JP3958118B2 - Scroll type fluid machine, scroll member and method of manufacturing the member - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an orbiting scroll member formed of an aluminum alloy and / or a surface treatment method of a fixed scroll member, a scroll member subjected to the surface treatment, and a scroll fluid machine using the scroll member, in particular, a scroll compressor. About.
[0002]
[Prior art]
A refrigerant compression part of a scroll type fluid machine, for example, a refrigerant scroll compressor, is constituted by a fixed scroll and a revolving scroll, which are engaged with each other to form a compression mechanism. 7A and 7B are explanatory views of the shape of a fixed scroll scroll member or a general scroll compressor. FIG. 7A is a plan view of the scroll member, and FIG. 7B is a cross-sectional view taken along line AA in FIG.
[0003]
In FIG. 7, the scroll member 10 is formed by spiral teeth called a wrap 11 and an end plate 12 that holds the wrap 11, and the side surfaces (wrap 11) of the scroll members 10 of both the fixed scroll and the orbiting scroll (wrap 11). The room surrounded by the contact portion between the wrap surfaces 11a) and the contact portion between the end plate 12 and the tooth tip (wrap top surface 11b) of the other scroll member 10 is sucked and compressed by the orbiting scroll. It has a structure that repeats. For this reason, contact and sliding between the wrap surfaces 11a, contact between the wrap top surface 11b and the surface of the end plate 12 of the mating scroll member 10 (end plate surface 12a), and sliding occur, which is a countermeasure against wear. It is necessary.
[0004]
In general, when a scroll compressor is used as a compressor for an automobile air conditioner, an aluminum alloy is often used because weight reduction is required. However, in scroll compressors, both fixed and sliding scrolls, which are in mesh with each other, and aluminum scrolls are both made of aluminum alloy. .
[0005]
In the operation of the scroll compressor, the compression operation is performed by the orbiting motion of the orbiting scroll meshed with the fixed scroll. The scroll top surface 11b contacts and slides. Therefore, a groove 11c is provided in the lap top surface 11b of the orbiting scroll, and a member having good sliding property called a chip seal 13 formed of resin is attached to the groove 11c, so that the lap top surface 11b and the mating side Consideration is made so that the end plate surface 12a is not in direct contact.
[0006]
[Problems to be solved by the invention]
In the scroll compressor as described above, conventionally, a surface treatment is performed to form a hard film on the surface of one of the wrap 11 and the end plate 12 of the fixed scroll or the orbiting scroll. The wear resistance is greatly improved and adhesion is prevented from occurring, but the tip seal 13 is also effective when the orbiting scroll does not incline, but when the inclining orbiting is performed. The end plate surface 12a of the fixed scroll and the lap top surface 11b are in direct contact with each other. In this case as well, if there is lubricating oil, it will operate without problems, but depending on the stop condition of the scroll compressor, the lubricating oil may be interrupted, and it has become clear that adhesion is likely to occur due to sliding at this time. .
[0007]
Therefore, the applicant of the present invention has proposed the scroll member shown in FIG. 6, a method for manufacturing the scroll member, and a scroll type fluid machine using this member as a countermeasure, and has also filed a patent application. Next, the contents of this prior art will be described.
[0008]
FIG. 6 is an enlarged cross-sectional view of the surface of the scroll member. As described above, in a scroll type fluid machine, for example, a scroll compressor, one of the wrap 11 and the end plate 12 of either an aluminum alloy fixed scroll or an orbiting scroll. When forming a hard film on the surface, a hard anodizing treatment is used. As shown in FIG. 6, as a feature of the hard anodizing treatment, a hard anodized film formed on the surface of the aluminum alloy base material 1 is used. (Hereinafter simply referred to as “anodized film”) 2 has micropores called pores 3. In this example, as shown in FIG. 6, the pores 3 of the anodized film 2 of the aluminum alloy base material 1 of the scroll member 10 are impregnated with tin 5 as a lubricant, and even when the lubricating oil is exhausted, the lubricating performance is exhibited. A self-lubricating surface treatment film that can be formed is formed.
[0009]
From the structure of the anodized film 2 in which a layer called a barrier layer 6 is present at the bottom (the aluminum alloy base material 1 side) of the pore 3, a scroll member that has been hard anodized using the property of the barrier layer 6 that can be energized. 10 is set on the cathode in an electrolytic solution containing tin ions, and electrolysis is performed through the barrier layer 6, and tin 5 is deposited and filled in the pores 3 of the anodized film 2. Tin 5 is one of soft materials having a self-lubricating action.
