JP4801288B2 - Swash plate for car air conditioner and its manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a swash plate for a car air conditioner and a method for manufacturing the swash plate.
[0002]
[Prior art]
A car air conditioner suddenly vaporizes a thermal refrigerant that has been compressed to remove the heat of vaporization and cools the interior of the automobile. A compressor compresses the thermal refrigerant. Compressors for car air conditioners receive driving force from the engine of the car, take the heat inside the car with an evaporator, suck in the vaporized low-pressure and high-temperature heat refrigerant, compress it, and send the high-temperature and high-pressure heat refrigerant to the condenser I have a role.
[0003]
As a compressor for a car air conditioner, there are a crank type, a wapple type, a swash type, etc., but the swash type compressor is most frequently used today.
[0004]
Here is a brief description of the swash compressor. FIG. 6 is an enlarged view of a main part of a compressor for a car air conditioner.
[0005]
A piston 2 is installed in the cylinder 1 so as to be able to reciprocate. The cylinder 1 is divided into a left cylinder chamber 3 and a right cylinder chamber 4 by the piston. A left suction valve 5 and a left discharge valve 6 are installed in the left cylinder chamber 3, and a right suction valve 7 and a right discharge valve 8 are installed in the right cylinder chamber 4. A swash plate 11 is disposed at the center of the piston 2 so as to be sandwiched between the left piston shoe 9 and the right piston shoe 10. The swash plate is attached to the rotary shaft 12 in an inclined state with respect to the rotary shaft 12, and a left bearing alloy 13 and a right bearing alloy 14 are bonded to both surfaces of the swash plate that is in sliding contact with the left and right piston shoes. Yes.
[0006]
Next, the relationship between the piston and the swash plate in the swash compressor will be described with reference to FIG. The discharge by the discharge valve of the heat medium and the intake by the intake valve are indicated by small arrows. For ease of viewing, only one of a plurality of pistons acting on the swash plate is shown.
[0007]
(1) When the swash plate 11 attached to the rotating shaft 12 in an inclined manner rotates and the portion in contact with the piston reaches the leftmost position in the drawing, the piston 2 is pushed by the left piston shoe 9 and the left cylinder chamber 3 To the minimum volume. At this time, the left discharge valve 6 is opened, the thermal refrigerant in the left cylinder chamber is discharged, and the suction valve 8 in the right cylinder chamber 4 is opened to suck in the thermal refrigerant.
(2) Next, the swash plate 11 rotates to move the piston 2 from left to right. At this time, the right intake valve 7 and the right discharge valve 8 of the right cylinder chamber 4 are closed, and the thermal refrigerant in the right cylinder chamber 4 is compressed and liquefied. Then, the left suction valve 5 of the left cylinder chamber 3 is opened and the heat refrigerant is sucked into the left cylinder chamber 3.
(3) When the swash plate 11 rotates and reaches the rightmost position, the piston 2 moves rightward in the cylinder 1 and discharges the thermal refrigerant in the right cylinder chamber 4 from the right discharge valve 8. At this time, the volume of the left cylinder chamber 3 increases and the left suction valve 5 opens to suck in the hot refrigerant.
(4) Further, the swash plate 11 rotates to move the piston 2 from the right to the left. At this time, the left suction valve 5 and the left discharge valve 6 in the left cylinder chamber 3 are closed, and the thermal refrigerant in the left cylinder chamber 3 is compressed and liquefied. Then, the right suction valve 7 of the right cylinder chamber 4 is opened and the heat refrigerant is sucked into the right cylinder chamber 4.
In this way, in the compressor for a car air conditioner, the thermal refrigerant is compressed and liquefied, and the refrigerant is suddenly discharged and vaporized to exhibit a cooling action.
[0008]
In a compressor for a car air conditioner, the swash plate rotates at a high speed, and the piston compresses the thermal refrigerant in the cylinder chamber at a high pressure, so that the shoe slides on the swash plate in a high speed and high load state. Therefore, the swash plate must be a material having bearing characteristics such as wear resistance and low friction coefficient that can withstand high speed and high load. As a material having such bearing characteristics, a bearing alloy containing copper as a main component and adding a small amount of tin, lead or the like to this is suitable. Although it is conceivable to produce a swash plate with only a bearing alloy, a copper alloy has a low mechanical strength, and thus deforms when a high load is applied. Therefore, a steel plate having excellent mechanical strength is used as the swash plate, and a bearing alloy is bonded to the surface to support a high load with the steel plate, and the bearing characteristics are exhibited with the bearing alloy.
