JP5884181B2 - Slip control method for energizing roll and method for manufacturing electroplated steel sheet - Google Patents
Slip control method for energizing roll and method for manufacturing electroplated steel sheet Download PDFInfo
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本発明は、電気めっき鋼板製造ラインにおける、通電ロールのスリップ制御方法および電気めっき鋼板の製造方法に関する。 The present invention relates to a slip control method for energizing rolls and a method for producing an electroplated steel sheet in an electroplated steel sheet production line.
鋼板等の被処理材に亜鉛、錫、クロム等のめっきを施すための手段の１つとして、例えば、電気めっき法が挙げられる。電気めっき法は、めっきタンク内に浸漬させた電極を陽極とし、鋼板を陰極とし、これらの間に電圧を印加して鋼板に通電することにより鋼板表面にめっきを施す。また、電気めっきを施す装置において、鋼板への通電は、通電ロールを鋼板に接触させることにより行われる。 As one of means for plating a material to be treated such as a steel plate with zinc, tin, chromium or the like, for example, an electroplating method can be mentioned. In the electroplating method, an electrode immersed in a plating tank is used as an anode, a steel plate is used as a cathode, and a voltage is applied between them to energize the steel plate, thereby plating the steel plate surface. Moreover, in the apparatus which performs electroplating, electricity supply to a steel plate is performed by making an electricity supply roll contact a steel plate.
特許文献１には、ロール表面または前記ロール表面に必要に応じてサーメット溶射、セラミックス溶射により施したロール表面被覆層を、グリッドブラスト加工、放電ダル加工、レーザーダル加工の何れかによりダル加工して得られたＲａが０．６μｍ以上の表面粗度を有する高硬度プロセスロールの表面凸部のピークを、ダイヤモンド砥石、ダイヤモンド砥粒付ベルトを用いて研削し、前記表面凸部を台形化したことを特徴とする定摩擦のプロセスロールの技術が開示されている。
In
しかしながら、一方で、生産性向上のために高速で電気めっきを実施する際に、めっき液が通電ロールに巻付き、鋼板と通電ロールとの間にスリップが発生する場合がある。スリップが発生すると、鋼板と通電ロールが離れて、局所的に電流が集中するため、鋼板上にスポット痕（アークスポット）が残り、品質不良を引き起こす。そして、特許文献１のような溶射を施したロール表面被覆層の場合、スリップの発生が顕著になるという問題がある。
However, on the other hand, when electroplating is performed at a high speed to improve productivity, the plating solution may be wound around the energizing roll and slip may occur between the steel sheet and the energizing roll. When the slip occurs, the steel sheet and the energizing roll are separated from each other, and the current concentrates locally. Therefore, spot marks (arc spots) remain on the steel sheet, resulting in poor quality. And in the case of the roll surface coating layer which performed thermal spraying like
本発明は、上記課題に鑑みてなされたものであり、高速で電気めっきを行う場合でも、通電ロールへのめっき液の巻付きを抑制し、鋼板と通電ロールとの間のスリップの発生を抑制することができる通電ロールのスリップ制御方法および電気めっき鋼板の製造方法を提供することを目的とする。 This invention is made | formed in view of the said subject, Even when performing electroplating at high speed, it suppresses winding of the plating solution to an electricity supply roll, and suppresses generation | occurrence | production of the slip between a steel plate and an electricity supply roll. An object of the present invention is to provide a slip control method for an energizing roll and a method for producing an electroplated steel sheet.
