| Electrochemical machining is the process to eliminate materials by electrochemical dissolution at metal anodes. Machining precision is the key to electrochemical machining. As proved by current experiments, after certain way of magnetic field is added to electrochemical machining, processing precision will have some changes, but the functioning mechanism is still unclear.To reveal the mechanism of magnetic field to affect electrochemical machining, find out the rule of action, and establish the foundation to improve machining precision by actively controlling magnetic field,3 adding ways of magnetic field were designed in this paper, a mathematical model and finite element model for the analysis of magnetic field, electric field and flow field in the gaps of magnetic field combined electrochemical machining were established. COMSOL Multiphysics, the finite element software, was introduced to analyze the influence of magnetic fields of different ways and magnetization intensities on the distribution of flow field in machining gap and the removal of anode materials. At last, force analysis was made on charged ion under the action of vertical magnetic field from microscopic view. Movement locus of single charged ion under the action of vertical magnet field was calculated and deduced.The simulation results show that at the point where electromagnetic force is comparatively stronger, electromagnetic force acts as the drive to fluid; at the point where electromagnetic force is comparatively weaker, electromagnetic force acts as the obstruction for fluid. With given parameters, when magnetic line of force is orthogonal to electric field line and flow line, direction of electromagnetic force is in parallel with flow rate, and the flow rate of electrolyte functioned by electromagnetic force varies 0～11.6m/s, and within 0～0.2ms, the fluid is given a bi-directional stirring function up and down; when magnetic line of force is in parallel with electric field line and vertical to flow line, the electromagnetic force generated is comparatively weaker and has smaller effect on fluid, and the flow rate of electrolyte varies 0-2.4m/s; when magnetic line of force is vertical to electric field line and in parallel with flow line, the electromagnetic force generated is orthogonal to flow line and electric field line, and the actfon effect of electromagnetic force on fluid is comparatively stronger, and the flow rate of electrolyte varies 0-15.5m/s, and within 0-0.6m/s, electrolyte is given a bi-directional stirring function right and left by electromagnetic force. Meanwhile, it reaches to the conclusion that under the action of vertical magnetic field, removal rate of anode material increases and keeps increasing with increasing magnetic field intensity; the magnetic field, whose magnetic line of force is parallel to electric field line, has little influence on processing result. From microcosmic view, author deduced the movement locus equation of single charged ion with and without the action of vertical magnetic field. The result indicates that the movement locus becomes longer under action of vertical magnetic field than being without. |
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