CN1240766C - Filling up Teflon friction ring and its preparing method - Google Patents
Filling up Teflon friction ring and its preparing method Download PDFInfo
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- CN1240766C CN1240766C CN 03113558 CN03113558A CN1240766C CN 1240766 C CN1240766 C CN 1240766C CN 03113558 CN03113558 CN 03113558 CN 03113558 A CN03113558 A CN 03113558A CN 1240766 C CN1240766 C CN 1240766C
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Abstract
The present invention provides a friction ring filled with polytetrafluoroethylene, which comprises the components of the following proportion: 100 parts by weight of polytetrafluoroethylene pure material, 1 to 10 parts by weight of graphite, 20 to 50 parts by weight of carbon black, 0 to 30 parts by weight of 20 to 50 and 0 to 5 parts by weight of molybdenum disulfide. The making process of the friction ring filled with polytetrafluoroethylene comprises: material mixing, moulding, sintering and mechanical processing, wherein a moulding process comprises the steps of material adding, pressurization, pressure maintenance, pressure relief and demoulding. Exerted pressure is from 40 to 70MPa. Pressurization speed is from 5 to 15 mm/min. Pressure maintenance time is from 5 to 40 minutes. The friction ring filled with polytetrafluoroethylene, which is made by the making process, can be directly used under the operation condition without oil lubrication, and the abrasion of a matching abrasion surface can be reduced. The service life of the friction ring is enhanced.
Description
Technical field
The present invention relates to the friction ring technology, particularly a kind of filled polytetrafluoroethylene friction ring and manufacturing process and application.
Background technology
At present, the manufacturing processed of known filled polytetrafluoroethylene friction ring comprises processing steps such as batch mixing, mold pressing, sintering, mechanical workout; Batch mixing is meant the pure material of tetrafluoroethylene is mixed by certain proportioning with various filling-modified materials, makes the PTFE stopping composition; Mold pressing is meant the PTFE stopping composition is placed in the mould, controls processing parameters such as its mould structure, pressure, dwell time, compression rate, by certain reinforced-pressurization-pressurize-release-demoulding program, makes the mold pressing work in-process; Sintering is meant the mold pressing work in-process are placed in the sinter box, controls processing parameters such as its sintering temperature, temperature rise rate, soaking time, rate of temperature fall, placement form, by certain intensification-insulation-cooling process, makes the sintering work in-process; Mechanical workout is meant the sintering work in-process is carried out the size finishing by the method for mechanical workout, thereby obtains filled polytetrafluoroethylene friction ring finished product.
The filling-modified material of tetrafluoroethylene has bronze powder, graphite, molybdenumdisulphide, glass fibre, carbon fiber, carbon black etc. usually, at present, known filled polytetrafluoroethylene friction ring material contains metallic substance such as bronze powder usually, add the proportioning difference of other filling-modified material, when the friction ring of making uses under the oil-free lubricatoin condition, cause the life-span of the damage of match grinding face or friction ring too short easily; The mold pressing of known filled polytetrafluoroethylene friction ring, sintering process, it is unreasonable to exist mould structure to some extent, the selection of processing parameters such as pressure, dwell time, compression rate, sintering temperature, temperature rise rate, soaking time, rate of temperature fall is improper, sintering is placed problems such as form is unreasonable, thereby cause defectives such as mold pressing/sintering cracking, work in-process are out of shape, compactness extent is inconsistent easily, and then it is not high to have influence on material use efficiency, when the friction ring product uses, of low quality or unstable when especially under the oil-free lubricatoin condition, using; In addition, when the filled polytetrafluoroethylene friction ring used under the oil-free lubricatoin condition, the unreasonable of its product structure also can cause the life-span of friction ring too short.
Summary of the invention
When the objective of the invention is to overcome existing filled polytetrafluoroethylene friction ring and under the oil-free lubricatoin condition, using, cause the damage of match grinding face or the too short shortcoming of life-span of friction ring easily, a kind of wearing and tearing that can lower the match grinding face are provided, improve the filled polytetrafluoroethylene friction ring in work-ing life.
Another object of the present invention is to provide a kind of the improved material use efficiency of above-mentioned filled polytetrafluoroethylene friction ring and manufacturing process of quality product of preparing.
A further object of the present invention is to provide a kind of application of above-mentioned filled polytetrafluoroethylene friction ring.
Purpose of the present invention is achieved through the following technical solutions: the composition of this filled polytetrafluoroethylene friction ring and proportioning be---
The pure material of tetrafluoroethylene: 100
Graphite: 1～10
Carbon black: 20～50
Glass fibre: 0～30
Molybdenumdisulphide: 0～5
Above-mentioned each proportion of composing is weight percentage.
