JPH03161103A - Steel sheet for coating - Google Patents
Steel sheet for coatingInfo
- Publication number
- JPH03161103A JPH03161103A JP1299842A JP29984289A JPH03161103A JP H03161103 A JPH03161103 A JP H03161103A JP 1299842 A JP1299842 A JP 1299842A JP 29984289 A JP29984289 A JP 29984289A JP H03161103 A JPH03161103 A JP H03161103A
- Authority
- JP
- Japan
- Prior art keywords
- flat
- peak
- valley
- mountain
- parts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 22
- 239000010959 steel Substances 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title abstract description 26
- 239000011248 coating agent Substances 0.000 title abstract description 20
- 230000003746 surface roughness Effects 0.000 claims abstract description 4
- 238000010422 painting Methods 0.000 claims description 22
- 238000005096 rolling process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000003973 paint Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 206010041235 Snoring Diseases 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009760 electrical discharge machining Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241000473391 Archosargus rhomboidalis Species 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/227—Surface roughening or texturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分！！Ｆ＞
木発門は、自仙車ボディ外板や家庭電気製品外装仮の如
く、プレス加工等の威形加工を施して使用される塗装用
Ｍ仮に関するものであり、″持に塗装朕厚の薄いｌコー
１・及び２コート用途に適した塗装用鋼仮に関するもの
である。[Detailed description of the invention] <Industrial use! ! F> Kibatsumon is related to M-temporary paint used for painting, such as the outer panels of the body of a JIsen car or the exterior of household electrical appliances, after being processed to give it an imposing shape such as press working. The present invention relates to a steel temporary coating suitable for use in thin 1- and 2-coat applications.
〈従来の技術〉
従来、自動車２１サディ外仮や家庭電気製品外装仮に要
求される素材の仮面特性は、威形時の焼付防止のために
適度な表面ネ■さが付与されていることのみであったが
、最近の高級化指向に｛゛１コい、該用途における塗装
後鼾映性の向上を目的として、ろ波中心線うねりｗｅａ
等で評価される塗装後の可映１生を悪化させる素材表面
の長波長うねり成分の低減も要求項目に加えられるよう
になりつつある．一般に、該用途のｓｋｉに供される薄
鋼板、例えば冷延薄鋼板は、冷間圧延後脱脂洗浄を行い
、更に焼鈍の後調質圧延を施して製造するのが通常であ
り、従来ｗ４仮表面への適度な粗度付与は、！Ｊｌｌ質
圧延において、ショットブラスト法もしくは放電加工法
によってダル仕上げされたロールを用いて軽度の圧延を
行うことによりなされていた．しかし、シジン１・ブラ
スト法や放電加工法では、ロール表面に形成されるプロ
フィールは不規則なため大きな長波長のうねり戒分を含
有しており、該ロールを川い゜ζ調質圧延された鋼板表
面には、ロールからの転写により長波長のうねりが生成
し、該ロールダル加工方法では塗装後鮮映性の良好なＲ
奢反は得難い．
このような車情のもとに、レーザ加工技術をロールダル
加工に応用し、ロール表面に規則正しくダル目を加工成
形することにより、ロール表面に所定の粗度を付与しな
がら長波長のうねり戊分を除去し、該ロールを用いてｊ
［？ｔ圧延を行うことにより、塗装後鮮映性に優れた鋼
板を製造する方法（例えば特開昭６２−１６８６０２号
公報参照）が提案されている．
く発明が解決しようとする！！１題〉
しかしこれらの技術では、塗装膜厚の比較的厚い、膜厚
≧１０ｎ程度の３コート以上の塗装では、非常に良好な
塗装後鮮映性が得られるものの、軽自動車ボディ外板や
家庭電気製品外装板等塗装膜厚の薄いｌコート及び２コ
ートの塗装では、塗装によって綱板表面のダル目が十分
に隠蔽されず、いわゆるダル目残りを生じ、鮮映性が著
しく低下するという欠点を有していた．
本発明は、このような問題を解決した塗装用鋼板を提供
することを目的とする。<Conventional technology> Conventionally, the only masking properties required for the exterior of automobiles and home appliances are that the material has an appropriate surface roughness to prevent seizure during display. However, with the recent trend towards high-end products, filtering center line waviness has been developed for the purpose of improving snoring properties after painting in this application.
