parametric modeling vs. direct modeling - metalforming ... · pdf fileo parametric,...

Parametric Modeling vs.

Direct Modeling

Paul Hamilton Creo Program Manager, PTC p-hamilton.blogspot.com www.youtube.com/user/phamilt twitter.com/phamil1

May 30, 2013

• Key design requirements for stamping-‐‑die design, and applying the various modeling technologies to those requirements

AGENDA

•  A short history of 3D CAD •  Modeling technologies; the fundamentals

o  Parametric, history-based modeling o  Direct, history-free modeling o  The hybrid approach(s)

•  Key design requirements in support of Stamping Die Design o  Data Import, clean up and editing o  Development of die components o  Analysis, simulation and optimization

•  Appling the technologies to the design requirements o  The strengths and challenges of parametric modeling for stamping die design o  The strengths and challenges of direct modeling for stamping die design

•  How to choose what is right for your design needs o  Aligning technology to process for maximum business value

Parametric vs. Direct Modeling

Paul Hamilton (May 2013)

Direct Modeling

Parametric Modeling

Solid Modeling The Technology behind Solid Modeling

I-‐‑DEAS CATIA V4

CSG + B-‐‑Rep Primitives

Anvil Graftek

UniGraphics

B-‐‑Rep + Local Ops

Creo Parametric NX

CATIA V5 SolidWorks Solid Edge Inventor IronCAD

CoCreate (Creo Elements/Direct)

SpaceClaim KeyCreator Fusion

NX (History-‐‑Free Mode) 3D Sync

B-‐‑Rep CSG

Pro/Engineer (Wildfire)

SolidDesigner (CoCreate)

History-‐‑Based History-‐‑Free Paul Hamilton (May 2013)

•  “Parametric” (history-based) o  Structured modeling process o  The history tree is the master o  Constrained sketching o  Inherent parent/child relationships o  Part/assembly modes o  Edits are typically indirect o  Linear parameters o  Direct edits are ordered in tree o  Design intent defined via modeling process

•  “Direct” (history-free) o  Flexible modeling process o  The geometry is the master o  Flexible sketching o  No parent/child relationship o  No part/assembly mode o  Edits are typically direct o  Synchronous parameters o  Direct and indirect edits just change geo o  Design intent defined as needed

Technology Differences Parametric Approach / Direct Approach

Direct Modeling Direct Editing Recognition Visualization

History-Free Modeling

Geometry

Sketcher Features Constraints Visualization

History-Based Modeling

Geometry

Sketches, Features, Parameters, Structure


•  History-Based Modeling o  Use the parent/child relationship to:

•  Enable design automation •  Create platforms and families

o  This is a powerful and rich approach •  Where the product strategy is family-based or

platform-driven

•  History-Free Modeling o  Quickly and easily create 3D designs o  Create and modify the model through direct

interaction o  Make radical changes at any time o  Edit geometry from any CAD source o  This is a lightweight/flexible approach

•  Where the value of front loading a design with engineering constraints and relationships does not carry forward

Key Value Opportunities Parametric Approach / Direct Approach


•  History-Based Modeling o  Use parameters and features to

•  Create and drive a precise definition •  Where geometry is not the master

o  This is a powerful and rich approach •  Ideal for companies whose products are highly

engineered

•  History-Free Modeling o  Quickly and easily create 3D designs

•  Create and modify the model directly with no attention to the modeling process

•  Make radical part and assembly changes synchronously and in context

o  This is a lightweight and flexible approach •  Ideal for companies working with complex/large

assemblies

Key Value Opportunities Parametric Approach / Direct Approach


© 2007 PTC 7 7

Direct Modeling Recognition

“Direct Modeling lets me create large assembly designs in two-‐‑thirds or even half the time that a parameter-‐‑

based system would require”.

Chris Baker, Director Mechanical Engineering

"ʺAs specifications increase, models may be subjected to substantial, unforeseen changes. Direct Modeling

offers the flexibility to stay on top”.

Stefan Reinbold, Technical Support Project Manager, Bystronic Laser AG

“We'ʹre in a competitive industry, in which being first to market brings significant marketing advantages. The 700 Series… got

there first. Direct Modeling helped us to be number one”. Ryan White, Intermec

“Direct Modeling can be learned quickly on the job while working on a project”.

