CN112624587A - Horizontal roller way type glass continuous toughening method - Google Patents
Horizontal roller way type glass continuous toughening method Download PDFInfo
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- CN112624587A CN112624587A CN202110042732.7A CN202110042732A CN112624587A CN 112624587 A CN112624587 A CN 112624587A CN 202110042732 A CN202110042732 A CN 202110042732A CN 112624587 A CN112624587 A CN 112624587A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B27/00—Tempering or quenching glass products
- C03B27/04—Tempering or quenching glass products using gas
- C03B27/044—Tempering or quenching glass products using gas for flat or bent glass sheets being in a horizontal position
Abstract
A horizontal roller way type glass continuous toughening method, glass is carried and driven by a roller way in toughening equipment, the glass is firstly put into a heating furnace to be heated to begin softening until reaching a target temperature and then is taken out of the furnace, then enters a toughening grid to be quenched and is continuously cooled to be completely hardened until being close to normal temperature, toughened glass is obtained, when the glass is in a softening state, namely the glass is heated to begin softening in the heating furnace until being cooled to be hardened in the toughening grid, and the glass continuously moves along the same direction under the driving of the roller way; the glass is heated in the heating furnace to the target temperature, then is discharged from the furnace and enters the toughening grid, and the glass is quenched from the beginning of entering the toughening grid to the completion of quenching at a constant motion speed of not less than 400 mm/s. According to the scheme, the transmission speed in the toughening process is optimized, so that the uniformity and the flatness of the surface stress of the glass product in the horizontal roller way type glass continuous toughening method are improved, the equipment cost is reduced, and the production floor area is reduced.
Description
Technical Field
The invention relates to the technical field of glass toughening treatment, in particular to a horizontal roller way type continuous glass toughening method.
Background
At present, in the horizontal roller way type continuous glass toughening process, the transmission movement speed of glass is less than 200mm/s, the speed is too low, the time for passing through a cold junction and a hot junction is too long, and the temperature gradient of the glass along the process movement direction is too large, so that the stress difference of the front end and the rear end of the glass surface is too large. And because the transmission movement speed of the glass is too low, the time for the glass to cross the roller way interval in a softening state is longer, the collapse amplitude is larger, and the flatness index of a toughened glass product is poor. The glass is conveyed at a constant speed, and in order to maintain the necessary heating and cooling time at the constant advancing speed, the equipment for realizing the toughening method has the advantages of longer length, high equipment cost and large occupied area.
That is to say, the currently and generally applied horizontal roller way type glass continuous toughening method has the defects of overlarge surface stress difference of glass products, low flatness, high equipment cost and large occupied area.
Disclosure of Invention
The invention aims to solve the technical problem and provide a horizontal roller way type continuous glass toughening method.
The technical scheme adopted by the invention is as follows: a horizontal roller way type continuous toughening method for glass, the glass is carried and driven by a roller way in toughening equipment, the glass is firstly put into a heating furnace to be heated to begin softening until reaching a target temperature, then is taken out of the furnace, then enters a toughening grid to be quenched and is continuously cooled until being completely hardened until approaching normal temperature, and toughened glass is obtained,
when the glass is in a softening state, namely the glass is heated in the heating furnace to begin softening until the glass is cooled in the toughening grid to be hardened, the glass is driven by the roller conveyor to continuously move along the same direction;
the glass is heated in the heating furnace to the target temperature, then is discharged from the furnace and enters the toughening grid, and the glass is quenched from the beginning of entering the toughening grid to the completion of quenching at a constant motion speed of not less than 400 mm/s.
Further optimizing, the movement speed of the glass from the beginning of quenching to the completion of quenching is 550-650 mm/s.
Further optimization, the glass continuously moves along the same direction in the whole process of toughening processing.
Further optimizing, the moving speed of the glass heated in the heating furnace to the target temperature before entering the tempering grid and beginning quenching is not less than the moving speed at the previous moment.
Further optimizing, the moving speed of the glass after quenching in the tempering grid is not more than the moving speed of the glass at the previous moment.
