CN111927875B - Machining method of corrosion-resistant water pump thrust bearing with composite bearing bush - Google Patents
Machining method of corrosion-resistant water pump thrust bearing with composite bearing bush Download PDFInfo
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- CN111927875B CN111927875B CN202010829178.2A CN202010829178A CN111927875B CN 111927875 B CN111927875 B CN 111927875B CN 202010829178 A CN202010829178 A CN 202010829178A CN 111927875 B CN111927875 B CN 111927875B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
- F16C17/08—Sliding-contact bearings for exclusively rotary movement for axial load only for supporting the end face of a shaft or other member, e.g. footstep bearings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/003—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass bearings
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/026—Selection of particular materials especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/06—Lubrication
- F04D29/061—Lubrication especially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/203—Multilayer structures, e.g. sleeves comprising a plastic lining
- F16C33/206—Multilayer structures, e.g. sleeves comprising a plastic lining with three layers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/20—Sliding surface consisting mainly of plastics
- F16C33/208—Methods of manufacture, e.g. shaping, applying coatings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/02—Rigid support of bearing units; Housings, e.g. caps, covers in the case of sliding-contact bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/10—Alloys based on copper
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2204/00—Metallic materials; Alloys
- F16C2204/60—Ferrous alloys, e.g. steel alloys
- F16C2204/70—Ferrous alloys, e.g. steel alloys with chromium as the next major constituent
- F16C2204/72—Ferrous alloys, e.g. steel alloys with chromium as the next major constituent with nickel as further constituent, e.g. stainless steel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2208/00—Plastics; Synthetic resins, e.g. rubbers
- F16C2208/20—Thermoplastic resins
- F16C2208/30—Fluoropolymers
- F16C2208/32—Polytetrafluorethylene [PTFE]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/40—Shaping by deformation without removing material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/60—Shaping by removing material, e.g. machining
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2220/00—Shaping
- F16C2220/60—Shaping by removing material, e.g. machining
- F16C2220/62—Shaping by removing material, e.g. machining by turning, boring, drilling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/02—Mechanical treatment, e.g. finishing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/10—Hardening, e.g. carburizing, carbo-nitriding
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/44—Centrifugal pumps
Abstract
The invention discloses a processing method of a corrosion-resistant water pump thrust bearing of a composite bearing bush, wherein the thrust bearing comprises a thrust disc, the composite bearing bush, a bearing bush substrate and a bearing base, a through hole is formed in the middle of the thrust disc, a key groove is formed in the side face of the through hole, an axial limiting groove is formed in the axial position of the through hole, the thrust disc is installed above the composite bearing bush, the composite bearing bush is sintered above the bearing bush substrate in a hot-pressing mode, a bearing bush substrate installation hole and an oil groove are formed in the bearing bush substrate, the bearing bush substrate is installed on the bearing base through the bearing bush substrate installation hole, the bearing base is located below the bearing bush substrate, and the composite bearing bush is formed by hot-pressing and sintering of a modified PTFE layer, a phosphor bronze spiral wire layer and a copper powder layer. The invention improves the wear resistance, the bearing performance, the self-lubricating performance, the good bearing performance and the corrosion resistance by adopting the polytetrafluoroethylene and stainless steel materials, and is particularly suitable for the water pump bearing which works in the environment with higher humidity for a long time.
Description
Technical Field
The invention belongs to the technical field of water pump sliding push bearings, and particularly relates to a machining method of a corrosion-resistant water pump thrust bearing with a composite bearing bush.
Background
The power station water pump needs to work in an environment with high air humidity for a long time, some water pumps such as a submersible pump and the like even need to work in an aqueous medium, and the corrosion of the bearing is easily caused by the immersion of other corrosive substances such as water and the like and the poor rust prevention and the like, so that the service life of the bearing is influenced; when the thrust bearing of the water pump unit bears axial thrust, the phenomenon of bush burning caused by friction loss and friction heat accumulation frequently occurs on the surface of a traditional bearing bush, and even the phenomenon of forced halt of the unit occurs in severe cases. The working condition of the water pump unit bearing bush is always the key inspection object of the power station, and once the bearing bush does not meet the working condition requirement or has problems, the power station needs to replace the bearing bush body, so that the normal operation of the unit is met. The traditional bearing bush has poor reliability and large friction loss, easily causes a series of friction and wear problems, causes the service life of the bearing to be difficult to predict and becomes a hidden engineering trouble, seriously influences the production benefit, and puts forward higher requirements on the lubricating performance of the bearing.
