JP2016062818A - Electric heating device of plated metal plate for hot stamp - Google Patents

Electric heating device of plated metal plate for hot stamp Download PDF

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JP2016062818A
JP2016062818A JP2014191283A JP2014191283A JP2016062818A JP 2016062818 A JP2016062818 A JP 2016062818A JP 2014191283 A JP2014191283 A JP 2014191283A JP 2014191283 A JP2014191283 A JP 2014191283A JP 2016062818 A JP2016062818 A JP 2016062818A
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metal plate
plated metal
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energization
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JP6424537B2 (en
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学 福本
Manabu Fukumoto
学 福本
晃大 仙石
Akihiro Sengoku
晃大 仙石
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Abstract

PROBLEM TO BE SOLVED: To provide an electric heating device of plated metal plate for hot stamp capable of reducing deviation of a plating layer, by reducing the Lorentz force acting on a molten plating layer compared with a conventional electric heating device.SOLUTION: An electric heating device 10 includes first and second auxiliary electrification plates 12, 13 having the same planar shape as that of a plated metal plate 11, a power supply 15 for electrifying the plated metal plate 11, and an adjust current supply unit (second power supply 16) for supplying a current, larger than 1/2 of the magnitude of a current flowing to the plated metal plate 11 and flowing reversely therefrom, to the first and second auxiliary electrification plates 12, 13, respectively. The first and second auxiliary electrification plates 12, 13 are arranged oppositely to the first and second surfaces of the plated metal plate 11, respectively, in parallel with the plated metal plate 11.SELECTED DRAWING: Figure 2A

Description

本発明は、ホットスタンプ用めっき金属板、たとえば、自動車用部品のめっき鋼板を通電加熱する装置に関する。   The present invention relates to an apparatus for energizing and heating a plated metal plate for hot stamping, for example, a plated steel plate for automobile parts.

高強度の金属板（たとえば、鋼板）を所望の形状に成形する方法の一つとして、ホットスタンプ法がある。ホットスタンプ法では、たとえば、金属板が鋼板である場合、鋼板をオーステナイト化温度（またはＡ３変態点）以上に加熱した状態でプレス成形する。金属板の加熱は、現在、炉を用いて行われることが多いが、より短時間で金属板を所望の温度に加熱し得る方法として、通電加熱が注目されている。   One method for forming a high-strength metal plate (for example, a steel plate) into a desired shape is a hot stamp method. In the hot stamping method, for example, when the metal plate is a steel plate, press forming is performed in a state where the steel plate is heated to an austenitizing temperature (or A3 transformation point) or higher. Currently, heating of a metal plate is often performed using a furnace, but current-carrying heating has attracted attention as a method for heating the metal plate to a desired temperature in a shorter time.

表面に低融点金属がめっきされた金属板、たとえば、Ａｌがめっきされた鋼板を、通電加熱すると、めっき金属が、特定の方向に移動することが知られている。具体的には、めっき金属の一部が、金属板の面内方向、かつ、金属板を流れる電流の方向に直交する方向に移動し、その結果、めっき層に薄い部分と厚い部分とが生じる。このようにめっき金属が移動する現象を、以下、「めっき層の寄り」ともいう。   It is known that when a surface of a metal plate having a low melting point metal plated, for example, a steel plate plated with Al is energized and heated, the plated metal moves in a specific direction. Specifically, a part of the plating metal moves in the in-plane direction of the metal plate and in a direction orthogonal to the direction of the current flowing through the metal plate, and as a result, a thin portion and a thick portion are generated in the plating layer. . Hereinafter, the phenomenon in which the plating metal moves is also referred to as “the proximity of the plating layer”.

めっき層の寄りが生じると、成形品の外観が損なわれ、また、めっき層厚が薄い部分では耐食性が低下する。めっき層の寄りは、加熱によりめっき層の融液が生じ、この融液に流れる電流によるローレンツ力が作用することにより生ずるものと考えられている。   When the plating layer is deviated, the appearance of the molded product is impaired, and the corrosion resistance is lowered at a portion where the plating layer is thin. It is considered that the shift of the plating layer is caused by the fact that a melt of the plating layer is generated by heating, and the Lorentz force due to the current flowing in the melt acts.

このようなめっき層の寄りを防止するため、種々の方法が提案されている。特許文献１では、めっき鋼鈑の電流が流れる方向に延びる側縁に対して絶縁間隙を挟んで延びる側縁を有する補助通電板を、めっき鋼鈑と同一平面内に並べ、めっき鋼鈑および補助通電板に同位相の電流を通電する装置が提案されている。この装置では、補助通電板に流れる電流によるローレンツ力で、金属板に流れる電流によるローレンツ力の少なくとも一部が打ち消される。   Various methods have been proposed to prevent such a shift of the plating layer. In Patent Literature 1, auxiliary current carrying plates having side edges extending across an insulating gap with respect to side edges extending in the direction in which the current flows in the plated steel sheet are arranged in the same plane as the plated steel sheet, There has been proposed a device for energizing a current plate with a current of the same phase. In this apparatus, at least a part of the Lorentz force due to the current flowing through the metal plate is canceled out by the Lorentz force due to the current flowing through the auxiliary energization plate.

また、特許文献２では、めっき鋼板の表面に直交する壁面を有する強磁性の磁束誘導体を、めっき鋼板の電流が流れる方向に延びる側面に沿って配置する装置が提案されている。めっき鋼板の側面と磁束誘導体の壁面との間には、絶縁間隙が設けられる。この装置では、磁束誘導体で金属板に流れる直流電流による磁界を制御することにより、ローレンツ力の少なくとも一部が打ち消される。   Patent Document 2 proposes an apparatus in which a ferromagnetic magnetic flux derivative having a wall surface orthogonal to the surface of a plated steel sheet is disposed along a side surface extending in the direction in which the current of the plated steel sheet flows. An insulating gap is provided between the side surface of the plated steel plate and the wall surface of the magnetic flux derivative. In this apparatus, at least a part of the Lorentz force is canceled by controlling the magnetic field generated by the direct current flowing through the metal plate with the magnetic flux derivative.

特許文献３には、ホットスタンプ用めっき金属板と同一形状の金属導体と、ホットスタンプ用めっき金属板とを、位置を揃えて平行に配置し、ホットスタンプ用めっき金属板と金属導体とを電気的に接続して通電することが提案されている。   In Patent Document 3, a metal conductor having the same shape as a hot stamping plating metal plate and a hot stamping plating metal plate are arranged in parallel at the same position, and the hot stamping plating metal plate and the metal conductor are electrically connected. It is proposed to connect and energize.

図１Ａに、特許文献３に開示された通電加熱装置での、めっき金属板と金属導体との電気的接続態様の一例を示し、図１Ｂに、その通電回路を示す。図１Ａおよび図１Ｂに示す態様は、特許文献３に開示された各種の態様の中では、めっき層の寄りを抑制する効果を最も大きくすることができると考えられる。   FIG. 1A shows an example of an electrical connection mode between a plated metal plate and a metal conductor in the energization heating apparatus disclosed in Patent Document 3, and FIG. 1B shows an energization circuit thereof. 1A and 1B are considered to be able to maximize the effect of suppressing the shift of the plating layer among the various aspects disclosed in Patent Document 3.

この通電加熱装置は、金属導体４Ａ、４Ｂを備えている。金属導体４Ａと金属導体４Ｂとは、互いに同じ形状（平面形状は、ホットスタンプ用素材１と同じ）を有し、互いに同じ材料からなる。したがって、金属導体４Ａと金属導体４Ｂとは、同じ電気抵抗を有する。   This energization heating device includes metal conductors 4A and 4B. The metal conductor 4A and the metal conductor 4B have the same shape (the planar shape is the same as that of the hot stamp material 1) and are made of the same material. Therefore, the metal conductor 4A and the metal conductor 4B have the same electrical resistance.

ホットスタンプ用素材（めっき金属板）１と金属導体４Ａ、４Ｂとは、位置を揃えて配置されている。金属導体４Ａ、４Ｂは、それぞれ、ホットスタンプ用素材１の表面と裏面とに、間隙をおいて対向されている。ホットスタンプ用素材１と金属導体４Ａとの間隔Ｌ１は、ホットスタンプ用素材１と金属導体４Ｂとの間隔Ｌ２に等しい。ホットスタンプ用素材１の両端と金属導体４Ａ、４Ｂの両端とには、給電部材２が電気的に接続されている。   The material for hot stamping (plated metal plate) 1 and the metal conductors 4A and 4B are arranged with their positions aligned. The metal conductors 4A and 4B are respectively opposed to the front and back surfaces of the hot stamp material 1 with a gap. The distance L1 between the hot stamp material 1 and the metal conductor 4A is equal to the distance L2 between the hot stamp material 1 and the metal conductor 4B. A power feeding member 2 is electrically connected to both ends of the hot stamping material 1 and both ends of the metal conductors 4A and 4B.

