What do you understand by forming of metal
[3 marks]What is recrystallization? State its important in metal forming.
[4 marks]Explain in detail Two-Dimensional Mohr’s circle diagram for stress analysis.
[7 marks]What is bending? Also explain bend angle and bend allowance with sketch.
[3 marks]Elaborate board drop hammers used in forging process with neat sketch.
[4 marks]Write short note on (1) forming limit diagram (2) anisotropy of sheet metal
[7 marks]What is Hencky’s first theorem concerning slip lines in metal forming, and prove it with usual notations.
[7 marks]Explain effect of (1) strain rate (2) Temperature (3) friction on metal forming process.
[3 marks]Draw sketch of (1) Two high (2) three high (3) four high (4) cluster, rolling mill with usual notation.
[4 marks]Describe Upper bound and Lower bound theorem in metal forming.
[7 marks]Explain (1) absolute draught (2) relative draught (3) co-efficient of elongation in rolling process
[3 marks]Define for forging. (1) Flash (2) Cutter (3) Draft (4) Parting line
[4 marks]Write short not on (1) hydrostatic extrusion and (2) Impact extrusion.
[7 marks]Ashell having 32 mm diameter and 108 mm height with a wall thickness of 0.8 mm is to be manufactured from 1.1 mm thick metallic sheet. Calculate the blank diameter.
[3 marks]State and explain different materials used for making wire drawing dies.
[4 marks]Explore the theory of slip lines from a different angle.
[7 marks]Calculate the bending force for a 450 bend of aluminium sheet 1.8 mm thick and 1200 mm long with a die opening 8 times the metal thickness. Take die opening factor 1.3 and ultimate tensile strength is 3400 kg/cm2
[3 marks]What is cutting force and how it reduces in sheet metal work.
[4 marks]What you know about Isotropic and Kinematic work hardening explain with neat sketches.
[7 marks]Explain relationship between extrusion ratio, temperature and pressure
[3 marks]Explain Nesting in sheet metal work.
[4 marks]Classify dies use in sheet metal and explain progressive die with neat sketch.1
[7 marks]Explain function of pilot and state method of fitting of pilot.
[3 marks]Define (1) Notching (2) Nibbling (3) Slitting (4) Perforating for press work.
[4 marks]Asteel washer is of 44 mm outer diameter and 25 mm inner diameter and is 12 mm thick. If maximum shear stress is 405 N/mm2 and percentage penetration is 24 find (1) work done (2) shear to be ground if maximum punch force is to be reduced to.0.05 MN.
[7 marks]