CN107382036B - Hot bending forming method for laminated glass on high-speed locomotive - Google Patents
Hot bending forming method for laminated glass on high-speed locomotive Download PDFInfo
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- CN107382036B CN107382036B CN201710755468.5A CN201710755468A CN107382036B CN 107382036 B CN107382036 B CN 107382036B CN 201710755468 A CN201710755468 A CN 201710755468A CN 107382036 B CN107382036 B CN 107382036B
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- 238000013003 hot bending Methods 0.000 title claims abstract description 102
- 230000003137 locomotive effect Effects 0.000 title claims abstract description 49
- 239000005340 laminated glass Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 41
- 239000011521 glass Substances 0.000 claims abstract description 222
- 239000000758 substrate Substances 0.000 claims abstract description 175
- 238000010438 heat treatment Methods 0.000 claims abstract description 68
- 230000005855 radiation Effects 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000000843 powder Substances 0.000 claims description 27
- 239000005341 toughened glass Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 239000011863 silicon-based powder Substances 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical group O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 12
- 238000005452 bending Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000005357 flat glass Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- TVFDJXOCXUVLDH-UHFFFAOYSA-N caesium atom Chemical class [Cs] TVFDJXOCXUVLDH-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B23/00—Re-forming shaped glass
- C03B23/02—Re-forming glass sheets
- C03B23/023—Re-forming glass sheets by bending
- C03B23/025—Re-forming glass sheets by bending by gravity
- C03B23/0258—Gravity bending involving applying local or additional heating, cooling or insulating means
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C27/00—Joining pieces of glass to pieces of other inorganic material; Joining glass to glass other than by fusing
- C03C27/06—Joining glass to glass by processes other than fusing
- C03C27/10—Joining glass to glass by processes other than fusing with the aid of adhesive specially adapted for that purpose
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to the technical field of laminated glass, in particular to laminated glass on a high-speed locomotive, and specifically relates to a hot bending forming method of the laminated glass on the high-speed locomotive. The hot bending forming method comprises the following steps: placing at least two glass substrates on a hot bending forming die; placing at least one auxiliary heating cover plate on the uppermost glass substrate; heating from the upper part to enable at least two glass substrates to reach the softening temperature and be attached to a hot bending forming die; and cooling the at least two glass substrates, and then removing the at least one auxiliary heating cover plate to obtain at least two bent glass plates. The invention can hot-bend and form the laminated glass on the high-speed locomotive with the requirements of large spherical surface, double curvature and the like, can filter and buffer heat radiation, reduces direct heat impact on the topmost glass substrate, avoids the phenomenon of optical distortion of the topmost glass substrate when at least two glass substrates are simultaneously hot-bent and formed, and ensures the optical quality of the glass substrates.
Description
The technical field is as follows:
the invention relates to the technical field of laminated glass, in particular to laminated glass on a high-speed locomotive, and specifically relates to a hot bending forming method of the laminated glass on the high-speed locomotive.
Background art:
with the rapid development of the locomotive industry in China, the speed of high-speed locomotives such as motor train units independently developed in China reaches 160 km/h, 200 km/h, 250 km/h, 300 km/h and even 350 km/h and above, accordingly, the window glass, especially the windshield on the high-speed locomotive needs higher safety performance, and under the prior art condition, the mechanical strength of the glass substrate is simply strengthened, so that the requirement is far from met; meanwhile, the requirements of passengers on the appearance, visual effect, optical quality and the like of the window glass are higher and higher. According to the conventional thermal bending method for laminated glass, a plurality of glass substrates are placed on a mold for thermal bending, the heated heat is transferred from the uppermost glass substrate to the bottommost glass substrate one by one, the uppermost glass substrate is heated in a manner of thermal radiation and thermal conduction at the same time, but a second layer of downward glass substrate is only subjected to the thermal conduction of the uppermost glass substrate, a third layer of downward glass substrate is only subjected to the thermal conduction of the second layer of glass substrate, and other lower glass substrates are all subjected to the thermal conduction of the adjacent upper layer of glass substrate; in the same equipment, the glass substrate of the uppermost layer is easily softened by heating, the total thickness is thicker due to the thicker thickness of the glass substrate used by the laminated glass on the high-speed locomotive, the glass substrate of the uppermost layer is often softened in advance in order to ensure the hot bending forming of the glass substrate of the lowermost layer, and the local deformation of the glass substrate of the uppermost layer can be caused by silicon powder arranged between the glass substrates or small particle sundries which are not cleaned up, so that the optical distortion is formed, and the optical defect is caused.
