CN210919827U - Metal sliding component - Google Patents
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- CN210919827U CN210919827U CN201921122995.3U CN201921122995U CN210919827U CN 210919827 U CN210919827 U CN 210919827U CN 201921122995 U CN201921122995 U CN 201921122995U CN 210919827 U CN210919827 U CN 210919827U
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Abstract
The utility model relates to a metal sliding component. The metal sliding member includes a metal base layer, and a first surface layer located above the metal base layer and a second surface layer located between the first surface layer and the metal base layer. Wherein the first surface layer is made of a material with a low friction coefficient or/and high wear resistance, and the material of the second surface layer comprises the same elements as the material of the first surface layer, and the elements are selected from any one or more of sulfur, carbon, nitrogen and fluorine. The first surface layer has the characteristics of low friction coefficient and high wear resistance, and the first surface layer is not easy to fall off.
Description
Technical Field
The present invention relates to a metallic sliding member which can be used as a sliding bearing, which is particularly suitable for working under difficult conditions and environments of high load, and the application of metallic sliding members in abrasive environments and in abrasive environmental conditions which may occur.
Background
Metallic sliding bearings find application in a number of technical fields, which techniques advantageously include, for example: mining machinery, farm machinery, transportation vehicles, steel and nonferrous metal manufacturing, and the like. Due to the requirements of the technical field in which they are used, bearings must have good friction and wear behavior characteristics, while at the same time they should allow a low frequency of grease replenishment, even allowing only one application of grease at the time of assembly.
In order to ensure the working performance of the sliding bearing, the prior art carries out special treatment on the bearing by the following scheme. In one approach, the metal bearing is subjected to a single surface treatment. The surface treatment is, for example, a phosphating treatment, a vulcanization treatment, a carburizing treatment, a nitriding treatment, a carbonitriding treatment or the like. In the phosphating process, it improves the lubrication effect by creating a surface layer of iron phosphate on the surface of the metal bearing. The vulcanization treatment method is to obtain a ferrous sulfide (FeS) layer on the surface of the ferroalloy bearing, so that the treated component has low friction, wear resistance and seizure resistance. The surface treatment layer obtained by other surface treatment methods such as carburizing/nitriding/carbonitriding reduces the friction coefficient of the friction surface of the iron alloy bearing to a certain extent, or the generated carbon/nitrogen compound improves the surface hardness of the iron alloy and enhances the wear resistance. However, under the condition of high load, the friction coefficient is large, the wear resistance is insufficient, and the torque of machine equipment is too large, and even the bearing is locked.
In addition, the bearing performance can be improved by forming a surface layer on the bearing surface by physical deposition (PVD), Chemical Vapor Deposition (CVD), or the like. The surface layer material formed by the above physical deposition (PVD), chemical vapor deposition or the like includes transition metal sulfides, nitrides, carbides, diamond like films (DLC) and the like. Such surface layers have found a large number of applications in the field of low-load coatings due to their very low coefficient of friction or high wear resistance. However, under high load, the surface layer may be flaked off to cause a sharp decrease in the friction performance of the bearing.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned defect according to prior art's slide bearing, the utility model aims to provide a can show the coefficient of friction that reduces, possesses good wear resistance and better reliability's metal sliding component simultaneously.
This object is achieved by a metal sliding member according to the present invention. The metal component includes a metal base layer and a first surface layer over the metal base layer. Wherein the first surface layer is configured as a working surface of the metallic sliding member. Furthermore, the metal sliding member further comprises a second surface layer located between the first surface layer and the metal base layer. The first surface layer is made of a material having a low friction coefficient or/and a high wear resistance. The material of the second surface layer contains the same elements as the material of the first surface layer, wherein the elements are selected from any one or more of sulfur, carbon, nitrogen and fluorine.
According to the metallic sliding member of the above-described form, the first surface layer has the characteristics of low friction coefficient or/and high wear resistance, and therefore the metallic sliding member has a small friction coefficient while having good wear resistance. The same elements between the first surface layer and the second surface layer can ensure that interface elements between the first surface layer and the second surface layer are diffused to form chemical combination, so that the first surface layer and the second surface layer are combined into a whole tightly, and the falling-off condition of the first surface layer is avoided.
