CN109437525B - Mobile phone curved surface glass hot bending composite die with temperature regulation and control method - Google Patents
Mobile phone curved surface glass hot bending composite die with temperature regulation and control method Download PDFInfo
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- CN109437525B CN109437525B CN201811637146.1A CN201811637146A CN109437525B CN 109437525 B CN109437525 B CN 109437525B CN 201811637146 A CN201811637146 A CN 201811637146A CN 109437525 B CN109437525 B CN 109437525B
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- 239000011521 glass Substances 0.000 title claims abstract description 54
- 238000013003 hot bending Methods 0.000 title claims abstract description 35
- 239000002131 composite material Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 57
- 239000002184 metal Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims description 88
- 230000008569 process Effects 0.000 claims description 24
- 238000000465 moulding Methods 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 238000000748 compression moulding Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
A mobile phone curved surface glass hot bending composite die with temperature regulation and control functions comprises a die and a bottom die, wherein a cavity is formed in the bottom die, grooves are formed in two sides of the die respectively, bosses meshed with the grooves are formed in two sides of the bottom die, edges of the grooves and the bosses are identical curved surfaces, a die curved surface is arranged in the center of the die, a cavity curved surface is formed in the cavity, the die curved surface and a surface curved surface of the cavity are curved surfaces with identical curvature, when the die is pressed with the bottom die, the bosses are inserted into the grooves and the surfaces of the bosses are attached to the surfaces of the grooves, the die curved surface is pressed to the cavity curved surface, metal heating pipes are respectively arranged in the bottom die opposite to the cavity curved surface area and the die curved surface area, and the metal heating pipes are connected with a temperature controller after being connected with a power supply through wires. The invention improves the precision of glass bending, ensures the consistency of glass during bending and improves the quality of products.
Description
Technical Field
The invention belongs to the technical field of molds, and particularly relates to a mobile phone curved glass hot bending composite mold with temperature regulation and control and a control method.
Background
Curved surface screen cell-phones are popular today more and more, and the outer screen of curved surface screen cell-phone is mostly 2.5D, 3D's curved surface glass, and its main advantage is that have better visual experience, and the feel is more comfortable when using, has further increased the usable floor area of cell-phone screen. The die of the curved screen mobile phone glass mainly comprises a bottom die and a pressing die, wherein the bottom die is concave, the pressing die is provided with a boss, and a gap with the thickness of the mobile phone screen is just reserved when the bottom die is meshed with the pressing die, and the gap is about 3 mm. The plate glass is placed in the groove of the bottom film, the glass is slightly larger than the width of the groove, so that the glass can not fall, when the glass is bent by heating, the glass is softened by heating, the pressing die is contacted with the glass, the edge of the glass is bent, the pressing die is attached to the lower surface of the groove of the bottom die, and the mobile phone glass is bent by pressing. The existing glass hot bending die mainly has the following defects: 1. the bottom die and the pressing die cannot be aligned accurately, the pressing die is easy to deviate when being pressurized, the positioning precision is poor, and the deviation cannot be adjusted in the heating process, so that the bending precision of the mobile phone glass is poor. 2. The detected temperature is the temperature of the heating plate, not the internal temperature of the press mold, and the detected temperature is inaccurate. 3. When the temperature in the cavity is inconsistent with the designed temperature, the temperature of the glass in the cavity is difficult to accurately control through the heating of the outer heating plate, so that the heating efficiency is lower, and the energy conservation and the environmental protection are not realized. 4. The groove of the lower template is utilized to directly bend the planar glass, so that the bending stress of the glass edge is larger, and cracks and bubbles are easy to generate.
Disclosure of Invention
The invention aims to solve the technical problem of providing the curved glass hot bending composite die with the temperature regulation and control function for the mobile phone, which improves the bending precision of glass, ensures the consistency of glass during bending and improves the product quality.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a take cell-phone curved surface glass hot bending compound die of temperature regulation and control, includes moulding die and die block, is equipped with the die cavity in the die block, the both sides of moulding die are equipped with the recess respectively, the both sides of die block are equipped with the boss that meshes with the recess, the border of recess and boss is the same curved surface, the moulding die center is equipped with the moulding die curved surface, be equipped with the die cavity curved surface in the die cavity, the surface of moulding die curved surface and die cavity is the curved surface that has the same camber, during moulding die and die block pressfitting, the boss inserts in the recess and the surface laminating of boss and the surface of recess, the moulding die curved surface is pressed towards the die cavity curved surface, be equipped with the metal heating pipe in the die block respectively towards die cavity curved surface region and moulding die curved surface region, the metal heating pipe is connected with the temperature controller after being connected through wire and power.
