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

OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 4 The volumetric speci fi c heat of work material (  c ) and the thermal conductivity ( k ) of work material (at 500 o C) are referred to from the literature and considered as 502 J/kg-K and 21.5 W/m-K. A 0 is the cross- sectional area of the chip and is obtained by taking the product of the chip thickness ( a c ) and the chip width ( a w ) for the given cutting conditions. The speci fi c cutting pressure ( S p ) is obtained by dividing the cutting force ( F c ) with the product of a feed and depth of cut. The tangential cutting force ( F c ) was measured by a Kister-9257B type cutting force dynamometer and average chip width and chip thickness were measured using a digital micrometer. The values for the constants obtained are C 0 = 1.24, m = 0.154, and n = 0.226 for uncoated carbide tool and C 0 = 1.97 and 6.63, m = 0.083 and 0.0432, n = 0.169 and 0.1605 for TiAlN and TiN / TiAlN coated carbide tools, respectively. Substituting these values in Eq. (10), the fi nal equations to predict cutting temperature with uncoated, TiAlN coated and TiN / TiAlN coated carbide tools are given as Eqs. (11), (12), and (13), respectively. For uncoated carbide tool, 0,154 0,452 0,226 0 28, 5636 ; p S V A  = (11) For TiAlN coated carbide tool, 0,083 0,338 0,169 0 416, 5 ; 528 p S V A  - = (12) For TiN / TiAlN coated carbide tool, 0,0432 0,321 0,1605 0 . 167, 9887 p S V A  = (13) From the indicators S p , V and of developed Eqs. (11)–(13) it can be seen that the chip-tool interface temperature depends more on the cutting speed, followed by the chip cross-sectional area and the speci fi c cutting pressure. However, these parameters can be seen as more prominently affecting the cutting tempera- ture for uncoated carbide tool followed by single-layer TiAlN coated carbide tool and multi-layer TiN / TiAlN coated carbide tool. The chip-tool interface temperature for uncoated carbide, single-layer TiAlN coated and multi-layer TiN / TiAlN coated carbide tools at different cutting conditions is calculated using Eqs. (11)–(13), respectively, and is shown in Table 6. Ta b l e 5 The cutting force, chip thickness, and chip width at cutting conditions stated in Table 2 Expt. no. Uncoated tool TiAlN coated tool TiN / TiAlN coated tool F c (N) a c (mm) a w (mm) F c (N) a c (mm) a w (mm) F c (N) a c (mm) a w (mm) 1 410 0.287 1.64 354 0.3 1.5 329 0.24 1.47 2 630 0.370 1.86 536 0.32 1.8 460 0.3 1.73 3 702 0.480 1.9 610 0.35 1.83 570 0.37 1.77 4 387 0.260 1.72 318 0.28 1.663 321 0.22 1.59 5 554 0.360 1.87 498 0.3 1.76 448 0.28 1.72 6 636 0.473 1.92 582 0.33 1.83 555 0.35 1.78 7 365 0.200 1.87 366 0.27 1.646 315 0.19 1.66 8 501 0.330 1.86 512 0.29 1.733 440 0.26 1.7 9 630 0.467 1.92 556 0.315 1.84 545 0.34 1.78