Reduction of long-wavelength waviness components on the surface of materials, which deteriorate the visibility after painting, as evaluated by methods such as the above, is also being added to the requirements. In general, thin steel sheets used for skiing in this purpose, such as cold-rolled thin steel sheets, are usually manufactured by degreasing and cleaning after cold rolling, and then temper rolling after annealing. Appropriate roughness can be imparted to the surface! In Jll quality rolling, light rolling is performed using rolls that have been dull finished by shot blasting or electrical discharge machining. However, in the Shin-1 blasting method and electrical discharge machining method, the profile formed on the roll surface is irregular and contains large long-wavelength undulations, Long-wavelength undulations are generated on the surface of the steel plate due to transfer from the roll, and the roll dulling method produces R with good image clarity after painting.
Luxury is hard to come by. Based on these vehicle conditions, laser processing technology is applied to roll dull processing, and by processing and forming regular dowels on the roll surface, long wavelength waviness can be eliminated while imparting a predetermined roughness to the roll surface. Remove j and use the roll
[? A method of producing a steel plate with excellent image clarity after coating by performing t-rolling has been proposed (see, for example, Japanese Patent Application Laid-Open No. 168602/1983). A new invention tries to solve the problem! ! Problem 1> However, with these techniques, very good post-painting clarity can be obtained with relatively thick coatings of 3 or more coats with a coating thickness of approximately 10 nm, but they cannot be applied to light vehicle body exteriors or other coatings. When applying thin l-coat and 2-coat coatings on exterior panels of home appliances, etc., the coating does not sufficiently hide the dots on the surface of the steel plate, leaving so-called dots remaining, which significantly reduces image clarity. It had shortcomings. An object of the present invention is to provide a steel plate for painting that solves these problems.
く課題を解決するための手段〉
本発明は、以上に説明した、レーザパルス等の高密度エ
ネルギー源を利用して製作した、ロール表面の長波長う
ねり成分の非常に小さいロールを用いて圧延することに
よって得られた塗装後鮮映性に優れた鋼板の塗装欣厚の
薄い！コート及び２コート用途での塗装後のダル目残り
の問題を解決すべく、ダル目形状、ダル目深さ、仮面粗
度等について研究、検討を重ねた結果、ｌコート及び２
コート用途でも塗装後にダル目残りが生じず塗装後、鮮
映性が良好でかつプレス性等その他の特性も良好なｗ４
仮を得ることを可能にするものである．即ち本発明は、
鋼板表裏面の少なくとも片面の表面の中心線平均粗さＲ
ａが０．３〜２。ＯＩＩｍの範囲内にあり、かつその表
面粗さを構成する微視的形態が、平坦な山頂面を有する
台形状の山部と、その周囲の全部または一部を取囲むよ
うに形威された満状の谷部と、山部の間であってかつ谷
部の外側にその谷部より高くかつ山部の山頂面より低い
かまたは同じ高さに形成された中間平坦部によって構成
され、しかも隣合う山部の平均中心間距離をＳＬ１、谷
部の外縁の平均直径をＤ、山部の平坦な山頂面の平均直
往をｄ０、山部の山頂面と谷部の底との標高差をｉ、山
部の平坦な山頂面と前記中間平坦部の平坦面の面猜の和
が全面積に占める割合をη（％）と定義したとき、
０．５≦Ｓｗ＋／Ｄ≦２．０
Ｓ＋ｍ−Ｄ≦３００ｐ＋ｍ
ｄ６≦５００ ｐｍ
１ｐｓ≦ｌ≦１０μ醜
２０％≦η≦８５％
を満足するように＋ｉ戒されていることを特徴とする塗
装用ｔＲ仮である．
く作 川〉
高密度エネルギー源、例えばレーザを用いて加工された
ロールによるロール圧延機で冷間圧延されたｍ仮表面の
粗面の微視的形態例を第１、２図に示す．
微視的形態は、平坦な山頂面ｌを有する台形状の山部３
と、その周囲を取囲むように形威された連続溝状の谷部
４と、隣合う山部３の間であってかつ谷部−４の外側に
その谷部４の底よりも高くかつ山部３の山頂面ｌより低
いかまたは同じ高さに形成された中間平坦部２とによっ
て構成される．また、鯛仮表面の微視的形態を表す各部
の寸法を、第３、４図を参照して次のように定義する。Means for Solving the Problems> The present invention involves rolling using a roll with a very small long-wavelength waviness component on the roll surface, which is manufactured using a high-density energy source such as a laser pulse, as described above. As a result, the coating thickness of the steel plate with excellent image clarity after painting is thin! In order to solve the problem of residual dots remaining after coating in coat and 2-coat applications, we have repeatedly researched and considered the dot shape, dot depth, mask roughness, etc.
