Composite Baseball Bat Manufacturing Process


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Composite Baseball Bat Manufacturing Process

  1. 1. Composite Baseball BatsManufacturing Process & Comparison with Aluminum BatsSyed Mustijab Haider Rizvi (MM111117)
  2. 2. Composite Baseball Bats Table of Contents1. Introduction2. Shapes3. Aluminum and Composite Bats4. Properties of Baseball Bats5. Manufacturing Process6. Comparison7. Conclusions8. References
  3. 3. Composite Baseball Bats Introduction Baseball bats fall within three material classifications1. Wood 2. Aluminum 3.Composite
  4. 4. Composite Baseball Bats ShapesBaseball bats in the early days of baseball came in allshapes and sizes(long, short, flat, and heavy)• 1859 – Maximum diameter 2.5 inches• 1869 – Maximum length 42 inches• 1890 – No more flat bats only round with maximum diameter 2.87inches
  5. 5. Composite Baseball Bats Aluminum and Composite Bats1924 – A patent for the first metal baseball bat1970 – First metallic bat in the game1980 – First composite bat in the game Worth Aluminum baseball bat Easton Aluminum baseball bat
  6. 6. Composite Baseball Bats Properties of a baseball batImportant features Durability and strength Stiffness Swing weight Trampoline effect Vibrations
  7. 7. Composite Baseball Bats Manufacturing ProcessFollowing steps are involved in composite baseball bat manufacturingprocess 1. Starting material 6. Hot pressure molding 2. Steel bat frame 7. Extracting steel bat form 3. Winding of polypropylene layer 8. Inspection and flexibility testing 4. Baking 9. Black primer coating 5. Braided carbon and glass layers 10. Finishing operations
  8. 8. Composite Baseball Bats 1. Starting MaterialResin infused pliable carbon fiber sheets• Sheet layers• Hot rolling – melting of resin and diffusion of fibers Sheet layers Hot rolling
  9. 9. Composite Baseball Bats 2. Steel Bat FormThe fiber sheets are then spiral around the steel bat form at different anglesto make a fine bat form. Steel bat form Fiber sheet wrapping on steel bat form
  10. 10. Composite Baseball Bats 3. Winding of polypropylene A layer of polypropylene is winded to squeeze out any trapped air between the layers Fiber sheet wrapped bat formPolypropylene layer
  11. 11. Composite Baseball Bats 4. BakingBaking for two hours  Resin curing Placing bats in baking oven
  12. 12. Composite Baseball Bats 5. Braided carbon and glass layersAfter the removal of polypropylene, bat form is wrapped with three layers (3) • Braided carbon and glass (1) • A thick layer of carbon (2) • Aramid Fiber layer (3) (1) (2)
  13. 13. Composite Baseball Bats 6. Hot Pressure Molding The bats are placed in the mold and epoxy resin is injected with high pressure at high temperature Bats in mold Hole forepoxy resin injection
  14. 14. Composite Baseball Bats 7. Extracting the Steel Bat Form After the removal from the mold steel bat form is extracted Steel bat form HollowComposite bat
  15. 15. Composite Baseball Bats 8. Inspection and Flexibility TestingBat is inspected for any visible defects and tested on flexibility testing machine to ensure that bat has attained desired flexibility
  16. 16. Composite Baseball Bats 9. Black Primer CoatingAfter inspection black primer coating is applied and bats are hanged to dry
  17. 17. Composite Baseball Bats 10. Finishing Operations (4) • Spray Paint (1) • Brand • Adjust weight (2) • Adjust balance • In-cap (3) • Grip (4)(1) (2) (3)
  18. 18. Comparison Comparison of aluminum and composite baseball bats Composite Aluminum Swing weightLower swing weight and maximumeffect of swing weight by having both Relatively higher swing weighta lower moment of inertia as well as acenter of mass closer to the handle Trampoline effectThe softer barrel allows the ball to Due to isotropic properties it is difficultcome off with small losses in energy to make different parts with differentwhile maintaining the stiffness of the stiffness so stiffness of barrel must bebat in the handle high VibrationVery high damping rate causing no High vibrations cause a stingobservable vibrations
  19. 19. Comparison Composite Aluminum Temperature effectCannot be used at lower temperature Can be used at any temperature DurabilityRelatively low life time Can be used for long period of times Flexibility in propertiesProperties can be tailored at will Difficult to obtain anisotropic properties Performance with timePerformance improves with usage due Performance decreases with timeto loosing of fibers up till a certain limit Sweet spot (area of bat which transfer maximum power to ball)Larger sweet spot Relatively small sweet spot CostHigh cost Low cost
  20. 20. Composite Baseball Bats ConclusionComposite bats have outperformed aluminum bats by their superior and tailorable qualities;• The swing weight for these bats is more easily controllable,• Trampoline effect may be tuned,• Bending stiffness may be tuned and• Bending vibrations are more highly damped.These all properties together made them the first choice of any player
  21. 21. Thank You!
  22. 22. References[1] Mahesh M. Shenoy et al (2001). “Performance assessmentof wood, metal and composite baseball bats”, CompositeStructures 397-404[2] Matthew Broe et al (2010). “Experimental study of theevolution of composite baseball bat performance”, ProcediaEngineering 2 2653–2658[3] 18-05-2012 at 1:45 PM[4] 18-05-2012 at 2:00 PM[5] 18-05-2012 at 2:25 PM[6] 18-05-2012 at 4:00 PM[7] 18-05-2012 at 5:00 PM