Experimental Study And Simulation Of Machining Deformation On Propeller Blade

The propeller is the core component of the vessel,the quality and performance of which are important factors to the vessel's power and stablity.The machining accuracy of the propeller scale model affects the result of the test,and indirectly affects the service performance.The blade of the propeller scale model has the characters of complicated surface structure,small thickness and long overhanging,and it may produce machining deformation caused by cutting force during machining process,which leads that it is diffcult to control the machining error and improve the processing efficiency.In this dissertation,the research mainly invloves the propeller scale model,in which the processing scheme of each stage is developed,the joint simulation technology of ANSYS and MATLAB software is achieved and applied to the calculation of deformation of the blade.Besides,the distribution regularity of the deformation of the blade under different working the machining deformation of the blade is analyzed and the feasibility is verified by experiments.The processing scheme is developed based on the structural characters of the propeller scale model in this paper,and different processing methods are choosed for the blade processing in different regions,and the appropriate measures are developed for the technical problems in the machining process.The approriate measure method is developed base on the structural characters and accuracy requirement of the propeller scale model,and then the measurement results are analyzed.A cutting force prediction model in five-axis machining surface is established based on the machining process of the propeller scale model,and the method of calculating the elastic deformation in the NC milling process of free-form surface is researched.Considering the coupling relationship between cutting force and elastic deformation,an iteration relationship for calculating the elastic deformation of free-form surface blade during machining.The iterative program is written and the joint simulation considering the interaction between the cutting force and the elastic deformation is achieved by using the data transfer between ANSYS and MATLAB software.The cutting force in the finish machining process is predicted by calibrate the cutting force coefficient.The elastic deformation on each cutter contact point of the blade under different process methods are predicted by using the joint simulation technique,and the accuracy of the deformation simulation is verified by blade processing experiment.The regularity of the machining deformation is predicted by calculating the machining deformation of the whole blade surface under different process methods.The processing scheme and the joint simulation technique of the machining deformation are applied on the processing of a certain propeller scale model,and the finish machining of the blade is accomplished by optimizing the tool path mode,and then the accuracy of the machining deformation regularity and the feasibility of the tool path mode optimizing are verified.