ホットスタンプ用素材１の端部、および金属導体４Ａ、４Ｂの端部には、給電部材２を介して、電源３が接続されている。電源３に対して、ホットスタンプ用素材１と金属導体４Ａ、４Ｂとは直列に接続されており、金属導体４Ａと金属導体４Ｂとは並列に接続されている。各金属導体４Ａ、４Ｂに流れる電流の向きは、ホットスタンプ用素材１に流れる電流の向きと逆であり、各金属導体４Ａ、４Ｂには、ホットスタンプ用素材１に流れる電流の１／２の電流が流れる。   A power source 3 is connected to the end portion of the hot stamp material 1 and the end portions of the metal conductors 4 </ b> A and 4 </ b> B via the power supply member 2. The hot stamp material 1 and the metal conductors 4A and 4B are connected in series to the power source 3, and the metal conductor 4A and the metal conductor 4B are connected in parallel. The direction of the current flowing through each of the metal conductors 4A and 4B is opposite to the direction of the current flowing through the hot stamp material 1, and each of the metal conductors 4A and 4B has ½ of the current flowing through the hot stamp material 1. Current flows.

特開２０１２−１１５８６４号公報JP 2012-115864 A 特開２０１２−１６６２４２号公報JP 2012-166242 A 特開２０１２−２２１７８４号公報JP 2012-221784 A

しかし、特許文献１および２の方法では、めっき層の寄りを抑制する効果は十分ではなく、特に、めっき鋼板の幅が広い場合は、補助通電板、または磁束誘導体を配置することによる効果は限定的なものとなる。   However, in the methods of Patent Documents 1 and 2, the effect of suppressing the shift of the plating layer is not sufficient, and in particular, when the width of the plated steel plate is wide, the effect by arranging the auxiliary energizing plate or the magnetic flux derivative is limited. It will be something like that.

特許文献３の装置を用いた場合は、金属板の幅が狭くなるほど、また、ホットスタンプ用素材と金属導体との間隔が大きくなるほど、ローレンツ力を抑制してめっき層の寄りを抑制する効果は低減する。   In the case of using the apparatus of Patent Document 3, the effect of suppressing the Lorentz force and suppressing the shift of the plating layer as the width of the metal plate is narrowed and the distance between the hot stamp material and the metal conductor is increased is To reduce.

そこで、本発明の目的は、ホットスタンプ用めっき金属板、特に、ホットスタンプ用めっき鋼板の通電加熱装置であって、従来の通電加熱装置よりも、溶融しためっき層に作用するローレンツ力を小さくして、めっき層の寄りを低減することができる通電加熱装置を提供することである。   Accordingly, an object of the present invention is an energization heating device for hot stamping plated metal plates, particularly hot stamping plated steel plates, and the Lorentz force acting on the molten plating layer is made smaller than that of a conventional energization heating device. And it is providing the electricity heating apparatus which can reduce the shift | offset | difference of a plating layer.

本発明は、下記通電加熱装置を要旨とする。
第１および第２端部を有するホットスタンプ用めっき金属板に通電して加熱する通電加熱装置であって、
前記めっき金属板と同じ平面形状を有し、前記めっき金属板の第１表面に対向されて前記めっき金属板に平行に配置される第１補助通電板であって、前記めっき金属板の前記第１および第２端部とそれぞれ位置を揃えて配置される第１および第２端部を有する第１補助通電板と、
前記めっき金属板と同じ平面形状を有し、前記めっき金属板の第２表面に対向されて前記めっき金属板に平行に配置される第２補助通電板であって、前記めっき金属板の前記第１および第２端部とそれぞれ位置を揃えて配置される第１および第２端部を有する第２補助通電板と、
前記めっき金属板の第１および第２端部、ならびに前記第１および第２補助通電板の各々の第１および第２端部に接続され、前記めっき金属板に電流を流すとともに、前記第１および第２補助通電板の各々に、前記めっき金属板に流れる電流の大きさの１／２より大きく前記めっき金属板に流れる電流と逆向きの電流を流すための電源装置とを備えた、ホットスタンプ用めっき金属板の通電加熱装置。 The gist of the present invention is as follows.
An energization heating device that energizes and heats a plated metal plate for hot stamping having first and second ends,
A first auxiliary energization plate having the same planar shape as the plated metal plate, opposed to the first surface of the plated metal plate and arranged in parallel to the plated metal plate, A first auxiliary energization plate having first and second ends arranged in alignment with the first and second ends, respectively;
A second auxiliary energizing plate having the same planar shape as the plated metal plate, facing the second surface of the plated metal plate and disposed in parallel to the plated metal plate, A second auxiliary energization plate having first and second ends arranged in alignment with the first and second ends, respectively;
The first and second end portions of the plated metal plate and the first and second end portions of the first and second auxiliary energizing plates, respectively, are used to pass current through the plated metal plate, and the first And a power supply device for supplying each of the second auxiliary energizing plates with a current larger than ½ of the current flowing in the plated metal plate and in a direction opposite to the current flowing in the plated metal plate, Electric heating device for stamped metal plate.

本発明の通電加熱装置によれば、ホットスタンプ用めっき金属板に通電して加熱する際、従来の通電加熱装置を用いた場合に比して、溶融しためっき層が一方向に移動する現象（めっき層の寄り）を抑制することができる。その結果、ホットスタンプにより得られる成型品の表面性状を良好なものとすることができる。   According to the current heating device of the present invention, when a hot stamped plated metal plate is heated by heating, the molten plating layer moves in one direction as compared to the case where a conventional current heating device is used ( (Close to the plating layer) can be suppressed. As a result, the surface property of the molded product obtained by hot stamping can be improved.

図１Ａは、従来の通電加熱装置を用いた場合のホットスタンプ用素材および金属導体の電気的接続態様を示す図である。FIG. 1A is a diagram showing an electrical connection mode of a hot stamp material and a metal conductor when a conventional energization heating apparatus is used. 図１Ｂは、図１Ａに示すホットスタンプ用素材および金属導体の通電回路を示す図である。FIG. 1B is a diagram showing a hot stamping material and a metal conductor energization circuit shown in FIG. 1A. 図２Ａは、本発明の第１の実施形態に係る通電加熱装置の構成を示す図である。FIG. 2A is a diagram showing a configuration of an electric heating device according to the first embodiment of the present invention. 図２Ｂは、本発明の第１の実施形態の変形例に係る通電加熱装置の構成を示す図である。FIG. 2B is a diagram showing a configuration of an energization heating device according to a modification of the first embodiment of the present invention. 図３Ａは、本発明の第２の実施形態に係る通電加熱装置の構成を示す図である。FIG. 3A is a diagram showing a configuration of an electric heating device according to the second embodiment of the present invention. 図３Ｂは、本発明の第２の実施形態に係る通電加熱装置の変形例の構成を示す図である。FIG. 3B is a diagram showing a configuration of a modified example of the electric heating device according to the second embodiment of the present invention. 図４は、めっき金属板の幅方向に関して、めっき金属板の中央からの距離と、その位置で生じるローレンツ力の大きさとの関係を示す図である。FIG. 4 is a diagram showing the relationship between the distance from the center of the plated metal plate and the magnitude of the Lorentz force generated at that position in the width direction of the plated metal plate.

図１Ａおよび図１Ｂを参照して、特許文献３の通電加熱装置を用いた場合は、金属導体４Ａ、４Ｂの各々に流れる電流の大きさは、ホットスタンプ用素材１に流れる電流の大きさの１／２に固定される。本発明者らは、このような制約を取り除き、金属導体４Ａ、４Ｂの各々に流れる電流の大きさを、ホットスタンプ用素材１に流れる電流の大きさの１／２より大きくすることを可能とすれば、ローレンツ力を抑制する効果が、より大きくなることを知見した。本発明は、このような知見に基づいて完成したものである。   Referring to FIGS. 1A and 1B, when the current heating device of Patent Document 3 is used, the magnitude of the current flowing through each of the metal conductors 4A and 4B is the magnitude of the current flowing through the hot stamping material 1. Fixed to 1/2. The present inventors can remove such restrictions and make the magnitude of the current flowing through each of the metal conductors 4A and 4B larger than ½ of the magnitude of the current flowing through the hot stamping material 1. Then, it has been found that the effect of suppressing the Lorentz force becomes larger. The present invention has been completed based on such findings.

