CN1262496C - Forming method and forming device for optical glass component - Google Patents

Abstract

To form an optical glass element which is very difficult to form, by positively controlling the temperature distribution inside an optical glass base material to be formed during heating and cooling. The optical glass base material is arranged between a couple of upper and lower molds, and the base material is heated and made into a flowable state while heating the above-mentioned molds. Thereafter, press molding is performed by approximating the molds relatively, and after cooling, the optical glass element is taken out by releasing the optical glass base material from the molds. During heating or cooling or heating and cooling, a temperature distribution is imparted to the molds.

Description

The manufacturing process of optical glass device and building mortion

Technical field

The present invention relates to a kind of manufacturing process and building mortion of optical glass device.

Background technology

Recently, require to enlarge lens combination design freedom, realize that miniaturization or the heavy caliberization that can not accomplish so far and the requirement that improves optical property grow to even greater heights, can realize that the demand of non-spherical lens of this requirement is increasing.Develop multiple following method as the manufacturing process of optical element with this aspheric lens shape, promptly, obtain the optical element of desired shape by under state, carrying out mold pressing, being shaped with configuration opticglass blank between the shaping dies of aspherical shape.

For example, inserting cylindrical circular approximately parts slidably is to clip the optics blank between a pair of cylindrical approximately shaping dies in the sleeve (hereinafter referred to as " sleeve "), under this state, heat from the sleeve peripheral part with lamp well heater (ラ Application プ ヒ one one), make shaping dies relatively near and mold pressing forms.This method lamp well heater even heating shaping dies and opticglass blank.As this even heating method, it is recess in shaping dies indoor design hollow that the spy opens flat 7-277750 communique etc., controls the unfairness state of offsetting forming face by carrying out temperature.This shaping dies or heating unit make the various devices of uniformity of temperature profile be based on that following notion constitutes from structure being used to of taking: promptly optimum regime be glass temperature inside that needs are shaped distribute keep even.

, this method is thick and when being aspheric surface at the opticglass blank, is difficult to carry out the uniform temperature control that distributes, thereby can not be suitable for.So, from before just begin to develop the method for coming controlled temperature according to the thickness of opticglass blank.

One of this method is the method with operation of monomer heating opticglass blank, when carrying out the monomer heating, comes controlled temperature distribute (opening flat 5-24858 communique with reference to the spy) according to the thickness of required optical glass device shape.

Additive method is, in the refrigerating work procedure after shaping, the temperature that makes the temperature of optics center of face be kept above non-optical face is cooled off (opening flat 2-55235 communique with reference to the spy).

But, open as described in the flat 5-24858 communique as the spy, even coming to give temperature distribution to the opticglass blank before the die forming by the monomer heating process forms, in fact the utmost point after the forming face of opticglass blank and shaping dies contacts is in the short period of time, between opticglass blank and shaping dies, produce heat exchange, so there is the problem of the temperature distribution disappearance of being given.This point has been used the temperature distribution that makes progress recently and has calculated the actual temperature distributed computation result that simulation technique carries out and confirm.

In the Te Kaiping 2-55235 communique, give temperature distribution in order to give the mould in the cooling, at the mould localized design rag of contact thermal source.But this invention does not distinguish positive controlled temperature to distribute to heat-processed, process of cooling, so can not reliably carry out temperature distribution control exactly.

Summary of the invention

The objective of the invention is to, during the heating of the opticglass blank inside that need be shaped by positive control and the temperature distribution during cooling, solve above-mentioned existing issue.Particularly, provide a kind of manufacturing process and building mortion, the temperature of optical glass device during its cooling of in the past noticing by control is not only also controlled from being heated to the refrigerative transition temperature and is distributed, and solves the problems referred to above.

In order to achieve the above object, the manufacturing process of a kind of optical glass device that the 1st mode of the present invention relates to, configuration opticglass blank between the shaping dies that constitutes by a pair of relative mold and bed die, in the described shaping dies of heating, described opticglass blank heating is become can the mobile state, by making described shaping dies approaching relatively, carry out die forming, described shaping dies is separated with described opticglass blank, take out described opticglass blank, it is characterized in that, be different from the temperature adjustment component that the material of thermal conductivity of the material of shaping dies constitutes by configuration in the formed space, inside of at least one side in mold and bed die by thermal conductivity, when described heating, during described cooling, or during described heating and during cooling, give temperature distribution for described shaping dies.

Like this, by giving temperature distribution, can obtain high-precision optical glass device to shaping dies.

The manufacturing process of the optical glass device that the 2nd mode of the present invention relates to is the manufacturing process as the described optical glass device of the 1st mode, it is characterized in that, from described opticglass blank owing to described shaping dies begin distortion near the described mold pressing followed relatively, the time till making described shaping dies and described opticglass blank separates after the described cooling was more than or equal to 50 seconds.

The manufacturing process of the optical glass device that the 3rd mode of the present invention relates to is the manufacturing process as the described optical glass device of the 1st mode, it is characterized in that, the described mold pressing of carrying out described opticglass blank adds man-hour, utilizes gas that described shaping dies is heated with the mutually non-touching part of described opticglass blank or cools off.

The manufacturing process of the optical glass device that the 4th mode of the present invention relates to is the manufacturing process as the described optical glass device of the 1st mode, it is characterized in that, give the temperature distribution that the central part temperature is higher than peripheral part for described shaping dies, described optical glass device is shaped.

The manufacturing process of the optical glass device that the 5th mode of the present invention relates to is the manufacturing process as the described optical glass device of the 4th mode, it is characterized in that, give the temperature distribution that described central part temperature is higher than peripheral part for described shaping dies, following optical glass device is shaped: the length of the direction parallel with making the relative approaching direction of described shaping dies of peripheral part is longer than central part.

The manufacturing process of the optical glass device that the 6th mode of the present invention relates to is the manufacturing process as the described optical glass device of the 1st mode, it is characterized in that, give the temperature distribution that the central part temperature is lower than peripheral part for described shaping dies, described optical glass device is shaped.

The manufacturing process of the optical glass device that the 7th mode of the present invention relates to is the manufacturing process as the described optical glass device of the 6th mode, it is characterized in that, give the temperature distribution that described central part temperature is lower than peripheral part for described shaping dies, following opticglass blank is shaped: the direction parallel of peripheral part with making the relative approaching direction of described shaping dies be shorter in length than central part.

The manufacturing process of the optical glass device that the 8th mode of the present invention relates to is the manufacturing process as the described optical glass device of the 1st mode, it is characterized in that the tangent line of described shaping dies and the forming face of described opticglass blank contact and the angle maximum value that forms perpendicular to the plane that makes the relative approaching direction of described shaping dies are more than or equal to 15 degree.

