KR20200012084A - Friction material coating method for compressor tribo-parts and compressor having the same - Google Patents

Abstract

The present invention relates to a friction material coating method of a sliding member for a compressor and a coating structure thereof. The friction material coating method of a sliding member for a compressor comprises: a base material preparing process of preparing a base material of a sliding member for a compressor; a coating film preparing process of preparing a friction material coating film for coating the base material; and a coating film bonding process of embossing the surface of the base material and injection-bonding the base material and the friction material coating film. The present invention: solves problems caused by existing slits by injection-coating the surface of a base material of a sliding member for a compressor with a coating film which is a friction material after embossing nano etching on the base material surface of the sliding member for a compressor; and has an effect of shortening processes and production time and reducing costs.

Description

Friction material coating method of sliding member for compressor and compressor including the same {FRICTION MATERIAL COATING METHOD FOR COMPRESSOR TRIBO-PARTS AND COMPRESSOR HAVING THE SAME}

The present invention relates to a friction material coating method and a compressor of the sliding member for the compressor, and more particularly, to the surface of the base of the sliding member for the compressor after the nano etching embossing (nano etching embossing) process by injection-bonding the coating film of the friction material together ( The present invention relates to a friction material coating method and a compressor of a sliding member for a compressor capable of shortening a process and manufacturing time and reducing a cost.

In general, a compressor that serves to compress a refrigerant in a vehicle cooling system has been developed in various forms. In such a compressor, a configuration for compressing a refrigerant includes a reciprocating type that performs compression while reciprocating, and performs compression while rotating. There is a rotary.

Here, the reciprocating compressor includes a crank type for transmitting the driving force of the driving source to the plurality of pistons using a crank, a swash plate type for transmitting to a rotating shaft provided with a swash plate, and a wobble plate type using a wobble plate, and the rotary compressor is rotated. There are vane rotary type using rotary axis and vane, and scroll type using turning scroll and fixed scroll.

On the other hand, the swash plate type compressor includes a fixed displacement type with a fixed installation angle of the swash plate, and a variable displacement type that can change the discharge capacity by changing the inclination angle of the swash plate.

2A-2C disclose an example of components used in a swash plate compressor. The component posted in FIG. 2A is a sliding member 1 for a compressor, the component posted in FIG. 2B is a swash plate 3, and the component posted in FIG. 2C is a piston 5.

Compressor sliding member (1), swash plate (3), the piston (5), etc. are mainly caused by the friction between the movement of the parts, the durability of the product is reduced because of this.

Therefore, the friction material made of a resin-based material such as PTFE (Poly Tetra Fluoro Ethylene) is coated on the compressor sliding member so that the surface friction coefficient (Low COF) of the compressor sliding member is reduced to reduce the friction loss.

In the sliding member 1 for a compressor, a friction material 7 is coated on an inner circumferential surface, a friction material 7 is coated on a swash plate 3 on a disk-shaped surface, and a friction material 7 is coated on a surface of a piston 5. do.

Among them, the sliding member for the compressor (slide bush) is inserted into the contact surface of the hole through which the shaft of the cylinder penetrates, thereby preventing the cylinder from being worn by the rotation of the shaft and preventing the shaft from vibrating in the vertical direction of the rotating shaft. do.

1 discloses a process of coating a friction material on a sliding member for a conventional compressor.

Referring to FIG. 1, a process of coating a friction material on a sliding member for a conventional compressor may be classified into a coating film preparation process, a coating film manufacturing process, a coating film bonding process, a cutting process, and a forming process.

First, the coating film preparation process consists of mixing the friction material powder (pressing), pressing the mixed friction material powder with a compactor, and sintering the pressed friction material powder, the process is still A coating film is prepared to coat the base material of the sliding member for the compressor, which is not trimmed.

Next, the coating film manufacturing process includes a step of avoiding relatively roughening the surface of the coating film, which is a friction material, and a step of grinding the surface of the avoided coating film, relatively evenly. The coating film to be bonded to is provided after being trimmed.

The next coating film bonding process is to apply a separate sintered material such as copper powder, resin film, etc., which serves as a bonding material by deteriorating roughness on the surface of the base material, and coating on the base material on which the bonding material is applied. And lamination processing of pasting the film. The bonding force between the release materials is determined by the kind of sintered material corresponding to the bonding material.

