CN114149169A - 5D curved surface glass hot bending forming manufacturing process - Google Patents
5D curved surface glass hot bending forming manufacturing process Download PDFInfo
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- CN114149169A CN114149169A CN202111313366.0A CN202111313366A CN114149169A CN 114149169 A CN114149169 A CN 114149169A CN 202111313366 A CN202111313366 A CN 202111313366A CN 114149169 A CN114149169 A CN 114149169A
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- glass
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- bent
- die
- hot bending
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- 239000011521 glass Substances 0.000 title claims abstract description 118
- 238000013003 hot bending Methods 0.000 title claims abstract description 97
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 239000005357 flat glass Substances 0.000 claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910002804 graphite Inorganic materials 0.000 claims description 5
- 239000010439 graphite Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 14
- 238000000465 moulding Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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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
-
- 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
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
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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)
Abstract
The invention relates to the field of glass hot bending processes, and discloses a 5D curved surface glass hot bending forming manufacturing process, which comprises the following steps: putting the flat glass into a one-step hot bending die, enabling the flat glass except the position A to be in contact with the one-step hot bending die, and enabling the middle of the flat glass to be pressed out of a groove along the second direction by the one-step hot bending die to obtain preliminary hot bent glass; the groove on the preliminary hot bending glass is the crater-shaped bulge, and the position A forms the side wall of the crater-shaped bulge; placing the preliminary hot bent glass into a two-step hot bending mold, wherein the shape of a middle cavity of the two-step hot bending mold is matched with that of the volcano-mouth-shaped bulge, so that the two-step hot bending mold can be in contact with the volcano-mouth-shaped bulge, the connecting part and the bent edge part in the preliminary hot bent glass, and the bent edge part of the preliminary hot bent glass is bent along a first direction to obtain the 5D curved glass; the control accuracy of the glass wall thickness and the surface profile can be improved.
Description
Technical Field
The invention relates to the field of glass hot bending processes, in particular to a 5D curved surface glass hot bending forming manufacturing process.
Background
The general process flow of glass hot bending in the prior art is as follows: the drawing and hot bending forming of two opposite-direction curved surfaces of the 5D curved surface glass is realized through one-time hot bending forming, so that the wall thickness drawing change of the hot-bent glass is caused, the precision fluctuation of the profile degree of the glass surface is large, and the precision required by customers is difficult to meet (for example, the required profile degree of the surface is less than or equal to +/-0.1 mm); fig. 2 is a schematic diagram of a mold structure for completing 5D curved glass hot bending by one-time hot bending, in the hot bending process, glass needs to be subjected to tensile forces in two opposite directions, the difficulty in controlling the wall thickness and the surface profile of the glass is high, in addition, the 2D state of the glass before the hot bending process is small in contact surface with the mold, the heat transfer is slow, the heating time of the glass needs to be prolonged, the forming efficiency is reduced, the heat transfer is uneven, and the wall thickness and the surface profile of the glass are difficult to control.
The 5D curved glass means that the four sides of the periphery of the glass are bent in one direction (3D), and the center is bent with a crater-like convex bulge, and the bending direction is opposite to the bending direction of the periphery of the glass, as shown in fig. 10.
Disclosure of Invention
In order to solve the technical problems, the invention provides a 5D curved glass hot bending forming manufacturing process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the 5D curved glass hot bending forming manufacturing process comprises the steps that the circumferential edge of 5D curved glass is bent along a first direction to form a bent edge portion, the middle portion of the 5D curved glass is bent along a second direction to form a crater-shaped bulge, and the connecting portion is used for connecting the bent edge portion and the crater-shaped bulge; the first direction is opposite to the second direction; the manufacturing process comprises the following steps:
the first step is as follows: putting the flat glass into a one-step hot bending die, enabling the flat glass except the position A to be in contact with the one-step hot bending die, and enabling the middle of the flat glass to be pressed out of a groove along the second direction by the one-step hot bending die to obtain preliminary hot bent glass; the groove on the preliminary hot bending glass is the crater-shaped bulge, and the position A forms the side wall of the crater-shaped bulge;
the second step is that: and placing the preliminary hot bent glass into a two-step hot bent mold, wherein the shape of a middle cavity of the two-step hot bent mold is matched with that of the volcano-mouth-shaped bulge, so that the two-step hot bent mold can be contacted with the volcano-mouth-shaped bulge, the connecting part and the bent edge part in the preliminary hot bent glass, and the bent edge part of the preliminary hot bent glass is bent along a first direction to obtain the 5D curved glass.
