JPH0623409B2 - High image clarity steel plate - Google Patents
High image clarity steel plateInfo
- Publication number
- JPH0623409B2 JPH0623409B2 JP62087922A JP8792287A JPH0623409B2 JP H0623409 B2 JPH0623409 B2 JP H0623409B2 JP 62087922 A JP62087922 A JP 62087922A JP 8792287 A JP8792287 A JP 8792287A JP H0623409 B2 JPH0623409 B2 JP H0623409B2
- Authority
- JP
- Japan
- Prior art keywords
- steel plate
- steel sheet
- waviness
- image clarity
- surface roughness
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/005—Rolls with a roughened or textured surface; Methods for making same
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Body Structure For Vehicles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Metal Rolling (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） この発明は塗装した鋼板の表面が高い鮮映性を示す高鮮
映性鋼板に関する。Description: TECHNICAL FIELD The present invention relates to a high-visibility steel sheet in which the surface of a coated steel sheet exhibits a high sharpness.
高鮮映性鋼板は自動車や家電製品の外板、建築外装材そ
の他に用いられる。High image clarity steel sheets are used for outer panels of automobiles and home appliances, building exterior materials and others.
（従来の技術） 自動車に対するユーザーニーズは年々高級化指向を強め
ている。なかでも、自動車の外観については光沢の鮮や
かさ、いわゆる塗装鮮映性がその商品イメージを決定す
る重要なファクターとして近年急速に脚光を浴びてきて
いる。また、家電製品の外板や建築外装材などにおいて
も、塗装面の良好な鮮映性は商品価値を一層高めるもの
である。(Prior Art) User needs for automobiles are becoming more sophisticated year by year. Among them, in terms of the appearance of automobiles, in recent years, the vividness of gloss, that is, the so-called paint clarity, has been rapidly spotlighted as an important factor in determining the product image. In addition, even in the case of outer panels of home appliances and building exterior materials, good sharpness of the painted surface further enhances the commercial value.
第３図（ロ）は従来の鋼板Ｓの表面に塗膜Ｐを形成した
もので、図面に示すように鋼板自体のうねりがそのまま
塗膜表面のうねりとなって残っている。したがって、塗
装面に入射した光は塗装面より多方向に反射されるの
で、鮮映性は減じる。In FIG. 3B, a coating film P is formed on the surface of a conventional steel plate S, and as shown in the drawing, the undulations of the steel plate itself remain as the undulations of the coating film surface. Therefore, since the light incident on the painted surface is reflected in multiple directions from the painted surface, the sharpness is reduced.
そこで、自動車その他のメーカー各社は塗料および塗装
法の改善によって、塗装鮮映性の向上を図っている。Therefore, automobile and other manufacturers are improving paint clarity by improving paints and coating methods.
（発明が解決しようとする問題点） 上記のように、塗料および塗装法の改善のみによっても
塗装鮮映性をある程度高めることはできるが、更に一層
の向上が望まれている。(Problems to be Solved by the Invention) As described above, although it is possible to enhance the clearness of the coating to some extent only by improving the coating material and the coating method, further improvement is desired.
第４図（ロ）は従来の鋼板Ｓの表面に塗布された潤滑油
Ｌの状態を示しており、場所によっては油膜が切れてい
る。したがって、油膜の切れた部分では摩擦が著しく大
きくなり、型のかじりおよび加工力の増大を招く。な
お、表面粗さが小さすぎると、鋼板表面に油膜が付着し
にくくなり、このことによっても型のかじりが発生す
る。FIG. 4B shows the state of the lubricating oil L applied to the surface of the conventional steel plate S, and the oil film is cut off at some places. Therefore, friction is remarkably increased at the cut portion of the oil film, which causes galling of the mold and an increase in processing force. If the surface roughness is too small, it becomes difficult for the oil film to adhere to the steel plate surface, which also causes galling of the mold.
そこで、この発明は塗装後の鮮映性の向上に寄与するよ
う鋼板表面を改善した高鮮映性鋼板を提供しようとする
ものである。Therefore, the present invention is intended to provide a high-visibility steel sheet having a steel sheet surface improved so as to contribute to the improvement of the sharpness after painting.
また、この発明では塗装鮮映性と同時にプレス性にも優
れた鋼鮮映性鋼板を提供しようとするものである。Further, the present invention is intended to provide a steel image-reflecting steel sheet which is excellent in coating image clarity and pressability at the same time.
