Heat Transfer in Thermally Assisted Machining of Difficult-to-Machine Materials

[802047] incropera & Shin/Purdue university这项工作将从理论上和实验上研究与使用强局部热源来增强传统加工难加工材料（如陶瓷和高温合金）相关的传输现象。集成强激光源的热辅助加工（TAM）将应用于氧化锆和钛合金等材料。TAM过程的理论处理将用于确定在材料去除区域附近的热条件下相关输运现象的作用。模型将考虑工件表面的净辐射和对流传递、传导和辐射发射、工件内部的吸收和散射、刀具-切屑界面处的摩擦以及材料塑性变形去除所产生的能量。将进行辅助实验以验证模型并表征加工样品的表面和次表面条件。这项工作的总体目标是提高对TAM过程的基本物理机制的理解，并建立一系列合适的操作条件。

9802047Incropera & Shin/Purdue UniversityThis work will theoretically and experimentally study the transport phenomena related to the use of intense localized sources of heat to augment conventional machining of difficult-to-machine materials, such as ceramics and superalloys. Thermally assisted machining (TAM) integrating intense laser sources will be applied to materials such as zirconia and titanium alloys. Theoretical treatments of TAM processes will be used to determine the role of pertinent transport phenomena on thermal conditions in proximity to regions of material removal. Models will consider net radiation and convection transfer from the workpiece surface, conduction and radiation emission, absorption and scattering within the workpiece, friction at the tool-chip interface and energy generation due to material removal by plastic deformation. Supporting experiments will be performed to validate the models and to characterize the surface and sub-surface conditions of the machined specimen. The overall objectives of the work are to obtain an improved understanding of the underlying physical mechanisms for TAM processes and to establish a range of suitable operating conditions.