本発明者らは鋭意検討した結果、通電ロール表面の保水量を規定することにより、スリップ発生を抑制することができることを見出した。本発明の要旨は、以下の通りである。
［１］冷延鋼板を、めっき液中に浸漬し、通電ロールから鋼板に電流を流して連続して電気めっきをする際に、前記通電ロールの表面の保水量を７４．６ｍｍ２／ｍ以上とし、かつ、電気めっき処理時に前記通電ロールと前記鋼板が接触していることを特徴とする通電ロールのスリップ制御方法。
［２］冷延鋼板を、めっき液中に浸漬し、通電ロールから鋼板に電流を流して連続して、電気めっきをする際に、前記通電ロールの表面の保水量を７４．６ｍｍ２／ｍ以上とし、かつ、電気めっき処理時に前記通電ロールと前記鋼板が接触していることを特徴とする電気めっき鋼板の製造方法。
As a result of intensive studies, the present inventors have found that the occurrence of slip can be suppressed by defining the amount of water retained on the surface of the energizing roll. The gist of the present invention is as follows.
[1] When a cold-rolled steel sheet is immersed in a plating solution and a current is passed from the energizing roll to the steel sheet for continuous electroplating, the amount of water retained on the surface of the energizing roll is 74.6 mm 2 / m or more. And the said roll and the said steel plate are contacting at the time of an electroplating process, The slip control method of the conductive roll characterized by the above-mentioned.
[2] When the cold-rolled steel sheet is immersed in a plating solution and continuously electroplated by passing an electric current from the energizing roll to the steel sheet, the amount of water retained on the surface of the energizing roll is 74.6 mm 2 / m. The method for producing an electroplated steel sheet as described above, wherein the energizing roll and the steel sheet are in contact with each other during electroplating.
本発明によれば、通電ロール表面の保水量を規定することにより、鋼板と通電ロールとの間のスリップを抑制できる。その結果、電気めっき鋼板の製造において、生産量、原単位の向上に繋がる。 According to the present invention, it is possible to suppress slip between the steel sheet and the energizing roll by defining the water retention amount on the energizing roll surface. As a result, in the production of the electroplated steel sheet, the production volume and the basic unit are improved.
電気めっきラインで高速にて電気めっきを行う際、通電ロールの表面にめっき液が巻付き、通電ロールと鋼板との間でスリップを引き起こす。一般に通電ロール表面の粗さ（Ｒａ）が低下すると、鋼板と通電ロールの間の摩擦係数が低下し、スリップが起こると考えられる。まず本発明者らは、スリップが起こった通電ロールとスリップが起こらなかった通電ロールについて、通電ロール表面の粗さと摩擦係数、ならびにスリップ発生との間の相関性を検討した。その結果、通電ロール表面の粗さについては、スリップが起こらなかった通電ロールのほうが高く、一方で、摩擦係数については、スリップが起こった通電ロールのほうが高くなった。すなわち、通電ロール表面の粗さのみの比較では摩擦係数を評価できないことがわかった。また、鋼板と通電ロールのスリップ限界摩擦係数を調べたところ、スリップ限界摩擦係数は、スリップを引き起こした通電ロールの摩擦係数をはるかに下回る値であった。 When electroplating is performed at high speed on the electroplating line, the plating solution is wound around the surface of the energizing roll, causing slip between the energizing roll and the steel plate. Generally, when the roughness (Ra) of the energizing roll surface is reduced, the friction coefficient between the steel sheet and the energizing roll is reduced, and it is considered that slip occurs. First, the inventors examined the correlation between the surface roughness of the energizing roll, the friction coefficient, and the occurrence of slip for the energizing roll where slip occurred and the energizing roll where slip did not occur. As a result, the surface roughness of the energizing roll was higher in the energizing roll in which no slip occurred, while the coefficient of friction was higher in the energizing roll in which slip occurred. That is, it was found that the friction coefficient cannot be evaluated only by comparing the roughness of the surface of the energizing roll. Moreover, when the slip limit friction coefficient of the steel sheet and the current carrying roll was examined, the slip limit friction coefficient was much lower than the friction coefficient of the current carrying roll that caused the slip.
