JP5118903B2 - Sealing agent coating apparatus, sealing processing method and bearing - Google Patents

Description

  The present invention relates to a bearing, a sealing agent coating apparatus for manufacturing the bearing, and a sealing processing method using the apparatus.

Insulation that insulates the bearing by forming a ceramic sprayed coating on the inner and outer rings of the bearing, or in contact with any other member, and then applying a sealing treatment to improve the environmental barrier properties of the coating. Bearings are known.
As a general treatment method of the sealing agent to the ceramic sprayed coating, a method of applying the sealing agent to the ceramic sprayed coating (Patent Document 1), a method by reduced pressure infiltration (Patent Document 2), decompression and pressurization. (Patent Document 3) and the like are known.
Moreover, as a sealing treatment method specialized for the cylindrical outer peripheral portion, a method (Patent Document 4) combining immersion, sweeping and spraying is known.

However, the method described in Patent Document 1 has the following problems (a) to (d). (A) It is difficult to hold the workpiece until the sealing agent is applied and the drying process is completed. (B) It is necessary to design a jig having a special shape that can hold the non-processed part of the work so that the undried and uncured sealing agent does not adhere to the part other than the work. (C) When the sealing agent treatment part must be used for holding the workpiece, “It is possible to withstand the drying process of the sealing agent because the undried and uncured sealing agent is not removed from the workpiece. In addition, it is necessary to select a material for the holding material that is “non-adhesive with the sealing agent”, and since such a material is generally an expensive resin, the manufacturing cost is likely to increase. (D) When selecting a general epoxy resin-based sealing agent for applications that require heat resistance and chemical resistance, the sealing agent itself has a high viscosity, so the residual air in the deep part of the ceramic sprayed coating As a result, it is difficult to achieve sufficient permeation only to the site to be treated.
Further, the methods described in Patent Documents 2 and 3 have the following problems (e) to (f). (E) A vacuum suction device is required. (F) Since vacuum suction must be performed after application of the sealing agent, when processing a large product such as an industrial bearing, the entire sealing device becomes large and there is a concern about productivity. . In addition, there is a problem that the manufacturing cost increases.

  The method described in Patent Document 4 has the following problems (g) to (n). (G) Since the scraping jig made of an elastic material is worn by sliding with the ceramic sprayed coating, maintenance at regular intervals is indispensable. (H) When multiple surfaces such as bearings are simultaneously sealed, the structure and operation of positioning of the scraping jig and spray are extremely complicated, and it is difficult to change the setup of the apparatus. (Li) The sealing agent itself will gradually cure or deteriorate after preparation even at room temperature, so if the number of treatments increases, it will be necessary to clean the masking jig and spray at a certain frequency. In addition, there are many parts and maintenance is difficult. (N) Since a spray mechanism is used in combination, a certain amount of time is required for the preparation of the sealing agent in order to perform a stable sealing treatment, and it will be scattered to unnecessary parts. The yield of the amount of sealing agent is deteriorated.

  In addition to the above individual problems, when the sealing agent is sealed on the ceramic sprayed coating, there are generally the following problems (l) to (wa). (L) Depending on conditions such as coating method and application tool used, the amount of the treatment agent is likely to vary. If the amount of the treatment agent is too small, uneven sealing will occur, and if the amount of the treatment agent is excessive, a grinding wheel in the polishing process. There are adverse effects such as a decrease in service life and an increase in processing time, and there are concerns about adverse effects on product functions and productivity. (E) When processing a workpiece having a shape in which parts that are not allowed to adhere to the sealing agent, such as an outer ring of a ceramic sprayed bearing, are processed in a complicated shape, the sealing agent does not adhere to unnecessary parts. The masking jig should be devised, or careful sealing agent application work is required. (W) A low-viscosity sealing agent such as an acrylic resin type or a resin varnish type can ensure a certain degree of penetration into the sprayed film by coating, but the problem of insufficient heat resistance remains. There is also a concern of a sealing error due to the generation of voids in the sprayed film accompanying the volatilization of the solvent. Moreover, in order to make up for voids generated by the volatilization of the solvent, the overcoating must be repeated several times.

  On the other hand, (i) at least one synthetic resin selected from the group consisting of an epoxy resin, an acrylic resin and a xylene resin, as a sealing agent excellent in penetrability and excellent in filling property in a sprayed coating, (ii) From cyclohexene, styrene, vinyl acetate, phenyl vinyl ether, methyl vinyl ketone, (meth) acrylic acid, methyl (meth) acrylate, (meth) acrylamide, (meth) acrylonitrile, maleic anhydride, dicyclopentadiene, and derivatives thereof At least one polymerizable organic solvent selected from the group consisting of: and (iii) a sealing agent containing at least one selected from the group consisting of a fluorosurfactant and a perfluoro group-containing organosilicon compound, and this The sealing agent is allowed to penetrate into the pores of the thermal spray coating, and then the weight contained in the sealing agent. Sealing treatment method of the sprayed coating to polymerize the sexual organic solvent is known (Patent Document 5).

  However, the method described in Patent Document 5 has the following problems (F) to (Y). (F) Only simple heating of the polymerizable organic solvent makes it difficult to actually cure the solvent portion because dissolved oxygen in the solution inhibits the polymerization. In particular, when a styrene monomer, which is a representative example of a polymerizable organic solvent, is used as a polymerizable solvent, the polymerization reaction is not sufficiently performed at the curing temperature of the epoxy resin, and an unreacted polymerizable solvent remains in the epoxy resin and is cured. The long-term stability of the post-sealing resin may be inferior. (Ii) It is necessary to add a radical polymerization initiator for the purpose of promoting the polymerization reaction of the polymerizable solvent, or to highly remove oxygen dissolved in the system of the sealing agent. However, high temperature radical polymerization initiators are generally composed of organic peroxides that are highly reactive and have a high risk of explosions, and therefore require care in handling. On the other hand, if a low temperature type polymerization initiator is selected, such concerns are alleviated. However, since the decomposition reaction of the polymerization initiator proceeds even at a low temperature, it is necessary to pay attention to the pot life of the uncured sealing agent. In addition, from the viewpoint of the amount of dissolved oxygen, it is always required to observe detailed precautions in order to improve storage stability.

