CN102338162B - Preparation method for metal-based polytetrafluoroethylene bearing - Google Patents
Preparation method for metal-based polytetrafluoroethylene bearing Download PDFInfo
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- CN102338162B CN102338162B CN 201110269809 CN201110269809A CN102338162B CN 102338162 B CN102338162 B CN 102338162B CN 201110269809 CN201110269809 CN 201110269809 CN 201110269809 A CN201110269809 A CN 201110269809A CN 102338162 B CN102338162 B CN 102338162B
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Abstract
The invention relates to a preparation method for a metal-based polytetrafluoroethylene bearing. The method comprises the following steps of: (1) machining a metal blank; (2) performing sand blasting; (3) spray-coating a meltable fluororesin coating; (4) covering a polytetrafluoroethylene film; (5) covering a glass tape; (6) sintering; and (7) machining a finished product. By adopting the method, since the meltable fluororesin coating is additionally arranged between the polytetrafluoroethylene layer and metal, stripping strength between the polytetrafluoroethylene layer and metal is increased; the polytetrafluoroethylene layer and metal layer are compounded together through high temperature; a formula of polytetrafluoroethylene is not limited and can be adjusted with high flexibility according to actual requirements; the type of the metal adopted by the bearing can be expanded, namely the metal can be a tough metal material, and can also be a friable metal material; and finally, the prepared metal-based polytetrafluoroethylene bearing does not have a weld joint or a connection point, the dimensional accuracy can be accurately controlled, and the high-accuracy requirements of aerospace and military machinery on dimension are met.
Description
Technical field
The invention belongs to the fluoroplastic processing technique field, be specifically related to a kind of preparation method of metal-based polytetrafluoroethylbearing bearing.
Background technique
The metal-based polytetrafluoroethylbearing material as self lubricating material, combines the advantage of metal and teflon, has that mechanical strength is high, good heat conductivity, thermal expansion coefficient is little, friction factor is low, wear-resisting property is good and the characteristics of serviceability temperature wide ranges.The made bearing of this material is widely used in the fields such as food, medical treatment, Aero-Space, boats and ships.
Publication number CN 101074702A Chinese patent discloses preparation and has had the method for the metal-based polytetrafluoroethylbearing self oiling bearing of three-decker, and this patent has been described such three-decker, metal layer, sintered bronze bisque, filled polytetrafluoroethylene layer.The bearing that adopts the method preparation is to form through flat board is curling, has limited the kind of the metal that adopts, and there is weld seam in final resulting bearing, and can not prepare and have the comparatively bearing of labyrinth; The teflon prescription that adopts when in addition, adopting the method to prepare bearing also is subject to certain restrictions.
Publication number CN 1190618A Chinese patent discloses the method for preparing metal and polytetrafluoroethylmaterial material by bonding process, be coated with 1 at film or tabular PTFE, 1-diffusivity and perfluoropropene compound and polytetrafluoroethylene teflon soliquoid carry out sintering, then be bonded to and carried out on the surface-treated metallic material, compound in 170 ~ 190 ℃ of lower hot pressing.There is apparent in view lapping defect in bearing surface teflon by the method preparation, and serviceability temperature is subject to the impact of Bond vinylidene fluoride and perfluoropropene compound, and serviceability temperature can not be higher than 120 ℃ for a long time.
Summary of the invention
For overcoming above deficiency, the object of the present invention is to provide the preparation method of a kind of no-welding-seam, gapless, the metal-based polytetrafluoroethylbearing bearing that high temperature resistant, adhesion strength improves.
Technological scheme of the present invention is achieved in the following ways: the preparation method of metal-based polytetrafluoroethylbearing bearing may further comprise the steps:
1) machining of metal blank: the metal blank of requirement material is carried out machining, the two ends of described metal blank are baffle plate, the middle part needs to coat poly tetrafluoroethylene, the zone that needs are coated poly tetrafluoroethylene is refined to and requires size, and other parts are reserved the 2-3mm size surplus;
2) sandblast: adopt the high-pressure sand blast air gun will coat the regional hacking alligatoring of poly tetrafluoroethylene, then purge its surface clean with clean air;
3) spraying fusibility fluor resin coating: coating the zone spraying single or multiple lift fusibility resinous coat of poly tetrafluoroethylene, and carrying out sintering;
4) coat poly tetrafluoroethylene: coat poly tetrafluoroethylene at the metal position that requires to have polytetrafluoroethylene floor;
5) coat glass tape: at polytetrafluoroethylene floor outer cladding glass tape, the glass tape width is 2-4cm;
6) sintering:
7) finished product machine processing: process by the requirement of goods final size.
