JP2011063831A - High frequency induction heating apparatus - Google Patents

High frequency induction heating apparatus Download PDF

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JP2011063831A
JP2011063831A JP2009213859A JP2009213859A JP2011063831A JP 2011063831 A JP2011063831 A JP 2011063831A JP 2009213859 A JP2009213859 A JP 2009213859A JP 2009213859 A JP2009213859 A JP 2009213859A JP 2011063831 A JP2011063831 A JP 2011063831A
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power supply
heating coil
annealing
quenching
high frequency
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Tsutomu Miyazaki
力 宮崎
Eiji Suzuki
英司 鈴木
Shigechika Kawashima
茂義 川嶋
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Miyaden Co Ltd
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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
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    • Y02P10/00—Technologies related to metal processing
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency induction heating apparatus in which hardening and annealing of a workpiece can be performed in an almost continuous one operating cycle, with which hardening and annealing operation efficiency can be improved, and with which good hardening and annealing quality can easily obtained. <P>SOLUTION: The high frequency induction heating apparatus is provided with: a heating coil disposed in the hardening and annealing part of the workpiece supported by a supporting means; a high frequency power source device which supplies the high frequency current of a prescribed frequency to the heating coil; a cooling means which can cool the workpiece; and a control means which controls them. The high frequency power source device is provided with a first power source means which can supply the high frequency current for hardening to the heating coil, and a second power source means which can supply the high frequency current for annealing to the heating coil. The control means controls the first power source means and the cooling means to harden the workpiece, and controls the second power source means in a state of nearly continued with the hardening to anneal the workpiece. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、各種ワークの高周波誘導加熱による焼入れと焼鈍しを、１台の加熱装置により略連続的に行うことが可能な高周波誘導加熱装置に関する。   The present invention relates to a high-frequency induction heating apparatus capable of substantially continuously quenching and annealing various workpieces by high-frequency induction heating with a single heating apparatus.

一般的に、例えばターボチャージャー用のタービン軸等のワークにおいて、その外周面の所定部位を焼入れしたり焼鈍しする場合には、所定周波数の高周波電流により、前記所定部位に渦電流を誘起させて誘導加熱する高周波誘導加熱装置が使用されている。従来、このような高周波誘導加熱装置は、加熱コイルと、冷却手段、及び焼入れもしくは焼鈍しに適した所定周波数の高周波電流をそれぞれ発生可能な高周波電源としてのインバータ回路等を有している。   Generally, in a workpiece such as a turbine shaft for a turbocharger, when quenching or annealing a predetermined portion of the outer peripheral surface, an eddy current is induced in the predetermined portion by a high-frequency current having a predetermined frequency. A high frequency induction heating apparatus for induction heating is used. Conventionally, such a high frequency induction heating apparatus has a heating coil, a cooling means, an inverter circuit as a high frequency power source capable of generating a high frequency current of a predetermined frequency suitable for quenching or annealing, and the like.

そして、焼入れする際には、焼入れに適した周波数の高周波電流をインバータ回路から加熱コイルに供給して誘導加熱すると共に、冷却手段の冷却水により加熱部分を急速冷却することでワークを焼入れし、また、焼鈍しする際には、焼鈍しに適した周波数の高周波電流をインバータ回路から加熱コイルに供給して誘導加熱することでワークを焼鈍しするようになっている。なお、この種の高周波誘導加熱装置としては、例えば特許文献１が開示されている。   And, when quenching, the high frequency current of a frequency suitable for quenching is supplied from the inverter circuit to the heating coil to perform induction heating, and the workpiece is quenched by rapidly cooling the heated portion with the cooling water of the cooling means, Moreover, when annealing, the workpiece | work is annealed by supplying the high frequency current of the frequency suitable for annealing to a heating coil from an inverter circuit, and carrying out induction heating. As this type of high-frequency induction heating device, for example, Patent Document 1 is disclosed.

特開２００６−３４４２１号公報JP 2006-34421 A

しかしながら、このような高周波誘導加熱装置にあっては、ワークの焼入れと焼鈍しが別々の条件設定で行われるか、あるいは別々の誘導加熱装置で行われるようになっていることから、例えばワークの焼入れ後に続けて焼鈍しを行う場合に、誘導加熱装置を一旦停止させて、インバータ回路の高周波電流の周波数を設定し直す必要があったり、別の誘導加熱装置を作動させて行う必要がある。そのため、ワークの焼入れと焼鈍しを略連続した一つの作業サイクル内で行うことができず、作業能率が劣ると共に、ワークの所定部位に良好な焼入れ焼鈍し品質を得ることが難しいという問題点を有している。   However, in such a high-frequency induction heating apparatus, the workpiece is quenched and annealed under different condition settings, or is performed by separate induction heating apparatuses. When performing annealing after quenching, it is necessary to temporarily stop the induction heating device and reset the frequency of the high-frequency current of the inverter circuit, or to operate another induction heating device. Therefore, the work hardening and annealing cannot be performed in one continuous work cycle, the work efficiency is inferior, and it is difficult to obtain good quenching and annealing quality at a predetermined part of the work. Have.

本発明は、このような事情に鑑みてなされたもので、その目的は、ワークの焼入れと焼鈍しを略連続した一つの作業サイクル内で行うことができて、役入れ焼鈍し作業の能率向上を図ると共に、良好な焼入れ焼鈍し品質を容易に得ることが可能な高周波誘導加熱装置を提供することにある。   The present invention has been made in view of such circumstances, and the purpose thereof is to improve the efficiency of the work-annealing work by quenching and annealing the work in one continuous work cycle. It is another object of the present invention to provide a high-frequency induction heating apparatus capable of easily obtaining good quenching and annealing quality.

かかる目的を達成すべく、本発明のうち請求項１に記載の発明は、支持手段で支持されたワークの焼入れ焼鈍し部位に配置された加熱コイルと、該加熱コイルに所定周波数の高周波電流を供給する高周波電源装置と、前記ワークを冷却可能な冷却手段と、これらを制御する制御手段と、を備え、前記高周波電源装置は、焼入れ用の高周波電流を前記加熱コイルに供給可能な第１電源手段と、焼鈍し用の高周波電流を前記加熱コイルに供給可能な第２電源手段を有し、前記制御手段は、前記第１電源手段と冷却手段を制御してワークを焼入れすると共に、該焼入れに略連続状態で前記第２電源手段を制御してワークを焼鈍しすることを特徴とする。   In order to achieve such an object, the invention described in claim 1 of the present invention includes a heating coil disposed at a quenching and annealing portion of a work supported by a supporting means, and a high-frequency current having a predetermined frequency applied to the heating coil. A first power source capable of supplying a quenching high-frequency current to the heating coil; and a high-frequency power device to be supplied; a cooling unit capable of cooling the workpiece; and a control unit for controlling the cooling unit. And a second power supply means capable of supplying a high frequency current for annealing to the heating coil, and the control means quenches the workpiece by controlling the first power supply means and the cooling means, and the quenching The workpiece is annealed by controlling the second power supply means in a substantially continuous state.

