METHOD AND SYSTEM FOR INCREASING THE EFFICIENCY OF MACHINED SURFACE FINISHING PROCESS USING THE ERROSIVE EFFECT OF ELECTRIC DISCHARGE

摘要

The invention relates to a method for increasing the efficiency of the machined surface finishing process under the errosive effect of electric discharge and to an equipment for carrying out the said method. According to the invention, the method consists in that, among the processing pulses the energy whereof corresponds to a preset finishing degree, a polluting pulse of much higher energy than the processing pulses is introduced with a view to achieving excess local pollution favouring the subsequent discharges. The equipment comprises two electrodes, a tool-electrode () and an electrode () consisting of a piece to be processed, submerged into a liquid dielectric medium, where the processing energy is provided by the discharge of a first capacitor charged from a first voltage source, by means of a first resistor, serially connected with a first diode and a first commutation element, controlled into the conduction state during the charging of the capacitor, the state of the interstice being permanently controlled by means of a current injected into the space between the electrodes () from a second voltage source, by means of a second resistor serially connected with a second diode, where, for carrying out the claimed method, the said equipment is provided with a second commutation element () between the first above-mentioned capacitor and the tool-electrode, while, from a third source () having an idle value higher than the first source, a second capacitor () having a higher capacity than the first capacitor is charged, by means of a third resistor () serially connected with a third commutation element () controlled into the conduction state during the charging of the second capacitor which is, in its turn, separated from the tool-electrode () by a fourth commutation element () controlled into the conduction state in opposite phase with the second commutation element ().