CA2670200C - A lead-free self-lubricating bearing and its producing method - Google Patents
A lead-free self-lubricating bearing and its producing method Download PDFInfo
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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
- F16C33/201—Composition of the plastic
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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
-
- 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
- F16C2204/12—Alloys based on copper with tin as the next major constituent
-
- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/08—Time
-
- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/48—Particle sizes
-
- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/60—Thickness, e.g. thickness of coatings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sliding-Contact Bearings (AREA)
- Powder Metallurgy (AREA)
- Laminated Bodies (AREA)
Abstract
A lead-free self-lubricating bearing is mainly made up of a metal base plate, a global porous bronze powder layer bonded on the base plate and a wear-resistance plastic laver which is sintered and covered on the bronze powder layer. A coiling procedure is used during producing the bearing.
There is no lead in the bronze powder layer or the plastic layer. And the plastic layer includes powder of PPS, EKONOL, MoS2, PTFE and aramid fiber. A method producing said bearing is also disclosed. It includes bonding the bronze powder layer on the metal plate, producing a viscid spreadable mush of the plastic layer, and rolling after spreading, drying, mid-rolling, bonding, and final-rolling. The bearing has better wear-resistance property and can be applied in the fields such as food, pharmacy, and so on, due to lead-free.
There is no lead in the bronze powder layer or the plastic layer. And the plastic layer includes powder of PPS, EKONOL, MoS2, PTFE and aramid fiber. A method producing said bearing is also disclosed. It includes bonding the bronze powder layer on the metal plate, producing a viscid spreadable mush of the plastic layer, and rolling after spreading, drying, mid-rolling, bonding, and final-rolling. The bearing has better wear-resistance property and can be applied in the fields such as food, pharmacy, and so on, due to lead-free.
Description
PCTCN2008.%071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy Specification A Lead-free Self-Lubricating Bearing and its Producing Method Field of the Invention The invention relates to a sliding bearing, particularly a lead-free self-lubricating bearing made of a three-layer compounded material.
Background Art The DU bearing, which came into existence as early as 1970s, is a three-layer compounded bearing, but the inner lining of its frictional layer is sintered with a mixture of polytetrafluoroethylene (PTEE) and lead (Pb). In some application fields such lining may replace a copper alloy shaft sleeve and achieve a lower manufacturing cost and a longer service duration but since the friction-reduction layer of the bearing comprises lead components where lead and its compounds are toxic substances, when the bearing is in operation lead powder will he generated as a result of wear caused by abrasive grain and gaseous lead will be emitted under a high temperature condition. Besides, the recycling of used and waste bearings is an issue. Such problems bring harm to the human body and the environment. With an increased environmental consciousness among people, the use of such product has been prohibited or restricted in automobile, food, pharmacy, home electric appliance, fitness, office, beverage and other machine manufacturing industries. We have noticed that relevant environmental protection standards have been issued in Europe and America: for example the European ROHS Directive regarding heavy metals and hazardous substances has laid down specific requirements in this regard.
It will be an ideal upgrade for conventional products like the DU bearing if the critical problem related to the existence of lead, other heavy metals and hazardous substances in the plastics lining layer, or the friction-reduction, wear-resistant layer, of the bearing can be overcome effectively while the bearing operates satisfactorily.
The main object of the invention is to investigate and provide a material composition of the inner PCT'CN2008071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy lining (the friction-reduction plastics laver) of the bearing, so as to not only exclude the hazardous substance -- lead used in the DU bearing but also replace the lead, which has a low friction coefficient, with a polymer comprising the materials described below.
Meanwhile, the mechanical.
physical and frictional properties of the upgraded bearing will be made superior to those of the DU bearing.
Polvtetrafluoroethvlene, PTFE for short, exhibits excellent frictional behaviour and has the lowest friction coefficient among all plastics. It is often used as lubrication agent for the inner lining of a sliding bearing, and it may serve as a filling with a low-friction coefficient therefor. However, polytetrafluoroethylene is rarely used alone as its mechanical strength and modulus of elasticity is extreme low when used alone. It is well known that, in practice, a wear-resistance filling and/or other materials for strengthening the lining must he added to make the lining suitable for heaN s-load, low-speed or light-load, high-speed movement.
Among all engineering plastics, aromatic polyester, EKONOI for short, is characterized by its metal-like properties and the highest thermal conductivity, farther it exhibits excellent dimensional stability outstanding creep behaviour under compression, good anti-abrasion property; excellent self-lubrication and hardness. The above attributes effectively overcome the problems arising from using polytetrafluoroethylene alone. Pol\imide, PI for short, has similar characteristics and is therefore a substitute material for aromatic polyester.
Polyphenylene sulphide, PPS for short, is a kind of thermoplastic polymer with high temperature resistance. It features outstanding high-temperature resistance, corrosion resistance, chemical stability and it can enhance the adhesive strength with respect to metal, various powders or fibres.
It is proved to be the best high-temperature adhesive. Tests show that adding polyphenylene sulphide to a friction-reduction plastic layer improves fatigue strength and reduces cavitation.
However, pohphenylene sulphide should firstly go through chemical cross-linking, a matured technology. and usually, accelerant such as magnesium-fluoride need to be added. The cross-linking lasts 20 minutes.
Background Art The DU bearing, which came into existence as early as 1970s, is a three-layer compounded bearing, but the inner lining of its frictional layer is sintered with a mixture of polytetrafluoroethylene (PTEE) and lead (Pb). In some application fields such lining may replace a copper alloy shaft sleeve and achieve a lower manufacturing cost and a longer service duration but since the friction-reduction layer of the bearing comprises lead components where lead and its compounds are toxic substances, when the bearing is in operation lead powder will he generated as a result of wear caused by abrasive grain and gaseous lead will be emitted under a high temperature condition. Besides, the recycling of used and waste bearings is an issue. Such problems bring harm to the human body and the environment. With an increased environmental consciousness among people, the use of such product has been prohibited or restricted in automobile, food, pharmacy, home electric appliance, fitness, office, beverage and other machine manufacturing industries. We have noticed that relevant environmental protection standards have been issued in Europe and America: for example the European ROHS Directive regarding heavy metals and hazardous substances has laid down specific requirements in this regard.
