KR20130019128A

KR20130019128A - Surface treatment method for swash plate of compressor and coating liquid therefor

Info

Publication number: KR20130019128A
Application number: KR20110081098A
Authority: KR
Inventors: 김율구; 김종희
Original assignee: 현대자동차주식회사
Priority date: 2011-08-16
Filing date: 2011-08-16
Publication date: 2013-02-26
Also published as: KR101786103B1

Abstract

The present invention applies a surface treatment having a low friction and wear resistance under high driving conditions under high surface pressure while using a material such as steel or Al alloy, and has sufficient durability and smooth operability at low cost. Allows you to configure

Description

Swash plate surface treatment method and coating liquid of compressor {SURFACE TREATMENT METHOD FOR SWASH PLATE OF COMPRESSOR AND COATING LIQUID THEREFOR}

The present invention relates to a surface treatment method of a swash plate used in a variable compressor and a technology related to a coating liquid for the surface treatment.

The swash plate type variable compressor is configured such that the pumping output is varied while the stroke length of the piston is changed by adjusting the inclination angle of the swash plate as in the following prior art document, and the connection between the swash plate and the piston is through the shoe on the piston. Since the edge of the swash plate and the shoe is continuously rotated between the swash plate and the shoe, the relative sliding movement is generated, and at the same time a strong pressure acts between the swash plate.

Therefore, the friction and wear characteristics of the swash plate play an important role in the efficient operation of the compressor, and in order to satisfy such mechanical properties in the past, a swash plate or a swash plate using brass to use MoS2 solid lubricant in steel and There is a problem that the swash plate using brass is an expensive material.

If the swash plate is made of steel or Al alloy, significant cost reduction can be expected, but since the material of the shoe, which causes friction with the swash plate, is a bearing steel, due to the joining or excessive friction between the same metals under high-speed high surface pressure driving conditions. There is a problem that ignition is very likely to occur.

KR 10-2000-0074329 A KR 10-2000-0069060 A

The present invention has been made to solve the above problems, by using a material such as steel or Al alloy, while applying a surface treatment having a low friction, wear resistance characteristics under high driving conditions under high pressure It is an object of the present invention to provide a swash plate surface treatment method and a coating liquid of a compressor for constituting a swash plate having sufficient durability and smooth operability at a low cost.

The swash plate surface treatment coating liquid of the compressor of the present invention for achieving the above object is

It is characterized in that it is prepared by mixing 0.1 to 10 parts by weight of diamond particles having a size of 50 to 500nm in a mixture of PAI and PTFE.

In addition, the swash plate surface treatment method of the compressor of the present invention

An roughness forming step of imparting surface roughness to the surface of the swash plate;

A coating step of spraying the coating liquid of claim 3 on the surface of the swash plate to which the surface roughness is given;

Drying step of drying the swash plate completed the coating step;

And a control unit.

The present invention, while using a material such as steel or Al alloy, by applying a surface treatment having a low friction, abrasion resistance under the environment driven at high speed under high surface pressure state, energy efficiency is increased, heat generation and noise is reduced, Improved adhesion resistance allows the construction of swash plate with sufficient durability and smooth operation at low cost.

1 is a view illustrating a swash plate and a shoe of a compressor to which the present invention is applied;
2 is a view illustrating a cross-sectional structure of the state in which the swash plate of Figure 1 is inserted into the shoe,
3 is a flowchart illustrating a swash plate surface treatment method of the compressor of the present invention.

1 shows a main part of a compressor in which a swash plate according to the present invention is used, the swash plate 1 is connected to the rotor 5 of the drive shaft 3, and a shoe for coupling the swash plate 1 to the piston ( 7 is shown separated from the piston 9 and the swash plate 1.

2 illustrates a state in which a swash plate 1 having a surface treatment by the surface treatment method of the present invention is bonded between the shoes 7 by using the coating solution according to the present invention, and the swash plate which contacts the shoe 7 ( The coating layer 11 is formed on both sides of 1), and the swash plate 1 inside is made of a metal base material such as steel or Al alloy.

Meanwhile, the swash plate surface treatment coating liquid of the compressor according to the present invention is prepared by mixing 0.1 to 10 parts by weight of diamond particles having a size of 50 to 500 nm in a mixed liquid of PAI (Polyamideimide) and PTFE (Polytetrafluoroethylene).

The mixed solution of PAI and PTFE is made by mixing 5 to 20 parts by weight of PAI and 20 to 60 parts by weight of PTFE. When the PAI part is 5 or less, it does not function as a binder. have. In addition, when PTFE is 20 parts by weight or less, the low friction characteristics cannot be sufficiently realized, and when the weight is 60 parts or more, the wear resistance is obvious.

