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Design of Hydraulic cylinder

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Design of hydraulic cylinder with Matlab code proper step by step.
we have made our design Matlab code so you can learn about cylinder design Matlab code.
attached file of NX design which our 3D design model

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Design of Hydraulic cylinder

  1. 1. BY 14BME131D 14BME132D 14BME133D 14BME134D 14BME 135D 14BME136D Hydraulic Cylinder
  2. 2. Definition Hydraulic Cylinder  A Hydraulic cylinder (also called a linear hydraulic motor) is a mechanical actuator that is used to give a linear force through a linear stroke.  It has many applications, notably in engineering vehicles.  Hydraulic cylinders get their power from pressurized hydraulic fluid (typically oil). The hydraulic pressure acts on the piston to do linear work and motion. This pressure build in the cylinder with the help of the pump acts on the piston head and force is created by the piston.
  3. 3. Cylinder barrel:-  In which a piston connected to a piston rod moves back and forth.  The barrel is closed on each end by the cylinder bottom. These ends are known as the cap end. The cylinder head where the piston rod comes out of the cylinder.  The piston has sliding rings which prevent the hydraulic oil to move from one side of the cylinder to the other.  The seal provides protection to the oil from coming out of the cylinder.
  4. 4. Cylinder Bottom or Cap:-  In most hydraulic cylinders, the barrel and the bottom portion are welded together. This can damage the inside of the barrel if done poorly.  Therefore some cylinder designs have a screwed or flanged connection from the cylinder end cap to the barrel.  In this type the barrel can be disassembled and repaired in future.
  5. 5. Cylinder Head :-  The cylinder head is sometimes connected to the barrel with a sort of a simple lock (for simple cylinders).  In general however the connection is screwed or flanged. Flange connections are the best, but also the most expensive.
  6. 6. Piston:-  The piston is a short, cylinder-shaped metal component that separates the two sides of the cylinder barrel internally.  The piston is usually machined with grooves to fit elastomeric or metal seals.  These seals are often O-rings, U-cups or cast iron rings. They prevent the pressurized hydraulic oil from passing by the piston to the chamber on the opposite side.  This difference in pressure between the two sides of the piston causes the cylinder to extend and retract.
  7. 7.  Piston seals vary in design and material according to the pressure and temperature requirements that the cylinder will see in service.  Generally speaking, elastomeric seals made from nitrile rubber or other materials are best in lower temperature environments  The best seals for high temperature are cast iron piston rings.
  8. 8. Piston Rod  The piston rod is typically a hard chrome-plated piece of cold-rolled steel which attaches to the piston and extends from the cylinder through the rod-end head.  In double rod-end cylinders, the actuator has a rod extending from both sides of the piston and out both ends of the barrel.  The piston rod connects the hydraulic actuator to the machine component doing the work.  This connection can be in the form of a machine thread or a mounting attachment such as a rod-clevis or rod-eye.
  9. 9. 𝑪𝒂𝒍𝒄𝒖𝒍𝒂𝒕𝒊𝒏𝒈 𝑫𝒊𝒂𝒎𝒆𝒕𝒆𝒓 𝒐𝒇 𝒑𝒊𝒔𝒕𝒐𝒏 𝒓𝒐𝒅 𝒖𝒔𝒊𝒏𝒈 𝒃𝒖𝒄𝒌𝒍𝒊𝒏𝒈 𝒆𝒒𝒖𝒂𝒕𝒊𝒐𝒏  𝑷𝒂𝒄𝒕 = 𝑷 𝒄𝒐𝒔𝜽  𝑷𝒅𝒆𝒔𝒊𝒈𝒏 = 𝑷𝒂𝒄𝒕 × 𝑭𝑶𝑺  𝑭𝒄𝒓 = 𝒏𝝅 𝟐 𝑬𝑰 𝑳 𝟐  𝑰 = 𝝅𝒅 𝟒 𝟔𝟒  𝑫 = 𝟐. 𝟓𝒅 𝑬𝒎𝒑𝒊𝒓𝒊𝒄𝒂𝒍  𝑫𝒊 = 𝑫 + 𝟓(𝑬𝒎𝒑𝒊𝒓𝒊𝒄𝒂𝒍) Design Calculation Pact=load acting on inclined cylinder 𝜃 = 𝐴𝑛𝑔𝑙𝑒 𝑏𝑒𝑡𝑤𝑒𝑒𝑛 𝑣𝑒𝑟𝑡𝑖𝑐𝑎𝑙 𝑎𝑛𝑑 𝑎𝑥𝑖𝑠 𝑜𝑓 𝑐𝑦𝑙𝑖𝑛𝑑𝑒𝑟 E=Youngs Modulus I=Moment of inertia of circular rod d=Diameter of piston rod D=Diameter of piston Di=Internal diameter of cylinder barrel
  10. 10.  CALCULATING THE THICKNESS OF THE BARREL The lame's equations are:-  𝝈 𝒓 = 𝒃 𝒓 𝟐 − 𝒂  𝝈 𝒄 = 𝒃 𝒓 𝟐 + 𝒂  𝝈 𝒓 = 𝑷 𝒅𝒆𝒔𝒊𝒈𝒏 × 𝒈 𝝅 𝑫 𝟐  Barrel must be strong enough to absorb all the stress such that the stress at the outer surface of the barrel must be zero.  𝝈 𝒓=𝟎 (at radious ro)  𝒕 = 𝒓 𝟎 − 𝒓𝒊 σr = The radial stress σc = The circumferential stress a and b = constants t=cylinder barrel thickness
  11. 11. Industrial Visit
  12. 12. Hydraulic Press Cylinder
  13. 13. Dimensions  d=Diameter of piston rod=22mm  D=Diameter of piston=55mm
  14. 14. Video
  15. 15. Matlab Code
  16. 16. Reference:-  Design data handbook  Shigley  V.B Bhandari  http://www.mechanicalhero.com/2012/09/design-calculation- analysis.html