PTC自顶向下(Top-Down)设计教程

External Copy Geometry

Build relationships on external models independent of an assembly Useful for coordinate system assembly practices
Inheritance – Inherit model geometry for one-way associativity Shrinkwrap (included in Foundation Advantage Package)
Design Information
Component
Component
Component
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A more integrated approach….
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Top Down Design Stages – It is a concept.
6-Stage Process
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Why should you use it?
Benefits:
Reduced design time Reduced errors (right the first time) Increased quality Better project management visibility Concurrent engineering Confidence in top-level regeneration
Traditional Design Approach
“Bottom-Up Design”

Design of individual components independent of the assembly Manual approach to ensure that components fit properly and meet the design criteria Components and those placed in sub-assemblies are brought together to develop the top-level assembly Errors are manually identified and modifications to each component are made to make the adjustment. As assembly grows, detecting these inconsistencies and correcting them can consume a considerable amount of time Top Level Assembly
Tips & Techniques
Top-Down Design Tools
Managing Complex Assemblies
Victor Remmers Holland Engineering Consultants BV
Top-Down Design Philosophy
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6.
Population of the Assembly Phase
Automatic Component Constraints & Component Interfaces
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The Bobcat example
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Stage 1
Conceptual Engineering Phase Layouts and Engineering Notebook

Foundation for efficient task distribution Assembly Population Environments
• •
Pro/E menus and Model Tree pop-up menus Pro/INTRALINK and PDMLink

Component Creation Methods
Capturing Design Intent Phase Skeleton Models
What needs to happen?

Capture conceptual design parameters within the context of the assembly Capture & control critical object interfaces in a single, convenient location
Manage Interdependencies Phase Reference Viewer & Reference Graph
Tools to Manage References

External Reference Control
• Ensures
Top-Down Design methodology is followed
Special Treatment in BOMs, Simplified Reps, Drawings, Model Tree & Mass Property Calculations Uniquely supported Scope Control Setting

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Stage 4
1.
Conceptual Engineering Phase
Layouts and Engineering Notebook
2.
Preliminary Product Structure Phase
Pro/INTRALINK, Model Tree
3.
Capturing Design Intent Phase

How? Skeletonthway for communication Facilitate task distribution Promote well-organized design environments


Enable faster, more efficient propagation of change
Understand Existing Situation

High-level Requirements Space Allocation
Define New Space and Motion

2D Sketches 3D Models Rapid Iteration & Convergence Animations
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Stage 5
Communication of Design Intent Phase Publish Geoms, Copy Geoms & Inheritance
Publish Geometry Features

Provides ability to pre-determine the geometry to be referenced by a Copy Geometry feature Allows designers to define their interfaces to the rest of the design
Capture Key Design Intent

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Parameters Notes Spreadsheets Proprietary Data
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Stage 2
Preliminary Product Structure Phase Pro/INTRALINK, Model Tree

Copy Geometry Features

Allows copying of all types of geometry
Surfaces, edges, curves, datums, quilts, copy/publish geometry
Retains copied geometry name and layer settings Dependency on parent geometry can be toggled Can be “Externalized”
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Stage 6
Population of the Assembly Phase Automatic Component Constraints & Component Interfaces
What tools are available for populating the assembly?

Assembly Tools
• •
Drag & Drop Placement Component Interfaces

Component Creation
•
•
Within the context of the assembly
Mirror Parts or Subassemblies
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Skeleton Models
4.
Manage Interdependencies Phase
Reference Viewer & Reference Graph
5.
Communication of Design Intent Phase
Copy Geoms, Publish Geoms & Shrinkwrap
design management rules directly into the design proper design reuse