me 317 design for manufacturing
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ME 317 Design for Manufacturing. What Constitutes a “Good” Design?. SMIU Rules for Good Design. Good Design Should –. SMIU Rules for Excellent Design. Excellent Design Should -. Why Design for Manufacturing?. - PowerPoint PPT PresentationTRANSCRIPT
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ME 317
Design for Manufacturing
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What Constitutes a “Good” Design?
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SMIU Rules for Good Design
Good Design Should –
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SMIU Rules for Excellent Design
Excellent Design Should -
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Why Design for Manufacturing?
• Mechanical engineering designs generally include off-the-shelf components and fabricated parts.
• Knowing the strengths and limitations of the fabrication techniques makes for higher quality and more cost competitive designs.
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Ten General Design Principles(Chapter 1.3)
1. Simplicity2. Standard Materials and Components3. Standardized Design of the Product4. Liberal Tolerances5. Use Materials that are Easy to Process
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Ten General Design Principles(Chapter 1.3)
6. Teamwork with Manufacturing Personnel7. Avoidance of Secondary Operations8. Design to Expected Level of Production9. Utilize Special Process Characteristics10. Avoid Process Restrictiveness
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Simplicity
• Description: minimize the number of parts, intricate shapes, and manufacturing operations
• Motivation: generally provides reduced cost, improved reliability, easier servicing, and improved robustness
• Example: Braun Lift
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Part Count Reduction
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Standard Materials and Components• Description: Use standard off-the-shelf parts
and widely available materials• Motivation: eases purchasing, simplifies
inventory management, and avoids tooling investments
• Example: Screws
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Standardized Design of the Product
• Description: For similar products, specify the same materials, parts, and subassemblies as much as possible.
• Motivation: provides economies of scale, simplifies operations, and simplifies inventory management
• Example: Braun Lift
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Liberal Tolerances
• Description: make tolerances as forgiving as possible
• Motivation: tight tolerances are expensive (in a non-linear fashion)
• Example: Figure 1.3.1
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Use Easily Processed Materials
• Description: take advantage of materials that have been developed for easy processibility
• Motivation: while material may cost more, it will often provide lower overall cost
• Example: “Free-Machining” Grades, Many polymer grades are tuned to a process
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Teamwork with Manufacturing Personnel
• Description: collaborate with the people who will be producing your product (the earlier the better)
• Motivation: they provide a unique body of knowledge and useful insights
• Example:
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Avoidance of Secondary Operations
• Description: minimize the need for secondary operations
• Motivation: secondary operations (e.g. deburring, inspection, painting, and heat treating) can be as expensive as the primary manufacturing operation
• Example: Pre-painted steel, investment casting, MIM in firearms
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Design to Expected Level of Production
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Understand and Utilize Manufacturing Process Characteristics
• Description: understand and take advantage of the special capabilities of various manufacturing processes
• Motivation: can often eliminate manufacturing operations and reduce the number of parts
• Example: injection molding snap fits and living hinges
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Avoid Process Restrictiveness
• Description: on part drawings, specify only the final characteristics needed; do not specify the process to be used
• Motivation: potential cost savings