powerpoint presentation€¦ · •3d assemblies – introduced with version 2016* *solidworks mbd...
TRANSCRIPT
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http://blogs.solidworks.com/solidworksblog/2015/10/mbd-implementation-10-dos-and-10-donts-dont-hesitate-part-1.html
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Assess PMI Consumption
Identify Data Needs
Create MBE Vision Plan
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• 3 DimXperts
• 2D Drawings – Introduced with version 2007
• 3D Parts – Introduced with version 2008
• 3D Assemblies – Introduced with version 2016*
*SOLIDWORKS MBD license required
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•Machined Parts • Milled • Drilled • Turned
•Geometric and Plus-Minus Tolerance
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• Sheetmetal • Bends not supported --- Use Reference Dimension
• Prismatic type features are supported (planes, holes, slots)
• Molded/Casted Parts • Draft not supported
• Profile tolerancing is supported
• Use reference geometry (planes and intersections)
• Special Geometries • Including gears, threads and cams
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Countersink Cone Hole Counterbore
Slot Notch Boss Cylinder
Pocket Surface Chamfer Fillet
Plane
Width
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Intersect Line Intersect Point Intersect Plane
Plane intersection between a cylinder
and a cone
Line intersection between a two
planes
Point intersection between a cylinder
and a plane
DimXpert_Models/SAR1.SLDPRTDimXpert_Models/SAR2.SLDPRT
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• Model faces colored based on status • Green = Fully Constrained
• Yellow = Under Constrained
• Red = Over Constrained
• Native Color = Not Recognized by DimXpert
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• Sketch Dimensions • Facilitate part creation, configurations, design tables
• Linked to construction geometry not present in finished part
• Aren’t always consistent with methods used for manufacturing
• Don’t always meet requirements necessary to support geometric tolerancing
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• DimXpert Dimensions • Communicate part’s functional requirements
for assembly, manufacturing and inspection
• Always associated with manufacturing features
• Always associated with a tolerance
• Dimensions (basic) associated with geometric tolerances originate from and are oriented to the datum reference frame
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Tolerance type and values created by Size Dimension and Auto Dimension Scheme
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Chain Baseline
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1. ADS (Automatic Dimensioning Scheme) and Geometric Tolerancing
2. ADS and Plus-Minus Tolerancing
3. ADS and Selected Features
4. ADS and the Wedge
5. ADS and Concentric Features
6. Feature Selector
7. Manual Tolerancing
8. More Feature Selector
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DimXpert_Models/DX Demo1.SLDPRT
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DimXpert_Models/DX Demo2.SLDPRT
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DimXpert_Models/DX Demo3.SLDPRT
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DimXpert_Models/DX Demo4.SLDPRT
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Plus and Minus
Geometric
DimXpert_Models/DX Demo5.SLDPRT
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DimXpert_Models/DX Demo6.SLDPRT
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Location Dimension Size Dimension
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DimXpert_Models/DX Demo7.SLDPRT
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DimXpert_Models/DX Demo8.SLDPRT
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Intersect Line Intersect Point Intersect Plane
Plane intersection between a cylinder
and a cone
Line intersection between a two
planes
Point intersection between a cylinder
and a plane
DimXpert_Models/SAR1.SLDPRTDimXpert_Models/SAR2.SLDPRT
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• Notes
• BOM
• Title Blocks
• DimXpert and Reference Dimension Support in 2D Drawings
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• Tolerance stack-up analysis is the study of dimension and tolerance schemes to determine potential form, fit, and function problems in parts and assemblies
• Included with SOLIDWORKS Professional and Premium
What the permissible gap (G) between Part1 and Part4 ?
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• Assumes dimensions vary within the entire range of their tolerance zones and that the accumulation of tolerances will experience all possible variations
Gmin = L1 + L2 + L3 + L4… + Ln = L1 + L2 + L3 + L4
= 152.75 + (-60.75) + (-42) + (-50.5)
= -0.5 Interference
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• Assumes dimensions vary randomly within a normal distribution (±3σ) centered about midpoint of the tolerance zone.
G = Gnominal ± √ T12 + T22 + T32… TN2
= 2 ± √ 0.252 + 0.752 + 12 + 0.52 = 2 ± 1.369
Gmin = 0.631, Gmax = 3.369
Gnominal = 153 - 60 - 41 - 50
= 2
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• It is incorrect to think max worst case is when the parts are at their largest and min worst case is when they are at their smallest
Part Nominal Assembly Worst-case
Maximum Worst-case
Minimum
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Functional Requirement: D >= 39
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Top Plate Angle Bracket Bushing
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Before After
To reduce the tolerance stack by 0.8
(39 – 38.2) the tolerance of each
dimension would have to be changed
to ± 0.1
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Before After
By increasing the width between the faces
locating the two angle brackets by 1 mm the
results for the minimum worst-case gap would
be 39.2 (38.2 + 1)
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By adding a dimension between the planes which locate
the axel supports and removing the 40 dimension on the
right side of the part the tolerance stack between the
planes is reduced from ± 1.1 to ± 0.3. As a result the new worst-case minimum dimension would be 39.
Before
After Before
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http://blogs.solidworks.com/solidworksblog/2015/10/mbd-implementation-10-dos-and-10-donts-dont-hesitate-part-1.html
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Assess PMI Consumption
Identify Data Needs
Create MBE Vision Plan