JP2000291645A - Sliding structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding structure having the corrosion resistance, the heat resistance and the thermal impact resistance, in particular, high temperature abrasion resistance, and capable of executing the stable and smooth sliding, and a sliding structure free from the idle running of a sliding ring and a shaft body, and the fracture of the sliding ring even when the thermal expansion coefficient of the sliding ring and the shaft body are different from one another. SOLUTION: In a sliding structure having a bearing 51, and a shaft 41 relatively rotating in a shaft hole formed on the bearing 51, the shaft 41 is formed by a shaft body 43 having a groove 42 in the circumferential direction, and a sliding ring 4 fitted in the groove 42, the sliding ring 44 is made of a material having the thermal expansion coefficient different from that of the shaft body 43, and circumferentially divided into 3-8 pieces 45, and the cross sectional shape cut at a plane including the rotary shaft, of the sliding ring 44 and the groove 42 is trapezoid of the approximately same size where the outer peripheral side of the shaft 41 is an upper bottom. In the sliding structure used in the metal molten bath, at least its sliding part is made of a Si-SiC composite material or a SiC composite material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding structure used in a molten metal, particularly to a roll device installed in a molten metal plating device.

[0002]

2. Description of the Related Art A sliding structure refers to a structure that achieves a specific purpose while sliding with each other, such as a bearing and a shaft installed in a shaft hole provided in the bearing. As the sliding structure used in the molten metal, for example,
A sink roll device, a support roll device, and the like installed in a molten metal plating device are exemplified.

Accordingly, a sink roll device and a support roll device as examples of a sliding structure used in a molten metal will be described with reference to a schematic diagram of a molten metal plating device shown in FIG. The molten metal plating apparatus 21 is used in a state of being immersed in a plating tank 23 filled with a molten metal 22, and generally includes a sink roll apparatus 24, a support roll apparatus 25, and a wiping nozzle 26.

The sink roll device 24 includes a sink roll 27, a shaft 28 provided integrally with the sink roll 27, and a bearing (not shown). The shaft 28 is provided on the bearing while sliding with the bearing. Rotate in the shaft hole. The support roll device 25 is composed of two support rolls 29, a shaft 30 and a bearing (not shown) provided integrally with the support roll 29, and the shaft 30 slides on the bearing and is attached to the bearing. It rotates in the provided shaft hole.

[0005] In the plating step, the steel strip 31 supplied from obliquely above the plating tank 23 is turned upward by the sink roll device 24, and the run-out is suppressed by the support roll device 25. Further, the plating thickness of the steel strip 31 is adjusted by the high-speed gas, which is blown out of the wiping nozzle 26 and whose gas pressure and blowing angle are adjusted.

[0006] The temperature of the molten metal is, for example, about 500 ° C for zinc and about 750 ° C for aluminum.
It is necessary to use one having excellent corrosion resistance, heat resistance, thermal shock resistance, and high-temperature wear resistance. In particular, in the case of a sink roll device and a support roll device installed in a molten metal plating device, if the sliding portion of the shaft or the bearing is worn or corroded, the roll or the molten metal plating device vibrates, so that the plating thickness varies. Will occur. Therefore, corrosion-resistant heat-resistant alloys such as SCH13 and ceramics such as Sialon have been used for sliding portions of sliding structures such as sink roll devices and support roll devices. Specifically, for example, as shown in FIG. 6, the shafts of the sink roll 27 and the support roll 29 are composed of a shaft main body 33 and a slide ring 34 made of the above-mentioned corrosion-resistant and heat-resistant alloy. A layer 32 made of Sialon was provided in 40. It should be noted that the use of the slide ring 34 without forming the entirety of the sink roll 27 and the support roll 29 from the above-described material is a cost of the plating work because the entire roll device is replaced every time the sliding portion is worn. Is increased.

[0007]

However, even when the sliding portion of the sliding structure is made of the above-mentioned corrosion-resistant and heat-resistant alloy, when used in a molten metal, the sliding portion has a high wear rate. In the case of the above-mentioned sliding ring, it has to be exchanged for a new one in about one week, which causes an increase in the cost of the plating operation.

Further, when the sliding ring is made of ceramics such as sialon, the sliding ring is often broken or damaged during handling or when subjected to a thermal shock. Further, a sliding ring 34 constituting the shafts 28 and 30
Since the material of the shaft body 33 and the material of the shaft body 33 are different, the two have different thermal expansion coefficients. Since the thermal expansion coefficient of the shaft body 33 is larger than the thermal expansion coefficient of the sliding ring 34, the sliding ring 3
4 was damaged.

[0009] The present invention has been made in view of such circumstances, and aims at corrosion resistance, heat resistance, and the like.
In addition to having thermal shock resistance, it has particularly excellent high-temperature wear resistance and can perform stable and smooth sliding, even if the thermal expansion coefficient between the sliding ring and the shaft body is different. Another object of the present invention is to provide a sliding structure in which the sliding ring and the shaft main body do not spin or the sliding ring is not damaged.

[0010]

That is, according to the present invention, there is provided a sliding structure having a bearing and a shaft which relatively rotates in a shaft hole provided in the bearing, wherein the shaft comprises: It consists of a shaft body having a groove in the circumferential direction, and a sliding ring fitted in the groove. The sliding ring is made of a material having a different coefficient of thermal expansion from the shaft body and has a circumferential direction. The sliding ring and the groove are divided into three or more and eight or less pieces, and the cross-sectional shape when the sliding ring and the groove are cut along a plane including the rotating shaft is a trapezoid having substantially the same size with the outer peripheral side of the shaft being the upper bottom. A sliding structure is provided. In the above-described sliding structure, it is preferable that the divided surface of the sliding ring intersects only with the rotation axis at one point. The trapezoid has a base angle of 30 °.
As mentioned above, it is preferable that it is 80 degrees or less. Further, in the sliding structure, at least one of the trajectories of the cross-sectional shape when the sliding ring is cut along a plane including the rotation axis is the trajectory of the cross-sectional shape when cut along another plane including the rotation shaft. Preferably, it is different.

