超粗糙氧化锆复合陶瓷磁性剪切增稠光整加工特性

Magnetic Shear Thickening Finishing Characteristics of Ultra⁃rough ZrO_(2) Composite Ceramics

针对超粗糙表面氧化锆陶瓷材料的光整问题,配置磁性剪切增稠光整加工介质,利用设计的磁场发生装置,在主轴转速900 r/min、X轴进给速度10000 mm/min和加工间隙0.7 mm的实验参数下,探究不同磨粒和磨粒粒径对氧化锆陶瓷件加工的影响规律。对250μm绿碳化硅的磁性剪切增稠光整介质进行加工时,工件表面粗糙度值能在180 min内降低38%。10μm立方氮化硼配置的磁性剪切增稠光整介质,能使工件表面粗糙度值在210 min内降低41%。在磨粒粒径相同的条件下,随着磨粒硬度的提高,加工效率增大。在磨粒质量分数相同的条件下,磨粒粒径越小,获取的最终表面粗糙度值越小。观测结果表明,对比未加工表面,加工后的表面变得光滑,材料去除肉眼可见,验证了所提出方法的有效性。

In order to solve the problem of finishing ultra⁃rough ZrO_(2) ceramics,the magnetic shear thickening and finishing medium was prepared.The influence of processing with different abrasive types and particle sizes was investigated using the designed magnetic field generator under the experimental parameters of spindle speed of 900 r/min,X axis feed speed of 10000 mm/min and processing clearance of 0.7 mm.The surface roughness of the workpiece was increased by 38%within 180 min with 250μm green silicon carbide magnetic shear thickening finishing medium.The roughness of the workpiece surface was increased by 41%in 210 min with 10μm cubic boron nitride as magnetic shear thickening finishing medium.The processing efficiency increased with the increase of abrasive hardness under the condition of same abrasive particle size.Moreover,under the condition of the same abrasive mass fraction,the smaller abrasive particle size was,the smaller surface roughness value was obtained.The results showed that the processed surface became smooth and the material was removed,which verified the effectiveness of the proposed method compared with the orignal surface.