本発明の通電加熱装置は、上述のように、第１および第２端部を有するホットスタンプ用めっき金属板に通電して加熱するためのものである。この通電加熱装置は、第１補助通電板と、第２補助通電板と、電源装置とを備えている。第１補助通電板は、めっき金属板と同じ平面形状を有し、めっき金属板の第１表面に対向されてめっき金属板に平行に配置される。第１補助通電板は、めっき金属板の第１および第２端部とそれぞれ位置を揃えて配置される第１および第２端部を有する。第２補助通電板は、めっき金属板と同じ平面形状を有し、めっき金属板の第２表面に対向されてめっき金属板に平行に配置される。第２補助通電板は、めっき金属板の第１および第２端部とそれぞれ位置を揃えて配置される第１および第２端部を有する。電源装置は、めっき金属板の第１および第２端部、ならびに第１および第２補助通電板の各々の第１および第２端部に接続され、めっき金属板に電流を流すとともに、第１および第２補助通電板の各々に、めっき金属板に流れる電流の大きさの１／２より大きくめっき金属板に流れる電流と逆向きの電流を流すための電源装置とを備えている。   As described above, the energization heating apparatus of the present invention is for energizing and heating a hot stamping plated metal plate having first and second ends. This energization heating device includes a first auxiliary energization plate, a second auxiliary energization plate, and a power supply device. The first auxiliary energizing plate has the same planar shape as the plated metal plate, and is disposed in parallel to the plated metal plate so as to face the first surface of the plated metal plate. The first auxiliary energizing plate has first and second ends that are arranged in alignment with the first and second ends of the plated metal plate, respectively. The second auxiliary energizing plate has the same planar shape as the plated metal plate, and is disposed in parallel to the plated metal plate so as to face the second surface of the plated metal plate. The second auxiliary energization plate has first and second ends that are arranged in alignment with the first and second ends of the plated metal plate, respectively. The power supply device is connected to the first and second end portions of the plated metal plate and the first and second end portions of each of the first and second auxiliary energizing plates, and allows current to flow through the plated metal plate and Each of the second auxiliary energizing plates is provided with a power supply device for causing a current flowing in the direction opposite to the current flowing in the plated metal plate to be larger than ½ of the magnitude of the current flowing in the plated metal plate.

めっき金属板において、０．１ＭＮ／ｍ3以下のローレンツ力が作用する部分では、通常、溶融しためっき層の移動は生じない。本発明の通電加熱装置によれば、めっき金属板に流れる電流の大きさに対する、第１および第２補助通電板に流れる電流の大きさの比を適切なものとすることにより、めっき金属板の側部領域を除く広い領域について、その領域内の各部に作用するローレンツ力を０．１ＭＮ／ｍ3以下にすることができる。この領域は、めっき金属板の幅方向に関して、たとえば、当該幅の９０％の領域である。 In the plated metal plate, the molten plated layer does not normally move at a portion where a Lorentz force of 0.1 MN / m 3 or less acts. According to the energization heating device of the present invention, the ratio of the magnitude of the current flowing in the first and second auxiliary energization plates to the magnitude of the current flowing in the plated metal plate is made appropriate, so that For a wide area excluding the side area, the Lorentz force acting on each part in the area can be 0.1 MN / m 3 or less. This area is, for example, an area of 90% of the width in the width direction of the plated metal plate.

めっき金属板の側部（電流が流れる方向に直交する方向の縁部）は、めっき層の寄り等により品質が良好ではない場合は、トリミングにより除去することができる。本発明の通電加熱装置により、そのような除去する領域を少なくすることができる。   The side of the plated metal plate (the edge in the direction orthogonal to the direction in which the current flows) can be removed by trimming if the quality is not good due to the proximity of the plated layer or the like. Such an area to be removed can be reduced by the electric heating apparatus of the present invention.

以下、図面を参照して、本発明の通電加熱装置の実施形態について具体的に説明する。
図２Ａは、本発明の第１の実施形態に係る通電加熱装置の構成を示す図である。 Hereinafter, with reference to the drawings, embodiments of the current heating device of the present invention will be described in detail.
FIG. 2A is a diagram showing a configuration of an electric heating device according to the first embodiment of the present invention.

この通電加熱装置１０は、めっき金属板１１をホットスタンプ加工するに際して、めっき金属板１１に通電して加熱するためのものである。通電加熱装置１０は、第１および第２補助通電板１２、１３を備えている。第１補助通電板１２は、めっき金属板１１の第１表面（図２Ａにおいて上面）に対向されてめっき金属板１１に平行に配置される。第２補助通電板１３は、めっき金属板１１の第２表面（図２Ａにおいて下面）に対向されてめっき金属板１１に平行に配置される。   The energization heating apparatus 10 is for energizing and heating the plated metal plate 11 when hot stamping the plated metal plate 11. The energization heating apparatus 10 includes first and second auxiliary energization plates 12 and 13. The first auxiliary energizing plate 12 is disposed in parallel to the plated metal plate 11 so as to face the first surface (the upper surface in FIG. 2A) of the plated metal plate 11. The second auxiliary energizing plate 13 is disposed in parallel to the plated metal plate 11 so as to face the second surface (the lower surface in FIG. 2A) of the plated metal plate 11.

めっき金属板１１は、たとえば、表面に低融点金属（Ａｌ、Ｚｎ、Ｓｎ等）がめっきされた鋼板であってもよい。これらの低融点金属は、ホットスタンプを行うに際しての加熱により、液相を生ずる。第１および第２補助通電板１２、１３は、熱伝導が大きい材料からなることが好ましく、たとえば、銅または銅合金からなる。   The plated metal plate 11 may be, for example, a steel plate whose surface is plated with a low melting point metal (Al, Zn, Sn, etc.). These low-melting-point metals generate a liquid phase by heating during hot stamping. The first and second auxiliary energization plates 12 and 13 are preferably made of a material having high heat conduction, and are made of, for example, copper or a copper alloy.

めっき金属板１１ならびに第１および第２補助通電板１２、１３は、いずれも板状であり、これらを垂直に見て、第１および第２補助通電板１２、１３の各々は、めっき金属板１１と、実質的に同じ平面形状（この実施形態では、矩形）および大きさを有する。   The plated metal plate 11 and the first and second auxiliary energizing plates 12 and 13 are both plate-shaped, and when viewed vertically, each of the first and second auxiliary energizing plates 12 and 13 is a plated metal plate. 11 and substantially the same planar shape (in this embodiment, a rectangle) and size.

通電加熱装置１０は、めっき金属板１１ならびに第１および第２補助通電板１２、１３の各々の長手方向両端部にそれぞれ取り付けられる給電部材１４を備えている。給電部材１４は、導電性を有する。以下、めっき金属板１１ならびに第１および第２補助通電板１２、１３のそれぞれについて、長手方向の同じ一方側（図２Ａで右側）の端部を「第１端部」といい、他方側（図２Ａで左側）の端部を「第２端部」という。   The energization heating device 10 includes a power supply member 14 attached to each end portion in the longitudinal direction of each of the plated metal plate 11 and the first and second auxiliary energization plates 12 and 13. The power supply member 14 has conductivity. Hereinafter, for each of the plated metal plate 11 and the first and second auxiliary energizing plates 12 and 13, the end portion on the same side in the longitudinal direction (right side in FIG. 2A) is referred to as “first end portion”, and the other side ( The end portion on the left side in FIG. 2A is referred to as a “second end portion”.

めっき金属板１１の第１端部に取り付けられた給電部材１４には、非磁性絶縁体を介して、第１補助通電板１２の第１端部に取り付けられた給電部材１４と、第２補助通電板１３の第１端部に取り付けられた給電部材１４とが重ねられる。また、めっき金属板１１の第２端部に取り付けられた給電部材１４には、非磁性絶縁体を介して、第１補助通電板１２の第２端部に取り付けられた給電部材１４と、第２補助通電板１３の第２端部に取り付けられた給電部材１４とが重ねられる。   The power supply member 14 attached to the first end of the plated metal plate 11 includes a power supply member 14 attached to the first end of the first auxiliary energization plate 12 and a second auxiliary member via a nonmagnetic insulator. The power supply member 14 attached to the first end of the current supply plate 13 is overlapped. In addition, the power supply member 14 attached to the second end of the plated metal plate 11 includes a power supply member 14 attached to the second end of the first auxiliary energization plate 12 via a nonmagnetic insulator, and 2 The power feeding member 14 attached to the second end portion of the auxiliary energizing plate 13 is overlapped.

これにより、めっき金属板１１の第１および第２端部に対して、それぞれ、第１補助通電板１２の第１および第２端部が位置を揃えて配置されるとともに、第２補助通電板１３の第１および第２端部が位置を揃えて配置される。また、めっき金属板１１と第１補助通電板１２との間隔は、めっき金属板１１と第２補助通電板１３との間隔に等しくなる。   As a result, the first and second end portions of the first auxiliary energizing plate 12 are arranged in alignment with the first and second end portions of the plated metal plate 11, respectively, and the second auxiliary energizing plate is arranged. Thirteen first and second end portions are arranged at the same position. Further, the interval between the plated metal plate 11 and the first auxiliary energizing plate 12 is equal to the interval between the plated metal plate 11 and the second auxiliary energizing plate 13.

通電加熱装置１０は、給電部材１４を介してめっき金属板１１に直流電流を流すための第１電源１５と、給電部材１４を介して第１および第２補助通電板１２、１３の各々に直流電流を流すための第２電源１６とを含む。   The energization heating apparatus 10 includes a first power source 15 for flowing a direct current through the plated metal plate 11 via the power supply member 14, and a direct current to each of the first and second auxiliary current supply plates 12 and 13 via the power supply member 14. And a second power source 16 for flowing current.

