CN1237017C - Pressure forming equipment and method for optical element - Google Patents
Pressure forming equipment and method for optical element Download PDFInfo
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- CN1237017C CN1237017C CN 00133892 CN00133892A CN1237017C CN 1237017 C CN1237017 C CN 1237017C CN 00133892 CN00133892 CN 00133892 CN 00133892 A CN00133892 A CN 00133892A CN 1237017 C CN1237017 C CN 1237017C
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/005—Pressing under special atmospheres, e.g. inert, reactive, vacuum, clean
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/66—Means for providing special atmospheres, e.g. reduced pressure, inert gas, reducing gas, clean room
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Abstract
The invention provides a press forming device for optical elements constituted to minimize the influence to be exerted on temperature control in a vacuum atmosphere to the least necessary extent by shortening a forming cycle when executing a forming method for evacuating the forming atmosphere only during pressing, and also provide the method for forming the same. The press forming device for pressing and forming heat and soft glass material by using a pair of upper and lower forming dies, cooling the glass material and taking out mould from die includes first hermetic chamber allowing atmosphere therein replacement; second hermetic chamber amounted in the first hermetic chamber allowing atmosphere therein replacement independently; forming device set for the second hermetic chamber; glass transferring means for delivering glass material in the first hermetic chamber to the forming device and delivering the glass products to the first hermetic chamber.
Description
Technical field
The present invention relates to a kind of pressure forming machine and forming method thereof that is used for the optical element that obtains by the hot glass material of compression molding.
Background technology
As the manufacture method of the glass lens that does not need polishing process, past attempts adopts a kind of heating glass material and with a pair of upper and lower mould it is carried out the method for compression molding.Because this method can be produced the product as the non-spherical lens effectively, is applied on the lens with different shape so it is developed.
In the method, how the molded surface of mould accurately being copied on the glasswork is a focal issue that obtains very accurate optical element.To achieve these goals, in pressing process, on the molding surface corresponding to the optical function surface of optical element of mould, a bit air can not be arranged.For this reason, for example when wanting convex lens of moulding, set the radius-of-curvature of glass material for radius-of-curvature, thereby between mould and glass, will can not leave air less than the molding surface of mould.
If produce, then can not only be molded into needed lens by the shape that changes glass material as the lens in the non-spherical lens with deep camber (radius-of-curvature is little) or complicated shape.Even can produce these lens, also can increase the cost of glass material.Therefore, Recent study has gone out a kind of elimination moulding air in compacting work so that form the method for vacuum state.According to this method, if keep vacuum state in the heating and cooling process of moulding process, the heat exchange (convection current) with air can not take place then yet.So, can prolong heating/cooling time, depend on that perhaps error can appear in the measured temperature of the difference of contact condition (having/very close to each other) aspect between mould and temperature sensor such as the thermopair.In addition, when handling glass material, can not clamp by vacuum and transport glass material.Like this, have many inconveniences and thereby be not satisfied in the method for constant vacuum state lower mould product.
Therefore, a kind of forming method that only forms vacuum state when pressing operation is favourable.In this case, increased the number of steps that in shaping cycle, vacuumizes with the filling rare gas element.Therefore, must shorten the time that vacuumizes with the filling rare gas element as much as possible exceedingly extends manufacture cycle so that prevent.In order to shorten shaping cycle, preferably under high as far as possible temperature, from mould, take out moulded product according to the mode identical with the situation in past.Therefore, must under inert gas atmosphere, take out moulded product in case oxidation.
To recall traditional molding device now.Disclose the invention of describing in 3-177318 number at Japanese Patent and proposed a kind of equipment that is used under inert gas atmosphere, carrying out molding.In this equipment, a mould and one are set in a forming cavity are used for glass material is installed to mould or the handle of discharging from mould.A load latch well is set in the forming cavity back.Glass material and moulded product are sent to the external world by the load latch well and ship from the external world, thereby the atmosphere ground that can not weaken in the forming cavity carries out the successive moulding.As a result, can at high temperature take out the moulded product after the moulding not oxidizedly, greatly shorten shaping cycle thus.
When using above-mentioned traditional molding device only to carry out forming the forming method of vacuum state in pressing process, following problem has appearred.Or rather, in this molding device since in mould, the handle that is used to load and unload moulded product and the mould and be positioned at a forming cavity from the glass material of mould etc., so that forming cavity becomes is bigger.Therefore, prolonged the pumpdown time that is used to remove air, this has correspondingly prolonged shaping cycle.In addition, the temperature control to mould and glass material becomes unstable in shaping cycle.