It will be an ideal upgrade for conventional products like the DU bearing if the critical problem related to the existence of lead, other heavy metals and hazardous substances in the plastics lining layer, or the friction-reduction, wear-resistant layer, of the bearing can be overcome effectively while the bearing operates satisfactorily.
The main object of the invention is to investigate and provide a material composition of the inner PCT'CN2008071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy lining (the friction-reduction plastics laver) of the bearing, so as to not only exclude the hazardous substance -- lead used in the DU bearing but also replace the lead, which has a low friction coefficient, with a polymer comprising the materials described below.
Meanwhile, the mechanical.
physical and frictional properties of the upgraded bearing will be made superior to those of the DU bearing.
Polvtetrafluoroethvlene, PTFE for short, exhibits excellent frictional behaviour and has the lowest friction coefficient among all plastics. It is often used as lubrication agent for the inner lining of a sliding bearing, and it may serve as a filling with a low-friction coefficient therefor. However, polytetrafluoroethylene is rarely used alone as its mechanical strength and modulus of elasticity is extreme low when used alone. It is well known that, in practice, a wear-resistance filling and/or other materials for strengthening the lining must he added to make the lining suitable for heaN s-load, low-speed or light-load, high-speed movement.
Among all engineering plastics, aromatic polyester, EKONOI for short, is characterized by its metal-like properties and the highest thermal conductivity, farther it exhibits excellent dimensional stability outstanding creep behaviour under compression, good anti-abrasion property; excellent self-lubrication and hardness. The above attributes effectively overcome the problems arising from using polytetrafluoroethylene alone. Pol\imide, PI for short, has similar characteristics and is therefore a substitute material for aromatic polyester.
Polyphenylene sulphide, PPS for short, is a kind of thermoplastic polymer with high temperature resistance. It features outstanding high-temperature resistance, corrosion resistance, chemical stability and it can enhance the adhesive strength with respect to metal, various powders or fibres.
It is proved to be the best high-temperature adhesive. Tests show that adding polyphenylene sulphide to a friction-reduction plastic layer improves fatigue strength and reduces cavitation.
However, pohphenylene sulphide should firstly go through chemical cross-linking, a matured technology. and usually, accelerant such as magnesium-fluoride need to be added. The cross-linking lasts 20 minutes.
PCT=CN2008=071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy Aramid fibre, with a trade name Kevlar (produced by DuPont Company based in US), is an organic fibre with excellent performances and features super high strength, super high modulus, high temperature resistance and low density. Its strength is 3 times higher than that of ordinary organic fibres and its modulus of elasticity is 10 times that of nylon and 9 times that of polyester.
Aramid fibre has such characteristics as high impact toughness and fatigue strength, good dielectric property and chemical stability, low expansion rate, low thermal conductiyit', non-ignitability, infusibility, etc. Filling PTFT with aramid fibre may greatly improve the mechanical performance. load capability, anti-friction and wear resistance of the bearing.
Molybdenum disulphide. MoS2 for short, belongs to the family of hexagonal system laminate structures. Its layers can slide over each other very easily and it thus has good self lubricating property, it can firmly adhere to a metal surface and is not easily damaged under friction, thus it can bear heavy load. Statistics shows that an MoS2 film with a thickness of 2.51.m can bear a pressure of over 2800MPa while at a friction speed of 40m/s. When MOS2 is added the friction and wear properties of the bearing will be obviously improved and the initial abrasion of the bearing will be reduced. Sometimes MoS2 may be replaced by graphite.
The above description of the conventional sliding bearings and DU bearings fully proves the progress made by the mankind in scientific and technical development. The main object of the present invention is to investigate and provide compositions of lead-free materials for a friction-reduction lining of a self-lubricating bearing. At the same time, the bearing exhibits superior mechanical, physical and frictional properties to those of a DU
bearing. The ultimate object is to provide a three-layer compounded lead-free self-lubricating bearing and methods of manufacturing thereof.
Summary of the Invention The object of the invention is to provide a lead-free self-lubricating bearing and methods of manufacturing thereof The lead-free self-lubricating bearing can not only operate under oil PCT CN2008 07109 1 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy lubricating conditions and is corrosion resistant, but it can also operate under rigorous lubricating conditions, such as marginally oil lubricating or even dry- friction conditions. Particularly, the bearing does not comprise lead or lead compounds and it can meet the requirements of the European ROHS regulations on heavy metals and hazardous substances. The self-lubricating bearing can be widely used in automobile, food, pharmacy, home electrical appliance, beverage, office. medicine and other machine manufacturing industries.
The object of the invention is achieved through the following technical solution: The lead-free self-lubricating bearing mainly comprises a metal base-plate, a porous layer of spherical bronze powder sintered on the base-plate, and a friction-reduction and wear-resistant plastic layer which penetrates into and covers the bronze powder layer. Further, a roll-manufacturing technique is used to make the sliding hearing. A characteristic of the invention is that said spherical bronze powder is lead-free and the friction-reduction plastic layer is lead-free. The polymer composition of said friction-reduction, wear-resistance plastic layer, i.e. the bearing lining, comprises, by weight, 10--20% polyphenyl thioether superfine powder, 1 0 -20% aromatic polyester superfine powder, 10--20% aramid fibre with a fibre length of 40--120 m, and 6-10% molybdenum disulphide superfine powder, the rest being polytetrafluoroethylene superfine powder.
Said metal base-plate is made of a rolled belt of high quality mild steel. The width of the rolled steel belt 150-300mm and the thickness thereof is 0.25-2.70mm. A surface of the rolled steel belt is plated with copper: the plated copper layer having a thickness of 4-61tm.
Either CuSn8P or CuSn10 is selected as the spherical bronze powder sintered on the metal base-plate.
A method of manufacturing a lead-free self-lubricating sliding bearing comprises the following procedures:
A. Select SAE1010 or SAE1008 brand or SPCC rolled steel belt as the metal base-plate.
B. Sinter on the metal base-plate a layer of lead-free spherical bronze powder. the diameter of the spherical powder being 60.140 m and the sintered thickness being 025-0.40mm.
C. Make an extendable soft paste for a friction-reduction and wear-resistant laver:
Aramid fibre has such characteristics as high impact toughness and fatigue strength, good dielectric property and chemical stability, low expansion rate, low thermal conductiyit', non-ignitability, infusibility, etc. Filling PTFT with aramid fibre may greatly improve the mechanical performance. load capability, anti-friction and wear resistance of the bearing.
