JPH11246955A - Sink roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sink roll which reduces the sticking amount of dross and has good erosion resistance and whose outer peripheral surface is hardly damaged, by constituting at least the outer peripheral surface of the sink roll with carbonaceous carbon. SOLUTION: The sink roll body 1 is formed into a cylinder shape by using the carbonaceous carbon. A fixed metallic core rod 2 is inserted into the hollow part of the sink roll body 1. The surface of bearing 3 formed on the inner surface or a part of the inner surface of the sink roll body 1 and the outer surface or a part of the outer surface of the metallic core rod 2, and used as a sliding surface, and the sink roll body 1 is made in a rotatable state. The bearing 3 can be formed of the same carbonaceous carbon as the sink roll body 1, or can be formed of carbon having more excellent sliding characteristic. In this way, since the outer peripheral surface of the sink roll does not react with the metal in plating bath, the erosion resistance thereof is good and the sticking of dross can be prevented or the amount can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sink roll suitable for use in a hot-dip metal plating bath, and more particularly, to a sink roll having less dross adhesion, good corrosion resistance, and a scratch-resistant outer peripheral surface. The present invention relates to a sink roll having a long continuous usable time without transferring the groove pattern of the sink roll to the surface of the hot-dip strip.

[0002]

2. Description of the Related Art Conventionally, as a sink roll used in a hot dip galvanizing bath, for example, in a hot dip galvanizing bath, JP-B-52-22934 and JP-A-53-12853 are known.
No. 8, JP-A-54-112236, and the like, which are obtained by spraying a material having corrosion resistance on the surface of an iron roll, JP-A-47-33728, and JP-B-58-37386. As disclosed in, for example, Japanese Utility Model Application Laid-Open No. 57-74978, an iron roll having a ceramic coating on its surface is known.

[0003] Further, as disclosed in Japanese Patent No. 2657580 and the like, a carbon base material surface is coated with a ceramic coating, and as disclosed in Japanese Patent No. 2617154 and the like, a base material made of graphite is used. Having an anticorrosion layer formed on the outermost peripheral surface thereof, as disclosed in Japanese Patent Application Laid-Open No. 8-41616, etc., has excellent non-wetting properties with molten metal (that is, poor wettability with molten metal). There is known a graphite roll which is directed to a sink roll having at least an outer peripheral surface formed of graphite carbon.

[0004]

The characteristics required for a sink roll used in a hot-dip metal plating bath include not only the function as a sink roll, but also a low dross adhesion, a good corrosion resistance, and a good scratch resistance. , The groove pattern of the sink roll is not transferred to the surface of the hot-dip strip, and the continuous usable time is long.

For example, many hot dip galvanizing baths usually consist of Zn, an appropriate amount of Al, and Fe eluted from the strip. Therefore, as a characteristic required for the sink roll used in the hot-dip galvanizing bath, not only does it function as a sink roll, but dross generated by the reaction of Fe with Zn and / or Al is generated on the sink roll surface, No adhesion, Zn,
There is no corrosion by Al, it is hard to be damaged, the groove pattern of the sink roll is not transferred to the surface of the hot-dip strip, and the continuous usable time is long.

[0006] However, there has hitherto not been a sink roll satisfying all these requirements. In the case where a corrosion-resistant substance is sprayed on the surface of the iron sink roll, the layer formed by the spray becomes porous, Zn enters through the pores, and the iron sink roll of the base material is eroded. Some of the pores are sealed, but Zn,
Nothing is not corroded by Al and does not react with Zn, Al, and Fe. Ceramic products have limited dimensions that can be manufactured, and it is not possible to manufacture the entire sink roll from ceramic. In the case where a ceramic coating is applied to the surface of the iron sink roll by thermal spraying, the same problems as in the case of thermal spraying described above remain.