Disclosure of Invention
The invention provides a processing method of a corrosion-resistant water pump thrust bearing with a composite bearing bush, which improves the wear resistance, the bearing performance, the self-lubricating performance, the good bearing performance and the corrosion resistance by adopting polytetrafluoroethylene and stainless steel materials, and is particularly suitable for a water pump bearing which works in a high-humidity environment for a long time.
The technical scheme of the invention is realized as follows:
a processing method of a corrosion-resistant water pump thrust bearing of a composite bearing bush is characterized in that a through hole is formed in the middle of the thrust disc, a key groove is formed in the side face of the through hole, an axial limiting groove is formed in the axial position of the through hole, the thrust disc is installed above the composite bearing bush, the composite bearing bush is sintered above the bearing bush base in a hot-pressing mode, a bearing bush base installation hole and an oil groove are formed in the bearing bush base, the bearing bush base is installed on the bearing base through the bearing bush base installation hole, the bearing base is located below the bearing bush base, and the composite bearing bush is formed by hot-pressing and sintering of a modified PTFE layer, a phosphor bronze spiral wire layer and a copper powder layer;
the invention discloses a processing method of a corrosion-resistant water pump thrust bearing of a composite bearing bush, which comprises the following specific steps:
1) machining a thrust disc: cutting a stainless steel bar material with the diameter of 280mm and the thickness of 35mm as a blank, removing the outer skin of the stainless steel bar material by using a lathe, performing finish machining to form a stainless steel disc with the diameter of 264mm and the thickness of 30mm, boring an inner hole with the diameter of 101mm in the center of the top of the disc, punching, turning an inner circle with the diameter of 121mm and the depth of 8mm from the top of the disc on the basis of the inner hole to form an axial limiting groove, cutting a key position groove with the width of 20mm and the depth of 6mm on the inner hole by using an slotting machine, wherein the machining tolerance is 0.02mm, chamfering a roof circle to 0.5 multiplied by 45 degrees, and performing heat treatment;
2) processing a composite layer of the composite bearing bush and the bearing bush substrate: grinding a polytetrafluoroethylene material into particles with the particle size of below 10um by using a ball mill, mixing nano ceramic powder and PTFE particles by using a hot pressing method, and performing hot melting and finish machining to obtain a modified PTFE plate material, namely a modified PTFE layer;
2.1) clockwise winding the phosphor bronze metal wire on a black bar with the diameter of 2mm to form a spiral shape, and forming a phosphor bronze spiral wire layer after heat treatment;
2.2) cutting a stainless steel plate in a linear mode, forming a bearing bush substrate layer after finish machining, and carrying out heat treatment;
2.3) sintering copper powder on a stainless steel bearing bush substrate by using a hot-pressing sintering furnace to form a complex of a copper powder layer and the bearing bush substrate, sintering a phosphor bronze spiral wire layer on a copper powder-stainless steel substrate composite layer, sintering a modified PTFE layer on the phosphor bronze spiral wire-copper powder-stainless steel substrate complex, and rolling to form a thin-wall composite bearing bush and bearing bush substrate composite layer sample;
2.4) linearly cutting the composite bearing bush and the bearing bush substrate composite layer to form a circular plate, chamfering a fillet of 0.5 multiplied by 45 degrees at the outer circle edge of the plate, processing prismatic reticular microtexture on the surface of the modified PTFE layer by adopting a femtosecond laser technology, wherein each texture is 0.5mm deep and 50um wide, the prismatic reticular microtexture is formed by mutually staggering prismatic edges forming an included angle of 40 degrees, and during processing, a vertical edge is processed tangentially from the outer circle edge of the composite bearing bush and the bearing bush substrate composite layer until the vertical edge is processed to the other end, then the composite layer is rotated 40 degrees anticlockwise, and the inclined edge of the prismatic reticular microtexture is processed tangentially in sequence until the other end is processed;
