JP2000087891A - Sliding member and compressor therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding member excellent in wear resistance and lubricating ability using material excellent in machinability, and a compressor provided with this sliding member at a low cost. SOLUTION: This sliding member 1 has a nitrosulphurized layer on the surface of a base substance formed of pressed aluminum-chromium-molybdenum steel(SACM). Desired shape can therefore be easily obtained, and the nitrosulphurized layer can be formed in a short time so as to provide the sliding member 1 excellent in wear resistance and lubricating ability, at a low cost. A hollow part is formed in the sliding member 1 to further reduce the weight of the sliding member 1 and to improve follow-up performance during sliding. In addition, a cylinder 2 and a rotor 5 are formed of SACM, and nitrosulphurized layers are formed at the sliding faces thereof so as to further improve wear resistance and lubricating performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding member having excellent surface wear resistance and lubricity, and a compressor provided with the sliding member.

[0002]

2. Description of the Related Art Surface hardening to improve wear resistance, lubricity, seizure resistance, etc. by surface-treating sliding members such as cylinder valves, pistons, valves in air conditioners, refrigerators, hydraulic pumps, gas circuit breakers, and the like. As a processing method, a nitrosulphurizing method is known. Sliding characteristics of steel members,
In other words, a number of surface treatment methods have been proposed to improve wear resistance, lubricity and seizure resistance, etc. This is a surface modification method that maintains good sliding characteristics even in a lubricated region in an environment where a severe sliding state is obtained. Specifically, a gas sulfide nitriding method in which a material to be processed is heated and nitrided in an atmosphere mainly containing a nitriding gas, or a salt bath in which a material to be processed is heated in a nitriding salt bath to perform a nitriding treatment In general, a sulphonitriding method or an ion sulphonitriding method is performed. According to these sulphonitriding methods, sulfides and nitrides are formed on the surface of the material to be processed, and the surface hardness thereof is extremely increased, thereby increasing the wear resistance and improving the lubricity.

[0003] Iron-based steel materials are widely used as materials to be processed. Iron (Fe) atoms, which are the base material of iron-based steel, have a strong bond with sulfur atoms (S) and nitrogen atoms (N), and an iron nitride (Fe _2-4 N) layer formed on the surface by heat treatment This is because wear resistance and lubricity are extremely improved by the iron or iron sulfide (FeS, FeS ₂ ) layer. An iron-based steel material contains iron as a main component and contains trace amounts of Cr, Mo, W, Co, V, Si, C, and the like. Specific steel materials include alloy tool steel (SK).
S, SKD, SKT, SKH) and carbon tool steel (SK) are used.

Japanese Patent Application No. 62-75083 discloses a high speed tool steel SKH9 (sliding member) for forming a vane (sliding member) which slides in contact with an outer peripheral surface of a roller which rotates eccentrically in a cylinder of a compressor. A compressor capable of coping with a high load and a high rotation speed by improving the abrasion resistance, galling resistance and lubricity of a vane by subjecting the surface of the JIS to sulphonitriding treatment has been proposed.

When a vane is manufactured using high-speed tool steel as a raw material, a processing step as shown in FIG. 6 is performed. First, the raw material (SKH9) is cut with a cutting tool to roughly remove a square bar. Next, if necessary, after drilling a predetermined portion with a drill, the square bar is quenched. Next, rotary grinding is performed to equalize the thickness of the rectangular bar, and further, the four sides are shaped and ground to obtain a rectangular parallelepiped rectangular bar having excellent surface accuracy and dimensional accuracy. Next, one surface of the square member is R-ground to form an arcuate curved portion. This curved portion is used as a sliding portion. In these grinding steps, a diamond grindstone capable of grinding a material is used. By the steps so far, a substrate having substantially the same shape as the shape of the final product is formed. Thereafter, by subjecting this substrate to nitrosulphurizing treatment,
An oxynitrided layer having a higher hardness and a higher wear resistance than the material (SKH9) is formed to a depth of about 100 μm.

On the other hand, cast iron has been conventionally used as a material for cylinders and rollers constituting a compressor.

[0007]

However, SKH
9 and other alloy tool steels and carbon tool steels are extremely poor in workability due to the very high hardness of the material itself, and require long-time processing when cutting and grinding to achieve final dimensional accuracy. . In addition, since the tool steel has a low diffusion of the nitrided layer into the material, a long-time heat treatment is required until a desired nitrided layer depth is formed. In addition, since the tool steel has a relatively large mass per volume, if it is used to produce a sliding member that slides while repeatedly oscillating, such as a vane of a compressor, the followability is poor. When the sliding member is urged against the rotating body by a spring, there is a disadvantage that the spring pressure is reduced in a short period of time or the spring is worn out early. In addition, since the tool steel has a relatively high material cost, there is a problem that the cost of parts obtained by nitrosulfurizing the tool steel and the cost of products using this part increase.

