The forming method of 3D bend glass plate and the 3D song obtained by the forming methodSurface glass plateTechnical field
The present invention relates to the forming method of 3D bend glass plate and the 3D bend glasses obtained by the forming methodPlate.More particularly it relates to can be the 3D song for being applicable to electronic display unit by specific formed from plate glassThe forming method of surface glass plate and by the forming method obtain be suitable for electronic display unit, be particularly suitable for be used as electricityThe sub- display device screen protection 3D bend glass plate of glass.
Background technique
In recent years, non-planar and with curved surface digital product glass cover-plate exploitation obtain it is prevailing, on the market after 2DAfter glass, there is the appearance of 2.5D, 3D bend glass panel products in succession.
So far, 2D glass, 2.5D glass and 3D glass are roughly divided into for the glass cover-plate of digital product, whereinThe pure flat surface glass of 2D glass, that is, common, without any cambered design；2.5D glass is then that centre is plane but edge uses arcThe glass cover-plate of shape design；And 3D glass, it is no matter in centre or at edge to be all made of the glass cover-plate of cambered design.And makeFor using 3D bend glass plate advantage, in addition to frivolous, transparent cleaning, anti-fingerprint, anti-hyun light, hard, scratch resistant, weatherability are goodIn addition, in particular, when being used for digital product display screen, since the cambered surface edge of curve screens is higher than center, so that entirelyScreen seems full, no matter is significantly better than that 2D and 2.5D product in product face value or in visual effect；Also, 3D curved surfaceGlass plate and center 180 degree smooth connection, more meet base of principle of human engineering, so that the feel body of sliding screen greatly improvedIt tests；Furthermore it can also facilitate and solve the problems, such as the deficiency of the antenna arrangement space such as mobile phone, so as to bring enhancing receptionThe additional performance gain such as function.
On the other hand, as flexible OLED is to the substitution of LCD, flexible display screen accounting area is significantly increased, this is also required toCover plate materials cooperation is made into 3D shape, and since metal shell has electromagnetic shielding, it will affect the signal of communication of such as 4G cell phone,Therefore it needs metal shell isolation multistage just can guarantee communication quality.And as the 5G epoch arrive, signal of communication is increasingly complex,And NFC, wifi and wireless charging technology all will be the standard configuration of the following mobile phone, metal shell will be further for the shielding of signalIt highlights, non-metallic material welcomes major opportunity.Glass material is quality-high and inexpensive, comfortable feel, easy to process, is excellent substitution materialMaterial, it may be said that 3D bend glass is quality material that so far uniquely can preferably with curve screens fitting.In addition, beingSymmetrical aesthetic feeling is obtained with cover board 3D glass, back-panel glass also tends to curved surface 3Dization, market scale further expansion.
Currently, the development of 3D bend glass is very swift and violent, wide market.And the molding side as 3D bend glassMethod, adopted at present includes mechanical numerically-controlled machine tool processing, hot bending shape, chemical solution etching molding etc..Wherein, mechanical numberControl machine tooling method difficulty of processing is big and shape is limited, polishing cost is high, chemical solution etches the at high cost of forming methodIt is high, environmental pollution is big, shape is also limited, therefore, the processing method that mainstream uses in the industry at present is that freedom of design in configuration is high, baseThe hot bending shape method that this is pollution-free and small polished amount.Hot bending shape method is heated and softened simultaneously to such as flat glassAfter forming in a mold, the method for bend glass is made by annealing.
But hot bending shape method so far is in the prevalence of oxygen high and leading to molding die due to forming temperatureChange is fast, cannot achieve the recycling of material/mold, the problem that forming cost remains high in turn.The presence of these problems hindersIndustrial large-scale production/molding development of 3D bend glass plate is hindered.
As described above, currently, 3D bend glass plate molding/manufacturing field, it would be highly desirable to find one kind and be able to suppress moldingThe oxidation of mold, the forming method for realizing the recycling of material/mold, energy saving and cost 3D bend glass plate.
Summary of the invention
Problems to be solved by the invention
The present invention the problem of presence in the prior art as described above in view of completing, and it is an object of the present invention to provide a kind of energyEnough inhibit the oxidation of molding die, realize the recycling of material/mold, energy saving and cost specific 3D bend glassThe forming method of plate.
