Tool cost is often used as the major criterion for justifying tool selection. Ei
ID: 2994405 • Letter: T
Question
Tool cost is often used as the major criterion for justifying tool selection. Either Silicon nitride (SiN)or PCBN insert tips can be used to machine (bore) cylinder block on a transfer line at a rate of 312,000 parts/yr (Material: gray cast iron). The operation requires 12 inserts (2 per tool) as six bores are machined simultaneously. The machine was run at 2600 sfpm with a feed of 0.014 in at 0.005 in. DOC for finishing. Here are some additional Data:
SiN PCBN
Insert tips/part 12 12
Tool life (Parts per tool) 200 4700
Cost per Tip $1.25 $28.50
a. What is the tool material that you would recommend?
b. on what basis?
Explanation / Answer
for 200 hrs ......... SiN .. $1.25
for 200 Hrs .. PCBN ..... 28.5*200/4700 .. $1.212
so PCBN is recommended , as it is costing lesser
thnx