Further optimizing, when the glass is in a non-softening state in the heating furnace or the tempering grid, the glass reciprocates under the driving of the roller conveyor.
The invention has the beneficial effects that:
according to the scheme, through the optimized design, the transmission mode and the speed of the glass in the softening stage and the quenching stage in the tempering process are accurately set, and the method specifically comprises the following steps: when the glass is in a softening state, namely the glass is heated in the heating furnace to begin softening until the glass is cooled in the toughening grid to be hardened, the glass is driven by the roller conveyor to continuously move along the same direction; the glass is heated to the target temperature in the heating furnace, then is discharged from the furnace and enters the toughening grid, and the movement speed from the beginning of the quenching to the completion of the quenching is the uniform movement of not less than 400 mm/s.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention; part (a) of the attached drawings is a schematic diagram of glass toughening equipment; (b) the part is the velocity distribution diagram of each moment in the glass toughening process of the first embodiment; (c) the part is the velocity distribution diagram of each moment in the glass toughening process of the second embodiment; (d) and part of the velocity profile at each moment in the glass tempering process of the third embodiment.
Description of reference numerals: l-a loading platform, H-a heating furnace, C-a tempering grid and U-an unloading platform; 1-glass, 2-roller bed, 3-heating element, 4-blowing nozzle.
Detailed Description
The invention is described in detail below by way of exemplary embodiments. It should be understood, however, that elements and features of one embodiment may be beneficially incorporated in other embodiments without further recitation.
A horizontal roller way type continuous toughening method for glass, the glass is carried and driven by a roller way in toughening equipment, the glass is firstly put into a heating furnace to be heated to begin softening until reaching a target temperature, then is taken out of the furnace, then enters a toughening grid to be quenched and is continuously cooled until being completely hardened until approaching normal temperature, and toughened glass is obtained,
when the glass is in a softening state, namely the glass is heated in the heating furnace to begin softening until the glass is cooled in the toughening grid to be hardened, the glass is driven by the roller conveyor to continuously move along the same direction;
the glass is heated in the heating furnace to the target temperature, then is discharged from the furnace and enters the toughening grid, and the glass is quenched from the beginning of entering the toughening grid to the completion of quenching at a constant motion speed of not less than 400 mm/s.
In the scheme, the movement speed of the glass from the beginning of quenching to the completion of quenching is 550-650 mm/s.
In the scheme, the glass continuously moves along the same direction in the whole process of toughening processing.
In the scheme, the moving speed of the glass heated in the heating furnace to the target temperature before entering the tempering grid and beginning quenching is not less than the moving speed at the previous moment.
In the scheme, the movement speed of the glass after quenching in the tempering grid is not more than the movement speed of the glass at the previous moment.
In the scheme, when the glass is in a non-softening state in the heating furnace or the tempering grid, the glass is driven by the conveying roller way to reciprocate.
Examples 1,
As shown in (a) and (b) of the attached fig. 1, the toughening process equipment for realizing the invention mainly comprises a loading platform L, a heating furnace H, a toughening grid C and an unloading platform U which are sequentially arranged along the process trend direction.
(b) The distribution diagram of the glass transmission speed of the first horizontal roller way type glass continuous toughening method embodiment of the invention is shown. The horizontal axis of the coordinate system is a time parameter T, and the vertical axis is a speed parameter V. T1, T2, T3, T4 respectively represent specific process moments during the glass tempering process: wherein T1 is the time when the glass starts to soften, and is the initial time of the softening state; t2 is the time when the glass begins to quench; t3 is the quenching time of the glass; t4 is the time when the glass is cooled to be hardened, and is the end time of the above-mentioned softened state.
The glass 1 is carried and driven by a group of horizontally placed conveying roller ways 2 of toughening equipment, after the loading of a loading platform L is finished, the glass firstly enters a heating furnace H and is heated by a heating element 3 of the heating furnace H to begin softening (time T1) until the glass reaches a target temperature, then is discharged from the furnace, then enters a toughening grid C, is quenched (from time T2 to time T3) under the air cooling effect of a blowing nozzle 4 of the toughening grid C, is continuously cooled and hardened (time T4) until the temperature is close to the normal temperature, and the toughened glass is obtained.