Thereby forming cavity must be as much as possible little.If above-mentioned handle only is arranged on outside the forming cavity, then in the time will loading and unloading glass material, mould is exposed in the external environment (atmosphere).In order to prevent the oxidation of mould, must after mould and glass moldings are sufficiently cooled, could take out them, therefore greatly prolonged shaping cycle.
Summary of the invention
In view of the foregoing, dreamed up the present invention.The pressure forming machine and the forming method thereof that the purpose of this invention is to provide a kind of optical element, wherein when only carrying out in pressing process setting molded atmosphere the forming method of vacuum for, shorten shaping cycle, thereby greatly reduced the disadvantageous effect that control produces to the temperature in vacuum atmosphere.
In order to address the above problem and realize above-mentioned purpose, be that it has following structure according to the feature of the pressure forming machine of optical element of the present invention.
Or rather, by adopt a pair of on, bed die comes under pressure distortion not only heat but also soft glass material, the pressure forming machine that cools off this glass material and take out the optical element of glass moldings from described mould comprises first closed cavities of a replaceable atmosphere wherein, one is contained in described first closed cavities and second closed cavities that can be independent of first closed cavities ground replacement atmosphere wherein, be the second closed cavities setting and be used for coming the shaped device of molded and shaped hot glass material and be used for a glass material that is contained in first closed cavities is sent to the described shaped device in second closed cavities and will be sent into the glass conveyer device of first closed cavities by the glass moldings of described shaped device moulding by pressurizeing.
A kind of pressure forming method according to optical element of the present invention is characterised in that it has following configuration.
Or rather, a kind of by adopt a pair of on, bed die comes the hot soft glass material of pressure forming, cool off this glass material and from described mould, take out the pressure forming method of the optical element of glass moldings, it is characterized in that, this method has adopted a kind of like this molding device, it is first closed cavities that described molding device comprises a replaceable atmosphere wherein, one is contained in described first closed cavities and can be independent of the described first closed cavities ground and replaces second closed cavities of atmosphere wherein and be used to replace described first closed cavities and the device of the atmosphere that second closed cavities is interior, said method comprising the steps of: glass material is packed in described first closed cavities; Before or after loading glass material, replace the internal atmosphere of described first closed cavities with inert condition; After above-mentioned replacement step, under inert condition, glass material is introduced in the described shaped device in described second closed cavities; After glass material being introduced described second closed cavities, at the described glass material of the second closed cavities internal heating; The inside of described second closed cavities is evacuated; By described molding device compression molding glass material; Behind the compression molding glass material, rare gas element is introduced in described second closed cavities; And at the described second closed cavities internal cooling moulded product; And after cooling step, take out moulded product by described first closed cavities.
Like this, when newly being provided with one around mould when having minimum required volumetrical chamber, can having only the atmosphere around the mould before compacting, to be set up into vacuum state, and can be the mould handling glass material under inert gas atmosphere.
According to one embodiment of present invention, in the pressure forming machine of an optical element, form one and can be independent of the glass load latch well that atmosphere is wherein replaced on the first closed cavities ground on a near position being positioned at first closed cavities, this load latch well can open wide and seal airtightly.As a result, have only the atmosphere of the less load latch well of volumetric ratio to be replaced, and do not change the atmosphere of its volume because of relative first closed cavitieies that increases such as glass conveyer devices, thus always can be to first closed cavities supply glass and from wherein taking out glass.
Description of drawings
To those skilled in the art, can be well understood to other feature and advantage except that above-mentioned feature and advantage according to following description to a preferred embodiment of the present invention.In specification sheets, describe with reference to the accompanying drawing that constitutes a specification sheets part, these accompanying drawings show an example of the present invention.But such example is not to have no to have exemplified out each embodiment of the present invention with omitting, therefore, in order to limit scope of the present invention, also will be referring to the content of the claims after specification sheets.
Fig. 1 is the longitudinal sectional view according to the pressure forming machine that is in the optical element under the pressing operation state of first embodiment of the invention;
Fig. 2 is the longitudinal sectional view that is in the pressure forming machine of the optical element under the glass filled state; And
Fig. 3 is the longitudinal sectional view according to the pressure forming machine of the optical element of second embodiment of the invention.
