Solid-liquid composite self-lubricating bearing with supporting frame and preparation method of solid-liquid composite self-lubricating bearing

Abstract

The invention relates to a solid-liquid composite self-lubricating bearing with a supporting framework and a preparation method thereof.The solid-liquid composite self-lubricating bearing comprises an inner-layer supporting framework, an outer-side supporting layer, a porous-structure oil storage layer and an inner-side structural layer, the outer-side supporting layer is arranged on the outer side of the porous-structure layer in a sleeving mode, and the inner-layer supporting framework and the inner-side structural layer are arranged on the inner side of the porous-structure layer in a sleeving mode; a solid lubricant is arranged on the inner-layer supporting frame, and the inner-side structural layer is a porous structural layer. The solid embedded self-lubricating bearing has the characteristics of oil storage and self-circulation lubrication of the oil-retaining bearing, and also has the characteristics of high bearing capacity, impact resistance and the like of the solid embedded self-lubricating bearing.

Description

Technical Field

[0001] The invention relates to the technical field of self-lubricating bearings, in particular to a solid-liquid composite self-lubricating bearing with a supporting frame and a preparation method thereof. Background Art

[0002] Oil-containing bearings are made of metal powder and other anti-friction materials through pressing, sintering, shaping and oil immersion. They can use their own porous structure to store lubricating oil and realize oil storage and self-circulating lubrication. However, due to the porosity of the material, its bearing strength is far inferior to that of bearings made of molten metal materials, and when the load is large, the structure is prone to fall off and damage.

[0003] Solid inlaid self-lubricating bearings are a novel self-lubricating bearing that combines the advantages of metal bearings and oil-free lubricating bearings. The metal matrix bears the load, and the solid lubricating material provides lubrication. It has the characteristics of strong load-bearing capacity, impact resistance, and self-lubrication. However, in the early stage of operation, solid lubricants cannot lubricate well, and early wear and tear often occur due to insufficient lubrication, which greatly reduces the service life of the bearing. Summary of the invention

[0004] The purpose of the present invention is to provide a solid-liquid composite self-lubricating bearing with a support frame and a preparation method thereof, which can have the characteristics of oil-containing bearings with oil storage and self-circulating lubrication while also having the characteristics of solid inlaid self-lubricating bearings with strong load-bearing capacity and impact resistance.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a solid-liquid composite self-lubricating bearing with a support frame, comprising an inner support frame, an outer support layer, a porous structure oil storage layer, and an inner structural layer, the outer side of the porous structure layer is sleeved with the outer support layer, the inner side of the porous structure is sleeved with the inner support frame and the inner structural layer, the inner support frame is provided with a solid lubricant, and the inner structural layer is a porous structure layer.

[0006] Furthermore, the inner support frame includes an upper fixing ring and a lower fixing ring, a plurality of support plates are arranged between the upper fixing ring and the lower fixing ring, the support plates divide the space between the upper fixing ring and the lower fixing ring into a plurality of equally divided openings, a plurality of through holes are opened on the support plates, solid lubricants are arranged in the through holes, and the number of the inner structural layers is the same as the number of the openings, and can be embedded in the openings.

[0007] Furthermore, the material of the oil reservoir is polytetrafluoroethylene and chemical filler.

[0008] Furthermore, the material of the inner structural layer is polytetrafluoroethylene, molybdenum disulfide and bronze powder.

[0009] Furthermore, the material of the inner support frame and the outer support layer is titanium bronze.

