JPH09170021A - Method for induction-heating blank to be heated - Google Patents
Method for induction-heating blank to be heatedInfo
- Publication number
- JPH09170021A JPH09170021A JP7330750A JP33075095A JPH09170021A JP H09170021 A JPH09170021 A JP H09170021A JP 7330750 A JP7330750 A JP 7330750A JP 33075095 A JP33075095 A JP 33075095A JP H09170021 A JPH09170021 A JP H09170021A
- Authority
- JP
- Japan
- Prior art keywords
- heated
- heating
- temperature
- induction
- frequency
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、被加熱素材の誘導
加熱方法に関する。さらに詳しくは、被加熱素材を誘導
加熱炉内で高温加熱し、さらに所定時間均熱保持する誘
導加熱方法に関する。TECHNICAL FIELD The present invention relates to an induction heating method for a material to be heated. More specifically, the present invention relates to an induction heating method in which a material to be heated is heated to a high temperature in an induction heating furnace, and is further uniformly heated for a predetermined time.
【０００２】[0002]
【従来の技術】従来、被加熱素材を誘導加熱炉内で誘導
加熱する際には、加熱段階で被加熱素材の中心温度を所
定の均熱温度に調整したのち、均熱段階で投入電力を前
記加熱段階での投入電力の半分以下に調整して被加熱素
材の中心温度を前記均熱温度とした状態で所定時間保持
する方法、加熱段階で被加熱素材の中心温度を所定の均
熱温度に調整したのち、均熱段階で投入電力を加熱段階
での投入電力の半分以下に調整し、かつ均熱段階で周波
数を加熱段階での周波数よりも高くし、被加熱素材の中
心温度を前記均熱温度に所定時間保持する方法などが採
用されている（特公平６−１０４８６７号公報）。2. Description of the Related Art Conventionally, when induction heating a material to be heated in an induction heating furnace, the center temperature of the material to be heated is adjusted to a predetermined soaking temperature in the heating step, and then the input power is supplied in the soaking step. A method of adjusting the center temperature of the material to be heated to half or less of the input power in the heating step and maintaining the center temperature of the material to be heated for a predetermined time, and the center temperature of the material to be heated in the heating step to a predetermined temperature Adjust the input power to less than half of the input power in the heating stage in the soaking stage, and make the frequency higher than the frequency in the heating stage in the soaking stage, and set the center temperature of the heated material to the above. A method of maintaining the soaking temperature for a predetermined time is adopted (Japanese Patent Publication No. 6-104867).
【０００３】しかしながら、前者の加熱方法には、被加
熱素材の中心温度を均熱温度に保持する際に、被加熱素
材の表面からの熱放散により、表層や端面の温度が低下
し、被加熱素材全体が均温にならなくなるというが問題
がある。However, in the former heating method, when the central temperature of the material to be heated is maintained at a soaking temperature, the temperature of the surface layer or the end surface is lowered due to the heat dissipation from the surface of the material to be heated, and The problem is that the entire material does not become soaked.
【０００４】また、後者の加熱方法には、均熱段階で周
波数を高めるので、表層や端面の加熱効果があるが、被
加熱素材の内部への入熱が不足し、また表層部が過加熱
されて高温になりすぎるという被加熱素材全体が均温に
ならなくなるという問題がある。The latter heating method has the effect of heating the surface layer and the end surface because the frequency is increased in the soaking step, but the heat input into the material to be heated is insufficient and the surface layer portion is overheated. There is a problem that the whole material to be heated is not heated so that the temperature becomes too high.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、前記従来技
術に鑑みてなされたものであり、被加熱素材全体を均温
に誘導加熱することができる方法を提供することを目的
とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and an object of the present invention is to provide a method capable of inductively heating the entire material to be heated so that the temperature is uniform.
