequency current flowing through the high-frequency induction heating coil flows through the heating suppression coil. Since the magnetic flux of the heating suppression coil generated by this induction current acts so as to cancel the magnetic flux of the high frequency induction heating coil, Joule heat generation of the heating suppression portion in the heated object can be suppressed.
In addition, the high-frequency heat treatment method described in this section can cope with the change in the position of the heating suppression portion of the object to be heated simply by moving the heating suppression coil. Compared to the known technology that needs to manufacture a metal pad for each heating element), not only can the equipment cost be greatly reduced, but also a quick response to a new product (object to be heated). is there.
Here, tempering of the crankshaft using the induction heat treatment method described in this section is assumed. The target crankshaft is a crankshaft incorporated in an in-line four-cylinder engine. Of the total of eight arm portions arranged at both ends of each of the four pin portions, one arm portion has a gear. A press-fit portion (heating suppression portion) is formed. The gear press-fitting portion has a larger volume and a smaller coil gap than the other arm portions.
In this case, the crankshaft is disposed in the hollow high-frequency induction heating coil, and the heating suppression coil is moved in the axial direction of the high-frequency induction heating coil by the positioning means so that the heating suppression coil faces the gear press-fit portion. Position it. In this state, when a high-frequency current is applied to the high-frequency induction heating coil, an induction current in a direction opposite to the high-frequency current applied to the high-frequency induction heating coil flows through the heating suppression coil. The magnetic flux of the heating suppression coil generated by this induction current acts to cancel the magnetic flux of the high frequency induction heating coil. Thereby, the heating capability of the high frequency induction heating coil is partially adjusted to suppress Joule heat generation in the gear press-fitting portion. As a result, overheating of the gear press-fit portion can be avoided.
In the aspect of this section, the number of turns of the heating suppression coil can be appropriately set as necessary. Further, the number of turns of the heating suppression coil is not necessarily one or more, and for example, a semi-open coil can be adopted.
In the aspect of this section, when the heating suppression coil is arranged inside the high-frequency induction heating coil, compared with the case where the heating suppression coil is arranged on the outer periphery of the high-frequency induction heating coil, the high-frequency induction canceled by the magnetic flux of the heating suppression coil Since the magnetic flux of the heating coil is increased, the Joule heat generation of the heating suppression unit can be more effectively suppressed.

（４）高周波誘導加熱コイルに高周波電流を印加している間、加熱抑制コイルに、高周波誘導加熱コイルに印加する高周波電流に対して逆方向の高周波電流を印加する（３）の高周波熱処理方法。
本項に記載の高周波熱処理方法によれば、加熱抑制コイルに高周波電流を印加しない場合、すなわち、高周波誘導加熱コイルに高周波電流が印加されることによる誘導電流のみが加熱抑制コイルに流れる場合と比較して、加熱抑制コイルの磁束を増大させることができる。これにより、加熱抑制コイルの磁束によってより多くの高周波誘導加熱コイルの磁束が打ち消されることになり、加熱抑制部のジュール発熱をより効果的に抑制することができる。また、加熱抑制コイルに印加する高周波電流を制御することにより、加熱抑制部のジュール発熱を制御することができる。 (4) The high frequency heat treatment method according to (3), wherein a high frequency current in a direction opposite to the high frequency current applied to the high frequency induction heating coil is applied to the heating suppression coil while the high frequency current is applied to the high frequency induction heating coil.
According to the high-frequency heat treatment method described in this section, compared with a case where no high-frequency current is applied to the heating suppression coil, that is, only an induction current caused by applying a high-frequency current to the high-frequency induction heating coil flows through the heating suppression coil. Thus, the magnetic flux of the heating suppression coil can be increased. Thereby, the magnetic flux of more high frequency induction heating coils will be canceled by the magnetic flux of a heating suppression coil, and the Joule heat generation of a heating suppression part can be suppressed more effectively. Moreover, the Joule heat generation of the heating suppression unit can be controlled by controlling the high-frequency current applied to the heating suppression coil.

本発明によれば、安価な設備コストで加熱能力を部分的に調節することが可能な高周波熱処理装置及び高周波熱処理方法を提供することができる。   According to the present invention, it is possible to provide a high-frequency heat treatment apparatus and a high-frequency heat treatment method capable of partially adjusting the heating capacity at a low equipment cost.