第２電源１６は、第１および第２出力端子１６ａ、１６ｂを含む。第１出力端子１６ａは、第１補助通電板１２の第１端部と、第２補助通電板１３の第１端部とに接続されており、第２出力端子１６ｂは、第１補助通電板１２の第２端部と、第２補助通電板１３の第２端部とに接続されている。すなわち、第１補助通電板１２と第２補助通電板１３とは、第２電源１６に対して並列に接続されている。また、第１補助通電板１２と第２補助通電板１３とは、互いに実質的に同じ大きさの電気抵抗を有する。このため、第２電源１６により第１および第２補助通電板１２、１３に電圧を印加すると、第１補助通電板１２に流れる電流の大きさと第２補助通電板１３に流れる電流の大きさとは、実質的に同じになる。第２電源１６は、第１電源１５によりめっき金属板１１に流される電流と逆向きの電流を、第１および第２補助通電板１２、１３の各々に流す。   The second power supply 16 includes first and second output terminals 16a and 16b. The first output terminal 16a is connected to the first end of the first auxiliary energization plate 12 and the first end of the second auxiliary energization plate 13, and the second output terminal 16b is connected to the first auxiliary energization plate. 12 is connected to the second end of the second auxiliary energizing plate 13. That is, the first auxiliary energizing plate 12 and the second auxiliary energizing plate 13 are connected in parallel to the second power supply 16. The first auxiliary energization plate 12 and the second auxiliary energization plate 13 have substantially the same electrical resistance. For this reason, when a voltage is applied to the first and second auxiliary energization plates 12 and 13 by the second power source 16, the magnitude of the current flowing through the first auxiliary energization plate 12 and the magnitude of the current flowing through the second auxiliary energization plate 13 are as follows. , Become substantially the same. The second power supply 16 allows a current in the direction opposite to the current flowing through the plated metal plate 11 from the first power supply 15 to flow through each of the first and second auxiliary energizing plates 12 and 13.

第１電源１５の出力電圧は可変であり、これにより、めっき金属板１１に流れる直流電流の大きさを調整することができる。同様に、第２電源１６の出力電圧は可変であり、これにより、第１および第２補助通電板１２、１３に流れる直流電流の大きさを調整することができる。第１電源１５により、めっき金属板１１に第１および第２端部を介して流される電流の大きさをＩ1とすると、第２電源１６は、大きさＩ2が１／２×Ｉ1より大きな電流を、第１および第２補助通電板１２、１３の各々に第１および第２端部を介して流すことができる。 The output voltage of the first power supply 15 is variable, whereby the magnitude of the direct current flowing through the plated metal plate 11 can be adjusted. Similarly, the output voltage of the second power supply 16 is variable, whereby the magnitude of the direct current flowing through the first and second auxiliary energization plates 12 and 13 can be adjusted. When the magnitude of the current flowing through the plated metal plate 11 through the first and second ends by the first power supply 15 is I 1 , the second power supply 16 has a magnitude I 2 of 1/2 × I 1. A larger current can be passed through each of the first and second auxiliary energization plates 12 and 13 via the first and second ends.

めっき金属板１１を通電加熱する際は、まず、めっき金属板１１ならびに第１および第２補助通電板１２、１３が上述のように配置され、これらに対して、第１および第２電源１５、１６が上述のように接続された状態とする。第１および第２補助通電板１２、１３ならびにめっき金属板１１の変形（たとえば、撓み）により、これらのうち隣接するものが接触しないように、第１および第２補助通電板１２、１３の各々は、めっき金属板１１と、１ｍｍ以上の間隔をあけて配置されることが好ましい。   When the plated metal plate 11 is energized and heated, first, the plated metal plate 11 and the first and second auxiliary energized plates 12 and 13 are arranged as described above. 16 is connected as described above. Each of the first and second auxiliary energizing plates 12, 13 is prevented from contacting adjacent ones of the first and second auxiliary energizing plates 12, 13 and the plated metal plate 11 (for example, by bending). Is preferably arranged at a distance of 1 mm or more from the plated metal plate 11.

そして、第１電源１５により、めっき金属板１１に直流電流Ｉ1を流すとともに、第２電源１６により、第１および第２補助通電板１２、１３の各々に、直流電流Ｉ2を流す。第１および第２補助通電板１２、１３を流れる電流の向きは、めっき金属板１１を流れる電流の向きと逆になるようにする。図２Ａに、電流の向きの例を、矢印で示す。また、第１および第２補助通電板１２、１３の各々を流れる電流の大きさＩ2は、めっき金属板１１を流れる電流の大きさＩ1の１／２より大きくなるようにする。 Then, a direct current I 1 is passed through the plated metal plate 11 by the first power source 15, and a direct current I 2 is passed through each of the first and second auxiliary energizing plates 12 and 13 by the second power source 16. The direction of the current flowing through the first and second auxiliary energizing plates 12 and 13 is set to be opposite to the direction of the current flowing through the plated metal plate 11. In FIG. 2A, an example of the direction of current is indicated by an arrow. Further, the magnitude I 2 of the current flowing through each of the first and second auxiliary energizing plates 12 and 13 is set to be larger than ½ of the magnitude I 1 of the current flowing through the plated metal plate 11.

第１および第２補助通電板１２、１３の各々を流れる電流の大きさＩ2を適切に選択することにより、Ｉ2＝１／２×Ｉ1とした場合に比して、めっき金属板１１に流れる電流によって生じる磁場によりめっき金属板１１に生じるローレンツ力を、第１および第２補助通電板１２、１３に流れる電流によって生じる磁場により、低減することができる。これにより、めっき金属板１１に通電加熱することにより、めっき層が溶融しても、その融液に作用するローレンツ力を抑制し、その融液の移動を抑制することができる。したがって、この通電加熱装置１０を用いた通電加熱により、従来の通電加熱装置を用いた場合に比して、めっき層の寄りを抑制することができる。 By appropriately selecting the magnitude I 2 of the current flowing through each of the first and second auxiliary energizing plates 12 and 13, the plated metal plate 11 can be compared with the case where I 2 = 1/2 × I 1. The Lorentz force generated in the plated metal plate 11 by the magnetic field generated by the current flowing through the first and second auxiliary energization plates 12 and 13 can be reduced by the magnetic field generated by the current flowing through the first and second auxiliary energizing plates 12 and 13. Thereby, even if a plating layer melts by energizing and heating the plated metal plate 11, the Lorentz force acting on the melt can be suppressed, and the movement of the melt can be suppressed. Therefore, the energization heating using the energization heating device 10 can suppress the deviation of the plating layer as compared with the case where the conventional energization heating device is used.

第１および第２補助通電板１２、１３は、めっき金属板１１と同じ平面形状および大きさを有するので、めっき金属板１１と第１および第２補助通電板１２、１３との間隔、および、この間隔に応じた第１および第２補助通電板１２、１３への通電量を、それぞれ適切に設定した場合、めっき層の寄りを抑制する効果は、めっき金属板１１の幅が広い場合でも、めっき金属板１１の大部分の領域に及ぶ。   Since the first and second auxiliary energizing plates 12, 13 have the same planar shape and size as the plated metal plate 11, the distance between the plated metal plate 11 and the first and second auxiliary energizing plates 12, 13, and When the energization amount to the first and second auxiliary energization plates 12 and 13 according to this interval is appropriately set, the effect of suppressing the shift of the plating layer is effective even when the plated metal plate 11 is wide. It covers the most area of the plated metal plate 11.

図２Ｂは、本発明の第１の実施形態の変形例に係る通電加熱装置の構成を示す図である。図２Ｂにおいて、図２Ａに示す構成要素に対応する構成要素には、図２Ａと同じ参照符号を付して説明を省略する。   FIG. 2B is a diagram showing a configuration of an energization heating device according to a modification of the first embodiment of the present invention. In FIG. 2B, constituent elements corresponding to those shown in FIG. 2A are given the same reference numerals as in FIG.

この通電加熱装置２０は、図２Ａに示す通電加熱装置１０の第１および第２電源１５、１６の代わりに、それぞれ、第１および第２電源２５、２６を備えている。第２電源２６は、第１および第２出力端子２６ａ、２６ｂを含む。第１出力端子２６ａは、第１補助通電板１２の第１端部と、第２補助通電板１３の第１端部とに接続されており、第２出力端子２６ｂは、第１補助通電板１２の第２端部と、第２補助通電板１３の第２端部とに接続されている。   The electric heating device 20 includes first and second power sources 25 and 26, respectively, instead of the first and second power sources 15 and 16 of the electric heating device 10 shown in FIG. 2A. The second power supply 26 includes first and second output terminals 26a and 26b. The first output terminal 26a is connected to the first end of the first auxiliary energization plate 12 and the first end of the second auxiliary energization plate 13, and the second output terminal 26b is the first auxiliary energization plate. 12 is connected to the second end of the second auxiliary energizing plate 13.

