CN1880249B - Precision mould-pressing forming prefoamer production method and optical component production method - Google Patents
Precision mould-pressing forming prefoamer production method and optical component production method Download PDFInfo
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- CN1880249B CN1880249B CN 200610088600 CN200610088600A CN1880249B CN 1880249 B CN1880249 B CN 1880249B CN 200610088600 CN200610088600 CN 200610088600 CN 200610088600 A CN200610088600 A CN 200610088600A CN 1880249 B CN1880249 B CN 1880249B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B7/00—Distributors for the molten glass; Means for taking-off charges of molten glass; Producing the gob, e.g. controlling the gob shape, weight or delivery tact
- C03B7/10—Cutting-off or severing the glass flow with the aid of knives or scissors or non-contacting cutting means, e.g. a gas jet; Construction of the blades used
- C03B7/12—Cutting-off or severing a free-hanging glass stream, e.g. by the combination of gravity and surface tension forces
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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
- C03B11/02—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing in machines with rotary tables
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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
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B40/00—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it
- C03B40/04—Preventing adhesion between glass and glass or between glass and the means used to shape it, hold it or support it using gas
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2215/00—Press-moulding glass
- C03B2215/63—Pressing between porous dies supplied with gas, i.e. contactless pressing
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
Abstract
The present invention provides a method of making preparative bubble substance, by which we can prevent hot conglutination between glass and molding surface and adhesion of the glass volatile in the hot molding using circle molding mold, so we can keep producing stably. The present invention also provides a method to make optical component using preparative bubble substance produced by following the method above. In the method of making preparative bubble substance, the melting glass from muzzle should be molded into the mold and the gas from molding surface can let the melting glass floating on the molding surface. At the same time, preparative bubble substance should be formed and then we can take out the preparative bubble substance, after which we mold new melting glass into the mold and repeat above working procedure by moving several molds circularly, after taking out the preparative bubble substance and before molding new melting glass, at least one part of molding surface should be forced to refrigerate.
Description
Technical field
The pre-frothing body that the present invention relates to the manufacture method of precision mould-pressing forming prefoamer and aforesaid method is made carries out the method that precise compression molding is made optical element.
Background technology
As the technology with the glass optical element of high precision such as high productivity mass production non-spherical lens, known have a precise compression molding method (optical element moulding method).In the precise compression molding method, the method for employing is that the formed body that making is commonly called the pre-frothing body heats this pre-frothing body then and carries out compression molding.
As the method for making this pre-frothing body, known have: be shaped to glass block by melten glass, this glass block is cut into specified dimension, and carry out grinding, grinding so that smooth surface forms the method (being called cold process) of predetermined weight simultaneously; Isolate the fused glass block of the amount of single pre-frothing body by melten glass, in the process of this glass block of cooling, be directly formed to the method (being called hot-forming method) (with reference to patent documentation 1) of pre-frothing body.
In hot-forming method, during pyritous glass contact forming mould, can locally sharply cool off at contact part glass because of thermal conduction, be easy to generate the be full of cracks that is called as cold crack.Therefore, adopted and on forming mould, formed air cushion, under the state that melten glass floats, carried out the method (being called the floating method of forming) of moulding.Because therefore local contraction when mould partly contacts with melten glass can produce concavo-convex or fold at glass surface.In addition, if mould and melten glass heat bonding, then could the bonding trace of adhesion heat and the dirt settling of moulding stock at glass surface.Therefore, on the problem that solves surface quality, the floating method of forming is extremely excellent method.
Therefore hot-forming method compares the advantage with productivity excellence owing to can directly be made the high ganoid pre-frothing body of weight precision and do not needed mechanical workout by melten glass with cold process.Yet, do not have the pre-frothing of defective body fully owing to must be directly formed to, so technical difficulty to be higher than cold process far away by melten glass.
[patent documentation 1] spy opens the 2003-40632 communique
Summary of the invention
In the floating method of forming of above-mentioned heat, it is generally acknowledged that the pyritous fused glass block keeps levitated state often on forming mould.But, know that by the inventor's research when the front end of molten glass flow dropped on the forming mould, most cases was that glass can contact with mould moment.The reason of glass contact is considered to, and the potential energy that exists and the front end area of molten glass flow are little and can not get sufficient buoyancy.Wherein, even in most cases melten glass contacted with mould moment, can not produce heat bonding yet, but directly be transformed into levitated state.But; situation at the big glass of the heat bonding tendency of moulding and moulding stock; or to improve the turnout of moulding pre-frothing body and when increasing the flow of glass with the forming mould of limited number; the temperature of forming mould can rise, even therefore also usually can produce heat bonding for above-mentioned moment contact.If slight heat bonding is then eliminated back heat bonding trace meeting Lock-out at heat bonding, do not constitute problem, when still producing the heat bonding of severe, can the bonding trace of residual heat.Around hot sticky lapping defect, can produce brush line like this, perhaps heat bonding part sometimes glass ingredient can be reduced and painted.In addition, in the situation of the low viscous molten glass of casting, supporting gas is invaded in the melten glass from heat bonding portion, and the glass after the casting can bubble.
The degree that is easy to produce heat bonding depends on that glass forms, flows out the surfacing of the temperature of temperature, take-off rate, forming mould, forming mould, supporting gas flow etc.For example the phosphate glass of molten state and moulding stock is reactive strong, is very easy to heat bonding.In addition, in general the glass of high refractive index is because the liquidus temperature height, thus flow out the temperature height, and because therefore its proportion height is very easy to heat bonding.In order to prevent heat bonding, the method for temperature that reduces forming mould is effectively, but can produce the problem in the moulding as described below.
Flow out the high glass of temperature owing to the softening temperature height, therefore the peripheral part of fused glass block will solidify in casting.When peripheral part takes place to solidify, because glass can not expanded, therefore can not form big glass block, perhaps the external diameter of pre-frothing body can be out of shape.In addition, when die temperature is hanged down, can produce contraction, glass shape can be different with the shape of mould, thereby mould and glass contact make cold air enter sometimes, and can not keep good levitated state.In order to solve the problem in these moulding, particularly when the relatively large pre-frothing body of moulding, forming mould must carry out heating to a certain degree.Yet if the big glass of heat bonding tendency improves die temperature, heat bonding can take place as mentioned above.As the method that prevents heat bonding, can make forming mould with material difficult and that glass heat is bonding, but die cost can increase, so be not preferred.In addition, if increase the flow of supporting gas, can become also that it is molten sticking to be difficult to, but for low-viscosity glass, melten glass can warpage and produce brush line, and air cushion gets muddled, on the contrary also heat bonding easily sometimes.
