JP2006348374A - Method for heat-treating thick steel plate and apparatus therefor - Google Patents

Method for heat-treating thick steel plate and apparatus therefor Download PDF

Info

Publication number
JP2006348374A
JP2006348374A JP2005179535A JP2005179535A JP2006348374A JP 2006348374 A JP2006348374 A JP 2006348374A JP 2005179535 A JP2005179535 A JP 2005179535A JP 2005179535 A JP2005179535 A JP 2005179535A JP 2006348374 A JP2006348374 A JP 2006348374A
Authority
JP
Japan
Prior art keywords
steel plate
induction heating
thick steel
heating coil
pressing roll
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
Application number
JP2005179535A
Other languages
Japanese (ja)
Other versions
JP4955940B2 (en
Inventor
Masatoshi Sugioka
正敏 杉岡
Yoshimichi Hino
善道 日野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2005179535A priority Critical patent/JP4955940B2/en
Publication of JP2006348374A publication Critical patent/JP2006348374A/en
Application granted granted Critical
Publication of JP4955940B2 publication Critical patent/JP4955940B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

Landscapes

  • General Induction Heating (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for heat-treating a thick steel plate moving on a transportation line by using a high-frequency induction heating coil, and to provide an apparatus therefor. <P>SOLUTION: This method for heat-treating a thick steel plate by placing a pair of the upper and lower induction heating coils between transport rolls for transporting the thick steel plate, and induction-heating it at 40°C or higher while passing the thick steel plate between the upper and lower induction heating coils includes: placing a press roll at a position within 300 mm from an entrance end and a discharge end of the induction heating coil, or within 300 mm from the discharge end; and making the press roll which has been placed in a proceeding direction side of the thick steel plate press the thick steel plate from the upper surface side, while the thick steel plate is induction-heated. When a plurality of the induction heating coils are placed at predetermined spacing, the press roll is placed at a position within 300 mm from the entrance end and the discharge end, or within the discharge end of the induction heating coil for heating the thick steel plate at 40°C or higher. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、搬送ライン上を移動する厚鋼板を誘導加熱コイルで高周波誘導加熱する熱処理方法およびその装置に関し、特に移動加熱中の厚鋼板の変形を防止して安定に熱処理する方法に関する。   The present invention relates to a heat treatment method and apparatus for induction heating a thick steel plate moving on a conveyance line with an induction heating coil, and more particularly to a method for stably heat-treating the thick steel plate during deformation heating.

誘導加熱コイルにより厚鋼板を高周波誘導加熱（移動加熱）する加熱装置には、熱間圧延鋼材の側端部を部分的に加熱する装置や、鋼板の板幅全体を加熱する装置がある。   As a heating device for induction heating (moving heating) of a thick steel plate by an induction heating coil, there are a device for partially heating a side end portion of a hot rolled steel material and a device for heating the entire plate width of the steel plate.

厚鋼板製造においては、熱間圧延機と冷却装置および熱処理装置を同一ライン上に配置すると生産能力が著しく増大するため、小型でライン上に配置可能な高周波誘導加熱装置を熱処理装置として用いる厚鋼板製造設備が開発され、実用化されている。   In the production of thick steel plates, if a hot rolling mill, a cooling device, and a heat treatment device are arranged on the same line, the production capacity is remarkably increased. Therefore, a thick steel plate that uses a high-frequency induction heating device that can be arranged on the line as a heat treatment device. Manufacturing equipment has been developed and put into practical use.

特許文献１は厚鋼板の熱処理方法および装置に関し、熱間圧延後の厚鋼板を圧延機出側に設けた冷却装置で加速冷却した後、誘導加熱装置で熱処理する製造ラインが記載され、誘導加熱装置としてソレノイド型誘導加熱装置やトランスバース型誘導加熱装置を用いることが示されている。
特開２００３−１３１３３号公報 Patent Document 1 relates to a heat treatment method and apparatus for a thick steel plate, which describes a production line in which a hot-rolled thick steel plate is accelerated and cooled by a cooling device provided on the exit side of the rolling mill and then heat-treated by an induction heating device. It is shown that a solenoid type induction heating device or a transverse type induction heating device is used as the device.
JP 2003-13133 A

しかしながら、特許文献１記載の、搬送ライン上を移動する厚鋼板の周囲を誘導加熱コイルで取り囲み、高周波誘導加熱する方法は、加熱する前の冷却で生じた不均一な鋼板温度分布の影響により厚鋼板が均一に加熱されず厚鋼板に反りなどの歪みが生じやすい。反りが大きくなると搬送に支障が生じることがある。   However, the method described in Patent Document 1 that surrounds a thick steel plate moving on a conveyance line with an induction heating coil and performs high-frequency induction heating is based on the effect of uneven steel plate temperature distribution caused by cooling before heating. The steel plate is not heated uniformly, and distortion such as warpage is likely to occur in the thick steel plate. If the warpage becomes large, the conveyance may be hindered.

