JP2019100185A - Manufacturing method of swash plate of swash plate type compressor - Google Patents

Abstract

To provide a manufacturing method of a swash plate of a swash plate type compressor which can be reduced in a manufacturing cost compared with the case that a conventional coating method is used, can accurately polish a resin coating, and is excellent in film thickness accuracy.SOLUTION: A manufacturing method of a swash plate 3 having an annular flat-plate shaped swash plate base material 3a and a resin coating 10 on a slide face 3b sliding with a shoe of the swash-plate base material 3a has a coating forming process for forming the resin coating 10 on the slide face 3b by using a roll 11. In the coating process, the roll 11 is relatively moved to the base material 3a with a swash plate axis 13 as a rotation center, and the coating is formed by applying resin paint on an outside diameter face of the roll 11 to the base material so as to be transferred to the base material 3a.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method of manufacturing a swash plate of a swash plate type compressor used in an air conditioner or the like.

  The swash-plate type compressor slides the shoe on a swash plate mounted at right angle and at an angle to fix directly to the rotating shaft or indirectly via the coupling member in the housing where the refrigerant is present, and The rotary motion of the swash plate is converted to the reciprocating motion of the piston to compress and expand the refrigerant. Such a swash plate type compressor is a double-swash plate type in which the refrigerant is compressed and expanded on both sides using a double-headed piston, and a single-slope in which the refrigerant is compressed and expanded only on one side using a single-headed piston There is a board type thing. Also, there are shoes that slide only on one side of the swash plate and those that slide on both sides of the swash plate.

  In these swash plate type compressors, since the metal swash plate and the shoe may slide before the lubricating oil reaches the inside of the housing where the refrigerant is present in the early stage of operation, these sliding portions are made of lubricating oil. It becomes dry dry condition and seizing easily occurs.

  As a means for preventing this seizure, for example, a solid lubricant selected from thermosetting resin, molybdenum disulfide and graphite via an intermediate layer on the sliding surface of a metal swash plate on which the shoes slide. The thing which formed the sliding contact layer which contains is proposed (refer patent document 1). In addition, both surfaces of a swash plate substrate obtained by pressing a rolled steel plate into a disk shape are used as a sliding surface on which a shoe slides, and 40 to 50% by weight of a fluorine resin is compounded on this sliding surface. A swash plate of a swash plate type compressor having a low friction resin coating layer is proposed (see Patent Document 2).

JP-A-11-013638 Patent No. 5321943

  For example, Patent Document 1 describes that the resin film is formed by a coating method such as a spray coating method, an electrostatic coating method, a screen printing method, a pad printing method, a roll method, a dipping method, and a tumbling method. It is done. However, in each of the examples of Patent Documents 1 and 2, film formation by the spray coating method is performed, and there is no specific disclosure of other coating methods.

  By the way, in order to stabilize the friction and wear characteristics, it is necessary to polish the surface of the resin film formed on the sliding surface of the swash plate to improve the accuracy such as flatness. In addition, in order to make the properties of the film uniform, it is also necessary to increase the film thickness accuracy. Furthermore, the film thickness itself needs to be finished with an accuracy of several tens of micrometers.

  From these requirements, the coating method is able to polish the resin film with high accuracy after film formation, to be able to form the film thickness of the resin film stably and uniformly, and to thin the film thickness at the time of coating to several tens of μm What can be done is required. Also from the viewpoint of manufacturing cost, it is also required that the material yield is good, the coating time is short, and the like.

  The present invention has been made to address these problems, and in the swash plate of a swash plate type compressor provided with a resin film, the manufacturing cost can be reduced as compared with the case of using the conventional coating method, It is an object of the present invention to provide a method for manufacturing a swash plate of a swash plate type compressor capable of polishing with high precision resin film and having excellent film thickness accuracy.

  The method for manufacturing the swash plate of the swash plate type compressor according to the present invention comprises: in the housing in which the refrigerant is present, the swash plate attached at right angle and obliquely to be fixed directly to the rotating shaft or indirectly via the connecting member. A method of manufacturing a swash plate of a swash plate type compressor which slides a shoe and converts rotational movement of the swash plate to reciprocating motion of a piston via the shoe to compress and expand a refrigerant, the swash plate comprising the swash plate An annular flat plate-like swash plate base material, and a resin coating on a sliding surface of the swash plate base material that slides with the shoe, and the manufacturing method uses a roll to form the sliding surface And a film forming step of forming a resin film, the film forming step moving the roll relative to the swash plate base with the central axis of the swash plate base as a rotation center, Applied to transfer the resin paint on the outer diameter surface of Characterized in that it is a step of forming a coating Te.

