Emergy-based life-cycle assessment (Em-LCA) for sustainability assessment: a case study of laser additive manufacturing versus CNC machining

Sustainability of laser additive manufacturing needs to be evaluated for finding an optimal compromise between technical development and sustainable performance. The emergy-based life-cycle assessment (Em-LCA) methodology is applied to investigate the sustainability of laser engineered net shaping (LENS) by comparing that of the computer numerical control (CNC) machining for gear manufacturing. Based on the emergy accounting methodology, the emergy-based sustainability index (ESI) is constructed to indicate the sustainability of the two technologies. In addition, contributions of different processes in the two manufacturing options to the final sustainability have been identified for future improvement. The results indicate that Em-LCA offers a practical sustainability assessment tool. The sustainability of the LENS process is much higher than that of the CNC machining. In the end, several countermeasures are proposed to improve the sustainability of the manufacturing technologies.

[1]  Hong-Chao Zhang,et al.  Environmental benefits of remanufacturing: A case study of cylinder heads remanufactured through laser cladding , 2016 .

[2]  Sergio Ulgiati,et al.  Quantifying the environmental support for dilution and abatement of process emissions The case of electricity production , 2002 .

[3]  Benedetto Rugani,et al.  Integrating emergy into LCA: Potential added value and lingering obstacles , 2014 .

[4]  Rehan Sadiq,et al.  Emergy-Based Life Cycle Assessment (Em-LCA) of Multi-Unit and Single- Family Residential Buildings in Canada , 2014 .

[5]  Emergy Analysis Defined,et al.  Emergy Accounting for Assessing the Sustainability of Wastewater Management Systems , 2013 .

[6]  Timothy G. Gutowski,et al.  An Environmental Analysis of Machining , 2004 .

[7]  Kui‐Qing Peng,et al.  Emergy evaluation of the sustainability of Chinese steel production during 1998–2004 , 2009 .

[8]  Rehan Sadiq,et al.  Emergy-based life cycle assessment (Em-LCA) for sustainability appraisal of infrastructure systems: a case study on paved roads , 2014, Clean Technologies and Environmental Policy.

[9]  Cihan Özel,et al.  Research of production times and cutting of the spur gears by end mill in CNC milling machine , 2011 .

[10]  Jinhui Li,et al.  Sustainability evaluation of e-waste treatment based on emergy analysis and the LCA method: A case study of a trial project in Macau , 2013 .

[11]  Michael Zwicky Hauschild,et al.  From Life Cycle Assessment to Sustainable Production: Status and Perspectives , 2005 .

[12]  Tao Li,et al.  Comparative study for environmental performances of traditional manufacturing and directed energy deposition processes , 2018, International Journal of Environmental Science and Technology.

[13]  Yaoyao Fiona Zhao,et al.  A framework to reduce product environmental impact through design optimization for additive manufacturing , 2016 .

[14]  Yang Man,et al.  Views on Standard of Indoor Air Quality (GB/T 18883-2002) , 2003 .

[15]  Eric Coatanéa,et al.  Comparative environmental impacts of additive and subtractive manufacturing technologies , 2016 .

[16]  Bhavik R. Bakshi,et al.  A thermodynamic framework for ecologically conscious process systems engineering , 2000 .

[17]  Barbara Linke,et al.  Sustainability of abrasive processes , 2013 .

[18]  H. Odum,et al.  Self-Organization, Transformity, and Information , 1988, Science.

[19]  Sergio Ulgiati,et al.  On boundaries and ‘investments’ in Emergy Synthesis and LCA: A case study on thermal vs. photovoltaic electricity , 2012 .

[20]  Mark T. Brown,et al.  Emergy-based indices and ratios to evaluate sustainability: monitoring economies and technology toward environmentally sound innovation , 1997 .

[21]  Bin Chen,et al.  Analysis of Resource and Emission Impacts: An Emergy-Based Multiple Spatial Scale Framework for Urban Ecological and Economic Evaluation , 2011, Entropy.

[22]  R. Poprawe,et al.  Laser additive manufacturing of metallic components: materials, processes and mechanisms , 2012 .

[23]  David Dornfeld,et al.  A Three Dimensional System Approach for Environmentally Sustainable Manufacturing , 2012 .

[24]  Robert L. Bowerman,et al.  Introduction to the Additive Manufacturing Powder Metallurgy Supply Chain , 2015 .

[25]  J. K. Watson,et al.  A decision-support model for selecting additive manufacturing versus subtractive manufacturing based on energy consumption. , 2018, Journal of cleaner production.

[26]  Simon Ford,et al.  Additive manufacturing and sustainability: an exploratory study of the advantages and challenges , 2016 .

[27]  Vladimir Navrotsky,et al.  Comparative Energy, Resource and Recycling Lifecycle Analysis of the Industrial Repair Process of Gas Turbine Burners Using Conventional Machining and Additive Manufacturing , 2017 .

[28]  Sung-Hoon Ahn,et al.  A comparison of energy consumption in bulk forming, subtractive, and additive processes: Review and case study , 2014 .

[29]  Xiao Feng,et al.  Distribution of emergy indices and its application , 2007 .

[30]  Shun Jia,et al.  Emergy based sustainability evaluation of remanufacturing machining systems , 2018 .

[31]  Silvia Bargigli,et al.  An emergy evaluation of complexity, information and technology, towards maximum power and zero emissions , 2007 .

[32]  Jeremy Faludi,et al.  Comparing Environmental Impacts of Additive Manufacturing vs. Traditional Machining via Life-Cycle Assessment , 2015 .

[33]  Silvia Bargigli,et al.  Overcoming the inadequacy of single-criterion approaches to Life Cycle Assessment , 2006 .

[34]  Andrew G. S. Cuthbertson,et al.  Environmental monitoring of economically important invertebrate pests in Bramley apple orchards in Northern Ireland , 2006 .

[35]  Alan C. Brent,et al.  A conceptual framework for energy technology sustainability assessment , 2011 .

[36]  Yourun Li,et al.  Evaluating waste treatment, recycle and reuse in industrial system: an application of the eMergy approach , 2003 .