玻璃陶瓷内孔旋转超声磨削出口崩边面积研究

Study on Edge Collapse Area of Glass Ceramic Inner Hole in Rotary Ultrasonic Grinding

针对工程陶瓷等脆性材料在制孔中出口质量较差的问题,采用旋转超声磨削的孔加工工艺。基于Abaqus软件建立旋转超声磨削仿真模型,根据其应力情况对孔出口崩边的形成机理进行仿真分析,并设计玻璃陶瓷旋内孔转超声磨削加工试验,研究不同工艺参数对其崩边面积的影响。结果表明,内孔深度增加,玻璃陶瓷由初始阶段的压应力逐渐变成拉应力,并在拉应力作用下产生裂纹并形成出口崩边;主轴转速和超声功率增加,其崩边面积呈逐渐减小的趋势;进给速度增加,其崩边面积呈逐渐增加的趋势。与普通磨削加工方式相比,旋转超声磨削可有效减少出口崩边面积,当超声功率为100W时,出口崩边面积减小了57.8%,大大提高了内孔磨削加工质量。

In order to solve the problem of poor export quality of brittle materials such as engineering ceramics,rotary ultrasonic grinding technology is adopted.Based on Abaqus software,the simulation model of rotary ultrasonic grinding is established.According to the stress condition,the forming mechanism of edge collapse at the hole exit is simulated and analyzed.The experiment of rotary ultrasonic grinding of glass ceramic inner hole is designed to study the influence of different process parameters on the edge collapse area.The results show that with the increase of the depth of the inner hole,the compressive stress in the initial stage of the glass ceramics gradually changes into the tensile stress,and under the action of the tensile stress,cracks are formed and the edge collapse occurs at the exit.The edge collapse area decreases gradually with the increase of the spindle speed and the ultrasonic power.The edge collapse area increases gradually with the increase of the feed speed.Compared with the conventional grinding method,rotary ultrasonic machining can effectively reduce the area of edge collapse at the outlet.When the ultrasonic power is 100W,the area of edge collapse at the outlet is reduced by 57.8%,which greatly improves the quality of inner hole grinding.