铁型覆砂球墨铸铁曲轴铸造过程中，界面换热系数(HTC)是影响温度场演化和凝固行为的关键参数，但其受温度变化、界面气隙形成及接触状态演化等因素影响显著，难以通过传统方法准确获得。 本文在实际生产条件下于铸件内部和覆砂层内同步布置热电偶，获取充型-凝固全过程的温度曲线；在此基础上，利用 ProCAST 软件中的Optimization 优化模块，对铸件-覆砂层及覆砂层-铁型界面的 HTC 进行反算。 结果表明，铸件/覆砂层界面 HTC 随温度呈现明显的阶段性变化特征，其数值由约 315 W/(m2·K)随温度升高逐渐增加至约 712.5 W/(m2·K)，并在液-固相变区发生显著变化。 将反算得到的 HTC 作为边界条件输入模拟后，所得温度曲线与实测结果在 1 500 s 之后基本重合，整体误差控制在 5%以内，明显优于采用恒定 HTC 模型的模拟结果。 研究表明，考虑 HTC 的温度依赖特性可有效提升铁型覆砂工艺温度场模拟的可靠性。

During the casting of sand-coated iron mold ductile iron crankshafts, the interfacial heat transfer coefficient(HTC) is a key parameter governing the evolution of the temperature field and solidification behavior; however, it isstrongly affected by temperature variation, interfacial air-gap formation, and changes in contact conditions, making accuratedetermination by conventional methods difficult. In this study, thermocouples were synchronously embedded inside thecasting and within the sand coating under actual production conditions to record the temperature histories throughout theentire filling and solidification process. On this basis, the HTC at the casting-sand coating and sand coating-iron moldinterfaces was inversely determined using the Optimization module in ProCAST software. The results indicate that theinterfacial HTC of the cast/sand coating exhibits a pronounced stage-dependent variation with temperature, increasing fromapproximately 315 W/(m2·K) to approximately 712.5 W/(m2·K) as the temperature increases and significantly changes inthe liquid-solid phase transformation region. When the inversely determined HTC is applied as the boundary condition inthe simulation, the calculated temperature curves show good agreement with the experimental results after 1 500 s, with theoverall deviation controlled within 5% , which is markedly better than that obtained using a constant HTC model. Theresults demonstrate that considering the temperature dependence of the HTC can effectively improve the reliability of thetemperature field simulation for the sand-coated iron mold casting process.