CN109422445B - Processing method of bent glass product - Google Patents
Processing method of bent glass product Download PDFInfo
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- CN109422445B CN109422445B CN201710730313.6A CN201710730313A CN109422445B CN 109422445 B CN109422445 B CN 109422445B CN 201710730313 A CN201710730313 A CN 201710730313A CN 109422445 B CN109422445 B CN 109422445B
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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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B25/00—Annealing glass products
- C03B25/04—Annealing glass products in a continuous way
- C03B25/06—Annealing glass products in a continuous way with horizontal displacement of the glass products
- C03B25/08—Annealing glass products in a continuous way with horizontal displacement of the glass products of glass sheets
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- 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 provides a processing method of a bent glass product, which comprises the following steps: the preheating step specifically comprises the following steps: the glass plate is preheated in four stages by continuous temperature rise, and the temperature is raised to 740-760 ℃; the hot bending forming step specifically comprises the following steps: sequentially carrying out two-stage hot bending molding on the preheated glass plate to obtain a glass bending primary product; a cooling step, which specifically comprises: and cooling the bent glass primary product through four sections of continuous cooling to obtain the bent glass product. By applying the technical scheme of the invention, through continuous four-section preheating, continuous two-section hot bending forming and continuous four-section cooling, the glass can be ensured not to be broken in the processing process, defects such as pits, edge breakage and the like can be avoided in the processing process, and the productivity can be greatly improved.
Description
Technical Field
The invention relates to the technical field of hot bending processes, in particular to a processing method of a glass bending product.
Background
With the continuous development of the technology, the appearance requirements of glass products are more diversified. The technology for bending the four sides of a glass product (particularly a mobile phone cover plate) in the prior art comprises the steps of preheating, hot bending forming, cooling and the like, and the glass product with the bent four sides obtained by the prior art is easy to have the defects of glass breakage, appearance pockmark and the like.
Therefore, the method for processing the bent glass product has the advantages of simple process, convenience in operation and capability of greatly improving the yield of the product and is of great significance.
Disclosure of Invention
The first purpose of the invention is to provide a processing method of a glass bending product, which has simple process and convenient operation and can greatly improve the yield of the product, and the specific technical scheme is as follows:
a method of processing a bent glass product, comprising the steps of:
the preheating step specifically comprises the following steps: the glass plate is preheated in four stages by continuous temperature rise, and the temperature is raised to 740-760 ℃;
the hot bending forming step specifically comprises the following steps: sequentially carrying out two-stage hot bending molding on the preheated glass plate to obtain a glass bending primary product;
a cooling step, which specifically comprises: and cooling the bent glass primary product through four sections of continuous cooling to obtain the bent glass product.
Preferably, in the above technical solution, the preheating step includes a first preheating step, a second preheating step, a third preheating step, and a fourth preheating step;
in the first preheating step: the temperature is gradually increased from room temperature to T1, T1 is 490-510 ℃, and the temperature rise time is 110-130 seconds;
in the second preheating step: the temperature is gradually increased from T1 to T2, the temperature T2 is 610-630 ℃, and the temperature rise time is 110-130 seconds;
in the third preheating step: the temperature is gradually increased from T2 to T3, the T3 is 690-710 ℃, and the temperature rise time is 110-130 seconds;
in the fourth preheating step: the temperature is gradually increased from T3 to T4, the temperature T4 is 740-760 ℃, and the temperature rise time is 110-130 seconds.
Preferably, in the above technical solution, the hot-bending forming step includes forming in a first time period and forming in a second time period, and a forming temperature of the forming in the first time period is greater than or equal to a forming temperature of the forming in the second time period; and the molding pressure of the first time period molding is less than or equal to the molding pressure of the second time period molding.
Preferably in the above technical solution, during the first time period of molding: the molding temperature is kept between T4 and T5, and T5 is 735-745 ℃; the molding pressure is changed from 0.1MPa to 0.3MPa, and the molding time is 110-130 seconds;
when the second time period is formed: the molding temperature is kept between T5 and T6, the T6 is kept between 725 ℃ and 735 ℃, the molding is carried out under constant pressure, the molding pressure is 0.3MPa to 0.4MPa, and the molding time is 110 seconds and 130 seconds.