Consider that from above-mentioned reason because the kind of glass, the capacity of moulding etc., most cases makes the moulding significant difficulties that becomes.
On the other hand, glass ingredient can volatilize from the pyritous melten glass, although there is difference in degree, volatile component tends to be deposited in the forming mould surface.The glass that particularly volatilizees manyly, the amount of volatile matter that is deposited in the forming mould concave surface is big, is attached on the melten glass again sometimes.Volatile matter heat bonding such situation on molten glass surface owing to utilize washing not remove, therefore can not be used as precision mould-pressing forming prefoamer.
The object of the present invention is to provide in the thermoforming of using at the circulation forming mould, can prevent the glass and the heat bonding of mould molding face and adhering to of glass volatile matter, and pre-frothing system making method that can stably manufactured; And utilize aforesaid method to make the pre-frothing body, by this pre-frothing body is carried out precise compression molding, make the method for optical element with high productivity.
The means that realize above-mentioned purpose are as described below.
[1] manufacture method of precision mould-pressing forming prefoamer, it is characterized in that, to export effusive melten glass from nozzle flow is cast to the forming mould, by gas (hereinafter referred to as supporting gas) from described forming mould molding surface ejection, make described melten glass floating pre-frothing body that is shaped to simultaneously on the forming mould molding surface, from forming mould, take out the pre-frothing body of moulding, the new melten glass of casting in the forming mould that has taken out described pre-frothing body, circulation is transferred a plurality of forming moulds and is carried out above operation repeatedly; During after taking out described pre-frothing body, before the new melten glass of casting, at least a portion of forming mould molding surface is forced cooling.
[2] manufacture method of above-mentioned [1] described precision mould-pressing forming prefoamer, wherein, described melten glass to the forming mould casting is to support the front end that exports effusive melten glass from described nozzle flow by supporter, then support by reducing described supporter or removing described supporter, and from the isolating fused glass block of described melten glass front end.
[3] manufacture method of above-mentioned [2] described precision mould-pressing forming prefoamer, wherein, described supporter is the forming mould that described melten glass casting forms.
[4] manufacture method of above-mentioned [1] described precision mould-pressing forming prefoamer, wherein, described melten glass to forming mould casting is to drip from exported the melten glass that effusive melten glass front end drips by described nozzle flow.
[5] manufacture method of any described precision mould-pressing forming prefoamer in above-mentioned [1]～[4], wherein, described pressure cooling is undertaken by at least a portion feeding liquid to described forming mould molding surface, and casting in after the forming mould molding surface is removed described liquid of described melten glass carried out.
[6] manufacture method of above-mentioned [5] described precision mould-pressing forming prefoamer, wherein, the supply of described liquid is by carrying out to described forming mould molding surface atomizing of liquids.
[7] manufacture method of above-mentioned [5] or [6] described precision mould-pressing forming prefoamer, wherein, after supplying with described liquid, before the new melten glass of casting during, from described forming mould molding surface ejection supporting gas.
[8] manufacture method of any described precision mould-pressing forming prefoamer in above-mentioned [1]～[4], wherein, described pressure cooling is undertaken by at least a portion jet flow stream to described forming mould molding surface.
[9] manufacture method of any described precision mould-pressing forming prefoamer in above-mentioned [1]～[4], wherein, described pressure cooling is undertaken by at least a portion that makes the temperature heat conductor lower than the temperature of described forming mould molding surface contact described forming mould molding surface.
[10] manufacture method of any described precision mould-pressing forming prefoamer in above-mentioned [1]～[9], wherein, the length at least after taking out described pre-frothing body, before the new melten glass of casting heats described forming mould.
[11] manufacture method of optical element, it is a heating glass pre-frothing body, and carries out the manufacture method of the optical element of precise compression molding, it is characterized in that, the pre-frothing body that heating is made by any described method in above-mentioned [1]～[10], and carry out precise compression molding.
[12] manufacture method of above-mentioned [11] described optical element is characterized in that, imports the pre-frothing body in the compression molding mould, heats described mould and pre-frothing body together, and carries out precise compression molding.
[13] manufacture method of above-mentioned [11] described optical element is characterized in that, imports the pre-frothing body that heated in the compression molding mould, and carries out precise compression molding.
According to the manufacture method of precision mould-pressing forming prefoamer of the present invention,, therefore can when flowing out melten glass continuously, stably make the pre-frothing body owing to can positively prevent the heat bonding of glass and forming mould.
In addition, according to the manufacture method of optical element of the present invention, owing to can use the pre-frothing body of high productivity and stable supplying, therefore can high productivity and mass-producing optical elements stably.
Description of drawings
Fig. 1 is the synoptic diagram of the rotary table that uses in an embodiment.
Fig. 2 is the synoptic diagram of the supporter of use in embodiment 5.
Fig. 3 is the synoptic diagram of the pressure assembly of use in embodiment 6.
Embodiment
Below illustrate in greater detail the present invention.
[manufacture method of precision mould-pressing forming prefoamer]
The manufacture method of precision mould-pressing forming prefoamer of the present invention, it is characterized in that, to export effusive melten glass from nozzle flow is cast to the forming mould, by gas (supporting gas) from described forming mould molding surface ejection, make described melten glass floating pre-frothing body that is shaped to simultaneously on the forming mould molding surface, from forming mould, take out the pre-frothing body of moulding, the new melten glass of casting in the forming mould that has taken out described pre-frothing body, circulation is transferred a plurality of forming moulds and is carried out above operation repeatedly; Wherein, after taking out described pre-frothing body, before the new melten glass of casting during, at least a portion of forming mould molding surface is forced cooling.
In order to implement aforesaid method, at first prepare to be founded, the melten glass of homogenizing.Melten glass is heated, accumulates in the container of for example platinum alloy system, is directed to the nozzle flow outlet by the pipe (for example platinum or platinum alloy system) that is connected on this container.By managing and nozzle is heated to specified temperature, can make to export effusive melten glass amount (being called derived quantity) from nozzle flow in the unit time and keep constant.Export the melten glass that separates predetermined weight the effusive melten glass from nozzle flow.Separation method about melten glass is described in the back.
