Multi-Objective Optimization of Squeeze Casting Process using Evolutionary Algorithms

Multi-Objective Optimization of Squeeze Casting Process using Evolutionary Algorithms

Manjunath Patel G C (Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, India), Prasad Krishna (Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, India), Mahesh B. Parappagoudar (Department of Mechanical Engineering, Chhatrapati Shivaji Institute of Technology, Bhilai, India) and Pandu Ranga Vundavilli (School of Mechanical Sciences, Indian Institute of Technology, Bhubneswar, India)
Copyright: © 2016 |Pages: 20
DOI: 10.4018/IJSIR.2016010103
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Abstract

The present work focuses on determining optimum squeeze casting process parameters using evolutionary algorithms. Evolutionary algorithms, such as genetic algorithm, particle swarm optimization, and multi objective particle swarm optimization based on crowing distance mechanism, have been used to determine the process variable combinations for the multiple objective functions. In multi-objective optimization, there are no single optimal process variable combination due to conflicting nature of objective functions. Four cases have been considered after assigning different combination of weights to the individual objective function based on the user importance. Confirmation tests have been conducted for the recommended process variable combinations obtained by genetic algorithm (GA), particle swarm optimization (PSO), and multiple objective particle swarm optimization based on crowing distance (MOPSO-CD). The performance of PSO is found to be comparable with that of GA for identifying optimal process variable combinations. However, PSO outperformed GA with regard to computation time.
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Introduction

Hybrid squeeze casting process has been developed by combining the distinguished features such as strength, integrity, economic, and design flexibility of conventional casting (gravity and die casting) and forging processes (Rajgopal, 1981). The technical benefit of the squeeze casting process over conventional casting and forging process cited in the literature (Rajgopal, 1981; Ghomashchi & Vikhrov, 2000) are near net-shape castability, simpler tooling construction, high productivity, refined structure, improved surface finish, heat-treatability, minimum porosity and segregations, ability to cast ferrous, non-ferrous and wrought alloys. Hence, the squeeze cast parts are used in automobile parts, namely piston, cylinder, clutch housing, brake drum, engine block, connecting rod, wheels, suspension arm, hubbed flanges, barrel heads, truck hubs, and so on (Rajgopal, 1981; Ghomashchi & Vikhrov, 2000; Krishna, 2001).

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