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Mechanical Fasteners

Mechanical Fasteners. BY DAVID HAFFEY IAN KARLE JACOB KENT. OBJECTIVE. EXPLAIN THE USE OF: RIVETS NUTS & BOLTS EXPLAIN COMBINATION OF FASTENERS METAL AND PLASTIC. OUTLINE. INTRODUCTION OF FASTENERS TYPES OF FASTENERS RIVETS METAL & PLASTIC FASTENERS

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Mechanical Fasteners

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  1. Mechanical Fasteners BY DAVID HAFFEY IAN KARLE JACOB KENT

  2. OBJECTIVE • EXPLAIN THE USE OF: • RIVETS • NUTS & BOLTS • EXPLAIN COMBINATION OF FASTENERS • METAL AND PLASTIC

  3. OUTLINE • INTRODUCTION OF FASTENERS • TYPES OF FASTENERS • RIVETS • METAL & PLASTIC FASTENERS • RECYCLING & DESIGN CONSIDERATIONS • CONCLUSION

  4. INTRODUCTION • PURPOSE OF RIVETS & SCREWS • PURPOSE OF GENERAL MECHANICAL FASTENERS

  5. TYPES OF FASTENERS • RIVETS • SCREWS, BOLTS AND NUTS • PLASTIC AND METAL • ADHESIVES • GLUE • TAPES • WELDING

  6. APPLICATIONS OF RIVETS • INDUSTRAL • BUILDING CONSTRICTION • PRODUCTION • TOYS

  7. TYPES OF RIVETS • SOLID • TUBULAR • FULL, SEMI, SELF PIERCING, COMPRESSION • SNAP, PUSH & BARB

  8. ADVANTAGES OF RIVETS • COST • CHEAPER THAN MOST THREADED FASTENERS • LITTLE TRAINING REQUIRED FOR USE • JOIN DISSIMILAR MATERIALS • ASTHETICALLY PLEASING • VARIETY OF SHAPES

  9. DISADVANTAGES OF RIVETS • LOWER STRENGTH THAN BOLTS & SCREWS • TENSILE • FATIGUE • NOT WATER OR AIR TIGHT • DIFFICULT TO DISASSEMBLE • LOOSENS UNDER HIGH LOADS

  10. TYPES OF METAL FASTENERS • SCREWS • OVAL, ROUND HEAD, SHEET METAL, LAG BOLTS • BOLTS & NUTS • MACHINE, CARRIAGE, STOVE • NAILS • COMMON, WIRE, DRYWALL, FINISH

  11. ADVANTAGES OF METAL FASTENERS • HIGHER STRENGTH • THAN RIVETS OR GLUE • LOW COST • EASE OF DISASSEMBLY

  12. DISADVANTAGES OF METAL FASTENERS • HIGHER WEIGHT THAN RIVETS OR PLASTIC • MOST ARE NOT CORROSION RESISTANT • VULNERABLE TO CYCLIC LOADINGS • DIFFICULT ASSEMBLY IN TIGHT PLACES • HOLES CAN WEAKEN PART

  13. TYPES OF PLASTIC FASTENERS • SCREWS • NUTS & BOLTS • CABLE TIES • PANEL FASTENERS

  14. APPLICATIONS OF PLASTIC FASTENERS • AUTOMOTIVE • WIRE HARNESS RETAINERS • PANEL & MOLDING CLIPS • GAS & BRAKE LINE CLIPS • TOYS • APPLIANCES • COMMERICAL

  15. MATERIAL TYPES AND PRODUCTION • NYLON • ACRYLIC • HDPE • PC • PP • INJECTION MOLDED

  16. ADVANTAGES • LOW COST • LIGHT WEIGHT • CHEMICAL RESISTANT • LOW THERMAL & ELECTRICAL CONDUCTIVITY • DESIGN FLEXIBILITY

  17. DISADVANTAGES • POOR UV RESISTANCE • STRESS RELAXATION • CREEP • DYNAMIC LOADING FAILURES • MORE INTRICATE MOLD DESIGNS • LOWER MECHANICAL PROPERTIES THAN METAL

  18. COMBINATIONS OF METAL AND PLASTIC FASTENERS • METAL INSERTS IN INJECTION MOLDING • THUMB SCREWS • STUDS WITH PLASTIC ATTACHMENTS (AUTOMOTIVE)

  19. REASONS FOR COMBINATIONS • ASTHETICALLY PLEASING • COMBINATION OF PROPERTIES

  20. RECYCLING CONSIDERATIONS • METAL AND PLASTIC MUST BE SEPERATED • MATERIAL SEPERATION OF PLASTICS • PROPERTIES DEGRADE MUILPILE USE

  21. DESIGN CONSIDERATIONS • HOLD STRENGTH • RECYCLING ABILITIES • PRODUCT LIFE • APPLICATION • MOLD INSERTS • PROPER DIAMETERS AND WALL THICKNESS • TORQUE AND TENSILE STRENGH

  22. CONCLUSION • APPLICAIONS • TYPES • OTHER CONSIDERATIONS

  23. QUESTIONS

  24. FIN

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