JP2014013036A - Swash plate for swash plate type compressor, method of manufacturing the same, and swash plate type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swash plate of a swash plate type compressor, capable of shortening a manufacturing process in comparison with a case when a conventional coating method is applied, polishing a resin coating with high accuracy, and securing adhesion strength with a swash plate base, a method for manufacturing the same, and the swash plate type compressor including the swash plate.SOLUTION: A swash plate 3 of a swash plate type compressor is provided in which a shoe is slid on the swash plate 3 disposed at a right angle or obliquely while directly fixed to a rotating shaft or indirectly through a connecting member in a housing in which a refrigerant exists, and rotating motion of the swash plate is converted into reciprocating motion of a piston through the shoe to compress and expand the refrigerant. A resin coating 10 is formed on a sliding face on which the shoe is slid, an axial cross-section of the resin coating 10 has a layered shape in a direction parallel with the sliding face, and the resin coating is formed by linearly applying a resin coating material 12 discharged from a discharge port 11 to a base 3a of the swash plate 3.

Description

  The present invention relates to a swash plate for a swash plate compressor used in an air conditioner and the like, a method for manufacturing the swash plate, and a swash plate compressor including the swash plate.

  In a swash plate compressor, a shoe is slid on a swash plate mounted at right angles and diagonally, either directly on a rotating shaft or indirectly through a connecting member in a housing where refrigerant is present, The rotary motion of the swash plate is converted into the reciprocating motion of the piston, and the refrigerant is compressed and expanded. Such swash plate compressors include a double swash plate type that compresses and expands refrigerant on both sides using a double-headed piston, and a single-slope that compresses and expands refrigerant only on one side using a single-headed piston. There is a board type. In addition, there are shoes that slide on only one side of the swash plate and those that slide on both sides of the swash plate.

  In these swash plate compressors, the metal swash plate and the shoe may slide in the initial stage of operation before the lubricant reaches the housing where the refrigerant is present. There is no dry lubrication and seizure is likely to occur.

  As a means for preventing this seizure, for example, a solid lubricant selected from a thermosetting resin, molybdenum disulfide and graphite via an intermediate layer on a sliding surface of a metal swash plate on which a shoe slides. The thing which formed the sliding contact layer containing is proposed (refer patent document 1). Further, both surfaces of the swash plate substrate obtained by pressing the rolled steel plate into a disk shape are polished to form sliding surfaces on which the shoe slides, and 40 to 50% by weight of fluororesin is blended on the sliding surfaces. A swash plate for a swash plate compressor in which a low friction resin coating layer is formed has been proposed (see Patent Document 2).

  These resin coatings are, for example, spray methods, electrostatic coating methods, screen printing methods, pad printing methods, roll methods, dipping methods, tumbling methods and the like as described in paragraph 0020 of Patent Document 1. It is formed by.

Japanese Patent Laid-Open No. 11-013638 JP 2009-209727 A

  In order to stabilize the friction and wear characteristics, the above resin film needs to be polished to improve the accuracy such as flatness after formation. However, the resin film of the swash plate formed by a conventionally known coating method has a problem that it is difficult to process with high accuracy by polishing. For example, in order to polish a thin resin film with high accuracy, a swash plate substrate as a base had to be processed with high accuracy. More specifically, it was necessary to polish the substrate with higher accuracy after turning. This complicates the manufacturing process of the swash plate and makes it difficult to meet the demand for reduction in manufacturing cost.

  In addition, even when the adhesion strength between the resin coating and the swash plate substrate is low, peeling occurs during polishing, and it is difficult to process the surface of the resin coating with high accuracy by polishing.

  In addition, along with the recent energy saving and light weight compactness of the entire device, the swash plate of the swash plate compressor has excellent low friction characteristics, wear resistance characteristics, adhesion strength of the resin coating, etc., and seizure and cavitation (occurred) It is required to prevent erosion due to impact due to bubble bursting).