[0009]
Conventionally, a bearing alloy is adhered to a steel plate by a thermal spraying method as a method of adhering the bearing alloy to the steel plate during the production of the swash plate. In this thermal spraying method, a bearing alloy previously processed into a linear shape is melted with a high-temperature heating device such as a plasma arc or a gas flame, and at the same time, the bearing alloy melted with a compressed gas is blown away. When the molten bearing alloy blown off with the compressed gas hits the disk-shaped steel plate, the molten bearing alloy adheres to the steel plate and forms a bearing alloy layer. The thermal spraying of the bearing alloy is performed on both surfaces of the steel plate. Thereafter, the surface of the bearing alloy layer is cut to a predetermined thickness.
[0010]
[Problems to be solved by the invention]
By the way, the swash plate manufactured by the thermal spraying method is rare, but the shoe and the bearing alloy layer are seized during use, or the shoe does not slide smoothly due to increased frictional resistance against the bearing alloy layer. In some cases, the bearing alloy layer may peel off from the steel plate.
[0011]
As a result of intensive studies on the problems in the above-described conventional swash plate, the inventors have found that the shoe and the bearing alloy layer are seized or the frictional resistance of the bearing alloy layer is increased. It was found that due to the alloy density, the bearing alloy layer was peeled from the steel sheet due to the adhesive strength between the bearing alloy layer and the steel sheet.
[0012]
When a swash plate manufactured by thermal spraying is used in a swash compressor, the bearing alloy layer may cause seizure with the piston shoe or increase in frictional resistance as described above. Because. That is, in the thermal spraying method, the melted bearing alloy is blown off with high-pressure gas. At this time, since the molten bearing alloy is refined and hits and adheres to the steel plate, the bearing alloy that adheres successively accumulates fine bearing alloy particles. The structure is porous with voids inside. If this porous bearing alloy layer is used for a heavy load such as a swash compressor, the intergranular gaps are crushed, and the piston shoe raceways are grooved on the bearing alloy layer. Thus, since this groove increases the contact area with the piston shoe, the seizure and frictional resistance are increased.
[0013]
Further, the reason why the adhesive strength between the steel plate and the bearing alloy layer is weak in the swash plate manufactured by the thermal spraying method is that the bearing alloy layer and the steel plate are merely mechanically bonded. In other words, in the thermal spraying method, the bearing alloy is applied to the steel plate with the force of blowing the molten bearing alloy with the compressed gas. At this time, the bearing alloy bites into the steel plate, and the bearing alloy that bites into the steel plate adheres to the steel plate by the anchor action. In the case where the metal is mechanically bonded in this way, when partial peeling occurs, it sequentially spreads to the adjacent bonded portion, and finally the entire peeling occurs. Therefore, the swash plate manufactured by the thermal spraying method sometimes causes a problem that the bearing alloy layer is peeled off from the steel plate.
[0014]
It is an object of the present invention to provide a swash plate and a method for manufacturing the swash plate that not only does not cause seizure or increase in frictional resistance over a long period of time but also does not easily peel.
[0015]
[Means for Solving the Problems]
In the first invention of the present application, bearing alloy powder is bonded to both surfaces of a disk-shaped steel plate by a sintering method to form a bearing alloy layer, and the bearing alloy has an alloy density of 85% or more, and the bearing alloy has an inner Is a swash plate for a car air conditioner characterized in that there is no metallic non-bonded interface.
[0016]
Moreover, 2nd invention of this application is a manufacturing method of the swash plate which consists of the next process.
