An efficient closed-form method for determining interfacial heat transfer coefficient in metal forming
An efficient closed-form method for determining interfacial heat transfer coefficient in metal forming
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DOI：
10.1016/j.ijmachtools.2011.12.005
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发表时间：
2012-05
影响因子：
14
通讯作者：
Q. Bai;Jianguo Lin;L. Zhan;T. Dean;D. Balint;Z. Zhang
中科院分区：
文献类型：
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作者：
Q. Bai;Jianguo Lin;L. Zhan;T. Dean;D. Balint;Z. Zhang
在金属热/温成形过程中，工件与模具之间的界面传热对成形件的温度分布、组织演变和力学性能有重要影响。建立了一个有效的数值模型，用于确定不同成形和接触条件下的界面传热系数。在对典型试验机进行有限元传热分析的基础上，建立了一维传热模型。一个数值程序已经开发和实施，用于确定工件和模具的表面温度，接触热流，和IHTC。通过实验、数值计算和有限元计算结果的比较，验证了数值模型的正确性。针对燃气轮机涡轮机叶片热锻工艺，研究了压力、釉层厚度和表面粗糙度对Ti-6Al-4V工件和H13钢模具IHTC的影响。应用结果表明，该数值方法可为预测热成形条件下的IHTC提供可靠的手段。
During hot/warm metal forming processes, interfacial heat transfer between work-piece and dies has an important effect on the temperature distribution, microstructure evolution and mechanical properties of formed parts. An efficient numerical model has been developed for the determination of interfacial heat transfer coefficient (IHTC) at different forming and contact conditions. Based on FE heat transfer analysis for a typical tester, a 1D heat transfer model is proposed. A numerical procedure has been developed and implemented for determining the surface temperatures of work-piece and die, the contact heat flux, and the IHTC. The numerical model has been validated by the comparison of experimental, numerical and finite element results. For gas turbine blade hot forging process, the effects of pressure, glaze thickness and surface roughness on the IHTC of Ti-6Al-4V work-piece and H13 steel die were investigated. The application results indicated that this numerical method can provide a reliable means of predicting the IHTC in hot metal forming conditions.