2.5) boring an inner hole with the diameter of 120mm on a circular plate, punching the inner hole to form an annular plate, clockwise sequentially milling 6 oil grooves on the annular plate, wherein each oil groove is in a half-sector shape, the fan angle is 21.8 degrees, the depth of each oil groove is 15mm, the fan angle of a half-sector composite bearing bush is arranged between every two adjacent oil grooves, the length of each composite bearing bush is 60mm, the width of each bearing bush is 60mm, the height of each bearing bush is 15mm, then boring an M8 bolt hole in the middle of each oil groove, the M8 bolt hole is a bearing bush base mounting hole, the machining tolerance is 0.02mm, and the shaft bush base chamfer angle is turned to be 0.5 multiplied by 45 degrees;
3) processing a bearing base: cutting a stainless steel bar material with the diameter of 310mm and the thickness of 65mm as a blank, turning the stainless steel bar material by using a lathe to remove the outer skin of the stainless steel bar material, performing finish machining to form a stainless steel bar with the diameter of 300mm and the thickness of 60mm, boring an inner hole with the diameter of 120mm in the center of the top of the steel bar, punching the inner hole, turning the stainless steel bar material with the diameter of 30mm on the outer circle of the steel bar, forming a flange with the diameter of 300mm and the thickness of 30mm by using a cutter with the feeding depth of 30mm, sequentially processing 6M 10 bolt holes at the edge of the flange, sequentially boring 6M 8 bolt holes at the top, chamfering the top circle to 0.5 multiplied by 45 degrees and processing the tolerance to 0.02mm, and performing heat treatment;
4) carrying out heat treatment on the austenitic stainless steel thrust disc, the bearing bush substrate and the bearing base;
4.1) putting the formed thrust disc, the bush substrate and the bearing pedestal into a high-temperature furnace, heating to 350 ℃, preserving heat for 1.5 hours, air-cooling and removing the processing stress;
4.2) solution treatment, continuing heating until the temperature reaches the range of 1050 ℃ of 1000-;
4.3) stabilizing treatment, continuing to return to the furnace, heating to 900 ℃, preserving heat for 3-5 hours, and cooling to room temperature in air;
4.4) additional tempering, heating to 200 ℃, preserving heat for 2-3 hours, and finally naturally cooling in a furnace;
5) assembling a bearing: firstly, a bearing base is installed on a frame by using 6M 10 bolts, then a composite layer of a composite bearing bush and a bearing bush base is installed above the bearing base by using 6M 8 bolts through bearing bush base installation holes, a layer of lubricating oil is injected into a modified PTFE layer with a prismatic net microtexture and the surface of an oil groove, and then an inference disk is installed right above the composite bearing bush to finish the assembly.
In the corrosion-resistant water pump thrust bearing with the composite bearing bush, the thickness ratio of the modified PTFE layer to the phosphor bronze spiral wire layer to the copper powder layer is 1: 2.
In the corrosion-resistant water pump thrust bearing with the composite bearing bush, the surface of the modified PTFE layer is processed with prismatic reticular microtexture.
The processing method of the corrosion-resistant water pump thrust bearing with the composite bearing bush has the following beneficial effects that: the scheme is through adopting femto second laser technique with the little texture processing of prism in thrust bearing axle bush surface, can effectual improvement thrust dish and the lubricated condition between the axle bush sliding friction surface, and pack nanometer ceramic powder and modify in advancing Polytetrafluoroethylene (PTFE) material, form compound axle bush material with phosphor bronze spiral silk and copper powder, have good wear resistance, bearing capacity and self-lubricating property, and thrust dish, axle bush base and bearing base all adopt stainless steel material to make, have good bearing capacity and corrosion resisting property, this has just solved the water pump bearing and need long-term work problem in the higher environment of humidity.
Drawings
FIG. 1 is a schematic view of 2/3 cut-away perspective view of a corrosion-resistant water pump thrust bearing of the composite bearing shell of the present invention;
FIG. 2 is a schematic view of the thrust plate of the present invention;
FIG. 3 is a schematic view of the combination of the composite bearing shell and the composite layer of the bearing shell substrate according to the present invention;
FIG. 4 is a schematic structural view of a composite bushing and a prismatic net-shaped microtexture according to the present invention;
FIG. 5 is a schematic flow chart of a method for processing a composite layer of a composite bearing shell and a bearing shell substrate according to the present invention.
