JPS62230954A - Cold-rolled steel sheet - Google Patents
Cold-rolled steel sheetInfo
- Publication number
- JPS62230954A JPS62230954A JP7362486A JP7362486A JPS62230954A JP S62230954 A JPS62230954 A JP S62230954A JP 7362486 A JP7362486 A JP 7362486A JP 7362486 A JP7362486 A JP 7362486A JP S62230954 A JPS62230954 A JP S62230954A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- cold
- rolled steel
- roughness
- galling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000010960 cold rolled steel Substances 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 19
- 239000010959 steel Substances 0.000 claims abstract description 19
- 230000003746 surface roughness Effects 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 abstract 2
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 238000010422 painting Methods 0.000 description 23
- 238000000576 coating method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 239000003973 paint Substances 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000005406 washing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- OKISBDHRUPZLOC-UHFFFAOYSA-N gallin Chemical compound OC(=O)C1=CC=CC=C1C1C2=CC=C(O)C(O)=C2OC2=C(O)C(O)=CC=C21 OKISBDHRUPZLOC-UHFFFAOYSA-N 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005259 measurement Methods 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
- 238000002310 reflectometry Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Metal Rolling (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は自動車ボディ外板や家庭電気製品の外装板の
如く、プレス加工等の成形加工および塗装を施して使用
される冷延鋼板に関し、特にその表面構造に関するもの
である。Detailed Description of the Invention Field of Industrial Application This invention relates to cold-rolled steel sheets that are used after being subjected to forming processes such as press working and painting, such as the outer panels of automobile bodies and the outer panels of household electrical appliances. It concerns surface structure.
従来の技術
乗用車はもちろん、軽自動車、ワゴン車、ざらにはトラ
ックに至るまで、塗装後のボディの塗装仕上り品質の良
さは自動車の総合的な品質の高さを顧客に対し直接的に
視覚によって訴えることができるため、自動車メーカー
においては、塗装仕上り品質の向上が強く求められるよ
うになっている。塗装仕上り品質の表面項目としては、
光の反射性の良さを定義する“光沢性ヤ、塗装面に写し
出される写像の歪みの少なさを定義する°“写像性″、
ざらには塗装面での光の反射のされ方によって視覚的に
把握されるペイント層の貿量感を定義する“肉もち感゛
、゛豊麗窓′°、゛深み感”′などがあるが、これのう
ち特に光沢性と写像性が重要であり、これらの光沢性と
写像性を必わせて一般に゛鮮映性″と称している。Conventional technology The quality of the paint finish on the painted body of not only passenger cars but also light cars, wagons, and even trucks is a direct visual indicator of the overall high quality of the car to the customer. Therefore, there is a strong demand among automobile manufacturers to improve the quality of the paint finish. Surface items for paint finish quality include:
“Glossiness” defines the good reflectivity of light, and “Image clarity” defines the low distortion of the image projected on the painted surface.
Roughness includes ``feeling of fleshiness,'' ``feeling of richness,'' and ``feeling of depth,'' which define the sense of volume of a paint layer that can be visually grasped by the way light is reflected on the painted surface. Among these, gloss and image clarity are particularly important, and these gloss and image clarity are generally referred to as "image clarity."
鮮映性の評価の方法としては種々の方式が開発されてる
が、最も一般的には、米国のハンター・アソシエイツ・
ラボラトリ−(Hunter As5ociates
Laboratory)社製のドリブン(DORI
GON )メータによる測定値すなわちDo I (D
istinctnessof Image)値が使用
されている。このDOI値は、第10図に示すように、
試料Sに対し入射角30’で光を入射し、その正反射光
強度R5と正反射角に対し±0.3°での散乱光強度R
6,3の値を用いて、次式で表わされる。Various methods have been developed to evaluate sharpness, but the most commonly used method is the one developed by Hunter Associates in the United States.
Laboratory (Hunter As5ociates)
Driven (DORI) manufactured by Laboratory)
Do I (D
istinctnessof Image) value is used. This DOI value is, as shown in Figure 10,
Light is incident on the sample S at an incident angle of 30', and its specular reflection light intensity R5 and scattered light intensity R at ±0.3° with respect to the specular reflection angle are
Using the values of 6 and 3, it is expressed by the following equation.
