JPH04333310A - Steel sheet for painting having excellent press formability - Google Patents
Steel sheet for painting having excellent press formabilityInfo
- Publication number
- JPH04333310A JPH04333310A JP3130227A JP13022791A JPH04333310A JP H04333310 A JPH04333310 A JP H04333310A JP 3130227 A JP3130227 A JP 3130227A JP 13022791 A JP13022791 A JP 13022791A JP H04333310 A JPH04333310 A JP H04333310A
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- roll
- painting
- steel plate
- resin
- 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 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000010422 painting Methods 0.000 title claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 17
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 19
- 229910052804 chromium Inorganic materials 0.000 abstract description 9
- 239000011651 chromium Substances 0.000 abstract description 9
- 239000010960 cold rolled steel Substances 0.000 abstract description 7
- 230000003746 surface roughness Effects 0.000 abstract description 7
- 230000001276 controlling effect Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 238000003491 array Methods 0.000 abstract 2
- 239000011347 resin Substances 0.000 description 23
- 229920005989 resin Polymers 0.000 description 23
- 238000012545 processing Methods 0.000 description 11
- 238000007747 plating Methods 0.000 description 9
- 238000000576 coating method Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 239000004925 Acrylic resin Substances 0.000 description 3
- 229920000178 Acrylic resin Polymers 0.000 description 3
- 239000010687 lubricating oil Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 2
- 238000005238 degreasing Methods 0.000 description 2
- 238000009713 electroplating Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000004070 electrodeposition Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 125000005397 methacrylic acid ester group Chemical group 0.000 description 1
- 239000000113 methacrylic resin Substances 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- 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
- Metal Rolling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Laser Beam Processing (AREA)
Abstract
Description
【0001】0001
【産業上の利用分野】本発明は、鋼板表面粗度パタ−ン
を規制することにより、プレス成形性を著しく向上させ
たプレス成形性に優れた塗装用鋼板に関するものである
。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated steel plate with excellent press formability, which has significantly improved press formability by controlling the surface roughness pattern of the 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。すな
わち、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、
かつ焼き付けを防止する作用をするからである。また、
プレス成形性に関する研究は、素材である鉄板側と、成
形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−ザ−等でダル加工し
たワ−クロ−ルを使用し、鋼板表面に粗さを転写してい
る。また、実際のプレス成形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
けでは不充分であり、鋼板表面粗度潤滑油等もプレス成
形性に大きな影響を及ぼす。例えば、ロ−ル表面粗度R
a,PPiを規制したダルロ−ルにて調質圧延すること
により、プレス成形性に優れた冷延鋼板の製造法が、特
公昭59−34441号公報に示しており、また、鋼板
の表面粗度のプロフィルを改良して、塗装後の塗膜表面
の凹凸を少なくし、水平部分の占める割合を多くするこ
とによって、光の正反射率の向上と写像の歪みを少なく
して、塗装後の鮮映性を従来よりも向上させ得る鋼板と
して、特開昭62−168602号公報が知られている
。2. Description of the Related Art Generally, the surface of a cold-rolled steel plate for processing is dull-finished to facilitate press working. In other words, during press working, lubricating oil for processing is stored in the unevenness formed on the surface of the steel plate, reducing friction between the die and the steel plate.
This is because it also acts to prevent burn-in. Also,
Research on press formability has been conducted from both the steel plate material side and the forming technology, but as products become more precise and complex, the properties required for steel plates are becoming more sophisticated.
It is becoming more diverse. For this reason, currently, in temper rolling, which finalizes the roughness of the steel sheet, a work roll that has been dulled by shot blasting, electric discharge, laser, etc. is used to roughen the surface of the steel sheet. The roughness is transferred to the surface. In addition, as evaluation criteria for actual press forming, the conventionally used mechanical properties of steel sheets (r value, El value, etc.) alone are insufficient, and steel sheet surface roughness, lubricating oil, etc. also have a large influence on press formability. effect. For example, roll surface roughness R
a. Japanese Patent Publication No. 59-34441 discloses a method for producing cold-rolled steel sheets with excellent press formability by temper rolling using dull rolls with controlled PPi. By improving the angle profile and reducing the unevenness of the surface of the paint film after painting, and increasing the proportion of the horizontal part, we are able to improve the specular reflectance of light and reduce distortion of the mapping. Japanese Patent Application Laid-open No. 168602/1983 is known as a steel plate that can improve image sharpness compared to conventional steel sheets.
