JP2954003B2 - Manufacturing method of dull finish stainless steel plate - Google Patents

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 interior and exterior of buildings, and which is particularly excellent in anti-glare properties and color tone uniformity.

[0002]

2. Description of the Related Art Recently, stainless steel sheets have been frequently used as building materials for interior and exterior of buildings. The reason is,
This is because the properties of stainless steel such as corrosion resistance and beauty have been utilized in building materials. However, when used as an exterior material, it often poses a problem from the viewpoint of antiglare properties due to the beauty of the surface of the stainless steel plate. As one of the methods for satisfying the antiglare property, the use of a dull-finished stainless steel sheet is effective. As described in, for example, Japanese Patent Application Laid-Open No. 4-46612, a dull-finished stainless steel sheet is generally manufactured by rolling using a work roll subjected to satin finish (dull processing) by shot blasting or electric discharge machining. Is the way.

The dull-finished stainless steel sheet manufactured by the above-described method has the following problems. (1) Under direct sunlight, the anti-glare property is not always sufficient. (2) As the rolling distance increases, the roughness of the work roll dulling surface decreases due to wear, so the surface roughness of the stainless steel plate also changes to a finer surface, and the surface color changes according to the change. Is inadequate.

[0004]

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

[0005]

SUMMARY OF THE INVENTION The above objects and advantages of the present invention are as follows. First, a random pattern having no directivity is formed on the surface by etching, and only the convex surface of the pattern is dulled. The present invention is achieved by a method for producing a dull-finished stainless steel sheet, characterized in that the stainless steel sheet is rolled by using a work roll. Hereinafter, this invention is referred to as a first invention.

[0006] Further objects and advantages of the present invention are:
Roll (I) having a dulled surface
The present invention also achieves the present invention by a method of manufacturing a dull-finished stainless steel sheet, which comprises a combination of rolling by a work roll and rolling by a work roll (II) having a random pattern with no directionality on the surface by etching. Revealed by them. This manufacturing method is referred to as a second invention.

Hereinafter, the present invention will be described in detail, and other objects, advantages and effects of the present invention will become apparent.

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

The size of the random pattern 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 given to the convex portion described later. It is preferably from 10 to 100 times, more preferably from 20 to 80 times, the value of the surface average roughness Ra subjected to dull machining by the electric discharge machining method.

Further, from the viewpoint of maintaining the color tone of the dull-finished stainless steel plate as uniform as possible even if the rolling distance increases, the depth of the concave portion of the random pattern is preferably from 20 to 200 μm, more preferably from 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 invention, dulling is performed only on the convex portions of the random pattern 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 providing 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 those skilled in the art to give the average roughness Ra to the convex portions of the random pattern as described above.

FIG. 1 is a schematic sectional view of a work roll used in the first invention and a dull-finished stainless steel sheet manufactured in the first invention. FIG. 1 shows a state in which a dulled convex portion 2 of a random pattern of a work roll is transferred as a concave portion 4 on the surface of a stainless steel plate, and a concave portion 1 of the work roll is transferred as a convex portion 3 of a stainless steel plate. ing.

Next, the second invention will be described. Second
The surface of the work roll (I) used in the invention of (1) is subjected to ordinary dulling. Average roughness Ra of the surface
Is preferably 2 μm or more from the viewpoint of imparting sufficient antiglare properties to the stainless steel plate. However, even if it exceeds 15 μm, the effect is saturated. As described above, dulling the surface of the work roll (I) can be performed by a method known per se, for example, a shot blasting method or an electric discharge machining method.

The surface of the work roll (II) is provided with a random pattern (random pattern) having no directivity by etching. The depth of the recesses of the random pattern is preferably from 20 to 200 μm from the viewpoint of keeping the color tone of the stainless steel plate as uniform as possible even when the rolling distance increases. Here, the depth of the concave portion of the random pattern 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 , Preferably 10 to 100 times as large as the value of the dulled surface average roughness Ra of the work roll (I).
0 times is more preferable.

In a preferred embodiment of the second invention, only the projections of the random pattern provided on the surface of the work roll (II) are dulled by, for example, an electric discharge machining method. The surface average roughness Ra of the dulled projection is preferably 2 to 15 μm. The reason why dulling is performed only on the convex portions of the random pattern is as follows. That is, the surface of the etching convex portion is the surface before etching,
That is, it has a smooth finished surface made of a grindstone, and the bottom surface of the steel plate concave portion which is pressed down by the work roll convex portion during rolling becomes a smooth surface. On the other hand, when the convex portion of the work roll is a dulling surface, the bottom surface of the concave portion of the steel plate is also dulled, so that the antiglare property is further improved.

