JP2530968B2 - Steel strip with excellent paint clarity and press formability - Google Patents
Steel strip with excellent paint clarity and press formabilityInfo
- Publication number
- JP2530968B2 JP2530968B2 JP4066728A JP6672892A JP2530968B2 JP 2530968 B2 JP2530968 B2 JP 2530968B2 JP 4066728 A JP4066728 A JP 4066728A JP 6672892 A JP6672892 A JP 6672892A JP 2530968 B2 JP2530968 B2 JP 2530968B2
- Authority
- JP
- Japan
- Prior art keywords
- steel strip
- steel
- roll
- steel sheet
- recesses
- 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.)
- Expired - Lifetime
Links
Landscapes
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、鋼板表面粗度パターン
を規制する事により、塗装鮮映性、及びプレス成型性を
向上させる事を目的とし、冷間圧延鋼板、表面処理鋼
板、熱間圧延鋼板、アルミ鋼板、アルミ合金鋼板及びク
ラッド鋼板に適用されるものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention aims to improve coating clarity and press formability by regulating a steel plate surface roughness pattern. It is applied to rolled steel plate, aluminum steel plate, aluminum alloy steel plate and clad steel plate.
【0002】[0002]
【従来の技術】一般に、加工用冷間圧延鋼板は、プレス
加工し易くするため、鋼板表面をダル仕上げする。即
ち、プレス加工時、鋼板表面に形成された凹凸に、加工
用潤滑油が貯留され、金型と鋼板の摩擦を少なくし、か
つ焼付けを防止する作用をするからである。プレス成型
性に関する研究は、素材である鉄板側と、成型技術の両
面から行われてきているが、製品の高精度化と複雑化に
伴い、鋼板に対する要求特性がより高級化、多様化しつ
つある。このため、現状としては、鋼板粗度を最終的に
調整する調質圧延において、鋼板表面にショットブラス
ト、放電、あるいはレーザー等でダル加工したワークロ
ールを使用し、鋼板表面に粗さを転写している。また、
実際のプレス成型における評価基準は、従来用いられて
きた鋼板の機械的特性(r値、El値等)だけでは不十
分であり、鋼板表面粗度潤滑油等もプレス成型性に大き
な影響を及ぼす。2. Description of the Related Art Generally, the surface of a cold-rolled steel sheet for processing is dull-finished in order to facilitate press working. That is, during press working, working lubricating oil is stored in the irregularities formed on the surface of the steel sheet, thereby reducing the friction between the mold and the steel sheet and preventing seizure. Research on press formability has been carried out from both the side of the steel plate, which is the material, and the forming technology, but with the increasing precision and complexity of products, the required properties for steel plates are becoming more sophisticated and diversified. . For this reason, at present, in the temper rolling to finally adjust the roughness of the steel sheet, a work roll that has been subjected to shot blasting, electric discharge, or dulling with a laser, etc. is used to transfer the roughness to the steel sheet surface. ing. Also,
The evaluation criteria in actual press forming are not sufficient only by the mechanical properties (r value, El value, etc.) of the steel sheets that have been used conventionally, and the steel plate surface roughness lubricating oil etc. also has a great influence on the press formability. .
【0003】一方、自動車ボディや家電製品などの外装
鋼板は、塗装仕上げをして、美観を付与するが、この
際、塗装面の乱反射によって美観を損なわれないように
すること即ち、所謂鮮映性に優れていることが要求され
る。上記のような従来技術として、特開昭62−168
602号公報「塗装用鋼板及びその製造方法」がある。
その内容は、表面の中心線平均粗さ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
の底よりも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とによって構成され、しか
も隣り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d0山
部の平坦な山頂面を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.
85≦Sm≦1.7、Sm−D<280(μm)、30
≦d0≦500(μm)、20≦η≦85(%)を満足
するように構成されている塗装用鋼板である。On the other hand, exterior steel sheets for automobile bodies, home appliances, etc. are painted to give a beautiful appearance. At this time, it is necessary to prevent the diffuse reflection of the coated surface from impairing the beautiful appearance. It is required to have excellent properties. As a conventional technique as described above, Japanese Patent Laid-Open No. 62-168
There is Japanese Patent No. 602, "Steel for coating and its manufacturing method".
The content is such that the center line average roughness Ra of the surface is 0.3 to 2.
A groove having a trapezoidal peak portion having a flat top surface and having a microscopic shape in the range of 0 μm and constituting the surface roughness thereof and surrounding the whole or a part thereof. -Shaped valley portion and an intermediate flat portion that is formed between the peak portions and outside the valley portion and higher than the bottom of the valley portion and lower than or at the same height as the crest surface of the valley portion. In addition, the average center-to-center distance between adjacent peaks is Sm, the average diameter of the outer edges of the valleys is D, the average diameter of the flat peaks of the peaks is d 0 , and the flat peak of the peaks is the intermediate flat portion. When the ratio of the total area of the flat surfaces of No. 1 to the total area is defined as η (%), 0.
85 ≦ Sm ≦ 1.7, Sm−D <280 (μm), 30
The coating steel plate is configured to satisfy ≦ d 0 ≦ 500 (μm) and 20 ≦ η ≦ 85 (%).
【0004】上記の従来技術でのロール及び鋼板表面の
プロフィールを図4、図5(特開昭62−168602
号公報の第10、第11図)で示すと、以下のようにな
る。 D:ロール表面のフランジ2の平均外径=鋼板表面の谷
部11の外縁の平均直径 d:ロール表面のクレータ1の平均直径 d0:鋼板表面の山部10の平坦な山頂面8の平均直径 H:ロール表面のクレータ1の深さ h1:ロール表面のフランジ2の高さ=鋼板表面の中間
平坦部9から谷部11の底までの深さ h2:鋼板表面の山部10の平坦な山頂面8の中間平坦
部9からの高さ Sm:ロール表面の隣り合うクレータ1の平均中心間距
離=鋼板表面の隣り合う山部10の平均中心間距離 α:ロール表面のフランジ2の幅 η:平坦部の面積(山部10の平坦な山頂面8の面積占
有率η1と中間平坦部9の面積占有率η2との和)The profile of the surface of the roll and the steel sheet in the above-mentioned prior art is shown in FIGS. 4 and 5 (Japanese Patent Laid-Open No. 62-168602).