In the prior art, patent CN101155762A discloses a method for bending at least one glass sheet, comprising the following steps: placing the glasses on the transport supports of a first train of carriages, said carriages running between a loading zone and a transfer zone, heating the glasses to a bending temperature and bending or pre-bending them during their transport to the transfer zone, and transferring the glasses onto the transport supports of a second train of carriages, the transport supports (T2) being different from the first transport supports, the carriages of the second train running between the transfer zone and a final cooling zone; obviously, the method is only suitable for heating and bending the automobile glass, and can not heat and bend the laminated glass on a high-speed locomotive; the invention patent CN103553306A discloses a preparation method of special high-strength toughened glass for a high-speed train, which comprises the following steps: (1) cutting and edging common flat glass, and placing the common flat glass into a corresponding mould of a hot bending forming furnace for hot bending forming; (2) mixing potassium salt, sodium salt and cesium salt to form a mixture, preheating, heating, and fully stirring to prepare the required molten salt; (3) putting the formed glass into a molten salt tank of an exchange furnace for ion exchange to finish chemical toughening; (4) heating the chemically toughened glass in a heating furnace, then placing the chemically toughened glass in a rapid cooling furnace for quenching treatment, then placing the chemically toughened glass in a secondary cooling furnace for slow cooling treatment, and finally obtaining high-strength single-piece bent glass; (5) the high-strength toughened glass special for the four-interlayer high-speed train has high strength and can effectively demist and defrost by respectively combining the single bent glass on the outer layer, the glass conductive heating film, the single bent glass on the inner layer and the anti-splashing film from outside to inside; wherein the outer layer single-piece bent glass and the inner layer single-piece bent glass are both the high-strength single-piece bent glass obtained in the step (4) and have the same shape and size; the method adopts a mode of firstly hot bending and then chemical tempering, only can manufacture a sandwich product comprising two pieces of glass, has complex steps and cannot meet the requirements of energy conservation and environmental protection.
The invention content is as follows:
the invention aims to solve the technical problem that in the prior art, when laminated glass on a high-speed locomotive is subjected to hot bending forming, optical distortion is easily formed, optical defects are caused, the process steps are complex, and the hot bending forming of three or more glass substrates is difficult to meet, and the like, and provides a hot bending forming method for the laminated glass on the high-speed locomotive.
The technical scheme adopted by the invention for solving the technical problems is as follows: a hot bending forming method of laminated glass on a high-speed locomotive, the laminated glass on the high-speed locomotive comprises at least two bent glass plates, and is characterized in that: the hot-bending forming method comprises the following steps,
step 1: preparing at least two glass substrates and placing the glass substrates on a hot bending forming die;
step 2: preparing at least one auxiliary heating cover plate and placing the auxiliary heating cover plate on the uppermost glass substrate, wherein the size of the auxiliary heating cover plate is consistent with that of the uppermost glass substrate;
and step 3: heating at least one auxiliary heating cover plate and at least two glass substrates on the hot bending forming die from the upper part to ensure that the at least two glass substrates reach the softening temperature and are attached to the hot bending forming die under the action of gravity;
and 4, step 4: and cooling the at least two glass substrates subjected to hot bending forming, and then removing the at least one auxiliary heating cover plate to obtain at least two bent glass plates.
Furthermore, in step 1, before the glass substrate is placed on the hot bending forming die, high-temperature-resistant silicon powder is sprayed between two adjacent glass substrates.
Further, the thickest one of the at least two glass substrates is in contact with the hot bend forming die.
Further, the outer contour of the glass substrate in contact with the hot bending forming die is larger than the outer contour of the hot bending forming die.
Further, the at least two glass substrates are both made of chemically tempered glass and/or the at least two glass substrates are both at least 3mm thick.
Further, the material of the auxiliary heating cover plate is selected from at least one of glass, fiber, metal and alloy.
Further, the softening temperature of the auxiliary heating cover plate is greater than or equal to the softening temperature of the glass substrate.
Further, the heat conductivity coefficient of the auxiliary heating cover plate is larger than or equal to that of the glass substrate.
Further, the auxiliary heating cover plate is softened simultaneously with or later than the uppermost glass substrate in step 3.
Further, the heating process in step 3 further comprises a heat preservation stage.
