Coolants are normally sprayed in the form of jet on the cutting zones to dissipate the heat while they pass through. Due to lack of positive mechanism to drive the coolants away, effective heat dissipation does not occur. This paper therefore puts forward a heat sink-based novel fluid flow approach for dissipating heat throughout drilling of titanium alloys. The intension of developing this system is to extract heat generated from the cutting zone positively, using convection due to ice water flow through heat sink channel. A highly conductive copper plates having a channel in it are used which act as a heat sink. Numerous drilling experiments were performed using dry and ice water cooling on titanium alloys. Thrust, torque, temperature, metallurgical and microstructural characteristics were measured to evaluate the efficacy of heat sink approach. Maximum of 29% reduction in the depth of deformation was found in the ice water cooling over dry drilling. Further, the EBSD scans reveal that the grain size increased with an increase of cutting speed in dry drilled surface as compared to ice water cooled surface. The average micro hardness was reduced by 5% at the entry and 17% at the exit location of the drilled hole in the ice water cooling over dry drilling.
Trivedi, D. B., Kumar, A., & Joshi, S. S. (2018). Drilling of Titanium Alloy using Heat Sink-based Ice Water Cooling. In Procedia Manufacturing (Vol. 26, pp. 633–644). Elsevier B.V. https://doi.org/10.1016/j.promfg.2018.07.074