また、誘導加熱装置により厚鋼板を加熱する場合は、加熱が終了した部分が誘導加熱装置から搬出されるにつれて、磁束の一部も厚鋼板とともに引き出され、漏れ磁束となる。
漏れ磁束は、厚鋼板から搬送ロールにかけての閉回路を流れる誘導電流を発生させるので、上反りなどにより厚鋼板と搬送ロールとの間に空隙が生じると誘導電流によるスパークが発生し、厚鋼板端部や搬送ロール表面にスパーク痕が発生する場合もある。 Moreover, when heating a thick steel plate with an induction heating apparatus, a part of magnetic flux is also withdrawn with a thick steel plate and becomes a leakage magnetic flux, as the heated part is carried out of the induction heating apparatus.
Leakage magnetic flux generates an induced current that flows in a closed circuit from the thick steel plate to the transport roll. There may be a case where a spark mark is generated on the surface or the surface of the transport roll.

また、複数台の誘導加熱装置で逐次加熱する場合、厚鋼板の歪みは、搬送に支障を生じるばかりでなく、下流側の誘導加熱装置において厚鋼板の均一加熱を困難にするので、上流側の誘導加熱装置の出側において矯正されなければならない。   In addition, when sequentially heating with a plurality of induction heating devices, the distortion of the thick steel plate not only hinders the conveyance, but also makes it difficult to uniformly heat the thick steel plate in the downstream induction heating device. It must be corrected on the exit side of the induction heating device.

本発明は、誘導加熱時の厚鋼板の変形を防止し、漏洩磁束で厚鋼板から搬送ロールに形成される誘導電流によるスパークの発生も防止して安定な誘導加熱ができる厚鋼板熱処理方法およびその装置を提供することを目的とする。   The present invention relates to a thick steel plate heat treatment method capable of preventing the deformation of a thick steel plate during induction heating, preventing the occurrence of a spark due to an induction current formed from a thick steel plate to a conveying roll by leakage magnetic flux, and performing stable induction heating, and the method thereof An object is to provide an apparatus.

厚鋼板を誘導加熱する時に誘導加熱装置の出側の搬送ライン上で厚鋼板を詳細に観察した結果、以下のことを見出した。   As a result of observing the thick steel plate in detail on the delivery line on the outlet side of the induction heating device when induction heating the thick steel plate, the following was found.

高温の厚鋼板を冷却して熱処理する場合、均一冷却することが困難なため、冷却後の厚鋼板は幅方向や長手方向に歪みを持ち、その厚鋼板を誘導加熱すると、誘導加熱装置の出側で厚鋼板の幅方向や長手方向に目視で観察できる反りが生じる。   When a hot steel plate is cooled and heat-treated, it is difficult to cool uniformly, so the thick steel plate after cooling is distorted in the width direction and the longitudinal direction. On the side, a warp that can be visually observed occurs in the width direction or the longitudinal direction of the thick steel plate.

また、これらの反りは、誘導加熱装置で加熱する昇温量が特定温度以上になると、大きくなり、複数の誘導加熱装置で逐次加熱する場合には厚鋼板の先端が下流側の誘導加熱装置に衝突して損傷を与え、更に満足に搬送できなくなりスパークも発生する。   In addition, these warpages become larger when the amount of temperature rise heated by the induction heating device exceeds a specific temperature, and when sequentially heating with a plurality of induction heating devices, the tip of the thick steel plate becomes downstream of the induction heating device. It collides and damages, and it becomes impossible to convey it more satisfactorily and sparks are generated.

誘導加熱装置の出側直近で厚鋼板を上面から押しつけロールで押しつけると、反りが抑制でき、問題なく搬送できるうえに、スパークの発生も防止することができる。   When the thick steel plate is pressed from the upper surface with the pressing roll immediately near the exit side of the induction heating device, the warpage can be suppressed, it can be transported without problems, and the occurrence of sparks can also be prevented.

本発明は得られた知見を基に更に検討を加えてなされたもので、すなわち、本発明は、
１．厚鋼板を搬送する搬送ロール間に誘導加熱コイルを配置し、厚鋼板を前記誘導加熱コイル内を通過させながら誘導加熱する方法において、前記厚鋼板が通過する誘導加熱コイルの入側端部および出側端部から３００ｍｍ以内、または出側端部から３００ｍｍ以内に押し付けロールを配置し、厚鋼板を誘導加熱する間、誘導加熱コイルの出側に位置する押し付けロールで前記厚鋼板を上面側から押し付けることを特徴とする厚鋼板の誘導加熱方法。 The present invention was made by further study based on the obtained knowledge, that is, the present invention is
1. In the method of placing an induction heating coil between conveyance rolls for conveying a thick steel plate and performing induction heating while passing the thick steel plate through the induction heating coil, an inlet end and an exit of the induction heating coil through which the thick steel plate passes are arranged. A pressing roll is arranged within 300 mm from the side end or within 300 mm from the exit end, and the steel plate is pressed from the upper surface side with a pressing roll positioned on the exit side of the induction heating coil while induction heating the steel plate. An induction heating method for a thick steel plate.