  Further, the outer ring of the deep groove ball bearing or the cylindrical roller bearing has substantially the same inner diameter on the width surfaces on both sides. However, some outer rings of bearings have different inner diameters on both width surfaces (Patent Document 6). Further, in the outer ring of the tapered roller bearing, it is usual that the inner diameters of both width surfaces are different (Patent Document 7). Therefore, when the sealing treatment is performed on these bearing outer rings having different shapes on both width surfaces using the sealing agent coating apparatus, the immersion depths to be set in the sealing agent to be set differ between the two width surfaces. When the sealing treatment of these various bearing outer rings is performed by a sealing agent coating apparatus, the conventional apparatus has a structure in which a spindle having an axis parallel to the outer diameter surface of the outer ring rotates. The immersion depth in the agent had to be unified to the immersion depth corresponding to the smaller side of the outer ring width. For this reason, there is a portion that is not sufficiently immersed in the sealing agent on the side where the width dimension is large. After the treatment with the rotary sealing device, the insufficient portion is sealed with a brush or a brush. There was a problem that a pore treating agent had to be additionally applied.

In addition, when sealing the ceramic sprayed bearing outer ring using the sealant coating device, only the outer ring outer diameter surface and the width ceramic sprayed surface of the bearing are sealed in the sealant at a predetermined immersion depth. Must be soaked.
However, when the immersion depth in the sealing agent is shallower than a predetermined depth, the sealing agent is not sufficiently permeated into a part of the sprayed surface. On the other hand, when the immersion depth is deeper than a predetermined depth, the sealing agent adheres to the inner surface of the workpiece, the inner surface of the groove, and the like. For the above reasons, if an appropriate liquid level of the sealing agent is not set for the work to be immersed, there is a possibility that the sealing characteristics are deteriorated, the obstacle during polishing processing, the bearing function is deteriorated, and the like.
Therefore, when performing the sealing treatment, it is necessary to precisely adjust the height of the container containing the sealing agent. However, when the number of sealing treatments increases, there is a high possibility of causing a mistake in setting the liquid level of the sealing agent. Furthermore, when considering the automation of the sealing process, it is necessary to use a measuring device for the sealing agent. Generally, the quantitative device is a complicated device with many moving parts, so it can be used for internal cleaning. There is an increased risk of extraneous matters such as labor, dust, or a cured product of a cured sealing agent entering a new sealing agent.

As described above, even when a conventional sealing agent, a sealing method, or a combination thereof is used, a complicated sealing such as a cylindrical workpiece having a groove in an inner diameter portion such as a ceramic spray bearing is used. In the production of products that require pore treatment, stable treatment of an appropriate amount of a sealing agent at an appropriate site by a simple method is necessary for the technical aspect of the processing method and the sealing agent. It was difficult from the technical aspect.
Japanese Patent Application Laid-Open No. 64-064533 Japanese Patent Laid-Open No. 01-263259 Japanese Patent Laid-Open No. 03-161071 Japanese Patent Application Laid-Open No. 06-057398 Japanese Patent No. 3598401 JP 2005-133876 A JP 2002-181054 A

  The present invention has been made to cope with such a problem, and does not allow a sealing agent to adhere to an unnecessary portion of the outer peripheral surface of a cylindrical workpiece having a groove in the inner diameter portion, and within the ceramic sprayed coating. It is an object of the present invention to provide a sealing agent coating apparatus, a sealing processing method, and a bearing that has been sealed by this method, which can reliably fill the voids by a simple method.

The sealing agent coating apparatus of the present invention (hereinafter also referred to as a sealing processing apparatus) seals a ceramic sprayed coating formed on the outer peripheral surface of a cylindrical workpiece having a groove in the inner diameter portion using a sealing agent. A sealing agent coating apparatus for processing, wherein the cylindrical workpiece is rotated and supported by at least one rotating roller on the inner surface of the cylindrical workpiece, and the cylindrical workpiece is rotated. A sealing agent storage container that is movable in the vertical direction is arranged at the lower part of the cylindrical workpiece.
Further, the means for rotating the cylindrical workpiece includes the cylindrical roller by the rotating roller having an elastic body disposed on the outer peripheral surface of the roller, and at least one guide roller driven in contact with the inner diameter surface of the cylindrical workpiece. The roller structure is characterized in that the work is supported, and at least one of the rotating roller and the guide roller is in contact with the inner surface of the groove of the cylindrical work, and an elastic body is disposed at a portion in contact with the inner surface of the groove.
In addition, the rotary roller has an outer surface having an arcuate cross section in the axial direction.

The sealing processing device is characterized in that an outer peripheral portion of the cylindrical workpiece is immersed in the sealing processing agent, and the rotating roller is rotated in the immersed state.
Moreover, the said sealing processing apparatus has a means to change the angle which the outer peripheral part of the said cylindrical workpiece | work immerses in the said sealing processing agent.

The sealing treatment apparatus includes means for adjusting a depth at which an outer peripheral portion of the cylindrical workpiece is immersed in the sealing treatment agent.
Further, the sealing processing device has a gap of 2 to 10% of the width dimension of the cylindrical workpiece between the outer peripheral portion of the cylindrical workpiece and the bottom surface inside the sealing agent storage container. As provided, there is provided means for detaching the outer peripheral portion of the cylindrical workpiece, which is immersed in the sealing agent and in contact with the bottom surface inside the container, by a reversing operation. Here, the width dimension of the cylindrical workpiece refers to a length (mm) obtained by “{(workpiece outer diameter dimension) − (workpiece inner diameter dimension)} × 0.5”.

  The sealing agent contains an epoxy group-containing component and a curing agent, does not contain a polymerizable vinyl group-containing solvent, and the epoxy group-containing component has 3 or more epoxy groups contained in one molecule. The polyglycidyl ether compound is an essential component, and the mixture contains at least one selected from alkylene diglycidyl ether compounds and cycloaliphatic diepoxy compounds having two epoxy groups in one molecule. It is a sealing agent in which a polyglycidyl ether compound is blended in an amount of 10 to 80% by weight with respect to the entire epoxy group-containing component excluding the agent.

The sealing treatment method of the present invention is a method for sealing a ceramic sprayed coating formed on the outer peripheral surface of a cylindrical workpiece having a groove in its inner diameter using the sealing processing device, wherein the cylindrical workpiece The sealing agent is applied and permeated into the outer peripheral portion of the cylindrical workpiece by rotating the rotating roller in a state where the outer peripheral portion of the cylindrical workpiece is immersed in the sealing agent.
The bearing of the present invention is characterized in that it is a bearing having a ceramic sprayed coating sealed on the outer peripheral surface of the outer ring by the sealing processing method.

