Solution of Laser Cutting glass
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- source:BREDA CNC Machining
The laser of 6 micron, so almost all laser energy by vitreous surface 15 micron absorb a place, relative to vitreous surface mobile laser spot forms requires cut line. Choose appropriate floating rate, assure to already enough laser quantity of heat forms local stress grain appearance to distributing on glass (the cut line of set) , won't melt glass again at the same time. Another crucial part in Laser Cutting is internal heat of temper by dipping in water (water) the mouth, as the shift of laser spot, internal heat of temper by dipping in water (water) mouth general cold air (water) blow vitreous surface, undertake quenching quickly to be heated area, vitreous general along stress the largest direction generation ruptures, depart glass along the direction of set thereby. Those who need a specification is, to cause glass generation ruptures, need is cutting the initiative crack with the start tiny lay off of secant with rigid standard above all. The treatment parameter such as speed of scanning of the laser power with different choice, spot, stress is brought send rupture deepness can amount to 100 micron to arrive several millimeter, mean use laser standard but deepness of one pace cut arrives for 100 micron the glass of several millimeter. Because this process relies on heat to cause mechanical stress, rupture the coefficient of expansion of deepness and cut speed and material itself is very relative. Say commonly, the coefficient of expansion of the glass that applies to laser method to have cut is the smallest should be 3.
2x10-6K-1, what what I hope is, most and common glass satisfies this requirement. Result and application and traditional mechanical patterning method are compared, this kind of new method has a few main good points. Above all, this is one pace can finish, dry treatment process. The brim is smooth and orderly, do not need follow-up cleanness and polish. And, laser brings the separate course that send to generate the margin of high strenth, natural temper, without tiny crack. Use this kind of method, avoided the crack that cannot expect and broken, lowered defect rate, raised yield. Qualitative description is in brim quality a piece 1.
The glass with 5 thick millimeter piece get on 3 to cut the dynamic difference between mark differently. The brim of vitreous cut does not have lobation and crack completely, do not need sequel to handle process. Because laser dispute contacts a tool, do not have a tool wear away problem, can assure to last thereby, even cut ply and brim quality. As quite, 3 (B) showed use metal annulus the edge that has cut, can see along cut the line is put in all sorts of leftover tension component. 3 (C) the result that is cut of diamond emery wheel, can see a lot of tiny dehiscent fruit, to a lot of application, need burnish cut margin. To evaluate brim quality mensurably, according to ISO3274, should use Stylus outline measuring instrument to undertake metrical to the brim of Laser Cutting. Authority is measured show, average surface roughness (Ra) be less than 0.
5 micron. Brim intensity because brim quality is fine, and heat / quench the natural temper effect in the process, the brim intensity of Laser Cutting is very high. The Otto-Schott-Insititut institute of Jena did independent test according to DIN5230011 parameter, relevant data is released publicly already. Use this kind of new method, after be being machined with rigid standard the sample photograph of burnish is compared, brim intensity rose 30% the left and right sides. Of ply and speed of cut of cut speed limit have 3 factors: The hot coefficient of expansion of vitreous ply, material, and the output power of laser. In this test, the A=7 of CO2 laser cut that we use 150W to output power.
2 X 10-6, ply is 1.
The glass of 1mm, sharp cut, speed is 500mm/ second. As quite, horniness metal annulus cut is similar the speed of akin glass can amount to ply 1500mm/ second. But, even if in the application that pays attention to speed, the economy that this differentia different also will be brought by Laser Cutting place and place of quality dominant position are made up for. In the meantime, we believe, farther treatment process is optimized and it is easy that the laser that uses higher output power undertakes cut is met the land raises treatment rate 2 to 3 times. Curvilinear cut because crack is the accurately trace along lay off of place of laser light beam, laser brings the depart that send to be able to cut the curvilinear pattern with very exact lay off. In fact, no matter,the test that we do also proved linear or it is a curve, laser Cutting can continuously, complete set design accurately, repeatability can be amounted to + 50 μ M. So laser can have the accurate cut of curve and three-dimensional graph. Apply in the long run, laser brings the detached technology that send to will be in the cut application of a lot of glass replace mechanical method. The near future, laser Cutting already indicated powerful technical dominant position in undermentioned 3 application domain, they are: CRTS, flat shows, and the windscreen glass of the car the cut that wait. Some application need to undertake to glass special follow-up is handled, for instance, beard of component of certain and safe glass is handled via temperature sclerosis, and the flat monitor component of the most film that take silicon must pass temperature anneal to wait. Laser is brought send separation process to also cooperate these special aftertreatments, we use laser method cut the glass with 100 thick 4mm piece, in process of special heat treatment, do not have to be destroyed. CNC Milling CNC Machining