(Figs. 10 and 11 of the publication), it is as follows. D: Average outer diameter of flange 2 on roll surface = Average diameter of outer edge of valley 11 on steel plate surface d: Average diameter of crater 1 on roll surface d 0 : Average of flat crest surface 8 of mountain portion 10 on steel plate surface Diameter H: Depth of the crater 1 on the roll surface h 1 : Height of the flange 2 on the roll surface = Depth from the intermediate flat portion 9 of the steel plate surface to the bottom of the valley 11 h 2 : Of the mountain portion 10 of the steel plate surface Height of the flat crest surface 8 from the intermediate flat portion Sm: Average center-to-center distance between adjacent craters 1 on the roll surface = Average center-to-center distance between adjacent mountain portions 10 on the steel plate surface α: Of the flange 2 on the roll surface Width η: Area of flat portion (sum of area occupancy η 1 of the flat top surface 8 of the mountain portion 10 and area occupancy η 2 of the intermediate flat portion 9)
【0005】[0005]
【発明が解決しようとする課題】例えば自動車用外板で
あれば従来の技術でも塗装鮮映性及びプレス成形性が十
分に得られるが、自動車用内板では外板に比べ過酷なプ
レス成形性が要求されるために従来の技術の課題として
は、自動車用内板のように塗装鮮映性を劣化させずに過
酷なプレス成形性が要求されるものには適用されない欠
点を有している。鋼板表面での塗装鮮映性は一般的に鋼
板表面の平坦部が多いほど向上する。それに対して鋼板
表面でのプレス成形性は一般的に鋼板表面の凹部体積が
多いほど凹部を濡らすプレス加工用潤滑油も多く含むの
で良好となる。For example, in the case of an outer panel for an automobile, the conventional technique can sufficiently obtain the coating clarity and the press formability. However, the inner panel for an automobile has a severer press formability than the outer panel. However, the conventional technique has a drawback that it cannot be applied to automobile inner plates that require severe press formability without deteriorating coating clarity. . The sharpness of the coating on the surface of the steel sheet generally improves as the number of flat portions on the surface of the steel sheet increases. On the other hand, the press formability on the surface of the steel sheet is generally good because the larger the volume of the recess on the surface of the steel sheet, the more the lubricating oil for press working that wets the recess.
【0006】従来技術での凹部体積は凹部1つ当たりロ
ール表面のフランジ2の幅αを直径とした半円断面積の
環状(リング状)として、 u=(1/2)×(πα2/4)×π(D+d0)/2 (1) ロール表面のフランジ2の幅αは上記公報6頁4欄17
行より、 α=0.09×D (2) 1mm2当たりの凹部個数は、1mm=1000μmな
ので n=(1000/Sm)×(1000/Sm) (3) よって、1mm2当たりの凹部体積は V=u×n =4.99×103×(D+d0)/(Sm/D)2 (4) さらにD=d0+2α(図4、図5より)、d0=30〜
500μm、α=20〜40μm(上記公報8頁1欄1
9行より)なので、 V=(0.499〜5.389)×106/(Sm/D)2(5) 表1はSm/D、平坦部の面積η、1mm2当たりの凹
部体積Vとの関係を表すもので、平坦部の面積ηは上記
公報第2a表、第2b表より、1mm2当たりの凹部体
積Vは上記(5)式にSm/D;0.85〜1.75を
代入したものである。In the prior art, the volume of the recess is as follows: u = (1/2) × (πα 2 / with an annular (ring-shaped) cross section having a diameter of the flange 2 on the roll surface as the diameter per recess. 4) × π (D + d 0 ) / 2 (1) The width α of the flange 2 on the roll surface is 4 page 17 of the above publication.
From the line, α = 0.09 × D (2) Since the number of recesses per 1 mm 2 is 1 mm = 1000 μm, n = (1000 / Sm) × (1000 / Sm) (3) Therefore, the recess volume per 1 mm 2 is V = u × n = 4.99 × 10 3 × (D + d 0 ) / (Sm / D) 2 (4) Furthermore, D = d 0 + 2α (from FIGS. 4 and 5), d 0 = 30-
500 [mu] m, [alpha] = 20-40 [mu] m (page 1 column 1 of the above publication)
Since 9 rows), V = (0.499 to 5.389) × 10 6 / (Sm / D) 2 (5) Table 1 shows Sm / D, area η of the flat portion, and concave portion volume V per 1 mm 2. The area η of the flat portion is shown in Tables 2a and 2b of the publication, and the volume V of the concave portion per 1 mm 2 is Sm / D; 0.85 to 1.75 in the above equation (5). Is substituted.
【0007】[0007]
【表1】 [Table 1]
【0008】表1では平坦部の面積ηが0.29〜0.
87で1mm2当たりの凹部体積Vが0.163〜7.
459×106となる。自動車用内板のように塗装鮮映
性を劣化させずに過酷なプレス成形性が要求されるもの
には、従来技術に比べて1mm2当たりの凹部体積Vが
7.5×106を越えるもので、凹部を濡らす凹部体積
が多いプレス加工用潤滑油も多く含むものが要求され
る。In Table 1, the area η of the flat portion is 0.29 to 0.
87, the concave volume V per 1 mm 2 was 0.163 to 7.
It becomes 459 × 10 6 . For automobile inner plates that require severe press formability without deteriorating coating clarity, the volume V of recesses per 1 mm 2 exceeds 7.5 × 10 6 as compared with the prior art. However, it is required to include a large amount of lubricating oil for press working which has a large volume of the concave portion which wets the concave portion.
