CN110963678A - Rapid-heating curved glass hot bending device and method - Google Patents
Rapid-heating curved glass hot bending device and method Download PDFInfo
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- 239000011521 glass Substances 0.000 title claims abstract description 106
- 238000010438 heat treatment Methods 0.000 title claims abstract description 84
- 238000013003 hot bending Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 30
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 57
- 239000010439 graphite Substances 0.000 claims abstract description 57
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052802 copper Inorganic materials 0.000 claims abstract description 37
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- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 24
- 230000007246 mechanism Effects 0.000 description 5
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000005485 electric heating Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 230000005484 gravity 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
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0307—Press-bending involving applying local or additional heating, cooling or insulating means
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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
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0302—Re-forming glass sheets by bending by press-bending between shaping moulds between opposing full-face shaping moulds
-
- 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
- C03B23/03—Re-forming glass sheets by bending by press-bending between shaping moulds
- C03B23/0305—Press-bending accelerated by applying mechanical forces, e.g. inertia, weights or local forces
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Abstract
The invention discloses a device and a method for hot bending of curved glass capable of being rapidly heated. The device comprises a high-frequency heater, an inner furnace, an outer furnace and a graphite mold; the high-frequency heater can generate and output high-frequency heating current or intermediate-frequency heating current; the inner furnace is externally connected with a vacuum pump; an annular copper pipe which is circularly wound into turns is arranged in the furnace body of the inner furnace; two ends of the annular copper pipe are respectively connected with a water outlet pipe and a water inlet pipe of the high-frequency heater; the graphite mould is used for containing plane glass and is sent into a furnace body of the inner furnace for hot bending forming; the inner furnace is arranged in the outer furnace and is wrapped by the outer furnace; and a heat insulation plate is arranged between the inner furnace and the outer furnace. The device can be used for hot bending forming of curved glass, and the curved glass hot bending method based on the device is high in heating speed, high in production efficiency, low in production cost, high in yield, good in equipment stability and low in failure rate, so that the production requirement of the future market on the curved glass can be effectively met.
Description
Technical Field
The invention relates to the technical field of curved glass hot bending, in particular to a device and a method for quickly heating curved glass hot bending.
Background
In recent years, with the coming of 5G communication signals, the use of flexible OLED screens is becoming widespread, and the processing and production of 3D curved glass becomes an important industrial chain for manufacturing mobile phone screens.
In the processing production of the 3D curved glass, the 3D curved glass is a big difficulty, the 3D curved glass is mainly limited by equipment productivity, yield, moulds, process control and the like, and the 3D curved glass development speed is limited due to the difficulty of the 3D curved glass in hot bending.
In the traditional 3D curved glass hot bending forming equipment, the heating devices of the equipment heat the graphite mould by means of electric heating tubes, infrared lamp tubes or local high-frequency radiation, so that the hot bending forming of the curved glass is achieved, and the design and the manufacture of the heating devices are key points influencing the production efficiency of the equipment. The electric heating tube has the advantages of low heating speed, complex structure, high failure rate and poor stability; although the heating speed of the infrared lamp tube is high, the temperature is difficult to control, and the radiation temperature is easy to lose, so that the temperature stability is poor; the local high-frequency radiation heating mode needs to consume a large amount of nitrogen to protect the graphite mold, consumes larger electric quantity and has higher cost.
Therefore, from the consideration of production process and cost, the current heating mode greatly influences the production efficiency of the 3D curved surface glass hot bending machine, and the requirements of the future market cannot be effectively met.
Disclosure of Invention
The invention aims to provide a curved glass hot bending device capable of heating quickly aiming at the defects in the prior art. The device can be used for the hot bending molding of 3D curved surface glass, and the rate of heating during hot bending molding is fast, and carries out the curved production efficiency height of 3D curved surface glass heat, low in production cost, production yields height, equipment stability is good, the fault rate is low.
The invention also aims to provide a method for hot bending the curved glass capable of being rapidly heated. The method is realized based on the rapid heating curved glass hot bending device, and the hot bending forming of the 3D curved glass can be completed rapidly and efficiently, so that the production requirement of the future market on the 3D curved glass can be effectively met.
The purpose of the invention is realized by the following technical scheme.
A rapid heating curved glass hot bending device comprises a high-frequency heater, an inner furnace, an outer furnace and a graphite mold;
the high-frequency heater can generate and output high-frequency heating current or intermediate-frequency heating current; an inlet and an outlet are respectively arranged at two ends of the inner furnace; the inner furnace is externally connected with a vacuum pump; an annular copper pipe which is circularly wound into turns is arranged inside the furnace body of the inner furnace, and the length direction of the annular copper pipe is along the direction from the inlet to the outlet of the inner furnace; two ends of the annular copper pipe are respectively connected with a water outlet pipe and a water inlet pipe of the high-frequency heater; the graphite mould is used for containing plane glass and is sent into the furnace body of the inner furnace for hot bending forming;
the inner furnace is arranged in the outer furnace and is wrapped by the outer furnace; and a heat insulation plate is arranged between the inner furnace and the outer furnace.
