JP4630130B2 - Electrical heating method for steel strip - Google Patents
Electrical heating method for steel strip Download PDFInfo
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- JP4630130B2 JP4630130B2 JP2005155773A JP2005155773A JP4630130B2 JP 4630130 B2 JP4630130 B2 JP 4630130B2 JP 2005155773 A JP2005155773 A JP 2005155773A JP 2005155773 A JP2005155773 A JP 2005155773A JP 4630130 B2 JP4630130 B2 JP 4630130B2
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Description
本発明は、連続送給される鋼帯を、該鋼帯の入側に配置された通電ロールに接触させるとともに、該鋼帯の出側に配置された金属浴に接触させ、前記通電ロールと金属浴を電極とし電極間の鋼帯に通電して加熱する鋼帯の通電加熱方法に関する。
具体的には、大量生産される鋼帯を連続的に高速送給しつつ、通電ロールを用いて電流を流して加熱する方法であって、例えば鋼帯を焼入れ、焼なまし、メッキ用予熱などの各種熱処理のために加熱する際に用いられる鋼帯の通電加熱方法に関する。
According to the present invention, the steel strip that is continuously fed is brought into contact with the energizing roll disposed on the entry side of the steel strip, and is brought into contact with the metal bath disposed on the exit side of the steel strip. The present invention relates to a method for electrically heating a steel strip that uses a metal bath as an electrode and energizes and heats the steel strip between the electrodes.
Specifically, it is a method in which a steel strip to be mass-produced is continuously fed at high speed and heated by passing an electric current using an energizing roll. For example, the steel strip is quenched, annealed, and preheated for plating. The present invention relates to an electric heating method for a steel strip used for heating for various heat treatments.
鋼帯を焼入れ、焼なまし、メッキ用予熱などの各種熱処理のために加熱する際に用いられる鋼帯の通電加熱方法に関しては、従来から種々の提案がなされている。
例えば、実公平6−30844号公報には、連続式溶融亜鉛メッキ設備において、鋼帯が走行する空間を形成したリングトランスの入側に設けた通電ロールと溶融亜鉛浴とを導電部材で接続することにより2次閉回路を構成し、リングトランスによって2次閉回路に誘起する電圧で鋼帯に電流を流し加熱する設備において、鋼帯の抵抗と通電部材の抵抗を特定範囲にするとともに、コンパクトで安価な雰囲気加熱装置を採用した連続式溶融亜鉛メッキ設備が提案されている。
しかし、通電ロールを用いた従来の通電加熱方法においては、鋼帯を接続する溶接点での繋ぎ目が通電ロールを通過する際にスパークによる鋼帯およびロールへの疵発生防止のため通電電流をカットする場合があり、通電電流をカットするとその間は通電ロールと溶融亜鉛浴との間にある鋼帯には電流が流れないため、溶融亜鉛浴に浸入する最終到達板温が低下するという問題があった。
For example, in Japanese Utility Model Publication No. 6-30844, in a continuous hot dip galvanizing facility, a conductive roll provided on the entrance side of a ring transformer that forms a space in which a steel strip travels and a hot dip zinc bath are connected by a conductive member. In a facility that configures a secondary closed circuit and heats the steel strip with a voltage induced in the secondary closed circuit by a ring transformer, the resistance of the steel strip and the resistance of the current-carrying member are within a specific range and compact. In addition, a continuous hot-dip galvanizing facility that employs an inexpensive and inexpensive atmosphere heating device has been proposed.
However, in the conventional energization heating method using the energizing roll, when the joint at the welding point connecting the steel strip passes through the energizing roll, the energizing current is applied to prevent the generation of wrinkles on the steel strip and the roll due to the spark. There is a problem that when the energizing current is cut, the current does not flow through the steel strip between the energizing roll and the molten zinc bath, and the final temperature of the plate entering the molten zinc bath decreases. there were.
本発明は、溶接点を有する鋼帯を通電ロール電極と浴電極を用いて通電し加熱する鋼 帯の通電加熱方法における前述のような従来技術の問題点を解決し、溶接点の前後で通 電カットを行う場合であっても鋼帯の最終到達板温を確保することができる鋼帯の通電 加熱方法を提供することを課題とする。 The present invention solves the above-described problems of the prior art in the method of energizing and heating a steel strip having a welding point by energizing and heating the steel strip using an energizing roll electrode and a bath electrode. It is an object of the present invention to provide a method for energizing and heating a steel strip that can ensure the final temperature of the steel strip even when performing electrical cutting.
