CN1544231A - Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die - Google Patents
Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die Download PDFInfo
- Publication number
- CN1544231A CN1544231A CNA2003101154583A CN200310115458A CN1544231A CN 1544231 A CN1544231 A CN 1544231A CN A2003101154583 A CNA2003101154583 A CN A2003101154583A CN 200310115458 A CN200310115458 A CN 200310115458A CN 1544231 A CN1544231 A CN 1544231A
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- ptfe
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- formpiston
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims description 53
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims description 53
- -1 polytetrafluoroethylene Polymers 0.000 title claims description 18
- 238000007723 die pressing method Methods 0.000 title 1
- 238000000465 moulding Methods 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000000843 powder Substances 0.000 claims abstract description 13
- 238000003825 pressing Methods 0.000 claims description 13
- 238000000748 compression moulding Methods 0.000 claims description 9
- 229920001971 elastomer Polymers 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000000806 elastomer Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000007789 sealing Methods 0.000 abstract description 10
- 239000007788 liquid Substances 0.000 abstract description 4
- 238000001721 transfer moulding Methods 0.000 abstract description 2
- 239000004809 Teflon Substances 0.000 abstract 4
- 229920006362 Teflon® Polymers 0.000 abstract 4
- 230000007547 defect Effects 0.000 abstract 1
- 239000000047 product Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 3
- 238000012797 qualification Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009747 press moulding Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention is a soft mode die forming method of teflon thin-wall shell product, using a definitely elastic soft mode to regulate and transfer molding pressure between a rigid mould and teflon powder, thus able to primely remedy inevitable nonuniformity during charging materials of teflon special-shaped pieces, overcoming the defect in molding teflon thin-wall shell products, radically improving product quality and yield, and unnecessary to add any new devices, liquid mediums and sealing bags.
Description
Technical field
The present invention relates to a kind of soft mode compression-moulding methods, relate in particular to the soft mode compression-moulding methods of a kind of polytetrafluoroethylene (PTFE) (being called for short PTFE) thin-walled shell goods.
Background technology
At present, be to pour the polytetrafluoroethylene (PTFE) mould pressing powder into the rigidity die cavity for the general compression molding method of polytetrafluoroethylene (PTFE) thin-walled shell goods, suppress.The rigidity cavity dimension is usually by product size and the design of material compression ratio, but the part with complicated structure brings great difficulty but for cavity design and stocking process.Because forming materials is mobile poor, whether pressure distribution evenly can not be by the flow adjustment of material in the pressing process, can only lean on the uniformity of charging to guarantee, therefore conventional mould pressing method can not be regulated in the die cavity goods distribution and the size of pressure everywhere, very easily cause the goods internal stress, produce micro-crack, little distortion and the unsettled defective of size, cause the instability of product molding quality, the problem that waste is big, efficient is low and yield rate is low.
In order to solve the defective of polytetrafluoroethylene (PTFE) pressing, adopt hydroform method usually, can be divided into interior hydraulic method, outer hydraulic method again.Interior hydraulic method is with high-pressure pump liquid to be injected the good sealing bag of sealing property, and suppress the polytetrafluoroethylene (PTFE) powder in the hyperbaric chamber that utilizes sealing bag and rigidity former to constitute; Outer hydraulic pressure rule is that the good sealing bag of sealing property is encased polytetrafluoroethylene powder and rigidity formpiston, drops into then in the hydroclave, injects highly pressurised liquid in hydroclave, and sealing bag and formpiston constitute the hyperbaric chamber to be suppressed polytetrafluoroethylene (PTFE) powder wherein.The polytetrafluoroethylproducts products pressurized of hydraulic method moulding is even, dimensionally stable, and quality is good, but need autoclave or high-pressure pump, high pressure sealing bag and transmission medium, be easy to occur sealing bag leakage pollution goods, and production equipment and complex process, general condition is difficult to realize.
Summary of the invention
The object of the present invention is to provide a kind of soft mode compression-moulding methods that can improve polytetrafluoroethylene (PTFE) thin-walled shell quality of item, qualification rate and production efficiency.
To achieve these goals, the present invention has adopted following steps:
1. make rigid die and charging frock, suitable rubber or the elastomer soft mode of preparation thickness according to product size and polytetrafluoroethylene (PTFE) shrinkage factor;
2. charging, promptly press the goods base thickness: 1: 5 (compression ratio) place mat of bed material ≈ PTFE bed material, reinforced in the cavity of core rod and former formation;
3. after extracting the charging frock out, cold pressing, force value is all 150～400kg/cm mutually with common PTFE powder molding pressure value
2
4. with the free sintering of PTFE goods of cold moudling, temperature-fall period (320～330) in sintering process is finalized the design, being about to goods takes out rapidly from agglomerating plant, putting into mould suppresses, pressure is identical with the pressure of colding pressing, under pressure, keep 10～30min, treat that goods cool off the back fully and take out.
