CN108821564A - The manufacturing method of preform - Google Patents
The manufacturing method of preform Download PDFInfo
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- CN108821564A CN108821564A CN201810852202.7A CN201810852202A CN108821564A CN 108821564 A CN108821564 A CN 108821564A CN 201810852202 A CN201810852202 A CN 201810852202A CN 108821564 A CN108821564 A CN 108821564A
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- outer diameter
- loose media
- decrease speed
- preform
- blowtorch
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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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
-
- 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
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01446—Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering
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- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General 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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
This application discloses a kind of manufacturing methods of preform, include the following steps：Periodically scan for loose media outer diameter and calculate loose media outer diameter fluctuation, whenever outer diameter fluctuation be greater than preset range when, adjust corresponding blowtorch；After deposition, loose media outer diameter is scanned, the first decrease speed and the second decrease speed are calculated；Vitrifying is carried out to loose media, wherein in from the pre-determined distance at largest outside diameter, loose media is declined by the first decrease speed, and in from the pre-determined distance at minimum outer diameter, loose media is declined by the second decrease speed.This method is guaranteeing that density is as uniform as possible simultaneously, loose media outer diameter is prevented to fluctuate further expansion by adjusting maximum outside diameter or the corresponding blowtorch flow of minimum outer diameter.It when loose media carries out vitrifying, is adjusted by the decrease speed to region at outer diameter maximum region and minimum outer diameter, keeps the outer diameter of preform more uniform, cored becomes smaller than fluctuation.
Description
Technical field
The present invention relates to field fibers, and in particular to the manufacturing method of preform.
Background technique
Preform usually passes through " two-step method " production, i.e., first with VAD (vapour phase axial deposition technique), OVD (Outside Vapor
Sedimentation), PCVD (plasma vapor deposition processes), one of big flame hydrolysis of MCVD (modified chemical vapor deposition process (MCVD)) four
Technique makes plug, then with flame hydrolysis (such as OVD method) or the covering of casing production plug, " two-step method " technique can be with
Control plug refractive index profile and covering cost control well, are more satisfactory preform manufacturing process.
After completing plug production, covering production is carried out to plug by OVD, including carry out OVD covering deposition and right
Post-depositional loose media carries out vitrified step.
Usual OVD covering deposition adjusts deposition after preform testing result comes out without adjusting and correcting again
Parameter, due to using more blowtorch depositing operations, the blowtorch flow and position all disunities of each each blowtorch of board cannot be timely
Monitor loose media deposition, cause loose media outer diameter uneven, cored than fluctuation it is big, due to each blowtorch temperature and flow not
Together, loose media settled density is also different, and there are cracking phenomenas；
Vitrifying is carried out after OVD loose media deposition, During Vitrification in vitro uses constant loose media decrease speed and furnace temperature
Vitrifying is carried out, loose media outer diameter and density contrast alienation as caused by loose media deposition process are same in During Vitrification in vitro meeting
In the presence of preform can draw and attenuate sometimes, shrink sometimes, will lead to the decline of optical fiber preform core concentricity, outer diameter in this way
Unevenly, cored is than fluctuating the bad phenomenons such as big, and preform technique is unstable, and qualification rate is lower.
In the prior art, there is a kind of loose media outer diameter scanning process, when implementing the technique, every one layer of loose media of deposition is carried out
Outer diameter scanning, the blowtorch flow of adjust automatically deposition process next time when reaching the fluctuation upper limit, to compensate.The technique can
To guarantee that loose media outer diameter is more uniform, but it cannot guarantee loose media even density, loose media density unevenness is received in vitrifying
Than different, the optical fiber prefabricating rod outside diameter fluctuation after vitrifying can amplify for contracting.
Summary of the invention
The present invention in view of the above-mentioned problems, overcome at least one deficiency, propose a kind of manufacturing method of preform.
