CN103058504A - Manufacturing method of glass precast body for compression molding - Google Patents
Manufacturing method of glass precast body for compression molding Download PDFInfo
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- CN103058504A CN103058504A CN2011103221426A CN201110322142A CN103058504A CN 103058504 A CN103058504 A CN 103058504A CN 2011103221426 A CN2011103221426 A CN 2011103221426A CN 201110322142 A CN201110322142 A CN 201110322142A CN 103058504 A CN103058504 A CN 103058504A
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- glass
- compression molding
- preform
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Abstract
The invention discloses a simple method for manufacturing a glass precast body with high surface finish. The method comprises the following steps: (1) machining a cylindrical optical glass rod having a lateral surface with the high finish; and (2) preparing the glass precast body by using a hot machining method, i.e. preparing a fine glass rod with the required diameter and the high lateral surface finish in a drawing manner through an optical fibre drawing machine by utilizing the hot machining method, and cutting the fine glass rod into the required length in an online cutting manner during the drawing process, thereby obtaining the glass precast body for compression molding. The compression molding is carried out as follows: with the adoption of the traditional precise optical element for the compression molding, the lateral surface of the glass precast body is pressed by a mold during the mold pressing process, thereby forming a required optical element. As a result, the high surface finish of the optical element is achieved.
Description
Technical field
The present invention relates to the making method of glass preform, belong to precison optical component and make the field.
Background technology
In recent years, the developing direction of opticinstrument trends towards miniaturization, high performance, thereby impels the development of the optical element such as widely used lens in the opticinstrument also to require lightweight, miniaturization and high performance.Aspherical mirror is owing to making optical system have that good imaging quality, volume are little, lightweight, advantages of simple structure and simple, thereby has been subject to using widely.
At present, the aspherics lens mainly adopt advanced precise compression molding method manufacturing, and this kind method is under certain temperature and pressure, directly glass preform is pressed into the glasswork of required function by precision die.The opticglass compression molding method is made optical element and is had the following advantages: 1. do not need the operations such as traditional corase grind, correct grinding, polishing, edging center, just can make part reach higher dimensional precision, surface figure accuracy and surfaceness; 2. can save a large amount of production units, frock auxiliary material, plant area and masterful technique workman, make between a compact car just can possess very high productivity; 3. can be easy to realize economically the batch production of accurate aspheric surface optical accessory; 4. need only the processing parameters such as temperature and pressure of accurately controlling in the compression molding process, just can guarantee dimensional precision and the repeatable accuracy of compression molding optical element; 5. can mold pressing small aspherical lens arra; 6. optical element and reference for installation spare can be made an integral body.Therefore, the precise compression molding technology is widely used in a large amount of productions of the optical elements such as aspherical mirror.
The cardinal principle of glass mould pressing technology is to utilize glass with the characteristic of temperature rising reduced viscosity, the glass preform of making is in advance placed in the mould of precision sizing shaping, under suitable ambiance, temperature is raise between glass tansition temperature T
gBetween point and the softening temperature, exerting pressure by the die surface makes glass deformation, turns modeling benevolence shape, removes pressure, minute mould after the cooling, takes out finished product.The great advantage of compression molding is only to need disposal pressed moulding just can obtain the optical element that directly uses, and does not need to implement mechanical workout again.
Compression molding roughly is divided into three kinds with the shape of glass preform: cylindric, spherical and sphere is specular.In order to obtain the optical element surface of best bright finish, its corresponding prefabricated glass surface must reach or be higher than the smooth finish of required optical element in advance.Owing to being the form of sheet material when glass has just dispatched from the factory, before doing glass preform, need with plate cutting into strips, cut into again the square shape, chamfer at last rounding, make the crude green body of preform, crude green body need grind through cast iron plate usually, formality with the fine grinding of diamond mill correct grinding just can reach the form accuracy of preform and the standard of roughness.In the prior art, the cold worked methods such as main employing grinding and polishing, chunk glass from large specification, be made into the glass preform of small dimension, need multiple working procedure, both useless process period, increased again processing consumptive material and processing waste, and also expended a large amount of production costs and reduced production efficiency.
