为了解决双盘直槽研磨方法实施过程中的关键技术问题,针对圆柱滚子在研磨状态下的自转运动展开相关研究。首先,对圆柱滚子在研磨状态下的自转运动进行理论分析,得到了其稳定自转的条件。然后,基于ADAMS(automatic dynamic analysis of m...为了解决双盘直槽研磨方法实施过程中的关键技术问题,针对圆柱滚子在研磨状态下的自转运动展开相关研究。首先,对圆柱滚子在研磨状态下的自转运动进行理论分析,得到了其稳定自转的条件。然后,基于ADAMS(automatic dynamic analysis of mechanical systems,机械系统动力学自动分析)软件建立了圆柱滚子自转运动的动力学仿真模型,并以圆柱滚子与上、下研磨盘间的摩擦系数,下研磨盘V形槽半角,单个圆柱滚子所受研磨载荷及上、下研磨盘相对运动线速度为主要影响因素,以圆柱滚子的相对滑动率为评价指标,进行了计及因素间交互作用的正交试验。通过响应均值分析与方差分析,得到了可实现圆柱滚子稳定且连续自转的最优参数组合。最后,在自主设计的圆柱滚子自转运动试验平台上对最优参数组合的正确性进行了验证试验。试验结果表明,最优参数组合下圆柱滚子自转时的平均相对滑动率仅为0.30%,能够实现稳定且连续的自转,这充分证明了通过理论分析与正交试验得到的最优参数组合的正确性。研究结果证实了基于双盘直槽研磨的圆柱滚子自转运动的合理可行域,其对双盘直槽研磨方法的工程实践具有指导意义,为提高圆柱滚子批直径尺寸一致性奠定了基础。展开更多
This paper studies the micro-cutting characteristics of aluminum alloy (2A12) based on a series of orthogonal experiments and finite element method (FEM) simulations. An energy-based ductile failure law was proposed i...This paper studies the micro-cutting characteristics of aluminum alloy (2A12) based on a series of orthogonal experiments and finite element method (FEM) simulations. An energy-based ductile failure law was proposed in the FEM simulation. The simulated cutting forces and chip morphology were compared with experimental results. The simulation result indicates that there is a close relationship between the cutting force and cutting heat. The micro-cutting force decreases as the heat flux vector increases. Both the cutting heat and the micro-cutting force need a finite time to achieve a steady state. It is observed that with the cutting speed of 169.95 m/min and uncut chip thickness of 6 μm, the heat flux vector in the workpiece increases to a stable value after 0.06 ms; meanwhile, the principal cutting force decreases to a steady state correspondingly, i.e., the micro-cutting process achieves the steady state. It is concluded that the steady state micro-cutting simulation can reflect the cutting process accurately.展开更多
基金Supported by the National High Technology Research and Development Program of China ("863" Program, No.2008AA042509)
文摘This paper studies the micro-cutting characteristics of aluminum alloy (2A12) based on a series of orthogonal experiments and finite element method (FEM) simulations. An energy-based ductile failure law was proposed in the FEM simulation. The simulated cutting forces and chip morphology were compared with experimental results. The simulation result indicates that there is a close relationship between the cutting force and cutting heat. The micro-cutting force decreases as the heat flux vector increases. Both the cutting heat and the micro-cutting force need a finite time to achieve a steady state. It is observed that with the cutting speed of 169.95 m/min and uncut chip thickness of 6 μm, the heat flux vector in the workpiece increases to a stable value after 0.06 ms; meanwhile, the principal cutting force decreases to a steady state correspondingly, i.e., the micro-cutting process achieves the steady state. It is concluded that the steady state micro-cutting simulation can reflect the cutting process accurately.
