CN101560054B - Method for shaping head of optical fiber preform - Google Patents
Method for shaping head of optical fiber preform Download PDFInfo
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- CN101560054B CN101560054B CN 200910099144 CN200910099144A CN101560054B CN 101560054 B CN101560054 B CN 101560054B CN 200910099144 CN200910099144 CN 200910099144 CN 200910099144 A CN200910099144 A CN 200910099144A CN 101560054 B CN101560054 B CN 101560054B
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- optical fiber
- shaping
- preform
- fiber preform
- head
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01251—Reshaping the ends
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
- C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
- C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
- C03B37/02772—Fibres composed of different sorts of glass, e.g. glass optical fibres shaping the preform lower end or bulb, e.g. pre-gobbing, controlling draw bulb shape, or preform draw start-up procedures
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2205/00—Fibre drawing or extruding details
- C03B2205/47—Shaping the preform draw bulb before or during drawing
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention discloses a method for shaping the head of an optical fiber preform, and the existing cutting and shaping processing technology needs more starting time when fiber drawing, thus leading to longer starting wasted optical fiber of the optical fiber preform. A shaping section of the optical fiber perform is heated so as to ensure the shaping section to reach a stretchable softening temperature; the heated part is stretched, and in the stretching process, the pulling force is basically kept below a limiting value; in the stretching process, a measuring device which is on the same plane as the heating device is used to measure at least one geometric parameter of the optical fiber perform, and according to the measured geometric parameter, the pulling force and hauling speed are controlled and the measuring device and the high temperature point of the heating device are controlled to be in a same plane which is basically vertical to the axis of the optical fiber preform; and inthe whole shaping processing process, a control unit is used to control completely and automatically. The shaping quality of the head of the optical fiber preform can be improved, and the head shape of the optical fiber preform can be obtained with high quality and satisfactory fiber drawing.
Description
Technical field
The present invention relates to the making of preform, relate to form the method for the glass optical fiber prefabricating stick, particularly a kind of shaping head of optical fiber preform that use for optical fiber specifically.
Background technology
In the production process of preform, known have a multiple treating processes, comprising vapor-phase axial deposition (VAD) treating processes, outer gas deposition (OVD) treating processes, modified version chemical vapor deposition (MCVD) treating processes, plasma chemical vapor deposition (PCVD) treating processes etc.
The treating processes of many known making preforms all comprises a stage, is called shaping head of optical fiber preform and handles.Owing to all can apply in the preform making processes and connect the tail rod, handle so many known making preform treating processess all can be cut shaping to the preform two ends of moulding at its two ends.The shaping of cutting at preform two ends is the final processing stages that obtain final preform finished product, wherein, just cuts shaping and handles itself, and known have a various treatment process.These treatment processs comprise that cutting process, angular surface grinding are handled and shaping processing etc. is cut in heating.
Cut in the treatment process known, it is modal processing mode that cutting process, angular surface grinding are handled.In general, this method does not have complicated treating processes, in this case, only need make preform fastening, makes its some cross sections cutting along preform by suitable cutting fltting speed of given cutting blade then.The applicant notices, in drawing optical fibers, needs longer starting the time, and causes the longer initial optical fiber of scrapping of preform by this method.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome the existing shaping treatment technology of cutting to need longer starting the time when drawing optical fibers, cause the longer initial defective of scrapping optical fiber of preform, a kind of method of shaping head of optical fiber preform is provided, for this reason, the present invention is by the following technical solutions:
A kind of method of shaping head of optical fiber preform is characterized in that:
Between shaping region, make to reach stretchable softening temperature between shaping region by the heating unit heating optical fiber preform;
By traction element preform is applied the pulling force described hot spots that stretches, and in drawing process, make pulling force remain on below the limit value substantially;
In drawing process, utilize on the mobile platform and heating unit is at least one geometric parameter that comprises partial contour between described shaping region of conplane measuring apparatus measuring optical fiber prefabricated rods, and control the size and the pulling speed of above-mentioned pulling force according to the geometric parameter of measuring;
In drawing process, the high temperature dot of control survey device and heating unit is in same plane and this plane keeps vertical substantially with the preform axis;
In whole shaping processing process, control automatically by control unit fully.
Mode and technology according to processing of the present invention, what the present invention emphasized is that the method that shaping is handled is cut in heating, comprise between certain shaping region of heating optical fiber preform, make and reach stretchable softening temperature between shaping region, make traction element apply certain pulling force stretching hot spots by control unit then, and pulling force is remained on below the limit value substantially preform.