Further, according to the present invention, there is provided a sliding structure having a bearing and a shaft relatively rotating in a shaft hole provided in the bearing, wherein the shaft has a groove in a circumferential direction. A shaft body and a sliding ring fitted in the groove, the sliding ring is made of a material having a different thermal expansion coefficient from the shaft body, and the sliding ring is a plane including a rotating shaft. A sliding structure is provided in which at least one of the trajectories of the cross-sectional shape when cut is different from the trajectory of the cross-sectional shape when cut along another plane including the rotation axis.

In the above or the above sliding structure, the sliding ring and the inner wall of the shaft hole are made of a Si—SiC-based composite material or S
It is preferable to be made of an iC-based composite material.

Further, according to the present invention, there is provided a sliding structure used in a molten metal, wherein at least the sliding portion is made of a Si—SiC composite material or a SiC composite material. Is done. The above-mentioned sliding structure may have a bearing and a shaft which relatively rotates in a shaft hole provided in the bearing.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The first sliding structure of the present invention is:
As shown in FIG. 1, a bearing 51 and a shaft 41 that relatively rotates in a shaft hole 40 provided in the bearing 51 are provided.
1 is a shaft body 43 having a groove 42 in the circumferential direction;
The sliding ring 44 is made of a material having a different thermal expansion coefficient from that of the shaft main body 43, and has three or more circumferential members 7 in its circumferential direction.
The sliding ring 44 and the groove 42 are divided into the following pieces 45, and the cross-sectional shape when the sliding ring 44 and the groove 42 are cut along a plane including the rotating shaft 46 has a trapezoidal shape of substantially the same size with the outer peripheral side of the shaft 41 as the upper bottom. It is.

The reason why the sliding ring 44 is divided in the circumferential direction is that the material constituting the sliding ring 44 has a thermal expansion coefficient of
This is to prevent the sliding ring 44 from being damaged even when the material constituting the shaft main body 43 is smaller than the coefficient of thermal expansion. Note that the division into three or more and seven or less pieces 45 is not possible because the splitting of the sliding ring 44 cannot be completely prevented by two divisions. This is because work becomes complicated and work efficiency is reduced.

Further, a groove 42 running in the circumferential direction is provided on the shaft 41, a sliding ring 44 is fitted into the groove, and the sliding ring 44 and the groove 42 are cut along a plane including the rotation shaft 46. The outer peripheral side of the shaft 41 is the upper bottom,
The reason why the trapezoids have almost the same dimensions is that when the shaft 41 rotates,
This is to prevent each piece constituting the sliding ring 44 from separating from the groove due to centrifugal force. "The trapezoid of substantially the same size" means that the distance between the sliding ring and the wall of the groove 42 is 0.1 to 0.5 m.
This means that a clearance of about m is provided.

The size of the base angle of the trapezoid is determined by the relationship with the thickness of the sliding ring 44, but is generally 30 degrees.
It is preferable that it is more than 45 degrees and less than 80 degrees, and it is more preferable that it is more than 45 degrees and less than 60 degrees. If the angle is less than 30 °, the thickness of the peripheral portion of the sliding ring 44 becomes too small, so that the sliding ring 44 is easily damaged.
It is because it becomes easy to be separated from.

In the above sliding structure, it is preferable that the divided surface 53 of the sliding ring intersects only with the rotation shaft 46 at one point 54 as shown in FIG. By doing so, the dividing line 47 on the outer peripheral surface of the sliding ring 44 is oriented obliquely with respect to the rotation direction of the sliding ring 44, so that the impact due to the step between the pieces 45 constituting the sliding ring 44 is reduced. This is because it can be reduced and smooth sliding can be performed.

The “shaft that rotates relatively in the shaft hole” means not only the case where the shaft 41 itself rotates in the shaft hole 40 but also the case where the shaft 41 is stationary and the shaft hole 40 rotates. It is intended to include cases.

The second sliding structure of the present invention is shown in FIG.
As shown in FIG. 3, a bearing 51 having a shaft hole 40 (FIG. 3)
Not shown in (a) and (c). ), A shaft 41 that relatively rotates in the shaft hole 40, and the shaft 41 is composed of a shaft body 43 having a groove 42 in a circumferential direction and a sliding ring 44 fitted in the groove 42. The sliding ring 44 is made of a material having a different coefficient of thermal expansion from that of the shaft main body 43, and has a locus 48a of a cross-sectional shape when the sliding ring 44 is cut along a plane including the rotating shaft 46. At least one is configured to be different from the locus 48a of the cross-sectional shape when cut along another plane including the rotation shaft 46.

With such a configuration, the coefficient of thermal expansion of the material forming the sliding ring 44 is
Can be prevented from running idle even when the coefficient of thermal expansion is larger than that of the material constituting the sliding member 44, and the sliding ring 44 always follows the shaft 41 and rotates.

As a specific mode of such a sliding structure, as shown in FIGS. 3A and 3B, when a part of the sliding ring 44 is projected in the longitudinal direction of the shaft 41, That is, although most of the cross-sectional shape when the sliding ring 44 is cut along a plane including the rotation shaft 46 has the same locus 48b, a part of the cross-sectional shape has a locus 48a different from most other cross-sectional shapes. There is a case of drawing. However, a more preferable embodiment is as shown in FIG.
In this case, a plane 56 that closes at least one of the openings 4 and a plane 55 that is perpendicular to the rotation axis 46 are obliquely oriented. In this case, it is preferable that the angle formed between the plane 56 closing at least one of the openings of the sliding ring 44 and the plane 55 perpendicular to the rotation axis is 5 to 50 °.

Further, the third sliding structure of the present invention is used in a molten metal, and at least its sliding part is S
It is composed of an i-SiC-based composite material or a SiC-based composite material. The sliding structure is made of Si-SiC composite material or SiC
By using a composite material, sufficient heat resistance, thermal shock resistance, and abrasion resistance can be imparted to the sliding structure, and the life of the sliding structure can be extended to reduce the cost of plating work. And smoother sliding can be performed, so that the vibration of the molten metal plating equipment caused by the abrasion of the sliding structure can be prevented and the quality of the plated product does not vary. it can.