DOI値= 100X (Rs−RO,3) /R3こ
のようなりOI値は、肉眼で視認される鮮映性評価指数
(例えばLandort C丁estによる指数)と良
好な相関を持つことが知られており、したがってDOI
値が高いほど塗装面の鮮映性が優れていると言うことが
でき、一般に自動車車体の外板の塗膜については、充分
な高級感を呈するためには3コート塗装でDOI値が9
0%以上、望ましくは94%以上であることが要求され
ている。なお安価な2コーi〜塗装の場合でもDOII
直85直上5以上しいとされている。DOI value = 100X (Rs-RO, 3) /R3 It is known that the OI value has a good correlation with the image sharpness evaluation index (for example, the index by Landort CT-est) that can be seen with the naked eye. Therefore, the DOI
It can be said that the higher the value, the better the sharpness of the painted surface.Generally speaking, for paint films on the exterior of automobile bodies, a DOI value of 9 is required with 3 coats in order to provide a sufficiently luxurious look.
It is required that it be 0% or more, preferably 94% or more. In addition, even in the case of inexpensive 2-coat painting, DOII
It is said that it is more than 85 straight above 5.
上述の鮮映性は、塗装の方法や塗料の特性によって大き
な影響を受けることは勿論でおるが、そればかりてなく
、塗装下地である鋼板の表面の粗度の影響を受けること
が知られている。従来このような鋼板表面の粗度と塗装
表面の鮮映性との関係については、USスチールのT、
G、 Milan等による報告(1980年2月、7
5th SAE Congress )が必る。この報
告によれば、塗装後の鮮映性は、鋼板表面の中心線平均
粗さくRa)と、1インチ当りの粗度を形成する山の数
(PP I :Peak perInch )によって
影響を受けるとされている。It goes without saying that the sharpness mentioned above is greatly affected by the coating method and the characteristics of the paint, but it is also known that it is affected by the roughness of the surface of the steel plate that is the base for painting. There is. Conventionally, regarding the relationship between the roughness of the steel plate surface and the sharpness of the painted surface, US Steel's T,
Report by G. Milan et al. (February 1980, 7
5th SAE Congress) is necessary. According to this report, the sharpness of the image after painting is affected by the centerline average roughness (Ra) of the steel plate surface and the number of peaks forming roughness per inch (PPI: Peak perInch). has been done.
発明が解決すべき問題点
本発明者等は、鋼板表面の粗度と塗装表面の鮮映性との
関係を明確化するため、鋼板の表面粗度についての種々
の因子と、塗装前の化成処理条件、塗料の種類、塗装方
法を種々変化させて大量の塗装実験を行なったところ、
次のような結論が得られた。Problems to be Solved by the Invention In order to clarify the relationship between the roughness of the steel sheet surface and the sharpness of the painted surface, the present inventors investigated various factors regarding the surface roughness of the steel sheet and chemical formation before painting. After conducting a large number of coating experiments with various processing conditions, types of paint, and coating methods, we found that
The following conclusions were reached.
(i)鮮映性には例えば第1図に示すように塗膜厚の影
響を強く受け、塗膜厚が厚いほど鮮映性が良好なこと。(i) The image clarity is strongly influenced by the coating thickness, as shown in FIG. 1, for example, and the thicker the coating, the better the image clarity.
(ii)鋼板表面の中心線平均粗さくRa)と鮮映性を
表わすDOI値との間には、例えば第2図(2コート塗
装、塗膜厚35戸の場合)、第3図(3コート塗装の場
合)に示すように強い相関関係があり、Raが小ざいほ
ど鮮映性が良好となり、特に3コート塗装でDOI値9
0以上、2コー1〜塗装でDOI値85以上を得るため
には、Raが1.1um以下でおることが必要でおる。(ii) There is a difference between the center line average roughness (Ra) of the steel plate surface and the DOI value representing image clarity, for example, as shown in Figure 2 (2 coats, coating thickness 35 units) and Figure 3 (35 coats). There is a strong correlation as shown in (in the case of coat painting), and the smaller the Ra, the better the image sharpness.