Molybdenum disulphide. MoS2 for short, belongs to the family of hexagonal system laminate structures. Its layers can slide over each other very easily and it thus has good self lubricating property, it can firmly adhere to a metal surface and is not easily damaged under friction, thus it can bear heavy load. Statistics shows that an MoS2 film with a thickness of 2.51.m can bear a pressure of over 2800MPa while at a friction speed of 40m/s. When MOS2 is added the friction and wear properties of the bearing will be obviously improved and the initial abrasion of the bearing will be reduced. Sometimes MoS2 may be replaced by graphite.
The above description of the conventional sliding bearings and DU bearings fully proves the progress made by the mankind in scientific and technical development. The main object of the present invention is to investigate and provide compositions of lead-free materials for a friction-reduction lining of a self-lubricating bearing. At the same time, the bearing exhibits superior mechanical, physical and frictional properties to those of a DU
bearing. The ultimate object is to provide a three-layer compounded lead-free self-lubricating bearing and methods of manufacturing thereof.
Summary of the Invention The object of the invention is to provide a lead-free self-lubricating bearing and methods of manufacturing thereof The lead-free self-lubricating bearing can not only operate under oil PCT CN2008 07109 1 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy lubricating conditions and is corrosion resistant, but it can also operate under rigorous lubricating conditions, such as marginally oil lubricating or even dry- friction conditions. Particularly, the bearing does not comprise lead or lead compounds and it can meet the requirements of the European ROHS regulations on heavy metals and hazardous substances. The self-lubricating bearing can be widely used in automobile, food, pharmacy, home electrical appliance, beverage, office. medicine and other machine manufacturing industries.
The object of the invention is achieved through the following technical solution: The lead-free self-lubricating bearing mainly comprises a metal base-plate, a porous layer of spherical bronze powder sintered on the base-plate, and a friction-reduction and wear-resistant plastic layer which penetrates into and covers the bronze powder layer. Further, a roll-manufacturing technique is used to make the sliding hearing. A characteristic of the invention is that said spherical bronze powder is lead-free and the friction-reduction plastic layer is lead-free. The polymer composition of said friction-reduction, wear-resistance plastic layer, i.e. the bearing lining, comprises, by weight, 10--20% polyphenyl thioether superfine powder, 1 0 -20% aromatic polyester superfine powder, 10--20% aramid fibre with a fibre length of 40--120 m, and 6-10% molybdenum disulphide superfine powder, the rest being polytetrafluoroethylene superfine powder.
Said metal base-plate is made of a rolled belt of high quality mild steel. The width of the rolled steel belt 150-300mm and the thickness thereof is 0.25-2.70mm. A surface of the rolled steel belt is plated with copper: the plated copper layer having a thickness of 4-61tm.
Either CuSn8P or CuSn10 is selected as the spherical bronze powder sintered on the metal base-plate.
A method of manufacturing a lead-free self-lubricating sliding bearing comprises the following procedures:
A. Select SAE1010 or SAE1008 brand or SPCC rolled steel belt as the metal base-plate.
B. Sinter on the metal base-plate a layer of lead-free spherical bronze powder. the diameter of the spherical powder being 60.140 m and the sintered thickness being 025-0.40mm.
C. Make an extendable soft paste for a friction-reduction and wear-resistant laver:
PCT CN2008d) i 1081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy (1) Perform pohphenylene sulphide chemical Cross-linking. As this is a publicly known matured technology, no details thereof will be described herein.
(2) Prepare powder and fibre according to the above mentioned weight composition.
(3) Stir: mix the prepared powder and fibre and stir them at least three times, 5-10 minutes each time, to form a mixture. The rotation speed of the stirring machine is 2000-4000r/min. Sieve the mixture at least three times, with sieve mesh of 100 or more.
(4) Make the extendable soft paste: mix 1000g of the powder mixture with 800g polvtetrafluoroethylene emulsion with 60% solid content; stir for 5-I0min in a stirring machine at a rotation speed of 20-60r/min; a preferable environment temperature is 1525 C.
(2) Prepare powder and fibre according to the above mentioned weight composition.
(3) Stir: mix the prepared powder and fibre and stir them at least three times, 5-10 minutes each time, to form a mixture. The rotation speed of the stirring machine is 2000-4000r/min. Sieve the mixture at least three times, with sieve mesh of 100 or more.
(4) Make the extendable soft paste: mix 1000g of the powder mixture with 800g polvtetrafluoroethylene emulsion with 60% solid content; stir for 5-I0min in a stirring machine at a rotation speed of 20-60r/min; a preferable environment temperature is 1525 C.
(5) In order that the soft paste exhibits good fluidity when spread on the sintered layer of spherical bronze powder, 4-6% ethanol should be added when the mixture and the polytetrafluoroethylene emulsion are stirred, so as to make the soft paste even softer.
D. Automatically spread and roll the soft paste on the bronze powder layer of the two-layer compounded belt on a production line in a way that part of the soft paste penetrates into the pores of the porous layer of spherical bronze powder and a lining layer is formed to cover the spherical powder layer. Preferably no bronze powder is exposed. Usually, the covering layer is 0.01-0.03nun thick, but it can be thickened to up to 0.2mm if needed. E. Dry the belt at the temperature of 220-28(>"C for 15-25 minutes, until the moisture in the pohietrafluoroethylene emulsion completely volatilizes.
F. Intermediate rolling: Roll the dried belt once, with a rolling reduction of 0.0150.03mm. to increase the density of the polytetrafluoroethylene in the pores of the spherical bronze powder layer and the cohesion there-between.
G Sinter the friction-reduction plastic layer in a channel-type nitrogen shield sintering furnace, including three phases, namely, preheating, heating and heat preserving. The sintering heating temperature is 380-390 C. The total sintering period is 15--25 minutes of which 8- 10 minutes are for the pre-heating. In order that the belt is not oxidized during the sintering, nitrogen is used in the furnace channel as a protective gas with a purity of 99.9% or above. The minimum flow rate of nitrogen for different sintering furnaces is determined based on that oxidization does not occur.
H. Final rolling: roll the sintered belt into a finished belt in compliance with the requirement of a PCT. CN2008 0 7 1081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy finished belt. The minimum rolling reduction is 0.02mm or more.
