JP2020158875A - Production equipment of alloyed hot dip galvannealed steel sheet and production method of alloyed hot dip galvannealed steel sheet - Google Patents
Production equipment of alloyed hot dip galvannealed steel sheet and production method of alloyed hot dip galvannealed steel sheet Download PDFInfo
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Abstract
Description
本発明は、合金化溶融亜鉛めっき鋼板の製造設備および合金化溶融亜鉛めっき鋼板の製造方法に関する。本発明は、特に、自動車、家庭電気製品、建築材等に使用される合金化溶融亜鉛めっき鋼板の製造設備および前記合金化溶融亜鉛めっき鋼板の製造方法に関する。 The present invention relates to a manufacturing facility for an alloyed hot-dip galvanized steel sheet and a method for manufacturing an alloyed hot-dip galvanized steel sheet. The present invention particularly relates to a manufacturing facility for an alloyed hot-dip galvanized steel sheet used for automobiles, household electric appliances, building materials, etc., and a method for manufacturing the alloyed hot-dip galvanized steel sheet.
合金化溶融亜鉛めっき鋼板は、自動車、家庭電気製品、建築材等の素材として広く使用されている。かかる合金化溶融亜鉛めっき鋼板において、鋼板表面に凹凸欠陥が存在すると、当該凹凸欠陥は、鋼板のプレス成型時により顕著となり、塗装後にも解消されることがない。そのため、非常に厳格な表面品質が要求される用途、例えば自動車外板などの用途に用いられる場合、鋼板表面の凹凸欠陥が特に問題となる。 Alloyed hot-dip galvanized steel sheets are widely used as materials for automobiles, household electric appliances, building materials, and the like. In such an alloyed hot-dip galvanized steel sheet, if unevenness defects are present on the surface of the steel sheet, the unevenness defects become more prominent during press molding of the steel sheet and are not eliminated even after painting. Therefore, when it is used in an application that requires very strict surface quality, for example, an automobile outer panel, unevenness defects on the surface of the steel sheet become a particular problem.
このような凹凸欠陥の発生メカニズムとして、主に下記のようなものが挙げられる。
（１）冷間圧延時のワークロール表面の凹みが鋼板へ転写し、冷間圧延後の鋼板表面に凹凸欠陥が発生する（ロール起因の母板凹み）。
（２）めっき、合金化後に、調質圧延を施す際、調質圧延時のワークロール表面の凹みが鋼板へ転写し、調質圧延後の鋼板表面に凹凸欠陥が発生する（ロール起因のめっき・母板凹み）。
（３）熱延性スケールや成分の偏析が存在することにより（図３（ａ））、めっき時に鋼板表面にＡｌ富化層が十分に形成されない箇所が局所的に生じ（図３（ｂ））、当該箇所で激しくＦｅとＺｎが合金化反応するアウトバースト反応が顕著に進んだ結果、めっき厚が厚く付着し（図３（ｃ））、その後、調質圧延時にめっきが押し込まれ、凹凸欠陥が発生する（図３（ｄ））。
The following are mainly examples of the mechanism of occurrence of such unevenness defects.
(1) The dent on the surface of the work roll during cold rolling is transferred to the steel sheet, and unevenness defects occur on the surface of the steel sheet after cold rolling (the dent on the mother plate due to the roll).
(2) When temper rolling is performed after plating and alloying, the dents on the surface of the work roll during temper rolling are transferred to the steel sheet, and uneven defects occur on the surface of the steel sheet after temper rolling (plating caused by rolls).・ Mother plate dent).
(3) Due to the presence of the hot-rolling scale and segregation of components (FIG. 3 (a)), a portion where the Al-enriched layer is not sufficiently formed on the surface of the steel sheet during plating locally occurs (FIG. 3 (b)). As a result of the outburst reaction in which Fe and Zn are violently alloyed at the relevant location, the plating thickness adheres thickly (Fig. 3 (c)), and then the plating is pushed in during temper rolling, resulting in uneven defects. Occurs (FIG. 3 (d)).