According to a preferred embodiment of the invention, the second surface layer is made of a material having a low coefficient of friction and being resistant to seizure. Thus, the metal sliding member can be normally operated for a certain period of time, even if the first surface layer is worn out and the second surface layer is exposed, throughout the life cycle of the metal sliding member. In addition, under other extreme conditions, such as when the first surface layer is completely or partially detached due to overload or abrasion, the second surface layer can prevent the sliding member from locking with the shaft, and ensure that the shaft can continue to move under low-friction conditions.
According to a preferred embodiment of the present invention, the second surface layer is a surface layer formed on the metal substrate layer by a carburizing treatment, a nitriding treatment, a sulfurizing treatment, a phosphating treatment or a fluorination treatment.
According to a preferred embodiment of the present invention, the second surface layer includes a permeable layer penetrating into the metal substrate layer and a compound layer located on an upper portion of the permeable layer, and a main portion of the compound layer is any one or more of carbide, nitride, sulfide, phosphide, or fluoride.
Advantageously, in the metal sliding member formed by the carburizing treatment, the nitriding treatment, the sulfurizing treatment, the phosphating treatment or the fluorination treatment, part of carbon, nitrogen, sulfur, phosphorus or fluorine permeates into the metal surface layer to cause a significant change in the metallographic structure of the metal surface layer at the position, and provides effective support for the first surface layer; meanwhile, the carbide, nitride, sulfide, phosphide or fluoride formed by the infiltrated elements of carbon, nitrogen, sulfur, phosphorus or fluorine and iron element has low friction coefficient and high anti-seizure property.
According to a preferred embodiment of the present invention, the material of the first surface layer comprises any one or more of a metal sulfide, a metal nitride, a metal carbide, and a carbonaceous substance mainly composed of carbon, wherein the carbonaceous substance mainly composed of carbon comprises any one or more of WC, SiC, DLC, diamond, graphene, graphite, or amorphous carbon.
According to a preferred embodiment of the present invention, the first surface layer comprises any one or more of polytetrafluoroethylene, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene propylene copolymer, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer, polyimide, polyether ether ketone, ultra high molecular weight polyethylene, polyamide, polyoxymethylene or polyphenylene sulfide.
According to a preferred embodiment of the present invention, the metal sulfide is MoS2、MnS、WS2Any one or more of ZnS, CuS, FeS, PbS or AgS.
According to a preferred embodiment of the present invention, the metal nitride is any one or more of TiN, TiCN, CrN, TiAlN.
According to a preferred embodiment of the present invention, the metal sliding member further comprises a textured groove or a plurality of grooves for storing a lubricating medium, wherein the grooves extend from the first surface layer to the metal base layer, and a plurality of the grooves are independent of each other or communicate with each other. The reticulate pattern grooves are of a net structure formed by criss-cross arranged grooves. The grooves are communicated with each other, and the working surface of the metal sliding component can be effectively lubricated everywhere.
When the sliding shaft is used, a lubricating medium (lubricating grease or lubricating oil) is firstly stored in the groove of the metal sliding component, and then the corresponding shaft is assembled. The grease or oil in the groove forms a lubricating film between the metal sliding member and the shaft by the action of squeezing or friction heating on the metal sliding member. Furthermore, the inventors have found that providing the depth of the groove to extend from the first surface layer to the metal base layer can provide a sufficient amount of grease without excess grease on the basis of satisfying the structural strength of the metal sliding member.
According to a preferred embodiment of the present invention, the thickness D1 of the first surface layer satisfies the condition: d1 is more than or equal to 1 mu m and less than or equal to 20 mu m.
According to a preferred embodiment of the present invention, the thickness D1 of the first surface layer satisfies the condition: d1 is more than or equal to 2 mu m and less than or equal to 5 mu m.
According to a preferred embodiment of the invention, the thickness D2 of the permeable layer satisfies the condition: d2 is more than or equal to 20 mu m.
According to a preferred embodiment of the invention, the thickness D3 of the compound layer satisfies the condition: d3 is more than or equal to 1 μm.
According to a preferred embodiment of the invention, the roughness Ra of the surface of the second surface layer facing the first surface layer satisfies the condition: ra is 3.2 μm or less, more preferably Ra is 0.8. mu.m or less.