【０００６】[0006]
【課題を解決するための手段】本発明は、被加熱素材を
誘導加熱炉内で高温加熱したのち、所定時間均熱保持す
る加熱方法であって、被加熱素材を誘導加熱炉内で昇温
させる加熱段階と、前記加熱段階よりも周波数を高く
し、かつ投入電力を下げて加熱する均熱段階とのあいだ
に、前記加熱段階での誘導加熱と同一の周波数で、かつ
前記加熱段階よりも投入電力を下げて誘導加熱する準加
熱段階を設けることを特徴とする被加熱素材の誘導加熱
方法に関する。The present invention is a heating method in which a material to be heated is heated in an induction heating furnace at a high temperature, and then is uniformly heated for a predetermined time. The material to be heated is heated in the induction heating furnace. Between the heating step and the heating step, the frequency of which is higher than that of the heating step, and the soaking step of heating by reducing the input power, at the same frequency as the induction heating in the heating step, and more than the heating step. The present invention relates to a method for induction heating a material to be heated, which comprises providing a quasi-heating step of lowering input power and performing induction heating.
【０００７】[0007]
【発明の実施の形態】本発明の被加熱素材の誘導加熱方
法は、前記したように、被加熱素材を誘導加熱炉内で昇
温させる加熱段階と、前記加熱段階よりも周波数を高く
し、かつ投入電力を下げて加熱する均熱段階とのあいだ
に、前記加熱段階での誘導加熱と同一の周波数で、かつ
前記加熱段階よりも投入電力を下げて誘導加熱する準加
熱段階を設けることを特徴とする。BEST MODE FOR CARRYING OUT THE INVENTION As described above, the induction heating method of the material to be heated of the present invention comprises a heating step of raising the temperature of the material to be heated in an induction heating furnace, and a frequency higher than the heating step, In addition, between the soaking step of lowering the input power and heating, a quasi-heating step of induction heating with the same frequency as the induction heating in the heating step and lowering the input power than the heating step is provided. Characterize.
【０００８】本発明の被加熱素材の誘導加熱方法におけ
る加熱段階、準加熱段階および均熱段階の各加熱段階で
の周波数、投入電力、ならびに被加熱素材の表面温度お
よび中心温度の関係を図１に示す。FIG. 1 shows the relationship between the frequency, the input power, the surface temperature and the center temperature of the material to be heated in each heating step of the heating step, the semi-heating step and the soaking step in the induction heating method of the material to be heated of the present invention. Shown in.
【０００９】図１に示されるように、加熱段階において
は、周波数ｆ0、投入電力Ｗ0に制御して被加熱素材をそ
の表面温度を監視し、該表面温度が所定の温度に達した
時点で加熱段階を終了する。As shown in FIG. 1, in the heating step, the surface temperature of the material to be heated is monitored by controlling the frequency f 0 and the input power W 0 , and when the surface temperature reaches a predetermined temperature. Finish the heating step with.
【００１０】前記周波数ｆ0は、効率的な加熱を行なう
ために必要な磁気的結合を確保する点から、５０Ｈｚ以
上、なかんづく１１０Ｈｚ以上であることが好ましく、
また電流浸透深さを大きくとり、被加熱素材のより内部
を加熱する点から、１５０Ｈｚ以下、なかんづく１３５
Ｈｚ以下であることが好ましい。The frequency f 0 is preferably 50 Hz or more, and more preferably 110 Hz or more, from the viewpoint of ensuring the magnetic coupling required for efficient heating.
In addition, since the current penetration depth is set large and the inside of the material to be heated is heated, it is less than 150 Hz.
Hz or less.
