JP2941458B2 - Rolling roll surface processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface treatment of a rolling roll for rolling a steel plate (belt) for processing, which is applied to an outer plate of an automobile or a home electric appliance and has excellent paint clarity. It is about the method.

[0002]

2. Description of the Related Art In general, the body of an automobile or the outer panel of a home electric appliance is painted, and the appearance that appeals to the eye together with the quality of the product is an important factor in stimulating customer demand.
Quality control of this coating is emphasized. In particular, the exterior coating of automobiles is required to have not only color tone but also so-called coating sharpness such as glossiness with less irregular reflection on the coating surface and image clarity without distortion like a mirror surface.

[0003] The sharpness of the coating is usually determined by the specular gloss of the painted surface, that is, a light beam having an opening angle specified by the incident angle specified on the sample surface as specified in JIS Z8741 and the specular reflection direction. A light beam having a specified opening angle that is reflected by the light beam is measured by a light receiver, and it is said that the larger the measured value, the better. On the other hand, it is said that the sharpness of the paint depends greatly on the roughness of the steel sheet surface, though it depends on the thickness of the paint.

[0004] By the way, a rough surface of a fine uneven pattern is usually formed on a cold-rolled steel sheet for processing, and this is supplied to the unevenness on the surface of the steel sheet at the time of working such as press working of the steel sheet. The lubricating agent plays a role of improving workability and preventing seizure with the press die by retaining the lubricant.

In order to form a rough surface on such a steel plate surface,
This is performed by transferring an unevenness on the work roll surface of a cold rolling mill or a temper rolling mill or an unevenness pattern formed by processing the surface.

Conventionally, a method of forming a concavo-convex pattern by processing a roll surface includes a shot blast method and a discharge dull processing method. However, the concavo-convex pattern formed by these methods forms an irregular roughness profile, and the same irregular pattern can be obtained by transferring it to a steel sheet. When coating is performed on such a steel sheet surface, a coating film is formed along irregular irregularities, and irregular reflection of light occurs, thereby significantly deteriorating the sharpness of the coating.
In particular, the surface-processed cold-rolled work roll generates "undulations" having a longer wavelength than that of the work roll along with the concavo-convex pattern, which is a cause of deterioration in the sharpness of the coating.

Further, the workability of the steel sheet rolled by the above-mentioned surface processing roll is slightly inferior due to the presence of irregular irregularities. In particular, in a thick galvanized steel sheet, irregular irregularities are remarkable, and the deterioration of workability is further increased.

In order to improve the surface properties of the steel sheet by the above-mentioned conventional treatment, the surface crater pattern of the roll having a center line average roughness Ra of 1 μm or less by laser or shot blast and the like and the surface crater pattern of the temper roll have a predetermined value. Japanese Patent Application Laid-Open No. 62-224405 discloses that rolling is performed using a pressure adjusting roll processed by a laser so that
Japanese Patent Application Laid-Open No. 63-132702 discloses a method in which a concavo-convex pattern is formed by rolling using a pressure adjusting roll laser-processed into a predetermined crater pattern so as to have a predetermined flat portion on the surface of the steel sheet.
Issue.

[0009] However, a regular uneven pattern can be transferred from the laser-processed roll to the surface of the steel sheet, but the crater interval is long, and thus a so-called "undulation" component having a large wavelength is generated, resulting in a fresh paint. A problem arises that affects the image quality.

[0010]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and it is an object of the present invention to reduce unevenness components formed on the surface of a work roll for cold rolling or temper rolling to a flattened height. Or more regularly reformed, and when the components are transferred to the surface of the steel sheet, there is no undulation or the like, the coating is excellent in sharpness, and the rolling to produce a cold-rolled steel sheet with good workability. It is an object of the present invention to provide a method for processing the surface of a roll.

[0011]

In order to achieve the above-mentioned object, the present invention provides a roll having a roughened surface with minute irregularities, and then performs a grinding process on the convex portion of the surface to reduce minute undulations. After grinding, or after grinding the roll surface with a rough surface with minute irregularities and rough undulations,
A gist of the present invention is a method for surface treatment of a rolling roll, which is characterized by performing uneven processing. In the present invention,
The concavo-convex processing to be applied to the roll surface with a fine rough surface
It is preferably performed by a lithography method. It is also an aspect of the present invention to perform a surface treatment on the roll-processed surface after the above-mentioned concavo-convex processing or polishing processing.

