On-line monitoring and early warning method of milling cutter status during complex curved surface machining

Abstract

The invention provides an on-line monitoring and early warning method for the state of a milling cutter in the machining process of a complex curved surface, and belongs to the field of equipment failure diagnosis. According to the method, on the basis that the linear relation between the milling force and displacement signals of vibrating eddy current of a cutter handle is verified, the secondary frequency domain integral of acceleration signals measured by a three-direction acceleration sensor in the X direction and the Y direction of the end of a machine tool spindle serves as vibrating displacement signals of the cutter handle, the fundamental frequency and harmonic signals of the integral displacement signals are extracted to serve as monitoring signals, on the one hand, the shortcomings in displacement detection through an eddy current displacement sensor directly in the machining process of the curved surface are overcome, and on the other hand, the influence of interference signals are effectively removed; and the monitoring signals are further processed through synchronous and average cumulant of the time domain, the synchronous and average cumulant waveform is drawn through the characteristic quantity in a quantitative mode, and the state of the milling cutter is monitored according to the change of the characteristic quantity.

Description

technical field [0001] The method for on-line monitoring of milling cutter status during impeller processing according to the present invention belongs to the field of equipment fault diagnosis and involves three aspects: selection and processing of monitoring signal types, extraction of feature information, and selection and calculation of feature quantities. Background technique [0002] With the development of aero-engines, compression and other large precision mechanical devices towards high load, high efficiency and high reliability, the surface processing quality of the impeller, the key part of them, is required to be higher and higher. Due to the complex structure of the curved surface of the blade and the narrow space between the blades, the tool holder needs to use a large overhang during the machining process, which can easily cause chipping, wear, and damage to the milling cutter fixed at the bottom of the tool holder. [0003] The surface processing quality of t...

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Problems solved by technology

[0005] On the basis of verifying that there is a linear relationship between the milling force and the eddy current displacement signal of the tool handle swing, the present invention uses the acceleration signals in the X and Y directions of the end of the machine tool spindle measured by the three-way acceleration sensor, and compares the acceleration signals in the secondary frequency domain The integral is used as the tool holder displacement signal, which overcomes the disadvantages of direct displacement detection through the eddy current displacement sensor in surface processing. On the basis of using the time domain synchronous average cumulant method to de-interference the integrated tool holder vibration displacement signal , proposed to use the fundamental frequency and its harmonic signal in the integral displacement signal as the monitoring signal, which solved the problem of online monitoring and early warning of milling cutter status in the process of complex curved surface processing

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