Unit 5 design for manufacturing

product design and development

1. Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 1: DESIGN FOR MANUFACTURING
OMF551 - Product Design and Development

2. Design for manufacturing
•The later development activities teams often
have difficulty linking needs and
specifications to the specific design issues
they face.
•For this reason, many teams practice “design
for X” (DFX) methodologies, where X may
correspond to one of dozens of quality criteria
such as reliability, robustness, serviceability,
environmental impact, or manufacturability.
2

3. THREE METHODS TO IMPLEMENT DFM
•Organization:
»Organize cross-functional teams


•Design Rules:
»Exercise best practices specialized by the firm


•CAD tools:
»Apply CAD system such as the
» Boothroyd-Dewhurst DFA software.
3

4. MAJOR DFM OBJECTIVES
•Reduce component costs
•Reduce assembly cost
•Reduce production support costs
4

5. MAJOR DFM OBJECTIVES
5
Design for Manufacturing (DFM) and design for assembly (DFA) are the integration
of product design and process planning into one common activity. The goal is
to design a product that is easily and economically manufactured.
Design for Manufacturing or Design for Manufacturability (DFM) is the optimization of a part,
product, or component's design, to create it cheaper and more easily. ... This allows a
manufacturer to identify and prevent mistakes or discrepancies.

6. Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 2: Reducing the component costs
and assembly costs
OMF551 - Product Design and Development

7. Reduce the costs of components
•Identify process constraints and cost drivers-
automatic laser cutting machine and a welding
process are the two best examples to explain this.

•Redesign components to eliminate processing steps
Main fold housing-(Materials)
•Variable cost
• Fixed cost (Mold tooling)
•Total direct cost (overhead charges)
•Total unit cost

8. •Choose the appropriate economic scale for the part
process
– Manufacturing costs drops as the volume of product increases called
ECONOMIES OF SCALE.
Example: Injection molded plastic part.

•Standardize components and their processes-
•Internal standardization- Use of 3.8 liter V6 engine in several GM
cars.
•External standardization- Use of 10mm socket head cap screw
across several auto manufactures.
•
– “
”.

9. •Choose the appropriate economic scale for the part
process

Adhere the black-box component- A component cost reduction
strategy used effectively in the Japanese auto industry is called black box
supplier design.
– Successful black box development requires “careful system- level design
and extremely clear definitions”.

10. Reduce the costs of assembly
•Design for assembly (DFA) is a fairly subset of DFM
that involves minimizing cost of assembly.

•DFA index = (theoritical minimum number of parts)*(30 seconds)
/Estimated total assembly time

•Integrate parts (using the Boothroyd method)
–Integration of several features into a single component.
–The EGR return and vacuum, source parts are
molded into the redesigned intake manifold.

11. Reduce the costs of assembly
•Maximize ease of assembly (adapated from Boothroyd
and Dewhurst,1989). The ideal characters of a part are
listed below,
–Part is self aligning
–Part does not need to be oriented
–Part requires only one hand for assembly
–Part requires no tools
–Part is assembled in a single linear motion
–Part is secured immediately upon insertion
•Consider customer assembly technology driven
products.

12. OMF551 - Product Design and Development
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 3: Prototype basics

13. Reduce the costs of components
•Identify process constraints and cost drivers-
automatic laser cutting machine and a welding
process are the two best examples to explain this.

•Redesign components to eliminate processing steps
Main fold housing-(Materials)
•Variable cost
•(Mold tooling)Fixed cost
•(overhead charges)Total direct cost
•Total unit cost
2

14. •Choose the appropriate economic scale for the part
process
– Manufacturing costs drops as the volume of product increases called
ECONOMIES OF SCALE. Example: Injection molded plastic part.

•Standardize components and their processes-
•Internal standardization- Use of 3.8 liter V6 engine in several GM cars.
•External standardization- Use of 10mm socket head cap screw across
several auto manufactures.