[0012]

The present invention will be described below in detail. Conventionally, roughness is imparted to the surface of a rolling roll directly by shot blasting, discharge dulling, or the like, or by laser beam irradiation. For example, as shown in an enlarged cross section in FIG. The uneven protrusions 2 on the surface form undulations 3 having a large wavelength λ. As described above, the steel sheet on which such undulating irregularities are transferred deteriorates the sharpness of the coating, and if the difference between the formed irregularities is large, the workability is impaired.

According to the present invention, in order to improve the workability of the steel sheet and the sharpness of the coating, the surface roughness of the work roll applied to the steel sheet surface is made to be uneven projections flattened to a substantially constant height,
Little undulation components, or even remain which forms an extremely short wavelength lambda uneven pattern (λ ≦ 500μm). That is, the steel sheet rolled by the rolls forms an appropriate roughness on the surface, retains the lubricating oil, imparts good workability, and paints the concave portions formed on the surface during the paint baking treatment. The influence of the shrinkage of the steel sheet is reduced, and the unevenness on the steel plate disappears on the coating film, and the sharpness after coating can be improved.

FIG. 1 shows an example of the manufacturing process of the present invention. FIG. 1 (a) shows the surface of a roll 1 (including a rough surface formed by a conventional method as shown in FIG. 6) having a fine rough surface. As shown in FIG.

One example of the method of forming the projections and depressions 4 on the surface of the roll 1 is a lithography method as shown in FIGS. 2A to 2D. That is, first, a photosensitive resist agent 7 is supplied to the roll surface from a hopper 6 installed on the roll 1, and a resist agent coating layer (film) 9 is attached and formed while adjusting the thickness to a predetermined thickness by a squeegee 8 [( a) Figure]. Next, the photosensitive resist layer 9
Is irradiated intermittently with a laser beam 11 emitted from a laser transmitter 10 at a predetermined regular pitch, and the resist layer in this portion is subjected to photopolymerization 14 (FIG. 9B). In FIG. 2B, the chopper 13 having the slit 12 is used, and the beam 11 is intermittently irradiated while rotating the chopper 13. However, the present invention is not limited to this, and a pulse laser or the like may be used. Subsequently, as shown in FIG. 3C, when a dissolving agent 16 such as trichloroethane is sprayed from the sprayer 15 onto the surface of the treated roll, as shown in FIG. Is dissolved and removed, and the roll surface 17 is exposed.

Thereafter, anisotropic etching is carried out with a chemical corrosive agent to form a concave portion and form a regular concave / convex pattern as shown in FIG. 1 (a). It is preferable that the surface is subjected to unevenness processing by shot blast, discharge dull, laser or the like. After that, or before the unevenness imparting process such as shot blasting, the resist polymerization portion 14 is dissolved and removed. Swell 3 seen in the uneven pattern in this state
Can be reduced, but not eliminated.

[0017] In the present invention therefore, the machining treated roll surface, inclined oblique polishing, wet blasting, lapping of the like magnetic fluid polishing or the magnetic brush, uneven as shown in (b) diagram of Figure 1 Almost constant height h
Then, a flat surface 18 is formed to form a roll surface having a regular concavo-convex pattern almost eliminating minute waviness.

Further, according to the present invention, abrasion resistance and corrosion resistance can be imparted and fine irregularities can be grown by performing Cr plating 19 on the polished surface as required.

FIG. 3 shows another example of the present invention. The roll surface having fine irregularities is first subjected to the above-mentioned polishing to form a substantially flat surface 20 as in FIG.
Figure], after removing the undulation component formed on the surface,
Surface processing is performed by lithography [(b) diagram]. In this case, it is a matter of course that unevenness imparting processing such as shot blasting may be used together as in FIG. Thereby, a regular uneven pattern having a substantially flat surface 18 can be formed. Further, it is the same as FIG. 1 that a Cr plating 19 may be formed on this surface [ FIG. 1 (c)] . Note that the above-described polishing may be replaced with a roughness adjusting process 21 for performing a minute process such as shot blasting or discharge dulling.

FIG. 4 shows that after the surface of the roll has been subjected to roughness adjustment processing (FIG. 4 (a)), surface processing by lithography (FIG. 4 (b)) (concavo-convex processing can also be used), followed by polishing. [FIG. 3 (c)], and a step of applying Cr plating 19 is added if necessary [(d)].
Figure] shows another example.

