A novel approach to develop the turning tool for cryogenic internal cooling

The LN₂ internal spray cooling, achieved through channels integrated within the tool, facilitates the delivery of liquid nitrogen to the vicinity of the cutting edge, thereby enabling precise cooling of the cutting area and enhancing the cooling efficiency of the liquid nitrogen. The implementation of LN₂ internal spray cooling necessitates specialized tools. However, there is currently a lack of comprehensive technology for the development of such tools. Building on previous research, this study further optimizes the turning tool for LN₂ internal spray cooling. The impact of nozzle structures on the jet characteristics is investigated, and the effect of the outlet elbow angle on cavitation is analyzed. Additionally, an insulation structure for the primary liquid nitrogen transmission channel is designed. A comprehensive development method for the turning tool utilizing LN₂ internal spray cooling is proposed. Using TA15 titanium alloy as the experimental material, the optimized tool results in an approximate 23% reduction in cutting temperature, a 20% decrease in surface roughness, and a 25% reduction in tool wear.