Further, the step 3 includes heating at least one auxiliary heating cover plate and at least two glass substrates on the hot bending forming die from below.
Further, at least one auxiliary heating cover plate is additionally arranged between the hot bending forming die and the lowest glass substrate.
Meanwhile, the invention also provides a hot bending forming method of laminated glass on a high-speed locomotive, wherein the laminated glass on the high-speed locomotive comprises at least two bent glass plates, and the hot bending forming method is characterized in that: the hot-bending forming method comprises the following steps,
step 1: preparing at least two glass substrates and placing the glass substrates on a hot bending forming die;
step 2: preparing high-temperature resistant white powder, and uniformly spraying the high-temperature resistant white powder on the uppermost glass substrate, wherein the melting point of the high-temperature resistant white powder is greater than that of the glass substrate;
and step 3: heating at least two glass substrates on the hot bending forming die from the upper part to ensure that the at least two glass substrates reach the softening temperature and are attached to the hot bending forming die under the action of gravity;
and 4, step 4: and cooling the at least two glass substrates subjected to hot bending forming, and then removing the high-temperature resistant white powder to obtain at least two bent glass plates.
Furthermore, in step 1, before the glass substrate is placed on the hot bending forming die, high-temperature-resistant silicon powder is sprayed between two adjacent glass substrates.
Further, the thickest one of the at least two glass substrates is in contact with the hot bend forming die.
Further, the outer contour of the glass substrate in contact with the hot bending forming die is larger than the outer contour of the hot bending forming die.
Further, the at least two glass substrates are both made of chemically tempered glass and/or the at least two glass substrates are both at least 3mm thick.
Further, the high-temperature resistant white powder is selected from at least one of silicon powder and talcum powder.
Further, the spraying thickness of the high-temperature resistant white powder in the step 2 is at least 0.5 mm.
Further, the heating process in step 3 further comprises a heat preservation stage.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the hot bending forming method of the laminated glass on the high-speed locomotive can be used for hot bending forming of the laminated glass on the high-speed locomotive with the requirements of large spherical surface, double curvature and the like, and can be used for filtering and buffering heat radiation by arranging the auxiliary heating cover plate or spraying high-temperature resistant white powder, so that direct heat impact on the topmost glass substrate is reduced, the phenomenon of light distortion of the topmost glass substrate when at least two glass substrates are subjected to hot bending forming simultaneously is avoided, and the optical quality of the glass substrates is further ensured.
Description of the drawings:
FIG. 1 is a schematic view of a hot-bending mold according to the present invention with three glass substrates placed thereon;
FIG. 2 is a schematic view of three curved glass sheets finally obtained from the hot bending mold according to the present invention.
The specific implementation mode is as follows:
the invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1 and 2, the laminated glass on a high-speed locomotive according to the present invention includes at least two curved glass plates, a thermoplastic polymer film sandwiched between the two adjacent curved glass plates, and at least one splash guard film; although three curved glass plates, i.e., the upper curved glass plate 1, the middle curved glass plate 2 and the lower curved glass plate 3, are shown in fig. 2, and the three curved glass plates in fig. 2 and the necessary number of thermoplastic polymer films and anti-spatter films are used to obtain laminated glass on a high-speed locomotive through subsequent production, it is understood that the hot roll forming method of the present invention can also be applied to laminated glass on a high-speed locomotive including two curved glass plates; the hot bending forming method of the laminated glass on the high-speed locomotive comprises the following steps:
step 1: preparing at least two glass substrates and placing them on a hot-bending mold 4;
before placing the glass substrate on the hot-roll forming mold 4, it is necessary to clean the surface of each glass substrate, and to check whether or not there are foreign matters on the glass substrate, and to confirm that the appearance of the glass substrate cannot be defective;
the hot bending forming mold 4 comprises forming rings, the forming rings are supported at the four peripheral parts of the glass substrates and have the same curvature with the bent glass plate subjected to final hot bending forming, after at least two glass substrates are placed on the hot bending forming mold 4, the at least two glass substrates are heated and softened, the at least two glass substrates are formed through self gravity, and the final four peripheral parts of the glass substrates in contact with the forming rings are attached to the forming rings to obtain the bent glass plate subjected to final hot bending forming;
after the inspection is finished, high-temperature-resistant silicon powder is sprayed between two adjacent glass substrates, and the phenomena of agglomeration, line paths and the like cannot occur in the powder spraying process; after powder spraying is finished, sequentially placing the glass substrates on a hot bending forming die 4 according to requirements, wherein the thickest glass substrate is contacted with the hot bending forming die 4; meanwhile, the stacking difference between the glass substrates must meet the requirement.
