JP7041509B2 - Fluorine grease application method - Google Patents

Description

The present invention relates to a method for applying fluorine grease, and more particularly to a method for applying fluorine grease to a sliding portion of a tire vulcanization container.

Since tire vulcanization molding is performed by applying heat and pressure to the green tire stored in the mold (vulcanization mold), in the tire vulcanization equipment, the mold is a tire vulcanization container (hereinafter, simply "container"). It is housed in (also called) and is configured to transfer heat and pressure from the container to the mold.

This container is composed of various members such as an upper mold plate, a lower mold plate, a sector shoe, and an actuator, and these members are slid with each other according to the opening and closing of the container. At this time, if the sliding in the sliding portion is non-uniform, the mold cannot be opened and closed uniformly, and rubber invades into the gap generated by the non-uniform sliding during vulcanization and burrs (overspew). : OV / SP) may occur. In addition, non-uniform sliding may cause wear of the sliding surfaces of each other, and the frequency of maintenance increases.

Therefore, in order to achieve uniform sliding of the container under such severe conditions of high temperature and high pressure, the container is conventionally made into a semi-solid state by adding a thickener to the base oil as a lubricant. It is generally applied to the sliding surface of the above.

Specific examples of the grease include fluorine grease using fluorine oil as the base oil because of its excellent load resistance and heat resistance (see, for example, Patent Document 1), and container sliding using such fluorine grease. A method for forming a sliding surface for forming a sliding surface of a moving portion has been proposed (see, for example, Patent Document 2).

Conventionally, the application of the fluorine grease to the sliding portion has been generally performed manually by brushing. Specifically, a small amount of fluorine grease is placed on the sliding part using a grease gun or the like and spread thinly on the sliding surface using a brush or the like, or grease diluted with a diluent is applied by brushing. Therefore, the fluorine grease was applied to the sliding portion.

Japanese Unexamined Patent Publication No. 2009-7425 Japanese Unexamined Patent Publication No. 2014-113717

However, the method in which the operator manually spreads the fluorinated grease by hand using a brush takes a lot of work time, and it is difficult to form a uniform coating film. In addition, there is a high safety risk to insert your hand into the opened container to perform the work.

Further, the method of applying the diluted grease by brushing has the following problems in addition to the above-mentioned problems. That is, the amount of the diluted solution varies depending on the operator, and since the diluted solution is volatile, the diluted solution evaporates during the work and the concentration changes. Therefore, uneven coating is likely to occur, and foreign matter may be mixed due to dripping. And if it hangs down on the floor, there is a safety risk such as slipperiness.

In addition, there is a problem that the brush coating cannot be applied to a narrow place or a deep place.

Therefore, according to the present invention, the uniform application of fluorine grease to the sliding portion of the container of the tire vulcanizer can be performed quickly, safely and efficiently, and further, it is easy even in a narrow place or a deep place. It is an object of the present invention to provide a technique for applying fluorine grease that can be applied to a tire.

The present inventor has conducted diligent studies and found that the above-mentioned problems can be solved by the invention described below, and has completed the present invention.

The invention according to claim 1 is
It is a method of applying fluorine grease to form a coating film of lubricant by applying fluorine grease to the sliding surface of the container sliding part of the tire vulcanizer.
A fluorine grease mixture containing a fluorine-based synthetic oil as a base oil and a fluorine resin as a thickener, a fluorine-based inert liquid, and a liquefied gas is stored in a spray container, and the fluorine grease mixture is placed in the spray container. By ejecting from the injection nozzle, it becomes an aerosol and becomes
By spraying and applying the aerosolized fluorine grease mixture onto the sliding surface of the container sliding portion, a coating film of the fluorine grease is formed on the sliding surface.
The method for applying fluorine grease is characterized in that a mixture of 65 to 85% by mass of the base oil and 15 to 35% by mass of the thickener is used as the fluorine grease.

The invention according to claim 2 is
It is a method of applying fluorine grease to form a coating film of lubricant by applying fluorine grease to the sliding surface of the container sliding part of the tire vulcanizer.
A fluorine grease mixture containing a fluorine-based synthetic oil as a base oil and a fluorine resin as a thickener, a fluorine-based inert liquid, and a liquefied gas is stored in a spray container, and the fluorine grease mixture is stored in the spray container. By ejecting from the injection nozzle, it becomes an aerosol and becomes
By spraying and applying the aerosolized fluorine grease mixture onto the sliding surface of the container sliding portion, a coating film of the fluorine grease is formed on the sliding surface.
As the fluorine-based inert liquid, any one of perfluoropolyether (PFPE), perfluorocarbon (PFC), hydrofluorocarbon (HFC), hydrofluoroether (HFE), hydrofluoroolefin (HFO), or two or more of them. This is a method for applying fluorocarbon, which is characterized by using a mixture of the above.

