lecture 12: design for manufacture - mit opencourseware · •design for manufacture ... custom...
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D-Lab Spring 2010
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Today in class:
• Review of the Design Process • Design for Manufacture
– No Spare Parts • Books Assignment • Readings
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D-Lab Design for Manufacture
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DfM Definition:
Adapting a design to make it more easily manufactured and to reduce its manufacturing costs.
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DfM Definition:
To give consideration at the design phase of a product how it will be manufactured.
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Planning
Production
Testing and Refinement
Detail Design
System-Level Design
Concept Development
DfM in the Product Development Process
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Special Considerations for Developing Countries
• Job creation • Resource availability • Supply chains • Scale • Replicability
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Raw Materials
Equipment & Tooling Off-the-Shelf
Manufacturing Costs
Overhead Assembly Components
Labor
Custom Labor
Equipment & Tooling
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Four Paradigms
• Manufactured locally Assembled locally Maintained locally
• Manufactured in urban
centers Assembled locally Maintained locally
• Manufactured in urban centers
Assembled in urban centers
Maintained locally
• Manufactured in urban centers
Maintained in urban centers
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Commonly Available Materials
Get pictures of:
roofing material
car parts
© source unknown. All rights reserved.This content is excluded from our CreativeCommons license. For more information,see http://ocw.mit.edu/fairuse.
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Car Parts
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Bicycle Parts
© source unknown. All rights reserved. This content is excluded from ourCreative Commons license. For more information, see http://ocw.mit.edu/fairuse.
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Best Live-Action Manufacturing in Developing Countries Short Film
Image of “Oscar” film award trophy removed due to copyright restrictions.
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Jigs & Fixtures
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Keys to DfM in Developing Countries
• Understand manufacturing capabilities
• Incorporate the most accessible, affordable manufacturing techniques into your detailed design
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Design for Assembly
"a process for improving product
design for easy and low-cost
assembly, focusing on functionality
and on assemblability
concurrently.”
--Vincent Chan & Filippo A. Salustri
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Design for Assembly
• Reduce cost of assembly • Improve quality and reliability • Reduce part inventory • Reduce production equipment
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Special Considerations for Developing Countries
• Job Creation • Resource Availability • Scale • Repeatability
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Assembly Methods
• Manual assembly • Fixed automatic
assembly • Flexible automatic
assembly Annual Production Volume
Ass
embl
y Cos
t pe
r Pr
oduc
t
Robotic Assembly
Manual Assembly
Automatic Assembly
Image by MIT OpenCourseWare.
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Design Guidelines for Manual Assembly
• eliminate the need for workers to make decisions or adjustments.
• ensure accessibility and visibility.
• eliminate the need for assembly tools and gauges (i.e. prefer self-locating parts).
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Basic DFA Guidelines • minimize the number of different parts -
use "standard" parts.
• minimize the number of parts.
• avoid or minimize part orientation during assembly (i.e. prefer symmetrical parts).
• prefer easily handled parts that do not tangle or nest within one another.
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Basic DFA Guidelines • Minimize part count by incorporating
multiple functions into single parts
• Modularize multiple parts into single subassemblies
• Assemble in open space, not in confined spaces; never bury important components or components that require maintenance
• Make parts such that it is easy to identify how they should be oriented for insertion
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Basic DFA Guidelines • Prefer self-locating parts
• Provide alignment features
• Eliminate fasteners
• Don’t put fasteners in places where you can’t get access to
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EC.720J / 2.722J D-Lab II: Design Spring 2010
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