The technical solution adopted by the present invention is as follows：
A kind of manufacturing method of preform, includes the following steps：
In carrying out OVD deposition process, periodically scans for loose media outer diameter and calculate the outer diameter fluctuation of loose media, whenever
Outer diameter fluctuation be greater than preset range when, adjust maximum outside diameter corresponding to blowtorch, make the flow of blowtorch corresponding to maximum outside diameter by
Preset ratio reduces, or blowtorch corresponding to adjustment minimum outer diameter, makes the flow of blowtorch corresponding to minimum outer diameter by default ratio
Example increases；
After deposition, loose media outer diameter is scanned, final largest outside diameter value, the final minimum outer diameter of loose media are obtained
Position at value, final outer diameter mean value, and corresponding largest outside diameter and at minimum outer diameter, according to final largest outside diameter value, most
Whole minimum outer diameter value and final outer diameter mean value computation go out the first decrease speed and the second decrease speed；
Vitrifying is carried out to loose media, wherein in from the pre-determined distance at largest outside diameter, loose media is by the first lower reduction of speed
Degree decline, in from the pre-determined distance at minimum outer diameter, loose media by the second decrease speed decline, loose media rest part according to
Original decrease speed decline, wherein the first decrease speed is less than original decrease speed, and original decrease speed is less than the second decline
Speed.
In order to guarantee the density uniformity of loose media, the initial flow of all blowtorch is all identical (to contain silicon material, fuel gas
The flow of body, combustion-supporting gas and auxiliary gas is all the same), this can guarantee that the temperature that flame hydrolysis occurs is identical, change
Reaction rate is also identical, i.e. the density of generation loose media is identical, but due to the otherness of blowtorch technique, still can be deposited
In certain deviation, by periodically scanning for loose media outer diameter, it is known that the presence of deviation, presets when outer diameter fluctuation is greater than
When range, by adjusting maximum outside diameter or the corresponding blowtorch flow of minimum outer diameter, is guaranteeing that density is as uniform as possible simultaneously, preventing
Only loose media outer diameter fluctuates further expansion.Loose media carries out in vitrifying, and region is at largest outside diameter with slower first
Decrease speed declines, and region is declined at minimum outer diameter with faster second decrease speed, other regions are under first
Original decrease speed decline between reduction of speed degree and the second decrease speed, because loose volume density is very uniform, loose media outer diameter is big
Position in During Vitrification in vitro, can slightly be drawn and attenuated by slowly declining, the lesser position of loose media outer diameter is in vitrifying
Cheng Zhong can slightly be shunk by comparatively fast declining, when vitrifying by above-mentioned indemnifying measure after, the outer diameter of preform is more
Uniformly, cored becomes smaller than fluctuation.It is not easy to crack end to end because loose volume density is more uniform, compared with the prior art for, optical fiber
The Qualified Length of prefabricated rods can lengthen.
In the present invention wherein an embodiment, the outer diameter of a cycle fluctuates dfCalculation method is：df=(dmax-dmin)/d*
100%, wherein dmaxFor the loose media largest outside diameter value that current period scans, dminThe loose media scanned for current period
Minimum outer diameter value, d are the loose media outer diameter average value that current period scans.
The formula effectively can reliably calculate outer diameter fluctuation, by way of percentage, either for large scale
Loose media or small size loose media, can reliably be judged.
In the application, the calculation of outer diameter average value is：The summation of multiple repairing weld data is divided by sampling number.
In the present invention wherein an embodiment, the preset range of outer diameter fluctuation is 7%~13%；The scanning of loose media outer diameter
Period is 7~13 minutes.
Too small will lead to of the preset range setting of outer diameter fluctuation frequently adjusts blowtorch flow, and preset range is arranged too
Greatly, it will lead to blowtorch adjusting to lag very much, influence the reliable deposition of loose media.
In the present invention wherein an embodiment, the flow of blowtorch is reduced by preset ratio, specially：It is year-on-year by preset ratio
Example is reduced containing silicon material, fuel gas, combustion-supporting gas and the flow for assisting gas；The flow of blowtorch is increased by preset ratio,
Specially：Increase in proportion by preset ratio containing silicon material, fuel gas, combustion-supporting gas and the flow for assisting gas.