The invention according to claim 3 is
The fluorine grease mixture is 30 to 39% by mass of the base oil, 6 to 13% by mass of the thickener, 25 to 35% by mass of the fluorine-based inert liquid, and 20 to 25% by mass of the liquefied gas. The method for applying fluorine grease according to claim 1 or 2, wherein the composition is the same.

The invention according to claim 4 is
The method for applying fluorine grease according to any one of claims 1 to 3, wherein liquefied petroleum gas (LPG) is used as the liquefied gas.

The invention according to claim 5 is
The method for applying fluorine grease according to any one of claims 1 to 4, wherein the spray nozzle mounted on the spray container has a diameter of 0.8 to 2.0 mmφ. ..

The invention according to claim 6 is
One of claims 1 to 5, wherein the spray container having the injection nozzle formed in a long length of 50 to 300 mm is used to form a coating film of the fluorine grease on the sliding surface. The method for applying fluorine grease according to item 1.

The invention according to claim 7 is
The method for applying fluorine grease according to any one of claims 1 to 6, wherein perfluoropolyether (PFPE) is used as the base oil.

The invention according to claim 8 is
The claim is characterized in that any one of polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), and tetrafluoroethylene / perfluoroalkoxyethylene copolymer (PFA) is used as the thickener. The method for applying fluorine grease according to any one of claims 1 to 7.

The invention according to claim 9 is
A guide key having a T-shaped cross section in which the container sliding portion projects in the height direction of the actuator along the inner surface of the actuator is provided in the height direction of the sector shoe along the outer surface of the sector shoe. It is a container sliding part that slides by being engaged with a sector guide part consisting of a shaped groove.
By raising the actuator and lifting the sector shoe with the actuator, the upper part of the engagement portion of the guide key with the sector shoe guide portion is exposed, and the exposed sliding portion of the engagement portion faces the inner surface of the actuator. The method for applying fluorine grease according to any one of claims 1 to 8 , wherein a grease coating film is formed on almost the entire surface from the upper end to the lower end of the moving surface.

The invention according to claim 10 is
The method for applying fluorine grease according to any one of claims 1 to 9 , wherein the fluorine grease is applied to the container sliding portion located at the back of the guide metal.

According to the present invention, fluorine grease can be uniformly applied to the sliding portion of the container of the tire vulcanizer quickly, safely and efficiently, and even in a narrow place or a deep place. It is possible to provide a technique for applying fluorine grease that can be easily applied.

It is sectional drawing which shows typically the structure of the tire vulcanization apparatus. It is sectional drawing which shows the existence location of the container sliding part. It is a perspective view which shows typically the appearance of the main container sliding part to which grease is applied. It is a perspective view which shows the existence | location | region of the main container sliding part of the object of applying grease. It is a perspective view which shows typically the structure of the container sliding part between an actuator and a sector shoe.

[1] Background to the present invention As described above, the application of fluorine grease to the container sliding portion of the tire vulcanizer has conventionally been performed manually because the fluorine grease is in a semi-solid state. Although it was common, there were various problems, and it was required to improve the technique for applying fluorine grease to the tire vulcanizer.

Under such circumstances, the present inventor has conducted various experiments, and when the conventional fluorine grease is diluted with a diluent and made into an aerosol that can be spray-applied, uniform application can be performed quickly, safely and efficiently. It was found that the application can be easily applied even in a narrow place or a deep place, and it was found that the above problem can be solved. Further, this aerosolization can reduce the cost because the wasteful use of grease is reduced.

However, after that, further investigation revealed that in the conventional aerosolization of fluorine grease, the oil film was not sufficiently maintained when the sliding part to which it was applied was exposed to high temperatures, and only the fluororesin, which is a thickener, was used. Although a new problem of remaining in the form of powder on the sliding surface has occurred and the problem of improving workability can be solved, it was found that further improvement is necessary in terms of maintaining the coating film performance of the lubricant. rice field.

Therefore, as a result of further experiments and studies, the present inventor, when the fluorine grease having a high ratio of the base oil in the fluorine grease is made into an aerosol, the oil film is sufficiently maintained and the lubricant film is maintained. It was found that it was possible to improve workability and maintain the coating performance of the lubricant, and the present invention was completed.

