超声复合电解加工在线参数检测、控制与试验研究

Online Parameter Detection Control and Experimental Research of Ultrasonic Combined Electrochemical Machining

超声复合电解加工的参数条件变化较大时,其系统共振条件难以维持,影响加工效率与精度。设计、构建在线参数检测与实时控制系统,选用激光、电流等高速高精传感器,进行超声频率及位移、超声发生器与脉冲电源的输出电压、电极间电参数进行在线检测,利用PCI-1706U数据采集卡、控制计算机等构建参数实时采集、控制系统,由单片机STM32控制数字电位器,实现超声参数在线检测、实时调节;电极间电压可由系统实时优化调节。采用Visual C++6.0,通过多串口类进行系统软件设计,对各信号数据进行采集、处理、显示等。进行系统自动调节与手动调节对比试验,采用参数实时控制系统进行超声复合电解加工,在保持精度条件下,能有效提高加工过程稳定性和加工效率。

The system resonance is difficult to maintain in the machining process of ultrasonic combined electrochemical machining,because a manual adjustment of ultrasonic frequency generates test error.This problem can be solved by constructing and perfecting the online parameter detection and control system of ultrasonic combined electrochemical machining.This study build the data acquisition system of the signal parameters by selecting a variety of high speed and high precision sensor,vibration displacement of tool electrode in the process of ultrasonic power and pulse power output voltage,EDM electrode current of online detection,and the use of PCI-1706U data acquisition card;designs the vibration displacement signal of laser displacement sensor detection as the chopper voltage control signal of pulse power supply;uses digital potentiometer to replace the original mechanical potentiometer,ultrasonic power supply,the output resistance of the digital potentiometer controlled by MCU STM32communication.By the tools of Visual C++6.0design of compound ultrasonic EDM detection and control system software,through the data acquisition card library programming,data acquisition,processing,display functions including the signal detection module design parameters;design the control software module through the serial port.Compared with the manual control parameters,the control system of ultrasonic combined electrochemical machining test can guarantee precision,improve the process stability and machining efficiency.