Embodiment
Below will the preferred embodiments of the present invention be described particularly referring to Fig. 1-3.Fig. 1 and 2 is the longitudinal sectional view according to the pressure forming machine of the optical element of first embodiment of the invention, and wherein Fig. 1 shows the state of pressure forming, and Fig. 2 shows the state of glass filled.Fig. 3 is the longitudinal sectional view according to the pressure forming machine of the optical element of second embodiment of the invention.
(first embodiment)
Referring to Fig. 1,2, exocoel 1 has the enclosed construction that is used to make its internal atmosphere and isolate from outer air.Sluice valve 13 is fixed in the import and export of exocoel 1 and can be opened and closed by a drive unit 21.A load latch well 3 is to form like this, promptly can make its tight contact sluice valve 13 and make it to break away from described sluice valve by a different drive unit 17.Can be set in the load latch well 3 by the support 12 of another different drive units 20 vertical shifting.
Thereby the lower surface of patrix 6 has the lip-deep molding surface that pressed glass material 9 is transferred to the ideal optical function surface glass material.Above the patrix 6 and outside exocoel 1, be provided with a drive unit 14 so that produce the pressure will be applied on the glass material 9, a upper boom 4 that is used to transmit pressure passes exocoel 1.In the top of cylindrical mould 8, be provided with a well heater 10 that is used to heat patrix 6.
A counterdie 7 can vertically be assemblied in the lower through-hole of cylindrical mould 8 slidably.
The upper surface of counterdie 7 has and is used for an ideal optical function surface is transferred to molding surface on the lower surface of glass material 9.Below counterdie 7 and outside exocoel 1, be provided with 15, one lower beams 5 that link to each other with this drive unit 15 of a drive unit and pass exocoel 1.In the bottom of cylindrical mould 8, be provided with the well heater 10 that another is used to heat counterdie 7.
In exocoel 1, around cylindrical mould 8 ground an inner chamber 2 is set, so that cover whole cylindrical mould, thereby make atmosphere wherein and the atmosphere of exocoel 1 is isolated opens.Inner chamber 2 can be independent of upper boom 4 ground and be moved by a drive unit 16 that is installed in outside the exocoel 1.When the lower opening of inner chamber 2 closely contacts with the bottom of exocoel 1, can form an enclosed space.
A handle 11 is set, so that glass material 9 and moulded product 29 are sent into inner chamber 2 or sent this inner chamber in exocoel 1.Can be installed in exocoel 1 outer drive unit 18 by one and make handle 11 rotations and make its vertical shifting, thereby can between counterdie 7 and support 12, transmit glass material 9 and moulded product 29 by a different drive unit 19.
Be respectively the nitrogen supply (NS) source and the vacuum exhaust source has been equipped with keying valve N0 and V0.For example, when the nitrogen valve N0 in nitrogen supply (NS) source closes and the nitrogen valve N1 of exocoel 1 and load latch well 3 and N3 when opening, exocoel 1 and load latch well 3 can communicate with each other, thereby exocoel and load latch well can be adjusted to the atmosphere with uniform pressure.
The process of coming moulded lens with the equipment with said structure below will be described.At first, as shown in Figure 1, be closed in the sluice valve 13 of the import and export of exocoel 1, make inner chamber 2 move to the position and open this inner chamber.Also open the nitrogen valve N0 in nitrogen supply (NS) source and the vacuum valve V0 in vacuum exhaust source.
In this state, the vacuum valve V1 of exocoel 1 is opened, so that exocoel is evacuated.When the inside of exocoel 1 reaches predetermined vacuum level, close vacuum valve V1.Subsequently, open the nitrogen valve N1 of exocoel 1, so that to its supply of nitrogen.When the inside of exocoel 1 reaches predetermined pressure, close nitrogen valve N1, so the atmosphere of having finished in the exocoel 1 is replaced.
The glass material 9 that will be arranged in exocoel 1 outside is sent into mould.At first, as shown in Figure 1, glass material 9 is delivered on the support 12 that waits outside exocoel 1 by an outdoor handle (not shown).Load latch well 3 moves up closely to contact with the sluice valve 13 of closing, and has formed an enclosed space thus.The vacuum valve V3 of load latch well 3 is opened and it is evacuated.When the inside of load latch well 3 reaches predetermined vacuum tightness, close vacuum valve V3.Subsequently, open the nitrogen valve N3 of load latch well 3 so that to load latch well supplying nitrogen.When the inside of load latch well 3 reaches predetermined pressure, close nitrogen valve N3, the atmosphere of having finished thus in the load latch well 3 is replaced.Then, open sluice valve 13 and support 12 is moved as shown in Figure 2 on the ground, thereby glass material 9 stays in the exocoel 1.
