Influence of Casting Process Parameters on Surface Roughness in Hot-Chamber Die Casting of AZ91D
Cast magnesium AZ91D, used for cases, covers and housings, for consumer electronics faces increased requirements on aesthetically pleasing surfaces. The casting conditions have strong effect on as-cast surface roughness for thin-walled castings. This is currently not well understood. In the current study surface roughness was measured parallel and perpendicular to the filling direction and on both sides on straight flat thin speci¬men. The parameters studied were First and Second phase injection speed, Cooling time, and Melt temperature. The Fix and Moving side die tempera¬tures were varied, with the fix side was kept hotter. A D-Optimal experimental design was used resulting in 31 different settings. The re¬sults showed that roughness was decreased by mini¬mizing the temperature difference between the two die halves, increasing cooling time and first phase injection speed. Increasing the second phase injection speed increased roughness.
B.S.S. Daniel and G.P. Chaudhari
A. E.W. Jarfors, "Influence of Casting Process Parameters on Surface Roughness in Hot-Chamber Die Casting of AZ91D", Advanced Materials Research, Vol. 585, pp. 349-353, 2012