Thereafter, the base material bonded to the friction material coating film is cut to a size corresponding to the sliding member for the compressor, and the base material cut to an appropriate size is formed into a shape corresponding to the sliding member for the compressor. It goes through the process.

Through the above process steps, the sliding member for the compressor disclosed in FIG. 2A is coated with a friction material.

However, when the above process is performed, there is a problem in that the roundness of the base material cannot be secured at the step of forming the base material into a cylindrical shape as shown in FIG. 2A.

Initially, the base material was in the form of a plate, which was formed into a cylindrical shape, so that a perfect circle was not formed or a locally crushed circle shape occurred. In this case, the compressor sliding member 1 disclosed in FIG. 2A during long-term driving does not maintain a constant clearance with the drive shaft, which causes a problem of increased vibration and reduced durability.

In addition, the slit 1a is generated in the sliding member for a compressor, as shown in FIGS. 2A and 2C, and a gap may occur between the slits under certain fatigue conditions. This causes a decrease in product performance.

In order to bond the coating film to the surface of the base material, since a sintered material corresponding to a separate bonding material is used, the process increases, which causes an increase in manufacturing time and cost.

Domestic Patent Publication No: 10-2010-0138618 A

The present invention has been made in order to solve the problems in the related art as described above, the object of the present invention is injection coating the coating film as a friction material after the nano etching embossing treatment on the base material surface of the sliding member for the compressor To prevent the problems caused by the slit by removing the slit formed in the conventional manufacturing process, and to provide a friction material coating method and compressor of the sliding member for the compressor that can reduce the process (process) and manufacturing time and cost have.

The present invention for achieving the above object relates to a friction material coating method of the sliding member for the compressor, in the friction material coating method of the sliding member for the compressor, a base material preparation step of preparing a base material of the sliding member for the compressor (base material preparation process Is to form a cylindrical base material, the conventional forming process is eliminated, no slit is formed) and a coating film preparation process for preparing a friction material coating film for coating the base material and the surface of the base material embossing, the base material and the It may include a coating film bonding process of injection coating the friction material coating film together.

In addition, in the embodiment of the present invention, the base material preparation process, the step of drawing or forging the base material to the size corresponding to the sliding member for the compressor and the drawn or forged base material to the shape corresponding to the sliding member for the compressor Processing may be included.

In addition, in the embodiment of the present invention, the coating film preparation process may include mixing the friction material powder, compressing the mixed friction material powder, and sintering the compressed friction material powder.

In the embodiment of the present invention, the coating film bonding process, the step of embossing the surface of the base material by nano-etching and the step of integral injection coating by bonding a friction material coating film to the surface of the embossed base material and the injection coating And polishing the surface of the friction material coating film.

According to the present invention, a method of bonding a conventional sintered material between a base metal material and a friction material coating film of a resin material using a separate sintered material together with a coating film as a friction material after nano etching embossing treatment on the surface of the metal base material By changing the way of injection bonding, the friction material coating process is shortened. This can be expected to reduce the manufacturing time and cost of the sliding member for the compressor.

The process of the present invention can be applied to other metal base materials, such as Al, SUS, Ti, as well as steel base metal base material without limitation, and when applied to relatively light metals, it is also associated with the way that a separate bonding material is not used to help reduce the weight Will be given. In addition, the friction material may also be applied to various materials such as PPS, PBT, PP in addition to PTFE, it is possible to use environmentally friendly materials.

In addition, by removing the slit which is indispensably formed in the manufacturing process including the forming process after the conventional coating film bonding process, it is possible to prevent the problem caused by the slit.

1 is a view showing a friction material coating method for the base material of the sliding member for a conventional compressor.
2a to 2c is a view showing a state in which the friction material is coated on the components of the swash plate type compressor.
Figure 3 is a view showing a friction material coating method for the base material of the sliding member for a compressor of the present invention.
Figure 4 is a view showing a comparison between the laminated structure of the sliding member for a conventional compressor and the sliding member for the compressor produced by the present invention.
Fig. 5 is a side cross-sectional view showing a state in which a sliding member (slide bush) for a compressor produced by the present invention is disposed on a swash plate type compressor;
Figure 6 is a perspective view showing a sliding member (slide bush) for the compressor produced by the present invention.