[0010]
By forming an impregnated material of tin 5 in the anodic oxide film 2, the self-lubricating action of the tin 5 keeps the lubricating action on the surface of the anodic oxide film 2 even when the lubricating oil is depleted and does not lead to adhesion. Members and scroll compressor products can be obtained.
[0011]
Therefore, the present invention improves the scroll member according to the prior art described above, the manufacturing method of this member, further improves the performance, reduces the chip clearance, eliminates the performance problem, improves the initial conformability, It is an object of the present invention to provide a scroll type fluid machine including an aluminum alloy scroll having a film that can exhibit lubricating performance even when the lubricating oil is depleted, and a method for manufacturing the scroll member and the scroll member.
[0012]
[Means for Solving the Problems]
The present invention provides the following means in order to solve the aforementioned problems.
[0013]
(1) A scroll type fluid machine comprising a pair of aluminum alloy fixed scroll and orbiting scroll, wherein a hard anodized film is formed on the surface of either the fixed scroll or the orbiting scroll, Next, tin impregnation treatment was performed, and in the state where tin was deposited on the pore bottom in the film, pore opening treatment by etching with sodium hydroxide was performed, A scroll characterized in that only a surface portion of a pore generated in the film is provided with an enlarged opening that is larger than the diameter of the pore, and a self-lubricating surface-treated film impregnated with tin is formed in the pore. Type fluid machine.
[0014]
(2) A scroll member made of an aluminum alloy of a scroll type fluid machine, wherein a hard anodized film is formed on the surface of the scroll member; Next, tin impregnation treatment was performed, and in the state where tin was deposited on the pore bottom in the film, pore opening treatment by etching with sodium hydroxide was performed, A scroll characterized in that only a surface portion of a pore generated in the film is provided with an enlarged opening that is larger than the diameter of the pore, and a self-lubricating surface-treated film impregnated with tin is formed in the pore. Element.
[0015]
(3) A hard anodized film is formed on the surface of the scroll member made of an aluminum alloy of the scroll type fluid machine, and then the scroll member is electrolyzed as a cathode side in an aqueous solution containing sulfuric acid first tin ions, Pore formed in hard anodized film bottom To deposit tin In the state An enlarged opening that is larger than the diameter of the pore by immersing the surface layer portion of the hard anodized film in an aqueous sodium hydroxide solution for a predetermined time and etching the surface layer portion of the pore; And forming a self-lubricating surface-treated film in which tin is impregnated in the hard anodized film.
[0016]
(4) forming a hard anodized film on the surface of the scroll member made of aluminum alloy of the scroll type fluid machine; In a state where tin was impregnated and tin was deposited on the pore bottom in the film, An enlarged opening that is larger than the diameter of the pore is obtained by immersing the surface layer of the hard anodized film in an aqueous solution of sodium hydroxide for a predetermined time and etching the surface layer of the pore formed in the hard anodized film. The scroll member is formed only on the surface layer of the pore, and then the scroll member is electrolyzed as a cathode side in an aqueous solution containing sulfuric acid first tin ions to deposit tin in the pore, A method for producing a scroll member, comprising forming a self-lubricating surface-treated film impregnated with tin.
[0017]
(5) The method for manufacturing a scroll member according to (3) or (4), wherein the etching and the subsequent electrolysis are performed a plurality of times.
[0018]
(6) The enlarged diameter of the pore is larger than the diameter of the non-expanded portion of the pore, and is a maximum of twice and not more than twice, and the shape of the enlarged portion gradually increases toward the bottom. The scroll according to (1), wherein the scroll has a decreasing funnel shape, and the depth is a value obtained by dividing the depth of the entire pore by the depth of the pore enlargement opening and is 1.25 or more and 5 or less. Type fluid machine.
[0019]
(7) The enlarged diameter of the pore is larger than the diameter of the non-expanded portion of the pore, and is a maximum of twice and not more than twice, and the shape of the enlarged portion gradually increases toward the bottom. The scroll according to (2), wherein the depth is a decreasing funnel shape, and the depth is a value obtained by dividing the depth of the entire pore by the depth of the pore enlargement opening and is 1.25 or more and 5 or less. Element.
