Factors that affect the effect of pulsed electrochemical deburring processing There are many process factors that affect the effect of pulsed electrochemical deburring processing, such as the rational design of the tool cathode, the selection of the parameters of the pulse power supply, the composition of the electrolyte, the concentration, the pressure and the flow rate, the interpolar Gap, current density, processing time, flow field characteristics, etc.
1) Tool cathode The tool cathode should be reasonably designed according to the specific burr situation, and the design should pay attention to the application of shielding technology to ensure the effective removal of burrs while protecting the original accuracy and surface quality of other non-burr parts on the anode surface of the workpiece. In addition, the basic principle of pulse electrochemical machining should also be met, even if the electrolyte scours the machined parts quickly and evenly to ensure a uniform and reasonable flow field distribution. Because the surface quality of the electrode directly affects the surface quality of the burr removal site, the tool cathode surface is required to be flat and smooth.
2) The theoretical research and processing practice of pulse power supply show that using pulse power supply instead of DC power supply for deburring processing can effectively improve processing accuracy and surface quality. In processing, generally narrower pulse width and higher pulse frequency are used for processing. Due to the gap effect and step change of the pulse current, the electrolyte in the machining gap oscillates, generating pressure waves. The stirring effect of the pressure wave can improve the flow conditions of the electrolyte in the machining gap, accelerate the update of the electrolyte in the gap, and eliminate 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 from the anode, hydrogen evolved from the cathode, and Joule heat generated, etc.) can be promptly and fully eliminated. The pulse power parameters should be reasonably selected according to the processing conditions.
3) Electrolyte
The electrolyte composition is the main factor affecting the processing quality. The non-linear 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. When 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 rationally designed to quickly remove the removed burr from the processing gap to avoid short circuit.
4) Other process factors
Reasonable selection of the gap between the cathode and anode is conducive to improving the etching speed and processing accuracy, and improving the quality of the processed surface. The selection 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, while too long the processing time will aggravate the 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.
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