CN106830646B - Curved glass forming method for mobile terminal - Google Patents

Curved glass forming method for mobile terminal Download PDF

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Publication number
CN106830646B
CN106830646B CN201710124229.XA CN201710124229A CN106830646B CN 106830646 B CN106830646 B CN 106830646B CN 201710124229 A CN201710124229 A CN 201710124229A CN 106830646 B CN106830646 B CN 106830646B
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curved
cooling
module
main
forming
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CN106830646A (en
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詹胜文
傅思健
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Dongguan Entebeisi Intelligent Technology Co ltd
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Dongguan Entebeisi Intelligent Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C03GLASS; MINERAL OR SLAG WOOL
    • C03BMANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B23/00Re-forming shaped glass
    • C03B23/02Re-forming glass sheets
    • C03B23/023Re-forming glass sheets by bending
    • C03B23/03Re-forming glass sheets by bending by press-bending between shaping moulds
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/50Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57Improving the yield, e-g- reduction of reject rates

Abstract

The invention discloses a curved glass forming method of a mobile terminal, which comprises the following steps: sending the 3D curved surface forming die with the single plane glass blank into a forming chamber; heating the 3D curved surface forming die in stages in a heat conduction mode sequentially through a plurality of preheating modules in advance; after preheating is finished, the single plane glass blank is hot-pressed and molded into a 3D curved glass product stage by stage through a plurality of hot-pressing modules; and after the profiling is finished, the 3D curved surface forming die is cooled stage by stage in a heat conduction mode sequentially through the plurality of cooling modules and the liquid cooling channels, and the product discharging is finished. According to the invention, the plurality of preheating modules, the plurality of hot pressing modules and the plurality of cooling modules which are arranged in a flow line form are adopted to carry out hot pressing stage by stage, so that the material internal stress in the 3D curved glass forming process is greatly reduced, the generation of fine cracks is reduced, the yield of the curved glass is obviously improved, the forming period of the curved glass is shortened, and the production efficiency is improved.

Description

Curved glass forming method for mobile terminal
Technical Field
The invention relates to the technical field of 3D curved glass screens, rear covers, protection screens, processing equipment and processing processes of the processing equipment of mobile terminals, in particular to a curved glass forming method of a mobile terminal.
Background
With the development of mobile terminals (smart phones, tablet computers and the like), except for the smart phones with curved screens, which are released by samsung and LG, smart phones released by apples are more non-planar glass with arc chamfers at the edges, that is, the middle area of the glass is a plane and the edges of the glass are curved for transition, and the non-planar glass belongs to the field of the 3D curved glass of the smart phones.
The preheating upper heating plate of the preheating mechanism in the prior art is preheated in a state of not contacting with a mold in equipment for processing curved glass products, so that the heat conduction efficiency is very low, the mold cannot be quickly raised to the required preheating temperature, the molded mold heated to high temperature by the molding mechanism is sent to a cooling line for cooling, the glass with a curved surface part molded by the rapid change of the temperature is frequently damaged, and the time period for integrally molding the curved glass is also prolonged.
In addition, because the processing difficulty of the 3D curved glass is high, the process route is also complex, the existing non-planar glass generally adopts a cold processing mode, namely, the edge of the planar glass is ground and polished to obtain the required cambered surface edge; however, fine cracks are easy to remain on the non-planar glass by adopting a cold processing mode, so that the yield of the non-planar glass is greatly reduced; moreover, the size of the radian fillet which can be processed by the cold working mode is also limited.
Therefore, there is still a need for improvement and development of the prior art.
