Abstract
A tecnique of cutting metal by the plasma jet having super-high temperature and large momentum, has been much developed. However, a study on cutting rock-like materials has seldom been done.Results obtained from this study are as follows; that is, the sectional area of the cut groove is represented by the following equation, which agrees well with practice. whereη=heat transmission efficiency from plasma jet to material cutH=electric input power=VA/3.6×104v kWh/mV=voltage, A=ampere, v=feed rate of plasma jetcm/secH0=heat quantity of molten cementm ortarcal/cm3k=thermal conductivity of cement mortar cal/cmsec°CTm=melting temperature of cement mortar°Cα=thermal diffusivity of cement mortar cm2/sec
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