CN110217975B - Method and device for drawing optical glass bar - Google Patents
Method and device for drawing optical glass bar Download PDFInfo
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- CN110217975B CN110217975B CN201910582357.8A CN201910582357A CN110217975B CN 110217975 B CN110217975 B CN 110217975B CN 201910582357 A CN201910582357 A CN 201910582357A CN 110217975 B CN110217975 B CN 110217975B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/04—Re-forming tubes or rods
- C03B23/11—Reshaping by drawing without blowing, in combination with separating, e.g. for making ampoules
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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 belongs to the technical field of optical glass secondary forming, and particularly discloses a drawing method and a drawing device for an optical glass bar, aiming at solving the problem that the existing optical glass bar secondary forming method cannot continuously produce the optical glass bar. According to the drawing method of the optical glass rod material, the first connecting part and the second connecting part which are matched are respectively processed at the front end and the rear end of the glass mother rod, so that in the drawing process, the glass mother rod to be drawn is sequentially connected with the second connecting part at the rear end of the last glass mother rod in the drawing device through the first connecting part at the front end of the glass mother rod, and the process is repeated, continuous feeding production is achieved, the time waste of the alternate process of the two glass mother rods is avoided, the preheating time of the glass mother rod is effectively shortened, the efficiency of continuous drawing production of the glass mother rod is high, and the material utilization rate and the product yield are improved.
Description
Technical Field
The invention belongs to the technical field of optical glass secondary forming, and particularly relates to a drawing method and device for an optical glass bar.
Background
Utilization of materials has been an important indicator of customer concern. Optical glass rod materials are more and more favored by optical element processing factories due to the extremely high material utilization rate; the equipment and personnel investment in the strip material cutting and rounding process can be avoided, and the production cost is greatly reduced. At present, all the secondary forming of optical glass bar materials or the production of optical fibers are carried out by feeding and preheating a glass mother rod product, then softening and drawing, and feeding, preheating, softening and drawing of the next glass mother rod are carried out only after the drawing of the previous glass mother rod is finished; and because the production process is discontinuous, more preheating time is needed for feeding and preheating the next glass mother rod, so that the production efficiency is low.
Disclosure of Invention
The invention provides a drawing method of an optical glass bar, and aims to solve the problem that the conventional optical glass bar secondary forming method cannot continuously produce the optical glass bar.
The technical scheme adopted by the invention for solving the technical problems is as follows: the drawing method of the optical glass bar comprises a raw material pretreatment step and a bar drawing step;
the method comprises the following steps of: respectively processing a first connecting part and a second connecting part at the front end and the rear end of the glass mother rod, wherein the first connecting part is in a structure of a threaded hole, an external thread, a dovetail-shaped groove or boss, an inverted T-shaped groove or boss and a triangular groove or boss, and the second connecting part is matched with the first connecting part;
a bar drawing step: putting the glass mother rod or the glass mother rod assembly into a drawing device for drawing; the glass mother rod assembly is composed of more than two glass mother rods with the ends connected together; in the drawing process, the glass mother rod to be drawn is connected with the second connecting part at the rear end of the last glass mother rod in the drawing device through the first connecting part at the front end of the glass mother rod in sequence, so that continuous feeding production is realized.
Further, in the rod material drawing step, the glass mother rod to be drawn is connected to the last glass mother rod in the drawing device before the last glass mother rod in the drawing device is preheated.
The invention also provides a drawing device for optical glass bar stock for realizing the drawing method, which comprises an upper traction device, a preheating furnace, a softening furnace and a lower traction device;
the upper end and the lower end of the preheating furnace are respectively provided with a feeding hole and a discharging hole;
the upper end of the softening furnace is provided with a feeding part, the lower end of the softening furnace is provided with a circular discharging part, and the cross section size of the discharging part of the softening furnace is smaller than that of the feeding part;
the upper traction device is arranged on the upper side of the preheating furnace and corresponds to a feed inlet of the preheating furnace, the feeding part of the softening furnace is connected with a discharge outlet of the preheating furnace, and the lower traction device is arranged on the lower side of the softening furnace and corresponds to a discharge part of the softening furnace.