また、請求項２に記載の発明は、前記加熱コイルが、ワークの焼入れ焼鈍し部位に沿って移動可能に配設されると共に、焼入れ時にワークに冷却水を噴射可能な冷却ジャケットを有することを特徴とする。さらに、請求項３に記載の発明は、前記高周波電源装置が、前記第１電源手段としての第１インバータ及び第２電源手段としての第２インバータと、これらに接続された切替器を有し、該切替器が前記制御手段で制御されることにより、加熱コイルに第１インバータと第２インバータのいずれから高周波電流が供給されることを特徴とする。また、請求項４に記載の発明は、前記高周波電源装置の、前記第１電源手段がインバータ回路と第１発振回路で形成され、前記第２電源手段が前記インバータ回路と第２発振回路とで形成され、前記制御手段の制御で第１発振回路と第２発振回路のいずれかを作動させることにより、インバータ回路から所定周波数の高周波電流が前記加熱コイルに供給されることを特徴とする。   The invention according to claim 2 is characterized in that the heating coil is disposed so as to be movable along the quenching and annealing part of the workpiece and has a cooling jacket capable of injecting cooling water onto the workpiece at the time of quenching. Features. Further, in the invention according to claim 3, the high-frequency power supply device includes a first inverter as the first power supply means and a second inverter as the second power supply means, and a switch connected to them. The switching device is controlled by the control means, whereby a high-frequency current is supplied to the heating coil from either the first inverter or the second inverter. According to a fourth aspect of the present invention, in the high frequency power supply device, the first power supply means is formed by an inverter circuit and a first oscillation circuit, and the second power supply means is formed by the inverter circuit and the second oscillation circuit. The high frequency current of a predetermined frequency is supplied from the inverter circuit to the heating coil by operating either the first oscillation circuit or the second oscillation circuit under the control of the control means.

本発明のうち請求項１に記載の発明によれば、高周波電源装置が焼入れ用の第１電源手段と焼鈍し用の第２電源手段を有し、制御手段が第１電源手段と冷却手段を制御してワークを焼入れすると共に、該焼入れに略連続状態で第２電源手段を制御して焼入れ部分を焼鈍しするため、ワークの焼入れと焼鈍しを１台の装置で略連続した一つの作業サイクル内で行うことができて、焼入れ焼鈍し作業の能率向上を図ることができると共に、ワークの焼入れ焼鈍し部位に良好な品質の焼入れ焼鈍し状態を容易に得ることができる。   According to the first aspect of the present invention, the high-frequency power supply device has a first power supply means for quenching and a second power supply means for annealing, and the control means comprises the first power supply means and the cooling means. Work is controlled and hardened, and the second power supply means is controlled in a substantially continuous state to quench the hardened portion, so that the work is hardened and annealed substantially continuously with one device. This can be carried out within the cycle, so that the efficiency of the quenching and annealing operation can be improved, and a good quality quenching and annealing state can be easily obtained at the quenching and annealing part of the workpiece.

また、請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、加熱コイルが焼入れ焼鈍し部位に沿って移動可能に配設されると共に冷却ジャケットを有するため、例えば棒状ワークの所定長さの焼入れ焼鈍し部位の焼入れ焼鈍し作業を加熱コイルを移動させながら行うことができて、その作業の能率を一層向上させることができる。   Further, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the heating coil is arranged to be movable along the quenching and annealing portion and has the cooling jacket, for example, Quenching and annealing of a predetermined length of the rod-shaped workpiece can be performed while moving the heating coil, and the efficiency of the operation can be further improved.

さらに、請求項３に記載の発明によれば、請求項１または２に記載の発明の効果に加え、高周波電源装置が第１インバータ及び第２インバータと切替器を有し、制御手段による切替器の制御で第１インバータもしくは第２インバータから加熱コイルに高周波電流が供給されるため、焼入れ用の高周波電流と焼鈍し用の高周波電流を加熱コイルに確実に供給することができる。   Further, according to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the high-frequency power supply device includes the first inverter, the second inverter, and a switch, and the switch by the control means. Since the high-frequency current is supplied from the first inverter or the second inverter to the heating coil by the above control, the high-frequency current for quenching and the high-frequency current for annealing can be reliably supplied to the heating coil.

また、請求項４に記載の発明によれば、請求項１または２に記載の発明の効果に加え、高周波電源装置がインバータ回路と第１発振回路及び第２発振回路を有し、制御手段の制御で第１発振回路もしくは第２発振回路が作動してインバータ回路から加熱コイルに高周波電流が供給されるため、高周波電源装置のインバータ回路の数を減らして、該電源装置の構成を簡略化して安価な高周波誘導加熱装置を得ることができる。   According to the invention described in claim 4, in addition to the effect of the invention described in claim 1 or 2, the high frequency power supply device includes an inverter circuit, a first oscillation circuit, and a second oscillation circuit, Since the high frequency current is supplied from the inverter circuit to the heating coil by the operation of the first oscillation circuit or the second oscillation circuit, the number of inverter circuits of the high frequency power supply device is reduced and the configuration of the power supply device is simplified. An inexpensive high-frequency induction heating device can be obtained.