  The present invention has been made to address these problems, and in the swash plate of a swash plate compressor provided with a resin coating, the manufacturing process can be shortened compared to the case of using a conventional coating method. An object of the present invention is to provide a swash plate compressor swash plate in which a resin coating can be polished with high accuracy and adhesion strength to a swash plate substrate is ensured, and a manufacturing method thereof, and a swash plate compressor including the swash plate. And

  The swash plate of the swash plate compressor according to the present invention slides a shoe on a swash plate attached at a right angle and obliquely so as to be directly fixed to a rotating shaft or indirectly through a connecting member in a housing in which refrigerant exists. A swash plate of a swash plate type compressor that compresses and expands the refrigerant by converting the rotational motion of the swash plate to reciprocating motion of the piston through the shoe, and the swash plate slides on the shoe A resin film is formed on the sliding surface, and an axial section of the resin film is layered in a direction parallel to the sliding surface. In particular, the resin film is a film formed by linearly applying a resin paint discharged from a discharge port to a swash plate substrate.

  The resin film is a film formed by concentrically applying the resin paint around the central axis of the swash plate or by applying the resin paint in a spiral shape. The resin paint is a drop-like resin paint.

  The swash plate base material is characterized in that a shot blasting process is performed on a portion to be a base immediately below the resin coating. Further, the swash plate base material is made of a disk-shaped steel plate obtained by pressing a rolled steel plate into a disk shape, and both the surfaces of the disk-shaped steel plate are turned and further subjected to the shot blast treatment. It is characterized by.

  The resin coating is characterized in that the coating surface is polished by a double-head polishing machine.

  The resin film is a resin film containing at least a fluororesin and graphite in a matrix resin. The resin coating contains 25 to 70 parts by weight of the fluororesin and 1 to 20 parts by weight of the graphite with respect to 100 parts by weight of the matrix resin, and the tensile shear adhesive strength of the resin coating (according to JIS K6850). Is 25 MPa or more.

  The method of manufacturing a swash plate for a swash plate compressor according to the present invention is a method of manufacturing a swash plate that is fixed at right angles and obliquely so as to be directly fixed to a rotating shaft or indirectly through a connecting member in a housing in which refrigerant is present. A method of manufacturing a swash plate for a swash plate compressor that compresses and expands a refrigerant by sliding a shoe and converting the rotational motion of the swash plate into a reciprocating motion of a piston through the shoe. A film forming step of forming a resin film on a sliding surface that slides on the shoe, and the film forming process applies a resin coating discharged from a discharge port in a linear manner to a swash plate substrate to form a film; It is a process to form.

  Before the coating film forming step, as a processing step for the swash plate substrate, both surfaces of the disk-shaped steel plate are applied to the swash plate substrate made of a disk-shaped steel plate obtained by pressing a rolled steel plate into a disk shape. A lathe process is performed, and a shot blasting process is performed on a portion to be a base immediately below the resin coating.

  In the swash plate compressor of the present invention, a shoe is slid on a swash plate attached at right angles and diagonally, directly fixed to a rotating shaft or indirectly through a connecting member in a housing where refrigerant exists. A swash plate compressor that compresses and expands the refrigerant by converting the rotational motion of the swash plate into reciprocating motion of the piston through the shoe, wherein the swash plate of the present invention is used as the swash plate. .

  The swash plate of the swash plate compressor of the present invention has a resin film formed on a sliding surface that slides with a shoe, and the axial cross section of the resin film is layered in a direction parallel to the sliding surface. Therefore, it is possible to prevent peeling at the interlayer portion during sliding contact with the shoe, and a continuous film is formed in the sliding contact direction with the shoe and the sliding property with the shoe is excellent. In addition, this resin film is a film formed by linearly applying a resin paint discharged from the discharge port to the swash plate base material, so that the adhesion strength with the swash plate base material is high, and it is peeled off during polishing processing. Does not occur. Therefore, the surface of the resin coating can be polished with high accuracy.

  Since the resin coating is a coating formed by applying the resin coating concentrically or spirally to the central axis of the swash plate, the axial cross section of the resin coating is slid. A structure that is layered in a direction parallel to the moving surface can be easily formed. Moreover, a continuous film is formed along the sliding contact direction with the shoe, and the sliding contact with the shoe is excellent. In particular, by applying in a spiral shape, the whole can be applied without any breaks, and no slight unevenness is produced, so that the sliding contact with the shoe is very excellent.

  Since the resin paint is a drop-like resin paint, the discharge pressure can be set higher than when the resin paint is applied continuously, so that the resin paint bites into minute irregularities on the surface of the swash plate substrate. Applied. Therefore, the adhesion strength with the swash plate substrate can be further increased.

