JPH03104898A - Cleaning brush roll of conductor roll for electroplating steel sheet - Google Patents

Abstract

PURPOSE:To clean a conductor roll and to prevent a decrease in the surface precision of a plated steel sheet by using a cleaning brush roll obtained by implanting all automatic polyamide fiber-based bristles in the periphery of a roll core in the radial direction of the core. CONSTITUTION:A band steel 6 is traveled between the electrodes 4 in a plating bath 3, and the formed plating layer is controlled by a conductor roll 5 in contact with the steel 6. In this steel sheet electroplating line, a rotating brush roll 7 is brought into contact with the conductor roll 5 which is hereby cleaned. The brush roll 7 is formed by implanting the all aromatic polyamide fiber-based bristles 2 or the bristles contg. an abrasive in the periphery of the roll core 1 consisting of a roll shell 11 and a shaft part 12 in the radial direction of the core 1. The implantation can be performed by stringing a metallic wire 21 obtained by fixing the twice-folded bristle on the surface of the roll core. The bristle 2 exhibits excellent corrosion resistance and mechanical strength at high temp., the surface of the conductor roll 2 is cleaned, and a decrease in the surface precision of the plated steel sheet is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a cleaning brush roll for a conductor roll for electroplating steel plates.

(Conventional technology) Electroplated steel sheets are often used for the outer panels of products such as automobiles and home appliances, focusing on the surface characteristics of electroplated steel sheets, but recently, in order to increase the added value of products, ,
Surface precision of steel plates is required.

Conventionally, when manufacturing electroplated steel sheets, such as electrogalvanized steel sheets, hot-rolled wide steel strips or tempered cold-rolled steel strips are used as raw materials.
After performing pre-treatments such as degreasing, cleaning, and pickling, electricity is passed through multiple rows of electrodes in a plating bath containing sulfate, etc., and zinc ions in the bath are precipitated and attached to the surface of the copper strip. The plated layer is shaped and then subjected to post-processing such as washing with water to create a product, but in this case, the thickness of the plated layer changes if the current value changes depending on the sulfate bath or the surface conditions of the copper strip. Since the surface accuracy deteriorates, a conductor roll is disposed between the electrode rows, and the current value is controlled to be constant while the conductor roll is brought into rotational contact with the copper strip.

(Problem to be Solved by the Invention) However, as the plating bath ages or dirt adheres to the copper strip and is brought into the plating bath, and impurities and dirt in the plating bath adhere to the conductor roll, the width of the copper strip decreases. There was a problem that variations occurred in the current value in the direction, and the conductor roll damaged the plating layer on the surface of the copper strip, resulting in a decrease in the surface accuracy of the electrogalvanized steel sheet.

A conceivable way to solve these problems is to clean the surface of the conductor roll with a grindstone, a nylon brush roll, or a steel brush roll, for example.

However, when using a grindstone, there is a concern that the abrasive grains separated from the grindstone may contaminate the plating bath.

On the other hand, when using a brush roll, there is no problem of contaminating the mebuki bath, but electric zinc nobuki baths are kept at high temperatures, for example around 100°C, and the agate liquid evaporates, making the atmosphere highly corrosive. Due to the extremely difficult conditions in the industry, the use of nylon or steel brush rolls as described above is not possible. In view of these problems, it is an object of the present invention to provide a cleaning brush roll for a conductor roll for electroplating a steel sheet, which can prevent a decrease in the surface precision of plated steel due to 7η staining on the surface of the conductor roll.