  The roll has a substantially conical shape or a substantially conical shape, and in the film forming step, the roll is disposed such that the diameter increases from the inner diameter of the swash plate base material to the outer diameter direction. It features.

  The circumference of the roll passing an arbitrary point on the outer diameter surface of the roll facing the swash plate base, and the circumference of the swash plate base passing the point on the swash plate base corresponding to the point Is characterized by being equal regardless of the position of any point on the outer diameter surface.

  It is characterized in that the axial length along the outer diameter surface of the roll and the radial width of the annular sliding surface are substantially the same.

  Before the film forming step, as a processing step of the swash plate base material, both surfaces of the disk shaped steel plate are formed with respect to the swash plate base material made of a disk shaped steel plate obtained by pressing a rolled steel plate into a disk shape. It is characterized in that it is lathe processed, and further, a shot blasting treatment is applied to a portion to be a base immediately below the resin coating.

  The method of manufacturing the swash plate of the swash plate type compressor according to the present invention adopts a so-called roll type coating in which a resin coating is formed on the sliding surface of the swash plate base using rolls. There is no volatilization and scattering of the resin paint as compared with the above, and productivity and material yield can be improved. In addition, the roll coating requires a short coating time for the resin paint. As a result of these, the manufacturing cost can be reduced as compared with the case where the conventional coating method is adopted.

  Further, in the film forming step, the roll is moved relative to the swash plate base with the central axis of the swash plate base as a rotation center, and the resin paint on the outer diameter surface of the roll is used as the swash plate base Since coating is performed so as to be transferred, a resin film of uniform thickness can be formed, and the film thickness accuracy is excellent. In addition, the resin coating is linearly applied along the circumferential direction of the swash plate substrate by moving the roll with the central axis of the swash plate substrate as the center of rotation, so the formed resin film is a swash plate substrate. The adhesion strength with the material is high, and peeling does not occur in the polishing process. Therefore, the surface of the resin film can be polished with high precision.

  Since the above-mentioned roll has a substantially truncated cone shape or a substantially conical shape and is arranged so that the diameter of the roll increases from the inner diameter of the swash plate base material to the outer diameter direction, It can be rotated relative to the material smoothly. Thereby, the productivity of the swash plate can be improved.

  The circumference of the roll passing an arbitrary point on the outer diameter surface of the roll facing the swash plate base, and the circumference of the swash plate base passing the point on the swash plate base corresponding to the point Because the ratio is always equal regardless of the position of any point, the resin paint can be transferred to the swash plate substrate without the roll sliding. By this, the film thickness of the resin film apply | coated on the swash plate base material can be made uniform more.

  Since the axial length along the outer diameter surface of the roll and the radial width of the annular sliding surface are substantially the same, the loss of the resin paint is suppressed, and the material yield can be further improved. Further, by making the shape of the roll conform to the sliding surface, it is not necessary to mask the portion (hollow portion etc.) to which the resin paint is not applied, and the manufacturing process of the swash plate can be shortened.

  The above-mentioned swash plate base material is subjected to a shot blasting process to a portion to be a base immediately below the resin film, and therefore, the adhesion strength with the resin film is excellent without providing an intermediate layer such as a metal spray layer. In addition, the manufacturing of the swash plate can be simplified, and the manufacturing cost can be reduced. The swash plate base material is a disc-like steel plate obtained by pressing a rolled steel plate into a discoid shape, both surfaces of the disc-like steel plate are lathe-processed, and the above-mentioned shot blasting treatment is further applied. Thereby, the adhesion strength with the resin film can be improved, and the finish accuracy of the swash plate is suitably affected. In addition, it is possible to omit precision polishing after the above-mentioned lathe machining which has been conventionally required.

It is a longitudinal cross-sectional view which shows an example of the swash plate type | mold compressor of this invention. It is sectional drawing which expands and shows the swash plate of FIG. It is a partial 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 schematic diagram of a general roll-type coating.

