Research And Design Of High Precision Oil-cooled Machine Controller System

In recent years, with the development of science and technology, high precision machiningplays an increasingly important role. Stability of Numerical Control machine tools is the assuranceof high precision processing. The key factor influences the machining accuracy of NumericalControl is thermal error. Oil-cooled machine can cool down the temperature of lubricating oil ofmachine tools to stabilize temperature of working machine tools, and reduce the thermal error withguaranteeing machining accuracy. Now domestic oil-cooled machine is inaccurate, so working outthe high precision controller of oil-cooled has very important practical significance.The paper analysis both sides of machine hardware and software. From the MATLABsimulation results, the controller design realized the high precision temperature control. And itfinally finishes high precision oil-cooled machine design.First of all, this paper analyzes the current situation in application of oil-cooled machine, and itis based on analyzing the current situation of oil-cooled machine controller.The paper puts forwardthe global design scheme of high precision oil-cooled machine controller. And for the program, thepaper make a large amount of analysis and research based on the precision measurement ofguarantee and the realization of the precision controlling.Then, on the basis of the oil-cooled machine controller global architecture, designed oil-cooledmachine controller hardware circuit which is based on the STM32, a study on switch power supplycircuit, phase sequence detection circuit, temperature measurement circuit, alarm input outputcircuit, temperature control and alarm output circuit, electronic expansion valve control outputcircuit and control circuit, TFT touch screen STM32processor peripheral circuit is done. At thesame time, I make corresponding introduction for the design of hardware circuit of electromagneticcompatibility notably particularly, and realize it in the PCB circuit.The paper also introduces the software realization of the controller for high precision ofoil-cooled machine. And it does an analysis for transplantation of μC/OS-II. The paper introducesthe driver programming implementation for TFT touch screen, as well as the realization of highprecision measurement, phase sequence detection function.Then the paper introduces the implementation of the designed circuit in this project. And itputs forward the problem that should be payed attention on the hardware circuit of the testing andruntime. On the temperature field measurements, and the measured data were analyzed, and theerror compensation. The paper analyses the temperature control algorithm and illustrates the advantages anddisadvantages of PID algorithm and fuzzy control algorithm. In addition, it combines them,realizing the complementary of merits and demerits to improve temperature control accuracy of oilcooler. And the paper makes detailed instructions of the theory of PID control, the fuzzy controlrules, and the control parameters of the generation step. Finally, I do the simulation on MATLAB.The experimental result proves that the use of PID control algorithm with fuzzy control canimprove the accuracy of temperature control in large extent.Finally, the paper studies and summarizes the design work, and does evaluation and prospecton the design of the high precision of oil-cooled machine controller.