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Research on Dual Frequency Excited Cutting Method of Metal Bar

Airong Zhang  Chunjian Hua  Haojing Ren  
【摘要】:The efficiency and quality problems in the cutting method of metal bar under dual-frequency excitation were studied.Through establishing the crack growth time model of bar with V-groove,the influencing factors of cutting efficiency were analyzed.The polynomial of related variables was extracted to draw function images to analyse the influencing rules of different factors on cutting process.By the experimental study of metal bars with different shape parameters,the correctness of the crack growth time model is verified.Based on the analysis of fracture mechanics theory,a method of separating bar stably and rapidly under dual-frequency excitation is proposed.The method uses the loading mode of high frequency excitation superimposing decreasing low frequency excitation.The cutting results of different section quality are obtained by setting three kinds of low frequency excitation with different decreasing laws,which proves that the purpose of controlling section quality can be achieved by controlling the decreasing form of low frequency signal.

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