Analysis of cutting temperature during turning of SS 304 using uncoated and PVD coated carbide inserts

Abstract

Cutting temperature is one of the most important parameters controlling the tool wear and consequently the life duration and other parameters of the machined surface. Hence, it would be essential to do tool temperature measurements during machining tests. To understand the physical phenomena of temperature generated during cutting processes, especially in the machining of difficult-to-cut materials, the characterization of the temperature field is essential. In the present paper, an attempt is made to determine the tool-chip interface temperature using an experimental approach during the turning of SS 304 material. It is considered to be difficult to cut material due to its properties like low thermal conductivity, and work hardening. The application of tool-work thermocouple method is used for the experimental approach whereas the empirical model is prepared and validated based on experimental results. Cutting tests were carried out on SS 304 work material by using uncoated (K-313 grade) and TiAlN PVD coated (KC 5525) cemented carbide insert at the cutting speed of 140–260 m/min and feed of 0.08–0.20 mm/rev, keeping the depth of cut constant as 1 mm. Experimental observations indicate that temperatures generated during machining are strongly dependent on the cutting speed. The high temperature was observed during turning using TiAlN Coated tools. However, due to the better thermal stability of the coating, the coated tool performs 10–12 % more than the uncoated tool.