A: A step of uniformly dispersing bearing alloy powder on one side of a disk-shaped steel plate,
B: A primary sintering step in which a disk-shaped steel sheet in which bearing alloy powder is dispersed on one side is heated in a reducing atmosphere at 800 to 900 ° C. to bond the bearing alloy powder to each other, and the bearing alloy and the disk-shaped steel sheet;
C: Step of uniformly dispersing bearing alloy powder on the other surface of the disk-shaped steel plate with the bearing alloy bonded on one side;
D: A disk-shaped steel plate in which bearing alloy powder is sintered on one side and bearing alloy powder is dispersed on the other side is heated in a reducing atmosphere at 800 to 900 ° C. A secondary sintering step of forming a bearing alloy layer on the disk-shaped steel sheet by bonding the steel sheet
E: A primary pressing process in which a secondary sintered disc-shaped steel plate is pressed to crush the porous voids in the bearing alloy layer;
F: a tertiary sintering step in which the initially pressed disk-shaped steel sheet is heated in a reducing atmosphere at 800 to 900 ° C. to bond the crushed voids metallically;
G: rough finishing process for cutting the bearing alloy layer to a predetermined thickness,
H: Precision finishing process that smoothens the surface of the bearing alloy layer that has been subjected to rough finishing.
A method for producing a swash plate for a car air conditioner, comprising:
[0017]
The swash plate of the present invention must have an alloy density of 85% or higher. This alloy density is the ratio of the volume of the actual bearing alloy layer to the volume of the bearing alloy layer in an ideal state with no voids or interfaces inside. The larger the alloy density, the more the inside of the bearing alloy is. It is dense and there is less seizure.
[0018]
In other words, since a powdered bearing alloy is used in the sintering method, the powdered bearing alloy is bonded to each other, only the contact portion between the powder and the steel plate is bonded, and the other is a porous hole that becomes a void. It is quality. If there is a gap in the inside as described above, when the shoe with high load hits strongly, the portion is recessed. For this reason, the bearing alloy layer obtained by the sintering method must mechanically crush the gaps.
[0019]
Further, when the sintered bearing alloy layer is pressed with a press in this manner, the bearing alloy does not dent when a high load is applied, but peeling may occur inside the bearing alloy layer. That is, if the gap is simply crushed with a press, the crushed portion is an interface that is in close contact but is not metallicly bonded. If a lateral force is applied to the interface when the compressor is used, the interface peels off. Therefore, in the present invention, tertiary sintering is performed after the primary pressing to join the unbonded portions in a metallic manner.
[0020]
FIG. 8 is a view obtained by tracing a micrograph (BEI) of a bearing alloy that is just pressed by a press after the secondary sintering and the processes from A to E in the manufacturing process of the swash plate. The alloy density of the bearing alloy here was 85%. The portion shown in black in FIG. 8 is a metallic non-bonded interface.
[0021]
FIG. 9 is a diagram obtained by tracing micrographs (BEI) of bearing alloys that have been subjected to tertiary sintering after the processes from A to F, that is, the secondary sintering process and the pressing process, in the manufacturing process of the swash plate. is there. As can be seen from FIG. 9, the black portion, that is, the metal-unbonded interface disappears, and the entire bearing alloy has a uniform structure. The alloy density of the bearing alloy here was 90%. The alloy density was increased in this way because there was an unbonded interface at the primary pressing stage, and this part was not completely bonded, so it was not completely dense, but the third sintering As a result of the above, it is considered that the unbonded portion was metallicly bonded and the alloy density was further increased.
[0022]
FIG. 10 shows the test results of the relationship between the alloy density and the baking time. This test was performed under severe conditions such as dry start (no lubrication) assuming the start of the compressor. The test conditions are a swash plate surface pressure of 100 kg / cm ² and a swash plate peripheral speed of 18 m / sec. From this test result, the baking time is short when the alloy density is 80%, but when it exceeds 85%, the baking time rapidly increases and exceeds 5 minutes, which is sufficient for use as a swash plate for a compressor of a car air conditioner. Come to endure.
[0023]
In the swash plate of the present invention, the bearing alloy layer preferably has a hardness of Hv60 or higher. When the hardness of the bearing alloy layer is smaller than Hv60, the bearing alloy layer is deformed when the piston is pressed at a high pressure like a car air conditioner. In other words, a shoe with a small area slides against the swash plate, so if the bearing alloy layer is not hard enough, the bearing alloy layer is deformed to form a groove in the shoe raceway, increasing the contact area with the shoe. Because it will end up. As a result, the swash plate not only increases the frictional resistance but also seizes.
[0024]
Further, the swash plate of the present invention needs to have a shear strength between the disc-shaped steel plate and the bearing alloy layer of 130 MPa or more. If the shear strength between the disk-shaped steel plate and the bearing alloy layer is less than 130 MPa, the disk-shaped steel plate and the bearing alloy layer may become unusable during use under severe conditions such as car air conditioners that require high speed and high load. This is because there is a risk of peeling. In order to increase the shear strength, it is preferable that the disk-shaped steel plate and the bearing alloy powder are metallicly bonded. As described above, since the sintering method bonds both metals metallicly, a strong shear strength can be obtained.