Even in coating applications, there is no residual dullness after painting, and the image clarity is good after painting, and other properties such as pressability are also good w4
This makes it possible to obtain tentative assumptions. That is, the present invention
Center line average roughness R of at least one surface of the front and back surfaces of the steel plate
a is 0.3-2. The microscopic morphology that is within the range of OIIm and that constitutes the surface roughness is shaped like a trapezoidal peak with a flat peak surface and surrounding all or part of the periphery. It is composed of a full valley and an intermediate flat part formed on the outside of the valley and higher than the valley and lower than or at the same height as the top surface of the peak, and SL1 is the average center-to-center distance between adjacent peaks, D is the average diameter of the outer edge of the valley, d0 is the average direct distance between the flat peak surfaces of the peaks, and the difference in elevation between the top surface of the peaks and the bottom of the valley. When i is defined as i, and the ratio of the sum of the surface area of the flat top surface of the mountain part and the flat surface of the intermediate flat part to the total area is defined as η (%), 0.5≦Sw+/D≦2.0 This is a tR tentative for painting characterized by +i precepts to satisfy the following: S+m-D≦300p+m d6≦500 pm 1ps≦l≦10μ Ugly 20%≦η≦85%. Kusaku Kawa> Figures 1 and 2 show examples of the microscopic morphology of the rough surface of a temporary surface cold-rolled in a roll mill using rolls processed using a high-density energy source, such as a laser. The microscopic form is a trapezoidal peak 3 with a flat peak surface l.
, a continuous groove-like trough 4 formed to surround the periphery, and a groove located between the adjacent ridges 3 and outside the trough 4, which is higher than the bottom of the trough 4. It is composed of an intermediate flat part 2 formed at a height lower than or at the same height as the top surface l of the mountain part 3. Further, the dimensions of each part representing the microscopic form of the temporary surface of the sea bream are defined as follows with reference to FIGS. 3 and 4.
ＳＩＩ ：隣合う山部３の平均中心間距離Ｄ ＝谷部４
の外縁の平均直径
ｄ０ ：山部３の平坦な山頂面ｌの平均直径ｌ ：山部
３の山頂面ｌと谷部４の底との標高差
η ：山部３の平坦な山頂面１の全面積に占める割合η
１と中間平坦部２の平坦面
の全面積に占める割合ηアの和
第１〜４図に示す＠視的形態を有する鋼板では、全面積
に占める平坦部の割合が大きい程塗装後の祥映値が向上
ずる性質を有している。しかしながらプレス性の観点か
らは、平坦部割合の増大に伴いプレス潤滑油を貯留し、
プレス時の鋼板と型との焼付を防止する役割を果たす谷
部の全面積に占める割合が低滅するため、平坦部の割合
はその下限を規制し、プレス性を１員なわない微視的形
態とする必要がある。SII: Average center-to-center distance D of adjacent peaks 3 = Valley 4
Average diameter of the outer edge d0 : Average diameter l of the flat top surface l of the mountain part 3 : Elevation difference η between the top surface l of the mountain part 3 and the bottom of the valley part 4 : Average diameter of the flat top surface 1 of the mountain part 3 Percentage of total area η
1 and the ratio of the flat surface of the intermediate flat part 2 to the total area ηA In steel plates having the @-view form shown in Figures 1 to 4, the larger the ratio of the flat part to the total area is, the more It has the property of improving the image value. However, from the viewpoint of pressability, as the proportion of flat areas increases, press lubricating oil is stored,
Since the ratio of the valleys to the total area, which plays a role in preventing seizure between the steel plate and the die during pressing, decreases, the ratio of the flat parts is limited to its lower limit, and the microscopic form that does not affect the pressability. It is necessary to do so.