  Since the swash plate base material is subjected to shot blasting at a base portion immediately below the resin coating, it has excellent adhesion strength to the resin coating without providing an intermediate layer such as a metal sprayed layer. Further, the manufacturing of the swash plate can be simplified, and the manufacturing cost can be reduced.

  The swash plate base material is a disk-shaped steel plate obtained by pressing a rolled steel plate into a disk shape, and both the surfaces of the disk-shaped steel plate are lathe-processed and further subjected to the shot blast treatment. Thereby, the adhesion strength with the resin film can be improved, and the finishing accuracy of the swash plate is suitably affected. In addition, the precision polishing after the lathe processing, which has been conventionally required, can be omitted.

  Since the coating surface of the resin coating is polished (finished) by a double-head polishing machine after the coating is formed, the parallelism of both surfaces of the swash plate sliding surface can be processed with high accuracy.

  The resin film is excellent in the low friction characteristic and the wear resistance characteristic of the resin film because the resin film containing at least a fluororesin and graphite is formed on the matrix resin. Further, the resin coating contains 25 to 70 parts by weight of fluororesin and 1 to 20 parts by weight of graphite with respect to 100 parts by weight of the matrix resin, and the resin film has a tensile shear bond strength of 25 MPa or more. The coating film is excellent in low friction characteristics and wear resistance, and the resin film has high tensile shear adhesive strength, and the adhesion strength of the film to the swash plate substrate is also high. For this reason, it can be used for the swash plate type compressor whose surface pressure received by the swash plate is 10 MPa or more without peeling off the resin film. Furthermore, it has excellent cavitation resistance and can prevent erosion of the resin film due to cavitation in the presence of lubricating oil.

  The method of manufacturing a swash plate for a swash plate compressor according to the present invention includes a film forming step of forming a resin film on a sliding surface that slides with a shoe of the swash plate, and the film forming step is discharged from a discharge port. Since this is a process of forming a film by linearly applying a resin coating to a swash plate substrate, it can form a resin film with excellent adhesion strength to the swash plate substrate, and can be applied with conventional coating methods such as spray coating. Productivity and yield can be improved as compared with the case of employing. Further, it is easy to increase the thickness of the film, and it is not necessary to process the swash plate substrate with high accuracy, and the manufacturing process of the swash plate can be shortened. As a result, the manufacturing cost can be reduced as compared with the case where the conventional coating method is adopted.

  Since the swash plate compressor of the present invention includes the above-described swash plate, the swash plate compressor has sufficient adhesion strength of the resin coating while being able to be manufactured at a low cost as compared with the case of employing a conventional coating method. . In addition, even when a small-diameter shoe is in a state of local contact, or when an inexpensive shoe such as SUJ2 whose surface is not specially processed is used, even when the lubricating oil is depleted, seizure resistance is improved. It is an excellent swash plate compressor that can avoid trouble caused by seizure of the swash plate, and is safe and has a long service life. Moreover, since it can be used also for high surface pressure specifications, it is suitable for the one using carbon dioxide gas or HFC1234yf as a refrigerant.

It is a longitudinal cross-sectional view which shows an example of the swash plate type compressor of this invention. It is sectional drawing which expands and shows the swash plate of FIG. It is a partially cutaway side view of the swash plate of FIG. It is a figure which shows the formation process of a resin film. It is a figure which shows the formation process of a resin film (it uses a drop-like resin coating material). It is a partially expanded view which shows the structure of a resin film.

  An embodiment of a swash plate compressor according to the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an example of a swash plate compressor of the present invention. The swash plate type compressor shown in FIG. 1 uses carbon dioxide gas as a refrigerant. The swash plate 3 attached obliquely so as to be directly fixed to the rotary shaft 2 in the housing 1 in which the refrigerant exists is inclined. The reciprocating motion of the double-headed piston 5 is converted through the shoes 4 that slide on both sides of the plate 3, and the refrigerant is supplied to both sides of each piston 5 in the cylinder bore 6 formed at equal intervals in the circumferential direction of the housing 1. A swash plate type that compresses and expands. The rotary shaft 2 that is rotationally driven at high speed is supported by a needle roller bearing 7 in the radial direction and supported by a thrust needle roller bearing 8 in the thrust direction.