本実施形態を概略的に説明するための斜視図である。It is a perspective view for demonstrating this embodiment roughly. 被加熱体としてのクランクシャフト１Ａの斜視図である。It is a perspective view of crankshaft 1A as a to-be-heated body. 被加熱体としてのクランクシャフト１Ｂの斜視図である。It is a perspective view of crankshaft 1B as a to-be-heated body. クランクシャフト１Ａを熱処理する場合の加熱抑制コイルの位置を説明するための図である。It is a figure for demonstrating the position of the heating suppression coil in the case of heat-processing the crankshaft 1A. クランクシャフト１Ｂを熱処理する場合の加熱抑制コイルの位置を説明するための図である。It is a figure for demonstrating the position of the heating suppression coil in the case of heat-processing the crankshaft 1B.

本発明の一実施形態を添付した図を参照して説明する。ここでは、高周波焼入されたクランクシャフト１Ａ及び１Ｂ（被加熱体）を焼戻するための高周波熱処理装置及び高周波熱処理方法を説明する。   An embodiment of the present invention will be described with reference to the accompanying drawings. Here, a high-frequency heat treatment apparatus and a high-frequency heat treatment method for tempering the induction-hardened crankshafts 1A and 1B (objects to be heated) will be described.

図２及び図３に示されるように、クランクシャフト１Ａ及び１Ｂは、各々、直列４気筒エンジンに組み込まれるクランクシャフト１Ａ、１Ｂ（以下、必要に応じて被加熱体１と使い分ける）である。クランクシャフト１Ａには、出力軸２側（図２における左側）から数えて６番目のアーム部３にギア圧入部４（以下、必要に応じて加熱抑制部４と使い分ける）が形成されている。他方、クランクシャフト１Ｂには、出力軸２側（図３における左側）から数えて３番目のアーム部３にギア圧入部４が形成されている。クランクシャフト１Ａ及び１Ｂの各ギア圧入部４は、ギア圧入部４が形成されていない他のアーム部３と比較して、体積が大きく高周波誘導加熱コイル５に対するコイルギャップが小さい。なお、クランクシャフト１Ａとクランクシャフト１Ｂとは、ギア圧入部４の位置が異なる点を除いて、その他の部分の外形（寸法）が同一である。   As shown in FIGS. 2 and 3, the crankshafts 1 </ b> A and 1 </ b> B are crankshafts 1 </ b> A and 1 </ b> B (hereinafter, used separately from the heated object 1 as necessary) incorporated in the in-line four-cylinder engine. In the crankshaft 1A, a gear press-fitting portion 4 (hereinafter referred to as a heating suppression portion 4 as needed) is formed in the sixth arm portion 3 counted from the output shaft 2 side (left side in FIG. 2). On the other hand, in the crankshaft 1B, a gear press-fit portion 4 is formed in the third arm portion 3 counted from the output shaft 2 side (left side in FIG. 3). Each gear press-fit portion 4 of the crankshafts 1A and 1B has a larger volume and a smaller coil gap with respect to the high-frequency induction heating coil 5 than the other arm portions 3 where the gear press-fit portion 4 is not formed. The crankshaft 1 </ b> A and the crankshaft 1 </ b> B have the same outer shape (dimensions) in other portions except that the position of the gear press-fit portion 4 is different.

図１に示されるように、高周波熱処理装置は、非磁性体の良導体によって構成された線材が一定の巻径で螺旋状に巻かれて形成された中空の高周波誘導加熱コイル５を有する。また、高周波熱処理装置は、非磁性体の良導体によって構成されて高周波誘導加熱コイル５の外周に配置される加熱抑制コイル６を有する。加熱抑制コイル６は、コイル巻数が１であるとともに、内径が高周波誘導加熱コイル５の外径よりも大きく形成されている。なお、高周波誘導加熱コイル５の軸線（中心線）と加熱抑制コイル６の軸線とは一致する。   As shown in FIG. 1, the high-frequency heat treatment apparatus has a hollow high-frequency induction heating coil 5 formed by winding a wire made of a non-magnetic good conductor spirally with a constant winding diameter. The high-frequency heat treatment apparatus includes a heating suppression coil 6 that is configured by a nonmagnetic good conductor and disposed on the outer periphery of the high-frequency induction heating coil 5. The heating suppression coil 6 has a coil winding number of 1 and an inner diameter larger than the outer diameter of the high-frequency induction heating coil 5. Note that the axis (center line) of the high-frequency induction heating coil 5 and the axis of the heating suppression coil 6 coincide.