[0020]
(8) The diameter of the enlarged pore is larger than the diameter of the non-expanded portion of the pore and is a maximum of twice and not more than twice, and the shape of the enlarged portion gradually increases toward the bottom. The depth of the funnel is reduced, and the depth is obtained by dividing the depth of the entire pore by the depth of the pore expansion opening and is from 1.25 to 5 (5) to (5) ). The manufacturing method of the scroll member in any one of.
[0021]
In the scroll type fluid machine of (1) of the present invention, the diameter of the pore is enlarged in the surface layer portion, and in this portion, the relatively high altitude and the coating with high tin concentration are compatible with the self-lubricating action of tin and Even when the lubricating oil is depleted between the fixed scroll and the orbiting scroll, it is possible to obtain a scroll type fluid machine that maintains the lubricating action between the two scrolls and does not cause adhesion.
[0022]
In the scroll member of (2) of the present invention, the diameter of the pores in the member is enlarged in the surface layer portion, and a scroll member having a self-lubricating action possessed by the tin and having a conformability and a tin is obtained. When the member is used in a scroll machine, even when the lubricity is depleted, the lubrication action between the fixed and orbiting scroll is maintained and adhesion does not occur.
[0023]
In the production method (3) of the present invention, a production method capable of easily producing a scroll member having tin conformability and self-lubricating action can be realized, and electrolysis in an aqueous solution containing sulfuric acid first tin and aqueous sodium hydroxide solution There is no complicated process by the process of etching by immersion in the inside, and the scroll member can be manufactured on the integrated production line.
[0024]
In the manufacturing method of (4) of the present invention, after the formation of the hard anodized film, etching of the surface layer portion with sodium hydroxide is performed without performing electrolysis to precipitate tin, and then the pore opening is enlarged, and then electrolysis is performed. Therefore, there is no initial electrolysis step, and the process can be simplified as compared with the above invention (3).
[0025]
In the manufacturing method of (5) of the present invention, the etching and electrolysis steps are repeated a plurality of times, so that the pore opening is sufficiently expanded by etching, and the tin is completely filled into the surface layer. The quality of the scroll member can be further improved.
[0026]
In (6), (7) and (8) of the present invention, the diameter of the enlarged portion of the pore opening in the member surface layer portion formed by etching with sodium hydroxide is larger than the original pore diameter, and is twice as much as the maximum. And the depth of the pore is sufficiently open in the range of 5 to 5/4 of the total pore length / depth, that is, in the range of 20% to 80% of the total length. Due to the relatively low altitude and high tin concentration coating, the self-lubricating action of tin and tin maintains the lubricating action between the scrolls even when the lubricant is depleted between the fixed scroll and the orbiting scroll, leading to adhesion. Thus, a scroll member manufacturing method can be realized in which a scroll type fluid machine can be obtained and a scroll member used in the fluid machine can be easily obtained. Note that the enlarged opening may have a substantially funnel shape, and the present invention is not limited to the funnel shape, and the same effect can be obtained even in a hemispherical shape, a parabolic rotating body shape, and the like. It goes without saying that it enters.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is an enlarged cross-sectional view of a surface portion of a scroll member according to an embodiment of the present invention. In the figure, reference numerals 1 to 3, 5 and 6 are the same as those of the conventional example shown in FIG.
[0028]
First, the hard anodized film will be described. About this scroll member 10, as hard anodizing treatment, sulfuric acid 300 g / L (L is liter, hereinafter referred to as “L”), dissolved aluminum 5 g / L in an aqueous solution having a liquid composition of 5 ° C., Current density 2A / dm ² , Electrolysis for 20 minutes (the scroll member 10 is set as an object to be processed on the anode), and an anodic oxide film 2 of about 20 μm is formed.
[0029]
As a feature of the hard anodizing treatment, there are micropores called pores in the hard anodized film 2 (hereinafter simply referred to as “anodized film”) formed on the surface of the aluminum alloy base material 1. In the present embodiment, as shown in FIG. 1, an enlarged opening 20 is formed in the opening of the pore 3 of the anodized film 2 of the aluminum alloy base material 1 of the scroll member 10, and as a lubricant in the pore 3. A self-lubricating surface treatment film is formed which is impregnated with tin 5 and can exhibit lubricating performance even when the lubricating oil is depleted.
