高マンガン非磁性鋼の被削性 (快削鋼<特集>)

概要

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Clarifiying the machining mechanism of a high Mn non-magnetic steel which has long been called a representative material hard to be machined an investigation was made about its proper cutting conditions. Also, another investigation of changing it into a free machining steel was made.(1) Comparing SCMnH3 (1.0C-13Mn) with SUS304 its principal force, shear stress on the cutting shear plane and the frictional stress on tool rake face are as higher as 1.3, 1.4 and 2 times than those of SUS304 respectively. (in case of V=60m/min)(2) The cutting temperature of SCMnH3 is about 1.4 times at the high temperature side.(3) In cutting SCMnH3, the most proper tool is M20 under different processing conditions. Although TiC-coated tool and Borazon tool are suitable for continuous cutting but these are improper for intermittent cutting.(4) In the face milling, DN body type cutter is recommendable and in this case favorable "down-cutting" can be obtained. Further, tip-chamfering should not be employed.(5) It was confirmed that cutting tool life of 0.7C-15Mn-1.2Ni steel and 0.5C-9Mn-7.5Ni-7.5Cr steel as well as SCMnH3 can be widely improved by Ca/Al treatment.
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