Further, even if the vane of the compressor is formed of a material having high hardness and excellent wear resistance, the hardness of the roller which slides on the vane and the inner surface of the cylinder which slides on the vane are smaller than the hardness of the vane. If it is too low, the rollers and cylinders wear and the life of the compressor is shortened. Therefore, the characteristic required of the compressor is that the vanes do not wear and at the same time the rollers and cylinders do not wear.

In view of the above-mentioned circumstances, the present invention makes it possible to easily obtain a desired shape from a material having excellent workability, and to achieve a very high abrasion resistance and a nitriding effect by performing a nitrosulphurizing treatment. An object is to provide a sliding member having excellent lubrication. In addition, it is another object of the present invention to provide a sliding member having excellent followability by reducing the weight of the sliding member.

Further, the present invention provides a compressor having excellent durability by providing a sliding member (vane) having excellent wear resistance, and a rotating body (roller) and a cylinder having excellent wear resistance. The purpose is to:

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a sliding member having a sulfided nitride layer formed on the surface of a sliding portion which slides in contact with a rotating body. The sliding member is characterized in that the oxynitrided layer is formed on the surface of a base made of press-formed aluminum chromium molybdenum steel (hereinafter, referred to as SACM).

In the present invention, the sliding member is formed by pressing a substrate made of SACM excellent in workability by press working and subjecting the surface to nitrosulphurizing treatment. A desired shape can be easily obtained beforehand, a desired nitrided layer depth can be obtained in a short time, and a sliding member excellent in wear resistance and lubricity can be provided at low cost. . Moreover, since the weight per volume of SACM is smaller than that of SKH, the weight of the product itself using the sliding member can be reduced. In addition, when the sliding member is brought into sliding contact with the rotating body, the followability is extremely good.

In the present invention, the sliding member has a hollow portion inside the sliding portion that slides on the rotating body. The hollow part is SA
It is formed by pressing a plate material made of CM. With such a structure, the weight of the sliding member can be further reduced, and further reduction in weight and improvement in followability can be achieved.

In the present invention, the sliding member is composed of 1.3 to 1.7% by weight of Cr,
A sulfided nitrided layer is formed on the surface of a substrate made of SACM containing 0.7 to 1.2% Al and 0.15 to 0.3% Mo. The sulfided nitrided layer formed on the surface of the SACM having such a composition has extremely high hardness, excellent wear resistance, and can provide a sliding member excellent in lubricity.

[0015] A compressor according to the present invention is provided with a cylinder, a rotating body that rotates inside the cylinder, and a housing that is housed in a housing formed on the inner surface of the cylinder and one end of which is in contact with the outer peripheral surface of the rotating body. In a compressor provided with a sliding member (vane) that slides in contact with the sliding member, the sliding member is characterized in that an oxynitrided layer is formed on a surface of a substrate made of SACM.

[0016] Since SACM is excellent in workability and can form a sulfur-nitrided layer in a short time, a sliding member excellent in wear resistance and lubricity can be obtained at low cost. Therefore, it is possible to provide a compressor that has a longer life and a lower cost. Further, since the specific gravity of the SACM is light, the weight of the compressor itself can be reduced, and the followability when the sliding member and the rotating body are brought into sliding contact with each other becomes extremely good.

In the present invention, the sliding member of the compressor is characterized in that a sulfided nitrided layer is formed on the surface of a press-formed SACM substrate. Therefore, a sliding member having a desired shape can be easily obtained, and the cost can be reduced. In addition, since the weight of the SACM is lighter than that of the conventionally used SKH9, the followability of the sliding member can be improved.

Further, in the present invention, the sliding member of the compressor has a hollow portion inside a sliding portion that comes into contact with a rotating body. The hollow portion is formed by press working, and the weight of the sliding member can be further reduced by the hollow portion. Accordingly, it is possible to reduce the mass of the compressor, which is a product, and to facilitate handling of the sliding member in the process of assembling the compressor. In addition, since the capacity of the hollow part is large and the sulfided nitride layer is formed up to the inner wall surface of the hollow part, the biasing spring held inside the hollow part can be changed to a large one, and the wear of the spring is significantly reduced Thus, the durability of the spring can be improved.