  The sealing agent coating apparatus according to the present invention includes a sealing agent container that rotatably supports an inner diameter surface of a cylindrical workpiece with at least one rotating roller and is movable in the vertical direction with respect to the cylindrical workpiece. Since the sealing agent is disposed at the bottom of the cylindrical workpiece, the sealing agent only comes into contact with the portion (hereinafter also referred to as the surface to be processed) where the cylindrical workpiece is to be sealed. The cylindrical workpiece can be accurately rotated at an arbitrary speed without being in contact with. Moreover, since the said predetermined sealing agent is used as a sealing agent, as a result of being excellent in the permeability to the ceramic sprayed coating surface, an uncured sealing agent does not flow out to parts other than the surface to be processed. The sealing process can be performed only on the surface to be processed. Here, the outer peripheral surface of the cylindrical workpiece to be processed is a workpiece outer diameter surface, both workpiece width surfaces, or a workpiece outer diameter surface and both workpiece width surfaces.

Further, the sealing agent coating device supports the cylindrical workpiece by a rotating roller and at least one guide roller driven in contact with the inner surface of the cylindrical workpiece, and at least one of the rotating roller and the guide roller. Is in contact with the groove inner surface of the cylindrical workpiece, so when rotating a cylindrical workpiece having a groove in the inner diameter portion, for example, a cylindrical workpiece with a rolling surface formed in the inner diameter portion such as a bearing outer ring, Rotating roller can be in direct contact with the rolling surface of the part (for example, arc groove for deep groove ball bearing, rectangular groove for cylindrical roller bearing), and rotation accuracy of outer ring during sealing process at any speed And the immersion depth of the workpiece with respect to the liquid level of the sealing agent can be made constant.
In addition, the roller structure has an elastic body made of a soft material such as urethane resin or silicone resin in the part that contacts the groove inner surface of the cylindrical workpiece, so ceramic powder scattered during spraying or burrs falling off during spraying Hard foreign matters such as can be easily embedded in the elastic body.

  Further, at least one of the rotating rollers has a circular cross section in the axial direction of the outer diameter surface thereof, so that the rolling surface of the cylindrical work inner diameter portion is a rectangular groove, a circular roller bearing, The outer ring of either a deep groove ball bearing or a tapered roller bearing with an inclined rolling surface can be supported by contacting a rotating roller with the workpiece without any special adjustment, making the rotation of the workpiece smooth. Can be done.

  Since the sealing agent coating apparatus of the present invention has means for changing the angle at which the outer peripheral portion of the cylindrical workpiece is immersed in the sealing agent, for example, a tapered outer bearing such as a tapered roller bearing, in which the inner diameters of both width surfaces of the outer ring are different. With respect to the sealing process, it is possible to perform the sealing process on both width surfaces of the workpiece at one time without performing an additional process such as brush coating, and a stable sealing process can be quickly performed.

  Since the sealing agent coating apparatus of the present invention has means for adjusting the depth at which the outer peripheral portion of the cylindrical workpiece is immersed in the sealing agent, the workpiece is immersed in the sealing agent at an arbitrarily set depth. it can.

  Furthermore, since the sealing agent used in the sealing agent coating apparatus of the present invention has the above-mentioned predetermined composition, the compounding components substantially all undergo a polymerization reaction to form a cured product, and a polymerizable vinyl group-containing solvent. It is possible to reduce the viscosity of the sealing agent without the need to add, etc., and to prevent elution of volatiles and unpolymerized organic solvents from the cured sealing agent, effectively entering the sprayed film Can penetrate. The term “substantially all” as used herein means that a by-product such as gas or water is generated during the polymerization reaction of the sealing agent, and is evaporated outside the system, and a phenomenon in which the volume of the cured product is reduced is not observed. Specifically, it means that the weight loss before and after heating of the sealing agent is within 1%.

In the sealing treatment method of the present invention, the outer peripheral portion of the cylindrical workpiece is sealed by rotating the rotating roller in a state where the outer peripheral portion of the cylindrical workpiece is immersed in the sealing treatment agent using the sealing processing device. Since the treatment agent is applied and infiltrated, the voids in the ceramic sprayed coating can be reliably filled with the sealing treatment agent by a simple method.
In addition, since the ceramic spray coating is reliably filled in the gap as described above, the bearing of the present invention can maintain a reliable sealing performance over a long period of time.

An example of the sealing treatment apparatus of the present invention is shown in FIGS. 1 (a) and 1 (b). FIG. 1A is a view of the cylindrical work as viewed from the side, and FIG. 1B is a view of the cross section of the cylindrical work as viewed from the front of the apparatus.
In FIGS. 1 (a) and 1 (b), a cylindrical workpiece 1 is an outer ring of a deep groove ball bearing having a ceramic sprayed coating on its outer peripheral surface. The cylindrical workpiece 1 is rotatably supported by a rotating roller 2 and two guide rollers 3, the outer diameter surface 1 a has an opening on the upper surface, and a sealing agent storage container disposed at the lower portion of the cylindrical workpiece. 5 is in contact with the liquid surface 4 a of the sealing agent 4 accommodated in 5. The sealing agent storage container 5 is fixed on a casing 8a such as a lifting platform that can move in the vertical direction with respect to the cylindrical workpiece 1, and the diameter of the cylindrical workpiece 1 and the sealing agent to the workpiece are fixed. The liquid level of the sealing agent 4 can be arbitrarily set according to the degree of penetration and the change in the liquid level to be set. This liquid level 4a can be adjusted according to the processing surface of the sealing agent required for the cylindrical workpiece 1. Therefore, it is possible to prevent the sealing agent from adhering to unnecessary parts. In the case of an outer ring of a deep groove ball bearing, a treatment surface of a uniform sealing agent can be formed at a time not only on the outer diameter of the outer ring but also on both width surfaces.

  As shown in FIG. 1B, the rotating roller 2 that supports the cylindrical workpiece 1 has an outer surface 2a having an arcuate cross section in the axial direction, and the curved inner surface 1b of the cylindrical workpiece, In contact with arc grooves for deep groove ball bearings, rectangular grooves for cylindrical roller bearings, and the like. The roller of the rotating roller 2 has a roller structure in which an elastic body such as urethane rubber is disposed at a portion in contact with the groove inner surface 1b. The rotary roller 2 is pivotally supported by a rotary roller bearing 6 and is rotated by a drive motor 7 having a built-in speed reducer to rotate the cylindrical workpiece 1. The bearing 6 and the drive motor 7 are placed on the housing 8b.

