磁流变即效微细砂轮精细加工研究

Research on a new superfine machining method based on the magnetorheological fluids

在对磁流变液特性分析的基础上,提出了基于磁流变效应即效微细砂轮研抛的新工艺方法。磁流变液与金刚石微粉磨料均匀混合形成的抛光液,在外加磁场作用下形成粘弹性的准固体磨粒球团构成的微细砂轮,以普通玻璃为工件材料,基础试验证明本加工方法在加工玻璃材料时可行和有效。试验结果表明,磁流变即效微细砂轮在加工玻璃过程中加工表面呈现塑性去除特征,加工工具无进给时加工痕迹表面有中间突边缘圆环凹陷的形状,工具尖端与加工表面越接近其材料去除率越高。

This paper introduced the principle and characteristics of Magnetorheological Fluid （ MR Fluid）, and presented a new superfine machining method based on MR effect of abrasive slurry. In this technique, the MR fluid, which is a suspension of magnetizable particles, non - magnetic abrasives and carrier medium, is dynamical abruptly transformed into a plastic like solid under an applied external magnetic field and forms a dynamical tiny - grinding wheel. The normal glass was polished by applying the MR effect - based instantaneous tiny - grinding wheel. The machined surface with convex center and concave fringe confirms the effectiveness and feasibility of the tiny - grinding finishing method. Experimental results indicated that the material removal mode of finishing glass is the ductile - removal mode. With the reducing of the machining distance between the needle - like tool and the workpiece, the efficiency of material removal is gradually increased.