Preferably, the high-frequency heater can generate and output 3.75KW-50KW and 500 KHz-1000 KHz high-frequency heating current or generate and output 50 KW-200 KW and 20-100 KHz intermediate-frequency current.
Preferably, a cold water pipe is arranged at the top of the inner furnace.
Preferably, the inlet and the outlet of the inner furnace are both provided with a gate, and the gate can enable the furnace body of the inner furnace to form a closed space after being closed.
Preferably, the inner furnace is also provided with a temperature sensor; the temperature sensor is connected with the high-frequency heater through a PLC controller.
More preferably, the inner furnace is provided with a glass window; the temperature sensor is arranged on the outer side of the inner furnace, and a detection head of the temperature sensor penetrates through the glass window and extends into the furnace body of the inner furnace.
Preferably, the graphite mold comprises an upper mold and a lower mold; and a concave-convex surface matched with the curved glass forming shape is arranged between the upper die and the lower die.
Preferably, the annular copper pipe comprises more than two pipes arranged side by side.
Preferably, the inner furnaces comprise more than two inner furnaces which are arranged side by side, and a heat insulation plate is arranged between every two adjacent inner furnaces.
A method for quickly heating curved glass by hot bending comprises the following steps:
(1) placing the plane glass on a graphite mold, pushing the graphite mold into a furnace body of an inner furnace, closing an inlet and an outlet of the inner furnace, and vacuumizing the inner furnace to keep negative pressure;
(2) starting the high-frequency heater, transmitting high-frequency heating current generated by the high-frequency heater to the annular copper pipe and generating an induction magnetic field, so that the graphite mould positioned in the annular copper pipe generates induction current to generate heat;
(3) adjusting the first temperature point, and controlling the time and the vacuum pressure of the adjusting process; the first temperature point is adjusted by adjusting the frequency of heating current generated by the high-frequency heater; the temperature range of the first temperature point is 700-800 ℃, and the temperature is 50-100 ℃ lower than the softening point temperature of the glass manufactured at present; in the first temperature point adjusting stage, the temperature rise time range is controlled to be 30-40 s, and the vacuum degree range of the vacuum pressure is controlled to be 50-20 KPa;
(4) adjusting the frequency of the heating current generated by the high-frequency heater to reach a second temperature point; the second temperature point is the softening point temperature of the glass manufactured at present or is close to the softening point temperature of the glass manufactured at present; the second temperature point is controlled to be 750-900 ℃, and the temperature adjusting time is 10-20 s; meanwhile, in the process of adjusting the second temperature point, controlling the vacuum negative pressure to be 20 Kpa-9 Kpa;
(5) then adjusting the frequency of the heating current generated by the high-frequency heater, and cooling to a third temperature point, wherein the temperature of the third temperature point is 100-200 ℃ lower than that of the annealing point of the currently manufactured glass; the third temperature point is controlled to be 200-300 ℃, and the cooling regulation time is 30-40 s; in the process of adjusting the third temperature point, the glass needs shape keeping, pressure reduction is started, and the vacuum negative pressure is controlled to be 9-20 Kpa;
(6) adjusting the frequency of the heating current generated by the high-frequency heater to reach a fourth temperature point, and finishing the annealing of the product; the fourth temperature point is the annealing point temperature of the currently manufactured glass or is close to the annealing point temperature of the currently manufactured glass, the fourth temperature point is controlled to be 300-400 ℃, and the temperature adjusting time is 20-30 s; meanwhile, in the process of adjusting the fourth temperature point, controlling the vacuum negative pressure to be 20 Kpa-50 Kpa;
(7) turning off the high-frequency heater, stopping vacuumizing the inner furnace, and cooling to a fifth temperature point; the fifth temperature point is controlled to be room temperature, and the temperature adjusting time is 40-60 s; meanwhile, in the process of adjusting the fifth temperature point, controlling the vacuum negative pressure to be 50 Kpa-101 Kpa;
(8) and opening an inlet and an outlet of the inner furnace, pushing out the graphite mold, and taking down the molded curved glass.
Preferably, the graphite mold is heated to the glass softening point temperature within 60 seconds, namely, the graphite mold is fed into the inner furnace, the high-frequency heater is started to adjust the temperature, and the second temperature point is heated and adjusted within 60 seconds.