In order to obtain a DOI value of 85 or more with coatings of 0 or more and 2 coats of 1 to 1, it is necessary that Ra is 1.1 um or less.
(iii)鋼板表面の1インチおたりの山の数(PPI
)は、例えば第4図、第5図に示すように鮮映性とは特
に相関関係が認められないこと。(iii) Number of peaks per inch (PPI) on the steel plate surface
) has no particular correlation with image sharpness, as shown in FIGS. 4 and 5, for example.
以上のように、本発明者等の研究によって最近の自動車
ボディの塗装表面の鮮映性の要求(3コート塗装でDO
I値90以上、2コート塗装でDOll[85以上)を
満たすためにはRaを1.1νm以下とすることが必要
でおるが、PPIは特に規制する必要がないことが判明
した。As mentioned above, the research conducted by the present inventors has revealed that the recent requirements for sharpness of painted surfaces of automobile bodies (DO
In order to satisfy the I value of 90 or more and the DOll [85 or more] with two coats, it is necessary to keep Ra to 1.1 νm or less, but it has been found that there is no need to specifically regulate PPI.
ところで、一般に自動車ボディは冷延鋼板をプレス加工
して製造するのが通常でおるが、プレス加工の工程では
鋼板とプレス金型とが焼付きを起す現象、すなわち所謂
ゴーング(Gallin(1)が発生することがある。Incidentally, automobile bodies are generally manufactured by pressing cold-rolled steel sheets, but during the press-forming process, the steel sheet and the press die may seize, which is the so-called gong (Gallin (1)). This may occur.
このゴーリングが発生すれば、金型を損傷したり、プレ
ス後の製品の商品価値を著しく低下させる等の不利益を
もたらす。If this galling occurs, it will cause disadvantages such as damaging the mold and significantly reducing the commercial value of the product after pressing.
一般にプレス加工においては鋼板表面の粗度が小さいほ
ど、プレス潤滑油が不足気味となって焼付きが発生し易
いことすなわちゴーリングが生じ易いことが知られてい
る。したがって前述のように塗装面の鮮映性を向−ヒさ
せるために粗度を著しく小ざくすれば、プレス加工時に
おいてゴーリングが発生し易くなってしまうという問題
がある。Generally, in press working, it is known that the smaller the surface roughness of a steel plate, the more likely the press lubricating oil will be insufficient and seizure will occur, that is, galling will occur. Therefore, as mentioned above, if the roughness of the coated surface is significantly reduced in order to improve its sharpness, there is a problem in that galling is more likely to occur during press working.
すなわち塗装面の鮮映性の向上とプレス加工時における
耐ゴーリング性の向上とは両立させることが従来は困難
とされていたのでおる。In other words, it has conventionally been difficult to achieve both improvements in the sharpness of the painted surface and improvements in galling resistance during press working.
この発明は以上の事情を背景としてなされたもので、プ
レス加工時にあける耐ゴーリング性が良好であってしか
も表面粗度が小さく塗装面の鮮映性を良好となし得る冷
延鋼板を提供することを目的とするものである。The present invention was made against the background of the above-mentioned circumstances, and an object of the present invention is to provide a cold-rolled steel sheet that has good galling resistance during press working, has a small surface roughness, and can provide good clarity on the painted surface. The purpose is to
問題点を解決するための手段
本発明者等は上述の目的を達成するべく、表面粗度に関
する種々の因子と耐ゴーリング性との関係について種々
実験・検討を重ねた結果、中心線平均粗ざRaが1.I
JJm以下という条件下、すなわち鮮映性をあられすD
OI値が3コートの場合90以上、コートの場合85以
上となるような微小粗さの条件下でも、粗さの中心線に
おいて測定した粗度を形成するピークの平均直径Lmp
と中心線平均粗さRaとの積(LmpXRaが90JJ
Irt以上、望ましくは100IIIIL以上であれば
、耐ゴーリング性が優れることを見出し、この発明をな
すに至ったのでおる。Means for Solving the Problems In order to achieve the above-mentioned object, the inventors of the present invention have conducted various experiments and studies on the relationship between various factors related to surface roughness and galling resistance. Ra is 1. I
Under the condition of JJm or less, that is, the image clarity is poor.
