| With the development of high-precision technology,the application of difficult-to-cut materials is becoming more and more extensive,and its contribution to industrial production is also increasing.Traditional mechanical cutting has high requirements on tools,and the tool wear during the machining process affects the cutting performance.It has become more and more difficult to meet the requirements of production and processing,and high-efficiency EDM has its unique advantages,but the existing control methods are simple in thinking and cannot achieve advanced intelligent processing requirements.The purpose of this paper is to focus on difficult-to-machine parts in aerospace Design a special high-efficiency EDM milling machine control system.The following are the results and conclusions of this article: The application of intelligent controllers on open EDM machine tools is still mainly based on the previous generation of PMAC and UMAC.This article is aimed at Power PMAC.Based on the characteristic requirements of the controller,the electrical system of the machine tool was researched and designed.On this basis,in order to realize the functional mode of the EDM machine tool,the human-computer interaction page was developed,and the overall design of the software and hardware system of the numerical control system was completed.The application of intelligent controllers in open EDM machine tools is still mainly based on the previous generation of PMAC and UMAC.In this paper,according to the characteristic requirements of the Power PMAC controller,the machine tool electrical system is studied and designed.The functional mode,the development of human-computer interaction pages,and the completion of the overall design of the CNC system’s software and hardware systems.The servo control of the open EDM machine tool is less intelligent.Among them,the spindle rotation is mainly controlled by PID,and some simple models are still used for the feed retraction,such as the direction and speed control based on the threshold,which cannot give full play to the high-efficiency EDM machining performance.For the spindle rotation,after studying fuzzy control,a servo control model based on fuzzy PID is established and the simulation test is completed.Aiming at the problem of low intelligence of the feed-back control method,PID control is introduced,and the PID parameters are preliminarily optimized through simulation after the model is established.At the same time,in order to realize the function of electrode feeding and retreat,the voltage detection circuit between the electrodes is designed to isolate the upper computer controller from the voltage between the electrodes,and the voltage information can be collected at the same time.Design experiments to further optimize and adjust the values of proportional coefficient,integral coefficient and differential coefficient under the action of current intensity,arc pulse width and arc pulse interval,and analyze the influence of current intensity,arc pulse width and arc pulse interval on machining The effect of efficiency and electrode relative wear rate.Experiments are also designed to study the influence of the reference voltage threshold on the processing efficiency.Finally,the processing parameters that improve the material removal efficiency and reduce the relative wear of the electrode are obtained.A comparison experiment between the direction speed control based on the threshold and the processing using this feed-back control strategy was carried out.The experimental results show that,compared with the threshold-based directional speed control method,the PID-based feed control strategy has greatly improved the processing efficiency. |
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