The two sides of the curved surface of the cavity are respectively provided with a rotating block with a rotating range of 90 degrees through a pin shaft, the rotating blocks are provided with curved surface sections, cambered surface sections and plane sections, the curved surface sections are blocked and limited by the curved surface side of the cavity and are contacted with the curved surface side of the cavity when the rotating blocks are in a vertical state, the plane sections are contacted with the bottom surface of the cavity, the cambered surface sections are used for connecting the curved surface sections and the plane sections, the distance between the two rotating blocks is equal to the width of a workpiece to be processed, and the length of the rotating blocks is equal to the length of the workpiece to be processed.
The spring is characterized in that a baffle plate is further arranged between the rotating block and the side wall of the cavity, a spring is arranged between the baffle plate and the side wall of the cavity, mounting holes are formed in the baffle plate and the side wall of the cavity respectively, two ends of the spring are respectively connected with the mounting holes of the baffle plate and the mounting holes of the side wall of the cavity in a mounting mode, and when the spring is in a natural state, the stop block abuts against the rotating block to enable the rotating block to be in a vertical 90-degree state.
And wireless temperature sensors connected with the temperature controller are respectively arranged in the areas where the cavity curved surface and the compression mold curved surface are located.
The pressing die is internally provided with a sliding block, the sliding block is internally provided with a middle groove for clamping the baffle, the width of the middle groove is equal to the thickness of the baffle, two sides of the sliding block are respectively provided with a bulge for preventing the baffle from sliding out of the middle groove, the curvature of the end face of the sliding block is identical to that of the curved surface of the pressing die, and when the sliding block moves to the outermost side, the end face of the sliding block and the curved surface of the pressing die form a complete combined curved surface with the same curvature.
And a sliding groove for sliding the sliding block is also arranged in the pressing die.
The height of the boss is 10mm less than the depth of the groove.
One side of the pressing die and one side of the bottom die are respectively provided with the same direction identification piece.
The bottom die and the pressing die are flake graphite die bodies, a groove cavity is formed in the bottom surface of the bottom die, and vent holes are formed in the bottom die and the pressing die.
A control method of a curved glass hot bending composite die of a mobile phone with temperature regulation and control comprises the following steps:
firstly, placing the workpiece on two rotating blocks, butting the edges of the two sides of the workpiece with the edges of the rotating blocks, placing and combining a pressing die and a bottom die, preheating the inside of the pressing die and the inside of the bottom die by an external heating source, and stopping heating when the temperature reaches a set value;
detecting the temperatures of the curved surface of the pressing die and the curved surface of the cavity in real time through a wireless temperature sensor, controlling the metal heating pipe to perform secondary heating if the detected temperature is lower than a set value, stopping heating of the metal heating pipe if the detected temperature is higher than the set value, and keeping the temperature at the set value to soften the workpiece by heating;
under the set pressure, the pressing die is controlled to be continuously pressed to the bottom die, the rotating block is extruded to push the baffle plate to move towards the side wall of the die cavity, the spring is compressed until the boss on the bottom die is completely pressed into the groove of the pressing die, the pressing die stops moving, the pressing process is completed, the pressure is maintained for a set time, cooling and forming are carried out, and the hot bending operation of the workpiece is completed.
When the preheating temperature is raised, at least two sections of temperature rise are adopted, the first section of temperature rise is raised to a first section of set temperature from an initial temperature at a constant speed temperature value, and then is raised to a second section of set temperature from the first section of set temperature value at a constant speed temperature value until the temperature rise of all sections is completed;
in the hot bending process of pressing the pressing die to the bottom die, pressing and hot bending operations are carried out according to the set pressure, pressing die temperature and bottom die temperature in each section of forming process, pressing die temperature and bottom die temperature of each section of forming are respectively reduced in sequence, pressure maintaining treatment is carried out according to the set time finally, then cooling is carried out to form a workpiece, and the hot bending process is finished.