The inventors have further surprisingly found that the probability of the first surface layer of the metallic sliding member falling off is further significantly reduced, provided that the second surface layer formed by the carburizing treatment, the nitriding treatment, the sulfurizing treatment, the phosphating treatment or the fluorination treatment is subjected to secondary finish grinding to reduce the surface roughness of the second surface layer. Through further research, the inventors found that if the second surface layer is not refined, the rough surface thereof may cause uneven surface pressure of the second surface layer, and that there is an overpressure condition locally, and therefore, different positions of the second surface layer generate significantly different deformation amounts, and finally, the local first surface layer generates excessive plastic deformation and falls off; further, the inventors have also found that, when the variation in roughness of the second surface layer at different positions is too large in a grease or oil-lubricated state, it is possible to cause a local interruption of the oil film so that the relatively moving surfaces between the metallic sliding member and the shaft which are in relative motion are not separated (adhered to each other), resulting in an increase in the friction coefficient, which is another factor causing the first surface layer to be likely to come off. Further experiments have demonstrated that setting the roughness Ra of the second surface layer to Ra ≦ 3.2 μm, more preferably Ra ≦ 0.8 μm is sufficient to ensure the normal use of the metallic sliding member.
According to a preferred embodiment of the present invention, the hardness of the second surface layer is not less than HRC45 and not more than HRC 55. More preferably, the hardness of the second surface layer is not less than HRC48 and not more than HRC 52. Thereby, the second surface layer is able to form an effective support for the first surface layer.
According to a preferred embodiment of the invention, the second surface layer is formed by infiltration of a solid, liquid or gas into the metal substrate layer.
According to a preferred embodiment of the invention, the cross-section of the groove is circular, oval or polygonal.
In addition, the present disclosure also discloses a preparation method of each of the above metal sliding members, the preparation method including:
step one, processing a groove for storing a lubricating medium on the surface of a metal substrate layer;
performing carburizing treatment, nitriding treatment, sulfurizing treatment, phosphating treatment or fluorination treatment on the surface of the metal substrate layer to form a second surface layer;
and step three, forming the first surface layer on the surface of the second surface layer through a deposition process or a spraying process.
Preferably, the production method further includes a fourth step interposed between the second step and the third step, the fourth step finishing the formed second surface layer so that a roughness Ra of a surface of the second surface layer facing the first surface layer satisfies a condition: ra is less than or equal to 3.2 mu m. More preferably, Ra is ≦ 0.83.2 μm.
According to a preferred embodiment, the deposition process is physical deposition (PVD), Chemical Vapor Deposition (CVD) or plasma enhanced chemical vapor deposition (PACVD).
According to a preferred embodiment, the carburizing treatment is a low-temperature ion carburizing treatment process, wherein the treatment temperature T1 of the low-temperature ion carburizing treatment process is as follows: t1 is more than or equal to 450 ℃ and less than or equal to 550 ℃, and the treatment time P1 is as follows: p1 is more than or equal to 1h and less than or equal to 8 h.
According to a preferred embodiment, the nitriding treatment adopts a low-temperature ion nitriding treatment process, wherein the treatment temperature T2 of the low-temperature ion nitriding treatment process is as follows: t2 is more than or equal to 300 ℃ and less than or equal to 450 ℃, and the treatment time P2 is as follows: p2 is more than or equal to 1h and less than or equal to 8 h.
According to a preferred embodiment, the treatment temperature T3 of the sulfurization treatment is: t3 is more than or equal to 140 ℃ and less than or equal to 300 ℃, and the treatment time P3 is as follows: p3 is more than or equal to 1h and less than or equal to 4 h.
According to a preferred embodiment, the fluorination process comprises:
placing the primary finished product with the groove into the ferrate fluoride for soaking for P4, wherein the raw materials for preparing the ferrate fluoride comprise KF and HNO3、(NH4)S2O8And FeCl3And the pH value PH of the fluoferrite is as follows: the PH value is more than or equal to 1 and less than or equal to 6, and the soaking time P4 is as follows: p3 is more than or equal to 1h and less than or equal to 4h, and the soaking temperature T4 is as follows: t4 is more than or equal to 10 ℃ and less than or equal to 40 ℃.
According to a preferred embodiment, the spraying is selected from any one of the following processes:
① MoS2Spraying onto the second surface layer, baking at T5 for P5, and spraying MoS2And baking for 1, 2 or 3 times, wherein T5 is: t5 is more than or equal to 100 ℃ and less than or equal to 200 ℃, and P5 is as follows: p5 is more than or equal to 1h and less than or equal to 4 h;
②, spraying polytetrafluoroethylene on the second surface layer, then placing the metal sliding component in a temperature T6 environment for maintaining the time P6, and repeating the steps of spraying polytetrafluoroethylene and maintaining for a plurality of times until the thickness D1 of the second surface layer meets the condition that D1 is more than or equal to 2 microns and less than or equal to 5 microns, wherein T6 is more than or equal to 100 ℃ and less than or equal to T6 and less than or equal to 400 ℃, and P6 is more than or equal to 1h and less than or equal to P6 and less than or equal to 8 h.