【００１１】つぎに、準加熱段階においては、周波数は
前記加熱段階と同様にｆ0とし、投入電力を前記加熱段
階よりも低下させて加熱する。このとき、被加熱素材の
表面温度を監視し、該表面温度が所定の温度に達したの
ち、一定となるように漸次、投入電力を低下させ、該被
加熱素材の中心温度と表面温度との温度偏差が所定の範
囲内に収まった時点ｔ2で準加熱段階を終了する。Next, in the semi-heating step, the frequency is set to f 0 as in the heating step, and the applied electric power is lowered below that in the heating step. At this time, the surface temperature of the material to be heated is monitored, and after the surface temperature reaches a predetermined temperature, the input power is gradually reduced so as to be constant, and the center temperature and the surface temperature of the material to be heated are reduced. The semi-heating step is ended at time t 2 when the temperature deviation falls within a predetermined range.
【００１２】前記被加熱素材の所定の表面温度は、該被
加熱素材の種類などによっても異なるが、通常、方向性
電磁鋼板では１３００〜１４００℃程度、チタン鋼板で
は７００〜８００℃程度である。Although the predetermined surface temperature of the material to be heated varies depending on the type of the material to be heated, it is usually about 1300 to 1400 ° C. for grain oriented electrical steel sheets and about 700 to 800 ° C. for titanium steel sheets.
【００１３】前記被加熱素材の中心温度と表面温度との
温度偏差は、被加熱素材の最終製品段階での品質のバラ
ツキの低減の点から、２０℃以下であることが好まし
い。The temperature deviation between the center temperature and the surface temperature of the material to be heated is preferably 20 ° C. or less from the viewpoint of reducing the variation in the quality of the material to be heated in the final product stage.
【００１４】該準加熱段階が終了した時点ｔ2における
投入電力Ｗ1は、初期の投入電力Ｗ0の５０％以下である
ことが中心部を過加熱せずに表層部の温度を高める点で
好ましい。The input power W 1 at the time t 2 at which the semi-heating step is completed is 50% or less of the initial input power W 0 in that the temperature of the surface layer portion is raised without overheating the central portion. preferable.
【００１５】前記準加熱段階および均熱段階の加熱時間
は、被加熱素材の種類などによって異なるので一概には
決定することができないが、両段階の合計加熱時間は、
通常１０〜４０分間程度となる。The heating time of the semi-heating step and the soaking step cannot be unconditionally determined because it depends on the type of material to be heated, etc., but the total heating time of both steps is
Usually, it will be about 10 to 40 minutes.
【００１６】このように準加熱段階で被加熱素材が加熱
されるので、該被加熱素材自体の熱伝導により、温度が
低い該被加熱素材の中心方向に熱が伝導し、該被加熱素
材の全体が均熱される。Since the material to be heated is heated in the semi-heating step in this manner, the heat conduction of the material to be heated itself causes the heat to be transferred toward the center of the material to be heated, which has a low temperature. The whole is soaked.
【００１７】また、周波数を加熱段階と変えずに一定に
して加熱するので、周波数を高めたばあいのように、被
加熱素材の表面部の発熱量が相対的に多くなり、その結
果、内部の昇温が遅れて内部温度の低下を招いたり、周
波数を下げたばあいのように、内部の発熱量が多くな
り、その内部が先に昇温し、その結果、過加熱状態にな
ってしまうというようなことがない。Further, since the heating is performed with the frequency kept constant without changing from the heating stage, the calorific value of the surface portion of the material to be heated becomes relatively large as in the case of raising the frequency, and as a result, the internal As the temperature rise is delayed and the internal temperature is lowered, or as the frequency is lowered, the amount of heat generated inside increases, and the inside heats up first, resulting in overheating. There is no such thing.
【００１８】つぎに、均熱段階においては、前記加熱段
階および準加熱段階における周波数ｆ0よりも高い周波
数ｆ1で、投入電力を準加熱段階よりも低くして被加熱
素材を加熱し、該被加熱素材の表面温度と中心温度との
温度偏差が所定の範囲に達した時点で加熱を終了する。Next, in the soaking step, the material to be heated is heated at a frequency f 1 which is higher than the frequency f 0 in the heating step and the quasi-heating step and the applied electric power is made lower than that in the quasi-heating step. When the temperature deviation between the surface temperature and the central temperature of the material to be heated reaches a predetermined range, the heating is finished.