1. Wind up the finished three-layer compounded lead-free self-lubricating belt with a winding machine. Unload it after fixing it by binding.
J. Cut the belt into strips according to bearing specifications. For mass production, unwind the wound three-layer compounded lead-free self-lubricating rolled belt and cut it into strips of a same width or different widths and wind up each strip.
K. Bearing manufacturing: the whole process of manufacturing the three-layer compounded lead-free self-lubricating bearing is completed by forming, on an automatic moulding machine, the stripes into the three-layer compounded lead-free self-lubricating bearing according to bearing requirements. For small scale production where manufacturing on an automatic moulding machine is not suitable, a conventional rolling technique for manufacturing bearings may be adopted:.
conventional equipment and working procedure are used to complete the manufacturing of the three-layer compounded lead-free self-lubricating bearing.
The invention sinters a laver of lead-free spherical bronze powder on the metal base-plate made of a rolled steel belt. The sintering furnace is a channel-type sintering furnace using mixed hydrogen-nitrogen as a protective gas, with 50% hydrogen and 50% nitrogen. The sintering lasts 8-10 minutes at 880-900 C. If needed, pigment that can withstand a sintering temperature of up to 400 C may be added during the procedure of preparing the powder and fibre in order to color the lining of the finished bearing.
As described above, the invention further optimizes the material composition of the friction-reduction and wear-resistant plastic layer. Particularly. high performance organic fibre Kevlar is added. greatly enhancing the wear resistance. the fatigue strength and the load capacity of the bearing.
The metal base-plate according to the invention is made of a rolled steel belt. The whole manufacturing process of the three-layer compounded material can be accomplished on a production line. A whole roll of steel belt purchased from a steel mill is plated with copper and PCT CN2008 07 1081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy then loaded on a unwinding machine. Through unwinding and flattening, being automatically spread with bronze powder, and sintering and rolling, it is made into a two-layer compounded porous belt. Further through automatic spreading and rolling of a soft paste of friction-reduction, wear-resistant plastics, followed by drying, intermediate rolling. sintering, final rolling and winding up, the whole process of manufacturing the three-layer compounded material for a self-lubricating bearing is completed.
A commodity name of the three-layer compounded, lead-free, self-lubricating bearing manufactured according to the above method is CSB-50.
The invention overcomes the disadvantage that a lead comprising friction-reduction plastics layer makes a compounded bearing unsuitable for use in automobile, food, pharmacy, home appliance, office., beverage and other machine manufacturing industries. The product is characterized by a simple structure, high operation efficiency, a long service duration, and an easy and convenient manufacturing technique, etc. The results of three tests for comparing the invented CSB-50 three-layer compounded lead-free self-lubricating bearing and the DU bearing on the market under the same working conditions -are given below:
(1) Comparison made on M2000 friction/wwear testing machine (F=196N V=0.4m/s, Time: 120 minutes) Dry friction Oil lubrication Bearing Model Friction Grinding crack Friction Grinding crack Coefficient ( ) width (b) Coefficient ( ) wwidth (b) DU on the 0.13 3.9 0.03 2.7 market CSB-50 0.12 2.8 0.03 2.2 (2) Comparison made on MMU-12 end-face friction/wear testing machine (Dry friction P=8N/mm2, V=0.2mis. Time: 180 minutes) PCT CN2008%071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy Loss caused by wear Bearing Model Friction Coefficient (.t) Temperature (F I) (E) DU on the market 0.13 93 16 CSB-50 0.12 87 11 (3) Test of gravity loss of PTFE friction-reduction laver in ultrasonic Oscillation frequency: 20KHz. Oscillation amplitude: 501un. Medium: water.
Clearance: 1.3mm.
Time: 10 minutes Bearing Model Gravity loss in 10 minutes (mg) DU on the market 22 The results of the above three different tests show that, regardless of the type of test, the CSB-50 lead-free self-lubricating bearing is obviously superior to the DU bearing available on the market in terms of friction and wear properties.
Description of the Figure Figure 1 is a flow chart showing a manufacturing process according to the invention.
Detailed Description of the Embodiments Below is a detailed description of the invention with reference to the figure and particular embodiments: The invention mainly comprises a metal base-plate, a porous laver of spherical bronze powder sintered on the base-plate, and a friction-reduction and wear-resistant plastics layer that penetrates into and covers the bronze powder layer. Further, a rolling technique is used to make a sliding bearing. Said spherical bronze powder is lead-free and the friction-reduction plastic layer is also lead-free. The polymer composition of said friction-reduction plastic layer, i.e. the inner lining of the bearing, comprises, by weight, 10-20% polyphenyl thioether superfine powder, 10-20% aromatic polyester superfine powder, 10-20% aramid fibre with a fibre length of 40-120 m, and 6-10% molybdenum disulphide superfine powder, the rest being PCT CN2008 071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy polytetrafluoroethylene superfine powder.
Said metal base-plate is made of a rolled belt of high quality mild steel. The width of the rolled steel plate is 150-300mm and the thickness thereof is 0.25-2.70mm. A surface of the rolled steel belt is plated with copper, the plated copper layer having a thickness of 46 m. Either CuSn8P or CuSn10 is selected as the spherical bronze powder to be sintered on the metal base-plate.
Referring to Fig. 1, a method of manufacturing the lead-free self-lubricating sliding bearing according to the invention comprises the following procedures:
A. Select SAEIOIO or SAE1008 brand or SPCC rolled steel belt as the metal base-plate.
B. Sinter on the metal base-plate a laver of lead-free spherical bronze powder, the diameter of the spherical diameter being 60-1401tm, the sintered thickness being 0.25-0.40mm. The sintering furnace is a channel-type sintering furnace using mixed hydrogen-nitrogen as a protective gas, with 50% hydrogen and 50% nitrogen. The sintering lasts 8-10 minutes at 880900 C.
C. Make an extendable soft paste for a friction-reduction and wear-resistant laver:
(1) Perform pohphenylene sulphide chemical cross-linking.
(2) Prepare powder and fibre according to the above-mentioned weight composition. If needed, pigment that can withstand a sintering temperature of up to 400 C may be added to color the lining of the finished bearing.
(3) Stir: mix the prepared powder and fibre and stir them three times, 5-10 minutes each time., to form a mixture. The rotation speed of the stirring machine is 2000-4000r/min. Sieve the mixture three times, with sieve mesh of 100 or more.
