Open Access
Table 6
Comparisons of machining cost in hard turning of AISI 4340 steel with different cermet tools.
| No. | Costs | UCUT | UCSCT | UCSCTT | UCDCT | UCDCTT |
|---|---|---|---|---|---|---|
| 1 | Cost associated with machine and operator, Rs.550/hr. (x) | Rs. 9.17/min | Rs. 9.17/min | Rs. 9.17/min | Rs. 9.17/min | Rs. 9.17/min |
| 2 | Machining cost per piece (xTm) | Rs. 28.79 | Rs. 28.79 | Rs. 28.79 | Rs. 28.79 | Rs. 28.79 |
| 3 | Tool changing cost per piece [xTd(T m /T)] | Rs. 6.54 | Rs. 5.14 | Rs. 4.36 | Rs. 3.51 | Rs. 3.06 |
| 4 | Cutting insert cost per piece | Rs. 450 | Rs. 450 | Rs. 450 | Rs. 450 | Rs. 450 |
| 5 | Cost associated with surface treatments of tool substrate | Rs. 0 | Rs. 180 | Rs. 230 | Rs. 430 | Rs. 470 |
| 6 | Average value of single cutting edge (y) | Rs. 112.5 | Rs. 157.5 | Rs. 170 | Rs. 220 | Rs. 230 |
| 7 | Machining cost per piece over tool life [y(T m /T)] | Rs. 16.06 | Rs. 17.66 | Rs. 16.18 | Rs. 16.85 | Rs. 15.37 |
| 8 | Total machining cost per piece, (2+3+7) | Rs. 51.39 | Rs. 51.59 | Rs. 49.33 | Rs. 49.15 | Rs. 47.40 |
Machining length (L) = 100 mm, uncut w/p diameter (D) = 40 mm, machining time per piece (Tm) =  = 3.14 min, machine downtime (Td) = 5 min. |
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