[0010] A method for preparing a solid-liquid composite self-lubricating bearing with a support frame, the preparation method comprising the following steps: Step S1, turning and cutting a titanium bronze round tube to obtain an inner supporting frame structure and an outer supporting layer structure; Step S2, copper powder, tin powder and graphite powder are mixed in a certain proportion, the inner support frame structure is placed in the mold after being positioned, the mixed bronze powder is filled in, a press is used to press, and the compacted inner ring is placed in a high-temperature furnace for sintering to obtain an inner ring structure blank; after the sintered inner ring is cooled to room temperature, the excess material after sintering is removed from the inner ring and the outer support layer to make the bearing close to the final size; Step S3, drilling holes on the inner ring according to the position of the solid lubricant, then subjecting the inner ring and the outer supporting layer to heat treatment and high-temperature nitriding, and using a grinder to perform rough grinding and fine grinding on the inner ring and the outer supporting layer to achieve the required product size and surface finish; Step S4, mixing polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide baked in a high-temperature oven in a certain proportion and introducing the mixture into an injection molding machine, obtaining the required oil reservoir structure by mold injection, and removing defective products by manual screening; Step S5, assembling the obtained inner ring and outer supporting layer with the obtained oil reservoir structure, cleaning, drying, and then placing them in a vacuum oil immersion device, drawing a vacuum and maintaining it for 40 minutes, slowly releasing the vacuum until the pressure in the tank is balanced, taking out the parts, drying them, and checking whether the appearance is damaged; Step S6: embedding graphite into the holes described in step 4 by mechanically extruding the undamaged parts to obtain a solid-liquid composite self-lubricating bearing with a support frame.

[0011] Furthermore, in step S2, the sintering temperature is 860° C., and the sintering time is 1.5 h.

[0012] Furthermore, the copper powder, tin powder and graphite powder are mixed in a ratio of: 88 wt % of copper powder, 11.5 wt % of tin powder and 0.5 wt % of graphite powder are mixed.

[0013] Furthermore, the polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide are further mixed by mixing 85 wt % of polytetrafluoroethylene, 10 wt % of molybdenum disulfide and 5 wt % of azodicarbonamide.

[0014] The beneficial effects of the present invention are as follows: it combines the processing methods of traditional oil-containing bearings and solid-embedded self-lubricating bearings, and uses common titanium bronze materials as support frame materials. It not only has the advantages of good friction, low material cost, strong structure and high hardness, but also effectively reduces the occurrence of cracking and other phenomena of oil-containing bearings due to longitudinal loads as support frame materials. The solid lubricant embedded in the inner ring can effectively reduce friction vibration during the start and stop stages of the shaft due to the shock absorption performance of the graphite solid during the movement of the bearing, thereby ensuring the stable operation of the shaft. The designed oil reservoir and the embedded solid lubricant enable the bearing to rely on its own lubrication mechanism to effectively provide a solid-liquid composite lubricating oil film during oil-free operation, further reducing the friction coefficient and increasing the service life of the bearing to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the bearing of the present invention; Figure 2 An exploded view of the bearing of the present invention; Figure 3 The figure is a process flow chart of the preparation of the bearing of the present invention.

[0016] Among them: 1. outer supporting layer, 2. porous structure oil storage layer, 3. inner supporting frame, 31. upper fixing ring, 32. lower fixing ring, 33. supporting plate, 34. through port, 4. solid lubricant, 5. inner structural layer. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] See also Figures 1 to 3 The present invention provides an embodiment: a solid-liquid composite self-lubricating bearing with a support frame, comprising an inner support frame 3, an outer support layer 1, a porous structure oil storage layer 2, and an inner structure layer 5, wherein the outer side of the porous structure layer is sleeved with the outer support layer 1, and the inner side of the porous structure is sleeved with the inner support frame 3 and the inner structure layer 5, and the inner support frame 3 is provided with a solid lubricant 4, and the inner structure layer 5 is a porous structure layer. The inner support frame and the outer support layer 1 are used to bear the load, and the inner support frame and the inner structure layer 5 are combined into an inner ring. The graphite solid lubricant 4 is embedded in the inner support frame, and after the structure layer is embedded, it is positioned and punched for embedding. During use, the liquid is precipitated from the porous oil storage layer, flows out through the pore structure of the inner porous structure layer, and forms a solid-liquid composite lubricating oil film with the solid lubricant 4 to provide lubrication.

[0019] Please continue reading Figure 2As shown, in one embodiment of the present invention, the inner layer support frame 3 includes an upper fixing ring 31 and a lower fixing ring 32, and a plurality of support plates 33 are arranged between the upper fixing ring 31 and the lower fixing ring 32, and the support plates 33 divide the space between the upper fixing ring 31 and the lower fixing ring 32 into a plurality of equally divided through openings 34, and a plurality of through holes are opened on the support plates 33, and solid lubricants 4 are arranged in the through holes, and the number of the inner structural layers 5 is the same as the number of the through openings 34, and can be embedded in the through openings 34.