この結果から、発明者らは、摩擦係数がスリップに関係しているのではなく、鋼板と通電ロールとの間のめっき液が原因であると考えた。通電ロールの表面の形状により、鋼板と通電ロールとの間にめっき液の水膜が形成される。このめっき液の水膜を介して通電するため、めっき液が巻付くのではないかと推測した（図３（ａ）参照）。そこで、鋼板と通電ロール表面が接触し、かつ、鋼板と通電ロールとの間のめっき液の量、すなわち通電ロール表面におけるめっき液の保水量（以下、単に保水量と称することもある。）を規定することにより、スリップ発生を抑制することができると考えた。 From this result, the inventors considered that the friction coefficient was not related to the slip, but was caused by the plating solution between the steel sheet and the energizing roll. Depending on the shape of the surface of the energizing roll, a water film of the plating solution is formed between the steel plate and the energizing roll. Since current was passed through the water film of the plating solution, it was assumed that the plating solution would be wound (see FIG. 3A). Therefore, the amount of the plating solution between the steel plate and the energizing roll, that is, the amount of the plating solution between the steel plate and the energizing roll, that is, the amount of water retained by the plating solution on the surface of the energizing roll (hereinafter sometimes simply referred to as the water retaining amount). It was considered that the occurrence of slip can be suppressed by prescribing.
保水量とスリップ発生との相関性について検討するため、ＪＩＳ Ｂ ０６７１−２（２００２）に規定される線形負荷曲線を用いて、通電ロールの表面粗度から保水量を算出することとした（図１参照）。横軸に平行な線分を測定曲線に重ね、その線分を越えて＋側に飛び出た凸部の底辺の長さの総和と評価長さの比を百分率（％）で表したものを、その”切断レベル”のｍｒ値という（図２参照）。”切断レベル”は測定曲線の最も高い山頂からの深さで設定する。これをピーク基準といい、切断レベルまでの深さは、図１の破線で示すＲｔ値に対する百分率（０−１００％）で設定する。
なお、図１、図２において、コア部高さＲｋは、コア部の上側と下側との差である。山部高さＲｐｋは、コア部の上にある突出山部の平均高さである。谷部深さＲｖｋは、コア部の下にある突出谷部の平均深さである。コア部の負荷長さ率Ｍｒ１は、突出山部とコア部の分離線と負荷曲線の交点の負荷長さ率である。コア部の負荷長さ率Ｍｒ２は、突出谷部とコア部の分離線と負荷曲線の交点の負荷長さ率である。
In order to examine the correlation between the water retention amount and the occurrence of slip, the water retention amount was calculated from the surface roughness of the energizing roll using a linear load curve defined in JIS B 0671-2 (2002) (Fig. 1). A line segment parallel to the horizontal axis is superimposed on the measurement curve, and the ratio of the total length of the bases of the protrusions protruding beyond the line segment to the + side and the evaluation length is expressed as a percentage (%). The mr value of the “cutting level” is referred to (see FIG. 2). The “cutting level” is set as the depth from the highest peak of the measurement curve. This is called a peak reference, and the depth to the cutting level is set as a percentage (0-100%) with respect to the Rt value indicated by the broken line in FIG.
In FIGS. 1 and 2, the core height Rk is the difference between the upper side and the lower side of the core part. The peak height Rpk is the average height of the protruding peak portions above the core portion. The valley depth Rvk is the average depth of the protruding valley below the core portion. The load length rate Mr1 of the core portion is a load length rate at the intersection of the protruding peak portion, the separation line of the core portion, and the load curve. The load length rate Mr2 of the core portion is a load length rate at the intersection of the protruding valley portion, the separation line of the core portion, and the load curve.
線形負荷曲線を用いた通電ロール表面の保水量の計算方法について説明する。そこで、本発明では、図２に示すように、評価長さｌｎ当たりの保水量、すなわち通電ロール表面の保水量Ｓを、山部の保水量Ｓ１、中間の保水量Ｓ２、谷部の保水量Ｓ３の３つの領域の総和として求めることができる。 The calculation method of the water retention amount on the energizing roll surface using a linear load curve will be described. Therefore, in the present invention, as shown in FIG. 2, the water retention amount per evaluation length ln, that is, the water retention amount S on the surface of the energizing roll, the water retention amount S1, the intermediate water retention amount S2, and the water retention amount in the valley portion. It can be obtained as the sum of the three areas of S3.
