Glass laser cutting technology

As a kind of advanced processing technology, laser cutting has been widely used in industrial production. Generally, metal is the main target of laser cutting. Other materials include plastic, ceramic, silicon wafer and glass. Today’s main content is CO2 laser cutting glass technology, laser cutting glass technology has the following characteristics 1. Glass absorbs infrared lasers much better than metal, and glass is a poor conductor of heat, requiring low laser power 2. Laser-cut glass has smooth edges, no lateral micro-cracks, no debris, reduces the possibility of scratches on the board and the possibility of glass breakage. 3. Laser cutting technology can be applied to the production of flat panel display, automotive glass, float glass laser Principle of laser cutting of glass 1. Glass absorption of laser light High absorption rate when the laser wavelength is greater than 5 um The CO2 laser has a wavelength of 10.6 um, which is ideal for cutting glass. Most of today’s laser cutting equipment has a power of 100~500 W sealed off CO2 laser. Semiconductor lasers and Nd:YAG lasers with a wavelength of around 1 μm can also be used for laser cutting, but the cutting principle is different. Laser cutting glass technology is stress cutting, cutting metal is melt cutting 2. Glass cutting process of CO2 laser Glass cutting mostly uses sealed off-type CO2 lasers with output power between 100 and 500 W. Precise control of the temperature distribution of the glass, laser cutting process for excellent cutting edges, smooth and flat When cutting, the higher the power, the better. Pay attention to not making the glass surface reach the softening point of the glass. Therefore, for the cutting of different glasses, it is not necessary to focus on the glass surface, and the defocusing method is used to focus the laser. A few centimeters below the glass plate, the spot of the glass plate is oval Three factors that determine the cutting speed: the output power of the laser, the thickness of the glass, and the thermal expansion coefficient of the glass. 3. Glass cutting of disc laser A reflector is disposed between the glass and the laser head to allow the laser to pass through the glass multiple times, improving laser utilization. Can cut flat glass and glass tube, can be cut in one time without breaking process