Disclosure of Invention
The invention aims to solve the technical problem that a plurality of preheating modules, a plurality of hot pressing modules and a plurality of cooling modules which are arranged in a flow line form are adopted to carry out hot pressing stage by stage, so that the material internal stress in the 3D curved glass forming process is greatly reduced, the generation of fine cracks is reduced, the yield of the curved glass is obviously improved, the curved glass forming period is shortened, and the production efficiency is improved.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a curved glass forming method for a mobile terminal comprises the following steps:
step A, placing a 3D curved surface forming die with a single piece of flat glass blank on a feeding port platform, and controlling a feeding cylinder to send the 3D curved surface forming die into a forming chamber after a sensing device senses the 3D curved surface forming die;
step B, after the 3D curved surface forming die enters the forming chamber, heating the 3D curved surface forming die in a heat conduction mode in stages by a first preheating module, a second preheating module, a third preheating module and a fourth preheating module which are arranged in a flow line mode in advance;
step C, after the 3D curved surface forming die is preheated, the single plane glass blank is hot-pressed and formed into a 3D curved surface glass product stage by stage sequentially through a first hot-pressing module, a second hot-pressing module and a third hot-pressing module which are arranged in a flow line manner;
step D, after the 3D curved surface forming die passes through the third hot pressing die, the 3D curved surface forming die is cooled in stages in a heat conduction mode through a first cooling die set, a second cooling die set, a third cooling die set and a fourth cooling die set which are arranged in a flow line mode in sequence;
and E, after the 3D curved surface forming die is cooled for four times, performing auxiliary cooling on the formed 3D curved surface glass product through the liquid cooling channel, and discharging the product.
The method for forming the curved glass of the mobile terminal comprises the following steps that the 3D curved glass forming die comprises an upper die and a lower die, a cavity is formed in one surface, facing the upper die, of the lower die, a boss is arranged on one surface, facing the lower die, of the upper die, the boss is matched with the cavity and used for hot-pressing a single flat glass blank placed in the cavity into the 3D curved glass in the state that the upper die and the lower die are closed, a closed clearance cavity is symmetrically formed in the middle of the bottom surface of the lower die, and the upper die and the lower die are both formed by machining block-shaped graphite.
According to the method for forming the curved glass of the mobile terminal, the preheating temperature of the first preheating module is 650 ℃, and the output pressure is 4-15 kg; the preheating temperature of the second preheating module is 750 ℃, and the output pressure is 4-15 kg; the preheating temperature of the third preheating module is 850 ℃, and the output pressure is 4-15 kg; the preheating temperature of the fourth preheating module is 950 ℃, and the output pressure is 4-20 kg; the preheating temperature of the 3D curved surface forming die is gradually preheated from low to high in sequence.
The method for forming the curved glass of the mobile terminal comprises the following steps that a first preheating module comprises an auxiliary cylinder, an auxiliary upper cooling plate, an auxiliary upper heating plate, an auxiliary lower heating plate and an auxiliary lower cooling plate, wherein the auxiliary cylinder is vertically arranged, the auxiliary upper cooling plate, the auxiliary upper heating plate, the auxiliary lower heating plate and the auxiliary lower cooling plate are also placed in a forming chamber, the auxiliary upper cooling plate is connected to the lower end of the auxiliary cylinder, and the auxiliary upper heating plate is connected to the lower part of the auxiliary upper cooling plate;
when the 3D curved surface forming die is preheated, the bottom surface of the auxiliary upper heating plate is used for being contacted with the top surface of the 3D curved surface forming die, the top surface of the auxiliary lower heating plate is used for being contacted with the bottom surface of the 3D curved surface forming die, and the auxiliary lower heating plate is connected onto the auxiliary lower cooling plate; the second preheating module and the third preheating module are both configured by parts same as those of the first preheating module.
The curved glass forming method for the mobile terminal is characterized in that the profiling temperatures of the first hot pressing module, the second hot pressing module and the third hot pressing module are 950 ℃, and the output pressures are all 0.001-0.8 Mpa.
