せん断形切りくず生成による工具振動の励起
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概要
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In machining β-brass, it is well known that chip is produced discontinuously in a periodical manner and this type of chip formation often induces the forced chatter vibration of machine-tool. When the cutting system is rigid enough, it is found experimentally in orthogonal cutting that chip size and cutting force are not changed with variation of cutting speed, while the size and the maximum of the periodical force are proportional to undeformed chip thickness though the minimum force is kept unchanged. Assuming these characteristics to be applicable to the cutting with weaker tool system, where undeformed chip thickness and cutting speed vary dynamically in accordance with the tool deflection, it becomes possible to predict dynamic behavior of the system and occurrence of the forced chatter through a numerical analysis of vibration equation with usual lumped parameters which have to be measured separately. The analysis shows that frequency of the tool vibration is decreased by lowering the tool stiffness, and strong chatter of tool's natural frequency takes place and continues above a certain cutting speed. It is also shown that wave forms of the tool vibration and the finished surface change from saw-tooth type to irregular type, and further to trigonometric function type of the chatter vibration as cutting speed is increased. These results are all verified experimentally, however, the quantitative agreement is not satisfactory enough due to over-simplifications involved in the analysis.
- 1984-07-05
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