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Energy and carbon footprint analysis for machiningtitanium Ti-6Al-4V alloy

Rajemi M. F., Mativenga P. T., Jaffery S. I.

Journal of Machine Engineering

2009

Vol. 9, No. 1

103--112

Titanium alloys are increasingly being used in manufacturing especially in aerospace industries. The environmental impact of using this material is rarely discussed especially with regards to energy consumption and its contribution to carbon emissions. The poor machinability of titanium leads to lower material removal rate and longer machining time. Coupled with high carbon footprints encountered, in extracting this material from ore, it is clear that the environmental impact of using this material needs to be optimised. In the research reported here, cutting tests were undertaken on a lathe and milling machine using unified cutting conditions. The associated energy and carbon footprints were analysed and discussed with emphasis on high speed machining. The paper clearly shows the impact of process choice and cutting speed on environmental footprints as a key performance measure in sustainable manufacturing.

Machinability analysis from energy footprint considerations

Rajemi M. F., Mativenga P. T.

Journal of Machine Engineering

2008

Vol. 8, No. 2

106--113

Recent global developments have heightened the need to choose the best sustainable manufacturing methods in order to mitigate the effects of industrial processes on the environment. Energy consumption is seen as one of the key performance indices for assessment of the environmental credentials of an enterprise. It is through energy consumption that the carbon emission penalty (amount of carbon emitted in generating the energy) can be estimated. Machining remains one of the key discrete-parts manufacturing processes and its mechanics has received considerable attention in research and development. However, energy analysis for machining processes is a relatively new area. In this paper the environmental impacts of machine utilisation are assessed through energy consumption. The paper considers the energy requirements in machining of a number of alloys according to recommended cutting conditions. The energy is accessed through electrical power requirements of the machining process. The results illustrate the impact that high speed machining could have on energy consumption and hence a more sustainable machining industry.