That is, a Si—SiC-based composite material and Si
As shown in Table 1, the C-based composite material has the same heat resistance and thermal shock resistance as the conventionally used corrosion-resistant and heat-resistant alloys such as SCH13 and ceramics such as Sialon, and has a superior wear resistance. Because of the abrasion properties, the sliding structure can be provided with the above characteristics.

[0025]

[Table 1]

In Table 1, the heat resistance values are the values described in the catalog of each member.

The value of thermal shock resistance is 1 with a heater.
Test piece heated to 500 ° C (100 mm x 50 mm x
5 mm) was put in water, and it was measured by observing whether or not it cracked.

Further, the value of the abrasion resistance is as follows:
A ring made of CH13 was placed in a molten aluminum for 20 minutes.
Rotating at 0 rpm, the plate-shaped test piece was
It was measured by examining the amount of abrasion when a line contact of 50 mm length was brought into contact with a load of 50 kg.

In the present invention, “Si—SiC composite material” refers to a basic skeleton composed of a C / C composite as S
A material having a configuration surrounding a matrix made of an i-SiC-based material.

More specifically, “Si—SiC-based composite material” refers to 55% to 75% by weight of carbon, 1% to 10% by weight of silicon, and 10% to 50% by weight of A yarn set composed of silicon carbide, and yarns containing at least a bundle of carbon fibers and a carbon component other than carbon fibers are three-dimensionally combined while being oriented in the layer direction and are integrated so as not to be separated from each other. Body and Si-S filled between the adjacent yarns in the yarn assembly
a matrix made of an iC-based material,
A composite material having a dynamic friction coefficient of 0.6 and a controlled porosity of 0.5% to 10%.

Here, “C / C composite” means
A preformed yarn, which is a flexible intermediate material, obtained by forming a flexible film made of a plastic such as a thermoplastic resin around a carbon fiber bundle is prepared by the method described in JP-A-2-80639. And a molded body obtained by laminating a required amount and then molding by hot pressing, or a fired body obtained by firing this molded body. Note that the carbon fiber bundle is a powdery binder that acts as a matrix of the carbon fiber bundle, and includes a pitch and coke that become free carbon with respect to the carbon fiber bundle after firing. It is prepared by incorporating phenol resin powder and the like.

The C / C composite used as the basic skeleton of the Si—SiC-based composite material has a diameter of 10
Fiber bundles (yarns) formed by bundling several hundreds to tens of thousands of carbon fibers having a size of about μm are coated with a thermoplastic resin to form a flexible thread-like intermediate material, which is disclosed in Japanese Patent Application Laid-Open No. 2-80639. A sheet formed by the described method is arranged in a two-dimensional or three-dimensional direction to form a one-way sheet (UD sheet) or various cloths, or by laminating the sheets or cloths, a preparatory sheet having a predetermined shape is prepared. A molded body (fiber preform) is used, and a carbonized and removed film of a thermoplastic resin or the like formed of an organic substance formed on the outer periphery of the fiber bundle of the preformed body is used.

In this specification, the description of Japanese Patent Application Laid-Open No. 2-80639 is cited for reference. In the C / C composite used in the present invention, the carbon component other than the carbon fiber in the yarn is preferably a carbon powder, particularly preferably a graphitized carbon powder.

The “Si—SiC-based material” refers to a material containing several different phases from a silicon phase remaining in an unreacted state to almost pure silicon carbide, Typically consists of a silicon phase and a silicon carbide phase,
The silicon carbide phase may include a SiC coexisting phase in which the content of silicon changes in a gradient. Therefore, the Si-SiC-based material is a generic term for materials that are contained in the Si-SiC series within a range of 0 mol% to 50 mol% as the concentration of carbon.

The “Si—SiC-based composite material” used in the present invention preferably has a matrix having a gradient composition in which the silicon content increases as the distance from the yarn surface increases. In the "Si-SiC-based composite material" used in the present invention, the basic skeleton composed of the C / C composite is composed of a yarn aggregate formed by laminating a plurality of yarn arrays composed of carbon fibers in a specific direction. It is preferable that each yarn array is a two-dimensional array of yarns each formed by bundling a specific number of carbon fibers.

FIG. 7 shows an example of the “Si—SiC composite material”. 8A is a sectional view taken along line IIa-IIa in FIG. 7, and FIG. 8B is a sectional view taken along line IIb-IIb in FIG. The skeleton of the Si—SiC-based composite material 7 is constituted by the yarn aggregate 6. The yarn aggregate 6 is formed by vertically stacking the yarn arrays 1A, 1B, 1C, 1D, 1E, and 1F. In each yarn array, the yarns 3 are two-dimensionally arranged so as to be parallel to each other. The longitudinal direction of each yarn in each vertically arranged yarn array is orthogonal. That is, the longitudinal direction of each yarn 2A of each yarn array 1A, 1C, 1E is parallel to each other, and each yarn array 1B, 1D, 1F.
Are orthogonal to the longitudinal direction of each yarn 2B. Each yarn is composed of a fiber bundle 3 made of carbon fiber and a carbon component other than carbon fiber. The yarn assembly 6 having a three-dimensional lattice shape is formed by stacking the yarn arrays. Each yarn is crushed during a pressure forming process as described below, and has a substantially elliptical shape.

In each of the yarn arrays 1A, 1C, and 1E, the gap between the adjacent yarns has a matrix 8A.
And each matrix 8A extends along and parallel to the surface of the yarn 2A. In each of the yarn arrays 1B, 1D, and 1F, the gap between adjacent yarns is filled with a matrix 8B, and each matrix 8B extends along the surface of the yarn 2B and parallel thereto. In this example, the matrices 8A and 8B are respectively composed of silicon carbide phases 4A and 4B covering the surface of each yarn.
And Si-SiC-based material phases 5A and 5B having a lower carbon content than silicon carbide phases 4A and 4B. Silicon may also be partially contained in the silicon carbide phase. Also,
In this example, silicon carbide phases 4A and 4B are also generated between yarns 2A and 2B that are vertically adjacent to each other. Each matrix 8A and 8B is elongated along the surface of the yarn, preferably in a straight line, and each matrix 8A and 8B is orthogonal to each other. And a matrix 8A in the yarn array 1A, 1C, 1E;
The matrix 8B in the yarn arrays 1B, 1D, and 1F orthogonal to this is continuous at the gap between the yarns 2A and 2B. As a result, matrix 8
A and 8B form a three-dimensional lattice as a whole.