図２は、従来の合金化溶融亜鉛めっき鋼板の製造設備を示す概略構成図である。図２に示す合金化溶融亜鉛めっき鋼板の製造設備は、亜鉛めっき浴で溶融亜鉛めっきした鋼板に合金化処理を施す合金化炉と、調質圧延機とを備えている。そして、前記調質圧延機で調質圧延した後の鋼板の性状を、前記調質圧延機の下流側に配置した欠陥検査装置、検査室で検査し、製品の合否を判定している。また、上記のような凹凸欠陥を検出する方法として、前記検査室で鋼板に砥石掛けを行い、凹部や平滑部（正常部）に比べて凸部がより砥石で研磨されることで鋼板表面の凹凸を際立たせて凹凸欠陥を検出する方法も併せて行われている。 FIG. 2 is a schematic configuration diagram showing a conventional production facility for an alloyed hot-dip galvanized steel sheet. The manufacturing facility for the hot-dip galvanized steel sheet shown in FIG. 2 is equipped with an alloying furnace for alloying the hot-dip galvanized steel sheet in a galvanizing bath and a tempering rolling mill. Then, the properties of the steel sheet after temper rolling with the temper rolling mill are inspected by a defect inspection device and an inspection room arranged on the downstream side of the temper rolling mill to determine the pass / fail of the product. Further, as a method for detecting unevenness defects as described above, the steel sheet is ground with a grindstone in the inspection room, and the convex portion is polished with a grindstone more than the concave portion and the smooth portion (normal portion), so that the surface of the steel plate is polished. A method of detecting unevenness defects by making unevenness stand out is also performed.
一方、凹凸欠陥に対する品質対策として、特許文献１では、冷間圧延鋼板に再結晶温度以上で第１焼鈍処理を施し、さらに圧下率０．８〜２．０％の圧下を施したのち第２焼鈍処理を施し、ついで溶融亜鉛めっきと合金化処理を施す方法が提案されているが、これは冷間圧延による凹凸欠陥、すなわち上述の（１）のメカニズムによる凹凸欠陥を解決しようとするものである。 On the other hand, as a quality measure against uneven defects, in Patent Document 1, the cold-rolled steel sheet is first annealed at a temperature equal to or higher than the recrystallization temperature, and further reduced to a reduction rate of 0.8 to 2.0%, and then the second. A method has been proposed in which annealing treatment is performed, and then hot dip galvanizing and alloying treatment are performed, but this is an attempt to solve uneven defects due to cold rolling, that is, uneven defects due to the mechanism (1) described above. is there.
また、特許文献２では、熱間圧延時の脱スケール性を改善することで冷間圧延鋼板の表面性状を良好に保ち、均一な合金相を形成する方法が提案されている。これはめっき後のアウトバースト反応起因による凹凸欠陥に対する改善提案、すなわち上述の（３）のメカニズムによる凹凸欠陥を解決しようとするものである。特許文献２に記載の方法は、めっき前の鋼板状態を改善することに注目している。しかし、この方法では局所的な凹凸欠陥の発生を完全に抑制することは困難である。 Further, Patent Document 2 proposes a method of maintaining good surface properties of a cold-rolled steel sheet and forming a uniform alloy phase by improving the descalability during hot rolling. This is an attempt to improve the unevenness defect caused by the outburst reaction after plating, that is, to solve the unevenness defect caused by the mechanism (3) described above. The method described in Patent Document 2 focuses on improving the state of the steel sheet before plating. However, it is difficult to completely suppress the occurrence of local unevenness defects by this method.
本発明は、めっきおよび当該めっき後の合金化処理に起因する鋼板表面の凹凸欠陥を解消できる合金化溶融亜鉛めっき鋼板の製造設備および合金化溶融亜鉛めっき鋼板の製造方法を提供することを目的とする。 An object of the present invention is to provide a manufacturing facility for an alloyed hot-dip galvanized steel sheet and a method for manufacturing an alloyed hot-dip galvanized steel sheet, which can eliminate uneven defects on the surface of the steel sheet due to plating and the alloying treatment after the plating. To do.
