JPH0775804A - Metallic sheet for non-coating - Google Patents

Abstract

PURPOSE:To provide a metallic sheet for non-coating such as a stainless steel sheet excellent in antidazzle characteristics and feeling of color tone. CONSTITUTION:In the metallic sheet for non-coating on the surface of which micro concave parts are formed, the depth of the concave part is taken as the range of 5-30mum and its surface shape is composed of the micro surface element whose three-dimensional inclined angle is <=+ or -2 deg. and <=25% of the total micro surface element and the micro surface element whose three- dimensional inclined angle is 20 + or -2 deg. is 0.4-1.6% of the total micro surface element. The three-dimensional inclined angle is an angle which is formed by a normal vector N of a regression plane SK which is defined by the data of ruggedness (H(In, Jn), H(In+2, Jn), H(In+2, Jn+2), H (In, Jn+2)) which are measured at hour measuring points (D(In, Jn), D(In+2, Jn), D(In+2, Jn+2), D(In, Jn+2)) by which a micro-scopic surface element Se is defined and the normal vector of the microscopic surface element Se.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-painted metal plate, particularly an unpainted product excellent in antiglare property and color tone, which is usually used as an exterior material for buildings, vehicles, etc. without being painted. For metal plate for use.

[0002]

2. Description of the Related Art Generally, as a surface material (exterior material) for building exteriors, a metal material such as an aluminum plate or a stainless steel plate having a high rust preventive ability is used without coating.

An exterior material for a building made of such a metal plate has an antiglare property that reduces glare under the sky while maintaining a constant brightness, and at the same time, the exterior surface of the building from a shallow angle. It is required that the light reflection from the surface is weak when seen. In particular, when a metal plate is used as a roofing material, when the roof is viewed from the ground, the more light reflection is weak in the viewing direction, the more excellent the color tone is obtained.

Since the light reflection state (antiglare property, color tone) on the surface of a metal such as a steel plate is determined by the fine irregularities provided on the surface, the fine shape (fine irregularities) formed on the surface. (Shape) is very important.

As described above, in order to provide the surface of the metal plate with the antiglare property under the sky while maintaining a constant brightness, conventionally, the flat portion and the recessed portion on the surface are appropriate. The metal plate is hairline-processed and dull-finished so that the ratio becomes proportional.

For this dulling finish, for example, in the case of a steel plate, a work roll whose surface is dulled by shot blasting, electric discharge, laser irradiation or the like is used when temper rolling is performed to finally adjust the roughness. It is used by transferring the roughness (fine irregularities) formed on the surface of the steel sheet to the surface of the steel sheet.

Further, as a method for imparting a special uneven shape to the surface and a technique relating to a steel sheet having the shape, for example, a steel sheet for automobiles or home appliances is provided with a regular uneven shape on the surface. A method for producing a steel sheet with high paint clarity is disclosed in many publications such as JP-A-4-253503, 4-253502, and 4-333309.

[0008]

However, although the techniques disclosed in the above publications are excellent in that they improve the image clarity after coating, some of these techniques have high antiglare properties. It is not possible to manufacture steel plates with a surface.

It is known that the anti-glare property is more effective as the surface unevenness is larger and the flat area is smaller, but it is generally used in the shot blasted roll. On the surface of the rolled steel plate or the like, there is a problem that the scattering of light is very large and the entire surface becomes dark.

Further, although the above-mentioned hairline finish can impart antiglare property to the surface, it has a problem that a good color tone cannot be obtained depending on the viewing direction because the directionality of the color tone appears.

The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a non-painting metal plate excellent in antiglare property and color tone.

[0012]

According to the present invention, in a non-painting metal plate having minute recesses formed on its surface, 25% of all the minute surface elements are within a range of ± 2 ° at a three-dimensional tilt angle. The above-mentioned problem is solved by setting microscopic surface elements having a three-dimensional inclination angle of 20 ° ± 2 ° as 0.4% to 1.6% of all the microscopic surface elements below.

According to the present invention, in the above-mentioned non-painting metal plate, the depth of the recess is in the range of 5 μm to 30 μm.

[0014]

As a result of various studies by the present inventors, the three-dimensional tilt angle is ± 2 ° when the minute recesses are formed on the surface of the metal plate.
25% or less of all the micro-planes in the range of, and the micro-planes of 20 ° ± 2 ° at the same inclination angle are 0.4% to 1.6% of all the micro-planes. It was found that a metal plate having excellent antiglare property and color tone can be obtained.