【0009】[0009]
【課題を解決するための手段】本発明は従来技術の課題
を有利に解決するものであって、鋼帯表面に微小且つ複
数の凹部を設け、該鋼帯の幅方向で端部の形状は、直径
dが50〜200μm、凹部深さhが16〜40μm、
鋼帯表面1mm2当たり凹部体積の合計が8×106μm
3以上を満足し、圧延方向に隣接する凹部間中心距離
(p1)=1.0d〜2.0d、圧延方向列の列間中心
距離(pc)=1.0d〜2.0dとし、該鋼帯の幅方
向で中央部の形状は、直径dが50〜200μm、凹部
深さhが2〜16μm、鋼板表面1mm2当たり凹部体
積の合計が0.10〜2×106μm3、鋼帯表面の凹部
を除く平坦部の面積率0.8以上を満足し、圧延方向に
隣接する凹部間中心距離(p1)=2.5d〜4.0
d、圧延方向列の列間中心距離(pc)=2.5d〜
4.0dとした事を特徴とする塗装鮮映性及びプレス成
形性の優れた鋼帯である。The present invention advantageously solves the problems of the prior art, in which minute and plural recesses are provided on the surface of a steel strip, and the shape of the end portion in the width direction of the steel strip is , Diameter d is 50 to 200 μm, recess depth h is 16 to 40 μm,
The total volume of recesses per 1 mm 2 of steel strip surface is 8 × 10 6 μm
3 or more are satisfied, and the center distance between concave portions adjacent to each other in the rolling direction (p 1 ) = 1.0 d to 2.0 d, and the center distance between rows of rolling direction rows (pc) = 1.0 d to 2.0 d , The shape of the central portion in the width direction of the steel strip has a diameter d of 50 to 200 μm, a recess depth h of 2 to 16 μm, and a total recess volume per 1 mm 2 of the steel plate surface of 0.10 to 2 × 10 6 μm 3 . The area ratio of the flat part excluding the recesses on the surface of the steel strip is 0.8 or more, and the center distance between the recesses adjacent to each other in the rolling direction (p 1 ) = 2.5d to 4.0.
d, inter-column center distance (p c) in the rolling direction rows = 2.5D~
It is a steel strip excellent in coating clarity and press formability, which is characterized by being 4.0d.
【0010】以下、本発明を図面に基づいて説明する。
図1(A)は、本発明で用いるロールの断面形状であ
る。ロール3の表面にレーザーを照射して、直径50〜
200μmの穴を形成する。鋼帯の端部に対向する部分
で、4は穴5の上に付着したロール表面より高さHが1
6〜40μmの範囲になるように突出したクロムを主成
分とする突起であり、圧延方向に隣接する穴2間中心距
離(p1)=1.0D〜2.0D、圧延方向列の列間中
心距離(pc)=1.0D〜2.0D間隔で配設する。
鋼帯の中央部に対向する部分で、4は穴5の上に付着し
たロール表面より高さHが2〜16μmの範囲になるよ
うに突出したクロムを主成分とする突起であり、圧延方
向に隣接する穴2間中心距離(p1)=2.5D〜4.
0D、圧延方向列の列間中心距離(pc)=2.5D〜
4.0D間隔で配設する。The present invention will be described below with reference to the drawings.
FIG. 1A is a cross-sectional shape of a roll used in the present invention. The surface of the roll 3 is irradiated with a laser to have a diameter of 50 to
A hole of 200 μm is formed. 4 is a portion facing the end of the steel strip and has a height H of 1 from the roll surface attached on the hole 5.
It is a protrusion containing chromium as a main component and protruding so as to be in the range of 6 to 40 μm, and the center distance between the holes 2 adjacent to each other in the rolling direction (p 1 ) = 1.0D to 2.0D, between rows in the rolling direction row. to dispose at center distance (p c) = 1.0D~2.0D intervals.
In a portion facing the central portion of the steel strip, 4 is a protrusion containing chromium as a main component, which protrudes so that the height H is in the range of 2 to 16 μm from the surface of the roll attached to the hole 5, and the rolling direction Distance between the holes 2 adjacent to each other (p 1 ) = 2.5D to 4.
0D, inter-column center distance (p c) in the rolling direction rows = 2.5D~
It is arranged at intervals of 4.0D.
【0011】突起4の高さHが40μmを越えると、圧
延時に突起4がロール表面より脱落したり、圧延荷重に
よる破壊を引き起こすことがあるため、この突起4の高
さは低い程良く40μm以下程度が好ましい。しかし2
μmより低くなると、鋼板表面に転写する凹部深さが低
く、粗度も小さくなり、本発明の目的が達成できないま
た、図1(B)には、上記した表面形状を有するロール
にて調質圧延し、40〜100%の割合で転写された本
発明による鋼板の断面形状を示す。なお、40%以下の
転写率では、鋼板表面に転写する凹部深さが低く、粗度
も小さくなり、本発明の目的が達成できない。If the height H of the protrusions 4 exceeds 40 μm, the protrusions 4 may fall off the roll surface during rolling or cause breakage due to the rolling load. Therefore, the lower the height of the protrusions 4, the better 40 μm or less. A degree is preferable. But 2
If it is less than μm, the depth of the recesses transferred to the surface of the steel sheet is low, and the roughness is also low, so that the object of the present invention cannot be achieved. Further, in FIG. 2 shows the cross-sectional shape of a steel sheet according to the invention rolled and transferred at a rate of 40-100%. If the transfer rate is 40% or less, the depth of the recesses transferred to the surface of the steel sheet will be low, and the roughness will be low, so that the object of the present invention cannot be achieved.
【0012】図2は、本発明による鋼板表面の平面図を
模式的に示したもので、鋼板7表面に、直径50〜20
0μmの凹部を形成される。鋼帯の端部では、凹部の穴
高さhが16〜40μmの範囲である突起であり、圧延
方向に隣接する穴2間中心距離(P1)=1.0D〜
2.0D、圧延方向列の列間中心距離(P2)=1.0
D〜2.0D間隔で配設する。鋼帯の中央部では、凹部
の穴高さhが2〜16μmの範囲である突起であり、圧
延方向に隣接する穴2間中心距離(P1)=2.5D〜
4.0D、圧延方向列の列間中心距離(P2)=2.5
D〜4.0D間隔で配設する。FIG. 2 is a schematic plan view of the surface of the steel sheet according to the present invention.
