Design for manufacturing Flashcards
Describe “Over the wall design”
Departments dont work together resulting in a design that is hard or can not be manufactured. Important information is not transferred between departments. often occur in sequential pd
What are the general principles to DFX-methods
- Detail design decisions can have substantial impact on product quality and cost
- Development team face multiple, and often conflicting goals
- Important to have metrics to compare alternative designs
- A well defined method assists the decision-making process
- Dramatic improvements often require substantial creative efforts early in the process
Why is cross-functional teams needed in DFM?
You have many skecthes and design alternatives combined with estimates of manufacturing costs, production volumes. Lastly there is also a detailed understanding of assembly and manufacturing processes. Different competences is needed!
Describe the five DFM process steps by Ulrich and Eppinger
- Estimate manufacturing cost
- Reduce cost of components
- Reduce cost of assembly
- Reduce cost of supporting production
- Consider the impact of DFM decisions on other factors
Explain “estimate the manufacturing costs”
Getting an overview of the different costs in components, assembly and overhead.
Explain step 2: reduce cost of components
You need to understand the process constraints and cost drivers. Redesign components to eliminate processing steps. Choose the approprate economic scale for the part process
Standardize componentents and processes
What is included in step 3 “reduce the costs of assembly”?
Keeping score of the assembly efficiency
Integrate parts
Maximize ease of assembly
Consider customer assembly such as IKEA
Explain step 4 “Reduce costs of supporting production”
Its about two things:
- Minimize systemic complexity
- Error proofing
Explain step 5: Consider the impact of DFM decisions on other factors
The impact of DM on:
- Development time
- development cost
- product quality
- external factors
What are the seven levels of manufacturability according to Eureka?
- Manu. costs
- Quality
- Flexibility
- Risks
- Lead time
- Efficiency
- Environmental effects
Name the four DFM levels according to Eureka
- Corporate level (the interaction between company products)
- Family level (relationship within product family)
- Structural level (relationship between components)
- Component level (design of components)
Name the benefits of modularization
- shorter lead times
- Improved quality
- Continuous product improvements
- Shorter development time
What drawbacks are there in modularization?
Increased transport costs and extra work in assembly