Further, the upper traction device comprises a first roller set and a second roller set which are symmetrically arranged, and a gap part between the first roller set and the second roller set is positioned right above a feed inlet of the preheating furnace; the lower traction device comprises a first pull roll and a second pull roll which are symmetrically arranged, and a gap part between the first pull roll and the second pull roll is positioned under a discharging part of the softening furnace.
Further, a partition plate is arranged between the preheating furnace and the softening furnace.
Furthermore, a telescopic hole structure is arranged at the discharging part of the softening furnace.
Further, the lower side of the softening furnace is also provided with a diameter measuring instrument, a measuring end of the diameter measuring instrument corresponds to the position under the discharging position of the softening furnace, and the distance between the measuring end of the diameter measuring instrument and the discharging position of the softening furnace is 5-30 mm.
Further, the device also comprises a cutting device; the cutting tool of the cutting device is positioned at the lower side of the lower traction device.
Further, the traction speed V of the upper traction device1Traction speed V with lower traction means2The relationship between them should satisfy the following formula:
in the formula, R1Is the diameter of the glass master rod, R2The diameter of the drawn glass rod; beta is a control coefficient, and beta is more than or equal to 0.1 and less than or equal to 1.5.
The invention has the beneficial effects that: through processing first connecting portion of assorted and second connecting portion respectively at the front and back both ends of glass mother stick, so that in the drawing process, the glass mother stick that will treat the drawing is connected with the second connecting portion of last glass mother stick rear end in the drawing device through the first connecting portion of its front end in proper order, and is repeated, realize throwing material production in succession, the time waste of two glass mother stick alternating process has been avoided, and the preheating time of next glass mother stick has effectively been shortened, the production glass son stick of continuous drawing is not only efficient, but also the utilization ratio of material and the yields of product have been improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an optical glass rod drawing apparatus according to the present invention;
labeled as: the glass rod drawing device comprises an upper drawing device 100, a first roller group 110, a second roller group 120, a preheating furnace 200, a partition plate 210, a softening furnace 300, a telescopic hole structure 310, a lower drawing device 400, a first drawing roller 410, a second drawing roller 420, a cutting device 500, a cutting tool 510, a glass mother rod 600, a first connecting part 610, a second connecting part 620 and a glass sub-rod 700.
Detailed Description
The invention is further described below with reference to the figures and examples.
The drawing method of the optical glass bar comprises a raw material pretreatment step and a bar drawing step;
the method comprises the following steps of: processing a first connecting part 610 and a second connecting part 620 at the front end and the rear end of the glass mother rod 600 respectively, wherein the second connecting part 620 is matched with the first connecting part 610, as shown in fig. 1;
a bar drawing step: putting the glass mother rod 600 or the glass mother rod assembly into a drawing device for drawing; the glass mother rod assembly is composed of more than two glass mother rods 600 with the ends connected together; in the drawing process, the glass mother rod 600 to be drawn is connected with the second connecting part 620 at the rear end of the last glass mother rod 600 in the drawing device through the first connecting part 610 at the front end of the glass mother rod, so that continuous feeding production is realized.
The moving direction of the glass mother rod 600 drawn by the drawing force during the drawing process is taken as the front direction, and the direction opposite to the front direction is taken as the rear direction.
Through continuous feeding production, the problem of time waste of the alternate process of the two glass mother rods 600 does not exist, and along with the drawing of the former glass mother rod 600 is nearly completed, the latter glass mother rod 600 is preheated and enters the softening furnace 300 for softening, and is in the drawing preparation stage, so that the glass mother rods 700 can be continuously drawn and produced, and the preheating time of the next glass mother rod 600 can be effectively shortened in the whole process.