In order to prevent the mold drop phenomenon from occurring during the hot bending process, i.e. the glass substrate is smaller than the mold size and falls off the hot bending mold, the outer contour of the glass substrate contacting the hot bending mold 4 is preferably larger than the outer contour of the hot bending mold 4, specifically larger than the outer contour of the molding ring of the hot bending mold 4.
In the present invention, the high-speed locomotive generally refers to trains of 160 km/h or more, such as 200 km/h, 250 km/h, 300 km/h, 350 km/h and more.
Wherein, at least two glass substrates are chemical toughened glass, and preferably at least two glass substrates thickness all is at least 3mm when using on the high-speed locomotive, especially wherein the thickest glass substrate sets up the outside at the high-speed locomotive.
In fig. 1, three glass substrates, i.e., an upper glass substrate 11, an intermediate glass substrate 12, and a lower glass substrate 13, are placed on the hot bend forming mold 4.
Step 2: preparing at least one auxiliary heating cover plate 5 and placing them on the uppermost glass substrate, the size of the auxiliary heating cover plate 5 being identical to that of the uppermost glass substrate;
by arranging the at least one auxiliary heating cover plate 5, the phenomenon of optical distortion of the uppermost glass substrate when the at least two glass substrates are subjected to simultaneous hot bending forming can be avoided, because the at least one auxiliary heating cover plate 5 can filter and buffer the thermal radiation of the heating furnace wire 6, the direct thermal impact on the uppermost glass substrate is reduced, and the optical quality of the at least two glass substrates is ensured; preferably, the material of the auxiliary heating cover plate is selected from at least one of glass, fiber, metal and alloy; meanwhile, the softening temperature of the auxiliary heating cover plate is preferably greater than or equal to the softening temperature of the glass substrate, and the heat conductivity coefficient of the auxiliary heating cover plate is preferably greater than or equal to the heat conductivity coefficient of the glass substrate.
And step 3: heating at least one auxiliary heating cover plate 5 and at least two glass substrates on the hot bending forming mold 4 from the upper part to ensure that the at least two glass substrates reach the softening temperature and are attached to the hot bending forming mold 4 under the action of gravity;
in order to ensure that the auxiliary heating cover plate 5 does not affect the hot bending process of the glass substrate, the auxiliary heating cover plate 5 is softened simultaneously with or later than the uppermost glass substrate.
In order to prevent the glass substrate from cracking, the heating process preferably further includes a heat-preserving stage, so that the optical bright band caused by the bulging phenomenon can be prevented.
Preferably, at least one auxiliary heating cover plate 5 and at least two glass substrates on the hot-bending mold 4 can be heated from below, and when the below heating is also included, at least one auxiliary heating cover plate 5 can be additionally arranged between the hot-bending mold 4 and the lowest glass substrate.
And 4, step 4: cooling the at least two glass substrates subjected to hot bending forming, and then removing the at least one auxiliary heating cover plate 5 to obtain at least two bent glass plates;
simultaneously, in order to filter and cushion the thermal radiation to reduce the direct heat impact to a topmost glass substrate, except can setting up at least one auxiliary heating apron 5 through the aforesaid, can also directly spray the high temperature resistant white powder of certain thickness on glass substrate, specifically as follows:
the invention also provides a hot bending forming method of laminated glass on a high-speed locomotive, the laminated glass on the high-speed locomotive comprises at least two bent glass plates, and the hot bending forming method is characterized in that: the hot-bending forming method comprises the following steps,
step 1: preparing at least two glass substrates and placing the glass substrates on a hot bending forming die;
before placing the glass substrate on the hot-roll forming mold 4, it is necessary to clean the surface of each glass substrate, and to check whether or not there are foreign matters on the glass substrate, and to confirm that the appearance of the glass substrate cannot be defective;
the hot bending forming mold 4 comprises forming rings, the forming rings are supported at the four peripheral parts of the glass substrates and have the same curvature with the bent glass plate subjected to final hot bending forming, after at least two glass substrates are placed on the hot bending forming mold 4, the at least two glass substrates are heated and softened, the at least two glass substrates are formed through self gravity, and the final four peripheral parts of the glass substrates in contact with the forming rings are attached to the forming rings to obtain the bent glass plate subjected to final hot bending forming;
after the inspection is finished, high-temperature-resistant silicon powder is sprayed between two adjacent glass substrates, and the phenomena of agglomeration, line paths and the like cannot occur in the powder spraying process; after powder spraying is finished, sequentially placing the glass substrates on a hot bending forming die 4 according to requirements, wherein the thickest glass substrate is contacted with the hot bending forming die 4; meanwhile, the stacking difference between the glass substrates must meet the requirement.