A recess of 0 μm is formed. At the end of the steel strip, the hole height h of the recess is a protrusion in the range of 16 to 40 μm, and the center distance between the holes 2 adjacent to each other in the rolling direction (P 1 ) = 1.0 D
2.0D, rolling center row-to-row center distance (P 2 ) = 1.0
It is arranged at intervals of D to 2.0D. In the central part of the steel strip, the hole height h of the recess is a projection having a range of 2 to 16 μm, and the center distance between the holes 2 adjacent to each other in the rolling direction (P 1 ) = 2.5D
4.0D, center distance between rows of rolling direction row (P 2 ) = 2.5
They are arranged at intervals of D to 4.0D.
【0013】自動車用内板等の鮮映性とプレス性の両方
の機能を要求される部材においては、このピッチをあま
り大きくすると、鋼板表面粗度が低下し、圧延時にスベ
リの発生、伸率変動による材質低下、等の鋼板品位低下
及び、プレス性の低下等の問題を招く。鋼帯の中央部で
のピッチの上限を4.0Dとする。また、あまり小さく
すると、鋼板表面のうねりの増加による塗装後の鮮映性
低下を招くため、鋼帯の中央部でのピッチの下限を2.
5Dとし、鋼帯の端部でのピッチの上限を1.5Dとす
る。ピッチが1.0D未満になると、凹部の穴同士が重
なり著しくプレス成形性を劣化させるため、鋼帯の端部
でのピッチの下限を1.0Dとする。鋼板凹部深さの上
限は、前記に示した突起4の高さより40μmとし、凹
部の深さが2μmより低くなると、鋼板表面の凹部深さ
が低く粗度も小さくなり本発明の目的が達成できない。In a member such as an inner plate for automobiles, which is required to have both functions of image clarity and pressability, if the pitch is too large, the surface roughness of the steel sheet is lowered, and slippage and elongation at rolling occur. This causes problems such as deterioration of material due to fluctuations, deterioration of steel plate quality and deterioration of pressability. The upper limit of the pitch at the center of the steel strip is 4.0D. On the other hand, if it is made too small, the waviness on the surface of the steel sheet will increase and the image clarity after coating will deteriorate. Therefore, the lower limit of the pitch at the center of the steel strip is set to 2.
The upper limit of the pitch at the end of the steel strip is 1.5D. If the pitch is less than 1.0D, the holes of the recesses overlap each other and the press formability is significantly deteriorated. Therefore, the lower limit of the pitch at the end of the steel strip is set to 1.0D. The upper limit of the depth of the recess of the steel plate is 40 μm from the height of the protrusion 4 described above, and when the depth of the recess is lower than 2 μm, the depth of the recess on the surface of the steel plate is low and the roughness is small, and the object of the present invention cannot be achieved. .
【0014】なお鋼板凹部形状、プレス時の油溜め効
果、及び鋼板表面への潤滑効果等を考慮すると、台形、
及び角状の物も考えられ、鋼板凹部形状は、いかなる形
状でもかまわない。この方法を適用すれば従来のような
中途はんぱな粗度パターンを採用する必要はなく、幅中
央部は思いきって鮮映性に優れたパターンを、幅端部は
プレス性すなわち型かじり性の良好なパターンを採用す
ることが可能となり、鋼板の可能性を大幅に拡大するこ
とができる。すなわち本発明の薄鋼板は、鋼板表面の粗
度パターンが、幅方向で、端部と中央部とで異なる鋼板
である。Considering the recess shape of the steel plate, the oil sump effect at the time of pressing, the lubrication effect on the surface of the steel plate, etc.
Also, a square-shaped object is conceivable, and the recess shape of the steel plate may be any shape. If this method is applied, it is not necessary to adopt a halfway roughness pattern as in the past, and a pattern with excellent sharpness is made at the center of the width, and pressability, that is, mold scuffing at the width end. A good pattern can be adopted, and the possibility of steel plate can be greatly expanded. That is, the thin steel sheet of the present invention is a steel sheet in which the roughness pattern on the surface of the steel sheet is different between the end portion and the central portion in the width direction.
【0015】本発明による平坦部の面積ηをもとめるに
あたって、鋼帯の幅方向の端部は最初に1mm2当たり
の凹部個数nは、1mm=1000μmなので n=(1000/P1)×(1000/P2) (6) 平坦部の面積率ηは凹部が直径dの円形部を除くのでP
1=P2=Pとすると、 η=1−(πd2/4)×n/(1000×1000) =1−(π/4)×(d/P)2 (7) P=1.0d〜2.0dであるので、 η=0.215〜0.804 (8) となる。In determining the area η of the flat portion according to the present invention, the number n of recesses per 1 mm 2 at the end portion in the width direction of the steel strip is 1 mm = 1000 μm, so n = (1000 / P 1 ) × (1000 / P 2 ) (6) The area ratio η of the flat part is P because the concave part excludes the circular part with the diameter d.
When 1 = P 2 = P, η = 1- (πd 2/4) × n / (1000 × 1000) = 1- (π / 4) × (d / P) 2 (7) P = 1.0d Since it is ~ 2.0d, η = 0.215-0.804 (8).
【0016】本発明による1個当たりの凹部体積は u=(πd2/4)×h (9) とすると、本発明による1mm2当たりの凹部体積は、
P1=P2=Pとし、h=16〜40μmであるので、 V=u×n =(π/4)×(d/P)2×h×106 =h×(1−η)×106 =(16〜40)×(1−η)×106(μm3/mm2)(10) となる。表2に本発明による鋼帯の幅方向の端部での平
坦部面積率ηと1mm2当たりの凹部体積Vとの関係を
(10)式を用いて示す。The recess volume per one according to the invention is u = When (πd 2/4) × h (9), the recess volume per 1 mm 2 according to the present invention,
Since P 1 = P 2 = P and h = 16 to 40 μm, V = u × n = (π / 4) × (d / P) 2 × h × 10 6 = h × (1-η) × 10 6 = (16-40) × (1−η) × 10 6 (μm 3 / mm 2 ) (10). Table 2 shows the relationship between the flat area ratio η at the widthwise end of the steel strip according to the present invention and the recess volume V per 1 mm 2 by using the equation (10).