  One embodiment of a swash plate type compressor to which a swash plate manufactured by the manufacturing method of the present invention is applied will be described based on the drawings. FIG. 1 is a longitudinal sectional view showing an example of a swash plate type compressor. The swash plate type compressor shown in FIG. 1 uses carbon dioxide gas as a refrigerant, and in the housing 1 where the refrigerant is present, the rotational movement of the swash plate 3 obliquely attached so as to be fixed directly to the rotary shaft 2 The refrigerant is converted on both sides of each piston 5 in the cylinder bore 6 formed at equal intervals in the circumferential direction of the housing 1 by converting into reciprocating motion of the double-ended piston 5 via the shoes 4 sliding on both sides of the plate 3. It is of the swash plate type which is compressed and expanded. The rotary shaft 2 driven to rotate at high speed is supported by needle bearings 7 in the radial direction, and supported by thrust needle bearings 8 in the thrust direction.

  The swash plate 3 may be fixed to the rotation shaft 2 indirectly via the connection member. Also, it may be mounted at a right angle instead of diagonally. The main feature of the swash plate of the swash plate type compressor manufactured by the manufacturing method of the present invention is that it has a resin coating formed by a predetermined roll coating on the sliding surface with the shoe. The present invention is also applicable to the swash plate type compressor of the embodiment.

  Recesses 5a are formed in each piston 5 so as to straddle the outer peripheral portion of the swash plate 3. A hemispherical shoe 4 is seated on a spherical seat 9 formed on the axially opposing surface of the recess 5a. 5 is supported movably 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 smoothly performed. Further, as required, the surface of the shoe 4 may be processed to improve sliding characteristics such as nickel plating.

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

  The resin film 10 is processed with high precision by polishing. By performing polishing using a double-headed polishing machine, the parallelism of both surfaces of the swash plate can be accurately processed. As a grinding method using a double-head grinding machine, for example, a drive type double-head grinding method can be employed in which a disk-shaped steel plate is rotated while holding the axial center and the upper and lower surfaces serving as sliding surfaces are simultaneously ground with a grinding stone . 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 subjecting the portion to be the base immediately below the resin film to a shot blast treatment, the adhesion strength with the resin film is excellent without providing an intermediate layer such as a metal spray layer, and peeling is reduced. . Further, by not forming the thermal spray layer, it is possible to reduce the manufacturing cost and to prevent the lowering of the plane accuracy of the swash plate.

  The composition of the resin film 10 is preferably a composition containing at least a fluorine resin and graphite in a matrix resin. More specifically, 25 to 70 parts by weight of a fluorocarbon resin and 1 to 20 parts by weight of graphite with respect to 100 parts by weight of a matrix resin, and the tensile shear adhesive strength (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, and the low friction characteristic, the wear resistance characteristic, the adhesion strength of the film, and And cavitation resistance in the presence of lubricating oil can be satisfied in a well-balanced manner.

  As a matrix resin, it is a heat resistant resin which has heat resistance not to be thermally deteriorated at the time of use of the swash plate, binds the fluorine resin, and can firmly adhere the resin film to the swash plate base It can be used. Examples of the matrix resin include polyphenylene sulfide resin, polyetheretherketone resin, polyimide resin, polyamide resin, polyamide imide (PAI) resin, epoxy resin, phenol resin and the like. Among these, it is preferable to use a PAI resin because it is excellent in heat resistance, abrasion resistance and adhesion to the swash plate base material.

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

  Such aromatic PAI resins are PAI resins prepared from aromatic primary diamines such as diphenylmethane diamine and aromatic tribasic acid anhydrides such as mono- or diacyl halide derivatives of trimellitic anhydride, aromatics There is a PAI resin produced from tribasic acid anhydride and an aromatic diisocyanate compound such as diphenylmethane diisocyanate. Furthermore, as a PAI resin in which the proportion of imide bonds is increased compared to the amide bond, it is produced from an aromatic, aliphatic or alicyclic diisocyanate compound and an aromatic tetrabasic acid dianhydride and an aromatic tribasic acid anhydride PAI resin, and any PAI resin can be used.