Then, will be in the effusive melten glass of nozzle spout isolated fused glass block or melten glass drip and be cast in the forming mould, on forming mould, be shaped to the pre-frothing body.In the moulding, spray gas (supporting gas) and glass is applied blast upwards by molding surface, thereby make melten glass buoyant on the forming mould molding surface carry out moulding (being called floating moulding) simultaneously from forming mould.Take out the pre-frothing body of moulding from forming mould.The new melten glass of forming mould casting to having taken out the pre-frothing body repeats above-mentioned operation.In the present invention, a plurality of forming moulds of circulation handover carry out above operation repeatedly.
As above-mentioned forming mould, can use the forming mould that has recess and in above-mentioned recess, be provided with a plurality of gas vents.Specifically, can be illustrated in recess and form a large amount of pores with from the mould of each hole ejection supporting gas, form recess and by the mould of porous material from whole recess ejection supporting gas with porous material.
One of according to the embodiment of the present invention, on being the circumference at center, the turning axle with worktable equally spaced disposing a plurality of forming moulds on the rotary table, by the above-mentioned worktable of rotation that indexes in one direction, forming mould is transplanted on successively the position (being called casting position) of watering cast glass.After casting finished, the index rotary table shifted out the forming mould that is loaded with glass from casting position, and the forming mould of the sky before will casting simultaneously is transferred to casting position.By carrying out such operation repeatedly, when being cooled, the forming mould upper glass that moves is formed as the pre-frothing body, near glass temperature is reduced to second-order transition temperature or when being lower than second-order transition temperature, from forming mould, take out pre-frothing body (being called taking-up).The pre-frothing body that is removed can be supplied in subsequent handling after slowly cooling off.On the other hand, take out the back empty forming mould of change and be transplanted on casting position once more.As mentioned above, by making rotary table index rotation in one direction, a plurality of forming moulds that are configured on the rotary table are transferred along circular orbit.
Force cooling
Among the present invention, after taking out above-mentioned pre-frothing body, before the new melten glass of casting during, at least a portion of forming mould molding surface is forced cooling.As mentioned above, glass and forming mould always do not remain on contactless state in floating moulding.Particularly in casting when just having begun, glass flows falls into forming mould, and the front end of glass flows contacts heat bonding also with mould molding face central authorities situation is very many.In addition, casting finishes the aftershaping mould and indexes when rotating, because the mass force of rotation, mould might contact with glass.That is to say that when the casting beginning, the temperature of glass is the highest, glass contacts mould easily owing to the potential energy that falls, and therefore nearly all can produce heat bonding.Certainly, the position overwhelming majority of generation heat bonding is the central part of mould molding face.
In the present invention, force cooling by at least a portion, thereby can be adjusted to the molding surface top casting glass that can not produce the temperature of heat bonding with the glass of casting to the molding surface of the forming mould before casting.At this, so-called pressure cooling is meant and for example makes mould molding face (for example molding surface central part) temperature reduce at least 20 ℃ in 20 seconds or 20 seconds, preferably lowers the temperature 30～70 ℃.The above-mentioned refrigerative forming mould surface that is forced to is preferably used as the molding surface of accepting melten glass, and especially preferably the central part to the molding surface of easy heat bonding cools off.
Above-mentioned pressure cooling is to be lowered into the profile temperature not produce the operation of heat bonding when casting, forces the refrigerative degree preferably according to the suitable adjustment such as temperature of moulding stock, die temperature, glass types or melten glass.In the present invention, for example can force to cool off until being about 200～350 ℃ in the temperature of forcing cooling to finish aftershaping face central part.Can monitor the temperature on forming mould surface by for example radiating thermometer or contact thermometer.
Above-mentioned pressure cooling can be undertaken by at least a portion feeding liquid to the forming mould surface.The flowing fluid ratio gas heat capacity is big, can seize vaporization heat from forming mould when liquid evaporates owing to the heat of forming mould, so cooling efficiency is very good.As the liquid that uses, can illustration water, alcohol etc.From the cooling efficiency height, and angle consideration easy, processing ease, preferably make water.Also can be with the liquid cooling of supplying with, controlled temperature is for example below the room temperature.The amount of the liquid of supplying with can be according to the suitable settings such as composition of the glass of the size of the kind of liquid, die temperature, mould, use.
As the supply method of liquid, can use (1) to the method for forming mould molding surface spraying liquid, (2) drip method from liquid to the forming mould molding surface.Method (1) is effective especially to the whole molding surface feeding liquid of forming mould the time.
The position of the feeding liquid on forming mould surface is a molding surface of accepting melten glass, especially preferably to the central part feeding liquid of the molding surface of easy heat bonding.In addition, in order to cool off whole molding surface, most preferably spray with vaporific center to molding surface.But, as mentioned above,,, also can be prevented the heat bonding effect fully even therefore concentrate on molding surface central authorities and spraying liquid or dropping liquid owing to be easy to generate heat bonding at the molding surface central part.
When forcing to cool off by feeding liquid as mentioned above, at glass surface residual liquid spot, preferably making molding surface before casting is drying regime in order not make the reaction of pyritous glass and liquid or liquid vapors.Therefore, when forcing to cool off by feeding liquid, need be again to forming mould casting melten glass behind the liquid of removing supply from the forming mould molding surface.During before the melten glass that removing of liquid can be behind feeding liquid, casting is new by carrying out from forming mould molding surface ejection supporting gas.Also can not spray supporting gas and remove liquid to forming mould jet surface gas in addition, perhaps draw the liquid on forming mould surface by suction unit.And, also can and with in these methods more than 2 kinds or 2 kinds.In addition, when forming mould was sufficiently high temperature, part or all of the liquid of supply evaporated sometimes.At this moment, for evaporate the back on the forming mould surface residual solids composition not, preferably use the high liquid of purity.For example make under the situation of water, preferably use pure water.In addition, contain the forming mould of porous member, can shorten the evaporation of liquid time by using the surface.Here, can judge easily that by visual liquid is removed.