[0021]

EXAMPLE The surface of a work roll for temper rolling was worked in the following manner, and a cold rolled steel sheet having a thickness of 0.8 mm was subjected to temper rolling at a rolling reduction of 0.8%. After coating the obtained steel plate, the coating sharpness was measured. The measurement test was performed according to JIS Z8741 "Method for measuring specular gloss". Table 1 shows the results.

Method of the present invention = Unevenness processing (lithography method)
-Polishing process (incline polishing) The present invention method = polishing process (incline polishing)-unevenness process (lithography method) The present invention method = unevenness process (lithography method)-roughness adjustment process (shot blast)-polishing process (incline polishing) The present invention method: concavo-convex processing (lithography method)-polishing processing (inclined polishing)-Cr plating Conventional method = shot blast processing

[0023]

[Table 1]

From the above results, since the steel sheet rolled by the roll of the present invention has a rough surface having a regular uneven pattern without undulation, as compared with the steel sheet obtained by the roll of the conventional method, Is remarkably excellent, and it is apparent that the press workability can be processed without seizure.

The method of the present invention And conventional temper rolling
FIG. 5 shows the results of measuring the roll life. The result of the figure
The abrasion resistance of the roll produced by the method of the present invention is extremely high.
It turns out that it is excellent. The same applies to other rolls of the present invention.
It was like.

[0026]

As described above, according to the present invention, the unevenness component formed on the surface of the work roll is modified and arranged at a flattened height or more regularly. This component is transferred to the steel sheet surface by rolling using
In addition, a cold-rolled steel sheet having good workability can be manufactured.

[Brief description of the drawings]

1 (a), 1 (b) and 1 (c) schematically show an example of a process of forming a concavo-convex pattern on a roll surface according to the present invention.

FIGS. 2 (a), (b), (c) and (d) are explanatory views showing an example of the unevenness imparting processing step of the present invention by a lithography method.

FIGS. 3 (a), (b) and (c) schematically show another example of the step of forming a concavo-convex pattern on the roll surface of the present invention.

FIGS. 4 (a), (b), (c) and (d) schematically show another example of the step of forming a concavo-convex pattern on the roll surface of the present invention.

FIG. 5 shows the relationship between the rolling distance and the surface roughness (wear) of the roll.

FIG. 6 shows a concavo-convex pattern on a roll surface subjected to a conventional dull (concavo-convex) processing.

[Explanation of symbols]

 1: Roll 2: Uneven projection 3: Undulation 4: Processing projection 6: Hopper 7: Photosensitive resist agent 8: Squeegee 9: Photosensitive resist layer 10: Laser transmitter 11: Laser 12: Slit 13: Chopper 14: Photopolymerization section 15: Sprayer 16: Solvent 17: Exposed section 18: Flat surface 19: Cr plating 20: Roughness adjustment processing section

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tetsuya Nishiura 5-3 Tokai-cho, Tokai-shi, Aichi Prefecture Nippon Steel Corporation Nagoya Works (56) References JP-A-62-224405 (JP, A) JP-A-4-351204 (JP, A) JP-A-63-238902 (JP, A) JP-A-5-50118 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B21B 27 / 00-35/14 B21B 1/22 B24B 5/37 C23F 1/00 102

Claims (6)

(57) [Claims] 1. A method for processing a surface of a roll, wherein a surface of a roll having a fine rough surface is roughened, and a convex portion of the surface is polished to grind a fine waviness. 2. The method according to claim 1, further comprising:
2. The method according to claim 1, wherein the surface is processed by lithography. 3. A method of processing a surface of a rolling roll, wherein the surface of a roll having a fine roughened surface is polished to grind small undulations, and then the unevenness is formed. 4. The method according to claim 3, wherein the unevenness is formed by a lithography method. 5. The method according to claim 5, wherein the surface of the roll having the fine rough surface is subjected to lithography, and then the convex portion of the surface is polished to grind the minute waviness, and then the processed surface is subjected to surface treatment. A method for processing a surface of a rolling roll. 6. The method according to claim 1, wherein the surface of the roll having the fine roughened surface is polished to grind the fine waviness, and then the unevenness is processed by a lithography method, and then the processed surface is subjected to a surface treatment. Rolling roll surface processing method.