基于热力学的航空用高锁螺母高效加工刀具磨损机理与应用基础研究

High efficiency cutting A286 highly self-locking nut of tensile resistance type is a nonlinear dynamic stochastic process with high temperature, high pressure, high strain rate,and serious tool wear and poor machining quality have become the key problems of high efficient processing of A286 highly self-locking nut of tensile resistance type.After the establishment of the high efficient machining thermodynamic system of A286 highly self-locking nut of tensile resistance type, its external entropy flow and internal entropy production will be studied, and the entropy generation model will be built which will be used to reveal the influence of each sub process of tool wear;the dynamic entropy balance equation then will be built to obtain the calculation formula of cutting liquid specific heat capacity based on thermodynamics. Then the cutting process for the A286 highly self-locking nut of tensile resistance type will be optimized in order to be used to predict the best cutting parameters when high efficient machining. At last, the thermodynamic constitutive equations of tool material and A286 highly self-locking nut of tensile resistance type material will be built based on the minimum energy consumption principle which will be used to simulate the machining process. The tool failure mechanism will be revealed based on thermodynamics, at the same time the high efficient processing measures will be also proposed which will rich the theoretical system of high efficient machining in scientific theory, and will also provide valuable references for the development of new cutting tool material and new secondary cutting way so as to increase tool life.

高效切削A286抗拉型高锁螺母是一个局部产生"高温、高压、高应变和高应变率"的非线性动态随机过程，刀具磨损严重和加工质量差已经成为严重制约A286抗拉型高锁螺母高效加工的关键问题。本项目在建立A286抗拉型高锁螺母高效加工热力学体系的基础上，研究该体系的外部熵流和内部熵产生，建立体系中各个子过程的熵产生模型，揭示各个子过程对刀具磨损的影响；建立体系的动态熵平衡方程，推导基于热力学的切削液比热容计算公式，优化A286抗拉型高锁螺母切削加工工艺，预测效率最高时的最佳切削用量；从热力学的核心原理-最小能耗原理出发，推导基于热力学的切削刀具和螺母材料的本构方程，并应用到切削仿真中。基于热力学的理论揭示A286抗拉型高锁螺母高效加工时刀具的失效机理，提出A286抗拉型高锁螺母高效加工的措施，在科学理论上丰富高效切削理论体系，在工程应用上为新型刀具材料的开发以及新的辅助切削加工方式的研究奠定基础。

高效切削 A286 抗拉型高锁螺母是一个局部产生“高温、高压、高应变和高应变率”的非线性动态随机过程，刀具磨损严重和加工质量差已经成为严重制约 A286 抗拉型高锁螺母高效加工的关键问题。本项目在建立 A286 抗拉型高锁螺母高效加工热力学体系的基础上，研究该体系的外部熵流和内部熵产生，建立体系中各个子过程的熵产生模型，揭示各个子过程对刀具磨损的影响；建立体系的动态熵平衡方程，推导基于热力学的切削液比热容计算公式，优化 A286 抗拉型高锁螺母切削加工工艺，预测效率最高时的最佳切削用量；从热力学的核心原理—最小能耗原理出发，推导基于热力学的切削刀具和螺母材料的本构方程，并应用到切削仿真中。基于热力学的理论揭示 A286 抗拉型高锁螺母高效加工时刀具的失效机理，提出 A286 抗拉型高锁螺母高效加工的措施，在科学理论上丰富高效切削理论体系，在工程应用上为新型刀具材料的开发以及新的辅助切削加工方式的研究奠定基础。.主要研究进展、重要结果如下：①本项目构建了A286 抗拉型高锁螺母高效加工热力学体系，研究了体系的外部熵流和内部熵产生，②建立了体系的动态熵平衡方程，基于该动态熵平衡方程，优化A286 抗拉型高锁螺母切削加工工艺，预测了效率最高时的最佳切削用量，③推导了基于热力学的切削刀具和螺母材料的本构方程，并应用到切削仿真中，揭示了A286 抗拉型高锁螺母高效加工时刀具的失效机理，提出了 A286 抗拉型高锁螺母高效加工的措施，丰富了高效切削理论体系，在工程应用上为新型刀具材料的开发以及新的辅助切削加工方式的研究奠定了基础。