Here, the three-dimensional inclination angle is obtained by calculating, for example, by the method of least squares from the data in a predetermined area about the two-dimensional cross-sectional profile measured by using a measuring device such as a roughness meter. The direction of the normal vector obtained for the regression plane is the angle formed with the normal vector of the measurement reference plane. In addition, the minute surface element means a predetermined area serving as a reference for calculating a regression plane for obtaining the normal vector.

FIG. 1 conceptually shows the regression plane, measurement reference plane, micro-plane element and normal vector.
It will be specifically described with reference to.

For a measurement data surface S _O corresponding to the actual metal plate surface (original surface), a measurement reference plane consisting of an XY plane which serves as a reference when measuring the unevenness data of the surface is set. When setting the area of this measurement reference plane, the surface of the metal plate is a random rough surface, or has a regular pattern as shown in the examples described later, and the measurement area is a repetition of the regular pattern. In the case of a sufficiently large area that is about 10 times larger than the pitch, the measured data surface S
The strictness of the setting for _O is not required. However, when the regular pattern is large and is several times as large as the area of the measurement reference plane, the area of the measurement reference plane needs to be set strictly, and the origin of the regular pattern is set as the measurement start point. In the implementation, a method of cutting out the origin of the regular pattern from the data and analyzing it from the measurement result is adopted.

On the measurement reference plane, the measurement points {D (I
_n , J _n ) ...} is determined, surface unevenness data at each measurement point is actually measured, and the measured data {H (I _n , J _n ) ・
・ ・} Is requested. Here, D represents the coordinates defined by the pitch P, and H represents the height.

The micro-plane element Se is set on the XY plane having the measurement pitch P or more. That is, the minute surface element Se is included in the measurement reference plane. In this example, the small surface element Se
Is D (I _n , J _n ), D (I _{n + 2} , J _n ), D (I
_{n + 2} , J _{n + 2} ) and D (I _n , J _{n + 2} ) are defined by four measurement points, and one side is set as a 2P square.

Regression plane S for the micro-plane element Se_K
Are measured at the above-mentioned four measurement points that define the micro-plane element Se.
Constant data {H (I_n, J_n), H (I_{n + 2}, J_n), H
(I _{n + 2}, J_{n + 2}), H (I_n, J_{n + 2})}
Is the plane indicated by the broken line in the figure, and
The normal vector is N.

Therefore, the three-dimensional tilt angle in the micro surface element Se is an angle formed by the normal vector N and the measurement reference plane, that is, the normal vector (not shown) in the micro surface element Se.

Next, a method of analyzing the surface which gives the antiglare property and the color tone will be described. As this surface analysis method,
The method already proposed by the applicant in Japanese Patent Application No. 5-28704 can be used.

This surface analysis method will be described with reference to FIG. 1 as a concrete example.
2D position data defined by a constant measurement pitch P on the plane) and the unevenness shape data measured at the measurement pitch P, a predetermined area equal to or larger than the measurement pitch P is set as a minute surface element Se
And calculates the normal vector N of the regression plane S _K defined by the measured concavo-convex shape data corresponding to the four vertices of the minute surface element Se, and at the same time, this predetermined area (minute pixel) is set to the measurement pitch P or more. While shifting at the moving pitch, the same calculation is performed for the entire region (entire surface) to calculate the normal vector corresponding to the micro-plane element Se almost continuously, and the predetermined normal vector is calculated from the distribution of the obtained normal vectors. This is a method of calculating an integrated intensity (the number of corresponding minute surface elements) falling within the tilt angle range and determining a color tone from the integrated intensity.

The integrated intensity calculated by this method has a good correlation with the specular glossiness, which is one of the indicators of the color tone, and the correlation well agrees with the visual evaluation of the color tone by the inspector. Has been confirmed.

At this time, the width of the minute surface element Se, that is, the length of one side is preferably 10 μm or less in consideration of the linearity of the analysis result (reflection vector integrated intensity) as shown in FIG. 2, for example. However, it is not limited to this. The reflection vector is synonymous with the normal vector.

In the present invention, the recesses formed on the surface of the metal plate may have a minute shape such as a large number of regularly controllable circles, ellipses or polygons.

The reason why the substantially flat micro-planes with a three-dimensional tilt angle of ± 2 ° or less is 25% or less of all the micro-planes is that if it exceeds 25%, the reflection is too large and the antiglare property is high. Because it will be insufficient.

