TY JOUR TI FIRMWARE REALIZATION FOR OPTIMUM CUTTING SPEED DEFINITION AT HARD-TO-MACHINE MATERIAL WORKING KW firmware realization KW TT20 titanium alloy KW 12H18N10T steel KW cutting speed KW cutting temperature KW hard-to-machine materials JO Bulletin of Bryansk state technical university AU Kozlova , M.. AU Serebrennikova, A.G. AU Kharina , O.. PY 2016 IS 2016 PB Bryansk State Technical University