When practice, at the maximum outside diameter or at minimum outer diameter corresponding blowtorch there are two when (two adjacent blowtorch
There is overlapping in deposited distance), it can choose one of blowtorch and carry out flow adjustment, also can choose while adjusting the two sprays
Lamp.When adjusting two blowtorch simultaneously, for only adjusting a blowtorch, the regulated quantity of two blowtorch is the former one
Half.
In the present invention wherein an embodiment, the preset ratio is 2%~3%.
In the present invention wherein an embodiment, for blowtorch flow compared with initial flow, flow changes ratio more than or equal to upper
When limit value, stops flow and adjust；The upper limit value is 13%~17%.
In the present invention wherein an embodiment, the preset ratio is 2.5%, and the upper limit value is 15%.
In the present invention wherein an embodiment, the pre-determined distance is 40mm~60mm.
Zone length represented by " in from the pre-determined distance at largest outside diameter " is two pre-determined distances, and largest outside diameter
Place is located at middle.Likewise, zone length represented by " in from the pre-determined distance at minimum outer diameter " be two it is default away from
From, and it is located at middle at minimum outer diameter.Setting in this way, can be uniformly at gentle adjusting fluctuation so that in During Vitrification in vitro
Outer diameter, to keep the outer diameter of preform more uniform, cored becomes smaller than fluctuation.
In the present invention wherein an embodiment, the first decrease speed V1=V0-(Dmax-Da)/100, the second decrease speed V2
=V0+(Da-Dmin)/100, wherein V0For original decrease speed, DmaxFor final largest outside diameter value, DminFor final minimum outer diameter
Value, DaFor final outer diameter mean value.
V0It is preset numerical value for original decrease speed, when practice can be 1.5mm/min~2.5mm/
min.The first decrease speed and the second decrease speed that above-mentioned formula obtains are associated with outer diameter degree of fluctuation, and this speed calculates
Mode can obtain reasonable speed so that in vitrifying, can the uniform gentle outer diameter adjusted at fluctuation, to make light
The outer diameter of fine prefabricated rods is more uniform, and cored becomes smaller than fluctuation.
In the present invention wherein an embodiment, in During Vitrification in vitro, Control for Kiln Temperature is at 1440 DEG C -1460 DEG C；Pass through outer diameter
Scanner carries out the scanning of loose media outer diameter, and the guide rail of outer diameter scanner is parallel with the plug that loose media deposits.Preferably, outside
Diameter scanner and plug are in same level.
The beneficial effects of the invention are as follows：By periodically scanning for loose media outer diameter, it is known that the presence of deviation, when outer
When diameter fluctuation is greater than preset range, by adjusting maximum outside diameter or the corresponding blowtorch flow of minimum outer diameter, to the greatest extent may be used in guarantee density
While can be uniform, loose media outer diameter be prevented to fluctuate further expansion.Loose media carries out in vitrifying, location at largest outside diameter
Domain is declined with the first slower decrease speed, and region is declined at minimum outer diameter with faster second decrease speed, other areas
Domain is with the original decrease speed decline between the first decrease speed and the second decrease speed, because loose volume density is very equal
Even, the big position of loose media outer diameter can slightly be drawn and attenuated in During Vitrification in vitro by slowly declining, and loose media outer diameter is lesser
Position can slightly be shunk in During Vitrification in vitro by comparatively fast declining, when vitrifying by above-mentioned indemnifying measure after, predispersed fiber
The outer diameter of stick processed is more uniform, and cored becomes smaller than fluctuation.Because loose volume density is more uniform, not easy to crack end to end, relatively existing
For having technology, the Qualified Length of preform can be lengthened.
Detailed description of the invention：
Fig. 1 is OVD deposition process process principle figure of the present invention.
Specific embodiment：
Below with reference to each attached drawing, the present invention will be described in detail.