Yet, method set forth in the present invention can significantly reduce initial length of scrapping optical fiber, in process furnace or by torch equipment, heating optical fiber preform cut the position up to softening temperature, by traction element preform is applied certain pulling force stretching hot spots then.The head that obtains by this method coning and the smooth surface zero defect.
According to other the treatment process of cutting, preform in cutting process without any need for the processing of intelligent monitoring and data image.The present invention is different with it to be in whole shaping process, all control automatically by control unit, be included in the drawing process, utilize on the blowtorch platform and be in conplane at least one geometric parameter of measuring apparatus measuring optical fiber prefabricated rods with heating torch, and according to the pulling force size and the pulling speed of the geometric parameter control cutting process of measuring, and the high temperature dot of measuring apparatus and heating unit should be in same plane and this plane keeps vertical substantially with the preform axle center.
The inventive method can obtain to allow the satisfied finished product preform of drawing optical fibers, optical fiber utilization ratio when the preform that obtains by method of the present invention can improve drawing optical fibers, can also improve the quality of shaping head of optical fiber preform according to method of the present invention, by the on-line monitoring of measuring apparatus in cutting process, thereby obtain high-quality head of optical fiber preform shape.
Other purposes of the present invention and advantage will propose in the following description, and the detailed description by following embodiments of the invention becomes apparent, and objects and advantages of the present invention can make up realization by the ways and means that is proposed in the claims.
Description of drawings
Fig. 1 is for realizing the device synoptic diagram of the inventive method.
Fig. 2 is a process control chart of the present invention.
Fig. 3 be preform in head shaping process, softened zone domain measurement point choice of location synoptic diagram.
Fig. 4 is in the shaping head of optical fiber preform process, the tractive force of traction element and the relation curve of preform diameter behind over-fitting.
Fig. 5 is three kinds of head outer diameter that obtain under different control condition, and the preform capitiform after it has represented to cut is that the difference with control condition changes.
Number in the figure explanation: 1-lathe, 2-fixing part, 3-traction element, the 4-preform, an end of 5-preform, 6-preform main body, between the 7-shaping region, the other end of 8-preform, 9-connect the tail rod, 10-preform axial line, 11-mobile platform, 12-measuring apparatus, the 13-heating unit, the 14-data handling system, 15-driving mechanism, 16-driving mechanism.
Embodiment
Below the present invention will be further described.
The method of a kind of shaping head of optical fiber preform of the present invention, its design is:
By between the shaping region of heating unit 13 heating optical fiber preforms 47, make between shaping region 7 to reach stretchable softening temperature;
Apply the pulling force described hot spots that stretches by 3 pairs of preforms of traction element, and in drawing process, make pulling force remain on below the limit value substantially;
In drawing process, utilize on the mobile platform 11 and heating unit 13 is at least one geometric parameters that comprises 7 partial contours between described shaping region (for example taking the digital picture of this zone at least a portion) of conplane measuring apparatus 12 measuring optical fiber prefabricated rods, and control the size and the pulling speed of above-mentioned pulling force according to the geometric parameter of measuring;
In drawing process, the high temperature dot of control survey device 12 and heating unit 13 is in same plane and this plane keeps vertical substantially with the preform axis;
In whole shaping processing process, control automatically by control unit fully.
As to further the improving and replenishing of technique scheme, the present invention also comprises following additional technical characterictic, so that select for use according to demand when stating technical scheme on the implementation:
7 partial contour is on a predetermined distance between 7 the softening end point between 7 softening starting point between shaping region and shaping region between the shaping region of measuring optical fiber prefabricated rods, selects the measuring position of preform diameter.The measuring position of the preform diameter of selecting is consistent with the position of the top temperature point of shaping unit that heating unit 13 heats.
In traction element 3 drawing process, be added between the preform shaping region 7 the heat and the geometric parameter of measurement by adjustment, make the tractive force that is added on the preform remain on below the limit value substantially.
To 7 heating between the shaping region of preform 4, control according to the geometric parameter of measuring gained by the flow of described heating member gas by burning heating member gas for heating unit 13.
The position of the measured geometric parameter of measuring apparatus 12 should be consistent with the top temperature point between 7 the softening end point between 7 softening starting point between shaping region and shaping region in the operating process.
The position of planar described in the operating process should be certain position between 7 the softening end point between 7 softening starting point and shaping region between shaping region, and keeps vertical with preform axial line 10 is basic.
