JP2000309863A - Cylindrical sliding bearing for molten metal bath - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous hot-dip metal plating of a steel sheet having a ceramic member excellent in erosion resistance and abrasion resistance and having high durability and capable of easily replacing only a metal member. A cylindrical sliding bearing for a roll in bath used in a molten metal bath of a manufacturing facility. SOLUTION: This is a cylindrical sliding bearing of a roll in a bath used in a molten metal bath of a continuous molten metal plating production facility for a steel sheet. A ceramic member (13) disposed in a region directly receiving a load from a roll shaft during use; and a metal retainer (12) disposed on an outer peripheral side for holding the ceramic member. The metal retainer is connected to the ceramic member so as to be easily replaceable, and securely fixes the ceramic member during use of the cylindrical sliding bearing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll bearing, and more particularly, to a roll bearing applied to a metal bath of a facility for continuously plating steel sheets with zinc, aluminum or their alloys.

[0002]

2. Description of the Related Art FIG. 6 shows a configuration of a known continuous molten metal plating apparatus. In this apparatus, a heating furnace (not shown)
The heat-annealed steel sheet 21 is guided to a molten metal tank 22 to plate the steel sheet 21 with molten metal 23,
By pulling up from the molten metal tank 22 via the support roll 25 and the support roll 25, the metal-plated steel plate 26 is continuously obtained. FIG. 7 shows the structure of the sink roll 24. The rotating member 30 of the sink roll bearing 27 is a roll shaft or a cylindrical sleeve fitted on the roll shaft. The fixed-side member 31 has a flat plate or half-cylindrical cylindrical shape, and is held by a retainer 32. FIG. 8 shows the structure of the support roll 25. The rotating member 30 of the support roll bearing 28 is a roll shaft or a cylindrical sleeve fitted on the roll shaft. The fixed-side member 31 has a cylindrical or flat shape and is held by a retainer 32.

FIG. 9 shows a structural example of a fixed side member 31 having a half cylindrical shape. FIG. 10 shows a structural example of the support roll bearing 28. The rotation side member 30 is a roll shaft or a cylindrical sleeve fitted to the roll shaft. The fixed side member 31 has a cylindrical shape and is held by a retainer 32. The sink roll 24 rotates using the movement of the steel plate 21 as power. The rotation of the support roll 25 may be driven by the movement of the steel plate 21 or may be driven by a dedicated motor.

A roll bearing used in a metal bath as described above employs a stainless steel material because of its high temperature and severe erosion environment and required life. In addition, the bearing is a simple sliding bearing due to significant erosion and wear due to a granular alloy generated in a metal bath. By using a sliding bearing, the distance between the roll shaft and the inner surface of the bearing gradually increases due to wear over time, and the roll whirls. In order to reduce the space caused by wear between the roll shaft and the bearing inner surface, three flat plates as shown in FIG. A method of moving one of them in the direction of the center of the roll axis has been adopted.

In recent years, ceramic materials or composite materials which are excellent in wear resistance and erosion resistance have become relatively inexpensive. Since such ceramic materials and composite materials have optimal properties as a roll bearing in the above-described metal bath, application to roll bearings has begun to be attempted.

[0006]

When a ceramic material is used as a bearing, it is combined with an iron-based material constituting another member, and is then rolled in a metal bath by bolting or welding. It is fixed to a frame that supports the bearing. Ceramics and metal materials have significantly different coefficients of thermal expansion, and the bearings used in continuous hot-dip metal plating equipment are repeatedly exposed to high-temperature metal baths and normal temperatures during maintenance. Shrink fit, glue,
Alternatively, when a ceramic material and a metal material are joined by bolting or the like, there has been a problem that the ceramic material is easily damaged.

[0007] Since the ceramic material is excellent in erosion resistance and abrasion resistance, it functions as a bearing for a long time. On the other hand, the metal material to be combined with the metal material is more easily eroded than the ceramic material, so that maintenance of equipment in the bath is required, and the service life is generally much shorter than that of the ceramic material. During maintenance, the equipment in the bath is pulled out of the metal bath and cooled to room temperature, so in this process the uneven side stress generated by the difference in thermal expansion between the ceramic and the metal destroys the ceramic side due to its brittleness There is a risk. The non-uniform stress that causes the destruction of the ceramic also occurs during the cooling process after the molten metal has entered the joint surface between the metal material and the ceramic material. As described above, although ceramics itself is excellent in erosion resistance and wear resistance, the durability of a bearing formed by combining a ceramic material and a metal material is not sufficient.