Further, the object of the invention is also to provide the electronical displays that is applicable to obtained by above-mentioned forming method to setIt is standby, be particularly suitable for the 3D bend glass plate as electronic display device screen protection glass.Solution to the problem
The present inventor has made intensive studies in order to achieve the above objectives, as a result, it has been found that, it is as described below by takingEach process divide equally multistage and design each section temperature and pressure and carry out the forming method of molding 3D bend glass plate, canBy specific formed from plate glass be 3D bend glass plate in the case where avoiding the oxidation of molding die, and energy saving andGuarantee the quality of 3D bend glass plate obtained in the case where cost, the 3D bend glass plate so as to manufacture is suitable for spyIt is not electronic display unit, is particularly suitable for the 3D bend glass plate as electronic display device screen protection glass.
Specifically, the present invention provides a kind of forming method of 3D bend glass plate, include at least: by raw material glass plateIt is put into molding die and loads the loading process of molding die；Via molding die to glass plate progress pre-heating temperature elevation and in advanceThe preheating procedure of pressure；Raw material glass plate is heated to being compressed into having and the molding after its hot bending shape temperature or moreThe hot bending shape process of the bend glass plate of the corresponding 3D curve form of mold；To obtained in the hot bending shape processThe annealing operation that the bend glass plate is annealed；The cold of cooling and shaping is carried out to the bend glass plate that have passed through the annealingBut process；And it unloads mold and exports 3D bend glass plate unloading process.
It should be noted that the forming method is preferred for for following alumina silicate glasses being shaped to 3D bend glass plate,The alumina silicate glass includes following component by percentage to the quality:
SiO2: 56-62%
Al2O3: 12-19%
Na2O:11-16%
K2O:2-6%
MgO:3-8%
ZrO2: 0-1.5%
B2O3: 0-2%
ZnO:0-3%
Li2O:0-3%.
In turn, in the alumina silicate glass,
The total amount of the MgO and ZnO is preferably 4~7%,
The SiO2、Al2O3、ZrO2Total amount be preferably greater than 72%,
The Na2O、K2O、Li2The total amount of O is preferably 14~20%,
Additionally, it is preferred that in the alumina silicate glass, alkali metal oxide and alkaline earth oxide, i.e. R2O/MO (itsIn, R indicate alkali metal, M indicate alkaline-earth metal) ratio be greater than 2.6.Wherein, in above-mentioned alumina silicate glass of the invention,The alkali metal oxide includes Li2O、Na2O and K2O, the alkaline earth oxide include MgO and ZnO.
In the forming method of 3D bend glass plate of the invention, in the loading process, by artificial or mechanicalMode the raw material glass plate is put into the molding die, and the molding die and the raw material glass plate are conveyedTo preheating zone.
In addition, the material of the molding die is preferably graphite or ceramics, more preferably graphite.
In the forming method of 3D bend glass plate of the invention, in the preheating procedure, it is preferred to use multistage heating,And by every section of temperature be higher than the last period temperature in a manner of gradient increased temperature to the raw material glass plate hot bending shape temperature.Wherein,The multistage heating is more preferably 6 sections of heating, and preheating temperature ranges preferably from 400~730 DEG C, and further preferably described 6 sections addEach section of temperature range of heat is respectively as follows: paragraph 1 and preheats 400~550 DEG C, the 2nd section of 500~600 DEG C of preheating, the 3rd section of preheating 550~650 DEG C, the 4th section preheat 600~700 DEG C, the 5th section and preheat 640~720 DEG C, the 6th section of 680~730 DEG C of preheating.
In addition, the pressure limit of the precompressed is preferably 0.01~0.50MPa in the preheating procedure.
In the forming method of 3D bend glass plate of the invention, in the hot bending shape process, hot bending shape processIt is preferred that using 3~8 sections of hot briquettings, 3 sections of hot briquettings are more preferably used, in addition, the hot bending shape temperature range is preferably660~780 DEG C.Wherein, each section of temperature range of further preferably 3 sections of hot briquettings is respectively as follows: paragraph 1 hot bending shape660~715 DEG C, the 2nd section of 680~730 DEG C of hot bending shape, the 3rd section 700~780 DEG C of hot bending shape.