The invention is mainly used for the hot bending processing of a curved glass screen of a mobile phone or a mobile phone shell, and the process that the bottom die gradually bends the mobile phone glass is a process that the rotating block is gradually contacted with the glass, so that the glass is prevented from being cracked or damaged due to sudden bending when the temperature is insufficient, when the rotating block rotates by 90 degrees, one side edge of the rotating block is just horizontal, meanwhile, the sliding block also moves to two sides, the hot pressing bending is finished, the sliding distance of the sliding block of the pressing die is the same as the moving distance of the baffle, the moving distance of the sliding block is the same as the moving distance of the rotating block, the consistency of bending the glass is ensured, and the bending precision is enhanced.
In addition, the temperature in the cavity can be accurately measured, the metal heating pipe is used for secondary heating, and when the temperature of the outer heating source reaches the required temperature and the temperature of the inner cavity does not reach the temperature requirement, the automatic control system can be used for controlling the temperature. The temperature precision is improved, and the generation of defective products is effectively reduced.
Drawings
FIG. 1 is a schematic view of a three-dimensional structure of a stamper of the present invention;
FIG. 2 is a schematic view of the three-dimensional structure of the bottom mold of the present invention;
FIG. 3 is a schematic view of the three-dimensional structure of the inside of the bottom mold of the present invention;
FIG. 4 is a bottom view of the stamper of the present invention;
FIG. 5 is a top view of the bottom mold of the present invention;
FIG. 6 is a schematic cross-sectional view of the initial bending of the die of the present invention;
FIG. 7 is a schematic cross-sectional view of the end bend of the die of the present invention;
FIG. 8 is a schematic cross-sectional view of the bottom mold of the present invention showing the initial bending;
FIG. 9 is a schematic cross-sectional view of the end bend of the bottom die of the present invention;
FIG. 10 is a schematic view of the overall hot-bending initiation section of the present invention;
FIG. 11 is a schematic view of the overall hot-end section of the present invention;
FIG. 12 is a schematic flow chart of the temperature control of the present invention.
Detailed Description
The invention will be further described in detail with reference to the drawings and the detailed description below, in order to further understand the features and technical means of the invention and the specific objects and functions achieved.
As shown in fig. 1-8, the invention discloses a mobile phone curved surface glass hot bending composite mold with temperature regulation and control, which comprises a pressing mold 1 and a bottom mold 2, wherein a cavity 24 is arranged in the bottom mold 2, grooves 3 are respectively arranged on two sides of the pressing mold 1, bosses 4 meshed with the grooves 3 are arranged on two sides of the bottom mold 2, edges of the grooves 3 and the bosses 4 are the same curved surfaces, a pressing mold curved surface 18 is arranged at the center of the pressing mold 1, a cavity curved surface 25 is arranged in the cavity 24, the pressing mold curved surface 18 and the cavity curved surface 25 are curved surfaces with the same curvature, when the pressing mold 1 and the bottom mold 2 are pressed, the bosses 4 are inserted into the grooves 3, the surfaces of the bosses are attached to the surfaces of the grooves, the pressing mold curved surface 18 is pressed against the cavity curved surface 25, a metal heating pipe 8 is arranged in the area facing the cavity curved surface 25, and a metal heating pipe 19 is arranged in the pressing mold and is connected with a temperature controller through a wire after being connected with a power supply. The boss 4 is inserted into the groove 3 to limit the stroke between the pressing die and the bottom die, and the boss is ensured not to deviate, and the assistance of external devices is not needed, so that the production cost is effectively saved. The temperature controller can realize on-off control of a power supply through the connecting relay, and can realize control on whether the metal heating pipe is heated or not. The metal heating pipe is preferably of a U-shaped seamless structure. The height of the boss is 10mm less than the depth of the groove. The metal heating pipes arranged in the bottom die and the pressing die are closer to the surface of the workpiece to compensate the temperature difference when the temperature does not reach the requirement, or the inside of the cavity is insulated when the temperature is required to be constant.
