CDA Research Improves Soundness of Rotor Die Castings - It is not unusual for die castings to display some degree of porosity due to the rapid and turbulent flow of metal into the mold cavity. For most products, small amounts of porosity are tolerable from the standpoint of mechanical behavior, but the situation is quite different in the case of motor rotors. Here, porosity control is particularly important because even tiny voids can diminish the advantages offered by copper's high volumetric electrical conductivity. Large voids, which generally appear in the rotor's end rings, are also detrimental since they can make the rotor difficult to balance. MORE >> This article is based on a paper entitled "Porosity Control in Copper Rotor Die Castings" by E.F. Brush Jr., S.P. Midson, W.G. Walkington, D.T. Peters and J.G. Cowie. It was presented at Die Casting in the Heartland, September 2003, and published as paper No. 46 in the North American Die Casting Association (NADCA) 2003 Transactions. Reprints of the paper, Porosity Control in Copper Rotor Die Castings - NADCA 2003, can be downloaded by clicking here.

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