【0003】0003
【発明が解決しようとする課題】これらの公知特許は、
プレス成形性ならびに塗装後の鮮映性を向上させるとい
う点では、優れたものではあるが、しかしながら、特公
昭59−34441号公報にあっては、鋼板表面粗度を
規制しなくてはならないという欠点があり、さらには、
任意に表面粗度Ra,PPiを有し、かつ冷延鋼板の製
造法に関しては、何等示唆を与えるものでない。また、
特開昭62−168602号公報にあっては、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を形成することによって、塗装
後の塗膜の鮮映性を向上させようとするものである。し
かし、溝状の谷部がリング状のパタ−ンである関係から
、プレス加工時鋼板表面に形成された凸部に加工用潤滑
油が貯留する量が少なく、プレス成形性が充分満足した
状態を得ることが出来ないという欠点がある。[Problem to be solved by the invention] These known patents are
Although it is excellent in terms of improving press formability and sharpness after painting, however, Japanese Patent Publication No. 59-34441 states that the surface roughness of the steel plate must be regulated. There are drawbacks, and even
It has arbitrary surface roughness Ra and PPi, and does not give any suggestion regarding the manufacturing method of cold rolled steel sheet. Also,
In JP-A No. 62-168602, the microscopic form constituting the surface roughness is such that it surrounds a trapezoidal peak having a flat peak surface and all or part of its periphery. By forming the groove-like troughs formed in the grooves, the sharpness of the coating film after painting is improved. However, because the groove-like troughs are in a ring-like pattern, the amount of processing lubricating oil that accumulates in the convex parts formed on the surface of the steel sheet during press forming is small, and the press formability is sufficiently satisfied. The disadvantage is that it is not possible to obtain
【0004】0004
【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、その特徴とするものは
、鋼板表面に微小かつ、多数の円、楕円及び多角形等の
形状を有する凹部を設けると共に、該凹部の形状は直径
d50〜200μm、凹部深さhが2〜16μm、凹部
容積は1×103〜1×106μmの範囲を満足し、圧
延方向に隣接する凹部間中心距離(p1)1.0d〜1
.5d、圧延方向列の列間中心距離(p2)0.1d〜
1.5dとしたことを特徴とするプレス成形性に優れた
塗装用鋼板にある。[Means for Solving the Problems] The present invention advantageously solves the problems of the prior art, and is characterized by having a large number of minute shapes such as circles, ellipses, polygons, etc. on the surface of a steel plate. In addition, the shape of the recess satisfies a diameter d50 to 200 μm, a recess depth h 2 to 16 μm, and a recess volume 1×10 3 to 1×10 6 μm, and the center between adjacent recesses in the rolling direction. Distance (p1) 1.0d~1
.. 5d, center distance between rows in rolling direction (p2) 0.1d~
A steel plate for painting with excellent press formability characterized by having a thickness of 1.5d.