Following examples are in order to explain realization principle of the present invention better, and this embodiment enumerates in conjunction with the accompanying drawings only as non-limitative example:
With reference now to accompanying drawing and example, be illustrated, Fig. 1 shows the simple device synoptic diagram of implementing the inventive method.Its implementation comprises between certain shaping region of heating optical fiber preform, makes it reach stretchable softening temperature; By traction element preform is applied certain pulling force stretching hot spots then, and in drawing process, make the pulling force kept stable and at certain below the limit value.More particularly, the present invention realizes by device shown in Figure 1, device shown in Figure 1, and it comprises horizontal lathe 1, fixing part 2 and the traction element 3 consistent with preform axial line 10 that this lathe has an along continuous straight runs.One end, 5 clampings of preform 4 must be considered the size of clamping power during clamping on fixing part 2, the preform surface is crushed, and preform is got loose.And the other end 8 of preform 4 must with one connect tail rod 9 connect and clamping on traction element 3.Thus, preform 4 will stretch between fixing part 2 on the direction consistent with preform axial line 10 and traction element 3.
In shaping processing process, but mobile platform 11 along continuous straight runs move left and right, heat some definite position of 7 between the shaping region of the 13 pairs of preforms 4 of heating unit on the mobile platform, make it reach stretchable softening temperature, apply certain pulling force stretching hot spots by 3 pairs of preforms 4 of traction element then.In this process, measuring apparatus on the mobile platform 11 12 will be constantly carries out on-line monitoring to the hot spot of preform 4, and at least one geometric parameter is measured, comprises that the detection fiber prefabricated rods cuts the profile of at least a portion in the zone.Data handling system 14 reads the take off data of input, handle and obtain corresponding geometric parameter, and the instruction after will handling is fed to driving mechanism 15 and 16, drive mobile platform 11 and traction element 3 respectively by driving mechanism 15 and 16 then, thereby make mobile platform 11 and traction element 3 obtain a needed gas flow of corresponding with it heating and tractive force.By this again and again from monitoring the tensile process, shaping head of optical fiber preform is the capitiform shape and size of target call the most at last.
In this course, the concentric shafts of the travel direction of mobile platform 11 and fixing part 2 and traction element 3 preform axial line 10 basic keeping parallelisms and in a plane just.Measuring apparatus 12 on the mobile platform 11 should keep vertical with preform axial line 10 with the plane that heating unit 13 is formed.
In whole shaping processing process, automatically controlling by control unit can be with reference to the schema according to Fig. 2, take off data for input, the data handling system step-by-step processing of will classifying, measuring apparatus is a geometric parameter in the measuring optical fiber prefabricated rods shaping unit zone at least, comprise from softening regional starting point to the partial contour the softening regional end point, the perhaps a certain image of shaping unit.Preferably, measuring apparatus has a wave filter or a plurality of wave filter, so that improve the quality of taking profile or image.Particularly, can use infrared filter or Polarization filter.These wave filters can be selected according to actual needs.
In data handling system, can write automatic measurement monitoring and handle computation program, particularly, increase some images and data processing software, can make the processing of data faster and accurate.Thereby make and avoid the phenomenon of delaying time in the cutting process as far as possible.Some control software also can be installed control heat and traction element, so that can set separately flow and translational speed as required, control is by the nose shape of shaping preform.
Should be pointed out that the device type and the control device of shaping head of optical fiber preform, should be as the limitation of the present invention condition.Can replace so long as realize identical any device type and the control device of principle.For example, can adopting longitudinally, stretcher carries out the shaping of cutting of vertical direction; Also can realize shaping by similar control unit and treatment system to head of optical fiber preform.
Handle when initial in shaping, need very high gas flow guarantee that the preform shaping unit reaches softening temperature.Since when right cylinder absorbs external heat, radial temperature distribution gradient, and so cylindrical surface at first is heated, along with the continuous heat supply of well heater, heat will be from the surface to cylindrical central shaft transmission.When the central shaft position of preform reached softening temperature, we just can think and have reached softening temperature between the shaping region of this preform.
When the preform diameter was big, needed gas flow was just big more.Along with reducing of optical fiber prefabricating rod outside diameter, gas flow reduces to such an extent that be not clearly during beginning, and along with further reducing of optical fiber prefabricating rod outside diameter, it is remarkable that the reduction degree of gas flow also becomes gradually.When optical fiber prefabricating rod outside diameter during near vanishing, it is very little that the flow of gas also becomes.But can not to guarantee that at least the part of cutting the position is in soft state for zero.
In fact, gas flow is not certain with the variation relation of optical fiber prefabricating rod outside diameter.As long as satisfy the operating process of this process of shaping head of optical fiber preform in principle, comprise between certain shaping region of heating optical fiber preform, make it reach stretchable softening temperature; By traction element preform is applied certain pulling force stretching hot spots, and pulling force is remained on below the limit value substantially.We can select different control modes as required.More particularly, we can select different heating units, utilize the heating efficiency of heating unit and performance to formulate the best enforcement control process of a cover.