The building mortion of a kind of optical glass device that the 9th mode of the present invention relates to, configuration opticglass blank between the shaping dies that constitutes by a pair of relative mold and bed die, in the described shaping dies of heating, described opticglass blank heating is become can the mobile state, by being connected, described shaping dies carries out die forming recently, described shaping dies is separated with described opticglass blank, take out described opticglass blank, it is characterized in that, the material of thermal conductivity that thermal conductivity is different from the material of described shaping dies is set in the formed space, inside by at least one side in described mold and described bed die constitutes temperature controlling unit, give temperature distribution for described shaping dies.

Like this, temperature controlling unit gives temperature distribution for described shaping dies, can obtain high-precision optical glass device thus.

The building mortion of the optical glass device that the 10th mode of the present invention relates to is a building mortion of weighing described optical glass device as the 9th mode, it is characterized in that, described temperature controlling unit contacts described shaping dies and is used for fixing the spindle unit of this shaping dies.

The building mortion of the optical glass device that the 11st mode of the present invention relates to is as the building mortion of the described optical glass device of the 9th mode, it is characterized in that, described temperature controlling unit has heating unit.

The building mortion of the optical glass device that the 12nd mode of the present invention relates to is the building mortion as the described optical glass device of the 10th mode, it is characterized in that the amount of heat transfer of described temperature controlling unit is greater than the amount of heat transfer of transmitting that contacts by described shaping dies and described spindle unit.

The building mortion of the optical glass device that the 13rd mode of the present invention relates to is the building mortion as the described optical glass device of the 9th mode, it is characterized in that described temperature distribution is given the unit and made in gas or near the path of the liquid described shaping dies of being located at the spindle unit that is used for fixing described shaping dies and circulate.

The building mortion of the optical glass device that the 14th mode of the present invention relates to is the building mortion as the described optical glass device of the 9th mode, it is characterized in that, described shaping dies is configured in that to be parts cylindraceous approximately be telescopic inside, and has from the luminous energy heating unit of the described shaping dies of described sleeve outside heating.

The building mortion of the optical glass device that the 15th mode of the present invention relates to is as the building mortion of the described optical glass device of the 14th mode, it is characterized in that, described sleeve is formed with a plurality of breather holes.

The building mortion of the optical glass device that the 16th mode of the present invention relates to is the building mortion as the described optical glass device of the 14th mode, it is characterized in that, described luminous energy heating unit is made of the two or more luminous energy heating units corresponding to described mold and bed die, and described sleeve has the adiabatic border corresponding to described mold and bed die simultaneously.

Description of drawings

Fig. 1 is the sectional view of expression manufacturing process of the present invention.

The sectional view that vector when Fig. 2 is the expression shaping changes.

Fig. 3 is illustrated in the sectional view of giving the vector when being shaped under the temperature distribution state.

Fig. 4 is a sectional view of representing the problem points of shaping in the past.

Fig. 5 is the sectional view that expression utilizes molding condition of the present invention to form.

Fig. 6 is the sectional view of the building mortion of embodiments of the present invention 1.

Fig. 7 is the sectional view of the building mortion of embodiments of the present invention 2.

Fig. 8 is the sectional view of the building mortion of embodiments of the present invention 3.

Fig. 9 is the sectional view of the building mortion of embodiments of the present invention 4.

Figure 10 is the sectional view of the building mortion of embodiments of the present invention 5.

Figure 11 is the sectional view of the building mortion of embodiments of the present invention 6.

Figure 12 is the sectional view of the building mortion of embodiments of the present invention 7.

Figure 13 is the sectional view of the building mortion of embodiments of the present invention 8.

Figure 14 is the sectional view of the building mortion of embodiments of the present invention 9.

Figure 15 is the sectional view of the building mortion of embodiments of the present invention 10.

Embodiment

Below, use Fig. 1～Fig. 5 that principle of the present invention is described.Shaping dies shown in Figure 1, be the relative rotational symmetric shape of optical axis, it is used to the following biconcave lens that is shaped: the central part thickness of this biconcave lens optical axis direction is that the thickness that 1mm contacts the outermost perimembranous of shaping dies is 4mm, diameter is 15mm, the mold 51 of this shaping dies and bed die 52 relative configurations.The forming face 51a of the mold 51 of upside is an aspherical shape, and the forming face 52a of the bed die 52 of downside is a spherical shape.The shape that needs the optical glass device of shaping also can be the shape beyond the rotation symmetric shape shown in Figure 1, for example, also can be that prism and binary optical elements etc. form toric non-rotating symmetric glass elements shape or other shapes.

Between mold 51 and bed die 52, insert and put opticglass blank 55, begin to they heating.Before the beginning mold pressing, under mold 51 and bed die 52 and opticglass blank 55 state of contact, heat, but after heating finishes, also can make mold 51 contact optical glass blanks 55.The opticglass blank 55 that need to be shaped be shaped as two planar cylindrical shapes, but, the shape and the kind of opticglass blank 55 are not done special qualification as long as what are different for opticglass blank 55 and the shape when finishing of being shaped.

The glass transition point of opticglass blank 55 for example is 510 ℃, and the viscosity of this moment is 10 ^12.75Poise, softening temperature for example are 595 ℃, and the viscosity of this moment is 10 ^7.65Poise, this interval temperature-viscograph linearly changes approximately.Give this opticglass blank 55 and mold 51 and bed die 52 heating, begin mold pressing when reaching 555 ℃ more than or equal to 550 ℃, optical axis center (face top) portion of the forming face 51a of mold 51 in the temperature of opticglass blank 55.At this moment, the outermost perimembranous temperature of forming face 51a, the 52a of predetermined mold 51 that contacts with opticglass blank 55 and bed die 52 is set at 548 ℃.

The used plus-pressure F of mold pressing for example is 2000N/cm ²In pressurization, heated opticglass blank 55 begins distortion, along mold 51 and bed die 52, between forming face 51a, the 52a of mold 51 and bed die 52 and the opticglass blank 55 that is in contact with it, carry out heat exchange, the temperature limit of opticglass blank 55 is with the temperature that changes into thermal capacity much bigger mold 51 and bed die 52, and expansion is extended to peripheral direction in opticglass blank 55 limits.

Fig. 1 represents just to begin the state after the mold pressing, the opticglass blank 55 that is positioned at the forming face 51a central part of mold 51 does not produce flowing to outer circumferential side substantially, so accept plus-pressure F perpendicular to the tangential direction of mold 51, produce reactive force F ', but because viscosity degradation, so F＞F ', opticglass blank 55 begin distortion.

Below, utilize Fig. 2, to opticglass blank 55 owing to mold pressing is expanded, (contact part of the mold 51-opticglass blank 55 of this moment is made as an A) when the tangent line of forming face is 20 ° with the angle θ that forms perpendicular to the plane of optical axis, the situation when forming by the uniform temperature of implementing in the past describes.

