Due to the complexity of squeeze casting process, it is very difficult to measure the internal pressure of squeeze casting process by experiment; however, the results of pressure transfer obtained by simulation are lack of direct experimental data support; at present, there is no report on the systematic and in-depth study of pressure transfer law of squeeze casting process by combining simulation and experiment.
Based on the established method to obtain the interface heat transfer coefficient and interface pressure, a large number of squeeze casting experiments were carried out to obtain the quantitative data of interface heat transfer coefficient and interface pressure, which provided the basis for the study of pressure transfer law in squeeze casting process. In this chapter, the numerical model based on ANSYS program and the interface heat transfer coefficient model are used to simulate the pressure transfer in the solidification process of squeeze casting. Through the combination of experiment and numerical simulation, the law of interfacial pressure transfer in squeeze casting process was studied, and the sensitivity of interfacial pressure transfer to casting material was analyzed by taking A356 aluminum alloy and gw103k magnesium alloy as examples.
Through the combination of experiment and numerical simulation, the law of pressure transfer in squeeze casting process was studied
(1) The experimental results show that under the same experimental conditions, the peak value and duration of interfacial pressure of aluminum alloy are significantly higher than that of magnesium alloy; in addition, the maximum error between experimental results and simulation results is about 6.2%, and the simulation results are accurate and reliable.
(2) The effects of solidification process and mechanical properties of materials on pressure transfer were revealed by numerical simulation. The latent heat of magnesium alloy is less than that of aluminum alloy, which makes the solidification time of magnesium alloy faster and the deformation resistance of magnesium alloy greater. These are the main factors leading to the large difference of interface pressure between magnesium alloy and aluminum alloy.
(3) Due to the large deformation resistance of magnesium alloy, compared with aluminum alloy, the ability of magnesium alloy to compensate volume shrinkage by extrusion deformation is much weaker, so the tendency of forming shrinkage defects is greater.