According to a preferred embodiment, when the deposition process is chemical vapor deposition, the process temperature T7 of the deposition process is: t7 is more than or equal to 400 ℃ and less than or equal to 600 ℃, and the treatment pressure P7 is as follows: 900Mpa is more than or equal to P7 is more than or equal to 1200 Mpa.
According to the utility model discloses a metal sliding component. The metal sliding member has a metal base layer, and a first surface layer located above the metal base layer and a second surface layer located between the first surface layer and the metal base layer. Wherein the first surface layer is made of a material having a low coefficient of friction or/and a high wear resistance, and the material of the second surface layer comprises the same elements as the material of the first surface layer, the elements being selected from sulfur, carbon, nitrogen or fluorine. The first surface layer has the characteristics of low friction coefficient and high wear resistance, and the first surface layer is not easy to fall off.
Drawings
For a better understanding of the above and other objects, features, advantages and functions of the present invention, reference should be made to the preferred embodiments illustrated in the accompanying drawings. Like reference numerals in the drawings refer to like parts. It will be appreciated by persons skilled in the art that the drawings are intended to illustrate preferred embodiments of the invention without any limiting effect on the scope of the invention, and that the various components in the drawings are not to scale.
Figure 1 is a schematic longitudinal cross-section of a metal sliding member according to the present invention;
fig. 2-5 show grooves of different embodiments of a metal sliding member according to the present invention, showing grooves having different cross-sectional shapes;
fig. 6 shows cross-hatched grooves of a metal sliding member according to the present invention, wherein the criss-cross grooves communicate with each other;
fig. 7 is a graph of experimental data of a metallic sliding member according to a preferred embodiment of the present invention and a comparative example.
Detailed Description
The inventive concept of the present invention will be described in detail below with reference to the accompanying drawings. What has been described herein is merely a preferred embodiment in accordance with the present invention, and those skilled in the art will appreciate that other ways of implementing the present invention on the basis of the preferred embodiment will also fall within the scope of the present invention. In the following detailed description, directional terms, such as "upper", "lower", and the like, are used with reference to the orientation depicted in the accompanying drawings. The components of embodiments of the present invention can be positioned in a number of different orientations and the directional terminology is used for purposes of illustration and is in no way limiting.
For convenience of description, the sliding bearing is taken as an example, it should be understood that the metal sliding member may be other types of coupling members, and the metal sliding member of the present invention is not only shown as a sliding bearing.
Fig. 1 is a partially schematic sectional view showing a metal sliding member according to the present invention. When used as a plain bearing, the plain bearing should have a circular or substantially circular cross-section. The direction of the section of fig. 1 is perpendicular to the direction of the section of the cross section. Fig. 1 shows only the lower half of the sliding bearing, and it is to be understood that the upper half of the sliding bearing 100, not shown, is in an up-down symmetrical relationship with the lower half shown in fig. 1.
Wherein the upper surface 101 shown in fig. 1, i.e. the first surface layer 101, is the working surface. In the use state, there is a shaft (not shown) as a power transmission mechanism on the first surface layer 101 (inside the sliding bearing 100) of fig. 1. During operation of the system, the shaft may apply a heavy load to the plain bearing 100.
Fig. 2-6 show the shape of the grooves, cross-hatched grooves according to different embodiments of the invention in the direction of the viewing angle from the first surface layer 101 towards the metal base layer 103. Although not further shown, it is understood that it is within the intended scope of the present invention to select differently configured grooves and/or cross-hatched grooves shown in fig. 2-6 and to arrange them in combination on the same sliding bearing 100.
The sliding bearing 100 may be prepared by the following steps:
subjecting the surface of the metal base layer 103 to carburizing treatment, nitriding treatment, sulfurizing treatment, phosphating treatment or fluorination treatment to form a second surface layer 102;
the surface of the second surface layer 102 is subjected to a deposition process or a spray process to form the first surface layer 101.