また、高周波熱処理装置は、加熱抑制コイル６を高周波誘導加熱コイル５に対して軸線方向へ移動及び位置決めさせる位置決め手段を備えている。位置決め手段は、例えば、直動ガイド、ボールねじ、サーボモータ及び制御装置を含んで構成される公知技術を採用して構成することができる。また、加熱抑制コイル６を高周波誘導加熱コイル５に対して手動で移動及び位置決めさせるように位置決め手段を構成することもできる。   In addition, the high frequency heat treatment apparatus includes positioning means for moving and positioning the heating suppression coil 6 in the axial direction with respect to the high frequency induction heating coil 5. The positioning means can be configured by adopting a known technique including, for example, a linear motion guide, a ball screw, a servo motor, and a control device. Further, the positioning means can be configured to manually move and position the heating suppression coil 6 with respect to the high frequency induction heating coil 5.

また、高周波熱処理装置は、高周波誘導加熱コイル５を一方向（図１におけるＷ１）へ流れる高周波電流を高周波誘導加熱コイル５に印加するとともに、高周波誘導加熱コイル５に印加される高周波電流に対して逆方向（図１におけるＷ２）へ流れる高周波電流を加熱抑制コイル６に印加する高周波電源を有する。この高周波電源は、高周波誘導加熱コイル５に印加される高周波電流の周波数と加熱抑制コイル６に印加される高周波電流の周波数とを個別に設定することが可能である。   The high-frequency heat treatment apparatus applies a high-frequency current flowing in one direction (W1 in FIG. 1) through the high-frequency induction heating coil 5 to the high-frequency induction heating coil 5, and against the high-frequency current applied to the high-frequency induction heating coil 5. A high-frequency power source that applies a high-frequency current flowing in the reverse direction (W2 in FIG. 1) to the heating suppression coil 6 is provided. This high frequency power supply can individually set the frequency of the high frequency current applied to the high frequency induction heating coil 5 and the frequency of the high frequency current applied to the heating suppression coil 6.

次に、本実施形態の作用を説明する。
まず、クランクシャフト１Ａを焼戻する場合を説明する。最初に、高周波誘導加熱コイル５内にクランクシャフト１Ａをセットする。次に、位置決め手段によって、加熱抑制コイル６を予め決められた位置に位置決めさせる。これにより、図４に示されるように、加熱抑制コイル６は、高周波誘導加熱コイル５を介在させてクランクシャフト１Ａのギア圧入部４に対向する。当然、高周波誘導加熱コイル５内にクランクシャフト１Ａをセットする前に、位置決め手段によって加熱抑制コイル６を予め決められた位置に位置決めさせることが可能である。この状態で、高周波誘導加熱コイル５に高周波電流を印加するとともに、高周波誘導加熱コイル５に高周波電流を印加している間、加熱抑制コイル６に、高周波誘導加熱コイル５に印加された高周波電流の方向（図１におけるＷ１）に対して逆方向（図１におけるＷ２）の高周波電流を印加する。 Next, the operation of this embodiment will be described.
First, the case where the crankshaft 1A is tempered will be described. First, the crankshaft 1 </ b> A is set in the high frequency induction heating coil 5. Next, the heating suppression coil 6 is positioned at a predetermined position by positioning means. Thereby, as FIG. 4 shows, the heating suppression coil 6 opposes the gear press-fit part 4 of the crankshaft 1A with the high frequency induction heating coil 5 interposed. Naturally, before setting the crankshaft 1A in the high frequency induction heating coil 5, the heating suppression coil 6 can be positioned at a predetermined position by the positioning means. In this state, a high-frequency current is applied to the high-frequency induction heating coil 5 and a high-frequency current applied to the high-frequency induction heating coil 5 is applied to the heating suppression coil 6 while the high-frequency current is applied to the high-frequency induction heating coil 5. A high-frequency current in the opposite direction (W2 in FIG. 1) is applied to the direction (W1 in FIG. 1).