Preferably, in the adjusting process of cooling to the fifth temperature point, circulating cooling water is adopted for cooling.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) the curved glass hot bending device has a high-frequency and medium-frequency mixed dual-frequency induction heating mode, the center of the graphite mold can be heated firstly, and then the edge of the graphite mold is heated, so that the part of the graphite mold corresponding to glass is heated firstly, the glass reaches the set softening point temperature more quickly, and the glass is heated quickly, and the production efficiency is accelerated; and moreover, the double-frequency induction heating mode of mixing high frequency and medium frequency is adopted, so that the power is low, the energy consumption is saved, and the cost is effectively saved.
(2) According to the curved-surface glass hot bending device, the full-surrounding red copper tube is adopted for induction heating, a graphite mold does not need to be contacted, the graphite mold cannot be oxidized, the mold cannot be influenced, and the graphite mold does not need to be protected by nitrogen, so that the mold protection cost is effectively reduced, and the overall production cost is reduced; and the graphite mold and the glass are heated in a non-contact manner, so that the surface appearance of the manufactured product is good, the defects of stamping, concave-convex points and the like are avoided, the production time can be saved for the back-end scanning process, and the cost is further saved.
(3) The curved glass hot bending device has a high-frequency and medium-frequency mixed dual-frequency induction heating mode, is formed by vacuum pressure bending, does not need to be provided with an upper lifting mechanism and an inner shifting fork mechanism, simplifies the mechanism of equipment, and greatly reduces the failure rate of the equipment; and consumables comprising an electric heating tube, an infrared lamp tube and a pressing section vapor chamber are not needed, so that the production and manufacturing cost can be greatly saved.
(4) The curved glass hot bending device has a high-frequency and medium-frequency mixed dual-frequency induction heating mode, and the heating temperature of a graphite mold can be effectively controlled by controlling the current frequency; an outer furnace is wrapped outside the inner furnace, and a heat insulation plate is used for heat insulation protection in a closed cavity of the outer furnace, so that the internal temperature is prevented from expanding outwards, and the temperature balance of the glass is well ensured.
(5) The curved glass hot bending device provided by the invention adopts a multi-station inner furnace independent heating mode, so that the device can continuously work without stopping, and the production efficiency of the device is greatly exerted.
(6) The curved glass hot bending method is realized based on the rapidly heated curved glass hot bending device, and the high-frequency and medium-frequency mixed dual-frequency induction heating is adopted, so that the hot bending forming of the 3D curved glass can be completed rapidly and efficiently, and the production requirement of the future market on the 3D curved glass can be effectively met.
Drawings
FIG. 1 is a schematic view showing the overall structure of a rapid-heating curved glass hot-bending apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of a high frequency heater in the rapid heating curved glass hot bending apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic view showing the construction of an inner furnace of the rapid heating curved glass hot bending apparatus according to the present invention in an exemplary embodiment;
FIG. 4 is a schematic structural view of an annular copper tube disposed in an inner furnace of the rapid heating curved glass hot bending apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic structural view illustrating operation of a graphite mold in the apparatus for hot bending rapidly-heated curved glass according to the embodiment of the present invention;
FIG. 6a is a schematic view of an inner furnace wrapped in an outer furnace of the apparatus for hot bending rapidly heated curved glass according to the present invention in an exemplary embodiment;
FIG. 6b is a schematic cross-sectional view of FIG. 6 a;
FIG. 7 is a schematic view of the structure of the outer furnace of the rapid heating curved glass hot bending apparatus according to the present invention in an exemplary embodiment;
the attached drawings are marked as follows: 1-high-frequency heater, 100-high-frequency heater body, 101-high-frequency heater split machine, 102-water inlet pipe, 103-water outlet pipe, 2-inner furnace, 200-furnace chamber, 201-inner furnace upper cover, 21-inner furnace inlet, 22-inner furnace outlet, 23-cold water pipe, 24-glass window, 25-gate, 3-outer furnace, 300-outer cavity, 301-outer furnace open and close cover, 4-graphite mold, 41-upper mold, 42-lower mold, 5-annular copper pipe, 501-water inlet end vacuum insulation flange electrode, 502-water outlet end vacuum insulation flange electrode, 6-heat insulation plate, 7-temperature sensor and 8-curved glass.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to specific examples and drawings, but the scope and implementation of the present invention are not limited thereto. In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", and the like are used for distinguishing the description only and for the purpose of facilitating the description of the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have the specific order, be constructed in the specific order, and operate, and therefore, should not be construed as limiting the present invention, nor should be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, a fast heating curved glass hot bending device of the present embodiment is shown. The curved glass hot bending device comprises a high-frequency heater 1, an inner furnace 2, an outer furnace 3 and a graphite mold 4. The graphite mold 4 is used for containing plane glass and is sent into the furnace body of the inner furnace 2 for hot bending forming; the outer furnace 3 is used for wrapping the outer side of the inner furnace 2, so that the waste of temperature loss is avoided; the high-frequency heater 1 is used for generating and outputting alternating current to inductively heat the graphite mold 4 in the internal furnace 2, and further heating the plane glass on the graphite mold 4.