As the fluorine resin, any resin can be used as long as it has low friction and can impart non-adhesiveness to the resin film, and has heat resistance that withstands the operating temperature atmosphere of the swash plate. As the fluorine resin, for example, polytetrafluoroethylene (PTFE) resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer resin, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer resin, tetrafluoroethylene -Ethylene (ETFE) copolymer resin etc. are mentioned. Among these, it is preferable to use a powder of PTFE resin. The PTFE resin has a high melt viscosity of about 10 ¹⁰ to 10 ¹¹ Pa · s at about 340 ° C. to 380 ° C., it is hard to flow even if it exceeds the melting point, and it is the most heat resistant among fluorine resins and excellent even at low temperatures. It exhibits properties and is excellent in 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 1-4 integer) or polyfluoroalkyl group _{(H (CF 2) q -} ) (q can also be used a modified PTFE resin obtained by introducing such as an integer) of 1-20. These PTFE resin and modified PTFE resin may be obtained by adopting any of a suspension polymerization method for obtaining a general molding powder and an emulsion polymerization method for obtaining a fine powder.

  The average particle size (measured value by laser analysis) 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 film.

  As the PTFE resin powder, one obtained by heating and calcining a PTFE resin at or above its melting point can be used. Moreover, the powder which irradiated the gamma ray or the electron beam etc. to the heat-fired powder further can also be used. These PTFE resin powders are excellent in uniform dispersibility in a resin coating for forming a resin film, as compared with PTFE resins (molding powder, fine powder) which have not been subjected to heating and firing or the like, and the resistance of the formed resin film is resistant Excellent wear characteristics.

  It is preferable to mix | blend 25-70 weight part with respect to 100 weight part of matrix resin in resin film with fluorine resin, such as said PTFE resin. If the blending amount of the fluorine resin is less than 25 parts by weight, the low friction property is deteriorated, and there is a possibility that wear acceleration due to heat generation may occur. Moreover, the workability at the time of coating also deteriorates. On the other hand, when the compounding amount of the fluorine resin exceeds 70 parts by weight, the low friction characteristics are excellent, but the film strength and the wear resistance deteriorate, and there is a possibility of abnormal wear under the extreme pressure when the sliding shoe is partially hit. . In particular, when the compounding amount of the fluorine resin is 40 to 50 parts by weight, the tensile shear adhesive strength exceeds 35 MPa, and the safety factor against extreme pressure conditions and the like due to the sliding contact of a piece can be sufficiently ensured. When the amount of the fluorine resin exceeds 70 parts by weight with respect to 100 parts by weight of the matrix resin, it means that the content of the fluorine resin in the resin film exceeds about 40% by weight.

  Graphite is well known to have excellent properties as a solid lubricant and is also used as a solid lubricant for swash plates. Graphite is roughly classified into natural graphite and artificial graphite. Further, the shape may be scaly, granular, spherical or the like, any of which can be used.

  As graphite, use of graphite having 97.5% or more of fixed carbon is preferable, and artificial graphite having 98.5% or more of fixed carbon is more preferable. Such graphite is highly compatible with the lubricating oil, and the lubricating property is maintained by the lubricating oil impregnated in a small amount in the graphite even if the lubricating oil is not attached to the surface.

  The above-mentioned 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 film in order to modify the friction and wear characteristics. If the blending amount of the graphite is less than 1 part by weight, the reforming effect of the friction and wear characteristics when blending the graphite can not be recognized. On the other hand, if the blending amount of graphite exceeds 20 parts by weight, the adhesion of the film is impaired, which may cause peeling. If the total amount of additives such as fluorocarbon resin and graphite 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, the fluorine resin, and the graphite as long as the required characteristics of the swash plate are not significantly reduced. However, the tensile shear adhesive strength of the resin film is low. The friction property, the wear resistance property, and the cavitation resistance can be obtained in the most balanced manner substantially in the case of being formed by three components of a matrix resin, a fluorine resin and a graphite.

  Further, in the resin film, the matrix resin is PAI resin, the fluorocarbon resin is PTFE resin, and the graphite is graphite of 97.5% or more of fixed carbon, which is easy to obtain and relatively inexpensive. The manufacturing cost of the swash plate can be reduced.