[0030]
As described in the prior art of FIG. 6, tin impregnation is performed by depositing and filling tin 5 in the pore 3 by electrolysis through the barrier layer 6 at the bottom of the pore of the anodized film. Here, by subjecting the anodic oxide film 2 of the surface layer portion to alkali etching, the surface layer portion of the film becomes porous, and the enlarged opening 20 of FIG. 1 is formed, and the hardness of the film of this portion becomes lower than usual. However, normal hardness can be maintained from the center to the bottom of the film. By electrolyzing the tin in this state, a film with an increased tin concentration can be obtained on the surface layer portion. Tin 5 is one of soft materials having a self-lubricating action.
[0031]
By forming the impregnated material of tin 5 in the anodized film 2, the self-lubricating action of tin 5 has an enlarged opening 20 than that of the prior art shown in FIG. Even in this case, it is possible to obtain a scroll member and a scroll compressor product that retains the lubricating action more effectively than the prior art on the surface of the anodized film 2 and does not lead to adhesion.
[0032]
Next, the manufacturing process of the scroll member described above will be described. First, the scroll member 10 is formed with the anodic oxide film 2, and the first tin electrolysis is performed. At this time, the tin electrolyte was an aqueous solution mainly composed of sulfuric acid and cresol sulfonic acid in addition to the first tin sulfate, and the scroll member 10 as the object to be processed was set in the cathode and electrolysis was performed. Processing conditions are liquid temperature 5 ° C, current density 100mA / dm. ² For 20 minutes.
[0033]
Thereafter, in order to make the surface layer portion of the anodized film 2 porous, it was immersed in an aqueous solution at 25 to 30 ° C. containing 1 g / L of sodium hydroxide for 240 to 360 seconds. Thereafter, the second tin electrolysis was carried out for 30 minutes (liquid composition and temperature were the same as the first time), and then the etching treatment was performed, and the third tin electrolysis was carried out for 40 minutes (liquid composition and temperature were the same as the first time).
[0034]
As a result, the surface layer portion of the anodic oxide film 2 became porous and became a pore having the enlarged opening portion 20 of FIG. 1, and the hardness of this portion was about 150 to 200 HV. Further, an impregnated material of tin 5 was formed in the pore 3, and the tin concentration could be increased particularly in the surface layer portion. The construction range is the entire surface of the lapping surface and the end plate surface.
[0035]
The scroll member 10 manufactured as described above was incorporated into an actual scroll compressor, the chip clearance was set narrower than the conventional setting, and the conditions under which the lubricating oil was exhausted were set, and an operation test was performed. As a result, the scroll member 10 according to the present embodiment has no adhesion and no problem has occurred as compared with the situation in which the conventional hard anodized film and the bare material are adhered in a short time.
[0036]
This is the effect of the anodized film 2 and the tin 5 present in the film. By the presence of tin 5 in the anodic oxide film 2, a self-lubricating surface treatment film is formed, and even when there is no lubricating oil, the lubricating oil in the scroll compressor system circulates until it reaches the same part. The operation can be continued without causing adhesion, and the chip clearance is set narrower than before, but because the familiarity is good and the lubricity is good due to the high concentration of tin in the porous part of the anodized film on the surface layer part, Even when such a situation occurs frequently, no damage occurs.
[0037]
Next, the shape of the pores of the scroll member 10 manufactured by the above process will be described with reference to FIG. FIG. 2 is a partially enlarged view of FIG. 1, where the total length of the pore 3 is a, the diameter of the enlarged opening is b, the depth of the enlarged opening is c, and the diameter of the pore 3 is d. ) = (100 to 20) to (100 to 80), preferably (a to c) = (100 to 25) to (100 to 50). Also, b> d, preferably 1.1d ≦ b ≦ 2d, more preferably 1.4d ≦ b ≦ 2d, and more preferably b = 2d. Here, if it is in the range of (a vs. c) = (100 vs. 20) to (100 vs. 80), the effect of the enlarged opening can be sufficiently obtained. When this ratio is less than (100: 20), the effect of the enlarged opening is difficult to obtain, and conversely, when it exceeds (100: 80), the strength of the anodized film 2 is lowered. The range in which the strength reduction of the anodic oxide film 2 can be suppressed to the extent that there is no actual harm while exhibiting the effect of the enlarged opening is from (100 to 25) to (100 to 50). Further, if 1.1d> b, the effect of expanding the opening cannot be sufficiently obtained, or there is a problem in processing accuracy, but if 1.1d ≦ b, there is no such problem, and 1.4d ≦ If b, the effect of enlarging the opening is greatly obtained, and if b = 2d, the effect is further enhanced, and thus such a range is determined. However, when b> 2d, since the enlarged opening 20 is too large and the strength of the anodized film 2 may be unnecessarily lowered, the limit of the range is b = 2d. This can be easily seen from FIG.