本発明に係わる高周波誘導加熱装置の概略構成図Schematic configuration diagram of a high-frequency induction heating apparatus according to the present invention 同その高周波電源装置の概略構成図Schematic configuration diagram of the high frequency power supply device 同加熱コイルの一例を示す平面図Plan view showing an example of the heating coil 同図３のＡ−Ａ線に沿った断面図Sectional view along the AA line of FIG. 同焼入れ焼鈍し作業の一例を示す工程図Process diagram showing an example of the same annealing process

以下、本発明を実施するための最良の形態を図面に基づいて詳細に説明する。
図１〜図５は、本発明に係わる高周波誘導加熱装置の一実施形態を示している。図１に示すように、高周波誘導加熱装置１は、例えばタービン軸からなるワークＷの上下端部を支持する支持手段としての上下の支持部材２、３と、この両支持部材２、３を所定方向に移動（作動）させてワークＷをクランプするクランプ装置４と、ワークＷの焼入れ焼鈍し部位Ｗａの外周側に配置された加熱コイル５と、この加熱コイル５を前記焼入れ焼鈍し部位Ｗａに沿って移動させるコイル移動装置６と、加熱コイル５に設けた後述する冷却水流路１８に冷却水を供給する冷却水供給装置７と、前記加熱コイル５に２種類の所定周波数の高周波電流を供給する高周波電源装置８と、制御手段としての制御装置９等を備えている。 The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
1-5 has shown one Embodiment of the high frequency induction heating apparatus concerning this invention. As shown in FIG. 1, the high frequency induction heating apparatus 1 includes upper and lower support members 2 and 3 as support means for supporting upper and lower end portions of a work W made of, for example, a turbine shaft, and both the support members 2 and 3. The clamping device 4 that moves (actuates) the workpiece W in the direction and clamps the workpiece W, the heating coil 5 disposed on the outer peripheral side of the quenching and annealing part Wa of the workpiece W, and the heating coil 5 to the quenching and annealing part Wa A coil moving device 6 that is moved along, a cooling water supply device 7 that supplies cooling water to a cooling water flow path 18 (described later) provided in the heating coil 5, and two high-frequency currents of two predetermined frequencies are supplied to the heating coil 5. A high-frequency power supply device 8 for controlling, a control device 9 as control means, and the like.

前記制御装置９は、ＣＰＵ９ａ、ＲＯＭ９ｂ、ＲＡＭ９ｃ等を有し、その入力側には、加熱コイル５の下端位置と上端位置とを検知可能なセンサ１０ａ、１０ｂや図示しない入力装置が接続され、その出力側には、前記クランプ装置４、高周波電源装置８、冷却水供給装置７及びコイル移動装置６等が接続されている。そして、後述する如く、センサ１０ａ、１０ｂからの検知信号や入力装置による入力データに基づいて、高周波電源装置８や冷却水供給装置７及びコイル移動装置６等の作動を制御するようになっている。   The control device 9 includes a CPU 9a, a ROM 9b, a RAM 9c, and the like. Sensors 10a and 10b capable of detecting the lower end position and the upper end position of the heating coil 5 and an input device (not shown) are connected to the input side thereof. On the output side, the clamp device 4, the high frequency power supply device 8, the cooling water supply device 7, the coil moving device 6 and the like are connected. As will be described later, the operations of the high-frequency power supply device 8, the cooling water supply device 7, the coil moving device 6 and the like are controlled based on detection signals from the sensors 10a and 10b and input data from the input device. .

前記高周波電源装置８は、図２（ａ）に示すように、焼入れ用の高周波電流を発生可能な第１電源手段としての第１インバータ１１ａと、焼鈍し用の高周波電流を発生可能な第２電源手段としての第２インバータ１１ｂと、この両インバータ１１ａ、１１ｂの出力端子に接続された切替器１２等を有している。第１インバータ１１ａ及び第２インバータ１１ｂは、トランジスタ、ＭＯＳＦＥＴ、ＩＧＢＴ等の半導体スイッチング素子を、例えばフルブリッジ接続したインバータ回路で構成され、その入力側が前記制御装置９に接続され、その出力側が所定形態の切替器１２の一方の入力端子にそれぞれ接続されている。   As shown in FIG. 2A, the high frequency power supply 8 includes a first inverter 11a as a first power supply means capable of generating a high frequency current for quenching, and a second inverter capable of generating a high frequency current for annealing. It has the 2nd inverter 11b as a power supply means, the switch 12 etc. which were connected to the output terminal of both these inverters 11a and 11b. The first inverter 11a and the second inverter 11b are composed of an inverter circuit in which semiconductor switching elements such as transistors, MOSFETs, and IGBTs are connected in a full bridge, for example, and the input side thereof is connected to the control device 9, and the output side thereof is in a predetermined form. Are connected to one input terminal of each switch 12.

また、切替器１２の出力端子は、図示しない銅板やケーブル等の導体を介して前記加熱コイル５に接続されている。そして、この高周波電源装置８は、制御装置９からの制御信号により、第１インバータ１１ａと第２インバータ１１ｂが作動状態に設定されると共に、制御装置９の制御信号で切替器１２が所定側に切替えられることにより、第１インバータ１１ａによる高周波電流かもしくは第２インバータ１１ｂによる高周波電流が加熱コイル５に供給、すなわち加熱コイル５に第１インバータ１１ａによる焼入れ用の高周波電流かもしくは第２インバータ１１ｂによる焼鈍し用の高周波電流が供給されるようになっている。   The output terminal of the switch 12 is connected to the heating coil 5 via a conductor such as a copper plate or a cable (not shown). In the high-frequency power supply device 8, the first inverter 11 a and the second inverter 11 b are set to the operating state by the control signal from the control device 9, and the switch 12 is set to the predetermined side by the control signal from the control device 9. By switching, the high frequency current by the first inverter 11a or the high frequency current by the second inverter 11b is supplied to the heating coil 5, that is, the heating coil 5 is a high frequency current for quenching by the first inverter 11a or by the second inverter 11b. A high frequency current for annealing is supplied.

なお、高周波電源装置８は、この構成に限定されず、例えば図２（ｂ）に示すように、構成することもできる。すなわち、この高周波電源装置８は、半導体スイッチング素子のフルブリッジ接続による一つのインンバータ回路１３と、このインバータ回路１３を作動（オン・オフ）させる第１発振回路１４ａ及び第２発振回路１４ｂと、両発振回路１４ａ、１４ｂとインバータ回路１３間に接続された切替器１５等を有している。この例の場合、インバータ回路１３と第１発振回路１４ａにより第１電源手段が形成され、インバータ回路１３と第２発振回路１４ｂにより第２電源手段が形成されている。   The high-frequency power supply device 8 is not limited to this configuration, and may be configured as shown in FIG. 2B, for example. That is, the high-frequency power supply device 8 includes one inverter circuit 13 based on a full bridge connection of semiconductor switching elements, a first oscillation circuit 14a and a second oscillation circuit 14b that operate (turn on / off) the inverter circuit 13, and both A switch 15 connected between the oscillation circuits 14a and 14b and the inverter circuit 13 is provided. In this example, the inverter circuit 13 and the first oscillation circuit 14a form a first power supply unit, and the inverter circuit 13 and the second oscillation circuit 14b form a second power supply unit.

