DESIGN SYSTEM OF MAGNETIC ASSISTANCE IN SURFACE FINISHING

摘要

This study provides a new design system using a magnetic force with high efficiency to assistrndischarging dregs out of the electrode gap during electrochemical finishing on the surfacernfinishing process. In the current experiment, author takes a mate-shape electrode for instancernsupplied with continuous and pulsed direct current in the electrochemical finishing. Therndesign features of the performance assessment of discharging dregs of the magnetic force arernof major interest for the finishing process. The controlled factors include workpiece material,rnand chemical composition and concentration of the electrolyte. The experimental parametersrnare initial gap width, flow rate of electrolyte, current rating, feed rate of workpiece, rotationalrnspeed of electrode, on/off period of pulsed current, magnetic strength, and distance betweenrnthe two magnets. For the design system, an adequate rotational speed of the electrodernproduces better finishing. The higher current rating with magnetic assistance can avoid therndifficulty of dreg discharge, thus reducing the finishing time. Small distance between the twornmagnets or large magnetic field intensity provides larger magnetic force and discharge abilityrnand better finishing. Pulsed direct current can slightly promote the effect of electrochemicalrnfinishing, but the machining time is longer and the cost is raised. The magnetic-assistancernelectrochemical finishing without pulsed current is recommended for the finishing process. Itrnis a great contribution that the magnetic-assistance electrochemical finishing just needs quiternshort to make the surface of workpiece smooth and bright.