Propeller making process finnscrew


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Propeller making process finnscrew

  1. 1. Advance Ship Resistance & Propulsion – LNB 21103 FINNSCREW SDN.BHD - Propeller Making - PRESENTER: MOHD SYAHMI NURUDDIN 56267108111 ROZAIDI CHE RAZIB 56267108112
  2. 2. INTRODUCTION • Finnscrew Sdn.Bhd is a company that produce propeller for boat and ship used. • Head office base at Finland. • One of their factory for propeller making was located at Ipoh,Perak. • They produce all type of propeller with different size and materials.
  4. 4. PROCESS FLOW • 9 step which are: – Pattern making – Molding – Casting – Fatling – Machining – Grinding – Balancing – Surface finishing – Packaging and shipping
  5. 5. PATTERN MAKING • Pattern making is a process where from the design, the make a propeller blade template. • The blade section is made from fiber glass and Putty.
  6. 6. MOLDING • Molding is a process to make a mould to get propeller shape. • It have 2 section which are upper section and lower section. • The mould was made from fine sand and hardener agent.
  7. 7. CASTING • Casting is a process where a melting of propeller material such as Manganese Bronze will be put into mould to form a shape of propeller.
  8. 8. FATLING • Fatling is a process where the product of propeller will be removing from the mould.
  9. 9. MACHINING • Process to remove the abundant part and drill the boss to make a hole on Hub/Boss.
  10. 10. GRINDING • To ensure that the blade angle is correct and follow the design. • They use a template to check the angle.
  11. 11. BALANCING • At finnscrew sdn.bhd, they use static balancing method. • The propeller will attach to a steel rod. Then,it will put on a roller table. • If there have unbalance weight of blade, the more weight part will goes down. • Worker will grind that part to reduce the weight to get balance with other blade
  12. 12. SURFACE FINISHING • After balancing process had done, the propeller will going into grinding section again for surface finishing. • They use sand paper grinding disc to smooth the surface.
  13. 13. PACKAGING & SHIPPING • After surface finishing, the propeller is ready for packaging. They put it into wood box and cover it with plastic. • Then, it is ready for export to Europe by shipping.
  15. 15. QUALITY ASSURANCE • Quality is important thing for each propeller to ensure that the propeller is following the rule of IMO. The material must be following the standard of Shipping Classification Society to make it safe, reliable and durable.
  16. 16. • To ensure all of this happen, the company was use a special equipment to check the material content. A piece of product will be use for analysis.
  17. 17. • Computer will analyze the content before display it onto monitor screen. • Engineer will read the data and compared it with the manual spec for propeller that which type they built.
  19. 19. BALANCING METHOD • There are two methods of propeller balancing – Static balancing – Dynamic balancing
  20. 20. STATIC BALANCING • Static unbalance is gravity at work. • If a propeller is placed between centers on frictionless rollers the heavy or weighted portion will rotate to the bottom immediately. • This is corrected by adding or removing weight from the propeller.
  21. 21. DYNAMIC BALANCING • Dynamic balancing of a propeller is done to provide for the lowest level of vibration in its operating range. • Professional Dynamic Balancing use sensors to provide data to a digital processor during brief engine runs at 2000-2400rpm.
  22. 22. • Corrective weights measured to the 1/10th gram are temporarily placed under spinner screws or starter ring gear which is measured to ± one degree.
  24. 24. CAVITATION • Cavitation is defined as the phenomenon of formation of vapor bubbles of a flowing liquid in a region where the pressure of the liquid falls below its vapor pressure.
  25. 25. CAVITATION NUMBER • Cavitation calculates by using Euler Number. • The Euler number is a dimensionless number used in fluid flow calculations. It expresses the relationship between a local pressure drop e.g. over a restriction and the kinetic energy per volume, and is used to characterize losses in the flow.
  26. 26. • It is defined as:
  27. 27. • Somewhat the same structure, but with a different meaning is the Cavitation number.
  28. 28. • The Cavitation number is a dimensionless number used in flow calculations. It expresses the relationship between the difference of a local absolute pressure from the vapor pressure and the kinetic energy per volume, and is used to characterize the potential of the flow to cavitate.
  29. 29. • It is defined as:
  31. 31. PODDED PROPULSION • Podded propulsion is a marine propulsion units consisting of electrically driven propellers mounted on a steerable pod. It is also known as azipod (Azimuth Podded Propulsion System).
  33. 33. PODDED PROPULSION • The pod's propeller usually faces forward, as in this puller (or tractor) configuration, the propeller is more efficient.
  34. 34. PODDED PROPULSION • In addition, because it can rotate around its mount axis, the pod can apply its thrust force in any direction.
  35. 35. PODDED PROPULSION • Azimuth thrusters allow ships to be more maneuverable and enable them to travel backward nearly as easily as they can travel forward.
  36. 36. PODDED PROPULSION • The Azipod concept is not practical for use on warships because of damage control difficulties; integrating propulsion with rudder makes both easier to damage or destroy.
  37. 37. AZIPOD CONCEPT • In the traditional azimuth propulsion system the (electric) motor is located inside the ship's hull and rotation is transferred to the propeller through a gearbox.
  38. 38. AZIPOD CONCEPT • In the Azipod system the electric motor is installed inside the pod. The propeller is connected directly to the motor shaft. No gearbox is required, thus providing greater efficiency.
  39. 39. AZIPOD CONCEPT • Electric power for the Azipod motor is conducted through slip rings that allow the Azipod to turn through 360 degrees.
  40. 40. AZIPOD CONCEPT • Because fixed pitch propellers are used in Azipods, power for Azipod is always fed through a variable- frequency drive that allows speed control of the propulsion motor.
  41. 41. THE END