  With the reduction in weight and size of the compressor, the swash plate itself is also miniaturized, and specification characteristics under high speed and high load are required to maintain high output. Since cavitation is likely to occur in high-speed, 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 proportion of the matrix resin, such as PAI resin, relative to the solid lubricant. When the amount of the fluorine resin exceeds 70 parts by weight, the ratio of the matrix resin which plays the role of the binder becomes small, and the cavitation resistance is not sufficient. In addition, when the total amount of additives such as fluorocarbon resin and graphite exceeds 90 parts by weight with respect to 100 parts by weight of matrix resin, coating erosion due to cavitation is likely to occur, but the cavitation resistance is secured by being less than that. desirable.

  The production method of the present invention is characterized in that the above-mentioned resin film is formed by roll coating using a roll. Here, first, a general roll-type coating will be described with reference to FIG. FIG. 5 shows a schematic view of an example of a roll coater. The roll coater is an apparatus for applying a resin paint while transferring an object while holding it between two rolls, a coating roll and a support roll. As shown in FIG. 5, the roll coater 21 includes an application roll 22, a support roll 23, a doctor roll 24, and a transport roll 25.

  In the film formation, first, the resin paint wound up from a resin supply means (not shown) such as a pickup roll is supplied to the doctor roll 24. The resin paint 26 supplied to the doctor roll 24 is adjusted to a liquid film of uniform thickness and is applied to the surface of the application roll 22 by the rotation of the application roll 22. The article 27 is conveyed by the conveyance roll 25 in the direction of the arrow A, and is sent between the application roll 22 and the support roll 23. Then, the resin coating 28 on the surface of the coating roll 22 is applied so as to be transferred to the surface of the object to be coated 27, whereby the resin film 28 is formed. In FIG. 5, the application roll 22 is a cylindrical member. Unlike the spray coating method, the roll type coating directly presses the resin paint with a coating roll instead of a mist, so that the resin paint is less volatilized and scattered. Further, since the application time can be shortened, the manufacturing time can be shortened. When roll coating is applied to the swash plate, the object 27 corresponds to the swash plate substrate.

  In the manufacturing method of the present invention, by adopting the roll coating, the manufacturing cost can be reduced. Furthermore, the manufacturing method of the present invention is made by paying attention to the shape of the swash plate and the slidability with the shoe while making use of the advantages of the roll coating, and it is possible to improve the processing accuracy and film thickness accuracy of the resin film. Especially excellent. Specifically, in the film forming step, the coating roll is moved relative to the swash plate base centering on the central axis of the swash plate base, and the resin coating on the outer diameter surface of the coating roll is inclined. It is characterized in that it is applied so as to transfer to a plate substrate.

  One form of the film formation process in the manufacturing method of this invention is demonstrated based on FIG. The upper view of FIG. 4 is an axial sectional view of the swash plate in the film forming step, and the lower view of FIG. 4 is a plan view of the swash plate in the step. In the embodiment of FIG. 4, a cone-shaped roll 11 whose center axis is the roll axis 12 is used as the coating roll. The roll 11 is formed of a small diameter surface, a large diameter surface, and an outer diameter surface connecting the small diameter surface and the large diameter surface. The outer diameter surface is tapered such that the diameter of the outer diameter surface increases and decreases along the roll axis direction.

  In the embodiment of FIG. 4, the roll 11 is disposed such that the radial direction of the flat disk-like base 3 a coincides with the axial direction along the outer diameter surface of the roll 11. Further, the roll 11 is arranged such that the diameter constituting the outer diameter surface of the roll 11 increases from the inner diameter of the base 3 a toward the outer diameter direction. In FIG. 4, the small diameter surface end of the roll 11 and the inner diameter side end of the base 3 a overlap in the swash plate axial direction. Further, the large diameter surface end of the roll 11 and the large diameter side end of the base 3 a overlap in the swash plate axial direction. In the film forming step, the roll 11 and the substrate 3a face each other at an interval corresponding to the film thickness of the resin film at the time of application.