In addition, the two sides of the cavity curved surface 25 are respectively rotatably provided with a rotating block 5 with a rotating range of 90 degrees through a pin shaft, the rotating block 5 can freely rotate, the rotating block 5 is provided with a curved surface section, a cambered surface section and a plane section, the side edge of the curved surface of the cavity blocks the limiting side edge of the curved surface of the cavity when the rotating block is in a vertical state, the curved surface section is contacted with the side edge of the curved surface of the cavity, the plane section is contacted with the bottom surface of the cavity, the cambered surface section is used for connecting the curved surface section and the plane section, the distance between the two rotating blocks is equal to the width of a workpiece to be processed, and the length of the rotating block is equal to the length of the workpiece to be processed. When the rotating blocks are in an initial vertical state, the workpiece is placed on the two rotating blocks, and the edges of the two sides of the workpiece are just butted with the edges of the rotating blocks. The curvature of the curved surface section of the rotating block is the same as that of the workpiece, and the mobile phone screen with different types, namely, the rotating blocks with different curvatures, can be replaced to bend the mobile phone screen with different curvatures according to different requirements, so that the mobile phone screen meets the development concept of energy conservation and environmental protection, and meets the flexible design.
In order to ensure the use flexibility of the rotating block 5, a baffle plate is further arranged between the rotating block 5 and the side wall of the cavity 24, the left rotating block is correspondingly connected with the baffle plate 16, the right rotating block is correspondingly connected with the baffle plate 9, a spring 10 is arranged between the baffle plate and the side wall of the cavity, mounting holes 20 are respectively formed in the baffle plate and the side wall of the cavity, two ends of the spring are respectively connected with the mounting holes of the baffle plate and the mounting holes of the side wall of the cavity in a mounting mode, and when the spring is in a natural state, the baffle plate abuts against the rotating block to enable the rotating block to be in a vertical 90-degree state. By means of the arrangement of the springs, when the pressing die presses the bottom die, the rotating block can be extruded to rotate towards the side wall of the die cavity, namely, the rotating block rotates anticlockwise, so that the baffle is driven to move to form extrusion compression on the springs, when the pressing die is removed, the baffle is driven to move towards the center of the die cavity by the restoring elasticity of the springs, and the rotating block is driven to rotate clockwise until the initial state is restored.
The wireless temperature sensors connected with the temperature controllers are respectively arranged in the areas of the cavity curved surface 25 and the press mold curved surface 18, the wireless temperature sensors are wireless thermocouples, the temperature in the range of 0-800 ℃ can be accurately measured, the precision is 1 ℃, the response time is 3s, and the temperature of the glass surface can be accurately measured by arranging the wireless temperature sensors at the positions close to the distance from the workpiece.
In this embodiment, the wireless temperature sensor 6 in the area of the cavity curved surface 25 is provided on the rotating block 5, so that the temperature of the workpiece can be measured more closely. The wireless temperature sensor 15 is arranged on the curved surface 18 of the pressing die, the wireless temperature sensor 6 and the wireless temperature sensor 15 are always in contact with air in the die, the temperature in the die can be accurately measured, the temperature is transmitted to the temperature controller, the temperature controller determines the opening and closing of the two metal heating pipes 8 and the metal heating pipe 19 according to the temperature obtained in the temperature receiver, the die is secondarily heated to ensure the accuracy of bending temperature, the accuracy of temperature is improved, the generation probability of bubbles and glass cracks is reduced, the yield is improved to more than 95% from the previous 80%, and the working efficiency is greatly improved. The bottom die and the pressing die are used for heating simultaneously, so that the workpiece is heated uniformly, and pits, bubbles or pits can not occur.
The inside of the pressing mold 1 is also provided with a sliding block 14, the sliding block 14 is internally provided with a middle groove 21 for clamping the baffle, the width of the middle groove 21 is equal to the thickness of the baffle, for example, the baffle of the middle groove can be set to be 5mm, two sides of the sliding block 14 are respectively provided with a bulge 26 for preventing the baffle from sliding out of the middle groove 21, the curvature of the end face of the sliding block 14 is the same as that of the curved surface of the pressing mold, and the end face of the sliding block and the curved surface of the pressing mold form a complete combined curved surface with the same curvature when the sliding block moves to the outermost side. The compression mold is also internally provided with an arc-shaped chute for sliding the sliding block, and the sliding block can slide along the chute. When the pressing die is pressed towards the bottom die, the baffle plate is inserted into the middle groove of the sliding block, and two protrusions 26 are arranged on two sides of the sliding block 14, so that the baffle plate is limited to slide out of the middle groove 21. The baffle plate 9 pushes the slide block 14 to slide towards the side wall of the die cavity until the slide block 14 is completely removed, and because the curvatures of the lower surface of the slide block 14 and the curved surface 18 of the die are the same, the lower surface of the slide block 14 is just connected with the curved surface 18 of the die when the slide block is completely removed, and the lower surfaces of the curved surfaces of the two slide blocks and the curved surface 18 of the die form a complete combined curved surface with the same curvature. The high-temperature-resistant compression spring material is GH4145, has good corrosion resistance and oxidation resistance at the temperature of below 980 ℃, and has higher strength at the temperature of below 800 ℃.
