CN101289272A - Production method of profiled silex glass holding bar and apparatus - Google Patents
Production method of profiled silex glass holding bar and apparatus Download PDFInfo
- Publication number
- CN101289272A CN101289272A CNA2008101132017A CN200810113201A CN101289272A CN 101289272 A CN101289272 A CN 101289272A CN A2008101132017 A CNA2008101132017 A CN A2008101132017A CN 200810113201 A CN200810113201 A CN 200810113201A CN 101289272 A CN101289272 A CN 101289272A
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- CN
- China
- Prior art keywords
- special
- profiled
- holding bar
- glass holding
- silex glass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/04—Forming tubes or rods by drawing from stationary or rotating tools or from forming nozzles
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/021—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by induction heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a method for producing a special quartz glass holding stick and a device thereof. The raw material of quartz glass is first pulled to be a special stick blank with different diameters at the two ends; the special stick blank is then processed to be a special stick which is then done with flame polishing and precise annealing. The lower part of a melting furnace used for pulling the special stick blank is provided with a tapered feeding port the side wall of which has an induced angle of 30 degrees to 40 degrees with a horizontal plane and the diameter of which is 85 mm to 90 mm. The winding density at the lower part of a medium-frequency induction heating coil of the melting furnace is higher than that of the upper part thereof and the melting furnace adopts (medium-frequency induction) graphite for heating. The method of the invention leaves out the steps of welding of the special stick and annealing after the welding, which results in simple technology and improved production efficiency; additionally, products produced by the method has uniform inner texture and high bearing strength but no joints.
Description
Technical field
The present invention relates to a kind of optical fiber production starting material---the production technology of silex glass holding bar, relate in particular to a kind of production method and equipment of profiled silex glass holding bar.
Background technology
Along with the fast development of optical communication industry, the optical fiber production also develops rapidly thereupon.Two big technologies of the tool representative of optical fiber production are: emerging VAD technology and traditional MCVD technology.
Silex glass holding bar is a kind of expendable material that uses with the VAD process matching, and its specification framework is different.Wherein, the use of the special-shaped rod of big specification is particularly extensive, because silica glass softening temperature height, high temperature viscosity are big, the special-shaped excellent production difficulty of big specification is big, production cost is high.
As shown in Figure 1, a kind of big specification profiled silex glass holding bar of the prior art, its production method is:
At first, adopt High Temperature Furnaces Heating Apparatus to draw the quartz pushrod of different diameter respectively, the quartz pushrod of two kinds of specifications needs twice (stove) to draw; Then, under the oxyhydrogen thermal-flame with the welding of the blank of two kinds of different diameters rod.
Owing in the welding process, produced great thermal stresses in the weld, therefore needed in annealing furnace, anneal a few hours down at 1100-1200 ℃; Carry out precise cold, hot-work etc. afterwards.
There is following shortcoming at least in above-mentioned prior art:
Complex manufacturing, and because there is tangible textural defect in the weld, structural stress is big, loading strength is low.
Summary of the invention
The production method and the equipment that the purpose of this invention is to provide the profiled silex glass holding bar that a kind of production technique is simple, loading strength is high.
The objective of the invention is to be achieved through the following technical solutions:
The production method of profiled silex glass holding bar of the present invention comprises step:
At first, raw material of quartz glass sticked together is drawn into special-shaped excellent blank, and the diameter of excellent blank one end of described abnormal shape is greater than the diameter of the other end; Then, the excellent blank of described abnormal shape is processed into the special-shaped rod that needs shape.
The production unit of profiled silex glass holding bar of the present invention comprises smelting furnace, and the bottom of described smelting furnace is provided with the taper feed opening, and the sidewall of described taper feed opening and the angle of horizontal plane are 30～40 °.
As seen from the above technical solution provided by the invention, the production method of profiled silex glass holding bar of the present invention and equipment, be drawn into the different special-shaped excellent blank of two ends diameter owing at first raw material of quartz glass is sticked together, then the excellent blank of abnormal shape be processed into the special-shaped rod that needs shape.The sidewall of the taper feed opening of the bottom of the smelting furnace that stretching special-shaped rod is used and the angle of horizontal plane are 30～40 °, are used to realize the drawing of special-shaped excellent blank.Saved the annealing steps after welding and welding, made technology simple; And do not have interface in the product, endoplasm is even, loading strength is high.
Description of drawings
Fig. 1 is the structural representation of a kind of big specification profiled silex glass holding bar of the prior art;
Fig. 2 is the structural representation of the special-shaped excellent blank of method drawing of the present invention;
Fig. 3 is the structural representation of smelting furnace among the present invention.