Although ceramic materials are becoming cheaper, they are much more expensive than bearings made of conventional metal materials such as stainless steel. The investment effect is lost. In order to use up the life of the ceramic member according to the ceramic member, a bearing having a structure that can be reused by taking advantage of the ceramic member during maintenance is desired. However, such bearings have not yet been obtained.

Accordingly, the present invention provides a continuous hot-dip metal plate manufacturing method for a steel sheet having a ceramic member having excellent erosion resistance and abrasion resistance, having high durability and easily replacing only the metal member. It is an object of the present invention to provide a cylindrical sliding bearing for a roll in a bath used in a molten metal bath of a facility.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a cylindrical sliding bearing of a roll in a bath used in a molten metal bath of a continuous molten metal plating manufacturing equipment for steel sheets. A ceramic member disposed in a region directly receiving the load from the roll shaft, and a metal retainer disposed on the outer peripheral side to hold the ceramic member, the metal retainer is easily A cylindrical sliding bearing is provided which is interchangeably connected to the ceramic member and which securely fixes the ceramic member during use of the cylindrical sliding bearing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing a configuration of an example of a cylindrical sliding bearing of the present invention.

The illustrated cylindrical sliding bearing 10 includes a metal fixing device 11 and a metal holding device 12 having a ceramic member 13 in a predetermined area on the inner peripheral side. The ceramic member 13 is provided in a region that receives a load directly from a roll shaft (not shown) during use of the bearing.

In the bearing of the present invention, the ceramic member 13 and the metal cage 12 for holding the ceramic member 13 are not rigidly connected, and the ceramic member 13 is fitted on the inner peripheral side of the metal cage 12. Have been combined by For this reason, non-uniform stress due to thermal expansion or molten metal during the heating or cooling process does not directly act on the ceramic member 13. If the metal cage 12 is eroded by use in a molten metal bath,
The metal cage 12 can be easily removed and replaced. On the other hand, when using the bearing of the present invention in a molten metal bath, the ceramic member 13 is securely fixed by the metal cage 12.

The cylindrical sliding bearing 10 of the present invention is, for example,
As shown in FIG. 2, the metal L-shaped brackets 14a and 14a
By fixing to the roll arm 15 using 4b, the ceramic member 13 and the metal retainer 12 can be fixed. FIG. 2A is a side cross-sectional view of the fixed portion, and FIG.
(B). Note that FIG. 2A corresponds to a II-II cross section in FIG. 2B, and members such as a roll shaft and a roll are not illustrated for simplification.

As shown, a metal L-shaped bracket 14 is provided.
In order to fix the cylindrical sliding bearing 10 of the present invention by using the a and b, a predetermined region on the outer periphery of the metal fixing device 11 and the metal holding device 13 is fixed to the metal L-shaped bracket 1.
It is preferable to process it into a predetermined shape corresponding to the shapes of 4a and 14b. Note that the L-shaped bracket is SU
It can be made of any metal material such as S316L, SCS22, etc., and its size can be appropriately determined according to the size of the bearing and the like.

FIG. 3 shows the structure of the metal cage 12 having the ceramic member 13 on the inner peripheral side of the cylindrical sliding bearing 10 of the present invention fixed by the metal L-shaped bracket 14b as shown in FIG. Show.

FIG. 3A is a front view of the metal cage 12 having the ceramic member 13, and FIG. 3B is a sectional view taken along the line III-III in FIG. As shown in FIG. 3A, a predetermined groove is provided on the inner periphery of the metal cage 12, and the ceramic member 13 is fitted in the groove. Further, as shown in FIG. 3B, a predetermined region on the outer periphery of the metal cage 12 is processed so as to correspond to the shape of the metal L-shaped bracket 14b described in FIG. 2A. It has been subjected.

The metal cage 12 is made of SUS316L, S
The ceramic member 13 can be made of ceramics such as titanium diboride, silicon nitride, and alumina.

