Full Featured DSP On-line Monitoring And Control System Oriented To Micro-hole Drilling

Microcellular Processing is widely used and take a great proportion in Micro Precision Machining with the precision and miniaturization and integration of modern industrial manufacturing.The high-speed drilling, compared to laser processing, electron beam and electrical discharge machining, take advantages in its low cost, flexible operation, high accuracy hole wall and disadvantages in its easily broken bit and dispersion lifespan. At present, monitoring system, composed of computer, data acquisition cards, single-chip, which controls the microporous process by testing drilling parameters, is the most widely use of Micro-hole Drilling in Online Monitoring. Such monitoring device characters relatively low computational speed, inadequate hardware resources, and relatively simple instruction, unsuitable for a weak, fast digital signal processing and control, all these undoubtedly reduce the real-time system and the utilization of the bit. Therefore, the development trend of on-line monitoring technique is to exploit monitoring system adopting hardware platform with higher speed to treat the weak, fast digital signal.With the sophistication of DSP technology development, DSP digital signal processing have strong advantages than the IPC, single-chip and other systems. In this paper, I set a multi-functional on-line monitoring control system platform that concludes human-computer interaction and human-machine communication cored in DSP TMS320F2812. This system can control sports feeding system and tool wear warning by monitoring the spindle motor current signal and Micro-hole Drilling tool condition. This system integrates DSP technology, power technology, sensor technology, electrical and mechanical control techniques, study the micro-hole drilling full-featured online monitoring system in the following areas: hardware, software, digital signal processing, study the system-curing process, in accordance with the experimental data and reliability theory to determine the threshold monitoring.The hardware system includes: Micro-drilling machine, Hall Current Sensor, TMS320F2812 board control functions, the system power supply, power amplifier and so on. In this paper, I focus on the main function of the system board, design and explain its reset circuit, clock circuit, A / D sampling interface, both inside and outside the extended memory, DSP simulation interface (JTAG), LCD display and keyboard input output control device. The highly integrated DSP platform simplify the monitoring system and improve the monitoring performance.Software system is designed by the integrated development platform based on MATLAB and supplemented by CCS. I graphically design DSP control procedures, and set algorithm model under the integrate exploit environment of the DSP2812 progrmme platform designed by the MATLAB-c2000lib, and simulate monitoring system in Simulink environment. After stimulation, the executable code is got and loaded to the target DSP board which running automatically. and proceed hardware connections, program run and debug consequently by applying Real-Time Workshop. By detecting the function of the entire system and procedures for the operation, confirmed the feasibility of monitoring system. Finally, use the CCS platform develope the LCD display output and keyboard input to control peripheral procedures and software systems to curing dsp chip.Wavelet treatment is adopted to analyze signal. The real-time analysis of the signal using wavelet method is more accurate and reliable. Such more reliable monitoring signal could be got in order to enhance the preciseness and the reliability of the whole system.Test results show that the multi-functional micro-drilling monitoring system based on TMS320F2812 could collect, filter, and compute on the current signal of the spindle motor. This system can also forecast the state of the bits, which has provided a more efficiency way for the on-line monitoring for the drilling process. DSP reduces the difficulty of monitoring methods before with less equipments and higher mobility. Besides, this method improves the monitoring speed, providing the whole system with the feature of real-time.At last, we made the conclusion that the limit of the difference of motor voltages obeys the Weibull distribution, according to the experiments and K-S testing to which the mould of the on-line monitoring was established.In this paper, experiments were made to test the threshold of on-line monitoring system under different reliability level, taking the reliable voltage difference as monitoring threshold. Which can avoid the broken of drill in drilling effectively under expectation. The new system is real-time, reliable and effective.