  The swash plate 3 may be fixed to the rotary shaft 2 indirectly via a connecting member. Moreover, the aspect attached rather than diagonally may be sufficient. The main feature of the swash plate of the swash plate compressor according to the present invention is that it has a resin film having a predetermined structure obtained by coating and forming on the sliding surface with the shoe by a predetermined method. It can also be applied to the swash plate type compressor.

  Each piston 5 is formed with a recess 5a so as to straddle the outer periphery of the swash plate 3, and a hemispherical shoe 4 is seated on a spherical seat 9 formed on the axially opposed surface of the recess 5a. 5 is supported so as to be movable relative to the rotation of the swash plate 3. Thereby, the conversion from the rotational movement of the swash plate 3 to the reciprocating movement of the piston 5 is performed smoothly. If necessary, the surface of the shoe 4 may be subjected to processing for improving sliding characteristics such as nickel plating.

  As shown in FIGS. 2 and 3, the base material 3a of the swash plate 3 is made of a disk-shaped steel plate obtained by pressing a rolled steel plate into a disk shape. Shot blasting is performed on the surfaces of both surfaces of the disk-shaped steel plate that are lathe-processed, and a resin film 10 having low friction characteristics is formed thereon by a predetermined method described later. Both surfaces of the base material 3a are sliding surfaces with the shoe 4 (see FIG. 1).

  The resin coating 10 is processed with high accuracy by polishing. The polishing process is performed using a double-head polishing machine, so that the parallelism of both surfaces of the swash plate can be processed with high accuracy. As a polishing method using a double-head polishing machine, for example, a drive-type double-head polishing method in which the upper and lower surfaces serving as sliding surfaces are simultaneously polished with a grindstone while rotating while maintaining the axis center of the disk-shaped steel plate can be employed. . By these polishing processes, the planar accuracy of the surface of the swash plate is improved.

  In the base material 3a of the swash plate 3, by performing shot blasting on the base portion immediately below the resin coating, the adhesive strength with the resin coating is excellent and the peeling is reduced without providing an intermediate layer such as a metal sprayed layer. . Further, by not forming the sprayed layer, it is possible to reduce the manufacturing cost and prevent the flatness of the swash plate from being lowered.

  The structure of the resin coating 10 will be described with reference to FIG. FIG. 6A is an axial sectional view (partially enlarged) of the resin coating, and FIG. 6B is a plan view (partially enlarged) of the resin coating. As shown in FIG. 6A, the resin coating 10 has a layer shape in which a plurality of layers are overlapped in a direction (arrow A in the drawing) in which the axial cross section is parallel to the sliding surface 3b. That is, the interlayer part 10a is standing substantially perpendicular to the sliding surface 3b. The “layered shape” includes the case where there is a portion in which adjacent layers are almost completely integrated in the vicinity of the sliding surface or the like due to the properties of the resin coating. In the case of a multi-layer coating in which a plurality of layers are stacked in a direction perpendicular to the sliding surface 3b, there is a concern about peeling at the interlayer when sliding on the shoe. Can be eliminated. Further, as shown in FIG. 6B, the interlayer portion 10a of the resin coating 10 is formed along the sliding contact direction (arrow B in the figure) with the shoe. For this reason, the sliding contact with the shoe is excellent.

  The composition of the resin coating 10 is preferably a composition containing at least a fluororesin and graphite in the matrix resin. More specifically, it contains 25 to 70 parts by weight of a fluororesin and 1 to 20 parts by weight of graphite with respect to 100 parts by weight of the matrix resin, and the tensile shear bond strength (based on JIS K6850) of the resin film is 25 MPa or more (preferably Is preferably 30 MPa or more. By forming such a resin film on the swash plate 3, the resin film can be used without peeling even when the surface pressure received by the swash plate is 10 MPa or more, low friction characteristics, wear resistance characteristics, coating adhesion strength, and The cavitation resistance in the presence of lubricating oil can be satisfied in a well-balanced manner.

  As the matrix resin, any heat-resistant resin can be used as long as it has heat resistance that does not cause thermal deterioration during use of the swash plate, and can bind the fluororesin and firmly adhere the resin film to the swash plate substrate. Can be used. Examples of the matrix resin include polyphenylene sulfide resin, polyether ether ketone resin, polyimide resin, polyamide resin, polyamideimide (PAI) resin, epoxy resin, and phenol resin. Among these, it is preferable to use a PAI resin because of excellent heat resistance, wear resistance, and adhesion to a swash plate substrate.

