MODELING FOR THE END GAME > USABLE PARTS
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1 MODELING FOR THE END GAME > USABLE PARTS Mark Nielsen TechAzul liveworx.com # L I V E W O R X
2 MARK NIELSEN Founder TechAzul BS & MS Mechanical Engineering, University of California, Berkeley 25 years with PTC rasna: Application Engineer for Structural Analysis PTC: Application Engineer for all CAD/CAM applications PTC: Liaison with R&D for field engineering PTC: Subject Matter Expert: Model Based Definition (MBD) since 2002 Assisted over 60 companies with MBD in a variety of industries Aerospace Medical Industrial Commercial Standards & Industry Committee Participation ASME American society of Mechanical Engineers DMSC Dimensional Metrology Standards Consortium NIST National Institute of Standards and Technology # L I V E W O R X 3
3 DRAWINGS TO MBD EVOLUTION: First recognized technical drawing Orthographic Projection Protocol Drafting Machine 2D CAD SKETCHPAD 3D CAD UNISURF 2130 BC # L I V E W O R X 4
4 MODEL BASED ENTERPRISE AN EVOLUTION Common terminology for logical progression from fully drawing-based to a fully model-based enterprise Drawing Centric 2D Master Drawing 3D model not verified or configuration controlled Model Centric 2D Master Drawing w/ associative 3D model (Model is verified and configuration controlled) Model Based Definition 3D Master CAD Model with 3D annotations 2D drawings by exception Model Based Enterprise 3D Master CAD Model with 3D annotations Fully leveraged by the Enterprise # L I V E W O R X 5
5 WHY DO WE DESIGN? # L I V E W O R X 6
6 GETTING TO THE END GAME: USEABLE PARTS Design Manufacture Inspect # L I V E W O R X 7
7 USE THE PARTS Install Operate # L I V E W O R X 8
8 THE PROCESS TO GET TO USEABLE PARTS IS COMPLEX Design Manufacture Inspect Drawing Centric Manual Machining Manual Gauging Model Centric Model Based Definition CNC: Computer Numerical Control Feature based machining Model Based Toolpath Strategies Enterprise 4. CMM: Coordinate Measurement Machines Non-contact Scanners # L I V E W O R X 9
9 FOCUS HAS BEEN DERIVATIVE MODELS Design Manufacture Inspect CreoP STEP Parasolid STEP ACIS QIF FAI.xls For QIF is a key enabler # L I V E W O R X 10
10 THE PROCESS TO GET TO USEABLE PARTS IS COMPLEX Inspect Manual Gauging CMM: Coordinate Measurement Machines Non-contact Scanners Issues with current Computer Aided Process Import geometry only Must re-enter ALL the PMI into inspection software Datums Geometric Characteristics manually associated to surfaces Dimensions manually associated to surface extents Resolve GD&T conflicts & inaccuracies Section views are not beneficial other than visualization Measurement plan is often very ad-hoc Machine and Personnel dependent # L I V E W O R X 11
11 NEED TO UNDERSTAND INSPECTION PROCESS CAPABILITIES Understand the implications of the tolerances defined on the model Assess dimensions with the inspection capabilities of in-house & supplier machines Understand and associate the costs to the tolerance values. Measurement uncertainty Based on the dimension Density of sampling points Quality of CMM (accuracy, repeatability) Probe type Environmental conditions (temperature) # L I V E W O R X 12
12 QIF APPLICATION AREAS # L I V E W O R X 13
13 QIF APPLICATION AREAS Statistics: Reference a bundle of QIF Results sets and specify a statistical analysis method to be carried out. Can optionally include the results of the statistical analysis as well MBD is the base for providing traceability to authority CAD data. It is not required for basic QIF use cases. Considered to be the strongest semantic CAD+PMI standard available Results: Measurement results data, associated with the MBD! This can be just tolerance evaluation results, and can even include all the point cloud data from the features Plans Wide range of optional levels of detail for measurement plans: Bill of characteristics Assign measurement resources Specify sampling point locations DMIS is not part of QIF, but it has been updated to harmonize with the data traceability mechanisms in QIF Rules: Create measurement templates e.g.: If a Surface Profile tolerance value is less than x, use at least y number of points/sq. in. for CMM measurement Resources: Specify basic or highly detailed information about available measurement equipment (e.g., CMMs, probes, calipers, gages, etc.). As always, this data is contextual and semantic # L I V E W O R X 14