まず、図２から、測定距離Ｌにおける、山部面積Ａ１、谷部面積Ａ２は以下のように表すことができる。
Ａ１＝ＲｐＫ×Ｌ×Ｍｒ１／１００／２・・・（１）
Ａ２＝Ｒｖｋ×（Ｌ−Ｌ×Ｍｒ２／１００）／２・・・（２）
したがって、山部の保水量Ｓ１、中間の保水量Ｓ２、谷部の保水量Ｓ３の領域の面積は、以下のようにそれぞれ表すことができる。
Ｓ１＝Ｒｐｋ×Ｌ−Ａ１・・・（３）
Ｓ２＝Ｒｋ×（Ｌ×Ｍｒ２／１００−Ｌ×Ｍｒ１／１００）／２＋Ｒｋ×（Ｌ−Ｌ×Ｍｒ２／１００）・・・（４）
Ｓ３＝Ａ２・・・（５）
したがって、通電ロール表面の保水量Ｓは、
Ｓ＝Ｓ１＋Ｓ２＋Ｓ３・・・（６）
で表すことができる。上記式（１）〜（６）を用いることにより、通電ロール表面の保水量Ｓを求めることができる。
First, from FIG. 2, the peak area A1 and the valley area A2 at the measurement distance L can be expressed as follows.
A1 = RpK × L × Mr1 / 100/2 (1)
A2 = Rvk × (L−L × Mr2 / 100) / 2 (2)
Accordingly, the areas of the mountain water retention amount S1, the intermediate water retention amount S2, and the valley water retention amount S3 can be expressed as follows.
S1 = Rpk × L−A1 (3)
S2 = Rk × (L × Mr2 / 100−L × Mr1 / 100) / 2 + Rk × (L−L × Mr2 / 100) (4)
S3 = A2 (5)
Therefore, the water retention amount S on the surface of the energizing roll is
S = S1 + S2 + S3 (6)
Can be expressed as By using the above formulas (1) to (6), the water retention amount S on the surface of the energizing roll can be obtained.
なお、上記式（１）〜（６）において、Ｒｐｋ、Ｒｋ、Ｒｖｋ、Ｍｒ１、Ｍｒ２は、それぞれ、通電ロールの表面粗さから算出することができる。また、通電ロール表面粗さの算出方法としては、粗度計により求めることができる。また、測定距離Ｌは、粗度計で測定する測定長さであればよい。 In the above formulas (1) to (6), Rpk, Rk, Rvk, Mr1, and Mr2 can be calculated from the surface roughness of the energizing roll, respectively. Further, as a method for calculating the surface roughness of the energizing roll, it can be obtained by a roughness meter. Moreover, the measurement distance L should just be the measurement length measured with a roughness meter.
本発明者らは、表面の仕様が異なる通電ロールについて、上記式（１）〜（６）を用いて保水量Ｓを算出しスリップ発生について評価を行った。表１に示すように、通電ロール表面の仕様が溶射のもの（２種）、Ｃｒめっきしたものについて、保水量Ｓとスリップ発生との関係について検討した。めっき液はＮｉめっき液を用いた。また、めっき付着量が４５〜９５ｇ／ｍ２となる条件で電気めっきを行った。スリップ発生の有無は、通電開始時のライン速度と、通電後のライン速度との差（変動値）を調べ、変動値が３００ｍｐｍ以上をスリップ発生有、３００ｍｐｍ未満をスリップ発生無とした。ライン速度は、通電ロールの回転数から算出した。なお、保水量Ｓの算出において、測定距離Ｌは、粗度計の測定長さである４ｍｍとした。表１に結果を示す。 The present inventors calculated the water retention amount S using the above formulas (1) to (6) and evaluated the occurrence of slip for the energizing rolls having different surface specifications. As shown in Table 1, the relationship between the water retention amount S and the occurrence of slip was examined for the surface of the energizing roll having thermal spray specifications (2 types) and Cr plated. Ni plating solution was used as the plating solution. Moreover, the electroplating was performed under the condition that the plating adhesion amount was 45 to 95 g / m 2 . The presence or absence of slip generation was determined by examining the difference (variation value) between the line speed at the start of energization and the line speed after energization. The line speed was calculated from the rotational speed of the energizing roll. In the calculation of the water retention amount S, the measurement distance L was 4 mm, which is the measurement length of the roughness meter. Table 1 shows the results.