Further, in the compressor according to the present invention, the cylinder is made of SACM, and the oxynitrided layer is formed on at least the surface in sliding contact with the sliding member and the surface in sliding contact with the rotating body. Therefore, not only the sliding member but also the sliding surface of the cylinder are excellent in wear resistance and lubricity, so that the product life of the compressor can be extended.

Further, in the compressor according to the present invention, the rotating body is made of SACM, and the oxynitrided layer is formed on the outer peripheral surface. Therefore, not only the sliding member but also the outer peripheral surface of the rotating body, that is, the sliding contact surface with the cylinder and the sliding member is excellent in wear resistance and lubricity, and the product life of the compressor can be prolonged.

Further, in the compressor according to the present invention, the sliding member has a weight ratio of 1.3 to 1.7% of Cr and 0.7 to 1.2% of Fe to the main component. A
1, a sulfided nitrided layer is formed on the surface of a substrate made of SACM containing 0.15 to 0.3% Mo. The sulfided nitrided layer formed on the surface of the SACM having such a composition has extremely high hardness, excellent wear resistance, and can provide a sliding member with excellent lubricity, thereby extending the product life of the compressor. can do.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a sliding member according to an embodiment of the present invention.

(Structure of Sliding Member) FIG. 1 shows an embodiment of a sliding member of the present invention used for a cylinder valve, a piston, a valve, and the like in an air conditioner, a refrigerator, a hydraulic pump, a gas circuit breaker, and the like. FIGS. 1A and 1B are perspective views showing the same sliding member 10 from different angles. The sliding member 10 is obtained by pressing a plate material made of aluminum chromium molybdenum steel (JIS standard SACM) to form a base, and subjecting the base to nitrosulphurizing treatment to form a sulphonitrided layer on the surface. It is. Sliding member 1
Numeral 0 has a flat plate portion 12 and a curved portion 11 curved in an arc shape, and the outer peripheral surface of the curved portion 11 functions as a sliding portion that slides on the outer peripheral surface of a rotating body (not shown). The sliding member 10
Depending on the installation condition of the outer surface 12a, 1
2b may also be used as a sliding surface. The sliding member 10 is provided on the end face 12c opposite to the curved portion 11.
A through-hole 13 for accommodating an elastic member such as a spring for urging the pressing member against the rotating body is provided.

In this embodiment, JIS standard SACM645 is used as a base material of the sliding member 10. SA
CM645 includes Cr, Mo, Al,
It is an alloy containing a small amount of C, Si, Mn, P, S, and the like. In particular, Cr is 1.3 to 1.7% and Mo is 0.15%.
０．３0.30%, and 0.7-1.2% of Al is preferable. Hardness and tensile strength are increased by including Cr and Mo, and malleability is improved by including Al.

(Manufacturing Process of Sliding Member) The sliding member 10 shown in FIG. 1 is manufactured through, for example, a manufacturing process as shown in FIG. First, a sheet material made of SACM645 having a sheet thickness of about 3.0 mm, which has been previously tempered to JIS standard HRC, is finished by rotary grinding to make the sheet thickness uniform. Since SACM645 has a lower hardness than SKH9, the grindstone used at this time can be sufficiently ground with an inexpensive standard grindstone. Next, the plate material is punched out by a press die to roughly remove a square bar. In such a process, the SAC
Since the hardness of M645 is relatively low, it can be dealt with by punching with a press die. Next, while maintaining the thickness of the roughened square bar, the four sheared surfaces are pressed again with a shaving die to increase the flatness and verticality of the sheared surfaces (rectangular shape processing). Next, one surface of the square member is R-ground to form an arcuate curved portion 11. In this grinding process, a standard grindstone can be used. Then, a hole is drilled in the end surface 12c opposite to the curved portion 11 by drilling to obtain a substrate having substantially the same shape as the final shape. In addition,
After the drilling step, a vibration barrel may be applied to polish the surface of the substrate.

Thereafter, the substrate is subjected to a nitrosulphurizing treatment to form a nitrosulphurized layer on the surface of the substrate. As a method for the nitrosulphurizing treatment, for example, a nitriding gas NH _{3 for} thermally dissociating nitrogen and a sulfide gas H ₂ S gas for thermally dissociating sulfur at around 500 ° C. The inside is heated to about 500 ° C., and nitrogen and sulfur in the nascent phase due to thermal dissociation are reacted with Fe on the surface layer of the SACM to form a nitrosulphurized layer on the surface of the substrate. Further, as another nitrosulphidizing method, a sulfide gas of a predetermined concentration H ₂ S
Was introduced into the reactor with a carrier gas together with a predetermined concentration of nitriding gas NH ₃ , subjected to a primary heat treatment at a temperature of about 500 ° C.
A method of gradually lowering the temperature to about ° C and performing a secondary heat treatment at the temperature may be used.

