Design And Experimental Study Of Adaptive Pulse Power Supply For Rotating Ultrasonic Vibration Assisted EDM

With the continuous progress of social development,the research direction of my country's manufacturing development has gradually changed from the basic traditional processing methods to the pursuit of high-precision manufacturing and processing research,thereby achieving the goal of manufacturing in China 2025.Due to the unique advantages of EDM in precision machining,it has been widely used in aerospace industry,automobile manufacturing,medical equipment and other fields.By analyzing the research status at home and abroad,it is difficult to control the machining state due to the combined action of multiple fields in the gap of rotary ultrasonic assisted EDM machining,which puts forward new requirements for the pulse power supply.Therefore,this paper conducts in-depth research on the monitoring of the gap state of EDM,proposes the adaptive mechanism of the pulse power supply to the rough machining and finishing conditions of EDM under different working conditions,and proposes the overall design scheme and prototype of the adaptive pulse power supply The main content of the experiment is as follows:Design a hardware circuit with an FPGA chip as the main control unit,combine with peripheral hardware circuits to build an adaptive pulse power supply experimental prototype,realize the pulse generation through the IP core pulse generator in the FPGA,and realize the pulse signal through the power and drive amplifier circuit The processing and driving control are loaded on both ends of the electrode wire and the workpiece to complete the output of pulse energy.Design data acquisition hardware circuit and analog-to-digital conversion hardware circuit to achieve accurate collection of gap data.The software part is programmed to send the collected inter-polar data to the FPGA through the SPI communication interface.The threshold detection method and the peak voltage monitoring method of the machining gap detection are combined to perform basic discrimination,which can efficiently and accurately determine the processing status and adjust in real time.The duty cycle of the pulse generator output.The collected inter-polar data is sent to the host computer through the RS-232 communication protocol for real-time communication.The BP neural network trained by the BP-PID adaptive controller optimizes the parameter of the Z-axis servo motor feed and is moved by the IMAC.The control card controls the Z-axis servo motor to maintain a stable processing gap and improve processing efficiency.Through prototype test,the experimental results show that the practicality of the adaptive pulse power supply scheme of EDM and the feasibility of the output waveform to meet the design requirements can meet the actual processing requirements.