SiCp/Al复合材料超精密切削加工表面/亚表面损伤形成机理与抑制方法研究

With the extreme requirement for the SiCp/Al composites machined surface integrity in the high-technology field, machined surface/sub-surface damage become the bottleneck to restrict the application of SiCp/Al composites. For achieving the high-precision low-damage machined surface, the cutting simulation model based on both the Macro Equivalent Homogenous Material model and Micro Three-phase Material model is established to reveal the forming mechanism of machined surface/sub-surface damage in ultra-precision machining of SiCp/Al composites. Then the characterizaiton method of machined surface/sub-surface damage is established, the influence law of cutting parameters and tool geometry for machined surface/sub-surface damage through the established cutting simulation model is analyzed. Based on the established Macro-Micro coupling simulation model , the controlling method of machined surface/sub-surface damage is proposed to achieve the low-damage ultra-precision machining technology of SiCp/Al composites. The results of this project have not only important practical meaning to enhance the performance of key component in aviation, aerospace and weapon field but also important theoretic value for perfecting the ultra-precision machining technology of SiCp/Al composites.

随着尖端科技领域对SiCp/Al复合材料加工表面完整性的要求日趋苛刻，加工表面/亚表面损伤成为了制约该材料应用的瓶颈。本课题针对高效获取SiCp/Al复合材料高精度低损伤加工表面的问题，建立了该材料宏观等效均质材料切削仿真模型及微观三相材料切削仿真模型，通过模型仿真揭示SiCp/Al复合材料超精密切削加工表面/亚表面损伤的形成机理，建立主要加工表面/亚表面损伤形态的量化表征方法，研究不同切削参数与刀具几何参数对加工表面/亚表面损伤的影响规律，提出基于宏观-微观耦合仿真模型的加工表面/亚表面损伤的抑制方法，获得实现SiCp/Al复合材料超精密低损伤加工的技术措施。本课题的成果对提升航空、航天和武器装备等领域核心零部件的性能具有重大的实际意义，对完善碳化硅颗粒增强铝基复合材料的超精密切削加工工艺具有重要的理论价值。

随着尖端科技领域对SiCp/Al复合材料加工表面完整性的要求日趋苛刻，加工表面/亚表面损伤成为了制约该材料应用的瓶颈。本课题针对高效获取SiCp/Al复合材料高精度低损伤加工表面的问题，基于多尺度分析的思想，借助分子动力学与有限元相结合的方法，通过宏观模型与微观模型仿真结合研究SiCp/Al复合材料超精密切削加工表面/亚表面损伤的形成机理，在此基础上建立三维粗糙度、缺陷几何参数与分形维数结合的SiCp/Al复合材料超精密切削加工表面质量的综合表征参数体系，获得了切削参数对加工表面损伤的影响规律,本课题研究对进一步提高SiCp/Al复合材料在尖端武器装备上应用具有重要意义。