Analytical and Experimental Investigation on Cutting Temperature in Turning AISI 304 Austenitic Stainless Steel Using AlTiCrN Coated Carbide Insert
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Abstract
This study presents analytical and experimental results of cutting force and chip-tool interface temperature developed during turning of AISI 304 austenitic stainless steels using nano-crystalline AlTiCrN coated cemented carbide insert. The work-tool thermocouple calibration set-up based on the novel concept was developed. Inconel air heater of 1 KW capacity was used as a heating element at the work-tool junction for heating the junction steadily up to 1000 °C. The turning tests were conducted at cutting speeds in the range of 140 to 320 m/min, feed in the range of 0.08 to 0.26 mm/rev keeping depth of cut constant at 1 mm. The influence of cutting parameters and tool coating were investigated on the average chip-tool interface temperature and cutting force. A regression model for chip-tool interface temperature was developed considering the effect of cutting parameters. In addition, the experimental results were validated using the 'Boothroyd temperature model'. Experimentally an interface temperature of 979°C was observed whereas the model predicted 988°C temperature at 260 m/min cutting speed and 0.14 mm/rev feed. The interface temperature in turning is strongly dependent on the cutting speed followed by feed. The AlTiCrN coated shows excellent thermal stability due to the formation of stable Cr2O3 or and dense α(Al,Cr)2O3 mixed oxide scales. The developed interface model shows excellent fit and could be used effectively for predicting the interface temperature for the given tool and work material and cutting conditions.
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