JPH0985306A - Manufacture of dull finished stainless steel sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a dull finished stainless steel sheet excellent in antidazzle characteristic and uniformity of color tone by rolling a stainless sheet using work rolls on which random pattern without directivity is applied and only the surfaces of projecting parts of the pattern is dull worked. SOLUTION: First, the random pattern without dirctivity is formed on the surface of the work rolls by photoetching method. Next, the surface is roughened by applying dull working only to the projecting part 2 of the random pattern of the work roll, for example, by electric discharge machining. And, its mean surfaceroughness is ranged in 2-15μm and the depth of the recessed part 1 of the pattern provided on the surface by an etching method is ranged in 20-200μm. Because the ruggedness by etching is imparted to the dullfinished stainless steel sheet which is manufactured using such work rolls, antidazzle characteristic is greatly improved and, because the ruggedness by etching are enough deep, the change in the projecting and recessing shape and the change in the color tone which are transferred on the surface of sheet are small even when roll wear progresses to some extent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a dull-finished stainless steel sheet, which is mainly used for interiors and exteriors of buildings and is particularly excellent in antiglare property and color tone uniformity.

[0002]

2. Description of the Related Art Recently, stainless steel plates have been widely used as building materials for interiors and exteriors of buildings. The reason is,
This is because the corrosion resistance and beauty of stainless steel have been utilized for building materials. However, when it is used as an exterior material, it often causes a problem from the viewpoint of antiglare property because of the beautiful texture of the stainless steel sheet. As one of the methods for satisfying this antiglare property, it is effective to use a dull finish stainless steel plate. The dull-finished stainless steel plate is generally manufactured by rolling using a work roll that has been satinized (dulled) by shot blasting or electric discharge machining, as disclosed in, for example, Japanese Patent Laid-Open No. 4-46612. Is the way.

The dull-finished stainless steel plate manufactured by the above-mentioned method has the following problems. (1) The antiglare property is not always sufficient under direct sunlight. (2) Since the work roll dull surface roughness decreases due to wear as the rolling distance increases, the surface roughness of the stainless steel plate also changes to a finer surface, and the surface color tone changes accordingly. Is insufficient.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a dull-finished stainless steel sheet excellent in antiglare property and color tone uniformity.

[0005]

The above objects and advantages of the present invention are as follows. First, a random pattern having no directionality is applied to the surface by an etching method, and only the convex surface of the pattern is dulled. This is achieved by a method for producing a dull-finished stainless steel plate, which comprises rolling the stainless steel plate using a work roll that is used. Hereinafter, this invention will be referred to as a first invention.

Further objects and advantages of the present invention are as follows:
Work roll (I) having a dull surface
The present inventor also achieves a method for producing a dull-finished stainless steel sheet, which is characterized by combining rolling with a work roll (II) having a random pattern with no directionality on the surface by etching and rolling. Revealed by others. This manufacturing method is referred to as a second invention.

The present invention will be described in detail below, by which other objects, advantages and effects of the present invention will be apparent.

First, the first invention will be described. A random pattern having no directivity (hereinafter, also simply referred to as “random pattern”) can be formed on the surface of the work roll by an etching method by a method known per se. For example, a random pattern can be formed by a photo etching method.

With respect to the size of the random pattern, when a closed curve is drawn on each of the convex portions so as to include one convex portion, the average diameter of an equivalent circle having an area formed by the closed curve is applied to the convex portion to be described later. It is preferably 10 to 100 times, more preferably 20 to 80 times, the value of the surface average roughness Ra dull-processed by the electric discharge machining method.

Further, from the viewpoint of maintaining the color tone of the dull-finished stainless steel sheet as uniform as possible even if the rolling distance increases, the depth of the recesses of the random pattern is preferably 20 to 200 μm, more preferably 50 to 150 μm. Here, the depth of the concave portion of the random pattern is defined as the difference between the roughness center line of the convex portion and the roughness center line of the concave portion, and is a value measured by a depth gauge or a surface roughness meter.

In the first aspect of the invention, only the convex portions of the random pattern are subjected to dull processing by, for example, electric discharge machining to roughen the surface. The surface average roughness Ra is preferably 2 μm or more from the viewpoint of imparting excellent antiglare properties. However, even if Ra exceeds 15 μm, the effect is saturated. The dull effect by the electric discharge machining method is known per se, and it is easy for a person skilled in the art to give the average roughness Ra as described above to the convex portions of the random pattern.

FIG. 1 shows a schematic cross-sectional view of the work roll used in the first invention and the dull-finished stainless steel plate produced in the first invention. FIG. 1 shows a state where a dull-processed convex portion 2 of the work roll is transferred as a concave portion 4 on the surface of the stainless steel plate, and a concave portion 1 of the work roll is transferred as a convex portion 3 of the stainless steel plate. ing.

