JPS6310877B2 - - Google Patents
Info
- Publication number
- JPS6310877B2 JPS6310877B2 JP9978283A JP9978283A JPS6310877B2 JP S6310877 B2 JPS6310877 B2 JP S6310877B2 JP 9978283 A JP9978283 A JP 9978283A JP 9978283 A JP9978283 A JP 9978283A JP S6310877 B2 JPS6310877 B2 JP S6310877B2
- Authority
- JP
- Japan
- Prior art keywords
- ambient temperature
- induction heating
- output
- output voltage
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- General Induction Heating (AREA)
Description
【発明の詳細な説明】
この発明は誘導加熱装置に関し、被加熱材が周
囲の温度に影響されず、一定温度で加熱されるよ
うにしたものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an induction heating device that heats a material to be heated at a constant temperature without being affected by the surrounding temperature.
最近の鍛造用誘導加熱装置は、温間鍛造用のも
のが増加している。これは、温間鍛造が熱間鍛造
に比較して、精密鍛造が可能なこと、省エネルギ
ー効果が大きいこと、製品の歩留りが向上するこ
と等に起因するものである。 Recent induction heating devices for forging are increasingly used for warm forging. This is due to the fact that warm forging allows for precision forging, has a greater energy saving effect, and improves the yield of products compared to hot forging.
ところで、温間鍛造では、その温度が周囲の温
度の影響を受けやすい。この影響は、被加熱材を
100℃前後から200℃程度に加熱する場合に著し
く、周囲温度差の大きい夏場と冬場とではこの影
響を無視することができない。 By the way, in warm forging, the temperature is easily influenced by the surrounding temperature. This effect causes the material to be heated to
This effect is noticeable when heating from around 100°C to around 200°C, and cannot be ignored in summer and winter when there is a large difference in ambient temperature.
従来、周囲温度に影響されず、被加熱材を一定
温度で加熱する誘導加熱装置として、高周波電源
から誘導加熱コイルに供給される電圧を出力電圧
設定器により手動調整するものが知られている。
しかしながらこのものでは、手動による調整のた
め、温度を一定にするための電圧設定が困難であ
り、信頼性が低いという欠点があつた。 BACKGROUND ART Conventionally, as an induction heating device that heats a material to be heated at a constant temperature without being affected by ambient temperature, one is known that manually adjusts the voltage supplied from a high frequency power source to an induction heating coil using an output voltage setting device.
However, this method had drawbacks such as manual adjustment, which made it difficult to set the voltage to keep the temperature constant, and the reliability was low.
この発明は上記した従来の欠点を除去し、周囲
温度が変化しても、これに応じて高周波電源から
誘導加熱コイルへ供給される電圧が自動的に制御
され、これにより被加熱材の加熱温度が周囲の温
度に影響されず、一定となるようにした誘導加熱
装置を提供するものである。 This invention eliminates the above-mentioned conventional drawbacks, and even if the ambient temperature changes, the voltage supplied from the high-frequency power source to the induction heating coil is automatically controlled in accordance with this, thereby increasing the heating temperature of the material to be heated. To provide an induction heating device which is not affected by the surrounding temperature and is kept constant.
以下、この発明の一実施例を図について説明す
る。図において、１は受電盤、２は変圧器、３は
インバータ、４はコンデンサ、５は誘導加熱コイ
ル、６は被加熱材、７は差動アンプ、８は変圧
器、９はθn演算器、１０は出力電圧設定器、１１
は周囲温度センサである。 An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a power receiving board, 2 is a transformer, 3 is an inverter, 4 is a capacitor, 5 is an induction heating coil, 6 is a heated material, 7 is a differential amplifier, 8 is a transformer, and 9 is a θ n calculator , 10 is an output voltage setting device, 11
is the ambient temperature sensor.
この誘導加熱装置の周囲温度θは周囲温度セン
サ１１で測定され、この周囲温度θはθn演算器９
に入力される。また、受電盤１からの商用電源は
変圧器２を経て、インバータ３に供給され、高周
波電流に変換される。このインバータ（高周波電
源）３からの高周波電流は誘導加熱コイル５に供
給され、これにより被加熱材６が加熱される。上
記インバータ３の出力電圧は差動アンプ７の出力
によつて制御され、該差動アンプには出力電圧設
定器１０からの設定電圧と変換器８を介した前記
θn演算器９からの電圧が入力される。 The ambient temperature θ of this induction heating device is measured by an ambient temperature sensor 11, and this ambient temperature θ is measured by a θ n calculator 9.
is input. Further, commercial power from the power receiving board 1 is supplied to an inverter 3 via a transformer 2, and is converted into a high frequency current. The high frequency current from this inverter (high frequency power supply) 3 is supplied to the induction heating coil 5, thereby heating the material to be heated 6. The output voltage of the inverter 3 is controlled by the output of the differential amplifier 7, which is supplied with the set voltage from the output voltage setter 10 and the voltage from the θ n calculator 9 via the converter 8. is input.