The first connecting portion 610 and the second connecting portion 620 can be connected in a matching manner, and it is required to ensure that the connection is pulled in the axial direction and cannot be separated; the first connection portion 610 and the second connection portion 620 may have various structures, for example: threaded holes, external threads, dovetail-shaped grooves or bosses, inverted T-shaped grooves or bosses, triangular grooves or bosses, and the like.
In order to ensure the continuity of the feeding, in the rod drawing step, the mother glass rod 600 to be drawn is preferably connected to the last mother glass rod 600 in the drawing apparatus before the last mother glass rod 600 in the drawing apparatus is preheated.
As shown in fig. 1, the drawing device for optical glass rod material is used for implementing the above-mentioned drawing method for optical glass rod material; comprises an upper traction device 100, a preheating furnace 200, a softening furnace 300 and a lower traction device 400;
the upper end and the lower end of the preheating furnace 200 are respectively provided with a feeding hole and a discharging hole;
the upper end of the softening furnace 300 is provided with a feeding part, the lower end of the softening furnace is provided with a circular discharging part, and the cross section size of the discharging part of the softening furnace 300 is smaller than that of the feeding part;
the upper traction device 100 is disposed at the upper side of the preheating furnace 200 and corresponds to a feed inlet of the preheating furnace 200, a feed portion of the softening furnace 300 is connected to a discharge outlet of the preheating furnace 200, and the lower traction device 400 is disposed at the lower side of the softening furnace 300 and corresponds to a discharge portion of the softening furnace 300.
The upper traction device 100 is mainly used for drawing and righting the glass mother rod 600 or the glass mother rod assembly put into the drawing device, so that the glass mother rod 600 or the glass mother rod assembly can smoothly enter the preheating furnace 200 for preheating, and particularly the glass mother rod assembly is mainly composed of more than two glass mother rods 600 with connected end parts, so that the two glass mother rods 600 with connected end parts can be prevented from generating dislocation under the righting effect of the upper traction device 100.
The upper drawing device 100 generally comprises a plurality of drawing rolls, and specifically, the upper drawing device 100 comprises a first roll group 110 and a second roll group 120 which are symmetrically arranged, and a gap part between the first roll group 110 and the second roll group 120 is positioned right above a feed inlet of the preheating furnace 200.
In order to further enhance the traction and centralization effect of the upper traction device 100 on the glass parent rod assembly, it is preferable that the first roller set 110 comprises at least two first traction rollers spaced up and down, and the second roller set 120 comprises at least two second traction rollers spaced up and down, as further described in fig. 1.
In order to ensure that the pulling rolls have sufficient friction and are not affected by the preheating temperature of the preheating furnace 200, the first pulling roll and the second pulling roll are usually made of materials with high friction coefficient and high temperature resistance.
The preheating furnace 200 is mainly used for preheating the glass mother rod 600 and generally comprises a preheating furnace body and a heating element arranged in the furnace wall of the preheating furnace body; in order to improve the preheating effect and the service life of the preheating furnace 200, a silicon carbide furnace core is usually arranged on the inner wall of the preheating furnace body.
The softening furnace 300 is mainly used for softening the preheated glass mother rod 600 so as to perform secondary drawing molding on the glass mother rod; the softening furnace 300 generally includes a softening furnace body having a cylindrical inner cavity upper portion and a conical inner cavity lower portion; the softening furnace body is usually made of platinum materials, and the softening furnace can be heated by adopting a direct heating mode. The diameter of the hole at the discharge portion of the lower end of the softening furnace 300 should not be less than the maximum diameter of the formed glass sub-rod 700.
In order to avoid interference between preheating furnace 200 and softening furnace 300, it is preferable that partition 210 is provided between preheating furnace 200 and softening furnace 300, as shown in fig. 1. The separator 210 is generally made of a material resistant to high temperature and corrosion, such as: corundum mullite.
In order to facilitate the control of the diameter of the shaped glass sub-rod 700, a telescopic hole structure 310 is generally provided at the discharge portion of the softening furnace 300. The diameter of the telescopic hole structure 310 can be adjusted according to the diameter of the glass sub-rod 700 to be formed.