Patrix 6 is upwards slided with respect to cylindrical mould 8, and it separates with counterdie 7 thus.In this state, handle 11 is supporting glass material 9 and by the opening of cylindrical mould 8 glass material is being delivered on the molding surface of counterdie 7.This process is performed such.At first, handle 11 moves down, thereby makes its close glass material 9 that is placed on the support 12 of the retained part that is used for glass material 9.For example clamping after the clamping glass material 9, move on the handle 11 and make its far-end pass the opening of cylindrical mould 8 by rotation by vacuum.When glass material 9 was come the top of counterdie 7, handle 11 and it is moved down stopped.When glass material 9 during, make glass material leave handle 11 and be placed on the counterdie 7 near counterdie 7.
In this process, patrix 6 and counterdie 7 are adjusted to corresponding to the temperature of being scheduled to condition of molding by well heater 10.
When glass material 9 is sent on the molding surface of counterdie 7, the opening of a well heater (not shown) by cylindrical mould 8 inserted in the cylindrical mould 8, so that heating glass material 9.Perhaps, can outside mould, heat glass material 9 in advance and hot glass material is sent in the mould.Before reaching pressing operation, patrix 6 and counterdie 7 and glass material 9 during required preset temperature, the well heater (not shown) is gone back to the outside of removing cylindrical mould 8.Inner chamber 2 moves down so that closely contact the bottom surface of exocoel 1 at once, forms an enclosed space thus.Then, open the vacuum valve V2 of inner chamber 2, so that inner chamber is evacuated.When the atmosphere around the mould reaches predetermined vacuum tightness and upper and lower mould 6 and 7 and reaches predetermined pressed temperature, start the drive unit 14 of patrix 6, so that by extrusion forming glass material 9.When the lower surface of the flange of patrix 6 was resisted against on the upper surface of cylindrical mould 8, the forming operation of glass material 9 finished.
Subsequently, carry out process of cooling.At this moment, the vacuum valve V2 of inner chamber 2 is closed, and the nitrogen valve N2 of inner chamber 2 is opened, so that give the inner chamber supplying nitrogen.When the inside of inner chamber 2 reaches predetermined pressure, close nitrogen valve N2.Open the leak valve R2 of inner chamber 2, so as with the inside of inner chamber 2 set up with exocoel 1 in identical pressure.Subsequently, stop-and-waste valve R2.Perhaps, after closing the vacuum valve V2 of inner chamber 2, at once open leak valve R2 so that from exocoel 1, introduce nitrogen, thereby with the internal regulation of inner chamber 2 to the nitrogen pressure identical with exocoel 1.
Make inner chamber 2 shift to position and unlatching, thereby discharge the heat of savings in inner chamber, to improve cooling efficiency.Nitrogen or similar gas are injected on the mould to promote cooling by nitrogen input tube (not shown).When mould is cooled to ideal temperature, moulded product 29 is exerted pressure from following by counterdie 7, thereby the surface shape of moulded product 29 will can be out of shape.In this state, continue cooling.When mould reaches preset temperature, remove by counterdie 7 applied pressures.
Subsequently, proceed cooling.When mould reaches preset temperature, make on the patrix 6 and move, and by the opening ground of handle 11 moulded product on the counterdie 7 29 is fetched on the support 12 through cylindrical mould 8 according to the opposite program of the operation when injecting glass material in the mould.Support 12 has two positions, i.e. a position and a position that is used to place moulded product 29 that is used to place glass material 9.Send into glass material 9 in the mould and carry out when molded when handle 11, support 12 receives a new glass material 9 and returns the exocoel 1 outside exocoel 1.Therefore, handle 11 is pulled out moulded product 29 and new glass material 9 is sent in the mould.Then, restart moulding process.
In this state, with the moulded product 29 on the outdoor handle (not shown) extraction support 12.New glass material 9 is placed on the support 12 and sends into exocoel 1 by load latch well 3 once more, handle is in waits the state that next moulding begins.Repeat pressure forming in the manner described above.