  The two guide rollers 3 that support the cylindrical workpiece 1 are in contact with the inner diameter surface 1 c of the cylindrical workpiece 1 and are driven. The shaft 3a of the guide roller 3 moves up and down by an elevating mechanism provided in the housing 8b so as to contact the inner diameter surface 1c and support the cylindrical workpiece 1. The housings 8a and 8b are disposed on the pedestal 14a.

  In FIG. 1B, the rotating roller 2 and the guide roller 3 that support the cylindrical workpiece 1 are arranged such that the rotating roller 2 is disposed on the groove inner surface 1b of the cylindrical workpiece and the guide roller 3 is disposed on the inner diameter surface 1c. The rotating roller 2 may be disposed on the inner diameter surface 1c of the cylindrical workpiece 1, and at least one of the guide rollers 3 may be disposed on the groove inner surface 1b. Preferably, the rotating roller 2 is disposed on the groove inner surface 1b of the cylindrical workpiece. By disposing on the groove inner surface 1b, for example, even when there is no guide roller 3, the rotation of the cylindrical workpiece 1 can be stably maintained.

When the cylindrical workpiece 1 is immersed in the sealing agent 4, it is preferable that a predetermined amount of gap be formed between at least the outer peripheral surface of the workpiece and the inner surface of the container 5 in which the sealing agent 4 is stored. The space between the work outer peripheral surface and the inner surface of the container 5 is between the outer diameter surface 1 a of the work immersed in the sealing agent 4 and the bottom surface inside the container 5.
By providing the above gap between the work outer peripheral surface and the bottom surface inside the container 5, the cylindrical work 1 immersed in the sealing agent 4 does not come into contact with the inner surface of the container 5, and the cylindrical work 1 is removed. It can be rotated smoothly.

  Moreover, the container 5 can be used if it is a material which is hard to react with the sealing agent 4 to be accommodated. As a specific example, polyethylene, polypropylene, or polymethylpentene is preferable because it is inexpensive and easily available. Moreover, as a molding method of the container 5, it is preferable to employ transfer molding or injection molding that can be mass-produced at low cost.

Another example of the sealing treatment apparatus of the present invention is shown in FIGS. 2 (a) and 2 (b). 2A is a view of a cross section of the cylindrical workpiece and the processing apparatus as viewed from the front of the processing apparatus, and FIG. 2B is an enlarged view of a portion A in FIG. 2A.
2 (a), a cylindrical workpiece 1 is an outer ring of a deep groove ball bearing having a ceramic spray coating on the outer peripheral surface, and each member in FIG. 2 (a) is the sealing agent shown in FIG. 1 (b). This corresponds to each member of the coating apparatus.

Further, in the sealing treatment apparatus shown in FIG. 2A, in addition to the structure described in FIG. 1B, the entire apparatus is inclined so that the outer diameter surface 1a of the cylindrical workpiece is immersed in the sealing treatment agent 4. Means capable of changing the angle to be operated are provided.
As a means for inclining the entire apparatus, as shown in FIG. 2 (a), the pedestal 14a provided with the above-described apparatus is placed in a horizontal state with the shaft 14c as a rotation axis from the fixed pedestal 14b serving as the foundation of the entire apparatus. Is moved up and down at an inclination angle θ. As a method of moving up and down, any method can be used as long as it can be moved up and down while adjusting the inclination angle θ, such as by rotation of a screw 14d connecting the base 14a and the fixed base 14b.

なお、上記式（１）中、ワークの幅寸法とはワークの軸方向の厚さ（mm）を示す。また、0 °≦θ＜ 90 °である。 The tilt angle θ can be set from a horizontal state to an angle calculated by the following equation (1).

In the above formula (1), the width dimension of the workpiece indicates the thickness (mm) of the workpiece in the axial direction. Further, 0 ° ≦ θ <90 °.

  As shown in FIG. 2A, when the entire apparatus is tilted by the angle θ, the shafts of the rotating roller 2 and the guide roller 3 are also tilted by the angle θ from the horizontal direction, and the cylinder supported by these two members. The shaped work 1 is also in a state where the axial direction is inclined by the angle θ. Since the liquid level 4a of the sealing agent 4 accommodated in the container 5 is kept horizontal even when the entire apparatus is tilted, if the cylindrical workpiece 1 is immersed in the sealing agent 4 in this state, FIG. ), The cylindrical workpiece outer diameter surface 1a is immersed at an angle θ with respect to the liquid surface 4a. As a result, one width surface 1d of the cylindrical workpiece 1 is immersed deeper than the liquid surface 4a, and the other width surface 1e is immersed shallowly. In this state, the cylindrical workpiece 1 is rotated.

By using the above-mentioned means, even when the outer ring of a bearing having different width dimensions on both width surfaces is sealed, a uniform sealing agent treatment surface is formed at a time on both the outer ring outer diameter surface and both width surfaces. it can.
Further, by controlling the inclination angle θ to change from the horizontal state to the angle calculated by the above formula (1), the sealing agent 4 is applied to unnecessary portions such as the inner diameter surface 1c of the cylindrical workpiece 1. Will not adhere.

  Further, the sealing treatment apparatus of the present invention includes means for adjusting the depth at which the cylindrical workpiece 1 is immersed from the liquid surface 4 a of the sealing treatment agent 4. A specific example will be described with reference to FIGS. FIGS. 3A to 3C are diagrams for explaining means for physically adjusting the immersion depth of the cylindrical workpiece 1. In each figure, the sealing housed in the container 5 is used in the sealing apparatus. It is the fragmentary sectional view seen from the front that the lower part of the cylindrical workpiece 1 was immersed in the hole treating agent 4. Hereinafter, the “predetermined depth” refers to a depth obtained by immersing the cylindrical workpiece outer diameter surface 1a from the liquid surface 4a of the sealing agent 4 to a desired surface depth.

An example of adjusting means for preventing the cylindrical workpiece 1 from being immersed in the sealing agent 4 beyond a predetermined depth will be described with reference to FIG.
In the adjusting means shown in FIG. 3A, an overflow discharge hole 15 is formed in the side surface of the container 5. When the cylindrical workpiece 1 is immersed in the sealing agent 4, when the sealing agent 4 in the container 5 reaches a certain amount, the cylindrical workpiece 1 is automatically discharged from the discharge hole 15 to the outside of the container 5. The depth immersed in the sealing agent 4 is limited.

  Further, if the bottom surface 5a inside the container 5 and the workpiece outer diameter surface 1a remain in contact with each other during the rotation of the workpiece, the rotation is hindered. For this reason, as shown in FIG. 3A, the discharge hole 15 is drilled from the bottom surface 5a inside the container 5 to a height obtained by “(predetermined depth d of the work to be dipped) + α”. Note that α is a length of 2 to 10% of the workpiece width dimension (mm) obtained by “{(workpiece outer diameter dimension) − (workpiece inner diameter dimension)} × 0.5”, and more preferably 5%. is there.