Preferably, a diameter measuring instrument is further arranged on the lower side of the softening furnace 300, a measuring end of the diameter measuring instrument corresponds to the position right below the discharging position of the softening furnace 300, and the distance between the measuring end of the diameter measuring instrument and the discharging position of the softening furnace 300 is 5-30 mm. The diameter measuring instrument can detect the diameter of the glass sub-rod 700 and transmit the detection result to the control center, if the actual diameter fluctuation of the glass sub-rod 700 exceeds 0.5mm, the control center controls the corresponding expansion or reduction of the aperture of the telescopic hole structure 310, the distance between the periphery of the glass sub-rod 700 and an outlet part is fixed, the temperature of the softening furnace 300 is stabilized, and the problem that the temperature fluctuation is large to influence the stability of the diameter of the glass sub-rod 700 due to overlarge gap is avoided. The diameter measuring instrument can be various, and is preferably a laser diameter measuring instrument.
The lower traction device 400 is mainly used for producing the glass rod 700 by traction drawing; the structure may be various, and is preferably the structure shown in fig. 1, that is, the lower traction device 400 includes a first pulling roll 410 and a second pulling roll 420 which are symmetrically arranged, and a gap portion between the first pulling roll 410 and the second pulling roll 420 is located right below a discharging portion of the softening furnace 300. By adjusting the rotation speed of the first drawing roll 410 and the second drawing roll 420, the drawing speed of the lower drawing device 400 can be adjusted. In order to avoid scratching the surface of the formed glass sub-rod 700, the first pulling roll 410 and the second pulling roll 420 are usually made of rubber materials.
Preferably, the drawing device for optical glass rod material further comprises a cutting device 500; the cutting blade 510 of the cutting device 500 is located at the lower side of the lower traction device 400. The cutting device 500 is adjusted in a vertical direction in linkage with the lower traction device 400; the cutting device 500 may be various, preferably a magnetic spring type cutter; the magnet of magnetism spring cutter when circular telegram with the cutter absorption on the magnet, the sustainable downwardly extending of glass stick 700, when reaching the settlement length, the magnet outage, the cutter is at spring action lower quick cut-off glass stick 700 to adsorb the normal position when the magnet circular telegram.
The upper pulling device 100 and the lower pulling device 400 have certain linkage, and are generally adjusted according to the inverse relationship between the diameter of the glass sub-rod 700 and the diameter of the glass mother rod 600.
As a preferable mode of the drawing apparatus for an optical glass rod material in the present invention, the drawing speed V of the upper drawing device 1001Traction speed V with the lower traction device 4002The relationship between them should satisfy the following formula:
in the formula, R1Is the diameter, R, of the glass parent rod 6002The diameter of the drawn glass sub-rod 700; beta is a control coefficient, and beta is more than or equal to 0.1 and less than or equal to 1.5.
In production, the diameter R of the glass sub-rod 700 is generally input according to the diameter requirement of the glass sub-rod 700 to be drawn2And the diameter R of the glass parent rod 600 is inputted after measuring the diameter of the glass parent rod 6001Then inputting an empirical value V2And beta, the traction speed V of the upper traction device 100 is calculated by the control center1And (5) carrying out production control.
In order to improve the temperature control effect on the preheating furnace 200 and the softening furnace 300, the preheating furnace 200 and the softening furnace 300 are respectively controlled by using independent temperature control systems. For example: a first temperature measuring element and a second temperature measuring element are respectively arranged on the outer surface of the furnace wall of the preheating furnace 200 and the outer surface of the furnace wall of the softening furnace 300, and the first temperature measuring element and the second temperature measuring element are respectively and electrically connected with a preheating furnace temperature controller and a softening furnace temperature controller. The control center automatically adjusts the traction speed and the corresponding beta value according to the temperature of the preheating furnace 200, the temperature of the softening furnace 300 and the diameter of the glass rod 700 to be drawn fed back by the first temperature measuring element and the second temperature measuring element, if the temperature of the softening furnace 300 is reduced, the viscosity is calculated by a microcomputer of the control center according to a viscosity change curve recorded in advance of the product if the temperature of the softening furnace 300 is reducedAutomatically reducing the towing speed V of the lower towing means 400 as the case may be2And the diameter of the glass sub-rod 700 is ensured to be in a qualified range.
