Micro-grinding of Micro-grooved Rake Surface of CBN Cutter Influencing Dry Cutting Temperature

Micro-grooves on tool rake surface can improve cutting performance,but it is very difficult to perform a micro-machining towards superhard CBN cutter.Thus,a micro-grinding is proposed to fabricate 54 um-height micro-grooves on CBN cutter rake surface for dry cutting of steel.A metal-bonded #600 diamond wheel V-tip is employed to fabricate micro-grooves along different orientations to cutting edge;heat-up experiments are performed to analyze the correlation between rake surface temperature and cutter tip temperature;dry cutting experiments of #45 steel are performed to investigate the effects of micro-groove orientations and cutting conditions on dry cutting temperature.It is shown that the regular and smooth micro-grooves on CBN cutter rake surface may be machined.Rake surface temperature may be used to predict cutter tip temperature because they are very relative.The parallel and diagonal micro-grooves on cutter rake surface produce quicker hear transfer,which can contribute to excluding cutting heat from cutter tip.It is confirmed that parallel micro-grooves on cutter rake surface may decrease dry cutting temperature by 18%compared with traditional plane cutter.However,diagonal and vertical micro-grooves produce the largest cutting temperature because the cutting edge shape due to micro-grooves is changed.In the case of large removal rate,parallel micro-grooved cutter produces much less cutter tip temperature than diagonal and vertical micro-grooved cutters,leading to much less cutter wear.