Parametric Modeling vs. Direct Modeling Key design requirements for stamping- die design, and applying the various modeling technologies to those requirements Paul Hamilton Creo Program Manager, PTC p-hamilton.blogspot.com www.youtube.com/user/phamilt twitter.com/phamil1 May 30, 2013
AGENDA Parametric vs. Direct Modeling 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
Solid Modeling The Technology behind Solid Modeling I- DEAS CATIA V4 CSG B- Rep Anvil Graftek UniGraphics Pro/Engineer (Wildfire) CSG + B- Rep Primitives B- Rep + Local Ops SolidDesigner (CoCreate) Creo Parametric NX CATIA V5 SolidWorks Solid Edge Inventor IronCAD Parametric Modeling Direct Modeling CoCreate (Creo Elements/Direct) SpaceClaim KeyCreator Fusion NX (History- Free Mode) 3D Sync History- Based History- Free
Parametric Approach / Direct Approach Technology Differences 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 History-Based Modeling Sketcher Features Constraints Visualization History-Free Modeling Direct Modeling Direct Editing Recognition Visualization Sketches, Features, Parameters, Structure Geometry Geometry
Parametric Approach / Direct Approach Key Value Opportunities 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
Parametric Approach / Direct Approach Key Value Opportunities 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
Direct Modeling Recognition 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 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 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 7 2007 PTC
Parametric Approach / Direct Approach Data Exchange History-Based Modeling Sketcher Features Constraints Visualization History-Free Modeling Direct Modeling Direct Editing Recognition Visualization Sketches, Features, Parameters, Structure Geometry Geometry IGES STEP History-Based Modeling Sketcher Features Constraints Visualization History-Free Modeling Direct Modeling Direct Editing Recognition Visualization Geometry Geometry
Trying to get the Best of Both Growing number of attempts to merge these very different methods In-Direct Manipulation Direct Manipulation Parametric History- Based Approach Geometry Editing Recording The ordered, structured model Parametric Control Direct History- Free Approach Not Recording Just geometry
The Best of Both Merging the Technologies Adding Direct Editing to History-Based Modeling History-Based Modeling Sketcher Features Constraints Visualization Direct Editing Sketches, Features, Parameters, Structure Geometry DE Feature Merging the Technologies Adding Parametric Control to History-Free Geometry History-Free Modeling Direct Modeling Direct Editing Recognition Visualization Para. Solver Geometry Parameters
Trying to get the Best of Both Growing number of attempts to merge these very different methods Parametric History- Based Approach Direct Editing Parametric Control Direct History- Free Approach
History- Based with Direct Editing Demonstration http://www.youtube.com/user/phamilt http://p-hamilton.blogspot.com/2012/07/history-based-modeling-and-direct.html
History- Free with Parametric Control Demonstration http://www.youtube.com/user/phamilt http://p-hamilton.blogspot.com/2012/07/parametric-direct-modeling.html
Die Design Can History-Free Modeling add value to the process of Die Design? 14
Pros & Cons History- Based Modeling 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- Free 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
Why Consider History- Free Modeling Key product characteristics to look for: 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
Aligning Technology to Real Business Value Aligning technologies for real business value in die design Define Guide Reduce overall cost of die Reduce time to completion / cycle time Business Improve quality & lifecycle of die Objectives Improve ability to meet customer requirements Deliver Improve data exchange/collaboration Process Improvement Improve speed in die development Strategies & Initiatives Improve ability to manipulate and modify Improve ability to optimize die performance Enable Foundation for Design Process Evolution, i.e.; Tools, Practices, Technologies 2D design History-Based design History-Free design Mixed design
Parametric Modeling vs. Direct Modeling Key design requirements for stamping- die design, and applying the various modeling technologies to those requirements Paul Hamilton Creo Program Manager, PTC p-hamilton.blogspot.com www.youtube.com/user/phamilt twitter.com/phamil1 May 30, 2013