[0038]
FIG. 3 is a block diagram showing the processing steps of the scroll member 10. First, the hard anodizing process P1 described above is performed, and in P2, tin electrolysis is first performed on the pore 3 to perform the Sn impregnation process P2. . Thereafter, in P3, a pore opening process S1 is performed by immersion in an aqueous sodium hydroxide solution and an etching process, and then a Sn impregnation process S2 is performed. If necessary, the process P4 by S1 and S2 is repeated and the process ends.
[0039]
In the above steps, there are a method of performing treatment with P1, P2, P3, and P4 and a method of eliminating P2 and performing treatment with P1, P3, and P4. The latter is preferable because it requires fewer steps, but depending on the manufacturing conditions. A suitable method can be selected from both methods as required.
[0040]
FIG. 4 is an explanatory diagram illustrating the manufacturing process of the scroll member according to the embodiment of the present invention. As described above, first, the hard anodizing treatment is performed at P1, and the aluminum alloy base material 1 is subjected to the anodized film 2. Form. The anodic oxide film 2 is formed with micropores 3 as described above. Next, Sn impregnation is performed at P2, and tin 5 is gradually formed on the bottom surface inside the pore 3 by electrolysis. Next, in P3, first, an enlarged opening 20 is formed in the surface layer portion of the pore 3 by etching with sodium hydroxide in S1, and then tin 5 is deposited and filled in the pore 3 by electrolysis in S2, and the treatment is performed. Complete. The process P3 including S1 and S2 may be performed as P4 and P5 as necessary.
[0041]
FIG. 5 is a diagram for explaining a comparison with respect to various forms of scroll members. FIG. 5A shows the present invention, in which an anodized film 2 is formed on an aluminum alloy base material, and an enlarged opening 20 is formed in a pore 3. Thus, tin 5 is filled. (B) is the one with no enlarged opening 20 in the form of (A), (C) is one in which the diameter of the pore 3 is enlarged to satisfy d ′> d, and (D) is filled with tin 5 in the pore 3. It does not have, and there is no expansion opening part.
[0042]
Comparing each of the above-mentioned forms, the lubricity is most favorable with (A) having an enlarged opening 20 and (C) where d ′> d, and the film hardness is the best. There is not much difference between (A) to (D). When these are comprehensively judged, the material of (A) of the present invention has good lubricity and has a coating hardness, and it is understood that these are the best scroll members among these forms. In FIG. 5, double circles of symbols indicate appropriate, triangles indicate acceptable, and oblique crosses indicate inappropriate. Those within the scope of the present invention are indicated by double circles.
[0043]
As described above, in the embodiment of the present invention, the enlarged opening 20 is provided in the pore 3 and the tin 5 is filled, so that the lubricating performance can be exhibited even when the lubricating oil is depleted. A scroll provided with a scroll member 10 having a self-lubricating surface treatment film capable of improving performance, and a method of manufacturing the scroll member 10 and the scroll member 10 are also provided. It goes without saying that the present invention is not limited to this embodiment, and various modifications may be made to its specific configuration and structure.
[0044]
In the embodiment described above, the case where the enlarged opening 20 has a funnel shape, that is, a substantially conical shape has been described. However, the present invention is not limited to this, but a hemispherical shape or a parabolic rotator is provided. Needless to say, even a shape such as a shape falls within the range.
[0045]
【The invention's effect】
The scroll type fluid machine of the present invention is (1) a scroll type fluid machine comprising a pair of fixed scrolls made of aluminum alloy and a turning scroll, on the surface of either the fixed scroll or the turning scroll. Forming a hard anodized film, Next, tin impregnation treatment was performed, and in the state where tin was deposited on the pore bottom in the film, pore opening treatment by etching with sodium hydroxide was performed, Only the surface layer portion of the pore generated in the coating is provided with an enlarged opening that is larger than the diameter of the pore, and a self-lubricating surface treatment coating impregnated with tin is formed in the pore.