Taking one side as an example for illustration, in the process of pressing downwards, the rotating block 5, the sliding block 14 and the baffle plate 9 move in the same direction, the offset of the rotating block 5, the sliding block 14 and the baffle plate 9 are kept the same all the time under the action of the spring and the sliding groove, when the upper surface of the boss 4 is contacted with the bottom surface of the groove 3, the sliding block 14 slides to the leftmost side from the right side, the rotating block 5 also rotates anticlockwise by 90 degrees, the pressing mold cannot move continuously because the upper surface of the boss 4 is contacted with the bottom surface of the groove 3, and glass hot bending is finished. The above description is made by taking one side of the sliding blocks, the rotating blocks and the baffle plate as an example, the sliding directions of the sliding blocks at two sides are opposite, and the rotating directions of the rotating blocks at two sides of the curved surface of the cavity are opposite and symmetrical, so that detailed description is omitted.
The same direction mark piece 27 is respectively arranged on one side of the pressing die and one side of the bottom die, the direction mark piece can be a round hole formed in the same side of the pressing die and the bottom die, when the pressing die and the bottom die are placed, the combination of the pressing die and the bottom die can be realized by only identifying the position of the round hole and placing the sides of the round hole together, and the error can be avoided. The hot bending processing after the influence is relieved in the direction of the pressing die 1 and the bottom die 2 is effectively prevented, meanwhile, the direction of the glass is convenient to observe and distinguish in the pressing bending process, and the judgment is made in time when the problem is solved.
The bottom die and the pressing die are both flake graphite die bodies, the heat conduction is better, the inner cavity of the bottom die is provided with vent holes with the width of 5mm and the depth of 3mm, so that gas in the die can be discharged in the extrusion process, the lower surface of the bottom die is provided with a groove cavity 12 with the width of 5mm and the depth of 2mm, the length of the groove cavity penetrates through the lower surface of the whole bottom die, and the angle is 45 degrees with the horizontal direction. Air in the die is discharged through the exhaust hole after being extruded, and meanwhile, the exhaust hole is convenient for nitrogen to enter as protective gas in the processing process, so that the die or glass is prevented from being oxidized by air at high temperature, the service life of the die is prolonged, and the yield is also improved. The groove cavity 12 can further increase the heat transfer speed of the lower heating plate, avoid the insufficient local heating to lead the glass to generate cracks, improve the yield from 80% to more than 95% at present and greatly improve the working efficiency.
When the mobile phone bending screen with different curvatures is required to be processed by the die, the glass hot bending operation can be performed after the installation is completed according to the same working flow by only replacing the rotating block 5 with different curvatures and simultaneously replacing the matched insert slide block 14 with the same curvatures under the condition that the main body die is unchanged, namely the pressing die 1 and the bottom die 2 are unchanged.
In addition, the invention also discloses a control method of the curved glass hot bending composite die with the temperature regulation and control function, which comprises the following steps:
firstly, placing the workpiece on two rotating blocks, butting the edges of the two sides of the workpiece with the edges of the rotating blocks, placing and combining the pressing die and the bottom die, preheating and heating the inside of the pressing die and the bottom die through an external heating source, and stopping heating after the temperature reaches a set value.
And detecting the temperatures of the curved surface of the pressing die and the curved surface of the cavity in real time through a wireless temperature sensor, controlling the metal heating pipe to perform secondary heating if the detected temperature is lower than a set value, stopping heating of the metal heating pipe if the detected temperature is higher than the set value, and keeping the temperature at the set value to soften the workpiece by heating.
Under the set pressure, the pressing die is controlled to be continuously pressed to the bottom die, the rotating block is extruded to push the baffle plate to move towards the side wall of the die cavity, the spring is compressed until the boss on the bottom die is completely pressed into the groove of the pressing die, the pressing die stops moving, the pressing process is completed, the pressure is maintained for a set time, cooling and forming are carried out, and the hot bending operation of the workpiece is completed.