[0020] Please continue reading Figures 1 to 3 As shown, in one embodiment of the present invention, the material of the oil reservoir is polytetrafluoroethylene and chemical filler. The oil reservoir is directly formed by injection molding using polytetrafluoroethylene material and chemical filler.

[0021] Please continue to refer to 1 to Figure 3 As shown, in one embodiment of the present invention, the material of the inner structural layer 5 is polytetrafluoroethylene, molybdenum disulfide and bronze powder. The inner structural layer 5 is obtained by mixing polytetrafluoroethylene, molybdenum disulfide and bronze powder and then pressing, sintering and shaping them on a support frame.

[0022] Please continue reading Figures 1 to 3 As shown, in one embodiment of the present invention, the material of the inner support frame and the outer support layer 1 is titanium bronze. The inner support frame and the outer support layer 1 are mainly made of titanium bronze material, which has the characteristics of easy processing, high strength, good friction performance, etc.

[0023] See also Figures 1 to 3 The present invention provides an embodiment: a method for preparing a solid-liquid composite self-lubricating bearing with a support frame, the preparation method comprising the following steps: Step S1, using titanium bronze round tube turning and cutting to obtain the inner support frame structure and the outer support layer 1 structure; specifically, using CAD drawing software to design the inner support frame and the outer support layer 1 structure data model, using titanium bronze round tube turning to obtain columnar raw materials, using laser cutting to obtain the rough accessories of the support frame structure, or using electric spark wire cutting after punching to obtain the rough accessories of the support frame structure, and grinding the edges and corners of the rough accessories to remove burrs to obtain Figure 1 The inner support frame structure and the outer support layer 1 structure shown in ; Step S2, copper powder, tin powder and graphite powder are mixed in a certain proportion, the inner support frame structure is placed in the mold after being positioned, the mixed bronze powder is filled in, a press is used to press, and the compacted inner ring is placed in a high-temperature furnace for sintering to obtain an inner ring structure blank; after the sintered inner ring is cooled to room temperature, the excess material after sintering is removed from the inner ring and the outer support layer 1 to make the bearing close to the final size; Step S3, according to the position of the solid lubricant 4, the inner ring is punched, and then the inner ring and the outer supporting layer 1 are heat treated and subjected to high-temperature nitriding treatment, and the inner ring and the outer supporting layer 1 are coarsely ground and finely ground by a grinder to achieve the required product size and surface finish; Step S4, mixing polytetrafluoroethylene, molybdenum disulfide and azodicarbonyl after being baked in a high-temperature oven in a certain proportion and introducing the mixture into an injection molding machine, obtaining the required oil reservoir structure by mold injection, and removing defective products by manual screening; Step S5, assembling the inner ring and the outer supporting layer 1 obtained with the obtained oil reservoir structure, cleaning, drying, and then placing them in a vacuum oil immersion device, drawing a vacuum and maintaining it for 40 minutes, slowly releasing the vacuum until the pressure in the tank is balanced, taking out the parts, drying them, and checking whether the appearance is damaged; Step S6: embedding graphite into the holes described in step 4 by mechanically extruding the undamaged parts to obtain a solid-liquid composite self-lubricating bearing with a support frame.

[0024] Please continue reading Figures 1 to 3 As shown, in one embodiment of the present invention, the sintering temperature in step S2 is 860° C., and the sintering time is 1.5 h.

[0025] Please continue reading Figures 1 to 3 As shown, in one embodiment of the present invention, the mixing ratio of copper powder, tin powder and graphite powder is further as follows: 88wt% of copper powder, 11.5wt% of tin powder and 0.5wt% of graphite powder are mixed.

[0026] Please continue reading Figures 1 to 3 As shown, in one embodiment of the present invention, the polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide are further mixed by mixing 85wt% of polytetrafluoroethylene, 10wt% of molybdenum disulfide and 5wt% of azodicarbonamide.

[0027] The present invention has the following working principle: the present invention uses an inner support frame and an outer support layer to bear the load, and a porous structure oil storage layer to store oil for self-circulating lubrication, so that it not only has the characteristics of oil storage and self-circulating lubrication of oil-containing bearings, but also has the characteristics of strong load-bearing capacity and impact resistance of solid inlaid self-lubricating bearings, taking into account the advantages of oil-containing bearings and solid inlaid self-lubricating bearings, taking advantage of each other and making up for each other's shortcomings, thereby greatly improving the performance and service life of the self-lubricating bearings.