Even under microroughness conditions where the OI value is 90 or more for 3 coats and 85 or more for coats, the average diameter Lmp of the peak forming the roughness measured at the center line of the roughness
and the center line average roughness Ra (LmpXRa is 90JJ
It has been found that galling resistance is excellent when it is at least Irt, preferably at least 100IIIL, and this invention has been completed.
すなわちこの発明の冷延鋼板は、鋼板の少なくとも片面
の中心線平均表面粗ざRaがi、1pm以下でおり、し
かもその面の粗さの中心線において測定した粗度を形成
するピークの平均直径Lmp(JJm)と中心線平均粗
ざRa(νm)との積が90層以上でおることを特徴と
するものである。That is, the cold-rolled steel sheet of the present invention has a centerline average surface roughness Ra of at least one side of the steel sheet i, 1 pm or less, and an average diameter of the peak forming the roughness measured at the centerline of the roughness of that surface. It is characterized in that the product of Lmp (JJm) and center line average roughness Ra (νm) is 90 or more layers.
作 用 先ずこの発明をなすに至った知見について説明する。For production First, the knowledge that led to this invention will be explained.
本発明者等は、板厚0.5#〜2.Omの種々の表面粗
度因子を有する冷延鋼板を用いて実際にプレス加工試験
を行なって、焼付きの発生と表面粗度因子との関係につ
いて整理した結果、第6図および下記(1)式で定義さ
れる中心線平均粗さRaと第7図および下記(2)式で
定義される平均ピーク直径Lmt)との積(RaXLm
p)の値が90JJtti未満ではゴーリングが発生し
易いのに対し90IJ/1i以上ではゴーリングが発生
しにくくなること、すなわち下記(3)式の条件を満た
すことによりゴーリングの発生を最小限に抑えることが
できることを見出した。The present inventors have determined that the plate thickness is 0.5# to 2. We actually conducted press working tests using cold-rolled steel sheets with various surface roughness factors of Om, and summarized the relationship between the occurrence of seizure and surface roughness factors, as shown in Figure 6 and (1) below. The product (RaXLm) of the center line average roughness Ra defined by the formula and the average peak diameter Lmt defined in FIG. 7 and the following formula (2)
If the value of p) is less than 90JJtti, galling is likely to occur, whereas if it is 90IJ/1i or more, galling is less likely to occur, that is, by satisfying the condition of formula (3) below, galling can be minimized. I discovered that it can be done.
RaxLmI]≧90 (m) ・(3)
ここで、Lは測定長さ、Yは表面粗さの撮幅、nは粗度
の中心線におけるピークの直径、nは粗度の中心線にお
けるピークの数を表わす。RaxLmI]≧90 (m) ・(3)
Here, L is the measurement length, Y is the imaging width of the surface roughness, n is the diameter of the peak at the center line of the roughness, and n is the number of peaks at the center line of the roughness.
第8図から明らかなように中心線平均粗ざRaが1.1
νm以下でも(3)式を満たす領域は存在し、したがっ
てRaが1.IJ、1m以下、Raxlmpが901J
IA以下となるような表面構造とすることにより、塗装
後の塗装面の鮮映性を良好とすると同時にプレス加工時
のゴーリングの発生を防止することができるのである。As is clear from Figure 8, the center line average roughness Ra is 1.1.
There is a region that satisfies equation (3) even below νm, so Ra is 1. IJ, 1m or less, Raxlmp is 901J
By creating a surface structure with an IA or less, it is possible to improve the sharpness of the painted surface after painting and at the same time prevent the occurrence of galling during press working.
なおここでRaxl−mpの値が90層以上で耐ゴーリ
ング性の向上に有効であるが、より充分に耐ゴーリング
性を向上させるためには、Raxlmpの値が1001
J/A以上であることが望ましい。Note that it is effective to improve the galling resistance when the Raxl-mp value is 90 layers or more, but in order to improve the galling resistance more fully, the Raxlmp value should be 1001 layers or more.
It is desirable that it is J/A or higher.