When the preheating temperature is raised, at least two sections of temperature rise are adopted, the first section of temperature rise is raised to a first section of set temperature from an initial temperature at a constant speed temperature value, and then is raised to a second section of set temperature from the first section of set temperature value at a constant speed temperature value until the temperature rise of all sections is completed;
in the hot bending process of pressing the pressing die to the bottom die, pressing and hot bending operations are carried out according to the set pressure, pressing die temperature and bottom die temperature in each section of forming process, pressing die temperature and bottom die temperature of each section of forming are respectively reduced in sequence, pressure maintaining treatment is carried out according to the set time finally, then cooling is carried out to form a workpiece, and the hot bending process is finished.
Specifically, after the installation is completed, the mold is preheated by gradually increasing the temperature in the bending process, the preheating is generally performed by three times of heating, the glass is prevented from being damaged by suddenly increasing to a higher temperature once, the temperature is gradually increased, the temperature of the final preheating is 810 ℃ of the pressing mold, 795 ℃ of the bottom mold, and the glass is not crystalline, so that the glass has no fixed melting point but has a softening point, and the glass is completely softened at the moment and can be bent and pressurized.
Then starting a molding step, wherein the first pressure of molding is 0.5Mpa, the molding temperature is 795 ℃, and the bottom die temperature is 780 ℃; the pressure of the second molding is 0.5Mpa, the molding temperature is 774 ℃, the bottom die temperature is 765 ℃, then the molding process enters a pressure maintaining stage, the pressure is 0.55Mpa, the time is 67s, then the molding process is gradually cooled, and the glass is heated and bent to be molded, and the heating and bending process is finished.
Air in the die is discharged through the exhaust hole 11 after being extruded, meanwhile, the exhaust hole 11 also facilitates the entry of nitrogen as protective gas in the processing process, the die or glass is prevented from being oxidized by air under the condition of high temperature, the service life of the die is prolonged, and the yield is also improved. The groove cavity 12 on the lower surface of the bottom die can further increase the heat transfer speed of the lower heating plate, avoid the phenomenon that the glass is cracked due to insufficient local heating, improve the yield from 80% to more than 95% at present, and greatly improve the working efficiency.
It should be noted that, the foregoing is only a preferred embodiment of the present invention, and the present invention is not limited to the foregoing embodiment, but it should be understood that although the present invention has been described in detail with reference to the embodiment, it is possible for those skilled in the art to make modifications to the technical solutions described in the foregoing embodiment, or to make equivalent substitutions for some technical features thereof, but any modifications, equivalent substitutions, improvements and the like within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a take cell-phone curved surface glass hot bending compound die of temperature regulation and control, including moulding die and die block, be equipped with the die cavity in the die block, characterized by that, the both sides of die block are equipped with the recess respectively, the both sides of die block are equipped with the boss that meshes with the recess, the border of recess and boss is the same curved surface, the moulding die curved surface is equipped with the moulding die curved surface in the die cavity, the moulding die curved surface is the curved surface that has the same camber with the surface curved surface of die cavity, during moulding die and die block pressfitting, the boss inserts in the recess and the surface laminating of boss, the moulding die curved surface presses against the die cavity curved surface, be equipped with metal heating pipe in the die block facing to die cavity curved surface region and die cavity curved surface region respectively, metal heating pipe is connected with the temperature controller after passing through the wire, the both sides of die cavity curved surface still rotate through the round pin axle respectively and install a rotation limit that the rotation range is 90 degrees, the rotation block has curved surface section, curved surface section and planar section contact with the die cavity curved surface side, planar section contact with the cavity bottom surface, curved surface section and planar section, the distance between two rotation blocks equals the width of waiting to process work piece, the length of work piece is equal to the rotation of rotation block; the bottom die and the pressing die are flake graphite die bodies, a groove cavity is formed in the bottom surface of the bottom die, and vent holes are formed in the bottom die and the pressing die.