(4) Make the extendable soft paste: mix 1000g of the powder mixture with 800g polvtetrafluoroethylene emulsion with 60% solid content: stir for 5-10min in the stirring machine at a rotation speed of 20-60r/min: a preferable environment temperature is 15--25 C.
(5) In order that the soft paste exhibits good fluidity when spread on the sintered layer of spherical bronze powder, 4-6% ethanol should be added when the mixture and the polytetrafluoroethylene emulsion are stirred, so as to make the soft paste even softer.
D. Automatically spread and roll the soft paste on the bronze powder layer of the two-layer compounded belt on a production line in a way that part of the soft paste penetrates into the pores of the porous layer of spherical bronze powder and a lining layer is formed to cover the spherical powder layer. Preferably no bronze powder is exposed. Usually, the covering layer is 0.01-0.03nun thick, but it can be thickened to up to 0.2mm if needed. E. Dry the belt at the temperature of 220-28(>"C for 15-25 minutes, until the moisture in the pohietrafluoroethylene emulsion completely volatilizes.
F. Intermediate rolling: Roll the dried belt once, with a rolling reduction of 0.0150.03mm. to increase the density of the polytetrafluoroethylene in the pores of the spherical bronze powder layer and the cohesion there-between.
G Sinter the friction-reduction plastic layer in a channel-type nitrogen shield sintering furnace, including three phases, namely, preheating, heating and heat preserving. The sintering heating temperature is 380-390 C. The total sintering period is 15--25 minutes of which 8- 10 minutes are for the pre-heating. In order that the belt is not oxidized during the sintering, nitrogen is used in the furnace channel as a protective gas with a purity of 99.9% or above. The minimum flow rate of nitrogen for different sintering furnaces is determined based on that oxidization does not occur.
H. Final rolling: roll the sintered belt into a finished belt in compliance with the requirement of a PCT. CN2008 0 7 1081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy finished belt. The minimum rolling reduction is 0.02mm or more.
1. Wind up the finished three-layer compounded lead-free self-lubricating belt with a winding machine. Unload it after fixing it by binding.
J. Cut the belt into strips according to bearing specifications. For mass production, unwind the wound three-layer compounded lead-free self-lubricating rolled belt and cut it into strips of a same width or different widths and wind up each strip.
K. Bearing manufacturing: the whole process of manufacturing the three-layer compounded lead-free self-lubricating bearing is completed by forming, on an automatic moulding machine, the stripes into the three-layer compounded lead-free self-lubricating bearing according to bearing requirements. For small scale production where manufacturing on an automatic moulding machine is not suitable, a conventional rolling technique for manufacturing bearings may be adopted:.
conventional equipment and working procedure are used to complete the manufacturing of the three-layer compounded lead-free self-lubricating bearing.
The invention sinters a laver of lead-free spherical bronze powder on the metal base-plate made of a rolled steel belt. The sintering furnace is a channel-type sintering furnace using mixed hydrogen-nitrogen as a protective gas, with 50% hydrogen and 50% nitrogen. The sintering lasts 8-10 minutes at 880-900 C. If needed, pigment that can withstand a sintering temperature of up to 400 C may be added during the procedure of preparing the powder and fibre in order to color the lining of the finished bearing.
As described above, the invention further optimizes the material composition of the friction-reduction and wear-resistant plastic layer. Particularly. high performance organic fibre Kevlar is added. greatly enhancing the wear resistance. the fatigue strength and the load capacity of the bearing.
The metal base-plate according to the invention is made of a rolled steel belt. The whole manufacturing process of the three-layer compounded material can be accomplished on a production line. A whole roll of steel belt purchased from a steel mill is plated with copper and PCT CN2008 07 1081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy then loaded on a unwinding machine. Through unwinding and flattening, being automatically spread with bronze powder, and sintering and rolling, it is made into a two-layer compounded porous belt. Further through automatic spreading and rolling of a soft paste of friction-reduction, wear-resistant plastics, followed by drying, intermediate rolling. sintering, final rolling and winding up, the whole process of manufacturing the three-layer compounded material for a self-lubricating bearing is completed.
A commodity name of the three-layer compounded, lead-free, self-lubricating bearing manufactured according to the above method is CSB-50.
The invention overcomes the disadvantage that a lead comprising friction-reduction plastics layer makes a compounded bearing unsuitable for use in automobile, food, pharmacy, home appliance, office., beverage and other machine manufacturing industries. The product is characterized by a simple structure, high operation efficiency, a long service duration, and an easy and convenient manufacturing technique, etc. The results of three tests for comparing the invented CSB-50 three-layer compounded lead-free self-lubricating bearing and the DU bearing on the market under the same working conditions -are given below:
(1) Comparison made on M2000 friction/wwear testing machine (F=196N V=0.4m/s, Time: 120 minutes) Dry friction Oil lubrication Bearing Model Friction Grinding crack Friction Grinding crack Coefficient ( ) width (b) Coefficient ( ) wwidth (b) DU on the 0.13 3.9 0.03 2.7 market CSB-50 0.12 2.8 0.03 2.2 (2) Comparison made on MMU-12 end-face friction/wear testing machine (Dry friction P=8N/mm2, V=0.2mis. Time: 180 minutes) PCT CN2008%071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy Loss caused by wear Bearing Model Friction Coefficient (.t) Temperature (F I) (E) DU on the market 0.13 93 16 CSB-50 0.12 87 11 (3) Test of gravity loss of PTFE friction-reduction laver in ultrasonic Oscillation frequency: 20KHz. Oscillation amplitude: 501un. Medium: water.
Clearance: 1.3mm.
Time: 10 minutes Bearing Model Gravity loss in 10 minutes (mg) DU on the market 22 The results of the above three different tests show that, regardless of the type of test, the CSB-50 lead-free self-lubricating bearing is obviously superior to the DU bearing available on the market in terms of friction and wear properties.
Description of the Figure Figure 1 is a flow chart showing a manufacturing process according to the invention.