そして、制御装置９の制御信号によりインバータ回路１３と両発振回路１４ａ、１４ｂを作動状態に設定すると共に、制御装置９の制御信号で切替器１５を所定側に切替えることにより、インバータ回路１３の発振周波数が所定に設定される。これにより、インバータ回路１３の出力端子から加熱コイル５に供給される高周波電流が第１発振回路１４ａによる焼入れ用の高周波電流かもしくは第２発振回路１４ｂによる焼鈍し用の高周波電流に設定されることになる。   Then, the inverter circuit 13 and the two oscillation circuits 14a and 14b are set to the operating state by the control signal of the control device 9, and the switch 15 is switched to a predetermined side by the control signal of the control device 9, thereby oscillating the inverter circuit 13. The frequency is set to a predetermined value. Thereby, the high frequency current supplied from the output terminal of the inverter circuit 13 to the heating coil 5 is set to the high frequency current for quenching by the first oscillation circuit 14a or the high frequency current for annealing by the second oscillation circuit 14b. become.

なお、この例の場合は、切替器１５の接続は、両発振回路１４ａ、１４ｂとインバータ回路１３間に限らず、図２（ｂ）の二点鎖線で示すように、両発振回路１４ａ、１４ｂの入力側に接続することも可能である。この例の切替器１５としては、切替器１５自体に高電流が流れないため、例えば応答性（切替性）の良好な半導体スイッチ等を使用することができる。このように、高周波電源装置８としては、焼入れ用の高周波電流と焼鈍し用の高周波電流を加熱コイル５に供給可能であれば良く、例えば１つのインバータ回路や発振回路を備えて、その発振周波数を決定する電気部品の特性値を切り替えることにより、２種類の周波数の高周波電流を発生させる構成とする等、適宜の回路構成を採用することができる。   In the case of this example, the connection of the switch 15 is not limited to between the two oscillation circuits 14a and 14b and the inverter circuit 13, but as shown by the two-dot chain line in FIG. 2B, both the oscillation circuits 14a and 14b. It is also possible to connect to the input side. As the switch 15 of this example, since a high current does not flow through the switch 15 itself, for example, a semiconductor switch having good response (switchability) can be used. As described above, the high-frequency power supply device 8 only needs to be able to supply the quenching high-frequency current and the annealing high-frequency current to the heating coil 5. For example, the high-frequency power supply device 8 includes one inverter circuit or oscillation circuit, and the oscillation frequency thereof. It is possible to adopt an appropriate circuit configuration such as a configuration in which high-frequency currents of two types of frequencies are generated by switching the characteristic values of the electrical components that determine the above.

前記加熱コイル５は、図３及び図４に示すように、コイル部５ａと、このコイル部５ａに連結固定されたホルダー５ｂ等を有している。前記コイル部５ａは、所定板厚の銅板をロウ付け固定することにより、厚さ（例えば８ｍｍ）を有する平面視で略円環形状に形成され、その中心位置に上下方向に貫通し、焼入れ焼鈍しするワークＷの軸部の外形に対応した内径のワーク挿通孔１６が形成されている。また、コイル部５ａのワーク挿通孔１６の下端縁、すなわちコイル部５ａの下面（もしくは上面）でワーク挿通孔１６の周囲には、下方（もしくは上方）に所定寸法（例えば２ｍｍ）突出した略円環状の凸条１７（図４参照）が形成されている。   As shown in FIGS. 3 and 4, the heating coil 5 includes a coil portion 5a and a holder 5b connected and fixed to the coil portion 5a. The coil portion 5a is formed in a substantially annular shape in plan view having a thickness (for example, 8 mm) by brazing and fixing a copper plate having a predetermined thickness, and penetrates in the vertical direction at the center position, and is quenched and annealed. A workpiece insertion hole 16 having an inner diameter corresponding to the outer shape of the shaft portion of the workpiece W is formed. In addition, the lower end edge of the workpiece insertion hole 16 of the coil portion 5a, that is, the lower surface (or the upper surface) of the coil portion 5a, the periphery of the workpiece insertion hole 16 is a substantially circular shape protruding downward (or upward) by a predetermined dimension (for example, 2 mm) An annular ridge 17 (see FIG. 4) is formed.

さらに、コイル部５ａの内部には、円環状の冷却水流路１８が形成され、この冷却水流路１８に連通する状態で、コイル部５ｂの下面（もしくは上面）で凸条１７の外側に複数の冷却水噴射孔１９が凸条１７方向に角度３０度程度で指向し、かつコイル部５ａの下面（もしくは上面）に円周方向に一定間隔で形成されている。この冷却水流路１８と冷却水噴射孔１９とにより、加熱コイル５のコイル部５ａが冷却ジャケットとしても機能するようになっている。そして、加熱コイル５のコイル部５ａは、その円周方向の両端部が所定のスリット２０を有して対向し、この一対の端部が前記ホルダー５ｂの先端にそれぞれロウ付け固着されることにより、コイル部５ａがホルダー５ｂで支持された状態となっている。   Further, an annular cooling water flow path 18 is formed inside the coil portion 5a, and a plurality of outer sides of the ridges 17 are formed on the lower surface (or upper surface) of the coil portion 5b in a state of communicating with the cooling water flow path 18. The cooling water injection holes 19 are oriented in the direction of the ridges 17 at an angle of about 30 degrees, and are formed at regular intervals in the circumferential direction on the lower surface (or upper surface) of the coil portion 5a. The cooling water channel 18 and the cooling water injection hole 19 allow the coil portion 5a of the heating coil 5 to function as a cooling jacket. And the coil part 5a of the heating coil 5 has both ends in the circumferential direction facing each other with a predetermined slit 20, and the pair of end parts are brazed and fixed to the tip of the holder 5b, respectively. The coil portion 5a is supported by the holder 5b.