２．厚鋼板を４０℃以上誘導加熱する場合、厚鋼板を誘導加熱する間、該厚鋼板を押し付けることを特徴とする１に記載の厚鋼板の誘導加熱方法。   2. 2. The method of induction heating of a thick steel plate according to 1, wherein the thick steel plate is pressed during induction heating of the thick steel plate at 40 ° C. or more.

３．複数の前記搬送ロール間に、誘導加熱コイルを配置し、厚鋼板を前記誘導加熱コイル内を通過させながら厚鋼板を誘導加熱する方法において、前記厚鋼板を４０℃以上加熱する誘導加熱コイルの入側端部および出側端部、または出側端部から３００ｍｍ以内に押し付けロールを配置し、厚鋼板を誘導加熱する間、誘導加熱コイルの出側に位置する押し付けロールで前記厚鋼板を上面側から押し付けることを特徴とする厚鋼板の誘導加熱方法。   3. An induction heating coil is disposed between the plurality of transport rolls, and in the method of induction heating the thick steel plate while passing the thick steel plate through the induction heating coil, an induction heating coil for heating the thick steel plate by 40 ° C. or more is inserted. While the pressing roll is disposed within 300 mm from the side end and the exit end, or the exit end, and the steel plate is induction-heated, the steel plate is placed on the upper surface side by the pressing roll positioned on the exit side of the induction heating coil. An induction heating method for a thick steel plate, characterized by being pressed from above.

４．厚鋼板を搬送する搬送ロールと、前記搬送ロール間に配置される誘導加熱コイルと、前記誘導加熱コイルの入側端部および出側端部、または出側端部から３００ｍｍ以内、且つ搬送ロールの上方に、押し付けロールを配置したことを特徴とする厚鋼板の熱処理装置。   4). A transport roll for transporting a thick steel plate, an induction heating coil disposed between the transport rolls, an entrance end and an exit end of the induction heating coil, or within 300 mm from the exit end, and the transport roll A heat treatment apparatus for a thick steel plate, wherein a pressing roll is disposed above.

５．４記載の厚鋼板の熱処理装置における搬送ロールは少なくとも表層がステンレス鋼で、押し付けロールは電気抵抗が厚鋼板より高いことを特徴とする厚鋼板の熱処理装置。   5.4 The thick steel plate heat treatment apparatus according to 5.4 is characterized in that at least the surface layer is stainless steel and the pressing roll has a higher electrical resistance than the thick steel plate.

本発明によれば、誘導加熱装置で厚鋼板を加熱する際、誘導加熱装置から引き出された先端部を押し付けロールにより押付けるので、厚鋼板の上反りを効果的に抑制でき、下流側への搬送や、２台目以降の誘導加熱装置への搬入が円滑に行われ、厚鋼板と搬送ロール間で生じるスパークの発生も防止でき、安定した加熱処理ができるので産業上極めて有用である。   According to the present invention, when the thick steel plate is heated by the induction heating device, the tip portion pulled out from the induction heating device is pressed by the pressing roll, so that the warpage of the thick steel plate can be effectively suppressed, and the downstream side is reduced. It is very useful industrially because it can be smoothly transported and carried into the second and subsequent induction heating apparatuses, can prevent the occurrence of sparks between the thick steel plate and the transport roll, and can perform stable heat treatment.

図３に誘導加熱装置を含む厚鋼板の製造設備の配置の一例を示す。圧延機７で熱間圧延された厚鋼板２は、冷却装置８により所定の冷却速度で、所定の冷却停止温度まで冷却される。その後、誘導加熱装置９により所定の温度に加熱され、ホットレベラー１０で加熱による歪が除去される。尚、厚鋼板とは板厚６ｍｍ以上の鋼板を指す。   FIG. 3 shows an example of the arrangement of manufacturing equipment for thick steel plates including an induction heating device. The thick steel plate 2 hot-rolled by the rolling mill 7 is cooled to a predetermined cooling stop temperature by the cooling device 8 at a predetermined cooling rate. Thereafter, the heat is heated to a predetermined temperature by the induction heating device 9, and the distortion caused by the heating is removed by the hot leveler 10. The thick steel plate refers to a steel plate having a thickness of 6 mm or more.

