TY JOUR TI ANALYSIS OF SOLID LUBRICATION EFFECT UPON SURFACE HARDENING OF HIGH-SPEED STEEL TOOLS DURING SHARPENING KW solid lubrication KW cBN disk KW sharpening KW high-speed steel KW cold-hardening KW cold-hardening depth KW cold-hardening degree JO Bulletin of Bryansk state technical university AU Panayoti, V.. PY 2016 IS 2016 PB Bryansk State Technical University