【００１９】前記均熱段階における周波数ｆ1は、準加
熱段階と比べて、より表層部分を加熱する点から、加熱
段階および準加熱段階における周波数ｆ0よりも１０Ｈ
ｚ以上、好ましくは３０Ｈｚ以上、さらに好ましくは５
０Ｈｚ以上高くすることが望ましい。The frequency f 1 in the soaking step is 10H higher than the frequency f 0 in the heating step and the quasi-heating step because the surface layer portion is heated more than in the quasi-heating step.
z or higher, preferably 30 Hz or higher, more preferably 5
It is desirable that the frequency be higher than 0 Hz.
【００２０】前記被加熱素材の表面温度と中心温度との
温度偏差は、被加熱素材の最終製品段階での品質のバラ
ツキの点から、２０℃以下であることが好ましい。The temperature deviation between the surface temperature and the central temperature of the material to be heated is preferably 20 ° C. or less from the viewpoint of quality variation in the final product stage of the material to be heated.
【００２１】このように、均熱段階においては、周波数
を高めて被加熱素材を加熱するので、該被加熱素材の表
面部の発熱量が相対的に多くなり、その結果、該被加熱
素材の表面部、とくに端面における熱放散による温度低
下を補償することができる。As described above, in the soaking step, since the material to be heated is heated by increasing the frequency, the calorific value of the surface portion of the material to be heated becomes relatively large, and as a result, the material to be heated is heated. It is possible to compensate for the temperature drop due to heat dissipation at the surface, especially at the end faces.
【００２２】また、投入電力を下げて加熱するので、均
熱段階では急激な温度変化を伴なうようなことがなく、
熱伝導により、被加熱素材全体の温度偏差が解消され、
該被加熱素材全体をいわゆる熟熱させることができる。Further, since the applied electric power is lowered to heat, there is no sudden temperature change at the soaking stage,
Due to heat conduction, the temperature deviation of the whole heated material is eliminated,
The whole heated material can be so-called matured.
【００２３】本発明の被加熱素材の誘導加熱方法によれ
ば、加熱時に被加熱素材においてもっとも温度が高くな
る部分の表面温度を監視しながら加熱を行なうことがで
きるので、該被加熱素材が過加熱されることがなく、そ
の結果、該被加熱素材に溶融する部分が生じるようなこ
とがない。このため、溶融しない部分と異なる結晶粒が
溶融によって生成されないので、被加熱素材に品質のバ
ラツキがなくなり、溶融によって気泡が生成されるよう
なことがないので、形状不良による圧延トラブルの発生
を抑制することができる。According to the induction heating method for a material to be heated of the present invention, it is possible to perform heating while monitoring the surface temperature of the portion of the material to be heated which is the highest in temperature during heating. The material to be heated is not heated, and as a result, there is no occurrence of a molten portion in the material to be heated. For this reason, the crystal grains that are different from the unmelted portion are not generated by melting, so there is no variation in quality of the heated material, and bubbles do not occur due to melting, suppressing the occurrence of rolling troubles due to defective shapes can do.
【００２４】また、本発明の被加熱素材の誘導加熱方法
によれば、均熱段階において内部までの熟熱と端面の放
熱分の補償を適切に行なうことができるので、誘導加熱
終了時には被加熱素材は均温性にすぐれたものとなる。Further, according to the induction heating method of the material to be heated of the present invention, it is possible to appropriately perform the mature heat up to the inside and the compensation of the heat radiation of the end face in the soaking step. The material has excellent temperature uniformity.