本発明は搬送ライン上に設置された誘導加熱装置により厚鋼板を高周波誘導加熱する熱処理方法に係り、押し付けロールを誘導加熱装置の入側端部および出側端部、または出側端部に配置し、厚鋼板が通過する誘導加熱装置の出側に位置する押付けロールで厚鋼板を押し付けて厚鋼板の上反りを抑制する。   The present invention relates to a heat treatment method in which a thick steel plate is induction-heated by an induction heating device installed on a conveyance line, and pressing rolls are arranged at an entrance end and an exit end or an exit end of the induction heating device. Then, the thick steel plate is pressed by a pressing roll located on the exit side of the induction heating device through which the thick steel plate passes to suppress the warpage of the thick steel plate.

本発明で押し付けロールとは上反りを抑制するように厚鋼板を拘束し、塑性変形は生じさせない力で押し付けるものを指し、誘導加熱装置の入側とは搬送ラインの上流側（圧延機側）、出側とは下流側（製品ヤード側）を指す。   In the present invention, the pressing roll refers to the one that restrains the thick steel plate so as to suppress warpage and presses it with a force that does not cause plastic deformation. The inlet side of the induction heating device is the upstream side of the conveying line (the rolling mill side). The exit side refers to the downstream side (product yard side).

図１は本発明の一実施形態に係る熱処理装置の構成を説明する模式図で、誘導加熱装置にはソレノイド型やトランスバース型があるが、いずれも誘導加熱コイルが組み込まれており、図において１はソレノイド型誘導加熱装置で１ａは上部誘導加熱コイル、１ｂは下部誘導加熱コイル、２は加熱される厚鋼板、３は搬送ロール、４は押し付けロールを示す。   FIG. 1 is a schematic diagram for explaining a configuration of a heat treatment apparatus according to an embodiment of the present invention. Induction heating apparatuses include a solenoid type and a transverse type, and both include induction heating coils. 1 is a solenoid type induction heating device, 1a is an upper induction heating coil, 1b is a lower induction heating coil, 2 is a thick steel plate to be heated, 3 is a transport roll, and 4 is a pressing roll.

押し付けロール４は誘導加熱装置１の出側直後の搬送ロール３の上方に配置し、
押し付けロール４と上部誘導加熱コイル１ａ（下部誘導加熱コイル１ｂ）の出側端部１１ａ（１１ｂ）との間隔ｅを３００ｍｍ以内とする。 The pressing roll 4 is disposed above the transport roll 3 immediately after the exit side of the induction heating device 1,
The distance e between the pressing roll 4 and the outlet side end portion 11a (11b) of the upper induction heating coil 1a (lower induction heating coil 1b) is set to be within 300 mm.

表１は押し付けロール４と上部誘導加熱コイル１ａ（下部誘導加熱コイル１ｂ）の出側端部１１ａ（１１ｂ）との間隔ｅを種々変化させた場合の搬送トラブル発生有無を観察した結果を示し、間隔ｅが、３００ｍｍ以内であれば、搬送トラブルは発生せず、間隔ｅが３５０ｍｍの場合に、厚鋼板は上反りして押付けロールに衝突する搬送トラブルが発生した。   Table 1 shows the result of observing whether or not there is a conveyance trouble when the distance e between the pressing roll 4 and the outlet end portion 11a (11b) of the upper induction heating coil 1a (lower induction heating coil 1b) is changed variously. When the distance e was within 300 mm, no conveyance trouble occurred. When the distance e was 350 mm, the thick steel plate warped and a conveyance trouble collided with the pressing roll occurred.

押し付けロール４と上部誘導加熱コイル１ａ（下部誘導加熱コイル１ｂ）の出側端部１１ａ（１１ｂ）との間隔ｅを３００ｍｍ以内として厚鋼板を押し付けることにより、上反りを抑えて、下流側への搬送や、２台目以降の誘導加熱装置への搬入に支障が生じないようにすることができる。間隔ｅの好ましい距離は、２５０ｍｍ以内である。   By pressing the thick steel plate with the distance e between the pressing roll 4 and the outlet side end portion 11a (11b) of the upper induction heating coil 1a (lower induction heating coil 1b) within 300 mm, the upward warpage is suppressed and the downstream side is suppressed. It is possible to prevent troubles in carrying and carrying into the second and subsequent induction heating apparatuses. A preferable distance of the interval e is 250 mm or less.

ここで、間隔ｅは、押し付けロール４の軸心を通る垂線ｂと上部誘導加熱コイル１ａ（下部誘導加熱コイル１ｂ）の出側端部１１ａ（１１ｂ）との最短距離とする。   Here, the interval e is the shortest distance between the perpendicular b passing through the axis of the pressing roll 4 and the outlet end portion 11a (11b) of the upper induction heating coil 1a (lower induction heating coil 1b).

また、厚鋼板２は誘導加熱装置１を通過しながら加熱され、加熱が終わるまで所定の時間を要するが、厚鋼板２が加熱されている間は、押し付けロール４により、押し付け力を付与する。   Further, the thick steel plate 2 is heated while passing through the induction heating device 1 and requires a predetermined time until the heating is finished. However, while the thick steel plate 2 is heated, a pressing force is applied by the pressing roll 4.