Carry out the supply of liquid as mentioned above and remove and effectively to remove the volatile matter that is attached to the forming mould molding surface from glass.As the volatile matter from glass, representative substances is B
2O
3Perhaps Li
2O, Na
2O, K
2Alkali compositions such as O, these materials all are dissolved in liquid particularly in the water easily, therefore can easily remove from the forming mould molding surface with liquid.Thereby the present invention is suitable for making by containing B
2O
3The pre-frothing body that constitutes as the glass of glass ingredient, by contain pre-frothing body that the glass of basic metal as glass ingredient constitutes, by containing B
2O
3The pre-frothing body that constitutes as the glass of glass ingredient with basic metal, by containing Li
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing B
2O
3And Li
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing Li
2O and Na
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing Li
2O and K
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing Li
2O, Na
2O and K
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing B
2O
3, Li
2O and Na
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing B
2O
3, Li
2O and K
2O is as the pre-frothing body of the glass formation of glass ingredient, by containing B
2O
3, Li
2O, Na
2O and K
2O is as each pre-frothing body such as pre-frothing body of the glass formation of glass ingredient.
In addition, in the present invention, also can be by at least a portion jet flow stream (hereinafter referred to as air-cooled gas) of forming mould molding surface being carried out above-mentioned pressure cooling.As air-cooled gas, so long as safety and gas with cooling power just do not have the restriction of kind.Consider that from the angle of cheapness air-cooled gas preferably uses air, nitrogen, oxygen, carbonic acid gas, and preferably do not contain the gas of oil content and dust.In order to improve cooling power, also can use to be cooled to the following gas of room temperature.
For example, under the situation of the rotary table that using as mentioned above indexes rotates, can use air-cooled gas to force cooling by the following method.At first, above the extracting position and the rotary table between the casting position of pre-frothing body, dispose air-cooled gas nozzle.When the shaping mould tool is shifted into the below of air-cooled gas usefulness nozzle,, force cooling by spraying air-cooled gas to forming mould from this nozzle.Under the situation of forming mould molding surface ejection supporting gas, when the air-cooled gas of spraying,, preferably the pressure of air-cooled gas is set for the pressure higher than the pressure of supporting gas in order to improve cooling efficiency.The injecting time of air-cooled gas can be set at for example about 3～30 seconds according to the suitable settings such as composition of the glass of the temperature of air-cooled gas, die temperature, use.
In addition, in the present invention,, also can carry out above-mentioned pressure cooling by making at least a portion of the temperature heat conductor contact moudling die surface lower than the temperature on forming mould surface.As heat conductor, for example except the high metal of the such thermal conductivity of aluminium, copper, brass, iron, can also use common metal such as stainless steel.In addition, wear and tear in order to prevent to contact with mould, abrasion powder is attached on the pre-frothing body, also can implement abrasion-resistant coatings as required.In addition, in order to relax contact impact, the preferred method that makes the heat conductor contact by spring pressure of using.As abrasion-resistant coatings, can the illustration chromiumcoating, nitride coatings etc.As long as the temperature of above-mentioned heat conductor can be for example 20～80 ℃ lower than the temperature on forming mould surface.In addition, in order to improve cooling efficiency, preferably water cooling plant is set in heat conductor inside.In addition, in order to improve thermal conductivity, also can introduce heat pipe structure.
Above-mentioned heat conductor can be a rhoptry for example, by making at least a portion of its top contact moudling die surface, forces cooling.The size that the sphere attrition process is roughly coincide to the recess with molding surface is preferably carried out on claval top.Thus, can improve cooling efficiency.
For example, as mentioned above, use indexes under the situation of rotary table of rotation, the above-mentioned heat conductor of configuration above the extracting position of pre-frothing body and the rotary table between the casting position, when the shaping mould tool is shifted into the worktable below, by heat conductor is reduced to contact with forming mould, force cooling.Can for example can be set at about 3～30 seconds duration of contact according to the composition or the suitable settings such as moulding capacity, pouring time of the glass of the kind of heat conductor and temperature, die temperature, use.
More than, illustrated that as forced cooling method the method, (2) of (1) feeding liquid use the method for air-cooled gas, (3) to use the method for heat conductor, also can be used in combination in the present invention certainly in these methods more than 2 kinds or 2 kinds.
The separation of melten glass
Then, describe at export the method that fractional melting glass block the effusive melten glass or melten glass drip from nozzle flow.
The 1st separation method is to export the melten glass that drips from nozzle flow, obtains the method (being called the method for dripping) of the glass drop of desired wt.For the method for dripping, exist from the drip method (be called nature drip method) of melten glass and nozzle flow exported that vertical glass applies blast and the method for dripping of nozzle flow outlet nature.In the method for dripping naturally, act on gravity that nozzle flow exports vertical glass when to desire to make glass by the surface tension of glass and stay nozzle flow and export vertical power bigger, produce drippage.In the method for dripping,, except gravity, also be applied with the power that blast produces as the downward power that puts on glass applying blast, though therefore with identical viscosities from the same nozzle same glass of dripping, this method also can obtain the littler glass drop of weight.
Glass drop can directly be accepted with forming mould, transfers in the forming mould after also can accepting with the parts different with mould.Casting in the 1st separation method is carried out as mentioned above like that, but method of the present invention is suitable for directly accepting with forming mould the situation of glass drop.When directly accepting from glass that the nozzle flow outlet is dripped with forming mould, because glass is in the condition of high temperature, therefore be easy to generate the heat bonding with forming mould, but by before casting, forming mould being forced cooling, thereby heat bonding can positively be prevented.
The 2nd separation method is the method that is suitable for separating than the more heavy weight glass of the method for dripping.In the method, export the leading section of effusive molten glass flow from nozzle flow with support body supports, under the state that does not separate molten glass flow, on supporter, accumulate glass, reduce supporter (being called the decline process of chopping) fast with the regulation timing, perhaps remove the support of supporter, thereby separate the glass that lodges on the supporter, isolate fused glass block from molten glass flow.For example use the supporter that constitutes at the separable amalgamation parts of width, after accepting the molten glass flow front end, pass through to separate amalgamation parts, the support that can remove supporter.By supporting the leading section of molten glass flow, between the leading section of molten glass flow and nozzle side, produce necking down, according to aforesaid operations, do not use cutters, will produce the separation of glass at necking section by the surface tension of glass.Under the state of the support that does not have supporter, separate owing to the weight of dripping naturally produces glass, but, can separate the bigger glass of weight by supporting the molten glass flow front end.Usually, by make above-mentioned timing or when supporting molten glass flow and separate the constant distance of spray nozzle front end and supporter, can separate the glass of constant weight.
Here,, the forming mould that forms by the casting melten glass can be used, also the supporting body special different can be used with forming mould as above-mentioned supporter.According to the present invention,,, also can avoid heat bonding problem with glass even therefore forming mould is used as supporter because forming mould is forced to cooling.In addition, in order to prevent and the heat bonding of melten glass, also can use supporter with water cooling plant.