Detailed Description of the Embodiments Below is a detailed description of the invention with reference to the figure and particular embodiments: The invention mainly comprises a metal base-plate, a porous laver of spherical bronze powder sintered on the base-plate, and a friction-reduction and wear-resistant plastics layer that penetrates into and covers the bronze powder layer. Further, a rolling technique is used to make a sliding bearing. Said spherical bronze powder is lead-free and the friction-reduction plastic layer is also lead-free. The polymer composition of said friction-reduction plastic layer, i.e. the inner lining of the bearing, comprises, by weight, 10-20% polyphenyl thioether superfine powder, 10-20% aromatic polyester superfine powder, 10-20% aramid fibre with a fibre length of 40-120 m, and 6-10% molybdenum disulphide superfine powder, the rest being PCT CN2008 071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy polytetrafluoroethylene superfine powder.
Said metal base-plate is made of a rolled belt of high quality mild steel. The width of the rolled steel plate is 150-300mm and the thickness thereof is 0.25-2.70mm. A surface of the rolled steel belt is plated with copper, the plated copper layer having a thickness of 46 m. Either CuSn8P or CuSn10 is selected as the spherical bronze powder to be sintered on the metal base-plate.
Referring to Fig. 1, a method of manufacturing the lead-free self-lubricating sliding bearing according to the invention comprises the following procedures:
A. Select SAEIOIO or SAE1008 brand or SPCC rolled steel belt as the metal base-plate.
B. Sinter on the metal base-plate a laver of lead-free spherical bronze powder, the diameter of the spherical diameter being 60-1401tm, the sintered thickness being 0.25-0.40mm. The sintering furnace is a channel-type sintering furnace using mixed hydrogen-nitrogen as a protective gas, with 50% hydrogen and 50% nitrogen. The sintering lasts 8-10 minutes at 880900 C.
C. Make an extendable soft paste for a friction-reduction and wear-resistant laver:
(1) Perform pohphenylene sulphide chemical cross-linking.
(2) Prepare powder and fibre according to the above-mentioned weight composition. If needed, pigment that can withstand a sintering temperature of up to 400 C may be added to color the lining of the finished bearing.
(3) Stir: mix the prepared powder and fibre and stir them three times, 5-10 minutes each time., to form a mixture. The rotation speed of the stirring machine is 2000-4000r/min. Sieve the mixture three times, with sieve mesh of 100 or more.
(4) Make the extendable soft paste: mix 1000g of the powder mixture with 800g polvtetrafluoroethylene emulsion with 60% solid content: stir for 5-10min in the stirring machine at a rotation speed of 20-60r/min: a preferable environment temperature is 15--25 C.
(5) In order that the soft paste exhibits good fluidity when spread on the sintered layer of spherical bronze powder, 4-6% ethanol should be added when the mixture and the polytetrafluoroethylene emulsion are stirred, so as to make the soft paste even softer.
PCT CN2008 071081 Version: 15 Mav 2009 English translation of the amended application for the Canadian national phase - clean copy D. Automatically spread and roll the soft paste on the bronze powder layer of the two-layer compounded belt on a production line in a way that part of the soft paste penetrates into the pores of the porous layer of spherical bronze powder and a lining layer is formed to cover the spherical powder layer. Preferably the bronze powder is not exposed. Usually. the covering layer is 0.01-0.03mm thick.
but it can be thickened up to 0.21n in if needed.
E. Dry the belt at the temperature of 220-280 C for 15-25 minutes, until the moisture in the pohvtetrafluoroethylene emulsion completely volatilizes.
F. Intermediate rolling: Roll the dried belt once, with a rolling reduction of 0.015--0.03mm, to increase the density of the polytetrafluoroethylene in the pores of the spherical bronze powder layer and the cohesion there-between.
G Sinter the friction-reduction plastic layer in a channel-type nitrogen shield sintering furnace, including three phases, namely, preheating. heating and heat preserving. The sintering heating temperature is 380-390 C. The total sintering time is 15-25 minutes of which 8-10 minutes are for the pre-heating. In order that the belt is not oxidized during the sintering, nitrogen is used in the furnace channel as a protective gas: the purity of the nitrogen is 99.9 /o or above. The minimum flow rate of nitrogen for different sintering furnaces is determined based on that oxidization does not occur.
H. Final rolling: roll the sintered belt into a finished belt in compliance with the requirement of the finished belt. The minimum rolling reduction is 0.02mm or more.
1. Wind up the finished three-layer compounded lead-free self-lubricating belt with a winding machine. Unload it after fixing it by binding.
J. Cut the belt into strips according to bearing specifications. For mass production. unwind the wound three-layer compounded lead-free self-lubricating rolled belt and cut it into strips of a same width or different widths and wind up each strip.
K. Bearing manufacturing: the whole process of manufacturing the three-layer compounded lead-free self-lubricating bearing is completed by forming, on an automatic moulding machine, the stripes into the three-layer compounded lead-free self-lubricating bearing according to bearing requirements. For small scale production where manufacturing on an automatic moulding machine is not suitable. a conventional rolling technique for manufacturing bearings may be adopted:
conventional equipment and working procedure are used to complete the manufacturing process of PCTCN2008 071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy the three-layer compounded lead-free self-lubricating bearing.
According to a practical embodiment of the invention, the following parameters are preferred:
The material composition by weight is 10-20% pol}phenyl thioether superfine powder, 10-20%
aromatic polyester superfine powder, 10-20% aramid fibre with a fibre length of 40 1201un, and 6-10% molybdenum disulphide superfine powder, the rest being polytetrafluoroethelene powder.
For drying, the temperature is 250-280 C and the duration is 15-25 minutes.
Most preferably, the moisture in the PTFE emulsion completely volatilizes.
The sintering is carried out in a nitrogen shield sintering furnace. The sintering temperature is at 380-390 C. The sintering period is 10-20 minutes. The purity of the nitrogen is 99.9% or above.
The flow rate and the pressure of the nitrogen nary in view of different sintering furnaces. Most preferably, oxidation of the steel base-plate does not occur.
but it can be thickened up to 0.21n in if needed.
E. Dry the belt at the temperature of 220-280 C for 15-25 minutes, until the moisture in the pohvtetrafluoroethylene emulsion completely volatilizes.
F. Intermediate rolling: Roll the dried belt once, with a rolling reduction of 0.015--0.03mm, to increase the density of the polytetrafluoroethylene in the pores of the spherical bronze powder layer and the cohesion there-between.