In order to prevent the mold drop phenomenon from occurring during the hot bending process, i.e. the glass substrate is smaller than the mold size and falls off the hot bending mold, the outer contour of the glass substrate contacting the hot bending mold 4 is preferably larger than the outer contour of the hot bending mold 4, specifically larger than the outer contour of the molding ring of the hot bending mold 4.
In the present invention, the high-speed locomotive generally refers to trains of 160 km/h or more, such as 200 km/h, 250 km/h, 300 km/h, 350 km/h and more.
Wherein, at least two glass substrates are chemical toughened glass, and preferably at least two glass substrates thickness all is at least 3mm when using on the high-speed locomotive, especially wherein the thickest glass substrate sets up the outside at the high-speed locomotive.
In fig. 1, three glass substrates, i.e., an upper glass substrate 11, an intermediate glass substrate 12, and a lower glass substrate 13, are placed on the hot bend forming mold 4.
Step 2: preparing high-temperature resistant white powder, and uniformly spraying the high-temperature resistant white powder on the uppermost glass substrate, wherein the melting point of the high-temperature resistant white powder is greater than that of the glass substrate;
high-temperature-resistant white powder is directly and uniformly sprayed on the uppermost glass substrate to reach a certain thickness, so that the body of the glass substrate cannot be seen on the surface of the body, the heat radiation can be reflected back by virtue of white, the redundant heat radiation is prevented from being conducted to the lower surface of the glass substrate, the heating chance of the lower surface of the uppermost glass substrate is reduced, the damage of the redundant heat radiation to the glass substrate is reduced, the heat radiation of the heating furnace wire 6 can be filtered and buffered, the direct heat impact on the uppermost glass substrate is reduced, and the optical quality of at least two glass substrates is ensured; the high-temperature resistant white powder is preferably selected from at least one of silicon powder and talc powder, but is not limited thereto, and other high-temperature resistant white powder may be selected as needed. Meanwhile, in order to secure the effect of heat radiation reflection, it is preferable that the spray thickness of the high temperature resistant white powder is at least 0.5 mm.
And step 3: heating at least two glass substrates on the hot bending forming die from the upper part to ensure that the at least two glass substrates reach the softening temperature and are attached to the hot bending forming die under the action of gravity;
in order to prevent the glass substrate from cracking, the heating process preferably further includes a heat-preserving stage, so that the optical bright band caused by the bulging phenomenon can be prevented.
And 4, step 4: and cooling the at least two glass substrates subjected to hot bending forming, and then removing the high-temperature resistant white powder to obtain at least two bent glass plates.
As shown in fig. 2, three glass substrates, i.e., an upper glass substrate 11, an intermediate glass substrate 12 and a lower glass substrate 13, are formed by hot bending, and finally three curved glass plates, i.e., an upper curved glass plate 1, an intermediate curved glass plate 2 and a lower curved glass plate 3, are formed, and the three curved glass plates and a necessary number of thermoplastic polymer films and anti-spattering films are subjected to subsequent production to obtain laminated glass on a high-speed locomotive.
The above description specifically describes the hot bending method for laminated glass on a high-speed locomotive according to the present invention, but the present invention is not limited by the above description, and therefore, any improvements, equivalent modifications, substitutions, etc. made according to the technical gist of the present invention are within the scope of the present invention.
