Research On The Key Technology Of CNC Machining Of Tracing Instruments For Aero-engine Maintenance

Aircraft engines are a core component of aircraft and their maintenance must be carried out to strict specifications and standards to ensure engine performance and reliability.The use of tracing instruments to manage the tracing of small parts of aircraft engines helps to optimise the maintenance process,reduce error rates,improve safety and ultimately improve overall maintenance quality and efficiency.Plastic materials are widely used in the manufacture of tracers due to their machinability,formability,wear resistance and chemical resistance.However,when CNC machining plastic tracers,there are often problems with the plastic sheet material sticking to the tool during machining,warping and deformation.These problems not only affect processing efficiency and product quality,but also increase production costs and maintenance difficulties.This paper focuses on two key technologies for the prevention of tool sticking and warping during CNC machining of tracers.The main research work is as follows:(1)Analysis of the machining characteristics of aero-engine tracers.In view of the problems of long processing time and low accuracy in the traditional machining process of the tracer,the analysis of material selection,process parameters,equipment selection and other process solutions was carried out,and an optimized improvement plan for CNC machining based on complex contour mapping method was proposed,and the process improvement and cutting parameters were studied.(2)Research on anti-sticky tool technology for CNC machining of shaped tracing apparatus.Based on the TRIZ innovation theory,the functional structure of the machining centre spindle mechanism is analysed by applying the system analysis method and the causeeffect analysis method,the functional model of the tool sticking unit is established,and the solution of the anti-sticking device of the tracing plate(including 3 functions: internal tool cooling,water cooling of the tool-tracing plate milling point and real-time chip removal)is designed by applying the object-field model based on the functional requirements.The simulation software was used to simulate and analyse the anti-sticking mechanism.The results demonstrate that the mechanism is effective in preventing tool sticking and is proven in practice.(3)A support vector machine based machining parameter optimisation method is proposed for the tool sticking problem in plastic plate milling.By analysing the factors affecting the sticky tool results when milling plastic plates on CNC machines,a support vector machine optimisation parameter classification prediction model is established using the principle of grey correlation analysis,and the model is validated by combining the actual machining parameters.The results show that the model can effectively predict the sticking tool results corresponding to different machining parameters.(4)Anti-warp deformation technology for CNC machining of shape-shifter plates.According to the innovative design framework of TRIZ theory,the functional analysis of the warpage deformation system of the tracing apparatus was carried out and a functional model was established;the cause-effect analysis was applied to find the entry point of the problem;the technical contradiction analysis was applied to solve different conflicts,and the structural design of the anti-warpage deformation device was proposed and verified by using finite element analysis and simulation.The results of the practical application show that the design can effectively solve the warpage deformation problem in the processing of morphological instruments.