Anticipating the processes and parameters involved for accomplishing a sound metal casting requires an in-depth understanding of the underlying behaviors characterizing a liquid melt solidifying inside its mold. Heat balance represents a major factor in describing the thermal conditions in a casting process and one of its main influences is the heat transfer between the casting and its surroundings. Local heat transfer coefficients describe how well heat can be transferred from one body or material to another. This paper will discuss the estimation of these coefficients in a gravity die casting process with local air gap formation and heat shrinkage induced contact pressure. Both an experimental evaluation and a numerical modeling for a solidification simulation will be performed as two means of investigating the local heat transfer coefficients and their local differences for regions with air gap formation or contact pressure when casting A356 (AlSi7Mg0.3).

预测完成良好金属铸造所涉及的过程和参数需要深入了解表征液态熔体在其模具内凝固的基本行为。热平衡是描述铸造过程中热条件的主要因素，其主要影响之一是铸件与其周围环境之间的热传递。局部传热系数描述了热量从一个物体或材料传递到另一个物体或材料的程度。本文将讨论在具有局部气隙形成和热收缩引起的接触压力的重力压铸工艺中对这些系数的估计。