CN101700957B - Method for removing microcrack at glass edge and improving glass strength - Google Patents

Method for removing microcrack at glass edge and improving glass strength Download PDF

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CN101700957B
CN101700957B CN200910272606XA CN200910272606A CN101700957B CN 101700957 B CN101700957 B CN 101700957B CN 200910272606X A CN200910272606X A CN 200910272606XA CN 200910272606 A CN200910272606 A CN 200910272606A CN 101700957 B CN101700957 B CN 101700957B
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glass
edge
laser
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laser apparatus
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CN101700957A (en
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韩建军
张一�
赵修建
周学东
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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Abstract

The invention relates to a method for removing microcrack at glass edges and improving glass strength, which is characterized by comprising the following steps: 1) aligning light spot of a CO2 laser with one edge of glass to be processed; 2) regulating output power of the CO2 laser; 3) regulating the distance between the CO2 laser and the glass edge to be processed and regulating the size of the light spot of the CO2 laser; and 4) regulating moving velocity of the glass to be processed corresponding to the CO2 laser; fixing the CO2 laser, fixing the glass to be processed on a movable platform with an adjustable velocity, and regulating the moving velocity of the movable platform to be 0.05-1mm/s; and respectively processing four edges of the glass to form a glass board with improved strength. The invention can be realized at normal temperature, can perform laser processing on glass edges to remove microcrack without need of preheating the glass board; compared with the traditional methods, the strength of the glass passivated by laser through the method in the invention is improved by about three times, thus satisfying requirement of real application.