In the present invention, the inner dimensions of the metal cage 12, that is, the portion that comes into contact with the ceramic member 13,
By forming the ceramic member 13 larger by a predetermined dimension than the outer dimension of the ceramic member 13, the metal retainer 12 and the ceramic member 13 can be fitted. Specifically, the inner dimension of the metal cage 12 is formed to be larger than the outer dimension of the ceramic member 13 by about 0.01 to 0.8 mm. It is difficult to process these members with a difference of less than 0.01 mm, while if it exceeds 0.8 mm, the gap becomes large, which causes inconvenience that vibrations and breakage of ceramics are likely to occur. Other dimensions of each member, such as the outer dimensions and width of the metal cage 12,
Other dimensions such as the inner dimension and width of the ceramic member 13 can be appropriately determined.

The shape of the groove on the inner periphery of the metal cage 12 is not particularly limited as long as the shape of the ceramic member 13 can be restricted by the load acting in the thrust direction with respect to the roll axis (not shown). Alternatively, it may be a structure in which machined or subdivided members are joined by welding.

Metal cage 12 and ceramic member 13
A commercially available coating-type ceramic coating agent may be applied to the boundary between. Examples of usable ceramic coating agents include boron nitride-based and alumina-based liquid coating agents. By applying such a coating agent, the ceramic member 13 is easily peeled at the time of disassembling the bearing, so that the ceramic member can be prevented from being broken.

Since the cylindrical sliding bearing of the present invention is constructed in combination with the metal fixing device 11, it is necessary that the end 12a of the metal retainer does not protrude from the end 13a of the ceramic member.

In the illustrated example, the shape of the ceramic member 13 is a half cylindrical shape, but it is not limited to this. The ceramic member 13 can be arranged on the inner periphery of the metal retainer 12 so as to cover an arbitrary region that receives a load directly from the roll shaft during use of the bearing. However, it is most preferable that the ceramic member 13 be a half-cylindrical cylinder in terms of engineering for assembling the bearing.

FIG. 4 shows the structure of the metal fixing device 11 in the cylindrical sliding bearing 10 of the present invention, which is fixed by the metal L-shaped bracket 14a as shown in FIG.

FIG. 4A is a front view of the metal cage 11, and FIG. 4B is a cross-sectional view taken along line IV-IV in FIG. 4A. As shown in FIG. 4B, the metal fixing device 1
A predetermined region on the outer periphery of the first member 1 is processed so as to correspond to the shape of the metal L-shaped bracket 14a described with reference to FIG. The metal fixing device 11 can be made of an arbitrary metal material such as SUS316L and SCS22 in the same manner as the metal holding device 12.

In the present invention, the metal fixing device 11 includes:
Since the bearing is configured in combination with the metal retainer 12 having the ceramic member 13, the outer diameter of the metal retainer 11 is formed substantially equal to the outer diameter of the metal retainer 12, and the inner diameter of the retainer is It is desired that the inner diameter of the ceramic member 13 is substantially equal to that of the ceramic member 13.

By combining such a metal fixing device 11 and a metal holding device 12 having a ceramic member 13 on the inner peripheral side as shown in FIG. 3, the cylindrical sliding bearing 10 of the present invention as shown in FIG. Is configured. The cylindrical bearing is fixed to a roll arm that fixes a roll or a bearing by arranging a ceramic member on the side where a load is applied from the roll shaft as shown in FIG.

In the cylindrical sliding bearing of the present invention, the outer shape of the metal cage 12 and the metal fixing device 11 does not need to be circular, but may be polygonal or polygonal so as to be easily fixed to a frame for fixing the bearing. It may be odd.

Further, a commercially available ceramic coating agent may be applied to the outside of the metal retainer 12 and the fixing device 11. Examples of the coating agent include those described above. By applying the coating agent, it is possible to reduce the erosion of the metal portion of the bearing against the molten metal, and it is possible to extend the life of the bearing itself.

[0031]

Now, the present invention will be described in further detail with reference to specific examples.

First, a half-cylindrical ceramic member was formed using TiB ₂ as the ceramic. This T
It prepared iB ₂ member semi-cylindrical shaped stainless steel cage with dimensions covering the outer periphery of, engraved a 0.5mm larger groove than the outer dimensions of the TiB ₂ members in the inner peripheral portion of the retainer. A predetermined region on the outer periphery of the cage is processed as shown in FIG.

A member as shown in FIG. 3 was prepared by fitting a TiB ₂ member into a stainless steel cage. At this time, the end of the cage did not protrude from the end of the TiB ₂ member, and was on the same plane.