【００２５】なお、本発明においては、誘導加熱炉で誘
導加熱するまえに、誘導加熱時の使用電力量の低減（省
エネルギー）および生産性の向上の点から、あらかじめ
前記誘導加熱素材を燃料燃焼炉でキュリー点（磁気変態
点）以上、好ましくは１０００〜１３５０℃程度にまで
予備加熱してもよい。In the present invention, before induction heating in the induction heating furnace, the induction heating material is preliminarily used in the fuel combustion furnace in order to reduce the amount of electric power used during induction heating (energy saving) and improve productivity. Then, preheating may be performed up to the Curie point (magnetic transformation point) or higher, preferably about 1000 to 1350 ° C.
【００２６】[0026]
【実施例】つぎに、本発明の被加熱素材の誘導加熱方法
を実施例にもとづいてさらに詳細に説明するが、本発明
はかかる実施例のみに限定されるものではない。EXAMPLES Next, the induction heating method of the material to be heated of the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.
【００２７】実施例１〜３ 炉内の雰囲気温度が１１５０〜１２００℃である燃料燃
焼炉で、板厚２００ｍｍ、板幅１０００ｍｍ、長さ１０
ｍの電磁鋼スラブを平均温度が１１００℃になるように
あらかじめ燃焼加熱した。Examples 1 to 3 In a fuel combustion furnace in which the atmospheric temperature in the furnace is 1150 to 1200 ° C., the plate thickness is 200 mm, the plate width is 1000 mm, and the length is 10.
The electromagnetic steel slab of m was preheated by combustion so that the average temperature was 1100 ° C.
【００２８】まず、加熱段階として、周波数ｆ0を１０
０Ｈｚに、また投入電力Ｗ0を８ＭＷに設定し、前記あ
らかじめ燃焼加熱された電磁鋼スラブをその表面温度が
所定の温度、すなわち１３５０℃となるまで、誘導加熱
炉内で加熱した。First, as the heating step, the frequency f 0 is set to 10
With the input power W 0 set to 0 Hz and the input power W 0 set to 8 MW, the pre-combustion-heated electromagnetic steel slab was heated in the induction heating furnace until its surface temperature reached a predetermined temperature, that is, 1350 ° C.
【００２９】この加熱された電磁鋼スラブの加熱に要し
た時間は２０分間であり、また実施例１〜３のいずれに
おいても電磁鋼スラブの表面温度（スラブの長さ方向中
央かつ幅方向中央）は１３５０℃、中心温度（スラブの
長さ方向中央、幅方向中央かつ厚さ方向中央）は１２８
０℃であり、表面温度と中心温度との温度偏差が７０℃
であった。The time required for heating the heated electromagnetic steel slab was 20 minutes, and in all of Examples 1 to 3, the surface temperature of the electromagnetic steel slab (the center of the slab in the length direction and the center of the width direction). Is 1350 ° C. and the center temperature (center of the slab in the length direction, center in the width direction and center in the thickness direction) is 128.
0 ° C, the temperature deviation between the surface temperature and the center temperature is 70 ° C
Met.
【００３０】つぎに、準加熱段階として、周波数ｆ0を
１００Ｈｚに保持した状態で、電磁鋼スラブの表面温度
が１３５０℃で一定に保たれるようにして、投入電力Ｗ
1を初期の投入電力Ｗ0（８ＭＷ）の５０％にし（４Ｍ
Ｗ）、１０分間（実施例１）、７分間（実施例２）また
は４分間（実施例３）かけて低下させながら誘導加熱炉
内で加熱した。Next, as a quasi-heating step, while the frequency f 0 is kept at 100 Hz, the surface temperature of the electromagnetic steel slab is kept constant at 1350 ° C.
Set 1 to 50% of the initial input power W 0 (8 MW) (4M
W) Heating was performed in the induction heating furnace while lowering over 10 minutes (Example 1), 7 minutes (Example 2) or 4 minutes (Example 3).
【００３１】この準加熱段階終了時の電磁鋼スラブの表
面温度および中心温度ならびにそれらの温度偏差を表１
に示す。Table 1 shows the surface temperature and center temperature of the electromagnetic steel slab and the temperature deviation thereof at the end of this semi-heating step.