[0046]
With the above configuration, the pore diameter has been enlarged in the surface layer, and in this part, the relatively high altitude tin film and the self-lubricating action of tin are compatible with the fixed scroll and the orbiting scroll. Even when the lubricating oil is depleted, it is possible to obtain a scroll type fluid machine that maintains the lubricating action between both scrolls and does not lead to adhesion.
[0047]
The scroll member of the present invention is (2) a scroll member made of an aluminum alloy of a scroll type fluid machine, wherein a hard anodized film is formed on the surface of the scroll member, Next, tin impregnation treatment was performed, and in the state where tin was deposited on the pore bottom in the film, pore opening treatment by etching with sodium hydroxide was performed, Only the surface layer portion of the pore generated in the coating is provided with an enlarged opening that is larger than the diameter of the pore, and a self-lubricating surface treatment coating impregnated with tin is formed in the pore.
[0048]
According to the scroll member, the diameter of the pore is enlarged in the surface layer portion, and a scroll member having a self-lubricating action with a conformability and tin is obtained by a film having a high tin concentration, and this scroll member was used in a scroll machine. In this case, even when the lubricity is depleted, the lubrication action between the fixed and orbiting scrolls is maintained and adhesion does not occur.
[0049]
The method of manufacturing a scroll member according to the present invention includes (3) forming a hard anodized film on the surface of an aluminum alloy scroll member of a scroll type fluid machine, and the scroll member contains first tin ions. Pore generated in the hard anodized film by electrolysis as cathode side in aqueous solution bottom To deposit tin In the state An enlarged opening that is larger than the diameter of the pore by immersing the surface layer portion of the hard anodized film in an aqueous sodium hydroxide solution for a predetermined time and etching the surface layer portion of the pore; The self-lubricating surface treatment film in which tin is impregnated in the hard anodized film is then formed by performing the electrolysis.
[0050]
In the above method, it is possible to realize a manufacturing method capable of easily manufacturing a scroll member having a conformability of tin and a self-lubricating action, and electrolysis in an aqueous solution containing sulfuric acid first tin and etching by immersion in an aqueous sodium hydroxide solution. With this process, there is no complicated process, and it is possible to manufacture the scroll member on the integrated production line.
[0051]
A further method for manufacturing a scroll member according to the present invention includes (4) forming a hard anodized film on the surface of the scroll member made of an aluminum alloy of the scroll type fluid machine, In a state where tin was impregnated and tin was deposited on the pore bottom in the film, An enlarged opening that is larger than the diameter of the pore is obtained by immersing the surface layer of the hard anodized film in an aqueous sodium hydroxide solution for a predetermined time and etching the surface layer of the pore formed in the hard anodized film. The scroll member is formed only on the surface layer of the pore, and then the scroll member is electrolyzed as a cathode side in an aqueous solution containing sulfuric acid first tin ions to deposit tin in the pore, and in the hard anodized film It is characterized by forming a self-lubricating surface treatment film impregnated with tin.
[0052]
According to the above method, after the formation of the hard anodized film, without performing electrolysis for depositing tin, the surface layer portion is etched with sodium hydroxide to enlarge the pore opening, and then electrolysis is performed. There is no first electrolysis process, and the process can be simplified compared to the invention of (3) above.
[0053]
In the manufacturing method of (5) of the present invention, the etching and electrolysis steps are repeated a plurality of times, so that the pore opening is sufficiently expanded by etching, and the tin is completely filled into the surface layer. The quality of the scroll member can be further improved.
[0054]
In (6), (7) and (8) of the present invention, the diameter of the enlarged portion of the pore opening in the member surface layer portion formed by etching with sodium hydroxide is larger than the original pore diameter, and is twice as much as the maximum. And the depth of the pore is sufficiently open in the range of 5 to 5/4 of the total pore length / depth, that is, in the range of 20% to 80% of the total length. Due to the relatively low altitude and high tin concentration coating, the self-lubricating action of tin and tin maintains the lubricating action between the scrolls even when the lubricant is depleted between the fixed scroll and the orbiting scroll, leading to adhesion. Thus, a scroll member manufacturing method can be realized in which a scroll type fluid machine can be obtained and a scroll member used in the fluid machine can be easily obtained.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a surface portion of a scroll member according to an embodiment of the present invention.
FIG. 2 is a partially enlarged view of FIG.
FIG. 3 is a block diagram showing processing steps for a scroll member according to an embodiment of the present invention.