In addition, in the hot bending shape process, preferably by pressurizing device to mold be fixed pressure pressurization or byStep segmentation pressurization, pressure limit is preferably 0.01~1.2MPa, using 3 sections of hot briquettings and using gradually segmentation pressurizationIn the case of, more preferably each section of pressure limit are as follows: 0.01~0.50MPa of paragraph 1 hot bending shape, the 2nd section of hot bending shape 0.05~0.75MPa, the 3rd section of 0.15~1.20MPa of hot bending shape.
In the forming method of 3D bend glass plate of the invention, in the annealing operation, annealing process preferably uses 2~6 sections of annealing, more preferably using 4 sections of annealing, in addition, the annealing region is preferably 500 DEG C~750 DEG C.Wherein, into oneEach section of temperature range of the preferably described 4 sections of annealing of step is respectively as follows: 680~750 DEG C, the 2nd section annealing 620~700 of paragraph 1 annealingDEG C, the 3rd section anneal 550~650 DEG C, the 4th section anneal 500~600 DEG C.
In addition, electric-heating-wire-heating Xu Leng cooling method is preferably taken in the annealing operation,
In addition, pressurizeing preferably by pressurizing device to mold, pressure limit is preferably in the annealing operation0.1~1.0MPa.
In the forming method of 3D bend glass plate of the invention, in the cooling process, cooling procedure preferably uses 2~12 sections of coolings more preferably use 5 sections of coolings, in addition, the cooling temperature range is preferably 40 DEG C~550 DEG C.Wherein, into oneIt walks preferably described 5 sections each section cooling of temperature ranges and is respectively as follows: paragraph 1 cooling 450~550 DEG C, the 2nd section of cooling 350~450DEG C, the 3rd section of 250~350 DEG C of cooling, the 4th section of 150~250 DEG C of cooling, the 5th section of 40~150 DEG C of cooling.
In addition, in the cooling process, preferably taking the circulating cooling water jacket type of cooling.
In addition, in the cooling process, pressurizeing preferably by pressurizing device to mold, pressure limit is preferably0.1~1.0MPa.
In the forming method of 3D bend glass plate of the invention, when the forming method is used for continuous production, sectionClapping the time is preferably 30~150 seconds, more preferably 35~120 seconds, more preferably 45~90 seconds, further preferably 55~80Second is most preferably 75 seconds.
Further, the present invention provides a kind of 3D bend glass plate, is the molding side by above-mentioned 3D bend glass plateThe alumina silicate glass that method forms, the alumina silicate glass include following component by percentage to the quality:
SiO2: 56-62%
Al2O3: 12-19%
Na2O:11-16%
K2O:2-6%
MgO:3-8%
ZrO2: 0-1.5%
B2O3: 0-2%
ZnO:0-3%
Li2O:0-3%.
In addition, the 3D bend glass plate thickness is preferably 0.3~1.1mm.
In 3D bend glass plate of the invention, the total amount of the MgO and ZnO are preferably 4~7%, the SiO2、Al2O3、ZrO2Total amount be preferably greater than 72%, the Na2O、K2O、Li2The total amount of O is preferably 14~20%.
Additionally, it is preferred that alkali metal oxide and alkaline earth oxide, i.e. R in the 3D bend glass plate2O/MO (wherein, RIndicate alkali metal, M indicate alkaline-earth metal) ratio be greater than 2.6.Wherein, described in above-mentioned 3D bend glass plate of the inventionAlkali metal oxide includes Li2O、Na2O and K2O, the alkaline earth oxide include MgO and ZnO.
Further, 3D bend glass plate as described above of the invention is preferred for electronic display unit, is more preferably used asGlass is used in electronic display device screen protection.
The effect of invention
The forming method of 3D bend glass plate as described above according to the present invention is being manufactured/is being formed by flat glass plateWhen specific 3D bend glass plate, it is able to suppress the oxidation of molding die, realizes the recycling of material/mold, it is energy savingAnd cost.Further, the 3D bend glass plate as obtained from above-mentioned forming method is applicable to electronic display unit, especially may be usedIt is suitable for use as electronic display device screen protection glass.
