工具の衝撃緩和に関する研究 : 第3報衝撃時の加速度による検討

概要

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In cutting work, it is an important problem to prevent the breakdown of cutting tools. The relaxation of shock on the tool, is an effective way in this problem. This paper explains that the produced shock to the tools depends on physical characteristics (mass, spring-constant, damping ratio, natural frequency) of tool holders, and then describes the experimental results which are done based on above considerations. Intermittent cutting experiments are done with four types of tool holders, and shocks produced to each holder are compared. In this study the shock is grasped as an acceleration caused by deflection of tool bits. Experimental results show that three types of shocks are produced under intermittent cutting. First shock is produced by radical decrease of cutting force. Second is caused by a clash between the tool bit and workpiece. After the clash, the last one is produced by the tool bit that starts recutting. Regarding these shocks, the first shock is relaxed by the increase of damping ratio of holders, and second is relaxed by the decrease of mass and spring constant of holders. However, the last shock shows complex phenomena produced by various cause, and explanation about these phenomena may be future problems.
東海大学の論文