As a result of intensive research to solve the above-mentioned problems, the inventor of the present invention discovered that fully aromatic polyamide fibers, which have recently been developed and put into practical use, have excellent mechanical properties in high-temperature corrosive atmospheres as mentioned above. The present invention has been fully exploited by focusing on the following. (Means for Solving the Problems) Therefore, the present invention provides a cleaning brush roll for a conductor roll for electric steel sheet electric agate, which is used in a steel sheet electroplating line equipped with a conductor roll for controlling a steel plate plating layer. A brush roll for cleaning the surface, which includes fully aromatic polyamide fiber-based bristles or fully aromatic polyamide ξ mm-based bristles containing an abrasive, extending radially in the radial direction of the shaft core on the outer peripheral surface of the roll shaft core. The gist is that the plant was planted in such a way that

Here, as the wholly aromatic boryamide fiber bristles, for example, those sold by Teijin Ltd. under the trade name Conex can be used, and if necessary, other types of fibers, such as carbon fibers, may be blended and woven. It is also possible to improve heat resistance and wear resistance. In addition, the diameter of the wholly aromatic polyamide fiber bristles may be determined through experiments in relation to the material of the conductor roll to be cleaned, taking into consideration breakage resistance, etc. For example, conductor roll! When the material of the hole is Hastelloy, it is desirable that the material be 400 denier or more.

In addition, the method of implanting fully aromatic polyamide fiber bristles may be to drill a plurality of holes on the surface of the roll axis and insert and adhere the bristles into the holes, or by folding the bristles in half and fixing them to a metal wire. ,
This may be wound around the surface of the roll shaft core, or a hole may be bored all around the outer edge of the annular disk, bristles are passed through the hole, the bristles are passed through the hole, the fibers are folded in half, and this is fixed, and this is attached to the surface of the roll shaft core. You can.

Further, the material and particle size of the abrasive to be contained in the wholly aromatic boria fi+'' fiber bristles may be determined through experiments or the like in relation to the material of the conductor roll to be cleaned.

Further, the abrasive may be uniformly dispersed within the bristles, or may be in the form of a sandwich in which the abrasive layer is sandwiched between fiber layers on both sides. (Function) In the present invention, fully aromatic polyamide fiber-based bristles or fully aromatic polyamide fiber-based bristles containing an abrasive are implanted on the surface of the roll axis, and the surface of the conductor roll is cleaned with these bristles. As a result, the plating bath is not contaminated compared to when using a conventional whetstone, and the bristles of the brush roll are not corroded even in a high-temperature corrosive atmosphere such as an electrogalvanizing bath atmosphere. It does not melt and keeps the surface of the conductor roll in the steel plate electric mesoki line clean.

(Example) Hereinafter, the present invention will be described in detail based on specific examples shown in the accompanying drawings.

1 to 3 show a cleaning brush roll of a conductor roll for steel electric agate according to an embodiment of the present invention.

In FIGS. 1 and 2, 1 is a roll axis, and the roll axis l is composed of a roll body 11 and a shaft part 12, and the shaft part 12 is fitted into openings at both ends of the roll paulownia 11. It has been welded and fixed.

On the other hand, the wholly aromatic polyamide fiber-based bristles 2 are folded in half and attached to the metal wire 2l, and the two rows of the wholly aromatic polyamide fiber-based bristles are wound around the outer peripheral surface of the roll shaft core l, In this manner, fully aromatic polyamide fiber bristles 2 are implanted on the outer peripheral surface of the roll shaft core 1 so as to extend radially in the radial direction of the shaft core. Here, as the wholly aromatic polyamide fiber, an aramid fiber manufactured by Teijin Ltd. (trade name: Conex) is used, and the physical properties of the 1200 denier aramid fiber are shown in Table 1.

Further, in FIG. 3, electrodes 4 consisting of an anode 40 and a cathode 41 are arranged at predetermined intervals in the agate bath 3 whose main ingredient is sulfate, and a conductor roll 5 is arranged between each electrode 4. , the steel strip 6 to be removed is the positive + above! ii 40 and the cathode 4I, and is brought into contact with the conductor roll 5, and the conductor roll 5 also has the main cleaning brush roll 7.
has been contacted.

Table 1 DSC, heating rate 2゛c/min KES pure bending tester (Kato Iron Works) JIS L1
013 Method A Next, the effects will be explained with reference to FIG.

When using the present cleaning brush roll, the present roll 7 is placed in contact with the conductor roll 5, as shown in FIG. 3, and supported by a suitable support (not shown) such as a bearing.