To be that example is described condition of molding particularly below with the camera lens in the photographic camera.In this case, with diameter is 10 millimeters, thick 3.5 millimeters plate-like crown board heavy sheet glass (specific refractory power: 1.58, Abbe number: 59.4, transition point: 506 ℃) as glass material 9, so that diameter of moulding is 12 millimeters and center thickness is 2.5 millimeters biconvex lens, thereby to have a radius-of-curvature be 40 millimeters a following convex surface and an epirelief spherical (radius-of-curvature is about 29 millimeters) for it.
At first, glass material 9 is injected on the molding surface of counterdie 7.When the temperature of patrix 6 and counterdie 7 reaches 570 ℃ (corresponding to 10
9.5The pool) and the temperature of glass material 9 also reach 570 ℃ (corresponding to 10
9.5Pool) time, close inner chamber 2, and vacuumize, thereby the vacuum tightness in the inner chamber 2 becomes 2.7 handkerchiefs or littler.Proceed heating.When the temperature of patrix 6 and counterdie 7 reaches 580 ℃ (corresponding to 10
9.0Pool) time, reaches 40 seconds with the drive unit 14 of 2900 newton's power actuating patrix 6.Then, finish the forward operation of patrix 6.Even also be held against after this, the pressure of the patrix 6 on the cylindrical mould 8.Then, begin to cool down and at once nitrogen is introduced inner chamber 2, so that the pressure in the inner chamber 2 is adjusted to the pressure that equals the pressure in the exocoel 1.Subsequently, make on the inner chamber 2 and move and open.
When temperature reaches 560 ℃ (corresponding to 10
9.8Pool) time, applies 2000 newton's power and proceed cooling with 7 pairs of moulded products 29 of counterdie.When temperature reaches 490 ℃ (corresponding to 10
13.5Pool) time, the pressure on the counterdie 7 is disengaged.Proceed cooling, up to reaching 470 ℃ (corresponding to 10
15.2Pool).Then, make and move and open mould on the patrix 6, deviate from moulded product 29.
Come molded lens by above-mentioned sequence of operations.Even when using the plate-like lens material, do not stay any air and can obtain the high moulded product of surface accuracy.
With inner chamber 2 required time that is evacuated is 20 seconds or still less, and once reinforced required shaping cycle also can be adjusted to 5 minutes or less time.Because exocoel 1 has big volume, so it needed 5 minutes or more times is evacuated.
(second embodiment)
Fig. 3 is the longitudinal sectional view according to the pressure forming machine of the optical element of second embodiment of the invention.This molding device equipment with first embodiment basically is identical, and the difference of the equipment of it and first embodiment is following aspect.At first, this molding device does not have the load latch well.A support 42 is fixed in the exocoel 31.On support 42 sides, import and export on the side of exocoel 31, have been formed, so that be exocoel 31 loading and unloading glass materials.Exocoel 31 is opened by a sluice valve 43 and ambient atmosphere are isolated.
The well heater 10 in being implemented in cylindrical mould 8, also on the medial surface of inner chamber 32, form a well heater 40 that is used for heating mould and glass.On the outer side of inner chamber 32, form a water jacket or jet-propelled cooling body 22.Inner chamber 32 can with first embodiment in identical mode vertical shifting.In addition, second embodiment is identical with first embodiment, has therefore omitted the specific descriptions to it.
Process with the equipment molded lens with said structure below will be described.At first, as shown in Figure 3, be closed in the sluice valve 43 of the import and export of exocoel 31, make inner chamber 32 shift to the position and open inner chamber.Also open the nitrogen valve N0 in nitrogen supply (NS) source and the vacuum valve V0 in vacuum exhaust source.
In this state, the vacuum valve V1 of exocoel 31 is opened, so that exocoel is evacuated.When the inside of exocoel 31 reaches predetermined vacuum tightness, close vacuum valve V1.Subsequently, open the nitrogen valve N1 of exocoel 31, so that be its supply of nitrogen.When the inside of exocoel 1 reaches predetermined pressure, close nitrogen valve N1, so the atmosphere of having finished in the exocoel 1 is replaced.
Subsequently, the atmosphere of carrying out again in the exocoel 31 is replaced.After atmosphere in exocoel 31 is returned to nitrogen atmosphere, moves up and open inner chamber 32.Glass material on support 42 by with first embodiment in identical mode delivered on the molding surface of counterdie 37 by handle 11.In this operation, by well heater 10 patrix 36 and counterdie 37 are adjusted to the temperature that equals predetermined condition of molding as described above.
