JPS6244976A - Vacuum induction furnace - Google Patents
Vacuum induction furnaceInfo
- Publication number
- JPS6244976A JPS6244976A JP18617985A JP18617985A JPS6244976A JP S6244976 A JPS6244976 A JP S6244976A JP 18617985 A JP18617985 A JP 18617985A JP 18617985 A JP18617985 A JP 18617985A JP S6244976 A JPS6244976 A JP S6244976A
- Authority
- JP
- Japan
- Prior art keywords
- power
- frequency
- heating coil
- furnace
- metal
- 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.)
- Granted
Links
Landscapes
- General Induction Heating (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 ［技術分野］ この発明は誘導加熱を使用１２に真空誘導炉に関ずろ。[Detailed description of the invention] [Technical field] This invention relates to a vacuum induction furnace using induction heating.
「従来技術及びその問題点］
真空誘導炉は炉内に材料をチャージ１刃こ後頁空槽を密
閉１７て真空排気し、真空中で溶解４−べき金属に誘導
加熱により通電１２て、この金属を溶解し、溶解完了後
、真空中で脱ガス操作が行なわＡする。"Prior art and its problems" In a vacuum induction furnace, material is charged into the furnace, the empty tank is sealed (17) and evacuated, and the molten metal is energized (12) by induction heating in a vacuum. The metal is melted, and after the melting is complete, a degassing operation is performed in a vacuum.
金属の溶解時は短時間で溶解完了するよう最大電力が投
入することが望まれろ。それに反し２脱ガス時には溶湯
を撹拌することによって溶湯中に食上れるガスを速やか
に外部に排気オろことに重点がおかれる。誘導溶解炉に
おいては一般的に投入電力を増すために高周波炉が使用
さＡ１ろ、炉には投入される電力Ｐは第２図のインピー
ダンス図にある■の線の如きインピーダンスをちって最
人電ノＪが入る様設計される。このとき炉に投入される
電力は０．９ Ｖｏ Ｉ ａｃｏｓγで表わされる。こ
こに係数０゜９は電力変換に伴う波形率でありｃｏｓγ
は制御遅２１ぴ１である。説明を簡単にするため以後、
炉に投入される電力はＶｉとＴｉとを結ぶ線（ｉ＝０．
ｌ、２）で囲まれる面積として考える。When melting metal, it is desirable to input maximum power so that the melting can be completed in a short time. On the other hand, during 2nd degassing, emphasis is placed on stirring the molten metal and quickly exhausting the gas that is absorbed into the molten metal to the outside. In induction melting furnaces, a high frequency furnace is generally used to increase the input power. It is designed to accommodate Denno J. The electric power input into the furnace at this time is expressed as 0.9 Vo I acosγ. Here, the coefficient 0°9 is the waveform rate associated with power conversion, and cosγ
is the control delay 21pi1. To simplify the explanation, hereafter,
The electric power input to the furnace is connected to a line connecting Vi and Ti (i=0.
l, 2).
従来はこの最大投入電力で速やかに溶解された後は脱ガ
スを４−ろために電圧をしぼりＶｌと（Ｉ）と１ｉとで
定よろ投入電力としていた。Conventionally, after melting was performed quickly with this maximum input power, the voltage was reduced to prevent degassing, and the voltage was reduced to a constant input power with Vl, (I), and 1i.
こイっけ脱ガス作業中らフルパワーをか（ｊておくと溶
湯濃度が１−昇Ｌ ｔぎ、耐火物を損傷１７、渇Ｃ）れ
！Ｉｆ故に発展づ−ろことを防くため、保持温度に保っ
た１ｊの電力を投入電ろためである。Use full power during the degassing work (If you leave it on, the molten metal concentration will rise by 1 - Lt, damaging the refractory 17, drying)! In order to prevent this from occurring, the power of 1j kept at the holding temperature is turned on.