  The PAI resin is a resin having an imide bond and an amide bond in the polymer main chain. Among the PAI resins, an aromatic PAI resin in which an imide bond and an amide bond are bonded via an aromatic group is preferable. When it is an aromatic PAI resin, it is excellent in the binding property with the swash plate substrate as a base, and the heat resistance of the resulting resin film is particularly excellent. Here, the imide bond of the aromatic PAI resin may be a precursor such as polyamic acid, a closed imide ring, or a state in which they are mixed.

  Such aromatic PAI resins include PAI resins produced from aromatic primary diamines such as diphenylmethanediamine and aromatic tribasic acid anhydrides, such as mono- or diacyl halide derivatives of trimellitic acid anhydride, aromatic There are PAI resins produced from tribasic acid anhydrides and aromatic diisocyanate compounds such as diphenylmethane diisocyanate. Furthermore, as a PAI resin having a larger ratio of imide bonds than amide bonds, it is produced from aromatic, aliphatic or alicyclic diisocyanate compounds and aromatic tetrabasic acid dianhydrides and aromatic tribasic acid anhydrides. Any PAI resin can be used.

Any fluororesin can be used as long as it has low friction, can impart non-adhesiveness to the resin film, and has heat resistance to withstand the operating temperature atmosphere of the swash plate. Examples of the fluororesin include polytetrafluoroethylene (PTFE) resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer resin, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer resin, and tetrafluoroethylene. -Ethylene (ETFE) copolymer resin etc. are mentioned. Among these, it is preferable to use PTFE resin powder. PTFE resin has a high melt viscosity of about 10 ¹⁰ to 10 ¹¹ Pa · s at about 340 to 380 ° C., hardly flows even when the melting point is exceeded, has the highest heat resistance among fluororesins, and is excellent even at low temperatures It exhibits properties and excellent friction and wear characteristics.

The PTFE _{resin, - (CF 2 -CF 2)} n- in can be used ordinary PTFE resin represented, also generally of PTFE resin perfluoroalkyl ether group _{(-C p} F 2p -O- ) (P is an integer of 1-4) or a modified PTFE resin into which a polyfluoroalkyl group (H (CF ₂ ) _q- ) (q is an integer of 1-20) or the like is introduced. These PTFE resins and modified PTFE resins may be obtained by employing either a suspension polymerization method for obtaining a general molding powder or an emulsion polymerization method for obtaining a fine powder.

  The average particle diameter (measured value by laser analysis method) of the PTFE resin powder is not particularly limited, but is preferably 30 μm or less in order to maintain the surface smoothness of the resin coating.

  As the PTFE resin powder, a PTFE resin obtained by heating and baking at a melting point or higher can be used. Further, a powder obtained by further irradiating a heat-fired powder with γ rays or electron beams can also be used. These PTFE resin powders are more excellent in uniform dispersibility in the resin coating that forms the resin film than PTFE resins (molding powder, fine powder) that are not heated and fired, and the resistance of the formed resin film. Excellent wear characteristics.

  The fluororesin such as the PTFE resin is preferably blended in an amount of 25 to 70 parts by weight with respect to 100 parts by weight of the matrix resin in the resin film. When the blending amount of the fluororesin is less than 25 parts by weight, the low friction characteristic is deteriorated, and there is a possibility that the wear is accelerated due to heat generation. In addition, workability during coating is also deteriorated. On the other hand, if the blending amount of the fluororesin exceeds 70 parts by weight, the low friction characteristics are excellent, but the coating strength and wear resistance characteristics deteriorate, and there is a risk of abnormal wear under extreme pressure when the sliding shoe comes into contact with one piece. . In particular, when the blending amount of the fluororesin is 40 to 50 parts by weight, the tensile shear adhesive strength exceeds 35 MPa, and a sufficient safety factor against the extreme pressure reduction condition per piece of shoe that comes into sliding contact can be sufficiently secured. The amount of the fluororesin exceeds 70 parts by weight with respect to 100 parts by weight of the matrix resin is a case where it exceeds about 40% by weight when converted to the content of the fluororesin in the resin film.

