Research On The Key Technology In Robot Belt Grinding Of Aero-engine Blade

Aero engine blades are the key parts of aero-engine,its manufacturing quality and machining precision have important influence on Aero-engine Performance.For aero-engines,the compressor capacity of compressor blade directly determine compression ratio,meeting the requirements of the blades can increase the compressor ratio and reduce the compressor stage,in order to reduce the quality of aero-engine and maximum raise the thrust-weight ratio.Therefore,it is great significance to develop the corresponding processing equipment to realize the automatic machining blade profile.The Aero-engine blade with complex structure is thin and easy to deform when processing,the remaining milling lines on blade after milling affect the aerodynamic performance of compressed gases,at the same time,the machining accuracy of intake and exhaust edges is difficult to guarantee.At present,the multi-axis CNC belt grinding machine developed in China can solve the machining problem and keep the precision requirement,but it cost too much,therefore,need to find ways to reduce costs and ensure the quality assurance.The purpose of this paper is to study how to process blade by using robot to achieve the blade robot belt grinding,using the grinding head structure with floating belt compensation function investigate the feasibility of belt grinding of blade robot.The main research of this paper is as follows:(1)According to the characteristics of blade surface modeling and abrasive belt line contact machining,present the machining scheme of six axis robot;combined with the characteristics of low positioning accuracy of the robot,the abrasive belt grinding head device should be designed and manufactured with compensation structure.(2)Study on the processing technology of abrasive belt grinding blade,plan the machining locus of blade,determine the processing step and cutter attitude by combining with the double vector coordinate machining characteristics of abrasive belt grinding.Establish the transformation rule of the coordinate system based on the analysis of the motion characteristics of the six axis robot,the position of the robot is solved by the method of first position and back pose,Finally,generate the corresponding machining instructions.(3)Realize the integration of robot and grinding head by using robot IO interface and abrasive belt grinding head PLC controller,after communication between the robot and the abrasive belt grinding head is completed,the servo motor is controlled by PLC according to the relevant control information and realize the grinding wheel grinding pressure open loop control.According to the characteristics of blade,make the theoretical documents needed for the three coordinate blade detection and detect the relative point margin,3D model is reconstructed by the test results and the machining allowance of the machining point is extracted to control grinding pressure,the grinding pressure is controlled to realize the precise material removal.(4)Carry out the experiment of the robot belt grinding by using the experimental platform,use three coordinates to detect the blade after grinding,analyze the results and determine the feasibility of the scheme.