Abstract
Manufacturing processes are performed to convert raw materials into products. To do this, natural resources are consumed and emissions are generated with potential for adverse environmental impacts. To obtain a productive system with fewer negative impacts on the environment, green manufacturing (GM) was used in this work, in which the environmental performance of an aluminum pipe machining was studied through the application of an integrated approach based on life cycle assessment (LCA) and eco-efficiency indicators. The proposed framework uses the unit process life cycle inventory (UPLCI) methodology followed by the eco-efficiency assessment to support decision-making in four levels: “win–win,” “lose-lose,” and two trade-offs reference-situations. The results contributed to the identification of the electricity and cutting fluid consumptions as the main life cycle hotspots to be minimized. Through a sensitivity analysis, future manufacturing scenarios were proposed to reduce the life cycle impacts based on eco-efficiency assessments. A “win–win” situation was found for the scenario that duplicates the number of parts manufactured at each production cycle, increasing from three to six machined parts per cycle, and reducing by 25% the volume of raw material to be machined. All of these enabled reductions in the life cycle impacts by up to 16.47% and has increased eco-efficiency by up to 23.55%. Finally, the integrated approach for LCA and eco-efficiency assessment can be used as an easy way to advance sustainability scenarios in manufacturing systems.
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Abbreviations
- CC :
-
Climate change
- CFused :
-
Volume of dirty cutting fluid generated by the process (in liters)
- Ee :
-
Eco-efficiency index, in units of manufactured product per unit of environmental impact
- Ee_baseline :
-
Eco-efficiency calculated with Eq. (3) for the baseline scenario
- FC :
-
Freshwater consumption
- FD :
-
Fossil depletion
- FEc :
-
Freshwater ecotoxicity
- FEu :
-
Freshwater eutrophication
- GM :
-
Green manufacturing
- HTc :
-
Human toxicity, cancer
- HTnc :
-
Human toxicity, non-cancer
- LCA :
-
Life cycle assessment
- LCT :
-
Life cycle thinking
- MD :
-
Metal depletion
- MP :
-
Fine particulate matter formation
- nc :
-
Number of cycles performed between a replacement and other (in units)
- np :
-
Amount of parts machined by the tool (in units)
- np :
-
Total amount of manufactured parts in one working day, in units
- PEI :
-
Potential environmental impacts depending on the impact category assessed, which can be expressed in kg CO2-eq., kg PM2,5-eq., kg oil-eq., m3, kg 1,4DB-eq., kg P-eq., kg Cu-eq., or kg SO2-eq., according to the impact category under investigation
- Relative Ee:
-
Eco-efficiency results in percentage units
- ƩTool:
-
Amount of tools consumed per part
- TA:
-
Terrestrial acidification
- TE:
-
Terrestrial ecotoxicity
- ToolZ:
-
Amount of tools used for machining (in units)
- UPLCI:
-
Life cycle inventory
- LCT:
-
Life cycle thinking
- volCFrep:
-
Volume of cutting fluid replaced (in liters)
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Funding
This research is financially supported by the National Council for Scientific and Technological Development (CNPq—grant numbers 302722/2019–0 and 406017/2018–2). José Augusto de Oliveira thanks to Sao Paulo Research Foundation (FAPESP) grant number 2020/11874–5.
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Alessandro Silveira Firmino: investigation, conceptualization, methodology, writing original draft, experiments, and data analysis. Erica Kushihara Akim: review and prepare the images and references. José Augusto de Oliveira: review, data analysis, supervision, and validation. Diogo Aparecido Lopes Silva: review, data analysis, supervision, and validation.
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Firmino, A.S., Akim, E.K., de Oliveira, J.A. et al. Green machining of aluminum pipes: an integrated approach for eco-efficiency and life cycle assessment in manufacturing systems. Int J Adv Manuf Technol 121, 6225–6241 (2022). https://doi.org/10.1007/s00170-022-09737-5
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DOI: https://doi.org/10.1007/s00170-022-09737-5