Research On Cutting Quality Of Float Glass By 532nm Nanosecond Laser

Ultra-white float glass has low iron content and good light transmittance,and is widely used in solar battery protection backsheets.The traditional method of cutting glass has many processes and low efficiency,and there are pollution problems such as processing chips,noise,oil stains,etc.,while laser cutting is a non-contact processing with high cutting accuracy,narrow slits,fast speed,and smooth cutting surface,which is more suitable for glass Complex shape processing.Researchers at home and abroad have done a lot of research on the process of laser cutting brittle materials,but the process and mechanism of cutting float glass are relatively shallow.Research on the laser cutting process of float glass is of great significance to the photovoltaic glass processing industry.This paper first introduces the research background and significance,and compares and analyzes the current research status of laser cutting for brittle materials at home and abroad.Aiming at the characteristics of float glass laser cutting,a 532 nm nanosecond laser cutting processing platform for float glass was built.The bottom-up concentric circle cutting method was adopted.Four process parameters that had a greater impact on the cutting quality were selected,and the entire design was designed.Factor orthogonal test.The product qualification rate and quality are used as evaluation indicators,and the cut hole drop rate and the edge chipping amount of the cut hole surface are selected as the characterization objects.The drop condition of 256 sets of tests and the edge chipping amount of the upper and lower surfaces are recorded,and the laser repetition frequency,Cutting speed,concentric circle spacing and Z-direction feed affect the cutting hole drop rate and edge chipping amount.The main effect and interaction analysis of the process parameters show that the laser repetition frequency and scanning speed have the greatest impact on the drop rate,and the drop rate is the highest at 40KHz;the amount of chipping on the lower surface of the cut hole is significantly smaller than that on the upper surface.The amount of edge chipping on the surface is most affected by the laser repetition frequency,and the amount of edge chipping on the lower surface is most affected by the scanning speed and the distance between concentric circles.Study the effect of temperature gradient on the quality of laser cutting of float glass.Use ANSYS APDL language to load the double ellipsoid heat source on the glass,and simulate and analyze the influence of the laser repetition frequency,cutting speed,concentric circle spacing and Z-direction feed parameters on the temperature distribution,revealing the mechanism of laser cutting on float glass by the temperature gradient,and it is consistent with the test results.