また、ｌコート、２コートでも塗装後にダル目残りを生
じないようにするためには、山部３の山Ｔｎ面１と谷部
４の底との標品差ｌを極力低減する必要がある．しかし
、標高差ｌの低滅は谷部４のプレス潤滑浦の貯留能の低
下に通ずるため、標商差ｌについては、ダル目残りを防
止する意味での上限とともにプレス仙の確保を１１的と
してその下１１Ｊも規制する必要がある。In addition, in order to prevent the formation of dull marks after painting even with l coat and 2 coat, it is necessary to reduce the standard difference l between the crest Tn surface 1 of the ridge part 3 and the bottom of the trough part 4 as much as possible. ．． However, since a reduction in the elevation difference l will lead to a reduction in the storage capacity of the press lubricating well in the valley 4, the mark difference l should be set at an upper limit to prevent dull spots from remaining, and the press lubricant should be secured in 11 points. As such, it is necessary to also regulate 11J below.
以上のような考え方により、微視的形態を表す各部の寸
法等については以下の規制を加える必要がある．
Ｓ慣／Ｄは、’；ｍ／Ｄ＞１の場合には隣合う谷部が隔
れ、逆にＳｓ／Ｄ＜１の場合には隣合う谷部同士が互り
合う状態となる，Ｓｓ／Ｄが０．５未満となると、山ｍ
而１が隣り合う谷部４によってほぼ消失する結果、平Ｉ
Ｂ４部の割合が大きく低下し、良好な鼾映値が１１４ら
れなくなるため、Ｓｍ／Ｄは０．５以上とする．また、
３ｓ／Ｄが２．０を超えると、谷部４の割合が低減し、
非堂に焼付きが発生し易くなるため、Ｓｍ／Ｄは２．０
以下とする．焼付きの発生し易さに関与する寸法因子と
して、Ｓｍ／Ｄ以外に、隣合う谷部４の問隔Ｓｍ −Ｄ
、及び山部３の平坦な山頂面１の平均直径ｄ０それ自体
も大きな影響を及ぼす．
Ｓｓ−Ｄは、Ｓｍ．，Ｄの大きさに依らず３００ＪＩ１
１より大きくなると、隣り合う谷部４間に生成する中間
平坦部２の面積が非常に大きくなり、焼付きが発生し易
くなるため３００一以下とする．同様に、山部３の平坦
な山頂面ｌの平均直径ｄ０も、５００−を上回ると焼付
きが発生し易くなるため５００ｎ以下とする．
更に、以上の結果得られる平ｔｏ面が全面積に占める割
合ηについては、ηが２０％を下回ると良好な、鮮映値
が得られなくなるため２０％以上とし、逆にηが８５％
を上回ると焼付きが発生し易い状態となるため８５％以
下とする．
塗装膜屡の薄いｌコート及び２コートの塗装において、
塗装後のダル目残りを防止するためには、山部の山頂面
と谷部の底の標高差ｌを小さくする必要がある．そこで
本発明者等は、標高差ｌを種々変更した試験片を作成し
、これに膜厚約３０７Ｉｌｌの塗装を施し、目視で塗装
後のダル目残り状況を調査するとともに、焼付きｎの調
査を目的として同試験片のプレステストを行った結果、
標高差ｌは１０ｐＩｍ以下とすれば、塗装膜厚約３０四
の１コー１・においても目視では塗装後のダノレ目残り
は認められなくなること、及び標高差ｌをｌｔｌ−以上
とすれば通常のブレスｉ滑柚の付着状態下では焼付きは
発生しないことを見出した。従って、標高差ｌは１〜１
０μｍの範囲内とする．
その実験の一部の結果を第１表に示す．前述のように、
本発明では鋼板の相面を形成する微視的形態を規制する
ことが重要であるが、微視的形態だけでな＜ｍ仮表面の
マクロな粗さについても規制を行う必要がある．
即ち、微視的形態を前述のように規制しても、中心線平
均粗さＲａが２．０−を超えれば塗装の鮮映性が充分に
良好とならず、一方Ｒａが０．３＃ｆｉ未満ではプレス
加工において焼付が発生し易くなる．従ってＲａは０．
３〜２．０ｐｍの範囲内とする．また、ｌＯ点平均粗さ
ｎｚは、ｌＯｎを超えると塗装後のダル目残りが発生し
易くなるため１０ｎ以下とする．なお、１０点平均粗さ
Ｒ２は、中心線平均粗さＲａ及び標高差ｉを以上のよう
に規制すれば、自ずと決まる値である．
く実施例〉