The glass 1 is in a softened state, i.e., the glass 1 is continuously moved in the downstream direction by the driving of the conveying roller table from being heated in the heating furnace H to start softening (time T1) until being cooled in the tempering grid to be hardened (time T4). That is, the running speeds Vh1, Vc1 in the process of the glass 1 from the time T1 to the time T4 are all greater than 0. In the process of the glass from the time T1 to the time T4, the glass 1 is in a softened state, if the movement reversing pause of the glass 1 under the bearing and transmission of the roller bed 2 can cause the time of crossing the distance between the rollers to be obviously prolonged, the collapse amplitude can be increased, and the flatness of a toughened glass product is deteriorated; the glass 1 continuously moves towards the downstream direction under the driving of the roller way 2, so that the time for the glass 1 to cross the distance between the roller way 2 is greatly reduced, the collapse amplitude is reduced, and the flatness of the toughened glass 1 product is improved.
The glass 1 is heated to the target temperature in the heating furnace H, then is discharged from the furnace and enters the toughening grid C, and the movement speed Vc from the beginning of quenching (time T2) after the glass enters the toughening grid C to the end of quenching (time T3) is uniform movement not less than 400mm/s, and the preferable speed is 550-650 mm/s. It should be noted that: the uniform setting aims to reduce the friction force between the roller way 2 and the lower surface of the glass 1, reduce scratches and improve the optical quality of a toughened product of the glass 1; the speed of the glass 1 entering the tempering grid C from the heating furnace H is increased as much as possible, the time of the glass entering the quenching process and leaving the quenching process is shortened, the temperature gradient of the glass along the process movement direction is greatly reduced, the stress difference of the glass surface is further reduced, and the tempering stress is uniform.
The temperature at which the glass 1 is in the softened state is also different for different glasses. If the toughened glass is common white glass, the softening state is that the temperature is not lower than 500 ℃; if the toughened glass is soda-lime-silica glass, the softening state is that the temperature is not lower than 680 ℃; if the toughened glass is high borosilicate glass, the softening state is that the temperature is not lower than 845 ℃.
Furthermore, the following manner may also be followed: the glass 1 is continuously moved in the downstream direction throughout the tempering process, that is, the glass 1 is continuously moved in the downstream direction after being heated to be softened in the heating furnace H (time T1) and cooled to be hardened in the tempering grid C (time T4). The moving speed of the glass 1 heated to the target temperature in the heating furnace H before the glass enters the tempering grid C to start quenching (time T2) is not less than the moving speed of the glass at the previous time; the moving speed of the glass 1 after quenching in the tempering grid C is not more than the moving speed of the glass at the previous moment. When the glass is in a hard state, the movement speed is lower, the time for crossing the roller way interval is longer, so that the collapse cannot be caused, the flatness of a glass toughened product is not influenced, the heating furnace H and the toughening grid C can be designed to be shorter under the necessary heating time and cooling time, the equipment cost is saved, and the occupied production site is reduced. From the time T1 to the time T2, the glass 1 is softer than the previous time, the movement speed is higher, the time for jumping the distance between the conveying roller ways 2 is shortened, and the flatness of the glass 1 is improved; similarly, from time T3 to time T4, glass 1 is harder than the previous time, and the speed of movement is slower a bit, and the time length of crossing the 2 intervals of roll table is little to the roughness, can shorten the design length of tempering bars C on the contrary, saves equipment cost, reduces the production place and occupies.
Specifically, in this embodiment, before the time T2, the glass 1 moves downstream at a lower constant speed Vh1, passes through the time T1, accelerates to Vc before the time T2, moves from the time T2 to the time T3 at the constant speed Vc, decelerates to Vc1 and moves to the time T4 at the constant speed, decelerates to Vc2 and moves at the constant speed until the whole process is completed, and the glass tempering product is obtained and unloaded.
Examples 2,
As shown in (a) and (c) of the attached drawings.
(c) The distribution diagram of the glass transmission speed of the second horizontal roller way type glass continuous toughening method embodiment of the invention is shown.
