CN110894136A - Method for manufacturing toughened glass plate - Google Patents

Abstract

A method for manufacturing a toughened glass sheet, comprising the steps of air-quenching toughening to quench a glass sheet heated to near its softening point to generate compressive stress in the surface layer of the glass sheet, and raising the temperature of the glass sheet from ambient temperature to a predetermined temperature by lowering the toughening g temperature to cause forced fracture of the glass sheet for removing defective products by changing the temperature of the glass sheet from α -NiS (α phase) to β -NiS (β phase) as a result of enlargement of its volume, characterized in that the predetermined temperature and the rate of temperature rise to the predetermined temperature satisfy any of the conditions of a rate of temperature rise of about 3 ℃/min, a predetermined temperature of 170 DEG-320 ℃, a rate of temperature rise of about 5 ℃/min, a predetermined temperature of 180 DEG-320℃, a rate of temperature rise of about 6 ℃/min, and a predetermined temperature of 185-325 DEG, a rate of temperature rise of about 20 ℃/min, a predetermined temperature of 235-345 ℃, a rate of temperature rise of temperature of about 40 min, a predetermined temperature of 270-270 ℃ or 270-270 ℃ and a predetermined temperature rise of 285 ℃ of about 285-325 ℃.

Description

Method for manufacturing toughened glass plate

Technical Field

The invention relates to the field of glass processing equipment, in particular to a manufacturing method of a toughened glass plate.

Background

In a conventional method for producing soda lime glass, particles (e.g., stainless steel particles) contained in stainless steel used inside a melting furnace may be mixed into molten glass in a step of melting glass raw materials at a high temperature of approximately 1500 ℃ in a melting furnace, and the Ni components may react with sulfur (S) components contained in mirabilite (Na2SO 26) as glass raw materials, as a result, nickel sulfide (NIS) may be present in a melt-molded glass substrate, in a defective glass product, the incidence of NIS impurities is very low, i.e., the number of impurities is approximately 10 tons (t) in the glass product 1. in addition, since the impurities are spherical, the particle size is less than 0.3mm, it is very difficult to detect impurities on a production line, in order to process such a glass substrate formed of soda lime glass into a glass product for use in building and automotive glass products, the glass sheet has been widely used as a window pane of buildings and a side window and a rear window of automobiles, and has been widely used as a glass side window and a rear window of a glass, a glass sheet is rapidly heated and a glass-toughened by a process in which a temperature is increased by a temperature of approximately equal to approximately 100 ℃ as a temperature of a SO-350 ℃ when a glass-350-500 ℃ in a glass-500-mm glass-mm, a glass-500-mm, a glass-3 mm, a glass-tempering stress phase, a glass-quenching stress-quenching process, a glass-quenching stress layer, a glass sheet is rapidly increased, and a glass sheet is heated glass sheet, and a glass toughening stress layer, which is increased by a stress is increased by a heating process of a quenching process, and a tempering furnace, and a glass sheet is increased by a stress, which is increased by a tempering furnace, and a glass sheet is increased by a tempering furnace, and a tempering furnace.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned deficiencies of the prior art and providing a method of manufacturing a toughened glass sheet that effectively eliminates any defective products.

The method comprises the following steps of carrying out air quenching toughening, quenching the glass plate heated to be close to the softening point of the glass plate, and thus generating compressive stress in the surface layer of the glass plate, reducing the toughening g temperature, and raising the temperature of the glass plate from the ambient temperature to a preset temperature, so that nickel sulfide (NiS) existing in the form of molten impurities in the glass plate is converted from α -NiS (α phase) to β -NiS (β phase) along with the volume expansion of the glass plate, and the forced fracture of the glass plate for removing defective products is caused, wherein the preset temperature and the temperature raising rate reach the preset temperature and meet any one of the following conditions that the temperature raising rate is about 3 ℃/min, the preset temperature is in the range of 170-320 ℃, the temperature raising rate is about 5 ℃/min, the preset temperature is in the range of 180-320 ℃, the temperature raising rate is about 6 ℃/min, the preset temperature raising rate is about 185-325 ℃, the temperature raising rate is about 20 ℃/min, the preset temperature is between 235-345 ℃, the temperature raising rate is about 40 min, the preset temperature is between 270-270 ℃, or the temperature raising rate is about 350-285 ℃ in the range of 50 ℃/min.

The temperature of the glass sheet is raised to the predetermined temperature range, and then the glass sheet is maintained at an elevated temperature for a certain period of time.

Selenium (Se) is added at least to the glass plate as a coloring component.

When further growth of the crack is desired, the glass sheet is further held at any temperature within any temperature range for at least a predetermined period of time not exceeding 60 minutes.