Preferably, in the above technical scheme, the cooling step includes a first stage cooling, a second stage cooling, a third stage cooling and a fourth stage cooling, and the first stage cooling, the second stage cooling, the third stage cooling and the fourth stage cooling are all assisted by cooling media;
in the first section of cooling process: the temperature is gradually reduced from T6 to T7, the temperature of T7 is 590-610 ℃, and the temperature reduction time is 110-130 seconds;
in the second stage of cooling process: the temperature is gradually reduced from T7 to T8, the T8 is 440-460 ℃, and the temperature reduction time is 110-130 seconds;
and in the third stage of cooling process: the temperature is gradually reduced from T8 to T9, the T9 is 270-290 ℃, and the temperature reduction time is 110-130 seconds;
in the fourth stage of cooling process: the temperature is gradually reduced from T9 to T10, the T10 is 90-110 ℃, and the temperature reduction time is 110-130 seconds.
Preferably, in the above technical scheme, the preheating step, the hot-bending forming step and the cooling step are all completed in the same ten-station push type hot-bending forming machine;
the ten-station push type hot bending forming machine comprises four preheating work stations, two forming work stations and four cooling work stations.
Preferably, the glass bending machine is further provided with a mold matched with the ten-station push type hot bending forming machine and a glass bending product, and the mold comprises an upper mold and a lower mold matched with the upper mold.
The processing method of the bent glass product has the following advantages:
1. the processing method comprises three steps of preheating, hot bending and forming and cooling, has simple process, can be directly matched with the existing hot bending equipment, does not need to redesign equipment, and greatly reduces the cost.
2. The preheating process of the invention is continuously heated for four sections to meet the characteristics of glass and eliminate the defects of pockmarks and the like generated by products; and in the preheating stage, the temperature is increased to 740-760 ℃ to reach the softening point of the glass, so that the glass plate can be completely softened, and the preparation is made for the subsequent hot bending forming.
3. The hot bending forming process of the invention is carried out by two-stage hot bending forming, the forming is carried out on the premise that the glass is completely softened, the glass can be pressed in place in the forming process, the product shaping is good, and the yield of the product is greatly improved.
4. The cooling step of the invention comprises four sections of cooling, the temperature is gradually reduced, the size of the product is in place and no rebound occurs in the cooling process, and the accurate size of the product is ensured.
5. According to the invention, through continuous four-section preheating, continuous two-section hot bending forming and continuous four-section cooling, the glass is not broken in the processing process, defects such as pits and broken edges are avoided in the processing process, and the productivity can be greatly improved.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a graph showing temperature changes in a processing method according to preferred embodiment 1 of the present invention.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1:
a processing method of a glass bending product (specifically a mobile phone glass panel with four curved sides) adopts a ten-station push type hot bending forming machine and a set of dies matched with the ten-station push type hot bending forming machine and the glass bending product to process, wherein the dies comprise an upper die and a lower die matched with the upper die.
The processing flow is as follows: cleaning the mold by using dust-free cloth and alcohol, placing the cleaned glass plate on a lower mold, and then covering an upper mold; placing the mould with the plate at the inlet of a hot bending device, and automatically pushing the mould into a heating furnace chamber; and taking out the glass bending product from an outlet of the hot bending equipment.
The processing process specifically comprises a preheating step, a hot bending forming step and a cooling step, wherein the temperature change is detailed as shown in figure 1, and the details are as follows:
the preheating step specifically comprises the following steps: the glass plate is preheated in four stages by continuous temperature rise, and the temperature is raised to 740-760 ℃. The fourth preheating step is specifically a first preheating step, a second preheating step, a third preheating step and a fourth preheating step:
in the first preheating step: the temperature is gradually increased from room temperature to T1, the temperature is increased to 500 ℃ at T1, the temperature rising time is 120 seconds, and in the process: the set temperature is too low, the hot bending die is difficult to transfer heat in a short time, the set temperature is too high, cold glass is subjected to strong impact force, and the glass can be broken.
In the second preheating step: the temperature is gradually increased from T1 to T2, the temperature is increased to 620 ℃ at T2, the temperature rise time is 120 seconds, and in the process: if the set temperature is too low, the mold temperature is difficult to transfer to the glass sheet, and if the set temperature is too high, the heat is too high, and the glass is likely to crack, resulting in defects.
