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Parametric study of laser cutting of carbon fibre reinforced polymer (CFRP) and the effect of fibre orientation on cutting quality
摘要： Laser cutting of CFRP was performed using 2 kW fibre laser. A detailed analysis of the effect of various laser processing parameters on the cutting of CFRP was carried out. The present work considers mainly laser power (W), scan speed (mm/min), gas pressure (bar) and duty cycle (%) as the process parameters with average kerf width and heat affected zone (HAZ) as the output parameters. Cutting of the fibres at 90o with respect to fibre orientation was performed. The SEM and EDS analysis were also performed to understand the cut quality, matrix melting, fibre pullout and vaporisation phenomena of the matrix in the heat affected zone (HAZ). Laser cutting of CFRP with a minimum kerf width of around 184 μm was observed for 800 W, 600 mm/min, 3 bar and 25% duty cycle while HAZ in this parameter was around 1561 μm. Kerf width and HAZ directly increase with an increase in laser power, gas pressure and duty cycle, but they reduce with increase in scan speed. SEM images confirm that the CFRP cutting process generates relatively burr-free fibre edges. Matrix recession and delamination (fibre pullout) were identified as the major quality defects occurring in the laser cutting process of CFRP.
关键词： fibre delamination,matrix melting,heat affected zone,laser cutting,fibre consolidation,kerf width,CFRP
更新于2025-11-28 14:24:20
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Microchannel fabrication and metallurgical characterization on titanium by nanosecond fiber laser micromilling
摘要： Laser micromilling technique is used to manufacture microchannel on metals and nonmetals. Microfeatures ≤100 μm are still challenging for fabrication by common methods. Nanosecond fiber laser micromachining has become more popular owing to its prospective implementation in laser micromilling. Microchannel application relies on its geometric dimension, profile, and surface quality. In this study, an attempt was made to explore the impact of process parameters scanning times, scanning velocity, pulse repetition rate, and assist gas pressure on top kerf width, taper, surface roughness, and metal removal rate in laser micromilling experimentally. Microchannel width varied between 45.5 and 70.9 μm. A regression model has been developed for each response. ANOVA (analysis of variance) has been carried out to remove insignificant parameters. Thermal stress analyzed by surface cracks inside microchannel by Scanning Electrone Microscopy (SEM) images. Higher PRR, lower no. of scans, higher scanning speed and high air pressure found suitable for lesser surface cracks. Redeposition observed at slower scanning velocity and minimum scanning times. Oxidation zone from boundary of channel varies between 37 and 58 μm. Oxide formed on Ti surface which increases oxygen content toward center of channel from 51.08 to 76.22% compared to outside surroundings.
关键词： oxidized zone,MRR,kerf width,LMM,surface cracks,taper,surface roughness,recast layer
更新于2025-09-19 17:13:59
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CO2 Laser Cutting Performance on Ultra High Strength Steel (UHSS)
摘要： Evolution of a new breed steel, Ultra High Strength Steel (UHSS), has been adapted by the automotive industry after being used for heavy trucks. Higher tensile strength and improved mechanical properties of UHSS are the main reason for its selection particularly in Body In White (BIW) construction at critical chassis area. Laser cutting process is noted as the final trimming method for this harden material as die pressing resulted as an ineffective process. UHSS cutting performance using CO2 laser with variation on laser power, cutting speed, assist gas type and assist gas pressure was determined to identify the effect of these parameters on the cutting quality. Cutting quality assessment was carried out according to EN ISO 9013 standard where kerf width, perpendicularity and microhardness were evaluated based on parameters set at 1.7 mm thickness of 22MnB5 UHSS boron steel. The quality of these cuttings was evaluated as the results show that thermal exposure dependent on energy density and gas type reflect the outcome where higher thermal exposure introduced bigger kerf with better perpendicularity. It was also found that isothermal effects such as Heat Affected Zone (HAZ) and martensitic transformation were also clearly visible since nitrogen produced a better cutting quality and material integrity consumption at the cutting edge.
关键词： Perpendicularity,22MnB5,Microhardness,CO2 laser,Kerf width
更新于2025-09-19 17:13:59
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Multi-Objective Optimization of Cutting Parameters during Laser Cutting of Titanium Alloy Sheet using Hybrid approach of Genetic Algorithm and Multiple Regression Analysis
摘要： Now a day’s advance engineering materials are playing a key role in the field of aeronautics, defense and medical. Titanium and its alloys are one of the advanced engineering materials that have great demand in the various fields of industries due to its greater behavior and better mechanical properties. These applications require precise and better quality cuts which may not be obtained by conventional machining processes due to the unfavourable properties of Ti and its alloys. This problem may be minimized by using laser cutting process. In this study, the Advanced 300 W Nd:YAG Laser cutting system has been applied for the cutting of titanium alloy sheet. The point of current research is to optimize kerf width and kerf deviation, simultaneously during the laser cutting of Titanium alloy sheet (Grade 5).The multiple regression analysis has been applied for developing the second order regression models of kerf width and kerf deviation. The optimization technique genetic algorithm has been applied for the multi-objective optimization of the developed models. The comparison results show an improvement of 29.78% for kerf width and 95% for kerf deviation, respectively. The overall percentage improvement of 27.39% has been found by considering the equal importance of both quality characteristics. The parametric effects on quality characteristic have been also discussed.
关键词： Multiple Regression Analysis,Kerf Deviation,Laser cutting,Hybrid Approach,Kerf Width,Genetic Algorithm
更新于2025-09-16 10:30:52
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Optimization of CO 2 Laser Cutting of Stainless Steel Sheet for Curved Profile
摘要： Laser cutting is one of the most widely used thermal energy based non-contact type advance machining process. In recent years, considerable experimental investigations have been carried out aiming at improving laser cutting process performance. In this work CO2 laser cutting parameters on stainless steel 304 width 2.5 mm thickness were studied. The cut quality achieved minimum kerf width to cut stainless steel sheet depends on appropriate selection process parameters was investigated. The parameters consider to include laser output power, cutting speed, gas pressure. The effect of cutting parameter on the cut quality was further investigated by monitoring top kerf width, and bottom kerf width using box –behnken designing the response surface methodology. And finally optimized best CO2 laser cutting parameters are selected by using genetic algorithm approach.
关键词： Kerf width,Stainless steel 304,CO2 Laser cutting,GA,RSM
更新于2025-09-16 10:30:52