厚鋼板を誘導加熱する間、押し付けるとは、加熱された厚鋼板が誘導加熱コイルから出てくる時にその先端を押付けロールで押付け、加熱を終了するまでの間押し付けておくことを指す。加熱をしない間は、押し付けなくてもよいし押し付けたままにしておいても構わない。   Pressing during induction heating of a thick steel plate refers to pressing the tip of the heated steel plate with a pressing roll when it comes out of the induction heating coil, and pressing until the heating is finished. While not heating, it may not be pressed or may remain pressed.

厚鋼板２の誘導加熱では、加熱前と加熱後の温度差が４０℃以上になる加熱を行うと厚鋼板の上反りが大きくなるため、誘導加熱温度を４０℃以上とする場合、押し付けロール４により押し付け力を付与することが望ましい。   In the induction heating of the thick steel plate 2, since the warpage of the thick steel plate increases when the heating is performed so that the temperature difference between before and after heating is 40 ° C. or higher, when the induction heating temperature is 40 ° C. or higher, the pressing roll 4 It is desirable to apply a pressing force with

表２に種々の加熱温度で誘導加熱した際の、搬送トラブルの発生状況を示す。４０℃以上加熱された場合に押し付けロール４により押し付け力が付与されないと搬送トラブルが発生する。   Table 2 shows the occurrence of transport troubles when induction heating is performed at various heating temperatures. If the pressing force is not applied by the pressing roll 4 when heated at 40 ° C. or more, a conveyance trouble occurs.

尚、図１は誘導加熱装置１の出側に押し付けロール４を配置した場合を示すが、本発明では、誘導加熱装置の入側（上流側）にも押し付けロールを配置し、厚鋼板２を誘導加熱装置１で前後に通過させながら複数回加熱する場合、厚鋼板２が誘導加熱装置の出側から入側に向けて（下流側から上流側に向けて）通過する際、誘導加熱装置１の入側（上流側）において押し付け力が付与できるようにすることも可能である。   1 shows the case where the pressing roll 4 is arranged on the exit side of the induction heating apparatus 1, but in the present invention, the pressing roll is also arranged on the entry side (upstream side) of the induction heating apparatus, and the thick steel plate 2 is attached. When heating a plurality of times while passing back and forth with the induction heating device 1, when the thick steel plate 2 passes from the exit side to the entry side (from the downstream side to the upstream side) of the induction heating device, the induction heating device 1 It is also possible to apply a pressing force on the entry side (upstream side).

この場合、押し付けロールによる上反り防止効果は、厚鋼板の通過方向となる誘導加熱装置の入側（上流側）に配置された押し付けロールにより得られるので、搬送方向で下流側となる押し付けロールによる押し付けは付与してもしなくても良い。   In this case, since the upward warpage prevention effect by the pressing roll is obtained by the pressing roll arranged on the inlet side (upstream side) of the induction heating device in the passing direction of the thick steel plate, the pressing roll on the downstream side in the conveying direction The pressing may or may not be applied.

実操業において厚鋼板２の全長が、誘導加熱装置１の全長より長く、厚鋼板の先端部、後端部の両方が誘導加熱装置の外側にある状態で、中央部が加熱される場合が生じるが、その場合も誘導加熱装置１の出側で、厚鋼板の通過方向となる押し付けロールで押し付けを付与すれば良く、誘導加熱装置１の入側の押し付けロールにより押し付け力を付与する必要はない。   In actual operation, the total length of the thick steel plate 2 is longer than the total length of the induction heating device 1, and the central portion may be heated in a state where both the front end portion and the rear end portion of the thick steel plate are outside the induction heating device. However, in this case as well, it is only necessary to apply pressing with a pressing roll that is in the passing direction of the thick steel plate on the exit side of the induction heating device 1, and it is not necessary to apply pressing force with the pressing roll on the inlet side of the induction heating device 1. .

本発明は、複数台の誘導加熱装置を備えた厚鋼板の熱処理装置に適用することが可能である。図２に、複数台の誘導加熱装置を備えた厚鋼板の熱処理装置に本発明を適用した場合を示す。   The present invention can be applied to a steel plate heat treatment apparatus including a plurality of induction heating apparatuses. In FIG. 2, the case where this invention is applied to the heat processing apparatus of the thick steel plate provided with the several induction heating apparatus is shown.

図は誘導加熱装置１の下流側にのみ押し付けロール４を配置した場合を示すが、誘導加熱装置１の上流側、誘導加熱装置５，６の上流、下流側に押し付けロール４を配置することも可能である。   Although the figure shows the case where the pressing roll 4 is disposed only on the downstream side of the induction heating device 1, the pressing roll 4 may be disposed on the upstream side of the induction heating device 1, the upstream side of the induction heating devices 5 and 6, and the downstream side. Is possible.