A kind of manufacturing process for preparing above-mentioned filled polytetrafluoroethylene friction ring, comprise technological processs such as batch mixing, mold pressing, sintering, mechanical workout, it is characterized in that: described mold process comprises operation stepss such as reinforced, pressurization, pressurize, release, the demoulding, described applied pressure is 40～70MPa, press oil cylinder fall off rate is 5～15mm/min during pressurization, and the dwell time is 5～40min.
Be the influence of the frictional force that reduces PTFE stopping composition and die surface to the resistant function of clamp force, usually to adopt the method for two-way pressurization: as shown in Figure 1, pressure cylinder 7 under increasing on the general compacting tool set, following pressure cylinder 7 is not worked earlier, and adopt external mold 4, core 2, following pressure ring 6, filler 5 are installed, load onto pressure ring 3, go up pressure cylinder 1, when being pressurized to the pressure of required clamp force about 1/3, release, unclamp, load onto down pressure cylinder 7 then, be pressurized to required clamp force again, pressurize, release, depanning.In addition, the mold cavity surface of external mold 4, core 2 is answered chromium plating or is processed with stainless steel precision usually, and for reducing the friction of PTFE stopping composition and die surface as far as possible, methods such as needs use grinding are with mold cavity surface polishing.
Common increase along with friction ring blank axial projection area, the frictional force of PTFE stopping composition and die surface reduces the resistant function power of clamp force thereupon gradually, for reducing blank easy rimose influence when the high pressure, thereby reduce clamp force along with the increase of friction ring blank axial projection area, specifically as shown in Figure 2.
Described sintering process as shown in Figure 3, its program and processing parameter be---
(1) heats up; Its speed is 12～50 ℃/h;
(2) insulation one; When temperature was 327～330 ℃, soaking time was 0.5～4h;
(3) heat up; Its speed is 12～50 ℃/h;
(4) insulation two; When temperature was 360～380 ℃, soaking time was 1～10h;
(5) cooling; Its speed is 10～40 ℃/h;
(6) insulation three: when temperature was 320-327 ℃, soaking time was 0.5～4h;
When (7) being cooled to below 260 ℃, naturally cool to room temperature.
Increase with the blank axial height increases because the frictional force of PTFE mobility of filler difference and PTFE stopping composition and die surface is to the resistant function power of clamp force, for eliminating the influence of above-mentioned factor, should increase the dwell time with the axial increase of height blank, specifically as shown in Figure 4.
Described sintering process is for the blank of different size, its operation is also different: for the blank of external diameter greater than 400mm, blank needn't break away from core after the mold pressing, but be enclosed within on the core, lie in the interior sintering of sinter box (stove), and carry out aftertreatment, described aftertreatment is: the blank of depoling behind the sintering is put into sinter box (stove) again be warming up to 250 ℃～290 ℃ insulation 1～5h, naturally cool to room temperature then; For the blank of external diameter, directly the blank after the mold pressing demoulding is lain in the interior sintering of sinter box (stove) and do not carry out aftertreatment less than 400mm.
Can be applicable to the operational condition of oil-free lubricatoin by this filled polytetrafluoroethylene friction ring of above-mentioned technological process preparation.
The present invention has following advantage with respect to prior art and produces effect: when this filled polytetrafluoroethylene friction ring uses under the oil-free lubricatoin condition, because the selection of material mixture ratio is proper, make friction ring have suitable intensity and hardness, keep good self lubricity and thermal conductivity, thereby can lower the wearing and tearing of match grinding face, on the other hand, because the suitable selection of mold pressing and sintering process, make friction ring material inside organization compactness, good uniformity, friction ring has good anti-cold flow properties and wear resistance, thereby improves the life-span of friction ring.
Description of drawings
Fig. 1 is the structural representation of the used compacting tool set of the present invention.
Fig. 2 be among the present invention pressure and friction ring blank axial projective area concern selection figure.
Fig. 3 is time one a temperature program(me) control chart in the sintering process among the present invention.
Fig. 4 be among the present invention dwell time and friction ring blank axial height concern selection figure.
Fig. 5 is the structural representation of filled polytetrafluoroethylene friction ring of the present invention.
Fig. 6 is the axial view of filled polytetrafluoroethylene friction ring shown in Figure 5.
Fig. 7 is the circumferentially deploying figure of filled polytetrafluoroethylene friction ring shown in Figure 5.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing, but embodiments of the present invention are not limited thereto.