Among Fig. 2, the distance center position is far away more, and the reactive force after the decomposition is more little, with the reactive force F of centre portions " compare, the reactive force F of some A becomes very little.This is because compare with the centre portions of opticglass blank 55, has the peripheral part (the non-shaping dies contact part of opticglass blank 55) that discharges at outer peripheral portion, so mobile degree of freedom height.In addition, the length of the direction parallel with making the relative approaching direction of shaping dies is during than the center minister, and the area of release will become greatly, and the pressure that acts on forming face reduces.Equally, the relative angle θ that forms perpendicular to the plane of peripheral part optical axis is big more, and is more little from the reactive force of opticglass blank 55.In addition, when this angle θ surpassed predetermined angular, opticglass blank 55 can leave forming face sometimes.

As a result, near peripheral part the time, can not obtain guaranteeing the pressure of the forming face precision of wishing in the past.Fig. 3 represents that use compared with the past given the method for the present invention that the shaping dies of temperature distribution carries out mold pressing.

Give the temperature distribution of mold 51, hang down 3 ℃ relatively than the optical axis center position of mold 51 at the some A of mold shown in Figure 3 51.At this moment, carry out heat exchange at an A by the opticglass blank 55 that contacts with forming face 51a with mold 51, compare with the central position, temperature descends, and viscosity uprises, so the mobile degree of freedom reduces.The reactive force F that therefore, can add a little bigger A.That is, can increase molding pressure, improve accuracy of repetition forming face.When particularly the angle that forms perpendicular to the plane of optical axis relatively of the tangent line of forming face is more than or equal to 15 °, compare, produce appreciable results with Fig. 2.

The present invention is in order to reduce glass viscosity, and the forming face temperature when making heating and mould pressing, the temperature distribution of the mould that is shaped are dynamic change, like this, at central part and peripheral part, can control opticglass blank 55 and act on the pressure of forming face.Here, because the ideal temperature difference of central part and periphery is very big with the change of shape of the volume of the visco-elasticity of the glass of mold pressing and mold pressing speed, opticglass blank 55 and forming face, so do not do special stipulation, but wish to give at least the temperature head more than 2 ℃ greater than the temperature measuring error.

For example, under the situation of peripheral part thickness less than near the convex lens of the thickness the central part of shaping form, along with the variation of the relative distance of mold 51 and bed die 52, it is big more to the distance of diametric(al) expansion to arrive peripheral part more.Promptly, the velocity of flow of opticglass blank 55 accelerates, but the flow direction of opticglass blank 55 is relative direction with the mold pressing direction of forming face (for example 51a), the resistance of expansion increases simultaneously, so by improving the peripheral part temperature, can reduce the compacting pressure of model forming module, also can guarantee the forming face precision of peripheral part simultaneously.

After the abundant distortion of opticglass blank 55 finishes, change the operation that begins to cool down over to.Operation till this has had by composing the temperature distribution of giving shaping dies and has given the effect of temperature distribution for opticglass blank 55.As in the past, after beginning to cool down, begin to give the method for temperature distribution again,, will inevitably cause cycle stretch-out by part cooling or undesirable the part heating of implementing, consider from the stable aspect of guaranteeing surface accuracy in addition, become the possibility height of labile factor.Relative therewith, the temperature distribution former state ground that method of the present invention can the time be given heating or change next procedure over to steady state by continuously changing distribution shape promptly reduces the refrigerating work procedure of temperature.Distribution may not be leaveed no choice but change, but temperature distribution according to the present invention is given the unit, can the stability product polar region changes the control of temperature distribution.

At refrigerating work procedure,, at equal temperature states, promptly be shaped mould and opticglass blank when not having to begin to cool down under the state of temperature head, can produce the fatal problem that the spy holds Fig. 4 explanation that utilizes this communique in the flat 2-55235 communique as in the past.Shown in Figure 4 as this communique, owing to the shrinkage that the thickness of glass difference based on central part and peripheral part produces is poor, the glass and the mould of peripheral part are peeled off.At this moment, if glass viscosity is fully high,, is actually in the viscosity inadequate state of cooling that rises and peels off, so can not obtain desirable accuracy of repetition though can not reduce the accuracy of repetition of forming face.

In the past,, when giving temperature distribution, periphery do not control especially to the central part of the opticglass blank of contact shaping dies.And method of the present invention is different therewith, energetically the temperature distribution of giving shaping dies is controlled, thereby can be addressed the above problem.

Fig. 4 is used to illustrate this point, and when the mold pressing that expression utilizes shaping dies to carry out finished, the scope that opticglass blank 55 extends to hope began to cool down preceding state.Before the mold pressing of opticglass blank 55 expansion finishes, carry out stepless control, making the central part temperature is that 555 ℃, peripheral part temperature are 545 ℃, pressure identical state when keeping with mold pressing.

Bulk temperature reduces along with the process of cooling time, and finally reaching can not the mobile state.In this process, utilize the temperature distribution give, can produce and make that central part can flow, peripheral part can not the mobile state.At this moment, the contraction of corresponding peripheral part can make the further continuous deformation of central part, so that peeling off of forming face that the contraction because of peripheral part causes and opticglass blank 55 do not taken place.Strictly say, a little flowing arranged, can prevent above-mentioned peeling off to peripheral part by beginning to stop flow state from the position of leaving the peripheral part forming face.

The flow control of utilizing this temperature distribution to carry out not only can prevent peeling off of forming face 51a, 52a and opticglass blank 55 simply, the molding crackle that produces in the time of also can preventing to cool off.That is, when diagram forming face shape has been carried out mold pressing, cooling with in the past uniform temperature, because this shape is former thereby produce change of shape (for example " warpage ") when cooling.This phenomenon is because on the plane perpendicular to the optical axis 53 of shown in Figure 5 molding of hypothesis with respect to the face top mid point at interval by shaping dies up and down, aspheric surface lateral extent L1 is different with sphere lateral extent L2, when producing stress in the cooled opticglass blank of uniform temperature 55, the unrelieved stress of aspheric surface side causes greatly.Relative therewith, the present invention is difficult for producing aforementioned " warpage ".This is owing to can produce in when cooling and flow, thereby is stress control minimum state, thereby can reduce internal modification significantly.Under this state, fully cool off, make mold 51 and bed die 52 not produce the regional relative separation of glass flow, need to obtain the optical glass device of shaping.

The present invention is after the heating of opticglass blank finishes, make shaping dies approaching relatively, the opticglass blank begins distortion, mold pressing is cooled off after finishing, the either party leaves from the opticglass blank in making shaping dies, the required time, continues to implement energetically temperature distribution at this therebetween approximately more than or equal to 50 seconds.Like this, can solve the existing issue that temperature distribution disappears at short notice.

The present invention distributes by controlled temperature, can utilize opticglass blank 55 interior residual stress state to make " warpage " of the opticglass blank 55 of the easy demoulding under the state of the accuracy of repetition that keeps forming face.That is, by using the positive change unit of the temperature distribution of shaping dies up and down, may be controlled to the flow state, the stress that produce in the shape product to produce direction and generating capacity thereof.

