Abstract
Air-cooling and dry machining are both being trialled as possible solutions to the metal cutting industry's long running problems of extending tool life, reducing tool failure and minimising the heat generation at the tool tip. To date, large amounts of expensive coolant which cause both environmental damage and health hazards have had to be used. The introduction of dry machining is the goal of today's metal cutting industry that tirelessly endeavours to reduce machining costs and impact from chemicals in the environment. Modern tool tips are already capable of maintaining their cutting edge at higher temperatures, but even with these improvements in tool materials, the cutting edge will eventually break down. Applying cold air to the tool interface of these modern tool tips will also help prolong their tool life reducing the cost of metal cutting. Dry machining incorporating air being directed on to the tool interface is considered in this paper as a possible alternative for harmful liquid-based cooling. However, low convective heat removal rates associated with conventional air- cooling methods are generally inadequate for dissipating intense heat generation in the cutting processes and suitable improved cooling methodologies have yet to be established.
Highlights
In this research examines the operational effectiveness of a Ranque-Hilsch vortex tube being used to cool tool tip during machining
The RanqueHilsch vortex effect was discovered in the early 1930s when it caused considerable excitement, as it demonstrated that it was possible to produce hot and cold air by supplying compressed air to a tube
At first it is hard to believe that such a device can produce hot and cold air and at a useful flow rate
Summary
In this research examines the operational effectiveness of a Ranque-Hilsch vortex tube being used to cool tool tip during machining. When the air continues to swirl along the tube the more energy separation will occur by axial convection while it moves towards the hot end During this progression, the heat will be transferred from the core air to the outer air. The equation implies that in the inner core, where the value of ra (radial distance measured from the centre of the tube to the particular molecule in concern) is small, there should be a corresponding increase in the molecule’s angular velocity, wa, to allow for the conservation of the total angular momentum in the system This is assuming that there is negligible mass difference, ma, between any two-air molecules in the tube. Equation 13 and 14 can be used to show the consistency of the first law of thermodynamics for test carried out on the vortex tube
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