WORKING OUT OF IDEALISED MODEL OF DRILLING OF ROCKS WITH VARIOUS PHYSICOMECHANICAL PROPERTIES BY ROLLER BIT CHISELS
The problem of low speed of the drilling carried to a resource of the chisel tool without questions of durability is investigated. Conditions of the greatest possible productivity of the chisel machine tool equipped roller bit with a chisel without taking into account durability of characteristics are investigated. The physics of a mechanical way of destruction of rock is considered with the help elements for rock destruction. Dependence of mechanical speed of drilling on size of axial effort to the chisel tool is presented. It is allocated three zones: volume destruction; fatigue-volume destruction and fatigue failure. Dependence of mechanical speed of drilling on size of frequency of rotation of the chisel tool is presented also. The optimum size of frequency of the rotation, characterizing a parity of number of defeats of a face teeths roller bit chisels, speed and energy of impact in due course contact comes to light. Conclusions and recommendations about creation of the greatest possible productivity of the chisel machine tool equipped roller bit with a chisel without taking into account durability of characteristics are resulted.