Make inner chamber 32 move down and close once more, and well heater 10,40 heating patrix 36 and counterdie 37 and glass materials.Before reaching pressing operation, patrix 36 and counterdie 37 and glass material during required preset temperature, open the vacuum valve V2 of inner chamber 2 at once, so that inner chamber is evacuated.Subsequently, when the atmosphere around the mould reaches predetermined vacuum level and patrix 36 and counterdie 37 and reaches predetermined pressed temperature, activate the drive unit 14 of patrix 36 so that come the formed glass material by pressurization.
After this, carry out process of cooling.At this moment, close the vacuum valve V2 of inner chamber 32 and open the nitrogen valve N2 of inner chamber 32 so that supplying nitrogen.When the inside of inner chamber 32 reaches predetermined pressure, close nitrogen valve N2.In a second embodiment, when inner chamber 32 is positioned at than upper/lower positions and is in closing condition, proceed cooling.In this state, nitrogen or similar gas are directed onto on the mould to promote cooling by nitrogen input tube (not shown).Well heater 40 in the inner chamber 32 is closed, and it is own also to cool off inner chamber 32 by cooling body 22.Therefore, although inner chamber 32 keeps closing condition, also promoted cooling.
When mould is cooled to ideal temperature, exert pressure with 37 pairs of moulded products 39 of counterdie, the surface shape of moulded product 39 will can be out of shape thus.When mould reaches preset temperature, remove by 37 applied pressures of counterdie.
Subsequently, proceed cooling.When mould reaches preset temperature, open the leak valve R2 of inner chamber 32, so that the internal regulation of inner chamber 32 one-tenth is had the nitrogen pressure identical with exocoel 31.Stop-and-waste valve R2 also makes inner chamber 32 move to the position to open then.In addition, patrix 36 is moved up, and the moulded product 39 that utilizes the opening ground of handle 11 by cylindrical mould 8 will be positioned on the counterdie 37 pull to support 42.
Below will according to first embodiment in identical mode be that example describes condition of molding in detail with the used camera lens of photographic camera.
Its shape is similar to the finished product, by phosphate glass (specific refractory power: 1.56, Abbe number: 60.8, transition point: 345 ℃) make and blanks with two surfaces that are polished with the radius-of-curvature identical with net shape as glass material, so that mold a diffraction optical element with lenticular shapes, the diameter of this element is 34 millimeters, center thickness is 5.4 millimeters, therefore it to have radius-of-curvature be the last convex surface that 62 millimeters following convex surface and radius-of-curvature are 96 millimeters, as a result it to have by dark 10 microns and spacing in a large number be the microtexture that 100 microns-1 millimeter concentric circular grooves constitutes.
At first, glass material is injected on the molding surface of counterdie 37.Close inner chamber 32 and heat.When the temperature of patrix 36 and counterdie 37 reaches 390 ℃ (corresponding to 10 of glass viscosity
9.0The pool) and the temperature of glass material also reach 390 ℃ (corresponding to 10 of glass viscosity
9.0Pool) time, the operation that beginning so vacuumizes, so that the vacuum tightness in the inner chamber 32 becomes 2.7 handkerchiefs or littler.Proceed heating.When the temperature of patrix 36 and counterdie 37 reaches 395 ℃ (corresponding to 10 of glass viscosity
8.7Pool) time, activates drive unit 14 work 60 seconds of patrix 36 with 5900 newton's power.Then, finish the forward operation of patrix 36.Even also be held against after this, the pressure of the patrix 36 on the cylindrical mould 8.
Subsequently, begin to cool down and at once nitrogen is injected inner chamber 32, so that cooling continuously in inner chamber 32.When temperature reaches 380 ℃ (corresponding to 10 of glass viscosity
9.7Pool) time, applies 4900 newton's power and continue cooling by 37 pairs of moulded products 39 of counterdie.When temperature reaches 325 ℃ (corresponding to 10 of glass viscosity
14.5Pool) time, removes the pressure on the counterdie 37.
Proceed cooling, up to reaching 320 ℃ (corresponding to 10 of glass viscosity
15.3And the pressure in the inner chamber 32 is adjusted to the nitrogen pressure that equals in the exocoel 31 pool).Then, inner chamber 32 is moved up and open.Make patrix 36 move and open mould on further, take out moulded product 39 thus.