[2] Embodiment of the present invention Next, an embodiment of the present invention will be described.

1. 1. Outline of the present embodiment The method for applying the fluorine grease according to the present embodiment is a mixture of fluorine grease using a fluorine-based synthetic oil as a base oil and a fluorine resin as a thickener, a fluorine-based inert liquid, and a liquefied gas. The fluorinated mixture is stored in a spray container, and the fluorinated grease mixture is blown out from the injection nozzle of the spray container to make it aerosolized, and the fluorinated fluorine grease mixture is sprayed onto the sliding surface of the sliding part of the container to be applied. As a result, a coating film of fluorine grease is formed on the sliding surface.

2. 2. Aerosolization of Fluorine Grease Prior to the description of a specific method for applying fluorine grease, first, the aerosolization of fluorine grease in the present embodiment will be described.

(1) Fluorine grease In the present embodiment, the fluorine grease is produced by using a fluorine-based synthetic oil as a base oil and a fluororesin as a thickener, and mixing them in a predetermined ratio.

In the present embodiment, the base oil has an excellent lubricating function, a small amount of evaporation after coating and an appropriate viscosity, a high oil film holding ability, and a chemical chemistry. An oil having excellent thermal stability and thermal stability is preferably used. Further, non-toxic and harmless oil is suitable.

As such a base oil, various fluorine-based synthetic oils containing fluorine in the molecule and having excellent heat resistance can be preferably used, and among them, perfluoropolyether (PFPE) is chemically stable and thermally stable. It is preferable because it is particularly excellent in sex.

The fluororesin as a thickener is a base oil such as polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene / perfluoroalkoxyethylene copolymer (PFA), and the like. A resin having good affinity with fluorosynthetic oil and having an excellent base oil retention function is preferably used.

The mixing ratio of the base oil in the fluorine grease is preferably 65 to 85% by mass (the remaining 15 to 35% by mass is a thickener). As a result, semi-fluid fluorine grease can be obtained, and when used on the sliding surface of the vulcanization container, the base oil of the fluorine grease is maintained until the periodic cleaning performed at predetermined intervals. Sufficient sustainability of the oil film after application can be ensured.

(2) Aerosolization A diluted solution is added to and mixed with the above-mentioned fluorine grease consisting of the base oil and the thickener to adjust the viscosity to an appropriate level, and then a predetermined amount of liquefied gas is mixed to obtain a fluorine grease mixture. By storing this fluorine grease mixture in a spray container, aerosolization in the present embodiment can be achieved.

As the diluent, a chemically inert, non-toxic and safe fluorine-based inert solution having a good affinity with the base oil and the thickener is preferably used. Specifically, any one of perfluoropolyether (PFPE), perfluorocarbon (PFC), hydrofluorocarbon (HFC), hydrofluoroether (HFE), hydrofluoroolefin (HFO), or a mixture of two or more thereof. Among these, a mixture of HFC and HFE is preferable.

The ratio of the fluorinated inert liquid in the fluorinated grease mixture is preferably 25 to 35% by mass.

Further, as the liquefied gas, a non-toxic and safe liquefied gas is used because it has a good affinity with the base oil and the thickener, is easily vaporized, and can obtain a sufficient spray pressure. Examples of such a liquefied gas include liquefied petroleum gas (LPG) composed of dimethyl ether, propane, normal butane, isobutane and a mixture thereof, and trans-1,3,3,3-tetrafluoropropa-1-ene (HFO-1234ze). ), Hydrofluoroolefins such as trans-2,3,3,3-tetrafluoropropa-1-ene (HFO-1234yf), and mixtures thereof. Among them, LPG is preferable because it is cheaper than other liquefied gases and has the property that the liquid is dissolved in the liquefied gas and can be uniformly injected at the time of injection.

The ratio of the liquefied gas in the fluorine grease mixture is preferably 20 to 25% by mass.

At this time, the ratio of the base oil in the fluorine grease mixture is preferably 30 to 39% by mass, and the ratio of the thickener is preferably 6 to 13% by mass.

By ejecting the fluorine grease mixture having the above composition from the injection nozzle of the spray container onto the sliding surface, an aerosolized fluorine grease coating film is uniformly formed on the sliding surface, and the oil film is maintained after application. Sufficient sex can be ensured.