Hereinafter, preferred embodiments of the friction material coating method and the compressor of the sliding member for a compressor according to the present invention with reference to the accompanying drawings.

First, with reference to Figure 5 will be described the basic form of the swash plate compressor to which the present invention is applied. However, the present invention is not necessarily limited to such a structure, and the description of the swash plate compressor is effective only within the understanding of the present invention.

Referring to Figure 5, the swash plate compressor 10 is provided with a cylinder block 20 to form a part of the appearance and the skeleton of the compressor 10. The cylinder block 20, the front housing 30 and the rear housing 40 are combined to form a compressor housing. At this time, the center bore 21 is formed through the center of the cylinder block 20, the shaft 94 is installed rotatably.

In this case, the sliding member for the compressor manufactured by the present invention, for example, the slide bush 100, may be disposed inside the center bore 21 so that the shaft 94 is smoothly supported and rotates. The slide bush 100 itself may be manufactured in a cylindrical shape as shown in FIG. 6, and unlike the conventional slide bush 1 (FIG. 2A), a slit 1a is not formed. Such a manufacturing method will be described below with reference to FIGS. 3 and 4.

A plurality of cylinder bores 22 are formed through the cylinder block 20 so as to radially surround the center bore 21, and the piston 70 is installed in the cylinder bore 22 so as to linearly reciprocate. At this time, the piston 70 is formed in a cylindrical shape, the cylinder bore 22 is a cylindrical space corresponding thereto, and the refrigerant in the cylinder bore 22 is compressed by the reciprocating motion of the piston 70.

The front housing 30 is coupled to the front of the cylinder block 20. The front housing 30 has an opposite surface facing the cylinder block 20 to form a crank chamber 31 together with the cylinder block 20.

In front of the front housing 30, a pulley 32 connected to an external power source (not shown) such as an engine is rotatably installed, and the shaft 94 rotates in association with the rotation of the pulley 32.

The rear housing 80 is coupled to the rear of the cylinder block 20. At this time, in the rear housing 80, the discharge chamber 41 is formed along a position adjacent to the outer peripheral side edge of the rear housing 80 to selectively communicate with the cylinder bore 22.

And the suction port (not shown) is formed on one side of the rear housing 80, it is connected to the suction chamber 42 disposed in the central portion of the rear housing (80). However, the present invention is not limited thereto, and other positions may be possible depending on the type of compressor.

At this time, the valve plate 50 is interposed between the cylinder block 20 and the rear housing 80, the discharge chamber 41 and the cylinder bore 22 through the discharge port 51 formed in the valve plate 50 Communicating.

In addition, the swash plate 91 is installed on the shaft 94, and is connected to each piston 70 by a shoe 62 provided along an edge of the swash plate 91, and the piston is rotated by the swash plate 91. 70 is linearly reciprocated in the cylinder bore 22.

At this time, the angle of the swash plate 91 with respect to the shaft 94 is variable so that the amount of refrigerant discharged from the compressor 10 can be adjusted. For this purpose, the discharge chamber 41 and the crank chamber 31 communicate with each other. The opening degree of the flow path is controlled by a pressure control valve (not shown).

The conventional swash plate compressor of the above configuration has a structure of so-called radial symmetry in which a plurality of cylinder bores 22 formed in the cylinder block 20 are radially spaced about the shaft 94.

When the swash plate 91 is rotated through the structure as described above, the plurality of pistons 70 are moved to compress the fluid, and the valve door 52 is opened by the hydraulic pressure while the outlet of the valve plate 50 is opened ( The compressed fluid is pushed out to the discharge chamber 41 through 51.

Figure 3 is a view showing a friction material coating method for the base material of the sliding member for a compressor of the present invention, Figure 4 is a view showing a laminated structure of the sliding member for a compressor produced by FIG.

First, referring to FIG. 3, the friction material coating method of the sliding member for a compressor of the present invention may include a base material preparation process, a coating film preparation process, and a coating film bonding process.

