Study On Five-axial HSC Technology Strategy Of Closed Axial-flow Impeller

In the field of turbomachinery,the axial flow closed impeller with good overall structure and high strength is usually used as the working part,so as to improve the running performance of the equipment.However,due to the complex structure of the closed impeller,the flow channel is twisted,the space between the blades is narrow and the processing requirements are high,so the cutter location planning of the axial flow closed impeller is difficult and the processing is difficult.In the manufacturing industry,usually the use of welding methods,through the processing of parts of the impeller,and then combined together,and finally complete the manufacture of the impeller.The use of this combination of processing technology is not conducive to improving the processing efficiency,the proportion of the product manufacturing cycle is very large,and the impeller structure parameters,performance can not be guaranteed.Therefore,five-axis Computer Numeral Control(CNC)machining technology,high-speed milling technology and high-end Computer Aied Manufacturing(CAM)software technology are used to study the five-axis high-speed milling process of axial closed-type impeller.The improvement of the structure is complicated,Of the product processing efficiency and processing quality has a good reference.First,in order to ensure the modeling accuracy of the axial closed-end impeller,the modeling principle and technology are analyzed and studied.Using the cubic B-spline technique,the control point of the impeller is obtained by MATLAB software,and the calculated control point data is introduced UG software,in the UG software to complete the closed impeller blade surface,the hub surface,the coating surface modeling,for the follow-up CAM programming and related mathematical calculations do pave the way.Secondly,the five-axis high-speed milling technology is analyzed,and the machining requirements and processing difficulties of the axial-flow closed impeller are analyzed.The processing stage is divided to determine the materialof the blanks required for the machining of the impeller,the structure of the initial blank,Fixture safe height calculation,fixture design,design and processing process card,thus completing the axial flow closed impeller processing technology planning.Thirdly,the calculation of the maximum internal cylindrical surface of the axial flow closed impeller flow path is completed by MATLAB software.The range of roughing of the fixed shaft is determined,and the finite element cutting analysis software is used to determine the cutting Angle range,and finally with the fixed axis plus high-speed milling to complete the closed-wheel impeller position planning.After the roughing is completed,aiming at the problem that the residual volume is not uniform and the residual amount is large,the tool path planning method is adopted,and the machining principle of the pipeline module of CAM software is adopted to complete the semi-finishing tool Trajectory calculation.In the semi-finishing CAM setting,the finishing machining parameters are changed to complete the calculation of the tool path.In the case of finishing interpolation,five-axis spline interpolation is used instead of linear interpolation.The principle of cubic polynomial spline interpolation,The calculation step is deeply studied,and the five-axis spline interpolation flow chart is designed.Finally,through the CAM software HyperMill combined with the above stages of the study of the knife position planning results,respectively,axial flow closed impeller of the various processing stages,in accordance with the order of processing technology to complete the CAM programming to complete the calculation of the tool path,and then HyperMill's Mof tool file into APT file,the use of UG post-processing module to develop five-axis spline interpolation post-processing,the use of Tcl language to prepare the relevant post-processing procedures,the preparation of the file after the completion of post-processing,and then in the simulation software NC program,and finally in the machine on the axial closed-type impeller for the actual processing and verification,proved the axial flow closed impeller processing technology correctness.