プラズマジェットによる岩石類の溶断 (第1報)

セメントモルタルの場合 (1)

抄録

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 cut
H=electric input power=VA/3.6×10⁴v kWh/m
V=voltage, A=ampere, v=feed rate of plasma jetcm/sec
H₀=heat quantity of molten cementm ortarcal/cm³k=thermal conductivity of cement mortar cal/cmsec°C
T_m=melting temperature of cement mortar°C
α=thermal diffusivity of cement mortar cm²/sec