【0017】[0017]
【表2】 [Table 2]
【0018】表2の括弧内の数字は(10)式の計算上
であって、本発明では1mm2当たりの凹部体積Vの下
限は8.00×106(μm3/mm2)である。表2で
は平坦部の面積率ηが0.215〜0.840で1mm
2当たりの凹部体積Vが8.00〜39.25×106と
なる。自動車用内板のように塗装鮮映性を劣化させずに
過酷なプレス成形性が要求されるものには、1mm2当
たりの凹部体積Vが8.00×106未満であると、凹
部を濡らすプレス加工用潤滑油が十分でないためプレス
加工後に鋼板表面にひび割れ疵が多発するのでVの下限
は8.00×106(μm3/mm2)とする。The numbers in parentheses in Table 2 are for the calculation of the equation (10), and in the present invention, the lower limit of the concave volume V per 1 mm 2 is 8.00 × 10 6 (μm 3 / mm 2 ). . In Table 2, the area ratio η of the flat portion is 0.215 to 0.840 and 1 mm.
The concave volume V per 2 is 8.00 to 39.25 × 10 6 . In the case of an automobile inner plate that requires severe press formability without deteriorating the coating clarity, if the recess volume V per 1 mm 2 is less than 8.00 × 10 6 , The lower limit of V is 8.00 × 10 6 (μm 3 / mm 2 ) because the surface of the steel sheet is frequently cracked after pressing because there is not enough lubricating oil for press working.
【0019】本発明による平坦部面積率ηをもとめるに
あたって、鋼板の幅方向の中央部は最初に1mm2当た
りの凹部個数nは、1mm=1000μmなので n=(1000/p1)×(1000/P2) (6)’ 平坦部の面積率ηは凹部が直径dの円形部を除くのでP
1=P2=Pとすると、 η=1−(πd2/4)×n/(1000×1000) =1−(π/4)×(d/P)2 (7)’ P=2.5d〜4.0dであるので、(ηの下限を0.
6なので) η=0.874〜0.951 (8)’ となる。In determining the flat area ratio η according to the present invention, since the number of recesses n per 1 mm 2 is 1 mm = 1000 μm at the center in the width direction of the steel sheet, n = (1000 / p 1 ) × (1000 / P 2 ) (6) ′ The area ratio η of the flat portion is P because the concave portion excludes the circular portion having the diameter d.
When 1 = P 2 = P, η = 1- (πd 2/4) × n / (1000 × 1000) = 1- (π / 4) × (d / P) 2 (7) 'P = 2. Since it is 5d to 4.0d, (the lower limit of η is 0.
Therefore, η = 0.874 to 0.951 (8) ′.
【0020】本発明による1個当りの凹部体積は u=(πd2/4)×h (9)’ とすると、本発明による1mm2当たりの凹部体積は、
P1=P2=Pとし、h=2〜16μmであるので、 V=u×n =(π/4)×(d/P)2×h×106 =h×(1−η)×106 =(2〜16)×(1−η)×106(μm3/mm2)(10)’ となる。表3に本発明による鋼帯の幅方向中央部での平
坦部面積率ηと1mm2当たりの凹部体積Vとの関係を
(10)’式を用いて示す。The recess volume per according to the invention When u = (πd 2/4) × h (9) ', the recess volume per 1 mm 2 according to the present invention,
Since P 1 = P 2 = P and h = 2 to 16 μm, V = u × n = (π / 4) × (d / P) 2 × h × 10 6 = h × (1-η) × 10 6 = (2 to 16) × (1−η) × 10 6 (μm 3 / mm 2 ) (10) ′. Table 3 shows the relationship between the flat area ratio η in the widthwise central portion of the steel strip according to the present invention and the recess volume V per 1 mm 2 using the equation (10) ′.
【0021】[0021]
【表3】 [Table 3]
【0022】表3では平坦部の面積率ηが0.874〜
0.951で1mm2当たりの凹部体積Vが0.10〜
2.0×106(μm3〜mm2)となる。自動車用外板
のようにプレス成形性を劣化させずに塗装鮮映性の向上
が要求されるものでは同一な1mm2当たりの凹部体積
Vに対して、平坦部の面積率ηが大きいものが良い。図
6に表3における平坦部の面積率ηと1mm2当たりの
凹部体積Vとの関係図を示す。In Table 3, the area ratio η of the flat portion is 0.874 to
At 0.951, the concave volume V per 1 mm 2 is 0.10 to
It is 2.0 × 10 6 (μm 3 to mm 2 ). In the case where the improvement of the coating clarity is required without deteriorating the press formability such as the outer panel for automobiles, the area ratio η of the flat part is large with respect to the same concave volume V per 1 mm 2. good. FIG. 6 shows a relationship diagram between the area ratio η of the flat portion and the recess volume V per 1 mm 2 in Table 3.
【0023】[0023]
【実施例】図3は本発明による鋼板を製造するためのロ
ールの製造法についての説明図である。本発明は、まず
図3(A)に示す様に、ロール3表面に約20〜30μ
mの樹脂6を被覆する。被覆する樹脂は、耐アルカリ性
・耐クロム酸性・絶縁性等の性質を有し、後工程で除去
が容易である様にアルカリ系樹脂及びメッキシール用樹
脂等が好ましく、ロール表面に16〜50μmの厚さと
なる様に被覆する。被覆の方法としては、ロール非回転
によるロール引き抜き法、電着塗装法、及びロール回転
によるロールコーター、スプレーによる吹きつけ、カー
テンコーター、粉体塗装法、フィルム状樹脂等を巻きつ
ける、等の手段でロール表面に均一に付着させ乾燥させ
る。EXAMPLE FIG. 3 is an explanatory view of a method of manufacturing a roll for manufacturing a steel sheet according to the present invention. According to the present invention, first, as shown in FIG.
m of resin 6 is coated. The resin to be coated has properties such as alkali resistance, chrome acid resistance, and insulation properties, and is preferably an alkali resin or a resin for plating and sealing so that it can be easily removed in a later step. Coat to a thickness. As a coating method, roll drawing method by non-rotating roll, electrodeposition coating method, roll coater by roll rotation, spraying by spraying, curtain coater, powder coating method, winding of film-like resin, etc. To evenly adhere to the roll surface and dry.