Detailed description of the invention
[Fig. 1] is flow chart, shows the tool of the forming method for the 3D bend glass plate that embodiments of the present invention are related toBody process.
The illustrative shape for the 3D bend glass plate that [Fig. 2] is formed using forming method of the present invention is illustratedFigure, wherein Fig. 2 (a) is perspective view, is respectively front view (left side) and side view (right side) in Fig. 2 (b).
It detects the bending section for the 3D bend glass plate that [Fig. 3] is obtained using the forming method of 3D bend glass plate of the inventionAs a result schematic diagram.
Specific embodiment
Hereinafter, the forming method for the 3D bend glass plate that embodiments of the present invention are related to is specifically described.
As shown in Figure 1, the forming method of 3D bend glass plate of the invention is in addition to the preparation raw material glass plate before beginningOther than process, includes at least following processes: raw material glass plate is put into the loading work in molding die and loading molding dieSequence；The preheating procedure of pre-heating temperature elevation and precompressed is carried out to glass plate via molding die；Raw material glass plate is heated to its hot bendingThe bend glass plate with 3D curve form corresponding with the molding die is compressed into after more than forming temperatureHot bending shape process；The annealing operation annealed to the bend glass plate obtained in the hot bending shape process；It is rightThe bend glass plate that have passed through the annealing carries out the cooling process of cooling and shaping；And it unloads mold and exports 3D curved surface glassThe unloading process of glass plate.
It should be noted that in order to avoid mold is oxidized and influence its service life and protect 3D glass surface matterAmount preferably carries out nitrogen charging processing to entire process flow.
Hereinafter, being described in detail for each process.
(preparing raw material glass plate)
The raw material glass plate for manufacturing 3D bend glass plate in the present invention can specifically prepare as described below: underThe component ratio stated cooperates each raw material, and each raw material is added in electric smelter after mixing through batch mixer and is melted, by melten glassLiquid is cast in metal die, and glass is put into togerther in annealing furnace together with metal die to carry out fine annealing cooling, then intoRow cuts and raw material glass plate is made.The generally planar glass plate of raw material glass plate.The thickness of the raw material glass plate canIt is suitably selected, preferably 0.3~1.1mm according to the thickness for the 3D bend glass plate to be made.
The proportion by percentage to the quality of each raw material component is as described below.
SiO2: 56-62%
Al2O3: 12-19%
Na2O:11-16%
K2O:2-6%
MgO:3-8%
ZrO2: 0-1.5%
B2O3: 0-2%
ZnO:0-3%
Li2O:0-3%.
Further, said ratio preferably further meets one or more conditions in following conditions:
The total amount of the MgO and ZnO is 4~7%,
The SiO2、Al2O3、ZrO2Total amount be greater than 72%,
The Na2O、K2O、Li2The total amount of O is 14~20%.
Additionally, it is preferred that alkali metal oxide and alkaline earth oxide, i.e. R in said ratio2(wherein, R is indicated O/MOAlkali metal, M indicate alkaline-earth metal) ratio be greater than 2.6.It should be noted that being used to prepare base glass as described aboveIn each component of plate, the alkali metal oxide includes Li2O、Na2O and K2O, the alkaline earth oxide include MgO andZnO。
Preparation method and the raw material glass plate of proportion production usually have characteristic as described below as described above:
1. strain point: 550 DEG C ± 20 DEG C.
2. annealing point: 605 DEG C ± 20 DEG C.
3. deformation point: 685 DEG C ± 20 DEG C.
4. softening temperature: 830 DEG C ± 20 DEG C.
5. thermal expansion coefficient: 98.0 ± 2 × 10-7/℃。
(loading process)
Loading process is the process for loading molding die and raw material glass plate.Specifically, raw material glass plate is passed through peopleWork or the mode of machinery are put into molding die, are delivered to preheating zone after positioning is fixed, specifically by raw material glass plate together withMold passes through hot bending equipment entrance together and is delivered to hot bending equipment pre-heating temperature elevation area.The material of molding die preferably use ceramics orGraphite material more preferably uses graphite material.The size of molding die is according to glass sample characteristic and the 3D curved surface to be obtainedShape of glass plate etc. and determine, in addition, 2 section dies or upper, middle and lower 3 section die up and down can be used in molding die.
