Latest Issues in 3D CAD Data Translation And Quality

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Latest Issues in3D CAD Data Translation And
Quality

• 2007/07/04
• Atsuto Soma
• Elysium Co., Ltd.

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ELYSIUM Corporate Profile
ELYSIUM Co., Ltd.
Elysium Inc.
Elysium Europe
Location Hamamatsu Established1999/11/1 No.
Emp. 72 Activity Development,
sales
Location Detroit, LA Established
2000/4/1 No. Emp. 18 Activity
Development, sales
Location Paris Established2004/4/7 No.
Emp. 2 Activity Sales, Support
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Business Concept
Cellular Phone
CAD
CAM
CAE
PDM Viewer
DMU
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Global Partnership

• OEM

• OEM

• OEM

• OEM

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Customers
Over 2000 customers including
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Official supplier of Renault F1 Team!
As a supplier of data translaor. 2weeks -gt
3.5hours (CATIA -gt Patran)
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Current Problem of 3D CAD data
Information Infrastructure
becoming consolidated more and more
Much rework needed throughout whole process of
development process
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Issues of data translation and quality

• Data translation failure of 3D CAD data
• PDQ (PDQ-S)
• Translation of Parametric Feature with History
• Different data requirements for different usages
• Future Issues

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Translation failure classified by their causes

• Data translation failure of 3D CAD data

• Bug of CAD command
• Difference of system requirements
• Quality of CAD system command and/or users
  modeling skill

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A. Bug of CAD command

• Data translation failure of 3D CAD data

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B. Different requirements tolerance

• Data translation failure of 3D CAD data

• Happens when required accuracy of 3D data is
  different between a sending system and a
  receiving system.

More and more systems are using flexible
tolerance, i.e. allow local loose tolerance. -gt
Good and bad.
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B. Different requirements topology, geometric
model -

• Data translation failure of 3D CAD data

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C. Quality of command, modelig skill

• Data translation failure of 3D CAD data

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Demonstration

• Data translation failure of 3D CAD data

• CADdoctor
• PDQ checker and healer
• Problem
• B-rep base checking and healing
• VS. Solid modeler based on
• parametric feature with history

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2. Translation of parametric features with
history

• Direct feature translation is now becoming more
  and more practical.
• This capability can avoid PDQ issues on
• different tolerances
• different way/restriction of shape representation
• because translation system lets CAD system to
  calculate the explicit B-rep geometry.
• Demonstration (movie) of direct feature based
  translator
• Problems
• Mapping all of the CAD commands among all CAD
  systems needs much development resources and is
  impossible by a translation tool vendor.
• -gt Big expectation for SC4 standards. If neutral
  standards are established and if CAD systems
  support them, it will change the industry a lot.

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CAD systems ELYSIUM supports whose parametric
feature translation
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Backgrounds
3. Different data requirements for different
usages

• Definition of PDQ in SASIG guidelines
• Product data quality is a measure of the accuracy
  and appropriateness of product data combined with
  the timeliness with which those data are provided
  to all the people who need them.
• But, it is often the case where
• 3D CAD shape is not used as it is outside the
  originally designed CAD system.
• Need to optimize the CAD data for each usage.

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Examples of CAD data optimization
3. Different data requirements for different
usages

• CAE
• Ignore small features to make the model lighter
• Generate a mid-face model from a sheet
• Mold design
• Add tapers (with removing fillets in the original
  shape)
• Consideration of spring-back, overcrown, .
• CAM
• Remove holes, slots,
• CG
• Extract only outer shapes, culling internal parts
• And More

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Current status and the next step
3. Different data requirements for different
usages

• Shape modification without parametric feature
  information is now expanding in various systems
  (so called direct modeling)
• -gt Demonstration of CADdoctor
• No effective way to present those characteristics
  of CAD data
• -gt This may be a part of PDQ issue in future
  because its closely related to usefulness, and
  readiness of 3D data

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4. Future issues

• Quality checks by designers without much
  additional work.
• Tool vendors challenge and business chance
• e.g. Incremental quality check on CAD system
• Challenge to design quality
• Current activities are for data quality
• beautiful hand-writing and great literature ,
  perfect way of speaking and great speech
• are different.
• Data quality is for the former field.
• What IT can do for the latter purpose?

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Thank you very much for your attention!