このように、加熱抑制コイル６に、高周波誘導加熱コイル５に印加する高周波電流に対して逆方向の高周波電流を印加することにより、加熱抑制コイル６の磁束は、高周波誘導加熱５コイルの磁束を打ち消すように作用する。これにより、高周波誘導加熱コイル５の加熱能力を調節、すなわち、ギア圧入部４に対応する部位で部分的に低下させることができ、ギア圧入部４のジュール発熱を抑制することができる。その結果、相対的に体積が大きくコイルギャップが小さいギア圧入部４のオーバーヒートを回避することが可能であり、クランクシャフト１Ａを均一に焼戻（高周波熱処理）することができる。   In this way, by applying a high-frequency current in the opposite direction to the high-frequency current applied to the high-frequency induction heating coil 5 to the heating suppression coil 6, the magnetic flux of the heating suppression coil 6 becomes the magnetic flux of the high-frequency induction heating 5 coil. Acts to counteract. Thereby, the heating capability of the high frequency induction heating coil 5 can be adjusted, that is, it can be partially reduced at a portion corresponding to the gear press-fitting portion 4, and Joule heat generation at the gear press-fitting portion 4 can be suppressed. As a result, it is possible to avoid overheating of the gear press-fit portion 4 having a relatively large volume and a small coil gap, and the crankshaft 1A can be tempered uniformly (high-frequency heat treatment).

次に、クランクシャフト１Ｂを焼戻する場合を説明する。なお、前述したクランクシャフト１Ａを焼戻する場合と重複する説明は省略する。
まず、高周波誘導加熱コイル５内にクランクシャフト１Ｂをセットする。次に、位置決め手段によって、加熱抑制コイル６を予め決められた位置に位置決めさせる。これにより、加熱抑制コイル６は、図５に示されるように、高周波誘導加熱コイルを介在させてクランクシャフト１Ｂのギア圧入部４（加熱抑制部）に対向する。この状態で、高周波誘導加熱コイル５に高周波電流を印加するとともに、高周波誘導加熱コイル５に高周波電流を印加している間、加熱抑制コイル６に、高周波誘導加熱コイル５に印加された高周波電流の方向（図１におけるＷ１）に対して逆方向（図１におけるＷ２）の高周波電流を印加することにより、クランクシャフト１Ｂを均一に焼戻することができる。 Next, a case where the crankshaft 1B is tempered will be described. In addition, the description which overlaps with the case where tempering the crankshaft 1A mentioned above is abbreviate | omitted.
First, the crankshaft 1B is set in the high frequency induction heating coil 5. Next, the heating suppression coil 6 is positioned at a predetermined position by positioning means. Thereby, the heating suppression coil 6 is opposed to the gear press-fitting portion 4 (heating suppression portion) of the crankshaft 1B with the high-frequency induction heating coil interposed, as shown in FIG. In this state, a high-frequency current is applied to the high-frequency induction heating coil 5 and a high-frequency current applied to the high-frequency induction heating coil 5 is applied to the heating suppression coil 6 while the high-frequency current is applied to the high-frequency induction heating coil 5. The crankshaft 1B can be tempered uniformly by applying a high-frequency current in the opposite direction (W2 in FIG. 1) to the direction (W1 in FIG. 1).

この実施形態では以下の効果を奏する。
本実施形態によれば、高周波誘導加熱コイル５の外周に配置した加熱抑制コイル６を位置決め手段によって移動及び位置決めさせて、加熱抑制コイル６を高周波誘導加熱コイル５内の被加熱体１（本実施形態では、ギア圧入部４の位置が異なるクランクシャフト１Ａ及び１Ｂ）の加熱抑制部４（本実施形態では、ギア圧入部４）に対向させた状態で、高周波誘導加熱コイル５に高周波電流を印加するとともに、加熱抑制コイル６に、高周波誘導加熱コイル５に印加する高周波電流に対して逆方向の高周波電流を印加することにより、高周波誘導加熱コイル５の加熱能力を部分的に調節した（低下させた）ので、被加熱体１の部分的なオーバーヒートを抑制して、被加熱体１を均一に熱処理（本実施形態では、焼戻）することができる。さらに、形状が異なる複数種類の被加熱体１の熱処理（焼戻）を同一設備で実施することができるため、当て金を製品（被加熱体１）毎に製作することを要する公知技術と比較した場合、設備コストを大幅に削減することができ、且つ、新規の製品（被加熱体）の熱処理を実施する場合も迅速な対応が可能である。 This embodiment has the following effects.
According to the present embodiment, the heating suppression coil 6 disposed on the outer periphery of the high frequency induction heating coil 5 is moved and positioned by the positioning means, and the heating suppression coil 6 is heated in the high frequency induction heating coil 5 (this embodiment 1). In the embodiment, a high frequency current is applied to the high frequency induction heating coil 5 in a state where the gear press fitting portion 4 is opposed to the heating suppression portion 4 (in this embodiment, the gear press fit portion 4) of the crankshafts 1A and 1B). At the same time, by applying a high-frequency current in the opposite direction to the high-frequency current applied to the high-frequency induction heating coil 5 to the heating suppression coil 6, the heating capability of the high-frequency induction heating coil 5 is partially adjusted (reduced). Therefore, partial overheating of the heated body 1 can be suppressed, and the heated body 1 can be uniformly heat-treated (tempered in this embodiment). Furthermore, since heat treatment (tempering) of a plurality of types of heated objects 1 having different shapes can be carried out with the same equipment, it is compared with a known technique that requires a metal plate to be manufactured for each product (heated object 1). In this case, the equipment cost can be greatly reduced, and a quick response is possible even when a new product (object to be heated) is heat-treated.