素材ｆｌ４ＦＮとして、ＳＩ’ＣＥ相当の連続焼鈍法に
よる板厚０．８ｎｓの冷延鋼板を用いた．またＵＦ４質
圧延用ワークロールとして、高密度エネルギー源を用い
てダル加工を施したダルロールを用い、調質圧延伸び率
λが０．５〜１．５％の条件でｊａｉｌ質圧延を行った
．なお調質圧延では、ｉｌｉｆｆ圧延後の鋼板表面の１
０点平均粗さＲ２と山部の山頂面と谷部の底の標高差ｌ
を種々変更させることを目的として、ロールのダル加工
条件も種々変更した．上述のようにしてａ＋ｉｒ圧延し
た後の鋼仮表面のネＵ度フ゜ロフィノレは、Ｄ： ２０
Ｏｎ，Ｓｓ ｚ ３００ｕ、ｄ．夕ｌ５０−、Ｓｓ／Ｄ
た１．５、Ｓ−−Ｄた１００一、３．２ｐｍ≦ｌ≦２０
．５ｎ、２．ｈｌｌ≦Ｒｚ Ｓ１９．２一であった．
次いで、ｉＩＩ￥ｔ圧延後の各洞仮について次のような
条件で化成処理を行った．
処 理 剤：ディップ処理用細粒型リン酸塩系薬剤
ディップ条｛↑：４０℃×１２０秒
皮膜ｆｆｉ徹：２．３±０．２ ｇ／ｃｊ前 処 理：
脱脂、水洗、表面調整
後 処 理：水洗、純水洗、乾燥
化成処理後、次のような条件で１コート及び２コートの
塗装を施した．
塗装姿勢：水平塗装
下 塗 り：カチオンＥＤ塗料１８〜２０μ膳厚上
塗 り：トップコート３０〜３５Ｐａ厚なお、ｌコー
トでは下塗りを省略した．塗装後の塗膜表面について、
ＤＯｌ’？ＩＣＯＮメータによりＤｏｔ値の測定を行っ
た．その結果を第５、６図に示す．第５図は標高差ｌと
１コート、２コート後のＤｏｔ値との関係を示し、第６
図はｌＯ点平均粗さＲ２と１コート、２コート後のＤ０
＋（ａとの関係を示す．
第５図から明らかなように、２コート塗装では、ｌ≦１
２μｍの範囲では、Ｄｏｔ＞７５と良好な鮮映性が得ら
れ、標高差２が小さくなる程Ｄｏｔ値は向上ずる， １
２−≦ｌ≦１６ｐｍの範囲でＤｏｔ値は大きく劣化し、
標高差ｌの増加に対する００１値の劣化量は本実験範囲
で最も大きい．これは標高差ｌ＝１２ｎで塗装後のダル
目残りが生じ出し、ｆｆｉ沼１６一までダル目残りの度
合が急速に悪化するためと考えられる．２≧１６７／Ｉ
１の範囲では、ダル目残りの度合がほぼ飽和するためか
、標高差ｌの増加に対する００１値の低下量は、ｌ２−
≦ｌ≦１６ｐｍの範囲に比べ緩和される．
１コート塗装テスト結果のｌのＤＯ１１ａの関係につい
ては、Ｄｏｔ｛ａの絶対値は２コー１１装結果に比べ約
３０ポイント低下するものの、その傾向については同様
の１ψ向をとる。しかし１コー１装は、２コート塗装よ
りも塗装膜厚が薄いため、塗装後のダル目残りが発生し
出し、Ｄｏｔの低下が著しくなる標高差ｌの値は約８μ
ｍと２コー１装の場合よりも小さくなっている．
第６図の１０点平均粗さＲ２とＤＯＩ（Ｉｉ！の関係に
ついては、第５図の標高差ｌとＤｏｔ値の関係と同等の
関係が得られており、以上の結果より、標高差Ｎ，１０
点平均粗さＲ２とも１０μｓ以下に規制することにより
、塗装股厚の薄いｌコート及び２コート塗装においても
良好な塗装後鮮映値が安定して得られることがわかる．
〈発明の効果〉
以上説明したように、本発明の塗装用ｗ４仮により、プ
レス戒形性を損なうことなく、塗装膜厚の薄いｌコート
及び２コート塗装の用途において、鮮映値を従来よりも
向上させ１｝る頴著な効果が得られる。Based on the above concept, it is necessary to add the following regulations regarding the dimensions of each part that represents the microscopic form. S/D is '; When m/D>1, adjacent valleys are separated, and when Ss/D<1, adjacent valleys are adjacent to each other.Ss When /D is less than 0.5, the mountain m
As a result, 1 almost disappears due to the adjacent valley 4,
Sm/D should be set to 0.5 or more, since the ratio of B4 portion is greatly reduced and a good snoring image value cannot be obtained. Also,
When 3s/D exceeds 2.0, the ratio of valleys 4 decreases,
Sm/D is 2.0 because burn-in is more likely to occur in the hall.