The metal base layer 103 is in fact a cylindrical structure having an inner and outer diameter, which can be formed typically by conventional lathe semi-finishing. The grooves 1A, 1B, 1C, 1D and the textured grooves 1E can be obtained by a milling machine or the like which is a conventional processing method in the art. It is understood that after the second surface layer 102 and the first surface layer 101 are formed, the grooves 1A, 1B, 1C, 1D and the textured grooves 1E are not completely filled, and retain their function of storing the lubricating medium.
Different from the prior art, the porosity of the second surface layer 102 of the present invention is far lower than that of the porous metal material layer, and the hardness of the second surface layer is higher than that of the porous metal material layer, by sintering various metal alloys to form the porous metal material layer with higher porosity on the metal base layer 103. Thus, in the extreme case where first surface layer 101 is worn out, even if second surface layer 102 is exposed, sliding bearing 100 can maintain good low-friction, heavy-load-resistant characteristics for a long period of time. Obviously, the porous metal material layer does not have this function.
According to the sliding bearing 100 of the present invention, at least one element is present between the first surface layer 101 and the second surface layer 102, so that the element between the interface of the first surface layer 101 and the second surface layer 102 is easily diffused, and a good metallurgical bonding property can be formed between the two.
Preferably, the same element may be selected from one or more of sulfur, carbon, nitrogen and fluorine. For example, when the second surface layer 102 is subjected to the sulfurization treatment to contain an FeS layer, the first surface layer 101 is preferably set to contain MoS2、MnS2、WS2Or polyphenylene sulfide. When the second surface layer 102 is nitrided to have a nitride by nitriding treatment, the first surface layer 101 is preferably set to contain any one or more of TiN, CrN, TiAlN, polyimide, or polyamide. When the second surface layer 102 is carburized to have carbide, the first surface layer 101 is preferably an amorphous carbon-deposited layer. When the second surface layer 102 is subjected to the fluorination treatment to contain iron fluoride, the first surface layer 101 is preferably set to contain any one or more of polytetrafluoroethylene, polyvinylidene fluoride, ethylene-tetrafluoroethylene copolymer, fluorinated ethylene-propylene copolymer, tetrafluoroethylene-perfluoroalkylvinylether copolymer.
The performance of the sliding bearing 100 according to the invention is explained below in connection with specific embodiments and corresponding experimental data.
Examples
Examples 1-4 and corresponding comparative examples 1-7 having a first surface layer 101, a second surface layer 102 and a metal base layer 103 according to the present invention were prepared as follows. Wherein the content of the first and second substances,
the preparation and test data for examples 1 to 4 and corresponding comparative examples 1 to 7 are given in table 1 below:
TABLE 1
All the test data in the table are tested by adopting a swing rack simulating actual working conditions. The metal substrate layer 103 is made of 45# steel with the hardness of HRC 57; the test surface pressure is 50N/mm2(ii) a The swinging angle is +/-45 ℃, and the frequency is 0.25 Hz; initial grease lubrication; the test termination condition is that the friction coefficient is more than or equal to 0.3 or the sliding bearing 100 is locked with the shaft or passes the test time of 100 h.
Example 1
In example 1, first, the sliding bearing 100 of 45# steel, in which the circular oil reservoir hole 1A shown in fig. 2 had been machined, was subjected to low-temperature gas sulfurization. Wherein the sulfurization temperature is controlled at 200 ℃ for 1h, thereby forming the FeS-rich second surface layer 102 on the surface of the sliding bearing 100 (metal base layer 103). The sliding bearing 100 is then finished to the required dimensional and surface accuracy. Then, MoS is deposited by spraying2Thereby forming a first surface layer 101 having a thickness of 2-5 μm on the second surface layer 102 of the sliding bearing 100.
Comparative example 1
In comparison with example 1 described above, in comparative example 1, the surface of the 45# steel sliding bearing 100 in which the circular oil reservoir hole 1A and dimensional accuracy requirements have been machined is not further treated, that is, the sliding bearing 100 of comparative example 1 does not include the first surface layer 101 and the second surface layer 102.
Comparative example 2
Comparative example 2 a 45# steel bearing, which had been machined with a circular oil reservoir 1A and met dimensional accuracy requirements, was subjected to low temperature gas sulfurization to form a FeS-rich second surface layer 102. Wherein the sulfurizing temperature is controlled at 200 ℃ and the time is 1 h. In contrast to example 1 described above, the sliding bearing 100 of this comparative example 2 does not contain the first surface layer 101.
