Explain clearance in sheet metal operation.
[3 marks]How do you represent strain hardening effect?
[4 marks]State general advantages of metal forming.
[7 marks]Define (i) dry drawing (ii) wet drawing (iii) tube drawing.
[3 marks]State difference between hot forming and cold forming.
[4 marks]What do you understand by camber of sheet and camber of roll?
[7 marks]Explain two dimensional Mohr’s Stress circles.
[7 marks]What do you understand by shear on punch and die?
[3 marks]Explain spring back effect in bending process.
[4 marks]State and prove Hencky’s First theorem.
[7 marks]Define angle of bite and discuss its effect in rolling process.
[3 marks]State various factors which affect the FLD (Forming Limit Diagram).
[4 marks]Explain VonMises & Tresca theory of yielding.
[7 marks]State types of rolling mills used in rolling process.
[3 marks]Differentiate direct and indirect extrusion process.
[4 marks]What is drawability? List and discuss factor affecting to drawability.
[7 marks]What is upset forging?
[3 marks]What are the benefits of hydrostatics extrusion process?
[4 marks]Explain Isotropic and Kinematic work hardening with neat sketches.
[7 marks]Why friction measurement is necessary in forming process?
[3 marks]How is impression die forging different from closed die forging.
[4 marks]Acircular cylinder of 100 mm diameter and 160 mm height is compressed to 40 mm height between two flat dies at 10000 C. taking that there is a sticking friction over the entire contact are of disc, determine the maximum die pressure and average die pressure. The yield strength at 10000 Cis 75 N/mm2.
[7 marks]Discuss on materials used for making wire drawing dies.
[3 marks]State difference between compound and progressive dies.
[4 marks]How does hydrostatic pressure affect the yield strength of metal?1
[7 marks]