The following shall apply. In addition to Sm/D, the distance between adjacent valleys 4, Sm -D, is a dimensional factor that is related to the likelihood of seizure occurrence.
, and the average diameter d0 of the flat top surface 1 of the mountain portion 3 themselves have a large influence. Ss-D is Sm. , 300JI1 regardless of the size of D
If it is larger than 1, the area of the intermediate flat part 2 generated between adjacent valley parts 4 becomes very large, making it easy to cause burn-in, so it is set to 300 or less. Similarly, the average diameter d0 of the flat top surface l of the ridge portion 3 is set to 500n or less, since seizure is likely to occur if it exceeds 500n. Furthermore, regarding the ratio η of the flat-to-plane surface obtained as a result of the above to the total area, if η is less than 20%, it will not be possible to obtain a good sharp image value, so it should be set to 20% or more, and conversely, η should be 85%.
If it exceeds 85%, seizure is likely to occur, so set it to 85% or less. In the case of thin 1-coat and 2-coat coatings,
In order to prevent dull marks from remaining after painting, it is necessary to reduce the elevation difference l between the top surface of the mountain and the bottom of the valley. Therefore, the present inventors created test specimens with various elevation differences l, coated them with a film thickness of about 307 Ill, visually inspected the remaining dull spots after coating, and investigated the seizure n. As a result of a press test of the same specimen for the purpose of
If the elevation difference l is 10 pIm or less, no marks will be visible visually after coating even with a coating thickness of approximately 304 cm, and if the elevation difference l is greater than or equal to ltl-, then normal It has been found that no seizure occurs under the condition that Breath i Nameyuzu is attached. Therefore, the altitude difference l is 1 to 1
It should be within the range of 0 μm. Table 1 shows some results of the experiment. As aforementioned,
In the present invention, it is important to control the microscopic morphology that forms the phase surface of the steel sheet, but it is also necessary to control not only the microscopic morphology but also the macroscopic roughness of the temporary surface. That is, even if the microscopic morphology is regulated as described above, if the centerline average roughness Ra exceeds 2.0-, the sharpness of the coating will not be sufficiently good; If it is less than fi, seizure is likely to occur during press working. Therefore, Ra is 0.
It should be within the range of 3 to 2.0 pm. In addition, the lO point average roughness nz is set to 10n or less, since if it exceeds lOn, dull marks are likely to remain after painting. Note that the 10-point average roughness R2 is a value that is automatically determined if the center line average roughness Ra and the elevation difference i are regulated as described above. Example: As the material fl4FN, a cold-rolled steel plate with a thickness of 0.8 ns produced by a continuous annealing method equivalent to SI'CE was used. Further, as a work roll for UF4 quality rolling, a dull roll subjected to dull processing using a high-density energy source was used, and jail quality rolling was performed under conditions where the skin pass rolling elongation rate λ was 0.5 to 1.5%. In temper rolling, 1 part of the steel plate surface after iliff rolling is
0 point average roughness R2 and elevation difference l between the top surface of the mountain and the bottom of the valley
The dulling conditions for the roll were also changed in order to make various changes. The roughness of the steel surface after A+IR rolling as described above is D: 20.
On, Ss z 300u, d. Evening l50-, Ss/D
1.5, S--D 100, 3.2pm≦l≦20
．． 5n, 2. hll≦Rz S19.2. Next, chemical conversion treatment was performed on each hollow after III\t rolling under the following conditions. Treatment agent: Fine-grained phosphate-based chemical dip treatment for dip treatment {↑: 40°C x 120 seconds Film ffi: 2.3±0.2 g/cj Pre-treatment:
Treatment after degreasing, washing with water, and surface conditioning: After washing with water, washing with pure water, drying and chemical conversion treatment, 1 coat and 2 coats were applied under the following conditions. Painting position: Horizontal under painting Coating: Cationic ED paint 18-20μ thick top
Coating: Top coat 30-35 Pa thick. Note that the undercoat was omitted for the 1 coat. Regarding the surface of the paint film after painting,
DOl'? The Dot value was measured using an ICON meter. The results are shown in Figures 5 and 6. Figure 5 shows the relationship between the altitude difference l and the Dot value after 1 coat and 2 coats.