表１の結果から、通電ロール表面の保水量Ｓが７４．６ｍｍ２／ｍ以上であれば、スリップが発生しないことがわかった。 From the results in Table 1, it was found that when the water retention amount S on the surface of the energizing roll was 74.6 mm 2 / m or more, no slip occurred.
本発明において、通電ロール表面の保水量Ｓを７４．６ｍｍ２／ｍ以上にすることにより、スリップ発生を抑制することができる。このスリップ発生を抑制できる理由について、詳細は明らかではないが、通電ロール表面の形状により、通電ロール表面の保水量が変化すると考えられる。通電ロール表面の保水量Ｓを７４．６ｍｍ２／ｍ以上にすることにより、めっき液が通電ロール表面に巻付くことを制御でき、その結果、スリップ発生を抑制することができると考えられる。 In the present invention, the occurrence of slip can be suppressed by setting the water retention amount S on the surface of the energizing roll to 74.6 mm 2 / m or more. The reason why the occurrence of the slip can be suppressed is not clear in detail, but it is considered that the water retention amount on the surface of the energizing roll changes depending on the shape of the surface of the energizing roll. By setting the water retention amount S on the surface of the energizing roll to 74.6 mm 2 / m or more, it is possible to control the winding of the plating solution around the surface of the energizing roll, and as a result, the occurrence of slip can be suppressed.
本発明において、通電ロール表面の保水量Ｓを７４．６ｍｍ２／ｍ以上にし、かつ電気めっき処理時に通電ロールと鋼板が接触していることを特徴とする。保水量Ｓが７４．６ｍｍ２／ｍ未満であると、保水量が不足して鋼板と通電ロールとの間にめっき液の水膜ができ、めっき液を介して通電する（図３（ａ）参照）。このため、通電ロールと鋼板が接触しなくなり、すなわち、めっき液が通電ロール表面に巻付くと考えられ、めっき液の巻付きによりスリップが発生し得る。一方、保水量Ｓが７４．６ｍｍ２／ｍ以上では、保水量が十分となり、通電ロールから直接通電される（図３（ｂ）参照）。このため、鋼板と通電ロールとの間にめっき液の水膜はできず、めっき液が通電ロール表面に巻付くことに起因するスリップ発生を抑制することができる。 In the present invention, the water retention amount S on the surface of the energizing roll is set to 74.6 mm 2 / m or more, and the energizing roll and the steel plate are in contact during the electroplating process. When the water retention amount S is less than 74.6 mm 2 / m, the water retention amount is insufficient, and a water film of a plating solution is formed between the steel sheet and the current-carrying roll, and electricity is passed through the plating solution (FIG. 3A). reference). For this reason, it is considered that the current-carrying roll and the steel plate are not in contact, that is, the plating solution is wound around the surface of the current-carrying roll, and slipping can occur due to winding of the plating solution. On the other hand, when the water retention amount S is 74.6 mm 2 / m or more, the water retention amount is sufficient, and the energization roll is directly energized (see FIG. 3B). For this reason, the water film of a plating solution cannot be formed between a steel plate and an electricity supply roll, and the occurrence of slip due to the plating solution being wound around the surface of the electricity supply roll can be suppressed.
