JPH1035974A - Steel sheet carrying roll for continous electrolytic cleaning line and oil application line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent the adhesion of a foreign matter such as scum to a carrying roll by coating a recessed part on the carrying roll surface with a resin. SOLUTION: The recessed part 2 of a carrying roll 1 is coated with a resin 5 to cover and smooth fine irregularities 4 formed on the worked surface (low part or side wall) of the recessed part 2. To form protruding and recessed parts by chemical etching, for example, a resist is applied to the carrying roll surface (whole surface) to sensitize and harden the part corresponding to a protruding part, and the resist in the non-sensitized part (non-hardened part) corresponding to the recessed part 2 is washed and removed. The resist removed part is chemically etched by the contact with an etching solution to form the recessed part 2. Thereafter, the resin is sprayed thereon to cover the recessed part 2, and the resist of the protruding part 3 is then removed. Thus, a foreign matter such as scum is hardly captured by the fine irregularities 4 on the bottom part of the recessed part 2, and the side wall of the recessed part is also smoothed by the resin, so that the adhesion of the foreign matter such as scum thereto can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll for conveying a steel strip in a continuous electrolytic cleaning line and an oil coating line.

[0002]

2. Description of the Related Art It has been known that, as a transport roll for a steel strip process line, the surface of the roll is formed with irregularities to make it slip-resistant and to prevent the occurrence of scratches on the steel strip. Also,
As a method of forming irregularities on the roll surface, a method by chemical etching is disclosed in Japanese Patent Application Laid-Open No. 7-108314.

[0003]

As described above, when a steel strip passing through a continuous electrolytic cleaning line and an oil coating line is transported by a transporting roll, the metal soap or oil coating is formed in the recess in the continuous electrolytic cleaning line. In the line, scum-based (mixture of oil coating agent and iron powder) adheres and accumulates and is transferred to the surface of the conveying steel strip to generate stains, and the steel plate and the roll may slip or meander. In order to solve such difficulties, it is a fact that the line is periodically stopped and, depending on the line, more than a dozen transporting roll surfaces are cleaned, and maintenance such as re-surface treatment is performed. Therefore,
Productivity declines due to a decrease in the operating rate due to the line stoppage,
In addition, there is a problem that a large amount of labor is required for cleaning the transport roll. In particular, as shown in FIG. 3, when the transfer roll as described above is formed with three concave portions and two convex portions on the surface of the transfer roll 1 by chemical etching, the processed surface (bottom portion or side wall) of the concave portion 2 is formed.
Since the fine irregularities 4 are formed on the surface, foreign substances such as scum are easily trapped by the fine irregularities 4, and the cleaning of the transport roll 1 is required in a short period of time, which further reduces the productivity. The present invention has been made in order to advantageously solve such a problem, and a steel strip continuous electrolytic cleaning line excellent in resistance to foreign matter such as scum by coating a resin on a concave portion of an uneven portion formed on a surface. It is an object of the present invention to provide a roll for conveying a steel strip in an oiling line.

[0004]

A feature of the present invention is that a concavo-convex portion is formed on the surface of a roll, and the concave portion is coated with a resin. Roll.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION As described above, the concaves and convexes formed on the surface of the steel strip conveying roll of the continuous electrolytic cleaning line and the oiling line have a concave depth of 5 to 100 μm, and the convex shape is a cylinder, a prism, or the like. The slip of the steel strip can be surely prevented at a convex area smooth area ratio of 10 to 80% (almost equidistant). And flatten the fine irregularities on the bottom and side walls of the concave portions to prevent foreign matter adhesion and deposition such as scum. That is, as shown in FIG.
The resin 2 is coated on the concave portion 2 of the concave portion 2 and the convex portion 3, and the fine unevenness 4 formed on the processing surface (bottom and side walls) of the concave portion 2 is flattened. In addition to making it difficult to catch foreign matter such as scum due to the fine irregularities 4, the side wall of the concave portion 2 can also be flattened with resin to prevent foreign matter such as scum from adhering. It prevents adhesion to the surface.

As described above, as a method of coating the concave portion with the resin, for example, when forming the concave and convex portion by chemical etching, first, a resist agent is applied to the surface (entire surface) of the transport roll, and a portion corresponding to the convex portion is formed. After the photo-curing, the resist agent in the unexposed portion (uncured portion) corresponding to the concave portion is washed and removed, and then the resist agent is brought into contact with an etching solution to chemically etch the resist agent removed portion to form the concave portion. Form a part. Thereafter, the resin can be applied to the concave portion by spraying and coating without removing the resist agent on the convex portion, and then the resist agent on the convex portion is removed.