The Si—SiC-based composite material can be produced, for example, by the following method disclosed in Japanese Patent Application No. 10-267462 filed on Sep. 4, 1998. That is, for a bundle of carbon fibers, a powdery binder pitch that finally becomes a matrix, including cokes,
Further, a carbon fiber bundle is produced by adding a phenol resin powder or the like as necessary. A flexible coating made of a plastic such as a thermoplastic resin is formed around the carbon fiber bundle to obtain a flexible intermediate material. This flexible intermediate material is formed into a yarn (Japanese Patent Application No. 63-231791), and after laminating the required amount, 300 to 2 by hot pressing.
A molded article is obtained by molding under conditions of 000 ° C. and Josho to 500 kg / cm ² . Alternatively, if necessary, the molded body is carbonized at 700 to 1200 ° C.
It is graphitized at 00 to 3000 ° C. to obtain a sintered body.

The carbon fiber is made from petroleum pitch or coal tar pitch as a raw material, and pitch-based carbon fiber obtained by adjusting spinning pitch, melt-spinning, infusibilizing and carbonizing, and acrylonitrile (co) polymer fiber are flame-proofed. Any of PAN-based carbon fibers obtained by carbonization may be used.

As the organic binder necessary for forming the matrix, a thermosetting resin such as a phenol resin or an epoxy resin, tar, pitch, and the like are used. These include cokes, metals, metal compounds, inorganic and organic compounds, and the like. May be included. Some of the organic binder may serve as a carbon source.

Next, the compact or sintered compact produced as described above and Si are held for 1 hour or more in a temperature range of 1100 to 1400 ° C. and a furnace pressure of 0.1 to 10 hPa.
Preferably, at this time, 0.1 NL (normal liter: 1200) per kg of the total weight of the molded body or the sintered body and Si.
(In the case of 0 ° C. and a pressure of 0.1 hPa, which corresponds to 5065 liters) or more, an Si—SiC layer is formed on the surface of the compact or sintered body while flowing an inert gas of not less than 5065 liters. Then the temperature 1450
The temperature is raised to about 2500 ° C., and the Si—SiC-based material is melted and impregnated into the open pores of the compact or sintered body.
In this process, when a compact is used, the compact is fired to produce a Si-SiC composite material. Si-Si in the entire Si-SiC-based composite material
The concentration gradient of the C-based material is adjusted based on the open porosity and the pore diameter of the compact or sintered body.

In the present invention, “SiC-based composite material” refers to a basic skeleton composed of a C / C composite
-A material having a configuration surrounding a matrix made of a SiC-based material.

More specifically, “SiC-based composite material”
Is a SiC-C / C composite composite material composed of silicon carbide, carbon fibers, and carbon components other than carbon fibers, and having a structure including a skeleton and a matrix formed around the skeleton. At least 50% of silicon carbide
Is a β type, the skeleton is formed of carbon fibers and carbon components other than carbon fibers, silicon carbide may be present in a part of the skeleton, and the matrix is formed of silicon carbide; The matrix and the skeleton are integrally formed, and the composite material is 0.5%
It refers to a composite material having a porosity of ~ 5% and a distribution of two-peaked average pore diameter. The dynamic friction coefficient of the SiC-based composite material is 0.0
5 to 0.6, and 10 ° C. in the atmosphere.
It is preferable that the temperature at which a 5% weight loss occurs when the temperature is raised at a rate of 600 ° C./min is 600 ° C. or higher.

Here, “C / C composite” is the same as in the case of “Si—SiC-based composite material”.

Since the skeleton of the SiC-based composite material is a C / C composite, even if SiC is formed in a part of the skeleton, the structure of each carbon fiber is maintained without being destroyed. The fiber has a great feature that the fiber does not become short due to silicon carbide, and the mechanical strength of the C / C composite as a raw material is almost maintained or increases due to silicon carbide. Moreover, the yarn assembly has a composite structure in which a matrix made of a SiC-based material is formed between adjacent yarns. In this respect, it is different from the above-described Si-SiC-based composite material. This material is disclosed in Japanese Patent Application No. Hei.
It can be produced by the method disclosed in 1-31979. Therefore, the contents of Japanese Patent Application No. 11-31979 are cited here.

Here, “SiC-based material” refers to a material containing silicon carbide having a different degree of bonding to carbon,
/ C composite can be produced by impregnating metallic silicon. At this time, the metallic silicon reacts with carbon atoms constituting carbon fibers in the composite and / or free carbon atoms remaining on the surface of the carbon fibers, and is partially carbonized. Partially carbonized silicon is generated between the yarns made of the surface or the carbon fiber, and thus a matrix made of silicon carbide is formed between the yarns.

The matrix may include several different phases, from a silicon carbide phase in which trace amounts of silicon and carbon are bonded to a pure silicon carbide crystal phase. However, this matrix contains only metallic silicon below the X-ray detection limit (0.3% by weight).
That is, although this matrix is typically made of a silicon carbide phase, the silicon carbide phase may include a SiC-based phase in which the content of silicon is inclined. Therefore, the SiC-based material refers to a concentration of carbon of at least 0.01 mol% to 50 mol% in such a SiC series.
It is a general term for materials included in the range up to%. or,
The SiC-based composite material may have a gradient composition in which the silicon content increases as the matrix moves away from the skeleton surface. In order to control the carbon concentration to less than 0.01 mol%, strict measurement of the amount of metallic silicon to be added is required in relation to the amount of free carbon in the C / C composite. It is not practical because the temperature control in the process becomes complicated. Therefore, it is theoretically possible to control the carbon concentration to about 0.001 mol%.