Shown in
【００３２】つぎに、均熱段階として、周波数ｆ0（１
００Ｈｚ）をｆ1（１５０Ｈｚ）に高め、電磁鋼スラブ
の表面温度が１３５０℃で一定になるようにしながら、
投入電力を徐々に低下させ、表１に示す時間加熱を行な
った。Next, as the soaking step, the frequency f 0 (1
(00 Hz) to f 1 (150 Hz) so that the surface temperature of the electromagnetic steel slab becomes constant at 1350 ° C.
The applied power was gradually reduced and heating was performed for the time shown in Table 1.
【００３３】この均熱段階終了時の電磁鋼スラブの表面
温度および中心温度ならびにそれらの温度偏差を表１に
示す。Table 1 shows the surface temperature and center temperature of the electromagnetic steel slab at the end of this soaking step and their temperature deviations.
【００３４】つぎに、加熱処理が施された電磁鋼スラブ
を圧延し、えられた電磁鋼板の品質として鉄損値（Ｗ１
７／５０：周波数５０Ｈｚ、最大磁束密度１．７Ｔのと
きの鉄損の値）を調べた。その結果を表１に示す。Next, the heat-treated electromagnetic steel slab is rolled, and the iron loss value (W1
7/50: iron loss value at a frequency of 50 Hz and maximum magnetic flux density of 1.7 T) was investigated. Table 1 shows the results.
【００３５】比較例１〜２ 実施例１において、準加熱段階を行なわずに、均熱段階
における周波数を１５０Ｈｚ（比較例１）または１００
Ｈｚ（比較例２）とし、表面温度（１３５０℃）が一定
となるように投入電力Ｗ0（８ＭＷ）を徐々に低下させ
る均熱段階を２０分間行なったほかは、実施例１と同様
にして電磁鋼スラブの加熱処理を行なった。Comparative Examples 1 and 2 In Example 1, the frequency in the soaking step was 150 Hz (Comparative Example 1) or 100 without the semi-heating step.
Hz (Comparative Example 2), the same as in Example 1 except that a soaking step of gradually reducing the applied power W 0 (8 MW) so that the surface temperature (1350 ° C.) was constant was performed for 20 minutes. The electromagnetic steel slab was heat-treated.
【００３６】つぎに、実施例１と同様にして電磁鋼板を
作製し、その品質として鉄損値を調べた。その結果を表
１に示す。Next, an electromagnetic steel sheet was produced in the same manner as in Example 1, and the iron loss value was investigated as its quality. Table 1 shows the results.
【００３７】なお、表１中、品質評点は、以下の評価基
準にもとづく。In Table 1, the quality scores are based on the following evaluation criteria.
【００３８】［評価基準］ Ａランク：鉄損値が良好であり、バラツキが小さい。 Ｂランク：鉄損値が良好であり、バラツキが若干あり。 Ｃランク：鉄損値が低いが、バラツキが小さい。 Ｄランク：鉄損値が低く、バラツキが大きい。[Evaluation Criteria] Rank A: The iron loss value is good and the variation is small. Rank B: The iron loss value is good and there is some variation. Rank C: The iron loss value is low, but the variation is small. Rank D: The iron loss value is low and the variation is large.
【００３９】[0039]
【表１】 [Table 1]
【００４０】表１に示された結果から、実施例１〜３に
おけるように、加熱段階と均熱段階とのあいだに準加熱
段階を設けることにより、比較例１〜２と対比して明ら
かなように、えられる電磁鋼板の鉄損値を小さくし、品
質の向上を図ることができることがわかる。From the results shown in Table 1, it is clear as compared with Comparative Examples 1 and 2 by providing a semi-heating step between the heating step and the soaking step as in Examples 1 to 3. Thus, it is understood that the iron loss value of the obtained electromagnetic steel sheet can be reduced and the quality can be improved.