（問題点を解決するための手段） この発明の高鮮映性鋼板は、放電ダル加工を表面に施し
た圧延ロールを用いて圧延した鋼板の表面にランダムな
凹凸を有するとともに、表面うねりがろ波中心線うねり
ＷCA（低減フィルタのカットオフ値 0.8mm）表示で 0.7
μｍ以下であることを特徴としている。上記表面うねり
の表示ＷCAはJIS B 0610に基づいている。(Means for Solving Problems) The high image clarity steel sheet of the present invention has random unevenness on the surface of a steel sheet rolled by using a rolling roll whose surface is subjected to electric discharge dull machining, and has a surface waviness. Wave center line waviness W CA (reduction filter cutoff value 0.8 mm) 0.7
It is characterized in that it is less than μm. The surface waviness indication W CA is based on JIS B 0610.
第１図に定性的に示すように、表面うねりと鮮映性との
間に相関性がある。なお、第１図の横軸は鋼板表面の３
次元プロフィル解析で得られた表面凹凸の波長および周
波数を示している。後に詳述するように表面うねりが
0.7μｍを超えると十分な鮮映性の向上が望めない。As qualitatively shown in FIG. 1, there is a correlation between the surface waviness and the sharpness. The horizontal axis of Fig. 1 is 3 of the steel plate surface.
The wavelength and frequency of the surface irregularities obtained by the dimensional profile analysis are shown. As described in detail later, surface waviness
If it exceeds 0.7 μm, sufficient improvement in image clarity cannot be expected.
また、上記鋼板において。表面粗さが中心線平均粗さＲ
ａ表示で 0.6μｍ以上、かつ 3.0μｍ以下であることが
望ましい。ここで、表面粗さの表示ＲａはJIS B 0601に
基づいている。Moreover, in the said steel plate. Surface roughness is centerline average roughness R
It is desirable that it is 0.6 μm or more and 3.0 μm or less in a display. Here, the indication R a of the surface roughness is based on JIS B 0601.
第２図に定性的に示すように、表面粗さとプレス性（型
かじりおよび表面摩擦）との間に相関性がある。表面粗
さＲａが 0.6μｍ未満あるいは 3.0μｍを超えると、プ
レス性が悪化する。As qualitatively shown in FIG. 2, there is a correlation between surface roughness and pressability (mold galling and surface friction). If the surface roughness Ra is less than 0.6 μm or exceeds 3.0 μm, the pressability deteriorates.
放電ダル加工によりロール表面に凹凸を形成した圧延ロ
ールにより、鋼板を軽圧下圧延することにより所要の表
面性状（表面うねりおよび表面粗さ）をもった高鮮映性
鋼板を得ることができる。なお、従来の鋼板圧延用の圧
延ロール表面に所要の凹凸を形成するには、放電加工あ
るいはショックブラストによっている。By using a rolling roll having irregularities formed on the roll surface by electric discharge dull processing, the steel plate is lightly rolled to obtain a high-visibility steel plate having required surface properties (surface waviness and surface roughness). Incidentally, in order to form the required unevenness on the surface of the conventional rolling roll for rolling a steel sheet, electric discharge machining or shock blasting is used.
（作用） この発明の高鮮映性鋼板は表面うねりが小さいために、
塗装後の表面も平滑となり、良好な鮮映性が得られる。
第３図（イ）はこの発明の網板Ｓの表面に塗膜Ｐを形成
したものを模式的に示しており、塗膜面は平滑となって
いる。(Operation) Since the high image clarity steel sheet of the present invention has a small surface waviness,
The surface after painting becomes smooth and good image clarity is obtained.
FIG. 3 (a) schematically shows a mesh plate S of the present invention having a coating film P formed on the surface thereof, and the coating film surface is smooth.
また、この発明の高鮮映性鋼板は表面粗さが小さいため
に、プレス加工の際に塗布した潤滑油が鋼板全面にわた
って均一な油膜を形成する。第４図（イ）はこの発明の
鋼板Ｓの表面に塗布された潤滑油Ｌを模式的に示してお
り、潤滑油Ｌは鋼板表面の凹凸の間に均一に保持されて
いる。Further, since the high image clarity steel sheet of the present invention has a small surface roughness, the lubricating oil applied during the press working forms a uniform oil film over the entire surface of the steel sheet. FIG. 4 (a) schematically shows the lubricating oil L applied to the surface of the steel plate S of the present invention, and the lubricating oil L is uniformly held between the irregularities on the surface of the steel plate.