Description

Eliminate the method that the glass edge tiny crack improves strength of glass
Technical field
The present invention relates to a kind of method that the glass edge tiny crack improves strength of glass of eliminating.
Background technology
Along with the development of industries such as electronics and special glass, like various types of flat panel display base plate glass and used for solar batteries glass, they to glass require increasingly high.Glasswork needs repeated heating to handle to high temperature, and at this moment the tiny crack at the effect lower glass plate edge of thermal stresses is easy to expand and causes breaking of whole plate face.And the cutting of existing glass generally adopts diamond cutter or wimet break bar to mark indentation one at glass surface, fractures with fracture equipment at last.This method inevitably produces fine crack at glass edge, and glass intensity is declined to a great extent, and can only reach 1/2～1/3 of theoretical numerical value.
In the glasswork transportation and the course of processing, many factors can cause along what its edge began breaking.And because the existence of sharp edges is easy to cause the generation of casualty accident.In order to improve glass intensity and security, be necessary the glass section after the cutting is carried out Passivation Treatment.
Glass treatment method commonly used such as mechanical polishing and chemical rightenning, though minimizing in various degree the section tiny crack, improved glass intensity, to improving the DeGrain of strength of glass, be badly in need of seeking new glassivation treatment process.Laser technology is applied to cut and weld the history in existing more than 30 year of sheet metal, cuts or welds through focused beam local heating material.This flexible method property is good, and economic benefit is high, is widely used in many industries.
At present, cause glass heat to burst, need glass is preheated to 500-600 ℃ for fear of the big temperature difference that causes because of laser radiation, complex process, tooling cost height, and be mainly used in the processing of block silica glass.
Summary of the invention
The object of the present invention is to provide a kind of method that the glass edge tiny crack improves strength of glass of eliminating, this method technology is simple, strength of glass is improved.
The objective of the invention is to realize like this: eliminate the method that the glass edge tiny crack improves strength of glass, it is characterized in that it comprises the steps:
1) with CO 2The hot spot of laser apparatus is aimed at the edge of pending glass;
2) regulate CO 2The output rating of laser apparatus makes CO 2The output rating of laser apparatus is 20-80W;
3) regulate CO 2The distance at the edge of laser apparatus and pending glass, adjusting spot size: the edge of pending glass is placed and CO 2The focus point of laser apparatus is at a distance of the position of 70～140mm, and making the spot size on the edge of pending glass is 3～11mm;
4) regulate pending glassy phase to CO 2The rate travel of laser apparatus: CO 2Laser apparatus is fixed, and pending glass is fixed on the motion platform of adjustable-speed, and the rate travel of adjustment movement platform is 0.05～1mm/s; Handle four edges of glass respectively, form the sheet glass that intensity is improved.
Described step 1) with CO 2The hot spot of laser apparatus is aimed at the edge of pending glass: with CO 2The laser beam that laser apparatus sends and the edge-perpendicular of pending glass, hot spot is aimed at the edge of pending glass, makes hot spot be in the center at the edge of pending glass.
Described CO 2The optimum value of the rate travel of laser output power, spot size and motion platform (being pending glass rate travel) changes between 20～80W, 3～11mm, 0.05～1mm/s respectively with the variation in thickness of different glass system and glass.
Because of glass has the thermal conduction lower than metal, and wavelength is the CO of 10.6um 2Laser output wave band just in time is an atmospheric window, and glass can absorb laser energy consumingly, and in order to obtain the glass edge of non-microcracked or less tiny crack, laser technology capable of using is eliminated the glass edge tiny crack and improved intensity.
The invention has the beneficial effects as follows: with CO 2Laser is the main processing instrument, through with CO 2Laser beam focuses on glass surface and makes its fusing (CO at normal temperatures, 2Laser direct radiation glass edge is eliminated the edge tiny crack), utilize the effect of glass surface tension to eliminate glass edge crackle raising strength of glass.Through control CO 2The output rating of laser apparatus, the size of hot spot, glassy phase can realize the processing to different system glass and different thickness glass to the rate travel of laser apparatus, reach the purpose of passivation; Glass intensity is compared with traditional method after the laser passivation, through CO 2Glass intensity is significantly improved after the laser Passivation Treatment, satisfies the demand of practical application.
Description of drawings
Fig. 1 is an artwork of the present invention;
The edge morphology change synoptic diagram of Fig. 2 A glass before laser treatment;
The edge morphology change synoptic diagram of Fig. 2 B glass after laser treatment;
Among the figure: 1-motion platform, the pending glass of 2-, 3-CO 2Laser apparatus, the 4-laser beam.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with Fig. 1, Fig. 2, embodiment, but content of the present invention not only is confined to following embodiment.
Embodiment 1:
Eliminate the method that the glass edge tiny crack improves strength of glass, it comprises the steps:
1) get the ordinary flat Sodelimesilica Glass, thickness is 5mm, is of a size of 45 * 100mm; The cleaning glass surface removes pollutents such as dust, is fixed on the motion platform shown in Figure 11;
With CO 2The hot spot of laser apparatus is aimed at the edge of pending glass: with CO 2The laser beam 4 that laser apparatus 3 sends and the edge-perpendicular of pending glass 2, hot spot is aimed at the edge of pending glass, makes hot spot be in the center at the edge of pending glass;
2) regulate CO 2The output rating of laser apparatus makes CO 2The output rating of laser apparatus is 60W;
3) regulate CO 2The distance at the edge of laser apparatus and pending glass, adjusting spot size: the edge and the CO that regulate pending glass 2The focus point position of laser apparatus, making the spot size on the edge of pending glass is 3mm;
4) regulate pending glassy phase to CO 2The rate travel of laser apparatus: CO 2Laser apparatus fixed (pending glass is fixed on the motion platform of adjustable-speed); The rate travel of adjustment movement platform is 0.2mm/s; Handle four edges of glass respectively, handle the tiny crack basically eliminate of back glass edge, its edge pattern is shown in Fig. 2 B.Can find out that glass edge is after laser treatment, it is very slick and sly that sharp edges has become, and tiny crack is eliminated.Before the processing, the average flexural strength of tested glass is 70.5MPa, and after laser treatment, its intensity is 115.5MPa.Comparative analysis is through CO 2Glass intensity is significantly improved after the laser Passivation Treatment.
Embodiment 2:
Eliminate the method that the glass edge tiny crack improves strength of glass, it comprises the steps:
1) get the ordinary flat Sodelimesilica Glass, thickness is 3mm, is of a size of 45 * 100mm; The cleaning glass surface removes pollutents such as dust, is fixed on the motion platform shown in Figure 1;
With CO 2The hot spot of laser apparatus is aimed at the edge of pending glass: with CO 2The laser beam 4 that laser apparatus 3 sends and the edge-perpendicular of pending glass 2, hot spot is aimed at the edge of pending glass, makes hot spot be in the center at the edge of pending glass;
2) regulate CO 2The output rating of laser apparatus makes CO 2The output rating of laser apparatus is 40W;
3) regulate CO 2The distance at the edge of laser apparatus and pending glass, adjusting spot size: the edge and the CO that regulate pending glass 2The position of the focus point of laser apparatus, making the spot size on the edge of pending glass is 3mm;
4) regulate pending glassy phase to CO 2The rate travel of laser apparatus: CO 2Laser apparatus fixed (pending glass is fixed on the motion platform of adjustable-speed); The rate travel of adjustment movement platform is 0.1mm/s; Handle four edges of glass respectively; Handle the tiny crack basically eliminate of back glass edge, its edge pattern is shown in Fig. 2 B, and it is slick and sly that sharp glass edge becomes.Before the processing, use the average flexural strength of universal testing machine tested glass to be 66.3MPa, handle the average flexural strength 99.5MPa in back, intensity is significantly improved.
Embodiment 3:
Eliminate the method that the glass edge tiny crack improves strength of glass, it comprises the steps:
1) the plate ultra-clear glasses of making even, thickness is 3mm, is of a size of 45 * 100mm; The cleaning glass surface removes pollutents such as dust, is fixed on the motion platform shown in Figure 1;
With CO 2The hot spot of laser apparatus is aimed at the edge of pending glass: with CO 2The laser beam 4 that laser apparatus 3 sends and the edge-perpendicular of pending glass 2, hot spot is aimed at the edge of pending glass, makes hot spot be in the center at the edge of pending glass;
2) regulate CO 2The output rating of laser apparatus makes CO 2The output rating of laser apparatus is 60W;
3) regulate CO 2The distance at the edge of laser apparatus and pending glass, adjusting spot size: the edge and the CO that regulate pending glass 2The position of the focus point of laser apparatus, making the spot size on the edge of pending glass is 3mm;
4) regulate pending glassy phase to CO 2The rate travel of laser apparatus: CO 2Laser apparatus is fixed; Pending glass is placed on the motion platform of adjustable-speed, and the rate travel of adjustment movement platform is 0.05mm/s, handles four edges of glass respectively; Handle the tiny crack basically eliminate of back glass edge; Form the sheet glass that intensity is improved, its edge pattern is shown in Fig. 2 B, and the glass edge situation obtains changing.Handle the average 72.5MPa of average flexural strength of front glass, that handles back glass on average is bent into 108.8MPa.Through CO 2Glass intensity is improved after the laser passivation.
Embodiment 4:
Eliminate the method that the glass edge tiny crack improves strength of glass, it comprises the steps:
1) the plate ultra-clear glasses of making even, thickness is 8mm, is of a size of 45 * 100mm; The cleaning glass surface removes pollutents such as dust, is fixed on the motion platform shown in Figure 1;
1) with CO 2The hot spot of laser apparatus is aimed at the edge of pending glass: with CO 2The laser beam that laser apparatus sends and the edge-perpendicular of pending glass, hot spot is aimed at the edge of pending glass, makes hot spot be in the center at the edge of pending glass;
2) regulate CO 2The output rating of laser apparatus makes CO 2The output rating of laser apparatus is 80W;
3) regulate CO 2The distance at the edge of laser apparatus and pending glass, adjusting spot size: the edge and the CO that regulate pending glass 2The position of the focus point of laser apparatus, making the spot size on the edge of pending glass is 11mm;
4) regulate pending glassy phase to CO 2The rate travel of laser apparatus: CO 2Laser apparatus fixed (pending glass is fixed on the motion platform of adjustable-speed), the rate travel of adjustment movement platform is 1mm/s, handles four edges of glass respectively, and its edge pattern is shown in Fig. 2 B, and the glass edge situation obtains changing.Handle the average 72.5MPa of average flexural strength of front glass, that handles back glass on average is bent into 110.5MPa.Through CO 2Glass intensity is improved after the laser passivation.
Annotate: the bound value of each processing parameter of the present invention (like output rating, spot size, rate travel etc.), with and interval value, can both realize the present invention.Actual parameter will be regulated according to kind, the size of glass, does not enumerate embodiment one by one at this.