The method for forming the curved glass of the mobile terminal comprises the following steps that a first hot pressing module comprises a main cylinder, a main upper cooling plate, a main upper heating plate, a main lower heating plate and a main lower cooling plate, wherein the main cylinder is vertically arranged, the main upper cooling plate, the main upper heating plate, the main lower heating plate and the main lower cooling plate are all placed in a closed forming chamber capable of exchanging air, the main upper cooling plate is connected to the lower end of the main cylinder, and the main upper heating plate is connected to the lower portion of the main upper cooling plate;
when the 3D curved surface forming die is subjected to hot press forming, the bottom surface of the main upper heating plate is used for being contacted with the top surface of the 3D curved surface forming die, the top surface of the main lower heating plate is used for being contacted with the bottom surface of the 3D curved surface forming die, and the main lower heating plate is connected onto the main lower cooling plate;
the second hot-pressing module and the third hot-pressing module are both configured by parts same as those of the first hot-pressing module; the fourth preheating module adopts the same part configuration as the first hot pressing module, and the auxiliary cylinder is used for replacing the main cylinder.
The curved glass forming method of the mobile terminal is characterized in that the first cooling module is configured by the same parts as the first hot-pressing module, and the second cooling module is configured by the same parts as the fourth preheating module;
when the 3D curved surface forming die passes through the first cooling module, the 3D curved surface forming die is cooled by heat transfer with a main upper cooling plate and a main lower cooling plate in the first cooling module;
when the 3D curved surface forming die passes through the second cooling module, the 3D curved surface forming die is cooled by heat transfer with an auxiliary upper cooling plate and an auxiliary lower cooling plate in the second cooling module;
and when the 3D curved surface forming die passes through the third cooling module and the fourth cooling module, water cooling is carried out through the liquid cooling plate arranged in the third cooling module and the fourth cooling module.
According to the method for forming the curved glass of the mobile terminal, the auxiliary upper heating plate and the auxiliary upper cooling plate and the auxiliary lower heating plate and the auxiliary lower cooling plate are connected through a plurality of spacers.
According to the method for forming the curved glass of the mobile terminal, a double-sided grid plate is arranged between the main upper heating plate and the main upper cooling plate and between the main lower heating plate and the main lower cooling plate.
The method for forming the curved glass of the mobile terminal comprises the steps that a double-sided grid plate is arranged between a main upper heating plate and a main upper cooling plate of the first cooling module, between a main lower heating plate and a main lower cooling plate of the first cooling module, between an auxiliary upper heating plate and an auxiliary upper cooling plate of the second cooling module, and between an auxiliary lower heating plate and an auxiliary lower cooling plate of the second cooling module.
The invention discloses a curved glass forming method of a mobile terminal, which comprises the steps of feeding a 3D curved forming die with a single flat glass blank into a forming chamber; heating the 3D curved surface forming die in stages in a heat conduction mode sequentially through a plurality of preheating modules in advance; after preheating is finished, the single plane glass blank is hot-pressed and molded into a 3D curved glass product stage by stage through a plurality of hot-pressing modules; and after the profiling is finished, the 3D curved surface forming die is cooled stage by stage in a heat conduction mode sequentially through the plurality of cooling modules and the liquid cooling channels, and the product discharging is finished. According to the invention, the plurality of preheating modules, the plurality of hot pressing modules and the plurality of cooling modules which are arranged in a flow line form are adopted to carry out hot pressing stage by stage, so that the material internal stress in the 3D curved glass forming process is greatly reduced, the generation of fine cracks is reduced, the yield of the curved glass is obviously improved, the forming period of the curved glass is shortened, and the production efficiency is improved.
Drawings
Fig. 1 is a flowchart of a method for forming curved glass of a mobile terminal according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a part of curved glass forming equipment of the mobile terminal of the invention.
Fig. 3 is a schematic diagram of a curved glass forming device structure and a processing flow of the mobile terminal of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a curved glass forming method of a mobile terminal according to a preferred embodiment of the present invention.