本発明では、押付けロールは、駆動させてもさせなくてもよい。また、押付けロールと搬送ロールの間隔を厚鋼板の板厚よりも大きくしておき、厚鋼板の先端が押付けロールと搬送ロールの間を通過と同時に、押付けロールが厚鋼板に接するように押付ける運転手順にすることができる。   In the present invention, the pressing roll may or may not be driven. In addition, the distance between the pressing roll and the conveying roll is set to be larger than the thickness of the thick steel plate, and the leading end of the thick steel plate passes between the pressing roll and the conveying roll and is pressed so that the pressing roll contacts the thick steel plate. It can be a driving procedure.

尚、搬送ロール３を、厚鋼板より高い電気抵抗とすると、誘導電流ループが、厚鋼板２の内部にのみ形成され、厚鋼板２と搬送ロール３との間に空隙が生じても、スパークの発生が抑制される。   If the transport roll 3 has a higher electrical resistance than the thick steel plate, an induced current loop is formed only inside the thick steel plate 2, and even if a gap occurs between the thick steel plate 2 and the transport roll 3, Occurrence is suppressed.

搬送ロール３は少なくとも厚鋼板と接触するロール表面を炭素鋼より電気抵抗が高い材質、例えばステンレス鋼とするか、表面にステンレス鋼を肉盛溶接することが好ましい。   It is preferable that the transport roll 3 is made of a material having a higher electrical resistance than carbon steel, for example, stainless steel, at least in contact with the thick steel plate, or is overlay-welded with stainless steel on the surface.

ステンレス鋼としては、非磁性で誘導起電力が小さいオーステナイト系ステンレス鋼が望ましく、特に切削加工が容易で保守性に優れるＳＵＳ３０９の使用が好適である。耐食性が要求される場合はＳＵＳ３０３、ＳＵＳ３０４を使用する。ロール全体を上記材質の素材から加工してもよい。   As the stainless steel, austenitic stainless steel that is non-magnetic and has a small induced electromotive force is desirable. In particular, it is preferable to use SUS309 that is easy to cut and has excellent maintainability. When corrosion resistance is required, SUS303 and SUS304 are used. You may process the whole roll from the said raw material.

押し付けロール４は厚鋼板２との間に誘導電流ループを形成しないように厚鋼板２より電気抵抗を高くすることが望ましい。押し付けロール２と搬送ロール３は、鋼板の表裏面におけるスパーク発生抑制効果を同じとするために同一の電気抵抗値とすることが望ましい。   It is desirable that the pressing roll 4 has a higher electrical resistance than the thick steel plate 2 so as not to form an induced current loop with the thick steel plate 2. It is desirable that the pressing roll 2 and the conveying roll 3 have the same electric resistance value in order to make the spark generation suppressing effect on the front and back surfaces of the steel plate the same.

尚、誘導加熱装置より下流側となる最初の搬送ロールの電気抵抗を高くすれば良く、更に下流側の搬送ロールの電気抵抗を高くする必要はない。誘導加熱装置に厚鋼板が搬入される場合も、漏洩磁束が引き出される場合があるので、誘導加熱装置の入口に最も近い搬送ロールの電気抵抗を高くすることが望ましい。   Note that it is only necessary to increase the electrical resistance of the first transport roll on the downstream side of the induction heating device, and it is not necessary to further increase the electrical resistance of the downstream transport roll. Even when a thick steel plate is carried into the induction heating device, leakage magnetic flux may be drawn out, so it is desirable to increase the electrical resistance of the transport roll closest to the inlet of the induction heating device.

クラッド鋼板を誘導加熱する場合は、炭素鋼からなる母材を搬送ロールと接触させるとスパークの発生を防止することが可能となる。   When the clad steel plate is induction-heated, the occurrence of sparks can be prevented by bringing a base material made of carbon steel into contact with the transport roll.

Figure 2006348374
Figure 2006348374

Figure 2006348374
Figure 2006348374

図２に示す熱処理装置を用い、厚鋼板２の板厚は１２ｍｍとし、間隔ｅを２２５ｍｍにして押し付けロールを配置し、誘導加熱装置１で６０℃、誘導加熱装置５で３５℃、誘導加熱装置６で３５℃となる誘導加熱温度に設定して加熱する間、押し付けロールで厚鋼板を押付けて、加熱処理を行った。   Using the heat treatment apparatus shown in FIG. 2, the thickness of the thick steel plate 2 is 12 mm, the interval e is 225 mm, and a pressing roll is arranged, the induction heating apparatus 1 is 60 ° C., the induction heating apparatus 5 is 35 ° C., the induction heating apparatus During heating by setting the induction heating temperature to 35 ° C. in No. 6, the thick steel plate was pressed with a pressing roll to perform heat treatment.