【0024】次いで、図3(B)に示す様に、樹脂を被
覆したロール3は高密度エネルギー、例えばレーザービ
ーム12により加工を受ける。即ち、レーザービーム1
2を被覆した樹脂6の表面から照射して、その部分の樹
脂を溶解除去する。樹脂が溶解除去された後の穴凹部1
3径は、レーザー照射条件、特にレーザー出力、集光レ
ンズ〜ロール間ギャップ(焦点ずれ)により調整するこ
とができ、本発明においては、穴径が50〜500μm
の範囲になる様にレーザー照射条件を選定する。上記し
たロール表面にレーザー加工を行うには、樹脂被覆した
ロールを回転させながらレーザー加工ヘッドを移動さ
せ、あらかじめ設定されたピッチ間隔Pに基づく加工周
波数、ロール回転数にてレーザーを照射して行う。Next, as shown in FIG. 3B, the resin-coated roll 3 is processed by high-density energy, for example, a laser beam 12. That is, laser beam 1
Irradiation is performed from the surface of the resin 6 coated with 2 to dissolve and remove the resin in that portion. Hole recess 1 after resin is dissolved and removed
The three diameters can be adjusted by laser irradiation conditions, in particular, laser output and the gap between the condensing lens and the roll (focus shift). In the present invention, the hole diameter is 50 to 500 μm.
The laser irradiation conditions are selected so that the range is within the range. In order to perform the laser processing on the roll surface, the laser processing head is moved while rotating the resin-coated roll, and the laser is irradiated at the processing frequency based on the preset pitch interval P and the roll rotation number. .
【0025】レーザー加工後、図3(C)に示す様に、
本発明ロールをクロムメッキ溶液中でクロムメッキ14
を行う。メッキ条件はクロムメッキ酸溶液中で20〜5
0A/dm2の電流密度、及び樹脂が溶解除去された後
の凹部直径、即ちクロムメッキ部有効面積比に応じた投
入電流2000A〜20000A等の条件で電解メッキ
を行うことにより、前記でレーザー加工によって形成さ
れた穴径5〜20μmの厚みでクロム突起を付着するこ
とができる。この際、樹脂が絶縁物質であるため、クロ
ムその表面に付着することなく、設定したメッキ条件に
より、樹脂の厚さとほぼ同等、またはそれ以下の厚さに
て、穴の部分だけにメッキされる。図3(C)は、クロ
ムメッキ後の表面状態を示すもので、樹脂6及びロール
3表面によって形成された穴凹部13に、電解メッキさ
れた曲面状のクロム突起15が付着している。次いで、
図3(D)に示す様に、クロム突起15を有するロール
は、溶剤を溶かした溶媒中に浸漬するか、溶剤でブラッ
シングするなどして、表面の樹脂を除去する。そして、
図3(D)に示すごとく、樹脂を除去したロール3の表
面には、クロム突起15が表出する。After laser processing, as shown in FIG.
The roll of the present invention is plated with chrome in a chrome plating solution.
I do. The plating conditions are 20 to 5 in a chromic acid solution.
Laser processing is performed by performing electroplating under conditions such as a current density of 0 A / dm 2 and a recess diameter after the resin is dissolved and removed, that is, a charging current of 2000 A to 20000 A according to an effective area ratio of a chromium plating portion. The chromium protrusions can be attached with a hole diameter of 5 to 20 μm formed by the above method. At this time, since the resin is an insulating substance, it does not adhere to the surface of the chromium, and is plated only on the hole portion with a thickness almost equal to or less than the thickness of the resin depending on the set plating conditions. . FIG. 3C shows the surface state after chrome plating, in which the electroplated curved chrome projections 15 are attached to the hole recesses 13 formed by the resin 6 and the surface of the roll 3. Then
As shown in FIG. 3D, the roll having the chromium projections 15 is immersed in a solvent in which the solvent is dissolved or brushed with the solvent to remove the resin on the surface. And
As shown in FIG. 3D, the chromium protrusions 15 are exposed on the surface of the roll 3 from which the resin has been removed.
【0026】まず、発明者らは自動車外板のプレス方法
について詳細に検討した。その結果一般にドア等の外板
は、7図aに示すように、鋼板7に沿って点線16の形
状の如くブランク(打抜き)され、そして実線17の形
状でプレスに供される。プレス品の断面は7図bに示す
ように比較的平坦な中央部(B)と、プレス時に大きな
変形を受ける端部(A)、(C)とから成る。成品の段
階では(A)、(C)部は殆んど目に触れることはな
い。それに対して(B)部は外観が重要な部分ではある
が、プレス時の変形は非常に小さい。したがってプレス
成形性は幅10〜20cm程度の(A)、(C)部によ
って支配され、鮮映性は(B)部によって支配されるこ
とがわかった。First, the inventors examined in detail the pressing method for the automobile outer panel. As a result, in general, the outer plate of the door or the like is blanked (punched) along the steel plate 7 in the shape of the dotted line 16 and then pressed in the shape of the solid line 17 as shown in FIG. The cross section of the pressed product is composed of a relatively flat central part (B) and end parts (A) and (C) which undergo large deformation during pressing, as shown in FIG. 7B. The parts (A) and (C) are barely visible in the product stage. On the other hand, part (B) is a part where the appearance is important, but the deformation during pressing is very small. Therefore, it was found that the press formability was controlled by the (A) and (C) parts having a width of about 10 to 20 cm, and the sharpness was controlled by the (B) part.
【0027】本発明のロールを用いて、0.75mm厚
さの冷延鋼板を調質圧延し、ロール表面に形成した粗面
を鋼板に転写し、鋼帯の幅方向端部の鋼板形状パターン
を表4に示す。直径d(μm)、凹部間中心距離P
1(μm)、圧延方向列の列間中心距離P2(μm)、凹
部深さh(μm)、平坦部の面積率η、鋼板表面1mm
2当たり凹部体積V(×106μm3/mm2)に対して、
自動車用内板の評価テストとして、加工後にひび割れの
有無(プレス・加工性)を調査し且つ限界絞り比(L,
D,R)にて評価した。このL,D,Rはポンチ径32
mmの金型を用いて深絞りしうる最大素板径を求め、そ
の最大素板径とポンチ径との比から求めたものである。
本発明の鋼板は、No.1〜9までで、比較例をNo.