Utilize above-mentioned sequence of operations to come molded diffraction optical element.The microtexture of band groove by transfer printing accurately get off, and do not stay any gas, can obtain the moulded product of surface transfer excellent property thus.With inner chamber 32 required time that is evacuated is 20 seconds or still less, and once reinforced required shaping cycle also was adjusted to 8 minutes or time still less.Because exocoel 31 has big volume, so it needed 5 minutes or more times is evacuated.
Because second embodiment does not have the load latch well, so can only be exocoel loading and unloading glass material when closing inner chamber.In addition, because replacing when each the conveying, the atmosphere of exocoel carries out, so the consumption of nitrogen has increased.In addition, simplified integral device.Can select any equipment (first embodiment or second embodiment) according to the shaped form of total system.
Because described equipment has a well heater and cooling body respectively inside and outside inner chamber, so not quite amplitude reduces cooling efficiency ground raising heating efficiency.Owing to the influence that makes inner chamber do not cooled off and heat, so, mould atmosphere on every side is hedged off from the outer world out although cooling efficiency is lower slightly than the situation when keeping inner chamber to open wide.Therefore, the temperature distribution of mould and glass diminishes, and can obtain more accurate moulded product.Also can according to the required tolerance range of glass moldings with become the original this method of selecting.
(other embodiment)
By the example that exemplifies moulding ordinary lens and diffraction optical element the foregoing description has been described.But the present invention is not limited thereto, and the present invention can be used to various products, for example has the lens or the rectangular lens of free form surface, and for these lens, the shape of glass material is difficult to adjust and therefore may stay gas.In the above-described embodiments, described from the example of a product of a blank moulding.But the present invention also can be used to make with a blank perhaps multi-blank moulding the situation of many products certainly.
In the first embodiment of the present invention, mould is by the heater heats in cylindrical mould.How to heat or cooling die should not be subjected to special restriction.As in a second embodiment, can adopt the well heater or the cooling body that are arranged in the inner chamber.The moment that opens and closes as for inner chamber, just passable as long as inner chamber is closed and is pumped into vacuum at least in pressing operation.From be heated to the refrigerative process, can make inner chamber keep closing condition.The technical combinations mode that can determine these alternativeses earlier according to the precision and cost (shaping cycle, the equipment cost) future events of desired product.
Similarly, in the second embodiment of the present invention, well heater can be arranged in the cylindrical mould so that heating mould.In declaratives to second embodiment, reinforced each time, all be glass blanks of exocoel loading and unloading.Perhaps, can the expanded stent size, load and unload its number and equal the glass blank of feeding quantity several times thereby may be calculated once for exocoel.Therefore, although how many motions of handle has become some complexity, need not to carry out the atmosphere replacement of exocoel inside at every turn, thereby can reduce the consumption of nitrogen.
As mentioned above, according to the foregoing description, before pressing operation, adjust vacuum atmosphere and begin subsequently in the pressure forming machine and forming method thereof of pressing operation at least once, in first closed cavities, be provided with minimum required volumetrical second closed cavities that has around mould.Therefore, can obtain many effects.For example, can greatly shorten before pressing operation, vacuumizing the required time, and can reduce the usage quantity of the rare gas element that will add subsequently.
Because handle is arranged on outside second closed cavities and in first closed cavities, so that be the mould handling glass material, so can load and unload glass under inert gas atmosphere.Therefore, be heated under the pyritous situation at mould, can not oxidation mould ground loading and unloading glass.As a result, can greatly shorten shaping cycle.
Since be provided with the load latch well, thus can between first closed cavities and the external world thereof, transport glass material, and no matter second closed cavities is opened, and still closes.Therefore, can freely set the moment that second closed cavities is opened or closed according to condition of molding.In addition, the volume of load latch well is compared much smaller with first closed cavities.Therefore, can reduce the consumption of rare gas element required when between first closed cavities and the external world thereof, carrying glass material significantly.
When in the heating and cooling process, being in the aforesaid device that is under the inert gas atmosphere and in pressing operation under the vacuum atmosphere and carrying out forming operation, can obtain the moulded product that have good transfer printing performance and not cause the residual gas problem with short shaping cycle, and no matter product has any shape, and what shape also need not manage glass material has.
The present invention is not limited to the foregoing description, can dream up variations and modifications within the spirit and scope of the present invention.Therefore, following claims have been worked out in order to inform public's protection scope of the present invention.