一方、押付けロールを配置しないで同様な加熱処理を行った。前者の本発明例では、搬送トラブルなく安定して熱処理を行なうことができたが、後者の従来例では、一台目の誘導加熱装置を出た厚鋼板の先端が、二台目の誘導加熱装置に衝突し、搬送ができなくなったり、スパークが発生するなどのトラブルが約３０％発生した。   On the other hand, the same heat treatment was performed without arranging the pressing roll. In the former example of the present invention, heat treatment could be carried out stably without any trouble in transportation, but in the latter conventional example, the tip of the thick steel plate exiting from the first induction heating device was the second induction heating. About 30% of troubles occurred, such as collision with the equipment, inability to transport, and sparks.

本発明の一実施例を示す図。The figure which shows one Example of this invention. 本発明の他の実施例を示す図。The figure which shows the other Example of this invention. 厚鋼板の、誘導加熱装置を用いた熱処理設備の一例を示す図。The figure which shows an example of the heat processing equipment using the induction heating apparatus of a thick steel plate.

符号の説明Explanation of symbols

１、５、６ 誘導加熱装置
１ａ 上部誘導加熱コイル
１ｂ 下部誘導加熱コイル
２ 厚鋼板
３ 搬送ロール
４ 押し付けロール
７ 圧延機
８ 冷却装置
９ 誘導加熱装置
１０ ホットレベラー
１１ａ，１１ｂ出側端部 1, 5, 6 Induction heating device 1a Upper induction heating coil 1b Lower induction heating coil 2 Thick steel plate 3 Transport roll 4 Pressing roll 7 Rolling mill 8 Cooling device 9 Induction heating device 10 Hot levelers 11a and 11b outlet side

Claims (5)

厚鋼板を搬送する搬送ロール間に誘導加熱コイルを配置し、厚鋼板を前記誘導加熱コイル内を通過させながら誘導加熱する方法において、前記厚鋼板が通過する誘導加熱コイルの入側端部および出側端部から３００ｍｍ以内、または出側端部から３００ｍｍ以内に押し付けロールを配置し、厚鋼板を誘導加熱する間、誘導加熱コイルの出側に位置する押し付けロールで前記厚鋼板を上面側から押し付けることを特徴とする厚鋼板の誘導加熱方法。   In the method of placing an induction heating coil between conveyance rolls for conveying a thick steel plate and performing induction heating while passing the thick steel plate through the induction heating coil, an inlet end and an exit of the induction heating coil through which the thick steel plate passes are arranged. A pressing roll is arranged within 300 mm from the side end or within 300 mm from the exit end, and the steel plate is pressed from the upper surface side with a pressing roll positioned on the exit side of the induction heating coil while induction heating the steel plate. An induction heating method for a thick steel plate. 厚鋼板を４０℃以上誘導加熱する場合、厚鋼板を誘導加熱する間、該厚鋼板を押し付けることを特徴とする請求項１に記載の厚鋼板の誘導加熱方法。   The induction heating method for a thick steel plate according to claim 1, wherein when the thick steel plate is induction-heated at 40 ° C or more, the thick steel plate is pressed during the induction heating of the thick steel plate. 複数の前記搬送ロール間に、誘導加熱コイルを配置し、厚鋼板を前記誘導加熱コイル内を通過させながら厚鋼板を誘導加熱する方法において、前記厚鋼板を４０℃以上加熱する誘導加熱コイルの入側端部および出側端部、または出側端部から３００ｍｍ以内に押し付けロールを配置し、厚鋼板を誘導加熱する間、誘導加熱コイルの出側に位置する押し付けロールで前記厚鋼板を上面側から押し付けることを特徴とする厚鋼板の誘導加熱方法。   An induction heating coil is disposed between the plurality of transport rolls, and in the method of induction heating the thick steel plate while passing the thick steel plate through the induction heating coil, an induction heating coil for heating the thick steel plate by 40 ° C. or more is inserted. While the pressing roll is disposed within 300 mm from the side end and the exit end, or the exit end, and the steel plate is induction-heated, the steel plate is placed on the upper surface side by the pressing roll positioned on the exit side of the induction heating coil. An induction heating method for a thick steel plate, characterized by being pressed from above. 厚鋼板を搬送する搬送ロールと、前記搬送ロール間に配置される誘導加熱コイルと、前記誘導加熱コイルの入側端部および出側端部、または出側端部から３００ｍｍ以内、且つ搬送ロールの上方に、押し付けロールを配置したことを特徴とする厚鋼板の熱処理装置。   A transport roll for transporting a thick steel plate, an induction heating coil disposed between the transport rolls, an entrance end and an exit end of the induction heating coil, or within 300 mm from the exit end, and the transport roll A heat treatment apparatus for a thick steel plate, wherein a pressing roll is disposed above. 請求項４記載の厚鋼板の熱処理装置における搬送ロールは少なくとも表層がステンレス鋼で、押し付けロールは電気抵抗が厚鋼板より高いことを特徴とする厚鋼板の熱処理装置。   5. A heat treatment apparatus for thick steel sheets according to claim 4, wherein at least the surface layer of the transport roll in the heat treatment apparatus for thick steel sheets is stainless steel, and the pressing roll has an electric resistance higher than that of the thick steel sheets.
JP2005179535A 2005-06-20 2005-06-20 Heat treatment apparatus and method for thick steel plate Active JP4955940B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005179535A JP4955940B2 (en) 2005-06-20 2005-06-20 Heat treatment apparatus and method for thick steel plate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005179535A JP4955940B2 (en) 2005-06-20 2005-06-20 Heat treatment apparatus and method for thick steel plate

