Research Initiation: Temperature Prediction in Ultra- Precision Machining

本课题主要研究超精密加工中的温度问题。将建立一个分析模型，该模型将由于弹性回复和可能的后刀面磨损而在刀具-工件界面产生摩擦热。剪切区、前刀面和后刀面的加热将是耦合的。将提供热量分配和由此产生的温度与工艺变量和刀具/工件材料组合的函数关系。将在超精密机床上进行切割试验，以提供模型输入数据和验证。由此产生的预测能力和对主导物理的洞察将显著增加对超精密加工中切屑形成机理、刀具性能和磨损以及由此导致的工件亚表面损伤和残余应力状态的了解。这将在超精密加工过程中提高已加工工件的精度和质量。

This project deals with the study of the temperatures in ultra-precision machining. An analytical model will be developed which generates the frictional heating at the tool-workpiece interface due to elastic recovery and possible flank wear. Heating at the shear zone, rake face and flank face will be coupled. Functional dependence of the partitioning of heat and the resulting temperatures on the process variables and tool/workpiece material combinations will be provided. Cutting tests will be performed on ultra-precision machine tools to provide model input data and verification. The resulting predictive capability and insight into the governing physics will significantly increase the understanding of the mechanics of chip formation in ultra precision machining, tool performance and wear, and the resulting workpiece subsurface damage and residual stress state. This will lead the way to improved accuracy and quality of the machined workpiece, in the ultra precision machining process.