本発明は、前記課題を解決するために、めっきおよび合金化処理後に鋼板表面の凸状欠陥を検出する凸状欠陥検査装置を設け、凸状欠陥を検出した場合、凸状欠陥平滑化装置で凸状欠陥を平滑化処理するものである。これにより、その後の調質圧延による厚めっき部（凸部）の母材への押し込みがなくなる。 In order to solve the above problems, the present invention provides a convex defect inspection device for detecting convex defects on the surface of a steel sheet after plating and alloying treatment, and when a convex defect is detected, the convex defect smoothing device is used. This is for smoothing convex defects. As a result, the thick-plated portion (convex portion) is not pushed into the base metal by the subsequent temper rolling.
本発明は、以下の構成を有する。
［１］溶融亜鉛めっきした鋼帯に合金化処理を施す合金化炉と、前記合金化炉で合金化処理を施した鋼板に調質圧延を施す調質圧延機とを備える合金化溶融亜鉛めっき鋼板の製造設備であって、
前記合金化炉と前記調質圧延機との間に、
前記合金化炉で合金化処理を施した鋼板表面の凸状欠陥を検出する凸状欠陥検査装置と、前記凸状欠陥検査装置で検出した鋼板表面の凸状欠陥を平滑化処理する凸状欠陥平滑化装置とを配置してなる、合金化溶融亜鉛めっき鋼帯の製造設備。
［２］溶融亜鉛めっきした鋼板に合金化処理を施し、
次いで、前記合金化処理を施した鋼板表面の凸状欠陥を検出し、
前記検出した鋼板表面の凸状欠陥を平滑化処理した後に、調質圧延を行う、合金化溶融亜鉛めっき鋼板の製造方法。
The present invention has the following configurations.
[1] Alloyed hot-dip zinc plating including an alloying furnace for alloying a steel strip plated with hot-dip zinc and a tempering rolling mill for making a temper-rolling a steel plate which has been alloyed with the alloying furnace. It is a steel sheet manufacturing facility
Between the alloying furnace and the temper rolling mill,
A convex defect inspection device that detects convex defects on the surface of a steel sheet that has been alloyed in the alloying furnace, and a convex defect that smoothes the convex defects on the surface of the steel sheet detected by the convex defect inspection device. A facility for manufacturing alloyed hot-dip galvanized steel strips, which is equipped with a smoothing device.
[2] Hot-dip galvanized steel sheet is alloyed and then alloyed.
Next, a convex defect on the surface of the steel sheet subjected to the alloying treatment was detected.
A method for producing an alloyed hot-dip galvanized steel sheet, in which the detected convex defects on the surface of the steel sheet are smoothed and then tempered and rolled.
本発明によれば、めっきおよび当該めっき後の合金化処理に起因する鋼板表面の凹凸欠陥を解消できる合金化溶融亜鉛めっき鋼板の製造設備および合金化溶融亜鉛めっき鋼板の製造方法を提供することができる。
すなわち、本発明によれば、上述の（３）のメカニズムにより発生する鋼板表面の凹凸欠陥を解消することが可能となる。
According to the present invention, it is possible to provide a manufacturing facility for an alloyed hot-dip galvanized steel sheet and a method for manufacturing an alloyed hot-dip galvanized steel sheet that can eliminate uneven defects on the surface of the steel sheet due to plating and the alloying treatment after the plating. it can.
That is, according to the present invention, it is possible to eliminate the unevenness defect on the surface of the steel sheet generated by the mechanism (3) described above.
本発明によれば、合金化処理後に鋼板表面に局所的に発生した凹凸欠陥を、調質圧延前に解消することができる。そして、凹凸欠陥が解消された鋼板を調質圧延することで、表面品質に優れる合金化溶融亜鉛めっき鋼板を生産性高く製造することができる。 According to the present invention, unevenness defects locally generated on the surface of the steel sheet after the alloying treatment can be eliminated before temper rolling. Then, by temper rolling the steel sheet in which the unevenness defect is eliminated, an alloyed hot-dip galvanized steel sheet having excellent surface quality can be manufactured with high productivity.