Further, the reason why the fine surface elements having a three-dimensional tilt angle of 20 ° ± 2 ° are 0.4% to 1.6% of all the fine surface elements is as follows.
As a result of a detailed study, the three-dimensional tilt angle in the range of 20 ° ± 2 has the most correlation with the visual color tone, and the antiglare property is less than 0.4% of the total amount of the minute surface elements in this angle range. This is because, in addition to being insufficient, the color tone is poor, and even if the amount exceeds 1.6%, the color tone is also poor. The inclination angle of 20 ° is a plane including minute surface elements (XY in FIG. 1).
It is the absolute value of the inclination angle with respect to the plane) and means ± 20 °.

In the present invention, the depth of the recess is 5 μm.
When the thickness is in the range of -30 μm, a metal plate having both excellent antiglare property and color tone can be easily and surely obtained.

In this way, the depth of the recess is 5 μm to 30 μm.
The reason why m is set is that if it is less than 5 μm, the antiglare property is insufficient, and if it exceeds 30 μm, the etching process on the surface of the rolling roll is severe, so that neither is preferable. However, the processing is not limited to 30 μm or less as long as the processing can exceed 30 μm.

[0031]

Embodiments of the present invention will now be described in detail with reference to the drawings.

As the non-painting metal plate of this embodiment, for example, a metal plate having regular fine recesses formed on its surface as shown in FIG. 3 can be mentioned. The surface shape data shown in FIG. 3 corresponds to a size of 1.5 mm long and 2.0 mm wide.

The non-painting metal plate can be manufactured by rolling a steel plate. First, dull processing of the roll surface, which is a roll surface processing technique for forming an arbitrary fine uneven shape on the metal surface of the work roll used for this rolling, will be described. Regarding the dull processing, a method of using a laser marking technique and an etching technique in combination has already been proposed by the present applicant in Japanese Patent Laid-Open No. 2-175882.

An example of this dulling technique will be briefly described. An acid-resistant resin mixed with a light absorbing agent is applied to the roll surface to form a thin film, and the condensing diameter is 50 μm with respect to the resin thin film.
The resin coated on the roll surface is partially removed by irradiating the YAG laser focused to the following. Thereafter, the surface of the work roll is dipped in a corrosive liquid (etching liquid), and the roll surface is etched to form irregularities on the surface.

When this surface processing technique is used, for example, by setting the resolution of the laser beam in the roll rotation direction and the axial direction to about 30 μm, an arbitrary convex portion formed by combining dots with a minimum unit of 30 μm square is formed on the roll surface. It is possible.

The slope of the convex portion formed on the roll surface is controlled by adjusting the rotation speed of the roll, the concentration of the etching solution, the etching time, etc. when the roll surface is etched. It is possible.

By rolling a metal plate with a roll having fine projections formed on the surface by this method, flat portions and depressions can be formed on the surface, and the flat shape, size, and arrangement of the depressions can be improved. A flexible metal plate surface can be easily created.

By using the work roll prepared by the roll surface processing technique capable of arbitrarily forming the surface irregularities as described above, the present inventors have detailed the surface shape giving good antiglare property and color tone. investigated.

At that time, for the surface analysis, the above-mentioned Japanese Patent Application No. 5-28 is used.
The surface analysis method proposed in 704 was used. In the actual surface analysis, the measurement pitch P shown in FIG. 1 was set to 2 μm.
, Micro-plane element Se 4μm x 4μm, moving pitch 2μm
While shifting the minute pixel Se by this movement pitch, the normal vector N is calculated substantially continuously over the entire region (entire surface), and the integrated intensity falling within a predetermined three-dimensional tilt angle range from the obtained normal vector distribution ( The number of corresponding micro surface elements) was calculated, and the color tone was judged from the integrated intensity.

In this embodiment, a surface pattern of a stainless steel plate having a different integrated strength is designed, and a rolling roll for forming the designed surface pattern by rolling is manufactured by using the roll processing method, and the rolling roll is manufactured. A stainless steel plate having a predetermined surface shape was manufactured by rolling using. Then, the surface of the steel sheet was analyzed by the surface analysis method, and the manufactured steel sheet was visually evaluated for its color tone feeling by a plurality of skilled inspectors. As a result, they succeeded in finding an uneven shape having a surface excellent in antiglare property and excellent in color tone.

Next, a more specific example will be described.

