Dimensional analysis and ANN simulation of chip-tool interface temperature during turning SS304

OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 4 selected cutting insert was 0.8 mm, and the edge radius of the insert was approximately 20 μ m. Turning experiments were performed on the CNC lathe. The chip-tool interface temperature was investigated under dry turning at cutting speeds of 140, 200, and 240 m/min, feed of 0.08, 0.14, 0.2, and 0.26 mm/rev, and a constant depth of cut 1 mm. The cutting parameters were decided based on a literature review, machine capability, and recommendations of the cutting tool manufacturer. In machining, the temperature generated has a wider and critical impact on machining performance. During machining, the power consumption is mainly converted into heat near the cutting edge of the tool. Almost all the work performed during plastic deformation turns into heat. In the present study, the law of the thermoelectricity ( Seebeck effect ) principle was used to correlate the difference in temperature between the hot junction and the cold junction of two dissimilar materials with the generated electromotive force ( EMF ). However, the presence of third material would be undesirable as it can alter the fi nal output due to the formation of parasitic EMF at the second junction. As it alters the fi nal output, precautionary measures are required to be taken to eliminate it. Therefore, insulation of the work/tool material plays important role in getting accurate results from the tool-work thermocouple method. Initially, the workpiece was clamped with the help of chuck and supported by using the tailstock center while machining. Therefore, care was taken to isolate the workpiece from the jaws of the chuck. The workpiece was insulated by using a special type of Te fl on tape and bush as shown in Fig. 1. Also, the chuck jaw pressure was adjusted and kept as optimum to prevent penetration of the jaws across the insulation. After insulating the workpiece from one end i.e., from the chuck, insulation of the workpiece from the Ta b l e 1 The ISO speci fi cations of cutting insert and tool holder Particulars Details ISO designation of cutting insert CNMG120408 (MG-MS) Including angle 80° Rake angle –6° Clearance angle 5° Approach angle 95° ISO designation of tool holder PCLNL2525M12 Fig. 1. Insulation of the workpiece with the inserted plugs