In the figure: the thrust disc 1, the composite bush 2, the bush substrate 3, the bearing base 4, the key groove 11, the axial limiting groove 12, the modified PTFE21, the phosphor bronze spiral wire layer 22, the copper powder layer 23, the prismatic net-shaped microtexture 211, the bush substrate mounting hole 31 and the oil groove 32.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
As shown in figures 1 to 5, the method for processing the corrosion-resistant water pump thrust bearing of the composite bearing bush comprises a thrust disc 1, a composite bearing bush 2, a bearing bush base 3 and a bearing base 4, wherein a through hole is arranged in the middle of the thrust disc 1, a key groove 11 is arranged on the side surface of the through hole, an axial limiting groove 12 is arranged at the axial position of the through hole, the axial limiting groove 12 and the key groove 11 are arranged to enable a rotating shaft to be stably fixed on the rotating shaft, the thrust disc 1 is arranged above the composite bearing bush 2, the composite bearing bush 2 is sintered above the bearing bush base 3 in a hot-pressing manner, a bearing bush base mounting hole and an oil groove 32 are arranged on the bearing bush base 3, the bearing bush base 3 is arranged on the bearing base 4 through the bearing bush base mounting hole, the bearing base 4 is arranged below the bearing bush base 2, the composite bearing bush 2 is formed by hot-pressing and sintering of a modified PTFE layer 21, a phosphor bronze spiral thread layer 22 and a copper powder layer 23, the thickness ratio of the modified PTFE layer 21 to the phosphor bronze spiral wire layer 22 to the copper powder layer 23 is 1: 2, the surface of the modified PTFE layer 21 is processed with a prismatic reticular microtexture 211, and the specific processing method of the corrosion-resistant water pump thrust bearing of the composite bearing bush 2 is implemented according to the following steps:
1) machining a thrust disc 1: cutting a stainless steel bar material with the diameter of 280mm and the thickness of 35mm as a blank, removing the outer skin of the stainless steel bar material by using a lathe, performing finish machining to form a stainless steel disc with the diameter of 264mm and the thickness of 30mm, boring an inner hole with the diameter of 101mm in the center of the top of the disc, punching, turning an inner circle with the diameter of 121mm and the depth of 8mm from the top of the disc on the basis of the inner hole to form an axial limiting groove 12, cutting a key groove 11 with the width of 20mm and the depth of 6mm on the inner hole by using an slotting machine, wherein the machining tolerance is +/-0.02 mm, chamfering a roof circle to 0.5 multiplied by 45 degrees, and performing heat treatment;
2) and (3) composite layer processing of the composite bearing bush 2 and the bearing bush substrate 3: grinding a Polytetrafluoroethylene (PTFE) material into particles with the particle size of below 10um by using a ball mill, mixing nano ceramic powder and PTFE particles by using a hot pressing method, and performing hot melting and then finishing to obtain a modified PTFE plate material, namely a modified PTFE layer 21;
2.1) clockwise winding the phosphor bronze metal wire on a black bar with the diameter of 2mm to form a spiral shape, and forming a phosphor bronze spiral wire layer 22 after heat treatment;
2.2) cutting a stainless steel plate in a linear mode, forming 3 layers of a bearing bush substrate after finish machining, and carrying out heat treatment;
2.3) sintering copper powder on the stainless steel bearing bush substrate 3 by using a hot-pressing sintering furnace to form a complex of a copper powder layer 23 and the bearing bush substrate 3, then sintering a phosphor bronze spiral wire layer 22 on a copper powder-stainless steel substrate composite layer, finally sintering a modified PTFE layer 21 on the phosphor bronze spiral wire-copper powder-stainless steel substrate complex, and rolling to form a thin-wall composite bearing bush 2 and bearing bush substrate 3 composite layer sample;
2.4) cutting the composite layer of the composite bearing bush 2 and the bearing bush substrate 3 into a circular plate (the diameter is 240mm, the height is 30mm, wherein the height of the bearing bush substrate is 3mm, the height of the copper powder layer is 23 mm, the height of the phosphor bronze spiral wire layer is 22 mm, and the height of the modified PTFE layer is 21 mm), chamfering a 0.5 multiplied by 45 degree fillet on the outer circular edge of the plate, processing a prismatic reticular microtexture 211 on the surface of the modified PTFE layer 21 by adopting a femtosecond laser technology, wherein each texture is 0.5mm deep and 50um wide, and the prismatic reticular microtexture 211 is formed by mutually staggering prismatic edges forming an included angle of 40 degrees;