Further, the first hot bending die and the second hot bending die are graphite dies; the graphite mold has the advantages of high heat transfer speed, uniform heat transfer and easy processing, and is suitable for being used as a mold material for glass hot bending.
Further, the thickness of the 5D curved glass is greater than or equal to 0.4 mm; the manufacturing process is suitable for processing glass with all thicknesses, but the glass with the thickness less than 0.4mm has insufficient protection strength on electronic equipment, and the manufacturing process is more advantageous for processing thin glass with the thickness of 0.4 mm-1.1 mm.
When the one-step hot bending die and the two-step hot bending die are horizontally placed, the first direction is upward, and the second direction is downward;
the one-step hot bending die comprises a one-step upper die and a one-step lower die, wherein a first groove for placing plain glass is formed in the upper surface of the one-step lower die, a second groove is formed below the middle of the first groove, and a first bulge corresponding to the second groove is formed in the middle of the lower surface of the one-step upper die; the upper die moves downwards in one step, when the first bulge extends into the second groove, the flat glass is bent, part of the upper surface of the glass is in contact with each surface of the first bulge, and part of the lower surface of the glass is in contact with each surface of the second groove, so that the volcano-crater-shaped bulge is formed;
the two-step hot bending die comprises a two-step upper die and a two-step lower die, the middle part of the two-step upper die is the same as that of the one-step upper die in structure, and the middle part of the two-step lower die is the same as that of the one-step lower die in structure; the circumferential edge of the two-step upper die and the circumferential edge of the two-step lower die are both provided with upward-bent radians; when the preliminary hot-bending glass is placed into the two-step hot-bending mold, the first bulges of the two-step upper mold are in contact with the inner surfaces of the volcano-crater-shaped bulges, the non-circumferential edges and the non-first bulge parts of the two-step upper mold are in contact with the upper surfaces of the connecting parts, and the circumferential edges of the two-step lower mold are in contact with the lower surfaces of the bending edge parts of the preliminary hot-bending glass; and the two-step upper die moves downwards to enable the lower surface of the two-step upper die to be in contact with the upper surface of the glass and the upper surface of the two-step lower die to be in contact with the lower surface of the glass, so that the 5D curved glass is formed. The scheme provides a specific one-step hot bending die and two-step hot bending die structure.
Compared with the prior art, the invention has the beneficial technical effects that:
compared with a one-step forming process, the two-step forming process can improve the contact area between the mold and the glass and the contact uniformity between the mold and the glass in the two-step hot bending forming process, has higher and more uniform heat transfer speed, and is convenient to control the wall thickness and the surface profile of the glass; meanwhile, in the two-time forming process, only one-direction hot bending is carried out on the glass each time, and the control precision of the glass wall thickness and the surface profile degree can be improved.
Drawings
FIG. 1 is a schematic structural view of a two-step hot bending mold according to the present invention when closing the mold;
FIG. 2 is a schematic structural view of a prior art hot-bending die;
FIG. 3 is a schematic view of a flat sheet of glass;
FIG. 4 is a schematic view of the one-step hot-bending mold of the present invention in an unclamped configuration;
FIG. 5 is a schematic view of the one-step hot-bending mold of the present invention shown in an unclamped configuration;
FIG. 6 is a schematic structural view of the one-step hot bending mold of the present invention during mold closing;
FIG. 7 is a schematic view of the structure of the preliminary hot bending glass of the present invention;
FIG. 8 is a schematic view of the two-step hot-bending mold of the present invention shown in an unclamped configuration;
FIG. 9 is a schematic view of the two-step hot-bending mold of the present invention shown in an unclamped configuration;
FIG. 10 is a schematic structural view of a 5D curved glass according to the present invention;
FIG. 11 is a schematic structural view of the present invention for removing the sealing surface of the crater-like protrusions by CNC.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 10, the 5D curved glass 3 is a glass having a curved edge portion 13 curved in a first direction, a volcano-like projection 11 curved in a second direction at a central portion thereof, and a connecting portion 12 connecting the curved edge portion 13 and the volcano-like projection 11, the first direction being opposite to the second direction. In this embodiment, the hot-bending die is laid flat, with the first direction being the upward direction and the second direction being the downward direction.