In the third preheating step: the temperature is gradually increased from T2 to T3, T3 is 700 ℃, the temperature rise time is 120 seconds, and in the process: if the set temperature is too low, the glass plate is difficult to soften and cannot achieve the effect, and if the set temperature is too high, the glass expands too fast, and the edge of the glass can be cracked, so that the defects are caused.
In the fourth preheating step: the temperature is gradually increased from T3 to T4, T4 is 750 ℃, the temperature rise time is 120 seconds, and in the process: if the set temperature is too low, the glass is not softened and is difficult to form, and if the set temperature is too high, molecules in the glass are heated to a temperature higher than the set temperature, pocking marks are generated, and the appearance is poor.
When the glass reaches the softening point, the glass is molded again, so that the glass can be ensured not to be broken in the processing process.
The hot bending forming step specifically comprises the following steps: and sequentially carrying out two-stage hot bending molding on the preheated glass plate to obtain a glass bending primary product. The hot bending forming step comprises a first time period forming step and a second time period forming step:
during the first time period, forming: the molding temperature is kept between T4 and T5, and 740 ℃ can be selected from T5 (namely, a small amount of temperature drop can be caused in the molding process, and the molding effect is not influenced); the forming air pressure is changed in three stages: the first stage is 0.1MPa, the second stage is 0.2MPa, the third stage is 0.3MPa, the molding time of the first stage, the second stage and the third stage is 40 seconds respectively, in the process: the glass forming device has the advantages that the set temperature is too high, mold marks and concave-convex points can be generated, the appearance is poor, the set temperature is too low, the glass cannot be pressed in place in the forming process, the forming pressure is set to be too high, and the glass is easy to crush.
When the second time period is formed: the molding temperature is kept at T5-T6, T6 can be chosen at 730 ℃ (namely, a small amount of temperature drop can be caused in the molding process, the molding effect is not influenced), the molding is carried out at constant pressure, the molding pressure is 0.4MPa, the molding time is 120 seconds, and in the process: play the pressurize effect, glass shaping position, the temperature is set for too high, can lead to there being the mould seal, and the temperature is set for too low, and the cooling is too fast, leads to the size bad, and the pressure sets for the pressurize, does not bounce-back when the cooling, guarantees the size precision of 3D product.
A cooling step, which specifically comprises: and (3) carrying out four-section cooling on the bent glass initial product through continuous cooling (the four-section cooling process adopts the auxiliary action of a cooling medium, wherein the cooling medium adopts cooling water, and in the specific application, other conventionally used cooling media such as air cooling can also be adopted), thus obtaining the bent glass product. The cooling step comprises a first section of cooling, a second section of cooling, a third section of cooling and a fourth section of cooling:
in the first section of cooling process: the temperature is gradually reduced from T6 to T7, the T7 is 600 ℃, and the cooling time is 120 seconds.
In the second stage of cooling process: the temperature is gradually reduced from T7 to T8, the T8 is 450 ℃, and the cooling time is 120 seconds.
And in the third stage of cooling process: the temperature is gradually reduced from T8 to T9, the T9 is 280 ℃, and the cooling time is 120 seconds.
In the fourth stage of cooling process: the temperature is gradually reduced from T9 to T10, the T10 is 100 ℃, and the cooling time is 120 seconds.
The cooling is carried out by using cooling water at the temperature of 19-22 ℃, and the formed 3D glass product is rapidly cooled on the premise of not influencing the performance of the product, so that the capacity can be improved.
The properties of the bent glass product obtained by the processing method of example 1 are shown in Table 1.
Table 1 comparison of the parameters of example 1 and comparative example 1 and the properties of the products obtained
As can be seen from table 1:
by adopting the technical scheme of the invention, the effects are as follows: (1) the problem of breakage of glass products can be improved; (2) the appearance of the glass product is good and free of pockmarks; (3) the precision problem of the product can be improved; (4) according to the hot bending process parameter production, the productivity and the yield can be improved, and the quality requirements of customers can be met regardless of the size, the appearance, the profile degree, the efficiency and the like.
By adopting the technical scheme of the comparative example 1, only one work station is adopted for preheating, so that the glass is molded when the glass does not reach the softening point, the glass is broken, and the product is scratched when the glass is molded in the heating process; when the molding time is too long, mold marks, pockmarks and concave-convex points can appear.