以下、本発明の一実施形態について、図面を参照しながら説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
図１は、本発明の一実施形態にかかる合金化溶融亜鉛めっき鋼板の製造設備を示す概略構成図である。 FIG. 1 is a schematic configuration diagram showing a manufacturing facility for an alloyed hot-dip galvanized steel sheet according to an embodiment of the present invention.
図１に示すように、本実施形態の合金化溶融亜鉛めっき鋼板の製造設備は、鋼板の通板方向で上流側から下流側に向かって、亜鉛めっき浴、合金化炉、調質圧延機をこの順に備え、さらに、前記合金化炉と前記調質圧延機との間に、凸状欠陥検査装置と凸状欠陥平滑化装置とを備える。なお、本実施形態では、上流側から、凸状欠陥検査装置と凸状欠陥平滑化装置がこの順に個別に配置されているが、これに限定されず、例えば凸状欠陥検査装置と凸状欠陥平滑化装置とが一体化されていてもよい。 As shown in FIG. 1, the manufacturing equipment for the alloyed hot-dip galvanized steel sheet of the present embodiment includes a galvanized bath, an alloying furnace, and a tempering rolling mill from the upstream side to the downstream side in the sheet passing direction of the steel sheet. In this order, a convex defect inspection device and a convex defect smoothing device are further provided between the alloying furnace and the temper rolling mill. In the present embodiment, the convex defect inspection device and the convex defect smoothing device are individually arranged in this order from the upstream side, but the present invention is not limited to this, and for example, the convex defect inspection device and the convex defect smoothing device are arranged. The smoothing device may be integrated.
また、図１に示す製造設備のように、本発明の合金化溶融亜鉛めっき鋼板の製造設備は、亜鉛めっき浴の上流側に焼鈍炉、調質圧延機の下流側に欠陥検査装置、検査室を備えてもよく、さらにこれら以外の付帯装置を備えてもよい。 Further, as in the manufacturing facility shown in FIG. 1, the manufacturing facility for the alloyed hot-dip galvanized steel sheet of the present invention has an annealing furnace on the upstream side of the galvanized bath, a defect inspection device and an inspection room on the downstream side of the tempering rolling mill. May be provided, and ancillary devices other than these may be further provided.
本発明の合金化溶融亜鉛めっき鋼板の製造設備に供される鋼板（母材）としては、冷延鋼板が挙げられる。前記冷延鋼板としては、特に限定されないが、本発明の効果をより享受できる点から、自動車外板用の冷延鋼板が好ましい。特に、引張強さ（ＴＳ）が２７０〜４４０ＭＰａ級の冷延鋼板が好ましい。また、板厚０．５〜１．０ｍｍの冷延鋼板が好ましい。 Examples of the steel sheet (base material) used in the manufacturing equipment for the alloyed hot-dip galvanized steel sheet of the present invention include cold-rolled steel sheets. The cold-rolled steel sheet is not particularly limited, but a cold-rolled steel sheet for an automobile outer panel is preferable from the viewpoint of further enjoying the effects of the present invention. In particular, a cold-rolled steel sheet having a tensile strength (TS) of 270 to 440 MPa is preferable. Further, a cold-rolled steel sheet having a plate thickness of 0.5 to 1.0 mm is preferable.
本実施形態の製造設備により、合金化溶融亜鉛めっき鋼板を製造する際には、上記のような鋼板（母材）を入側から通板し、焼鈍炉で適宜に焼鈍を施した後、亜鉛めっき浴中に浸漬して溶融亜鉛めっきを施し、次いで、溶融亜鉛めっきした鋼板に、合金化炉で合金化処理を施す。 When manufacturing an alloyed hot-dip galvanized steel sheet by the manufacturing equipment of the present embodiment, the steel sheet (base material) as described above is passed through from the inlet side, appropriately annealed in an annealing furnace, and then zinc. It is immersed in a plating bath to be hot-dip galvanized, and then the hot-dip galvanized steel sheet is alloyed in an alloying furnace.