As shown in Figure 1, a kind of manufacturing method of preform, includes the following steps：
S1:In carrying out OVD deposition process, periodically scans for loose media outer diameter and calculates the outer diameter fluctuation of loose media,
When outer diameter fluctuation is greater than preset range, blowtorch corresponding to maximum outside diameter is adjusted, the stream of blowtorch corresponding to maximum outside diameter is made
Amount is reduced by preset ratio, or blowtorch corresponding to adjustment minimum outer diameter, makes the flow of blowtorch corresponding to minimum outer diameter by pre-
If ratio increases；
S2:After deposition, loose media outer diameter is scanned, the final largest outside diameter value for obtaining loose media, final outer diameter are most
Position at small value, final outer diameter mean value, and corresponding largest outside diameter and at minimum outer diameter, according to final largest outside diameter value,
Final minimum outer diameter value and final outer diameter mean value computation go out the first decrease speed and the second decrease speed；
S3:Vitrifying is carried out to loose media, wherein in from the pre-determined distance at largest outside diameter, loose media is pressed under first
The decline of reduction of speed degree, in from the pre-determined distance at minimum outer diameter, loose media is declined by the second decrease speed, loose media rest part
Decline according to original decrease speed, wherein the first decrease speed is less than original decrease speed, and original decrease speed is less than second
Decrease speed.
In order to guarantee the density uniformity of loose media, the initial flow of all blowtorch is all identical (to contain silicon material, fuel gas
The flow of body, combustion-supporting gas and auxiliary gas is all the same), this can guarantee that the temperature that flame hydrolysis occurs is identical, change
Reaction rate is also identical, i.e. the density of generation loose media is identical, but due to the otherness of blowtorch technique, still can be deposited
In certain deviation, by periodically scanning for loose media outer diameter, it is known that the presence of deviation, presets when outer diameter fluctuation is greater than
When range, by adjusting maximum outside diameter or the corresponding blowtorch flow of minimum outer diameter, is guaranteeing that density is as uniform as possible simultaneously, preventing
Only loose media outer diameter fluctuates further expansion.Loose media carries out in vitrifying, and region is at largest outside diameter with slower first
Decrease speed declines, and region is declined at minimum outer diameter with faster second decrease speed, other regions are under first
Original decrease speed decline between reduction of speed degree and the second decrease speed, because loose volume density is very uniform, loose media outer diameter is big
Position in During Vitrification in vitro, can slightly be drawn and attenuated by slowly declining, the lesser position of loose media outer diameter is in vitrifying
Cheng Zhong can slightly be shunk by comparatively fast declining, when vitrifying by above-mentioned indemnifying measure after, the outer diameter of preform is more
Uniformly, cored becomes smaller than fluctuation.It is not easy to crack end to end because loose volume density is more uniform, compared with the prior art for, optical fiber
The Qualified Length of prefabricated rods can lengthen.
In this present embodiment, the outer diameter of a cycle fluctuates dfCalculation method is：df=(dmax-dmin)/d*100%,
In, dmaxFor the loose media largest outside diameter value that current period scans, dminThe loose media minimum outer diameter scanned for current period
Value, d are the loose media outer diameter average value that current period scans.The formula effectively can reliably calculate outer diameter fluctuation, lead to
The mode of percentage is crossed, either for large scale loose media or small size loose media, can reliably be judged.
When practice, the preset range of outer diameter fluctuation can be 7%~13%；The scan period of loose media outer diameter can be with
It is 7~13 minutes.Too small will lead to of the preset range setting of outer diameter fluctuation frequently adjusts blowtorch flow, preset range setting
It is too big, it will lead to blowtorch adjusting and lag very much, influence the reliable deposition of loose media.In this present embodiment, the default model of outer diameter fluctuation
Enclosing is 10%, and the scan period of loose media outer diameter can be 10 minutes.