By the above-mentioned sulphinitriding, SAC
A 0.02-0.1 mm oxynitrided layer composed of an iron sulfide layer and an iron nitride layer is formed on the surface of a substrate made of M645, and the sliding member 10 according to the present invention is completed. In the sulphinitriding process, by extending the heating time,
It is possible to make the depth of the oxynitridation layer deeper. After the nitrosulphurizing treatment, the sliding member 10 may be subjected to a vibration barrel to polish the surface of the base.

The sliding member 10 is made of S which is excellent in workability.
It is made by press-forming a plate material made of ACM and subjecting its surface to nitrosulphurizing treatment.
It is possible to easily obtain the sliding member 10 having a desired shape at low cost. Moreover, the lubricating property of the surface is enhanced by the iron sulfide layer formed on the surface of the sliding member 10, and when the sliding member slides on the rotating body, extremely smooth sliding can be performed without damaging the rotating body. In addition, the hardness is increased by the presence of the iron nitride layer, and the wear resistance is significantly improved. Also,
SACM has a smaller mass per volume than tool steel (SKH), so that when the sliding member 10 is brought into sliding contact with the rotating body, the followability is extremely good.

Further, by subjecting the material SACM to the nitrosulphurizing treatment, the corrosion resistance of the nitrosulphurized layer is improved as compared with the corrosion resistance of the SACM itself. Therefore, the sliding member 10 according to the present invention has excellent corrosion resistance.

(Comparison with Various Steel Materials) FIG. 3 shows the relationship between various steel materials and the surface hardness in the nitrosulphuritriding and the carbon content in various steel materials.
It is a graph which showed r content. As can be seen from FIG.
Until the Cr content in the steel material reaches about 4%, the hardness of the nitrosulfurized steel material increases as the Cr content increases. However, the hardness of the steel material hardly increases from the vicinity where the Cr content exceeds 4%. Cr is heated to nitrogen N
This is because if the content is too large, the reaction becomes saturated. Further, a steel material having a Cr content of more than 4% has a high hardness before the sulphinitriding treatment, but is inferior in workability.

The material of the sliding member according to the present invention, aluminum chromium molybdenum steel (SACM) is about 0.8.
~ 1.7% Cr, especially SACM6
No. 45 contains 1.3 to 1.7% Cr. It should be noted that, as shown in FIG. 3, the surface hardness after the sulphinitriding of SACM645 is equal to or higher than the surface hardness after the sulphinitriding of a steel material containing 4% or more of Cr (Hv 1000 ~ 1200). That is, SACM645 is excellent in workability at the stage before the nitrosulphurizing treatment, and is extremely hardened after the sulphinitriding treatment to be modified into a steel material having excellent wear resistance and excellent slidability. Therefore, the sliding member made of the SACM645 can provide the above-described effect.

(Other Embodiments) FIGS. 4A and 4B
FIG. 4 is a perspective view showing another embodiment of the sliding member of the present invention. The sliding member 10 shown in FIG. 1 has a rough shape formed by punching a plate material (SACM645) having a uniform thickness with a press die. "" Has a rough shape formed by drawing a plate material made of SACM645. That is, the sliding members 10 'and 10 "have a sliding portion 11 having a curved surface and a It has rectangular side surfaces 12a and 12b communicating with each other, and a hollow portion 14 formed inside the sliding portion 11 and the side surfaces 12a and 12b. Due to the presence of the hollow portion 14, the sliding members 10 ', 1
0 ”can be further reduced in weight, so that the followability during sliding is improved.
By performing the oxynitriding treatment on 0 ″, a oxynitrided layer is formed up to the inner wall surface of the hollow portion 14.
4 can suppress wear of the biasing spring housed inside. In addition, since a large spring can be used by increasing the space inside the hollow portion 14, the durability of the spring is improved. In addition, the sliding member 10 ″ in FIG. 4B is formed with a rib that protrudes from one side surface 12 a toward the opposing side surface 12 a in order to increase the strength in the thickness direction.