As shown in fig. 1, a method for forming curved glass of a mobile terminal according to an embodiment of the present invention includes the following steps:
step S100, placing a 3D curved surface forming die with a single piece of flat glass blank on a feeding port platform, and controlling a feeding cylinder to send the 3D curved surface forming die into a forming chamber after a sensing device senses the 3D curved surface forming die;
step S200, after the 3D curved surface forming die enters the forming chamber, heating the 3D curved surface forming die in a heat conduction mode in stages by a first preheating module, a second preheating module, a third preheating module and a fourth preheating module which are arranged in a flow line manner in advance;
step S300, after the 3D curved surface forming die is preheated, sequentially passing through a first hot pressing module, a second hot pressing module and a third hot pressing module which are arranged in a flow line form and are used for hot pressing and forming the single plane glass blank into a 3D curved surface glass product in stages;
step S400, after the 3D curved surface forming die passes through the third hot pressing die, the 3D curved surface forming die is cooled in stages in a heat conduction mode through a first cooling die set, a second cooling die set, a third cooling die set and a fourth cooling die set which are arranged in a flow line mode in sequence;
and S500, after the 3D curved surface forming die is cooled for four times, performing auxiliary cooling on the formed 3D curved surface glass product through the liquid cooling channel, and discharging the product.
As shown in fig. 2, fig. 2 is a schematic structural diagram of a part of a curved glass forming apparatus of a mobile terminal according to the present invention, fig. 2 only shows a main part of the forming apparatus, and a single flat glass blank is placed in a pre-made 3D curved forming mold (not shown), and is formed into a 3D curved glass product after passing through the hot pressing apparatus.
The 3D curved surface forming die comprises an upper die and a lower die, wherein a concave cavity is formed in one surface of the lower die, which faces the upper die, a boss is arranged on one surface of the upper die, which faces the lower die, the boss is matched with the concave cavity and used for hot-pressing a single sheet of flat glass blank placed in the concave cavity into 3D curved surface glass in a die closing state of the upper die and the lower die, a closed clearance concave cavity is symmetrically arranged in the middle of the bottom surface of the lower die, the clearance concave cavity can control the contact area and the position of the lower die and a main lower heating plate 114 of a profiling device, and can also control the pressure distribution when the upper die and the lower die are closed, so that a hot-pressing module can be fully arranged in a flow line form, and the flat glass placed in the forming die is hot-pressed and formed in a staged hot-pressing mode, the material internal stress of the 3D curved, obviously promote the yields of non-planar glass. In addition, the upper die and the lower die are both formed by machining blocky graphite.
The forming equipment mainly comprises a first hot pressing module 110, a second hot pressing module 120 and a third hot pressing module 130 which are arranged in a flow line mode, wherein the 3D curved surface forming die provided with the single-piece flat glass blank sequentially passes through the first hot pressing module 110, the second hot pressing module 120 and the third hot pressing module 130 along the arrow direction shown in the figure and is used for hot pressing the single-piece flat glass blank into a mobile terminal 3D curved surface glass product in stages.
Specifically, the first hot press module 110 includes a main cylinder 111, a main upper cooling plate 112, a main upper heating plate 113, a main lower heating plate 114, and a main lower cooling plate 115, wherein the main cylinder 111 is vertically disposed, the main upper cooling plate 112, the main upper heating plate 113, the main lower heating plate 114, and the main lower cooling plate 115 are all disposed in a closed and air-permeable forming chamber 400, the main upper cooling plate 112 is connected to a lower end of the main cylinder 111, and the main upper heating plate 113 is connected to a lower portion of the main upper cooling plate 112.
When the 3D curved surface forming mold is hot-press formed, the bottom surface of the main upper heating plate 113 is used to contact with the top surface of the 3D curved surface forming mold, the top surface of the main lower heating plate 114 is used to contact with the bottom surface of the 3D curved surface forming mold, and the main lower heating plate 114 is connected to the main lower cooling plate 115; the second thermal pressing module 120 and the third thermal pressing module 130 are configured by the same components as the first thermal pressing module 110.