This embodiment is a special case of embodiment one, and the difference is that: the glass 1 moves in the downstream direction at a constant Vc speed in the whole toughening processing process.
Examples 3,
As shown in (a) and (d) of the drawing.
(d) The distribution diagram of the glass transmission speed of the third embodiment of the horizontal roller way type glass continuous toughening method is shown.
The present embodiment is different from the first embodiment in that: when the glass 1 is in a non-softened state in the heating furnace H or the tempering grid C, that is, before the glass 1 is heated to start softening in the heating furnace H (time T1) and after the glass 1 is cooled to be hardened in the tempering grid C (time T4), the glass 1 is driven by the roller conveyor 2 to reciprocate, so that the glass 1 can be heated or cooled for a sufficiently long time in a short length space without excessively low moving speed. When the glass 1 is in a hard state, compared with the soft lower surface, the soft lower surface has enough strength to resist scratches and collapse caused by the pause of the reciprocating motion and the acceleration of reversing, and can not cause obvious negative effects on the flatness and the surface optical quality of a toughened product of the glass 1, so the design length of the toughened grid C can be further shortened by the reciprocating motion design of the glass 1 in a non-softening state, the equipment cost is saved, and the occupied production field is reduced.
According to the three embodiments, the defects of overlarge surface stress difference, low flatness, high equipment cost and large occupied space of the glass product in the currently and generally applied horizontal roller way type glass continuous toughening method are well overcome, the uniformity and the flatness of the surface stress of the glass product in the horizontal roller way type glass continuous toughening method are improved, the equipment cost is reduced, and the production occupied area is reduced.
It should be noted that while the invention has been described in terms of the above-mentioned embodiments, other embodiments are also possible. It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended that all such changes and modifications be covered by the appended claims and their equivalents.
Claims (6)
1. A horizontal roller way type glass continuous toughening method is characterized in that glass is carried and driven by a conveying roller way in toughening equipment, is firstly heated in a heating furnace to be softened and discharged out of the furnace until reaching a target temperature, then enters a toughening grid for quenching and is continuously cooled to be completely hardened until being close to normal temperature, and toughened glass is obtained, and the method comprises the following steps:
when the glass is in a softening state, namely the glass is heated in the heating furnace to begin softening until the glass is cooled in the toughening grid to be hardened, the glass is driven by the roller conveyor to continuously move along the same direction;
the glass is heated in the heating furnace to the target temperature, then is discharged from the furnace and enters the toughening grid, and the glass is quenched from the beginning of entering the toughening grid to the completion of quenching at a constant motion speed of not less than 400 mm/s.
2. The continuous toughening method of the horizontal roller way type glass according to claim 1, characterized in that: the moving speed of the glass from the beginning of quenching to the completion of quenching is 550-650 mm/s.
3. The continuous toughening method of the horizontal roller way type glass according to claim 1, characterized in that: the glass is continuously moved in the same direction throughout the tempering process.
4. The continuous toughening method of the horizontal roller way type glass according to claim 1, characterized in that: the moving speed of the glass heated in the heating furnace to the target temperature before entering the tempering grid and beginning quenching is not less than the moving speed at the previous moment.
5. The continuous toughening method of the horizontal roller way type glass according to claim 1, characterized in that: the moving speed of the glass after quenching in the tempering grid is not more than the moving speed of the glass at the previous moment.
6. The continuous toughening method of the horizontal roller way type glass according to claim 1, characterized in that: when the glass is in a non-softening state in the heating furnace or the tempering grid, the glass reciprocates under the driving of the roller conveyor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110042732.7A CN112624587A (en) | 2021-01-13 | 2021-01-13 | Horizontal roller way type glass continuous toughening method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110042732.7A CN112624587A (en) | 2021-01-13 | 2021-01-13 | Horizontal roller way type glass continuous toughening method |
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| CN112624587A true CN112624587A (en) | 2021-04-09 |
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Cited By (1)
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| CN115368004A (en) * | 2022-08-29 | 2022-11-22 | 洛阳北方玻璃技术股份有限公司 | Method for toughening glass by using ultra-short continuous furnace |
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