In a sink roll using graphitic carbon, the edge of the strip comes into contact with the sink roll when the strip is subjected to tension, and the surface of the sink roll is scratched, or the pressure from the strip causes the sink roll to break. There was a problem of hardness and strength. Further, there is a problem that the groove pattern of the sink roll is transferred to the surface of the hot-dip strip. Examination of the cause of the transfer of the groove pattern revealed that graphite carbon had poor wettability with molten zinc, and the strip contacted the groove of the sink roll directly to repel the molten zinc on the outer peripheral surface of the sink roll. It was found that a pattern occurred. As a countermeasure, it is conceivable to use a material having good wettability with molten zinc.

The present invention solves these problems,
That is, the present invention provides a sink roll that has less dross adhesion, good corrosion resistance, and has an outer peripheral surface that is not easily scratched, does not generate a groove pattern on the surface of a hot-dip strip, and has a long continuous usable time. That is the task. The present invention preferably functions not only as a sink roll, but also because dross generated by the reaction of Fe with Zn and / or Al does not form or adhere to the sink roll surface. Has an outer peripheral surface that is not corroded and is not easily scratched, and has good wettability with hot-dip zinc, so that the groove pattern of the sink roll is not transferred to the surface of the hot-dip galvanized strip, allowing continuous use. Is to provide a long sink roll.

[0009]

Means for Solving the Problems The present inventors have made intensive studies to achieve the above object, and as a result, the above object has been achieved by forming at least the outer peripheral surface of the sink roll with carbonaceous carbon. And completed the present invention. That is, the sink roll of the present invention is a sink roll suitable for use in a hot-dip metal plating bath, wherein at least the outer peripheral surface of the sink roll is made of carbonaceous carbon.

[0010] In one embodiment of the sink roll of the present invention, at least the outer peripheral surface of the sink roll is made of carbonaceous carbon, the sink roll is cylindrical, and the fixed core rod is fixed to the sink roll. The cylindrical sink roll is disposed in the hollow of the cylindrical sink roll, and the cylindrical sink roll rotates with the inner surface or a part of the inner surface of the cylindrical sink roll and the outer surface or a part of the outer surface of the core rod as sliding surfaces. It is characterized by being able to.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The hot-dip metal plating bath in the present invention includes a hot-dip Zn plating bath, a hot-dip Al plating bath,
n-Al alloy plating bath, hot-dip Sn plating bath, hot-dip Sn-
Pb alloy plating baths and the like can be mentioned, and a preferred hot-dip metal plating bath is a hot-dip galvanizing bath.

[0012] Carbon materials are conventionally distinguished between carbonaceous and graphitic for convenience. Carbonaceous carbon is also called amorphous or amorphous carbon.
Heat-treated at Carbonaceous carbon has a higher hardness than graphite carbon, usually has a Shore hardness of about 70, has excellent strength, and has the necessary hardness and strength as a sink roll. The carbonaceous carbon is Z
It has low reactivity with n, Al, and Fe, and has good corrosion resistance.
Furthermore, graphite carbon has poor wettability with molten metal,
Carbonaceous carbon has extremely good wettability with molten metal and molten zinc. In the present invention, at least the outer peripheral surface of the sink roll is formed using such carbonaceous carbon.

In one embodiment of the sink roll of the present invention, in order to prevent breakage of the sink roll, the sink roll is cylindrical, and a fixed core rod is disposed in the hollow of the cylindrical sink roll. It is preferable that the cylindrical sink roll be rotatable with the inner surface or a part of the inner surface of the cylindrical sink roll and the outer surface or a part of the outer surface of the core rod as sliding surfaces.

This state will be described with reference to the drawings. FIG.
FIG. 2 is a schematic sectional view of an embodiment of the sink roll of the present invention, and FIG. 2 is a sectional view taken along line II of FIG. 1 and 2
In the sink roll shown in (1), the sink roll body 1 is formed in a cylindrical shape using carbonaceous carbon. The fixed metal core rod 2 is attached to the cylindrical sink roll body 1.
Is arranged in the hollow. Cylindrical sink roll body 1
1 and 2, the surface of the bearing 3 formed on a part of the inner surface, and the outer surface of the metal core rod 2 or FIG.
As shown in FIG. 2 and FIG. 2, the cylindrical sink roll body 1 can be rotated with a part of the outer surface as a sliding surface.