The skeleton of the “SiC-based composite material” is basically the same as the “Si—SiC-based composite material” shown in FIG. Therefore, FIG. 7 will be described as an example of “SiC-based composite material”. FIG. 9A is a cross-sectional view taken along the line IIa-IIa, and FIG. 9B is a cross-sectional view taken along the line IIb-IIb when FIG. 7 is regarded as the skeleton of the “SiC-based composite material”.
Shown in

The skeleton of the SiC-based composite material 17 is Si—
Like the skeleton of the SiC-based composite material, it is constituted by a yarn aggregate 16. The yarn aggregate 16 includes the yarn arrays 11A, 11B, 11C, 11D, 11E, and 11F.
Are stacked vertically. In each yarn array, the yarns 13 are two-dimensionally arranged, and the longitudinal directions of the yarns are substantially parallel. The longitudinal direction of each yarn in each vertically arranged yarn array is orthogonal. That is, each yarn array 11A, 11C, 11
The longitudinal direction of each yarn 12A of E is parallel to each other,
And it is orthogonal to the longitudinal direction of each yarn 12B of each yarn array body 11B, 11D, 11F. Each yarn is
The fiber bundle 13 includes carbon fibers and a carbon component other than carbon fibers. The yarn assembly 16 having a three-dimensional lattice shape is formed by stacking the yarn arrays.
Each yarn is crushed during a pressing step, as described below, and is slightly oval.

Each yarn array 11A, 11C, 11E
In, the gap between adjacent yarns is filled with a matrix 18A, and each matrix 18A extends along and parallel to the surface of the yarn 12A. In each of the yarn arrangements 11B, 11D, 11F, the gap between adjacent yarns is filled with a matrix 18B, and each matrix 18B extends along the surface of the yarn 12B and parallel thereto. As shown in FIGS. 9A and 9B, the matrices 18A and 18A
B consists of a silicon carbide phase 14 covering the surface of each yarn. Part of the silicon carbide phase is the small protrusion 1
It may project to the surface as 9 or to the carbon fiber layer inside the composite member. Pores (voids) having a median diameter of about 100 μm are formed inside such small projections. In addition, since the small protrusions 19 are formed along the traces of the matrix composed of carbon components other than the carbon fibers of the raw material C / C composite, most of the small protrusions 19 have a space between the yarns and / or a yarn arrangement. By appropriately selecting the distance from the yarn array, it is possible to adjust the density of the small projections 19 per unit area. Adjacent yarns 12A and 12B
Between them, silicon carbide phase 14 may be formed.

Each of the matrices 18A and 18B is elongated, preferably linear, along the surface of the yarn, respectively, and each of the matrices 18A and 18B is orthogonal to one another. Then, the yarn arrays 11A, 11
The matrix 18A in C and 11E and the matrix 18B in the yarn arrays 11B, 11D and 11F orthogonal thereto are continuous at the gap between the yarns 12A and 12B, respectively. As a result, matrix 1
8A and 18B form a three-dimensional lattice as a whole.

The SiC-based composite material can be produced, for example, by the following method disclosed in Japanese Patent Application No. 11-31979 filed on Feb. 9, 1999. That is, Si-
A molded body or a fired body made of carbon fiber manufactured in the same manner as in the case of the SiC-based composite material and metal silicon were mixed with each other in a range of 1100 to 1
The temperature is maintained at 400 ° C. and the furnace pressure is kept at 0.1 to 10 hPa for 1 hour or more. The holding time may vary depending on various factors, but the generated gas such as CO accompanying the change of the inorganic polymer or inorganic substance into ceramics is removed from the firing atmosphere,
Also, it is sufficient that the time is long enough to prevent contamination of the firing atmosphere from the outside by O ₂ or the like in the atmosphere. At this time,
0.1 kg / kg of the total weight of the molded body or fired body and silicon.
1NL (normal liter: 1200 ° C, pressure 0.1h
In the case of Pa, it is preferable to form an SiC layer on the surface of the compact or fired body while flowing an inert gas of 5065 liters or more. Then the temperature 1450-250
The temperature is raised to 0 ° C., and silicon is melted and impregnated into the open pores of the compact or fired body to form a SiC-based material first.

Next, the furnace temperature is temporarily cooled to the ambient environment temperature (20 ° C. to 25 ° C.), or while the furnace temperature is maintained as it is, the furnace pressure is increased to about 1 atm. Is raised to 1800 ° C. to 2800 ° C., and in some cases, metallic silicon which may remain and silicon carbide which has already been formed are converted into carbon fibers and carbon components outside carbon fibers (partially graphitized carbon Containing free carbon) and react with these carbons.
In this case, a holding time of about one hour is sufficient. Also,
In this process, when a compact made of a C / C composite is used, the compact is fired, and
An iC-based composite material is produced.

In the present invention, the first sliding structure and the second sliding structure are combined, and the sliding ring 44 is divided in the circumferential direction as shown in FIG.
And the groove 42 has a trapezoidal shape of approximately the same size with the outer peripheral side of the shaft 41 as the upper bottom when the groove 42 is cut along a plane including the rotating shaft. Further, at least one of the openings of the sliding ring 44 If the plane obstructing and the plane perpendicular to the rotation axis 46 are obliquely oriented, damage to the sliding ring 44 and the groove 4
2 can be prevented and the sliding ring 44 and the shaft 41 can be prevented from idling. Further, the first sliding structure or the second sliding structure of the present invention or a combination of the first sliding structure and the second sliding structure, for example, FIG.
In the sliding structure shown in FIG.
If the inner wall of the shaft hole provided in the bearing is made of a Si-SiC-based composite material or a SiC-based composite material, it is possible to impart excellent wear resistance to these sliding structures. Can be extended, and smoother sliding can be performed.

The sliding structure of the present invention can be suitably used for a sliding structure used in a molten metal, for example, a roll device such as a sink roll device and a support roll device provided in a molten metal plating device. .