Specifically, the high-frequency heater 1 may generate and output a high-frequency heating current or an intermediate-frequency heating current. Specifically, the high-frequency heater 1 can generate and output a high-frequency heating current of 3.75KW-50KW and 500 KHz-1000 KHz, or generate and output a medium-frequency current of 50 KW-200 KW and 20-100 KHz.
Referring to fig. 2, the high-frequency heater 1 in the present embodiment includes a high-frequency heater body 100, and a high-frequency heater split machine 101 connected to the high-frequency heater body 100; the high-frequency heater split machine 101 is provided with a conductive water inlet pipe 102 and a conductive water outlet pipe 103.
Referring to fig. 3, in the present embodiment, the inner furnace 2 is composed of a furnace chamber 200 and an inner furnace top cover 201, wherein the inner furnace top cover 201 covers the upper end of the furnace chamber 200 to form a cavity. And the two ends of the inner furnace 2 formed by covering the furnace chamber 200 and the inner furnace upper cover 201 are respectively provided with an inlet 21 and an outlet 22 for accommodating the pushing and the pushing of the graphite mold 4. Moreover, in an alternative embodiment, a pushing mechanism and a receiving mechanism for pushing and receiving the graphite mold may be provided at the inlet 21 and the outlet 22, respectively. The inlet 21 and the outlet 22 of the inner furnace 2 are both provided with a gate 25, and the gate 25 can enable the furnace body of the inner furnace 2 to form a closed space after being closed. And, the interior stove 2 is external to be connected with the vacuum pump, draws through the vacuum pump work, makes interior stove 2 interior formation vacuum pressure.
The inner furnace 2 is characterized in that an annular copper pipe 5 which is wound into turns in a surrounding mode is arranged inside the furnace body, and the annular copper pipe 5 comprises more than two annular copper pipes which are arranged side by side, so that hot bending forming processing of a plurality of curved-surface glass can be carried out simultaneously, and production efficiency is improved. In the present embodiment, three annular copper pipes 5 are arranged side by side in the furnace body of the inner furnace 2.
Referring to fig. 4, the length direction of the ring-shaped copper pipe 5 is along the inlet-to-outlet direction of the inner furnace 2. And a water inlet end vacuum insulation flange electrode 501 and a water outlet end vacuum insulation flange electrode 502 are respectively arranged at the water inlet end and the water outlet end of the annular copper pipe 5, the water inlet end and the water outlet end of the annular copper pipe 5 are respectively connected with the water outlet pipe and the water inlet pipe of the high-frequency heater 1, in this embodiment, the water inlet end vacuum insulation flange electrode 501 is connected with the water outlet pipe 103 on the high-frequency heater split machine 101, and the water outlet end vacuum insulation flange electrode 502 is connected with the water inlet pipe 102 on the high-frequency heater split machine 101.
And, a cold water pipe 23 is provided on the top of the inner furnace 2, specifically, in this embodiment, the cold water pipe 23 is provided on the inner furnace upper cover 201. During hot bending operation, circulating water can be introduced into the cold water pipe 23, so that the upper cover 201 of the inner furnace is prevented from being burnt out due to overhigh temperature.
In addition, the inner furnace 2 is further provided with a temperature sensor 7, specifically, in this embodiment, the temperature sensor 7 is an infrared temperature sensor. The temperature sensor 7 is connected with the high-frequency heater 1 through a PLC controller. Specifically, in this embodiment, a glass window 24 is disposed on the inner furnace 2; the temperature sensor 7 is arranged on the outer side of the inner furnace 2, a detection head of the temperature sensor 7 penetrates through the glass window 24 and extends into the furnace body of the inner furnace 2, and the temperature of the graphite mold 4 in the inner furnace 2 can be accurately detected and detected in an adjustable mode through the driving of a motor. During hot bending operation, a probe of the temperature sensor 7 can be deeply inserted into the furnace body of the inner furnace 2, so that the heating temperature (namely the heating temperature of glass) of the graphite mold 4 can be accurately detected, and the current frequency can be controlled in real time through the real-time feedback connection of the temperature sensor 7 and the high-frequency heater 1, so that the heating temperature of the graphite mold 4 can be effectively controlled.
Further, in this embodiment, along import to the export direction of interior stove 2, temperature sensor 7 is provided with two, can carry out real-time intensive monitoring to the heating condition of graphite jig 4 in interior stove 2, improves the accurate control to the heating temperature of graphite jig 4.
Referring to fig. 5, the graphite mold 4 includes an upper mold 41 and a lower mold 42; a concave-convex surface matched with the forming shape of the curved glass 8 is arranged between the upper die 41 and the lower die 42.