[0025]
In the swash plate manufacturing method of the present invention, the disk-shaped steel plate and the bearing alloy powder are bonded by a sintering method. Sintering is a process where metals are brought into contact with each other and heated to a temperature below the liquidus temperature of those metals to diffuse the atoms of one metal into the other, thereby allowing both metals to diffuse. It is to be glued. During this heating, if oxygen is present around the metal, the metal surface is oxidized with oxygen to form an oxide film, which prevents diffusion between the metals. Further, even if the metal is not heated to a high temperature, the surface is oxidized by oxygen in the atmosphere and is covered with an oxide film. Therefore, when the metals are bonded together by the sintering method, it is performed in a reducing atmosphere in which there is no oxygen and the oxide film can be removed by reduction. In order to obtain a reducing atmosphere, it is suitable to use a reducing gas such as hydrogen gas or ammonia decomposition gas.
[0026]
During the manufacture of the swash plate, the sintering of the bearing alloy powders, the bearing alloy powder and the disk-shaped steel plate is performed in a reducing atmosphere at 800 to 900 ° C., and this temperature does not melt the steel plate and the bearing alloy. This temperature is optimal for exhibiting the active action of the reducing gas.
[0027]
Since the bearing alloy layer after the tertiary sintering does not have a predetermined thickness, the surface of the bearing alloy layer is cut by a cutting device such as a lathe. After cutting with this lathe, the cutting marks of the bite remain on the surface of the bearing alloy layer, and when used in a compressor for a car air conditioner, the cutting marks damage the piston shoe or prevent smooth sliding. Finishing is performed after cutting. For finishing, roller finishing without using a cutting tool is suitable.
[0028]
If the hardness of the bearing alloy layer of the swash plate obtained by the swash plate manufacturing method of the present invention is not a desired numerical value, the secondary pressing step is performed again after the tertiary sintering, and the surface hardness of the bearing alloy layer Can also be adjusted. The secondary press is performed in the same manner as the primary press.
[0029]
In the operating state of the compressor, when the compression reaction force generated during the compression process is strongest, it is a full stroke state when the demand for the cooling capacity is high. In other words, the load is highest at the time of maximum compression (piston is in the vicinity of the dead center), which is the operation in the state where the cooling capacity is insufficient and the swash plate is sleeping ((1) and (3)). In this case, the moment acting on the swash plate is as follows: (1) Moment generated by the centrifugal force of the swash plate itself due to rotation, (2) Moment generated by the reciprocating inertia force of the piston, (3) Crank chamber and cylinder It consists of a moment acting on the swash plate via the shoe due to the pressure difference. In other words, it operates by the relaxation of the moment due to the pressure difference acting on the swash plate fulcrum from the plurality of pistons, and the compressor operates with the balance of the moments around the component parts that are the fulcrum of these (1), (2) and (3), The swash plate is generally pressed against the shoe with a compression reaction force. Here, in order for the swash plate to continue to rotate without being damaged by the shoe, it is required that the swash plate does not undergo plastic deformation due to the compression reaction force. It is also required not to.
[0030]
In this example, the hardness of the swash plate is particularly correlated with the plastic deformation at the time of maximum compression and the fastening force density and shear force between sintered molecules of sintering, and the higher the hardness, the more plastic deformation at the time of compression. The amount decreases and the shear force increases. Accordingly, in order to satisfy these requirements, plastic deformation can be prevented and the piston can be smoothly reciprocated by setting the hardness of the swash plate, which is a double-sided sintering, to Hv60 or more.
[0031]
【Example】
The swash plate of the present invention and the manufacturing method thereof will be described below with reference to the drawings. A to H shown separately in FIG. 1 to FIG. 4 are diagrams for explaining each step in the method for producing a swash plate of the present invention, and FIG. 5 is a perspective view of the swash plate of the present invention.
