snap-fit joints in plastics.pptsunny-plastic.com/upload/201703/17/201703171402454555.pdf · •...
TRANSCRIPT
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Snap-Fit Joints
in Plastics
Lanxess HK
Semi-Crystalline Product
Asia Pacific
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• Introduction to Snap-Fit Joints in Plastics
• Snap-Fit Joint Types
• Design Factors for Snap-Fit Joint
• FEM Demonstration
Content
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Introduction to Snap-Fit Joints
in Plastics
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• Bonding
• Welding
• Mechanical Joining
Plastic Joining Techniques
• Rivets
• Screws
• Inserts
• Molded Threads
• Press Fits
• Snap Fits
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• Simple
• Economical
• Rapid
• Separable / Inseparable
Snap-Fit Joint Benefits
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More demanding
tolerances
Constant strength
Requires undercut
Relaxation /
Creep-failure
Snap Fit
vs.
Press Fit
Pullout
Force
Insertion
Force> @
Pullout
ForceInsertion
Force
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No Additional
Parts Needed
Requires Fastener
Components
Vibration Resistant
Less Energy
Required
May Loosen
Under Vibration
Requires Tightening
Operation
Snap Fit
vs.
Screws
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Hermetic Seal
Difficult
Hermetic Seal
Easy
Dissimilar Materials
Integrally Molded
Compatible Materials
Special Welding
Equipment
Snap Fit
vs.
Welding
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Snap-Fit Joint Type
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• Cantilever
• Annular
• Torsional
Snap-Fit Joint Types
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Cantilever Snap Joint
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Annular Snap Joint
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Annular Snap Joint (cont.)
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Torsional Snap Joint
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U-Shaped Snap Joint
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Discontinuous Annular Snap Joint
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Snap Member
Hollow Cylinder Snap Joint
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Before During After
BumpsSnap Member
Bumps
Distortion Snap Joint
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Plan View Section View
Cantilever Variation Snap Joint
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Snap In
Snap On
Snap Assembly Methods
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Snap In
No Undercut Method
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Typical Applications
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