10〜12で示す。塗装鮮映性を劣化させずに過酷なプ
レス成形性が要求されるものには、1mm2当たりの凹
部体積Vが8.00×106未満であると、凹部を濡ら
すプレス加工用潤滑油が十分でないためプレス加工後に
鋼板表面にひび割れ疵が多発するのでVの下限は8.0
0×106(μm3/mm2)となる。Using the roll of the present invention, a cold rolled steel sheet having a thickness of 0.75 mm is temper-rolled, the rough surface formed on the roll surface is transferred to the steel sheet, and the steel sheet shape pattern of the widthwise end portion of the steel strip is obtained. Is shown in Table 4. Diameter d (μm), center distance between recesses P
1 (μm), center distance between rows of rolling direction P 2 (μm), recess depth h (μm), flat area ratio η, steel plate surface 1 mm
With respect to the concave volume V per 2 (× 10 6 μm 3 / mm 2 ),
As an evaluation test for inner plates for automobiles, the presence or absence of cracks (pressing / workability) after processing is investigated and the limit drawing ratio (L,
It was evaluated by D, R). These L, D, R are punch diameter 32
This is obtained by finding the maximum diameter of the blank that can be deep-drawn using a mm die, and by using the ratio between the maximum diameter of the blank and the punch diameter.
The steel sheet of the present invention is No. 1 to 9, the comparative example No.
It shows with 10-12. If the recess volume V per 1 mm 2 is less than 8.00 × 10 6 , a lubricating oil for press working that wets the recesses is required for those requiring severe press formability without deteriorating the coating clarity. Since it is not sufficient, cracks often occur on the surface of the steel sheet after pressing, so the lower limit of V is 8.0.
It becomes 0 × 10 6 (μm 3 / mm 2 ).
【0028】[0028]
【表4】 [Table 4]
【0029】本発明の鋼帯中央部での鋼板形状パターン
を表5に示す。直径d(μm)、凹部間中心距離P
1(μm)、圧延方向列の列間中心距離P2(μm)、凹
部深さh(μm)、平坦部の面積率η、鋼板表面1mm
2当たり凹部体積V(×106μm 3/mm2)に対して、
評価テストとして、鋼板の各形状パターンについてリン
酸塩による化成処理を行い、化成処理後、下塗り、カチ
オンED塗料18〜20μm厚さ、中塗り30〜35μ
m厚さ、ないしは、上塗り、トップコート30〜35μ
m厚さの2コートまたは3コートの塗装を施した。その
塗装後の塗装表面の鮮映性評価として鮮映度計によるN
SI値の測定を行った。Steel plate shape pattern in the central portion of the steel strip of the present invention
Is shown in Table 5. Diameter d (μm), center distance between recesses P
1(Μm), center distance P between rows in rolling direction2(Μm), concave
Part depth h (μm), flat area ratio η, steel plate surface 1 mm
2Contact concave volume V (× 106μm 3/ Mm2),
As an evaluation test, phosphorus is applied to each shape pattern of the steel sheet.
After chemical conversion treatment with acid salt, after chemical conversion treatment, undercoat, click
On-ED coating 18 to 20 μm thick, intermediate coating 30 to 35 μm
m thickness or topcoat, topcoat 30-35μ
2 or 3 coats of m thickness were applied. That
N is measured by a freshness meter as a sharpness evaluation of the painted surface after painting.
The SI value was measured.
【0030】その結果について、鮮映性(NSI値)な
らびにプレス加工性と共に表5に示す。なお本発明の鋼
板はNo.1〜9までで、比較例をNo.10〜12で
示す。自動車用外板等に要求されるプレス成形性を劣化
させずに塗装鮮映性を満足するには1mm2当たりの凹
部体積Vが8.00×106あれば充分であり、これ以
上でもよいが逆に平坦度の面積率ηが減少するので、上
記の値を上限とした。一方1mm2当たりの凹部体積V
が8.00×106未満であると、自動車用外板等に要
求されるプレス成形性を劣化し、加工用潤滑油が十分で
ないためプレス加工後に鋼板表面にひび割れ疵が多発す
るのでVの下限は1.00×106(μm3/mm2)と
なる。The results are shown in Table 5 together with the image clarity (NSI value) and the press workability. The steel sheet of the present invention is No. 1 to 9, the comparative example No. It shows with 10-12. In order to satisfy the coating image clarity without deteriorating the press moldability required for automobile outer panels, the volume V of recesses per 1 mm 2 of 8.00 × 10 6 is sufficient and may be more. On the contrary, since the area ratio η of the flatness decreases, the above value was made the upper limit. On the other hand, the concave volume V per 1 mm 2
Of less than 8.00 × 10 6 deteriorates the press formability required for outer plates for automobiles, etc., and since the lubricating oil for processing is insufficient, cracks frequently occur on the surface of the steel sheet after pressing, so V The lower limit is 1.00 × 10 6 (μm 3 / mm 2 ).
【0031】[0031]
【表5】 [Table 5]
【0032】図6は、本発明による鋼板と従来技術によ
る鋼板との平坦部の面積率ηと鋼板表面1mm2当たり
凹部体積V(×106μm3/mm2)との関係を示す図
である。従来技術による鋼板は全て凹部体積Vが8.0
0×106未満であるのに対して本発明による鋼板の幅
方向端部は凹部体積Vが8.00×106以上となり、
プレス成形性がすぐれている。本発明による鋼板の中央
部は従来技術に比べて平坦部の面積率が高く、鮮映性も
すぐれている。FIG. 6 is a graph showing the relationship between the flat area ratio η of the steel sheet according to the present invention and the steel sheet according to the prior art and the recess volume V (× 10 6 μm 3 / mm 2 ) per 1 mm 2 of the steel sheet surface. is there. All the steel sheets according to the prior art have a recess volume V of 8.0.
While it is less than 0 × 10 6 , the width direction end portion of the steel sheet according to the present invention has a recess volume V of 8.00 × 10 6 or more,
Excellent press formability. In the central portion of the steel sheet according to the present invention, the area ratio of the flat portion is higher than that of the prior art and the sharpness is excellent.
