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Using Mechanical Fasteners to Assemble Plastic Parts

This article explores the use of mechanical fasteners in assembling plastic parts, covering types of fasteners, design considerations, and material property effects. It discusses permanent and non-permanent assemblies, insert types, and effects of fastener uses in different plastic materials.

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Using Mechanical Fasteners to Assemble Plastic Parts

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  1. Using Mechanical Fasteners to Assemble Plastic Parts Dane Taylor Ray McKee Jason Saggese

  2. Purpose • Explain Mechanical Fasteners in Plastics • Designing for Various of Fasteners • Effects of Using Fasteners

  3. Outline • Types of Fasteners • Inserts • Effects of Fastener Uses • Design Considerations • Material Property Effect

  4. Types • Permanent Assemblies • Pre-molded Insert • Rivets • Key Headed Screws

  5. Types • Non-Permanent Assemblies • Thread Cutting Screws • Thermosetting • High Modulus Materials • Thread Forming Screws • Semi-Crystalline • <200,000 psi Modulus

  6. Types • Non-Permanent Assemblies • Molded-in Threaded Inserts • Positioning • Nuts and Bolts

  7. Types • Specially Designed • Thread Pitch and Angle • Trilobe • 1,000,00 Modulus • Push-in • Double Lead

  8. Inserts • Molded-in Threaded • Expansion • Cap Nuts • Helically Coiled • Ultrasonic Insertion

  9. Effects of Fastener Uses • Machine Screws vs. Plastic Designed Screws • Automated Assembly Lines • Molding Technique

  10. Effects of Fastener Uses • Problems • Thread Stripping from Disassembly/Assembly • Poor Design • Extended Cycle Time

  11. Design Considerations • Bosses • Inner Diameter • Pitch Diameter of Screw • Outer Diameter • 2.5 X ID

  12. Design Considerations • Bosses • Length • Thread forming • Minimum – 2.5 X Pitch Diameter • Thread Cutting • At least – 3 X Diameter

  13. Design Considerations • Assembly • Deflection • Surface Area of Screw Head • Washers • Tapping • Ductile Materials • Cold Flow • Heat During Drilling

  14. Material Property Effects • Stiffness • Acceptance Without Cracking • Crystallinity • Deforms around Screws • Annealing • Reduces Creep • Greater Life Expectancy

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