Below, the effect in the state of cooling of convex lens shape is described.Convex lens are opposite with concavees lens, in process of cooling, to give central part is that the high temperature distribution state of temperature of the part that temperature is low, peripheral part thickness is little of the big part of thickness cools off, even thereby produce when shrinking at central part viscosity height, under can not flow state, but peripheral part still is in flow state, and glass is expanded to peripheral part, therefore can be prevented peeling off of forming face and glass.In addition, when evenly cooling promptly kept cooling off under the state of temperature distribution, even forming face is evenly cooled off, the glass of central part caused cooling to lag behind owing to the thermal capacity difference that produces because of its shape in the past, and last central part shrinks.Thereupon, because peripheral part and central part stretch mutually, make the molding breakage.This situation was mainly in for the shortening cycle carries out the refrigerative occasion at short notice, but by utilizing the present invention, can prevent this breakage.In addition,, not only can prevent the breakage of molding simply, can also control the quantity and the position thereof of defective of the optical surface of molding by implementing positive temperature distribution of the present invention control.

Below, utilize illustrated embodiment to specify the present invention.Give same label to parts identical in each embodiment.

Embodiment 1

Fig. 6 represents to give the building mortion of the embodiment 1 of temperature distribution.

Mold 1 and bed die 2 are to be formed by the material (for example, superhard alloy, SIC etc.) that has sufficient intensity in shaping opticglass blank 20 required temperature provinces.These moulds 1,2 connect upward axle 5 and the lower shaft 6 that relatively drives mould by annex (attachment) 16,17.For convenience of explanation, the forming face shape of mold 1 and bed die 2 adopts the plane, but forming face can be any shape of liking.

Inside at mold 1 and bed die 2 forms space 3 and space 4.This space 3,4 is formed at the substantial middle part of each mould 1,2.Be filled with in the space 3,4 than the little material of material thermal conductivity that constitutes mould 1,2, for example high density aluminum oxide etc.As long as thermal conductivity and thermal capacity less than the thermal conductivity of the material that constitutes shaping dies, can distribute at desired temperatures described later, suitably select best materials.

Thermocouple 10, thermocouple 11 are inserted in inside at mold 1, bed die 2.Around near mold 1 atmosphere process furnace 8 is set,, atmosphere process furnace 9 is set on every side near mold 2 equally as heating unit.Heating unit needn't be defined in atmosphere process furnace 8,9, also can use replacements such as lamp well heater.Be divided into two atmosphere process furnace 8,9 for shaping dies about the correspondence, if but do not need to adjust the temperature of mould 1,2 up and down, an atmosphere process furnace also can be used.These atmosphere process furnace 8,9 carry out temperature control by thermocouple 12,13.

In last axle 5 and lower shaft 6, form cooling channel 18,19,, can control the temperature of mold 1 and bed die 2 by heat-eliminating medium being offered cooling channel 18,19.

In this embodiment, at first utilize not shown mode that opticglass blank 20 is placed on the bed die 2, make by the upward axle 5 of annex 16 connection molds 1 approaching relatively with the upward axle 6 that is connected mold 2 by annex 17, with clamping opticglass blank 20, utilize atmosphere process furnace 8,9, use thermocouple 10,11 controlled temperature, give mold 1, bed die 2 and 20 heating of opticglass blank.

Reach under the state of desired temperatures by radiant heat at mold 1, bed die 2 and opticglass blank 20, (for example use not shown driver element, use the straight moving direction driving mechanism of straight ejector half cylinder and servomotor and ball-screw) pressurize, thus carry out mold pressing, the shaping of opticglass blank 20.Then, make mold 1 and bed die 2 be close to desired location after, stop the heating that to utilize atmosphere process furnace 8,9 to carry out, begin to cool down.

Meanwhile, make the cooling channel 18, the cooling channel 19 that are in before this under the closed gas state flow through heat-eliminating medium, thereby begin to cool down.Used heat-eliminating medium is to be pressurized to 20N/cm ²Pure water, but, also can use the big oil of thermal capacity according to the speed of cooling of expectation, for example, ISO V618 level Dormant oils, or little water vapour of thermal capacity and nitrogen etc.During heating, need control the temperature that the temperature that makes axle 5, lower shaft 6 does not rise to the strength of materials reduction that is higher than axle 5, lower shaft 6 according to the constituent material kind (for example SUS304) of last axle 5 and lower shaft 6.Under this situation, by be provided for measuring the not shown thermocouple of temperature at last axle 5 and lower shaft 6, make cooling channel 18,19 flow through a little heat-eliminating medium, suppress the over-drastic temperature and rise.These method of cooling equally also are applicable to following each embodiment.

After beginning to cool down, the thermal energy transfer after being heated is given mould 1,2, and is delivered to outside the system by the heat-eliminating medium at cooling channel 18,19 internal recycle of last axle 5, lower shaft 6 inside.At this moment, the temperature distribution of the opticglass blank 20 that contacts with mold 1 and bed die 2, according to the constitutional features of shaping dies, heat is captured by peripheral part, and with respect to central part, the peripheral part temperature reduces.The material that is filled in the space 3,4 was heated to temperature much at one at 1,2 o'clock at heating mould, because thermal conductivity is low, so can make central part remain high-temperature.

Shaping dies begins to cool down, by the thermal conduction to axle 5,6, temperature begins to reduce, owing to be filled in the thermal conductivity of the thermal conductivity of the material in the space 3,4 less than the material that constitutes shaping dies, so the temperature of shaping dies reduces relatively, its temperature reduces hysteresis.Like this, compare, can make central part keep high temperature, can set the temperature distribution amplitude greatlyyer with the temperature of shaping dies peripheral part.In addition, because the shape difference of shaping dies volume inside 3,4, the temperature distribution state of the forming face that contacts with the opticglass blank 20 that is molded can change, so by come the shape of free setting space 3,4 according to the optical element shape of expectation, adjust speed of cooling, as a result, the temperature amplitude and the distribution shape that distribute of design temperature arbitrarily.

Embodiment 2

Fig. 7 represents the building mortion of embodiments of the present invention 2.The difference of present embodiment and embodiment 1 is: insert configuration thermal conduction axle 14,15 as temperature adjustment component in mold 1 and bed die 2 volume inside 3,4.

Axle 5, lower shaft 6 on the wherein side contacts of thermal conduction axle 14,15, opposite side contact mold 1, bed die 2.Under this situation, thermal conduction axle 14,15 is configured to contact the state of the central part of mould 1,2.

Thermal conduction axle 14,15 inserts and is entrenched on axle 5, the lower shaft 6.The thermal conductivity of the material of thermal conduction axle 14,15 is preferably greater than or probably is equal to the used material of mould 1,2, as long as have the thermal conductivity about 7kcal/mh ℃ at least, just can give full play to effect.As material, for example, shaping dies 1,2 is the superhard alloy material, and the material of thermal conduction axle 14,15 is lower than the combination of aluminum oxide of superhard alloy etc. so long as not thermal conductivity, and is just no problem.

In addition, in the embodiment 1, form the structure that mold 1 and bed die 2 directly contact axle 5, lower shaft 6, but the structure of present embodiment is: mold 1 and bed die 2 float slightly from last axle 5, lower shaft 6, fix by annex 16,17, so correspondingly the length of thermal conduction axle 14,15 has also been grown so much.