2. The curved glass hot bending composite die with the temperature regulation and control function for the mobile phone is characterized in that a baffle plate is further arranged between the rotating block and the side wall of the cavity, a spring is arranged between the baffle plate and the side wall of the cavity, mounting holes are respectively formed in the baffle plate and the side wall of the cavity, two ends of the spring are respectively connected with the mounting holes of the baffle plate and the mounting holes of the side wall of the cavity in a mounting mode, and when the spring is in a natural state, the baffle plate abuts against the rotating block to enable the rotating block to be in a vertical 90-degree state.
3. The mobile phone curved glass hot bending composite die with temperature regulation and control according to claim 2, wherein wireless temperature sensors connected with a temperature controller are respectively arranged in the areas where the cavity curved surface and the compression molding curved surface are located.
4. The curved glass hot bending composite die with the temperature control function for the mobile phone is characterized in that a sliding block is further arranged in the pressing die, a middle groove for clamping the baffle is formed in the sliding block, the width of the middle groove is equal to the thickness of the baffle, a bulge for preventing the baffle from sliding out of the middle groove is respectively formed on two sides of the sliding block, the curvature of the end face of the sliding block is identical to that of the curved surface of the pressing die, and the end face of the sliding block and the curved surface of the pressing die form a complete combined curved surface with the same curvature when the sliding block moves to the outermost side.
5. The curved glass hot bending composite die with the temperature control for the mobile phone according to claim 4, wherein a sliding groove for sliding a sliding block is further arranged in the pressing die.
6. The curved glass hot bending composite mold with temperature control for a mobile phone according to claim 5, wherein one side of the pressing mold and one side of the bottom mold are respectively provided with the same direction identification piece.
7. A control method of a curved glass hot bending composite mold with temperature regulation for a mobile phone according to claim 6, comprising the following steps:
firstly, placing a workpiece on two rotating blocks, butting the edges of the two sides of the workpiece with the edges of the rotating blocks, placing and combining a pressing die and a bottom die, preheating and heating the inside of the pressing die and the inside of the bottom die through an external heating source, and stopping heating after the temperature reaches a set value;
detecting the temperatures of the curved surface of the pressing die and the curved surface of the cavity in real time through a wireless temperature sensor, controlling the metal heating pipe to perform secondary heating if the detected temperature is lower than a set value, stopping heating of the metal heating pipe if the detected temperature is higher than the set value, and keeping the temperature at the set value to soften the workpiece by heating;
under the set pressure, the pressing die is controlled to be continuously pressed to the bottom die, the rotating block is extruded to push the baffle plate to move towards the side wall of the die cavity, the spring is compressed until the boss on the bottom die is completely pressed into the groove of the pressing die, the pressing die stops moving, the pressing process is completed, the pressure is maintained for a set time, cooling and forming are carried out, and the hot bending operation of the workpiece is completed.
8. The method for controlling the curved glass hot bending composite mold with temperature regulation and control for the mobile phone according to claim 7, wherein at least two sections of heating are adopted during preheating and heating, the first section of heating is increased from an initial temperature to a first section of set temperature at a constant speed temperature value, and then is increased from the first section of set temperature value to a second section of set temperature at a constant speed temperature value until the heating of all sections is completed;
in the hot bending process of pressing the pressing die to the bottom die, pressing and hot bending operations are carried out according to the set pressure, pressing die temperature and bottom die temperature in each section of forming process, pressing die temperature and bottom die temperature of each section of forming are respectively reduced in sequence, pressure maintaining treatment is carried out according to the set time finally, then cooling is carried out to form a workpiece, and the hot bending process is finished.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110240394B (en) * | 2019-07-05 | 2022-04-26 | 广东华中科技大学工业技术研究院 | Ultrasonic-assisted glass hot bending device based on millimeter wave heat source and control method |
| CN110687941B (en) * | 2019-08-15 | 2021-07-30 | 广东华中科技大学工业技术研究院 | System and method for synchronously controlling temperatures of upper die and lower die of 3D cover plate glass |
| CN111099813A (en) * | 2019-12-30 | 2020-05-05 | 富泰华精密电子（郑州）有限公司 | Hot press molding method |
| CN111268895B (en) * | 2020-02-13 | 2022-06-28 | 广东华中科技大学工业技术研究院 | Glass hot bending device and method based on laser shaping and orientation assistance |
| CN113829614B (en) * | 2021-10-29 | 2022-10-25 | 江苏雅驹新材料实业有限公司 | Curved surface forming device based on full-color display screen production |
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