| With the development of market economics of China, the competition of domestic and international markets are becoming increasingly acute. Since the contour of aero-product is more complex gradually, the with higher precision and the demand of NC machine is modification has been an researching subject in our company currently.The author has performed the further research and analysis for the NC machine modification on the basis of the constant consultation of abundant relative documents, which focuses on describing the design of control system of the machine. NC system is the centralization of the whole control system; the CNC system, electrical control system and the servo system can be operated coordinately and uniformly via the design of programmable controller so as to realize the NC .It also describes the content and step of the system adjustment of the whole NC machine, which systematically analyses the PLC control procedure of NC machine, adjustment process of coordinate servo system and the machine-linked operation based on the design of NC modification. The NC system has been adjusted and located to optimize the whole control of the by adjusting the parameters of CNC machine. The special functionof the machine has been developed through selecting its strong anon function to analyze the reason of error generated and the has been modified successfully.
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