As shown in fig. 2, when the glass is hot-bent by the hot-bending mold in the prior art, only the protrusion of the upper mold and the edge of the lower mold contact with the glass, the downward force F1 applied by the protrusion of the upper mold to the glass and the upward force F2 applied by the edge of the lower mold to the edge of the glass have small contact areas, which causes uneven heating and slow heat transfer of the glass to be hot-bent.
The 5D curved glass 3 hot bending forming manufacturing process uses a method of hot bending forming for two times; when the flat glass 1 is subjected to first hot bending forming, a one-step hot bending mold is used, a volcano-mouth-shaped bulge 11 is formed in the shape of the flat glass 1 along a second direction in a hot bending mode, in the embodiment, the 5D curved glass 3 is applied to a rear cover or a protective shell of a mobile phone, the volcano-mouth-shaped bulge 11 is used for placing devices such as a camera module and the like, and the sealing surface of the volcano-mouth-shaped bulge 11 needs to be removed through CNC equipment subsequently (the action can confirm whether the sealing surface needs to be removed according to design requirements); when the flat glass is put into the one-step hot bending die, the flat glass except the position A can be contacted with the surface of the one-step hot bending die; obtaining preliminary hot bending glass 2 after the first hot bending forming, wherein the side wall of the volcano-mouth-shaped bulge is formed at the position A; and cooling the preliminary hot-bent glass 2, and then using a two-step hot-bending mould to thermally bend the bent edge part 13 of the preliminary hot-bent glass 2 along the first direction to obtain the 5D curved glass 3.
The glass is amorphous, the glass is convenient to soften after reaching a certain temperature, and if the temperature of each part of the glass is different, the forming precision and the wall thickness of each part of the glass are influenced to stretch by different thicknesses when the glass is subjected to hot bending; compared with a one-step forming process, the two-step forming process can improve the contact area between the mold and the glass in the two-step hot bending forming process, has higher heat transfer speed and more uniform heat transfer, and is convenient to control the wall thickness and the surface profile of the glass; meanwhile, in the two-time forming process, only one-direction hot bending is carried out on the glass each time, and the control precision of the glass wall thickness and the surface profile degree can be improved.
And carrying out first hot bending molding by using the one-step hot bending mold, and carrying out second hot bending molding by using the two-step hot bending mold.
As shown in fig. 1 to 11, the one-step hot bending mold includes a one-step upper mold 20 and a one-step lower mold 21, wherein a first groove 211 for placing the flat glass 1 is formed in the upper surface of the one-step lower mold 21, a second groove 212 is formed below the middle of the first groove 211, and a first protrusion 201 corresponding to the second groove 212 is formed in the middle of the lower surface of the one-step upper mold 20; when the upper mold 20 is moved downward in one step to extend the first projection 201 into the second groove 212, the flat glass sheet 1 is bent so that part of the upper surface of the glass sheet is in contact with each surface of the first projection 201 and part of the lower surface is in contact with each surface of the second groove 212, thereby forming the crater-like projection 11. And after the first hot bending forming, taking out the obtained preliminary hot bending glass 2, cooling and shaping.