Comparative example 3
Comparative example 3A No. 45 steel bearing having circular oil storage hole 1A formed therein was machined to a required dimensional accuracy, and MoS was deposited on the surface thereof by spray coating2Whereby only the first surface layer 101 having a thickness of 2 to 5 μm is formed on the surface of the sliding bearing 100 (metal base layer 103). With the above embodimentIn contrast to example 1, the plain bearing 100 of this comparative example 2 does not contain the second surface layer 102.
The results of the swing test described above are shown in table 1 and fig. 7. According to table 1 and fig. 7, comparative example 1 is such that the friction coefficient between the sliding bearing 100 and the shaft rapidly exceeds 0.3 under this gravity load condition, thereby stopping the test; in comparative example 2 and comparative example 3, the friction coefficient exceeded 0.3 at different times, respectively, and the test was stopped; however, example 1 had a coefficient of friction of only about 0.1 throughout the test, successfully completing the 100h test. In the case of only second surface layer 102, the time for which sliding bearing 100 maintains normal operation is longer, while in the case of only first surface layer 101, the time for which sliding bearing 100 maintains normal operation is shorter.
Example 2
In example 2, first, a 20CrMo steel bearing in which an oval oil reservoir hole 1B as shown in fig. 3 has been machined in the working surface is subjected to low temperature gas carburization to form a second surface layer 102. Wherein the carburizing temperature is controlled at 500 ℃ for 30 minutes; and the hardness of the second surface layer 102 is increased to 800HV or more. The sliding bearing 100 is then finished to the required dimensional and surface accuracy. A diamond like film (DLC) deposition layer was then deposited using PACVD to form the first surface layer 101. Wherein the process temperature for forming the first surface layer 101 is controlled at 150 deg.c, the thickness of the first surface layer 101 formed on the second surface layer 102 is 2-5 μm, which is a diamond like film (DLC).
Comparative example 4
This comparative example 4 does not have the first surface layer 101, as compared to the above example 2. Second surface layer 102 is formed in the same manner as in example 2, and second surface layer 102 is also subjected to finish machining to achieve the required dimensional accuracy and surface accuracy.
Comparative example 5
The same as example 2 except that the thickness of the first surface layer 101 was about 30 μm, compared to example 2 above.
Using the swing test described above, the results are shown in table 1, where it can be seen that: comparative example 4 was started initially and stopped with a coefficient of friction quickly exceeding 0.3; in comparative example 5, after 45 hours, the bearing and the shaft are locked due to overlarge torque, and further analysis shows that the deposited layer (the first surface layer 101) in the friction area can quickly fall off completely under the condition that the thickness of the deposited layer (the first surface layer 101) is large, and the friction coefficient of the carburized layer is too large; example 2 successfully completed the 100h test.
Example 3
In example 3, first, a 50# steel bearing having a pentagonal oil reservoir hole formed in the surface thereof as shown in fig. 4 was gas nitrided. Wherein the nitriding temperature is controlled at 550 ℃ and the hardness of the formed nitrided layer is ensured to be increased to more than 750HV to form the second surface layer 102. The sliding bearing 100 is then finished to the required dimensional and surface accuracy. Then, a TiCN deposition layer (first surface layer 101) was prepared by a CVD (vapor deposition) method. Wherein the process temperature adopted in the CVD method is 550 ℃, reaction gas is introduced, the pressure in the furnace is 900-1200MPa, the heat preservation time is 2h, and the thickness of the TiCN deposition layer deposited on the second surface layer 102 is 2-5 μm.
Comparative example 6
This comparative example 6 first gas-nitrided the 50# steel bearing having the pentagonal oil reservoir hole formed in the surface thereof to form the second surface layer 102. Wherein the nitriding temperature is controlled at 550 ℃, and the surface hardness is improved to more than 750 HV. The second surface layer 102 of the slide bearing is then finished to the required dimensional and surface accuracy. In contrast to example 3, this comparative example 6 does not have the first surface layer 101.
Comparative example 7
The method is the same as that of embodiment 3 except that the surface of the sliding bearing 100 is not finished, as compared with embodiment 3. The surface roughness of the plain bearing 100, in which no finishing is made, is ra 6.4.
Using the swing test described above, the results are shown in table 1, where it can be seen that: comparative example 6 was started initially and stopped with a coefficient of friction quickly exceeding 0.3; comparative example 7 was tested for only 19 h; example 3 successfully completed the 100h test.