Summary of the invention
The objective of the invention is provides a kind of compression molding glass preform with simple method, and then the invention provides a kind of method by this glass preform pressed glass optical element.
For achieving the above object, best bright finish glass preform manufacture method feature of the present invention is as follows:
1, the manufacture craft process of glass preform is: (1) side surface has the manufacturing procedure of the cylindrical optic glass stick of best bright finish; (2) the standby glass preform operation of hot-work legal system is drawn into carefully rod of glass required diameter, the side surface best bright finish by fiber-pulling machine by hot worked method; In the pulling process the thin excellent cutting on line of glass is become required length, namely make the glass preform that compression molding is used.
2, according to 1 described manufacture method, glass preform is made of silicate glass, borate glass, phosphate glass, tellurate glass, bismuth germanate glass or chalcogenide glass.
3, according to 1 described manufacture method, the raw glass rod that has the best bright finish surface before the drawing is to adopt the glass block to be prepared from through the method for mechanical workout.
4, according to 1 described manufacture method, the raw glass rod that has the best bright finish surface before the drawing also can directly be poured glass metal into smooth inner wall surface cylinder mold by adopting, and is prepared from through annealing cooling and the demoulding.
5, according to 1 described manufacture method, the optical glass rod diameter before drawing is 3mm～50mm.
6, according to 1 described manufacture method, adopt fiber-pulling machine to regulate the diameter of optical glass rod, heating glass stick and the glass that is drawn into required diameter is rod carefully, mode by cutting on line obtains volume required glass preform, has guaranteed smooth finish that the prefabricated glass surface is high and the volume of uniformity.
7, according to 1 described manufacture method, adopt traditional mold pressing procedure moulding, in the mold process, mould forms required optical element by the side surface of pressed glass precast body, thereby makes optical element reach high surface smoothness.
Advantage of the present invention is: (1) formerly technology all adopts the cold technique such as cutting and polishing to process respectively to every glass preform, has extremely complicated and loaded down with trivial details manufacturing procedure; The present invention is by the disposable cylindrical glass rod that processes large-size, and adopts hot worked method to draw and cut out single glass preform by drawing wire machine, greatly simplified manufacturing procedure, saved the time; (2) in the hot procedure, only need to adjust Heating temperature, send rod or draw rate just can obtain required diameter, cutting frequency by the control cutters reaches required length, but whole course of processing automatic continuous production, without waste material, production efficiency and raw material availability have greatly been increased; (3) the glass stick side surface is not subjected to any contact in hot procedure, has guaranteed the cleanliness factor of glass preform, and because glass is subject to self capillary impact in softening process, has further improved the optical quality of prefabricated glass body side surface; (4) the prepared cylindrical precast body of hot-work need not to carry out surface finish, can obtain the glass elements of high optical quality by the press-molding preform side surface; (5) production cost significantly reduces; (6) production method of glass preform of the present invention has universality, is suitable for comprising the glass system of all moldable moulding such as silicate glass, borate glass, phosphate glass, tellurate glass, bismuth germanate glass and chalcogenide glass.
Description of drawings
Fig. 1 is the machining sketch chart of glass preform of the present invention.The modes of emplacement of glass preform when Fig. 2 is compression molding.
Embodiment
Below in conjunction with embodiment and accompanying drawing this patent is further specified.
The glass preform manufacturing procedure that is used for precise compression molding is carried out in two steps.
(1) large glass stick manufacturing procedure.To the structural glass material, by modes such as cutting and polishing, prepare the optical glass rod of large-size, the glass stick side surface carries out optical polish, and according to the size needs of optical element, glass stick is of a size of 3mm～50mm.