(preheating procedure)
In preheating procedure, pre-heating temperature elevation and precompressed are carried out to glass plate via molding die.Preheating procedure preferably usesPiecewise uniform preheating, and by every section of temperature be higher than the last period temperature in a manner of gradient increased temperature to the glass hot bending shape temperature.In general, each section of pre-heating temperature elevation gradient is formulated in advance, to make mold can be according to preset liter after entering this section of regionWarm gradient heats up.It should be noted that pre- by making raw material glass plate in warm-up phase carry out piecewise uniform with dividing multistageHeat, the defects of glass can be effectively prevent to generate warpage, surface deformation in temperature-rise period.In addition, by preheating, so that glassThe temperature of plate reaches it up to deformation point temperature.
In addition, the heating gradient as each warm-up phase, the deformation point temperature characterisitic of glass according to the present invention and selectedThe segmented model selected and integrate and determine.It is preheated in the present invention, it is preferred to divide 6 sections, preheating temperature ranges preferably from 400~730 DEG C, specifically, more preferably each section of temperature range difference is as follows: paragraph 1 preheating using 6 sections of preheatings400~550 DEG C, the 2nd section preheat 500~600 DEG C, the 3rd section and preheat 550~650 DEG C, the 4th section of 600~700 DEG C, the 5th section of preheating640~720 DEG C of preheating, the 6th section of 680~730 DEG C of preheating.
In addition, the pressure limit of precompressed is preferably 0.01~0.50MPa in preheating procedure.
(hot bending shape process)
In hot bending shape process, after raw material glass plate to be heated to its hot bending shape temperature or more, by using pointDuan Jiare pressurization periodically applies certain pressure and certain temperature to die surface by hot bending equipment, to make glass plate mostEnd form at expectation 3D bend glass form.
It should be noted that the hot bending shape temperature of glass is usually between the strain point of the glass and softening point.At thisIn invention, hot bending shape temperature range is preferably 660~830 DEG C.Further, it is contemplated that forming temperature is excessively high to will lead to glass plateThere is the defects of deformation, pitted skin, cellular site in surface, and more preferable hot bending shape temperature is 660~780 DEG C.
In addition, being taken as each section of temperature when segmentally heating pressurization, pressure setting, the deformation of glass according to the present inventionIt puts temperature characterisitic and selected segmented model and integrates and determine, and the pressure size of hot bending equipment, pushing speed, pushingHeight etc., by combining glass performance and site technique situation to determine.
Hot bending shape process preferably uses 3~8 sections of hot briquettings, more preferably uses 3 sections of hot briquettings.
In addition, pressure pressurization is fixed to mold preferably by pressurizing device or gradually divides in hot bending shape processSection pressurization, pressure limit is preferably 0.01~1.2MPa.In addition, gradually dividing in hot bending shape process using in the periodWhen section pressuring method, applies certain pressure in per pressing period specifically, can take, reach setting pressure after a certain timeAnd the mode for being kept for setting pressure to pressing time terminate.
Specifically, further preferred each section of temperature, pressure setting are as follows using 3 sections of hot bending shapesIt is described: 660~715 DEG C of paragraph 1 hot bending shape temperature, 0.01~0.50MPa of pressure；2nd section of hot bending shape temperature 680~730DEG C, 0.05~0.75MPa of pressure；3rd section of 700~780 DEG C of hot bending shape temperature, 0.15~1.20MPa of pressure.
(annealing operation)
In annealing operation, in order to eliminate stress caused by hot-working, in above-mentioned hot bending shape process in moldBy 3D bend glass plate obtained from hot bending shape, anneal more than strain point temperature.Wherein, in order in proof stress3D curved-surface shape is kept while obtaining effectively eliminating, and electric-heating-wire-heating Xu Leng cooling method is preferably taken to anneal, in addition,It is preferred that divide 2~6 sections to anneal, more preferably point 4 sections of annealing.The annealing point temperature and strain point temperature of glass according to the present inventionDegree, annealing region is preferably 500~750 DEG C.
