Modeling and Eliminating Thermal Damage of Surface Integrity in Dry and Cryogenic Superfinish Hard Turning

9700095刘最近证明，在选定的条件下使用硬车削来超精加工表面是可行的。然而，就像磨削一样，如果加工条件产生太多热传导到已加工表面，作为精加工过程的硬车削可能会对已加工表面的完整性造成热损害。该研究项目的目标是：(1)研究硬车削加工表面的完整性；(2)开发一个模型来估计热损伤层的起始和上界作为包括后刀面磨损在内的加工条件的函数；(3)研究各种创新的方法，以延长刀具使用时间的目的(由后刀面磨损引起的表面损伤)。本研究针对硬车削过程中的热损伤问题进行了研究，消除热烧伤是硬车削推广应用的主要障碍。它有望取代单独的磨削和基于磨料的超级抛光，作为一种加工硬化零件的工艺。

9700095 Liu It was recently shown feasible to use hard turning in selected conditions to superfinish surfaces. However, just like grinding, hard turning as a finish process may produce thermal damage to the integrity of a machined surface if the machining conditions create too much heat conducted into the machined surface. The objectives of this research project are: (1) to study the integrity of machined surface by hard turning; (2) to develop a model to estimate the onset and upper bound of the thermally damaged layer as a function of machining conditions including flank wear; and (3) to study various innovative methods of extending the limit imposed by surface damage (resulted by flank wear) for the purpose of longer tool utilization. This research addresses the problem of thermal damage in hard turning, with the potential practical result of removing thermal burn as a major obstacle toward widespread application of hard turning. It holds the promise of replacing separate grinding and abrasive-based superfinish as a process for finishing hardened workpieces.