Product Development in Off-Site Construction Design For Manufacturing By Dr Mohammed Arif– licensed under the Creative Commons Attribution – Non-Commercial – Share Alike License

 The Design for Manufacture (DFM) Process:  The DFM Objectives  DFM Methodology  Product design principles for efficient manufacture  Design for Assembly (DFA): Process & Methodology  Design considerations  Design for Manufacture / Assembly Systems (DFM/A)  Case studies  Other considerations in DFM/A

The Design for Manufacture (DFM) Process Product Concept Process Concept Design Goals

The DFM Objectives Product Concept Component Design Manufacture Process Design

DFM Methodology (Boothroyd, et.al. 2002); Organisational Issues DFM Approach Product Design

Product design principles for efficient manufacture Number of parts Multi-use Ease of fabrication Modular design Standard components Multi- functional handling

Design for Assembly (DFA): Process & Methodology (Boothroyd, 2005); CompleteSystematicMeasurable User friendly Properties that are of interest to designers

Design considerations number of parts Fastening Cost of parts Assembly Labour Finishing Product Warranty

Design for Manufacture /Assembly Systems (DFM/A)

Case studies Ford Motors Braun & Sharp NCR Group

Other considerations in DFM/A: Commercial Strategies Differentiation Check lists

Test Questions: answer True or False In the DFM process, design goals would include both manufacturing and product goals. (T/F) Ans. T up to 60% or more of production decisions are directly determined by the product design. (T/F) Ans. F Design for assembly as a central element of the design for manufacture, has three important characteristic. (T/F) Ans. F The DFM process begins with a proposed product concept, a proposed process concept, and a set of design goals. (T/F) Ans. T

References Boothroyd, G. (2005), “Assembly Automation and Product Design, 2nd Edition”, Taylor and Francis, Boca Raton, Florida, Boothroyd, G., Dewhurst, P. and Knight, W., (2002), “Product Design for Manufacture and Assembly, 2nd Edition”, Marcel Dekker, New York, Boothroyd, G., and Alting, L. (1992), “Design for assembly and Disassembly”. Keynote paper, Annals of CIRP, 41 (2), CII (1986) “Constructability: A primer.” Publication3-1. Construction Industry Institute, University of Texas, Austin. Chow, W. W. C. (1978). “Cost Reduction in product Design”. New York: Van Nostrand Reinhold. Corbett, J., Dooner, M., Meleka, J. And Pym, C., (1991), “Design for Manufacture”, Strategies, Principles and Techniques, Addison-Weskey Publishers Ltd. Ertas, A., & Jones, J. C. (1993), “The engineering design process”, New York: Wiley.

References Fisher, M. (1993), “Automating Constructability Reasoning with a Geometrical and topological project Model.” Computing Systems in Engineering, 4 (2-3), Kuo, T.C, Huang, S.H. and Zhang, H. C., (2001), “ Design for manufacture and design for X”, Computers & Industrial Engineering 41, PP Precision Metal, (1975), “Design for assembly”, July, Stoll, H.W., (1988), “Design for Manufacture”, ME, PP Stoll, H.W., (1986), “Product design for efficient manufacture”. Industrial Tech. Inst., Ann Arbor, MI. Terry, W. R., Karni,., and Richards, C.W. (1990) ” A knowledge based system for the integrated design and manufacture of round broach tools”, journal of Intelligent Manufacturing, 1,