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

最近的研究表明，在选定的条件下使用硬车削对表面进行超精加工是可行的。然而，就像磨削一样，硬车削作为一个加工过程，如果加工条件产生过多的热量传导到加工表面，可能会对加工表面的完整性产生热损伤。本课题的研究目标是：(1)研究硬车削加工表面的完整性；(2)建立一个模型来估计热损伤层的起点和上限作为加工条件的函数，包括侧面磨损；(3)研究各种创新方法，以延长刀具的使用寿命为目的，延长表面损伤（由侧面磨损引起）的极限。本研究解决了硬车削中的热损伤问题，并具有消除热烧伤作为硬车削广泛应用的主要障碍的潜在实际结果。它有望取代单独的磨削和基于磨料的超精加工，作为加工硬化工件的一种工艺。

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.