Raが1.IJ、1m以下でしかもRaxlmpの値が
90層以上の粗度を有する表面構造の冷延鋼板を製造す
る方法は任意であるが、例えば冷延鋼板製造工程におけ
る最終調質圧延(スキンパス圧延)において、ワークロ
ールの表面構造を調整しておくことにより達成できる。Ra is 1. The method for producing a cold-rolled steel sheet with a surface structure having a roughness of IJ, 1 m or less and a Raxlmp value of 90 layers or more is arbitrary, but for example, in the final temper rolling (skin pass rolling) in the cold-rolled steel sheet production process. This can be achieved by adjusting the surface structure of the work roll.
すなわち調質圧延においては、ワークロールの表面構造
が冷延鋼板表面に転写されるから、例えばレーザ加工お
るいは放電加工等によりワークロール表面に所要の粗度
プロフィル、すなわち調質圧延された冷延鋼板の表面粗
度条件が前記条件を満足し得るような粗度プロフィルを
形成しておけば良い。In other words, in temper rolling, the surface structure of the work roll is transferred to the surface of the cold-rolled steel sheet, so for example, laser machining or electric discharge machining can be used to create the required roughness profile on the work roll surface, that is, the cold rolled steel sheet. It is sufficient to form a roughness profile such that the surface roughness conditions of the rolled steel plate can satisfy the above conditions.
なお前記のような粗度条件を有する面は、冷延鋼板少な
くとも片面であれば良い。すなわち、一般の自動車ボデ
ィ外板においては、塗装面の鮮映性が要求されるのは車
体外側の片面だけでおり、したがって車体内側の面は表
面粗さを相当に大きくしておいても良く、この場合車体
内側の面は特にLmpXRaの値を規制しなくても耐ゴ
ーリング性は良好となるからである。Note that at least one surface of the cold-rolled steel sheet may have the roughness condition as described above. In other words, in the case of general car body exterior panels, only one side, the outside of the car body, is required to have high visibility of the painted surface, so the surface roughness on the inside side of the car body can be kept considerably high. In this case, the galling resistance of the inner surface of the vehicle body can be improved even if the value of LmpXRa is not particularly restricted.
実施例
C0,04%、MnO,2%、P O,02%、30.
015%、N O,003%、Q O,005%を含有
し、残部がその他の不可避的不純物およびFeよりなる
組成の0.7〜0.8#厚の種々の表面粗度を有する多
数の冷延鋼板について、プレス加工試験を行ない、ゴー
リングの発生の有無について調査した。Example C0.04%, MnO, 2%, PO, 02%, 30.
0.015%, NO, 0.03%, QO. A press working test was conducted on cold rolled steel sheets to investigate the occurrence of galling.
また各冷延鋼板について、次のような条件で化成処理お
よび3コート塗装を施した。Further, each cold-rolled steel sheet was subjected to chemical conversion treatment and three-coat painting under the following conditions.
[化成処理条件]
処理剤:ディップ処理用細粒型リン酸塩系薬剤
ディップ条件:43°CX 120秒
皮Il1重耐:2.3±0.2Cj/crtt前処理:
税脂、水洗、表面調整
後処理 :水洗、純水洗、乾燥
[3コ一ト塗装条件]
塗装姿勢:水平塗装
下塗り:カチオンED塗料 18〜20JJm厚中塗り
:シーラー 30〜sob、1m厚上塗りニドツブコー
ト 30〜35J、1m厚なお各工程ともにサンディン
グは行なわなかった。[Chemical conversion treatment conditions] Treatment agent: fine-grained phosphate-based drug for dip treatment Dip conditions: 43°CX 120 seconds Skin Il1 heavy resistance: 2.3±0.2Cj/crtt Pretreatment:
Washing, washing with water, surface conditioning Post-treatment: Washing with water, washing with pure water, drying [3-coat painting conditions] Painting position: Horizontal painting Undercoat: Cationic ED paint 18-20JJm thick intermediate coat: Sealer 30-sob, 1m thick top coat Nidotsubu coat 30 to 35 J, 1 m thick. Sanding was not performed in each step.
塗装後の塗膜表面について、DOIRGONメータによ
りDOI値の測定を行なった。The DOI value of the coated film surface after painting was measured using a DOIRGON meter.