•Adhere the black-box component- A component cost
reduction strategy used effectively in the Japanese auto
industry is called black box supplier design.
– Successful black box development requires “careful system- level
design and extremely clear definitions”.
3

15. Reduce the costs of assembly
•Design for assembly(DFA) is a fairly subset of DFM
that involves minimizing cost of assembly

•DFA index = (theoritical minimum number of parts)*(30 seconds)
/Estimated total assembly time

•Integrate parts (using the Boothroyd method)
–Integration of several features into a single component.
–The EGR return and vacuum, source parts are molded
into the redesigned intake manifold.
4

16. Reduce the costs of assembly
•Maximize ease of assembly(adapated from Boothroyd and
Dewhurst,1989).The ideal characters of a part are listed below,
–Part is self aligning
–Part does not need to be oriented
–Part requires only one hand for assembly
–Part requires no tools
–Part is assembled in a single linear motion
–Part is secured immediately upon insertion

•Consider customer assembly technology driven products. 5

17. 1
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 4: Principles of Prototyping
OMF551 - Product Design and Development

18. PrinciPles of PrototyPing
•Analytical Prototypes Are Generally More Flexible Than Physical
Prototypes
•Physical Prototypes Are Required to Detect Unanticipated
Phenomena
•A Prototype May Reduce the Risk of Costly Iterations
•A Prototype May Expedite Other Development Steps
•A Prototype May Restructure Task Dependencies

19. Prototyping technologies
3D CAD Modeling and Analysis:
The dominant mode of representing designs has shifted from drawings created by
computer to 3D CAD models.

•The advantage of 3D CAD include:
1.ability to easily visualize the three-dimensional
form of the design;
2.the ability to create photo-realistic images for assessment of
product appearance;
3.the ability to automatically compute physical properties
a)such as mass and volume
b)efficiency arising from the creation of one and only one canonical description of
the design, from which other, more focused descriptions, such as cross-sectional views
and fabrication drawings, can be created.

20. PrototyPing technologies
3D CAD Modeling and Analysis:
The dominant mode of representing designs has shifted from drawings created by
computer to 3D CAD models.

•Through the use of computer-aided engineering (CAE) tools, 3D CAD models
have begun to serve as analytical prototypes.
•Engineers also computed heat flows and thermal dissipation performance using finite-element
analysis based on 3D CAD models.

22. free form fabrication
•In 1984, the first commercial free-form fabrication system was introduced by
3DSystems.
•This technology, called stereolithography, and dozens of competing
technologies that followed it, create physical objects directly from 3D CAD
models, and can be thought of as “three-dimensional printing.” This
collection of technologies is often called rapid prototyping.

•Free-form fabrication technologies enable realistic 3D prototypes to be
created earlier and less expensively than was possible before.

•For example, the PackBot prototype was made of components fabricated
using stereolithography in only four days.

23. 1
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 5: : Planning for Prototyping
OMF551 - Product Design and Development

24. Planning for PrototyPing
2

25. Key Dates for PrototyPe
3

26. ProDuct PrototyPe
4

27. Planning Milestones PrototyPes
•The comprehensive prototypes a team uses as development
benefit from additional planning
•Planning the milestone dates is an integral part of establishing
an overall product development project plan
•As a base case, the team should consider using alpha, beta,
and preproduction prototypes as milestones.
•Additional early prototypes are common in situations where the
product embodies a new concept or technology. These early
prototypes are sometimes called experimental or engineering
prototypes.
5

28. a guide for students to Plan their Prototypes
•It is important that the students consider how to include
prototypes in the innovation process.
•Prototypes should be tested-preferably several times-
during the innovation process and afterwards revised.
•Besides this,the students should develop and test
several different prototypes that are able to “compete”
with eachother during the test period.
6

29. 1
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 6: : Economic Analysis
OMF551 - Product Design and Development

30. Economic Analysis Process
2
We recommend the following four-step method for the economic
analysis of a product-development project:

1. Build a base-case financial model.
2. Perform a sensitivity analysis to understand the relationships
between financial success and the key assumptions and variables
of the model.
3. Use the sensitivity analysis to understand project trade-offs.
4. Consider the influence of the qualitative factors on project
success.

31. Step 1: Build a Base-Case Financial
Model
3
The most basic categories of cash flow for a typical new
product development project are:

• Development cost (all remaining design, testing, and refinement
costs up to production ramp-up).
• Ramp-up cost.
• Marketing and support cost.
• Production cost.
• Sales revenues.