前記ホルダー５ｂは、一対の銅板２１を絶縁板２２を介して絶縁ブッシュ付のボルト２３で固定することにより側面視略短冊状の板状に形成され、その先端側の上部が切欠きされることにより側面視略三角形状に形成されている。また、ホルダー５ｂの後端部には、前記銅板２１より板厚な銅板からなる端子板２４が外側に直角状態でロウ付け固着されている。さらに、前記一対の銅板２１の外面には、その長手方向に沿って銅のパイプ２５がそれぞれロウ付け固着され、この各パイプ２５の先端に前記コイル部５ａの両端部が連結固定されている。   The holder 5b is formed in a substantially strip-like plate shape when viewed from the side by fixing a pair of copper plates 21 with an insulating bushing bolt 23 via an insulating plate 22, and an upper portion on the tip side thereof is notched. Is formed in a substantially triangular shape in side view. A terminal plate 24 made of a copper plate thicker than the copper plate 21 is brazed and fixed to the rear end of the holder 5b at a right angle to the outside. Further, copper pipes 25 are brazed and fixed to the outer surfaces of the pair of copper plates 21 along the longitudinal direction thereof, and both ends of the coil portion 5a are connected and fixed to the ends of the pipes 25.

また、各パイプ２５の後端は、前記端子板２４の表面にロウ付け固着され、端子板２４内に設けた図示しない冷却水流路の一端に連通し、該冷却水流路の他端は端子板２５の上面に開口し、この開口部分に銅の丸パイプの一端がロウ付け固着されている。そして、丸パイプの他端にホースコネクタ２６がロウ付け固着されている。これら一対のパイプ２５、端子板２４の冷却水流路、丸パイプ及びホースコネクタ２６によりホルダー５ｂに冷却水の循環路が形成されている。   The rear end of each pipe 25 is brazed to the surface of the terminal plate 24 and communicates with one end of a cooling water passage (not shown) provided in the terminal plate 24. The other end of the cooling water passage is the terminal plate. An opening is formed on the upper surface of 25, and one end of a copper round pipe is fixed to the opening by brazing. The hose connector 26 is fixed to the other end of the round pipe by brazing. A cooling water circulation path is formed in the holder 5 b by the pair of pipes 25, the cooling water flow path of the terminal plate 24, the round pipe and the hose connector 26.

このように構成された加熱コイル５は、端子板２４が高周波電源装置８に電気的に接続され、該電源装置８が作動することにより、所定周波数の高周波電流が、端子板２４及び銅板２１を介してコイル部５ａに供給される。また、前記冷却水供給装置７から、冷却水が図示しない一対のホースを介して、ホースコネクタ２６、丸パイプ、端子板２４の冷却水流路、パイプ２５を介してコイル部５ａの冷却水流路１８内に循環供給され、この冷却水が、冷却水噴射孔１９から噴射されるようになっている。   In the heating coil 5 configured as described above, the terminal plate 24 is electrically connected to the high frequency power supply device 8, and when the power supply device 8 is operated, a high frequency current of a predetermined frequency is applied to the terminal plate 24 and the copper plate 21. Via the coil portion 5a. Further, the cooling water from the cooling water supply device 7 passes through a pair of hoses (not shown), the hose connector 26, the round pipe, the cooling water flow path of the terminal plate 24, and the cooling water flow path 18 of the coil portion 5a via the pipe 25. The cooling water is circulated and supplied from the cooling water injection hole 19.

さらに、加熱コイル５は、端子板２４が、図示しないスライダー、ガイド及びモータ等を有する前記コイル移動装置６のスライダーに固定されており、これにより、制御装置９の制御信号でモータが回転してスライダーがガイドに沿って上下動、すなわち加熱コイル５がワークＷの外周側の所定範囲（焼入れ焼鈍し部位Ｗａの範囲）内を上下動するようになっている。   Further, the heating coil 5 has a terminal plate 24 fixed to the slider of the coil moving device 6 having a slider, a guide, a motor, etc. (not shown), whereby the motor is rotated by the control signal of the control device 9. The slider moves up and down along the guide, that is, the heating coil 5 moves up and down within a predetermined range (the range of the quenched and annealed portion Wa) on the outer peripheral side of the workpiece W.

次に、前記高周波誘導加熱装置１を使用したワークＷの焼入れ焼鈍し作業の一例を図５の工程図に基づいて説明する。なお、以下の説明では、高周波電源装置８が図２（ａ）に示す如く構成されているものとする。先ず、前記ワークＷは、図１及び図４に示すように、所定外径で所定長さの軸部と、この軸部の端部等の所定位置に例えば一体形成され軸部より径大な鍔部を有している。また、図１に示すように、軸部の焼入れ焼鈍し部位Ｗａの上下に対応した位置に、前記センサ１０ａ、１０ｂが配置されている。   Next, an example of the work of quenching and annealing the workpiece W using the high frequency induction heating apparatus 1 will be described based on the process diagram of FIG. In the following description, it is assumed that the high frequency power supply device 8 is configured as shown in FIG. First, as shown in FIGS. 1 and 4, the workpiece W is, for example, integrally formed at a predetermined position such as a shaft portion having a predetermined outer diameter and a predetermined length and an end portion of the shaft portion, and having a larger diameter than the shaft portion. Has a buttocks. Further, as shown in FIG. 1, the sensors 10a and 10b are disposed at positions corresponding to the upper and lower portions of the quenching and annealing portion Wa of the shaft portion.

そして、加熱コイル５を下限位置である初期位置にセット（Ｋ０１）し、この加熱コイル５のコイル部５ａのワーク挿通孔１６に、ワークＷを上方から挿入してその下部を下支持部材３で支持すると共に、ワークＷの上部を上支持部材２で支持し、この状態で制御装置９の制御信号によりクランプ装置４を作動させてワークＷをクランプ（Ｋ０２）する。ワークＷがクランプされたら、制御装置９の制御信号で高周波電源装置５の切替器１２を焼入れ側である第１インバータ１１ａ側に切替え（Ｋ０３）て、第１インバータ１１ａ、切替器１２を介して加熱コイル５に高周波電流を供給して、焼入れ作業を開始（Ｋ０４）する。   Then, the heating coil 5 is set to the initial position which is the lower limit position (K01), the workpiece W is inserted into the workpiece insertion hole 16 of the coil portion 5a of the heating coil 5 from above, and the lower portion thereof is covered by the lower support member 3. While supporting, the upper part of the workpiece | work W is supported by the upper support member 2, and the clamp apparatus 4 is operated with the control signal of the control apparatus 9 in this state, and the workpiece | work W is clamped (K02). When the workpiece W is clamped, the switching device 12 of the high-frequency power supply device 5 is switched to the quenching side of the first inverter 11a by the control signal of the control device 9 (K03), and the first inverter 11a and the switching device 12 are used. A high frequency current is supplied to the heating coil 5 to start the quenching operation (K04).

