CN114149169B - Thermal bending forming manufacturing process for 5D curved glass - Google Patents
Thermal bending forming manufacturing process for 5D curved glass Download PDFInfo
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- CN114149169B CN114149169B CN202111313366.0A CN202111313366A CN114149169B CN 114149169 B CN114149169 B CN 114149169B CN 202111313366 A CN202111313366 A CN 202111313366A CN 114149169 B CN114149169 B CN 114149169B
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- crater
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- 239000011521 glass Substances 0.000 title claims abstract description 113
- 238000005452 bending Methods 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000013003 hot bending Methods 0.000 claims abstract description 108
- 239000005357 flat glass Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 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
- 238000010586 diagram Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 glass hot bending forming manufacturing process, which comprises the following steps: placing the flat glass into a one-step hot bending die, enabling the flat glass to be in contact with the one-step hot bending die except the position A, and extruding the middle part of the flat glass into a groove along a second direction by the one-step hot bending die to obtain preliminary hot bending glass; the groove on the preliminary hot bent glass is the crater-shaped bulge, and the position A forms the side wall of the crater-shaped bulge; placing the preliminary hot-bending glass into a two-step hot-bending die, wherein the shape of the middle cavity of the two-step hot-bending die is matched with the shape of the crater-shaped bulge, so that the two-step hot-bending die can be contacted with the crater-shaped bulge, the connecting part and the bending edge part in the preliminary hot-bending glass, and bending the bending edge part of the preliminary hot-bending glass 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 glass hot bending forming manufacturing process.
Background
The common technological process of glass hot bending in the prior art comprises the following steps: the stretching hot bending forming of two opposite curved surfaces of the 5D curved surface glass is realized through one-time hot bending forming, so that the wall thickness of the hot bent glass is stretched and changed, the contour degree precision of the glass surface is greatly fluctuated, and the precision required by customers is difficult to meet (for example, the contour 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 the hot bending forming of the 5D curved glass by one-step hot bending forming, in the hot bending forming process, the glass needs to be subjected to two stretching forces in opposite directions, the difficulty in controlling the wall thickness and the surface profile of the glass is high, in addition, the contact surface between the 2D state of the glass before the hot bending forming and the mold is small, 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 four sides of the periphery of the glass are bent in one direction (3D), and a crater-shaped protrusion is provided in the middle to be convexly bent in the opposite direction 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 manufacturing process for hot bending of 5D curved glass.
In order to solve the technical problems, the invention adopts the following technical scheme:
the manufacturing process of the 5D curved glass by hot bending comprises the steps of bending the circumferential edge of the 5D curved glass along a first direction to form a bent edge part, bending the middle part of the 5D curved glass along a second direction to form a crater-shaped bulge, and connecting parts for connecting the bent edge part and the crater-shaped bulge; the first direction is opposite to the second direction; the manufacturing process comprises the following steps:
the first step: placing the flat glass into a one-step hot bending die, enabling the flat glass to be in contact with the one-step hot bending die except the position A, and extruding the middle part of the flat glass into a groove along a second direction by the one-step hot bending die to obtain preliminary hot bending glass; the groove on the preliminary hot bent glass is the crater-shaped bulge, and the position A forms the side wall of the crater-shaped bulge;
and a second step of: placing the preliminary hot-bending glass into a two-step hot-bending die, wherein the shape of the middle cavity of the two-step hot-bending die is matched with the shape of the crater-shaped bulge, so that the two-step hot-bending die can be contacted with the crater-shaped bulge, the connecting part and the bending edge part in the preliminary hot-bending glass, and bending the bending edge part of the preliminary hot-bending glass along a first direction to obtain the 5D curved glass.
Further, the first hot bending die and the two-step hot bending die are graphite dies; the graphite mold has 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 0.4mm; the manufacturing process is suitable for processing glass with all thicknesses, but the glass with the thickness of less than 0.4mm has insufficient protection strength on electronic equipment, and the manufacturing process has more advantages when processing thin glass with the thickness of 0.4-1.1 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 an upper one-step die and a lower one-step die, wherein the upper surface of the lower one-step die is provided with a first groove for placing flat glass, the lower part of the middle part of the first groove is provided with a second groove, and the middle part of the lower surface of the upper one-step die is provided with a first bulge corresponding to the second groove; the upper die moves downwards in one step, when the first bulge stretches into the second groove, the flat glass is bent, part of the upper surface of the glass is contacted with each surface of the first bulge, and part of the lower surface of the glass is contacted with each surface of the second groove, so that the 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 identical to the middle part of the one-step upper die in structure, and the middle part of the two-step lower die is identical to the middle part of the one-step lower die in structure; the peripheral edge of the two-step upper die and the peripheral edge of the two-step lower die are provided with upward bending radians; when the preliminary hot-bending glass is put into the two-step hot-bending die, the first bulge of the two-step upper die is contacted with the inner surface of the crater-shaped bulge, the non-circumferential edge and the non-first bulge part of the two-step upper die are contacted with the upper surface of the connecting part, and the circumferential edge of the two-step lower die is contacted with the lower surface of the bent edge part 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 the one-time forming process, the two-time forming process can improve the contact area between the mold and the glass and the contact uniformity degree between the mold and the glass in the two-time hot bending forming process, has higher and more uniform heat transfer speed, and is convenient for controlling the wall thickness and the surface profile of the glass; meanwhile, in the two-time forming process, the glass is subjected to hot bending in one direction at a time, and the control precision of the wall thickness and the surface profile of the glass can be improved.