なお、前述した実施形態は、以下の点に留意されたい。
被加熱体１は、クランクシャフト１Ａ、１Ｂに限定されない。
熱処理は、焼戻に限定されるものではない。本実施形態は、例えば、高周波焼入に適用することができる。
本実施形態では、加熱抑制コイル６の巻数を１としたが、加熱抑制コイル６の巻数は、必要に応じて適宜決定することができる。
本実施形態では、加熱抑制コイル６に、高周波誘導加熱コイル５に印加された高周波電流の流れ方向に対して逆方向へ流れる高周波電流を印加したが、加熱抑制コイル６に高周波電流を印加することは必須ではない。加熱抑制コイル６に高周波電流を印加しない場合、高周波誘導加熱コイル５に高周波電流を印加すると、加熱抑制コイル６には、高周波誘導加熱コイル５に流れる高周波電流に対して逆方向の誘導電流が流れる。この誘導電流によって生じる加熱抑制コイル６の磁束は、高周波誘導加熱コイル５の磁束を打ち消すように作用する。
本実施形態では、加熱抑制コイル６を高周波誘導加熱コイル５の外周に配置したが、加熱抑制コイル６は、高周波誘導加熱コイル５の内周に配置することができる。加熱抑制コイル６を高周波誘導加熱コイル５の内周に配置した場合、加熱抑制コイル６を高周波誘導加熱コイル５の外周に配置した場合と比較して、加熱抑制コイル６の磁束によって打ち消される高周波誘導加熱コイル５の磁束が増大するので、加熱抑制部４のジュール発熱をより効果的に抑制することができる。 It should be noted that the above-described embodiment has the following points.
The heated body 1 is not limited to the crankshafts 1A and 1B.
The heat treatment is not limited to tempering. This embodiment can be applied to induction hardening, for example.
In the present embodiment, the number of turns of the heating suppression coil 6 is set to 1, but the number of turns of the heating suppression coil 6 can be appropriately determined as necessary.
In this embodiment, the high-frequency current that flows in the opposite direction to the flow direction of the high-frequency current applied to the high-frequency induction heating coil 5 is applied to the heating suppression coil 6, but the high-frequency current is applied to the heating suppression coil 6. Is not required. When a high frequency current is not applied to the heating suppression coil 6, when a high frequency current is applied to the high frequency induction heating coil 5, an induction current flows in the opposite direction to the high frequency current flowing in the high frequency induction heating coil 5. . The magnetic flux of the heating suppression coil 6 generated by this induction current acts so as to cancel the magnetic flux of the high frequency induction heating coil 5.
In the present embodiment, the heating suppression coil 6 is disposed on the outer periphery of the high-frequency induction heating coil 5, but the heating suppression coil 6 can be disposed on the inner periphery of the high-frequency induction heating coil 5. When the heating suppression coil 6 is arranged on the inner periphery of the high frequency induction heating coil 5, compared with the case where the heating suppression coil 6 is arranged on the outer periphery of the high frequency induction heating coil 5, the high frequency induction canceled by the magnetic flux of the heating suppression coil 6. Since the magnetic flux of the heating coil 5 increases, the Joule heat generation of the heating suppression unit 4 can be suppressed more effectively.

