Parametric  Modeling    vs.    

Direct  Modeling

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

May 29, 2014

• 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  Live demonstrations of direct modeling

•  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 2014)

A  short  history  of  3D  CAD  

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)

KeyCreator SpaceClaim

Fusion NX  (History-­‐‑Free  Mode)

Creo  Direct 3D  Sync

B-­‐‑Rep CSG

Pro/Engineer (Wildfire)

SolidDesigner (CoCreate)

History-­‐‑Based History-­‐‑Free Paul Hamilton (May 2014)

Modeling  technologies;    the  fundamentals

•  “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

Paul Hamilton (May 2014)

•  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

Paul Hamilton (May 2014)

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

Paul Hamilton (May 2014)

Direct  Modeling  Recognition Recent Publications regarding Direct Modeling

Paul Hamilton (May 2014)

Key  design  requirements    in  support  of  

Stamping  Die  Design Live Demonstrations

Demonstration History-­‐‑Free  with  Parametric  Control

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

Paul Hamilton (May 2014)

How  to  choose  what  is  right  for  your  design  needs

13

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

Die  Design

Paul Hamilton (May 2014)

•  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

Paul Hamilton (May 2014)

•  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

Paul Hamilton (May 2014)

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

Paul Hamilton (May 2014)

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

Paul Hamilton (May 2014)

Parametric  Modeling    vs.    

Direct  Modeling

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

May 29, 2014

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