脱カス作業は甲くて乙３０分以十、かかり、この時間γ
（ス縮が操業効率を１−げろために重要なポイントを占
めている。そのため脱力゛ス作業時間を短縮するために
溶湯中にガスバブリングをオろことを近年おこなわれて
いる。一方、誘導炉においては炉に電力をか（Ｉろこと
により炉内に湯運動と称さで表さイ］ろ如く周波数ｒの
平方に反比例１．炉入力Ｐに比例する。この湯運動を大
きくし撹拌力を強めろことも脱カス時間短縮に非常に効
果を表イっす。The scrap removal work takes about 30 minutes or more, and this time γ
(Gas reduction is an important point in increasing operational efficiency. Therefore, in recent years, gas bubbling in the molten metal has been carried out to shorten the de-stressing operation time. In a furnace, the electric power to the furnace (expressed as the movement of the hot water in the furnace) is inversely proportional to the square of the frequency r. Strengthening the slag is also very effective in shortening the removal time.
謁運動を大きく４−ろノニめに（Ｊ投入電力Ｐを太きく
４−ｔ＋ば゛よい訳であるか投入電力を入きくオろこと
け溶湯温度を高めろことになり、安全操業−１−１相反
する問題があっノニ。また一方、周波数を低くオろこと
ら考えらＡ１ろかごの場合には別電源を必要と４−ろご
とから高価な装置となる欠点を何１．てい）こ。It is better to increase the power input P to 4-t+, which means that the input power should be increased to increase the temperature of the molten metal, and safe operation -1. -1 There are conflicting problems.On the other hand, considering the low frequency, A1 cage requires a separate power supply. child.
［発明の［１的］
この発明（Ｊ上述の問題を解決するノニめになさイまた
ムのであって、簡ｑ１でかつ安価な装置で誘導炉に印加
される７１力を低減し、溶解金属の過熱を防止できる装
置を提供オろごとを目的と帽ろ。[Object 1 of the Invention] This invention (J) aims to solve the above-mentioned problems by reducing the 71 force applied to an induction furnace with a simple and inexpensive device, and The purpose is to provide a device that can prevent overheating of the engine.
［発明の構成］
この発明は出力電流と出力型Ｙ［とを所定の値に制限す
るリミッタを備えた電力変換手段を介して交流電力を誘
導加熱コイルに供給することにより金属を誘導加熱する
真空誘導炉において、電力変換手段の出力側に接続され
るコンデンサの容量を変えて誘導加熱コイルに供給する
周波数を変更−４゜る周波数変更手段と、金属の溶解さ
且ろ間は電力変換手段からフルパワーを出力し、溶解度
は周波数変更手段によって誘導加熱コイルに力旧つる周
波数を低下して、上記リミッタを作動させて誘導加熱コ
イルに加オ）ろ電力を低下するように電力制御４−ろ制
御手段とを備えたことを特徴とオろ。[Structure of the Invention] The present invention provides a vacuum system for inductively heating metal by supplying alternating current power to an induction heating coil through a power conversion means equipped with a limiter that limits the output current and the output type Y to a predetermined value. In an induction furnace, a frequency changing means for changing the frequency supplied to the induction heating coil by changing the capacity of a capacitor connected to the output side of the power converting means, and a frequency changing means for changing the frequency supplied to the induction heating coil by changing the capacity of a capacitor connected to the output side of the power converting means, and a frequency changing means that changes the frequency supplied to the induction heating coil by changing the capacity of a capacitor connected to the output side of the power converting means, and a frequency changing means that changes the frequency supplied to the induction heating coil by changing the capacity of a capacitor connected to the output side of the power converting means. Full power is output, solubility is applied to the induction heating coil by the frequency changing means, and the frequency is lowered, and the limiter is activated to reduce the filtration power applied to the induction heating coil. It is characterized by being equipped with a control means.
［実施例］ 以下にこの発明の一実施例を図面とともに説明する。[Example] An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１は真空誘導炉溶解炉、２（」誘導炉
溶解ｌの誘導加熱用のコイルである。３ｉＪザイリスタ
をスイッチング素子として、交流の電力変換を行うイン
バータである。このインバータの出力特性は第２図に示
すようにリミッタによって最大出力流Ｉ。、最大出力電
圧■。で制限されるように構成されている。In Fig. 1, 1 is a vacuum induction furnace melting furnace, 2 is a coil for induction heating of induction furnace melting l, and is an inverter that converts AC power using a 3iJ Zyristor as a switching element.The output of this inverter As shown in FIG. 2, the characteristics are configured to be limited by a limiter to a maximum output current I. and a maximum output voltage ■.