Next, the second invention will be described. Second
The surface of the work roll (I) used in the invention is subjected to a usual dull process. Average roughness Ra of the surface
Is preferably 2 μm or more from the viewpoint of imparting sufficient antiglare property to the stainless steel plate. However, even if it exceeds 15 μm, the effect is saturated. As described above, the dull processing on the surface of the work roll (I) can be performed by a method known per se, for example, a shot blast processing method or an electric discharge processing method.

The surface of the work roll (II) is provided with a random pattern having no directivity (random pattern) by etching. The depth of the recesses of the random pattern is preferably 20 to 200 μm from the viewpoint of keeping the color tone of the stainless steel sheet as uniform as possible even if the rolling distance increases. Here, the depth of the randomly patterned depressions is defined and measured as already described in the first invention.

The size of the random pattern on the surface of the work roll (II) is such that when a closed curve is drawn on each convex portion so as to include one convex portion, the average diameter of an equivalent circle having an area formed by the closed curve is Is preferably 10 to 100 times the value of the dull-processed surface average roughness Ra of the work roll (I), and is preferably 20 to 8 times.
0 times is more preferable.

In a preferred aspect of the second invention, only the convex portions of the random pattern formed on the surface of the work roll (II) are dull-machined by, for example, the electric discharge machining method. The dull-processed convex portion preferably has an average surface roughness Ra of 2 to 15 μm. The dull processing is performed only on the convex portions of the random pattern in this way for the following reason. That is, the etching protrusion surface is the surface before etching,
That is, the surface is a smooth finished surface by a grindstone, and the bottom surface of the recess of the steel plate that is pressed down by the work roll protrusion during rolling is a smooth surface. On the other hand, if the work roll convex portion is dulled, the bottom surface of the steel plate concave portion is also dulled to further improve the antiglare property.

The rolling by the work roll (I) is usually 1
Although rolling may be performed in multiple passes, multiple passes, for example, two to three passes may be performed in order to make the surface of the stainless steel plate a more reliable dull surface. On the other hand, the rolling with the work roll (II) is preferably performed with only one pass in order to avoid the random pattern from overlapping the surface of the stainless steel plate.

The rolling by the work roll (I) and the rolling by the work roll (II) may be performed in any order, and the object of the present invention can be achieved by performing either one first.

FIGS. 2 and 3 are schematic views of the surfaces of the work roll (I) and the work roll (II) and the surface of the stainless steel plate rolled using these work rolls. FIG. 3 shows an aspect in which the convex portion of the random pattern of the work roll (II) is dull-processed.

FIG. 2A shows how the surface of the dull-worked work roll (I) is transferred to the surface of the stainless steel plate. FIG. 2B corresponds to the convex portion 2 of the random pattern of the work roll (II) by rolling the roughened stainless steel plate onto which the surface of the work roll (I) is transferred by the work roll (II). The stainless steel plate surface portion 4 is flattened, and the stainless steel plate surface portion 3 corresponding to the recesses 1 having the random pattern is still roughened.

As with FIG. 2A, FIG. 3A shows how the surface of the work roll (I) is transferred to the surface of the stainless steel plate and roughened. FIG. 3B shows a state in which the convex portions 2 of the random pattern of the work roll (II) are roughened, so that the corresponding stainless steel plate surface portion 4 is also roughened. Of course, the stainless steel plate surface 4 corresponding to the work roll concave portion 1 remains roughened by the work roll (I).

In both the first and second inventions, the rolling according to the method of the present invention is carried out after the rolling with the work roll having a smooth surface in the cold rolling step.
After completion of the rolling, an annealing / pickling step may be performed, and then rolling according to the method of the present invention may be performed.

[0023]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. In the following examples, the surface properties of stainless steel sheets were measured according to the following methods.

(1) Glossiness (60 °) According to JIS B8741, an incident angle of 60 ° and a light receiving angle of 6
The 0 degree glossiness was measured. (2) Luminance Ring illumination was applied from a direction perpendicular to the test piece surface, and the light intensity at a light receiving angle of 70 ° was measured. (3) Surface average roughness Ra The center line average roughness Ra defined in JIS B 0601 was measured using a stylus type surface roughness meter.

Example 1 SUS304 having a plate thickness of 3.6 mm that has been annealed and pickled
A large number of hot-rolled coils were used as raw materials, and cold-rolled with a smooth work roll to a plate thickness of 1.05 mm using a Sendzimir mill. Subsequently, it was rolled to a plate thickness of 1.0 mm by a work roll for dull finishing prepared by combining etching and electric discharge machining. The depth of the concave portions of the random pattern of the dull finishing work roll was in the range of 80 to 100 μm, and the average surface roughness Ra of the surface of the convex portions of the random pattern was 5 μm. After the rolling, the product coil was subjected to the usual annealing / pickling process, and a stainless steel plate sample was taken from the product coil to examine the antiglare property and the color tone. Table 1 shows the results
It was shown to.

