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/

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

ConceptProcess 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);

Complete Systematic Measurable

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), 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.