G Sinter the friction-reduction plastic layer in a channel-type nitrogen shield sintering furnace, including three phases, namely, preheating. heating and heat preserving. The sintering heating temperature is 380-390 C. The total sintering time is 15-25 minutes of which 8-10 minutes are for the pre-heating. In order that the belt is not oxidized during the sintering, nitrogen is used in the furnace channel as a protective gas: the purity of the nitrogen is 99.9 /o or above. The minimum flow rate of nitrogen for different sintering furnaces is determined based on that oxidization does not occur.
H. Final rolling: roll the sintered belt into a finished belt in compliance with the requirement of the finished belt. The minimum rolling reduction is 0.02mm or more.
1. Wind up the finished three-layer compounded lead-free self-lubricating belt with a winding machine. Unload it after fixing it by binding.
J. Cut the belt into strips according to bearing specifications. For mass production. unwind the wound three-layer compounded lead-free self-lubricating rolled belt and cut it into strips of a same width or different widths and wind up each strip.
K. Bearing manufacturing: the whole process of manufacturing the three-layer compounded lead-free self-lubricating bearing is completed by forming, on an automatic moulding machine, the stripes into the three-layer compounded lead-free self-lubricating bearing according to bearing requirements. For small scale production where manufacturing on an automatic moulding machine is not suitable. a conventional rolling technique for manufacturing bearings may be adopted:
conventional equipment and working procedure are used to complete the manufacturing process of PCTCN2008 071081 Version: 15 May 2009 English translation of the amended application for the Canadian national phase - clean copy the three-layer compounded lead-free self-lubricating bearing.
According to a practical embodiment of the invention, the following parameters are preferred:
The material composition by weight is 10-20% pol}phenyl thioether superfine powder, 10-20%
aromatic polyester superfine powder, 10-20% aramid fibre with a fibre length of 40 1201un, and 6-10% molybdenum disulphide superfine powder, the rest being polytetrafluoroethelene powder.
For drying, the temperature is 250-280 C and the duration is 15-25 minutes.
Most preferably, the moisture in the PTFE emulsion completely volatilizes.
The sintering is carried out in a nitrogen shield sintering furnace. The sintering temperature is at 380-390 C. The sintering period is 10-20 minutes. The purity of the nitrogen is 99.9% or above.
The flow rate and the pressure of the nitrogen nary in view of different sintering furnaces. Most preferably, oxidation of the steel base-plate does not occur.
Claims (2)
1. A method of manufacturing the lead-free self-lubricating bearing wherein the method comprises:
(a) selecting SAE 1010 or SAE1008 brand or SPCC rolled steel belt as a metal base-plate;
(b) sintering on the metal base-plate a layer of lead-free spherical bronze powder, wherein a diameter of the spherical powder is 60-140µm and a sintered thickness is 0.25-0.40mm;
(c) making an extendable soft paste for the friction-reduction and wear-resistant layer, comprising:
(i) performing polyphenylene sulphide chemical cross-linking;
(ii) preparing powder and fibre according to the composition;
(iii) mixing the prepared powder and fibre and stirring them for at least three times, 5-10 minutes each time, to form a mixture, wherein the stirring is carried out in a stirring machine at a rotation speed of 2000-4000r/min; sieving the mixture at least three times, with sieve mesh of 100 or more;
(iv) making the extendable soft paste by mixing 1000g of the mixture with 800g polytetrafluoroethylene emulsion with 60% solid content and stirring them for 5-10min in a stirring machine at a rotation speed of 20-60r/min, with a preferable environment temperature at 15-25°C;
(v) adding 4-6% ethanol to the mixture and the polytetrafluoroethylene emulsion during the stirring;
(d) automatically spreading and rolling the soft paste on the porous layer of spherical bronze powder on a production line such that part of the soft paste penetrates into pores of the porous layer and a lining layer is formed to cover the spherical powder layer, wherein preferably none spherical bronze powder is exposed, wherein the covering layer has a thickness of 0.01-0.03mm, wherein the thickness may be increased to 0.2mm if needed;
(e) drying the belt at temperature of 220-280°C for 15-25 minutes, until moisture in the polytetrafluoroethylene emulsion completely volatilizes;
(f) intermediate rolling the dried belt once, wherein a rolling reduction is 0.015~0.03mm;
(g) sintering the friction-reduction plastic layer in a channel-type nitrogen shield sintering furnace, including three phases, namely, preheating, beating and heat preserving; wherein the sintering is performed at a heating temperature of 380-390°C with a total period of 15-25 minutes including 8-10 minutes for the pre-heating, wherein nitrogen is used in a furnace channel as a protective gas with a purity of 99.9% or above, wherein a minimum flow rate of nitrogen is determined based on that oxidization does not occur, (h) final rolling the sintered belt into a finished belt in compliance with requirement of a finished belt, wherein a minimum rolling reduction is 0.02mm or more;
(i) winding up the finished three-layer compounded lead-free self-lubricating belt with a winding machine and unload it after fixing it by binding;
(j) cutting the belt into strips according to bearing specifications, wherein for mass production unwinding a wound three-layer compounded, lead-free self-lubricating rolled belt and cutting it into strips of a same width or different widths and winding up each strip;
(k) completing the manufacturing of the bearing by farming, on an automatic moulding machine, the stripes into the three-layer compounded lead-free self-lubricating bearing according to bearing requirements; wherein for small scale production where manufacturing on an automatic moulding machine is not suitable, using a conventional roll-manufacturing technique, conventional equipment and working procedure to complete the manufacturing of the three-layer compounded lead-free self-lubricating bearing.
