球形磁极在小直径钛合金管内表面抛光中的应用

Application of Spherical Magnetic Pole in Polishing of Inner Surface of Small Diameter TC4 Tubes

针对传统磁力研磨对小直径钛合金管内表面进行精密抛光时,研磨效率低、加工后表面质量不理想的问题,提出将多个球形磁极作为辅助抛光工具放置在管件内部,配合多种运动,完成对小直径钛合金管内表面的高效精密抛光。对比了添加不同辅助抛光工具后工件的表面粗糙度值和材料去除量的变化,分析了工件转速对研磨效果的影响。对4×150mm的TC4钛合金管进行精密抛光实验,实验结果表明:工件转速为20000r/min时的研磨效果最好,使用球形磁极研磨40min后,工件表面粗糙度值稳定至Ra0.2μm,材料去除量可达55mg,原始缺陷被去除;使用球形磁极作为辅助抛光工具时,研磨效率显著提升,且能够获得理想的表面质量;当工件转速不超过临界值时,工件的转速越高,研磨效果越好。

When the inner surface of the small diameter titanium alloy tube is polished by magnetic abrasive finishing,the efficiency is low and the surface quality is not ideal.In this paper,multiple spherical magnetic poles are used as an auxiliary polishing tool to be placed inside the workpiece,and a plurality of motions are applied to finish the polishing.The surface roughness and material removal of the workpiece under two kinds of auxiliary polishing tools are compared.The effect of the speed on efficiency is analyzed.The precision polishing experiment ofΦ4×150mm TC4 titanium alloy tube is carried out.The results show that when the workpiece speed is 20000r/min,the processing effect is the best.After 40min processing with spherical magnetic pole,the surface roughness value of the workpiece is stabilized to R a0.2μm,the material removal amount can reach 55mg,and the original defect is removed;When the auxiliary polishing tool is the spherical magnetic pole,the efficiency is improved remarkably,and the ideal surface quality can be obtained;when the workpiece speed does not exceed the critical value,the higher the speed is,the higher the efficiency is.