第１および第２電源２５、２６は、いずれも、互いに同じ周波数の交流電圧を発生する。第１電源２５により、めっき金属板１１に交流電流を流すことができる。第２電源２６は、第１電源２５によってめっき金属板１１に流される電流（大きさがＩ1）と同じ周波数を有し、大きさＩ2が１／２×Ｉ1より大きい交流電流を、第１および第２補助通電板１２、１３の各々に流すことが可能である。図２Ｂには、ある瞬間における電流の向きを矢印で示す。 Both the first and second power sources 25 and 26 generate AC voltages having the same frequency. An alternating current can be passed through the plated metal plate 11 by the first power supply 25. The second power source 26 has an alternating current having the same frequency as the current (the magnitude is I 1 ) that is passed through the plated metal plate 11 by the first power source 25 and the magnitude I 2 is greater than ½ × I 1 . It is possible to flow through each of the first and second auxiliary energization plates 12 and 13. In FIG. 2B, the direction of current at a certain moment is indicated by an arrow.

通電加熱装置２０は、同期装置２７を備えている。同期装置２７は、めっき金属板１１に流れる交流電流と第１および第２補助通電板１２、１３を流れる交流電流とを逆位相になるように同期させる。   The energization heating device 20 includes a synchronization device 27. The synchronizing device 27 synchronizes the alternating current flowing through the plated metal plate 11 and the alternating current flowing through the first and second auxiliary energizing plates 12 and 13 so as to be in opposite phases.

同期装置２７によって、このように同期を行うと、めっき金属板１１を流れる電流の向きと、第１および第２補助通電板１２、１３の各々を流れる電流の向きとは、常に逆になるので、図２Ａに示す実施形態の場合と同様に、めっき金属板１１の通電加熱により生じる融液に作用するローレンツ力を抑制し、その融液の移動を抑制することができる。   When synchronization is performed in this way by the synchronization device 27, the direction of the current flowing through the plated metal plate 11 and the direction of the current flowing through each of the first and second auxiliary energizing plates 12 and 13 are always opposite. As in the case of the embodiment shown in FIG. 2A, the Lorentz force acting on the melt generated by energization heating of the plated metal plate 11 can be suppressed, and the movement of the melt can be suppressed.

図３Ａは、本発明の第２の実施形態に係る通電加熱装置の構成を示す図である。図３Ａにおいて、図２Ａに示す構成要素に対応する構成要素には、図２Ａと同じ参照符号を付して説明を省略する。   FIG. 3A is a diagram showing a configuration of an electric heating device according to the second embodiment of the present invention. In FIG. 3A, components corresponding to those shown in FIG. 2A are given the same reference numerals as in FIG.

この通電加熱装置３０は、１対の出力端子である第１および第２端子３５ａ、３５ｂを有する電源３５と、第１および第２回路３７、３８とを備えている。電源３５は、直流電圧を発生するものであってもよく、交流電圧を発生するものであってもよい。第１および第２回路３７、３８は、電源３５に対して、めっき金属板１１と、第１補助通電板１２と、第２補助通電板１３とを並列に接続する回路を形成する。   The energization heating device 30 includes a power source 35 having first and second terminals 35a and 35b as a pair of output terminals, and first and second circuits 37 and 38. The power source 35 may generate a DC voltage or an AC voltage. The first and second circuits 37 and 38 form a circuit that connects the plated metal plate 11, the first auxiliary energizing plate 12, and the second auxiliary energizing plate 13 in parallel to the power supply 35.

第１回路３７は、電源３５の第１出力端子３５ａと、めっき金属板１１の第１端部、第１補助通電板１２の第２端部、および第２補助通電板１３の第２端部とを電気的に接続する。第１回路３７は、電源３５の第１出力端子３５ａとめっき金属板１１の第１端部とを接続し第１分岐点Ｐ１が設けられた導電経路と、第１補助通電板１２の第２端部と第２補助通電板１３の第２端部とを接続し第２分岐点Ｐ２が設けられた導電経路と、第１分岐点Ｐ１と第２分岐点Ｐ２とを接続する導電経路とを含む。   The first circuit 37 includes a first output terminal 35 a of the power source 35, a first end of the plated metal plate 11, a second end of the first auxiliary energizing plate 12, and a second end of the second auxiliary energizing plate 13. And electrically connect. The first circuit 37 connects the first output terminal 35 a of the power source 35 and the first end of the plated metal plate 11, and the conductive path provided with the first branch point P <b> 1 and the second of the first auxiliary energizing plate 12. A conductive path connecting the end and the second end of the second auxiliary energizing plate 13 to provide the second branch point P2, and a conductive path connecting the first branch point P1 and the second branch point P2. Including.

第２回路３８は、電源３５の第２出力端子３５ｂと、めっき金属板１１の第２端部、第１補助通電板１２の第１端部、および第２補助通電板１３の第１端部とを電気的に接続する。第２回路３８は、電源３５の第２出力端子３５ｂとめっき金属板１１の第２端部とを接続し第３分岐点Ｐ３が設けられた導電経路と、第１補助通電板１２の第１端部と第２補助通電板１３の第１端部とを接続し第４分岐点Ｐ４が設けられた導電経路と、第３分岐点Ｐ３と第４分岐点Ｐ４とを接続する導電経路とを含む。   The second circuit 38 includes a second output terminal 35 b of the power source 35, a second end of the plated metal plate 11, a first end of the first auxiliary energizing plate 12, and a first end of the second auxiliary energizing plate 13. And electrically connect. The second circuit 38 connects the second output terminal 35b of the power source 35 and the second end of the plated metal plate 11 and has a conductive path provided with a third branch point P3, and a first of the first auxiliary energizing plate 12. A conductive path connecting the end and the first end of the second auxiliary energizing plate 13 to provide the fourth branch point P4; and a conductive path connecting the third branch point P3 and the fourth branch point P4. Including.

第１分岐点Ｐ１と第２分岐点Ｐ２との間の導電経路、および第３分岐点Ｐ３と第４分岐点Ｐ４との間の導電経路には、第１可変抵抗器Ｒ１１、Ｒ１２が、それぞれ介装されている。第１分岐点Ｐ１とめっき金属板１１の第１端部との間の導電経路、および第３分岐点Ｐ３とめっき金属板１１の第２端部との間の導電経路には、第２可変抵抗器Ｒ２１、Ｒ２２が、それぞれ介装されている。   In the conductive path between the first branch point P1 and the second branch point P2, and the conductive path between the third branch point P3 and the fourth branch point P4, the first variable resistors R11 and R12 are respectively It is intervened. The conductive path between the first branch point P1 and the first end of the plated metal plate 11 and the conductive path between the third branch point P3 and the second end of the plated metal plate 11 are second variable. Resistors R21 and R22 are respectively interposed.

第１可変抵抗器Ｒ１１および第１可変抵抗器Ｒ１２の少なくとも一方の抵抗値を大きくすると、第１および第２補助通電板１２、１３の各々に流れる電流の大きさＩ2が小さくなる。第２可変抵抗器Ｒ２１および第２可変抵抗器Ｒ２２の少なくとも一方の抵抗値を大きくすると、めっき金属板１１に流れる電流の大きさＩ1が小さくなる。すなわち、第１可変抵抗器Ｒ１１、Ｒ１２および第２可変抵抗器Ｒ２１、Ｒ２２の抵抗値を調整（いずれかの可変抵抗器の抵抗値をゼロにする場合を含む。）することにより、これらの電流の大きさＩ1、Ｉ2を調整することができる。 When the resistance value of at least one of the first variable resistor R11 and the first variable resistor R12 is increased, the magnitude I 2 of the current flowing through each of the first and second auxiliary energizing plates 12 and 13 is decreased. When the resistance value of at least one of the second variable resistor R21 and the second variable resistor R22 is increased, the magnitude I 1 of the current flowing through the plated metal plate 11 is decreased. That is, by adjusting the resistance values of the first variable resistors R11 and R12 and the second variable resistors R21 and R22 (including the case where the resistance value of any of the variable resistors is zero), these currents are obtained. The magnitudes I 1 and I 2 can be adjusted.

この実施形態では、電源３５が、直流電圧を発生するものである場合および交流電圧を発生するものである場合のいずれであっても、第１および第２補助通電板１２、１３の各々を流れる電流の向きは、常に、めっき金属板１１を流れる電流の向きと逆になる。また、第１可変抵抗器Ｒ１１、Ｒ１２および第２可変抵抗器Ｒ２１、Ｒ２２それぞれの抵抗値を適切に調整することにより、第１および第２補助通電板１２、１３の各々を流れる電流の大きさＩ2が、めっき金属板１１を流れる電流の大きさＩ1の１／２より大きくなるようにすることができる。 In this embodiment, the power source 35 flows through each of the first and second auxiliary energizing plates 12 and 13 regardless of whether the power source 35 generates a DC voltage or an AC voltage. The direction of the current is always opposite to the direction of the current flowing through the plated metal plate 11. Further, by appropriately adjusting the resistance values of the first variable resistors R11 and R12 and the second variable resistors R21 and R22, the magnitude of the current flowing through each of the first and second auxiliary energization plates 12 and 13 is adjusted. I 2 can be made larger than ½ of the magnitude I 1 of the current flowing through the plated metal plate 11.