The invention belongs to isobaric compression molding method, between rigid die and polytetrafluoroethylene powder, adjust and transfer molding pressure with having certain flexible soft mode, can remedy be difficult to avoid in the polytetrafluoroethylene (PTFE) shaped piece charging process inhomogeneous well, overcome the defective in the polytetrafluoroethylene (PTFE) thin-walled shell product molding, quality of item and qualification rate have had raising fundamentally, and do not need to increase any new equipment, liquid medium and sealing bag.Utilize common press and sintering furnace,, adopt the present invention by preparation rigid die, soft mode and charging frock, just can produce the accurate in size thin-walled shell goods of external surface (or interior shape face), the goods internal soundness is even, the qualification rate height, the production efficiency height, with low cost.
Description of drawings
Fig. 1～Fig. 6 is at first embodiment of the present invention---outer platen press, and Fig. 7～Figure 11 is at an alternative embodiment of the invention---interior platen press, wherein:
Fig. 1 is a rigid die schematic diagram of the present invention;
Fig. 2 a is the profile of charging core rod location;
Fig. 2 b is the vertical view of charging core rod location;
Fig. 3 is the soft mould schematic diagram;
Fig. 4 is for adding the bed material schematic diagram;
Fig. 5 is reinforced and taking-up charging frock schematic diagram;
Fig. 6 is the pressing process schematic diagram;
Fig. 7 is interior platen press rigid die schematic diagram;
Fig. 8 is interior platen press soft mould schematic diagram;
Fig. 9 adds the bed material schematic diagram for interior platen press;
Figure 10 is the reinforced and taking-up charging frock schematic diagram of interior platen press;
Figure 11 is interior platen press pressing process schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is further specified:
As Fig. 1～Figure 6 shows that first embodiment of the present invention---outer platen press, concrete steps are as follows: (1) is according to shrinkage factor design and manufacturing rigid die, charging frock and the suitable rubber or the elastomer soft mode 1 of thickness of product size and polytetrafluoroethylene (PTFE), rigid die comprises product molding formpiston 2, soft mould formpiston 3, guide ring 4 and former 5, and the charging frock then comprises charging core rod 6 and is 120 ° of equally distributed three core rod locating pieces 7; (2) press the goods base thickness: 1: 5 (compression ratio) place mat of bed material ≈ PTFE bed material 8, three core rod locating piece 7-1,7-2,7-3 are 120 ° to be placed on the guide ring 4, put into charging core rod 6 at their formed centers and touch PTFE bed material 8, reinforced then 9-1; (3) add the PTFE powder after, take out core rod locating piece 7-1,7-2,7-3, and with the charging core rod 6 push powder towards periphery gently, the core rod 6 of carefully will feeding is afterwards extracted out, product molding formpiston 2 is carefully put into 9-2 cold pressing, force value is all 150～400kg/cm mutually with common PTFE powder molding pressure value
2, 9-1,9-2 are loose shape PTFE, and 9-3 is the PTFE goods in the preformed, and 9 is the PTFE moulded products; (4) with the free sintering of PTFE goods of cold moudling, in order to guarantee the accurate of article inner surface, temperature-fall period (320～330) in sintering process is finalized the design, be specially: goods are taken out rapidly from agglomerating plant, suppress, pressure is identical with the pressure of colding pressing, and keeps 10～30min under pressure, treats that goods cool off the back fully and take out.
As Fig. 7～Figure 11 shows that an alternative embodiment of the invention---interior platen press, concrete steps are as follows: (1) is according to the shrinkage factor design and the manufacturing rigid die of product size and polytetrafluoroethylene (PTFE), charging frock and suitable rubber or the elastomer soft mode 10 of thickness, rigid die comprises product molding formpiston 11, formpiston adjustment ring 12, guide ring adjustment ring 13, guide ring 14, product molding former 15 and soft mould former 16, the shared product molding formpiston 11 of soft mould and product molding, product molding former 15 is used for moulded products, and 16 of soft mould formers are used for the moulding soft mode; (2) press the goods base thickness: 1: 5 (compression ratio) place mat of bed material ≈ PTFE bed material 17, reinforced then, form loose preform 18-1,18-2; (3) add the PTFE powder after, take out core rod locating piece 7-1,7-2,7-3, and with the charging core rod 6 push powder towards periphery gently, the core rod 6 of carefully will feeding is afterwards extracted out, formpiston adjustment ring 12, soft mode 10 are enclosed within on the product molding formpiston 11, put into loose preform 18-2 and cold pressing, 18-1,18-2 are loose shape PTFE; 18-3 is the PTFE goods in the preformed; The 18-PTFE moulded products, other operations are identical with outer platen press.