The two-step hot bending die comprises a two-step upper die 30 and a two-step lower die 31, wherein the middle part of the two-step upper die 30 is the same as the middle part of the one-step upper die 20 in structure, the middle part of the two-step lower die 31 is the same as the middle part of the one-step lower die 21 in structure, namely, a first groove 211 for placing the glass connecting part 12 is formed in the upper surface of the two-step lower die 31, a second groove 212 is formed below the middle part of the first groove 211, and a first bulge 201 corresponding to the second groove 212 is formed in the middle part of the lower surface of the one-step upper die 20; the circumferential edges of the two-step upper die 30 and the circumferential edges of the two-step lower die 31 have upward curved arcs 301 and 311. When the preliminary hot-bent glass 2 is placed into the two-step hot-bending mold, the first protrusion 201 of the two-step upper mold 30 is in contact with the inner surface of the crater-shaped protrusion 11, the non-circumferential edge and the non-first protrusion 201 of the two-step upper mold 30 are in contact with the upper surface of the connecting part 12, and the circumferential edge of the two-step lower mold 31 is in contact with the lower surface of the bent edge part 13 of the preliminary hot-bent glass 2; the two-step upper mold 30 moves downward, so that the lower surface of the two-step upper mold 30 is in contact with the upper surface of the glass, and the upper surface of the two-step lower mold 31 is in contact with the lower surface of the glass, and the 5D curved glass 3 is formed. The scheme provides a specific one-step hot bending die and two-step hot bending die structure.
The "central portion" of the present invention refers to the non-edge portion of each structure and is not limited to the geometric center of each structure.
In the present invention, there is a statement of "bent edge portion of preliminarily hot-bent glass" that there is a bent edge portion only on the 5D curved glass formed by the second hot-bending molding, and the bent edge portion of preliminarily hot-bent glass means a portion of glass to be hot-bent into a bent edge portion on the preliminarily hot-bent glass.
The one-step hot bending die and the two-step hot bending die in the embodiment adopt graphite dies, and the graphite dies are high in heat transfer speed, uniform in heat transfer, easy to process and suitable for being used as glass hot bending die materials.
The hot bending forming manufacturing process is suitable for hot bending forming of glass with various thicknesses, but the glass with the too small thickness has too low strength, and is not suitable for a rear cover and a protective shell of electronic equipment at present; in the embodiment, the glass with the thickness of more than 0.4mm is adopted, and compared with a one-time hot bending process, the hot bending forming manufacturing process can obviously improve the forming precision and can ensure that the surface profile is less than or equal to +/-0.1 mm; the invention has more obvious advantages when the glass with the thickness of 0.4 mm-1.1 mm is subjected to hot bending forming.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. The 5D curved glass hot bending forming manufacturing process comprises the steps that the circumferential edge of 5D curved glass is bent along a first direction to form a bent edge portion, the middle portion of the 5D curved glass is bent along a second direction to form a crater-shaped bulge, and the connecting portion is used for connecting the bent edge portion and the crater-shaped bulge; the first direction is opposite to the second direction; the manufacturing process comprises the following steps:
the first step is as follows: putting the flat glass into a one-step hot bending die, enabling the flat glass except the position A to be in contact with the one-step hot bending die, and enabling the middle of the flat glass to be pressed out of a groove along the second direction by the one-step hot bending die to obtain preliminary hot bent glass; the groove on the preliminary hot bending glass is the crater-shaped bulge, and the position A forms the side wall of the crater-shaped bulge;
the second step is that: and placing the preliminary hot bent glass into a two-step hot bent mold, wherein the shape of a middle cavity of the two-step hot bent mold is matched with that of the volcano-mouth-shaped bulge, so that the two-step hot bent mold can be contacted with the volcano-mouth-shaped bulge, the connecting part and the bent edge part in the preliminary hot bent glass, and the bent edge part of the preliminary hot bent glass is bent along a first direction to obtain the 5D curved glass.
2. The 5D curved glass hot bend forming manufacturing process according to claim 1, characterized in that: the first hot bending die and the second hot bending die are graphite dies.
3. The 5D curved glass hot bend forming manufacturing process according to claim 1, characterized in that: the thickness of the 5D curved glass is greater than or equal to 0.4 mm.