Embodiment 1
This filled polytetrafluoroethylene friction ring is a used friction ring of the reciprocating type oil free compressor of 4MPa level, and concrete applying working condition is as follows: cylinder diameter: 90mm, pressure: 4MPa, stroke: 180mm, use temperature :≤180 ℃, medium: air, reciprocating frequence: 585min
-1The concrete structure of this filled polytetrafluoroethylene friction ring such as Fig. 5～shown in Figure 7, by Fig. 5～Fig. 7 as seen, cylindrical and end face at friction ring process the shallow slot angled with cylinder axis, this groove works to lower the friction ring thrust load, the moment of torsion that lambdoid shallow slot can make axial force form is cancelled each other, under the torsional interaction that forms owing to diagonal cut joint, this friction ring can slowly rotate along circumferential, thereby reaches the purpose of uniform wear.
The type selecting of this filled polytetrafluoroethylene friction ring, composition and proportioning be---
The tetrafluoroethylene type selecting: but flow model;
The pure material of tetrafluoroethylene: 100
Graphite: 5
Carbon black: 45
Above-mentioned each proportion of composing is weight percentage.
Mold pressing program and processing parameter thereof---
Mold pressing program: reinforced-pressurization-pressurize-release-demoulding;
Mould structure: see Fig. 1, wherein each member name is called: go up pressure cylinder 1, core rod 2, upper press ring 3, external mold 4, blank 5, following pressure ring 6, following pressure cylinder 7;
Blank axial projective area: 2640mm
2
Blank axial height: 27mm;
Pressure: 50MPa;
Compression rate: 10mm/min;
Dwell time: 5min.
Sintering program and processing parameter thereof---
Temperature rise rate: 50 ℃/h
Be incubated one: 330 ℃
Soaking time 1:1h
Be incubated two: 375 ℃
Soaking time 2:3h
Rate of temperature fall: 40 ℃/h
Be incubated three: 320 ℃
Soaking time 3:1h
Placement form: lie in the sinter box (stove)
Because the proportional sizes of this friction ring is little, need not overlap the core sintering, therefore without aftertreatment.
Claims (6)
1, a kind of filled polytetrafluoroethylene friction ring is characterized in that its composition and proportioning are:
The pure material of tetrafluoroethylene: 100
Graphite: 1～10
Carbon black: 20～50
Glass fibre: 0～30
Molybdenumdisulphide: 0～5
Above-mentioned each proportion of composing is weight percentage;
Its manufacturing process comprises batch mixing, mold pressing, sintering, mechanical workout, prepares burden by aforementioned component and proportioning before the batch mixing; That described mold process comprises is reinforced, pressurization, pressurize, release, demoulding step, and described applied pressure is 40～70MPa, and press oil cylinder fall off rate is 5～15mm/min during pressurization, and the dwell time is 5～40min; The program of described sintering process and processing parameter are
(1) heats up; Its speed is 12～50 ℃/h;
(2) insulation one; When temperature was 327～330 ℃, soaking time was 0.5～4h;
(3) heat up; Its speed is 12～50 ℃/h;
(4) insulation two; When temperature was 360～380 ℃, soaking time was 1～10h;
(5) cooling; Its speed is 10～40 ℃/h;
(6) insulation three: when temperature was 320-327 ℃, soaking time was 0.5～4h;
When (7) being cooled to below 260 ℃, naturally cool to room temperature.
2, the manufacturing process of filled polytetrafluoroethylene friction ring according to claim 1 comprises batch mixing, mold pressing, sintering, mechanical workout, it is characterized in that: prepare burden by described component of claim 1 and proportioning before the batch mixing; That described mold process comprises is reinforced, pressurization, pressurize, release, demoulding step, and described applied pressure is 40～70MPa, and press oil cylinder fall off rate is 5～15mm/min during pressurization, and the dwell time is 5～40min; The program of described sintering process and processing parameter are
(1) heats up; Its speed is 12～50 ℃/h;
(2) insulation one; When temperature was 327～330 ℃, soaking time was 0.5～4h;
(3) heat up; Its speed is 12～50 ℃/h;
(4) insulation two; When temperature was 360～380 ℃, soaking time was 1～10h;
(5) cooling; Its speed is 10～40 ℃/h;
(6) insulation three: when temperature was 320-327 ℃, soaking time was 0.5～4h;
When (7) being cooled to below 260 ℃, naturally cool to room temperature.
3, the manufacturing process of filled polytetrafluoroethylene friction ring according to claim 2 is characterized in that: described pressurization steps adopts two-way pressing mode.
