DESIGN AND ANALYSIS OF PLASTIC MOULDING DIE AND RUNNER SHAPE OPTIMISATION USING AHP METHOD

Abstract

Injection moulding is the most widely used method for the production of intricate shape plastic parts with good
dimensional accuracy. The design of a plastic moulding die is of critical importance for product quality and for
efficient processing, it is also an integral part of plastic injection moulding as the quality of final plastic part is
greatly reliant on injection mould die. The 3D Virtual Model of the moulding die and the core-cavity extraction was
performed using the Auto Desk inventor software. The 2D manufacturing drawings were also drafted in Auto Desk
Inventor. ANSYS software is used for mould flow analysis and optimum selection of different runner cross section.
This work can also be further extended for a detailed stress and fatigue analysis for the core and cavity inserts to
obtain better tool life by using ANSYS Workbench. There are various cross sections for the runner of mould design
so the best runner cross section is the criteria for the optimization. Here we select the runner cross section by using
the analytical hierarchy process.by using this method we arrived at particular solution of the multivariable problem
and this method gives the optimum result. The main objective of this of this paper is to develop the relationships
among the identified injection moulding parameters using AHP and pair wise comparisons of the element (usually,
alternatives and attributes) can be established then can be translated into priority weights (scores).