The invention has the beneficial effects that: can remove all toughened glass products containing nickel sulfide and can effectively remove defective products.

Drawings

Fig. 1 is a graph of the relationship between temperature hold time, temperature and phase change.

Fig. 2 is a flow chart of the present invention.

Detailed Description

In fig. 1, the y-axis represents temperature, the x-axis represents time, the symbol "O" represents incomplete β phase, and the symbol ". x" represents complete β phase, a phase transition curve is drawn by connecting plots of incomplete β phase and complete β phase interfaces, the conditions of the temperature rise rate and the temperature range are the temperature and time conditions of the nickel sulfide particles themselves, when a toughened glass sheet is used, the temperature rise condition may vary according to the thickness of the glass sheet, therefore, the conditions of the soaking furnace are preferably adjusted according to the temperature of the surface of the glass sheet as a function of time, therefore, according to the properties, the toughened glass may be preferably maintained at any temperature within the above temperature range for a specific time within 5 to 60 minutes, when the tempered glass subjected to the dipping treatment is a colored glass containing iron oxide (Fe2O3) in an amount of 0.01 to 0.6 wt.%, the defective product of the tempered glass containing nickel sulfide (NiS) may be removed by satisfying the above conditions of the temperature rise ra.

In fig. 2, a method of manufacturing toughened glass sheets, the glass sheets being conveyed from a heating furnace 2 at around 620 ℃ and heated to near their softening point in an air-quench toughening section 4, are quenched to about 450 ℃. quenching causes compressive stress in the surface of the glass sheets, thereby forming toughened glass sheets, the air-quench toughened glass sheets are annealed to normal temperature, then, the toughened glass sheets at ambient temperature are transferred to a soaking furnace 6, and the temperature in the furnace is raised to a predetermined temperature range at a predetermined temperature rise rate, when the toughened glass sheets contain α -NiS (α phase), α -NiS (α phase) undergoes a phase change of α -NiS (α phase) due to the phase change, the NiS undergoes a volume expansion of about 4% to cause breakage of glass sheets containing α -NiS (α phase) due to phase change, the glass sheets undergo a crushing by a washing machine, are collected as final products in a pickup section, and then transferred to a subsequent step for setting a preferable soaking process and a glass sheet thickness range, a glass sheet thickness change is performed by a high temperature change from a glass sheet thickness phase change of about 2-2 glass sheet thickness change to a glass sheet thickness change, which is shown by a glass sheet thickness change by a high temperature change from a glass composition of no more as a glass sample of no trace element no element, No. 2, No. 7 mm, No. 2, No. 6, No. 2 is added to No. 2, No. 2 is added to No. 3-2, No. 2, a glass sheet is added to No. 2 glass sheet is added to a glass sheet with a glass sheet having a glass sheet with a composition, a glass sheet with a composition of a glass sheet with a glass sheet thickness change, a composition of a glass sheet thickness change, a composition of a glass sheet composition of a glass.

Claims (4)

1. A method for manufacturing a toughened glass sheet, characterized by comprising the steps of air-quenching toughening to quench a glass sheet heated to near its softening point to generate compressive stress in the surface layer of the glass sheet, and raising the temperature of the glass sheet from ambient temperature to a predetermined temperature by lowering the toughening g temperature to cause forced fracture of the glass sheet for removing defective products by changing the temperature of the glass sheet from α -NiS (α phase) to β -NiS (β phase) with the enlargement of its volume, characterized in that the predetermined temperature and the rate of temperature rise to the predetermined temperature satisfy any of the conditions of a rate of temperature rise of about 3 ℃/min, a predetermined temperature within the range of 170-320 ℃, a rate of temperature rise of about 5 ℃/min, a predetermined temperature within the range of 180-320 ℃, a rate of temperature rise of about 6 ℃/min, and a predetermined temperature rise of about 185-325 ℃, a rate of temperature rise of about 20 ℃/min, a predetermined temperature of 235-270 ℃ or 270-270 ℃ inclusive.

2. The method of claim 1, wherein the step of forming the toughened glass sheet comprises: the temperature of the glass sheet is raised to the predetermined temperature range, and then the glass sheet is maintained at an elevated temperature for a certain period of time.

3. The method of claim 1, wherein the step of forming the toughened glass sheet comprises: selenium (Se) is added at least to the glass plate as a coloring component.

4. The method of claim 1, wherein the step of forming the toughened glass sheet comprises: when further growth of the crack is desired, the glass sheet is further held at any temperature within any temperature range for at least a predetermined period of time not exceeding 60 minutes.

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