【0005】以下、本発明を図面に従って詳細に説明す
る。図1は本発明によるロ−ル製造方法についての説明
図である。本発明は、先ず図1(A)に示すように、ロ
−ル1表面に約20〜30μmの樹脂2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ようにアルカ
リ系樹脂、及びメッキシ−ル用樹脂等が好ましく、例え
ば、アクリル樹脂、メタアクリル樹脂、メアクリル酸エ
ステル、ポリオレフィン樹脂、エポキシ系樹脂、アルキ
ッド樹脂、塩化ビニル樹脂、ポリアミド系樹脂等がある
。これら樹脂をロ−ル表面に約20〜30μmの樹脂を
被覆する。被覆の方法としては、ロ−ル非回転によるロ
−ル引き抜き法、電着塗装法、及びロ−ル回転によるロ
−ルコ−タ−、スプレ−による吹き付け、コ−テンコ−
タ−、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−ル表面に均一に付着させ乾燥させる。次いで
、図1(B)に示すように、樹脂を被覆したロ−ル1は
高密度エネルギ−、例えばレ−ザ−ビ−ム3により加工
を受ける。すなわち、レ−ザ−ビ−ム3を被覆した樹脂
2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凹部直径d10〜50μm
径、レ−ザ−照射条件、特にレ−ザ−出力、集光レンズ
4〜ロ−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50〜200μmの範
囲になるようにレ−ザ−照射条件を設定する。上記した
ロ−ル表面にレ−ザ−加工を行うには、樹脂被覆したロ
−ルを回転させながら、レ−ザ−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にもとずく加工周
波数、ロ−ル回転数にてレ−ザ−を照射して行う。レ−
ザ−加工後、図1(C)に示すように、本発明ロ−ルを
クロムメッキ溶液中でクロムメッキ5を行う。メッキ条
件はクロム酸溶液中で20〜50A/dm2の電流密度
、及び樹脂が溶解除去された後の凹部直径d10〜50
μmなる径、すなわち、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、前記によるレ−ザ−加工によ
って形成された穴径、5〜20μmの厚みで、先端形状
が丸、楕円形の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1(D)は、クロムメッキ後の
表面状態を示すもので、樹脂2及びロ−ル1表面によっ
て形成された穴6は、電解メッキされた曲面状のクロム
突起7が付着している。次いで、クロム突起7を有する
ロ−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1(D)に示す如く、樹脂を除去したロ−ル1
の表面には、クロム突起7が表出する。以上の工程によ
って、本発明はロ−ル1の表面に曲面状のクロム突起を
、所定のピッチで設けたロ−ルを製造することができる
。[0005] The present invention will be explained in detail below with reference to the drawings. FIG. 1 is an explanatory diagram of the roll manufacturing method according to the present invention. In the present invention, first, as shown in FIG. 1(A), the surface of a roll 1 is coated with a resin 2 having a thickness of about 20 to 30 μm. The coating resin has properties such as alkali resistance, chromic acid resistance, and insulation properties, and is preferably an alkaline resin or a plating sealing resin, etc., so that it can be easily removed in a subsequent process. For example, acrylic resin, Examples include methacrylic resin, methacrylic acid ester, polyolefin resin, epoxy resin, alkyd resin, vinyl chloride resin, and polyamide resin. These resins are coated on the roll surface to a thickness of about 20 to 30 μm. Coating methods include roll pull-out method using non-rotating rolls, electrodeposition coating method, roll coater using rotating rolls, spraying, and coating.
It is uniformly adhered to the roll surface by means such as coating with tar, powder coating, or wrapping a film-like resin, and then dried. Next, as shown in FIG. 1(B), the resin-coated roll 1 is processed by high-density energy, for example, a laser beam 3. That is, the laser beam 3 is irradiated from the surface of the coated resin 2 to melt and remove the resin in that area. Concave diameter d10~50μm after resin is dissolved and removed
It can be adjusted by adjusting the hole diameter, laser irradiation conditions, especially laser output, and the gap (focal shift) between the condenser lens 4 and the roll, and in the present invention, the hole diameter is in the range of 50 to 200 μm. Set the laser irradiation conditions so that To perform laser processing on the roll surface described above, the laser processing head is moved while rotating the resin-coated roll, and processing is performed based on a preset pitch interval P. This is done by irradiating laser at different frequencies and roll rotation speeds. Ray
After the laser processing, the roll of the present invention is subjected to chromium plating 5 in a chromium plating solution, as shown in FIG. 1(C). The plating conditions were a current density of 20 to 50 A/dm2 in a chromic acid solution, and a concave diameter of d10 to 50 after the resin was dissolved and removed.