この際、上述したように、めっき時に鋼板表面にＡｌ富化層が十分に形成されない箇所が生じると、合金化処理時に当該箇所でアウトバースト反応が進行し、鋼板表面に局所的に凹凸欠陥が発生する。この状態で、調質圧延機による調質圧延を施すと、厚めっき部（凸部）が母材に押し込まれ、凹凸欠陥発生の原因となる。 At this time, as described above, if a portion where the Al-enriched layer is not sufficiently formed on the surface of the steel sheet occurs during plating, the outburst reaction proceeds at the portion during the alloying treatment, and unevenness defects are locally formed on the surface of the steel sheet. appear. If temper rolling is performed by a temper rolling mill in this state, the thick-plated portion (convex portion) is pushed into the base metal, which causes unevenness defects.
本発明では、合金化炉と調質圧延機との間に、鋼板表面の凸状欠陥を検出する凸状欠陥検査装置と、鋼板表面の凸状欠陥を平滑化処理する凸状欠陥平滑化装置とを配置している。そして、めっきおよび当該めっき後の合金化処理に起因して鋼板表面に局所的に発生した凹凸欠陥を、前記凸状欠陥検査装置により検出し、検出した凸状欠陥を前記凸状欠陥平滑化装置で平滑化処理する。これにより、調質圧延前に、めっきおよび当該めっき後の合金化処理に起因して鋼板表面に局所的に発生した凹凸欠陥を解消できる。そして、前記凹凸欠陥が解消された鋼板を調質圧延することで、厚めっき部が母材へ押し込まれることがなくなり、凹凸欠陥の発生が抑制された表面品質に優れる合金化溶融亜鉛めっき鋼板を製造することができる。 In the present invention, a convex defect inspection device for detecting convex defects on the surface of a steel sheet and a convex defect smoothing device for smoothing the convex defects on the surface of a steel sheet between an alloying furnace and a tempering rolling mill. And are arranged. Then, the convex defect inspection device detects uneven defects locally generated on the surface of the steel sheet due to the plating and the alloying treatment after the plating, and the detected convex defects are detected by the convex defect smoothing device. Smoothing with. As a result, it is possible to eliminate unevenness defects locally generated on the surface of the steel sheet due to the plating and the alloying treatment after the plating before the temper rolling. Then, by temper rolling the steel sheet in which the unevenness defects have been eliminated, the thick plated portion is not pushed into the base material, and the alloyed hot-dip galvanized steel sheet having excellent surface quality in which the occurrence of unevenness defects is suppressed is obtained. Can be manufactured.
なお、凸状欠陥平滑化装置による鋼板表面の平滑化処理は、鋼板表面の全体に施す必要はなく、凸状欠陥検査装置で検出した凸状欠陥が存在する領域のみを平滑化処理すればよい。すなわち、本発明によれば、凹凸欠陥が存在する領域のみを局所的に平滑化処理することができる。これにより、合金化処理後に発生した鋼板表面の凹凸欠陥を効率的に解消することができ、その結果、凹凸欠陥の発生が抑制された表面品質に優れる合金化溶融亜鉛めっき鋼板を生産性高く製造することができる。 It is not necessary to perform the smoothing treatment on the surface of the steel sheet by the convex defect smoothing device on the entire surface of the steel sheet, and it is sufficient to smooth only the region where the convex defects detected by the convex defect inspection device are present. .. That is, according to the present invention, only the region where the unevenness defect exists can be locally smoothed. As a result, uneven defects on the surface of the steel sheet generated after the alloying process can be efficiently eliminated, and as a result, alloyed hot-dip galvanized steel sheets with excellent surface quality in which the occurrence of uneven defects is suppressed can be manufactured with high productivity. can do.
