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<p>The laser cutting of float glass utilizing a controlled fracture method results in deviations in the cut path at both the leading and trailing edges of the glass sheet. Thermal stresses are employed in the controlled fracture method to initiate the crack, allowing the material to separate along the designated cutting route by propagating the crack. Cut path deviation near the edges results due to non-uniformity and elevated magnitudes of thermal stresses. The thermal stresses induced by laser scanning are significantly influenced by the geometry of the laser beam. No studies have been reported on the effect of laser beam geometry in CO<sub>2</sub> lasers that generate surface absorption during glass cutting. This research examines the influence of various laser beam geometries on thermal stress distribution during CO<sub>2</sub> laser cutting of float glass and its impact on the levels of thermal stresses produced around the margins of the glass sheet. The thermal stress and temperature distribution were simulated using the finite element analysis software, Abaqus. Compared to other beam geometries, the plus beam configuration yields a uniform stress distribution throughout the thickness and reduces tensile stress magnitudes at the top, centre, and bottom sections of the leading and trailing edges of the glass sheet, facilitating stable crack propagation and minimizing cut path deviation. </p>

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Optimization of Laser Beam Geometry for Controlling Thermal Stresses in CO2 Laser Glass Cutting

  • 期刊论文

  • 发表日期：

    2025年3月19日

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  • Salman Nisar

摘要

The laser cutting of float glass utilizing a controlled fracture method results in deviations in the cut path at both the leading and trailing edges of the glass sheet. Thermal stresses are employed in the controlled fracture method to initiate the crack, allowing the material to separate along the designated cutting route by propagating the crack. Cut path deviation near the edges results due to non-uniformity and elevated magnitudes of thermal stresses. The thermal stresses induced by laser scanning are significantly influenced by the geometry of the laser beam. No studies have been reported on the effect of laser beam geometry in CO2 lasers that generate surface absorption during glass cutting. This research examines the influence of various laser beam geometries on thermal stress distribution during CO2 laser cutting of float glass and its impact on the levels of thermal stresses produced around the margins of the glass sheet. The thermal stress and temperature distribution were simulated using the finite element analysis software, Abaqus. Compared to other beam geometries, the plus beam configuration yields a uniform stress distribution throughout the thickness and reduces tensile stress magnitudes at the top, centre, and bottom sections of the leading and trailing edges of the glass sheet, facilitating stable crack propagation and minimizing cut path deviation.