Study On Four Axis Plunge Milling Technology For Propeller Of AUV

Underwater vehicles(AUVs),especially Autonomous Underwater vehicles(AUVs),are widely used in remote control reconnaissance,ocean surveying and mapping,Underwater salvage,pipeline inspection and other fields.As an important technical equipment developed by various countries,AUVs are in great demand and widely used.The AUV propeller is the key component to power it.The geometrical shape of AUV propeller is complex,the machining precision and the surface quality are high,the variety and the batch is small,so the AUV propeller is mainly dependent on the numerical control five-axis machining at present,but the equipment cost and the manufacturing cost are high,and the production efficiency is low,which seriously restricts the application and development of AUV technology in China.Therefore,in order to reduce the equipment threshold,reduce the manufacturing cost and improve the production efficiency,this paper proposes a four-axis insert milling machining method,and studies the process parameter optimization method of four-axis insert milling.The structural characteristics and technical requirements of AUV propeller are discussed.By analyzing the machining characteristics of multi-axis machine tool,a more economical machining method based on four-axis insert milling is proposed.The feasibility of machining AUV propeller with four axis insert milling is analyzed from the perspectives of feed direction and attitude and tool path planning.The process scheme of four axis insert milling AUV propeller is studied and analyzed.First of all,the paper analyzes the traditional contour machining method and the characteristics of the milling processing way,using ABAQUS finite element analysis software to insert four axis milling with the traditional hierarchical contour machining in the cutting area stress were analyzed,it is concluded that the milling surface,with four shaft plug milling way force smaller than traditional way contour machining of workpiece.Secondly,a testing platform for the than traditional way contour machining of workpiece.Secondly,a testing platform for the cutting force of the AUV propeller was built,and the experimental data of the cutting force were obtained by orthogonal experiment.According to the analysis of the experimental data,the milling force and milling torque of down-milling and down-milling are obviously smaller than that of down-milling and down-milling.On this basis,the mathematical model of cutting force was established based on the linear regression method.MATLAB software was used to process the experimental data,and the mathematical model of cutting force for the four-axis insert milling AUV propeller was obtained.The process parameters of roughing AUV propeller were optimized by software simulation,and orthogonal experiments were designed to study the effects of cutting speed,feed per tooth and radial cutting depth on cutting force.The results of software simulation are in good agreement with those of mathematical model and experimentFinally,the surface quality requirements of AUV propeller were used as the evaluation basis for the optimization of finishing parameters.Orthogonal experiments were set to study the effects of cutting speed,feed per tooth and horizontal row spacing on surface roughness.