Li Jing, Chen Wanwan, Zhu Yongwei
School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China.
JITRI Institute of Precision Manufacturing, Nanjing 211800, China.
Materials (Basel). 2023 Mar 28;16(7):2703. doi: 10.3390/ma16072703.
This study proposes the mechanism of two-dimensional ultrasonic assisted grinding- electrolysis-discharge generating machining (2UG-E-DM). It analyzed the influence of vibration directions on grinding characteristics and surface morphology through the motion simulation of an abrasive. Comparative experiments with different vibration directions verified the effect of ultrasonic assistance on the weakening of the grinding force, the widening of the surface pits, and the leveling of the surface morphology of SiC/Al composites. Simulation analysis of a single abrasive particle verified the test results. The results of machining tests at different amplitudes showed that as the workpiece and tool amplitude increased, the grinding force of the normal force decreased faster than that of the tangential force. The effect of surface electrolysis discharge machining was significant, and the number of exposed particles increased, but the residual height of the surface and the surface roughness were reduced by vibration grinding. When the two-dimensional amplitude was increased to 5 μm, the axial and tangential vibrations increased the grinding domain, and the dragging and rolling of the reinforced particles significantly reduced the surface roughness, which obtained good surface quality.
本研究提出了二维超声辅助磨削-电解-放电复合加工（2UG-E-DM）的机理。通过磨粒的运动仿真分析了振动方向对磨削特性和表面形貌的影响。不同振动方向的对比实验验证了超声辅助对削弱磨削力、扩大表面凹坑以及平整SiC/Al复合材料表面形貌的作用。单个磨粒的仿真分析验证了试验结果。不同振幅下的加工试验结果表明，随着工件和工具振幅的增加，法向力的磨削力比切向力下降得更快。表面电解放电加工的效果显著，暴露颗粒数量增加，但振动磨削降低了表面残余高度和表面粗糙度。当二维振幅增加到5μm时，轴向和切向振动扩大了磨削区域，增强颗粒的拖动和滚动显著降低了表面粗糙度，从而获得了良好的表面质量。