When forming an uneven portion on the surface of the transporting roll by electrolytic etching, first, a resist agent is applied to the entire surface of the transporting roll (the entire surface), and a portion corresponding to the convex portion is photosensitive-cured, and then a portion corresponding to the concave portion. The resist agent in the unexposed portion (uncured portion) was washed and removed, and then the transport roll 1 was mounted on the electrolytic etching apparatus 13 as shown in FIG. ２５25%) flows down from the nozzle 9 to the transport roll 1 via the pump 8, flows along the transport roll 1, flows into the electrolytic etchant tank 6 from the electrolytic etchant receiving pan 10, and from the electrolytic etchant tank 6 again. While circulating to the nozzle 9, the carrier roll 1 is brought into downward contact with the surface of the carrier roll 1. The cathode, the conveyor roll 1 by passing current of the current line density 3~15A / cm from the power source 12 as an anode, to form the uneven portion by processing a recess resist agent removal site by electrolytic etching.

[0008] As described above, the resin to be coated on the concave portion is a resin which is hardly chemically reacted with metal soap, scum or the like, for example, a fluororesin, (PTFE: polytetrafluoroethylene resin, FEP: polytetrafluoroethylene- It is preferable to use propylene hexafluoride copolymer resin, PFA: ethylene hexafluoride-perfluoroalkyl vinyl ether copolymer resin, or the like. With a coating thickness of 3 to 30 μ, adhesion of foreign substances such as scum to the concave portion can be reliably prevented.

Such a transport roll according to the present invention is, for example, a roll for transporting a steel strip after cleaning in a continuous electrolytic cleaning facility for a steel strip, a backup roll for a tension leveler in a steel strip coil preparation equipment (CPL) oiling line, and the like. Can be applied effectively.

[0010]

Next, examples of the present invention will be described together with comparative examples.

[Table 1]

Note 1: Roll material is steel for general structural steel. Note 2: Asperity formation on the surface of the transport roll is described in Examples 1, 3,
5, Comparative Examples 1, 3, and 5 were formed by a general chemical etching method.
In Comparative Examples 2, 4, and 6, the resist agent was applied to the portions corresponding to the concave portions and photosensitive-cured, and after removing the resist agent in the unexposed portions, the aqueous sodium chloride solution (10 to 25%) was flowed down from the upper portion of the rotating transport roll. The electrode at the flow-down portion was a cathode, the transport roll was an anode, and the peripheral speed of the transport roll was 10 to 40.
mpm and a current linear density of 3 to 15 A / cm by electrolytic etching. Note 3: PFA of resin: ethylene hexafluoride-perfluoroalkyl vinyl ether copolymer resin, FEP: ethylene tetrafluoride-propylene hexafluoride copolymer resin, PTFE: polytetrafluoroethylene resin. Note 4: The application site is BR: tension roller backup roll of oiling line for steel coil coil preparation equipment, DL: steel strip transportation after cleaning in continuous electrolytic cleaning equipment (electrolyte: alkaline aqueous solution 10%, liquid temperature 40 ° C) For roll. In this way, the comparative example shows 1
At intervals of 0 weeks, the operation of the equipment was stopped for 8 hours to remove scum and the like adhering to the concave portion of the transport roll, and cleaning, resurfacing and other maintenance were performed. On the other hand, in the example, maintenance was not required, and the operation rate of the equipment was significantly improved.

[0012]

According to the present invention, the stoppage of the equipment due to the cleaning of the transport roll due to the adhesion of foreign substances such as scum can be significantly reduced, and the operation rate of the equipment can be improved and the productivity can be improved. In addition, it is possible to reliably prevent foreign substances such as scum from adhering to the transfer roll and to reduce contamination of the steel strip, thereby improving the quality of the steel strip and increasing the product yield. Excellent effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a transport roll of the present invention.

FIG. 2 is a front view showing an example of forming an uneven portion on the surface of a transport roll.

FIG. 3 is a sectional view of a main part of a conventional transport roll.

[Description of Signs] 1 Conveyance roll 2 Concave portion 3 Convex portion 4 Fine unevenness at bottom of concave portion 5 Resin

Claims (2)

[Claims] 1. A roll for transporting a steel strip in a continuous electrolytic cleaning line and an oil coating line, wherein the roll surface is formed with irregularities and the concave portions are coated with a resin. 2. The roll for conveying a steel strip in a continuous electrolytic cleaning line and an oil coating line according to claim 1, wherein the depth of the concave portion is 5 to 100 μm and the ratio of the convex portion smooth area is 10 to 80%.