Example 4
In example 4, a 35CrMo steel bearing (metal base layer 103) having a textured groove as shown in fig. 6 formed on the surface thereof was first subjected to a fluoroferrite conversion to form a conversion coating (second surface layer 102). Wherein the pH value of the fluoferrite solution is 2, the conversion treatment time is 2h, and the adopted temperature is room temperature. The bearing is then finished to the required dimensional and surface accuracy. Then a polytetrafluoroethylene coating is prepared by a spray coating method to the required thickness of 2-5 μm, and is sent to a high temperature furnace at 400 ℃ and is kept warm for 4h to form the first surface layer 101.
Example 4 successfully completed the 100h test using the swing test described above.
The present invention can be clearly seen from the description and examples of the present invention, compared to the prior art, the metal sliding member of the present invention has the following characteristics: low coefficient of friction; high seizure resistance; the first surface layer and the second surface layer have good interface combination, and the first surface layer is not easy to fall off; after the initial lubrication, the interval between grease additions may be extended.
The scope of protection of the present invention is limited only by the claims. Persons of ordinary skill in the art, having benefit of the teachings of the present invention, will readily appreciate that alternative structures to those disclosed as possible may be substituted for the alternative embodiments disclosed, and that the disclosed embodiments may be combined to create new embodiments, which likewise fall within the scope of the appended claims.
Claims (14)
1. A metallic sliding member comprising a metallic base layer and a first surface layer located above the metallic base layer, wherein the first surface layer is configured as a working surface of the metallic sliding member,
the metallic sliding member further comprises a second surface layer located between the first surface layer and the metallic base layer,
wherein the first surface layer is made of a material having a low coefficient of friction or/and a high wear resistance.
2. The metal slide member according to claim 1, wherein the second surface layer is made of a material having a low friction coefficient and being resistant to seizure.
3. The metal slide of claim 1 further comprising a textured groove or a plurality of grooves for storing a lubricating medium, wherein the grooves extend from the first surface layer to the metal base layer and wherein the plurality of grooves are independent of or in communication with each other.
4. The metal sliding member according to claim 3, wherein the thickness D1 of the first surface layer satisfies the condition: d1 is more than or equal to 1 mu m and less than or equal to 20 mu m.
5. The metal sliding member according to claim 4, wherein the thickness D1 of the first surface layer satisfies the condition: d1 is more than or equal to 2 mu m and less than or equal to 5 mu m.
6. The metal sliding member according to claim 4, wherein the second surface layer is a surface layer formed by subjecting a metal base layer to a carburizing treatment, a nitriding treatment, a sulfurizing treatment, a phosphating treatment, or a fluorination treatment.
7. The metal slide member according to claim 6, wherein the second surface layer comprises a permeation layer that permeates the metal base layer and a compound layer on top of the permeation layer.
8. The metallic sliding member according to claim 7 wherein the thickness D2 of the permeable layer satisfies the condition: d2 is more than or equal to 20 mu m.
9. The metal slide member according to claim 8, wherein the thickness D3 of the compound layer satisfies the condition: d3 is more than or equal to 1 μm.
10. The metal sliding member according to claim 8 or 9, wherein a roughness Ra of a surface of the second surface layer facing the first surface layer satisfies a condition: ra is less than or equal to 3.2 mu m.
11. The metal sliding member according to claim 10, wherein a roughness Ra of a surface of the second surface layer facing the first surface layer satisfies a condition: ra is less than or equal to 0.8 mu m.
12. The metal slide member according to claim 1, wherein the hardness of the second surface layer is not less than HRC45 and not more than HRC 55.
13. The metal slide member according to claim 12, wherein the hardness of the second surface layer is not less than HRC48 and not more than HRC 52.
14. The metal slide of claim 3 wherein the cross-section of the groove is circular, elliptical or polygonal.
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| CN201921122995.3U CN210919827U (en) | 2019-07-17 | 2019-07-17 | Metal sliding component |
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| CN201921122995.3U CN210919827U (en) | 2019-07-17 | 2019-07-17 | Metal sliding component |
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| CN201921122995.3U Active CN210919827U (en) | 2019-07-17 | 2019-07-17 | Metal sliding component |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296149A (en) * | 2019-07-17 | 2019-10-01 | 浙江中达精密部件股份有限公司 | A kind of metal slide component and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110296149A (en) * | 2019-07-17 | 2019-10-01 | 浙江中达精密部件股份有限公司 | A kind of metal slide component and preparation method thereof |
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