（実施例） この発明の鋼板を得るために、圧延ロールを次のように
して準備した。まず、ロール表面を鏡面仕上したのち、
電極−ロール間ギャップおよび放電電流を精密に制御し
ながら放電ダル加工した。ついで、ロール表面を精密ク
ロムめっきした。(Example) In order to obtain the steel plate of this invention, the rolling roll was prepared as follows. First, after mirror finishing the roll surface,
Discharge dull machining was performed while precisely controlling the electrode-roll gap and the discharge current. Then, the roll surface was plated with precision chrome.
ロール表面の形状は、鋼板に転写する転写率0.4 〜0.6
とすると、ロール表面凹凸形状としての表面うねりがろ
波中心線うねりＷCA表示で 1.1μｍ以下（1.1 ×0.6 ≒
0.7μｍ）であり、さらに、表面粗さが中心線平均粗さ
Ｒａ表示で 1.0μｍ以上（1.0 ×0.6 ＝ 0.6μｍ）、か
つ 5.0μｍ以下（5.0 ×0.6 ＝ 3.0μｍ）である。The shape of the roll surface has a transfer rate of 0.4 to 0.6 that is transferred to the steel plate.
Then, the surface waviness as a roll surface unevenness is a filtered center line waviness W CA display is 1.1 μm or less (1.1 × 0.6 ≈
A 0.7 [mu] m), is more and 1.0μm or center line average roughness R a display surface roughness (1.0 × 0.6 = 0.6μm), and 5.0μm or less (5.0 × 0.6 = 3.0μm).
上記圧延ロールを用いて板厚0.7mm の自動車用鋼板（普
通鋼）を圧下率 1.0％で軽圧下圧延した。なお、比較の
ために、従来のダルロールによって上記と同一の鋼板を
同一の圧延条件で圧延した。そして、これら圧延によっ
て得られた鋼板について、以下に述べるように表面プロ
フィルの３次元解析を行い、鋼板表面性状（表面うねり
および表面粗さ）と鮮映性およびプレス性との関係につ
いて調査した。Using the above-mentioned rolling roll, a 0.7 mm-thick automobile steel plate (plain steel) was lightly rolled at a rolling reduction of 1.0%. For comparison, the same steel sheet as above was rolled by the conventional dull roll under the same rolling conditions. Then, with respect to the steel sheets obtained by these rollings, the three-dimensional analysis of the surface profile was performed as described below, and the relationship between the steel sheet surface properties (surface waviness and surface roughness) and the sharpness and pressability was investigated.
第５図はこの発明の鋼板Ａおよび従来の鋼板Ｂについて
表面うねりおよび表面粗さの測定結果を示している。表
面うねりおよび表面粗さは触針式表面粗さ計で測定し
た。この図面から明らかなように、両鋼板Ａ、Ｂにおい
て表面粗さＲａは重複する範囲があるが、この発明の鋼
板Ａの表面うねりＷCAは従来のものＢよりもかなり小さ
くなっている。FIG. 5 shows the measurement results of the surface waviness and the surface roughness of the steel plate A of the present invention and the conventional steel plate B. Surface waviness and surface roughness were measured with a stylus type surface roughness meter. As is apparent from this drawing, both steel A, but the surface roughness R a in B is overlapping ranges, it is considerably smaller than B that of the conventional surface waviness W CA of the steel plate A of the present invention.
第６図は上記鋼板の表面プロフィルの３次元解析の結果
を示すもので、波長のパワースペクトルを示している。
この図面から明らかなように、この発明の鋼板Ａは表面
うねりが従来の鋼板Ｂに比べて著しく小さくなってい
る。FIG. 6 shows the result of the three-dimensional analysis of the surface profile of the steel sheet, showing the power spectrum of the wavelength.
As is clear from this drawing, the surface waviness of the steel plate A of the present invention is significantly smaller than that of the conventional steel plate B.