2.5) boring an inner hole with the diameter of 120mm on a circular plate, perforating to form an annular plate, clockwise sequentially milling 6 oil grooves 32 on the annular plate, wherein the oil grooves 32 are in a half-sector shape, the fan angle is 21.8 degrees, the depth of each oil groove 32 is 15mm, the fan angle of a half-sector composite bearing bush 2 is arranged between every two adjacent oil grooves 32, the length of each composite bearing bush 2 is 60mm, the width of each bearing bush is 60mm, and the height of each bearing bush is 15mm, then boring an M8 bolt hole in the middle of each oil groove 32, wherein the M8 bolt hole is a bearing bush base mounting hole 31, the machining tolerance is 0.02mm, and the chamfer angle of a turned bearing bush base 3 is 0.5 multiplied by 45 degrees;
3) and (3) processing a bearing base 4: cutting a stainless steel bar material with the diameter of 310mm and the thickness of 65mm as a blank, turning the stainless steel bar material by using a lathe to remove the outer skin of the stainless steel bar material, performing finish machining to form a stainless steel bar with the diameter of 300mm and the thickness of 60mm, boring an inner hole with the diameter of 120mm in the center of the top of the steel bar, punching the inner hole, turning the stainless steel bar material with the diameter of 30mm on the outer circle of the steel bar, forming a flange with the diameter of 300mm and the thickness of 30mm by using a cutter to feed the stainless steel bar material with the depth of 30mm, sequentially processing 6M 10 bolt holes (with the large hole diameter of 20mm, the depth of 10mm and the small hole punching the inner hole) at the edge of the flange, sequentially boring 6M 8 bolt holes (with the depth of 30mm) at the top, chamfering the roof circle to 0.5 multiplied by 45 degrees, and processing tolerance of 0.02mm, and performing heat treatment;
4) carrying out heat treatment on the austenitic stainless steel thrust disc 1, the bearing bush substrate 3 and the bearing pedestal 4;
4.1) putting the thrust disc 1, the bearing bush substrate 3 and the bearing pedestal 4 which are formed by processing into a high-temperature furnace, heating to 350 ℃, preserving heat for 1.5 hours, air cooling, and removing processing stress;
4.2) solution treatment, continuing heating until the temperature reaches the range of 1050 ℃ of 1000-;
4.3) stabilizing treatment, continuing to return to the furnace, heating to 900 ℃, preserving heat for 3-5 hours, and cooling to room temperature in air;
4.4) additional tempering, heating to 200 ℃, preserving heat for 2-3 hours, and finally naturally cooling in a furnace;
5) assembling a bearing: firstly, the bearing base 4 is installed on a frame by using 6 bolts of M10, then the composite layer of the composite bearing bush 2 and the bearing bush base 3 is installed above the bearing base 4 by using 6 bolts of M8 through the bearing bush base installation holes 31, a layer of lubricating oil is injected on the surfaces of the modified PTFE layer 21 with the prismatic net-shaped microtexture 211 and the oil grooves 32, and then the thrust disc 1 is installed right above the composite bearing bush 2, thus completing the assembly.
Example 1
When the thrust bearing is used, the thrust disc 1 is arranged on a rotating shaft through a flat key, meanwhile, the axial limiting groove 12 of the thrust disc 1 plays a role in preventing the rotating shaft from generating axial displacement, a layer of lubricating oil is injected into the surfaces of the modified PTFE layer 21 with the prismatic reticular microtexture 211 and the oil groove 32, and the thrust disc 1, the composite bearing bush 2 and the bearing bush substrate 3 are arranged on a bearing base through 6M 8 bolts. When the rotating shaft runs, the lubricating oil is gradually brought into the laser processing groove of the prismatic micro-texture 211 along with the thrust disc 1, which is equivalent to a micro oil groove, so that the lubricating oil can be supplemented between two friction contact surfaces of the thrust disc 1 and the bearing bush at any moment; under the action of axial load, a lubricating oil film layer is formed between two friction contact surfaces to generate oil pressure and increase the bearing capacity of the bearing, so that the lubricating performance of the bearing is improved; in addition, the bearing material is an anti-corrosion material, and is particularly suitable for water pump bearings which need to work in high-humidity environments for a long time.