このとき、焼入れに使用される高周波電流は、その周波数が例えば１００〜２００ＫＨｚに設定され、焼入れ作業は、高周波電源装置８を作動させて高周波電流により焼入れ焼鈍し部位Ｗａを所定温度まで誘導加熱しつつ、冷却水供給装置７を作動させてコイル部５ａに設けた冷却水噴射孔１９から冷却水を加熱部位に噴射して急速冷却することにより行われる。また、この焼入れ作業は、コイル移動装置６の作動で加熱コイル５をワークＷの焼入れ焼鈍し部位Ｗａの下部から上部に向けて上昇移動させることによって略連続的に行われる。   At this time, the frequency of the high-frequency current used for quenching is set to, for example, 100 to 200 KHz, and the quenching operation is performed by induction-heating the portion Wa by quenching and annealing with the high-frequency current by operating the high-frequency power supply device 8. On the other hand, the cooling water supply device 7 is operated, and cooling water is sprayed from the cooling water injection holes 19 provided in the coil portion 5a to the heating portion to be rapidly cooled. Further, this quenching operation is performed substantially continuously by operating the coil moving device 6 to cause the heating coil 5 to quench and anneal the workpiece W and to move upward from the lower portion to the upper portion of the portion Wa.

そして、加熱コイル５が上昇して上限位置に達しこれをセンサ１０ａが検知すると、制御装置９の制御信号により加熱コイル５が停止（Ｋ０５）し、これにより焼入れ作業が終了（Ｋ０６）する。焼入れ作業が終了したら、制御装置９の制御信号によりコイル移動装置６が作動して、加熱コイル５が初期位置まで下降し、これがセンサ１０ｂで検知されて該位置に停止（Ｋ０７）する。この状態で、制御装置９の制御信号により、高周波電源装置８の切替器１２を焼鈍し側である第２インバータ１１ｂ側に切り替え（Ｋ０８）て、焼鈍し作業を開始（Ｋ０９）する。   When the heating coil 5 rises and reaches the upper limit position and is detected by the sensor 10a, the heating coil 5 is stopped (K05) by the control signal of the control device 9, and the quenching operation is completed (K06). When the quenching operation is completed, the coil moving device 6 is actuated by the control signal of the control device 9, and the heating coil 5 is lowered to the initial position, which is detected by the sensor 10b and stopped at the position (K07). In this state, the switching device 12 of the high-frequency power supply device 8 is switched to the second inverter 11b side which is the annealing side (K08) by the control signal of the control device 9, and the annealing work is started (K09).

この焼鈍しに使用される高周波電流は、その周波数が焼入れより低い例えば３０ＫＨｚ程度に設定され、この焼鈍し作業は、高周波電源装置８を作動させて高周波電流により焼入れ焼鈍し部位Ｗａを所定温度まで誘導加熱することで行われる。また、コイル移動装置６の作動で加熱コイル５をワークＷの焼入れ焼鈍し部位Ｗａの下部から上部に向けて上昇移動させることによって略連続的に行われる。この焼鈍し作業時においては、当然ながら冷却水による冷却はなく、冷却水供給装置７は非作動となっている。   The high-frequency current used for this annealing is set to, for example, about 30 KHz, the frequency of which is lower than that of quenching. In this annealing operation, the high-frequency power supply device 8 is operated to quench and anneal the part Wa to a predetermined temperature. This is done by induction heating. Further, the heating coil 5 is quenched and annealed by the operation of the coil moving device 6 and moved upwardly from the lower part to the upper part of the part Wa to be performed substantially continuously. During this annealing operation, naturally, there is no cooling by the cooling water, and the cooling water supply device 7 is inactive.

そして、加熱コイル５が再び上昇して上限位置に達しこれをセンサ１０ａが検知すると、制御装置９の制御信号により加熱コイル５が停止（Ｋ１０）し、これにより焼鈍し作業が終了（Ｋ１１）する。焼鈍し作業が終了したら、制御装置９の制御信号によりコイル移動装置６が作動して、加熱コイル６が初期位置まで下降し、これがセンサ１０ｂで検知されて該位置に停止（Ｋ１２）する。この状態で、制御装置９の制御信号により、クランプ装置４を作動させてワークＷをアンクランプ（Ｋ１３）し、上下支持部材２、３からワークＷを取り出すことにより、ワークＷの焼入れ焼鈍し作業が完了する。つまり、ワークＷの焼入れと焼鈍し作業が、１台の高周波誘導加熱装置１を使用し一つの作業サイクル内で略連続した状態で行われることになる。   When the heating coil 5 rises again and reaches the upper limit position and is detected by the sensor 10a, the heating coil 5 is stopped (K10) by the control signal of the control device 9, thereby annealing and finishing the work (K11). . When the annealing work is completed, the coil moving device 6 is actuated by the control signal of the control device 9, and the heating coil 6 is lowered to the initial position, which is detected by the sensor 10b and stops at the position (K12). In this state, the clamping device 4 is operated by the control signal of the control device 9 to unclamp the workpiece W (K13), and the workpiece W is taken out from the upper and lower support members 2 and 3 to quench and anneal the workpiece W. Is completed. That is, the work W and the work for annealing are performed in a substantially continuous state in one work cycle using one high-frequency induction heating apparatus 1.

なお、以上の焼入れ焼鈍し作業においては、焼鈍し作業時に加熱コイル５を下降させて初期位置に設定した状態で、すなわち焼入れと焼鈍しを加熱コイル５の上昇動作によって行ったが、例えば、前記工程Ｋ０７を省略し、焼鈍し作業を加熱コイル５の上限位置から開始させ、加熱コイル５が下降・停止（Ｋ１０’）した時点で終了させるようにしても良い。   In the above quenching and annealing operation, the heating coil 5 was lowered during the annealing operation and set to the initial position, that is, quenching and annealing were performed by the raising operation of the heating coil 5, for example, The step K07 may be omitted, and the annealing operation may be started from the upper limit position of the heating coil 5, and may be terminated when the heating coil 5 is lowered and stopped (K10 ′).

