Parameter Optimization of WC-TaC-6Co Green Part in Injection Moulding using Taguchi Method

Abstract

This study represents the injection moulding parameters optimization via Taguchi method on density and porosity of the green part of cemented carbide WC-TaC-6Co. The experiment commences with the preparation of WC-TaC-6Co feedstock mixed with 60 % palm stearin (PS), and 40 % of low-density polyethylene (LDPE). The important parameters for this study are the percentage of grain growth inhibitor (GGI), temperature of injection, injection pressure and injection speed. Utilizing orthogonal array L9 (34), signal to noise ratio (S/N) was used to determine the significant levels and its contribution to the responses of density and porosity. The study signified that for density and porosity response, injection pressure and GGI is the most influential parameters. Based on that, it was found that the best parameter combinations for density and porosity is, GGI at 1.2 wt. %, temperature of injection at 155°C, injection pressure at 55% and 50%, and injection speed at 40% and 30%. Thus, it is determined that by controlling the setting of the best parameter, the optimal quality of the desired product can be accomplished and sustained without much complications during the process.