The bearing 3 formed on a part of the inner surface may be made of the same carbonaceous carbon as the sink roll body 1 or may be made of carbon which has better sliding characteristics than the carbonaceous carbon of the sink roll body 1. May be formed. Of course, when the bearing 3 is the same carbonaceous carbon as the sink roll body 1, it is not necessary to form it as a separate part.

A strip 4 is stretched around the above-mentioned sink roll. In this state, the tension of the strip 4 and the buoyancy of the sink roll body 1 in the molten metal plating bath are
Supported by. As the strip 4 is transported, the sink roll body 1 rotates with the surface of the bearing 3 formed on a part of the inner surface of the sink roll body 1 and a part of the outer surface of the metal core rod 2 as sliding surfaces, The transfer of the strip 4 becomes smooth.

In the sink roll of the present invention, since at least the outer peripheral surface of the sink roll is made of carbonaceous carbon, it does not react with Zn, Al, and Fe, so that it has good corrosion resistance, (Fe, Z
(alloys such as n and Al) adhere to the surface of the sink roll, which can be prevented or reduced.

Further, in the sink roll of the present invention,
Since the carbonaceous carbon constituting at least the outer peripheral surface of the sink roll is hard with a Shore hardness of about 70, there is a risk that the strip is stretched on the sink roll and the sink roll rotates with the applied tension of the strip. A scratch on the surface of a certain sink roll can be prevented.

Further, since carbonaceous carbon has good wettability with molten metal, Zn is uniformly attached to the surface of the sink roll, and the groove pattern is not transferred to the strip. In the embodiment of the sink roll of the present invention shown in FIGS. 1 and 2, the sink roll is provided on a metal core rod penetrating through the hollow of the sink roll, and the load such as the tension of the strip and the buoyancy of the sink roll main body is applied. Since the structure is such that the metal core bar bears the stress, the stress (particularly, bending stress) generated in the sink roll can be reduced, and breakage of the sink roll can be prevented. By setting the sink roll as described above, the continuous usable time becomes twice or more as compared with the conventional case.

[0020]

The sink roll of the present invention has very little dross adhesion, good corrosion resistance, no scratches on the sink roll surface, and the groove pattern of the sink roll is transferred to the hot-dip strip surface. Absent. When the sink roll is cylindrical and the fixed metal core rod is arranged in the hollow of the cylindrical sink roll, there is no problem in strength and continuous use in the bath is It has become possible to double or more. Further, since the amount of dross adhering to the sink roll is reduced, there is also an effect that dross adhering to the product steel plate and causing defects can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an example of a sink roll of the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sink roll main body 2 Metal core rod 3 Bearing 4 Strip

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Okamoto remodeling 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Pref. Chome (without address) Kawasaki Steel Corporation Mizushima Works (72) Inventor Masahiko Tada 1 Kawasaki-cho, Chuo-ku, Chiba City, Chiba Prefecture Kawasaki Steel Corporation Research Institute (72) Inventor Atsushi Yamaji Kanagawa, Yokohama, Kanagawa Prefecture 1-1, Shinurashima-cho, Nippon Carbon Co., Ltd.

Claims (3)

[Claims] 1. A sink roll suitable for use in a hot-dip metal plating bath, wherein at least the outer peripheral surface of the sink roll is made of carbonaceous carbon. 2. The sink roll is cylindrical, and a fixed core rod is disposed in the hollow of the cylindrical sink roll, and the inner surface or a part of the inner surface of the cylindrical sink roll and the core rod are provided. The sink roll according to claim 1, wherein the cylindrical sink roll can rotate with an outer surface or a part of the outer surface as a sliding surface. 3. The sink roll according to claim 1, wherein the hot dip galvanizing bath is a hot dip galvanizing bath.