本発明は、上記課題を解決するために鋭意検討の結果なされたものであり、溶接点が通電ロールを通過する際に行う通電カットにより最終到達板温が低下する量だけ、通電カット前後の電流を多めに供給することにより、鋼帯の最終到達板温を確保することができる鋼帯の通電加熱方法を提供するものであり、その要旨とするところは特許請求の範囲に記載した通りの下記内容である。
(1)連続送給される鋼帯を、該鋼帯の入側に配置された通電ロールに接触させるとともに、該鋼帯の出側に配置された金属浴に接触させ、前記通電ロールと金属浴を電極とし電極間の鋼帯に通電して加熱する鋼帯の通電加熱方法であって、前記鋼帯の溶接点が通電ロールを通過する際に電流を停止する通電カットにより前記鋼帯の最終到達板温に見合う電流に対して不足する電流を、前記通電カットの前後に通常の設定電流に加えて供給することにより、前記鋼帯の最終到達板温を確保することを特徴とする通電加熱方法。
The present invention has been made as a result of intensive studies in order to solve the above-described problems, and the current before and after the energization cut is the amount by which the final reached plate temperature is reduced by the energization cut performed when the welding point passes through the energization roll. By providing a larger amount, the present invention provides a method for energizing and heating a steel strip that can ensure the final temperature of the steel strip, and the gist of the method is as follows. Content.
(1) A steel strip that is continuously fed is brought into contact with an energizing roll disposed on the entry side of the steel strip, and is brought into contact with a metal bath disposed on the exit side of the steel strip. An electric heating method for a steel strip in which a bath is used as an electrode to energize and heat the steel strip between the electrodes, and the steel strip is energized by cutting off the current when the welding point of the steel strip passes through the energizing roll. Energization characterized by securing the final ultimate plate temperature of the steel strip by supplying a current that is insufficient with respect to the current corresponding to the final ultimate plate temperature in addition to the normal set current before and after the energization cut. Heating method.
本発明により、溶接点が通電ロールを通過する際に行う通電カットにより最終到達板温が低下する量だけ、通電カット前後の電流を多めに供給することにより、通電ロール付近で通電電流をカットしても、鋼帯の最終到達板温を確保することによりメッキ品位を確保することができ、鋼帯の歩留り向上を図ることができるなど、産業上有用な著しい効果を奏する。 According to the present invention, the energizing current is cut in the vicinity of the energizing roll by supplying a larger amount of current before and after the energizing cut by the amount that the final plate temperature is lowered by the energizing cut performed when the welding point passes the energizing roll. However, it is possible to ensure the plating quality by ensuring the final temperature of the steel strip, and to achieve remarkable industrially useful effects such as improvement of the yield of the steel strip.
以下、本発明を適用した通電加熱方法の実施形態を図1を参照して説明する。なお、この実施形態は、鋼帯を溶融メッキするために予熱する装置である。
図1Aは、本発明における鋼帯の通電加熱方法の実施形態を例示する図である。
リングトランス20によって鋼帯Wに誘起される電圧は通電ロール3および金属浴30を介して導電部材14を帰線として流れ、鋼帯Wが加熱される。通電ロール3の中心から浴32への浸漬点までの鋼帯Wの長さが加熱長L1となる。
金属浴30は、浴漕31に溶融金属32を満たして構成され、導電部材14の端部が溶融金属32内に浸されている。通電加熱されて送られる鋼帯Wは、方向転換ロールR5によって方向を変えられ、溶融金属32内に浸され、方向転換ロールR6によって方向を転換されて排出される。また、導電部材14は、通電ロール3の直後で上側部分14a、下側部分14bに分かれ、方向転換ロールR5の直前で1つにまとめられ、方向転換ロールR5の直後で再び上側部分14c、下側部分14dに分かれて、上側部分14c、下側部分14dがそれぞれ溶融金属32内に浸される。溶融金属としては、例えば溶融亜鉛、溶融亜鉛系合金が採用できる。
Hereinafter, an embodiment of an electric heating method to which the present invention is applied will be described with reference to FIG. In addition, this embodiment is an apparatus which preheats in order to hot-plate a steel strip.
FIG. 1A is a diagram illustrating an embodiment of a method for electrically heating a steel strip in the present invention.