Claims (3)
1. one kind is used for it is characterized in that by using a pair of upper and lower mould to come the hot soft glass material of pressure forming, cool off this glass material and taking out the pressure forming machine of the optical element of glass moldings from described mould it comprises with lower member:
First closed cavities of a replaceable atmosphere wherein;
Second closed cavities that is contained in described first closed cavities and can be independent of described first closed cavities ground replacement atmosphere wherein;
It is the second closed cavities setting and shaped device that be used for coming the hot glass material of moulding by pressurization; And
Be used for the glass material that is contained in described first closed cavities is sent to the described shaped device in described second closed cavities and will be sent into the glass conveyer device of described first closed cavities by the molded and shaped glass moldings of described shaped device.
2. equipment as claimed in claim 1 is characterized in that, one of formation can be independent of the glass load latch well that atmosphere is wherein replaced on the described first closed cavities ground near described first closed cavities, and described load latch well can be opened and sealing airtightly.
One kind by adopt a pair of on, bed die comes the hot soft glass material of pressure forming, cool off this glass material and from described mould, take out the pressure forming method of the optical element of glass moldings, it is characterized in that, this method has adopted a kind of like this molding device, it is first closed cavities that described molding device comprises a replaceable atmosphere wherein, one is contained in described first closed cavities and can be independent of the described first closed cavities ground and replaces second closed cavities of atmosphere wherein and be used to replace described first closed cavities and the device of the atmosphere that second closed cavities is interior, said method comprising the steps of:
Glass material is packed in described first closed cavities;
Before or after loading glass material, replace the internal atmosphere of described first closed cavities with inert condition;
After above-mentioned replacement step, under inert condition, glass material is introduced in the described shaped device in described second closed cavities;
After glass material being introduced described second closed cavities, at the described glass material of the second closed cavities internal heating;
The inside of described second closed cavities is evacuated;
By described molding device compression molding glass material;
Behind the compression molding glass material, rare gas element is introduced in described second closed cavities; And
At the described second closed cavities internal cooling moulded product; And
After cooling step, take out moulded product by described first closed cavities.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31861199A JP3717102B2 (en) | 1999-11-09 | 1999-11-09 | Optical element press molding apparatus and molding method thereof |
| JP318611/1999 | 1999-11-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1295038A CN1295038A (en) | 2001-05-16 |
| CN1237017C true CN1237017C (en) | 2006-01-18 |
Family
ID=18101079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00133892 Expired - Fee Related CN1237017C (en) | 1999-11-09 | 2000-11-09 | Pressure forming equipment and method for optical element |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP3717102B2 (en) |
| CN (1) | CN1237017C (en) |
| MY (1) | MY139926A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106430915A (en) * | 2015-08-10 | 2017-02-22 | Hoya株式会社 | Optical element forming device and optical element forming method |
| CN104445878B (en) * | 2013-09-17 | 2017-04-12 | 东芝机械株式会社 | device for forming glass product |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4686929B2 (en) * | 2001-08-03 | 2011-05-25 | コニカミノルタホールディングス株式会社 | Press forming equipment |
| JP4718230B2 (en) * | 2005-04-15 | 2011-07-06 | 東芝機械株式会社 | Molding equipment |
| JP5690475B2 (en) * | 2009-03-25 | 2015-03-25 | 東芝機械株式会社 | Molding apparatus and method for manufacturing molded product |
| JP6991783B2 (en) * | 2017-08-23 | 2022-01-13 | キヤノン株式会社 | Article transport method, article transport device, optical element manufacturing method, optical element manufacturing device, program, recording medium |
| CN107902877A (en) * | 2017-12-12 | 2018-04-13 | 博硕皓泽自动化设备无锡有限公司 | A kind of 3D bend glass hot-bending machines using vacuum displacement technology |
-
1999
- 1999-11-09 JP JP31861199A patent/JP3717102B2/en not_active Expired - Fee Related
-
2000
- 2000-11-07 MY MYPI20005210 patent/MY139926A/en unknown
- 2000-11-09 CN CN 00133892 patent/CN1237017C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104445878B (en) * | 2013-09-17 | 2017-04-12 | 东芝机械株式会社 | device for forming glass product |
| CN106430915A (en) * | 2015-08-10 | 2017-02-22 | Hoya株式会社 | Optical element forming device and optical element forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001139334A (en) | 2001-05-22 |
| MY139926A (en) | 2009-11-30 |
| CN1295038A (en) | 2001-05-16 |
| JP3717102B2 (en) | 2005-11-16 |
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Granted publication date: 20060118 Termination date: 20161109 |