上述のようにしてプレス加工時のゴーリングの発生の有
無と鮮映性(DOI値)を調べた結果を、RaXLmp
の値に対応して第9図に示す。なお第9図中における各
記号01■、e、、、口、2のRa、Lmpは第1表に
示す通りでおる。また各記号で白地のものく中線入りを
含む)はゴーリングの発生がなかった場合を、また黒く
塗りつぶした部分がおるものはゴーリングが発生した場
合を示す。RaXLmp
The values are shown in FIG. The Ra and Lmp of each symbol 01, e, , 2 in FIG. 9 are as shown in Table 1. In addition, each symbol (including a white background with a center line) indicates a case where no galling occurred, and a symbol with a black area indicates a case where galling occurred.
第 1 表
第9図から明らかなように、RaXLmpが90層未満
の冷延鋼板ではゴーリングが発生していたのに対し、R
a X L mpが90層以上ではゴーリングの発生が
少なくなり、特に100廚以上ではほぼ完全にゴーリン
グの発生を防止することができた。また鮮映性を表わす
DOII直は、Raが1.1戸以下の場合に確実に90
以上を得ることができた。したがってRaを1.IJJ
m以下としかつRaXLmpを90席1以上、望ましく
は100遍以上とすることによって、塗装後の塗装面に
おいて優れた鮮映性を得ると同時に、にれた耐ゴーリン
グ性を得られることが明らかである。As is clear from Table 1, Figure 9, galling occurred in cold-rolled steel sheets with RaXLmp of less than 90 layers;
When the aX L mp was 90 or more layers, the occurrence of galling was reduced, and in particular, when the axlmp was 90 or more layers, galling was almost completely prevented from occurring. In addition, DOII directness, which indicates image clarity, is definitely 90 when Ra is 1.1 or less.
I was able to get more than that. Therefore, Ra is 1. IJJ
It is clear that by setting RaXLmp to 90 seats or more, preferably 100 times or more, it is possible to obtain excellent image clarity on the painted surface after painting and at the same time to obtain excellent galling resistance. be.
発明の効果
以上の説明で明らかなようにこの発明の冷延鋼板は、塗
装後において優れた鮮映性を得ることができると同時に
、プレス加工時においてゴーリングが発生することをも
有効に防止でき、したがって自動車ボディ外板などに適
用して塗装面に優れた高級感を与えることができるとと
もに、プレス加工におけるゴーリングの発生によりプレ
ス金型の損傷を招いたり表面外観性状を損なったりする
おそれがない。Effects of the Invention As is clear from the above explanation, the cold-rolled steel sheet of the present invention can obtain excellent image clarity after painting, and at the same time can effectively prevent galling during press working. Therefore, it can be applied to automobile body outer panels, etc. to give the painted surface an excellent high-class look, and there is no risk of damaging the press mold or impairing the surface appearance due to galling during press processing. .
第1図は塗膜厚と塗装面の鮮映性を必られ丁D01値と
の関係を示す相関図、第2図は2コート塗装の場合の鋼
板表面の中心線平均粗さくRa)と塗装後のDOI値と
の関係を示す相関図、第3図は3コート塗装の場合の鋼
板の表面のRaと塗装後のDOI値との関係を示す相関
図、第4図は2コート塗装の場合の鋼板表面のPPIと
塗装後のDOllliIどの関係を示す図、第5図は3
コート塗装の場合の鋼板表面のPPIと塗装後のD(]
値との関係を示す図、第6図は中心線平均粗さくRa)
の定義を説明するための線図、第7図は中心線平均ピー
ク直径(Lmp)の定義を説明するための線図、第8図
はプレス加工時におけるゴーリングの発生の傾向を、鋼
板表面のRaとLmpに対応して示す線図、第9図は実
施例にあける各冷延鋼板の塗装後のDOI値とプレス加
工時のゴーリングの発生の有無とを、Ra、Xlmpの
値に対応して示す図、第10図はDOIfmの測定方法
を説明するための説明図である。Figure 1 is a correlation diagram showing the relationship between the coating film thickness and the D01 value that determines the sharpness of the painted surface, and Figure 2 is a correlation diagram showing the relationship between the centerline average roughness (Ra) of the steel sheet surface and the coating in the case of two-coat painting. A correlation diagram showing the relationship with the subsequent DOI value. Figure 3 is a correlation diagram showing the relationship between Ra on the surface of the steel plate and the DOI value after painting in the case of 3-coat painting. Figure 4 is a correlation diagram showing the relationship between the DOI value after painting and 2-coat painting. Figure 5 shows the relationship between PPI on the steel plate surface and DOlliI after painting.