The sand particle size of the high-pressure sand blast air gun that adopts among the present invention, step 2) is 0.3-1.0mm.
Among the present invention, the single or multiple lift fusibility resinous coat that sprays in the step 3) adopts perfluoro alkoxy-fluoropolymer, and it need satisfy total thickness is 0.05-0.15mm.
Among the present invention, sintering temperature is 340-380 ℃ in the step 3), and holding time is 20-40min.
Among the present invention, poly tetrafluoroethylene described in the step 4) is the Teflon turning film, and described Teflon turning film can be for filling or non-filled polytetrafluoroethylene turning film, and every strata tetrafluoroethylene turning film thickness is 0.05-0.3mm; The total thickness that coats the turning film is 1-5mm.
Among the present invention, sintering temperature is 360-390 ℃ in the step 6), and holding time is 2-6h.
Among the present invention, adopt the compound method of poly tetrafluoroethylene and metallic material, and between added fusible fluoroplastic, increased both cohesive forces, peeling strength is improved; Moreover, the prescription of teflon membrane material can be selected according to actual service conditions, flexibility is strong, because metallic material is directly formed by the direct machining of blank, without crooked welding procedure, therefore employed metal can be toughness or brittle metal material, the metal internal stress is little, no-welding-seam, precision is high, long service life; Bonding between teflon and the metal has adopted the thermostable fluorine plastics, and long-term serviceability temperature can reach 200 ℃; In addition, prepare the metal-based polytetrafluoroethylbearing material with tradition and compare, the involved equipment of the method is simple, and the one-time investment cost is low.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Fig. 2 is the schematic diagram after the metal blank machining.
Fig. 3 is for coating the glass tape schematic diagram.
Fig. 4 is the end article sectional drawing.
Number in the figure: 1 is baffle plate, and 2 are metal blank processing baseline, and 3 for needing to coat the zone of poly tetrafluoroethylene, and 4 is glass tape, and 5 is the metal blank matrix, and 6 is interface layer, and 7 is polytetrafluoroethylene floor, and 8 is the hollow shaft sleeve axle center.
Embodiment
The present invention is described in more detail below in conjunction with drawings and Examples.
Embodiment 1: the lubricated bronze basic teflon bearing of preparation high speed water, and serviceability temperature is 120 ℃, bearing rotating speed 8000r/min, working medium are boiler water, work water pressure 1.2-1.5MPa.
1) bronze blank is machined to Fig. 2 shape, wherein 1 is baffle plate, stop teflon to overflow because of expansion during sintering, and be machining benchmark, 2 are metal blank processing baseline, belong to non-processing district, 3 for coating the zone of poly tetrafluoroethylene, belongs to the processing district, and this section need carry out sandblast, the operations such as spraying fusibility fluor resin coating and coating poly tetrafluoroethylene, the concrete technology parameter request is different according to final products;
2) grains of sand about adopting the high-pressure sand blast air gun with particle diameter 0.5mm are injected in and need to coat on the zone of poly tetrafluoroethylene, with its hacking alligatoring, note the protection of metal blank processing baseline during sandblast; Adopt cleaning compressed air that the metal blank body regions is purged after the hacking alligatoring clean;
3) need after sandblast coat the teflon diaphragm area and spray perfluoro alkoxy-fluoropolymer (PFA), and at 360 ℃ of lower sintering 30min, the PFA coating thickness is about 0.05mm;
4) need after spraying coat the teflon diaphragm area and coat poly tetrafluoroethylene, and this poly tetrafluoroethylene is that the 10% molybdenum disulfide-filled sintering polytetrafluoroethylene blank turning of 15% carbon fiber forms, and monofilm thickness is 0.2mm, and the total thickness of coating is 2mm;
5) Fig. 3 coat glass tape in metal blank processing baseline and the mode that needs coating teflon diaphragm area with winding, and the glass tape width is 3mm, and area coverage is about 50% between lower floor's glass tape and the upper strata glass tape;
6) goods are put sintering furnace in the step 5), with 375 ℃ of lower sintering 3h, cool off in the sintering furnace;
7) machining steps 6) goods are to requiring shape and size.
The gained end article has cross section such as Fig. 4 of teflon layer segment, comprises bronze matrix 5, interface layer 6 and polytetrafluoroethylene floor 7.The basic teflon bearing of prepared bronze service life 1000h under above-mentioned working condition, running is stable, and the surface is intact, and wear extent is few.