Obviously, interior platen press and the difference of outer platen press are that the contact position of soft mode and goods is different in the forming process because the inside and outside surface size difference of goods, therefore in platen press also different with outer platen press moulding frock size.During moulding, soft mode and article inner surface contact moudling are interior platen press, otherwise are outer platen press.When to the article inner surface dimensional requirement when strict, with the soft mode external pressure method of forming; Otherwise use the internally pressuring shaping method.
Claims (3)
1. polytetrafluoroethylene (PTFE) thin-walled shell goods soft mode compression-moulding methods is characterized in that and can realize by following steps:
(1) makes rigid die and charging frock, suitable rubber or the elastomer soft mode of preparation thickness according to product size and polytetrafluoroethylene (PTFE) shrinkage factor;
(2) charging, promptly press the goods base thickness: 1: 5 (compression ratio) place mat of bed material ≈ PTFE bed material, reinforced in the cavity of core rod and former formation;
(3) after the extraction charging frock, cold pressing, force value is all 150～400kg/cm mutually with common PTFE powder molding pressure value
2
(4) with the free sintering of PTFE goods of cold moudling, temperature-fall period (320～330) in sintering process is finalized the design, being about to goods takes out rapidly from agglomerating plant, putting into mould suppresses, pressure is identical with the pressure of colding pressing, under pressure, keep 10～30min, treat that goods cool off the back fully and take out.
2. soft mode compression-moulding methods according to claim 1, it is characterized in that: the rigid die of outer platen press comprises product molding formpiston (2), soft mould formpiston (3), guide ring (4) and former (5), and the charging frock then comprises charging core rod (6) and is 120 ° of equally distributed three core rod locating pieces (7).
3. soft mode compression-moulding methods according to claim 1, it is characterized in that: the rigid die of interior platen press comprises product molding formpiston (11), formpiston adjustment ring (12), guide ring adjustment ring (13), guide ring (14), product molding former (15) and soft mould former (16), the shared product molding formpiston of soft mould and product molding (11), product molding former (15) is used for moulded products, and soft mould former (16) then is used for the moulding soft mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101154583A CN100336651C (en) | 2003-11-26 | 2003-11-26 | Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101154583A CN100336651C (en) | 2003-11-26 | 2003-11-26 | Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544231A true CN1544231A (en) | 2004-11-10 |
| CN100336651C CN100336651C (en) | 2007-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101154583A Expired - Lifetime CN100336651C (en) | 2003-11-26 | 2003-11-26 | Die pressing and forming method for polytetrafluoroethylene thin wall crustose products flexible die |
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| Country | Link |
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| CN (1) | CN100336651C (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456233A (en) * | 2007-12-14 | 2009-06-17 | 深圳市裕鼎精密工业科技股份有限公司 | Hot compacting die of pasted film and technique for hot compacting film using the same |
| CN102537364A (en) * | 2011-04-27 | 2012-07-04 | 沈阳北碳密封有限公司 | Manufacture method of poly ether ether ketones (PEEK) nonmetallic honeycomb seal |
| CN101767447B (en) * | 2009-12-30 | 2013-04-24 | 温州赵氟隆有限公司 | Molding method and processing equipment of polytetrafluoroethylene plastic elbow |
| CN104149234A (en) * | 2014-07-31 | 2014-11-19 | 上海复合材料科技有限公司 | Novel continuous molding mould for ultrathin component |
| CN104325587A (en) * | 2014-11-17 | 2015-02-04 | 天津市天塑滨海氟塑料制品有限公司 | Mold for producing polytetrafluoroethylene groove plate and preparation method of groove plate |
| CN104416915A (en) * | 2013-09-05 | 2015-03-18 | 比亚迪股份有限公司 | Device and method for making shell |