In this present embodiment, the flow of blowtorch is reduced by preset ratio, specially：It is reduced in proportion by preset ratio siliceous
Raw material, fuel gas, combustion-supporting gas and the flow for assisting gas；The flow of blowtorch is increased by preset ratio, specially：By pre-
If ratio increases in proportion containing silicon material, fuel gas, combustion-supporting gas and the flow for assisting gas.When practice, when most
At big outer diameter or at minimum outer diameter corresponding blowtorch there are two when (there is overlapping in the deposited distance of two adjacent blowtorch), Ke Yixuan
It selects one of blowtorch and carries out flow adjustment, also can choose while adjusting the two blowtorch.When adjusting two blowtorch simultaneously,
For only adjusting a blowtorch, the regulated quantity of two blowtorch is the former half.
When practice, preset ratio is 2%~3%.Compared with initial flow, flow changes ratio and is greater than blowtorch flow
When equal to upper limit value, stops flow and adjust；The upper limit value is 13%~17%.In this present embodiment, preset ratio 2.5%,
Upper limit value is 15%.
When practice, pre-determined distance can be 40mm~60mm, in this present embodiment, pre-determined distance 50mm." from
In pre-determined distance at largest outside diameter " represented by zone length be two pre-determined distances, and at largest outside diameter be located at middle.
Likewise, zone length represented by " in from the pre-determined distance at minimum outer diameter " is two pre-determined distances, and minimum outer diameter
Place is located at middle.Setting in this way so that in During Vitrification in vitro, can the uniform gentle outer diameter adjusted at fluctuation, to make
The outer diameter of preform is more uniform, and cored becomes smaller than fluctuation.
In this present embodiment, the first decrease speed V1=V0-(Dmax-Da)/100, the second decrease speed V2=V0+(Da-
Dmin)/100, wherein V0For original decrease speed, DmaxFor final largest outside diameter value, DminFor final minimum outer diameter value, DaIt is final
Outer diameter mean value.V0It is preset numerical value, when practice can also be 1.5mm/min~2.5mm/min, in the present embodiment
In, V0For 2mm/min.The first decrease speed and the second decrease speed that above-mentioned formula obtains are associated with outer diameter degree of fluctuation,
This side speed calculation formula can obtain reasonable speed, can be uniformly at gentle adjusting fluctuation so that in vitrifying
Outer diameter, to keep the outer diameter of preform more uniform, cored becomes smaller than fluctuation.
In the application, the calculation of outer diameter average value is：The summation of multiple repairing weld data is divided by sampling number.
When practice, in During Vitrification in vitro, Control for Kiln Temperature is at 1440 DEG C -1460 DEG C.In the present embodiment, Control for Kiln Temperature exists
1450℃。
When with this method, OVD deposition process carries out in OVD deposition reaction kettle, is provided in OVD deposition reaction kettle more
The flow of a blowtorch, each blowtorch is controlled by corresponding MFC, and each MFC is connect with PLC (programmable logic controller (PLC)).OVD is heavy
It is also equipped with outer diameter scanner in product reaction kettle, the guide rail of outer diameter scanner is parallel with the plug that loose media deposits, and outer diameter scans
In same level, outer diameter scanner can be moved back and forth along guide rail for instrument and plug, and setting in this way can guarantee outer diameter scanner
Accurate scan loose media outer diameter.Outer diameter scanner is connected with computer, and when work, scanning result is fed back to meter by outer diameter scanner
Result is fed back to PLC by calculating by calculation machine, computer, and PLC controls corresponding MFC, changes the flow of corresponding blowtorch.