【0033】[0033]
【発明の効果】本発明によって、従来のレーザー鋼板に
比較しプレス性と塗装後の高鮮映性を兼ね備えた冷延鋼
板の製造が可能となるとともに、従来出来なかった自動
車用鋼板のプレス加工特性も良く、ひび割れ等の品質問
題も解決する事が可能とならしめた。EFFECTS OF THE INVENTION According to the present invention, it is possible to manufacture a cold rolled steel sheet having both pressability and high image clarity after coating, as compared with conventional laser steel sheets, and press working of automobile steel sheets, which could not be done conventionally. The characteristics are good and it is possible to solve quality problems such as cracks.
【図1】本発明で用いるロール及び鋼板の断面形状を示
す図。FIG. 1 is a view showing a sectional shape of a roll and a steel plate used in the present invention.
【図2】本発明による鋼板表面の平面図を模式的に示し
た図。FIG. 2 is a diagram schematically showing a plan view of a steel plate surface according to the present invention.
【図3】本発明による鋼板を製造するためのロールの製
造工程を示す図。FIG. 3 is a diagram showing a manufacturing process of a roll for manufacturing a steel sheet according to the present invention.
【図4】従来技術でのロール及び鋼板表面のプロフィー
ルを示す図。FIG. 4 is a view showing a profile of a roll and a surface of a steel plate according to a conventional technique.
【図5】従来の技術でのロール及び鋼板表面の断面図。FIG. 5 is a cross-sectional view of a surface of a roll and a steel plate according to a conventional technique.
【図6】平坦部の面積率と凹部体積との関係図。FIG. 6 is a diagram showing the relationship between the area ratio of a flat portion and the volume of a recess.
【図7】自動車外板の形状を示す図である。FIG. 7 is a diagram showing a shape of an automobile outer plate.
1 ロール表面のクレータ 2 ロール表面のフランジ 3 ロール 4 突起 5 穴 6 樹脂 7 鋼板 8 平坦な山頂面 9 鋼板表面の中間平坦部 10 鋼板表面の山部 11 鋼板表面の谷部 12 レーザービーム 13 穴凹部 14 クロムメッキ 15 クロム突起 16 点線 17 実線 1 Roll surface crater 2 Roll surface flange 3 Roll 4 Protrusion 5 Hole 6 Resin 7 Steel plate 8 Flat crest surface 9 Intermediate flat part of steel plate surface 10 Steel plate surface mountain part 11 Steel plate surface trough 12 Laser beam 13 Hole recess 14 Chrome plating 15 Chrome protrusion 16 Dotted line 17 Solid line
───────────────────────────────────────────────────── フロントページの続き (72)発明者 塩沢 修一 千葉県君津市君津1番地 新日本製鐵株 式会社 君津製鐵所内 (56)参考文献 特開 平2−37902(JP,A) 特開 平3−204103(JP,A) 特開 昭63−281715(JP,A) 特開 平5−69006(JP,A) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shuichi Shiozawa 1 Kimitsu, Kimitsu-shi, Chiba Nippon Steel Co., Ltd. Inside the Kimitsu Works (56) Reference JP-A-2-37902 (JP, A) 3-204103 (JP, A) JP-A-63-281715 (JP, A) JP-A 5-69006 (JP, A)
Claims (1)
該鋼帯の幅方向で端部の形状は、直径dが50〜200
μm、凹部深さhが16〜40μm、鋼帯表面1mm2
当たり凹部体積の合計が8×106μm3以上を満足し、
圧延方向に隣接する凹部間中心距離(p1)=1.0d
〜2.0d、圧延方向列の列間中心距離(pc)=1.
0d〜2.0dとし、該鋼帯の幅方向で中央部の形状
は、直径dが50〜200μm、凹部深さhが2〜16
μm、鋼板表面1mm2当たり凹部体積の合計が0.1
0〜2×106μm3、鋼帯表面の凹部を除く平坦部の面
積率0.8以上を満足し、圧延方向に隣接する凹部間中
心距離(p1)=2.5d〜4.0d、圧延方向列の列
間中心距離(pc)=2.5d〜4.0dとした事を特
徴とする塗装鮮映性及びプレス成形性の優れた鋼帯。1. A microscopic plurality of recesses are provided on the surface of a steel strip,
The shape of the end portion in the width direction of the steel strip has a diameter d of 50 to 200.
μm, recess depth h is 16 to 40 μm, steel strip surface 1 mm 2
The total volume of the concave portions per contact satisfies 8 × 10 6 μm 3 or more,
Center distance between concave portions adjacent to each other in the rolling direction (p 1 ) = 1.0 d
˜2.0 d, center distance between rows of rolling direction rows (p c ) = 1.
0d to 2.0d, and the shape of the central portion in the width direction of the steel strip has a diameter d of 50 to 200 μm and a recess depth h of 2 to 16
μm, the total volume of recesses per 1 mm 2 of steel plate surface is 0.1
0 to 2 × 10 6 μm 3 , the area ratio of the flat portion excluding the recesses of the steel strip surface of 0.8 or more, and the center distance between recesses adjacent to each other in the rolling direction (p 1 ) = 2.5d to 4.0d A steel strip having excellent coating clarity and press formability, characterized in that the center distance (p c ) between rows in the rolling direction is 2.5d to 4.0d.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4066728A JP2530968B2 (en) | 1992-03-25 | 1992-03-25 | Steel strip with excellent paint clarity and press formability |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4066728A JP2530968B2 (en) | 1992-03-25 | 1992-03-25 | Steel strip with excellent paint clarity and press formability |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05269504A JPH05269504A (en) | 1993-10-19 |
JP2530968B2 true JP2530968B2 (en) | 1996-09-04 |
Family
ID=13324246
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4066728A Expired - Lifetime JP2530968B2 (en) | 1992-03-25 | 1992-03-25 | Steel strip with excellent paint clarity and press formability |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2530968B2 (en) |
-
1992
- 1992-03-25 JP JP4066728A patent/JP2530968B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05269504A (en) | 1993-10-19 |
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