(2) glass preform manufacturing procedure.As shown in Figure 1,1 is large-sized optical glass rod, and 2 is heating unit, and 3 is thin glass stick, 4 towing mechanisms, and 5 is cutters, and 6 is glass preform, and 7 is container, and 8 is stationary installation.At first, large-size glass rod 1 is vertically fixed in the drawing wire machine process furnace by drawing wire machine stationary installation 8; Get over the slowly heating of 1cm place by 2 pairs of large glass sticks of drawing wire machine heating unit near low side, when temperature surpassed glass softening point, heating place glass stick was softening, and because action of gravity glass stick heating zone is tapered, stub bar falls and pulls out thin glass stick; Remove stub bar, clamp thin glass stick by drawing wire machine towing mechanism 4 and draw downwards; Then, regulate feeding speed, pulling speed and the Heating temperature of drawing wire machine, regulate the diameter of thin glass stick; Rotary cutters 5 are equipped with in the towing mechanism lower end, regulate clipping time by the speed of rotation of adjusting cutters, thereby reach required thin excellent length; Thin glass stick after the cutting is fallen into the container 7 of lower end, can obtain glass preform.
Glass preform is made optical element by precise compression molding, such as aspherical mirror, spherical mirror, lens arra etc.As shown in Figure 2,9 is upper cores, and 10 is glass preform, and 11 is lower die.Wherein, the prefabricated glass body side surface is horizontal, in the accurate die pressing process, and heating mould and glass preform, and make temperature between glass heat transition temperature T
gWith glass transition temperature T
sBetween, the internal surface of upper cores 9 and lower die 10 makes it to reach identical with the die surface shape by the side of extruding glass preform 10, can make high-precision optical element after the cooling gradually.
Below, utilize embodiment to further specify the present invention.
With lanthanum borate class (B
2O
3-La
2O
3Class contains the B of 21wt%
2O
3La with 35wt%
2O
3, T
gBe 580 ℃, T
sBeing 710 ℃) to make diameter be that 10mm, volume are 150mm to glass
3The aspherical mirror element, accurate die pressing is as follows with the production method of glass preform:
At first, to B
2O
3-La
2O
3The class glass material by modes such as cutting, grinding, polishings, is prepared the glass stick that diameter is 30mm, and the glass stick side surface carries out the high precision polishing.
(2) glass stick that processes is fixed in the drawing wire machine process furnace by the drawing wire machine clip vertical; By the drawing wire machine heating unit large glass stick is got over the temperature rise rate that 1cm sentences 2 ℃/min near low side and slowly be heated to 720～740 ℃, make glass stick softening, because action of gravity glass stick heating zone is tapered, stub bar falls to also pulling out thin glass stick; Remove stub bar, clamp thin glass stick by the drawing wire machine towing mechanism and draw downwards; Then, regulate feeding speed, pulling speed and the Heating temperature of drawing wire machine, regulate the diameter of thin glass stick, drawing out diameter is the thin glass stick of 5mm; Regulate clipping time by the speed of rotation of adjusting cutters, conversing the required length of glass preform according to the diameter of the volume of aspherical mirror and thin glass stick is 7.5mm; Thin glass stick after the cutting is fallen into the container of lower end, can obtain glass preform.
Glass preform is made aspherical mirror by precise compression molding.At first glass preform is put into mould, and the side is horizontal, in the accurate die pressing process, heating mould and glass preform, push the side of lanthanum borate glass preform by the internal surface of upper cores and lower die, make it to reach identical with the die surface shape, can make gradually the aspherical mirror of high surface accuracy after the cooling.
Mold pressing parameter will be according to thermal property and the viscosity of glass, and according to the lens specification and the shape that obtain, the accurate and high-precision profile that is copied into.The mold pressing parameter of setting is: molding temperature: 680 ℃, and molding pressure: 190～220kgf/cm
2, molding pressure load: 100～150kgf, calcining temperature: 530 ℃.Aspherical mirror surface smoothness after the mold pressing is good after testing.
Claims (7)
1. a compression molding is with the making method of glass preform, and it is characterized in that: (1) side surface has the manufacturing procedure of the cylindrical optic glass stick of best bright finish; (2) the standby glass preform operation of hot-work legal system is drawn into carefully rod of glass required diameter, the side surface best bright finish by fiber-pulling machine by hot worked method; In the pulling process the thin excellent cutting on line of glass is become required length, namely make the glass preform that compression molding is used.
