単結晶CBN工具による鉄系材料の精密切削

概要

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Mirror-like cutting of ferreous metals with CBN cutting tools is discussed experimentally in this paper. For the purpose of the mirror-like cutting, single crystal CBN cutting tools are developed. The wearing test of the single crystal CBN is carried out to ascertain the optimum crystallographic orientation of flank surface. The wear resistance in <211> direction on (111) plane is the largest, so the (111) plane is chosen as the flank surface for single crystal CBN tools, and <211> direction on (111) plane as the cutting direction on the flank surface. The polished flank surface roughness of O.005-0.008 μmR_<max> can be obtained using fine diamond grinding wheel whose working surface roughness is kept within 1 μmR<max> Using this single crystal CBN cutting tool, machined surface roughness of less than O.05 μmR<max> has been achieved for hardened stainless steel (HRC 52). Although the tool lives in single crystal CBN tools have not been sufficient (about 200 m cutting length), the use of the new tools expected in a drastic reduction of the polishing time for the hardened stainless steel mold dies.
公益社団法人精密工学会の論文
1988-02-05