The voltage induced in the steel strip W by the
The
図1Bは、図1Aにおける通電ロール周りの詳細図である。
図1において、1は前材、2は後材、3は通電ロール(CDR)、L2は通電ロール中心から溶接点までの距離を示す。
図1に示すように、本発明が加熱対象とする鋼帯は、前材1と後材2が溶接点で接合されており、通電ロール(CDR)3の中心から加熱長L1の距離まで電流が供給されて、常温から例えば450℃程度の最終到達温度まで加熱される。
加熱された鋼帯は、メッキ浴に浸漬されてメッキが施されるが、鋼帯温度が目標とする最終到達温度から外れると不メッキや不均一なメッキが発生してしまう。
一方、溶接点が通電ロール(CDR)3を通過する際には、溶接点の凹凸によってスパークが発生して通電ロール3や鋼帯に疵が発生する場合があるためスパーク防止のため通電を停止する電流カットを行うが、この際の板温低下が問題となっていた。
FIG. 1B is a detailed view around the energizing roll in FIG. 1A.
In FIG. 1, 1 is a front material, 2 is a rear material, 3 is an energizing roll (CDR), and L2 is a distance from the center of the energizing roll to a welding point.
As shown in FIG. 1, in the steel strip to be heated by the present invention, a
The heated steel strip is immersed in a plating bath to be plated. However, if the steel strip temperature deviates from the target final temperature, unplating or non-uniform plating occurs.
On the other hand, when the welding point passes through the energizing roll (CDR) 3, the energization of the
そこで本発明の通電加熱は、溶接点を有する鋼帯を通電ロール(CDR)3と金属浴30を電極として用いて通電し加熱する鋼帯の通電加熱方法であって、前記溶接点が通電ロール3を通過する際に電流を停止する通電カットにより前記鋼帯の最終到達板温に見合う電流に対して不足する電流を、前記通電カットの前後に通常の設定電流に加えて供給することにより、鋼帯の最終到達板温を確保することを特徴とする。
本発明者等は、前材1および後材2を接合する溶接点が通電ロール(CDR)3を通過する際に電流を停止する電流カットによる不足電流の補償量および補償距離について鋭意検討を行った結果、溶接点が通電ロールを通過する際に電流を停止させる通電カットにより最終到達板温が低下する量だけ、通電カットト前後の電流を多めに供給することにより鋼帯の最終到達板温を確保することができ、メッキ品位を確保することができることを見出した。
Accordingly, the current heating of the present invention is a method for electrically heating a steel strip in which a steel strip having a welding point is energized and heated using a current roll (CDR) 3 and a
The present inventors have intensively studied the compensation amount and the compensation distance of the insufficient current by the current cut that stops the current when the welding point joining the
本発明の通電加熱方法を用いて図1Bに示す溶接点を有する鋼帯を図1Aに示す金属浴として溶融亜鉛浴を採用し、下記の条件で加熱した実施例を図2および図3に示す。
<実施条件>
・加熱長L1:18m
・通電カット長さ:1m
・最終到達温度:450℃
FIG. 2 and FIG. 3 show an embodiment in which a hot-dip zinc bath is employed as the metal bath shown in FIG. 1A and the steel strip having the weld point shown in FIG. .
<Conditions for implementation>
・ Heating length L1: 18m
-Current cut length: 1m
・ Final temperature: 450 ℃
図2に50℃から最終到達温度である450℃まで加熱したときの板温分布を1m刻みで示す(加熱長L1:18m)。
図2から分かるように、温度分布は2次曲線状になっており、最後の1m(17→18 m間)で30℃の温度上昇となっていることから、1mの通電カットで約30℃のメッキ浴 浸入板温の低下となることがわかった。
従って、目標温度(450℃)に対して不足する30℃の温度補償を行う必要があるため、これを必要な熱量比に換算することによって、
((450+30℃)/450℃)1/2=約1.04倍(対450℃加熱設定)の電流補償を実施すればよいことがわかった。
また、溶接点前後の電流補償を溶接点前後の必要距離だけ行うが、この距離は、加熱長、最終到達温度、通電カット長さの条件より、補償量の過不足が発生しないような長さとして求める。補償量30℃にて、シミュレーションを実施した結果、溶接点前後6m程度が最適となったため、これをベース条件とした。
FIG. 2 shows the plate temperature distribution in increments of 1 m when heated from 50 ° C. to 450 ° C., which is the final temperature reached (heating length L1: 18 m).
As can be seen from FIG. 2, the temperature distribution is a quadratic curve, and the temperature rises by 30 ° C in the last 1m (between 17 → 18m). It was found that the temperature of the infiltration plate decreased.
Therefore, since it is necessary to perform temperature compensation of 30 ° C. which is insufficient with respect to the target temperature (450 ° C.), by converting this to a necessary heat quantity ratio,
((450 + 30 ° C) / 450 ° C) 1/2 = About 1.04 times (vs. 450 ° C heating setting) Current compensation should be performed.