[0032]
A: Bearing alloy powder spraying process on one side The disc-shaped steel plate 10 is placed on a rotatable horizontal table (not shown). Since a bearing alloy is not required at the center portion where the swash plate is fixed to the rotating shaft of the compressor for the car air conditioner, the scattering prevention cylinder 11 is placed at the center of the steel plate 10. Thereafter, a large amount of bearing alloy powder 12 is sprinkled on the portion other than the cylinder 11, and the horizontal table (not shown) is rotated. At this time, a scraping plate 13 is installed at a position where the bearing alloy powder has a predetermined thickness, and unnecessary bearing alloy powder is scraped off.
B: The disk-shaped steel plate 10 in which the bearing alloy powder 12 is sprinkled in a predetermined thickness on the necessary part of the primary sintering process is heated in the sintering furnace 14, and the bearing alloy powders, the bearing alloy powder and the disk-shaped steel plate The bearing alloy layer 15 is formed on the disk-shaped steel plate. The reducing gas at this time uses ammonia decomposition gas, and the sintering temperature is 815 ° C.
C: Bearing alloy powder spraying step on the other surface The bearing alloy powder 12 is sprayed on the other surface of the steel plate 10 on which the bearing alloy powder is not sintered in the same manner as the above-described bearing alloy powder spraying step.
D: Secondary sintering step In the same manner as the primary sintering step described above, the disk-shaped steel plate on which the bearing alloy powder is dispersed is subjected to secondary sintering to form the bearing alloy layer 16 on the disk-shaped steel plate.
E: The disk-shaped steel plate in which the bearing alloy layers 15 and 16 are formed on both surfaces of the primary press step is placed on the press stand 17 and pressed from above by a press punch 18. The pressing here is performed to crush the voids in the bearing alloy layer to increase the alloy density.
F: Tertiary sintering process In the primary press, only the voids of the bearing alloy layer are crushed, and the crushed portion is an interface extending laterally. Since this interface is not metallicly bonded, it easily peels off. Therefore, tertiary sintering is performed to join the interface metallically. The tertiary sintering is performed under the same conditions as the primary sintering and the secondary sintering described above.
G: Rough finishing process The bearing alloy powder is sprayed slightly thicker than the predetermined thickness of the bearing alloy layer even if pressing is performed. Therefore, here, the bearing alloy layer is cut with the cutting tool 19 of the lathe so that the bearing alloy layer has a predetermined thickness.
H: In a cutting device such as a finishing process lathe, the cutting trace always remains regardless of the shape of the cutting edge of the cutting tool so that the cutting trace does not remain on the workpiece. If cutting marks remain on the swash plate, the piston shoe cannot slide smoothly, and seizure and frictional resistance increase. Finishing is performed to eliminate this cutting mark. In the finishing process, by pressing the surface of the swash plate attached to the lathe with the roller 20, the cutting trace can be eliminated.
[0033]
FIG. 5 is a swash plate obtained by the production method of the present invention. In the swash plate S, bearing alloy layers 15 and 16 are formed on both surfaces of the disc-shaped steel plate 10 by a sintering method. A hole 21 is formed in the central portion of the disk-shaped steel plate 10 so as to be inserted into the rotating shaft, and screw holes 22 for fixing the rotating shaft are formed around the hole 21. There is no bearing alloy in the portion where the screw hole 22 is formed around the hole 21 for inserting the rotary shaft.
[0034]
Using LBC-3 (Cu-10Sn-10Pb) as the bearing alloy powder and S45C as the disc-shaped steel plate, the swash plate obtained by the above manufacturing method and the swash plate obtained by the conventional spraying method were tested. As a result, in the manufacturing method of the present invention, the swash plate in which the pressing process is performed until the primary press has an alloy density of the bearing alloy layer of 90%, a hardness of Hv60, a baking surface pressure of 20 MPa, and between the disc-shaped steel plate and the bearing alloy layer. The shear strength of was 200 MPa. Similarly, in the production method of the present invention, the swash plate that was subjected to secondary pressing after tertiary sintering had an alloy density of 95%, a hardness of Hv100, a shear strength of 170 MPa, and a baking surface pressure of 22 MPa. On the other hand, the swash plate obtained by the conventional thermal spraying method had an alloy density of 80%, a hardness of Hv70, a shear strength of 100 MPa, and a baking surface pressure of 15 MPa. The baking surface pressure here is a reference for determining the characteristics of the swash plate, and is performed using a thrust friction tester. The baking surface pressure as the swash plate needs to be 18 MPa or more, and the swash plate obtained by the production method of the present invention has a baking surface pressure of 20 MPa or more.