  Further, the container 5 having the discharge hole 15 may be used by replacing the cylindrical work 1 of different sizes and types, or the optimal discharge hole 15 for each cylindrical work 1. A structure in which a plurality of positions are formed in advance on the side surface of the container 5 and the holes can be accurately opened in advance using a jig may be used.

Another example of adjusting means for preventing the cylindrical workpiece 1 from being immersed in the sealing agent 4 beyond a predetermined depth is based on FIGS. 3 (b-1) to (b-2). I will explain.
In this adjusting means, when the cylindrical workpiece 1 is immersed in the sealing agent 4 accommodated in the container 5, a hard plate 16 having a predetermined thickness is submerged in the container 5 in advance, and the workpiece outer diameter is submerged. Immersion in the sealing agent 4 until the surface 1a contacts the hard plate 16 to limit the depth of immersion in the sealing agent 4 of the workpiece 1.

  The material of the hard plate 16 is preferably made of ceramic, which is not easily damaged even if it contacts the sprayed surface of the cylindrical workpiece 1. The thickness of the hard plate 16 is “(depth of sealing agent 4 accommodated in container 5) − (maximum possible immersion depth of workpiece)”. Note that the maximum possible immersion depth of the workpiece is the width surface dimension ({(workpiece outer diameter dimension) − (workpiece inner diameter dimension)} × 0.5) on the narrow side of the bearing width surface.

In addition, when the workpiece is rotated, if the upper surface 16a of the hard plate 16 placed on the bottom surface inside the container 5 and the workpiece outer diameter surface 1a remain in contact with each other, the workpiece rotation is hindered, so that the cylindrical workpiece 1 is sealed. The control of the moving device immersed in the treatment agent 4 includes (1) normal operation of immersing the workpiece in the sealing agent, and (2) after detecting that the workpiece outer diameter surface 1a is in contact with the hard plate 16 ( 3 (b-1)), two motions of moving by a predetermined distance α by a minute inversion operation and moving away from the contact state (FIG. 3 (b-2)). Here, the movement amount α due to the minute reversal operation shall be a length of 2 to 10% of the width dimension (mm) of the workpiece obtained by “{(workpiece outer diameter dimension) − (workpiece inner diameter dimension)} × 0.5”. Is preferred, and more preferably 5%.
For controlling these operations, the current value of the drive device of the housing 8a or 8b for controlling the vertical movement of the guide roller 3 supporting the container 5 or the cylindrical workpiece 1 or a limit switch can be used. .

An example for preventing the cylindrical workpiece 1 from being immersed in the sealing agent 4 without reaching a predetermined depth will be described with reference to FIG.
In this adjusting means, a load measuring device 17 such as a load cell is provided below the container 5 containing the sealing agent 4. When the cylindrical workpiece 1 is immersed in the sealing agent 4, the load detected by the measuring device 17 increases in proportion to the immersion depth. When the load value set in advance is reached, the driving device controls the movement of the cylindrical workpiece 1 or the container 5 to stop. The rotation of the workpiece 1 is controlled so as not to start until the detected load shows a certain value. By these controls, the immersion depth of the workpiece 1 in the sealing agent 4 is limited.

  Note that the means shown in FIG. 3C is not only for preventing the case where the immersion depth of the cylindrical workpiece 1 in the sealing agent 4 is less than the predetermined depth, but also exceeding the predetermined depth. It can also be used to prevent immersion.

By providing means for physically adjusting the immersion depth of the cylindrical workpiece as described above, the processing apparatus can be easily automated with respect to the sealing processing of the cylindrical workpiece such as the bearing outer ring. Processing can be performed quickly. In addition, since it is possible to set the immersion depth in the sealing treatment agent without using a complicated treatment agent quantification device having many drive parts, maintenance of the device is facilitated.
The sealing apparatus of the present invention is a means for changing the angle at which the outer peripheral surface of the cylindrical workpiece shown in FIG. 2 (a) is immersed in the sealing agent together with at least the sealing apparatus shown in FIG. 1 (b). And / or the means which adjusts the depth which the cylindrical workpiece | work shown to Fig.3 (a)-(c) immerses from the sealing agent surface can be used in combination, respectively.

  In the present invention, the combination of the sealing agent described below, which is excellent in impregnation property as a sealing agent, and the sealing device of the present invention, makes it possible to remove scratches on the rolling surface that are problematic in terms of product function. The apparatus can be automated without attaching foreign matter.

  The sealing agent that can be combined with the sealing device of the present invention contains an epoxy group-containing component and a curing agent, does not contain a polymerizable vinyl group-containing solvent, and the epoxy group-containing component is contained in one molecule. A polyglycidyl ether compound having 3 or more epoxy groups is an essential component, and at least selected from an alkylene diglycidyl ether compound and a cycloaliphatic diepoxy compound having 2 epoxy groups in one molecule. It is a mixture containing one, and is a sealing agent containing 10 to 80% by weight of a polyglycidyl ether compound based on the entire epoxy group-containing component excluding the curing agent.

A polyglycidyl ether compound and a cycloaliphatic diepoxy compound are compounds that do not contain a repeating unit formed by cleavage of an oxirane ring in the molecule. The mixture of the present invention reacts with a curing agent to form a cured product.
Examples of the polyglycidyl ether compound having 3 or more epoxy groups in one molecule include triglycidyl ether compounds and tetraglycidyl ether compounds.
Examples of the polyglycidyl ether compound include trimethylolpropane polyglycidyl ether, glycerol triglycidyl ether, and sorbitol polyglycidyl ether.
Among these, from the viewpoint of lowering the viscosity of the sealing agent, a triglycidyl ether compound is preferable, and trimethylolpropane polyglycidyl ether is particularly preferable.

  Examples of the alkylene diglycidyl ether compound having two epoxy groups contained in one molecule include neopentyl glycol diglycidyl ether, glycerol diglycidyl ether, polyethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, 1,6- Mention may be made of hexanediol diglycidyl ether.

The cycloaliphatic diepoxy compound having two epoxy groups contained in one molecule is a so-called alicyclic compound in which two adjacent carbon atoms form an oxirane ring. Examples of the alicyclic epoxy compound include alicyclic diepoxy compounds containing two oxirane rings, such as 1,2,8,9-diepoxy limonene. It is a preferred compound that effectively prevents the physical properties of the treated product from being lowered while lowering the viscosity of the sealing agent.
Further, diglycidyl ethers of alicyclic compounds such as hydrogenated bisphenol A and diglycidyl ether of tetrahydrophthalic acid can also be used.