  In the film forming step, the resin paint supplied from a resin supply unit (not shown) is applied to the outer diameter surface of the roll 11. Then, the roll 11 is moved relative to the base material 3 a with the swash plate axis 13 which is the central axis of the base material 3 a (and the swash plate 3) as the rotation center, whereby the outer diameter surface of the roll 11 is obtained. The resin paint is applied to the sliding surface 3b of the substrate 3a. In the embodiment of FIG. 4, the base material 3 a is placed on a rotary table (not shown), and the base material 3 a is rotated in the direction of arrow X while the position of the roll 11 is fixed, thereby moving both relative to each other. As the base 3a rotates, the roll 11 rotates about the roll axis 12, and the resin paint on the outer diameter surface is applied over the entire sliding surface of the base 3a. At this time, the film thickness becomes uniform by relative rotation in a state where the distance between the roll 11 and the base material 3a is maintained. Thus, the thickness of the resin film at the time of application can be adjusted by adjusting the distance between the roll 11 and the substrate 3a, and a thin film can be easily formed.

  The relative movement of the roll 11 and the base 3a is not limited to the form shown in FIG. For example, the base material 3a may be fixed so as not to rotate, and in this state, the roll 11 may be rotated so as to roll about the swash plate shaft 13. In addition, the substrate 3a and the roll 11 may be moved respectively.

  The dimensions of the roll 11 are not particularly limited, but as shown in FIG. 4, the axial length of the outer diameter surface of the roll 11 is substantially the same as the radial width of the annular sliding surface 3b. Is preferred. By making these lengths substantially the same, the resin paint can be applied only to the necessary portions, and the loss of the resin paint can be minimized. Further, by making the shape of the roll 11 conform to the sliding surface 3b, it is not necessary to mask the portion such as the hollow portion where the resin paint is not applied, and the manufacturing process can be performed compared to a general roll type coating. It can be shortened.

  With regard to the dimensions of the roll 11, the circumference of the roll passing a point on the outer diameter surface of the roll 11 facing the base 3a and the circle of the base 3a passing the point on the base 3a corresponding to that point It is preferable to use one in which the ratio to the circumference is equal at any point. This will be specifically described with reference to FIG. The outer circumference (circumferential) of the roll 11 passing through arbitrary points P1 and P2 on the outer diameter surface of the roll 11 facing the substrate 3a is C1 and C2 (see the upper diagram in FIG. 4). In addition, at points P1 'and P2' on the base material 3a opposite to the points P1 and P2 in the swash plate axial direction, circumferences of concentric circles with the base material 3a passing through each point are C1 'and C2' (see FIG. 4) See below). At this time, it is preferable that the ratio of the lengths of C1 and C2 be equal to the ratio of the lengths of C1 'and C2' (C1: C2 = C1 ': C2'). By equalizing these length ratios, the resin paint can be transferred to the substrate 3 a without slippage of the roll 11 at the time of application. By this, the film thickness of the resin film can be made more uniform. In this case, the arbitrary points are not limited to P1 and P2, and the above relationship is established at any point.

  Further, in the film forming step, it is preferable to relatively move the roll 11 so that the extension line along the outer diameter surface of the roll 11 passes through the center of the swash plate as shown in the lower side of FIG. By making the extension line always pass through the center of the swash plate, it is possible to suppress axial deviation and move the roll 11 relatively stably. The angle θ (taper angle θ) formed by a pair of extension lines along the outer diameter surface of the roll 11 is not particularly limited, but is set to, for example, 10 ° to 45 °. The roll 11 may be made of metal or synthetic resin.

  As described above, in the manufacturing method of the present invention, the resin coating is applied by rotating the roll relative to the substrate to apply the resin coating, so the resin film is formed linearly along the circumferential direction of the substrate. That is, since a continuous resin film is formed along the sliding contact direction with the shoe, the slidability with the shoe is excellent. Therefore, the resin film formed by the above-mentioned film formation process has high adhesion strength with the swash plate base material, and the film surface can be polished with high precision. On the other hand, when the general roll coating method shown in FIG. 5 is applied to the formation of the resin coating of the swash plate, the resin coating is along the conveying direction of the swash plate base (direction of arrow A in FIG. 5). Because it is formed, it is not formed along the circumferential direction. Thus, the resin film of the swash plate manufactured by the manufacturing method of this invention is further excellent in processing accuracy.

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

  The resin coating is applied to the swash plate substrate and fired to obtain a cured and adhered resin film. This resin film is made into a film thickness of about 40 micrometers-60 micrometers by the thickness after baking. This resin film with a film thickness of 40 μm to 60 μm can be processed to a film thickness of 8 μm to 30 μm by a double-head polisher to make the final finishing accuracy, flatness 15 μm or less, parallelism 15 μm or less. Since the resin film is polished (finished) by a double-head polisher, it is possible to precisely process the parallelism on both sides of the swash plate sliding surface. The flatness and the parallelism in the present invention are those defined in JIS B0182.

