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Frontiers of Mechanical Engineering

ISSN 2095-0233

ISSN 2095-0241(Online)

CN 11-5984/TH

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Front Mech Eng    0, Vol. Issue () : 231-246    https://doi.org/10.1007/s11465-012-0334-3
FEATURE ARTICLE
Toward the development of process plans with reduced environmental impacts
Fu ZHAO1(), Vance R. MURRAY1, Karthik RAMANI1, John W. SUTHERLAND2
1. School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA; 2. Environmental and Ecological Engineering, Purdue University, West Lafayette, IN 47907, USA
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Abstract

Manufacturing process planning serves as a pivotal link between design and manufacturing. Process planning decisions play a critical role in determining the cost and environmental impacts associated with manufacturing. Past efforts to address environmental issues during process planning are briefly reviewed and potential approaches that can achieve reduced environmental impacts are then discussed. A proposed method is presented for environmentally conscious process planning. The method begins with an existing process plan, and then identifies impactful process steps, and associated design features, in terms of manufacturing cost and environmental impact. Alternative processes that can achieve these features are then considered to generate alternative process plans. These alternatives are then evaluated in terms of economic and environmental performance. The results of these evaluations are then used to generate a set of process plans that are non-dominated with respect to manufacturing cost and environmental impact objectives to produce a Pareto frontier. The proposed method is demonstrated using the manufacturing of a prosthetic hip shell as a case study.

Keywords process planning      life cycle assessment (LCA)      sustainable manufacturing      prosthetic hip shell     
Corresponding Author(s): ZHAO Fu,Email:fzhao@purdue.edu   
Issue Date: 05 September 2012
 Cite this article:   
Fu ZHAO,Vance R. MURRAY,Karthik RAMANI, et al. Toward the development of process plans with reduced environmental impacts[J]. Front Mech Eng, 0, (): 231-246.
 URL:  
https://academic.hep.com.cn/fme/EN/10.1007/s11465-012-0334-3
https://academic.hep.com.cn/fme/EN/Y0/V/I/231
Fig.1  Conceptual model of a prosthetic hip shell
Fig.2  Conceptual model of a prosthetic hip assembly
Workstation/ProcessProcess labelMachineProcess time/min
Cut blankP1Stock cutting saw6
Turn outside diameter, bore and turn inner diameter, and drill and tap holeP2CNC turning center27.0
Perform porous metal coating preparationP3Hand tools5.4
Apply porous metal coatingP4Plasma spray chamber5.1
Remove unwanted porous coatingP5Hand tools12.8
Polish radiusP6Polishing lathe2.1
Apply fine ceramic blastP7Sand blaster1.7
Clean partP8Power washer2.7
Etch on product IDP9Laser1.0
PassivateP10Passivation system4.2
Tab.1  The process plan for the prosthetic hip shell
P1P2P3P4P5P6P7P8P9P10
Ci,m$ 0$ 15.93$ 0$ 9.09$ 0$ 0$ 0$ 0$ 0$ 0
Ci,L$ 0.47$ 11.35$ 1.47$ 1.38$ 3.48$ 0.88$ 0.47$ 0.64$ 0.25$ 0.17
Ci,T$ 6.15$ 48.52$ 4.88$ 10.58$ 11.60$ 3.77$ 1.55$ 2.59$ 1.00$ 0.68
Ci$ 6.62$ 75.80$ 6.35$ 21.05$ 15.08$ 4.65$ 2.02$ 3.23$ 1.25$ 0.85
Tab.2  Variables for the cost of each process in the process plan for the hip shell (all variables have units of $/part)
P1P2P3P4P5P6P7P8P9P10
SourceSPSPSPMPPP
Etip0.000.840.001.600.010.010.250.630.130.23
Eidle0.000.450.0017.500.010.190.170.002.360.09
Ebasic0.030.570.009.800.020.010.300.000.000.00
Ei0.031.860.0028.900.040.210.720.632.490.33
αenergy0.740.740.740.740.740.740.740.740.740.74
Ienergy0.021.380.0021.410.030.160.530.461.850.24
Tab.3  Variables for the calculation of the energy related carbon footprint for each process in the process plan (all energy terms have units of kW·h/part, is in kg COe/kW·h, and is in kg COe/part)
P2P4P10
Mat1Machined chips (Ti-6Al-4V) [M]Metal powder (Ti-6Al-4V) [M]Nitric acid [E]
Mat2Rapeseed oil-based cutting fluid [E]--
Mat3Cutting insert (carbide) [E]--
m10.2660.050.05
m25.3--
m30.1--
α119.263.33.2
α20.02--
α382.3--
Im13.452.890.16
Tab.4  Variables for the calculation of the mass related carbon footprint (all mass terms have units of kg/part, is in kg COe/kg, and is in kg COe/part)
Database EntryNotes
α1,2TiAl6V4 I (IDEMAT 2001)Assumes end of life scenario found in Ref. [77]
α2,2Rapeseed oil, at regional storage; Water demineralized ETH S; Glycerine, from rapeseed oil, at esterfication plant/CH, SAssumes oil makeup as found in Ref. [78]
α3,2Customized based on SiC at plant, RER/SUses calculation as found in Ref. [79]
α1,4TiAl6V4 I (IDEMAT 2001); Electricity avg. kW·h USAUses energy data for powdered metal as found in Ref. [80]
α1,10Nitric acid, 50% in H2O, at plant/RER S
Tab.5  The SimaPro/Ecoinvent database entry and related notes for each α
P1P2P3P4P5P6P7P8P9P10
Ienergy0.021.38-21.410.030.160.530.461.850.24
Im-13.45-2.89-----0.16
μe0.0214.82-24.310.030.160.530.461.850.40
Tab.6  Variables for the calculation of the total carbon footprint of each process (all variables have units of kg COe/part)
Fig.3  Percent of total manufacturing cost and carbon footprint by process
Fig.4  Impactful Feature 2, a shell with a threaded hole
Fig.5  Impactful Feature 4, a porous metal coating
Fig.6  FPN for the impactful feature of a hip shell with a threaded hole
Estimate rangeP2,AP2,BP2,CP2,D
Ci,mLow$15.93$8.48$12.25$8.48
High$9.33$13.47$9.33
Ci,LLow$11.35$6.68$5.71$8.76
High$8.17$6.63$11.09
Ci,TLow$48.52$38.22$34.55$59.84
High$49.43$45.24$81.03
CiLow$75.80$53.39$52.50$70.47
High$66.93$65.33$94.83
Tab.7  Values for the manufacturing cost ($/part) of each process in the FPN for the hip shell
Estimate levelP2,AP2,BP2,CP2,D
IenergyLow1.380.480.690.63
High0.711.020.98
ImLow13.454.405.554.40
High5.796.945.79
μeLow14.824.886.245.03
High6.507.976.76
Tab.8  Values for the total carbon footprint (kgCOe/part) of each process in the FPN for the hip shell
Fig.7  The cost and the carbon footprint of the manufacture of the prosthetic hip shell for the original process plan and the three alternate process plans
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