When casting the more heavy weight glass of glass that obtains than dripping naturally, more heat supplies to forming mould from the glass of casting.The temperature of forming mould excessively rises easily when consequently, recycling.And because weight of glass is big, the potential energy of glass during easily because of casting contacts with forming mould.From above-mentioned reason, the danger of the heat bonding of above-mentioned situation lower-glass and mould increases, but according to the present invention, because the temperature with the forming mould surface before casting beginning is reduced to the temperature that heat bonding does not take place, so can stably produces greater weight pre-frothing body and can not produce heat bonding.
In the 1st, the 2nd separation method of above explanation, as long as make the glass flows output in the time per unit keep constant, and make the timed interval of separation of glasses constant, the glass of weight such as all can separate.And two kinds of methods are all different with the cut mechanically method, are not called as the cutting trace of shearing trace owing to can not produce, so can the level and smooth pre-frothing body of molded surface.
In the present invention, by forcing cooling, the mould molding surface temperature is cooled to the temperature that heat bonding does not take place when the casting beginning.On the other hand, evenly expand to carry out moulding in order not hinder glass, preferred rapid temperature with the forming mould surface is increased to specified temperature in casting beginning back.For this reason, the preferred length at least after taking out the pre-frothing body, before the new melten glass of casting or continue the hot briquetting mould during this period.Because above-mentioned pressure cooling is to carry out at the molding surface of mould, so the die ontology portion temperature beyond the molding surface can be too not low.Like this, forcing cooling to finish back mould molding face owing to heated once more from the thermal conduction of die ontology portion, the temperature of molding surface can rise lentamente.But,, adjust and force refrigerative intensity for the temperature of mould molding face when casting begins does not reach the temperature that produces heat bonding.In addition, owing to the thermal conduction from melten glass, the temperature of molding surface can sharply rise in casting beginning back.Thus, can form the temperature that can not produce heat bonding, in casting, be rapidly heated to the degree of the even expansion that does not hinder glass at the casting initial stage.After the casting, heating mould to the degree that do not crack is carried out air-cooled simultaneously to melten glass from the top, with glass cools to the temperature that can take out.
As mentioned above, owing to the pressure cooling of forming mould is carried out at the molding surface of mould, therefore forcing cooling end aftershaping surface temperature to recover in advance.When beginning casting die temperature drop to the temperature that does not produce heat bonding, but since subsequently die temperature rises naturally, so can not hinder also that glass does not evenly stretch when casting.That is to say that above-mentioned pressure cooling can realize that local temperature reduces and temperature is recovered in advance.Thereby the heating of forming mould can utilize constant power to carry out usually.In the present invention, for example can be with the temperature maintenance of forming mould body at about 200～400 ℃.Can certainly adopt at the temperature method for optimizing that from the process that is poured into taking-up, makes forming mould.But, the temperature of forming mould is changed with the position on rotary table is different, it is complicated that device can become, and cost increases easily.And the high efficiency of forming system for be about for 10～30 seconds from the time that is poured into taking-up is difficult to controlled temperature exactly sometimes.Thereby for such high efficiency of forming, it is effective especially before will casting the forming mould molding surface being forced refrigerative method of the present invention.
On the other hand, open utilization is thermoelectric to monitoring the temperature of forming mould often, according to the method for controlling die temperature from the stage that is poured into taking-up (for example No. the 2798208th, Japanese Patent).
But, because forming mould thermal capacity is big, thus after taking-up to the short period of time that begins to cast, even with the well heater outage, most cases can not reduce die temperature.Particularly the situation of casting is repeatedly expeditiously only used about 10 seconds from being taken out to casting, therefore reduces very difficulty of die temperature.And, even die temperature reduces, but since not only molding surface but also all temperature of mould all can reduce, thereby the rate of heating after the casting can be slack-off.On the contrary, in the present invention since the skin section that can be cooled to profile molding surface central authorities particularly therefore have casting back temperature and recover fast advantage.
In addition, according to the present invention, since the temperature variation that can make forming mould naturally to be suitable for casting, the temperature of floating moulding, taking-up, therefore for example the pre-frothing body number of time per unit moulding can be increased to more than or equal to 20/minute, the forming mould that recycles also can be dealt with 10～18 of few numbers.Because the forming mould costliness is used to exceed necessary number, aspect cost, can have problems, and adjust also bothersome.In addition,, thereby also bring big burden for the transfer device of forming mould, be difficult to rotary table at high speed because all the weight of forming mould also becomes greatly.Can address the above problem according to the present invention.
[manufacture method of optical element]
The manufacture method of optical element of the present invention, it is a heating glass system pre-frothing body, and carry out the method that precise compression molding is made optical element, it is characterized in that, the pre-frothing body that heating is made by the manufacture method of precision mould-pressing forming prefoamer of the present invention, and carry out precise compression molding.
Precise compression molding itself is the known method that is also referred to as the optical element moulding method.The face of the seeing through of optical element, refraction, diffraction, reflection ray is called the optical function face.When for example being example with lens, the aspheric surface of non-spherical lens, the lens faces such as sphere of spherical lens are equivalent to the optical function face.The precise compression molding method is critically to copy on glassly by the molding surface with the compression molding mould, forms the method for optical function face with compression molding.That is to say, do not need to increase to mechanical workouts such as the grinding finishing the optical function face and carry out or grinding.
According to the present invention, can make the various optical elements such as lens, lens stop, prism of various lens such as spherical lens, non-spherical lens, microlens, diffraction grating, band diffraction grating, according to purposes, can make imaging lens system that the mobile telephone of lens, the band photographic camera of the image pickup optical system that constitutes digital camera and built-in film-type photographic camera carries, be used for CD and DVD is the data read of optical storage formula medium of representative and/or the various optical elements such as lens that conducting light that data write purposes is used.
In addition, these optical elements optical thin films such as film that antireflection film, total reflection film, partial reflection film also can be set as required, have dichroism.
As the compression molding mould that is used for the precise compression molding method, known mould can illustration for example the molding surface of formed material such as silicon carbide, superhard material be provided with the mould of mould release film, the compression molding mould of preferred silicon carbide system.As mould release film, can use to contain carbon film, precious metal alloys film etc., from considerations such as weather resistance, cost aspects, preferably contain carbon film.
