Research on High-efficiency Adaptive Machining Technology of Machine Tools Considering Online Chatter Suppression
In the field of machining,there are a large number of complex structural parts with uneven machining allowances and large removals.Traditional machining methods lack the ability to control parameters and it is difficult to improve machining efficiency.A high-efficiency adaptive machining technology of machine tools considering online chatter suppression is proposed.First,based on fuzzy theory,a two-dimensional fuzzy controller is developed,which realizes the adaptive machining by collecting the spindle power signal during the machining process and adjusting the feed rate override in real time.Secondly,taking the weighted wavelet packet entropy as the characteristic value,the online identification method of cutting chatter is studied.A single-degree-of-freedom model of the machining system is established.By finding the optimal spindle speed without chattering in the machining system,based on the chatter frequency and the number of teeth,the chatter suppression based on the variable spindle speed is realized.Then,based on the relationship between the power,torque and speed of the spindle motor of the machine tool,the control strategy of the spindle speed and feed speed is formulated.And the high-efficiency adaptive machining of machine tools considering online chatter suppression is realized.Finally,the technology was verified by two sets of cutting comparison tests.The result shows that the technology can significantly improve the machining efficiency and suppress the cutting chatter during machining.
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