Soft measurement method and system of tool nose point displacement mobility of machining center

Abstract

The invention provides a soft measurement method and a soft measurement system of tool nose point displacement mobility of a machining center, and belongs to the technical field of vibration measurement. Experimentation testing is combined with finite element analysis to conduct the soft measurement of the tool nose point displacement mobility on tools which are arranged in the machining center and have different geometrical characteristics. According to the soft measurement method and the soft measurement system of the tool nose point displacement mobility of the machining center, direct testing of p2b2b and n2b2b is avoided, instead, the p2b2b and the n2b2b are solved through testing of H11 and H12, H11 and H12 are values which are easier to test, times of experimental tests are reduced, the tool nose point displacement mobility of all tools in a machining center tool magazine can be theoretically forecasted through a plurality of times of tests after the tools are installed, the test cost and test expenses are greatly reduced, no accurate modeling needs to be conducted on main shaft-tool handle, forecasted result incredibility caused by errors in a modeling process and errors in a parameter identification process is avoided, and maneuverability is strong when the soft measurement method and the soft measurement system of the tool nose point displacement mobility of the machining center are applied to engineering. According to the soft measurement method and the soft measurement system of the tool nose point displacement mobility of the machining center, a plurality of times of theoretical prediction can be conducted after one test, obtained tool nose point displacement mobility is the basis for forecasting flutter, and milling machining flutter forecasting can be conducted.

Description

technical field [0001] The invention belongs to the technical field of vibration testing, and in particular relates to a soft measuring method and system for the displacement admittance of a tool tip point of a machining center. Background technique [0002] With the wide application of high-speed machining technology in aviation, automobile, and mold fields, the requirements for machining efficiency and metal removal rate in machining are getting higher and higher. However, in high-speed machining, the regenerative chatter of the machine tool will cause the vibration of the tool, seriously affect the processing quality and tool life, and limit the increase of the spindle speed. Theoretical prediction of chatter and the use of safe and reliable processing parameters for processing are of great significance. Current research shows that the occurrence of chatter is related to the frequency response function of the tool nose point and the spindle speed. [0003] The amplitude...

AI Technical Summary

Problems solved by technology

However, because the traditional response coupling method needs to measure the frequency response function of tool holder rotation angle-bending moment, it is difficult to accurately implement the measurement of rotation angle and the application of bending moment in engineering applications.

Therefore, there is no applicable method to theoretically predict the frequency response function of the tool tip of the machining center.

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