PPI of the steel plate surface in the case of coat painting and D after painting (]
Figure 6 shows the relationship between centerline average roughness (Ra)
Figure 7 is a diagram to explain the definition of center line average peak diameter (Lmp), Figure 8 is a diagram to explain the tendency of galling during press working on the steel plate surface. The diagram shown in FIG. 9 corresponds to Ra and Lmp, and FIG. 9 shows the DOI value after painting and the presence or absence of galling during press working of each cold-rolled steel sheet in the example, corresponding to the values of Ra and Xlmp. FIG. 10 is an explanatory diagram for explaining the method of measuring DOIfm.
Claims (1)
1μm以下であり、しかもその面の粗さの中心線におい
て測定した粗度を形成するピークの平均直径Lmp(μ
m)と中心線平均粗さRa(μm)との積が90μm^
2以上であることを特徴とする冷延鋼板。The centerline average surface roughness Ra of at least one side of the steel plate is 1.
The average diameter Lmp (μ
m) and the center line average roughness Ra (μm) is 90 μm^
A cold-rolled steel sheet characterized in that it is 2 or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61073624A JPH07109022B2 (en) | 1986-03-31 | 1986-03-31 | Cold rolled metal sheet with excellent galling resistance and sharpness after painting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP61073624A JPH07109022B2 (en) | 1986-03-31 | 1986-03-31 | Cold rolled metal sheet with excellent galling resistance and sharpness after painting |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS62230954A true JPS62230954A (en) | 1987-10-09 |
JPH07109022B2 JPH07109022B2 (en) | 1995-11-22 |
Family
ID=13523654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP61073624A Expired - Lifetime JPH07109022B2 (en) | 1986-03-31 | 1986-03-31 | Cold rolled metal sheet with excellent galling resistance and sharpness after painting |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH07109022B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05222485A (en) * | 1992-02-10 | 1993-08-31 | Kobe Steel Ltd | Hot rolled steel plate excellent in press formability and affinity for resin and its production |
JP2011200795A (en) * | 2010-03-25 | 2011-10-13 | Nisshin Steel Co Ltd | Method for manufacturing coated steel sheet |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5643379A (en) * | 1979-09-14 | 1981-04-22 | Ig Tech Res Inc | Production of blowing agent |
JPS5934441A (en) * | 1982-08-19 | 1984-02-24 | Honda Motor Co Ltd | Control method of air-fuel ratio of internal-combustion engine |
JPS6167794A (en) * | 1984-09-10 | 1986-04-07 | Nippon Steel Corp | Manufacture of steel sheet for coating having superior corrosion resistance and high sharpness |
JPS61242670A (en) * | 1985-04-18 | 1986-10-28 | Sumitomo Metal Ind Ltd | Production of coated steel sheet |
-
1986
- 1986-03-31 JP JP61073624A patent/JPH07109022B2/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5643379A (en) * | 1979-09-14 | 1981-04-22 | Ig Tech Res Inc | Production of blowing agent |
JPS5934441A (en) * | 1982-08-19 | 1984-02-24 | Honda Motor Co Ltd | Control method of air-fuel ratio of internal-combustion engine |
JPS6167794A (en) * | 1984-09-10 | 1986-04-07 | Nippon Steel Corp | Manufacture of steel sheet for coating having superior corrosion resistance and high sharpness |
JPS61242670A (en) * | 1985-04-18 | 1986-10-28 | Sumitomo Metal Ind Ltd | Production of coated steel sheet |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05222485A (en) * | 1992-02-10 | 1993-08-31 | Kobe Steel Ltd | Hot rolled steel plate excellent in press formability and affinity for resin and its production |
JP2011200795A (en) * | 2010-03-25 | 2011-10-13 | Nisshin Steel Co Ltd | Method for manufacturing coated steel sheet |
Also Published As
Publication number | Publication date |
---|---|
JPH07109022B2 (en) | 1995-11-22 |
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