上記凸状欠陥検査装置としては、特に限定されず、鋼板表面の凸状欠陥を検出可能な表面検査装置を用いることができる。なお、凸状欠陥検査装置としては、例えば鋼板への光源と鋼板からの反射光を観察するＣＣＤカメラを用いて、観察される明暗および明暗の形状等の特徴量から凹凸を判別する検査装置や、鋼板近傍で磁力を流し、磁気抵抗が増える鋼板凹凸部で磁束が鋼板外部へ漏洩し、その漏洩磁束を検出する検査装置などが例示される。また、上記凸状欠陥平滑化装置も、特に限定されず、鋼板表面の凸状欠陥を平滑化可能な平滑化装置を用いることができる。このような凸状欠陥平滑化装置としては、例えば、グラインダー、レーザー等が挙げられる。 The convex defect inspection device is not particularly limited, and a surface inspection device capable of detecting convex defects on the surface of the steel sheet can be used. As the convex defect inspection device, for example, an inspection device that uses a light source on the steel plate and a CCD camera for observing the reflected light from the steel plate to discriminate unevenness from the observed features such as light and dark and the shape of light and dark. Examples thereof include an inspection device in which a magnetic force is applied in the vicinity of a steel sheet and magnetic flux leaks to the outside of the steel sheet at an uneven portion of the steel sheet where magnetic resistance increases, and the leaked magnetic flux is detected. Further, the convex defect smoothing device is not particularly limited, and a smoothing device capable of smoothing convex defects on the surface of the steel sheet can be used. Examples of such a convex defect smoothing device include a grinder, a laser, and the like.
本発明において、凸状欠陥とはめっき層表面が周囲（正常部）に比べて凸状に盛り上がった欠陥部を指す。なお、前記凸状欠陥の高さが鋼板粗さ（約０．５〜２．０μｍ）より高い３μｍ以上であるとプレス成形後、あるいは塗装後の表面品質に悪影響をおよぼす。 In the present invention, the convex defect refers to a defect portion in which the surface of the plating layer is convexly raised with respect to the surroundings (normal portion). If the height of the convex defect is 3 μm or more, which is higher than the steel plate roughness (about 0.5 to 2.0 μm), the surface quality after press forming or painting is adversely affected.
凸状欠陥検査装置の検出結果を受けて、凸状欠陥平滑化装置で平滑化処理する方法は、特に限定されないが、例えば、グラインダーを用いる場合には、凸状欠陥検査装置で検出した凸状欠陥の存在する板幅方向位置にグラインダーを移動させ、前記凸状欠陥を研削可能となったところで、前記凸状欠陥にグラインダーの研削部（研削砥石）を接触させて前記凸状欠陥を研削する方法が挙げられる。また、複数のグラインダーを鋼板の板幅方向に配置しておき、前記凸状欠陥の存在する板幅方向位置に対応する位置に配置したグラインダーの研削部を、前記凸状欠陥を研削可能となったところで、前記凸状欠陥に接触させて前記凸状欠陥を研削する方法としてもよい。凸状欠陥平滑化装置としてレーザーを用いる場合も同様とすることができる。なお、レーザーを用いる場合、凸状欠陥にレーザー光を照射することで、前記凸状欠陥を溶融平滑化処理する。また、凸状欠陥検査装置による凸状欠陥の検出と、凸状欠陥平滑化装置による凸状欠陥の平滑化処理は、鋼板を通板しながら実施することが好ましいが、鋼板の通板速度を低下させて実施したり、通板を一時的に停止して実施することも任意である。 The method of smoothing with the convex defect smoothing device based on the detection result of the convex defect inspection device is not particularly limited. For example, when a grinder is used, the convex shape detected by the convex defect inspection device is used. When the grinder is moved to a position in the plate width direction where the defect exists and the convex defect can be ground, the grinding portion (grinding grindstone) of the grinder is brought into contact with the convex defect to grind the convex defect. The method can be mentioned. Further, a plurality of grinders are arranged in the plate width direction of the steel plate, and the grinding portion of the grinder arranged at a position corresponding to the position in the plate width direction in which the convex defect exists can grind the convex defect. At that point, a method of grinding the convex defect by contacting it with the convex defect may be used. The same can be applied when a laser is used as the convex defect smoothing device. When a laser is used, the convex defects are melt-smoothed by irradiating the convex defects with laser light. Further, the detection of the convex defect by the convex defect inspection device and the smoothing process of the convex defect by the convex defect smoothing device are preferably performed while passing the steel plate, but the passing speed of the steel plate is increased. It is also optional to lower the speed and temporarily stop the passing plate.