The compression temperature of the first hot-pressing module 110, the second hot-pressing module 120 and the third hot-pressing module 130 is 950 degrees, the output pressure is 0.001-0.8 Mpa, and the output pressure is selected from 0.001-0.8 Mpa according to different requirements of products.
Preferably, a double-sided grid plate 116 is disposed between the main upper heating plate 113 and the main upper cooling plate 112, a double-sided grid plate 117 is disposed between the main lower heating plate 114 and the main lower cooling plate 115, and grid grooves are respectively formed on two sides of the double-sided grid plates 116 and 117, so that the temperature rise speed of the 3D curved surface forming mold can be slowed down after the assembly.
In a preferred embodiment of the method for forming 3D curved glass by using a mobile terminal according to the present invention, the profiling apparatus further includes: the first preheating module 210, the second preheating module 220, the third preheating module 230 and the fourth preheating module 240 are arranged in a flow line manner, the first hot pressing module 110 is positioned behind the fourth preheating module 240, and the 3D curved surface forming mold sequentially passes through the first preheating module 210, the second preheating module 220, the third preheating module 230 and the fourth preheating module 240 before passing through the first hot pressing module 110, and is used for heating the 3D curved surface forming mold in a heat conduction manner in stages.
Specifically, the first preheating module 210 includes a sub-cylinder 211, a sub-upper cooling plate 212, a sub-upper heating plate 213, a sub-lower heating plate 214, and a sub-lower cooling plate 215, the sub-cylinder 211 is vertically disposed, the sub-upper cooling plate 212, the sub-upper heating plate 213, the sub-lower heating plate 214, and the sub-lower cooling plate 215 are also disposed in the forming chamber 400, the sub-upper cooling plate 212 is connected to a lower end of the sub-cylinder 211, and the sub-upper heating plate 213 is connected below the sub-upper cooling plate 212.
When the 3D curved surface forming mold is preheated, the bottom surface of the sub upper heating plate 213 is used to contact with the top surface of the 3D curved surface forming mold, the top surface of the sub lower heating plate 214 is used to contact with the bottom surface of the 3D curved surface forming mold, and the sub lower heating plate 214 is connected to the sub lower cooling plate 215; the second preheating module 220 and the third preheating module 230 are configured by the same parts as the first preheating module 210, the fourth preheating module 240 is configured by the same parts as the first hot pressing module 110 to slow down the temperature rise speed of the 3D curved surface forming mold, and the fourth preheating module 240 replaces the main cylinder 111 by the auxiliary cylinder 211 to prevent excessive pressure from being applied to the 3D curved surface forming mold before formal hot pressing.
The 3D curved surface forming die and the plane glass blank need to be uniformly preheated before being pressed, and the 3D curved surface forming die and the plane glass blank can be controlled to be protected and heated through pressure maintaining. The preheating temperature of the first preheating module 210 is 650 ℃, and the output pressure is 4-15 kg; the preheating temperature of the second preheating module 220 is 750 ℃, and the output pressure is 4-15 kg; the preheating temperature of the third preheating module 230 is 850 ℃, and the output pressure is 4-15 kg; the preheating temperature of the fourth preheating module 240 is 950 ℃, and the output pressure is 4-20 kg; the preheating temperature of the 3D curved surface forming die is gradually preheated from low to high in sequence, and the 3D curved surface forming die and the plane glass blank are favorably and slowly heated.
Preferably, the secondary upper heating plate 213 and the secondary upper cooling plate 212 are connected by a plurality of spacers 216, and the secondary lower heating plate 214 and the secondary lower cooling plate 215 are connected by a plurality of spacers 217, the spacers 216 and 217 have a smaller contact area than the double-sided grid plates 116 and 117, and the spacers 216 and 217 increase the temperature rise speed of the 3D curved surface forming mold compared to the double-sided grid plates 116 and 117 during the preheating stage.
