The power supply of electrochemical deburring equipment uses thyristor rectifier power supply. There are many technological factors that affect the effect of pulsed electrochemical burring machining, such as reasonable design of tool cathode, parameter selection of pulse power supply, electrolyte composition, concentration, pressure and flow rate, pole gap, current density, processing time and flow field characteristics.
Electrochemical deburring equipment processing technology is as follows:
Tool cathode
The tool cathode should be reasonably designed according to the specific burr situation. In the design, attention should be paid to the application of masking technology to ensure the original accuracy and surface quality of other non-burr parts of the anode surface of the workpiece, and quickly remove burrs.
In addition, the basic principles of pulsed electrochemical machining should also be met, even if the electrolyte quickly and evenly cleans the machining part to ensure that the flow field is evenly distributed and reasonable. Because the surface quality of the electrode directly affects the surface quality of the burr removal site, the cathode surface of the tool is smooth.
Pulse power supply
The theoretical research and machining practice show that using pulse power instead of DC power for deburring can effectively improve machining precision and surface quality. In the process of processing, the pulse width is narrow and the pulse frequency is high.
Due to the pulse current gap action and jump change, the electrolyte in the machining gap oscillates and produces pressure waves. The mixing effect of pressure wave can improve the flow condition of electrolyte in the machining gap, accelerate the electrolyte renewal in the machining gap, eliminate the uneven distribution of electrolyte conductivity in the machining gap, and improve the machining precision and surface roughness.
Deburring equipment
In addition, due to the regular renewal of the electrolyte, the electrochemical substances in the gap (metal removed by the anode, hydrogen precipitated by the cathode and Joule heat, etc.) can be eliminated in a timely and sufficient manner. Pulse power supply parameters should be reasonably selected according to processing conditions.
electrolyte
The electrolyte composition 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 environmental friendliness. During the processing process, 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 wash away the removed burr from the processing gap and avoid short circuit.
Other process factors.
Reasonable choice of anode and cathode gap is beneficial to improve the corrosion speed and machining precision, and improve the machining surface quality. The choice of current density and processing time is also very important. Excessive current density will aggravate stray corrosion. Too small current density will reduce the processing efficiency and prolong the processing time, and too long the processing time will aggravate the crystal boundary corrosion. Under the premise of satisfying the burr removal efficiency, the processing time is mainly determined according to the size of the machining fillet.