When the device works, the plane glass is placed on the graphite mould 4, the graphite mould 4 is sent into the inner furnace 2, and the high-frequency heater 1 outputs high-frequency heating current or intermediate-frequency heating current to the annular copper tube 5, so that the graphite mould 4 induces an electromagnetic field generated by the annular copper tube 5 and forms eddy current to generate heat, and the plane glass is heated; in a vacuum environment, the flat glass heated to the softening point is bent under the gravity of the upper mold 41 of the graphite mold 4 to form curved glass. The alternating current generated by the high-frequency heater 2 is transmitted to the high-frequency heater split machine 101, then transmitted to the annular copper pipe 5 from the water inlet end vacuum insulation flange electrode 501 on the annular copper pipe 5 through the water outlet pipe 103 on the high-frequency heater split machine 101, and the current circulates in the annular copper pipe 5 and is input to the water inlet pipe 102 on the high-frequency heater split machine 101 through the water outlet end vacuum insulation flange electrode 502, so as to flow back to the high-frequency heater 1. In the current transmission process, the water outlet pipe 103 of the split machine 101 of the high-frequency heater injects circulating water into the annular copper pipe 5, and the circulating water flows back through the water inlet pipe 102 after flowing through the annular copper pipe 5, and circulates in the annular copper pipe 5, so that the annular copper pipe 5 is prevented from being punctured when high-frequency current is introduced into the annular copper pipe 5 to perform induction heating on the graphite mold 4, and the annular copper pipe 5 is effectively protected.
Moreover, the high-frequency heater 1 can generate and output high-frequency heating current or intermediate-frequency heating current, so that the device can adopt a double-frequency induction heating mode of mixing high frequency and intermediate frequency when carrying out curved glass hot bending forming. In the initial heating stage, the center of the graphite mold 4 can be heated by adopting high-frequency heating current, and then the edge of the graphite mold 4 is heated by adopting medium-frequency heating current, so that the part of the graphite mold 4 corresponding to the glass is heated first, the glass can reach the set softening point temperature more quickly, and the glass is heated quickly, thereby accelerating the production efficiency; and moreover, the double-frequency induction heating mode of mixing high frequency and medium frequency is adopted, so that the power is low, the energy consumption is saved, and the cost is effectively saved.
And, still have mould in interior stove 2 and bear the guide rail for bearing the graphite jig and advance, surface finish reaches Ra =0.8 mu m, can effectually avoid the graphite jig to produce the phenomenon of falling powder at the slip process.
Referring to fig. 6a and 6b, the inner furnace 2 is disposed inside the outer furnace 3 and is wrapped by the outer furnace 3. Referring to fig. 7, the outer furnace 3 is composed of an outer cavity 300 and an outer furnace opening and closing cover 301, the outer cavity 300 is a cavity formed by a stainless steel plate, and the outer furnace opening and closing cover 301 covers the outer wall 300; and a heat insulation plate 6 is arranged between the inner furnace 2 and the outer furnace 3, so that heat generated in the inner furnace 2 can be effectively prevented from being dissipated.
In this embodiment, interior stove 2 is two for setting up side by side, and two interior stoves 2 that set up side by side all wrap up the setting in outer stove 3.
Example 2
A method for hot bending curved glass by rapid heating, which adopts the device described in embodiment 1 to heat, comprises the following steps:
(1) placing the plane glass on a graphite mold, pushing the graphite mold into a furnace body of an inner furnace, closing an inlet and an outlet of the inner furnace, and vacuumizing the inner furnace to keep negative pressure;
(2) starting the high-frequency heater, transmitting high-frequency heating current generated by the high-frequency heater to the annular copper pipe and generating an induction magnetic field, so that the graphite mould positioned in the annular copper pipe generates induction current to generate heat;
(3) adjusting the first temperature point, and controlling the time and the vacuum pressure of the adjusting process; the first temperature point is adjusted by adjusting the frequency of heating current generated by the high-frequency heater; the temperature range of the first temperature point is 700-800 ℃, and the temperature is 50-100 ℃ lower than the softening point temperature of the glass manufactured at present; in the first temperature point adjusting stage, the temperature rise time range is controlled to be 30-40 s, and the vacuum degree range of the vacuum pressure is controlled to be 50-20 KPa;
(4) adjusting the frequency of the heating current generated by the high-frequency heater to reach a second temperature point; the second temperature point is the softening point temperature of the glass manufactured at present or is close to the softening point temperature of the glass manufactured at present; the second temperature point is controlled to be 750-900 ℃, and the temperature adjusting time is 10-20 s; meanwhile, in the process of adjusting the second temperature point, controlling the vacuum negative pressure to be 20 Kpa-9 Kpa;
and (3) feeding the graphite mold into the inner furnace, starting a high-frequency heater to adjust the temperature, and heating in 60 to adjust a second temperature point.