[0056]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Embodiment 1) As shown in FIG. 1, a shaft 41 in which a sliding ring 44 is divided into three pieces 45 in a circumferential direction.
The steel strip was subjected to aluminum plating using a molten metal plating apparatus having a sink roll device provided with a support roll device and a support roll device, and damage to the sliding ring 44 and detachment from the groove 42 were examined.

The sliding ring 44 has a groove 42 provided on the shaft 41.
When the sliding ring 44 and the groove 42 are cut along a plane including the rotation axis, the cross-sectional shape is
1 was a trapezoid with the outer peripheral side as the upper bottom. A clearance of 0.1 to 0.5 mm was provided between the sliding ring 44 and the wall of the groove 42.

The sliding ring 4 used for the sink roll device
The size of the two base angles of the trapezoid when cutting 4 is 4
5 °, the length of the upper and lower bases is 20 mm, 3
The height was 4 mm and the height was 6 mm. The inner and outer diameters of the sliding ring 44 were 99 mm and 113 mm, respectively, and the diameter of the shaft 41 was 99 mm. The size of the sink roll was 400 mm in diameter and 1000 mm in width.

As shown in FIG. 2, the dividing line 47 on the outer peripheral surface of the sliding ring 44
The film was divided so as to be oriented at 5 ° to the rotation direction of No. 4.
The coefficient of thermal expansion of the sink roll, support roll and shaft body is 1
85 × consisted 10 ^-6 / ° C. is SCH13, slide ring 44 is a thermal expansion rate of 18,5 × 10 ^-6 / ℃ SC
H13. Further, a layer made of a Si-SiC-based composite material was provided on the inner wall of the shaft hole provided in the bearing.

As shown in FIG. 5, the molten metal plating apparatus 21 includes the above-described sink roll device 24, support roll device 25, and wiping nozzle 26,
Plating tank 23 filled with 00 ° C molten aluminum 22
Used in a state of being immersed.

After operating the molten metal plating apparatus 21 for 5 days, the slide ring 44 was visually inspected for breakage and detachment from the groove 42.

(Embodiment 2) As shown in FIG.
Sink roll device and support roll device provided with a shaft 41 whose angle formed by a plane 56 closing the opening of the slide ring 44 and a plane 55 perpendicular to the rotation axis 46 is 45 °. The steel strip was subjected to aluminum plating using a hot-dip metal plating apparatus having the following conditions, and idle rotation between the sliding ring 44 and the shaft 41 was examined.

The sliding ring 44 is provided with a groove 42 provided on the shaft 41.
The diameter of the shaft 41 and the diameters of the sink roll and the support roll were the same as in Example 1. The inner and outer diameters of the sliding ring 44 used in the sink roll device were 99 mm and 113 mm, respectively, and the thickness and width of the sliding ring 44 were 6 mm and 80 mm, respectively. The inner and outer diameters of the sliding ring 44 used for the support roll device were 120 mm and 140 mm, respectively, and the thickness and width of the sliding ring 44 were 100 mm and 10 mm, respectively.

The sink roll, the support roll, and the shaft body are made of SCH 13 having a coefficient of thermal expansion of 185 × 10 ⁻⁶ / ° C., and the sliding ring 44 has a coefficient of thermal expansion of 18, 5 × 10 ^−6.
And SCH13 at / ° C. Further, a layer made of a Si-SiC-based composite material was provided on the inner wall of the shaft hole provided in the bearing.

Example 1 Using the molten metal plating apparatus 21 shown in FIG. 5 and configured with the above-mentioned sink roll apparatus 24, support roll apparatus 25 and wiping nozzle 26.
Similarly, for 5 days, the molten metal plating apparatus 21 was operated to check whether the sliding ring 44 and the shaft 41 were idle. Table 2 shows the results.

Embodiment 3 As shown in FIG. 4, the sliding ring 44 was divided into three pieces 45 in the circumferential direction, and the sliding ring 44 and the groove 42 were cut along a plane including the rotation axis. In this case, the cross-sectional shape is a trapezoid with the outer peripheral side of the shaft 41 as the upper bottom, and the size of the angle formed by the plane closing the opening of the slide ring 44 and the plane perpendicular to the rotation axis is A steel strip is plated with aluminum using a molten metal plating apparatus having a sink roll device and a support roll device having a shaft 41 set at 30 °, and the sliding ring 44 is damaged, detached from the groove 42, and slid. The idle rotation between the moving ring 44 and the shaft 41 and the wear amount of the sliding ring were examined.

The sliding ring 44 is provided with a groove 42 provided on the shaft 41.
And a clearance of 0.1 to 0.5 mm is provided between the sliding ring 44 and the wall of the groove 42.

Sliding ring 4 used for sink roll device
The size of the two base angles of the trapezoid when cutting 4 is 4
5 °, the length of the upper and lower bases is 80 mm, 1
00 mm and height were 10 mm. The inner and outer diameters of the sliding ring 44 were 105 mm and 135 mm, respectively, and the diameter of the shaft 41 was 99 mm. The dimensions of the sink roll were the same as those in Example 1.

The sliding ring 44 was divided so that the dividing line 47 on the outer peripheral surface of the sliding ring was oriented at 5 ° with respect to the rotation direction of the sliding ring 44.

The inner wall of the shaft hole provided in the bearing has Si
-A layer made of a SiC-based composite material is provided, and the sliding ring is made of S
It was composed of an i-SiC-based composite material.

Embodiment 1 Using the molten metal plating apparatus 21 shown in FIG. 5, which is composed of the above-mentioned sink roll apparatus 24, support roll apparatus 25 and wiping nozzle 26.
In the same manner as in Example 1, the molten metal plating apparatus 21 was operated for 5 days, and damage to the sliding ring 44, detachment from the groove 42, and idling between the sliding ring 44 and the shaft 41 were examined as in Example 1. Further, the wear amount of the sliding ring was examined by measuring the degree of decrease in the height of the sliding ring after the operation was completed. Table 2 shows the results.