In the present embodiment, identical with embodiment 1, opticglass blank 20 is clipped between mold 1 and the bed die 2, use atmosphere process furnace 8,9 to give mold 1 and bed die 2,20 heating of opticglass blank.When mold 1 and bed die 2 reach the temperature of hope, make both approaching relatively, mold pressing opticglass blank 20.

At this moment, thermal conduction axle 14,15 is positioned at mould 1,2 inside, thereby the temperature distribution of mould 1,2 forming faces in when heating is that central part is lower than peripheral part.This is that temperature is low because of not having heating unit in last axle 5, the lower shaft 6, and by the thermal conduction axle 14,15 that contacts with the inboard part that is equivalent to mould 1,2 forming face central parts, heat is axially captured.The central part temperature was lower than the temperature distribution of peripheral part when like this, present embodiment can be given heating.

Behind the die forming,, make the heat-eliminating medium that circulates in axle 5, the cooling channel 18,19 of lower shaft 6 in order to cool off.As a result, the temperature of last axle 5, lower shaft 6 reduces rapidly, and thermal conduction axle 14,15 is cooled then, and the inboard temperature of mould 1, the 2 forming face central parts of its top contact reduces.That is, opposite with embodiment 1, the central part temperature is lower than the distribution of peripheral part in the time of can realizing cooling off.

After beginning to cool down, by energising that does not stop atmosphere process furnace 8,9 and the temperature that is controlled to be hope, the peripheral part of heating mold 1, bed die 2, and utilize the heat exchange of the heat-eliminating medium that passes through from cooling channel 18,19 to cool off simultaneously, can give temperature amplitude wideer distribution thus.

In this embodiment, the bottom surface of mould 1,2 does not directly contact with last axle 5, lower shaft 6, but in order to obtain above effect, is not allow the part contact.The bottom surface of supposing mould 1,2 contacts with a part that goes up axle 5, lower shaft 6, can not produce in contact area under the heat passage situation of the thermal capacity of transmitting above thermal conduction axle 14,15, just can obtain above-mentioned effect.Therefore, the effect of being carried out temperature distribution by thermal conduction axle 14,15 can be adjusted in the bottom surface by adjusting mould 1,2 and last 5, the contact area of lower shaft 6.

Embodiment 3

Fig. 8 represents the building mortion of embodiments of the present invention 3.Present embodiment is at the space of embodiment 13,4 internal configuration thermal conduction axles 14,15, for example inserts cartridge heater 22,23 simultaneously as heating unit in thermal conduction axle 14,15.

Different with embodiment 2, the thermal conduction axle 14,15 that is inserted with cartridge heater 22,23 is inserted in the space 3,4 of mold 1, bed die 2, not only contact the forming face inboard of mould 1,2 closely, also form mould 1, the 2 lateral states that are entrenched in slightly simultaneously.

In the present embodiment, set the least possiblely with last axle 5, contacting of lower shaft 6 thermal conduction axle 14,15.This is for heat passage the be suppressed to inferior limit of handle with last axle 5, lower shaft 6.Therefore, if desired, also can thermal conduction axle 14,15 and on axle 5, insert thermal insulation material etc. between the lower shaft 6.

In the present embodiment, at first utilize not shown mode that opticglass blank 20 is clipped between mold 1 and the bed die 2, utilize atmosphere process furnace 8,9 to heat.At this moment, also use cartridge heater 22,23 to heat simultaneously.Its advantage is: can shorten mould 1,2 heating-up time, can heat giving under the temperature distribution state that the central part temperature is higher than peripheral part.At this moment, can utilize the well heater output of atmosphere process furnace 8,9 and the output balance of cartridge heater 22,23 to change temperature distribution, so output by cartridge heater 22,23, can shorten the heating-up time of mould 1,2, and formation and embodiment 1 opposite temperature distribution is the heated condition that the central part temperature is higher than peripheral part.

After reaching the temperature of hope, make mould 1,2 approaching relatively with mold pressing opticglass blank 20.At this moment, the design temperature of atmosphere process furnace 8,9 is controlled to be high temperature to the temperature of the cartridge heater 22,23 in the thermal conduction axle 14,15 relatively, and the temperature distribution of forming face is that central part is higher than peripheral part when making heating thus.

Then,, reduce or stop the output of atmosphere process furnace 8,9, make the heat-eliminating medium that in the cooling channel 18,19 of last axle 5, lower shaft 6, circulates in order to begin to cool down.Like this, the temperature of last axle 5, lower shaft 6 reduces rapidly, but thermal conduction axle 14,15 is set the least possiblely with last axle 5, contacting of lower shaft 6, and the side inboard and contact slightly of the forming face of the mould 1,2 of thermal conduction axle 14,15 contacts is not directly cooled off by last axle 5, lower shaft 6.In addition, by the cartridge heaters 22,23 in the thermal conduction axle 14,15 are remained the condition of high temperature,, can continue to give and make central part be kept above the temperature distribution of mould 1,2 peripheral parts though system is being cooled off as a whole.

Embodiment 4

Fig. 9 represents the building mortion of embodiments of the present invention 4.The mould 1,2 of present embodiment is inserted in the inner chimeric accurately sleeve that can slide 21.Sleeve 21 is cylindric, and is fixed on the mold 1.So-called sleeve is meant and roughly is parts cylindraceous, though sleeve 21 so long as roughly be parts cylindraceous and get final product, is a cylinder-like part herein.Heating unit uses luminous energy, specifically uses infrared(ray)lamp well heater 28,29.Use the heating unit of luminous energy also can use short wavelength's lamp well heater or laser.

Present embodiment is used silica tube 7, and mould 1,2 and perimeter systems are inserted in by silica tube 7 and remain in the space of airtight conditions.Like this, under the condition of high temperature, can under by rare gas element, the non-oxidizing atmosphere that for example forms, form, so, also can reduce extent of corrosion significantly even use oxidized material under the high temperature by nitrogen.In addition, infrared(ray) lamp well heater 28,29 is configured in the outside of silica tube 7, and the temperature sensor that is provided for controlling the output of infrared(ray) lamp well heater 28,29 nearby is a thermocouple 12,13.

In the present embodiment, the side of mould 1,2 sides and sleeve 21 be not whole chimeric, but only some is chimeric.This is because when beginning to cool down after finish being shaped, if the big sleeve 21 of thermal capacity is chimeric with the whole side of mould 1,2, compares with embodiment 1, is difficult to reduce the temperature distribution of peripheral part.By adopting this structure, can easily by sleeve 21 up and down the driving precision of mould 1,2 be that the eccentric precision ground of optical glass device remains under the high-precision state, carry out the temperature distribution that the central part temperature is higher than peripheral part and control.

During less than the thermal conductivity of the material of mould 1,2, the length of adjusting telescoping part according to thermal conductivity gets final product in the thermal conductivity of the material that constitutes sleeve 21.

