Multiple-objective optimization in precision laser cutting of different thermoplastics. (April 2015)

• Record Type: Journal Article
• Authors: Tamrin, K.F.; Nukman, Y.; Choudhury, I.A.; Shirley, S.
• Is Part Of: Optics and lasers in engineering. Volume 67(2015)
• Page Start: 57
• Page End: 65
• Publication Date: 2015-04
• Subjects: Laser cutting -- Thermoplastic -- Grey relational analysis -- Optimization; Lasers in engineering -- Periodicals; Optical measurements -- Periodicals; Optics -- Periodicals; Lasers en ingénierie -- Périodiques; Mesures optiques -- Périodiques; Optique -- Périodiques; 621.36605
• DOI: 10.1016/j.optlaseng.2014.11.001
• Languages: English
• ISSNs: 0143-8166

Abstract

Abstract: Thermoplastics are increasingly being used in biomedical, automotive and electronics industries due to their excellent physical and chemical properties. Due to the localized and non-contact process, use of lasers for cutting could result in precise cut with small heat-affected zone (HAZ). Precision laser cutting involving various materials is important in high-volume manufacturing processes to minimize operational cost, error reduction and improve product quality. This study uses grey relational analysis to determine a single optimized set of cutting parameters for three different thermoplastics. The set of the optimized processing parameters is determined based on the highest relational grade and was found at low laser power (200 W), high cutting speed (0.4 m/min) and low compressed air pressure (2.5 bar). The result matches with the objective set in the present study. Analysis of variance (ANOVA) is then carried out to ascertain the relative influence of process parameters on the cutting characteristics. It was found that the laser power has dominant effect on HAZ for all thermoplastics. Highlights: A CO2 laser is used to precisely cut PMMA, PC and PP substrates. Grey relational analysis determines multiple quality characteristics of the cuts. The optimal cut is achieved at low power, high cutting speed and low compressed air pressure. Laser power has dominant effect on HAZ for all thermoplastics.