液体磁性磨具小孔光整加工材料去除机理及实验

针对小孔内壁光整加工技术的难题,本文提出一种新型精密研磨孔光整加工技术,以磁致相变理论为指导,从微观角度阐述了液体磁性磨具研磨孔光整加工的材料去除机理.采用"双刃圆半径"模型进行单个磨料颗粒切削模型研究,得出小孔光整加工的材料去除率数学表达式.通过实验验证了磨料粒度、入口压力、电流强度等因素对材料去除率以及表面粗糙度的影响,实验结果表明:在合适的范围内,增大磨料颗粒直径、入口压力以及电流强度有利于提高材料的去除率和表面质量.而当磨粒直径、入口压力以及电流强度选取过大时,虽然能获得较高的材料去除率,但是最终获得的表面粗糙度值并不理想.该研究为通孔零件内壁表面精密光整加工提供了有益参考.

Mechanism and Experiment of Material Removal for Liquid-Magnetic Abrasive Tool Finishing Machining of Micro-Holes

In order to solve the problem of finishing machining of micro-holes, a new technology was presented in this paper. The mechanism of material removal for liquid-magnetic abrasive tool finishing machining of micro-hole was illustrated from microscopic angle, based on the theory of magnetic-induced phase transition. ＂Double circle radius＂ model was adopted as the single abrasive particle cutting model to obtain the mathematical expressions of material removal rate. Experiments verified that the factors of abrasive particle size, inlet pressure and impressed current intensity influenced the processing efficiency and final surface roughness of finishing machining of micro-holes. When abrasive particle size, inlet pres- sure and current intensity increase within certain degree, the material removal rate and surface roughness are improved accordingly. But when abrasive particle size, inlet pressure and current intensity are too large, final surface quality is reduced. The research findings provide reference for finishing parts with mi- cro-hole.