４はインバータ３の出力電圧と出力電流とを制御するイ
ンバータ制御装置である。4 is an inverter control device that controls the output voltage and output current of the inverter 3.
インバータ３の出力端子は誘導溶解炉１の加熱コイル２
に接続され、インバータ３から印加される所定周波数の
交流電力で駆動さイ１ろ。The output terminal of the inverter 3 is the heating coil 2 of the induction melting furnace 1.
1, and is driven by AC power of a predetermined frequency applied from the inverter 3.
インバータ３の出力線には電圧検出用の変成器５ど電流
検出用の変流器６が設（ｊられている。変成器５、変流
器６の６検出出力はインバータ制御・装置４に供給され
る。A transformer 5 for detecting voltage and a current transformer 6 for detecting current are installed on the output line of the inverter 3. The detected outputs of the transformer 5 and current transformer 6 are connected to the inverter control device 4. Supplied.
ざらにインバータ３の出力線には周波数調整用の＝Ｉン
デンザ７−１が接続され、さらにコンデンサ７−２ 、
７−３がスイッチ８，９を介して接続されている。スイ
ッチ８．９をインバータ制御装置４の出力信号によって
開閉することによりインバータの出力線に接続されるコ
ンデンサの容量を変化して、誘導加熱コイル２に印加さ
れる交流の周波数を変更できろようにしている。この発
明（」加熱コイル２に供給される交流の周波数の変化に
応して、加熱コイル２のインピーダンスも変化し、一方
インバータ３の出力電流をＩ。に制限することによって
、誘導溶解炉１への投入電力をち制御できるようにした
乙のである。Roughly, an =I indenzer 7-1 for frequency adjustment is connected to the output line of the inverter 3, and a capacitor 7-2,
7-3 are connected via switches 8 and 9. By opening and closing the switch 8.9 in accordance with the output signal of the inverter control device 4, the capacity of the capacitor connected to the output line of the inverter is changed, and the frequency of the alternating current applied to the induction heating coil 2 can be changed. ing. In accordance with the change in the frequency of the alternating current supplied to the heating coil 2, the impedance of the heating coil 2 also changes, and on the other hand, by limiting the output current of the inverter 3 to I. It is possible to control the input power of the device.
第１図の装置において、誘導溶解炉ｌに溶解すべき金属
を入れて、インバータ３から交流を供給して、誘導加熱
により炉内の金属を加熱し、溶解させろ。加熱、溶解中
は、スイッチ８．９をオフとしてインバータ３の出力線
に生じる周波数を高くしておき、加熱コイル２に供給さ
れる電圧をたとえば第２図のように高い電圧■３．と１
．て、加熱＝１イル２へ耐大電力を（Ｊ（給する。こイ
１により金属の加熱と溶解とか１１（＜行なわれろ。In the apparatus shown in FIG. 1, metal to be melted is placed in an induction melting furnace l, and alternating current is supplied from an inverter 3 to heat and melt the metal in the furnace by induction heating. During heating and melting, the switch 8.9 is turned off to increase the frequency generated in the output line of the inverter 3, and the voltage supplied to the heating coil 2 is set to a high voltage, for example, as shown in FIG. and 1
．． Then, supply a large amount of electric power (J) to the heating = 1 ile 2. Heating and melting of the metal is done by this 1.
−・方、金属の溶解後の脱ガスに際して（」インバータ
制御装置４の出力によって、スイッチ８，９をオンとし
７て、コンデンサ７−２．７−３を回路中に投入し、て
インバータの使用周波数を低くする。- On the other hand, when degassing after melting the metal, the switches 8 and 9 are turned on according to the output of the inverter control device 4, and the capacitors 7-2 and 7-3 are inserted into the circuit, and the inverter is turned on. Lower the frequency used.
これによって、加熱コイル２のインピーダンスけ■から
■へ変化し７、ｊＪ］１熱コイル２に印加される端子電
圧ら■２に低−トする。インバータ３の出力電流はＩ。As a result, the impedance of the heating coil 2 changes from 1 to 2, and the terminal voltage applied to the heating coil 2 decreases to 2. The output current of inverter 3 is I.
に制限されているので誘導溶解炉１に投入される電力も
第２図の■、−■−１ｏで囲まれる面積で表されるよう
に低下１７、溶解４″みの金属が過熱されることかない
。Since the electric power input to the induction melting furnace 1 is limited to It's fleeting.