Drawings
FIG. 1 is a schematic diagram of a two-step hot bending die of the present invention in a closed configuration;
FIG. 2 is a schematic diagram of a prior art hot bending die;
FIG. 3 is a schematic view of a flat sheet of glass;
FIG. 4 is a schematic diagram of the structure of the one-step hot bending die of the present invention when the die is not closed;
FIG. 5 is a schematic view of the structure of the one-step hot bending die of the present invention when the die is not closed;
FIG. 6 is a schematic view of the structure of the one-step hot bending die of the present invention when the die is closed;
FIG. 7 is a schematic view of the structure of a preliminary hot bent glass according to the present invention;
FIG. 8 is a schematic view of the structure of the two-step hot bending mold of the present invention when the mold is not closed;
FIG. 9 is a schematic diagram of a two-step hot bending die of the present invention when not in clamping;
FIG. 10 is a schematic view of the structure of a 5D curved glass of the present invention;
FIG. 11 is a schematic view of the structure of the present invention with the CNC removal of the crater-shaped raised sealing surface.
Detailed Description
A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 10, the 5D curved glass 3 is referred to as having a curved edge portion 13 curved in a first direction, a crater-shaped protrusion 11 curved in a second direction in the middle, and a connecting portion 12 connecting the curved edge portion 13 and the crater-shaped protrusion 11, the first direction being opposite to the second direction. In this embodiment, the hot bending die is laid flat, the first direction being in an upward direction, and the second direction being in a downward direction.
As shown in fig. 2, when the glass is heated by the hot bending mold in the prior art, only the bulge of the upper mold and the edge of the lower mold are in contact with the glass, the bulge of the upper mold gives the downward force F1 to the glass, the edge of the lower mold gives the upward force F2 to the edge of the glass, the contact area is small, and the glass to be heated is unevenly and the heat transfer is slow.
The manufacturing process of the 5D curved glass 3 in the invention uses a method of twice hot bending forming; in the first hot bending forming, a one-step hot bending die is used to bend a crater-shaped protrusion 11 on the flat glass 1 along the second direction, in this embodiment, the 5D curved glass 3 is applied to a rear cover of a mobile phone or a protective shell of the mobile phone, the crater-shaped protrusion 11 is used for placing devices such as a camera module, and the sealing surface of the crater-shaped protrusion 11 needs to be removed later (the action can be used to confirm whether the sealing surface is necessary according to design requirements) by CNC equipment; when the flat glass is put into the one-step hot bending die, the flat glass can be contacted with the surface of the one-step hot bending die except the position A; after the first hot bending forming, obtaining preliminary hot bent glass 2, wherein the position A forms the side wall of the crater-shaped bulge; after the preliminary hot-bent glass 2 is cooled, the bent edge portion 13 of the preliminary hot-bent glass 2 is thermally bent in the first direction by using a two-step hot-bending mold, and the 5D curved glass 3 is obtained.
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 stretching of each part of the glass are affected when the glass is subjected to hot bending; compared with the primary forming process, the secondary forming process can improve the contact area between the die and the glass in the two hot bending forming processes, has higher heat transfer speed and more uniform heat transfer, and is convenient for controlling the wall thickness and the surface profile of the glass; meanwhile, in the two-time forming process, the glass is subjected to hot bending in one direction at a time, and the control precision of the wall thickness and the surface profile of the glass can be improved.
And performing first hot bending forming by using a one-step hot bending die, and performing second hot bending forming by using a two-step hot bending die.