また、予め、鋼板の材質、機械的特性、用途や、調質圧延の圧下率等に応じて、合金化処理後に鋼板表面に存在する凸状欠陥の高さと、最終製品の表面品質との関係を把握しておくこと等により、凸状欠陥検査装置で検出した凸状欠陥について、平滑化処理を実施するものと、平滑化処理を実施しなくてよいものとを判別することもできる。例えば、凸状欠陥検査装置で凸状欠陥を検出した場合であっても、当該凸状欠陥の高さが予め設定した高さ未満であり、当該凸状欠陥に対し平滑化処理を施さずにそのまま調質圧延しても最終製品の製品規格を満たし合格となるものであれば、当該凸状欠陥に対し平滑化処理を施さずにそのまま調質圧延を行ってもよい。このような製造方法とすれば、鋼板表面の平滑化処理をより効率的に実施することができ、最終製品（合金化溶融亜鉛めっき鋼板）の生産性がより高められる。 In addition, the relationship between the height of convex defects existing on the surface of the steel sheet after alloying treatment and the surface quality of the final product is determined in advance according to the material, mechanical properties, application, rolling rolling reduction, etc. of the steel sheet. It is also possible to discriminate between those that perform the smoothing process and those that do not need to perform the smoothing process for the convex defects detected by the convex defect inspection apparatus. For example, even when a convex defect is detected by a convex defect inspection device, the height of the convex defect is less than a preset height, and the convex defect is not smoothed. Even if the temper rolling is performed as it is, if the product standard of the final product is satisfied and the product is acceptable, the temper rolling may be performed as it is without smoothing the convex defect. According to such a manufacturing method, the smoothing treatment of the surface of the steel sheet can be carried out more efficiently, and the productivity of the final product (alloyed hot-dip galvanized steel sheet) can be further improved.
上記のような平滑化処理が施された鋼板に対して、その後、調質圧延を施す。調質圧延は、従来と同様の条件で実施すればよく、一例として、圧下率０．５〜２．０％程度の調質圧延を施すことができる。調質圧延後の鋼板は、欠陥検査装置、検査室で最終の検査が行われ合否の判定が行われる。 The steel sheet that has been smoothed as described above is then temper-rolled. The temper rolling may be carried out under the same conditions as in the conventional case, and as an example, temper rolling with a reduction ratio of about 0.5 to 2.0% can be performed. The steel sheet after temper rolling is finally inspected by a defect inspection device and an inspection room, and a pass / fail judgment is made.
以上、説明したとおり、本発明によれば、めっきおよび当該めっき後の合金化処理に起因する鋼板表面の凹凸欠陥を解消できる合金化溶融亜鉛めっき鋼板の製造設備および合金化溶融亜鉛めっき鋼板の製造方法を提供することができる。
本発明によれば、合金化処理後に鋼板表面に局所的に発生した凹凸欠陥を、調質圧延前に、より確実に解消することができる。そして、凹凸欠陥が解消された鋼板を調質圧延することで、表面品質に優れる合金化溶融亜鉛めっき鋼板を生産性高く製造することができる。特に、厳格な表面品質が求められる自動車外板用の合金化溶融亜鉛めっき鋼板を製造する際に本発明を適用することが好ましい。
As described above, according to the present invention, a manufacturing facility for an alloyed hot-dip galvanized steel sheet and a manufacturing for an alloyed hot-dip galvanized steel sheet that can eliminate uneven defects on the surface of the steel sheet due to plating and the alloying treatment after the plating. A method can be provided.
According to the present invention, unevenness defects locally generated on the surface of the steel sheet after the alloying treatment can be more reliably eliminated before temper rolling. Then, by temper rolling the steel sheet in which the unevenness defect is eliminated, an alloyed hot-dip galvanized steel sheet having excellent surface quality can be manufactured with high productivity. In particular, it is preferable to apply the present invention when manufacturing an alloyed hot-dip galvanized steel sheet for automobile outer panels, which requires strict surface quality.
