| Large marine propeller blades are large thin-walled surface with irregular shape, anddeform easily when under the cutting force. In order to improve the processing quality andmachining efficiency, the modal frequencies and mode shapes of seven-five axis CNClathe milling machine tool machining propeller, clamping support positions distributionand the selection of the cutting parameters were studied in this paper.In order to avoid vibration occured in the seven-five axis machine during processingand improve the processing quality, the modal analysis of the machine was carried out toobtain the machine’s natural frequencies and shapes. The results of theoretical modalanalysis and experimental modal analysis were compared to prove the correctness oftheoretical modal analysis results. Display body constraint was applied to the machinetable. The results of the modal analysis of machine with table in elastomer and displaybody were compared in accuracy and computational efficiency. It could be proved themachine with table in display body has the same accuracy and better computationalefficiency.Propeller blades were deformed easily under the cutting force, for this problem,clamping support optimization procedure based on genetic algorithm was developed. TheANSYS software was used to compute the deformation. By using the ANSYS parametricprogramming language (APDL) the optimization procedure could run automaticlly, whichsimplified the operation process and improved the optimization efficiency.For the processing efficiency of propeller, cutting parameters optimization programbased on genetic algorithm was developed in this paper. The independent variables of theoptimization program were cutting depth, cutting width, and feed rate. The objectivefunction was material removal rate. Through the computation of the program, the bestmaterial removal rate could be got, when the deformations of the loading points were lessthan the allowable value. |
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