Examples
According to the method and the device provided by the invention, an H-ZF52 optical glass bar with the specification of phi 40mm multiplied by 600-1000 mm is used as a glass mother rod 600, and a glass sub-rod 700 with the specification of phi (5 +0.4) mm multiplied by 500mm is drawn and produced.
In operation, a glass parent rod assembly formed by two glass parent rods 600 with connected ends is loaded from the upper traction device 100 and is pressed by the first roller set 110 and the second roller set 120, and the rolling speed of the first traction roller and the second traction roller is according to the traction speed V of the lower traction device 4002Determining that the glass parent rod 600 is preheated at 700 ℃ in the preheating furnace 200, then continuously moves downwards under the traction action of the upper traction device 100, the first glass parent rod 600 enters the softening furnace 300, is softened at the softening temperature of 800 ℃, flows out under the influence of self gravity to be molded into the glass sub-rod 700 and enters the lower traction device 400, the first pull roll 410 and the second pull roll 420 of the lower traction device 400 clamp the glass sub-rod 700 to roll downwards, the glass sub-rod 700 is always drawn downwards, then the temperature of the softening furnace 300 and the aperture of the telescopic hole structure 310 are adjusted according to the specification of the sub-rod phi 5+0.4mm, so that the diameter of the glass sub-rod 700 is in the range, the glass sub-rod 700 continuously moves downwards, when the glass sub-rod reaches the cutting device 500, the glass sub-rod 700 is automatically cut according to the downwards traction rate and the 500mm length required by the product, and a product meeting the contract requirement is obtained, the package can be directly checked; in the drawing process, the glass mother rod 600 to be drawn is connected with the second connecting part 620 at the rear end of the last glass mother rod 600 in the drawing device through the first connecting part 610 at the front end of the glass mother rod, so that continuous feeding production is realized.
Because the first glass mother rod 600 and the second glass mother rod 600 are matched together, when the first glass mother rod 600 finishes drawing, the second glass mother rod 600 matched with the first glass mother rod is preheated and enters the softening furnace 300, when the first glass mother rod 600 finishes drawing, the second glass mother rod 600 starts drawing and forming, the third glass mother rod 600 finishes matching with the second glass mother rod 600 in the upper traction device 100, and the feeding production is repeated; in the whole process, the processes and equipment such as preheating, softening and the like do not need to be adjusted, and the glass sub-rod 700 product with the specification of phi (5 +0.4) mm multiplied by 500mm can be continuously obtained, so that the production time is greatly shortened, and the production efficiency and the product yield are improved.
Claims (9)
1. The drawing method of the optical glass bar is characterized by comprising the following steps: comprises a raw material pretreatment step and a bar drawing step;
the method comprises the following steps of: respectively processing a first connecting part (610) and a second connecting part (620) at the front end and the rear end of a glass mother rod (600), wherein the first connecting part (610) is in a structure of a threaded hole, an external thread, a dovetail-shaped groove or boss, an inverted T-shaped groove or boss and a triangular groove or boss, and the second connecting part (620) is matched with the first connecting part (610);
a bar drawing step: putting a glass mother rod (600) or a glass mother rod assembly into a drawing device for drawing; the glass mother rod assembly is composed of more than two glass mother rods (600) with the ends connected together; in the drawing process, the glass mother rod (600) to be drawn is sequentially connected with the second connecting part (620) at the rear end of the last glass mother rod (600) in the drawing device through the first connecting part (610) at the front end of the glass mother rod, so that continuous feeding production is realized.
2. A method for drawing an optical glass rod as claimed in claim 1, wherein: in the rod material drawing step, before the last glass mother rod (600) in the drawing device finishes preheating, the glass mother rod (600) to be drawn is connected to the last glass mother rod (600) in the drawing device.