3. 3. Long injection nozzle In this embodiment, a long injection nozzle can be used as the injection nozzle mounted on the spray container. By using such a long injection nozzle, it is preferable that the fluorine grease can be easily and uniformly applied to a narrow place or a deep place where the conventional brush coating operation cannot be performed.

As such an injection nozzle, a cylindrical resin tube can be preferably used, and the diameter thereof is preferably about 0.8 to 2.0 mmφ, more preferably about 1.5 mmφ. preferable. The length is preferably about 50 to 300 mm, more preferably about 100 to 150 mm. Specifically, a spray nozzle having a length of 100 mm, 120 mm, or 150 mm is preferable. It is preferable that the injection nozzle is detachable and expandable so that it can be appropriately replaced according to the application target portion.

4. Fluorine grease coating method according to the present embodiment Next, the method for applying the aerosolized fluorinated grease described above will be specifically described with reference to the drawings.

(1) Container sliding part First, the container sliding part to which fluorine grease is applied will be described.

1A and 1B are cross-sectional views schematically showing the configuration of a tire vulcanization apparatus, FIG. 1A shows a state in which a vulcanization mold (mold) is closed and vulcanization is performed, and FIG. 1B shows a state in which vulcanization is performed. The state where the mold is opened after vulcanization is shown. In FIG. 1, 1 is a tire vulcanizer and 5 is a mold. The mold 5 includes upper and lower side molds 2, 3 and a tread segment (segment) 4 divided in the circumferential direction, and is stored in a container. Note that T is a tire to be vulcanized.

As shown in FIG. 1, the container includes a sector shoe 9, an upper plate 6, and a lower plate 7. When the vulcanization in the closed state shown in FIG. 1 (a) is completed, as shown in FIG. 1 (b), the elevating table 13, the upper platen plate 12U, and the actuator 10 fixed to the platen plate 12U rise. It becomes an open state.

A guide key 17 (hereinafter, also referred to as “T guide”) is provided along the inner surface of the actuator 10 in the height direction. The T guide 17 is slidably engaged with a sector guide portion 16 provided in the height direction along the outer surface of the sector shoe 9, and when the actuator 10 rises, the T guide 17 is engaged with the sector guide portion 16. On the other hand, it slides upward. Along with this, the sector shoe 9 expands in diameter and moves toward the outside in the horizontal direction of the arrow, so that the bottom surface of the sector shoe 9 is fixed to the lower platen plate 12L. It slides with respect to the lower metal) 18, while the top surface slides with respect to the devar metal (metal on the container) of the upper plate 6. When the T guide 17 slides to the upper limit, the expansion of the diameter of the sector shoe 9 is stopped, and the sector shoe 9 and the upper plate 6 are suspended from the actuator 10 and move upward. On the other hand, during vulcanization, the actuator 10 is lowered, and the actuator 10 pushes the outer surface of the sector shoe 9 inward on the inner surface, thereby reducing the diameter of the sector shoe 9 and closing the sector shoe 9.

FIG. 2 is a cross-sectional view showing the location of the container sliding portion. 3A and 3B are perspective views schematically showing the appearance of the main container sliding portion to which grease is applied, FIG. 3A shows the inner surface of the actuator, and FIG. 3B shows the back surface of the sector shoe. It is shown, and (c) shows the appearance of the upper and lower plates on the devametal. Further, FIG. 4 is a perspective view showing a location of a main container sliding portion to which grease is applied.

In these figures, reference numeral 15 is a container back surface conical metal (conical metal) attached to the inner surface of the actuator 10, and reference numeral 17a is a guide metal attached to the engagement surface of the T guide 17 with the sector guide portion 16. Reference numeral 19 is a devar metal (metal on the container) of the upper mold plate, 20 is a slide metal, and 21 is a slide washer.

The sliding of the container is mainly due to the expansion and contraction of the sector shoe 9 when opening and closing the above-mentioned location, that is, the container (mold).

(2) Application of Fluorine Grease Next, application of fluorine grease at the above-mentioned sliding portion will be described. In the present embodiment, the fluorine grease is applied to the sliding surface by spraying the aerosolized fluorine grease onto the sliding surface.

In the present embodiment, the sliding surface of the container sliding portion described above, specifically, the devar metal (metal under the container) 18 of the lower mold plate, the devar metal (metal above the container) 19 of the upper mold plate, and the conical metal on the back surface of the container. Fluorine grease is applied to the sliding surfaces of each of the (conical metal) 15, the guide metal 17a, and the slide metal 20 at 18 locations.