Further, glass performance and annealing way according to the present invention can also carry out temperature appropriate to upper and lower mould temperatureDifference control, it is possible thereby to more efficiently adjust the angularity of glass plate.
In addition, pressurize preferably by pressurizing device to mold in annealing operation, pressure limit is preferably 0.1~1.0MPa。
Further, in the case where taking 4 sections of annealing, each section of temperature range is respectively as follows: paragraph 1 annealing 680~750DEG C, the 2nd section anneal 620~700 DEG C, the 3rd section anneal 550~650 DEG C, the 4th section anneal 500~600 DEG C.
(cooling process)
3D bend glass plate uniform decrease in temperature in order to guarantee is completed to move back in mold to mold clearing temperature in the glass plateAfter firer's sequence, cooling process gradually cooling below strain point temperature is carried out.In cooling process, preferably take circulation coldBut the water jacket type of cooling is cooled down.Wherein, circulating cooling coolant-temperature gage is preferably 10~30 DEG C.Additionally, it is preferred that points 2~12 sections intoRow cooling, more preferably divides 5 sections and is cooled down.The annealing point temperature and strain point temperature of glass according to the present invention, cooling temperatureRange preferably from 40~550 DEG C.
In addition, in cooling process, pressurize preferably by pressurizing device to mold, pressure limit is preferably 0.1~1.0MPa。
Further take 5 sections it is cooling in the case where, each section of temperature range be respectively as follows: paragraph 1 it is 450~550 DEG C cooling,2nd section of 350~450 DEG C of cooling, the 3rd section of 250~350 DEG C of cooling, the 4th section of 150~250 DEG C of cooling, the 5th section of cooling 40~150℃。
(unloading process)
Unloading process in the forming method of 3D bend glass plate of the invention is in the cooling for completing 3D bend glass plateAfter process, molding die is unloaded, open mold and takes out the process of 3D bend glass plate.It should be noted that in order to realizeThe recycling of molding die usually cleans mold after the unloading process.
In this way, by including 3D curved surface obtained from the forming method of the 3D bend glass plate of each process as described aboveGlass plate, bending section bending shape and yields are better than existing level, especially hot bending yields, significantly larger than current volume production waterIt is flat.It should be noted that the judgment basis as hot bending non-defective unit, it can be by 1. three-coordinates measuring machine being used to measure product profileDegree, flatness, outer dimension and digital-to-analogue are compared；2. appearance detects (broken, unfilled corner, crackle, point defect) and is determined.
In addition, in order to realize for example industrial continuous production, by the forming method of 3D bend glass plate of the inventionWhen for continuous production, pitch time is preferably 30~150 seconds, more preferably 35~120 seconds, more preferably 45~90 seconds,Further preferably 55~80 seconds, most preferably 75 seconds.It should be noted that the continuous production here, is at first pieceThe production process of the second block forming die is put into after molding die is sent into transition region, driving means resets, and so on, thusReach the requirement that circulation is worked continuously.And the pitch time in continuous production, the interval time of output products is referred to, in this hairIn bright, the sum of the transmission time of hot bending pressing time and product between two stations is also equal to (that is, when pitch time=hot bending pressurizationBetween+transmission time of the product between two stations).
Embodiment
Hereinafter, further description of the technical solution of the present invention in conjunction with the embodiments, but the present invention is not limited to thisA little embodiments.It should be noted that all, modifying or equivalently replacing the technical solution of the present invention, without departing from the present inventionThe technical solution of the spirit and scope of technical solution should all cover within the protection scope of the present invention.
(1) preparation of raw material glass plate
Raw material is cooperated according to following proportions, and using batch mixer be uniformly mixed after, be added electric smelter in melt,Melten glass liquid is cast in metal die, by glass together with metal die be put into togerther in annealing furnace carry out fine annealing it is coldBut, it is finally cut and is made having a size of vertical 150mm × horizontal 80mm × thickness 0.40mm raw material glass plate.