(5) Then adjusting the frequency of the heating current generated by the high-frequency heater, and cooling to a third temperature point, wherein the temperature of the third temperature point is 100-200 ℃ lower than that of the annealing point of the currently manufactured glass; the third temperature point is controlled to be 200-300 ℃, and the cooling regulation time is 30-40 s; in the process of adjusting the third temperature point, the glass needs shape keeping, pressure reduction is started, and the vacuum negative pressure is controlled to be 9-20 Kpa;
(6) adjusting the frequency of the heating current generated by the high-frequency heater to reach a fourth temperature point, and finishing the annealing of the product; the fourth temperature point is the annealing point temperature of the currently manufactured glass or is close to the annealing point temperature of the currently manufactured glass, the fourth temperature point is controlled to be 300-400 ℃, and the temperature adjusting time is 20-30 s; meanwhile, in the process of adjusting the fourth temperature point, controlling the vacuum negative pressure to be 20 Kpa-50 Kpa;
(7) turning off the high-frequency heater, stopping vacuumizing the inner furnace, and cooling to a fifth temperature point; the fifth temperature point is controlled to be room temperature, and the temperature adjusting time is 40-60 s; meanwhile, in the process of adjusting the fifth temperature point, controlling the vacuum negative pressure to be 50 Kpa-101 Kpa; in the adjusting process of cooling to the fifth temperature point, circulating cooling water is adopted for cooling;
(8) and opening an inlet and an outlet of the inner furnace, pushing out the graphite mold, and taking down the molded curved glass.
In this embodiment, the adjustment of the first temperature point, the second temperature point, the third temperature point, the fourth temperature point and the fifth temperature point is controlled and adjusted by a PLC control program, so that the adjustment precision is higher, and the adjusted temperature is more stable.
The above embodiments are merely preferred embodiments of the present invention, and the technical solutions of the present invention are described in further detail, but the scope and implementation of the present invention are not limited thereto, and any changes, combinations, deletions, substitutions or modifications that do not depart from the spirit and principle of the present invention are included in the scope of the present invention.
Claims (10)
1. A curved glass hot bending device capable of heating rapidly is characterized by comprising a high-frequency heater (1), an inner furnace (2), an outer furnace (3) and a graphite mold (4);
the high-frequency heater (1) can generate and output high-frequency heating current or intermediate-frequency heating current; an inlet (21) and an outlet (22) are respectively arranged at two ends of the inner furnace (2); the inner furnace (2) is externally connected with a vacuum pump; an annular copper pipe (5) which is circularly wound into turns is arranged inside the furnace body of the inner furnace (2), and the length direction of the annular copper pipe (5) is along the direction from the inlet to the outlet of the inner furnace (2); two ends of the annular copper pipe (5) are respectively connected with a water outlet pipe and a water inlet pipe of the high-frequency heater (1); the graphite mould (4) is used for containing plane glass and is sent into the furnace body of the inner furnace (2) for hot bending forming;
the inner furnace (2) is arranged in the outer furnace (3) and is wrapped by the outer furnace (3); and a heat insulation plate (6) is arranged between the inner furnace (2) and the outer furnace (3).
2. The curved glass hot-bending device capable of rapidly heating according to claim 1, wherein the high-frequency heater (1) can generate and output a high-frequency heating current of 3.75KW-50KW and 500 KHz-1000 KHz, or generate and output a medium-frequency current of 50 KW-200 KW and 20 KHz-100 KHz.
3. A rapid heating curved glass hot bending apparatus according to claim 1, wherein a cold water pipe (23) is provided on the top of the inner furnace (2).
4. A rapid heating curved glass hot bending device according to claim 1, characterized in that the inlet (21) and the outlet (22) of the inner furnace (2) are provided with gates, and the gates can form a closed space in the body of the inner furnace (2) after being closed.
5. A rapid heating curved glass hot bending apparatus according to claim 1, wherein a temperature sensor (7) is further provided on the inner furnace (2); the temperature sensor (7) is connected with the high-frequency heater (1) through a PLC controller.
6. A rapid heating curved glass hot bending apparatus according to claim 5, wherein the inner furnace (2) is provided with a glass window (24); the temperature sensor (7) is arranged on the outer side of the inner furnace (2), and a detection head of the temperature sensor (7) penetrates through the glass window (24) and extends into the furnace body of the inner furnace (2).
7. A rapid-heating curved glass hot-bending apparatus according to claim 1, wherein the graphite mold (4) comprises an upper mold (41) and a lower mold (42); and a concave-convex surface matched with the forming shape of the curved glass is arranged between the upper die (41) and the lower die (42).
8. A rapid heating curved glass hot-bending apparatus according to claim 1, wherein the annular copper tube (5) comprises more than two arranged side by side.