このように、前記高周波誘導加熱装置１によれば、高周波電源装置８が焼入れ用の第１インバータ１１ａと焼鈍し用の第２インバータ１１ｂを有し、制御装置９が第１インバータ１１ａと冷却水供給装置７を制御してワークＷを焼入れすると共に、該焼入れに略連続状態で第２インバータ１１ｂを制御して焼入れ部分を焼鈍しするため、ワークＷの焼入れと焼鈍しを１台の加熱装置１で略連続した一つの作業サイクル内で行うことができ、焼入れ焼鈍し作業の能率向上を図ることができる。また、焼入れ終了と焼入れ開始までの時間を極力短くすることができるため、焼鈍し開始前における焼入れ部位の品質低下等を抑制できて、ワークＷの焼入れ焼鈍し部位Ｗａに良好な焼入れ焼鈍し品質を容易に得ることができる。   Thus, according to the said high frequency induction heating apparatus 1, the high frequency power supply device 8 has the 1st inverter 11a for hardening, and the 2nd inverter 11b for annealing, and the control apparatus 9 has the 1st inverter 11a and the cooling water. In order to quench the workpiece W by controlling the supply device 7 and quenching the workpiece W by controlling the second inverter 11b in a state substantially continuous with the quenching, the heating and quenching of the workpiece W are performed by one heating device. 1 can be performed within one work cycle substantially continuous, and the efficiency of the quenching and annealing work can be improved. Moreover, since the time between the end of quenching and the start of quenching can be shortened as much as possible, it is possible to suppress the deterioration of the quality of the quenching part before the start of annealing, and the good quenching and annealing quality for the quenching and annealing part Wa of the workpiece W Can be easily obtained.

また、加熱コイル５が焼入れ焼鈍し部位Ｗａに沿って移動可能に配設されると共に、この加熱コイル５のコイル部５ａに冷却水流路１８と冷却水噴射孔１９が一体的に設けられているため、例えば棒状のワークＷであっても、所定長さの焼入れ焼鈍し部位Ｗａに沿って加熱コイル５が移動しながら行うことができて、焼入れ焼鈍し作業の能率を一層向上させることができる。   Further, the heating coil 5 is disposed so as to be movable along the quenching and annealing portion Wa, and the cooling water flow path 18 and the cooling water injection hole 19 are integrally provided in the coil portion 5a of the heating coil 5. Therefore, for example, even the rod-shaped workpiece W can be performed while the heating coil 5 moves along the quenching and annealing portion Wa of a predetermined length, and the efficiency of the quenching and annealing work can be further improved. .

さらに、高周波電源装置８が第１インバータ１１ａ及び第２インバータ１１ｂと切替器１２等を有し、制御装置９による切替器１２の制御により、第１インバータ１１ａもしくは第２インバータ１１ｂから加熱コイル５に所定周波数の高周波電流を供給するように構成すれば、焼入れ用の高周波電流と焼鈍し用の高周波電流を加熱コイル５に確実に供給することができる。また、高周波電源装置８がインバータ回路１３と第１発振回路１４ａと第２発振回路１４ｂ及び切替器１５を有し、制御手段９の制御により第１発振回路１４ａもしくは第２発振回路１４ｂを作動させて、インバータ回路１３から加熱コイル５に所定周波数の高周波電流を供給するように構成すれば、高周波電源装置８のインバータ回路の数を減らしたり切替器１５の構成等を簡素化できて、該電源装置８を安価に形成することができる。   Further, the high-frequency power supply device 8 includes a first inverter 11a, a second inverter 11b, a switcher 12 and the like, and the control device 9 controls the switcher 12 to change the heating coil 5 from the first inverter 11a or the second inverter 11b. When configured to supply a high-frequency current having a predetermined frequency, the high-frequency current for quenching and the high-frequency current for annealing can be reliably supplied to the heating coil 5. The high-frequency power supply device 8 includes an inverter circuit 13, a first oscillation circuit 14a, a second oscillation circuit 14b, and a switch 15. The control circuit 9 controls the first oscillation circuit 14a or the second oscillation circuit 14b. Thus, if the inverter circuit 13 is configured to supply a high-frequency current having a predetermined frequency to the heating coil 5, the number of inverter circuits of the high-frequency power supply device 8 can be reduced, the configuration of the switch 15 can be simplified, and the power supply The device 8 can be formed at low cost.

また、前記加熱コイル５によれば、コイル部５ａのワーク挿通孔１６の下端縁（もしくは上端縁）に該コイル部５ａの下面側に突出する円環状の凸条１７が形成されると共に、該凸条１７の外側にコイル部５ａ内の冷却水をワークＷの焼入れ部位に噴射可能な冷却水噴射孔１９が設けられているため、凸条１７をワークＷの軸部端面のギリギリまで近づけることができ、ワークＷの焼入れ境界部位を効果的に焼入れできると共に凸条１７で冷却水の飛散を抑制することができて、ワークＷに高品質な焼入れ状態を安定して得ることが可能となる。   Further, according to the heating coil 5, the annular ridge 17 projecting to the lower surface side of the coil portion 5a is formed at the lower end edge (or the upper end edge) of the work insertion hole 16 of the coil portion 5a, and the Since the cooling water injection hole 19 capable of injecting the cooling water in the coil portion 5a to the quenching part of the work W is provided outside the protrusion 17, the protrusion 17 is brought close to the end of the shaft end face of the work W. The quenching boundary portion of the workpiece W can be effectively quenched, and the splashing of the cooling water can be suppressed by the ridges 17, so that a high-quality quenching state can be stably obtained in the workpiece W. .

なお、前記実施形態においては、加熱コイル５をワークＷの焼入れ焼鈍し部位Ｗａに沿って上下方向に移動させつつ行ったが、本発明はこの構成に限定されず、ワークＷの焼入れ焼鈍し部位Ｗａの長さ等によっては、該部位Ｗａに対応した形状の加熱コイルを所定位置に固定的に配置し、この加熱コイルによって焼入れと焼鈍しを１サイクル内で略連続した状態で行うこともできる。   In addition, in the said embodiment, although the heating coil 5 performed quenching annealing of the workpiece | work W, moving up and down along the site | part Wa, this invention is not limited to this structure, The quenching annealing site | part of the workpiece | work W Depending on the length of Wa or the like, a heating coil having a shape corresponding to the part Wa can be fixedly arranged at a predetermined position, and quenching and annealing can be performed in a substantially continuous state within one cycle. .

