Preparing Models for CAE and MFG Applications

Transcription

1 Preparing Models for CAE and MFG Applications Closing the Gap Abdul Shammaa Elysium Inc. GPDIS_2013.ppt 1

2 The Gap CAD models are often not readily usable by downstream applications A mathematically valid model is essential but may not necessarily usable by downstream applications The needed fidelity of a CAD model depends on the downstream consumer Design details Model abstraction It is difficult for non-domain expert to fully prepare models for a downstream application GPDIS_2013.ppt 2

3 Finished Product GPDIS_2013.ppt 3

4 Mathematically Valid Model GPDIS_2013.ppt 4

5 Product Data Quality (PDQ) GPDIS_2013.ppt 5

6 Manufactured Subassembly GPDIS_2013.ppt 6

7 CAD Data Use Cases 1. Mechanical Engineer Import data from supplier Validate model definition Compare models 2. CAE Engineer Simplify model Abstract model 3. Manufacturing Engineer Prototype (SLA, 3D Printing) Design die Design mold Generate tool path Design packaging, etc GPDIS_2013.ppt 7

8 Simplification Remove tiny fillets Remove recess Remove small holes Remove boss/ribs Proprietary BOEING is a trademark8of Boeing Management Company GPDIS_2013.ppt 8

9 Midsurface Abstraction GPDIS_2013.ppt 9

10 Simplifiction+Midsurface Abstraction Solid Model with 73 Faces Surface Model with 24 Faces GPDIS_2013.ppt 10

11 Geometry Deformation Specify deformation considering spring back Following deformation instruction Specify deformation according to the result of CAE analysis Specify an area to deform GPDIS_2013.ppt 11

12 Envelop Feature of envelope function Create an envelope of individual part as a closed solid Create an envelope of an assembly as a single, closed part Interference and gap between parts are filled Use cases of envelope function Reduce file size for checking interference or Digital Mock Up Create simplified data for CAE Protect intellectual property Packaging GPDIS_2013.ppt 12

13 Envelop After Envelop Original Assembly Part Count 196 Part Count 39 Face Count 20,040 Face Count 7,021 File size 57.7 MB File size 17.4 MB GPDIS_2013.ppt 13

14 Manufacturing Predict problems related to model making Mold design Deep Trench Sharp Edge (Mold) Detect thin walled parts. (Affects mold (Affects mold durability) durability) Detect sharp edges. Small Bump Min Curvature R Convex Corner Detect the small bumps requiring costly level of detail in machining. Detect product faces Detect convex corners whose R is smaller lacking a draft angle than a cutting tool for cutting tool. radius. Product design Sharp Edge(Product) Detect sharp edges. (Affects product durability) Tilt Angle mold construction Wall Thickness Detect faces lacking Detect thin-walled a draft angle for parts that may affect product extraction. product durability. Undercut Detect undercut parts requiring the additional mold construction. Boss(Narrow Top Area) Detect bosses with narrow top area. (The error can be a problem in drafting a mold.) GPDIS_2013.ppt 14

15 Reverse Engineering Automatic generation of CAD data from point cloud or polygon data came from 3D scanner or CAE mesh model Fit the original CAD model to scanned polygon model or CAE Mesh GPDIS_2013.ppt 15

16 Questions? GPDIS_2013.ppt 16