Embodiment
The production method of profiled silex glass holding bar of the present invention, its preferable embodiment be as shown in Figure 2:
At first, raw material of quartz glass sticked together is drawn into special-shaped excellent blank, and the diameter of special-shaped excellent blank one end forms the special-shaped excellent blank of large and small end greater than the diameter of the other end;
Then, the excellent blank of abnormal shape is processed into the special-shaped rod that needs shape.Like this, both can avoid using the textural defect of the different blank rod welding generation of diameter; Can avoid again using the working special-shaped rod of major diameter blank rod causes must the low defective of material rate.
The excellent blank of described abnormal shape is processed into after the special-shaped rod that needs shape, also comprises the special-shaped rod after the processing is carried out flame polish.The purpose of flame polish operation is to eliminate the crackle on silica glass surface, strengthens holding bar intensity.But in thermal-flame when polishing,, the moment of glass surface temperature rises, and can produce very big surface stress, can produce bigger stress concentration at the stress concentration of tiny crack top end, causes bursting of rod.
The present invention at first used the HF acid soak to the special-shaped rod after the processing before carrying out described flame polish, passivation crackle angle reduces stress concentration intensity.
When carrying out described flame polish, can also at first carry out preheating to special-shaped rod, to reduce the tension stress that flame polish moment surface produces, reduce the danger of fried rod.
Special-shaped rod is carried out can also carrying out fine annealing to described special-shaped rod after the flame polish.When carrying out described fine annealing, many special-shaped rods are divided into multilayer and put in annealing furnace.As 20 in every stove, divide 4 layers or 5 layers to put etc.The convection current degree of air-flow in the burner hearth be can reduce, the pollution and the temperature difference that produce because of convection current reduced.Simultaneously, can also boost productivity.
When special-shaped rod carries out fine annealing in annealing furnace, its point of suppon can more than or equal 3, multi-point support can reduce span, produces crooked when avoiding annealing.
The diameter that the present invention can produce an end is 75～85mm; The diameter of the other end is the special-shaped excellent blank of 35～45mm.Diameter as an end is 80mm; The diameter of the other end is the special-shaped excellent blank of 40mm.Also can produce the special-shaped excellent blank of other size, the size of concrete special-shaped excellent blank can be determined according to the size of special-shaped rod, reserve process redundancy.
The production unit of profiled silex glass holding bar of the present invention, its preferable embodiment be as shown in Figure 3:
Comprise smelting furnace, the bottom of smelting furnace is provided with taper feed opening 1, and the angle α of the sidewall of taper feed opening 1 and horizontal plane can be 30～40 °, as 35 ° etc.Under this angle, raw material of quartz glass is sticked together be drawn into above-mentioned special-shaped excellent blank easily.
The diameter phi of taper feed opening 1 can be 85～90mm, and the size of the special-shaped excellent blank that draws according to need also can be selected other size for use.
Smelting furnace among the present invention comprises Frequency Induction Heating coil 3, Frequency Induction Heating coil 3 be wrapped in smelting furnace around, the winding density of Frequency Induction Heating coil 3 bottoms can be greater than the winding density on top, can make the temperature of the temperature of taper feed opening 1, realize drawing the temperature that special-shaped excellent blank needs easily greater than its top.
The heating element 2 of smelting furnace can adopt graphite heater.
Silica glass softening or temperature of fusion is very high and high temperature viscosity is very big, the too high silica glass of temperature at the discharge port place because of viscosity is low can't moulding or to cause the rod that is drawn to produce crooked, temperature is crossed low then silica glass and can't be drawn.And the molten usually quartz pushrod that widens diameter needs the melting capacity height of stove, and load is big; And the quartz pushrod that draws minor diameter needs the melting capacity of stove relatively low, and load is also less relatively, therefore moltenly widen, that minor diameter needs stove can satisfy melting capacity simultaneously in the special-shaped rod of one is high and low, the requirement that load is large and small.
The spiral that smelting furnace among the present invention is dredged on close under adopting in the distribution of induction coil curls mode; On the structure of feed opening through experimental selection α between the 30-40 degree; The diameter of phi of feed opening is chosen between the 85-90mm.This structure can satisfy and draws large and small diameter (as major diameter 80mm, minor diameter 40mm) and draw requirement in the profiled silex glass rod blank of one molten.The profiled silex glass rod blank that this smelting furnace draws out is through double refraction instrument qualitative detection, and the stress situation can satisfy cold worked requirement.