  It is well known that graphite has excellent properties as a solid lubricant, and it is also used as a solid lubricant for swash plates. Graphite is roughly classified into natural graphite and artificial graphite. The shape includes flakes, granules, and spheres, but any of them can be used. Artificial graphite is generally considered unsuitable for lubricants because it is difficult to make graphite with sufficiently advanced graphitization because it is difficult to make lubrication due to carborundum produced during the manufacturing process. ing. Since natural graphite is produced that is completely graphitized, it has very high lubricating properties and is suitable as a solid lubricant. However, since the impurity contains a lot of impurities and this impurity lowers the lubricity, the impurities must be removed, but it is difficult to completely remove them.

  As the graphite, graphite having 97.5% or more of fixed carbon is preferably used, and artificial graphite having 98.5% or more of fixed carbon is more preferable. Such graphite has high compatibility with the lubricating oil, and even if the lubricating oil does not adhere to the surface, the lubricating property is maintained by the lubricating oil impregnated in a trace amount in the graphite.

  The graphite is preferably blended in an amount of 1 to 20 parts by weight with respect to 100 parts by weight of the matrix resin in the resin coating for the purpose of improving frictional wear characteristics. When the amount of graphite is less than 1 part by weight, the effect of improving the friction and wear characteristics when graphite is blended is not recognized. On the other hand, if the blending amount of graphite exceeds 20 parts by weight, the adhesion of the coating is impaired, and there is a risk of peeling. If the total amount of additives such as fluororesin and graphite with respect to the matrix resin is less than 15 parts by weight, unevenness occurs in the resin film, making it difficult to obtain the required dimensional accuracy.

  The resin film may contain other additives in addition to the matrix resin, fluororesin, and graphite as long as the required characteristics of the swash plate of the present invention are not significantly reduced. In addition, it is possible to obtain the best balance among the low friction characteristics, the wear resistance characteristics, and the cavitation resistance when it is formed substantially by three components of a matrix resin, a fluororesin, and graphite.

  In the resin coating, the matrix resin is PAI resin, the fluororesin is PTFE resin, and the graphite is graphite with fixed carbon of 97.5% or more, so that each is easily available and relatively inexpensive, The manufacturing cost of the swash plate can be reduced.

  As compressors become lighter and smaller, the swash plate itself becomes smaller, and high-speed, high-load specifications are required to maintain high output. Since cavitation is likely to occur during high-speed and high-load operation in lubricating oil, the resin film is required to have cavitation resistance so that erosion due to cavitation does not occur. In order to maintain cavitation resistance, it is necessary to increase the blending ratio of the PAI resin, which is a matrix resin, with respect to the solid lubricant. When the blending amount of the fluororesin exceeds 70 parts by weight, the blending ratio of the matrix resin that plays the role of the binder becomes small, and the cavitation resistance is not sufficient. In addition, if the total amount of additives such as fluororesin and graphite exceeds 90 parts by weight with respect to 100 parts by weight of the matrix resin, erosion of the film due to cavitation tends to occur, but if it is less than that, cavitation resistance is ensured. desirable.

  The method for manufacturing a swash plate for a swash plate compressor according to the present invention includes a film forming process for forming the above-described resin film on a sliding surface that slides with a shoe of the swash plate. This is characterized in that it is a step of forming a film by linearly applying the resin paint to the swash plate substrate.

  A method for forming the resin coating 10 will be described with reference to FIGS. FIG. 4 is a view showing a case where the resin paint is continuously discharged, and FIG. 5 is a view showing a case where the resin paint is a drop-like resin paint. Note that the drop-like resin paint is a paint in which the resin paint is intermittently connected in a single drop, like the resin paint 12 in FIG. 5, and is continuously like the resin paint 12 in FIG. 4. The paint is distinguished from the paint in a discharged state. 4 and 5, the resin coating 10 is formed by linearly applying a resin coating 12 discharged from the discharge port 11 of the liquid dispensing apparatus to the base material 3 a of the swash plate 3. To apply linearly, the resin paint 12 is discharged from the discharge port 11 while the discharge port 11 is moved relative to the base material 3a and continuously connected with a certain width corresponding to the discharge port size. Forming a coated part. As a method of moving the discharge port 11 relative to the base material 3a, for example, the base material 3a may be installed on an XY table and the base material 3a may be moved with respect to the discharge port 11, or The reverse may be possible, or the discharge port 11 and the substrate 3a may be moved. A needle nozzle is mainly used as the discharge port, and a round shape, a flat shape, a rectangular shape, or the like is used. The base material 3a is not exposed on the sliding surface by applying it linearly with no gap to the sliding surface of the base material 3a.

