焼入鋼旋削時のセラミック工具の初期欠損(第2報) : 被削材硬さと切れ刃形状の影響

概要

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In the 1st report, a turning test was carried out with hardened steel SUJ2 (HRC66) and ceramic tools. The early fracture has been investigated experimentally. As a result, the method of expression has been proposed for the occurrence condition of the early fracture. This method consists of the maximum undeformed chip thickness and the critical cutting speed, and the relation of them can be described as a exponential equation. In this paper the usefulness of this method is clarified for work hardness (HRC42-62) and chamfer angle (0-55°). The main findings are as follows; (1) The early fracture occurs in cutting speed over a certain speed in both cutting of lower hard steel and with chamfered cutting edges. (2) The critical cutting speed is changed by the work hardness and the chamfer angle. (3) In these cases, the occurrence conditions of early fracture can be described by the method of this paper. (4) Therefore, the early fracture equation proposed in this paper is practically useful.
公益社団法人精密工学会の論文
1992-02-05