【００４１】[0041]
【発明の効果】本発明の被加熱素材の誘導加熱方法によ
れば、被加熱素材全体を均温に誘導加熱することができ
るので、その結果、品質にすぐれた電磁鋼板を製造する
ことができるという効果が奏される。According to the induction heating method of a material to be heated of the present invention, the whole material to be heated can be induction-heated uniformly, and as a result, a magnetic steel sheet having excellent quality can be manufactured. The effect is played.
【図１】本発明の被加熱素材の誘導加熱方法の各加熱段
階での周波数、投入電力、ならびに被加熱素材の表面温
度および中心温度の関係を示す説明図である。FIG. 1 is an explanatory diagram showing a relationship between a frequency, input electric power, and a surface temperature and a center temperature of a material to be heated in each heating stage of an induction heating method for a material to be heated of the present invention.
フロントページの続き (72)発明者 後藤 武嗣 兵庫県姫路市広畑区富士町１番地 新日本 製鐵株式会社広畑製鐵所内Continued Front Page (72) Inventor Taketsugu Goto 1 Fuji-machi, Hirohata-ku, Himeji-shi, Hyogo Shin Nippon Steel Corp. Hirohata Works
Claims (2)
たのち、所定時間均熱保持する加熱方法であって、被加
熱素材を誘導加熱炉内で昇温させる加熱段階と、前記加
熱段階よりも周波数を高くし、かつ投入電力を下げて加
熱する均熱段階とのあいだに、前記加熱段階での誘導加
熱と同一の周波数で、かつ前記加熱段階よりも投入電力
を下げて加熱する準加熱段階を設けることを特徴とする
被加熱素材の誘導加熱方法。1. A heating method comprising heating a material to be heated to a high temperature in an induction heating furnace and then holding the material soaking for a predetermined time, the heating step comprising raising the temperature of the material to be heated in the induction heating furnace, and the heating step. The heating temperature is higher than that of the induction heating in the heating step, and the heating power is lower than that in the heating step. An induction heating method for a material to be heated, which comprises providing a heating step.
に、燃料燃焼炉で予備加熱する請求項１記載の被加熱素
材の誘導加熱方法。2. The method of induction heating of a material to be heated according to claim 1, wherein the material to be heated is preheated in a fuel combustion furnace before being heated in the induction heating furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33075095A JP3370499B2 (en) | 1995-12-19 | 1995-12-19 | Induction heating method for heated material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33075095A JP3370499B2 (en) | 1995-12-19 | 1995-12-19 | Induction heating method for heated material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09170021A true JPH09170021A (en) | 1997-06-30 |
| JP3370499B2 JP3370499B2 (en) | 2003-01-27 |
Family
ID=18236140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33075095A Expired - Fee Related JP3370499B2 (en) | 1995-12-19 | 1995-12-19 | Induction heating method for heated material |
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| Country | Link |
|---|---|
| JP (1) | JP3370499B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6891139B2 (en) | 2002-04-08 | 2005-05-10 | Jfe Steel Corporation | Heat treatment apparatus, heat treatment method, medium on which heat treatment program is recorded, and steel product |
| JP2009520882A (en) * | 2005-12-22 | 2009-05-28 | アルヴェディ，ジョヴァンニ | Method and plant for discontinuously manufacturing steel strip |
-
1995
- 1995-12-19 JP JP33075095A patent/JP3370499B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6891139B2 (en) | 2002-04-08 | 2005-05-10 | Jfe Steel Corporation | Heat treatment apparatus, heat treatment method, medium on which heat treatment program is recorded, and steel product |
| KR100585540B1 (en) * | 2002-04-08 | 2006-05-30 | 제이에프이 스틸 가부시키가이샤 | Heat treating device, heat treating method, recording medium recording heat treating program and steel product |
| JP2009520882A (en) * | 2005-12-22 | 2009-05-28 | アルヴェディ，ジョヴァンニ | Method and plant for discontinuously manufacturing steel strip |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3370499B2 (en) | 2003-01-27 |
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