  As a method of applying the resin coating 12 linearly without a gap, (1) a method of concentrically applying the resin coating 12 with respect to the central axis of the swash plate, or (2) a method of applying the material in a spiral shape can be employed. By applying by such a method, the resin film having the structure shown in FIG. 6 can be easily formed, and a continuous film is formed along the sliding contact direction with the shoe. Is excellent. In particular, in the method (2), since the whole can be applied without any breaks and slight unevenness does not occur, the sliding contact with the shoe is very excellent. In addition, the resin paint 12 can be formed by linear application. In this case, by polishing the surface of the swash plate in accordance with the direction of application of the resin paint 12, polishing can be performed with high accuracy.

  The resin coating is obtained by dispersing or dissolving the above-described matrix resin, fluororesin, graphite and the like, which are solid contents, in a solvent at a predetermined blending ratio. The resin paint is discharged continuously or in drops by a liquid dispensing apparatus. Solvents include ketones such as acetone and methyl ethyl ketone, esters such as methyl acetate and ethyl acetate, aromatic hydrocarbons such as toluene and xylene, and organic halogenated compounds such as methyl chloroform, trichloroethylene, and trichlorotrifluoroethane. Aprotic polar solvents such as N-methyl-2-pyrrolidone (NMP), methylisopyrrolidone (MIP), dimethylformamide (DMF) and dimethylacetamide (DMAC) can be used. These solvents can be used alone or as a mixture. The viscosity of the resin coating is preferably adjusted to about 1000 to 10000 mPa · s.

  In the above method according to the present invention, the resin paint is applied to the swash plate substrate by discharging it at a predetermined discharge pressure. Therefore, compared with the case where a conventional coating method such as a spray coating method is adopted, productivity and Yield can be improved. In particular, with respect to the spray coating method, there is little waste of paint, and a thick film can be formed in a short time. Even if the flatness of the base material is inferior due to the increase in thickness, it can be absorbed on the resin film side and the flatness of the resin surface can be ensured. Eliminates the need for processing with precision. For example, in the case of adopting the conventional spray coating method, since the resin film becomes a thin film, it is necessary to perform further high-precision polishing after turning the base material. Processing can be omitted. As a result, the manufacturing process of the swash plate can be shortened and the manufacturing cost can be reduced.

  In addition, as shown in FIG. 5, by applying a droplet-shaped resin paint to a swash plate substrate by discharging and colliding with a predetermined discharge pressure, the paint can easily enter minute unevenness on the surface of the substrate. The adhesion strength between the plate base material and the resin coating becomes higher. For this reason, peeling or the like does not occur in the polishing process of the resin film, and the resin film can be polished with high accuracy.

  A resin coating is applied to the swash plate substrate in a linear form and then baked to obtain a cured and adhered resin coating. This resin film has a thickness of about 40 μm to 60 μm after firing. This resin film having a film thickness of 40 μm to 60 μm can be processed into a film thickness of 8 μm to 30 μm by a double-head polishing machine to obtain a final finishing accuracy of 15 μm or less in flatness and 15 μm or less in parallelism. Since the resin coating is polished (finished) by a double-head polishing machine, the parallelism of both surfaces of the swash plate sliding surface can be processed with high accuracy. The flatness and parallelism in the present invention are defined by JIS B0182.

  The surface roughness of the resin film can be changed depending on the count of the polishing grindstone, and is preferably adjusted to 0.1 to 1.0 μmRa. By setting it within this range, the real contact area on the sliding surface of the resin film sliding with the shoe is increased, the actual surface pressure can be lowered, and seizure can be prevented. If the surface roughness is less than 0.1 μmRa, the lubricating oil is insufficiently supplied to the sliding surface. If the surface roughness exceeds 1.0 μmRa, the surface area of the sliding surface is reduced, resulting in high local pressure and seizure. There is a fear. More preferably, the surface roughness is 0.2 to 0.8 μmRa. The surface roughness Ra in the present invention is defined by JIS B0601.

  In addition, when polishing is performed after turning the underlying swash plate base material, the flatness of the base material is also excellent, so that the uniformity of the resin film is ensured and a stable boundary lubrication state with the lubricating oil is realized. Even when the lubricating oil is depleted, the friction and wear characteristics can be stabilized in the boundary lubrication state.