(Comparative Example 1) A sink roll device and a support roll device similar to those in Example 1 are provided, except that the sliding ring and the groove have a square cross section when cut along a plane including the rotation axis. Using a molten metal plating apparatus, the steel strip was subjected to aluminum plating in the same manner as in Example 1, and damage to the sliding ring and detachment from the groove were examined in the same manner as in Example 1. Table 2 shows the results.

COMPARATIVE EXAMPLE 2 Except that the angle formed by a plane closing each of the openings of the sliding ring and a plane perpendicular to the rotation axis was 0 °. A steel strip was subjected to aluminum plating as in Example 2 using a molten metal plating apparatus having a sink roll device and a support roll device having the same shaft as in Example 2, and a sliding ring and a shaft as in Example 2. I checked the idle rotation with. Table 2 shows the results.

(Comparative Examples 3 and 4) A layer made of SCH13 (Comparative Example 3) or Sialon (Comparative Example 4) was provided on the inner wall of the shaft hole provided in the bearing, and the sliding ring was made of SCH13 (Comparative Example 3) or Sialon. A steel strip was subjected to aluminum plating in the same manner as in Example 3 by using a molten metal plating apparatus having the same sink roll device and support roll device as in Example 3 except that it was constituted from (Comparative Example 4). In the same manner as in Example 3, the wear amount of the sliding ring was examined. Table 2 shows the results. In Comparative Example 4, when the molten metal plating apparatus was placed in the molten metal, the sliding ring was damaged by thermal shock, so that the amount of wear could not be measured.

[0076]

[Table 2]

[0077]

According to the first sliding structure of the present invention, since the sliding ring is divided in the circumferential direction, the coefficient of thermal expansion of the sliding ring is smaller than that of the shaft body. Even in this case, the sliding ring is not damaged in the molten metal, and each piece constituting the sliding ring is not separated from the groove due to centrifugal force.

Further, when the second sliding structure of the present invention is used, even if the coefficient of thermal expansion of the sliding ring is larger than the coefficient of thermal expansion of the shaft body, the sliding ring can be used in the molten metal. Can be prevented from idling.

Further, in the third sliding structure of the present invention, since the sliding portion is made of a Si—SiC-based composite material or a SiC-based composite material, sufficient heat resistance, thermal shock resistance, and abrasion resistance are provided. And has a significantly longer life than conventional sliding structures, so that smoother sliding can be performed. Therefore, the cost of the plating operation can be reduced, and the vibration of the molten metal plating apparatus due to the abrasion of the sliding structure can be prevented, so that the quality of the plated product can be prevented from being varied.

That is, if the first, second or third sliding structures of the present invention are used alone or in combination with the characteristics of the respective sliding structures, good sliding is ensured in the molten metal. Because the sliding structure of the present invention,
For example, a sink roll device provided in a molten metal plating device,
It can be suitably used as a roll device such as a support roll device.

[Brief description of the drawings]

FIG. 1A is a schematic view showing an example of a sliding structure of the present invention, FIG. 1B is a cross-sectional view taken along line AA of FIG. 1A, and FIG. 1B is a cross-sectional view taken along line BB of FIG. .

FIG. 2 is a schematic view showing an example of a method of dividing a sliding ring.

3A is a perspective view showing another example of the sliding structure of the present invention, FIG. 3B is a schematic view showing a locus of a cross-sectional shape, and FIG. 3C is a perspective view showing still another example.

4A is a schematic view showing still another example of the sliding structure of the present invention, and FIG. 4B is a cross-sectional view taken along line AA of FIG.
It is a BB sectional view taken on the line of (a).

FIG. 5 is a schematic view showing an example of a hot metal plating apparatus.

FIG. 6 is a schematic view showing an example of a conventional sliding structure.

FIG. 7 is a perspective view illustrating an example of a skeleton of a Si—SiC-based composite material.

8A is a sectional view taken along the line IIa-IIa in FIG. 7, and FIG. 8B is a sectional view taken along the line IIb-IIb in FIG.

9A and 9B are sectional views taken along line IIa-IIa in FIG. 7 and FIG. 7B taken along line IIb-IIb in FIG. 7 when FIG. 7 is regarded as a perspective view showing an example of a skeleton of the SiC-based composite material. is there.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Yarn arrangement, 2 ... Yarn, 3 ... Fiber bundle, 4 ... Silicon carbide phase, 5 ... Si-SiC-based material phase, 6 ... Yarn aggregate, 7 ... Si-SiC-based composite material, 8 ... Matrix,
11: yarn array, 12: yarn, 13: fiber bundle, 1
4 ... silicon carbide phase, 15 ... Si-SiC material phase, 16 ...
Yarn aggregate, 17: SiC-based composite material, 18: Matrix, 19: Small protrusion, 21: Hot-dip metal plating apparatus,
22: molten metal, 23: plating tank, 24: sink roll device, 25: support roll device, 26: wiping nozzle, 27: sink roll, 28: shaft, 29: support roll, 30: shaft, 31: steel strip, 32: layer made of a corrosion-resistant heat-resistant alloy or sialon; 33: shaft body, 3
4 sliding ring, 40 shaft hole, 41 shaft, 42 groove, 4
3: Shaft main body, 44: Sliding ring, 45: Fragment, 46: Rotating shaft, 47: Dividing line, 48, 49 ... Locus of sectional shape, 5
0 ... bearing, 51 ... bearing, 52 ... sliding structure, 53 ...
Splitting surface of the sliding ring, 55 ... plane perpendicular to the rotation axis, 56
... A plane that closes the opening of the sliding ring.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J011 AA08 AA20 CA01 DA01 PA03 QA07 SB01 SB20 3J103 CA25 DA01 FA01 FA11 FA13 FA26 GA02 GA52

Claims (28)