The working principle of the invention is as follows: firstly, a thrust disc 1, a composite bearing bush 2, a bearing bush substrate 3 and a bearing base 4 are sequentially arranged on a rotating shaft, after the thrust disc, the composite bearing bush, the bearing bush substrate 3 and the bearing base 4 are fixed, when an engine is in a wet working environment, the lubricating condition between sliding friction surfaces is improved due to the prismatic net-shaped microtexture 211 processed on the surface of the modified PTFE layer 21, and lubricating oil is supplemented between two friction contact surfaces due to a micro oil groove on the surface, so that the lubricating property of the bearing is improved, the engineering plastic has good wear resistance and self-lubricating property, the engineering plastic is widely applied to the technical field of sliding bearings, and a reinforcement is added into the engineering plastic to be compositely processed with a steel blank substrate, so that the wear resistance and the bearing property of the plastic-metal three-layer composite material bearing can be improved. Thus, the object of the present invention is accomplished.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A processing method of a corrosion-resistant water pump thrust bearing of a composite bearing bush is characterized in that a through hole is formed in the middle of the thrust disc, a key groove is formed in the side face of the through hole, an axial limiting groove is formed in the axial position of the through hole, the thrust disc is installed above the composite bearing bush, the composite bearing bush is sintered above the bearing bush base in a hot-pressing mode, a bearing bush base installation hole and an oil groove are formed in the bearing bush base, the bearing bush base is installed on the bearing base through the bearing bush base installation hole, the bearing base is located below the bearing bush base, and the composite bearing bush is formed by hot-pressing and sintering of a modified PTFE layer, a phosphor bronze spiral wire layer and a copper powder layer;
the machining method of the thrust bearing comprises the following steps:
1) machining a thrust disc: cutting a stainless steel bar material with the diameter of 280mm and the thickness of 35mm as a blank, removing the outer skin of the stainless steel bar material by using a lathe, performing finish machining to form a stainless steel disc with the diameter of 264mm and the thickness of 30mm, boring an inner hole with the diameter of 101mm in the center of the top of the disc, punching, turning an inner circle with the diameter of 121mm and the depth of 8mm from the top of the disc on the basis of the inner hole to form an axial limiting groove, cutting a key position groove with the width of 20mm and the depth of 6mm on the inner hole by using an slotting machine, wherein the machining tolerance is 0.02mm, chamfering a roof circle to 0.5 multiplied by 45 degrees, and performing heat treatment;
2) processing a composite layer of the composite bearing bush and the bearing bush substrate: grinding a polytetrafluoroethylene material into particles with the particle size of below 10um by using a ball mill, mixing nano ceramic powder and PTFE particles by using a hot pressing method, and performing hot melting and finish machining to obtain a modified PTFE plate material, namely a modified PTFE layer;
2.1) clockwise winding the phosphor bronze metal wire on a black bar with the diameter of 2mm to form a spiral shape, and forming a phosphor bronze spiral wire layer after heat treatment;
2.2) cutting a stainless steel plate in a linear mode, forming a bearing bush substrate layer after finish machining, and carrying out heat treatment;
2.3) sintering copper powder on a stainless steel bearing bush substrate by using a hot-pressing sintering furnace to form a complex of a copper powder layer and the bearing bush substrate, sintering a phosphor bronze spiral wire layer on a copper powder-stainless steel substrate composite layer, sintering a modified PTFE layer on the phosphor bronze spiral wire-copper powder-stainless steel substrate complex, and rolling to form a thin-wall composite bearing bush and bearing bush substrate composite layer sample;
2.4) linearly cutting the composite bearing bush and the bearing bush substrate composite layer to form a circular plate, chamfering a fillet of 0.5 multiplied by 45 degrees at the outer circle edge of the plate, processing prismatic reticular microtexture on the surface of the modified PTFE layer by adopting a femtosecond laser technology, wherein each texture is 0.5mm deep and 50um wide, the prismatic reticular microtexture is formed by mutually staggering prismatic edges forming an included angle of 40 degrees, and during processing, a vertical edge is processed tangentially from the outer circle edge of the composite bearing bush and the bearing bush substrate composite layer until the vertical edge is processed to the other end, then the composite layer is rotated 40 degrees anticlockwise, and the inclined edge of the prismatic reticular microtexture is processed tangentially in sequence until the other end is processed;
