Detection system for tool chattering in milling and detection method thereof

Abstract

The invention discloses a detection system for tool chattering in milling and a detection method thereof, characterized by comprising following steps: 1), selecting a suitable displacement sampling window; 2), determining a center of a tool and vibration changes corresponding to the center of the tool by using a radius constrained least square method; 3), subjecting a tool vibration signal to empirical mode decomposition, and obtaining a time-frequency spectrum using HHT (Hilbert Huang transform); 4), verifying whether the time-frequency spectrum meets chattering rule. The invention has the advantages that the use of a non-contact detection method, using a laser displacement sensor, overcomes limitations such as size of a workpiece under processing, mass, a mounting mode, and high precision is provided; by studying the influence of milling chattering and tool eccentricity upon positional changes of the center of the tool, positional flutter of the center of circle of the tool is determined, and thus chattering change conditions of the tool are directly reflected; by using Hilbert Huang transform, the limitations of Fourier transform can be overcome and a time-frequency spectrum of signals can be better described.

Description

Technical field [0001] The invention relates to a detection system and a detection method for tool chatter in milling processing, and belongs to the technical field of processing detection. Background technique [0002] High-speed milling processing has outstanding advantages such as high production efficiency, high surface quality, low manufacturing cost and short product development cycle. It is widely used in aviation, aerospace, mold, automotive and other manufacturing industries to meet the continuous development of manufacturing needs. However, the many advantages of high-speed milling must be premised on the vibration-free and stable milling process at high speeds. During the milling process, due to the milling force and other uncertain loads, the process system tends to chatter. The occurrence of milling chatter will not only reduce the quality of the machined surface of the workpiece, but also affect the service life of the tool and even the lathe. In "Made in China 20...

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Problems solved by technology

[0004] In order to solve the deficiencies of the prior art, the purpose of the present invention is to provide a detection system and detection method for tool chatter in milling, which solves the difficulty and inefficiency in obtaining a large number of vibration signals in the current milling process. An issue where the analysis of flutter signals would also be affected by components not related to flutter

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