Embodiment 5

Figure 10 represents the building mortion of embodiments of the present invention 5.Present embodiment is based on embodiment shown in Figure 72, but with the difference of embodiment 2 is: use sleeve 21, use infrared(ray) lamp well heater 28,29 to form under the airtight conditions that is formed by silica tube 7.

With the something in common of embodiment 2 be: thermal conduction axle 14,15 is inserted in mould 1,2 inside, can set inboard temperature to such an extent that be higher than the temperature of the peripheral part of mould 1,2 forming faces.The side of sleeve 21 and mould 1,2 forms the structure that increases chimeric area as far as possible.Therefore, even emit under the state that heat energy promptly is cooled, also can realize the control that the distribution temperature amplitude is big thus with 21 heating of infrared(ray) lamp well heater 28,29 heating muffs in opticglass blank integral body.

Embodiment 6

Figure 11 represents the building mortion of embodiments of the present invention 6.Present embodiment is inserted thermal conduction axle 14,15 inside to cartridge heater 22,23 respectively and is used as heating unit with respect to embodiment shown in Figure 10 5.

By cartridge heater 22,23 is set, can heat internally, compare with embodiment 5, can realize the control that the distribution temperature amplitude is big.

Embodiment 7

Figure 12 represents the building mortion of embodiments of the present invention 7.Present embodiment is with respect to embodiment shown in Figure 94, utilizes the rare gas element G that fills or flow through when cooling, nitrogen for example, and the mould 1,2 and the opticglass blank 20 of contact part do not cool off to mould 1,2 forming faces and opticglass blank 20.

Cylindric sleeve 21 is penetrated with a plurality of breather hole 21a at thickness direction, and forming gas can be at the state of sleeve 21 inside and outside circulations.In embodiment 1～6, the heat distribution of the forming face of mould 1,2 passes to opticglass blank 20 and carries out temperature distribution, but in the present embodiment, utilize rare gas element G to control forming face and opticglass the blank 20 not mould 1,2 of contact part and the temperature of opticglass blank 20 more energetically, thus can be when heating or give degree of freedom higher temperature distribution during cooling.

The gases used forming face that may not only control mould 1,2 and opticglass blank 20 be the temperature of contact part not, also can by and the side of the surface of sleeve 21 or mold 1, bed die 2 between produce heat exchange, the temperature distribution of control opticglass blank 20.

Present embodiment has been used rare gas element, but if operable mould in the oxidizing atmosphere then need not be rare gas element.As gas, carry out heat exchange by contacting not shown temperature control unit, can reach necessary temperature, this temperature control unit is used to cool off or is heated to the temperature that can exert an influence to the part of the hope wanting to change.

Embodiment 8

Figure 13 represents the building mortion of embodiments of the present invention 8.Present embodiment for embodiment shown in Figure 16, the structure difference of sleeve 21.That is, the sleeve 21 of present embodiment is provided with adiabatic border 24 between the sleeve part of the sleeve part of corresponding mold 1 and corresponding mould 2.Even in embodiment 6, control lamp well heater 28,29 respectively for the temperature distribution of wishing or temperature distribution control, but the thermal conduction that utilizes sleeve 21 still can not to mould 1 and mould 2 provide hope temperature variation the time, can realize this target by adiabatic border 24 is set in sleeve 21.

The adiabatic border 24 of sleeve 21, for example, can be by making thickness attenuation or perforate reduce sectional area or being provided with by modes such as the low material of thermal conductivity connect.Like this, by adiabatic border 24 is set, can reduce as the effect that connects the heat transfer component between the mould 1,2.

Embodiment 9

Figure 14 represents the building mortion of embodiments of the present invention 9.In the present embodiment 9, the biconcave lens of the rotation symmetric shape that is shaped is used as optical glass device.

Utilizing superhard alloy to be made into the shape mould is mold 1 and bed die 2, and the diameter (φ) that forms separately is 30mm, and the diameter of forming face 1a, 2a (φ) is 27mm, and radius-of-curvature (R) is the convex shape of 25mm.Mould 1,2 is fixed on axle 5, the lower shaft 6 by annex 16,17 respectively.In last axle 5, lower shaft 6, form cooling channel 18,19, blanketing gas (N before shaping ₂).

Mould 1,2 is inserted into cylindric sleeve 21 inside with chimerism slidably, and chimeric gap is that the diameter difference is 5 μ m.The material of sleeve 21 is used porous matter aluminum oxide.Centre portions at mould 1,2 forms cylindric space 3,4 respectively.Thermocouple 10,11 is inserted in inside at mold 1, bed die 2, at cylindric space 3,4 internal configuration thermal conduction axles 14,15.

As shown in the figure, the inboard and last lower shaft 5,6 that forms with forming face 1a, 2a of thermal conduction axle 14,15 has the shape of contact surface.The material of thermal conduction axle 14,15 uses stainless steel (SUS304).Dispose the small- sized cartridge heater 22,23 that is output as 600w respectively in thermal conduction axle 14,15 inside.Sleeve 21 is not whole with mould 1,2 sides and contacts, but towards direction of principal axis the noncontact part that length is 20mm is set from forming face 1a, 2a.

Between last axle 1 and lower shaft 2, utilize not shown mode to insert opticglass blank 20, form with the 30N load by the state of mold 1 and bed die 2 clampings.Opticglass blank 20 is glass material L-LAH53, is that diameter is that 25mm, thickness are the cylindric of 7mm, and two ends form the plane lapping face.

By mould 1,2 and sleeve 21, axle 5,6 systems that constitute, be configured in the closed structure that the airtight member by silica tube 7 and not shown above-below direction forms.In addition, add up to the infrared(ray) lamp well heater 28,29 that is output as 4000W in the arranged outside of silica tube 7, being used to carry out temperature controlled thermal sensor is near thermocouple 12,13 is arranged on.

In the embodiment 9, be the air displacement in the enclosed space rare gas element (nitrogen) at first, a continuous flow inflow-rate of water turbine is the volume of 10L/min, and one side utilizes lamp well heater 28,29 to heat.Meanwhile, begin heating with cartridge heater 22,23.During heating, at first make the mensuration temperature of thermocouple 10,11 be warmed up to 600 ℃.

When arriving 600 ℃, carry out the balance adjustment, making the ratio of the total output W number of the total output W number of lamp well heater 28,29 and cartridge heater 22,23 is 1: 1.2 (about 1000W of total output of lamp well heater 28,29, the total of cartridge heater 22,23 is exported (one-sided) about 600W), and lasting heating reaches 610 ℃ up to thermocouple 10,11.When the temperature of thermocouple 10,11 reached 610 ℃, the temperature of the face top portion of forming face 1a, the 2a of mould 1,2 was 612 ℃, and effectively the diameter of the outermost perimembranous of forming face is that the surface temperature of 27mm position is 604 ℃.

After carrying out above heating,, utilize the combination of not shown drive unit, for example cylinder and servomotor and ball-screw, make mold 1 relative approaching with bed die 2 with the 8000N load in order to begin mold pressing.