Austenitic stainless steel plate SUS3
04 is used as a mother board, and the surface has a depth of 10 μm to 15 μm.
As shown in Table 1 below, the ratio of the integrated intensity of the normal vector distribution having the unevenness of μm and the three-dimensional tilt angle of 20 ° ± 2 ° (the above-mentioned three-dimensional tilt angle range for all micro surface elements) Was produced by the method disclosed in the above-mentioned JP-A-2-175882, and was rolled at a rolling reduction of 5% by a Sendzimir mill to which the rolling roll was applied.

With respect to the steel sheet obtained by rolling in this way, the measurement pitch P, the micro-plane element Se and the moving pitch are set to 2 μm, 4 μm × 4 μm and 2 μm, respectively, as described above, and the normal vector is set by the above method. N was calculated, the ratio of the integrated intensity based on the normal vector distribution was calculated, and the calculation result was compared with the evaluation by visual inspection.
Table 2 below shows the results of comparison between the obtained integrated intensity and the color tone evaluation by visual inspection.

In this color tone evaluation, the integrated intensity of the normal vector distribution is set to an angle range of 20 ° ± 2 °, but this angle range is determined in advance as the angle having the best correlation with the visual inspection of the inspector. It was decided by. In the table, ⊚ indicates good, ○ indicates slightly good, and × indicates poor.

[0045]

[Table 1]

[0046]

[Table 2]

From Table 2 above, even if the ratio is about 0.2%,
It can be seen that the color tone is insufficient even at about 2%.

Next, the range of the integrated intensity in the above angle range (20 ° ± 2 °) is set to about 0.8% with a good color tone, the inclined area of the unevenness is changed, and the area ratio of the flat portion is changed. The antiglare property was evaluated on the surface of the steel sheet rolled by the rolling rolls. The design area ratio of the flat portion of the used rolling roll is shown in Table 3 above, and the integrated intensity ratio of the normal vector distribution in the range of ± 2 ° obtained on the surface of the steel sheet after rolling with these rolling rolls and the antiglare property The relationships are shown in Table 4 below.

[0049]

[Table 3]

[0050]

[Table 4]

From Table 4 above, it can be seen that the higher the ratio, the worse the antiglare property, and 31% is insufficient.

From the results of Tables 2 and 4, the integrated intensity ratio of the normal vector distribution of ± 2 ° is 25% or less, and
The integrated intensity ratio of the normal vector distribution of 20 ° ± 2 ° is 0.
It can be seen that the surface having a ratio of 4% to 1.6% has excellent antiglare property and color tone.

According to this embodiment described in detail above, the non-painting steel sheet obtained by rolling has excellent antiglare properties,
And it becomes possible to form a surface with excellent color tone,
As a result, it becomes possible to create an environment with a high degree of design that has never existed before.

Further, according to the present embodiment, when designing a building or the like, the designer can freely select a surface having excellent anti-glare property and color tone. It is possible to contribute to the creation of new ideas by persons.

Although the present invention has been specifically described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in the above embodiment, the case where the processing method disclosed in the above-mentioned Japanese Patent Laid-Open No. 2-175882 is applied to the surface processing of the rolling roll is shown, but the present invention is not limited to this and is generally used. The surface of the roll may be dulled by the photo-etching method.

The metal plate is not limited to the stainless steel plate, but may be an aluminum plate, for example, and the recesses formed on the metal surface are not necessarily regular.

[0058]

As described above, according to the present invention,
It is possible to provide a non-painting metal plate having excellent antiglare properties and excellent color tone.

[Brief description of drawings]

FIG. 1 is a conceptual diagram for explaining the principle of a surface analysis method.

FIG. 2 is a diagram showing a relationship between a side length of a minute surface element and a reflection vector.

FIG. 3 is an explanatory view showing a three-dimensional shape of a dull finish surface of a steel plate which is an embodiment of the present invention.

[Explanation of symbols]

Se ... Small surface element S _O ... Measurement data surface S _K ... Regression plane N ... Normal vector P ... Measurement pitch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Torao 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture Technical Research Division, Kawasaki Steel Co., Ltd. (72) Inventor Kazuo Onda 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Corporation Technical Research Division

Claims (2)

[Claims] 1. In a non-painting metal plate having minute recesses formed on the surface, the number of micro-plane elements within a three-dimensional tilt angle of ± 2 ° is 25% or less of all the micro-plane elements, and the three-dimensional tilt. A non-painting metal plate, characterized in that the microscopic surface area of 20 ° ± 2 ° is 0.4% to 1.6% of all the microscopic surface elements. 2. The non-painting metal plate according to claim 1, wherein the depth of the recess is in the range of 5 μm to 30 μm.