The sealing agent that can be used in the present invention is a monoglycidyl ether compound having one epoxy group in one molecule for the purpose of improving the handleability and further improving the permeability to the spray coating material. Can be blended.
Examples of the monoglycidyl ether compound having one epoxy group contained in one molecule include known monoglycidyl ether compounds such as alkyl monoglycidyl ethers such as butyl glycidyl ether and alkylphenol monoglycidyl ethers.

The triglycidyl ether compound can be used as a sealing agent component that dramatically increases the adhesion between the thermal spray coating and the metal substrate. At the same time, since the viscosity of the compound itself is low, it is not necessary to add an organic solvent such as xylene and methyl ethyl ketone or a polymerizable vinyl group-containing solvent by mixing with a diglycidyl ether compound, which will be described later. In contrast, sufficient permeability can be imparted.
In addition, when the amount of chlorine ions contained in the resin is 0.5% by weight or less, it is possible to suppress deterioration of electrical characteristics such as insulation resistance in a humid atmosphere and corrosivity of the base material.
The viscosity of the triglycidyl ether compound at 25 ° C. is preferably 500 mPa · s or less. If it exceeds 500 mPa · s, the permeability is poor.

  The blending ratio of the triglycidyl ether compound is 10 to 80% by weight, preferably 20 to 50% by weight, based on the whole mixture. When the amount is less than 10% by weight, the viscosity of the sealing liquid itself can be set low, so that the permeability of the cured product is increased, but on the other hand, it is difficult to obtain the effect of improving the adhesion of the triglycidyl ether compound. The adhesive strength of is reduced. Further, when the blending ratio of the triglycidyl ether compound exceeds 80% by weight, the permeability of the sealing agent is increased, so that the permeability is poor.

  Since the alkylene diglycidyl ether compound having two epoxy groups contained in one molecule is an epoxy compound having a low viscosity in itself, the viscosity of the sealant may be reduced by addition to the polyglycidyl ether. This is preferable because it is possible. Addition of a cycloaliphatic diepoxy compound as shown in 1,2,8,9-diepoxy limonene is also preferred. Since these compounds are integrated by copolymerizing with epoxy molecules at the time of the curing reaction, it is preferable because the physical properties of the cured product can be prevented from being reduced by blending and the volume at the time of curing can be prevented.

The viscosity of the alkylene diglycidyl ether compound at 25 ° C. is preferably 30 mPa · s or less. If it exceeds 30 mPa · s, the viscosity of the sealant will increase, resulting in poor permeability.
The blending proportion of the alkylene diglycidyl ether compound is preferably 10 to 80% by weight, more preferably 50 to 80% by weight, based on the entire mixture. When it is less than 10% by weight, the effect of reducing the viscosity of the sealant is reduced, and the permeability of the sealant cannot be increased. On the other hand, if it exceeds 80% by weight, the permeability of the sealant increases, but the proportion of the triglycidyl ether compound, which has a role of forming a high-density crosslinked structure at the time of curing, decreases. The physical properties of the epoxy resin are reduced.

  The alkylene diglycidyl ether compound is mixed with the above-mentioned triglycidyl ether compound in a predetermined amount, so that the substrate adhesion force, molecular cross-linking density, and resin hardness of the triglycidyl ether compound itself can be sealed without significantly decreasing. By ensuring the penetration of the treatment agent, a sufficient function as a sealing treatment agent for thermal spray coating can be exhibited.

A monoglycidyl ether compound having one epoxy group contained in one molecule can be bonded to a part of the resin through a monofunctional group. In addition, since it is a low-viscosity epoxy compound itself, the viscosity of the sealing agent can be lowered, and on the other hand, it can reduce the residual stress inside the cured resin and provide an effect of adjusting the curing rate. it can.
It is preferable that the compounding quantity of a monoglycidyl ether compound shall be 0-50 weight% with respect to the whole mixture.
When the added amount of monoglycidyl ether compound exceeds 50% by weight, the amount of volatilization increases, the amount of triglycidyl ether compound decreases relatively, the crosslinking density of the resin after curing is insufficient, and the physical properties are greatly reduced. It becomes difficult to form a cured product. Moreover, since the compounding quantity of a polyglycidyl ether compound also reduces, the adhesive force between a thermal spray coating and a base material becomes small.

A curing agent is blended with the mixture of the glycidyl ether compounds. As the curing agent, acid anhydrides and amine compounds such as aliphatic amine compounds, alicyclic amine compounds and aromatic amine compounds, and known curing agents for epoxy resins such as imidazoles can be used. The acid anhydrides can be used alone or in combination. Amine compounds can be used alone or in combination.
Examples of the acid anhydrides include phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, benzophenone tetracarboxylic anhydride, ethylene glycol bistrimellitate, glycerol trislimitate, maleic anhydride, tetrahydrophthalic anhydride, methyltetrahydro Phthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, methylbutenyltetrahydrophthalic anhydride, succinic anhydride, dodecenyl succinic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, methylcyclohexene Examples thereof include dicarboxylic acid anhydrides and derivatives thereof.
Examples of amine compounds include chain aliphatic polyamines such as diethylenetriamine and triethylenetetramine, cyclic aliphatic polyamines such as N-aminoethylpiperazine and isophoronediamine, aliphatic aromatic amines such as xylylenediamine, metaphenylenediamine, and diaminodiphenylamine. And aromatic amines and derivatives thereof.
Of these, acid anhydride curing agents with a viscosity at 25 ° C of 50 mPa · s or less, and aliphatic amine curing agents with a viscosity at 25 ° C of 10 mPa · s or less, Since the viscosity can be remarkably lowered, it becomes a suitable curing agent.
In particular, an acid anhydride curing agent that can increase the pot life of the sealing agent and has a low shrinkage during curing is preferable.
It is preferable that the compounding quantity of an acid anhydride hardening | curing agent shall be 0.80-0.95 equivalent with respect to 1 equivalent of epoxy groups.

  A surfactant can be added as an additional material to the sealing agent that can be used in the present invention. Particularly effective surfactants include fluorine-based surfactants and silicone-based surfactants, and it is particularly preferable to use known fluorine-based surfactants. In the present invention, known anionic, cationic, nonionic and amphoteric surfactants can be used. When a fluorine-based surfactant is added to the sealing agent of the present invention, it can be used alone or in admixture of two or more. Moreover, if it is an additive which improves the surface active effect and the osmosis | permeation effect, such as silicone oil, it can be used in the range which does not disturb the characteristic of invention.