したがって、この状態で、図２Ａに示す実施形態の場合と同様に、めっき金属板１１の通電加熱により生じる融液に作用するローレンツ力を抑制し、その融液の移動を抑制することができる。   Therefore, in this state, as in the case of the embodiment shown in FIG. 2A, the Lorentz force acting on the melt generated by energization heating of the plated metal plate 11 can be suppressed, and the movement of the melt can be suppressed.

めっき金属板１１の通電加熱により生じる融液に作用するローレンツ力は、たとえば、下記パラメータにより変化する。
(i) めっき金属板１１と第１補助通電板１２との間隔、およびめっき金属板１１と第２補助通電板１３との間隔
(ii) めっき金属板１１、ならびに第１および第２補助通電板１２、１３それぞれの板厚
(iii) 第１および第２補助通電板１２、１３の材質 The Lorentz force acting on the melt generated by energization heating of the plated metal plate 11 varies depending on, for example, the following parameters.
(i) The interval between the plated metal plate 11 and the first auxiliary energizing plate 12 and the interval between the plated metal plate 11 and the second auxiliary energizing plate 13
(ii) Plated metal plate 11 and the thicknesses of the first and second auxiliary energizing plates 12 and 13
(iii) Material of the first and second auxiliary energizing plates 12 and 13

このようなパラメータに応じて、融液全体についてローレンツ力が最小になるように、めっき金属板１１に流れる電流の大きさＩ1、ならびに第１および第２補助通電板１２、１３に流れる電流の大きさＩ2を最適化することが好ましい。第１可変抵抗器Ｒ１１、Ｒ１２および第２可変抵抗器Ｒ２１、Ｒ２２それぞれの抵抗値を調整することにより、このような最適な電流の大きさＩ1、Ｉ2を実現することができる。 In accordance with such parameters, the magnitude of the current I 1 flowing through the plated metal plate 11 and the current flowing through the first and second auxiliary energizing plates 12 and 13 so that the Lorentz force is minimized for the entire melt. it is preferable to optimize the size of I 2. By adjusting the resistance values of the first variable resistors R11 and R12 and the second variable resistors R21 and R22, such optimum current magnitudes I 1 and I 2 can be realized.

第１回路３７の第１可変抵抗器Ｒ１１、および第２回路３８の第１可変抵抗器Ｒ１２の一方は、設けられていなくてもよい。この場合でも、第１回路３７の第１可変抵抗器Ｒ１１、または第２回路３８の第１可変抵抗器Ｒ１２により、第１および第２補助通電板１２、１３に流れる電流の大きさＩ2を調整することができる。同様に、第１回路３７の第２可変抵抗器Ｒ２１、および第２回路３８の第２可変抵抗器Ｒ２２の一方は、設けられていなくてもよい。この場合でも、第１回路３７の第２可変抵抗器Ｒ２１、または第２回路３８の第２可変抵抗器Ｒ２２により、めっき金属板１１に流れる電流の大きさＩ1を調整することができる。 One of the first variable resistor R11 of the first circuit 37 and the first variable resistor R12 of the second circuit 38 may not be provided. Even in this case, the magnitude I 2 of the current flowing through the first and second auxiliary energizing plates 12 and 13 is set by the first variable resistor R11 of the first circuit 37 or the first variable resistor R12 of the second circuit 38. Can be adjusted. Similarly, one of the second variable resistor R21 of the first circuit 37 and the second variable resistor R22 of the second circuit 38 may not be provided. Even in this case, the magnitude I 1 of the current flowing through the plated metal plate 11 can be adjusted by the second variable resistor R21 of the first circuit 37 or the second variable resistor R22 of the second circuit 38.

さらに、第１および第２補助通電板１２、１３に適切な大きさＩ2の電流が流れる場合は、第１可変抵抗器Ｒ１１、Ｒ１２は設けられていなくてもよい。同様に、めっき金属板１１に適切な大きさＩ1の電流が流れる場合は、第２可変抵抗器Ｒ２１、Ｒ２２は設けられていなくてもよい。さらに、第１および第２補助通電板１２、１３に適切な大きさＩ2の電流が流れ、かつめっき金属板１１に適切な大きさＩ1の電流が流れる場合は、第１可変抵抗器Ｒ１１、Ｒ１２、および第２可変抵抗器Ｒ２１、Ｒ２２のいずれも設けられていなくてもよい。たとえば、第１および第２補助通電板１２、１３の抵抗値、ならびに、電源３５の出力電圧が適切に選択されている場合、第１および第２補助通電板１２、１３に適切な大きさＩ2の電流が流れ、かつめっき金属板１１に適切な大きさＩ1の電流が流れる状態を実現し得る。 Furthermore, when a current having an appropriate magnitude I 2 flows through the first and second auxiliary energization plates 12 and 13, the first variable resistors R11 and R12 may not be provided. Similarly, when a current having an appropriate magnitude I 1 flows through the plated metal plate 11, the second variable resistors R21 and R22 may not be provided. Furthermore, when a current having an appropriate magnitude I 2 flows through the first and second auxiliary energizing plates 12 and 13 and a current having an appropriate magnitude I 1 flows through the plated metal plate 11, the first variable resistor R11 is used. , R12 and the second variable resistors R21, R22 may not be provided. For example, when the resistance values of the first and second auxiliary energization plates 12 and 13 and the output voltage of the power source 35 are appropriately selected, the size I is appropriate for the first and second auxiliary energization plates 12 and 13. It is possible to realize a state in which a current of 2 flows and a current of an appropriate magnitude I 1 flows through the plated metal plate 11.

この実施形態において、めっき金属板１１に流れる電流の大きさＩ1に対する、第１および第２補助通電板１２、１３の各々に流れる電流の大きさＩ2の比を変更する必要がない場合は、第１可変抵抗器Ｒ１１、Ｒ１２および第２可変抵抗器Ｒ２１、Ｒ２２の代わりに、いずれも、固定抵抗器を用いてもよい。 In this embodiment, when it is not necessary to change the ratio of the current magnitude I 2 flowing through each of the first and second auxiliary energizing plates 12 and 13 to the current magnitude I 1 flowing through the plated metal plate 11. In place of the first variable resistors R11 and R12 and the second variable resistors R21 and R22, fixed resistors may be used.

図３Ｂは、本発明の第２の実施形態の変形例の構成を示す図である。図３Ｂにおいて、図３Ａに示す構成要素に対応する構成要素には、図３Ａと同じ参照符号を付して説明を省略する。   FIG. 3B is a diagram showing a configuration of a modified example of the second exemplary embodiment of the present invention. In FIG. 3B, constituent elements corresponding to those shown in FIG. 3A are assigned the same reference numerals as in FIG.

この通電加熱装置３０Ａと図３Ａに示す通電加熱装置３０との差異として、通電加熱装置３０Ａには、可変抵抗器Ｒ１２、Ｒ２２は設けられておらず、第２回路３８の導電経路には、第３分岐点Ｐ３と第４分岐点Ｐ４とが一致した分岐点である分岐点Ｐが設けられている。通電加熱装置３０Ａは、めっき金属板１１に流れる電流の大きさＩ2を調整する手段として、１つの第１可変抵抗Ｒ１（図３Ａの第１可変抵抗器Ｒ１１に対応）を含み、第１および第２補助通電板１２、１３に流れる電流の大きさＩ1を調整する手段として、１つの第２可変抵抗Ｒ２（図３Ａの第２可変抵抗器Ｒ２１に対応）を含む。 As a difference between the current heating device 30A and the current heating device 30 shown in FIG. 3A, the current heating device 30A is not provided with the variable resistors R12 and R22, and the second circuit 38 has a conductive path in the conductive path. A branch point P, which is a branch point where the third branch point P3 and the fourth branch point P4 coincide, is provided. The electric heating device 30A includes one first variable resistor R1 (corresponding to the first variable resistor R11 in FIG. 3A) as means for adjusting the magnitude I 2 of the current flowing through the plated metal plate 11, As a means for adjusting the magnitude I 1 of the current flowing through the second auxiliary energization plates 12 and 13, one second variable resistor R2 (corresponding to the second variable resistor R21 in FIG. 3A) is included.

第１および第２可変抵抗器Ｒ１、Ｒ２それぞれの抵抗値を適切に調整することにより、第１および第２補助通電板１２、１３の各々を流れる電流の大きさＩ2が、めっき金属板１１を流れる電流の大きさＩ1の１／２より大きくなるようにすることができる。したがって、この状態で、めっき金属板１１の通電加熱により生じる融液に作用するローレンツ力を抑制し、その融液の移動を抑制することができる。 By appropriately adjusting the resistance values of the first and second variable resistors R1 and R2, the magnitude I 2 of the current flowing through each of the first and second auxiliary energizing plates 12 and 13 is changed to the plated metal plate 11. Can be made larger than ½ of the magnitude I 1 of the current flowing through. Therefore, in this state, the Lorentz force acting on the melt generated by energization heating of the plated metal plate 11 can be suppressed, and the movement of the melt can be suppressed.

