Parametric Dependence of Thermal Field in Laser Turning | #Sciencefather #Researcherawards
Introduction
Laser-assisted turning (LAT) has emerged as a promising technique to enhance the machinability of difficult-to-cut alloys like GH 4169 by utilizing localized thermal softening induced through laser preheating. This study focuses on understanding the influence of laser processing parameters on the thermal field during the preheating process of LAT. By combining finite element (FE) simulation with experimental validation, the research aims to optimize the machining parameters to achieve improved efficiency, reduced tool wear, and superior surface quality.
Finite Element Modeling of LAT for GH 4169
A 2D finite element (FE) model is established to simulate the laser-assisted turning of GH 4169, enabling the detailed investigation of thermal field evolution. The model incorporates material properties, boundary conditions, and heat absorption characteristics to predict the influence of laser parameters on the peak and final preheating temperatures. This computational approach provides an essential foundation for correlating simulation results with experimental findings.
Calibration of Absorption Coefficient
To ensure the accuracy of the simulation, the absorption coefficient of GH 4169 for a 1064 nm wavelength laser is experimentally determined and calibrated with FE results. This calibration is critical since the absorption rate directly impacts the distribution of laser energy within the material and thus the heating efficiency. Establishing a reliable coefficient ensures realistic thermal field predictions.
Influence of Laser Processing Parameters
The study systematically investigates the influence of laser power, spot diameter, spot movement speed, and spot–tool edge distance on the thermal field. Results indicate that laser power, movement speed, and spot diameter significantly affect both peak and final preheating temperatures, while the spot–tool edge distance primarily influences the final temperature. These insights highlight the sensitivity of LAT to parameter selection.
Regression Analysis and Optimization
Regression equations are developed to describe the relationship between laser parameters and thermal field responses. By integrating boundary conditions—such as maintaining peak temperatures between 650–950 °C and initial preheating below 190 °C—the optimal parameter set is derived. This optimization framework bridges simulation and practice, ensuring controlled heat input for effective turning.
Comparative Performance Evaluation
Comparison experiments between conventional turning (CT) and optimized LAT reveal significant improvements in cutting force reduction, tool flank wear, and surface roughness under optimized parameters. These findings validate the effectiveness of LAT when laser parameters are rationally chosen, confirming its role as a superior machining strategy for high-strength alloys like GH 4169.
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#Sciencefather, #Reseachawards, #LaserAssistedTurning, #GH4169, #FiniteElementAnalysis, #ThermalField, #LaserProcessing, #MachiningOptimization, #CuttingForces, #SurfaceQuality, #ToolWearReduction, #AdvancedManufacturing, #LaserMachining, #AerospaceMaterials, #HeatTransferSimulation, #PreheatingEffects, #LaserPower, #SpotDiameter, #ProcessingParameters, #MetalMachining, #MaterialScience, #ManufacturingInnovation,
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