Fig. 3 puts a regioselective embodiment according to preform softened zone domain measurement in head shaping process.In this embodiment, the softening zone of preform is (X
2-X
1), X
3Be any one measurement point in this softening zone.Wherein, this measurement point must satisfied comprise at least a portion profile in the softening zone of preform.In this fact Example, selection be that preform is at the diameter D of this measurement point (X
3).
In fact, when selecting the position of measurement point, not will certainly die to remove and apply arbitrarily, require as long as the geometric parameter of measurement satisfies actual production.Such as, can select a measuring parameter, also can select two or more measuring parameter; For another example, measuring parameter can be the complete image in whole softening zone, also can be any a part of profile in the softening zone.Therefore, in actual application, should be in conjunction with the technological principle of self, the various metering system of applying in a flexible way.
Fig. 4 has shown in the shaping head of optical fiber preform process that stretching and drawing power is with the matched curve that concerns of optical fiber prefabricating rod outside diameter variation.In this example, in the initial stage and the ending phase of shaping head of optical fiber preform, the tractive force fluctuation is very obvious, and is steady relatively at interlude, do not have too big variation.Preferably, the variation of tractive force size can kept stable in the shaping head of optical fiber preform process.But in a lot of practical applications,, reduce cost, can limit setting, it is changed in the controlled scope of safety get final product tractive force in order to increase work efficiency.
In the shaping process, can guarantee that the head tip portion of preform can be not eccentric with appropriate means.For example, the concentric shafts of along continuous straight runs is given certain speed of rotation, when speed reaches a certain set(ting)value, can think that the central shaft of preform is constant.
Fig. 5 is three examples implementing by method set forth in the present invention, and by three different control processs, the outer diametal curve of resulting three preform capitiforms as shown in Figure 5.
The method of the use of these three examples is all the same with ultimate principle, and difference has been to adopt three kinds of different controlled variable.For better explanation control process and parameter are to influence of the present invention, the applicant has adopted three examples to come comparative illustration.In the shaping process, comprise following process: between certain shaping region of heating optical fiber preform, make it reach stretchable softening temperature; By traction element preform is applied certain pulling force stretching hot spots, and pulling force is remained on below the limit value substantially.More particularly, in said process, the measurement of at least one geometric parameter comprises the profile of at least a portion in the detection fiber prefabricated rods shaping unit zone, for example takes the digital picture of this zone at least a portion.Till preform is separated fully.The M of the outer diametal curve of head of optical fiber preform after the shaping such as Fig. 5
0Shown in.
In Fig. 5, M
0, M
1, M
2It is respectively the head outer diameter of the preform after the shaping.In the figure, the head axial length of curve M 1 pairing preform is the shortest, curve M
2The head axial length of pairing preform is the longest.Control process difference, the head of optical fiber preform shape after the shaping are also different.Head of optical fiber preform shape for drawing optical fibers requires can obtain by different control processs and processing parameter.Preferably, the nose shape of preform and M
0External diameter tendency unanimity.Advantage of the present invention can be adjusted control process and processing parameter by above-mentioned method with regard to being, thereby obtains to meet most the head of optical fiber preform shape of drawing optical fibers requirement.
In the above-described embodiments, according to the method for a kind of shaping head of optical fiber preform provided by the invention, some actually operatings and checking have been carried out.Embodiment provided here is just in order to illustrate enforcement principle of the present invention and control method better.Actually, for the person skilled in the art, other improvement and remodeling will be easy to make.As long as do not departing under the scope of the present invention in appending claims definition, can be according to concrete processing requirement to the embodiment that the present invention enumerated, and other embodiment does some modification.Therefore, the present invention is not limited to the specific detail and the embodiment of above-mentioned explanation aspect broad.
The present invention can be used to make preform.Particularly, the present invention's head shaping that can be used for the preform that makes as VAD, OVD, MCVD and PCVD etc. is handled.
Claims (7)
1. the method for a shaping head of optical fiber preform is characterized in that:
By between the shaping region of heating unit (13) heating optical fiber preform (4) (7), make that (7) reach stretchable softening temperature between shaping region;
By traction element (3) preform is applied the pulling force described hot spots that stretches, and in drawing process, make pulling force remain on below the limit value substantially;
In drawing process, utilize mobile platform (11) to go up at least one geometric parameter that comprises (7) partial contour between described shaping region that is in conplane measuring apparatus (12) measuring optical fiber prefabricated rods with heating unit (13), and control the size and the pulling speed of above-mentioned pulling force according to the geometric parameter of measurement;
In drawing process, the high temperature dot of control survey device (12) and heating unit (13) is in same plane and this plane keeps vertical substantially with the preform axis;
In whole shaping processing process, control automatically by control unit fully.