[0028] The above description is only a preferred embodiment of the present invention and should not be construed as limiting the present application. All equivalent changes and modifications made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A solid-liquid composite self-lubricating bearing with a support frame, characterized in that: It includes an inner support frame, an outer support layer, a porous structure oil storage layer, and an inner structural layer. The outer side of the porous structure layer is covered with the outer support layer, and the inner side of the porous structure is covered with the inner support frame and the inner structural layer. Solid lubricant is arranged on the inner support frame, and the inner structural layer is a porous structure layer.

2. The solid-liquid composite self-lubricating bearing with a support frame according to claim 1, characterized in that: The inner support frame includes an upper fixed ring and a lower fixed ring, a plurality of support plates are arranged between the upper fixed ring and the lower fixed ring, the support plates divide the space between the upper fixed ring and the lower fixed ring into a plurality of equally divided openings, a plurality of through holes are opened on the support plates, solid lubricants are arranged in the through holes, the number of the inner structural layers is the same as the number of the openings, and can be embedded in the openings.

3. The solid-liquid composite self-lubricating bearing with a support frame according to claim 1, characterized in that: The materials of the oil reservoir are polytetrafluoroethylene and chemical fillers.

4. The solid-liquid composite self-lubricating bearing with a support frame according to claim 1, characterized in that: The materials of the inner structural layer are polytetrafluoroethylene, molybdenum disulfide and bronze powder.

5. The solid-liquid composite self-lubricating bearing with a support frame according to claim 1, characterized in that: The material of the inner supporting frame and the outer supporting layer is titanium bronze.

6. A method for preparing the solid-liquid composite self-lubricating bearing with a support frame as described in claim 1, characterized in that: The preparation method comprises the following steps: Step S1, turning and cutting a titanium bronze round tube to obtain an inner supporting frame structure and an outer supporting layer structure; Step S2: Mix copper powder, tin powder and graphite powder in a certain proportion, put the inner support frame structure into the mold after determining its position, and fill the mixed bronze powder into it. Use a press to press, put the compacted inner ring into a high-temperature furnace for sintering, and obtain the inner ring structure blank; after the sintered inner ring is cooled to room temperature, remove the excess material of the inner ring and the outer support layer after sintering to make the bearing close to the final size; Step S3, drilling holes on the inner ring according to the position of the solid lubricant, then subjecting the inner ring and the outer supporting layer to heat treatment and high-temperature nitriding, and using a grinder to perform rough grinding and fine grinding on the inner ring and the outer supporting layer to achieve the required product size and surface finish; Step S4, mixing polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide baked in a high-temperature oven in a certain proportion and introducing the mixture into an injection molding machine, obtaining the required oil reservoir structure by mold injection, and removing defective products by manual screening; Step S5, assembling the obtained inner ring and outer supporting layer with the obtained oil reservoir structure, cleaning, drying, and then placing them in a vacuum oil immersion device, drawing a vacuum and maintaining it for 40 minutes, slowly releasing the vacuum until the pressure in the tank is balanced, taking out the parts, drying them, and checking whether the appearance is damaged; Step S6: embedding graphite into the holes described in step 4 by mechanically extruding the undamaged parts to obtain a solid-liquid composite self-lubricating bearing with a support frame.

7. The method for preparing a solid-liquid composite self-lubricating bearing with a support frame according to claim 6, characterized in that: The sintering temperature in step S2 is 860° C. and the sintering time is 1.5 h.

8. The method for preparing a solid-liquid composite self-lubricating bearing with a support frame according to claim 6, characterized in that: The mixing ratio of the copper powder, tin powder and graphite powder is further as follows: 88 wt % of copper powder, 11.5 wt % of tin powder and 0.5 wt % of graphite powder are mixed.

9. The method for preparing a solid-liquid composite self-lubricating bearing with a support frame according to claim 6, characterized in that: The polytetrafluoroethylene, molybdenum disulfide and azodicarbonamide are further mixed by mixing 85 wt % of polytetrafluoroethylene, 10 wt % of molybdenum disulfide and 5 wt % of azodicarbonamide.

Images