In a preferred embodiment of the method for forming 3D curved glass by using a mobile terminal of the present invention, the forming apparatus further comprises: the first cooling module 310 is located behind the third hot pressing module 130, and the 3D curved surface forming mold passes through the first cooling module 310, the second cooling module 320, the third cooling module 330 and the fourth cooling module 340 in sequence after passing through the third hot pressing module 130, and is used for cooling the 3D curved surface forming mold in stages in a heat conduction manner.
Preferably, the first cooling module 310 is configured with the same components as the first hot pressing module 130 to ensure a stable pressure maintaining effect on the 3D curved surface forming mold at the initial stage of cooling, and the second cooling module 320 is configured with the same components as the fourth preheating module 240 to increase the cooling speed of the 3D curved surface forming mold.
When the 3D curved surface forming mold passes through the first cooling module 310, the 3D curved surface forming mold is cooled by heat transfer with the main upper cooling plate and the main lower cooling plate in the first cooling module 310;
when the 3D curved surface forming mold passes through the second cooling module 320, the 3D curved surface forming mold is cooled by heat transfer with the auxiliary upper cooling plate and the auxiliary lower cooling plate in the second cooling module 320;
when the 3D curved surface forming die passes through the third cooling module 330 and the fourth cooling module 340, water cooling is performed through liquid cooling plates (the liquid cooling plates are liquid with a cooling effect, and preferably tap water in the invention) arranged in the third cooling module 330 and the fourth cooling module 340.
Specifically, a double-sided grid plate 116 is disposed between the main upper heating plate 113 and the main upper cooling plate 112 of the first cooling module 310, a double-sided grid plate 117 is disposed between the main lower heating plate 114 and the main lower cooling plate 115, a double-sided grid plate 216 is disposed between the auxiliary upper heating plate 213 and the auxiliary upper cooling plate 212 of the second cooling module 320, and a double-sided grid plate 217 is disposed between the auxiliary lower heating plate 214 and the auxiliary lower cooling plate 215.
As shown in fig. 3, the process of processing curved glass by the forming device of the invention comprises the following steps: placing a single-sheet plane glass blank in a 3D curved surface forming die in advance, then placing the 3D curved surface forming die with the single-sheet plane glass blank on a feeding port platform 1, after sensing the 3D curved surface forming die through a sensing device, pushing the 3D curved surface forming die into a forming chamber 400 through a cylinder control push rod, after the 3D curved surface forming die is sent into the forming chamber 400, heating the 3D curved surface forming die in a heat conduction mode in stages in sequence through a first preheating module 210, a second preheating module 220, a third preheating module 230 and a fourth preheating module 240 which are arranged in a flow line mode in advance, slowly preheating the single-sheet plane glass blank, and after preheating the 3D curved surface forming die is completed, performing hot-press forming on the single-sheet plane glass blank into a 3D curved surface glass product in stages through the first hot-press module 110, the second hot-press module 120 and the third hot-press module 130 which are arranged in the flow line mode in sequence (namely, the single-sheet Circular arc curved surfaces have appeared around the flat glass blank), work as 3D curved surface forming die is in the process behind third hot pressing module 130, loop through first cooling module 310, second cooling module 320, third cooling module 330 and the fourth cooling module 340 that are the assembly line form and arrange and cool off 3D curved surface forming die stage by stage with heat-conducting mode, reduce 3D curved surface forming die temperature gradually, work as after 3D curved surface forming die accomplishes quartic cooling, after rethread liquid cooling passageway 2 (auxiliary cooling device) carries out auxiliary cooling to 3D curved surface glass product after the shaping, accomplish the product ejection of compact through discharge gate 3.
A3D curved surface forming die is arranged below each station, the machining time of all the stations is consistent, and the display control console 4 (capable of displaying the temperature, pressure, machining time and other parameters of each preheating module, profiling module and cooling module) can be used for adjusting and controlling, so that the processing of the plane glass blanks in the 3D curved surface forming dies is facilitated, and the processing efficiency is improved.