At this moment, because of the temperature of the opticglass blank 20 of mold pressing before beginning to be out of shape is actually 608 ℃, but forming mobile simultaneously by mold pressing, become 610 ℃ from the temperature of face top portion of forming face 1a, the 2a of mould 1,2 towards opticglass blank 20 inner 1mm positions, after 30 seconds, the range extension that forming face 1a, 2a is contacted by mold pressing with opticglass blank 20 arrives diameter 20mm position, and the temperature of forming face 1a, the 2a of the mould 1,2 of this position reaches 606 ℃.After 5 seconds, the temperature that rises towards opticglass blank 20 inner 1mm positions in this position reaches 605 ℃ again.Be reduced to 700W to the output of the total of lamp well heater 28,29 this moment, and proceed mold pressing.

After about 100 seconds, the mould 1,2 that relatively moves is that the interval of forming face 1a, 2a reaches 1mm up to mold pressing end position place, and the outermost perimembranous that opticglass blank 20 arrives forming face 1a, the 2a of mould 1,2 is diameter 27mm position.At this moment, from the temperature of forming face towards inner 1mm position of the outermost perimembranous of opticglass blank 20 is 602 ℃, because the speed of opticglass blank 20 expansions is reduced, fully carry out heat exchange, so it reaches the identical temperature of most peripheral surface temperature with effective forming face of mould 1,2.

Change refrigerating work procedure then over to.Begin with flow 2L/min at first that circulating pressure is 50N/cm in cooling channel 18,19 ²40 ℃ of pure water.At once to add up to 20W/sec to reduce the output of lamp well heater 28,29, reduce the output of cartridge heater 22,23 afterwards to add up to 2W/sec.After beginning to cool down about 15 seconds, the face top temperature of forming face 1a, the 2a of mould 1,2 reaches 600 ℃, and the outermost perimembranous of opticglass blank 20 is reduced to 570 ℃.

At this moment, the face top temperature of optical surface still can the mobile temperature, but peripheral part has reached the viscosity zone of flow difficulties.

Afterwards, nitrogen flow is increased to 30L/min and continues cooling.After 30 seconds, relative moulding pressure can the mobile scope disappear in the opticglass blank 20 inner whole zones, and the shape of optical glass device is determined.The face top surface temperature of optical surface is about 560 ℃.

Set according to this temperature condition and to finish when being shaped, can not produce the formed thereby glass bonding in the forming face 1a of mold 1, bed die 2, the distortion on the 2a, opticglass blank 20 can not peeled off from forming face because of outermost perimembranous shrinkage is many yet simultaneously.Though when nitrogen flow is changed to 30L/min, change the flow of cooling channel 18,19, also can control the temperature of mould 1,2 central parts equally, but in embodiment 9, in order to obtain to come the design temperature distribution occasion according to above-mentioned condition towards the balance of the temperature distribution of peripheral part.

Then, make lamp well heater 28,29 and cartridge heater 22,23 be output as zero, the pure water internal circulating load in the cooling channel 18,19 is increased to 10L/min.Even this state continuance is exposed to 200 ℃ that also are not prone to the oxidation affects problem in the air atmosphere to the enclosed space that handle contains mould 1,2.Make mold 1, bed die 2 relative separation then, utilize not shown mode to take out the optical glass device of finishing shaping, finish to be shaped.

Embodiment 9 is that temperature distribution is given a unitary example, can also further carry out various temperature distribution controls energetically.For the purpose of simplifying the description, embodiment 9 is made as identical temperature distribution state to mold 1 with bed die 2, but also can change these conditions, carries out the contraction desirable state, or deliberately reduces or improve the partial copy precision.

Embodiment 10

The biconvex lens of embodiment 10 shaping rotation symmetric shapes is used as optical glass device.Figure 15 represents the building mortion of this embodiment 10, the difference of the building mortion of itself and Figure 14 is little, and the forming face 1a, the 2a that contact with opticglass blank 20 as the mold 1 and the bed die 2 of shaping dies are that diameter (φ) is the concave of 30mm for 27mm, radius-of-curvature (R). Thermal conduction axle 14,15 in being inserted into mould 1,2 and on axle 5, between the lower shaft 6, inserting thickness is the SUS304 system cushion block 31,32 of 1mm, thus make mold 1, bed die 2 directly contact go up axle 5, lower shaft 6.Mold 1 and bed die 2 state to be connected by thermal conduction axle 14,15 utilizes annex 16,17 to be fixed on axle 5, the lower shaft 6.Sleeve 21 usefulness superhard alloys are made, and the side of mould 1,2 all is entrenched on the sleeve 21.

The opticglass blank 20 that is clipped between axle 1 and the lower shaft 2 is glass materials of commodity " VC81 (living field optics system) " by name, and its abrasive surface diameter is that 23.2mm, center wall thickness are that 8mm, top and bottom radius-of-curvature (R) are 25mm, is the biconvex shape.

In this embodiment 10, at first will be replaced into nitrogen in the enclosed space, the volume of a continuous flow inflow-rate of water turbine 5L/min, one side heats with lamp well heater 28,29.Begin heating with cartridge heater 22,23 simultaneously, the mensuration temperature of thermocouple 10,11 is warmed up to 540 ℃.

When arriving 547 ℃, carrying out the balance adjustment, to make the ratio of the total output W number of the total output W number of lamp well heater 28,29 and cartridge heater 22,23 be 6: 1 (about 1200W of total output of lamp well heater 28,29, the total of cartridge heater 22,23 is exported (one-sided) about 100W), and lasting heating reaches 548 ℃ up to thermocouple 10,11.When the mensuration temperature of thermocouple 10,11 reached 548 ℃, the face top portion temperature of forming face 1a, the 2a of mould 1,2 was 549 ℃, and effectively the diameter of the outermost perimembranous of forming face is that the surface temperature of 27mm position is 554 ℃.

After the heating, the beginning mold pressing makes mold 1 relative approaching with bed die 2 with the 6000N load.At this moment, the temperature of the opticglass blank 20 before beginning to be out of shape is actually 547 ℃, but forming mobile simultaneously by mold pressing, become 549 ℃ from the temperature of face top portion of forming face 1a, the 2a of mould 1,2 towards opticglass blank 20 inner 1mm positions, basic identical with forming face 1a, 2a.

Proceed mold pressing, the contact range of 30 seconds postforming face 1a, 2a and opticglass blank 20 expands diameter 20mm position to, and the temperature of optical surface 1a, the 2a of this position reaches 550 ℃.After 5 seconds, the temperature in this position towards opticglass blank 20 inner 1mm positions reaches 549 ℃ again.The ratio that export the W number to the total of lamp well heater 28, the 29 output W number and the total of cartridge heater 22,23 this moment is adjusted into 20: 1, and proceeds mold pressing.After about 30 seconds, make mould 1, the 2 mold pressing end position that relatively moves, the outermost perimembranous that makes opticglass blank 20 arrive forming face 1a, the 2a of moulds 1,2 is diameter 27 positions.At this moment, the core temperature of opticglass blank 20 is reduced to 547 ℃, from the temperature of forming face towards inner 0.2mm position of outermost perimembranous is 555 ℃, viscosity with respect to the fully low state of the resistance of the speed of glass expansion and glass expansion under, the opticglass blank is heated to form can the mobile state.