本発明の通電加熱装置を用いた場合、および図１に示す特許文献３の通電加熱装置を用いた場合のそれぞれについて、通電加熱対象のめっき金属板の各部に生じるローレンツ力を、磁場解析（シミュレーション）により求めた。解析は、下記の条件に基づいて行った。   Magnetic field analysis (simulation) of Lorentz force generated in each part of a plated metal plate to be energized and heated for each of the case of using the electric heating device of the present invention and the case of using the electric heating device of Patent Document 3 shown in FIG. ). The analysis was performed based on the following conditions.

めっき金属板のサイズは、以下の通りとした。
幅：２００ｍｍ
厚さ：１．６ｍｍ
長さ：１０００ｍｍ The size of the plated metal plate was as follows.
Width: 200mm
Thickness: 1.6mm
Length: 1000mm

第１および第２補助通電板は、互いに同じサイズのものとし、そのサイズは、下記の通りとした。
幅：２００ｍｍ
厚さ：２０ｍｍ
長さ：１０００ｍｍ The first and second auxiliary energization plates were of the same size, and the sizes were as follows.
Width: 200mm
Thickness: 20mm
Length: 1000mm

めっき金属板と第１補助通電板との間隔、およびめっき金属板と第２補助通電板との間隔は、いずれも、２０ｍｍとした。   The distance between the plated metal plate and the first auxiliary current plate and the distance between the plated metal plate and the second auxiliary current plate were both 20 mm.

めっき金属板と、第１および第２補助通電板の各々とには、互いに逆向きの直流電流を流すものとした。めっき金属板に流す直流電流の大きさは、１４３００Ａとした。したがって、図１に示す特許文献３の通電加熱装置を用いる場合は、第１および第２補助通電板に流す直流電流の大きさは、７１５０Ａ（１４３００Ａの１／２）とした。本発明の通電加熱装置を用いる場合は、第１および第２補助通電板に流す直流電流の大きさを、７１５０Ａより大きい範囲で変更しながら、めっき金属板に生じるローレンツ力が最小になるときの直流電流の大きさを求めた。   Direct currents in opposite directions flow through the plated metal plate and each of the first and second auxiliary energizing plates. The magnitude of the direct current flowing through the plated metal plate was 14300A. Therefore, when using the energization heating device of Patent Document 3 shown in FIG. 1, the magnitude of the direct current flowing through the first and second auxiliary energization plates is 7150A (1/2 of 14300A). When the current heating device of the present invention is used, the Lorentz force generated on the plated metal plate is minimized while changing the magnitude of the direct current flowing through the first and second auxiliary current plates in a range larger than 7150A. The magnitude of the direct current was determined.

図４に、めっき金属板の幅方向に関して、めっき金属板の板幅中央から距離と、その位置で生じるローレンツ力の大きさとの関係を示す。めっき部に作用するローレンツ力はめっき金属板の板幅中央に関して板幅方向に対称であるため、図４では、板幅中央から板幅の半分の領域のみを図示している。図４において、ローレンツ力の値が負の数であることは、ローレンツ力がめっき金属板の幅方向中央側に向いていることを意味する。   FIG. 4 shows the relationship between the distance from the center of the plate width of the plated metal plate and the magnitude of the Lorentz force generated at that position in the width direction of the plated metal plate. Since the Lorentz force acting on the plated portion is symmetrical in the plate width direction with respect to the plate width center of the plated metal plate, FIG. 4 shows only the region half the plate width from the plate width center. In FIG. 4, the value of the Lorentz force being a negative number means that the Lorentz force is directed to the center side in the width direction of the plated metal plate.

特許文献３の通電加熱装置を用いた場合は、めっき金属板の中央から約４０ｍｍまでの位置では、ローレンツ力はほぼ０であったが、中央から４０ｍｍを超えて遠くなると、ローレンツ力の絶対値は次第に大きくなった。これに対して、本発明の通電加熱装置を用いた場合は、めっき金属板の中央から約９０ｍｍまでの位置で、ローレンツ力はほぼ０であり、中央から９０ｍｍを超えて遠くなると、ローレンツ力の絶対値は次第に大きくなった。   When the current heating device of Patent Document 3 was used, the Lorentz force was almost 0 at a position from the center of the plated metal plate to about 40 mm, but when it was far beyond 40 mm from the center, the absolute value of the Lorentz force was Gradually grew. On the other hand, when the current heating device of the present invention is used, the Lorentz force is almost 0 at a position from the center of the plated metal plate to about 90 mm, and when the distance from the center exceeds 90 mm, the Lorentz force is The absolute value gradually increased.

めっき金属板の中央から、９０ｍｍの位置で比較するとローレンツ力は、本発明の通電加熱装置を用いた場合が約−０．１ＭＮ／ｍ3であったのに対し、特許文献３の通電加熱装置を用いた場合は約−１ＭＮ／ｍ3であった。 Compared to the center of the plated metal plate at a position of 90 mm, the Lorentz force was about −0.1 MN / m 3 when the current heating device of the present invention was used, whereas the current heating device of Patent Document 3 Was about −1 MN / m 3 .

ローレンツ力の絶対値が０．１ＭＮ／ｍ3以下であると、めっき層の寄りは実質的に生じない。このため、めっき層の寄りが生じた部分を、トリミングにより除去するとすれば、めっき金属板の幅方向片側につき、特許文献３の通電加熱装置を用いた場合は、めっき金属板の幅の約５０％の領域を除去しなければならないのに対して、本発明の通電加熱装置を用いた場合は、めっき金属板の幅の１０％の領域を除去すれば足りる。 When the absolute value of the Lorentz force is 0.1 MN / m 3 or less, the plating layer is not substantially shifted. For this reason, if the portion where the plating layer is shifted is removed by trimming, when the current heating device of Patent Document 3 is used for one side in the width direction of the plated metal plate, the width of the plated metal plate is about 50. % Region must be removed, but when the current heating device of the present invention is used, it is sufficient to remove a region of 10% of the width of the plated metal plate.

以上の結果は、上述のように、めっき金属板と第１および第２補助通電板との間隔が２０ｍｍの場合であるが、この間隔を、１ｍｍ、および４０ｍｍに変更して、同様の解析を行った。その結果、それぞれの間隔に対して適切な電流Ｉ1およびＩ2を設定すれば、めっき金属板と第１および第２補助通電板との間隔が２０ｍｍの場合と同様に、特許文献３の通電加熱装置を用いた場合に比して、本願発明の通電加熱装置を用いた場合で、ローレンツ力の大きさ（絶対値）は小さくなった。 The above results are for the case where the distance between the plated metal plate and the first and second auxiliary energizing plates is 20 mm as described above. The same analysis was performed by changing this interval to 1 mm and 40 mm. went. As a result, when appropriate currents I 1 and I 2 are set for the respective intervals, the energization of Patent Document 3 is performed as in the case where the interval between the plated metal plate and the first and second auxiliary energization plates is 20 mm. Compared with the case of using the heating device, the magnitude (absolute value) of the Lorentz force was smaller in the case of using the electric heating device of the present invention.

１０、２０、３０、４０：通電加熱装置、
１１：ホットスタンプ用めっき金属板、 １２：第１補助通電板、
１３：第２補助通電板、 １４：給電部材、 １５、２５：第１電源、
１６、２６：第２電源、 １６ａ、２６ａ：第１出力端子、
１６ｂ、２６ｂ：第２出力端子、 ２７：同期装置、 ３５：電源、
３５ａ：第１出力端子、 ３５ｂ：第２出力端子、
３７、４７：第１回路、 ３８、４８：第２回路、 Ｐ：分岐点、
Ｐ１：第１分岐点、 Ｐ２：第２分岐点、 Ｐ３：第３分岐点、
Ｐ４：第４分岐点、 Ｒ１、Ｒ１１、Ｒ１２：第１可変抵抗器、
Ｒ２、Ｒ２１、Ｒ２２：第２可変抵抗器 10, 20, 30, 40: current heating device,
11: Plated metal plate for hot stamping, 12: First auxiliary energizing plate,
13: Second auxiliary energization plate, 14: Power supply member, 15, 25: First power supply,
16, 26: second power source, 16a, 26a: first output terminal,
16b, 26b: second output terminal, 27: synchronization device, 35: power supply,
35a: first output terminal, 35b: second output terminal,
37, 47: first circuit, 38, 48: second circuit, P: branch point,
P1: First branch point, P2: Second branch point, P3: Third branch point,
P4: fourth branch point, R1, R11, R12: first variable resistor,
R2, R21, R22: second variable resistor

Claims (9)

