Comparisons of machining cost in hard turning of AISI 4340 steel with different cermet tools.
|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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