In addition, current compensation before and after the welding point is performed only for the required distance before and after the welding point. This distance is such that the compensation amount does not become excessive or insufficient due to the conditions of the heating length, final temperature reached, and energization cut length. Asking. As a result of performing the simulation at a compensation amount of 30 ° C., about 6 m before and after the welding point became optimum, and this was set as the base condition.
図3は、本発明の通電加熱方法における通電ロール付近での通電電流カットに伴う制御結果を示す図であり、横軸は加熱時間(秒)、縦軸はメッキ浴(ポット)浸入温度(℃)を示す。
板厚3.0mm、板巾1200mmの同サイス゛鋼板の溶接部繋ぎ目を約1秒間通電カットしたところ、図3の点線で示すように、最終到達板温が加熱長に相当する長さ分目標温度450℃より約30℃ほど低下した。
そこで通電カット前後それぞれ6mの電流を、最終到達板温の低下量30℃に相当する分だけ増加させた結果、溶接点前後の最終到達板温は通電「切・入」の瞬間は目標±15℃、残りの部分は目標温度-10℃以内となり、必要な板温精度内に収めることができた。
次に断面積が異なる鋼帯の溶接部繋ぎ目でも同様の制御を行ったところ、上記と同様の結果が得られた。
FIG. 3 is a diagram showing a control result associated with an energization current cut in the vicinity of an energization roll in the energization heating method of the present invention, where the horizontal axis represents the heating time (seconds), and the vertical axis represents the plating bath (pot) infiltration temperature (° C. ).
When the weld joint of the same size steel plate with a plate thickness of 3.0mm and a plate width of 1200mm was cut for about 1 second, as shown by the dotted line in Fig. 3, the final temperature reached the target temperature corresponding to the heating length. The temperature dropped from 450 ° C by about 30 ° C.
Therefore, as a result of increasing the current of 6 m before and after the energization cut by an amount corresponding to the amount of decrease in the final ultimate plate temperature of 30 ° C., the final ultimate plate temperature before and after the welding point is the target ± 15 at the instant of energization “off / on”. The remaining temperature was within -10 ° C, which was within the required plate temperature accuracy.
Next, when the same control was performed at the weld joints of steel strips having different cross-sectional areas, the same result as above was obtained.
1 前材
2 後材
3 通電ロール
14 導電部材
20 リングトランス
30 金属浴
31 浴漕
32 溶融金属
R5、R6 方向転換ロール
W 鋼帯
L1 加熱長
L2 通電ロール中心から溶接点までの距離
DESCRIPTION OF
Claims (1)
The steel strip that is continuously fed is brought into contact with an energizing roll disposed on the entry side of the steel strip, and is brought into contact with a metal bath disposed on the exit side of the steel strip, and the energizing roll and the metal bath are connected to electrodes. A method for heating and heating a steel strip by energizing and heating the steel strip between the electrodes, wherein the steel plate is finally reached by an energization cut that stops the current when the welding point of the steel strip passes through the energizing roll. An energizing heating method characterized in that a final temperature of the steel strip is ensured by supplying an insufficient current with respect to a current commensurate with a temperature in addition to a normal set current before and after the energization cut.
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CN109234504B (en) * | 2018-10-23 | 2020-08-07 | 北京航星机器制造有限公司 | Electric heating automatic clamping and quenching integrated device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0562761A (en) * | 1991-08-29 | 1993-03-12 | Nippon Steel Corp | Electric heating device |
JPH07268492A (en) * | 1994-03-29 | 1995-10-17 | Nippon Steel Corp | Electric heating method of metallic strip |
JPH07331340A (en) * | 1994-06-06 | 1995-12-19 | Nippon Steel Corp | Method for electrically heating metal strip |
JPH08176684A (en) * | 1994-12-27 | 1996-07-09 | Nippon Steel Corp | Electric heating of thin steel sheet |
JPH093554A (en) * | 1995-06-21 | 1997-01-07 | Nippon Steel Corp | Electric heating method |
-
2005
- 2005-05-27 JP JP2005155773A patent/JP4630130B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0562761A (en) * | 1991-08-29 | 1993-03-12 | Nippon Steel Corp | Electric heating device |
JPH07268492A (en) * | 1994-03-29 | 1995-10-17 | Nippon Steel Corp | Electric heating method of metallic strip |
JPH07331340A (en) * | 1994-06-06 | 1995-12-19 | Nippon Steel Corp | Method for electrically heating metal strip |
JPH08176684A (en) * | 1994-12-27 | 1996-07-09 | Nippon Steel Corp | Electric heating of thin steel sheet |
JPH093554A (en) * | 1995-06-21 | 1997-01-07 | Nippon Steel Corp | Electric heating method |
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