第７図は上記鋼板の表面を塗装したものの波長のパワー
スペクトルを示している。この図面から明らかなよう
に、この発明の鋼板Ａの塗装表面の表面うねり従来の鋼
板Ｂに比べて著しく小さくなっている。FIG. 7 shows the power spectrum of the wavelength of the surface of the steel sheet coated. As is clear from this drawing, the surface waviness of the coated surface of the steel plate A of the present invention is significantly smaller than that of the conventional steel plate B.
第８図は第６図の結果を模式的に示したもので、一般的
に言ってこの発明の鋼板Ａの表面のプロフィルの波長
は、短い波長よりに幅広く分布している。これに対して
従来の鋼板Ｂの波長は、長い波長よりに集中的に分布し
ている。このことが鮮映性の向上に寄与している。FIG. 8 schematically shows the result of FIG. 6, and generally speaking, the wavelength of the profile of the surface of the steel sheet A of the present invention is broader than the short wavelength. On the other hand, the wavelength of the conventional steel plate B is more concentratedly distributed than the long wavelength. This contributes to the improvement of the image clarity.
第９図は表面うねりと鮮映性との関係を示したものであ
る。鮮映性は写像鮮映度計で測定したNSIC値で示してい
る。この図面から明らかなように、うねりが 0.7μｍよ
り大きくなると鮮映性が低下する。FIG. 9 shows the relationship between surface waviness and sharpness. The sharpness is shown by the NSIC value measured by the image clarity meter. As is clear from this drawing, when the waviness is larger than 0.7 μm, the sharpness is deteriorated.
第10図のグラフは、鋼板に２層塗装および３層塗装した
場合の鮮映性をこの発明の鋼板と従来のものとを比較し
て示している。グラフはNSIC値で表示しているが、目視
によっても鮮映性に大きな差異が認められた。The graph in FIG. 10 shows the image clarity when the steel sheet of the present invention is coated with two or three layers, comparing the steel sheet of the present invention with the conventional one. Although the graph is displayed with NSIC values, a large difference in visual clarity was also visually recognized.
第11図は表面粗さと型かじり性との間の関係を示すグラ
フである。表面粗さＲａが 0.6μｍ未満となると型かじ
り性が急激に悪化する。なお、表面粗さが 3.0μｍを超
えると、型かじり性が悪化するが、更に鋼板に 3.0μｍ
を超える表面粗さを与えるには圧延ロールに 5.0μｍ以
上の表面粗さを形成せねばならず、ロール表面加工が著
しく困難となり、経済的でない。FIG. 11 is a graph showing the relationship between surface roughness and mold gallability. If the surface roughness R a is less than 0.6 μm, the mold galling property is rapidly deteriorated. If the surface roughness exceeds 3.0 μm, the mold gallability deteriorates, but the steel plate has a further 3.0 μm.
In order to give a surface roughness of more than 5.0, the rolling roll must have a surface roughness of 5.0 μm or more, which makes the roll surface processing extremely difficult and is not economical.
また、プレス加工時（超硬材SRT 工具を用い、鋼板には
一般防錆油を塗布）の摩擦係数は、この発明の鋼板では
0.092 であり、従来の鋼板では0.11であった。In addition, the friction coefficient during press working (using a cemented carbide SRT tool and applying general rust preventive oil to the steel plate) is
It was 0.092 and 0.11 for the conventional steel sheet.
（発明の効果） この発明の鋼板は表面うねりを小さくしているので、従
来の鋼板に比べて高い鮮映性を示す。また、表面粗さを
一定の範囲に抑えることにより、良好なプレス性を得る
ことができる。(Effect of the Invention) Since the steel plate of the present invention has a small surface waviness, it exhibits higher image clarity than conventional steel plates. Further, by suppressing the surface roughness within a certain range, good pressability can be obtained.