As shown in FIG. 1 (b), the stroke of the actuator 10 in the vertical direction when opening and closing the container reaches about 300 mm. Therefore, the sliding distance of the container sliding portion shown in FIG. 3 is large, and a large load is applied.

Therefore, the sliding surface of the conical metal 15 installed on the inner surface of the actuator 10, the sliding portion between the sector guide portion 16 and the T guide 17, that is, the sliding surface of the guide metal 17a, the side surface of the T guide 17, and the top of the container. The application of grease to the sliding surfaces of the metal 19 (see FIG. 2) and the metal 18 under the container is particularly important.

On the other hand, since the sliding surface of these container sliding portions has a large area, it takes time and effort to form a coating film by the conventional working method, and it is difficult to form a uniform coating film without coating unevenness. rice field.

On the other hand, in the present embodiment, since the fluorine grease is aerosolized and applied by spraying, the time and effort for applying the grease to such a sliding surface is reduced and a uniform coating film without uneven coating is applied. Can be formed. In addition, wasteful use of grease can be suppressed.

Further, as shown in FIG. 1 (b), the grease is applied in a state where the container is lifted by the actuator 10 and the sliding surface of the container sliding portion is exposed as much as possible, but the sector guide portion 16 and the T guide are applied. Since the sliding surface of the sliding portion between 17 faces a narrow gap where brushes do not enter, it is difficult to apply grease to the sliding surface located deep in the gap by the conventional method. ..

FIG. 5 is a perspective view schematically showing the structure of the sliding portion between the actuator 10 and the sector shoe 9, and shows the size of the above-mentioned gap. By lifting the container, the upper part of the T guide 17 can be exposed from the sector guide portion 16 (see FIG. 3). However, since the distance between the exposed guide metal 17a and the inner surface of the actuator 10 facing the exposed guide metal 17a is only 12 mm, it is not possible to insert a brush. Therefore, in the conventional method, grease is applied to the deep part of the exposed portion of the guide metal 17a. Could not be applied.

On the other hand, in the present embodiment, by attaching a long injection nozzle and inserting it into the gap to spray, grease is uniformly applied to almost the entire exposed portion of the guide metal 17a in a short time. Can be done.

Further, the gap between the side surface of the T guide 17 and the side surface of the sector guide portion 16 is as small as 2 mm, but by mounting a long injection nozzle with a small diameter, the spray nozzle can be made into such a small gap. Since it can be inserted, grease can be evenly applied to the side surface of the T guide 17 and the lower part of the side surface of the sector guide portion, which was impossible in the past.

5. Effect of the present embodiment As described above, by aerosolizing the fluorine grease and spraying it on the sliding surface, the fluorine grease can be uniformly applied even by an unskilled person, so that uneven coating may occur. It can be suppressed and grease can be applied quickly and efficiently as compared with brush coating. Further, since the fluorine grease mixture is stored in the spray can in a predetermined formulation, it does not need to be diluted with a diluent, and the coating amount does not differ depending on the operator.

Specifically, the time for diluting with the diluent is about 20 minutes / day, and one container is not required, and the total time for brushing is about 12 hours / day, which can greatly contribute to the improvement of workability. I understood.

Further, by mounting an injection nozzle having a small diameter and a long length, it is possible to spray fluorine grease even in the depth of a narrow gap and apply it uniformly. As a result, it is possible to speed up the work and improve the efficiency. Further, by suppressing the uneven coating of grease, the occurrence of defects such as burrs due to the sliding defects of the container sliding portion is reduced.

In addition, when the sliding member is lifted to expose the sliding surface, it is safe to insert a lengthened injection nozzle from a distance without inserting a hand under the lifted sliding member. , Fluorine grease can be applied. Further, since the dripping on the floor surface does not occur as in the case of brush coating, it is possible to prevent the occurrence of a slip accident due to the dripping of the fluorine grease. Therefore, the safety risk is reduced.

Further, since the aerosol is stored in the spray container, it is possible to prevent foreign matter from entering the aerosol. Therefore, it is possible to apply grease so that the lubrication function is not impaired by the inclusion of foreign matter. Specifically, the number of cases of adhesion due to the inclusion of foreign matter has decreased to 1% or less.

Further, the aerosol makes it easier to control the thickness of the coating film as compared with the method of spreading a solid material, and does not form an excessively thick coating film. In addition, unlike the method of brushing the diluted solution, the material is not wasted due to dripping. Further, since the diluted solution does not evaporate, the concentration does not change during the grease application operation, and the material is not wasted. Therefore, the consumption of the material can be reduced. Specifically, the cost was reduced by about 20%.

