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Plastic Part Design Using SolidWorks 2010
Julie Napolitan, Product Definition SpecialistDassault Systemes SolidWorks Corporation
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Agendag
Plastic Part Design Using SolidWorks• Master Model Technique• Draft
Sh ll• Shell• Ribs• Fastening FeaturesFastening Features
– Vents– Lips and groovesp g– Mounting bosses– Snaps
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Task: Design a plastic enclosure for existing electronics
• Existing PCBA with 2 external connectors DC power DC power Ethernet
• Fan and heatsink sized for cooling requirements
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Models acquired from 3D Content Centralhtt // 3d t t t lhttp://www.3dcontentcentral.com
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Initial Design Sketches
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Master Modeling Techniques
• Base part• Split part• Multibody
For more information on master models please see the SolidWorks tutorial Molded Product Design AdvancedSolidWorks tutorial Molded Product Design - Advanced
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Master model techniqueB t th dBase part method
WhyParts fit together and use common references. Changing the master model will
update all models that reference the master.pHow• Create a master model that contains all common references.• Use Insert Part as the first feature in all parts that reference the master model. p
Cut With Surface to remove the material that belongs to other parts.
S li iSplitting surface
Splitting surface
Master shape
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Master model techniqueB t th dBase part method
Adjust split locations in main assembly
Assembly with separate parts
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Draft
• Use neutral plane draft to draft from one surface• Use parting line draft to draft from a more complex edge• Evaluate draft with the draft analysis tool—this can be left on while you are
making changes to the geometry.
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Shell
ShellingYou can place your Shell feature after a Draft feature to quickly get draft on the
inside and outside of a partUse multiple bodies to better control your shell feature if you have areas you
d ’t t h ll d tdon’t want shelled out
Separate bodies recombined after Shell feature
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RibsGeneral rules:
Rib thickness should be around 2/3 of the nominal thickness of the partWhy? To prevent sink marks
If a rib is too thick there will be a lot ofIf a rib is too thick there will be a lot of material at the wall intersection. When the plastic cools this area will contract more than the surrounding
Try to keep the height of the rib less than 3 times nominal wall thickness. Use more ribs to add stiffness
plastic causing unsightly “sink” marks
Use more ribs to add stiffness.
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Vents
• Create a sketch to define vent boundary and crossmembers• Select face to add vent• Select sketch elements to use as ribs and spars• SolidWorks will automatically calculate the flow area
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Lips and Grooves
• Works on separate parts or multiple bodies• Automatic show/hide of parts makes selection easy• Lip and Groove update to fit each other if the Lip is changed on one part the• Lip and Groove update to fit each other; if the Lip is changed on one part the
Groove on the matching part automatically changes as well.
Lip (orange part)
Groove (red part)
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Mounting Bossesg
• Automatically define the height of a boss or pin by selecting the mating face.• Automatically define the location of a boss or pin by selecting a cylindrical face.• Add fins to the boss for support if desired.
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Snaps and Snap Groovesp p
• Automatically define the height of a Snap by selecting the mating face.• Once a Snap has been created define a Groove feature based on the Snap
geometry. These pieces will update together.
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(Mostly) Finished( y)
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Product Definition Customer Visits
Product Definition Specialists visit customers all through the yearWe travel all over to visit customers so don’t be afraid to ask. No
customer is too small, we are interested in your feedback. Even if you’re in Minnesota and it’s the middle of winter.
Customer Visits: These visits last from 1 3 hours We like tours ofCustomer Visits: These visits last from 1‐3 hours. We like tours of your facilities if possible and would like to understand what you do day to day and how you use SolidWorks.
Consulting Visits: These visits are more in depth and last 2‐5 daysConsulting Visits: These visits are more in depth and last 2 5 days depending on your availability. We’ll do your work for free if you’d like. We just want to learn your process and actually doing your work is the best way to learn.
If interested please leave a business card with Customer Visit written on the back.