MAGNETIC-ASSISTANCE IN CYLINDER-SURFACES FINISH

摘要

A new finish mode uses a magnetic-assistance with high efficiency to assist discharging dregs out of the electrodes' gap during the electrochemical finishing on the cylinder-surfaces is investigated in the current study. The factors affecting the effects of the magnetic-assistance in electrochemical finishing are primarily discussed. The mainly experimental parameters are magnetic strength, distance between the two magnets, current density, on/off period of pulsed-current, and width of tool-electrode. Providing large magnetic field intensity or using a small distance between the two magnets produces a larger magnetic force and discharge ability, and a better finish. Small width of tool-electrode provides sufficient discharge space, which is advantageous for magnetic-assistance electrochemical finishing. A higher current density with magnetic-assistance reduces the finish time and avoids the difficulty of dreg discharge. Pulsed direct current can slightly promote the effect of electrochemical finishing, but the current density needs to be increased. The magnetic-assistance during the electrochemical finishing process makes a great contribution in a short time by making the surface of the workpiece smooth and bright.