Question

Chapter 2 Fluid Power System Principles 53 Activity 2-3: Hydraulic Production Press The capabilities of a production press must be taken into consideration Production Press and information from the chapter to answer the following vpically used to form and bend diferent types of sheet metal into various shapes. when bending the sheet metal. Use Hydraulic 1. To form a sheet metal workpiece, a hydraulic cylinder on a production press must produce 20,000 lb of force. The a production pre hs a surface diameter of 4 s much pressure is required to apply the required force of 20,000 lb? e production press was manufactured in Europe and the pressure gauge has its units in bars, what is the pres- sure reading if the required force of 20,000 lb is applied? 3. The rod of the piston in the hydraulic cylinder has a diamcter of 2", and the die on the production press weighs 2500 Ib How much pressure is required on the rod end of the piston in the cylinder to retract the rod and the die?

Answer 1

Force F = 20,00016: surface dia D = 4.5 degree Required Pressure = F/A = 2000 times 4/pi (4.5^2) = 1258.16 psi 1 psi = 0.0689476 bar Therefore 1258.16 psi = 86.75 bars Given Dia = 2 in, weight = 2500 lb Required pressure = 2500 times 4/pi (2)^2 = 796.18 psi