(Structure of Compressor) FIG. 5 is a sectional view of an embodiment in which the sliding member according to the present invention is applied as a vane of a compressor. In FIG. 5, the compressor includes a cylinder 2 having a vane storage section 3 on the inner surface of a circular hole 7, a roller 5 as a rotating body that is driven by a crankshaft 4 to rotate eccentrically, and a vane storage section. A vane 1 housed inside the vane 3 and sliding on the outer peripheral surface of the roller 5 and the inner wall surface of the vane housing portion 3; and a vane 1 installed in the vane housing portion 3 for urging the vane 1 toward the center of the cylinder 2. Coil spring 6 for pressing the tip of vane 1 against roller 5
And In such a compressor, the vane 1 uses the sliding member 10 described in the above embodiment. That is, the vane 1 is formed by forming a nitrosulphurized layer on the surface of a substrate made of SACM.

Since SACM is excellent in workability and can form a sulfided nitrided layer in a short time, it is possible to provide a compressor vane 1 excellent in wear resistance and lubricity at low cost. Further, since the specific gravity of the SACM is light, the followability when the vane 1 and the roller 5 are brought into sliding contact with each other is extremely good, and generation of galling friction can be prevented. Furthermore, the corrosion resistance of the oxynitrided layer formed by subjecting the SACM to nitrosulphurizing treatment is superior to the corrosion resistance of the SACM itself. The material of the vane 1 is SA
CM645 is most preferred.

The vane 1 of the compressor is
It is preferable that a base material obtained by press-forming a plate material made of M is provided with a nitrosulphurized layer on the surface.
By press forming, it is possible to obtain a substrate of the same shape at low cost and in a short time. Therefore, a sliding member having a desired shape can be easily obtained, and the cost can be reduced. In addition, SK
Since the mass of the SACM is lighter than that of H9, the followability of the sliding member can be improved.

In the compressor of the present invention, the vanes 10 ', 1 having a hollow portion 14 as shown in FIG.
0 "may be adopted. The presence of the hollow portion 14 can further reduce the weight of the vanes 10 'and 10", thereby contributing to a reduction in the mass of the compressor and in the process of assembling the compressor. Vane handling is easier. Also, since the capacity of the hollow portion 14 is large,
The biasing spring held inside the hollow portion 14 can be changed to a large one, and the durability of the spring can be improved.
As a result, the durability of the compressor itself is also improved.

On the other hand, in the compressor according to the present invention, the cylinder 2 is made of SACM, and an oxynitrided layer is formed on the inner surface thereof. Here, the inner surface of the cylinder 2 includes the inner wall surface of the vane housing portion 3 and the inner peripheral surface of the circular hole 7 in which the roller 5 and the cylinder 2 slide. Further, the roller 5 as a rotating body is also made of SACM, and an oxynitrided layer is formed on the outer peripheral surface thereof.

With the eccentric rotation of the roller 5, the vane 1 accommodated in the vane accommodating portion 3 moves forward and backward and the coil spring 6 expands and contracts. While sliding, the inner peripheral surface of the circular hole 7 is in sliding contact with the outer peripheral surface of the roller 5, and the inner wall surface of the vane housing portion 3 is in sliding contact with the side surface of the vane 1 and the outer peripheral surface of the coil spring 6. Therefore, by forming the oxynitrided layer on these sliding contact portions, the wear resistance and lubricity of each sliding contact portion are significantly improved. That is, the presence of the iron nitride layer in each sliding contact portion increases the surface hardness and improves wear resistance, and the presence of the iron sulfide layer improves lubricity. Wear suppression can be promoted in an effective manner. As a result, in the compressor having such a structure, it is possible to prolong the product life.

Although the invention made by the inventor has been specifically described based on the embodiment, the invention is not limited to the above embodiment and can be variously modified without departing from the gist thereof. Needless to say, there is. For example, in the above-described embodiment, the vane 1, the cylinder 2, and the roller 5 as a rotating body are each configured by SACM, and the form in which the sulfided nitride layer is formed on at least the sliding surfaces of the members is shown. Depending on the required durability performance, only the vane 1 and the cylinder 2 or only the vane 1 and the roller 5 may be subjected to the nitrosulphurizing treatment. However, as in the above embodiment, the durability performance can be improved most by performing the nitrosulphurizing treatment on all of the vane 1, the cylinder 2, and the roller 5.

[0040]

As described above, in the sliding member of the present invention, the desired shape can be easily obtained because the sulphonitrided layer is formed on the surface of the press-formed substrate made of SACM. It is possible to form the oxynitrided layer in a short time and to provide a sliding member excellent in wear resistance and lubricity at low cost. Further, by forming a hollow portion in the sliding member, the weight of the sliding member can be reduced, so that followability during sliding is improved.