32. 4




Step 2: Build a Base-Case
Financial Model

33. 5
Step 3: Use Sensitivity Analysis to
Understand Project Trade-Offs
•Six Potential Interactions

34. 6
Step 4: Consider the Influence of the
Qualitative Factors on Project
Success
Projects Interact with the Firm, the Market, and the Macro Environment
•Interactions between the Project and the Firm as a Whole
•Interactions between the Project and the Market
•Interactions between the Project and the Macro Environment

35. 1
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 7: Understanding and Representing Tasks
OMF551 - Product Design and Development

36. 2
Three ways to represent the tasks in a project, i,.e.
fundamental characteristics of interacting tasks—the “basic
physics” of projects
i.Sequential
ii.Parallel
iii.Coupled Tasks


Three ways to represent the tasks in
a project

37. 3
1. Sequential

Three ways to represent the tasks in
a project

38. 4
2. Parallel


Three ways to represent the tasks in
a project

39. Three ways to represent the tasks in
a project
5
3. Coupled Tasks

40. 6
Design Structure Matrix (DSM)
•tool for representing and analyzing task dependencies is the
design structure matrix (DSM).

41. 7
GANTT CHART
•The traditional tool for representing the timing of tasks is the Gantt chart

42. 8
PERT CHART
The Critical Path :
•The dependencies among the tasks in a PERT chart,
•arranged sequentially OR in parallel,
•lead to the concept of a critical path.
•The critical path is the longest chain of dependent events

43. 1
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 8: Baseline Project Planning
OMF551 - Product Design and Development

44. 2
i.The project plan is the roadmap for the remaining
development effort.
ii.in coordinating the remaining tasks and
iii. in estimating the required development resources and
development time
iv. baseline project plan
v.The results of the concept development phase
plus the project plan make up the contract book.

Baseline Project Planning

45. 3
i.The Contract Book
•document represents an agreement between the
development team and the senior management of the
company
•about project goals, direction, and resource requirements.


Baseline Project Planning

46. 4
Baseline Project Planning

The Contract Book / Project Task List

47. 5
Baseline Project Planning

Team Staffing and Organization
1. There are 10 or fewer members of the team.
2. Members volunteer to serve on the team.
3. Members serve on the team from the time of concept
development until product launch.
4. Members are assigned to the team full-time.
5. Members report directly to the team leader.
6. The key functions, including at least marketing, design, and
manufacturing, are on the team.
7. Members are located within conversational distance of each other.

48. 6
Baseline Project Planning

Project Schedule
1.The project schedule is the merger of the project tasks and the project
time line.
2.The schedule identifies when major project milestones are expected to
occur and when each project task is expected to begin and end.

49. 7
Baseline Project Planning

Project Budget

50. 8
Baseline Project Planning
Project Risk Plan
Modifying the Baseline Plan

51. 1
Unit - V - DESIGN FOR MANUFACTURING AND
PRODUCT DEVELOPMENT

Topic 9: : Accelerating the Project and
Project Execution
OMF551 - Product Design and Development

52. Accelerating Projects
2

1.Start the project early
2.Manage the project scope
3.Facilitate the exchange of essential information
4.Complete individual tasks on the critical path more quickly
5.Aggregate safety times
6.Eliminate some critical path tasks entirely
7.Eliminate waiting delays for critical path resources
8.Overlap selected critical tasks

53. Accelerating Projects
3

9.Pipeline large tasks
10.Outsource some tasks
11.Perform more iterations quickly
12.Decouple tasks to avoid iterations
13.Consider sets of solutions

54. Project Execution
4
Coordination Mechanisms:
i.Informal communication
ii.Meetings
iii.Schedule display
iv. Weekly updates
v.Incentives
vi. Process documents

55. Assessing Project Status
whether as per schedule or not
5
i.Changing the timing or frequency of meetings
ii.Changing the project staff
iii.Locating the team together physically
iv. Soliciting more time and effort from the team
v.Focusing more effort on the critical tasks
vi. Engaging outside resources
vii.Changing the project scope or schedule
Corrective Actions