9. A rapid heating curved glass hot-bending apparatus according to any one of claims 1 to 8, characterized in that the inner furnaces (2) comprise more than two inner furnaces (2) arranged side by side, and a heat insulating plate (6) is arranged between two adjacent inner furnaces (2).
10. A method for hot bending rapidly heated curved glass, characterized in that the heating is carried out by the apparatus according to any one of claims 1 to 9, comprising the steps of:
(1) placing the plane glass on a graphite mold, pushing the graphite mold into a furnace body of an inner furnace, closing an inlet and an outlet of the inner furnace, and vacuumizing the inner furnace to keep negative pressure;
(2) starting the high-frequency heater, transmitting heating current generated by the high-frequency heater to the annular copper pipe and generating an induction magnetic field, so that the graphite mould positioned in the annular copper pipe generates induction current to generate heat;
(3) adjusting the frequency of heating current generated by a high-frequency heater, and heating to a first temperature point which is 50-100 ℃ lower than the softening point temperature of the glass; the first temperature point is controlled to be 700-800 ℃, and the temperature rise regulating time is 30-40 s; meanwhile, in the process of adjusting the first temperature point, the vacuum negative pressure is kept at 50-20 KPa;
(4) continuously adjusting the frequency of the heating current generated by the high-frequency heater to reach a second temperature point; the second temperature point is controlled to be 750-900 ℃, and the temperature adjusting time is 10-20 s; meanwhile, in the process of adjusting the second temperature point, controlling the vacuum negative pressure to be 20 Kpa-9 Kpa;
(5) then adjusting the frequency of the heating current generated by the high-frequency heater, and cooling to a third temperature point which is 100-200 ℃ lower than the temperature of the annealing point; the third temperature point is controlled to be 200-300 ℃, and the cooling regulation time is 30-40 s; controlling the vacuum negative pressure to be 9-20 Kpa in the process of adjusting the third temperature point;
(6) adjusting the frequency of the heating current generated by the high-frequency heater to reach a fourth temperature point, and finishing the annealing of the product; the fourth temperature point is controlled to be 300-400 ℃, and the temperature adjusting time is 20-30 s; meanwhile, in the process of adjusting the fourth temperature point, controlling the vacuum negative pressure to be 20 Kpa-50 Kpa;
(7) turning off the high-frequency heater, stopping vacuumizing the inner furnace, and cooling to a fifth temperature point; the fifth temperature point is controlled to be room temperature, and the temperature adjusting time is 40-60 s; meanwhile, in the process of adjusting the fifth temperature point, controlling the vacuum negative pressure to be 50 Kpa-101 Kpa;
(8) and opening an inlet and an outlet of the inner furnace, pushing out the graphite mold, and taking down the molded curved glass.
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| CN201911270330.1A CN110963678A (en) | 2019-12-12 | 2019-12-12 | Rapid-heating curved glass hot bending device and method |
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| CN201911270330.1A CN110963678A (en) | 2019-12-12 | 2019-12-12 | Rapid-heating curved glass hot bending device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114275999A (en) * | 2022-02-17 | 2022-04-05 | 苏州众可为智能科技有限公司 | Electromagnetic heating temperature equalizing platform |
Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE575806A (en) * | 1958-02-18 | 1959-08-17 | Saint Gobain | Bending device. |
| GB1521231A (en) * | 1976-01-22 | 1978-08-16 | Comp Generale Electricite | Induction furnace |
| US6229126B1 (en) * | 1998-05-05 | 2001-05-08 | Illinois Tool Works Inc. | Induction heating system with a flexible coil |
| US20030033833A1 (en) * | 2001-08-10 | 2003-02-20 | Hoya Corporation | Press molding apparatus and method of producing a glass optical element using the apparatus |
| CN2641043Y (en) * | 2003-07-29 | 2004-09-15 | 洛阳北方玻璃技术股份有限公司 | Glass lifting negative pressure mould loader in bend toughened glasls prodn. equipment |