The figure shows the average roughness R2 at lO point and D0 after 1 coat and 2 coats.
+ (shows the relationship with a. As is clear from Figure 5, in two-coat painting, l≦1
In the range of 2 μm, good image clarity is obtained with Dot>75, and the Dot value improves as the altitude difference 2 becomes smaller. 1
The Dot value deteriorates significantly in the range of 2-≦l≦16pm,
The amount of deterioration of the 001 value with respect to the increase in elevation difference l is the largest in this experimental range. This is thought to be due to the fact that at the elevation difference l=12n, residual dull spots appear after painting, and the degree of residual dull spots rapidly worsens up to ffi swamp 161. 2≧167/I
In the range of 1, the amount of decrease in the 001 value with respect to the increase in elevation difference 1 is 12-
It is relaxed compared to the range of ≦l≦16pm. Regarding the relationship between 1 and DO11a in the 1-coat painting test results, the absolute value of Dot{a is approximately 30 points lower than the 2-coat and 11-coat results, but the trend follows the same 1ψ direction. However, since the coating film thickness of 1-coat 1-coat is thinner than that of 2-coat coating, dull spots will be left after coating, and the value of the altitude difference l at which the Dot decreases significantly is about 8μ.
It is smaller than the case of one set of m and 2 cords. The relationship between the 10-point average roughness R2 and DOI (Ii! in Figure 6) is the same as the relationship between the elevation difference l and the Dot value in Figure 5, and from the above results, the elevation difference N ,10
It can be seen that by regulating both the point average roughness R2 to 10 μs or less, good post-painting sharpness values can be stably obtained even in thin 1-coat and 2-coat coatings. <Effects of the Invention> As explained above, the W4 temporary coating of the present invention improves the sharpness value compared to the conventional method in applications for l-coat and 2-coat coatings with thin coating film thickness, without impairing press formability. A remarkable effect can be obtained by improving the
４．図面のＩ”ｉｉＴ小な説明
第１図は本発明にかかわる鋼板の粗面の微視的プロフィ
ールを模式的に示す断面図、第２図は第１図に対応ずる
平面図、第３図は第２図の微視的形態の各寸法の定義を
示す図、第４図は第１図の微視的形態の各寸法の定義を
示す図、第５図はｌコート及び２コート塗装を施した場
合の鋼｛反の微視的プロフィールにおける山部の山頂面
と谷部の底の標高差１．１！：’ｉｎ’ｊＪのＤ○］値
の関係を示す相関図、第６図は１コート及び２コート塗
装を施した場合のｔＩｉｉＩ坂粗面の１０点平均粗さＲ
２と塗膜のＤｏｉ値の関係を示す相関図である。4. Brief description of the drawings Fig. 1 is a sectional view schematically showing the microscopic profile of the rough surface of a steel plate related to the present invention, Fig. 2 is a plan view corresponding to Fig. 1, and Fig. Figure 4 is a diagram showing the definition of each dimension of the microscopic form in Figure 1, Figure 5 is a diagram showing the definition of each dimension of the microscopic form in Figure 1, and Figure 5 is a diagram showing the definition of each dimension of the microscopic form in Figure 1. Figure 6 is a correlation diagram showing the relationship between the steel {elevation difference between the top surface of the mountain and the bottom of the valley in the microscopic profile of 1.1!: D○ of 'in'jJ] when 10-point average roughness R of tIII slope rough surface when 1-coat and 2-coat painting is applied
2 is a correlation diagram showing the relationship between Doi value of the paint film and Doi value of the paint film.
ｌ・・・ｗ４仮表面の山部の平坦な山Ｉｒｔ面、２・・
・鋼板表面の中間平坦部、
３・・・ｗ４仮表面の山部、
４・・・ｗＪ坂表面の谷部。l...w4 Flat peaks on the peaks of the temporary surface Irt surface, 2...
・Intermediate flat part of the steel plate surface, 3...Mountain part of w4 temporary surface, 4...Trough part of wJ slope surface.