The diameter of the hole is 5 to 20 μm, that is, the hole diameter is 5 to 20 μm, which is formed by the laser processing described above by performing electrolytic plating under conditions such as an input current of 2000 A to 20000 A depending on the effective area ratio of the chrome plated part. It is possible to attach chrome protrusions with round or oval tips. At this time, since the resin is an insulating material, chromium does not adhere to its surface, and depending on the plating conditions, only the hole is plated to a thickness that is approximately equal to or less than the thickness of the resin. . FIG. 1(D) shows the surface condition after chromium plating, in which holes 6 formed by the resin 2 and the surface of the roll 1 have electrolytically plated curved chrome protrusions 7 attached thereto. Next, the resin on the surface of the roll having the chrome protrusions 7 is removed by immersing it in a solvent or brushing it with a solvent. Then, as shown in FIG. 1(D), the resin is removed from the roll 1.
A chrome protrusion 7 is exposed on the surface. Through the above steps, the present invention can manufacture a roll in which curved chrome protrusions are provided on the surface of the roll 1 at a predetermined pitch.
【0006】図2(A)は本発明によるロ−ルの断面を
模式的に示したもので、ロ−ル1の表面にレ−ザ−を照
射して、直径50〜200μmの穴を形成する。7は、
穴6の上に付着したロ−ル表面より、直径D及び高さH
が5〜20μm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、圧延方向列の列間中心距離P
c=0.1D〜1.5D間隔で配設する。また、突起7
の高さHが20μmを超えると、圧延時に突起7がロ−
ル表面により脱落したり、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7の高さは、低い程良く
10μm以下程度が好ましい。しかし、2μm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出来ない。また、図2(
B)には、上記した表面形状を有するロ−ルにて調質圧
延し、40〜100%の割合で転写された鋼板の断面形
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
目的が達成出来ない。FIG. 2(A) schematically shows a cross section of a roll according to the present invention, in which the surface of the roll 1 is irradiated with a laser to form holes with a diameter of 50 to 200 μm. do. 7 is
Diameter D and height H from the roll surface attached to the hole 6
It is a protrusion mainly composed of chromium that protrudes so that the distance is in the range of 5 to 20 μm, and the center distance P between the rows in the rolling direction
They are arranged at intervals of c=0.1D to 1.5D. Also, protrusion 7
If the height H exceeds 20 μm, the protrusions 7 will be
The height of the protrusion 7 is preferably about 10 μm or less, because the height of the protrusion 7 is preferably as low as possible, since the protrusion 7 may fall off due to the surface of the protrusion or break due to the rolling load. However, if the thickness is less than 2 μm, the depth of the recesses transferred to the surface of the steel sheet will be low, and the roughness will also be low, making it impossible to achieve the object of the present invention. In addition, Figure 2 (
B) shows the cross-sectional shape of a steel plate that was temper-rolled with rolls having the above-mentioned surface shape and was transferred at a rate of 40 to 100%. Note that if the transfer rate is 40% or less, the depth of the recesses transferred to the surface of the steel plate will be low and the roughness will also be small, making it impossible to achieve the object of the present invention.