The present invention adopts the once processing method of molten pulling shaping, and compared with prior art, the present invention adopts the molten pull technology of intermediate frequency that special-shaped excellent blank is directly pulled out in the silica glass fusion at high temperature that sticks together, and has saved welding and annealing steps, and technology is simple; And do not exist interface, endoplasm evenly, not to have any textural defect in the product, improved the intensity of silex glass holding bar, improved greatly simultaneously process the material rate, process to such an extent that the material rate can reach 52～59%, be more than the twice of the prior art.Simultaneously, this technology is once shaped, has simplified technological process, has improved labour productivity, has reduced production cost.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (10)
1, a kind of production method of profiled silex glass holding bar is characterized in that, comprises step:
At first, raw material of quartz glass sticked together is drawn into special-shaped excellent blank, and the diameter of excellent blank one end of described abnormal shape is greater than the diameter of the other end; Then, the excellent blank of described abnormal shape is processed into the special-shaped rod that needs shape.
2, the production method of profiled silex glass holding bar according to claim 1 is characterized in that, the excellent blank of described abnormal shape is processed into after the special-shaped rod that needs shape, also comprises described special-shaped rod is carried out flame polish;
Before carrying out described flame polish, at first to described special-shaped rod HF acid soak.
3, the production method of profiled silex glass holding bar according to claim 2 is characterized in that, before carrying out described flame polish, also will carry out preheating to described special-shaped rod.
4, the production method of profiled silex glass holding bar according to claim 2 is characterized in that, described special-shaped rod is carried out also comprising described special-shaped rod being carried out fine annealing after the flame polish;
When carrying out described fine annealing technology, many described special-shaped rods are divided into multilayer and put in annealing furnace.
5, the production method of profiled silex glass holding bar according to claim 4 is characterized in that, the point of suppon of described special-shaped rod in annealing furnace more than or equal 3.
6, the production method of profiled silex glass holding bar according to claim 1 is characterized in that, the diameter of excellent blank one end of described abnormal shape is 75～85mm; The diameter of the other end is 35～45mm.
7, a kind of production unit of profiled silex glass holding bar comprises smelting furnace, it is characterized in that, the bottom of described smelting furnace is provided with the taper feed opening, and the sidewall of described taper feed opening and the angle of horizontal plane are 30～40 °.
8, the production unit of profiled silex glass holding bar according to claim 7 is characterized in that, the diameter of described taper feed opening is 85～90mm.
9, the production unit of profiled silex glass holding bar according to claim 7 is characterized in that, described smelting furnace comprises the Frequency Induction Heating coil, and the winding density of described Frequency Induction Heating coil bottom is greater than the winding density on top.
10, the production unit of profiled silex glass holding bar according to claim 7 is characterized in that, described smelting furnace comprises heating element, and described heating element is a graphite heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101132017A CN101289272A (en) | 2008-05-28 | 2008-05-28 | Production method of profiled silex glass holding bar and apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101132017A CN101289272A (en) | 2008-05-28 | 2008-05-28 | Production method of profiled silex glass holding bar and apparatus |
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| CN101289272A true CN101289272A (en) | 2008-10-22 |
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| CNA2008101132017A Pending CN101289272A (en) | 2008-05-28 | 2008-05-28 | Production method of profiled silex glass holding bar and apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013064495A1 (en) * | 2011-11-03 | 2013-05-10 | Continental Automotive Gmbh | Heating coil for an injection valve and injection valve |
| CN109671607A (en) * | 2017-10-17 | 2019-04-23 | 北京北方华创微电子装备有限公司 | The processing method and processing chamber of workpiece |
| CN110052899A (en) * | 2019-04-22 | 2019-07-26 | 湖州东科电子石英有限公司 | With the big ring polishing process of jagged quartz |
-
2008
- 2008-05-28 CN CNA2008101132017A patent/CN101289272A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013064495A1 (en) * | 2011-11-03 | 2013-05-10 | Continental Automotive Gmbh | Heating coil for an injection valve and injection valve |
| CN109671607A (en) * | 2017-10-17 | 2019-04-23 | 北京北方华创微电子装备有限公司 | The processing method and processing chamber of workpiece |
| CN109671607B (en) * | 2017-10-17 | 2021-12-17 | 北京北方华创微电子装备有限公司 | Method for processing workpiece and process chamber |
| CN110052899A (en) * | 2019-04-22 | 2019-07-26 | 湖州东科电子石英有限公司 | With the big ring polishing process of jagged quartz |
| CN110052899B (en) * | 2019-04-22 | 2020-04-28 | 湖州东科电子石英股份有限公司 | Polishing process of quartz large ring with notch |
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Open date: 20081022 |