2. manufacture method according to claim 1, it is characterized in that: above-mentioned glass preform is made of silicate glass, borate glass, phosphate glass, tellurate glass, bismuth germanate glass or chalcogenide glass.
3. manufacture method according to claim 1 is characterized in that: the glass stick that has the best bright finish surface before the drawing is to adopt the glass block to be prepared from through the method for mechanical workout.
4. manufacture method according to claim 1 is characterized in that: the glass stick that has the best bright finish surface before the drawing also can directly be poured glass metal into smooth inner wall surface cylinder mold by adopting, and is prepared from through annealing cooling and the demoulding.
5. manufacture method according to claim 1 is characterized in that: the optical glass rod diameter before drawing is 3mm～30mm.
6. manufacture method according to claim 1, it is characterized in that: adopt fiber-pulling machine to regulate the diameter of optical glass rod, heating glass stick and the glass that is drawn into required diameter is rod carefully, mode by cutting on line obtains volume required glass preform, has guaranteed smooth finish that the prefabricated glass surface is high and the volume of uniformity.
7. manufacture method according to claim 1, it is characterized in that: adopt traditional mold pressing procedure moulding, in the mold process, mould forms required optical element by the side surface of pressed glass precast body, thereby makes optical element reach high surface smoothness.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103221426A CN103058504A (en) | 2011-10-21 | 2011-10-21 | Manufacturing method of glass precast body for compression molding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103221426A CN103058504A (en) | 2011-10-21 | 2011-10-21 | Manufacturing method of glass precast body for compression molding |
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| CN103058504A true CN103058504A (en) | 2013-04-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109704544A (en) * | 2019-01-07 | 2019-05-03 | 湖北新华光信息材料有限公司 | A kind of optical element blank prefabricated rods manufacturing device and element blank manufacturing method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3899315A (en) * | 1974-04-15 | 1975-08-12 | American Optical Corp | Method of making glass clad glass lenses |
| CN1408067A (en) * | 1999-11-10 | 2003-04-02 | 浜松光子学株式会社 | Manufacturing method of optical lens |
| CN1324330C (en) * | 2001-05-09 | 2007-07-04 | 浜松光子学株式会社 | Optical lens-use base material, optical lens, and production method for optical lens |
| CN101428963A (en) * | 2008-12-10 | 2009-05-13 | 中国科学院上海光学精密机械研究所 | Mould apparatus and method for manufacturing multicomponent glass optical fiber prefabricating stick |
| TW201041814A (en) * | 2009-03-20 | 2010-12-01 | Schott Ag | Master mold or preform for optical components |
-
2011
- 2011-10-21 CN CN2011103221426A patent/CN103058504A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3899315A (en) * | 1974-04-15 | 1975-08-12 | American Optical Corp | Method of making glass clad glass lenses |
| CN1408067A (en) * | 1999-11-10 | 2003-04-02 | 浜松光子学株式会社 | Manufacturing method of optical lens |
| CN1324330C (en) * | 2001-05-09 | 2007-07-04 | 浜松光子学株式会社 | Optical lens-use base material, optical lens, and production method for optical lens |
| CN101428963A (en) * | 2008-12-10 | 2009-05-13 | 中国科学院上海光学精密机械研究所 | Mould apparatus and method for manufacturing multicomponent glass optical fiber prefabricating stick |
| TW201041814A (en) * | 2009-03-20 | 2010-12-01 | Schott Ag | Master mold or preform for optical components |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109704544A (en) * | 2019-01-07 | 2019-05-03 | 湖北新华光信息材料有限公司 | A kind of optical element blank prefabricated rods manufacturing device and element blank manufacturing method |
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Addressee: Wang Guonian Document name: Notification of Passing Preliminary Examination of the Application for Invention |
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Application publication date: 20130424 |