3. A drawing device for an optical glass rod material for realizing the drawing method for an optical glass rod material according to claim 1 or 2; the method is characterized in that: comprises an upper traction device (100), a preheating furnace (200), a softening furnace (300) and a lower traction device (400);
the upper end and the lower end of the preheating furnace (200) are respectively provided with a feeding hole and a discharging hole;
the upper end of the softening furnace (300) is provided with a feeding part, the lower end of the softening furnace is provided with a circular discharging part, and the cross section size of the discharging part of the softening furnace (300) is smaller than that of the feeding part;
the upper traction device (100) is arranged on the upper side of the preheating furnace (200) and corresponds to a feeding hole of the preheating furnace (200), a feeding part of the softening furnace (300) is connected with a discharging hole of the preheating furnace (200), and the lower traction device (400) is arranged on the lower side of the softening furnace (300) and corresponds to a discharging part of the softening furnace (300).
4. A drawing apparatus for an optical glass rod as claimed in claim 3, wherein: the upper traction device (100) comprises a first roller set (110) and a second roller set (120) which are symmetrically arranged, and a gap part between the first roller set (110) and the second roller set (120) is positioned right above a feed inlet of the preheating furnace (200); the lower traction device (400) comprises a first pull roll (410) and a second pull roll (420) which are symmetrically arranged, and a gap part between the first pull roll (410) and the second pull roll (420) is positioned right below a discharging part of the softening furnace (300).
5. A drawing apparatus for an optical glass rod as claimed in claim 3, wherein: a partition plate (210) is arranged between the preheating furnace (200) and the softening furnace (300).
6. A drawing apparatus for an optical glass rod as claimed in claim 3, wherein: and a telescopic hole structure (310) is arranged at the discharging part of the softening furnace (300).
7. A drawing apparatus for an optical glass rod as claimed in claim 3, wherein: the lower side of the softening furnace (300) is further provided with a diameter measuring instrument, the measuring end of the diameter measuring instrument corresponds to the position under the discharging position of the softening furnace (300), and the distance between the measuring end of the diameter measuring instrument and the discharging position of the softening furnace (300) is 5-30 mm.
8. A drawing apparatus for an optical glass rod as claimed in claim 3, wherein: also comprises a cutting device (500); the cutting knife (510) of the cutting device (500) is located on the underside of the lower pulling device (400).
9. Drawing device for optical glass rod stock according to any of claims 3 to 8, characterised in that the drawing speed V of the upper drawing device (100) is such that it is constant1A traction speed V with the lower traction device (400)2The relationship between them should satisfy the following formula:
in the formula, R1Is the diameter, R, of the glass parent rod (600)2Is the diameter of the drawn glass sub-rod (700); beta is a control coefficient, and beta is more than or equal to 0.1 and less than or equal to 1.5.
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| CN111792820B (en) * | 2020-06-24 | 2022-12-23 | 江苏太平洋石英股份有限公司 | Process for producing large-size quartz glass plate by continuous melting method, quartz glass plate and application thereof |
| CN112919783A (en) * | 2021-02-22 | 2021-06-08 | 雅安格纳斯光电科技有限公司 | Optical glass bar hot forming process and hot forming device thereof |
| 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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| CN105636915A (en) * | 2012-11-16 | 2016-06-01 | 康宁股份有限公司 | Method for fabricating continuous glass ribbons |
| CN103900914A (en) * | 2012-12-26 | 2014-07-02 | 核工业西南物理研究院 | Liquid helium temperature zone material three-point bending multi-sample continuous testing device |
| CN203833818U (en) * | 2014-05-15 | 2014-09-17 | 湖北新华光信息材料有限公司 | Optical glass bar drawing machine |
| CN204454862U (en) * | 2015-01-16 | 2015-07-08 | 中天科技精密材料有限公司 | The equipment of a kind of continuous high temperature extension and uninterrupted glass-cutting rod |
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