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• Electric
V/////////M m
Dry consumption
H Coolant
Q Lubricant oil
™ Cutting tool
S Metal chip
100 300 500
Cost JPY

Figure 4: Analyzed cost results of case study

CONCLUSIONS

1. The evaluation model of environmental burden for machining operation has been proposed and
evaluation system has been developed. The feasibility of the developed system is also
demonstrated through case studies.
2. CO2 is a dominant environmental burden in machining operation about the global warming by
comparing with equivalent CO2 emission of CH4 and N2O.
3. It is found that relationship of the emission factor of global warming and the cost for the machine
tool operation isn't always the proportional through the analysis.

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