| CN102264655A (en) * | 2008-11-25 | 2011-11-30 | 康宁股份有限公司 | Progressive pressing to form glass article |
| CN104860514A (en) * | 2015-05-19 | 2015-08-26 | 青岛元盛光学有限公司 | Production technology for hot bending of bent glass |
| JP5877920B1 (en) * | 2015-04-28 | 2016-03-08 | 株式会社ワイエイシイデンコー | Rapid heating / cooling heat treatment furnace |
| CN205528402U (en) * | 2016-03-24 | 2016-08-31 | 蓝思科技（长沙）有限公司 | Curved surface glass's multistation heat pressing building machine |
| TWM546396U (en) * | 2017-05-26 | 2017-08-01 | 盟立自動化股份有限公司 | Glass molding apparatus |
| CN107814479A (en) * | 2017-12-01 | 2018-03-20 | 深圳市拓野机器人自动化有限公司 | A kind of 3D glass bendings processing unit (plant) |
| CN207143103U (en) * | 2017-08-07 | 2018-03-27 | 蓝思科技（长沙）有限公司 | A kind of glass product hot bending device |
| CN207418584U (en) * | 2017-10-23 | 2018-05-29 | 深圳市尊泰自动化设备有限公司 | 3D bend glass bending apparatus based on high-frequency heating |
| CN108147650A (en) * | 2018-01-05 | 2018-06-12 | 深圳市普天达自动化设备有限公司 | A kind of heating in vacuum based on high frequency hot-bending machine is pressed together method |
| CN108609839A (en) * | 2018-06-15 | 2018-10-02 | 苏州市台群机械有限公司 | Mold preheating and transmission device and glass heat bender |
| CN209061854U (en) * | 2018-08-29 | 2019-07-05 | 广州倬粤动力新能源有限公司 | Furnace body heating device |
| CN110372183A (en) * | 2019-07-05 | 2019-10-25 | 哈尔滨奥瑞德光电技术有限公司 | A kind of vehicle-mounted glass heat bender structure of one-stop heating in medium frequency 3D |
| CN110451786A (en) * | 2018-05-08 | 2019-11-15 | 凯茂科技(深圳)有限公司 | A kind of hot bending process equipment and the method for processing 3D bend glass cover board |
-
2019
- 2019-12-12 CN CN201911270330.1A patent/CN110963678A/en active Pending
Patent Citations (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE575806A (en) * | 1958-02-18 | 1959-08-17 | Saint Gobain | Bending device. |
| GB1521231A (en) * | 1976-01-22 | 1978-08-16 | Comp Generale Electricite | Induction furnace |
| US6229126B1 (en) * | 1998-05-05 | 2001-05-08 | Illinois Tool Works Inc. | Induction heating system with a flexible coil |
| US20030033833A1 (en) * | 2001-08-10 | 2003-02-20 | Hoya Corporation | Press molding apparatus and method of producing a glass optical element using the apparatus |
| CN2641043Y (en) * | 2003-07-29 | 2004-09-15 | 洛阳北方玻璃技术股份有限公司 | Glass lifting negative pressure mould loader in bend toughened glasls prodn. equipment |
| CN102264655A (en) * | 2008-11-25 | 2011-11-30 | 康宁股份有限公司 | Progressive pressing to form glass article |
| JP5877920B1 (en) * | 2015-04-28 | 2016-03-08 | 株式会社ワイエイシイデンコー | Rapid heating / cooling heat treatment furnace |
| CN104860514A (en) * | 2015-05-19 | 2015-08-26 | 青岛元盛光学有限公司 | Production technology for hot bending of bent glass |
| CN205528402U (en) * | 2016-03-24 | 2016-08-31 | 蓝思科技（长沙）有限公司 | Curved surface glass's multistation heat pressing building machine |
| TWM546396U (en) * | 2017-05-26 | 2017-08-01 | 盟立自動化股份有限公司 | Glass molding apparatus |
| CN207143103U (en) * | 2017-08-07 | 2018-03-27 | 蓝思科技（长沙）有限公司 | A kind of glass product hot bending device |
| CN207418584U (en) * | 2017-10-23 | 2018-05-29 | 深圳市尊泰自动化设备有限公司 | 3D bend glass bending apparatus based on high-frequency heating |
| CN107814479A (en) * | 2017-12-01 | 2018-03-20 | 深圳市拓野机器人自动化有限公司 | A kind of 3D glass bendings processing unit (plant) |
| CN108147650A (en) * | 2018-01-05 | 2018-06-12 | 深圳市普天达自动化设备有限公司 | A kind of heating in vacuum based on high frequency hot-bending machine is pressed together method |
| CN110451786A (en) * | 2018-05-08 | 2019-11-15 | 凯茂科技(深圳)有限公司 | A kind of hot bending process equipment and the method for processing 3D bend glass cover board |
| CN108609839A (en) * | 2018-06-15 | 2018-10-02 | 苏州市台群机械有限公司 | Mold preheating and transmission device and glass heat bender |
| CN209061854U (en) * | 2018-08-29 | 2019-07-05 | 广州倬粤动力新能源有限公司 | Furnace body heating device |
| CN110372183A (en) * | 2019-07-05 | 2019-10-25 | 哈尔滨奥瑞德光电技术有限公司 | A kind of vehicle-mounted glass heat bender structure of one-stop heating in medium frequency 3D |
Non-Patent Citations (1)
| Title |
|---|
| 钱苗根等: "《现代表面技术》", pages: 177 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114275999A (en) * | 2022-02-17 | 2022-04-05 | 苏州众可为智能科技有限公司 | Electromagnetic heating temperature equalizing platform |
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