Redesign and Optimization of Injection Molding Machine Stationary Platen

Abstract

Injection molding machine is one of the most widely used method of conversion of plastic into various end products applicable to various plastic materials from plastic commodity to specialty engineering plastic. Stationary platen is a critical component of plastic injection molding machine. During clamping of molds, force is produced against the face of platen which will result in defor- mation of platen concavely. The platen also includes tie bars at each corner. As a result of bending of the platen, tie bars also resulting in uneven loading. The uneven loading results the premature failure of tie bar which can lead to the breakdown of the machine. The aim of the project is improvement in the design i.e. to eliminate the dome shape of 910 Ton stationary platen and make it fat, also increase injection unit entrance hole diameter and optimize the modified model. The work presented includes finite element analysis, fatigue analysis, design modifications and optimization of Injection Molding Machine Stationary Platen. For 910T, finite element analysis is carried out and stress value is compared with accep- tance criteria. For finite element based fatigue analysis of 910T, the life of platen checked for design life. For improvement in design modification is carried out. After design modifications, finite element analysis and fatigue analysis is carried out and checked with an acceptance limit of stress and design life. The design modification will be followed by the optimization of the model.