摘要
已加工零件的表面特征会严重影响到零件的后期使用性能,为了提高零件的加工质量和后期的使用性能,有必要对零件已加工表面材料的晶粒尺寸和硬度的变化进行研究。在零件的切削加工过程中,零件表面材料的晶粒尺寸会不断变化,因此已加工零件的表面材料的性质与原先毛胚材料的性质会发生较大的变化,当在对切削过程进行仿真时,相应的变化需要得到考虑。文章在对7075铝合金的切削仿真过程中考虑了其微结构的变化,通过子程序对微结构的变化特征进行了定义,对其微结构变化的动态过程进行了仿真。在切削参数变化时,通过Zener-Hollomon和Hall-Petch方程对晶粒尺寸和硬度进行相应的描述。通过对相应的晶粒尺寸和硬度的仿真结果和实验结果的对比,验证了该模型的有效性。
The properties of the machined surface will significantly affect the performance of the machined workpiece. In order to improve the properties and the use life of the machined workpiece, it is necessary to do the researches on the changes of the microstructures and hardness on the machined workpiece. The grain size in the surface material layer will be changing during the machining process, so the properties of the machined surface material will be different from the bulk material. , and the macrostructure change should be considered during the simulations of the machining process. This paper presents some work in the simulations of the process of machining 7075 aluminum alloy, during which the microstructure change was considered. Zener-Hollomon and Hall-Petch equations were used to describe the grain size and hardness during the cutting process. According to the comparison of the simulation results and experimental results, the simulation model was validated as reliable.
出处
《组合机床与自动化加工技术》
北大核心
2017年第11期107-111,共5页
Modular Machine Tool & Automatic Manufacturing Technique
基金
国家自然科学基金资助项目(51575470)
江苏省"六大人才高峰"高层次人才资助项目(JXQC-029)
江苏高校"青蓝工程"资助项目(苏教师﹝2016﹞15号)
徐州工程学院江苏省大型工程装备检测与控制重点建设实验室开放课题资助项目(JSKLEDC201407)
关键词
7075铝合金
微结构
有限元
硬度
本构模型
7075 alurninium alloy
microstructure
finite element
hardness
constitutive model
