Ch.18 Direct Digital Manufacturing, Ch.19 Design for AM Flashcards
List 8 factors that enable direct digital manufacturing
1.Unique and complex shapes
2.Part consolidation
3.Lot size of one
4.Fast turnaround
5.Digital manufacturing
6.Digital record
7.Electronic “spare parts”
8.No hard tooling
Contrast the difference between rapid prototyping and direct digital manufacturing based
on key certification characteristics:
equipment
personnel
practices
quality
equipment:
RP - from equipment manufacturer
DDM - production machines and calibration equipment
personnel:
RP - no formal testing, certification
DDM - ongoing need for certification
practices:
RP - trial and error
DDM - formal testing of each critical step
Quality:
RP - basic procedures
DDM - ISO9000 compliance, extensive thorough quality system needed
Contrast the difference between rapid prototyping and direct digital manufacturing based
on manufacturing characteristics:
system
planning
scheduling/delivery
personnel
vertical integration
System:
RP - basic
DDM - developed system, documentation required
Planning:
RP - basic
DDM - formal planning
Scheduling/delivery:
RP - informal
DDM - sophisticated scheduling
personnel:
RP - informal training
DDM - formal
vertical integration
RP - helpful
DDM - one-stop shop for customers
what are the 4 AM unique design capabilities?
Shape complexity: no virtual limits to the geometric complexity
Material complexity: flexibility in using single, different, or combinations of material for one point or one layer simultaneously
Functional complexity: allows two capabilities: a) create kinematic mechanisms like moving parts in one build, b) integrating components by pausing print during the duration of build (in-situ assembly)
Hierarchal Complexity: ability to create features on different size scales with varying degrees of shape complexity
Why is optimization a more challenging issue with DFAM than for DFM?
geometric complexity- need to support models with lots of features
physically meaningful and representable material properties