Claims (6)
1. the preparation method of a metal-based polytetrafluoroethylbearing bearing is characterized in that concrete steps are as follows:
(1) machining of metal blank: the metal blank of requirement material is carried out machining, the two ends of described metal blank are baffle plate, the middle part needs to coat poly tetrafluoroethylene, the zone that needs are coated poly tetrafluoroethylene is refined to and requires size, and other parts are reserved the 2-3mm size surplus;
(2) sandblast: adopt the high-pressure sand blast air gun will coat the regional hacking alligatoring of poly tetrafluoroethylene, then purge its surface clean with clean air;
(3) spraying fusibility fluor resin coating: coat the zone spraying single or multiple lift fusibility fluor resin coating of poly tetrafluoroethylene at need, and carry out sintering;
(4) coat poly tetrafluoroethylene: coat poly tetrafluoroethylene at the metal position that requires to have polytetrafluoroethylene floor;
(5) coat glass tape: at polytetrafluoroethylene floor outer cladding glass tape, the glass tape width is 2-4cm;
(6) sintering;
(7) finished product machine processing: process by the requirement of goods final size.
2. preparation method according to claim 1 is characterized in that the sand particle size of the high-pressure sand blast air gun that adopts in the step (2) is 0.3-1.0mm.
3. preparation method according to claim 1 is characterized in that single or multiple lift fusibility fluor resin coating adopts perfluoro alkoxy-fluoropolymer in the step (3), and its total thickness is 0.05-0.15mm.
4. preparation method according to claim 1 is characterized in that sintering temperature is 340-380 ℃ in the step (3), and holding time is 20-40min.
5. preparation method according to claim 1, it is characterized in that poly tetrafluoroethylene is the Teflon turning film described in the step (4), described Teflon turning film is for filling or non-filled polytetrafluoroethylene turning film, and every strata tetrafluoroethylene turning film thickness is 0.05-0.3mm; The total thickness that coats the turning film is 1-5mm.
6. preparation method according to claim 1 is characterized in that sintering temperature is 360-390 ℃ in the step (6), and holding time is 2-6h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110269809 CN102338162B (en) | 2011-09-14 | 2011-09-14 | Preparation method for metal-based polytetrafluoroethylene bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110269809 CN102338162B (en) | 2011-09-14 | 2011-09-14 | Preparation method for metal-based polytetrafluoroethylene bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102338162A CN102338162A (en) | 2012-02-01 |
| CN102338162B true CN102338162B (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110269809 Expired - Fee Related CN102338162B (en) | 2011-09-14 | 2011-09-14 | Preparation method for metal-based polytetrafluoroethylene bearing |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103527633B (en) * | 2013-10-30 | 2016-06-22 | 长沙精达高分子材料有限公司 | A kind of self-lubricating composite guide bearing and production method thereof and application |
| CN104174572A (en) * | 2014-08-06 | 2014-12-03 | 南京正源搪瓷设备制造有限公司 | Production method for workpiece with externally lined fluorine |
| DE102017105304B3 (en) * | 2017-03-13 | 2018-04-12 | Ks Gleitlager Gmbh | Slide bearing element, intermediate in the production of a sliding bearing element and method for their preparation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2984599A (en) * | 1956-06-29 | 1961-05-16 | George D Edwards | Process for bonding teflon sheet to prepared surfaces |
| US3421972A (en) * | 1965-06-28 | 1969-01-14 | Koppers Co Inc | Process for directly bonding polytetrafluoroethylene to metal,adhesive composition used therefor and laminated product thereof |
| US3799832A (en) * | 1971-12-06 | 1974-03-26 | F Reick | Technique for bonding tetrafluoroethylene sheet to metal substrate |
| JPS57100134A (en) * | 1980-12-15 | 1982-06-22 | Oiles Ind Co Ltd | Manufacturing of synthetic resin sliding member having low frictional sliding surface layer on inner wall surface |
| IT1285771B1 (en) * | 1996-10-04 | 1998-06-18 | Ausimont Spa | COUPLED PIFE WITH SUBSTRATES |
| 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 |
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Owner name: SHANGHAI PLASTIC RESEARCH INSTITUTE CO., LTD. Free format text: FORMER NAME: SHANGHAI PLASTIC INST. |
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Address after: Qingpu District Xujing town Shanghai city 201702 West Zhu Lu Road No. 1251 Patentee after: Co., Ltd of Shanghai Plastic Inst. Address before: 200092 Shanghai city Yangpu District Yangshupu Road No. 1664 Patentee before: Shanghai Plastic Inst. |
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