以下、本発明を実施例により説明するが、本発明はこれに限定されるものではない。 Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited thereto.
図２に示す合金化溶融亜鉛めっき鋼板の製造設備により、自動車外板用の合金化溶融亜鉛めっき鋼板を１００００ｔｏｎ製造したところ、製品歩留まりは９０％であった（従来例）。 When 10,000 tons of alloyed hot-dip galvanized steel sheet for automobile outer panels were manufactured by the alloying hot-dip galvanized steel sheet manufacturing facility shown in FIG. 2, the product yield was 90% (conventional example).
上記において不合格となった製品を検査し、母材に対するめっきの押込みの高さから、合金化処理後に発生する凸状欠陥のうち３μｍ以上の高さの凸状欠陥を平滑化処理するように設定し、図１に示す合金化溶融亜鉛めっき鋼板の製造設備により、自動車外板用の合金化溶融亜鉛めっき鋼板を製造した。 Inspect the products that failed in the above, and smooth the convex defects with a height of 3 μm or more among the convex defects generated after the alloying treatment from the height of the plating indentation against the base metal. The alloyed hot-dip galvanized steel sheet for the outer panel of an automobile was manufactured by the equipment for manufacturing the alloyed hot-dip galvanized steel sheet shown in FIG.
すなわち、本実施例では、図１に示した製造設備により、溶融亜鉛めっきした鋼帯に合金化炉で合金化処理を施した後、鋼板表面を凸状欠陥検査装置で検査し、検出した凸状欠陥のうち高さが３μｍ以上の凸状欠陥を、凸状欠陥平滑化装置で平滑化処理した後に、調質圧延を行い、自動車外板用の合金化溶融亜鉛めっき鋼板を１００００ｔｏｎ製造した。その結果、製品歩留りは９１％となった。なお、本実施例では凸状欠陥平滑化装置としてグラインダーを用いた。 That is, in this embodiment, the hot-dip galvanized steel strip is alloyed in an alloying furnace using the manufacturing equipment shown in FIG. 1, and then the surface of the steel sheet is inspected by a convex defect inspection device and detected. Convex defects having a height of 3 μm or more among the state defects were smoothed by a convex defect smoothing device and then tempered and rolled to produce 10000 tons of alloyed hot-dip galvanized steel sheets for automobile outer panels. As a result, the product yield was 91%. In this example, a grinder was used as the convex defect smoothing device.
Claims (2)
前記合金化炉と前記調質圧延機との間に、
前記合金化炉で合金化処理を施した鋼板表面の凸状欠陥を検出する凸状欠陥検査装置と、
前記凸状欠陥検査装置で検出した鋼板表面の凸状欠陥を平滑化処理する凸状欠陥平滑化装置とを配置してなる、合金化溶融亜鉛めっき鋼板の製造設備。 A facility for manufacturing alloyed hot-dip galvanized steel sheets, which comprises an alloying furnace for alloying a hot-dip galvanized steel sheet and a tempering rolling mill for performing temper rolling on a steel sheet alloyed in the alloying furnace. And
Between the alloying furnace and the temper rolling mill,
A convex defect inspection device that detects convex defects on the surface of a steel sheet that has been alloyed in the alloying furnace, and
A facility for manufacturing alloyed hot-dip galvanized steel sheets, which is provided with a convex defect smoothing device for smoothing convex defects on the surface of a steel sheet detected by the convex defect inspection device.
次いで、前記合金化処理を施した鋼板表面の凸状欠陥を検出し、
前記検出した鋼板表面の凸状欠陥を平滑化処理した後に、調質圧延を行う、合金化溶融亜鉛めっき鋼板の製造方法。 Hot-dip galvanized steel sheet is alloyed and
Next, a convex defect on the surface of the steel sheet subjected to the alloying treatment was detected.
A method for producing an alloyed hot-dip galvanized steel sheet, in which the detected convex defects on the surface of the steel sheet are smoothed and then tempered and rolled.
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