誘導加熱装置の周囲温度θは被加熱材６の温度
をθだけ持上げているので、見かけ上被加熱材６
をθだけ温度上昇させる電力Ｐを投入したことに
なり、従つて
周囲温度θ∝電力Ｐ∝出力電圧のｍ乗Em
……(1)
（一般には、ｍ＝２、ｎ＝1/2に近い）
が成立する。この比例式(1)から、
出力電圧Ｅ∝周囲温度θn ……(2)
が成立する。 The ambient temperature θ of the induction heating device raises the temperature of the heated material 6 by θ, so the apparent temperature of the heated material 6 increases by θ.
Therefore, the ambient temperature θ ∝ the power P ∝ the output voltage to the m power E m
...(1) (In general, m = 2, n = close to 1/2) holds true. From this proportional equation (1), the following holds true: Output voltage E ∝ Ambient temperature θ n ...(2).
前記したセンサ１１からの周囲温度θがθn演算
器９に入力されると、出力電圧Ｅに換算した基準
電圧V1が得られる。この基準電圧V1と、被加熱
材６の所望加熱温度から定まる出力電圧設定器１
０の出力電圧V2とを差動アンプ７に入力して該
アンプの出力をインバータ３の基準電圧V0とす
ることにより周囲温度θが変化しても所定の出力
電圧E0が得られ、結果として周囲温度θに無関
係に被加熱材６の加熱温度が一定に保持される。 When the ambient temperature θ from the sensor 11 described above is input to the θ n calculator 9, a reference voltage V 1 converted into an output voltage E is obtained. Output voltage setting device 1 determined from this reference voltage V 1 and the desired heating temperature of the heated material 6
By inputting the output voltage V 2 of 0 to the differential amplifier 7 and using the output of the amplifier as the reference voltage V 0 of the inverter 3, a predetermined output voltage E 0 can be obtained even if the ambient temperature θ changes. As a result, the heating temperature of the heated material 6 is kept constant regardless of the ambient temperature θ.
尚、変換器８はθn演算器９の出力と出力電圧設
定器１０の出力とのレベル合せを行うためのもの
である。 The converter 8 is used to level match the output of the θ n calculator 9 and the output of the output voltage setter 10.
また、前記した如く、一般的にはｎ＝1/2、つ
まり√ 関数が使えるので、安価な市販品を用い
て、本発明の効果を得ることができる。 Further, as described above, since n=1/2, that is, the √ function can be used in general, the effects of the present invention can be obtained using inexpensive commercially available products.
この発明は上記した如く、周囲温度に応じて誘
導加熱コイルへの高周波電源の印加電圧を制御
し、これにより周囲温度に関係なく被加熱材が一
定温度で自動的に加熱されるようにしたから、信
頼性の高い誘導加熱装置が得られる。 As described above, this invention controls the voltage applied to the induction heating coil from a high-frequency power source according to the ambient temperature, so that the material to be heated is automatically heated at a constant temperature regardless of the ambient temperature. , a highly reliable induction heating device can be obtained.
図はこの発明の一実施例を示すブロツク図であ
る。
３：インバータ、５：誘導加熱コイル、６：被
加熱材、７：差動アンプ、９：θn演算器、１０：
出力電圧設定器、１１：周囲温度測定センサ。
The figure is a block diagram showing one embodiment of the present invention. 3: Inverter, 5: Induction heating coil, 6: Heated material, 7: Differential amplifier, 9: θ n calculator, 10:
Output voltage setting device, 11: Ambient temperature measurement sensor.
Claims (1)
θをθnに変換するθn演算器と、該θn演算器の出力
信号及び高周波電源の出力電圧設定器の出力信号
が入力される差動アンプと、高周波電源からの出
力電流が供給され、被加熱材を加熱する誘導加熱
コイルとを備え、上記差動アンプの出力により上
記高周波電源の出力電圧を設定するようになし、
以つて被加熱材の加熱温度を周囲温度に影響され
ることなく一定に保持するようにしたことを特徴
とする誘導加熱装置。1. An ambient temperature measurement sensor, a θ n calculator that converts the signal θ from the sensor into θ n , and a differential sensor into which the output signal of the θ n calculator and the output signal of the output voltage setting device of the high frequency power supply are input. comprising an amplifier and an induction heating coil that is supplied with an output current from a high-frequency power source and heats a heated material, and the output voltage of the high-frequency power source is set by the output of the differential amplifier;
An induction heating device characterized in that the heating temperature of a heated material is maintained constant without being affected by ambient temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9978283A JPS59224093A (en) | 1983-06-02 | 1983-06-02 | Induction heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9978283A JPS59224093A (en) | 1983-06-02 | 1983-06-02 | Induction heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59224093A JPS59224093A (en) | 1984-12-15 |
| JPS6310877B2 true JPS6310877B2 (en) | 1988-03-09 |
Family
ID=14256505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9978283A Granted JPS59224093A (en) | 1983-06-02 | 1983-06-02 | Induction heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59224093A (en) |
-
1983
- 1983-06-02 JP JP9978283A patent/JPS59224093A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59224093A (en) | 1984-12-15 |
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