| CN104723567A (en) * | 2015-02-25 | 2015-06-24 | 中昊晨光化工研究院有限公司 | Forming method for modified polytetrafluoroethylene plastic product |
| CN105522673A (en) * | 2016-01-19 | 2016-04-27 | 南昌航空大学 | Elastomer-assisted heating and pressurizing forming method for film printing |
| CN106239811A (en) * | 2016-09-30 | 2016-12-21 | 哈尔滨东安实业发展有限公司 | A kind of tetrafluoroethene lips compacting tool set |
| CN107981887A (en) * | 2017-12-19 | 2018-05-04 | 深圳先进技术研究院 | Ultrasonic transducer, focused transducer and focused transducer production method |
| CN112714689A (en) * | 2018-09-27 | 2021-04-27 | 斯特拉塔西斯公司 | Methods and systems for additive manufacturing with sacrificial structures for easy removal |
| CN113320117A (en) * | 2021-06-21 | 2021-08-31 | 刘烈新 | Continuous special-shaped component soft mold and manufacturing method thereof |
| US11584089B2 (en) | 2017-05-29 | 2023-02-21 | Stratasys Ltd. | Method and system for additive manufacturing of peelable sacrificial structure |
| US11897187B2 (en) | 2017-12-28 | 2024-02-13 | Stratasys Ltd. | Method and system for additive manufacturing of peelable sacrificial structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0615663A (en) * | 1992-07-01 | 1994-01-25 | Nitto Denko Corp | Cylindrical fluororesin molded piece and production thereof |
-
2003
- 2003-11-26 CN CNB2003101154583A patent/CN100336651C/en not_active Expired - Lifetime
Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456233B (en) * | 2007-12-14 | 2013-11-13 | 深圳市裕鼎精密工业科技有限公司 | Hot compacting die of pasted film and technique for hot compacting film using the same |
| CN101456233A (en) * | 2007-12-14 | 2009-06-17 | 深圳市裕鼎精密工业科技股份有限公司 | Hot compacting die of pasted film and technique for hot compacting film using the same |
| CN101767447B (en) * | 2009-12-30 | 2013-04-24 | 温州赵氟隆有限公司 | Molding method and processing equipment of polytetrafluoroethylene plastic elbow |
| CN102537364A (en) * | 2011-04-27 | 2012-07-04 | 沈阳北碳密封有限公司 | Manufacture method of poly ether ether ketones (PEEK) nonmetallic honeycomb seal |
| CN104416915B (en) * | 2013-09-05 | 2017-07-04 | 比亚迪股份有限公司 | Make the device and method of housing |
| CN104416915A (en) * | 2013-09-05 | 2015-03-18 | 比亚迪股份有限公司 | Device and method for making shell |
| CN104149234A (en) * | 2014-07-31 | 2014-11-19 | 上海复合材料科技有限公司 | Novel continuous molding mould for ultrathin component |
| CN104325587A (en) * | 2014-11-17 | 2015-02-04 | 天津市天塑滨海氟塑料制品有限公司 | Mold for producing polytetrafluoroethylene groove plate and preparation method of groove plate |
| CN104723567A (en) * | 2015-02-25 | 2015-06-24 | 中昊晨光化工研究院有限公司 | Forming method for modified polytetrafluoroethylene plastic product |
| CN105522673A (en) * | 2016-01-19 | 2016-04-27 | 南昌航空大学 | Elastomer-assisted heating and pressurizing forming method for film printing |
| CN106239811A (en) * | 2016-09-30 | 2016-12-21 | 哈尔滨东安实业发展有限公司 | A kind of tetrafluoroethene lips compacting tool set |
| US11584089B2 (en) | 2017-05-29 | 2023-02-21 | Stratasys Ltd. | Method and system for additive manufacturing of peelable sacrificial structure |
| CN107981887A (en) * | 2017-12-19 | 2018-05-04 | 深圳先进技术研究院 | Ultrasonic transducer, focused transducer and focused transducer production method |
| CN107981887B (en) * | 2017-12-19 | 2020-06-16 | 深圳先进技术研究院 | Ultrasonic transducer, focusing transducer and manufacturing method of focusing transducer |
| US11897187B2 (en) | 2017-12-28 | 2024-02-13 | Stratasys Ltd. | Method and system for additive manufacturing of peelable sacrificial structure |
| CN112714689A (en) * | 2018-09-27 | 2021-04-27 | 斯特拉塔西斯公司 | Methods and systems for additive manufacturing with sacrificial structures for easy removal |
| CN112714689B (en) * | 2018-09-27 | 2022-11-15 | 斯特拉塔西斯公司 | Methods and systems for additive manufacturing with sacrificial structures for easy removal |
| US11786347B2 (en) | 2018-09-27 | 2023-10-17 | Stratasys Ltd. | Method and system for additive manufacturing with a sacrificial structure for easy removal |
| CN113320117A (en) * | 2021-06-21 | 2021-08-31 | 刘烈新 | Continuous special-shaped component soft mold and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100336651C (en) | 2007-09-12 |
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Granted publication date: 20070912 |
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