Abstract
Cooling of machining operations by liquid nitrogen is a promising approach for reducing cutting temperatures, increasing tool life and improving the workpiece surface integrity. Unfortunately, the cooling fluid tends to evaporate within the supply channel. This induces process variations and hinders the use of nitrogen cooling in commercial applications. In this work, the coolant is applied via the tool’s rake face during orthogonal turning of Ti-6Al-4V. The effect of a nitrogen supply pressure adjustment and a subcooler usage—proposed here for the first time for machining—is analyzed in terms of process forces, tool temperatures and wear patterns, taken dry cutting as a reference. Thereby, reliable cooling strategies are identified for cryogenic cutting.
Highlights
Cooling strategies of machining processes are economically and ecologically relevant, since high efforts arise for the supply, maintenance and disposal of conventional cutting fluids
The substitution of these cutting fluids is a promising approach moving towards environmental friendly production
Dry and cryogenic orthogonal turning of Ti-6Al-4V is presented in this paper
Summary
Cooling strategies of machining processes are economically and ecologically relevant, since high efforts arise for the supply, maintenance and disposal of conventional cutting fluids. In the machining of low strength materials such as aluminum alloys, dry cutting strategies and minimum quantity lubrication are used [1]. These strategies are not suited for Ti-6Al-4V, which is a commonly applied titanium alloy and a difficult to machine material [2]. The high strength and low heat conductivity of Ti-6Al-4V lead to high cutting temperatures and diffusion of the chemical reactive titanium into the tool material [3]. This causes adhesion of titanium carbides on the rake of tungsten carbide tools.
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