The compressor according to the present invention has a SACM
Since a sliding member (vane) having a sulfided nitrided layer formed on the surface of a substrate made of is provided, a sliding member excellent in lubricity and wear resistance can be obtained at low cost. The followability when the moving member and the rotating body (roller) are brought into sliding contact with each other is extremely good, and the occurrence of galling friction can be prevented. In addition, by forming a hollow portion in the sliding member, the followability during sliding is improved, and the size of the biasing spring housed in the hollow portion can be increased. Life can be extended.

In addition to the sliding member, the cylinder is SA
The wear resistance and lubricity of each sliding contact part are improved by forming a CM and forming a sulfided nitrided layer on the sliding contact surface between the cylinder and the sliding member, and on the sliding contact surface between the cylinder and the rotating body. I do. Therefore, the product life of the compressor can be prolonged.

Further, not only the sliding member but also the rotating body is made of SACM, and the abrasion-nitrided layer is formed on the outer peripheral surface of the rotating body, so that the abrasion resistance and lubricity at each sliding contact portion are improved. . Therefore, the product life of the compressor can be prolonged. In particular, the sliding member, the cylinder, and the rotating body are all made of SACM, and by forming the oxynitrided layer on the sliding contact part of each part, it is possible to obtain the most excellent wear resistance and lubricating performance. Therefore, the product life of the compressor can be further extended.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sliding member according to an embodiment of the present invention, and (a) and (b) are perspective views showing the same sliding member from different angles.

FIG. 2 is a process diagram showing a manufacturing process of a sliding member according to the present invention.

FIG. 3 shows the relationship between various steel materials and surface hardness in nitrosulphurizing,
3 is a graph showing the Cr content in various steel materials.

FIG. 4 is a perspective view of a sliding member according to another embodiment of the present invention.

FIG. 5 is a sectional view of a compressor according to the embodiment of the present invention.

FIG. 6 is a process diagram showing a conventional manufacturing process of a sliding member.

[Explanation of symbols]

 Reference Signs List 1, 10, 10 ', 10 "sliding member (vane) 2 cylinder 3 vane storage portion 4 crankshaft 5 roller 6 coil spring 7 circular hole 11 curved portion (sliding portion) 12 flat plate portion 13 through hole 14 hollow portion

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16C 33/12 F16C 33/12 Z

Claims (9)

[Claims] 1. A sliding member having a sulfided nitride layer formed on the surface of a sliding portion which slides in contact with a rotating body, wherein the sliding member is formed of a press-formed aluminum chromium molybdenum steel substrate. A sliding member comprising the oxynitrided layer formed on a surface. 2. The sliding member according to claim 1, further comprising a hollow portion inside the sliding portion that slides with the rotating body. 3. The sliding member has a weight ratio of 1.3 to 1.7% of Cr, 0.7 to 1.2 with respect to Fe as a main component.
The sliding member according to claim 1 or 2, wherein a sulfided nitrided layer is formed on a surface of a substrate made of aluminum chromium molybdenum steel containing 0.1% Al and 0.15% to 0.3% Mo. . 4. A cylinder, a rotating body that rotates in the cylinder, and a housing that is housed in a housing formed on an inner surface of the cylinder and one end of which is in contact with an outer peripheral surface of the rotating body and slides. Wherein the sliding member has a sulfided nitrided layer formed on the surface of a substrate made of aluminum chromium molybdenum steel. 5. The compressor according to claim 4, wherein the sliding member has a sulfided nitrided layer formed on a surface of a base formed of press-formed aluminum chromium molybdenum steel. 6. The compressor according to claim 5, wherein the sliding member has a hollow portion inside the sliding portion that slides with the rotating body. 7. The cylinder according to claim 4, wherein the cylinder is made of aluminum chromium molybdenum steel, and a oxynitrided layer is formed on at least a surface in sliding contact with the sliding member and a surface in sliding contact with the rotating body. 7. The compressor according to any one of 6. 8. The compressor according to claim 4, wherein the rotating body is made of aluminum chromium molybdenum steel, and has a sulfided nitrided layer formed on an outer peripheral surface. 9. The sliding member has a weight ratio of 1.3 to 1.7% of Cr, 0.7 to 1.2 with respect to Fe as a main component.
The sulphonitrided layer is formed on the surface of a substrate made of aluminum chromium molybdenum steel containing 0.1% Al and 0.15% to 0.3% Mo. Compressor.