Impact of the pressure between the casting and water-cooled mode on the interfacial heat transfer coefficient under LPDC

Abstract

Abstract Low pressure die casting (LDPC) is the main method for aluminum alloy castings. In order to obtain no porous castings, a top-down progressive solidification is required. Owing to the complicated casting shape and the uneven wall thickness, it is difficult to achieve the above requirement, which limits the application of the method. The water-cooled mode, with controllable cooling capacity, can solve this problem, and great importance has been attached to the heat exchange between water-cooled mode and castings. In the present paper, the inverse solution method is adopted to study the influence of the casting mold/casting interface pressure and circulating water flow rate on the interface heat transfer coefficient (IHTC). The results show that the increasing interface pressure and the circulating water flow rate can lead to the highest IHTC of 781.6∼1002.4 W/(m2 ·K) and 1002.4∼1657.6 W/(m2 ·K) respectively. The calculation result of IHTC provides a basis for the design of low pressure casting with water-cooled mode.