種々の硬さのクロムモリブデン鋼の旋削におけるCBN切削工具の切削特性

概要

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In this study, cutting tests with CBN tools are performed on chromium-molybdenum steels of various hardnesses in order to clarify the cutting characteristics and the influence of the workpiece hardness on the tool life of CBN tools in the turning of steels. Three types of CBN tools (CBN contents of 30%, 60% and 90% respectively) are tested in comparison with P 10 carbide and white ceramic tools. The flank wear and the amount of deposited metal on the tool flank are observed by using SEM and EPMA. The results obtained are as follows : (1) CBN tools are able to cut very hard steels of over HRC 60 which can not be cut with conventional carbide tools. (2) The flank wear of CBN cutting tool is affected by CBN content, where the CBN cutting tool of 60% CBN content indicates the longest tool life. (3) The flank wear of CBN cutting tool is mainly affected by the wear characteristics of the bond material of the tool.
1989-06-05