Year

2018

Degree Name

Master of Research

Department

School of Mechanical, Materials, Mechatronic and Biomedical Engineering

Abstract

Various lubrication conditions have been investigated comprehensively on conventional deep drawing process, while the open and closed lubricant pockets theory and frictional size effects have been dispossessed micro deep drawing process to obtain benefits of lubrication conditions. Correspondingly, proper lubrication conditions have attained a severe concern in microforming. To superior advantages of microforming, including light and cost-effective parts, in this study, magnesium (Mg)-lithium (Li) alloy, which is an ultralight alloy, was nominated to form lightweight micro-cups with outstanding ductility. The Mg-Li is a relatively novel material in microforming. Accordingly, studies were conducted in-depth to determine the mechanical properties by various heat-treatments. Furthermore, the aluminium (Al)-copper (Cu) composite material was utilised to boost micro-cups properties. The conventional lubricants were exploited as the benchmarks to study influences of a novel lubricant, called 1 wt% TiO2 oil-based nanoparticle lubricant, for the Mg-Li alloy and Al-Cu composite materials in the micro deep drawing process. Finite Element Method (FEM) was accompanied, and the experimental and simulation results were in a good agreement. The novel nano-particle lubricant illustrates high performance to reduce the drawing force and improve the micro-cups quality. Moreover, the nano-particles resolved in the lubricant is capable of mitigating the frictional size effects.

FoR codes (2008)

0902 AUTOMOTIVE ENGINEERING, 0910 MANUFACTURING ENGINEERING, 0913 MECHANICAL ENGINEERING, 0915 INTERDISCIPLINARY ENGINEERING

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Unless otherwise indicated, the views expressed in this thesis are those of the author and do not necessarily represent the views of the University of Wollongong.