圆弧形砂轮精密修整及其声发射在线监测技术

发布时间：2018-12-13 05:23

【摘要】：针对球面、非球面及自由曲面超精密磨削加工用圆弧形金刚石砂轮难以精密修整的问题,提出基于旋转绿碳化硅(GC)磨棒的端部在位精密修整方法及修整过程的声发射在线监测技术。基于圆弧形金刚石砂轮的结构特性,制订圆弧形金刚石砂轮的在位精密修整与修整过程的声发射在线监测技术方案。依据修整与在线监测方案,对D64圆弧形金刚石砂轮进行修整实验及其声发射信号采集,修整后跳动误差小于10μm,比修整前减小30μm左右,砂轮精度显著提高。利用声发射信号均方根值获取砂轮修整结束的特征预警阈值,实现了旋转GC磨棒端部在位精密修整过程的在线监测以及修整结束时间的准确判断,可以有效提高球面非球面磨削加工过程的效率。
[Abstract]:Aiming at the problem that the circular arc diamond grinding wheel used in the ultra-precision grinding of spherical surface, aspherical surface and free-form surface is difficult to be trimmed precisely, An in situ precision dressing method based on rotating green silicon carbide (GC) grinding rod and an on line acoustic emission monitoring technique for the dressing process are proposed. Based on the structural characteristics of circular arc diamond grinding wheel, an on-line acoustic emission monitoring scheme for on-site precision dressing and dressing process of circular arc diamond grinding wheel is developed. According to the scheme of dressing and on-line monitoring, the dressing experiment and acoustic emission signal acquisition of D64 circular arc diamond grinding wheel are carried out. The runout error after dressing is less than 10 渭 m, which is about 30 渭 m less than that before dressing, and the precision of grinding wheel is improved significantly. Based on the root-mean-square value of acoustic emission signal, the characteristic warning threshold of finishing of grinding wheel is obtained, and the on-line monitoring of precision dressing process at the end of rotating GC grinding rod and the accurate judgment of finishing time are realized. It can effectively improve the efficiency of the grinding process of spherical aspherical surface.
【作者单位】：湖南科技大学智能制造研究院;湖南科技大学难加工材料高效精密加工湖南省重点实验室;广西师范大学电子工程学院;湖南时变通讯科技有限公司;哈尔滨工业大学机电工程学院;
【基金】：国家自然科学基金资助项目(51705148) 湖南科技大学博士启动基金资助项目(E56118);湖南科技大学难加工材料高效精密加工湖南省重点实验室开放基金资助项目(E21755)
【分类号】：TG580.6

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