Further, a stainless steel fixing device having a half cylindrical shape as shown in FIG. 4 was prepared. The inner diameter of the fixing device is equal to the inner diameter of the above-mentioned TiB ₂ member, the outer diameter of the fixing device is equal to the outer diameter of the retainer, and a predetermined region on the outer periphery is shown in FIG.
Processing is performed as shown in FIG.

The stainless steel fixing device and the aforementioned Ti
To prepare a cylindrical sliding bearing of the present invention in combination with a stainless steel cage with a B ₂ member was fixed to the roll arm further used a metal L-shaped brackets as shown in FIG.

The relationship between the sliding distance and the wear amount of the obtained cylindrical sliding bearing was examined, and the results are shown in the graph of FIG. The results for bearings made of a conventional iron-based metal material are also shown.

As shown in the graph of FIG. 5, the conventional bearing made of an iron-based metal material has reached a wear amount of 10 mm or more at a sliding distance of about 2 × 10 ⁶ m, whereas the present invention has The wear amount of the cylindrical sliding bearing is 0.1 mm or less even at a sliding distance of 2 × 10 ⁶ m. The relationship between the sliding distance and the amount of wear was the same for cylindrical sliding bearings produced in the same manner as described above except that the ceramics were changed to silicon nitride or alumina-based ceramics.

Since the wear amount of the bearing is thus reduced, it is easily presumed that the quality of the steel sheet after plating is improved by using the bearing of the present invention in a molten metal plating bath.

[0039]

As described above, according to the present invention, a ceramic member having excellent erosion resistance and abrasion resistance is provided, has high durability, and only the metal member can be easily replaced. A cylindrical sliding bearing for a roll in a bath for use in a molten metal bath of a continuous hot metal plating manufacturing equipment for steel sheets is provided.

According to the present invention, a roll driven in a non-driven, stable speed of a steel sheet is used for a roll used in a molten metal bath of a facility for continuously hot-dip coating zinc, aluminum or an alloy thereof on a steel sheet. Is obtained. Therefore, the vibration of the steel sheet around the molten metal bath can be reduced, and the life of the roll bearing can be extended by using the ceramic member, so that the quality of the steel sheet after plating is remarkably improved. I do. In addition, since only the metal member can be easily replaced, in the cylindrical sliding bearing of the present invention, the expensive ceramic member can be used repeatedly until the performance cannot be maintained. Therefore, the manufacturing cost can be greatly reduced, and the industrial value of the present invention is great.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of an example of a cylindrical sliding bearing of the present invention.

FIG. 2 is a schematic view illustrating a method of fixing a cylindrical sliding bearing according to the present invention.

FIG. 3 is a schematic diagram showing a configuration of a cylindrical slide bearing of the present invention on a metal cage side.

FIG. 4 is a schematic diagram showing a configuration of a metal fixing device in the cylindrical sliding bearing of the present invention.

FIG. 5 is a graph showing a relationship between a sliding distance of a cylindrical sliding bearing and an amount of wear.

FIG. 6 is a diagram showing a configuration of a continuous molten metal plating apparatus.

FIG. 7 is a view showing the structure of a sink roll.

FIG. 8 is a diagram showing a structure of a support roll.

FIG. 9 is a diagram showing a structural example of a sink roll bearing.

FIG. 10 is a diagram showing a structural example of a support roll bearing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Cylindrical sliding bearing 11 ... Metal fixer 12 ... Metal retainer 12a ... Metal retainer end 13 ... Ceramic member 13a ... Ceramic member end 14a, 14b ... Metal L-shaped bracket 15 ... Roll arm 21 ... Steel plate 22 ... Molten metal tank 23 ... Molten metal 24 ... Sink roll 25 ... Support roll 26 ... Metal plated steel plate 27 ... Sink roll bearing 28 ... Support roll bearing 30 ... Rotating member 31 ... Fixed side member 32 ... Retainer

Claims (1)

[Claims] 1. A cylindrical sliding bearing of a roll in a bath used in a molten metal bath of a continuous molten metal plating manufacturing equipment for a steel sheet, comprising: a ceramic member disposed in a region directly receiving a load from a roll shaft during use; A metal cage disposed on the outer peripheral side to hold the ceramic member, wherein the metal cage is connected to the ceramic member so as to be easily replaceable, and the cylindrical sliding bearing is provided. A cylindrical sliding bearing for securely fixing the ceramic member during use.