OVD deposition process is as follows：Outer diameter scanner scanning loose media deposition outer diameter → by result feeds back to computer, calculates
Machine calculates outer diameter fluctuation, fluctuates less than 10%, continues to deposit according to prior art, once being greater than 10%, determines loose media maximum
The corresponding one or more blowtorch of outer radial position or minimum outer diameter position, → that result fed back to PLC → PLC control is corresponding
MFC (corresponds to the flow-reduction 2.5% that blowtorch is corresponded at maximum outside diameter there are two when blowtorch, two blowtorch respectively reduce
1.25%) (corresponding there are two when blowtorch, two blowtorch that, or by the gas flow for corresponding to blowtorch at minimum outer diameter improve 2.5%
It is each to improve 1.25%) → after continuing loose media deposition 10min → to continue to scan on loose media outer diameter, until gas flow changes
15%, stopping continues to correct, and otherwise persistently adjusts, until the work scanning of outer diameter scanner is heavy after deposition terminates → deposits
Loose media outer diameter after product, and present the result to computer → computer and obtain final largest outside diameter value Dmax, final outer
Diameter minimum value Dmin, final outer diameter mean value Da, the position S of final largest outside diameter valuemax, the position S of final minimum outer diameter valuemin。
In the present embodiment, in S1 step, the flow of No. 3 blowtorch is adjusted in total, and No. 3 times blowtorch is all different, and is adjusted every time
2.5%；In S2 step, loose media outer diameter is scanned after deposition, obtains final largest outside diameter value Dmax=310mm, it is corresponding
Position Smax=1200mm, final minimum outer diameter value Dmin=285mm, corresponding position Smin=1600mm, final outer diameter mean value Da
=298mm；Pass through formula V1=V0-(Dmax-Da)/100 obtain the first decrease speed V1=1.88mm/min passes through formula V2=
V0+(Da-Dmin)/100 obtain the second decrease speed V2=2.13mm/min；In the S3 step, with V0=2mm/min's is original
Decrease speed carries out vitrifying, wherein at 1150-1250mm, decrease speed is adjusted to V1(1.88mm/min), in 1550-
At 1650mm, decrease speed is adjusted to V2(2.13mm/min).It is 2.8%, P that the fluctuation of optical fiber prefabricating rod outside diameter is measured after vitrifying
Rate (outer diameter and core diameter ratio) range is 14.7-15.3.
In this method, the chemical temperatures of loose media deposition are almost the same, therefore each position loose media settled density is more evenly,
It is more advantageous to vitrifying to stablize, is further corrected by vitrifying, can greatly improve uniform external diameter, loose media part end to end
Cracking phenomena also weakened, qualified loose body length increases, and improves plug utilization rate.This method passes through control flow
Change total amount, come guarantee loose media deposition density uniformity, because if changes in flow rate be more than upper limit value (15%) after, just not
It can be corrected and be fluctuated by vitrifying well.
This method can guarantee optical fiber prefabricating rod outside diameter more evenly, and outer diameter fluctuation can be reduced to 2.5%, P rate from 5%
(outer diameter and core diameter ratio) is more stable, and P rate fluctuation range is reduced into 14.7-15.4 by 14.5-15.6, while single prefabricated rods
Qualified Length can reach 1900mm or more, and in part end to end, each 50mm that increases (increases 100mm qualification compared with the prior art
Length), plug utilization rate and prefabricated rods qualification rate are increased, cracking phenomena end to end is reduced, every stick increases 5.5% weight
Qualification rate.
The above description is only a preferred embodiment of the present invention, not thereby limits scope of patent protection of the invention, all
It is directly or indirectly to be used in other relevant technologies with equivalent structure transformation made by description of the invention and accompanying drawing content
Field similarly includes within the scope of the present invention.
Claims (10)
1. a kind of manufacturing method of preform, which is characterized in that include the following steps：
In carrying out OVD deposition process, periodically scans for loose media outer diameter and calculate the outer diameter fluctuation of loose media, whenever outer diameter
When fluctuation is greater than preset range, blowtorch corresponding to maximum outside diameter is adjusted, makes the flow of blowtorch corresponding to maximum outside diameter by default
Ratio reduces, or blowtorch corresponding to adjustment minimum outer diameter, increases the flow of blowtorch corresponding to minimum outer diameter by preset ratio
Add；
After deposition, loose media outer diameter is scanned, obtains the final largest outside diameter value of loose media, final minimum outer diameter value, most
Position at whole outer diameter mean value, and corresponding largest outside diameter and at minimum outer diameter, according to final largest outside diameter value, final outer diameter
Minimum value and final outer diameter mean value computation go out the first decrease speed and the second decrease speed；
Vitrifying is carried out to loose media, wherein in from the pre-determined distance at largest outside diameter, loose media is pressed under the first decrease speed
Drop, in from the pre-determined distance at minimum outer diameter, loose media is declined by the second decrease speed, and loose media rest part is according to original
Decrease speed decline, wherein the first decrease speed is less than original decrease speed, and original decrease speed is less than the second decrease speed.