In the precise compression molding method, for the molding surface with the compression molding mould remains good state, the atmosphere gas during preferred moulding is made as non-oxidizing gas.As non-oxidizing gas, the mixed gas of preferred nitrogen, nitrogen and hydrogen etc.
Molding pressure can suit to adjust, and can be controlled at 50～150kgf/cm
2Scope.In addition, clamp time also can suit to adjust, and can be controlled at the scope in 10～300 seconds.
Then, the precise compression molding method at the manufacture method that is particularly suitable for optical element of the present invention describes.
(precise compression molding method 1)
This method is to import above-mentioned pre-frothing body to the compression molding mould, heats above-mentioned forming mould and pre-frothing body together, and carries out the method for precise compression molding.To call this method in the following text is precise compression molding method 1.
In precise compression molding method 1, preferably, will constitute the glass heats of pre-frothing body to showing 10 according to the temperature of compression molding mould and above-mentioned pre-frothing body
6～10
12The temperature of the viscosity of dPas and carry out precise compression molding.And, preferably extremely show more than or equal to 10 in above-mentioned glass cools
12DPas, more preferably greater than equaling 10
14DPas and then be preferably greater than and equal 10
16From the compression molding mould, take out the precise compression molding product after the temperature of the viscosity of dPas.
By above-mentioned condition, utilize the glass shape of backed stamper molding die molding surface critically, the while can also be taken out the precise compression molding product and do not produced distortion.
(precise compression molding method 2)
This method is behind heating (preheating) above-mentioned pre-frothing body, import it in compression molding mould and carry out precise compression molding, promptly distinguish pre-hot compression molding mould and pre-frothing body, the pre-frothing body after the preheating is imported the method for carrying out precise compression molding in the compression molding mould.To call this method in the following text is precise compression molding method 2.
According to this method owing to before in the compression molding mould, importing above-mentioned pre-frothing body, heating in advance, so can shorten the cycle, and can produce do not have surface imperfection, surface accuracy good optical element.Here, preferably set the preheating temperature of compression molding mould for be lower than the pre-frothing body preheating temperature.Like this, by reducing the preheating temperature of compression molding mould, can reduce the consumption of above-mentioned mould.In addition, owing to need therefore can also not reduce the number of the compression molding mould of use at compression molding mould internal heating pre-frothing body.
In precise compression molding method 2, the glass that preferably constitutes above-mentioned pre-frothing body is preheated to demonstration smaller or equal to 10
9DPas, more preferably 10
9The temperature of the viscosity of dPas.And, carry out preheating in the time of the above-mentioned pre-frothing body of preferred supporting, and then the glass that preferably constitutes above-mentioned pre-frothing body is preheated to and shows 10
5.5～10
9DPas, more preferably greater than equaling 10
5.5DPas is less than 10
9The temperature of the viscosity of dPas.In addition, preferably from the cooling of beginning beginning glass mold pressing the time or the mold pressing way.The temperature of compression molding mould transfers to the temperature lower than the preheating temperature of above-mentioned pre-frothing body, can be controlled at above-mentioned glass display 10
9～10
12The temperature of the viscosity of dPas.In the method, after the compression molding, preferably in the viscosity that is cooled to above-mentioned glass more than or equal to 10
12The demoulding behind the dPas.
Optical element behind the precise compression molding takes out in the compression molding mould, as required slowly cooling.Under the situation of molded lens, the processing of can feeling relieved.And, can also form the optical thin film coating on the surface as required.
According to the present invention, be applied to and high productivity make the precise compression molding method of optical element by the pre-frothing body that high productivity is made, thereby can carry out the production of glass and even the production of optical element effectively.
[embodiment]
Be described more specifically the present invention by the following examples, but the present invention is not limited to these embodiment.
Embodiment 1
With nd:1.8468, vd:23.5 with P
2O
5, R
2O (R:Li, Na, K), Nb
2O
5Put into platinum crucible for the fragment of the glass of principal constituent, after 1000 ℃ of fusings, carry out deaeration at 1100 ℃ and found, stir, obtain melten glass.Make this melten glass by being combined in crucible bottom and having carried out temperature controlled platinotron, with platinum alloy system mass flowing nozzle (the top ends external diameter: Φ 6.0mm, central aperture: 1.1mm) continuously flow out of 1.21 kilograms/hour take-off rate from 900 ℃.
On the other hand, as shown in Figure 1, on the periphery of rotary table, dispose 12 forming moulds equably.On the molding surface of forming mould, embed the parts that porous material are processed into concave surface, 0.3 liter/minute nitrogen is sprayed to the molding surface side.And, at the forming mould body well heater is installed, die ontology portion is heated to 310 ℃.
When formed glass, will be positioned at about the forming mould rising 60mm under the spout, accept the front end of molten glass flow, the melten glass of in mould, casting with this state with forming mould.When on forming mould, accumulating the melten glass of predetermined weight, reduce forming mould fast, thereby cut off molten glass flow, on forming mould, obtain fused glass block.Then, make rotary table index rotation, under spout, withdraw from forming mould, simultaneously the forming mould of adjacent sky is moved under the nozzle, once more to forming mould top casting melten glass.Repeat this operation, with the 430mm that on forming mould, casts one by one at interval for 5.1 seconds
3Melten glass.Supporting gas owing to the molding surface from forming mould sprays cuts off isolated fused glass block and roughly is levitated state, and the top slow cooling of air-cooled melten glass.When carrying out 9 above-mentioned indexes rotation,, but therefore utilize the automatic manipulator suction glass block of vacuum take-off because glass is reduced to the temperature that can take out, it is discarded.The molding surface side central observation of this glass block to because of with the bonding thorn-like projection that produces of mold hot.
Then, in the position pressure cooling die molding surface of the forming mould index of sky being rotated 30 ° from extracting position.Forcing cooling is that 4 seconds, vaporific pure water carried out by spraying to the central part of molding surface with spraying plant.The pure water of spraying is owing to the nitrogen that sprays from molding surface and the heat flash evapn of mould, thereby the molding surface of forming mould becomes drying regime.Force cooling by this, the molding surface temperature reduces by 54 ℃ before will casting.To force cooled forming mould to be transferred under the spout like this, with the above-mentioned method melten glass of casting one by one.Equally, on forming mould cool off on one side and be transferred to extracting position on one side, utilize automatic manipulator suction glass block and be arranged in the purpose-made pallet.The pre-frothing surface that obtains does not have hot sticky lapping defect, and surface quality is good.And even after continuously shaped 10 hours, the surface quality of pre-frothing body does not change yet.