Although the present invention has been described above based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above embodiments within the same and equal range as the present invention.

1 Tire vulcanizer 2, 3 Side mold 4 Tread segment (segment)
5 Mold 6 Upper plate 7 Lower plate 9 Sector shoe 10 Accuter 12U Upper platen plate 12L Lower platen plate 13 Elevator 15 Container back Conical metal (conical metal)
16 Sector guide 17 Guide key (T guide)
17a Guide metal 18 Deva metal of lower plate (metal under container)
19 Deva metal on the upper plate (metal on the container)
20 Slide Metal 21 Slide Washer T Tire

Claims (10)

It is a method of applying fluorine grease to form a coating film of lubricant by applying fluorine grease to the sliding surface of the container sliding part of the tire vulcanizer.
A fluorine grease mixture containing a fluorine-based synthetic oil as a base oil and a fluorine resin as a thickener, a fluorine-based inert liquid, and a liquefied gas is stored in a spray container, and the fluorine grease mixture is placed in the spray container. By ejecting from the injection nozzle, it becomes an aerosol and becomes
By spraying and applying the aerosolized fluorine grease mixture onto the sliding surface of the container sliding portion, a coating film of the fluorine grease is formed on the sliding surface.
A method for applying fluorine grease, which comprises using as the fluorine grease a mixture of 65 to 85% by mass of the base oil and 15 to 35% by mass of the thickener . It is a method of applying fluorine grease to form a coating film of lubricant by applying fluorine grease to the sliding surface of the container sliding part of the tire vulcanizer.
A fluorine grease mixture containing a fluorine-based synthetic oil as a base oil and a fluorine resin as a thickener, a fluorine-based inert liquid, and a liquefied gas is stored in a spray container, and the fluorine grease mixture is stored in the spray container. By ejecting from the injection nozzle, it becomes an aerosol and becomes
By spraying and applying the aerosolized fluorine grease mixture onto the sliding surface of the container sliding portion, a coating film of the fluorine grease is formed on the sliding surface.
As the fluorine-based inert liquid, any one of perfluoropolyether (PFPE), perfluorocarbon (PFC), hydrofluorocarbon (HFC), hydrofluoroether (HFE), hydrofluoroolefin (HFO), or two or more of them. A method for applying fluorocarbon, which comprises using a mixture of fluorocarbons. The fluorine grease mixture is 30 to 39% by mass of the base oil, 6 to 13% by mass of the thickener, 25 to 35% by mass of the fluorine-based inert liquid, and 20 to 25% by mass of the liquefied gas. The method for applying fluorine grease according to claim 1 or 2, wherein the composition is the same. The method for applying fluorine grease according to any one of claims 1 to 3, wherein liquefied petroleum gas (LPG) is used as the liquefied gas. The method for applying fluorine grease according to any one of claims 1 to 4, wherein the diameter of the injection nozzle mounted on the spray container is 0.8 to 2.0 mmφ. One of claims 1 to 5, wherein the spray container having the injection nozzle formed in a long length of 50 to 300 mm is used to form a coating film of the fluorine grease on the sliding surface. The method for applying fluorine grease according to item 1. The method for applying fluorine grease according to any one of claims 1 to 6, wherein perfluoropolyether (PFPE) is used as the base oil. The claim is characterized in that any one of polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), and tetrafluoroethylene / perfluoroalkoxyethylene copolymer (PFA) is used as the thickener. The method for applying fluorine grease according to any one of claims 1 to 7. A guide key having a T-shaped cross section in which the container sliding portion projects in the height direction of the actuator along the inner surface of the actuator is provided in the height direction of the sector shoe along the outer surface of the sector shoe. It is a container sliding part that slides by being engaged with a sector guide part consisting of a shaped groove.
By raising the actuator and lifting the sector shoe with the actuator, the upper part of the engagement portion of the guide key with the sector shoe guide portion is exposed, and the exposed sliding portion of the engagement portion faces the inner surface of the actuator. The method for applying fluorine grease according to any one of claims 1 to 8 , wherein a grease coating film is formed on almost the entire surface from the upper end to the lower end of the moving surface. The method for applying fluorine grease according to any one of claims 1 to 9 , wherein the fluorine grease is applied to the container sliding portion located at the back of the guide metal.

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