14 1. PMI 2. QPIDs 3. Key Chars 4. Criticalities 5. Criticality Area QIF file 1. MBD 2. BoC 3. CMM 4. Meas Plan 5. Rules 6. Results 7. Analytics CMM A CMM B scanner QIF file 1. MBD 2. BoC 3. CMM 4. Meas Plan 5. Results CMM C Creo Parametric PTC MBDVidia Capvidia Pundit CMM Metrosage CheckMate Origin Intl QIF file 1. MBD QPIDs QIF file 1. MBD 2. BoC QIF file 1. MBD 2. BoC 3. CMM 4. Meas Plan DMIS file 1. Probes 2. Locations CMM driver software control Probe Data Pt collections # L I V E W O R X 15
15 CAD MBD PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk # L I V E W O R X 16
16 INSPECTION READY MBD MODEL IN CREO PARAMETRIC CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk MBD Ready Check Annotations properly associated to surfaces No duplicate dimensions Patterned features associated # L I V E W O R X 17
17 ENGINEERING SHORTHAND MUST BE ELABORATED Engineering shorthand is not machine readable Unless otherwise specified 4X TYP Break all edges Check for improper associations Dimensions to edges Dimension of silhouette edges Dimensions to tangents Rounds and fillets Associated to edge sets Dimensions No duplicate dimensions No Over-write dimensions # L I V E W O R X 18
18 EXPORT QIF MODEL FROM CREO PARAMETRIC CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk QIF Export All Creo MBD Features & PMI Combined States Ontology of Tolerance Features # L I V E W O R X 19
19 TOLERANCE FEATURES & CHARACTERISTICS Characteristics Tolerance Features Position Characteristic Width Characteristic Parallel Planes Feature Diameter Characteristic Cylinder Feature Perpendicularity Characteristic Datum A Plane Feature Flatness Characteristic Fundamental constructs of QIF: Tolerance Features & Characteristics CAD geometry is wrapped by Features Different from CAD features Sometimes referred to as: Tolerance Features Metrology Features Measurement Features Features referenced by Characteristics Usually, these are GD&T Eg position or perpendicularity # L I V E W O R X 20
20 BILL OF CHARACTERISTICS FOR FIRST ARTICLE INSPECTION CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk Bill of Characteristics All Features Ballooned Dimensions Notes Symbols Machine Readable Semantic Representation # L I V E W O R X 21
21 SELECT CMM & DETERMINE THE OPTIMAL SAMPLING POINT LOCATIONS CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk # L I V E W O R X 22
22 MEASUREMENT UNCERTAINTY CONTROLS THE MEASUREMENT PROCESS 0 Common practice to review uncertainty ratio 10:1 ratio bandwidth (good) 4:1 ratio (uses 25% of band) Tolerance Zone 60% 10% 25% # L I V E W O R X 23
23 ISO PERFORMANCE TESTS FOR CMMS # L I V E W O R X 24
24 SIMULATION CALCULATES MEASUREMENT UNCERTAINTIES Understand & Control Risk Based on specific machine capabilities Monte Carlo Simulation Estimate of error uncertainty # L I V E W O R X 25
25 AUTOMATICALLY GENERATE INSPECTION TOOLPATH FOR CMM CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk # L I V E W O R X 26
26 RESULTING POINT CLOUD ANALYZED FOR RESULTS CALCULATION CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk # L I V E W O R X 27
27 CREO PARAMETRIC SESSION LINKED WITH QIF RESULTS CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk # L I V E W O R X 28
28 VIDEO: AUTOMATIC OPTIMIZED CMM INSPECTION # L I V E W O R X 29
29 GET TO USEABLE PARTS FASTER WITH INSPECTION AUTOMATION Automation & Optimization CAD MBD & PMI Bill of Characteristics Measurement Plan Optimized Execution Results Analytics Cpk Ppk Data Traceability # L I V E W O R X 30
30 FAST FORWARD TO USEABLE PARTS # L I V E W O R X 31
31 COMMENTS, THOUGHTS? # L I V E W O R X 32
32 WE WANT YOUR FEEDBACK Survey Please remember to complete your evaluation by selecting the session in your mobile app. # L I V E W O R X 33
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