Comparative Example 1 A test roll was used except that the work roll for dull finishing used in Example 1 was replaced by a work roll (surface average roughness Ra: 5 μm) only subjected to dull processing by conventional electro-mechanical processing. Example 1 was repeated. The results are shown in Table 1.

Example 2 SUS304 having a plate thickness of 3.6 mm that has been annealed and pickled
A large number of hot-rolled coils were used as materials, and cold-rolled with a smooth work roll to a plate thickness of 1.10 mm using a Zemi-Dimia mill. Next, using a work roll (I) whose surface is dull-processed (surface average roughness Ra: 5 μm), a work roll having a plate thickness of 1.05 mm finished by one-pass rolling and having a random pattern formed on the surface by etching Using (II) (depth of recesses of random pattern: 80 to 100 μm), the plate thickness was finished to 1.0 mm by one-pass rolling. After rolling, the same operation as in Example 1 was performed to measure the surface physical properties of the stainless steel plate. The results are shown in Table 1.

Example 3 In Example 2, the work roll (II) was subjected to dull machining of the convex portions of the random pattern by the electric discharge machining method (the depth of the concave portions of the random pattern: 80 to 100 μm, the surface average of the convex portions). Example 2 except that roughness Ra: 4 μm) is used.
Was repeated. The results are shown in Table 1.

[0029]

[Table 1]

From the above results, the following can be concluded. (1) The glossiness represents the intensity of specular reflection light, and the smaller the value, the better the antiglare property. According to the method of the present invention, the glossiness is remarkably reduced as compared with the conventional method and the antiglare property is excellent. (2) Luminance indicates the intensity of scattered light. The higher the luminance, the more whitish the color tone, and the smaller the luminance, the darker the color tone. Therefore, according to the method of the present invention, it can be seen that the change in luminance with an increase in rolling distance is significantly smaller than that in the conventional method, that is, the uniformity of color tone is maintained.

[0031]

The dull-finished stainless steel sheet produced by the method of the present invention has unevenness due to etching on the conventional dull-finished surface, so that the antiglare property is remarkably improved (the intensity of specular reflection light is reduced. In addition, since the unevenness due to etching is sufficiently deep, the uneven shape transferred to the plate surface is small even if the roll wear is slightly advanced, and the change in color tone due to the increase of the rolling distance is small. Therefore, the application of stainless steel plates to building materials is greatly promoted.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a surface state of a work roll used in the present invention and a surface state of a stainless steel plate on which the surface is transferred.

FIG. 2 is a diagram schematically showing a surface state of a work roll used in the present invention and a surface state of a stainless steel plate to which the surface is transferred.

FIG. 3 is a diagram schematically showing a surface state of a work roll used in the present invention and a surface state of a stainless steel plate on which the surface is transferred.

[Explanation of symbols]

1 Random pattern concave part of work roll surface 2 Random pattern convex part of work roll surface 3 Stainless steel plate surface part corresponding to random pattern concave part of work roll surface 4 Stainless steel plate corresponding to random pattern convex part of work roll surface Surface part

Claims (6)

[Claims] 1. A stainless steel plate is rolled using a work roll in which a random pattern having no directionality is applied to the surface by an etching method and only the convex surface of the pattern is dull-processed. Manufacturing method of dull finish stainless steel sheet. 2. The surface of the work roll is dull processed by an electric discharge machining method, and the surface average roughness Ra of that portion is 2 to 15.
The manufacturing method according to claim 1, wherein the depth of the concave portion of the pattern formed on the surface by the etching method is in the range of 20 to 200 µm. 3. A work roll (II) having a random pattern having no directionality on the surface by rolling and etching by the work roll (I) having a dulled surface.
A method for producing a dull-finished stainless steel sheet, which is characterized by combining rolling according to. 4. The surface average roughness Ra of the work roll (I).
Is in the range of 2 to 15 μm, and the depth of the concave portion of the pattern formed on the surface of the work roll (II) is in the range of 20 to 200 μm. 5. The manufacturing method according to claim 3, wherein only the surface of the convex portion of the pattern formed on the surface of the work roll (II) is dull-processed. 6. The surface average roughness Ra of the work roll (I).
Is in the range of 2 to 15 μm, the depth of the concave portion of the pattern applied to the surface of the work roll (II) is in the range of 20 to 200 μm, and the dull machining of the convex portion is performed by the electric discharge machining method.
The manufacturing method according to claim 5, wherein the surface average roughness Ra of the protrusions is in the range of 2 to 15 µm.