As shown in fig. 1 to 11, the one-step hot bending die comprises an upper die 20 and a lower die 21, wherein a first groove 211 for placing the flat glass 1 is formed on the upper surface of the lower die 21, a second groove 212 is formed below the middle part of the first groove 211, and a first protrusion 201 corresponding to the second groove 212 is formed in the middle part of the lower surface of the upper die 20; when the upper mold 20 is moved downward in one step to make the first protrusion 201 extend into the second groove 212, the flat glass 1 is bent so that a part of the upper surface of the glass contacts each surface of the first protrusion 201 and a part of the lower surface contacts each surface of the second groove 212, forming the crater-shaped protrusion 11. And after the first hot bending forming, taking out the obtained preliminary hot bent 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, the middle part of the two-step upper die 30 has the same structure as the middle part of the one-step upper die 20, the middle part of the two-step lower die 31 has the same structure as the middle part of the one-step lower die 21, namely, the upper surface of the two-step lower die 31 is provided with a first groove 211 for placing the glass connecting part 12, the lower part of the middle part of the first groove 211 is provided with a second groove 212, and the middle part of the lower surface of the one-step upper die 20 is provided with a first bulge 201 corresponding to the second groove 212; the peripheral edges of the two-step upper die 30 and the peripheral edges of the two-step lower die 31 are provided with upward curved radians 301 and 311. When the preliminary hot-bending glass 2 is put 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 of the two-step upper mold 30 and the non-first protrusion 201 are in contact with the upper surface of the connecting portion 12, and the circumferential edge of the two-step lower mold 31 is in contact with the lower surface of the bent edge portion 13 of the preliminary hot-bending glass 2; the two-step upper mold 30 is moved downward so that the lower surface of the two-step upper mold 30 contacts the upper surface of the glass and the upper surface of the two-step lower mold 31 contacts the lower surface of the glass, thereby forming the 5D curved glass 3. The scheme provides a specific one-step hot bending die and two-step hot bending die structure.
The term "middle" in the present invention refers to the non-edge portions of each structure and is not limited to the geometric center of each structure.
In the present invention, the description of "bent edge portion of preliminary heat-bent glass" is presented, and only the bent edge portion is present on the 5D curved glass formed by the second heat-bending forming, and the bent edge portion of the preliminary heat-bent glass refers to the portion of the preliminary heat-bent glass to be heat-bent into the bent edge portion.
The one-step hot bending die and the two-step hot bending die in the embodiment adopt graphite dies, and the graphite dies have high heat transfer speed, uniform heat transfer and easy processing, and are suitable for being used as the materials of the dies for glass hot bending.
The hot bending forming manufacturing process is suitable for hot bending forming of glass with various thicknesses, but the glass with 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, 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 remarkably improve the forming precision, and the surface profile degree can be smaller 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 characteristics 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.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a single embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to specific embodiments, and that the embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.
Claims (3)
1. The manufacturing process of the 5D curved glass by hot bending comprises the steps of bending the circumferential edge of the 5D curved glass along a first direction to form a bent edge part, bending the middle part of the 5D curved glass along a second direction to form a crater-shaped bulge, and connecting parts for connecting the bent edge part and the crater-shaped bulge; the first direction is opposite to the second direction; the manufacturing process comprises the following steps:
the first step: placing the flat glass into a one-step hot bending die, enabling the flat glass to be in contact with the one-step hot bending die except the position A, and extruding the middle part of the flat glass into a groove along a second direction by the one-step hot bending die to obtain preliminary hot bending glass; the groove on the preliminary hot bent glass is the crater-shaped bulge, and the position A forms the side wall of the crater-shaped bulge;
and a second step of: placing the preliminary hot-bending glass into a two-step hot-bending die, wherein the shape of the middle cavity of the two-step hot-bending die is matched with the shape of the crater-shaped bulge, so that the two-step hot-bending die can be contacted with the crater-shaped bulge, the connecting part and the bending edge part in the preliminary hot-bending glass, and bending the bending edge part of the preliminary hot-bending glass along a first direction to obtain the 5D curved glass;
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 an upper one-step die and a lower one-step die, wherein the upper surface of the lower one-step die is provided with a first groove for placing flat glass, the lower part of the middle part of the first groove is provided with a second groove, and the middle part of the lower surface of the upper one-step die is provided with a first bulge corresponding to the second groove; the upper die moves downwards in one step, when the first bulge stretches into the second groove, the flat glass is bent, part of the upper surface of the glass is contacted with each surface of the first bulge, and part of the lower surface of the glass is contacted with each surface of the second groove, so that the 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 identical to the middle part of the one-step upper die in structure, and the middle part of the two-step lower die is identical to the middle part of the one-step lower die in structure; the peripheral edge of the two-step upper die and the peripheral edge of the two-step lower die are provided with upward bending radians; when the preliminary hot-bending glass is put into the two-step hot-bending die, the first bulge of the two-step upper die is contacted with the inner surface of the crater-shaped bulge, the non-circumferential edge and the non-first bulge part of the two-step upper die are contacted with the upper surface of the connecting part, and the circumferential edge of the two-step lower die is contacted with the lower surface of the bent edge part 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.
2. The process for manufacturing the 5D curved glass by hot bending according to claim 1, wherein: the first hot bending die and the two-step hot bending die are graphite dies.
3. The process for manufacturing the 5D curved glass by hot bending according to claim 1, wherein: the thickness of the 5D curved glass is greater than or equal to 0.4mm.
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 |
|---|---|
| CN114149169A CN114149169A (en) | 2022-03-08 |
| CN114149169B true CN114149169B (en) | 2024-03-29 |
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| 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 |
| 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 |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN114149169A (en) | 2022-03-08 |
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