[0035]
【The invention's effect】
As described above, the swash plate of the present invention is not likely to cause seizure because the alloy density of the bearing alloy layer is sufficiently large even under severe conditions where high speed and high load are applied, such as a car air conditioner compressor. In addition, it has optimum characteristics as a swash plate that can reduce frictional resistance. In addition, the swash plate of the present invention has excellent reliability that the adhesion between the bearing alloy and the disk-shaped steel plate is very strong, so that peeling does not easily occur. The method for producing a swash plate of the present invention has a sufficiently high alloy density suitable for a compressor for a car air conditioner, and has excellent lubricity and reliability since high hardness and strong shear strength can be obtained. A swash plate can be manufactured.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a process of forming a bearing alloy layer on one side of a disk-shaped steel plate in a swash plate manufacturing process according to an embodiment of the present invention.
FIG. 2 is a diagram for explaining a process of forming a bearing alloy layer on the other surface of the disk-shaped steel plate in the swash plate manufacturing process according to an embodiment of the present invention.
FIG. 3 shows a process for manufacturing a swash plate according to an embodiment of the present invention, in which a bearing alloy layer formed on both surfaces of a disk-shaped steel plate is pressed to crush internal voids, and the voids are made metallic by a sintering method. The figure explaining the process made to adhere | attach.
FIG. 4 is a view for explaining a finishing process in a manufacturing process of a swash plate according to an embodiment of the present invention.
FIG. 5 is a perspective view of the swash plate of the present invention. FIG. 6 is a schematic view of the main part of a swash compressor.
FIG. 7 is a series of diagrams illustrating the operating principle of a swash compressor.
FIG. 8 is a diagram obtained by tracing a micrograph of a bearing alloy layer obtained by performing only primary pressing after secondary sintering by a sintering method.
FIG. 9 is a diagram obtained by tracing micrographs of bearing alloy layers that have been subjected to secondary sintering by a sintering method and tertiary sintering after primary pressing.
FIG. 10 is a graph showing the relationship between the alloy density of the bearing alloy layer and the baking time.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Disc shaped steel plate 12 Bearing alloy powder 14 Sintering furnace 15, 16 Bearing alloy layer 18 Press punch

Claims (4)

Bearing alloy powder is bonded to both sides of the disk-shaped steel plate by a sintering method to form a bearing alloy layer. The bearing alloy layer has an alloy density of 85% or more, and the inside of the bearing alloy layer is metallic. A swash plate for a car air conditioner, wherein a shear strength between a disk-shaped steel plate and a bearing alloy layer is 130 MPa or more in a swash plate for a car air conditioner having no unbonded interface . The swash plate for a car air conditioner according to claim 1, wherein the bearing alloy layer has hardness in a range not accompanied by plastic deformation. A: A step of uniformly dispersing bearing alloy powder on one side of a disk-shaped steel plate,
B: A primary sintering step in which a disk-shaped steel sheet in which bearing alloy powder is dispersed on one side is heated in a reducing atmosphere at 800 to 900 ° C. to bond the bearing alloy powder to each other, and the bearing alloy and the disk-shaped steel sheet;
C: Step of uniformly dispersing bearing alloy powder on the other surface of the disk-shaped steel plate with the bearing alloy bonded on one side;
D: A disk-shaped steel plate in which bearing alloy powder is sintered on one side and bearing alloy powder is dispersed on the other side is heated in a reducing atmosphere at 800 to 900 ° C. A secondary sintering step of forming a bearing alloy layer on the disk-shaped steel sheet by bonding the steel sheet
E: A primary pressing process in which a secondary sintered disc-shaped steel plate is pressed to crush the porous voids in the bearing alloy layer;
F: a tertiary sintering step in which the initially pressed disk-shaped steel sheet is heated in a reducing atmosphere at 800 to 900 ° C. to bond the crushed voids metallically;
G: rough finishing process for cutting the bearing alloy layer to a predetermined thickness,
H: Precision finishing process that smoothens the surface of the bearing alloy layer that has been subjected to rough finishing.
A method for producing a swash plate for a car air conditioner, comprising: 4. The method for producing a swash plate for a car air conditioner according to claim 3, wherein a secondary press is performed for hardness adjustment after the tertiary sintering step.

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