4, the manufacturing process of filled polytetrafluoroethylene friction ring according to claim 3 is characterized in that: reduce institute's applied pressure along with the increase of friction ring blank axial projection area.
5, the manufacturing process of filled polytetrafluoroethylene friction ring according to claim 2, it is characterized in that: for the blank of external diameter greater than 400mm, blank needn't break away from core after the mold pressing, but be enclosed within on the core, lie in sintering in sinter box/sintering oven, and carry out aftertreatment, described aftertreatment is: the blank of depoling behind the sintering is put into sinter box/sintering oven again be warming up to 250 ℃～290 ℃ insulation 1～5h, naturally cool to room temperature then; For the blank of external diameter, directly the blank after the mold pressing demoulding is lain in sintering in sinter box/sintering oven and do not carry out aftertreatment less than 400mm.
6, the application of filled polytetrafluoroethylene friction ring according to claim 1 is characterized in that: the operational condition that directly is used in oil-free lubricatoin.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03113558 CN1240766C (en) | 2003-01-14 | 2003-01-14 | Filling up Teflon friction ring and its preparing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 03113558 CN1240766C (en) | 2003-01-14 | 2003-01-14 | Filling up Teflon friction ring and its preparing method |
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| CN1431249A CN1431249A (en) | 2003-07-23 |
| CN1240766C true CN1240766C (en) | 2006-02-08 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100389163C (en) * | 2006-04-21 | 2008-05-21 | 兰州理工大学 | Polytetrafluoroethylene sealing ring material and its preparation method |
| CN101935517A (en) * | 2009-06-30 | 2011-01-05 | 陈仕明 | Polytetrafluoroethylene friction piece |
| CN101991229B (en) * | 2010-11-01 | 2012-01-25 | 孙海云 | Dampproof and air-permeable sole and preparation method thereof |
| CN102182826B (en) * | 2010-12-24 | 2015-11-25 | 广东新志密封技术有限公司 | A kind of processing method of modified Teflon seal ring |
| JP5782897B2 (en) * | 2011-07-26 | 2015-09-24 | ダイキン工業株式会社 | Method for producing polytetrafluoroethylene molded product, method for producing polytetrafluoroethylene sheet |
| CN102875941B (en) * | 2012-09-26 | 2014-12-24 | 广州机械科学研究院有限公司 | Polytetrafluoroethylene sealing material for highly wear-resistant oil cylinder, method for preparing polytetrafluoroethylene sealing material and application of polytetrafluoroethylene sealing material |
| CN105802105A (en) * | 2016-04-08 | 2016-07-27 | 章俊 | Wear-resistant nano-plastic and preparation method thereof |
| CN105864329A (en) * | 2016-04-28 | 2016-08-17 | 湖北三江航天江北机械工程有限公司 | Differential friction plate for double-twisting machine and machining method of differential friction plate |
| CN108591018B (en) * | 2018-04-25 | 2019-09-10 | 河南省沪鑫实业有限公司 | Oilless air compressor piston bushing and its processing method |
| CN109486069A (en) * | 2018-12-18 | 2019-03-19 | 南京肯特复合材料股份有限公司 | Wear-resisting PTFE composite and preparation method thereof |
| CN110079037B (en) * | 2019-04-26 | 2021-09-24 | 广东欧特派环保材料科技有限公司 | Self-lubricating wear-resistant PTFE composite material and preparation method thereof |
| CN111637228A (en) * | 2020-05-29 | 2020-09-08 | 成都凯天电子股份有限公司 | Mechanical seal static friction ring material for cryogenic pump |
| CN112940415B (en) * | 2021-02-04 | 2023-08-11 | 上海材料研究所有限公司 | Polytetrafluoroethylene composite material and preparation method thereof |
| CN114043659A (en) * | 2021-11-29 | 2022-02-15 | 杭州麦克密封材料有限公司 | Production process of multipurpose sealed graphite tetrafluoro soft belt |
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Owner name: GUANGZHOU BAOLITE HYDRAULIC SEALING CO., LTD. Free format text: FORMER OWNER: GUANGZHOU INST. OF MACHINERY SCIENCE Effective date: 20081031 |
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Effective date of registration: 20081031 Address after: No. 828 Mao Mao Road, Whampoa District, Guangdong, Guangzhou Patentee after: Guangzhou BLT Hydraulics & Seals Ltd. Address before: No. 828 Mao Mao Road, Whampoa District, Guangdong, Guangzhou Patentee before: Guangzhou Mechanical Engineering Research Institute |
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Granted publication date: 20060208 Termination date: 20140114 |