Publications (2)

Publication Number Publication Date
JP2006348374A true JP2006348374A (en) 2006-12-28
JP4955940B2 JP4955940B2 (en) 2012-06-20

Family

ID=37644515

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005179535A Active JP4955940B2 (en) 2005-06-20 2005-06-20 Heat treatment apparatus and method for thick steel plate

Country Status (1)

Country Link
JP (1) JP4955940B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105834673A (en) * 2015-01-12 2016-08-10 潘玉山 Curled lug production technique for small lifting lug plate spring
WO2018132053A1 (en) * 2017-01-11 2018-07-19 TCTECH Sweden AB (publ) Method and arrangement for producing a hardened sheet metal product

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003129130A (en) * 2001-10-18 2003-05-08 Nkk Corp Heat treatment equipment for thick steel plate

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003129130A (en) * 2001-10-18 2003-05-08 Nkk Corp Heat treatment equipment for thick steel plate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105834673A (en) * 2015-01-12 2016-08-10 潘玉山 Curled lug production technique for small lifting lug plate spring
WO2018132053A1 (en) * 2017-01-11 2018-07-19 TCTECH Sweden AB (publ) Method and arrangement for producing a hardened sheet metal product
CN110168115A (en) * 2017-01-11 2019-08-23 泰克瑞典公司 Method and apparatus for intermetallic composite coating
CN110168115B (en) * 2017-01-11 2021-05-04 泰克瑞典公司 Method and device for metal processing

Also Published As

Publication number Publication date
JP4955940B2 (en) 2012-06-20

Similar Documents

Publication Publication Date Title
KR20090115195A (en) Method of continuous annealing for steel strip with curie point and continuous annealing apparatus therefor
CN109844143A (en) Hot rolled plate annealing device, hot rolled plate method for annealing and the descaling method of the hot rolled steel plate containing Si
JP4955940B2 (en) Heat treatment apparatus and method for thick steel plate
EP2740808B1 (en) Method and apparatus for heating steel sheet
JP2011098393A (en) Device and method for heat treating thick steel plate, method of manufacturing steel plate and line for manufacturing it
JP5691231B2 (en) Cold rolling method
JP3925149B2 (en) Continuous heat treatment equipment for thick steel plates.
JP5044891B2 (en) Heat treatment equipment
TW200536942A (en) Heat treatment apparatus for steel plate and production line for steel plate equipped with the same
JP4457709B2 (en) Steel plate heat treatment equipment
JP3896110B2 (en) In-line soaking method for heated steel sheet
JP4714628B2 (en) Thick steel plate cooling equipment row and cooling method
JP2009256707A (en) Method and apparatus for cooling bar-like or tubular metallic material
JP6443411B2 (en) Steel slab joining method in continuous hot rolling
JP3640125B2 (en) Hot rolling equipment line and hot rolling strip rolling method
JP2015145528A (en) Vertical nitriding processing equipment and nitriding processing method for grain oriented silicon steel plate
JP5935541B2 (en) Manufacturing method of hot-rolled steel sheet
JP4691839B2 (en) Steel plate manufacturing method and steel plate manufacturing equipment
JP2006241537A (en) Heat treatment method for steel strip
JP3582517B2 (en) Manufacturing method of hot-rolled steel strip
JP2005279685A (en) Apron for hot-rolling line
JP3793508B2 (en) Hot rolling equipment
JP2005226106A (en) Method and device for heat-treating thick steel plate
JP3791368B2 (en) Hot-rolled steel strip rolling method
JP2003013134A (en) Manufacturing method for steel sheet, and facility therefor

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080423

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20100527

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20100608

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20100728

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20100824

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20101118

A911 Transfer to examiner for re-examination before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20101213

A912 Re-examination (zenchi) completed and case transferred to appeal board

Free format text: JAPANESE INTERMEDIATE CODE: A912

Effective date: 20110415

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120316

RD03 Notification of appointment of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7423

Effective date: 20120321

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 4955940

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150323

Year of fee payment: 3

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20120327

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250