It should be noted that, in practical application, according to actual needs and requirements of different products, the number of the profiling modules, the preheating module and the cooling module may not be the number of the present invention, only one profiling module may be provided in the present invention during profiling, and other profiling modules may be used as the preheating module or the cooling module, and the specific number is not limited.
In summary, the present invention discloses a method for forming curved glass of a mobile terminal, the method comprising: sending the 3D curved surface forming die with the single plane glass blank into a forming chamber; heating the 3D curved surface forming die in stages in a heat conduction mode sequentially through a plurality of preheating modules in advance; after preheating is finished, the single plane glass blank is hot-pressed and molded into a 3D curved glass product stage by stage through a plurality of hot-pressing modules; and after the profiling is finished, the 3D curved surface forming die is cooled stage by stage in a heat conduction mode sequentially through the plurality of cooling modules and the liquid cooling channels, and the product discharging is finished. According to the invention, the plurality of preheating modules, the plurality of hot pressing modules and the plurality of cooling modules which are arranged in a flow line form are adopted to carry out hot pressing stage by stage, so that the material internal stress in the 3D curved glass forming process is greatly reduced, the generation of fine cracks is reduced, the yield of the curved glass is obviously improved, the forming period of the curved glass is shortened, and the production efficiency is improved.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.

Claims (7)

1. A curved glass forming method for a mobile terminal is characterized by comprising the following steps:
step A, placing a 3D curved surface forming die with a single piece of flat glass blank on a feeding port platform, and controlling a feeding cylinder to send the 3D curved surface forming die into a forming chamber after a sensing device senses the 3D curved surface forming die;
step B, after the 3D curved surface forming die enters the forming chamber, heating the 3D curved surface forming die in a heat conduction mode in stages by a first preheating module, a second preheating module, a third preheating module and a fourth preheating module which are arranged in a flow line mode in advance;
step C, after the 3D curved surface forming die is preheated, the single plane glass blank is hot-pressed and formed into a 3D curved surface glass product stage by stage sequentially through a first hot-pressing module, a second hot-pressing module and a third hot-pressing module which are arranged in a flow line manner;
step D, after the 3D curved surface forming die passes through the third hot pressing die, the 3D curved surface forming die is cooled in stages in a heat conduction mode through a first cooling die set, a second cooling die set, a third cooling die set and a fourth cooling die set which are arranged in a flow line mode in sequence;
e, after the 3D curved surface forming die is cooled for four times, performing auxiliary cooling on the formed 3D curved surface glass product through a liquid cooling channel, and discharging the product;
the first hot-pressing module comprises a main cylinder, a main upper cooling plate, a main upper heating plate, a main lower heating plate and a main lower cooling plate, wherein the main cylinder is vertically arranged, the main upper cooling plate, the main upper heating plate, the main lower heating plate and the main lower cooling plate are all placed in a closed and air-exchangeable forming chamber, the main upper cooling plate is connected to the lower end of the main cylinder, and the main upper heating plate is connected to the lower part of the main upper cooling plate;
when the 3D curved surface forming die is subjected to hot press forming, the bottom surface of the main upper heating plate is used for being contacted with the top surface of the 3D curved surface forming die, the top surface of the main lower heating plate is used for being contacted with the bottom surface of the 3D curved surface forming die, and the main lower heating plate is connected onto the main lower cooling plate;
the second hot-pressing module and the third hot-pressing module are both configured by parts same as those of the first hot-pressing module; the fourth preheating module adopts the same part configuration as the first hot pressing module, and the auxiliary cylinder is used for replacing the main cylinder;
and double-sided grating plates are arranged between the main upper heating plate and the main upper cooling plate and between the main lower heating plate and the main lower cooling plate.