FIG. 4 is an explanatory diagram showing a manufacturing process according to an embodiment of the present invention.
FIG. 5 is an explanatory view showing a comparison of various forms of scroll members including the present invention.
FIG. 6 is an enlarged cross-sectional view of a surface portion of a scroll member according to the prior art of the present invention.
7A and 7B are explanatory views of the shape of a general scroll member, where FIG. 7A is a plan view of the scroll member, and FIG. 7B is a cross-sectional view taken along line AA in FIG.
[Explanation of symbols]
1 Aluminum alloy base material
2 Anodized film
3 pores
5 Tin
6 Barrier layer
10 Scroll member
11 laps
20 Enlarged opening

Claims (8)

A scroll type fluid machine comprising a pair of fixed scrolls and orbiting scrolls made of an aluminum alloy, wherein a hard anodized film is formed on the surface of either the fixed scroll or the orbiting scroll , In the state in which tin impregnation treatment was performed and tin was deposited on the pore bottom in the film, pore opening treatment by etching with sodium hydroxide was performed, so that the diameter of the pore was formed only on the surface layer portion of the pore generated in the film. A scroll type fluid machine comprising a further enlarged opening and a self-lubricating surface-treated film impregnated with tin in the pore. A scroll member made of an aluminum alloy for a scroll type fluid machine, wherein a hard anodized film is formed on the surface of the scroll member, and then tin impregnation is performed to deposit tin on the pore bottom in the film. In the caulked state, by performing pore opening treatment by etching sodium hydroxide , an enlarged opening that is larger than the diameter of the pore is provided only in the surface layer portion of the pore generated in the film, and the tin is placed in the pore. A scroll member comprising an impregnated self-lubricating surface treatment film. A hard anodizing film is formed on the surface of an aluminum alloy scroll member of a scroll type fluid machine, and then the scroll member is electrolyzed as an anode side in an aqueous solution containing sulfuric acid first tin ions, in a state in which allowed precipitation of pore bottom NiSuzu occurring during treatment film, the pores by by immersing a predetermined time of the surface layer portion of the hard anodized film in an aqueous solution of sodium hydroxide to etch the surface portion of the pore An enlarged opening that is larger than the diameter of the pore is formed only on the surface layer of the pore, and then the electrolysis is performed to form a self-lubricating surface-treated film in which tin is impregnated in the hard anodized film. A method for manufacturing a scroll member. A hard anodizing film is formed on the surface of an aluminum alloy scroll member of a scroll type fluid machine, and then tin impregnation is performed, and tin is deposited on the pore bottom in the film. An enlarged opening that is larger than the diameter of the pore is formed by immersing the surface layer portion of the oxidation treatment film in a sodium hydroxide aqueous solution for a predetermined time and etching the surface layer portion of the pore generated in the hard anodization treatment film. Next, the scroll member is electrolyzed as a cathode side in an aqueous solution containing sulfuric acid first tin ions, tin is deposited in the pores, and tin is deposited in the hard anodized film. A method for producing a scroll member, comprising forming an impregnated self-lubricating surface treatment film.   The method for manufacturing a scroll member according to claim 3 or 4, wherein the etching and the subsequent electrolysis are performed a plurality of times.   The enlarged diameter of the pore is larger than the diameter of the non-expanded portion of the pore and is in the range of up to 2 times and less than 2 times, and the shape of the enlarged portion gradually decreases toward the bottom. 2. The scroll type fluid machine according to claim 1, wherein the depth is a value obtained by dividing the depth of the entire pore by the depth of the enlarged pore opening and is 1.25 or more and 5 or less. .   The enlarged diameter of the pore is larger than the diameter of the non-expanded portion of the pore and is in the range of up to 2 times and less than 2 times, and the shape of the enlarged portion gradually decreases toward the bottom. 3. The scroll member according to claim 2, wherein the depth is a value obtained by dividing the depth of the entire pore by the depth of the pore enlargement opening and is 1.25 or more and 5 or less.   The enlarged diameter of the pore is larger than the diameter of the non-expanded portion of the pore and is in the range of up to 2 times and less than 2 times, and the shape of the enlarged portion gradually decreases toward the bottom. 6. The depth according to claim 3, wherein a value obtained by dividing the depth of the entire pore by the depth of the pore enlargement opening is 1.25 or more and 5 or less. The manufacturing method of the scroll member of description.

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