Research On Robotic Belt Grinding Method And Processing Quality Control Strategy For Repaired Blade

Remanufacturing of damaged blades is an important stage in the whole life cycle of aero-engine system,which is recognized as an important link to ensure the rapid recovery of combat effectiveness and effective implementation of combat technology training tasks,mainly including damage detection,additive repair,cast repair,post heat treatment and service index evaluation.The profile precision and surface quality of remanufactured blades are directly determined by the polishing process,which has an important impact on their service performance and fatigue life after maintenance.Robot abrasive belt grinding technology has been gradually applied to precision machining of Aeroengine Blades,which can basically meet the quality requirements of blade machining.However,the shape,position and size of the cladding layer are random,the distribution of residual is different and the surface quality is poor,which brings a series of challenges to the repair work.For this reason,this paper carries out the relevant research on the blade repairing robot belt grinding from three aspects of grinding device,grinding method and grinding quality control(1)Based on the repairing surface grinding characteristics and robot belt grinding characteristics,the hardware selection and variable stiffness grinding device design were carried out,the robot belt grinding platform was built,the compliance law and force position mapping relationship of the grinding device were analyzed,and the control ability of the device on grinding pressure was proved.(2)Based on the significance analysis of belt grinding process system and grinding quality influencing factors,the construction scheme of grinding signal test system is established.The scheme design of signal acquisition and conditioning is carried out,and the test software is developed based on Lab VIEW programming environment.The test functions of force and vibration signal acquisition,preprocessing,data management and signal analysis are realized,and the friendly man-machine interface is designed.(3)The detection and model processing methods of repaired blade were studied,the layered processing strategy of repaired blade cladding layer was proposed,and the trajectory planning method and robot off-line programming method were studied,which provided the technical route and research foundation for the robot high-quality and efficient grinding of repaired blade.(4)A grinding quality control method is proposed.Based on the experimental data of additive manufacturing plate,the correlation law between process parameters,state parameters and processing quality and the optimization principle of process parameters are established.Then the verification experiment of the copying of the three types of damaged samples of profile,edge and blade tip is carried out.The results show that the copying accuracy is better than 0.07 mm,The surface roughness is better than Ra0.4,the stress state is obviously improved,and the composite quality meets the processing requirements of repaired blade.