4. The 5D curved glass hot bend forming manufacturing process according to claim 1, characterized in that: when the one-step hot bending die and the two-step hot bending die are horizontally placed, the first direction is upward, and the second direction is downward;
the one-step hot bending die comprises a one-step upper die and a one-step lower die, wherein a first groove for placing plain glass is formed in the upper surface of the one-step lower die, a second groove is formed below the middle of the first groove, and a first bulge corresponding to the second groove is formed in the middle of the lower surface of the one-step upper die; the upper die moves downwards in one step, when the first bulge extends into the second groove, the flat glass is bent, part of the upper surface of the glass is in contact with each surface of the first bulge, and part of the lower surface of the glass is in contact with each surface of the second groove, so that the volcano-crater-shaped bulge is formed;
the two-step hot bending die comprises a two-step upper die and a two-step lower die, the middle part of the two-step upper die is the same as that of the one-step upper die in structure, and the middle part of the two-step lower die is the same as that of the one-step lower die in structure; the circumferential edge of the two-step upper die and the circumferential edge of the two-step lower die are both provided with upward-bent radians; when the preliminary hot-bending glass is placed into the two-step hot-bending mold, the first bulges of the two-step upper mold are in contact with the inner surfaces of the volcano-crater-shaped bulges, the non-circumferential edges and the non-first bulge parts of the two-step upper mold are in contact with the upper surfaces of the connecting parts, and the circumferential edges of the two-step lower mold are in contact with the lower surfaces of the bending edge parts of the preliminary hot-bending glass; and the two-step upper die moves downwards to enable the lower surface of the two-step upper die to be in contact with the upper surface of the glass and the upper surface of the two-step lower die to be in contact with the lower surface of the glass, so that the 5D curved glass is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111313366.0A CN114149169B (en) | 2021-11-08 | 2021-11-08 | Thermal bending forming manufacturing process for 5D curved glass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111313366.0A CN114149169B (en) | 2021-11-08 | 2021-11-08 | Thermal bending forming manufacturing process for 5D curved glass |
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| Publication Number | Publication Date |
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| CN114149169A true CN114149169A (en) | 2022-03-08 |
| CN114149169B CN114149169B (en) | 2024-03-29 |
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| WO2016098974A1 (en) * | 2014-12-19 | 2016-06-23 | 삼성전자 주식회사 | Device for molding glass curved surface and method for molding glass curved surface by using same |
| CN106746533A (en) * | 2017-03-03 | 2017-05-31 | 东莞恩特贝斯智能技术有限公司 | A kind of compression system of mobile terminal bend glass shaping |
| KR20180015548A (en) * | 2016-08-03 | 2018-02-13 | 미를 오토메이션 코포레이션 | Molding structure for manufacturing a molded glass part |
| CN207567108U (en) * | 2017-11-17 | 2018-07-03 | 蓝思科技（长沙）有限公司 | Hot bending die and glass bending preparation system |
| CN110255870A (en) * | 2019-06-27 | 2019-09-20 | Oppo广东移动通信有限公司 | The hot bending shape method of hot bending equipment and shell |
-
2021
- 2021-11-08 CN CN202111313366.0A patent/CN114149169B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005097105A (en) * | 2003-09-25 | 2005-04-14 | Schott Ag | Process for fabricating glass/glass-ceramic plate on which widened facet is formed and glass/glass-ceramic plate with widened facet |
| WO2016098974A1 (en) * | 2014-12-19 | 2016-06-23 | 삼성전자 주식회사 | Device for molding glass curved surface and method for molding glass curved surface by using same |
| KR20180015548A (en) * | 2016-08-03 | 2018-02-13 | 미를 오토메이션 코포레이션 | Molding structure for manufacturing a molded glass part |
| CN106746533A (en) * | 2017-03-03 | 2017-05-31 | 东莞恩特贝斯智能技术有限公司 | A kind of compression system of mobile terminal bend glass shaping |
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| CN114149169B (en) | 2024-03-29 |
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