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

The order of rolling by the work roll (I) and rolling by the work roll (II) is arbitrary, and the object of the present invention is achieved by performing either of them first.

FIGS. 2 and 3 are schematic diagrams of the surfaces of the work rolls (I) and (II) and the stainless steel sheets rolled using these work rolls. FIG. 3 shows an embodiment in which the convex portion of the random pattern of the work roll (II) is dulled.

FIG. 2A shows how the surface of the dulled work roll (I) is transferred to the surface of a stainless steel plate. FIG. 2 (b) corresponds to the convex part 2 of the work roll (II) by rolling a stainless steel plate on which the surface of the work roll (I) is transferred and roughened by the work roll (II). The surface portion 4 of the stainless steel plate becomes flat, and the surface portion 3 of the stainless steel plate corresponding to the concave portion 1 having the random pattern remains rough.

FIG. 3 (a) shows a state where the surface of the work roll (I) is transferred to the surface of the stainless steel plate and roughened, as in FIG. 2 (a). FIG. 3B shows a state in which the convex portion 2 of the random pattern of the work roll (II) is roughened, and the corresponding stainless steel plate surface portion 4 is also roughened. Of course, the stainless steel plate surface 4 corresponding to the work roll recess 1 remains roughened by the work roll (I).

In either case of the first invention and the second invention, the rolling by the method of the present invention is performed after the end of the rolling with the work roll having a smooth surface in the cold rolling step.
After the rolling, an annealing / pickling step may be performed, and then the 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 physical properties of the stainless steel plate were measured according to the following methods.

(1) Glossiness (60 °) According to JIS B 8741, the incident angle is 60 ° and the light receiving angle is 6
A gloss of 0 ° was measured. (2) Brightness Ring illumination was applied to the test surface in a direction perpendicular to the 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 thickness of 3.6 mm after annealing and pickling.
A large number of hot-rolled coils were used as materials, and cold-rolled by a Sendzimir mill to a thickness of 1.05 mm using a smooth work roll. Subsequently, it was rolled to a sheet thickness of 1.0 mm by a dull finishing work roll prepared by combining etching and electric discharge machining. In addition, the depth of the concave portion 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 portion of the random pattern was 5 μm. After the rolling, a product coil was formed through a usual annealing and pickling process, and a stainless steel plate sample was collected from the product coil, and the antiglare property and color tone were examined. Table 1 shows the results
It was shown to.

Comparative Example 1 A work roll (surface average roughness Ra: 5 μm) subjected to only dulling by conventional electroforming was used in place of the work roll for dull finishing used in Example 1. Example 1 was repeated. The results are shown in Table 1.

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

Example 3 In Example 2, the work roll (II) was obtained by subjecting a random pattern convex portion to dull machining by an electric discharge machining method (depth of the random pattern concave portion: 80 to 100 μm, surface average of the convex portion). Example 2 except that roughness (Ra: 4 μm) was 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 indicates the intensity of specularly reflected 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) The luminance indicates the intensity of the scattered light, and the higher the luminance, the more the white tone, and the lower the luminance, the darker the color. Therefore, according to the method of the present invention, it can be seen that the luminance change with respect to the increase in the rolling distance is much smaller than that of the conventional method, that is, the uniformity of the color tone is maintained.

[0031]

The dull-finished stainless steel sheet manufactured by the method of the present invention is provided with 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 the etching is sufficiently deep, the change in the uneven shape transferred to the plate surface is small even if the roll abrasion is slightly advanced, and the color tone change due to the increase in the rolling distance is small. Therefore, application of the stainless steel sheet to building materials is greatly promoted.

[Brief description of the 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 to 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 to which the surface is transferred.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21B 1/22 B21B 3/02

Claims (6)

(57) [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 dulled. Manufacturing method of dull finish stainless steel plate. 2. The surface of a work roll is dulled by an electric discharge machining method, and the surface has a surface average roughness Ra of 2 to 15
2. The 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 a range of 20 to 200 μm. 3. A work roll (II) in which a random pattern having no directionality is formed on the surface by rolling and etching with a work roll (I) having a dulled surface.
A method for producing a dull-finished stainless steel sheet, characterized by combining rolling with a stainless steel sheet. 4. The surface average roughness Ra of the work roll (I)
The manufacturing method according to claim 3, wherein 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 method according to claim 3, wherein only the surface of the convex portion of the pattern applied to the surface of the work roll (II) is dulled. 6. The average surface 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 processing of the convex portion is performed by an electric discharge machining method.
The production method according to claim 5, wherein the surface average roughness Ra of the projection is in a range of 2 to 15 m.