  Since the swash plate type compressor of the present invention is provided with the swash plate as described above, it is inexpensive such as when the small-diameter shoe is in a locally contacted state or when the surface is not specially processed. Excellent seizure resistance even when using shoes or when lubricating oil is exhausted. In addition, erosion of the coating due to cavitation can be prevented in the presence of lubricating oil at high surface pressure and high speed. Furthermore, the manufacturing cost can be reduced.

  The swash plate of the swash plate compressor of the present invention can shorten the manufacturing process compared with the case where the resin film is formed by a conventional coating method, and the resin film formed on the sliding surface is polished with high accuracy. Since it can be processed and has excellent adhesion strength with the swash plate base material, it can be suitably used in a recent swash plate type compressor that uses carbon dioxide or the like as a refrigerant and has a high-speed and high-load specification.

DESCRIPTION OF SYMBOLS 1 Housing 2 Rotating shaft 3 Swash plate 3a Base material 3b Sliding surface 4 Shoe 5 Piston 5a Recessed part 6 Cylinder bore 7 Needle roller bearing 8 Thrust needle roller bearing 9 Spherical seat 10 Resin coating 10a Interlayer part 11 Discharge port 12 Resin paint

Claims (11)

In the housing where the refrigerant exists, the shoe is slid to a swash plate attached at right angles and obliquely so as to be directly fixed to the rotating shaft or indirectly through a connecting member, and the swash plate is passed through the shoe. Is a swash plate of a swash plate type compressor that compresses and expands the refrigerant by converting the rotational motion of
The swash plate has a resin film formed on a sliding surface that slides with the shoe,
A swash plate for a swash plate compressor, wherein an axial section of the resin coating is layered in a direction parallel to the sliding surface.   2. The swash plate for a swash plate compressor according to claim 1, wherein the resin coating is a coating formed by linearly applying a resin paint discharged from a discharge port to a swash plate substrate.   The said resin film is a film formed by apply | coating the said resin coating material concentrically with respect to a swash plate center axis | shaft, or apply | coating in a spiral form. Swash plate swash plate.   4. The swash plate for a swash plate compressor according to claim 2, wherein the resin paint is a drop-like resin paint.   5. The swash plate for a swash plate compressor according to claim 1, wherein the swash plate base material is subjected to a shot blasting process on a portion to be a base immediately below the resin coating. .   The swash plate base material is made of a disk-shaped steel plate obtained by pressing a rolled steel plate into a disk shape, and both the surfaces of the disk-shaped steel plate are turned and further subjected to the shot blast treatment. A swash plate for a swash plate compressor according to claim 5.   The swash plate of a swash plate compressor according to any one of claims 1 to 6, wherein the resin coating has its coating surface polished by a double-head polishing machine.   The swash plate for a swash plate compressor according to any one of claims 1 to 7, wherein the resin coating is a resin coating containing at least a fluororesin and graphite in a matrix resin. In the housing where the refrigerant exists, the shoe is slid to a swash plate attached at right angles and obliquely so as to be directly fixed to the rotating shaft or indirectly through a connecting member, and the swash plate is passed through the shoe. Is a method of manufacturing a swash plate for a swash plate compressor that converts the rotational motion of the piston into a reciprocating motion of the piston to compress and expand the refrigerant,
A film forming step of forming a resin film on a sliding surface of the swash plate that slides with the shoe, and the film forming step linearly applies the resin paint discharged from the discharge port to the swash plate substrate; And a method of manufacturing a swash plate for a swash plate compressor, wherein the method is a step of forming a film.   Before the coating film forming step, as a processing step of the swash plate substrate, both surfaces of the disk-shaped steel plate are applied to the swash plate substrate made of a disk-shaped steel plate obtained by pressing a rolled steel plate into a disk shape. 10. The method for manufacturing a swash plate for a swash plate compressor according to claim 9, wherein a lathe is processed and a shot blasting process is performed on a portion to be a base immediately below the resin coating.   In the housing where the refrigerant exists, the shoe is slid to a swash plate attached at right angles and obliquely so as to be directly fixed to the rotating shaft or indirectly through a connecting member, and the swash plate is passed through the shoe. 9. A swash plate compressor that converts the rotary motion of the piston into a reciprocating motion of the piston to compress and expand the refrigerant, wherein the swash plate is the swash plate according to any one of claims 1 to 8. A swash plate type compressor.

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