When the steel strip 6 is run in this state, the steel strip 6 passes between the anode 40 and the cathode 41 in the plating bath 3 and comes into contact with the rotating conductor roll 5, causing current to flow between the electrodes 4. When this is done, part of the lightning current flows from the steel strip 6 to the conductor roll 5, thereby controlling the amount of current contributing to plating, and a predetermined amount of zinc ions in the agate bath 3 are uniformly deposited on the surface of the copper strip 6. The steel strip 6 will be coated in this way.

At this time, the cleaning brush roll 7 is rotated in the same direction as the conductor roll 5 by a driving source (not shown), and the deposits on the surface of the conductor roll 5 are removed by the cleaning brush roll 7, and the conductor roll 5 The surface is always kept clean and the agate layer is always kept in a constant shape.

In the cleaning brush roll of this embodiment as described above, fully aromatic boria fiber bristles 2 are implanted on the surface of the roll axis 1, and the surface of the conductor roll 5 is cleaned with these bristles. The completely aromatic polyagodo fiber bristles hardly stain the agate bath as would be the case when using a whetstone of
will not corrode or melt, and the surface of the conductor roll 5 in the steel sheet electric zinc agate line can be guaranteed to be clean, and stable plating formation can be ensured.

Here, the present inventor conducted an experiment to confirm the effect of the present cleaning brush roll. In the experiment, as shown in FIG. 4, a clean brush roll 7 of a predetermined length was attached to the grindstone head of a polishing machine, a conductor roll 5 with Ni attached to its surface was used, and the temperature of the clean brush roll 7 was set at 17°. C, temperature of conductor roll 5 70°C, number of rotations of clean brush roll 7 600rpII1, number of rotations of conductor roll 5 5Orpm, polishing time 2 minutes 30 seconds, cut i0.5m
m, 1.0 mark, 1.5mm, 2.0mm and 2.5
Polish the surface of the conductor roll 5 at each mark to reduce the N on the surface.
We investigated whether or not i could be removed.

As a result of the experiment, the Ni adhering to the surface of the conductor roll 5 was almost completely removed in about 2 minutes, and an extremely smooth surface was obtained. Also, the depth of cut is 1. 5mm~2
, OLIII1 range was optimal. In addition, when the temperature rise of the clean brush roll 7 was investigated, it was found that it ranged from 17°C to 2°C.
A slight increase to 1°C was observed, but no additional cooling water was required.

(Effects of the Invention) As described above, according to the cleaning brush roll for a conductor roll for plate electroplating according to the present invention, wholly aromatic polyamide fiber bristles or abrasives are contained in the outer peripheral surface of the roll shaft core. Fully aromatic polyamide fast fibrous bristles were implanted to extend radially in the radial direction of the axis, thereby cleaning the surface of the conductor roll for controlling the copper plate plating layer in the steel plate electroplating line. This has the effect of reliably preventing a decrease in the surface precision of the plated steel sheet due to roll surface contamination.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 each show an iFi according to an embodiment of the present invention.
A front sectional view and a side sectional view showing a cleaning plan roll of a conductor roll for I-plate electroplating, FIG. 3 is a schematic diagram showing a steel plate electric mening line equipped with the above-mentioned cleaning brush roll, and FIG. 4 is a diagram showing the above-mentioned cleaning brush. It is a figure for explaining the effect of a roll. i--1 roll shaft core, 2--1 fully aromatic polyamide fiber bristles, 5--conductor roll, 7--
Clean brush roll.

Claims (1)

[Claims] (1) A brush roll 7 that cleans the surface of the conductor roll 5 by rotating in contact with the surface of the conductor roll 5 in a steel plate electroplating line equipped with a conductor roll 5 for controlling the steel plate plating layer, the brush roll 7 having a roll axis 1 For electroplating of a steel plate, characterized in that fully aromatic polyamide fiber bristles 2 or wholly aromatic polyamide fiber bristles containing an abrasive are implanted on the outer peripheral surface so as to extend radially in the radial direction of the axis. Conductor roll cleaning brush roll.