First, the base material preparation process may be a step of preparing a base material of the sliding member for the compressor. Specifically, the base material preparation process may include a base material drawing or forging step and a base material shape processing step.

The base material drawing or forging step may be a step of forging the base material to a size corresponding to the sliding member for the compressor by a mechanical method of drawing, tapping, or pressing the base material through a mold. .

The drawn or forged base material may be prepared from a cylindrical base material such as a sliding member for a compressor.

And the base material shape processing step may be a step of cutting the drawn or forged base material to a length corresponding to the sliding member for the compressor.

The coating film preparation process may be a step of preparing a friction material coating film for coating the base material. Specifically, the coating film preparation process may include a friction material powder mixing step, friction material pressing step and friction material sintering step.

The friction material powder mixing step is before pressing the resin material and chemicals that are the raw materials of friction materials such as PTFE (Poly Tetra Fluoro Ethylene), Poly Phenylene Sulfide (PPS), Poly-Butylene-Terephthalate (PBT), Poly Propylene (PP), etc. The mixing may be performed at an appropriate ratio.

Next, the friction material pressing step may be a step of compressing the friction material powder mixed in the proper ratio using a compactor. The pressing step allows the friction material powder to be pressed more tightly so that the sintering action of the friction material powder is activated before the sintering step.

Next, the friction material sintering step may be a step of heating the compressed friction material powder so as to be firmly adhered to each other and solidified. Through the sintering action, the friction material powder is made into a film-like shape.

The coating film bonding process may be a step of embossing the surface of the base material, and integrally injection-bonding the base material and the friction material coating film. Specifically, the coating film bonding process may include a base material surface embossing treatment step, a base material surface coating film injection coating step and a coating film surface polishing step.

The substrate surface embossing may be a step of forming embossing by nano etching the surface of the substrate. This is to reduce the surface roughness of the base material surface, to improve the adhesion of the coating film to the base material surface.

Referring to FIG. 1, conventionally, a separate sintered material such as copper powder, a resin film, and the like, which serves as a bonding material by deteriorating roughness on a surface of a metal base material is coated, and a bonding material is applied. Lamination was performed to glue the coating film of the resin material on the base material. Here, the bonding force between the release material to the metal and the resin was determined by the kind of sintered material corresponding to the bonding material.

The present invention is different from the prior art by applying a method of improving the adhesion of the friction material of the resin material by applying a nano-etching embossing treatment on the surface of the metal base material instead of the method of bonding between the metal and the friction material using a conventional sintered material. have.

The base material surface coating film injection coating step may be a step of injection coating by bonding a friction material coating film to the surface of the embossed base material. That is, after the friction material coating film is bonded to the surface of the base material, it is a method of coating by injection molding.

Referring to Figure 1, conventionally, after bonding the friction material coating film to the base material using a sintered material, the base material is cut into a size corresponding to the sliding member for the compressor and formed into a shape as shown in FIG. 1a) occurred.

The present invention instead of the method of cutting, forming and bonding the friction material coating film to the conventional base material, first prepare a cylindrical base material cut to a size corresponding to the sliding member for the compressor in advance in the base material preparation process. And after the nano-etching embossing on the surface of the base material is bonded to the friction coating film. After the injection coating of the base material and the friction material coating film integrally through the injection machine, there is an advantageous effect that the slit (1a) does not occur in comparison with the prior art. If there are no slits, the gaps between the slits may occur, preventing the problem of deterioration of the product performance.

Thereafter, the coating film surface polishing step may be a step of improving the roughness by polishing the surface of the injection-coated friction material coating film using a polishing machine.

In addition, conventionally, after the friction material coating film is bonded, the base material is cut into a size corresponding to the sliding member for the compressor and formed into a shape corresponding to the sliding member for the compressor, wherein the sliding member for the compressor disclosed in FIG. In the case of forming a cylindrical shape as shown in 1), due to mechanical processing limitations, a full circle was not formed or a locally distorted circle shape occurred. In the case of the sliding member 1 for a compressor shown in FIG. 2A, the clearance between the driving shaft and the driving shaft may not be kept constant during long-term driving, which may cause a problem of increased vibration and reduced durability.

