Transcript The Design for Manufacture (DFM) Process

Product Development in Off-Site
Construction
Design For Manufacturing
By Dr Mohammed Arif– licensed under the Creative Commons
Attribution – Non-Commercial – Share Alike License
http://creativecommons.org/licenses/by-nc-sa/2.5/
Layout
 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
Manufacture
Process Design
Component
Design
DFM Methodology
(Boothroyd, et.al. 2002);
Organisational Issues
DFM Approach
Product Design
Product design principles for efficient manufacture
Number
of parts
Modular
design
Multi-use
Standard
components
Ease of
fabrication
Multifunctional
handling
Design for Assembly (DFA): Process & Methodology
(Boothroyd, 2005);
Properties that are of
interest to designers
Complete
Systematic
Measurabl
e
User
friendly
Design considerations
number of
parts
Cost of
parts
Fastening
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:
Check lists
Differentiation
Commercial Strategies
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), 625-636.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), 179-192.
• Kuo, T.C, Huang, S.H. and Zhang, H. C., (2001), “ Design for manufacture
and design for X”, Computers & Industrial Engineering 41, PP. 241-260.
• Precision Metal, (1975), “Design for assembly”, July, 8-26.
• Stoll, H.W., (1988), “Design for Manufacture”, ME, PP. 23-29.
• 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, 77-91.