2. the manufacturing method of preform as described in claim 1, which is characterized in that the outer diameter of a cycle fluctuates dfMeter
Calculation method is：df=(dmax-dmin)/d*100%, wherein dmaxFor the loose media largest outside diameter value that current period scans, dmin
For the loose media minimum outer diameter value that current period scans, d is the loose media outer diameter average value that current period scans.
3. the manufacturing method of preform as claimed in claim 2, which is characterized in that outer diameter fluctuation preset range be
7%~13%；The scan period of loose media outer diameter is 7~13 minutes.
4. the manufacturing method of preform as described in claim 1, which is characterized in that the flow of blowtorch is dropped by preset ratio
It is low, specially：It is reduced in proportion by preset ratio containing silicon material, fuel gas, combustion-supporting gas and the flow for assisting gas；Spray
The flow of lamp is increased by preset ratio, specially：Increase in proportion by preset ratio containing silicon material, fuel gas, combustion-supporting gas
The flow of body and auxiliary gas.
5. the manufacturing method of preform as claimed in claim 4, which is characterized in that the preset ratio be 2%~
3%.
6. the manufacturing method of preform as claimed in claim 5, which is characterized in that blowtorch flow and initial flow phase
Than stopping flow and adjusting when flow changes ratio more than or equal to upper limit value；The upper limit value is 13%~17%.
7. the manufacturing method of preform as claimed in claim 6, which is characterized in that the preset ratio is 2.5%, institute
Stating upper limit value is 15%.
8. the manufacturing method of preform as described in claim 1, which is characterized in that the pre-determined distance be 40mm~
60mm。
9. the manufacturing method of preform as described in claim 1, which is characterized in that the first decrease speed V1=V0-
(Dmax-Da)/100, the second decrease speed V2=V0+(Da-Dmin)/100, wherein V0For original decrease speed, DmaxFor final outer diameter
Maximum value, DminFor final minimum outer diameter value, DaFor final outer diameter mean value.
10. the manufacturing method of preform as described in claim 1, which is characterized in that in During Vitrification in vitro, Control for Kiln Temperature
At 1440 DEG C -1460 DEG C；The scanning of loose media outer diameter, and the guide rail and loose media of outer diameter scanner are carried out by outer diameter scanner
The plug of deposition is parallel.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110526573A (en) * | 2019-08-28 | 2019-12-03 | 烽火通信科技股份有限公司 | A kind of intelligence control system and method for OVD manufacture preform |
| CN114507006A (en) * | 2022-03-02 | 2022-05-17 | 武汉烽火锐拓科技有限公司 | Production system of OVD (over-the-counter) deposition process and OVD deposition process |
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| CN107867798A (en) * | 2016-09-22 | 2018-04-03 | 贺利氏石英玻璃有限两合公司 | The method that optical blank is produced from synthetic quartz glass |
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| CN107867798A (en) * | 2016-09-22 | 2018-04-03 | 贺利氏石英玻璃有限两合公司 | The method that optical blank is produced from synthetic quartz glass |
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| CN110526573A (en) * | 2019-08-28 | 2019-12-03 | 烽火通信科技股份有限公司 | A kind of intelligence control system and method for OVD manufacture preform |
| CN114507006A (en) * | 2022-03-02 | 2022-05-17 | 武汉烽火锐拓科技有限公司 | Production system of OVD (over-the-counter) deposition process and OVD deposition process |
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