According to the present invention, since the base material and the friction material coating film are integrally injected into a predetermined shape by using an injection machine, the roundness can be increased compared to the prior art. This can reduce the friction loss due to the roundness mismatch between the parts.

The coating process of the present invention can be applied to steel base metal as well as other metal base materials such as Al, SUS, Ti without limitation, and in the case of applying a relatively light metal, it is associated with the way that a separate bonding material is not used, and also helps to reduce the weight Will be given.

In addition, the friction coating film may also be applied to various materials such as PPS, PBT, PP in addition to PTFE, it is possible to use environmentally friendly materials.

On the other hand, the coating structure of the sliding member for the compressor of the present invention is manufactured by the friction material coating method of the sliding member for the compressor, referring to Figure 4, may be composed of only the base material (S1) and friction material coating film (S3).

In FIG. 4 (a), a conventional coating structure manufactured by the coating process of FIG. 1 is disclosed. The conventional coating structure is laminated with a base material S1, a bonding material S2, and a friction material coating film S3. In contrast, the present invention is composed of a base material (S1) layer and a friction material coating film (S3) layer as shown in Figure 4 (b), the bonding material (S2) layer is omitted.

The surface of the base material (S1) may be embossed by nano-etching to increase the adhesion to the friction material coating film (S3).

Then, the friction material preparation process is performed, and the friction material powder is mixed, pressed, and sintered to manufacture the friction material coating film S3.

Then, the friction material coating film (S3) is the friction material coating film (S3) is bonded to the surface of the base material (S1), is integrally injection-coated with the base material (S1).

The coating method and the coating structure of the sliding member for the compressor of the present invention, as described above, by laminating only the base material (S1) layer and the friction material coating film (S3) layer, it is possible to shorten the friction material coating process compared to the conventional coating structure, This can lead to reduction of the manufacturing time and cost reduction of the sliding member for the compressor.

The above matters merely represent specific embodiments of the friction material coating method and the compressor of the sliding member for the compressor.

Therefore, it will be apparent to those skilled in the art that the present invention may be substituted and modified in various forms without departing from the spirit of the present invention as set forth in the claims below. do.

10: swash plate compressor
20: Cylinder block 21: Center bore
22: cylinder bore 30: front housing
31: crankcase 32: pulley
41: discharge chamber 42: suction chamber
50: valve plate 51: discharge port
52: valve door 62: shoe
70: piston 80: rear housing
91; Saphan 94: Shaft
100: slide bush
S1: Base material
S2: Bonding material
S3: friction material coating film

Claims (5)

In the friction material coating method of the sliding member for a compressor,
A base material preparation step of preparing a base material of the sliding member for a compressor;
Coating film preparation process for preparing a friction material coating film for coating the base material; And
Coating film bonding step of embossing the surface of the base material and integrally injection-bonding the base material and the friction material coating film;
Friction material coating method of the sliding member for a compressor comprising a.
The method of claim 1,
The base material preparation step,
Drawing or forging the base material to a size corresponding to a sliding member for a compressor; And
Processing the drawn or forged base metal into a shape corresponding to a sliding member for a compressor;
Friction material coating method of a sliding member for a compressor comprising a.
The method of claim 1,
The coating film preparation process,
Mixing the friction material powder;
Pressing the mixed friction material powder; And
Sintering the compacted friction material powder;
Friction material coating method of a sliding member for a compressor comprising a.
The method according to any one of claims 1 to 3,
The coating film bonding process,
Embossing the surface of the base material with nanoetching;
Bonding a friction material coating film to the surface of the embossed base material and integrally injection-coating it; And
Polishing the surface of the injection-coated friction material coating film;
Friction material coating method of a sliding member for a compressor comprising a.
Cylinder block;
A shaft disposed inside the cylinder block;
A swash plate connected to the shaft and configured to rotate in an oblique direction;
A piston connected to the swash plate and the shoe and performing a linear reciprocating motion;
A center bore formed in the cylinder block and supporting one end of the shaft; And
A slide bush disposed between the center bore and the shaft and manufactured by a friction material coating method of a sliding member for a compressor of claim 1;
Compressor comprising a.

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