【0007】図3(A)(B)は、本発明による鋼板断
面及びロ−ル断面の平面を模式的に示したもので、鋼板
表面に、直径d50〜200μmの凹部を形成される。
圧延方向に隣接する凹部間中心距離P1=1.0d〜1
.5dと圧延方向列の列間中心距離P2=0.1d〜1
.5d間隔で配設する。このピッチをあまり大きくする
と、鋼板単位面積当りの油溜め量が減少するため、自動
車用鋼板等のプレス加工の厳しい部品、例えば、フロワ
−ボドセンタ−、ドアインナ−等では、プレス割れ問題
を招く。また、あまり小さくすると、ロ−ル加工時のレ
−ザ−パルスの能力(バラツキ範囲)上から本発明は上
記範囲に限定した。次に、鋼板凹部深さの上限は、前記
に示した突起の高さより16μmとし、鋼板凹部深さが
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出来ない。なお、鋼
板凹部形状は、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、鋼板凹部の平面形状から見
ると、円形、楕円形、長方形及び多角形を持ち、また、
同じく断面形状から見ると、円形、楕円形、長方形及び
多角形、台形、及び角状の物も考えられ、少なくとも前
記特開昭62−168602号公報の如き、溝状のリン
グ状谷部ではない凹部形状であればいかなる形状でもか
まわない。また、この点が第1の特徴でもある。FIGS. 3(A) and 3(B) schematically show planes of a steel sheet cross section and a roll cross section according to the present invention, in which a recessed portion with a diameter d50 to 200 μm is formed on the surface of the steel sheet. Center distance between adjacent recesses in the rolling direction P1=1.0d~1
.. 5d and the center distance between rows in the rolling direction P2 = 0.1d to 1
.. Arranged at 5d intervals. If this pitch is too large, the amount of oil reservoir per unit area of the steel plate will be reduced, which will lead to press cracking problems in parts that require severe press processing such as steel plates for automobiles, such as floor board centers, door inners, etc. Furthermore, if the diameter is too small, the present invention is limited to the above range in view of the ability (variation range) of laser pulses during roll processing. Next, the upper limit of the depth of the recess in the steel sheet is set to 16 μm from the height of the protrusion shown above, and when the depth of the recess in the steel sheet becomes lower than 2 μm, the depth of the recess on the surface of the steel sheet becomes low and the roughness becomes small. cannot be achieved. In addition, considering the oil reservoir effect during pressing and the lubrication effect on the surface of the steel plate, the shape of the recess in the steel plate has circular, elliptical, rectangular, and polygonal shapes when viewed from the planar shape of the recess in the steel plate.
Similarly, when viewed from the cross-sectional shape, circular, elliptical, rectangular, polygonal, trapezoidal, and angular shapes are also considered, and at least they are not groove-like ring-shaped valleys as in the above-mentioned Japanese Patent Application Laid-Open No. 62-168602. Any shape may be used as long as it is a concave shape. This point is also the first feature.
【0008】図4は本発明による冷間圧延鋼板の鋼板凹
部容積と穴ピッチの関係を示す図である。圧延方向に隣
接する凹部間中心距離P1=1.0d〜1.5dと圧延
方向列の列間中心距離P2=0.1d〜1.5dにおい
て、鋼板凹部容積は、1×103〜1×106μm3の
範囲がプレス性、及び鮮映性が最も優れている。鋼板凹
部容積が、1×103以下だと塗装鮮映性は向上するが
、プレス時の油溜め容積が低下し、プレス時の型かじり
を招く。また、鋼板凹部容積が、1×106μm3以上
の場合は、プレス時の油溜め容積の飛躍的な増加により
、プレス性は向上するが、鋼板上のうねりの増加により
、塗装鮮映性が、悪化するため、本発明においては、上
記範囲に限定した。すなわち、前記鋼板凹部形状を有し
、かつ、鋼板凹部容積が、1×103〜1×106μm
3の容積を持つことによって、鮮映性のあるプレス性鋼
板を得ることが出来る。すなわち、この点が第2の特徴
である。FIG. 4 is a diagram showing the relationship between the steel plate recess volume and hole pitch of the cold rolled steel plate according to the present invention. When the center distance between adjacent recesses in the rolling direction P1 = 1.0 d to 1.5 d and the center distance between rows in the rolling direction P2 = 0.1 d to 1.5 d, the steel plate recess volume is 1 x 10 3 to 1 x 10 6 μm 3 The range is the best in pressability and image clarity. When the volume of the recessed portion of the steel plate is 1×10 3 or less, the coating clarity improves, but the oil reservoir volume during pressing decreases, leading to mold galling during pressing. In addition, when the volume of the recess in the steel plate is 1 x 106 μm3 or more, the pressability improves due to a dramatic increase in the oil reservoir volume during pressing, but the paint sharpness deteriorates due to the increase in waviness on the steel plate. Therefore, in the present invention, it is limited to the above range. That is, the steel plate has the recess shape described above, and the volume of the steel plate recess is 1×10 3 to 1×10 6 μm.