(a) selecting SAE 1010 or SAE1008 brand or SPCC rolled steel belt as a metal base-plate;
(b) sintering on the metal base-plate a layer of lead-free spherical bronze powder, wherein a diameter of the spherical powder is 60-140µm and a sintered thickness is 0.25-0.40mm;
(c) making an extendable soft paste for the friction-reduction and wear-resistant layer, comprising:
(i) performing polyphenylene sulphide chemical cross-linking;
(ii) preparing powder and fibre according to the composition;
(iii) mixing the prepared powder and fibre and stirring them for at least three times, 5-10 minutes each time, to form a mixture, wherein the stirring is carried out in a stirring machine at a rotation speed of 2000-4000r/min; sieving the mixture at least three times, with sieve mesh of 100 or more;
(iv) making the extendable soft paste by mixing 1000g of the mixture with 800g polytetrafluoroethylene emulsion with 60% solid content and stirring them for 5-10min in a stirring machine at a rotation speed of 20-60r/min, with a preferable environment temperature at 15-25°C;
(v) adding 4-6% ethanol to the mixture and the polytetrafluoroethylene emulsion during the stirring;
(d) automatically spreading and rolling the soft paste on the porous layer of spherical bronze powder on a production line such that part of the soft paste penetrates into pores of the porous layer and a lining layer is formed to cover the spherical powder layer, wherein preferably none spherical bronze powder is exposed, wherein the covering layer has a thickness of 0.01-0.03mm, wherein the thickness may be increased to 0.2mm if needed;
(e) drying the belt at temperature of 220-280°C for 15-25 minutes, until moisture in the polytetrafluoroethylene emulsion completely volatilizes;
(f) intermediate rolling the dried belt once, wherein a rolling reduction is 0.015~0.03mm;
(g) sintering the friction-reduction plastic layer in a channel-type nitrogen shield sintering furnace, including three phases, namely, preheating, beating and heat preserving; wherein the sintering is performed at a heating temperature of 380-390°C with a total period of 15-25 minutes including 8-10 minutes for the pre-heating, wherein nitrogen is used in a furnace channel as a protective gas with a purity of 99.9% or above, wherein a minimum flow rate of nitrogen is determined based on that oxidization does not occur, (h) final rolling the sintered belt into a finished belt in compliance with requirement of a finished belt, wherein a minimum rolling reduction is 0.02mm or more;
(i) winding up the finished three-layer compounded lead-free self-lubricating belt with a winding machine and unload it after fixing it by binding;
(j) cutting the belt into strips according to bearing specifications, wherein for mass production unwinding a wound three-layer compounded, lead-free self-lubricating rolled belt and cutting it into strips of a same width or different widths and winding up each strip;
(k) completing the manufacturing of the bearing by farming, on an automatic moulding machine, the stripes into the three-layer compounded lead-free self-lubricating bearing according to bearing requirements; wherein for small scale production where manufacturing on an automatic moulding machine is not suitable, using a conventional roll-manufacturing technique, conventional equipment and working procedure to complete the manufacturing of the three-layer compounded lead-free self-lubricating bearing.
2. The method of claim 1, wherein the sintering of the lead-free spherical bronze powder on, the metal base-plate further comprises, sintering in a channel-type sintering furnace using mixed hydrogen-nitrogen as a protective gas with 50% hydrogen and 50% nitrogen, wherein the sintering is performed at 880-900°C for 8-10 minutes, and wherein the preparing of the powder and fibre comprises, according to need, adding a pigment that can withstand a sintering temperature of up to 400°C so as to color the lining of the bearing.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710068914.1 | 2007-05-24 | ||
| CN2007100689141A CN101074702B (en) | 2007-05-24 | 2007-05-24 | Lead-free self-lubricating bearing and its production |
| PCT/CN2008/071081 WO2008141592A1 (en) | 2007-05-24 | 2008-05-26 | A lead-free self-lubricating bearing and its producing method |
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| CA2670200A1 CA2670200A1 (en) | 2008-11-27 |
| CA2670200C true CA2670200C (en) | 2011-05-24 |
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| CA2670200A Active CA2670200C (en) | 2007-05-24 | 2008-05-26 | A lead-free self-lubricating bearing and its producing method |
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| CN (1) | CN101074702B (en) |
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| CN101074702B (en) * | 2007-05-24 | 2012-03-28 | 浙江长盛滑动轴承股份有限公司 | Lead-free self-lubricating bearing and its production |
| CN101851420A (en) * | 2010-05-07 | 2010-10-06 | 李敏 | Organic material capable of improving friction performance by forming transfer membrane in friction |
| CN102226482A (en) * | 2011-04-21 | 2011-10-26 | 浙江新三荣制冷有限公司 | Piston four-way reversing valve for refrigerating system |
| CN102338162B (en) * | 2011-09-14 | 2013-01-16 | 上海市塑料研究所 | Preparation method for metal-based polytetrafluoroethylene bearing |
| CN102553806B (en) * | 2011-12-27 | 2014-03-12 | 上海英格索兰压缩机有限公司 | Anticorrosive coating spraying process for dry screw compressor |
| US8850655B2 (en) * | 2012-02-28 | 2014-10-07 | General Electric Company | Bronze bushing and wear surface |
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| ITBG20120051A1 (en) | 2012-10-31 | 2014-05-01 | Technymon Srl | DEVICE FOR THE STORAGE OF A UNIFORM LAYER OF POWDER ON A METAL TAPE |
| CN103291763A (en) * | 2013-05-24 | 2013-09-11 | 哈尔滨汽轮机厂有限责任公司 | Application of self-lubricating coating on steam turbine bearing box base |
| WO2014205915A1 (en) * | 2013-06-26 | 2014-12-31 | 浙江长盛滑动轴承股份有限公司 | Metal matrix self-lubricating composite and manufacturing method therefor |
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| CN104148633B (en) * | 2014-08-20 | 2016-10-26 | 韩建 | A kind of sliding bearing sheet material sintering method and the support for the method |
| CN105650120A (en) * | 2016-04-12 | 2016-06-08 | 浙江长盛滑动轴承股份有限公司 | Integrated type metal-base three-layered composite self-lubricating bearing and manufacturing method thereof |
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| JP4565934B2 (en) * | 2004-08-30 | 2010-10-20 | オイレス工業株式会社 | Multi-layer sliding member |
| CN1912410A (en) * | 2006-07-31 | 2007-02-14 | 大连三环复合材料技术开发有限公司 | High temp resistance self-lubricating bearing and manufacturing method |
| CN101074702B (en) * | 2007-05-24 | 2012-03-28 | 浙江长盛滑动轴承股份有限公司 | Lead-free self-lubricating bearing and its production |
-
2007
- 2007-05-24 CN CN2007100689141A patent/CN101074702B/en active Active
-
2008
- 2008-05-26 CA CA2670200A patent/CA2670200C/en active Active
- 2008-05-26 WO PCT/CN2008/071081 patent/WO2008141592A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008141592A1 (en) | 2008-11-27 |
| CA2670200A1 (en) | 2008-11-27 |
| CN101074702A (en) | 2007-11-21 |
| CN101074702B (en) | 2012-03-28 |
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