The proportion by percentage to the quality of each raw material is as described below.
SiO2: 60.7%
Al2O3: 12.8%
Na2O:13.2%
K2O:5.4%
MgO:6.5%
ZrO2: 0.6%
B2O3: 0.2%
ZnO:0.1%
Li2O:0.5%
Na2O+K2O+Li2O:19.1%
MgO+ZnO:6.6%
SiO2+Al2O3+ZrO2: 74.1%
R2O/MO=2.9 (wherein, R indicates that alkali metal, M indicate alkaline-earth metal).
(2) molding of 3D bend glass plate
The raw material glass plate prepared as described above is put into molding die (2 segment type molding dies of graphite material),And after loading the molding die, successively carried out as before according to the segmentation of mold temperature and heating or cooling in following table 1~table 5Preheating procedure, hot bending shape process, annealing operation, cooling process and the unloading process.
In preheating procedure, each section of temperature setting is as described in Table 1.It should be noted that in reality of the inventionIt applies in example, takes 6 sections of preheatings.
[table 1]
Wherein, 1~6 section of preheating pressure is 0.1MPa.It has just been connect in addition, adjusting heating plate depressed position to heating plateTouch mould upper surface.
Further, in hot bending shape process, as described in Table 2, each section of pressure is set for each section of temperature settingAs described in Table 3.It should be noted that in an embodiment of the present invention, taking 3 sections of hot bending shapes.
[table 2]
[table 3]
It should be noted that in hot bending shape process each section be all made of in the period gradually pressuring method, heating plate is pushedPosition is adjusted to 1~2mm below mould upper surface elevation location.
It should be noted that is taken is per pressing period to apply certain pressure, certain in each section of pressure settingThe mode for reaching setting pressure after time and being kept for setting pressure to pressing time terminate.If to hot bending shape by taking hot bending 3 as an exampleBe segmented pattern of pressure explanation, can be proceed as follows: the every 0.25s of first segment applies 0.001MPa pressure, and pressure reaches after 20sTo 0.08MPa, second segment continues to pressurize on the basis of 0.08MPa, and every 0.30s applies 0.001MPa pressure, the pressure after 36sReach 0.20MPa, terminate pressurization after persistently keeping 0.20MPa pressure 14s, carries out mold transport to next station.
Further, in annealing operation, each section of temperature setting is as described in Table 4.It should be noted that in this hairIn bright embodiment, 4 sections of annealing are taken.
[table 4]
It should be noted that the pressure of 4 sections of annealing is disposed as 0.15MPa, heating plate depressed position is adjusted to mold1~2mm below the elevation location of upper surface.
Further, in cooling process, each section of temperature setting is as described in Table 5.It should be noted that in this hairIn bright embodiment, 5 sections of coolings are taken.
[table 5]
It should be noted that being all made of in 5 sections of cooling, 16 DEG C of circulating waters are cooling, and pressure is disposed as 0.10MPa,Coldplate depressed position is adjusted to 1~2mm below mould upper surface elevation location.
It is further to note that the 3D bend glass plate in the present embodiment is the unilateral bending of narrow side, it to be used for continuous productionWhen pitch time be 75s, wherein pressing time 70s, transmission time of the product between two stations be 5s.
(3) output of 3D bend glass plate
By above-mentioned molding die after exporting in hot bending equipment, temperature is reduced to 40 DEG C or so, after opening mold, using trueFormed glass is sucked in suction pen, then carries out the techniques such as subsequent polishing, tempering.
(4) quality of 3D bend glass plate
The hot bending of the 3D bend glass plate obtained as described above using the forming method of 3D bend glass plate of the inventionYields > 90%.It should be noted that the judgment basis as hot bending non-defective unit, it can be by 1. being surveyed using three-coordinates measuring machineAmount product profile tolerance, flatness, outer dimension and digital-to-analogue are compared；2. appearance detection (broken, unfilled corner, crackle, point defect)And determined.
In addition, bending section bending shape and yields are better than existing level.Wherein, bending section testing result is as shown in Figure 3.It canSee, it is horizontal that hot bending yields is significantly larger than current volume production.