D. J. Sanghvi College of EngineeringD. J. Sanghvi College of EngineeringD. J. Sanghvi College of Engineering
Khavekar Rajendra;Hari Vasudevan;Gosar Vimal
Manufacturing process can be optimized to obtain better quality of the products manufactured by particularly reducing the defects. In this study, application of a design of experiments (DOE) tool i.e., response surface methodology (RSM) was carried out on parameters of injection moulding of polybutylene terephthalate (PBT) material. The influences of process parameters are injection pressure, suck back pressure, injection time, cooling time, zone 1 temperature and zone 2 temperature (barrel temperatures) on dark-spots and short-shots (defects) considered under the investigation. Orthogonal array L16 of Taguchi method was used to screen six factors at two levels each with the response being%defectives. It was found that the injection pressure, injection time and zone 1 temperature had a major effect on the response. Central composite design of RSM was then applied to investigate further tuning of the parameters: injection pressure, injection time and zone 1 temperature. It was found that the reduction in%defectives had been reduced to 3.00% from 9.22%.