  The surface roughness of the resin film can be changed by the count of the grinding wheel, and is preferably adjusted to 0.1 to 1.0 μm Ra. Within this range, the true contact area on the resin coating sliding surface sliding with the shoe can be increased, the actual surface pressure can be reduced, and the image sticking can be prevented. If the surface roughness is less than 0.1 μm Ra, the supply of lubricating oil to the sliding surface is insufficient, and if it exceeds 1.0 μm Ra, the contact area locally decreases on the sliding surface, resulting in locally high surface pressure and seizing There is a fear. More preferably, the surface roughness is 0.2 to 0.8 μm Ra. In addition, surface roughness Ra in this invention is defined by JISB0601.

  In addition, in the case where polishing is also performed on the swash plate base material to be the base after turning, the plane accuracy of the base material is also excellent, so that the film formability of the resin film is ensured, and stable boundary lubrication by lubricating oil is realized. Even when the lubricating oil is depleted, the friction and wear characteristics can be stabilized in the boundary lubrication state.

  By applying the swash plate manufactured according to the manufacturing method of the present invention to a swash plate type compressor, small diameter shoes are brought into a state of local contact, or cheap shoes such as SUJ2 whose surface is not specially processed Even when the lubricant is used or when the lubricating oil is depleted, the seizure resistance is excellent. 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 manufacturing method of the swash plate of the swash plate type compressor of the present invention can reduce the manufacturing cost as compared with the case of using the conventional coating method, the resin film can be polished with high accuracy, and the film thickness accuracy is excellent. Therefore, it can be widely used as a manufacturing method of a swash plate.

Reference Signs List 1 housing 2 rotation shaft 3 swash plate 3a base 3b sliding surface 4 shoe 5 piston 5a recess 6 cylinder bore 7 needle roller bearing 8 thrust needle roller bearing 9 spherical seat 10 resin film 11 roll 12 roll shaft 13 swash plate shaft 21 Roll coater 22 application roll 23 support roll 24 doctor roll 25 transport roll 26 resin paint 27 application object 28 resin film

Claims (5)

In the housing where the refrigerant is present, the shoe is slid on a swash plate mounted at right angle and at a right angle so as to be fixed directly to the rotary shaft or indirectly via the coupling member, and the swash plate is connected via this shoe A method of manufacturing a swash plate of a swash plate type compressor which converts the rotational motion of the piston into the reciprocating motion of the piston and compresses and expands the refrigerant,
The swash plate has a ring-shaped flat swash plate base, and a resin coating on a sliding surface of the swash plate base that slides on the shoe.
The manufacturing method includes a film forming step of forming a resin film on the sliding surface using a roll, and the film forming step includes the roll being a center of rotation of the central axis of the swash plate base. It is a process which is moved relative to the swash plate base material and applied to transfer the resin paint on the outer diameter surface of the roll to the swash plate base material to form a film. Method of manufacturing swash plate of plate type compressor. The roll has a substantially truncated cone shape or a substantially conical shape,
The swash plate of the swash plate type compressor according to claim 1, wherein in the film forming step, the roll is arranged such that the diameter increases from the inner diameter of the swash plate base toward the outer diameter direction. Production method.   The circumference of the roll passing an arbitrary point on the outer diameter surface of the roll facing the swash plate base, and the circumference of the swash plate base passing a point on the swash plate base corresponding to the point 3. The method of manufacturing a swash plate of a swash plate type compressor according to claim 2, wherein the ratio of s is equal regardless of the position of any point on the outer diameter surface.   The axial length along the outer diameter surface of the roll and the radial width of the annular sliding surface are substantially the same. Of the swash plate of the swash plate type compressor.   Before the film forming step, as a processing step of the swash plate base material, both surfaces of the disk shaped steel plate are formed with respect to the swash plate base material made of a disk shaped steel plate obtained by pressing a rolled steel plate into a disk shape. The method for manufacturing a swash plate of a swash plate type compressor according to any one of claims 1 to 4, further comprising lathing and further subjecting a portion to be a base immediately below the resin film to a shot blasting treatment.

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