１ 被加熱体（クランクシャフト１Ａ、１Ｂ）、２ 出力軸、３ アーム部、４ 加熱抑制部（ギア圧入部）、５ 高周波誘導加熱コイル、６ 加熱抑制コイル DESCRIPTION OF SYMBOLS 1 To-be-heated body (crankshaft 1A, 1B), 2 output shaft, 3 arm part, 4 heating suppression part (gear press-fit part), 5 high frequency induction heating coil, 6 heating suppression coil

Claims (4)

螺旋状に巻かれた中空の高周波誘導加熱コイルを備えて、前記高周波誘導加熱コイルに高周波電流が印加されることで、前記高周波誘導加熱コイル内に配置された被加熱体が高周波誘導加熱される高周波熱処理装置であって、
前記高周波誘導加熱コイルの外周又は内周に配置されて非磁性体の良導体によって構成される加熱抑制コイルと、
前記加熱抑制コイルを前記被加熱体に対して位置決めさせる位置決め手段と、
を有することを特徴とする高周波熱処理装置。 A hollow high-frequency induction heating coil wound in a spiral shape is provided, and a high-frequency current is applied to the high-frequency induction heating coil, so that the object to be heated arranged in the high-frequency induction heating coil is high-frequency induction heated. An induction heat treatment apparatus,
A heating suppression coil disposed on the outer periphery or inner periphery of the high-frequency induction heating coil and constituted by a non-magnetic good conductor;
Positioning means for positioning the heating suppression coil with respect to the object to be heated;
A high frequency heat treatment apparatus characterized by comprising: 前記加熱抑制コイルに、前記高周波誘導加熱コイルに印加される高周波電流に対して逆方向の高周波電流が印加されることを特徴とする請求項１に記載された高周波熱処理装置。 The high frequency heat treatment apparatus according to claim 1, wherein a high frequency current in a direction opposite to a high frequency current applied to the high frequency induction heating coil is applied to the heating suppression coil. 螺旋状に巻かれた中空の高周波誘導加熱コイルに高周波電流を印加して、前記高周波誘導加熱コイル内に配置された被加熱体を高周波誘導加熱させる高周波熱処理方法であって、
前記高周波誘導加熱コイルの外周又は内周に、非磁性体の良導体によって構成される加熱抑制コイルを設けておいて、
前記被加熱体を前記高周波誘導加熱コイル内に配置するとともに前記加熱抑制コイルを前記被加熱体の発熱量を抑制したい部分に対向させて配置して、この状態で前記高周波誘導加熱コイルに高周波電流を印加することを特徴とする高周波熱処理方法。 A high-frequency heat treatment method in which a high-frequency current is applied to a hollow high-frequency induction heating coil wound in a spiral shape, and a heated object placed in the high-frequency induction heating coil is heated by high-frequency induction,
On the outer periphery or inner periphery of the high-frequency induction heating coil, a heating suppression coil configured by a nonmagnetic good conductor is provided,
The object to be heated is disposed in the high frequency induction heating coil, and the heating suppression coil is disposed to face a portion of the object to be heated to suppress the amount of heat generated, and in this state, the high frequency induction heating coil has a high frequency current. A high frequency heat treatment method characterized by applying 前記高周波誘導加熱コイルに高周波電流を印加している間、前記加熱抑制コイルに、前記高周波誘導加熱コイルに印加する高周波電流に対して逆方向の高周波電流を印加することを特徴とする請求項３に記載された高周波熱処理方法。 4. A high frequency current in a direction opposite to a high frequency current applied to the high frequency induction heating coil is applied to the heating suppression coil while a high frequency current is applied to the high frequency induction heating coil. The high-frequency heat treatment method described in 1.
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CN106793229A (en) * 2016-12-15 2017-05-31 鹤山市运通新能源科技有限公司 A kind of high-frequency heating apparatus
KR20180062892A (en) * 2016-12-01 2018-06-11 주식회사 파인에바 Heating assembly
WO2018101802A3 (en) * 2016-12-01 2018-07-26 주식회사 파인에바 Heating assembly

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KR20180062892A (en) * 2016-12-01 2018-06-11 주식회사 파인에바 Heating assembly
WO2018101802A3 (en) * 2016-12-01 2018-07-26 주식회사 파인에바 Heating assembly
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CN106793229A (en) * 2016-12-15 2017-05-31 鹤山市运通新能源科技有限公司 A kind of high-frequency heating apparatus

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