The diamond particles are mixed at 0.1 to 10 parts by weight by bead milling to a size of 50 to 500 nm, and the particle size is 50 nm or less, so that the milling time is long and there is no process gain. Deteriorates the frictional wear characteristics by acting as an attacker. In addition, if the content of the diamond particles is less than 0.1 does not play a role as a composite material to improve the wear resistance, if more than 10 the diamond particles increase the phenomenon of attacking the counterpart material, which also worsens the friction wear characteristics .

The coating solution was viscosity-adjusted to a viscosity of 500 to 5000 cps to be suitable for spraying using a thinner consisting of NMP (N-methylpyrrolidone): xylene: MIBK (Methyl isobutyl ketone) = 6: 2: 2 or 6: 1: 3. This is done. If the viscosity is 500 or less, the coating liquid flows during the coating operation to ensure a sufficient coating thickness, and if the viscosity is 5000 or more, spraying is impossible.

The swash plate surface treatment method of the present invention for treating the surface of the swash plate using the coating solution as described above, as illustrated in Figure 3, roughness forming step (S10) to give a surface roughness to the surface of the swash plate; A coating step of spraying the coating solution on the surface of the swash plate to which the surface roughness is given (S20); It comprises a drying step (S30) for drying the swash plate (1) completed the coating step (S20).

In the roughness forming step (S10) to give a surface roughness of the surface roughness of the swash plate 1 in the range of Ra 0.5 to 1.5. The reason for giving the surface roughness to the swash plate 1 as described above is to improve the adhesion of the coating by the anchoring effect. At this time, if Ra is 0.5 or less, the adhesion is insufficient, and if Ra is 1.5 or more, the roughness of the surface after the coating becomes rough, which adversely affects the wear resistance of the coating.

The coating step (S20) is sprayed spaced apart from the swash plate (1) in the range of 50 to 100 cm. If the coating is carried out at a distance of 50 cm or less, the coating liquid may aggregate. If the coating is performed at a distance of 100 cm or more, the coating liquid is excessively lost.

The coating step (S20) is repeatedly performed to form a coating layer 11 having a thickness of at least 10 ㎛ or more on the surface of the swash plate (1). If the coating layer 11 is 10 μm or less, the base material may be exposed due to wear of the coating layer 11, and sintering may occur.

The drying step (S30) is to dry the swash plate (1) for 30 minutes or more in a drying furnace of 180 to 240 ℃. In this case, when the drying temperature is 180 ° C. or less, the coating layer 11 may not be sufficiently cured. When the drying temperature is 240 ° C. or more, the PTFE material may be decomposed or the base material may be deformed.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

One; Saphan
3; driving axle
5; Rotor
7; Shoe
9; piston
11; Coating layer
S10; Roughness formation stage
S20; Coating step
S30; Drying step

Claims

It is prepared by mixing 0.1 to 10 parts by weight of diamond particles having a size of 50 to 500 nm in a mixture of PAI and PTFE.
Swash plate surface treatment coating liquid of the compressor.

The method according to claim 1,
The mixture of PAI and PTFE is made by mixing 5 to 20 parts by weight of PAI and 20 to 60 parts by weight of PTFE.
Swash plate surface treatment coating liquid of the compressor.

The method according to claim 1,
The coating solution was viscosity controlled to a viscosity of 500 to 5000 cps to be suitable for spraying using a thinner consisting of NMP: xylene: MIBK = 6: 2: 2 or 6: 1: 3.
Swash plate surface treatment coating liquid of the compressor.

Roughness forming step (S10) to give a surface roughness on the surface of the swash plate (1);
A coating step (S20) of spraying the coating liquid of claim 3 on the surface of the swash plate (1) to which the surface roughness is given;
Drying step (S30) for drying the swash plate (1) completed the coating step (S20);
The swash plate surface treatment method of a compressor comprising a.

The method of claim 4,
In the roughness forming step (S10) to give a surface roughness of the surface roughness of the swash plate 1 in the range of Ra 0.5 to 1.5
A swash plate surface treatment method of a compressor, characterized in that.

The method of claim 4,
The coating step (S20) is to spray the spray gun spaced apart from the swash plate (1) in the range of 50 to 100 cm
A swash plate surface treatment method of a compressor, characterized in that.

The method of claim 6,
The coating step (S20) is to be carried out repeatedly to form a coating layer 11 having a thickness of at least 10 ㎛ or more on the surface of the swash plate (1)
A swash plate surface treatment method of a compressor, characterized in that.

The method of claim 4,
The drying step (S30) is to dry the swash plate (1) for 30 minutes or more in a drying furnace of 180 to 240 ℃
A swash plate surface treatment method of a compressor, characterized in that.

The swash plate of the compressor characterized by the surface treatment by the method of claim 4 using the coating solution of claim 1.

A compressor comprising the compressor swash plate (1) of claim 9.