Only forming mould is altered to mould as described below, utilizes method moulding pre-frothing body similarly to Example 1.The recess shape of the molding surface of forming mould is identical with embodiment 1, but recess is made the gas squit hole about the 0.3mm of center configuration satellite shape (spraying poroid) by stainless steel.Nitrogen from 0.04 liter/minute of this hole ejection is heated to 310 ℃ with well heater with die ontology.And, similarly after taking-up the spraying 4 seconds pure water.Force cooling by this, the molding surface temperature reduces by 52 ℃ before will casting.Use the situation of this forming mould, and pure water can flash evapn unlike embodiment 1.Therefore, behind the spraying pure water, go up suction machine, aspirate to remove remaining pure water from forming mould top cover.By this operation, the molding surface of forming mould becomes drying regime.
Repeat this operation, with moulding 430mm one by one at interval in 5.1 seconds
3The pre-frothing body.The pre-frothing body that obtains does not have hot sticky lapping defect, and surface quality is good.And, the pure water jet compression nitrogen that remains on the forming mould is carried out dry situation, the pre-frothing body does not have hot sticky lapping defect yet, and surface quality is good.In addition, even after continuously shaped 10 hours, the surface quality of pre-frothing body does not change yet.
Embodiment 3
Only change the pressure refrigerative method of embodiment 1, similarly moulding 430mm
3The pre-frothing body.At first prepare top sphere attrition process is become the aluminium bar (length: 80mm), form the water route of Φ 6mm in rod inside of the Φ 11mm of 7R.For this water route, there is the inlet of water coolant in the position of distance sphere process side top 15mm, there is the outlet of water coolant in the position of 65mm.And the finished excellent top of sphere forms the close-fitting size of center radius (7R) with the forming mould recess.The rod of above-mentioned subsidiary water cooling plant is installed on the platform of subsidiary cylinder movable up and down, be disposed at the forming mould after 60 ° of the extracting position of Fig. 1 index rotations position (casting position keeps left) directly over (apart from mould 20mm).In addition, in the inside of rod with 20 liters/minute traffic flow water coolant.
In the process of moulding pre-frothing body, forming mould moves to the below of rod, reduces water cooling rod after 0.3 second, makes the top of rod contact for 4 seconds with the recess central authorities of forming mould.By this contact, the molding surface temperature of forming mould reduces by 48 ℃ before will casting.Rod is risen, and mobile forming mould is to casting position, to forming mould top casting melten glass.Repeat this operation, with the 430mm that casts one by one at interval for 5.1 seconds
3Melten glass, and moulding pre-frothing body.The pre-frothing surface that obtains does not have hot sticky lapping defect, and surface quality is good.And the surface quality of pre-frothing body does not change yet after continuously shaped 10 hours.
Embodiment 4
Only change the pressure refrigerative method of embodiment 1, similarly moulding 430mm
3The pre-frothing body.Two places that are in Fig. 1 force on the cool position forming mould directly over (apart from mould upper end 1mm) configuration spray the air-cooled nozzle (internal diameter Φ 0.8mm) that nitrogen is used.The pressure of jet flow stream is than the high pressure (0.3MPa) of pressure (0.1MPa) from the gas of the molding surface of forming mould ejection.
In the process of moulding pre-frothing body, after just forming mould being moved to below the 1st air-cooled nozzle, spray 80 liters/minute nitrogen in 5 seconds.Stop air-cooled after with 30 ° of forming mould index rotations, spray the air-cooled gas in 80 liters/minute of 5 seconds once more with the 2nd air-cooled nozzle, carry out air-cooled to the molding surface of forming mould.Air-cooled by above-mentioned 2 places, the molding surface temperature of forming mould reduces by 44 ℃ before will casting.By making the recess of air-cooled nozzle near forming mould, air-flow can flow to the top of mould, so the temperature of the part beyond the molding surface does not almost change.After carrying out above-mentioned cooling, forming mould is transferred to casting position, with the 430mm that casts one by one at interval for 5.1 seconds
3Melten glass, and moulding pre-frothing body.The pre-frothing surface that obtains does not have hot sticky lapping defect, and surface quality is good.And the surface quality of pre-frothing body does not change yet after continuously shaped 10 hours.
Embodiment 5
At first, use internal diameter than the nozzle of the thick 0.1mm of mass flowing nozzle of embodiment 1 (top ends external diameter: Φ 6.0mm, central aperture: 1.2mm), flow out (except that the nozzle difference, other conditions and embodiment 1 are identical) continuously with the take-off rate of 1.36kg/hr.In addition, as shown in Figure 2, the supporter that the configuration cuts glass flows is used under spout, thereunder configuration forming mould similarly to Example 1.As shown in Figure 2, supporter forms the shape of 2 dull and stereotyped butt joints, forms recess in the part of accepting melten glass.The recess of accepting melten glass is made of porous material, can spray nitrogen equably from recessed whole face.In addition,, the water route is set in flat board, mobile 10 liters/minute water coolant in order to prevent and the melten glass heat bonding.Under the state of 2 supporters butt joint, accept, supporter is reduced 50mm after at the appointed time, thereby on supporter, obtain 430mm from the effusive molten glass flow of nozzle
3Fused glass block.Then, supporter is separated, fused glass block is fallen and inserts in the forming mould.To repeat this operation 4.6 seconds at interval, supply with fused glass block to forming mould one by one from supporter.Here, optimize by the quality of checking the pre-frothing body to the timing of the logical nitrogen of supporter and the timing that supporter is separated.In addition, the cooling of forcing cool position be spray similarly to Example 14 second pure water.The pre-frothing surface that obtains does not have hot sticky lapping defect, and surface quality is good.And the surface quality of pre-frothing body does not change yet after continuously shaped 10 hours.On the other hand, do not force under the refrigerative situation, can produce heat bonding in molding surface in the time of in melten glass being fallen the insertion forming mould, a plurality of hot sticky lapping defects are observed in the pre-frothing surface after moulding.
Comparative example 1
Except not forcing cooling, with method moulding pre-frothing body similarly to Example 2.There is hot sticky lapping defect in the pre-frothing body that obtains, the non-constant of shape and surface quality in central authorities and peripheral part.And, in the time of continuously shaped about 3 hours, begin the dirt of heat bonding volatile matter, even can not remove by washing at the peripheral part of pre-frothing body.