  As the anionic surfactant, sulfonate, sulfate, carboxylate, phosphate, phosphonate, phosphate ester and the like can be used. As the cationic surfactant, a quaternary ammonium salt, an amino halogen salt, or the like can be used. As the nonionic surfactant, polyoxyethylene ester type, polyoxyethylene ether type, sorbitan ester type and the like can be used. As the amphoteric surfactant, imidazoline type, betaine type and the like can be used.

(1) Preparation of bearing test piece Prepare a bearing outer ring (hereinafter referred to as bearing test piece 9) of a clear deep groove ball bearing 6316, and perform atmospheric plasma spraying so that the outer ring outer diameter and the film thickness of both width surfaces are about 400 μm. The alumina ceramic was sprayed by the method.

(2) Production of sealing agent The sealing agents used in Examples 1 to 5 and Comparative Examples 1 to 17 were prepared. Five kinds of sealing agents were prepared by varying specific raw material compositions. The materials used for the preparation are shown below. The following components were sufficiently stirred and mixed at room temperature with the composition shown in Table 1, and left for 30 minutes to remove bubbles in the mixed resin to obtain a sealing agent.
(A) Polyglycidyl ether compound Trimethylolpropane triglycidyl ether: manufactured by Nagase ChemteX Corporation, Denacol EX-321L, viscosity: 500 mPa · s (25 ° C.)
(B) Alkylenediglycidyl ether compound, manufactured by Japan Epoxy Resin Co., Ltd., YED216M, viscosity; 15 mPa · s (25 ° C.)
(C) Cycloaliphatic diepoxy compound Daicel Chemical Industries, Celoxide 3000, viscosity; 10 mPa · s (25 ° C.)
(D) Alkylene monoglycidyl ether compound, manufactured by Japan Epoxy Resin Co., Ltd., YED111E, viscosity; 7 mPa · s (25 ° C.)
(E) Polymerizable vinyl group-containing organic solvent Wako Pure Chemical Industries, Ltd., styrene monomer (reagent)
(F) Acid anhydride curing agent, manufactured by Dainippon Ink and Chemicals, Epicron B-570, viscosity: 40 mPa · s (25 ° C.)
(G) Imidazole-based curing accelerator, Shikoku Kasei Kogyo Co., Ltd., OR-2E4MZ

(3) Sealing treatment process The bearing test piece 9 was set in the sealing treatment apparatus shown in FIG. 1 using the sealing treatment agent, and the sealing treatment was performed using the sealing treatment agent.
In all of Examples 1 to 5 and Comparative Examples 1 to 15, the bearing test piece rotation speed was 0.03 rpm, the bearing test piece rotation time was about 33 minutes, and the total rotation speed of the bearing test piece was about 1 The rotation was performed under the condition of rotation. Further, the liquid level of the sealing agent was adjusted to a level at which almost the entire width surface of the bearing test piece was immersed. After the sealing treatment, preliminary baking was performed at 80 ° C. for 1 hour, and then baking was performed at 120 ° C. for 2 hours.
Table 2 shows the type of sealing agent used, the rotating roller guide position, the rotating roller material, and the presence or absence of the guide roller. In the “rotating roller guide position”, “groove bottom” refers to the “part in contact with the groove inner surface 1 b”, that is, the rolling surface of the bearing test piece 9, and “outer” refers to the inner diameter surface 1 c of the bearing test piece 9. In “Rotating roller material”, “Metal” is made of SUS303, and “Rubber” is silicone rubber (Shore hardness A80).
In Comparative Example 16, the sealing agent shown in FIG. 1 was not used, but the sealing agent was applied once to the surface of the sprayed surface of the bearing test piece using a polyester brush in a room temperature atmosphere. Let stand for a minute. Thereafter, preliminary baking was performed at 80 ° C. for 1 hour, and further baking was performed at 120 ° C. for 2 hours. In Comparative Example 17, the same coating as Comparative Example 16 was performed twice after preliminary baking at 80 ° C. for 1 hour, and then preliminary drying was performed at 120 ° C. for 2 hours.

(4) Evaluation of sealing treatment The obtained bearing test piece was evaluated by an insulation resistance measurement test and appearance (sealing treatment coating and rolling surface) observation. The results are shown in Table 2.
(4-1) Insulation Resistance Measurement Test FIG. 4 shows an outline of an insulation resistance test for the bearing test piece 9 having the sealed alumina ceramic sprayed coating 9a. Bearing test piece 9 is immersed in warm water at 80 ° C for 1 hour, wiped with a dry cloth, allowed to cool to room temperature, press-fitted into housing 10 with a tightening margin of 20 µm, and fixed with width surface fixing lid 11 with bolts. To do. The insulation resistance between the bearing test piece 9 and the housing 10 was measured using a 1000 V DC insulation resistance meter 13 attached to the wiring 12. The criterion was determined as “Yes (◯)” when the resistivity was 2000 MΩ or higher, and “No (×)” when the resistivity was lower than 2000 MΩ.

(4-2) Appearance (sealing treatment coating and rolling surface) observation When the sealing treatment agent adheres to a place other than the ceramic sprayed coating, the cured resin turns into the rolling surface (race) due to vibration during product transportation and bearing operation. May cause a bearing failure. Moreover, when the penetration depth of the sealing agent is not constant, a portion that is not sealed may be exposed depending on the polishing removal at the time of final grinding and the sealing property may be deteriorated. These problems are strictly prohibited in rolling bearings.
On the basis of the above criteria, the appearance of the bearing test piece 9 was observed after being left at 150 ° C. for 500 hours in order to make an accelerated evaluation under conditions where the actual machine was used. If the polishing surface is uniformly treated, the surface is uniformly light beige or light brown depending on the standing time at high temperatures. Appears prominently. If the ceramic sprayed film has no color unevenness and no scratches are seen on the rolling surface, it is “Yes”. If the ceramic sprayed film has color unevenness or scratches on the rolling surface, In the case where the sealing agent was adhered to a portion other than the sprayed film, it was determined that “impossible (×)” in any case. Also, if the cured resin is partially localized on the ceramic sprayed surface, it will increase the processing time in the polishing process, cause clogging of the grindstone, and cause variations in the dimensions of the outer diameter chamfered part. Therefore, it was determined as “impossible (×)”.
On the other hand, the appearance of the rolling surface is observed, and if the entire rolling surface has the same gloss as the part other than the peripheral part of the rotating roller and there are no scratches, “Yes (○)”, scratches on the rolling surface, etc. When it was seen, it was determined as “impossible (×)”.