By having a volume of 3, it is possible to obtain a pressable steel plate with good image clarity. That is, this point is the second feature.
【0009】[0009]
【実施例】直径600mmφの5%Cr鍛鋼調質圧延ロ
−ル用ワ−クロ−ルの表面に、アクリル樹脂をロ−ラ−
塗布にて厚さ20μm〜30μmに均一に塗布した後乾
燥した。その後、該樹脂を被覆したロ−ル表面に8〜2
0Wパワ−のYAGパルスレ−ザ−を照射し、円形凹部
を形成した。すなわち、一定のピ−ク値をパルス幅を有
するパルスレ−ザ−光を集光レンズで焦点距離を変え、
円形凹部の穴直径d50〜200μm、かつ隣接する凹
部間中心距離が直径dの1.0d〜1.5dとなるよう
に、ロ−ルを回転し、レ−ザ−ヘッドを移動させながら
、ロ−ル表面に照射し、被覆した樹脂を貫通し、かつロ
−ル表面をわずかに溶かして円形凹部を形成する。レ−
ザ−加工後、ロ−ルをアルカリ電解温度45〜50℃、
脱脂時間100〜150secで脱脂し、クロム酸溶液
でクロムメッキを行った。すなわち、クロム酸溶液中で
電解メッキをし、ほぼ8μm厚さのクロムをロ−ル表面
に形成した穴部に密着させた。この際ロ−ル表面を被覆
したアクリル樹脂は絶縁性を有することから、樹脂被覆
された面はクロムメッキはなく、穴部に樹脂の厚みとほ
ぼ同一の厚みにクロムメッキがされた。メッキ後は表面
被覆している樹脂を溶剤でブラッシングして除去した。
その結果、ロ−ル表面には、ほぼ8μmのクロム突起が
正方配列していた。このようにして製造した圧延ロ−ル
を用いて、0.75mm厚さの冷延鋼板に伸び率1.2
%の調質圧延を行い、ロ−ル表面に形成した粗面を鋼板
に転写され、その際の鋼板形状パタ−ンを表1に示す。
この表1に示す各鋼板の形状パタ−ンについて限界絞り
比(L、D、R)にて評価した。このL、D、Rはポン
チ径32mmの金型を用いて深絞りしうる最大素板径D
を求め、ポンチ径dとの比から求めた。すなわち、L、
D、R=Dmax/d、その結果について、プレス加工
性、ロ−ル寿命と共に表2に示す。[Example] Acrylic resin was applied to the surface of a work roll for a 5% Cr forged steel temper rolling roll with a diameter of 600 mmφ.
It was coated uniformly to a thickness of 20 μm to 30 μm and then dried. After that, 8 to 2
A YAG pulse laser with 0 W power was irradiated to form a circular recess. That is, by changing the focal length of pulsed laser light with a constant peak value and pulse width using a condensing lens,
While rotating the roll and moving the laser head, the roller - Irradiate the roll surface, penetrate the coated resin, and slightly melt the roll surface to form a circular recess. Ray
After the laser processing, the roll is subjected to alkaline electrolysis at a temperature of 45 to 50℃.
Degreasing was performed for a degreasing time of 100 to 150 seconds, and chromium plating was performed using a chromic acid solution. That is, electrolytic plating was performed in a chromic acid solution to adhere chromium approximately 8 μm thick to the holes formed on the roll surface. At this time, since the acrylic resin that coated the roll surface had insulating properties, the resin-coated surface was not plated with chrome, but the holes were plated with chrome to a thickness that was approximately the same as the thickness of the resin. After plating, the resin covering the surface was removed by brushing with a solvent. As a result, chrome projections of approximately 8 μm were squarely arranged on the roll surface. Using the rolling roll manufactured in this way, a cold rolled steel plate with a thickness of 0.75 mm was coated with an elongation rate of 1.2.