第１および第２端部を有するホットスタンプ用めっき金属板に通電して加熱する通電加熱装置であって、
前記めっき金属板と同じ平面形状を有し、前記めっき金属板の第１表面に対向されて前記めっき金属板に平行に配置される第１補助通電板であって、前記めっき金属板の前記第１および第２端部とそれぞれ位置を揃えて配置される第１および第２端部を有する第１補助通電板と、
前記めっき金属板と同じ平面形状を有し、前記めっき金属板の第２表面に対向されて前記めっき金属板に平行に配置される第２補助通電板であって、前記めっき金属板の前記第１および第２端部とそれぞれ位置を揃えて配置される第１および第２端部を有する第２補助通電板と、
前記めっき金属板の第１および第２端部、ならびに前記第１および第２補助通電板の各々の第１および第２端部に接続され、前記めっき金属板に電流を流すとともに、前記第１および第２補助通電板の各々に、前記めっき金属板に流れる電流の大きさの１／２より大きく前記めっき金属板に流れる電流と逆向きの電流を流すための電源装置とを備えた、ホットスタンプ用めっき金属板の通電加熱装置。 An energization heating device that energizes and heats a plated metal plate for hot stamping having first and second ends,
A first auxiliary energization plate having the same planar shape as the plated metal plate, opposed to the first surface of the plated metal plate and arranged in parallel to the plated metal plate, A first auxiliary energization plate having first and second ends arranged in alignment with the first and second ends, respectively;
A second auxiliary energizing plate having the same planar shape as the plated metal plate, facing the second surface of the plated metal plate and disposed in parallel to the plated metal plate, A second auxiliary energization plate having first and second ends arranged in alignment with the first and second ends, respectively;
The first and second end portions of the plated metal plate and the first and second end portions of the first and second auxiliary energizing plates, respectively, are used to pass current through the plated metal plate, and the first And a power supply device for supplying each of the second auxiliary energizing plates with a current larger than ½ of the current flowing in the plated metal plate and in a direction opposite to the current flowing in the plated metal plate, Electric heating device for stamped metal plate. 請求項１に記載の通電加熱装置であって、
前記電源装置は、
前記めっき金属板の第１および第２端部に接続され前記めっき金属板に直流電流を流す第１電源装置と、
前記第１および第２補助通電板の各々の第１および第２端部に接続され、前記第１電源装置によって前記めっき金属板に流される電流の大きさの１／２より大きい直流電流を、前記第１および第２補助通電板の各々に流す第２電源装置とを備え、
前記第２電源装置は、
第１および第２出力端子を備えた電源と、
前記電源の第１出力端子と、前記第１補助通電板の第１端部、および前記第２補助通電板の第１端部とを電気的に接続するとともに、前記電源の第２出力端子と、前記第１補助通電板の第２端部、および前記第２補助通電板の第２端部とを電気的に接続して、前記電源に対して、前記第１補助通電板と、前記第２補助通電板とを並列に接続する回路とを備えた、通電加熱装置。 It is an electricity heating apparatus of Claim 1, Comprising:
The power supply device
A first power supply device connected to the first and second ends of the plated metal plate and causing a direct current to flow through the plated metal plate;
A direct current that is connected to the first and second ends of each of the first and second auxiliary energization plates and that is greater than ½ of the magnitude of the current that flows through the plated metal plate by the first power supply device, A second power supply device that flows through each of the first and second auxiliary energization plates,
The second power supply device
A power supply having first and second output terminals;
The first output terminal of the power source, the first end of the first auxiliary energization plate, and the first end of the second auxiliary energization plate are electrically connected, and the second output terminal of the power source Electrically connecting a second end of the first auxiliary energization plate and a second end of the second auxiliary energization plate to the power source, and the first auxiliary energization plate, 2 An electric heating device provided with a circuit for connecting the auxiliary current supply plate in parallel. 請求項１に記載の通電加熱装置であって、
前記電源装置は、
前記めっき金属板の第１および第２端部に接続され前記めっき金属板に交流電流を流す第１電源装置と、
前記第１および第２補助通電板の各々の第１および第２端部に接続され、前記第１電源装置によって前記めっき金属板に流される電流の大きさの１／２より大きい交流電流を、前記第１および第２補助通電板の各々に流す第２電源装置と、
前記めっき金属板に流れる交流電流と前記第１および第２補助通電板を流れる交流電流とを逆位相になるように調整する同期装置とを備え、
前記第２電源装置は、
第１および第２出力端子を備えた電源と、
前記電源の第１出力端子と、前記第１補助通電板の第１端部、および前記第２補助通電板の第１端部とを電気的に接続するとともに、前記電源の第２出力端子と、前記第１補助通電板の第２端部、および前記第２補助通電板の第２端部とを電気的に接続して、前記電源に対して、前記第１補助通電板と、前記第２補助通電板とを並列に接続する回路とを備えた、通電加熱装置。 It is an electricity heating apparatus of Claim 1, Comprising:
The power supply device
A first power supply device connected to the first and second end portions of the plated metal plate and causing an alternating current to flow through the plated metal plate;
An alternating current that is connected to the first and second ends of each of the first and second auxiliary energization plates and that is greater than ½ of the magnitude of the current that flows through the plated metal plate by the first power supply device, A second power supply for flowing through each of the first and second auxiliary energization plates;
A synchronizer that adjusts the alternating current flowing through the plated metal plate and the alternating current flowing through the first and second auxiliary energizing plates to have opposite phases;
The second power supply device
A power supply having first and second output terminals;
The first output terminal of the power source, the first end of the first auxiliary energization plate, and the first end of the second auxiliary energization plate are electrically connected, and the second output terminal of the power source Electrically connecting a second end of the first auxiliary energization plate and a second end of the second auxiliary energization plate to the power source, and the first auxiliary energization plate, 2 An electric heating device provided with a circuit for connecting the auxiliary current supply plate in parallel. 請求項１に記載の通電加熱装置であって、
前記電源装置が、
第１および第２出力端子を備えた電源と、
前記電源に対して、前記めっき金属板と、前記第１補助通電板と、前記第２補助通電板とを並列に接続する回路とを備え、
前記回路は、
前記電源の前記第１出力端子と、前記めっき金属板の第１端部とを接続し、第１分岐点が設けられた導電経路と、
前記第１補助通電板の第２端部と、前記第２補助通電板の第２端部とを接続し、第２分岐点が設けられた導電経路と、
前記第１分岐点と、前記第２分岐点とを接続する導電経路と、
前記電源の前記第２出力端子と、前記めっき金属板の第２端部とを接続し、第３分岐点が設けられた導電経路と、
前記第１補助通電板の第１端部と、前記第２補助通電板の第１端部とを接続し、第４分岐点が設けられた導電経路と、
前記第３分岐点と、前記第４分岐点とを接続する導電経路と、
を含む、通電加熱装置。 It is an electricity heating apparatus of Claim 1, Comprising:
The power supply is
A power supply having first and second output terminals;
A circuit for connecting the plated metal plate, the first auxiliary energizing plate, and the second auxiliary energizing plate in parallel to the power source,
The circuit is
A conductive path connecting the first output terminal of the power source and the first end of the plated metal plate and provided with a first branch point;
A conductive path connecting the second end of the first auxiliary energization plate and the second end of the second auxiliary energization plate, and having a second branch point;
A conductive path connecting the first branch point and the second branch point;
A conductive path connecting the second output terminal of the power source and the second end of the plated metal plate and provided with a third branch point;
A conductive path connecting the first end of the first auxiliary energization plate and the first end of the second auxiliary energization plate, and having a fourth branch point;
A conductive path connecting the third branch point and the fourth branch point;
Including an electric heating device. 請求項４に記載の通電加熱装置であって、
前記回路が、前記第１分岐点と前記第２分岐点との間の導電経路、および前記第３分岐点と前記第４分岐点との間の導電経路の少なくとも一方に介装された第１抵抗器をさらに含む、通電加熱装置。 It is an electricity heating apparatus of Claim 4, Comprising:
The circuit is interposed in at least one of a conductive path between the first branch point and the second branch point and a conductive path between the third branch point and the fourth branch point. An energization heating device further including a resistor. 請求項４または５に記載の通電加熱装置であって、
前記第１分岐点と前記めっき金属板の第１端部との間の導電経路、および前記第３分岐点と前記めっき金属板の第２端部との間の導電経路の少なくとも一方に介装された第２抵抗器をさらに含む、通電加熱装置。 The energization heating device according to claim 4 or 5,
At least one of a conductive path between the first branch point and the first end of the plated metal plate and a conductive path between the third branch point and the second end of the plated metal plate are interposed. The energization heating apparatus further including the made 2nd resistor. 請求項１〜６のいずれかに記載の通電加熱装置であって、
前記めっき金属板が、ホットスタンプ用めっき鋼板である、通電加熱装置。 It is an electricity heating apparatus in any one of Claims 1-6,
An energization heating apparatus, wherein the plated metal plate is a plated steel plate for hot stamping. 請求項１〜７のいずれかに記載の通電加熱装置であって、
前記第１および第２補助通電板が、銅または銅合金からなる、通電加熱装置。 It is an electricity heating apparatus in any one of Claims 1-7,
An energization heating apparatus in which the first and second auxiliary energization plates are made of copper or a copper alloy. 請求項１〜８のいずれかに記載の通電加熱装置であって、
前記第１および第２補助通電板の各々と前記めっき金属板とが、１ｍｍ以上の間隔をあけて配置されるように構成された、通電加熱装置。
It is an electricity heating apparatus in any one of Claims 1-8,
Each of the said 1st and 2nd auxiliary | assistant electricity supply board and the said plating metal plate are comprised so that it may arrange | position with the space | interval of 1 mm or more.
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