電気めっき処理時に通電ロールと鋼板が接触するには、例えば、通電ロール表面の通電ロール表面の凸部の先端形状は平滑化されていない形状（ピークカットされていない形状）にすればよい。すなわち、通電ロール表面が所定の粗さを有していればよく、例えば、ピークカット等による通電ロール表面の凸部の先端形状の平滑化がされていない形状であればよい。凸部の先端形状が平滑化されている場合（図３（ａ）参照）、めっき液を介して通電する。そして、鋼板と通電ロールとの間にめっき液の水膜ができ、この水膜によりスリップが発生し得る。一方、凸部の先端形状が平滑化されていない場合、通電ロールから直接通電される（図３（ｂ）参照）。このため、本発明においては、凸部の先端形状は平滑化されていない形状であることが好ましい。なお、粗さの付与としては、例えば、ショットブラスト加工などが挙げられる。 In order for the energizing roll and the steel sheet to contact each other during the electroplating process, for example, the tip shape of the convex portion of the energizing roll surface on the energizing roll surface may be an unsmoothed shape (a shape that is not peak cut). That is, the energizing roll surface only needs to have a predetermined roughness, and for example, any shape that does not smooth the tip shape of the convex portion of the energizing roll surface by peak cutting or the like may be used. When the tip shape of the convex portion is smoothed (see FIG. 3A), current is passed through the plating solution. And the water film of a plating solution is made between a steel plate and an electricity supply roll, and slip may generate | occur | produce with this water film. On the other hand, when the tip shape of the convex portion is not smoothed, it is directly energized from the energizing roll (see FIG. 3B). For this reason, in this invention, it is preferable that the front-end | tip shape of a convex part is an unsmoothed shape. In addition, examples of the imparting of roughness include shot blasting.
通電ロールは、例えば、Ｃｒめっきや溶射を施した通電ロールを用いることができる。本発明において、通電ロール表面の仕様は、ロール再生費用の点から、Ｃｒめっきであることがより好ましい。 As the energizing roll, for example, an energizing roll subjected to Cr plating or thermal spraying can be used. In the present invention, the specification of the surface of the energizing roll is more preferably Cr plating from the viewpoint of roll regeneration cost.
本発明において、上記の条件を満たす通電ロールを用いて、鋼板を陰極として電気めっき処理を行う。電気めっき処理の条件としては、特に限定するものではないが、高電流で行うことが好ましい。また、電気めっき処理を行う冷延鋼板については、特に制限はなく、公知の方法により得られる冷延鋼板であればよい。 In the present invention, electroplating is performed using a steel sheet as a cathode, using an energizing roll that satisfies the above conditions. The conditions for the electroplating treatment are not particularly limited, but are preferably performed at a high current. Moreover, there is no restriction | limiting in particular about the cold rolled steel plate which performs an electroplating process, What is necessary is just a cold rolled steel plate obtained by a well-known method.
また、本発明は、電気ニッケルめっきや電気亜鉛めっき、電気銅めっきなど、いわゆる電気めっきであればいずれにも適合する。 Further, the present invention is suitable for any so-called electroplating such as electronickel plating, electrogalvanizing, and electrocopper plating.
本発明の実施例について説明する。 Examples of the present invention will be described.
以下の処理工程を行い、電気めっき鋼板を作製した。
冷延鋼板に対して、脱脂、酸洗の前処理を行った後、電気めっき鋼板製造ラインにより、以下の条件で電気めっき処理を行った。
めっき浴：Ｎｉめっき浴
ラインスピード：８００ｍｐｍ
電流密度：２〜２０Ａ／ｄｍ２
めっき付着量：４５〜９５ｇ／ｍ２
また、電気めっき処理には、表面をショットブラスト加工により表１に記載の表面粗さＲａ、ＰＰＩ（所定範囲内の凸部ピーク数）に加工した後、溶射またはＣｒめっき処理した通電ロールを用いた。通電ロール表面の保水量Ｓについては、上述した式（１）〜（６）を用いて算出した。また、通電ロール表面の粗さは粗さ計で測定し、Ｒｐｋ、Ｒｋ、Ｒｖｋ、Ｍｒ１、Ｍｒ２を求めることにより、保水量Ｓを算出した。なお、保水量Ｓの算出において、測定距離Ｌは、粗さ計の測定長さである４ｍｍとした。
The following processing steps were performed to produce an electroplated steel sheet.
