Table of Contents

ABSTRACT

In the gravity die casting process the metal enters the mould under gravity. Despite recent innovations and advances in die casting technology that have significantly expanded the products, the development of complementary new alloys. The documentation of reliable properties data for these new alloys has all categorically lagged behind. The pouring of molten metal into the mould and its subsequent filling are quite critical steps in metal casting, since the behavior of the liquid metal and its freezing determine whether the cast shape will be properly formed and free from defects. In the present work, the Al-Si-Mg alloys are considered to investigate the casting and mechanical characteristics with respect to gravity die casting process. The following areas have been identified and selected for the analysis of gravity die casting process from Al-Si-Mg alloys: The solidification time of these alloys in the die casting process mould increases with increase in the pouring temperature of melt, decreases with increase in the pre-heat temperature of mould. It has been found that the Si content in the alloy reduces the freezing range whereas the Mg content widens it. Sufficient degasification of the melt improves the solidification process.

Keywords: gravity diecasting, Al-Si-Mg alloys, solidification, Taguchi techniques