Effects of internal coolant circulation-based cooling schemes on tool wear in turning SUS304 stainless steel.

A tool life test was performed in the conventional (nonorthogonal) cutting mode to determine the effects of cooling schemes, based on the coolant circulation inside an indexable insert body, on cutting tool wear. Two cooling schemes — a Combined Scheme, in which the coolant enters the cutting zone through a channel inside the insert body, and an Internal Scheme, in which the coolant circulates in the channel inside the insert body without entering the cutting zone — were compared with the traditional external cooling and dry cutting. All schemes were performed by using a special (universal) turning tool prototype. The tests were conducted at cutting speeds of 180 m/min and 100 m/min, with a constant feed and depth of cut. The evaluation criteria were (based on ISO standard 3685:1993) flank wear VBb and crater depth KT at a minimum cutting time of 30 min (if the selected wear limit values had not been reached earlier). Additionally, the values of cutting force components and the parameters of the chips (shape, mass, length, etc.) were obtained for each tested scheme. The test results allowed us to draw conclusions not only about the effects of each proposed cooling scheme on the tool wear parameters, but also about the changes in the shear plane angle and shear strain values due to the use of each proposed scheme. [ABSTRACT FROM AUTHOR]