Claims (11)
1. A hot bending forming method of laminated glass on a high-speed locomotive, the laminated glass on the high-speed locomotive comprises at least two bent glass plates, the high-speed locomotive is a high-speed train with the speed of more than 200 kilometers per hour, and is characterized in that: the hot-bending forming method comprises the following steps,
step 1: preparing at least two glass substrates, wherein the at least two glass substrates are all made of chemically tempered glass and have the thickness of at least 3mm, and placing the chemically tempered glass and the glass substrates on a hot bending forming die;
step 2: preparing at least one auxiliary heating cover plate and placing the auxiliary heating cover plate on the uppermost glass substrate, wherein the size of the auxiliary heating cover plate is consistent with that of the uppermost glass substrate; the auxiliary heating cover plate is made of at least one material selected from glass, fibers, metals and alloys, the softening temperature of the auxiliary heating cover plate is higher than that of the glass substrate, and the thermal conductivity of the auxiliary heating cover plate is higher than that of the glass substrate;
and step 3: heating at least one auxiliary heating cover plate and at least two glass substrates on the hot bending forming die from the upper part to enable the at least two glass substrates to reach softening temperature and be attached to the hot bending forming die under the action of gravity, wherein the auxiliary heating cover plate can filter and buffer heat radiation of a heating furnace wire, and the auxiliary heating cover plate is softened later than the uppermost glass substrate;
and 4, step 4: and cooling the at least two glass substrates subjected to hot bending forming, and then removing the at least one auxiliary heating cover plate to obtain at least two bent glass plates.
2. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 1, wherein: in the step 1, before the glass substrates are placed on a hot bending forming die, high-temperature-resistant silicon powder is sprayed between two adjacent glass substrates.
3. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 1, wherein: the thickest glass substrate of the at least two glass substrates is contacted with the hot bending forming die.
4. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 1, wherein: the outer contour of the glass substrate in contact with the hot bending forming die is larger than that of the hot bending forming die.
5. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 1, wherein: the heating process in the step 3 also comprises a heat preservation stage.
6. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 1, wherein: and step 3, heating at least one auxiliary heating cover plate and at least two glass substrates on the hot bending forming die from the lower part.
7. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 6, wherein: at least one auxiliary heating cover plate is additionally arranged between the hot bending forming die and the lowest glass substrate.
8. A hot bending forming method of laminated glass on a high-speed locomotive, the laminated glass on the high-speed locomotive comprises at least two bent glass plates, the high-speed locomotive is a high-speed train with the speed of more than 200 kilometers per hour, and is characterized in that: the hot-bending forming method comprises the following steps,
step 1: preparing at least two glass substrates, wherein the at least two glass substrates are made of chemically tempered glass and have a thickness of at least 3mm, placing the glass substrates on a hot bending forming die, and spraying high-temperature-resistant silicon powder between every two adjacent glass substrates before the glass substrates are placed on the hot bending forming die;
step 2: preparing high-temperature-resistant white powder, and uniformly spraying the high-temperature-resistant white powder onto the uppermost glass substrate, wherein the spraying thickness of the high-temperature-resistant white powder is at least 0.5mm, the melting point of the high-temperature-resistant white powder is greater than that of the glass substrate, and the high-temperature-resistant white powder is talcum powder;
and step 3: heating at least two glass substrates on the hot bending forming die from the upper part, so that the at least two glass substrates reach the softening temperature and are attached to the hot bending forming die under the action of gravity, and the high-temperature resistant white powder can filter and buffer the heat radiation of the heating furnace wire;
and 4, step 4: and cooling the at least two glass substrates subjected to hot bending forming, and then removing the high-temperature resistant white powder to obtain at least two bent glass plates.
9. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 8, wherein: the thickest glass substrate of the at least two glass substrates is contacted with the hot bending forming die.
10. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 8, wherein: the outer contour of the glass substrate in contact with the hot bending forming die is larger than that of the hot bending forming die.
11. The method for hot roll forming of laminated glass for high-speed locomotives according to claim 8, wherein: the heating process in the step 3 also comprises a heat preservation stage.
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| KR102159120B1 (en) * | 2019-02-22 | 2020-09-23 | 코세스지티 주식회사 | Curved glass forming mold and curved glass forming method using the same |
| CN112125503A (en) * | 2020-09-02 | 2020-12-25 | 四川旭虹光电科技有限公司 | Method for hot bending and forming curved glass |
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| CN101475300A (en) * | 2008-11-20 | 2009-07-08 | 广州兴华玻璃工业有限公司 | Hot bending process for big step glass |
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| US7231787B2 (en) * | 2002-03-20 | 2007-06-19 | Guardian Industries Corp. | Apparatus and method for bending and/or tempering glass |
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| CN101475300A (en) * | 2008-11-20 | 2009-07-08 | 广州兴华玻璃工业有限公司 | Hot bending process for big step glass |
| CN103524024A (en) * | 2012-09-29 | 2014-01-22 | 洛阳市凌空安全玻璃有限公司 | Heating method of automotive glass in thermal bending |
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