砂轮约束磨粒喷射精密光整加工表面互相关性分析

Cross correlation analysis on surface profile machined with abrasive jet precision finishing with grinding wheel as restraint

磨粒喷射精密光整加工是重要零件在磨削后进行去除表面缺陷层、降低粗糙度和波纹度为目的光整加工新工艺。试验在M7120磨床上完成，加工试样为Ra0．4～0．6μm的45。钢。加工表面形貌和微观几何参数用SEM和TR200表面轮廓仪测量。本文应用随机过程的互相关性对磨削加工表面和光整加工表面进行了研究。试验结果表明，试样表面从连续的方向一致的沟槽被随机不连续的微坑所代替，表面粗糙度明显得到改善。随着加工循环的增加，Ra值由0．4～0．6μm下降到0．2μm左右。此外，光整加工可以获得各向同性网纹交错的表面，表面轮廓的支撑长度率提高，对工件的耐磨性有利。

Abrasive jet finishing process is a novel process whose objective is to remove surface defect layer and to diminish roughness and ripple after grinding. Experiments were performed with plane grinder M7120 and the workpiece material 45# steel which was ground with the surface roughness values of Ra = 0.4 - 0.6 μm. The machined surface morphology was studied using SEM and the microcosmic geometry parameters were measured with TR200 profilometer. In this paper with cross correlation of random process ,the surface of grinding machining and abrasive jet finishing machining are researched. The result indicated that the machined surface changed from continuous parallel micro-groove and plough to randomly distributed discontinuous micro-pit and the surface roughness was obviously decreased. Ra decreased from an initial value of about 0.4 - 0.6 μm down to about 0.2 μm with machining circles increasing. Furthermore, the isotropy cross structured surface in both parallel and perpendicular machining direction were attained by abrasive jet precision finishing with grinding wheel as restraint. This was favorable for the wearable capability of the workpiece.