第１図は表面うねりと鮮映性との関係を定性的に示すグ
ラフ、第２図は表面粗さとプレス性との関係を定性的に
示すグラフ、第３図は塗膜面の鮮映性の説明図、第４図
は鋼板表面の潤滑油の状態を示す模式図、第５図はこの
発明の鋼板および従来の鋼板について表面うねりおよび
表面粗さの測定結果を示すグラフ、第６図は鋼板表面凹
凸の波長のパワースペクトル図、第７図は塗装表面凹凸
の波長のパワースペクトル図、第８図は第７図の模式
図、第９図は表面うねりと鮮映性との関係を示すグラ
フ、第10図は鋼板に２層塗装および３層塗装した場合の
鮮映性をこの発明の鋼板と従来のものとを比較して示す
グラフ、および第11図は表面粗さと型かじり性との間の
関係を示すグラフである。Fig. 1 is a graph qualitatively showing the relationship between surface waviness and sharpness, Fig. 2 is a graph qualitatively showing the relationship between surface roughness and pressability, and Fig. 3 is the sharpness of coating film surface. FIG. 4 is a schematic diagram showing the state of lubricating oil on the surface of the steel sheet, FIG. 5 is a graph showing the measurement results of surface waviness and surface roughness for the steel sheet of the present invention and the conventional steel sheet, and FIG. 6 is Fig. 7 shows the power spectrum of the wavelength of the surface irregularities of the steel sheet, Fig. 7 shows the power spectrum of the wavelength of the surface irregularities of coating, Fig. 8 shows the schematic diagram of Fig. 7, and Fig. 9 shows the relationship between surface waviness and sharpness. A graph, FIG. 10 is a graph showing the sharpness of the steel sheet when two-layer coating and three-layer coating are compared between the steel sheet of the present invention and the conventional one, and FIG. 11 is the surface roughness and die-galling property. 3 is a graph showing the relationship between
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ６２Ｄ 29/00 Ｃ２１Ｄ 9/46 Ｅ // Ｂ０５Ｄ 5/06 １０４ Ｚ 8720−4Ｄ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI Technical display location B62D 29/00 C21D 9/46 E // B05D 5/06 104 Z 8720-4D
Claims (2)
もに、上記凹凸形状としては表面うねりがろ波中心線う
ねりＷCA（低域フィルタのカットオフ値0.8 mm）表示で
0.7μｍ以下であることを特徴とする高鮮映性鋼板。1. A surface of a steel sheet having random irregularities, and the irregularity is expressed by a surface waviness, a filter centerline waviness W CA (low-pass filter cutoff value 0.8 mm).
High image clarity steel plate characterized by being 0.7 μm or less.
μｍ以上、かつ 3.0μｍ以下である特許請求の範囲第１
項記載の高鮮映性鋼板。In 2. A surface roughness center line average roughness R a display 0.6
Claims 1 to 3 μm or more and 3.0 μm or less
High-definition image-forming steel sheet as described in the item.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62087922A JPH0623409B2 (en) | 1987-04-11 | 1987-04-11 | High image clarity steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62087922A JPH0623409B2 (en) | 1987-04-11 | 1987-04-11 | High image clarity steel plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63255320A JPS63255320A (en) | 1988-10-21 |
| JPH0623409B2 true JPH0623409B2 (en) | 1994-03-30 |
Family
ID=13928412
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62087922A Expired - Lifetime JPH0623409B2 (en) | 1987-04-11 | 1987-04-11 | High image clarity steel plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0623409B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04253503A (en) * | 1990-12-28 | 1992-09-09 | Nippon Steel Corp | Steel sheet for working having excellent painting brightness and production thereof |
| JPH04253502A (en) * | 1990-12-28 | 1992-09-09 | Nippon Steel Corp | Steel sheet having excellent painting brightness and production thereof |
| JP2696276B2 (en) * | 1991-02-27 | 1998-01-14 | 株式会社日立製作所 | Apparatus and method for polishing circular member, columnar or cylindrical member, and material to be rolled |
| BR112018010595B1 (en) | 2015-12-04 | 2023-04-18 | Arconic Technologies Llc | TEXTURE APPLICATION METHOD TO A METAL SHEET |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62230402A (en) * | 1986-03-31 | 1987-10-09 | Kawasaki Steel Corp | Steel sheet to be painted and its production |
| JPS63132728A (en) * | 1986-11-25 | 1988-06-04 | Sumitomo Metal Ind Ltd | Steel plate having high clear reflection excellent in workability |
-
1987
- 1987-04-11 JP JP62087922A patent/JPH0623409B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62230402A (en) * | 1986-03-31 | 1987-10-09 | Kawasaki Steel Corp | Steel sheet to be painted and its production |
| JPS63132728A (en) * | 1986-11-25 | 1988-06-04 | Sumitomo Metal Ind Ltd | Steel plate having high clear reflection excellent in workability |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63255320A (en) | 1988-10-21 |
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