Masakazu Naito, Development Team Chief Engineer Office Network Company, Panasonic Communications Co., Ltd


Parametric Approach / Direct Approach Data Exchange



Geometry



Geometry




Geometry



Geometry

IGES STEP


Growing number of attempts to merge these very different methods Trying to get the “Best of Both”

Parametric History-‐‑Based Approach

Direct History-‐‑Free Approach

Not Recording Just geometry

Recording The ordered, structured model

In-Direct Manipulation

Direct Manipulation

Geometry Editing

Parametric Control


Merging the Technologies – Adding Direct Editing to History-Based Modeling The “Best of Both”



Geometry


Direct Editing

DE Feature

Merging the Technologies – Adding Parametric Control to History-Free Geometry



Geometry

Para. Solver

Parameters


Growing number of attempts to merge these very different methods Trying to get the “Best of Both”

Parametric History-‐‑Based Approach

Direct History-‐‑Free Approach

Direct Editing

Parametric Control


Demonstration History-‐‑Based with Direct Editing

http://www.youtube.com/user/phamilt http://p-hamilton.blogspot.com/2012/07/history-based-modeling-and-direct.html


Demonstration History-‐‑Free with Parametric Control

http://www.youtube.com/user/phamilt http://p-hamilton.blogspot.com/2012/07/parametric-direct-modeling.html


14

Can History-Free Modeling add value to the process of Die Design?

Die Design


•  Pros (Benefits) o  Mature CAD products with many die design specific extensions o  Excellent for design optimization and automation o  Develop reconfigurable intelligent “platforms” and reuse o  Inherent feature to feature associativity (part > strip > die, …) o  Many designers with experience in one or more of these tools o  Growing direct editing capabilities for improved flexibility

•  Cons (Challenges) o  Long learning curve, can be very complex o  Data exchange at the “history” or feature level o  Must plan ahead and… o  Must follow good modeling practices o  Complex dies can be overwhelming to the system o  Large file size and potential slow performance

Pros & Cons History-‐‑Based Modeling


•  Pros (Benefits) o  Short learning curve, easy to learn o  What-You-See-Is-What-You-Get o  Many additional ways to create geometry o  Many additional ways to edit geometry o  Work with geometry from any source o  Independent from how geometry is created o  Can work with STEP and IGES data as native data o  Flexibility in capturing design intent o  70% to 90% smaller files

•  Cons (Challenges) o  Many immature representations of direct modeling on the market o  Few die design specific extensions o  Less optimized for design optimization and automation o  No parent/child relationship, i.e. no inherent feature to feature associativity

Pros & Cons History-‐‑Free Modeling


1.  One-off design, where front loading a design with robust design intent and structure does not yield long-term value

2.  Where speed is more critical than highly parameterized and structured models

3.  Where unpredictable late-stage changes happen often

4.  Where product lifecycles are short, i.e.; little payoff for the investment in the structured/ordered model

5.  Where many iterations are needed to make critical design decisions

6.  When you just need to get parts out the door as fast as possible

Key product characteristics to look for: Why Consider History-‐‑Free Modeling


Aligning Technology to Real Business Value Aligning technologies for real business value in die design

Business Objectives

Process Improvement Strategies & Initiatives

Foundation for Design Process Evolution, i.e.; Tools, Practices, Technologies

Define Enable

Guide Deliver

•  2D design • History-Based design • History-Free design • Mixed design

•  Improve data exchange/collaboration •  Improve speed in die development •  Improve ability to manipulate and modify •  Improve ability to optimize die performance

• Reduce overall cost of die • Reduce time to completion / cycle time •  Improve quality & lifecycle of die •  Improve ability to meet customer requirements


Parametric Modeling vs.

Direct Modeling

Paul Hamilton Creo Program Manager, PTC p-hamilton.blogspot.com www.youtube.com/user/phamilt twitter.com/phamil1

May 30, 2013

• Key design requirements for stamping-‐‑die design, and applying the various modeling technologies to those requirements

parametric modeling vs. direct modeling - metalforming ... · pdf fileo parametric,...

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