% temper rolling was performed, and the rough surface formed on the roll surface was transferred to the steel plate. Table 1 shows the steel plate shape pattern at that time. The shape patterns of each steel plate shown in Table 1 were evaluated using the limit drawing ratios (L, D, R). These L, D, and R are the maximum blank diameter D that can be deep drawn using a die with a punch diameter of 32 mm.
was determined from the ratio to the punch diameter d. That is, L,
D, R=Dmax/d, and the results are shown in Table 2 along with press workability and roll life.
【0010】0010
【表1】[Table 1]
【0011】[0011]
【表2】
表2から明らかなように、本発明による試料1〜5は従
来の6〜8に比べて、特にプレス性鋼板及びロ−ル寿命
に極めて優れていることがわかる。[Table 2] As is clear from Table 2, it can be seen that Samples 1 to 5 according to the present invention are extremely superior to conventional samples 6 to 8, especially in terms of pressability steel sheets and roll life.
【0012】0012
【発明の効果】本発明によって、従来のレ−ザ−鋼板に
比較し、プレス性に優れた塗装用冷延鋼板が可能となる
とともに、クロム突起形状の制御により、ロ−ル寿命の
飛躍的向上を図ることができる。[Effects of the Invention] The present invention makes it possible to produce cold-rolled steel sheets for painting that have superior pressability compared to conventional laser steel sheets, and by controlling the shape of chrome protrusions, roll life can be dramatically extended. You can improve your performance.
【図1】本発明によるロ−ル製造方法の1例を示す図、
FIG. 1 is a diagram showing an example of the roll manufacturing method according to the present invention,
【図2】本発明ロ−ル及び本発明ロ−ルを用いて圧延し
た鋼板の1部断面図、FIG. 2 is a partial sectional view of the roll of the present invention and a steel plate rolled using the roll of the present invention;
【図3】本発明ロ−ル及び本発明ロ−ルを用いて圧延し
た鋼板の1部平面図、FIG. 3 is a partial plan view of the roll of the present invention and a steel plate rolled using the roll of the present invention;
【図4】本発明鋼板の鋼板凹部容積と穴ピッチの関係を
示す図である。FIG. 4 is a diagram showing the relationship between the steel plate recess volume and hole pitch of the steel plate of the present invention.
1 ロ−ル、 2 樹脂、 3 レ−ザ−ビ−ム、 4 集光レンズ、 5 クロムメッキ、 6 穴、 7 突起。 1 roll, 2 Resin, 3 Laser beam, 4 Condensing lens, 5 Chrome plating, 6 holes, 7.Protrusion.
Claims (1)
及び多角形等の形状を有する凹部を設けると共に、該凹
部の形状は直径d50〜200μm、凹部深さhが2〜
16μm、凹部容積は1×103〜1×106μmの範
囲を満足し、圧延方向に隣接する凹部間中心距離(p1
)1.0d〜1.5d、圧延方向列の列間中心距離(p
2)0.1d〜1.5dとしたことを特徴とするプレス
成形性に優れた塗装用鋼板。[Claim 1] A steel plate surface is provided with a large number of minute recesses having shapes such as circles, ellipses, polygons, etc., and the shape of the recesses is such that the diameter d is 50 to 200 μm and the recess depth h is 2 to 200 μm.
16 μm, the recess volume satisfies the range of 1×103 to 1×106 μm, and the center distance between adjacent recesses in the rolling direction (p1
) 1.0d to 1.5d, center distance between rows in rolling direction (p
2) A steel plate for painting with excellent press formability, characterized by having a thickness of 0.1 d to 1.5 d.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3130227A JPH04333310A (en) | 1991-05-07 | 1991-05-07 | Steel sheet for painting having excellent press formability |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3130227A JPH04333310A (en) | 1991-05-07 | 1991-05-07 | Steel sheet for painting having excellent press formability |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH04333310A true JPH04333310A (en) | 1992-11-20 |
Family
ID=15029139
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3130227A Pending JPH04333310A (en) | 1991-05-07 | 1991-05-07 | Steel sheet for painting having excellent press formability |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH04333310A (en) |
Citations (1)
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 |
-
1991
- 1991-05-07 JP JP3130227A patent/JPH04333310A/en active Pending
Patent Citations (1)
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 |
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