Embodiment 6
The pre-frothing body that obtains in the heating the various embodiments described above uses pressure assembly shown in Figure 3, obtains non-spherical lens by carrying out precise compression molding (aspheric surface precise compression molding).The details of precise compression molding is as described below.After resting on the pre-frothing body between the counterdie 2 of SiC system and the patrix 1, make to be nitrogen atmosphere gas in the silica tube 11, and in the heated quarty tube 11 to well heater 12 energisings with aspherical shape.The forming mould temperature inside is set at the temperature of yield-point+20 ℃ of glass～60 ℃, and keep this temperature, and meanwhile extruding rod 13 extruding patrixes 1 reduced, thus the pre-frothing body in the compression molding mould is carried out precise compression molding.Molding pressure is 8MPa, molding time was 30 seconds, after mold pressing, the non-spherical lens of the fluorphosphate glass system of moulding was contacted under the state of counterdie 2 and patrix 1, slowly cool to the temperature of second-order transition temperature-30 ℃, then be quickly cooled to room temperature.Subsequently, from the compression molding mould, take out non-spherical lens, carry out the mensuration and the visual inspection of shape.The non-spherical lens that obtains is the very high lens of precision.Observe this lens, results verification it be and the same high-quality lens of the pre-frothing body that uses.Here, preferably mould release film is set on the whole surface of pre-frothing body.As mould release film, can the illustration carbon film and self-organization film etc.
For in the compression molding mould, importing the above-mentioned pre-frothing body after the preheating and carrying out the method for precise compression molding, also can obtain high-quality, the high-precision non-spherical lens that constitutes by fluorphosphate glass.
In addition, the shape of the precise compression molding product that can make according to desire of the shape of pre-frothing body, size etc. is suitable definite.
In the above-described embodiments moulding non-spherical lens, by using the compression molding mould consistent with the shape of end article, can also make various non-spherical lenses or various spherical lenses such as recessed meniscus shaped lens, male bend moon-shaped lens, plano-convex lens, two convex lens, plano-concave lens, two concavees lens, perhaps optical elements such as prism, polygon prism, diffraction grating.
In addition, on the optical function face of each optical element that obtains, also can form optical multilayers such as antireflection film or highly reflecting films as required.
The possibility of utilizing on the industry
According to the present invention, can be by high-quality mould-pressing forming prefoamer and the optical element of a large amount of productions in melten glass high production rate ground.
Claims (10)
1. the manufacture method of precision mould-pressing forming prefoamer, it is characterized in that, to export effusive melten glass from nozzle flow is cast to the forming mould, by the gas from described forming mould molding surface ejection is supporting gas, make described melten glass floating pre-frothing body that is shaped to simultaneously on the forming mould molding surface, from forming mould, take out the pre-frothing body of moulding, the new melten glass of casting in the forming mould that has taken out described pre-frothing body, circulation is transferred a plurality of forming moulds and is carried out above operation repeatedly; During after taking out described pre-frothing body, before the new melten glass of casting, at least a portion of forming mould molding surface is forced cooling, described pressure cooling is undertaken by following arbitrary mode: by force cooling at least a portion feeding liquid of described forming mould molding surface, casting in after the forming mould molding surface is removed described liquid of described melten glass carried out; By force cooling at least a portion jet flow stream of described forming mould molding surface; Force cooling by at least a portion that makes the temperature heat conductor lower contact described forming mould molding surface than the temperature of described forming mould molding surface.
2. the manufacture method of precision mould-pressing forming prefoamer according to claim 1, wherein, described melten glass to the forming mould casting is a fused glass block, be to support the front end that exports effusive melten glass from described nozzle flow by supporter, then support by reducing described supporter or removing described supporter, and separate from described melten glass front end.
3. the manufacture method of precision mould-pressing forming prefoamer according to claim 2, wherein, described supporter is the forming mould that described melten glass casting forms.
4. the manufacture method of precision mould-pressing forming prefoamer according to claim 1, wherein, described melten glass to the forming mould casting is to drip from exported the melten glass that effusive melten glass front end drips by described nozzle flow.
5. according to the manufacture method of any described precision mould-pressing forming prefoamer in the claim 1～4, wherein, the supply of described liquid is by carrying out to described forming mould molding surface spraying liquid.
6. the manufacture method of precision mould-pressing forming prefoamer according to claim 5, wherein, after supplying with described liquid, before the new melten glass of casting during, from described forming mould molding surface ejection supporting gas.
7. the manufacture method of precision mould-pressing forming prefoamer according to claim 1, wherein, the length at least after taking out described pre-frothing body, before the new melten glass of casting heats described forming mould.
8. the manufacture method of optical element, it is a heating glass pre-frothing body, and carries out the manufacture method of the optical element of precise compression molding, it is characterized in that, the pre-frothing body that heating is made by any described method in the claim 1～7, and carry out precise compression molding.
9. the manufacture method of optical element according to claim 8 is characterized in that, imports the pre-frothing body in the compression molding mould, heats described mould and pre-frothing body together, and carries out precise compression molding.
10. the manufacture method of optical element according to claim 8 is characterized in that, imports the pre-frothing body that heated in the compression molding mould, and carries out precise compression molding.
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| JP2009179486A (en) * | 2008-01-29 | 2009-08-13 | Hoya Corp | Method for producing hot-molded article, method for producing preform for precision press molding, and method for producing optical element |
| JP4949324B2 (en) * | 2008-05-30 | 2012-06-06 | 株式会社オハラ | Glass molded body manufacturing method and glass molded body manufacturing apparatus |
| CN102173564B (en) * | 2011-03-08 | 2012-10-03 | 湖南大学 | Non-isothermal air float type die forming method |
| KR102004765B1 (en) * | 2013-07-29 | 2019-07-29 | 삼성전기주식회사 | Cutting and load device of lens |
| JP2015078099A (en) * | 2013-10-18 | 2015-04-23 | Hoya株式会社 | Glass outflow device, glass outflow method, method of manufacturing preform for press molding, and method of manufacturing optical element |
| CN109095755A (en) * | 2018-08-16 | 2018-12-28 | 中国建筑材料科学研究总院有限公司 | The processing method of glass preform |
| CN114590991A (en) * | 2022-01-25 | 2022-06-07 | 南京庆科电子技术有限公司 | Fusion sealing process and device for glass sealing connector |
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