2. The method for forming curved glass of a mobile terminal according to claim 1, wherein the preheating temperature of the first preheating module is 650 degrees, and the output pressure is 4-15 kg; the preheating temperature of the second preheating module is 750 ℃, and the output pressure is 4-15 kg; the preheating temperature of the third preheating module is 850 ℃, and the output pressure is 4-15 kg; the preheating temperature of the fourth preheating module is 950 ℃, and the output pressure is 4-20 kg; the preheating temperature of the 3D curved surface forming die is gradually preheated from low to high in sequence.
3. The method for forming curved glass of a mobile terminal according to claim 2, wherein the first preheating module comprises a sub-cylinder, a sub-upper cooling plate, a sub-upper heating plate, a sub-lower heating plate, and a sub-lower cooling plate, the sub-cylinder is vertically disposed, the sub-upper cooling plate, the sub-upper heating plate, the sub-lower heating plate, and the sub-lower cooling plate are also disposed in the forming chamber, the sub-upper cooling plate is connected to a lower end of the sub-cylinder, and the sub-upper heating plate is connected to a lower portion of the sub-upper cooling plate;
when the 3D curved surface forming die is preheated, the bottom surface of the auxiliary upper heating plate is used for being contacted with the top surface of the 3D curved surface forming die, the top surface of the auxiliary lower heating plate is used for being contacted with the bottom surface of the 3D curved surface forming die, and the auxiliary lower heating plate is connected onto the auxiliary lower cooling plate; the second preheating module and the third preheating module are both configured by parts same as those of the first preheating module.
4. The method for forming curved glass of a mobile terminal according to claim 1, wherein the first, second and third hot pressing modules are all pressed at 950 degrees and output pressures of 0.001Mpa-0.8 Mpa.
5. The method for forming curved glass of a mobile terminal according to claim 1, wherein the first cooling module adopts the same component configuration as the first hot pressing module, and the second cooling module adopts the same component configuration as the fourth preheating module;
when the 3D curved surface forming die passes through the first cooling module, the 3D curved surface forming die is cooled by heat transfer with a main upper cooling plate and a main lower cooling plate in the first cooling module;
when the 3D curved surface forming die passes through the second cooling module, the 3D curved surface forming die is cooled by heat transfer with an auxiliary upper cooling plate and an auxiliary lower cooling plate in the second cooling module;
and when the 3D curved surface forming die passes through the third cooling module and the fourth cooling module, water cooling is carried out through the liquid cooling plate arranged in the third cooling module and the fourth cooling module.
6. The method for forming curved glass for mobile terminals according to claim 3, wherein the sub-upper heating plate and the sub-upper cooling plate and the sub-lower heating plate and the sub-lower cooling plate are connected by a plurality of spacers.
7. The method as claimed in claim 5, wherein a double-sided grid plate is disposed between the main upper heating plate and the main upper cooling plate, between the main lower heating plate and the main lower cooling plate of the first cooling module, between the auxiliary upper heating plate and the auxiliary upper cooling plate, and between the auxiliary lower heating plate and the auxiliary lower cooling plate of the second cooling module.
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CN109206000B (en) * 2017-07-03 2021-01-19 比亚迪股份有限公司 Curved glass and forming method thereof
CN107337338B (en) * 2017-08-30 2019-10-18 东莞恩特贝斯智能技术有限公司 A kind of selection forming method of 3D bend glass hot-press equipment
CN107473572B (en) * 2017-08-30 2019-09-20 东莞恩特贝斯智能技术有限公司 A kind of forming method of the Curred glass forming machine structure for mobile terminal
CN110372182A (en) * 2018-04-12 2019-10-25 蓝思科技(长沙)有限公司 A kind of 3D hot bending shape technique for glass screen production

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US4778507A (en) * 1986-08-12 1988-10-18 Asahi Glass Company Ltd. Method for bending glass plates
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CN106316081A (en) * 2016-08-31 2017-01-11 饶武良 Hot-bending forming machine for mobile phone glass and watch surface covers
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