  As shown in Examples 1 to 5, when the sealing treatment apparatus of the present invention is used and the sealing treatment is carried out using an optimum sealing treatment agent, good results are obtained in both insulation characteristics and appearance. It was. Moreover, the rotation accuracy of the bearing test piece was also good, and there were no rolling surface scratches and foreign matter adhesions that were problematic in product function.

  On the other hand, in Comparative Example 1, since the rotating roller is made of stainless steel (SUS303), the rolling contact surface and the rotating roller while biting foreign matter such as burrs and ceramic powder that are generated on the bearing test piece and exist on the rolling contact surface. Had a problem of scratching the race surface. Further, when the guide portion is outside the rolling surface, the risk of wrinkles on the rolling surface is avoided, but the bearing test piece is rotated accurately from the results of Comparative Examples 4, 5, 12, and 13. This makes it impossible to provide a predetermined rotational speed within a predetermined processing time, resulting in a sealing failure due to insufficient rotation.

  From the results of Comparative Examples 3 and 11, when sealing processing is performed only on a part of a cylindrical workpiece such as a bearing outer ring, when the guide position of the rotating roller is outside the rolling surface, if there is no guide roller, the workpiece Rotational accuracy cannot be ensured, and the sealing agent tends to adhere to or protrude from unnecessary parts. For this reason, when the guide position of the rotating roller is outside the rolling surface, the guide roller becomes an indispensable constituent member.

From the results of Comparative Examples 16 and 17, the brush coating method requires wiping with a liquid absorbing member such as a waste cloth or sponge after scraping with a polyethylene spatula to remove excess sealing agent. However, it is difficult to perform the wiping operation uniformly on all the parts, and it is difficult to automate the production. In addition, due to the low viscosity of the sealing agent at the time of firing, it is inevitable that the sealing agent present on the surface excessively gathers below the work and generates a liquid pool (sag). There is a problem that causes trouble.
Further, from the results of Comparative Examples 6, 14, and 15, the performance of the product is not the sealing agent composition suitable for the present invention even though the guide portion is the race surface groove bottom and the guide roller is provided. Is not demonstrated.

  The sealing agent coating apparatus of the present invention can reliably fill the voids in the ceramic spray coating formed on the outer peripheral surface of the cylindrical workpiece with the sealing agent by a simple method. For this reason, it can use suitably for an insulation bearing etc.

It is a figure explaining an example of the sealing processing apparatus of this invention. It is a figure explaining another example of the sealing processing apparatus of this invention. It is a figure explaining the means to adjust the immersion depth of a cylindrical workpiece. It is a figure which shows the outline of an insulation resistance test.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cylindrical workpiece 2 Rotating roller 3 Guide roller 4 Sealing agent 5 Sealing agent container 6 Bearing 7 Drive motor 8 Housing 9 Bearing test piece 10 Housing 11 Width surface fixed lid 12 Wiring 13 Insulation resistance meter 14 Base 15 Discharge Hole 16 Hard plate 17 Load measuring device

Claims (9)

A sealing agent coating apparatus for sealing a ceramic sprayed coating formed on the outer peripheral surface of a cylindrical workpiece having a groove in an inner diameter portion using a sealing agent,
Means for rotating and supporting the cylindrical workpiece by rotating and supporting the inner surface of the cylindrical workpiece with at least one rotating roller; and a sealing agent storage container movable in the vertical direction with respect to the cylindrical workpiece ; And a sealing agent coating apparatus , wherein the sealing agent container is disposed below the cylindrical workpiece.   The means for rotating the cylindrical workpiece includes: the rotating roller having an elastic body disposed on an outer peripheral surface of the roller; and at least one guide roller driven in contact with the inner diameter surface of the cylindrical workpiece. 2. The roller structure according to claim 1, wherein at least one of the rotating roller and the guide roller is in contact with the inner surface of the groove of the cylindrical workpiece, and an elastic body is disposed at a portion in contact with the inner surface of the groove. The sealing agent coating apparatus as described.   The sealing agent coating apparatus according to claim 1 or 2, wherein the rotary roller has an outer surface having an arcuate cross section in the axial direction.   The said sealing agent coating apparatus applies the outer peripheral part of the said cylindrical workpiece | work to the said sealing agent, and rotates the said rotation roller in this immersed state, The Claim 1 or Claim 2 characterized by the above-mentioned. The sealing agent coating device according to claim 3.   The said sealing agent coating device has a means to change the angle which the outer peripheral part of the said cylindrical workpiece | work immerses in the said sealing agent, The sealing agent coating device of Claim 4 characterized by the above-mentioned.   6. The sealing treatment according to claim 4, wherein the sealing agent coating device has means for adjusting a depth at which an outer peripheral portion of the cylindrical workpiece is immersed in the sealing agent. Agent applicator.   In the sealing agent coating apparatus, a gap having a length of 2 to 10% of a width dimension of the cylindrical workpiece is provided between an outer peripheral portion of the cylindrical workpiece and a bottom surface inside the sealing agent storage container. 7. The sealing according to claim 6, further comprising means for detaching the outer peripheral portion of the cylindrical workpiece, which is immersed in the sealing agent and is in contact with the bottom surface inside the container, by reversing operation. Treatment agent applicator.   The sealing agent contains an epoxy group-containing component and a curing agent, does not contain a polymerizable vinyl group-containing solvent, and the epoxy group-containing component has 3 or more epoxy groups contained in one molecule. A curing agent comprising a polyglycidyl ether compound as an essential component and containing at least one selected from an alkylenediglycidyl ether compound and a cyclic aliphatic diepoxy compound having two epoxy groups in one molecule. 8. The sealing agent according to claim 1, wherein the polyglycidyl ether compound is blended in an amount of 10 to 80 wt% with respect to the entire epoxy group-containing component excluding. Sealing agent coating device. A ceramic sprayed coating formed on an outer peripheral surface of a cylindrical workpiece having a groove in an inner diameter portion, using a sealing agent coating apparatus according to any one of claims 1 to 8, wherein the sealing treatment is performed. ,
Sealing treatment characterized in that the sealing agent is applied to and permeated into the outer peripheral portion of the cylindrical workpiece by rotating the rotating roller while the outer peripheral portion of the cylindrical workpiece is immersed in the sealing agent. Method.

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