Main points of processing technology of electrochemical deburring equipment

Main points of processing technology of electrochemical deburring equipment

The power supply of electrochemical deburring equipment adopts thyristor rectifier power supply. There are many technological factors affecting the processing effect of pulse electrochemical deburring, such as reasonable design of tool cathode, parameter selection of pulse power supply, composition, concentration, pressure and flow rate of electrolyte, electrode gap, current density, processing time, flow field characteristics, etc.

Tool cathode

The tool cathode should be reasonably designed according to the specific burr situation, and the masking technology should be applied in the design to ensure the efficient removal of the burr while protecting the original accuracy and surface quality of other non-burr parts on the anode surface of the workpiece. In addition, the basic principles of pulsed electrochemical machining should also be met, even if the electrolyte washes the machining part quickly and evenly, to ensure that the flow field distribution is uniform and reasonable. Since the surface quality of the electrode directly affects the surface quality of the deburring part, the surface of the tool cathode is required to be flat and smooth.

Pulse power

Theoretical research and machining practice show that the use of pulse power instead of DC power for deburring can effectively improve machining accuracy and surface quality. In processing, a narrower pulse width and a higher pulse frequency are generally used for processing. Due to the gap effect and step change of the pulse current, the electrolyte in the machining gap oscillates and a pressure wave is generated. The stirring effect of the pressure wave can improve the flow conditions of the electrolyte in the machining gap, accelerate the renewal of the electrolyte in the gap, and eliminate the The non-uniformity of the electrolyte conductivity distribution in the machining gap, thereby improving the machining accuracy and improving the surface roughness. In addition, due to the periodic renewal of the electrolyte, the electrochemical products in the gap (metal removed by the anode, hydrogen evolved from the cathode and Joule heat generated, etc.) can be promptly and fully eliminated. Pulse power supply parameters should be reasonably selected according to processing conditions.

Electrolyte

The composition of the electrolyte is the main factor affecting the processing quality. The nonlinear electrolyte with neutral inorganic salt as the main component has the characteristics of wide application range, easy control, small stray corrosion, good surface quality, and no pollution to the environment. During processing, the specific composition of the electrolyte should be determined according to the size of the burr, and the flow direction, flow rate and pressure of the electrolyte should be reasonably designed to quickly flush the removed burr away from the processing gap to avoid short circuits.

Other process factors

Reasonable selection of the gap between the cathode and anode is conducive to improving the etching speed and machining accuracy, and improving the quality of the machined surface. The selection of current density and processing time is also very important. Too high current density will aggravate stray corrosion, while too low current density will reduce processing efficiency and prolong processing time, while too long processing time will aggravate grain boundary corrosion. On the premise of satisfying the burr removal efficiency, the processing time should mainly be determined according to the size of the processing fillet.