Change refrigerating work procedure then over to.At first, begin with flow 6L/min that circulating pressure is 40N/cm in cooling channel 18,19 ²20 ℃ of pure water.Reduce the output of lamp well heater 28,29 afterwards at once with 10W/sec, stop to cartridge heater 22,23 energisings.

After beginning to cool down 10 seconds, the face top temperature of forming face 1a, the 2a of mould 1,2 is reduced to 530 ℃, and the outermost perimembranous of optical surface is reduced to 550 ℃.At this moment, the peripheral part of optical surface still can the mobile temperature, but has reached the viscosity zone of flow difficulties near the central authorities.After 30 seconds, relative moulding pressure can the mobile scope disappear in the inner whole zone of opticglass blank again, and the shape of optical glass device is determined.The outermost perimembranous surface temperature of optical surface is about 520 ℃.

According to this temperature distribution condition, be difficult to form diameter more than or equal to 25mm, outermost perimembranous thickness (コ バ is thick) lens, but by actively giving temperature distribution smaller or equal to 1mm in the past, can without any problem finish shaping.In addition, the surface accuracy of former central part causes the instability of duplicating of forming face because of contraction, and this problem also can be resolved among the present invention.

Then, make lamp well heater 28,29 and cartridge heater 22,23 be output as zero, pure water internal circulating load in the cooling channel 18,19 is increased to 10L/min, the enclosed space that contains mould 1,2 is exposed to 200 ℃ that also are not prone to the oxidation affects problem in the air atmosphere even be cooled to.Make mold 1, bed die 2 relative separation then, utilize not shown mode to take out the optical glass device of finishing shaping.

This embodiment 10 also is that temperature distribution is given a unitary example, can also further carry out other various temperature distribution controls energetically.

As mentioned above,, can implement the molding condition of irrealizable various temperature distribution in the past according to the present invention, thus the high optical glass device of shape difficulty that can be shaped and can not be shaped in the past.In addition, can increase substantially forming face precision or shape stability, make optical glass device, and can control the change of shape (for example " warpage ") that produces in the optical glass device and the shape shrinkage of the demoulding easily, in addition, needn't be shaped as the heating of in the past samming, must take the method for raising precision such as the delicate control of compacting pressure and maintenance thereof, so can shorten forming period.

Claims (16)

1. the manufacturing process of an optical glass device, configuration opticglass blank between the shaping dies that constitutes by a pair of relative mold and bed die, in the described shaping dies of heating, described opticglass blank heating is become can the mobile state, approaching relatively by making described shaping dies, carries out die forming, described shaping dies is separated with described opticglass blank, take out described opticglass blank, it is characterized in that

Be different from the temperature controlling unit that the material of thermal conductivity of the material of described shaping dies constitutes by being provided with in the formed space, inside of at least one side in described mold and described bed die by thermal conductivity, when described heating, during described cooling or during described heating and during cooling, give temperature distribution for described shaping dies.

2. the manufacturing process of optical glass device as claimed in claim 1, it is characterized in that, from described opticglass blank owing to described shaping dies begin distortion near the described mold pressing followed relatively after, the time till making described shaping dies and described opticglass blank separates after the described cooling was more than or equal to 50 seconds.

3. the manufacturing process of optical glass device as claimed in claim 1, it is characterized in that, when carrying out the described die forming of described opticglass blank, utilize gas that described shaping dies is heated with the mutually non-touching part of described opticglass blank or cool off.

4. the manufacturing process of optical glass device as claimed in claim 1 is characterized in that, gives the temperature distribution that the central part temperature is higher than peripheral part for described shaping dies, and described optical glass device is shaped.

5. the manufacturing process of optical glass device as claimed in claim 4, it is characterized in that, give the temperature distribution that described central part temperature is higher than peripheral part for described shaping dies, following optical glass device is shaped: the length of the direction parallel with making the relative approaching direction of described shaping dies of peripheral part is longer than central part.

6. the manufacturing process of optical glass device as claimed in claim 1 is characterized in that, gives the temperature distribution that the central part temperature is lower than peripheral part for described shaping dies, and described optical glass device is shaped.

7. the manufacturing process of optical glass device as claimed in claim 6, it is characterized in that, give the temperature distribution that described central part temperature is lower than peripheral part for described shaping dies, following opticglass blank is shaped: the direction parallel of peripheral part with making the relative approaching direction of described shaping dies be shorter in length than central part.

8. the manufacturing process of optical glass device as claimed in claim 1, it is characterized in that the tangent line of described shaping dies and the forming face of described opticglass blank contact and the angle maximum value that forms perpendicular to the plane that makes the relative approaching direction of described shaping dies are more than or equal to 15 degree.

9. the building mortion of an optical glass device, configuration opticglass blank between the shaping dies that constitutes by a pair of relative mold and bed die, in the described shaping dies of heating, described opticglass blank heating is become can the mobile state, recently carry out die forming by described shaping dies is connected, described shaping dies is separated with described opticglass blank, take out described opticglass blank, it is characterized in that

Be different from the temperature controlling unit that the material of thermal conductivity of the material of described shaping dies constitutes by being provided with in the formed space, inside of at least one side in described mold and described bed die, give temperature distribution for described shaping dies by thermal conductivity.

10. the building mortion of optical glass device as claimed in claim 9 is characterized in that,

Described temperature controlling unit contacts described shaping dies and is used for fixing the spindle unit of this shaping dies.

11. the building mortion of optical glass device as claimed in claim 9 is characterized in that,

Described temperature controlling unit has heating unit.

12. the building mortion of optical glass device as claimed in claim 10 is characterized in that,

The amount of heat transfer of described temperature controlling unit is greater than the amount of heat transfer of transmitting that contacts by described shaping dies and described spindle unit.

13. the building mortion of optical glass device as claimed in claim 9 is characterized in that,

Circulate by making near gas or the liquid path the described shaping dies of being located at the spindle unit that is used for fixing described shaping dies, give temperature distribution for described shaping dies.

14. the building mortion of optical glass device as claimed in claim 9 is characterized in that,

Described shaping dies is configured in that to be parts cylindraceous be telescopic inside, and has from the luminous energy heating unit of the described shaping dies of described sleeve outside heating.

15. the building mortion of optical glass device as claimed in claim 14 is characterized in that,

Described sleeve is formed with a plurality of breather holes.

16. the building mortion of optical glass device as claimed in claim 14 is characterized in that,

Described luminous energy heating unit is made of the two or more luminous energy heating units corresponding to described mold and bed die, and described sleeve has the adiabatic border corresponding to described mold and bed die.

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