2. the method for a kind of shaping head of optical fiber preform according to claim 1, the partial contour that it is characterized in that (7) between the shaping region of described measuring optical fiber prefabricated rods is on a predetermined distance between the softening end point of (7) between the softening starting point of (7) between shaping region and shaping region, selects the measuring position of preform diameter.
3. the method for a kind of shaping head of optical fiber preform according to claim 2 is characterized in that the measuring position of the preform diameter of described selection is consistent with the position that heating unit (13) heats the top temperature point of shaping unit.
4. the method for a kind of shaping head of optical fiber preform according to claim 1, it is characterized in that in traction element (3) drawing process, be added on the heat of (7) between the preform shaping region and the geometric parameter of measurement by adjustment, make the tractive force that is added on the preform remain on below the limit value substantially.
5. the method for a kind of shaping head of optical fiber preform according to claim 1, it is characterized in that described heating unit (13) heats by (7) between the shaping region of burning heating member gas to preform (4), the flow of described heating member gas is controlled according to the geometric parameter of measuring gained.
6. between the method for a kind of shaping head of optical fiber preform according to claim 1, the position that it is characterized in that the geometric parameter that measuring apparatus in the operating process (12) is measured and shaping region between the softening starting point of (7) and shaping region the top temperature point between the softening end point of (7) consistent.
7. the method for a kind of shaping head of optical fiber preform according to claim 1, the planar position, high temperature dot place that it is characterized in that measuring apparatus described in the operating process (12) and heating unit (13) is certain position between the softening end point of (7) between the softening starting point of (7) between shaping region and shaping region, and keeps vertical with preform axial line (10) is basic.
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102923941B (en) * | 2012-11-29 | 2014-11-19 | 长飞光纤光缆股份有限公司 | Method for tapering optical fiber preform |
| CN103424359B (en) * | 2013-08-20 | 2016-04-27 | 天津大学 | A kind of ultra-thin-wall microtubule producing device and preparation method thereof |
| CN103496847B (en) * | 2013-09-16 | 2015-07-08 | 江苏亨通光电股份有限公司 | Method for manufacturing large-sized optical fiber preform rod guide cone |
| CN106698917B (en) * | 2017-01-09 | 2018-03-13 | 江苏斯德雷特通光光纤有限公司 | A kind of method that prefabricated rods draw bipyramid |
| CN106881365B (en) * | 2017-02-27 | 2018-10-12 | 天津富通集团有限公司 | Prefabricated rods processing method |
| CN109709639B (en) * | 2019-02-21 | 2020-11-24 | 武汉理工大学 | Platform and method for manufacturing fully-distributed three-core chalcogenide long fiber grating |
| CN109912189B (en) * | 2019-04-23 | 2021-08-03 | 北京大盟创业科技有限公司 | High-precision optical fiber tapering equipment |
| CN112159094A (en) * | 2020-05-14 | 2021-01-01 | 江苏永鼎光纤科技有限公司 | Automatic processing method for optical fiber preform taper head |
| CN114136241B (en) * | 2021-12-01 | 2024-04-19 | 南通大学 | Method for measuring eccentricity of optical fiber preform |
| CN114790077A (en) * | 2022-06-01 | 2022-07-26 | 江苏亨通光导新材料有限公司 | Continuous operation type optical fiber preform extending device and method |
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| CN1208270C (en) * | 1999-11-16 | 2005-06-29 | 朗迅科技公司 | Improved method for making multimode optical fiber and the optical fiber made by said method |
| CN1847180A (en) * | 2005-04-13 | 2006-10-18 | 浙江富通光纤技术有限公司 | Production process capable of improving cut-off wavelength of fiber preform rod |
| CN100387536C (en) * | 1998-04-09 | 2008-05-14 | 阿尔卡塔尔公司 | Optical fiber prefabricated rod butt-welded using plasma torch |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100387536C (en) * | 1998-04-09 | 2008-05-14 | 阿尔卡塔尔公司 | Optical fiber prefabricated rod butt-welded using plasma torch |
| CN1208270C (en) * | 1999-11-16 | 2005-06-29 | 朗迅科技公司 | Improved method for making multimode optical fiber and the optical fiber made by said method |
| CN1847180A (en) * | 2005-04-13 | 2006-10-18 | 浙江富通光纤技术有限公司 | Production process capable of improving cut-off wavelength of fiber preform rod |
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