Claims (1)

1. eliminate the method that the glass edge tiny crack improves strength of glass, it is characterized in that it comprises the steps:
1) with CO 2The hot spot of laser apparatus is aimed at the edge of pending glass: with CO 2The laser beam that laser apparatus sends and the edge-perpendicular of pending glass, hot spot is aimed at the edge of pending glass, makes hot spot be in the center at the edge of pending glass;
2) regulate CO 2The output rating of laser apparatus makes CO 2The output rating of laser apparatus is 20-80W;
3) regulate CO 2The distance at the edge of laser apparatus and pending glass, adjusting spot size: the edge of pending glass is placed and CO 2The focus point of laser apparatus is at a distance of the position of 70～140mm, and making the spot size on the edge of pending glass is 3～11mm;
4) regulate pending glassy phase to CO 2The rate travel of laser apparatus: CO 2Laser apparatus is fixed, and pending glass is fixed on the motion platform of adjustable-speed, and the rate travel of adjustment movement platform is 0.05～1mm/s; Handle four edges of glass respectively, form the sheet glass that intensity is improved.
CN200910272606XA 2009-10-30 2009-10-30 Method for removing microcrack at glass edge and improving glass strength Active CN101700957B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103613290B (en) * 2013-11-08 2015-07-08 蚌埠玻璃工业设计研究院 Method for improving strength of glass
CN111875246A (en) * 2020-06-29 2020-11-03 江苏亚威艾欧斯激光科技有限公司 Laser processing system and laser processing method for protective substrate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682003A (en) * 1985-04-03 1987-07-21 Sasaki Glass Co., Ltd. Laser beam glass cutting
CN1491144A (en) * 2001-08-10 2004-04-21 三星钻石工业股份有限公司 Brittle material substrate chamfering method and chamfering device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4682003A (en) * 1985-04-03 1987-07-21 Sasaki Glass Co., Ltd. Laser beam glass cutting
CN1491144A (en) * 2001-08-10 2004-04-21 三星钻石工业股份有限公司 Brittle material substrate chamfering method and chamfering device

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