また、前記実施形態においては、加熱コイル５のコイル部５ａに冷却ジャケットとして機能する冷却水流路１８や冷却水噴射孔１９を一体的に設けた例について説明したが、例えばコイル部の上下面や内外周面に冷却水流路と冷却水噴射孔を有する適宜形状の冷却ジャケットを、コイル部の上下面や内外周面に固着したりあるいは所定間隔を有して配置しても良い。さらに、前記実施形態における、加熱コイル５のコイル部５ａやホルダー５ｂの形状、制御装置９の構成等は一例であって、本発明の各発明に係わる要旨を逸脱しない範囲において適宜の構成を採用することができる。   Moreover, in the said embodiment, although the example which provided integrally the cooling water flow path 18 and the cooling water injection hole 19 which function as a cooling jacket in the coil part 5a of the heating coil 5 was demonstrated, for example, the upper and lower surfaces of a coil part, An appropriately shaped cooling jacket having cooling water passages and cooling water injection holes on the inner and outer peripheral surfaces may be fixed to the upper and lower surfaces and inner and outer peripheral surfaces of the coil portion or arranged with a predetermined interval. Furthermore, the shape of the coil portion 5a and the holder 5b of the heating coil 5 and the configuration of the control device 9 in the above embodiment are merely examples, and appropriate configurations are employed without departing from the spirit of the inventions of the present invention. can do.

本発明は、タービン軸等のワークに限定されず、焼入れと焼鈍しが必要な全てのワークに利用できる。   The present invention is not limited to a workpiece such as a turbine shaft, and can be used for all workpieces that require quenching and annealing.

１・・・高周波誘導加熱装置、２・・・上支持部材、３・・・下支持部材、４・・・クランプ装置、５・・・加熱コイル、５ａ・・・コイル部、５ｂ・・・ホルダー、６・・・コイル移動装置、７・・・冷却水供給装置、８・・・高周波電源装置、９・・・制御装置、１０ａ、１０ｂ・・・センサ、１１ａ・・・第１インバータ、１１ｂ・・・第２インバータ、１２、１５・・・切替器、１３・・・インバータ回路、１４ａ・・・第１発振回路、１４ｂ・・・第２発振回路、１６・・・ワーク挿通孔、１７・・・凸条、１８・・・冷却水流路、１９・・・冷却水噴射孔、Ｗ・・・ワーク、Ｗａ・・・焼入れ焼鈍し部位。   DESCRIPTION OF SYMBOLS 1 ... High frequency induction heating apparatus, 2 ... Upper support member, 3 ... Lower support member, 4 ... Clamp apparatus, 5 ... Heating coil, 5a ... Coil part, 5b ... Holder, 6 ... Coil moving device, 7 ... Cooling water supply device, 8 ... High frequency power supply device, 9 ... Control device, 10a, 10b ... Sensor, 11a ... First inverter, 11b ... second inverter, 12, 15 ... switch, 13 ... inverter circuit, 14a ... first oscillation circuit, 14b ... second oscillation circuit, 16 ... work insertion hole, 17 ... ridge, 18 ... cooling water flow path, 19 ... cooling water injection hole, W ... work, Wa ... quenching annealing part.

Claims (4)

支持手段で支持されたワークの焼入れ焼鈍し部位に配置された加熱コイルと、該加熱コイルに所定周波数の高周波電流を供給する高周波電源装置と、前記ワークを冷却可能な冷却手段と、これらを制御する制御手段と、を備え、
前記高周波電源装置は、焼入れ用の高周波電流を前記加熱コイルに供給可能な第１電源手段と、焼鈍し用の高周波電流を前記加熱コイルに供給可能な第２電源手段を有し、前記制御手段は、前記第１電源手段と冷却手段を制御してワークを焼入れすると共に、該焼入れに略連続状態で前記第２電源手段を制御してワークを焼鈍しすることを特徴とする高周波誘導加熱装置。 A heating coil arranged at a quenching and annealing portion of a work supported by a support means, a high-frequency power supply device that supplies a high-frequency current of a predetermined frequency to the heating coil, a cooling means that can cool the work, and controls these Control means for
The high frequency power supply device includes first power supply means capable of supplying a high frequency current for quenching to the heating coil, and second power supply means capable of supplying a high frequency current for annealing to the heating coil, and the control means Is a high frequency induction heating apparatus characterized in that the first power supply means and the cooling means are controlled to quench the workpiece and the workpiece is annealed by controlling the second power supply means in a state substantially continuous with the quenching. . 前記加熱コイルは、ワークの焼入れ焼鈍し部位に沿って移動可能に配設されると共に、焼入れ時にワークに冷却水を噴射可能な冷却ジャケットを有することを特徴とする請求項１に記載の高周波誘導加熱装置。   The high frequency induction according to claim 1, wherein the heating coil is disposed so as to be movable along a quenching and annealing portion of the workpiece and has a cooling jacket capable of injecting cooling water onto the workpiece at the time of quenching. Heating device. 前記高周波電源装置は、前記第１電源手段としての第１インバータ及び第２電源手段としての第２インバータと、これらに接続された切替器を有し、該切替器が前記制御手段で制御されることにより、加熱コイルに第１インバータと第２インバータのいずれから高周波電流が供給されることを特徴とする請求項１または２に記載の高周波誘導加熱装置。   The high-frequency power supply device includes a first inverter as the first power supply means, a second inverter as the second power supply means, and a switch connected to the first inverter, and the switch is controlled by the control means. Accordingly, the high-frequency induction heating apparatus according to claim 1 or 2, wherein the heating coil is supplied with a high-frequency current from either the first inverter or the second inverter. 前記高周波電源装置は、前記第１電源手段がインバータ回路と第１発振回路で形成され、前記第２電源手段が前記インバータ回路と第２発振回路とで形成され、前記制御手段の制御で第１発振回路と第２発振回路のいずれかを作動させることにより、インバータ回路から所定周波数の高周波電流が前記加熱コイルに供給されることを特徴とする請求項１または２に記載の高周波誘導加熱装置。   In the high-frequency power supply device, the first power supply means is formed of an inverter circuit and a first oscillation circuit, the second power supply means is formed of the inverter circuit and a second oscillation circuit, and the first is controlled by the control means. 3. The high frequency induction heating apparatus according to claim 1, wherein a high frequency current having a predetermined frequency is supplied from the inverter circuit to the heating coil by operating one of the oscillation circuit and the second oscillation circuit.
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