モード連成により発生する自励びびり振動の検知 : 第1報, 検知基準の検討

概要

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The purpose of this study is to define criterion of detecting self-excited chatter caused by mode coupling of workpiece system on a lathe. Theoretical study on relation between cutting conditions (direction of principal axes of workpiece system and width of cut) and vibration properties of workpiece system was carried out, on assumption that workpiece system is two degrees of freedom and is composed of a mass and two kinds of spring and damper system assigned to their principal axes. Theoretical stability limit of mode coupling chatter and vibration properties versus direction of principal axes of workpiece system were calculated. The following conclusions were reached as a result of some comparative consideration about them. (i) Difference between natural frequencies of workpiece system decreases with increase of width of cut under stable cutting conditions in the direction of principal axes of workpiece system where mode coupling chatter may occure. (ii) Phase angle between the vibrations in the directions of principal axes of workpiece system is from 30 degrees to 90 degrees under unstable cutting conditions.
社団法人日本機械学会の論文
1998-09-25