特許出廟人 川崎製鉄株式会社 第 １ 図 第 ３ 図 η＝ηｌ＋η２ 第 乙 図Patent author Kawasaki Steel Co., Ltd. No. 1 figure No. 3 figure η=ηl+η2 No. Otsu figure
Claims (1)
Ｒａが０．３〜２．０μｍの範囲内にあり、かつその表
面粗さを構成する微視的形態が、平坦な山頂面を有する
台形状の山部と、その周囲の全部または一部を取囲むよ
うに形成された溝状の谷部と、山部の間であってかつ谷
部の外側にその谷部より高くかつ山部の山頂面より低い
かまたは同じ高さに形成された中間平坦部によって構成
され、しかも隣合う山部の平均中心間距離をＳｍ、谷部
の外縁の平均直径をＤ、山部の平坦な山頂面の平均直径
をｄ＿０、山部の山頂面と谷部の底との標高差をｌ、山
部の平坦な山頂面と前記中間平坦部の平坦面の面積の和
が全面積に占める割合をη（％）と定義したとき、 ０．５≦Ｓｍ／Ｄ≦２．０ Ｓｍ−Ｄ≦３００μｍ ｄ＿０≦５００μｍ １μｍ≦ｌ≦１０μｍ ２０％≦η≦８５％ を満足するように構成されていることを特徴とする塗装
用鋼板。[Scope of Claims] The center line average roughness Ra of at least one surface of the front and back surfaces of the steel plate is within the range of 0.3 to 2.0 μm, and the microscopic morphology constituting the surface roughness is flat. A trapezoidal ridge with a trapezoidal top surface, a groove-shaped trough formed to surround all or part of the periphery, and a trough between the ridges and outside of the trough. It is composed of intermediate flat parts that are higher and lower than or at the same height as the top surface of the mountain part, and the average distance between the centers of adjacent mountain parts is Sm, the average diameter of the outer edge of the valley part is D, and the mountain part is d_0 is the average diameter of the flat top of the mountain, l is the elevation difference between the top of the mountain and the bottom of the valley, and the sum of the areas of the flat top of the mountain and the flat surface of the intermediate flat part is the total. When the ratio to the area is defined as η (%), the following should be satisfied: 0.5≦Sm/D≦2.0 Sm-D≦300μm d_0≦500μm 1μm≦l≦10μm 20%≦η≦85% A steel plate for painting characterized by the following:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1299842A JPH03161103A (en) | 1989-11-20 | 1989-11-20 | Steel sheet for coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1299842A JPH03161103A (en) | 1989-11-20 | 1989-11-20 | Steel sheet for coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03161103A true JPH03161103A (en) | 1991-07-11 |
Family
ID=17877587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1299842A Pending JPH03161103A (en) | 1989-11-20 | 1989-11-20 | Steel sheet for coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03161103A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993004796A1 (en) * | 1991-09-03 | 1993-03-18 | Nippon Steel Corporation | Method of manufacturing steel plates having high definition of paint and high press formability and dull rolling rolls |
| FR2709689A1 (en) * | 1993-09-09 | 1995-03-17 | Lorraine Laminage | Process for the surface forming of a metal sheet, rolling-mill rolls for implementing the process, and sheet obtained |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62168602A (en) * | 1986-01-17 | 1987-07-24 | Kawasaki Steel Corp | Steel sheet for painting and its production |
| JPS63132701A (en) * | 1986-11-25 | 1988-06-04 | Kawasaki Steel Corp | Steel sheet for painting and its production |
-
1989
- 1989-11-20 JP JP1299842A patent/JPH03161103A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62168602A (en) * | 1986-01-17 | 1987-07-24 | Kawasaki Steel Corp | Steel sheet for painting and its production |
| JPS63132701A (en) * | 1986-11-25 | 1988-06-04 | Kawasaki Steel Corp | Steel sheet for painting and its production |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993004796A1 (en) * | 1991-09-03 | 1993-03-18 | Nippon Steel Corporation | Method of manufacturing steel plates having high definition of paint and high press formability and dull rolling rolls |
| US5358794A (en) * | 1991-09-03 | 1994-10-25 | Nippon Steel Corporation | Steel strip and method for producing rolling dull roll |
| FR2709689A1 (en) * | 1993-09-09 | 1995-03-17 | Lorraine Laminage | Process for the surface forming of a metal sheet, rolling-mill rolls for implementing the process, and sheet obtained |
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