Study On Servo Control Of Muliti-circuit EDM Using Electrostatic Induction Power Supply

With the development of manufacturing industry,many challenges are put forword to EDM which are created by new high-speed machining methods.The main problem that restricts the development of EDM is the low processing speed.EDM is discontinuous in the time and space,because only one discharge occurrs in every pulse cycle.The removal rate can be improved by shorting the discharge pulse interval,increasing the single discharge energy and cleaning the interelectrode environment.However,all of the methods are themselves limited.This dissertation which is based on electrostatic induction power supply,explores the the multi-electrodes EDM to solve the discontinuities in time and space of EDM.Through studying the principle of multi electrode EDM,the circuit model is designed and simulated in the environment of Multisim.The waveforms of the discharge between the electrodes are collected to verify the possibility of multi-point discharge.The mechanical structure and control system are completed.Control programs of different drive modes are debugged.The experimental equipment is builded when the debug of the software and hardware is finished.The experiments are designed to discover the differences about processing speed and relative electrode wear rate when the experimental equipment work in different drive modes.Drives modes consist of power supply modes,drive modes and processing polarities.The electrode displacement curves under different driving modes are plotted to contraet the performance of two drive modes in the machining process.According to the experimental results,a circuit structure optimization scheme for power supply mode is proposed,and its advantages in processing speed are verified by experiments.The single factor experiments are designed to discover the differences about processing speed and relative electrode wear rate when the experimental equipment work in different machining parameters.Machining parameters consist of capacitance,voltage,pulse frequency,etc.Response Surface Methodology(RSM)experiments are designed to confirm the changing regularities which is cased by the multi-factors interaction influe.The mathematical model is builded which considers voltage,capacitor and pulse frequency as experiment parameters,and considers the material removal rate as response values.And the optimal process parameters are determined to guide the actual machining process.With the optimal drives modes and process parameters,the sample is carried out to verify the practical value of this method.The Processing speed of Muliti-circuit EDM using electrostatic induction power supply is higher than the conventional EDM.