The method is applicable to various 3D mobile phone cover plate glasses with four curved sides, in particular to mobile phone cover plate glasses with the thickness of 0.6mm to 0.8 mm. Under the adjustment of hot bending process parameters and pressure, the requirements of customers can be met no matter the appearance of the 3D glass or the size of the 3D glass.
Comparative example 1:
see application No. 201210304421.4 for details, and reference is made to this method for producing a cell phone glass panel having a four-sided bend.
The properties of the product obtained by the process of comparative example 1 are specified in Table 1.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A method for processing a bent glass product is characterized in that: the method comprises the following steps:
the preheating step specifically comprises the following steps: the glass plate is preheated in four stages by continuous temperature rise, and the temperature is raised to 740-760 ℃;
the hot bending forming step specifically comprises the following steps: sequentially carrying out two-stage hot bending molding on the preheated glass plate to obtain a glass bending primary product;
a cooling step, which specifically comprises: cooling the glass bending primary product through four sections of continuous cooling to obtain a glass bending product;
the hot bending forming step comprises a first time period forming step and a second time period forming step, wherein the forming temperature of the first time period forming step is greater than or equal to the forming temperature of the second time period forming step; the molding pressure of the first time period molding is less than or equal to the molding pressure of the second time period molding;
during the first time period, forming: the molding temperature is kept between T4 and T5, and T5 is 735-745 ℃; the molding pressure is changed from 0.1MPa to 0.3MPa, and the molding time is 110-130 seconds;
when the second time period is formed: the molding temperature is kept between T5 and T6, the T6 is kept between 725 ℃ and 735 ℃, the molding is carried out under constant pressure, the molding pressure is 0.3MPa to 0.4MPa, and the molding time is 110 seconds and 130 seconds;
the preheating step comprises a first preheating step, a second preheating step, a third preheating step and a fourth preheating step;
in the first preheating step: the temperature is gradually increased from room temperature to T1, T1 is 490-510 ℃, and the temperature rise time is 110-130 seconds;
in the second preheating step: the temperature is gradually increased from T1 to T2, the temperature T2 is 610-630 ℃, and the temperature rise time is 110-130 seconds;
in the third preheating step: the temperature is gradually increased from T2 to T3, the T3 is 690-710 ℃, and the temperature rise time is 110-130 seconds;
in the fourth preheating step: the temperature is gradually increased from T3 to T4, the temperature T4 is 740-760 ℃, and the temperature rise time is 110-130 seconds.
2. The method of processing a glass bent product according to claim 1, characterized in that: the cooling step comprises a first stage of cooling, a second stage of cooling, a third stage of cooling and a fourth stage of cooling, wherein the first stage of cooling, the second stage of cooling, the third stage of cooling and the fourth stage of cooling are all assisted by cooling media;
in the first section of cooling process: the temperature is gradually reduced from T6 to T7, the temperature of T7 is 590-610 ℃, and the temperature reduction time is 110-130 seconds;
in the second stage of cooling process: the temperature is gradually reduced from T7 to T8, the T8 is 440-460 ℃, and the temperature reduction time is 110-130 seconds;
and in the third stage of cooling process: the temperature is gradually reduced from T8 to T9, the T9 is 270-290 ℃, and the temperature reduction time is 110-130 seconds;
in the fourth stage of cooling process: the temperature is gradually reduced from T9 to T10, the T10 is 90-110 ℃, and the temperature reduction time is 110-130 seconds.
3. The method of processing a glass bent product according to any one of claims 1 or 2, characterized in that: the preheating step, the hot bending forming step and the cooling step are all finished in the same ten-station push type hot bending forming machine;
the ten-station push type hot bending forming machine comprises four preheating work stations, two forming work stations and four cooling work stations.
4. The method of processing a glass bent product according to claim 3, characterized in that: the glass bending machine is also provided with a mould matched with the ten-station push type hot bending forming machine and a glass bending product, and the mould comprises an upper mould and a lower mould matched with the upper mould.
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| CN112479572A (en) * | 2020-12-25 | 2021-03-12 | 安徽金龙浩光电科技有限公司 | Servo transposition forming debugging method for 3D glass hot bending machine |
| CN112759236B (en) * | 2021-01-05 | 2023-03-24 | 四川虹科创新科技有限公司 | Variable-thickness curved glass and forming method and application thereof |
| CN113461316A (en) * | 2021-07-19 | 2021-10-01 | 东莞市微科光电科技有限公司 | Method for molding glass |
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