Large resection rate milling tremor monitoring method considering rigidity time-varying

Abstract

The invention relates to a large resection rate milling tremor monitoring method considering rigidity time-varying, and relates to the large resection rate high precision manufacture field with material resection rate above 80%; the monitoring method comprises the following steps: S10, cutter-workpiece coupling system time-varying transfer function modeling: substituting a relation between the transfer function and cutting force and displacement into a built displacement equation so as to obtain a cutter-workpiece coupling system time-varying transfer function model; S20, building a time-verying coupling transfer function online monitoring measuring system so as to monitor the transfer function in real time; S30, building a milling tremor stability kinetic model, substituting the transfer function value measured by the S20 into the kinetic model in the S30, monitoring tremor generation, and obtaining a non-tremor processing parameter scope; S40, providing a tremor optimization processing parameter control guide scheme according to the S30.

Description

technical field [0001] The invention belongs to the field of mechanical processing and relates to a chatter monitoring method, in particular to a chatter monitoring method for milling with a large cutting rate considering the time-varying stiffness. Background technique [0002] Machining chatter is an important factor affecting the accuracy of workpieces. Establishing a dynamic model of milling chatter stability is the first step in chatter monitoring. Stability dynamics modeling was first established by Tobias and Tlusty in the range of right-angle turning, and then researchers expanded the scope of application of the model, such as applications in milling and grinding. The dynamic model has experienced the development from single-degree-of-freedom modeling to multi-degree-of-freedom modeling, from low-speed machining to high-speed machining, modeling from time domain to frequency domain and time-frequency domain, and the dimension of cutting influencing factors from two-d...

AI Technical Summary

Problems solved by technology

It should be noted that after milling to a thin wall with a large material removal rate, the stiffness of the workpiece shows a time-varying decrease trend, and the dynamic characteristics of the tool-workpiece system become worse and lead to aggravated chatter. The traditional milling chatter monitoring will have errors , especially for high-speed and removal rate up to 90% of the machining process, this error will not be negligible

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