2.5) boring an inner hole with the diameter of 120mm on a circular plate, punching the inner hole to form an annular plate, clockwise sequentially milling 6 oil grooves on the annular plate, wherein each oil groove is in a half-sector shape, the fan angle is 21.8 degrees, the depth of each oil groove is 15mm, the fan angle of a half-sector composite bearing bush is arranged between every two adjacent oil grooves, the length of each composite bearing bush is 60mm, the width of each bearing bush is 60mm, the height of each bearing bush is 15mm, then boring an M8 bolt hole in the middle of each oil groove, the M8 bolt hole is a bearing bush base mounting hole, the machining tolerance is 0.02mm, and the shaft bush base chamfer angle is turned to be 0.5 multiplied by 45 degrees;
3) processing a bearing base: cutting a stainless steel bar material with the diameter of 310mm and the thickness of 65mm as a blank, turning the stainless steel bar material by using a lathe to remove the outer skin of the stainless steel bar material, performing finish machining to form a stainless steel bar with the diameter of 300mm and the thickness of 60mm, boring an inner hole with the diameter of 120mm in the center of the top of the steel bar, punching the inner hole, turning the stainless steel bar material with the diameter of 30mm on the outer circle of the steel bar, forming a flange with the diameter of 300mm and the thickness of 30mm by using a cutter with the feeding depth of 30mm, sequentially processing 6M 10 bolt holes at the edge of the flange, sequentially boring 6M 8 bolt holes at the top, chamfering the top circle to 0.5 multiplied by 45 degrees and processing the tolerance to 0.02mm, and performing heat treatment;
4) carrying out heat treatment on the austenitic stainless steel thrust disc, the bearing bush substrate and the bearing base;
4.1) putting the formed thrust disc, the bush substrate and the bearing pedestal into a high-temperature furnace, heating to 350 ℃, preserving heat for 1.5 hours, air-cooling and removing the processing stress;
4.2) solution treatment, continuing heating until the temperature reaches the range of 1050 ℃ of 1000-;
4.3) stabilizing treatment, continuing to return to the furnace, heating to 900 ℃, preserving heat for 3-5 hours, and cooling to room temperature in air;
4.4) additional tempering, heating to 200 ℃, preserving heat for 2-3 hours, and finally naturally cooling in a furnace;
5) assembling a bearing: firstly, a bearing base is installed on a frame by using 6M 10 bolts, then a composite layer of a composite bearing bush and a bearing bush base is installed above the bearing base by using 6M 8 bolts through bearing bush base installation holes, a layer of lubricating oil is injected into a modified PTFE layer with a prismatic net microtexture and the surface of an oil groove, and then an inference disk is installed right above the composite bearing bush to finish the assembly.
2. The method for processing the corrosion-resistant water pump thrust bearing of the composite bearing shell according to claim 1, wherein the thickness ratio of the modified PTFE layer to the phosphor bronze spiral wire layer to the copper powder layer is 1: 2.
3. The processing method of the corrosion-resistant water pump thrust bearing with the composite bearing shell as recited in claim 2, wherein prismatic net-shaped microtexture is processed on the surface of the modified PTFE layer.
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| CN1967001A (en) * | 2005-11-18 | 2007-05-23 | 孙守驯 | Elastic metal-plastic bearing made of fluoroplastic and polyphenyl ester |
| CN101102891A (en) * | 2005-01-17 | 2008-01-09 | 奥依列斯工业株式会社 | Multilayer sliding member |
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| CN111120504A (en) * | 2019-12-27 | 2020-05-08 | 西安交通大学 | Self-feedback adjustment thermal deformation high-bearing thrust sliding bearing |
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| US5961218A (en) * | 1996-02-20 | 1999-10-05 | Ebara Corporation | Water lubricated machine component having contacting sliding surfaces |
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| CN101102891A (en) * | 2005-01-17 | 2008-01-09 | 奥依列斯工业株式会社 | Multilayer sliding member |
| CN1967001A (en) * | 2005-11-18 | 2007-05-23 | 孙守驯 | Elastic metal-plastic bearing made of fluoroplastic and polyphenyl ester |
| CN105508414A (en) * | 2016-01-12 | 2016-04-20 | 中国人民解放军海军工程大学 | Damping-type tilting pad thrust bearing |
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