After pre-treatment of degreasing and pickling on the cold-rolled steel sheet, the electroplating process was performed under the following conditions using an electroplated steel sheet production line.
Plating bath: Ni plating bath Line speed: 800 mpm
Current density: 2-20 A / dm 2
Plating adhesion amount: 45 to 95 g / m 2
In addition, the electroplating process uses a current-carrying roll that has been subjected to thermal spraying or Cr plating after the surface has been processed into a surface roughness Ra and PPI (the number of convex portions within a predetermined range) shown in Table 1 by shot blasting. It was. About the water retention amount S of the electricity supply roll surface, it computed using Formula (1)-(6) mentioned above. Further, the roughness of the energizing roll surface was measured with a roughness meter, and the water retention amount S was calculated by determining Rpk, Rk, Rvk, Mr1, and Mr2. In the calculation of the water retention amount S, the measurement distance L was 4 mm, which is the measurement length of the roughness meter.
電気めっき処理時のスリップ発生、および、アークスポット発生について調べた。
（１）スリップ発生
スリップ発生については、スリップ発生の有無は、通電開始時のライン速度と、通電後のライン速度との差（変動値）を調べた。ライン速度は、通電ロールの回転数から算出した。基準は以下の通りである。○、△を合格とする。
○：１００ｍｐｍ以下
△：１００ｍｐｍ超え３００ｍｐｍ未満
×：３００ｍｐｍ以上
（２）アークスポット発生
めっき鋼板と通電ロールとの間で発生するアークスポットを原因とする、通電ロール表面の疵について調べた。具体的には、ライン出側で表面検査装置を用いて、アークスポット痕の有無を調べた。基準は以下の通りである。○、△を合格とする。
○：アークスポット痕無し
×：アークスポット痕有り
結果を表２に示す。
Slip generation and arc spot generation during electroplating were investigated.
(1) Slip occurrence Regarding the occurrence of slip, the presence / absence of slip occurrence was determined by examining the difference (variation value) between the line speed at the start of energization and the line speed after energization. The line speed was calculated from the number of rotations of the energizing roll. The criteria are as follows. ○ and △ are acceptable.
○: 100 mpm or less Δ: More than 100 mpm and less than 300 mpm x: 300 mpm or more (2) Arc spot generation The wrinkles on the surface of the energizing roll caused by the arc spot generated between the plated steel sheet and the energizing roll were examined. Specifically, the presence or absence of arc spot marks was examined using a surface inspection device on the line exit side. The criteria are as follows. ○ and △ are acceptable.
○: No arc spot trace ×: Arc spot trace The results are shown in Table 2.
発明例であるＮｏ．１、２は、スリップ発生およびアークスポット発生が合格基準を満たし、歩留まりの増加により、生産量、原単位が向上した。一方、比較例のＮｏ．３はスリップおよびアークスポットが発生し、歩留まりの低下により、生産量、原単位が向上した。 Inventive example No. In Nos. 1 and 2, slip generation and arc spot generation met the acceptance criteria, and the yield and basic unit improved due to the increase in yield. On the other hand, no. In No. 3, slips and arc spots occurred, and the yield and basic unit were improved due to a decrease in yield.
１ 鋼板
２ めっき液
３ 通電ロール表面
1
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| JPS5343632A (en) * | 1976-10-04 | 1978-04-19 | Toyo Kohan Co Ltd | Method of preventing arc spot |
| JPS5824514B2 (en) * | 1978-12-22 | 1983-05-21 | 新日本製鐵株式会社 | Current roll for electroplating |
| JPH01129996A (en) * | 1987-11-16 | 1989-05-23 | Kawasaki Steel Corp | Conductor roll |
| JPH0739918A (en) * | 1993-07-26 | 1995-02-10 | Nittetsu Hard Kk | Process roll of constant friction and hard-to-adhesion of foreign matter |
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