[Claims] 1. A sliding structure having a bearing, a shaft relatively rotating in a shaft hole provided in the bearing, wherein the shaft has a shaft main body having a groove in a circumferential direction; The sliding ring is made of a material having a different coefficient of thermal expansion from that of the shaft main body, and is divided into three or more and eight or less pieces in the circumferential direction. A sliding structure, wherein a cross-sectional shape of the sliding ring and the groove when cut along a plane including a rotating shaft is a trapezoid having substantially the same size with the outer peripheral side of the shaft being an upper bottom. 2. The sliding structure according to claim 1, wherein the divided surface of the sliding ring intersects the rotation axis only at one point. 3. The trapezoid has a base angle of 30 ° or more, and
The sliding structure according to claim 1, wherein the angle is 0 ° or less. 4. A sliding structure having a bearing, a shaft relatively rotating in a shaft hole provided in the bearing, wherein the shaft has a shaft main body having a circumferential groove, The sliding ring is made of a material having a different thermal expansion coefficient from that of the shaft main body, and has a sectional shape when the sliding ring is cut along a plane including the rotating shaft. A sliding structure, wherein at least one of the trajectories is different from the trajectory of the cross-sectional shape when cut along another plane including the rotation axis. 5. A trajectory of a cross-sectional shape when the slide ring is cut along a plane including a rotation axis, and at least one of trajectories of a cross-sectional shape when cut along another plane including a rotation axis is different from the trajectory of the slide ring. 4. The sliding structure according to 2 or 3. 6. The sliding structure according to claim 4, wherein a plane closing at least one of the openings of the sliding ring and a plane perpendicular to the rotation axis are obliquely oriented. 7. The method according to claim 6, wherein an angle formed between a plane closing at least one of the openings of the sliding ring and a plane perpendicular to the rotation axis is 5 ° or more. Sliding structure. 8. The sliding structure according to claim 1, wherein at least the sliding ring and the inner wall of the shaft hole are made of a Si—SiC-based composite material or a SiC-based composite material. 9. A sliding structure used in a molten metal, wherein at least a sliding portion is made of a Si—SiC composite material or a SiC composite material. 10. The sliding structure according to claim 9, comprising a bearing and a shaft that relatively rotates in a shaft hole provided in the bearing. 11. The Si—SiC-based composite material is composed of 55% to 75% by weight of carbon, 1% to 10% by weight of silicon, and 10% to 50% by weight of silicon carbide. A yarn aggregate in which yarns containing at least a bundle of carbon fibers and a carbon component other than carbon fibers are three-dimensionally combined while being oriented in the layer direction, and are integrated so as not to be separated from each other; A matrix made of a Si-SiC-based material filled between the yarns adjacent to each other in the body, and having a dynamic friction coefficient of 0.05 to 0.6 and pores controlled to 0.5% to 10%. The sliding structure according to claim 8, wherein the sliding structure has a ratio. 12. The Si—SiC-based composite material,
The sliding structure according to claim 11, wherein the matrix has a silicon carbide phase formed along the surface of the yarn. 13. The Si—SiC-based composite material,
The sliding structure according to claim 12, wherein the matrix has a silicon phase made of silicon, and the silicon carbide phase is formed between the silicon phase and the yarn. 14. The Si—SiC-based composite material,
14. The sliding structure according to claim 11, wherein the matrix has a gradient composition in which the content ratio of silicon increases as the matrix moves away from the surface of the yarn. 15. The Si—SiC-based composite material,
The yarn aggregate includes a plurality of yarn arrays, and each yarn array is formed by two-dimensionally arranging the plurality of yarns substantially in parallel, and the respective yarn arrays are stacked. The sliding structure according to any one of claims 11, 12, 13, and 14, wherein the yarn assembly is formed by performing the following steps. 16. The Si—SiC-based composite material,
The sliding structure according to claim 15, wherein the longitudinal directions of the yarns in the adjacent yarn arrays cross each other. 17. The Si—SiC-based composite material,
The said matrix forms a three-dimensional network structure by being mutually continuous in the said Si-SiC composite material.
17. The sliding structure according to any one of 1 to 16. 18. The Si—SiC-based composite material,
The matrices are arranged two-dimensionally substantially in parallel in each of the yarn arrays, and the matrices generated in the adjacent yarn arrays are continuous with each other;
17. The sliding structure according to claim 16, wherein the matrix forms a three-dimensional lattice. 19. The SiC-based composite material is composed of silicon carbide, carbon fiber, and a carbon component other than carbon fiber, and has a structure including a skeleton and a matrix formed around the skeleton, and silicon carbide. Is at least 50% of β type, the skeleton is formed of carbon fiber and a carbon component other than carbon fiber, and silicon carbide may be present in a part of the skeleton. The matrix and the skeleton are formed integrally with silicon carbide, and the SiC-based composite material has a porosity of 0.5% to 5% and a distribution of two-peaked average pore diameter. The sliding structure according to claim 8, 9 or 10, comprising: 20. The sliding structure according to claim 19, wherein in the SiC-based composite material, the matrix is formed along the surface of the skeleton. 21. The sliding structure according to claim 19, wherein a part of the matrix forms a series of small projections in the SiC-based composite material. 22. The SiC-based composite material has a gradient composition in which the content ratio of silicon increases as the matrix moves away from the skeleton surface.
22. The sliding structure according to 0 or 21. 23. In the SiC-based composite material, the skeleton portion is a yarn array produced by arranging at least a plurality of yarns composed of carbon fibers and carbon components other than carbon fibers in a two-dimensional manner substantially in parallel. 23. The sliding structure according to claim 19, 20, 21 or 22, wherein the sliding structure is made of a yarn assembly that is manufactured by laminating a required number of layers alternately and orthogonally. 24. The SiC-based composite material, wherein the matrix is continuous with each other in the SiC-based composite material to form a three-dimensional network structure.
The sliding structure according to any one of the above. 25. The SiC composite material according to claim 19, wherein the dynamic friction coefficient is 0.05 to 0.6.
13. The sliding structure according to item 5. 26. The SiC-based composite material according to claim 19, wherein a temperature at which a 5% weight loss occurs when the temperature is raised in the atmosphere at a rate of 10 ° C./min is 600 ° C. or more. 2. The sliding structure according to 1. 27. The sliding structure according to claim 1, wherein the sliding structure is a roll device provided in a molten metal plating device. 28. The sliding structure according to claim 27, wherein the roll device is a sink roll device or a support roll device.