The Influence of Pressure Die Casting Parameters on the Castability of AlSi11-SiCp Composites

Abstract

The paper presents the method of preparing a composite slurry composed of AlSi11 alloy matrix and 10 vol.% of SiC particles, as well as the method of its high-pressure die casting and the measurement results concerning the castability of the obtained composite. Composite castings were produced at various values of the piston velocity in the second stage of injection, diverse intensification pressure values, and various injection gate width values. There were found the regression equations describing the change of castability of the examined composite as a function of pressure die casting process parameters. The conclusion gives the analysis and the interpretation of the obtained results.

Experimental and numerical study of section restriction effects on filling behavior in low-pressure aluminum casting

“…More developed energetic models (Flemings et al, 1961) or hydraulic models (Luk and Darvell, 1992) also directly link casted length and metal velocity. The importance of filling velocity on misrun was experimentally confirmed in aluminum gravity castings (Flemings, 1964) but also in aluminum composite LPC (Konopka et al, 2015) and magnesium alloy LPC for plates (Sadayappan et al, 2006), bars (Laws et al, 2006) or tubes (Sanitas et al, 2017). Moreover, the filling time in LPC has a great influence on grain size and final mechanical properties (Fu et al, 2008).…”

Research and Evaluation of the Influence of the Construction of the Gate and the Influence of the Piston Velocity on the Distribution of Gases into the Volume of the Casting

“…Decreasing of pressing velocity can cause the melt flow to become calmer by means of which continual and regular face of the melt flow can be reached along the entire cross-section of the gate not entrapping the gas or air in its volume. On the other hand, in this it is assumed that prolongation of the casting cycle at low pressing velocity results in reduction of the melt temperature due to long period of duration of die casting cycle which leads to other defects such as cold laps and weld lines [ 3 , 10 , 11 , 12 ].…”

“…Regardless of technological parameters the key factor influencing the air entrapment in the melt volume is a correct structure of both the gating and the venting system of the mold [ 12 , 13 , 14 ]. Reaching the high quality of die casting depends on the filling mechanism of the mold cavity by the molten metal.…”

UQ eSpace

“…This not only ensures that the fibres are not put under undue stresses by the flow of molten metal, it also works to prevent dislodgement of the fibres from the preform and reduce infiltration defects in the solidified material (Long, et al, 1993). As has been investigated by Konopka et. al.…”

“…al. (2014), by placing the gate along the fibre axis, with the squeeze force being applied perpendicular to this axis, this can be effectively achieved (Konopka, et al, 2014).…”