［発明の効果］
以１−詳述したようにこの発明はインバータの出力に接
続さＡ１ろコンデンサの容］ＩＶを変えて、インバータ
の周波数を変えることに、ｊ、り負６ｎにかかる電力を
低減゛４゛ろようにしたものであり、極めて簡単な装置
で誘導炉に印加される電力を制御でき、安価な装置で炉
内の溶解金属の過熱を防止できる。[Effects of the Invention] As described in 1-1 below, this invention can reduce the power applied to j and negative 6n by changing the capacitance of the A1 filter capacitor connected to the output of the inverter and changing the frequency of the inverter. The electric power applied to the induction furnace can be controlled with an extremely simple device, and the molten metal in the furnace can be prevented from overheating with an inexpensive device.
第１図はこの発明の一実施例を示す回路図、第２図（」
第１図の実施例の動作を示すグラフである。
１・・真空誘導溶解炉、２・・加熱コイル、３・・・イ
ンバータ、４・・・インバータ制御装置、７−１．７−
２．７−３・・コンデンサ、８．９・・・スイッチ。Figure 1 is a circuit diagram showing an embodiment of the present invention, Figure 2 (
2 is a graph showing the operation of the embodiment of FIG. 1; 1... Vacuum induction melting furnace, 2... Heating coil, 3... Inverter, 4... Inverter control device, 7-1.7-
2.7-3...Capacitor, 8.9...Switch.
Claims (1)
ッタを備えた電力変換手段を介して交流電力を誘導加熱
コイルに供給することにより金属を誘導加熱する真空誘
導炉において、電力変換手段の出力側に接続されるコン
デンサの容量を変えて誘導加熱コイルに供給する周波数
を変更する周波数変更手段と、金属の溶解させる間は電
力変換手段からフルパワーを出力し、溶解後は周波数変
更手段によって誘導加熱コイルに加わる周波数を低下し
て、上記リミッタを作動させて誘導加熱コイルに加わる
電力を低下するように電力制御する制御手段とを備えた
ことを特徴とする真空誘導炉。(1) In a vacuum induction furnace that inductively heats metal by supplying AC power to an induction heating coil via a power conversion means equipped with a limiter that limits output current and output voltage to predetermined values, the power conversion means a frequency changing means that changes the frequency supplied to the induction heating coil by changing the capacity of a capacitor connected to the output side of the metal, and a frequency changing means that outputs full power from the power conversion means while melting the metal and after melting the metal. 1. A vacuum induction furnace comprising control means for controlling power so as to reduce the frequency applied to the induction heating coil by activating the limiter to reduce the power applied to the induction heating coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18617985A JPS6244976A (en) | 1985-08-23 | 1985-08-23 | Vacuum induction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18617985A JPS6244976A (en) | 1985-08-23 | 1985-08-23 | Vacuum induction furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6244976A true JPS6244976A (en) | 1987-02-26 |
| JPH0470756B2 JPH0470756B2 (en) | 1992-11-11 |
Family
ID=16183773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18617985A Granted JPS6244976A (en) | 1985-08-23 | 1985-08-23 | Vacuum induction furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6244976A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011258316A (en) * | 2010-06-04 | 2011-12-22 | Kitashiba Electric Co Ltd | Controller for induction smelting furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5578492A (en) * | 1978-12-08 | 1980-06-13 | Nippon Steel Corp | Method of setting inductive heating voltage of selffcontrolled inverter power supply |
| JPS58225593A (en) * | 1982-06-23 | 1983-12-27 | 富士電機株式会社 | Controller for billet heater |
-
1985
- 1985-08-23 JP JP18617985A patent/JPS6244976A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5578492A (en) * | 1978-12-08 | 1980-06-13 | Nippon Steel Corp | Method of setting inductive heating voltage of selffcontrolled inverter power supply |
| JPS58225593A (en) * | 1982-06-23 | 1983-12-27 | 富士電機株式会社 | Controller for billet heater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011258316A (en) * | 2010-06-04 | 2011-12-22 | Kitashiba Electric Co Ltd | Controller for induction smelting furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0470756B2 (en) | 1992-11-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |