Metal forming analysis — Summer 2023

Define following: 1. Flow stress, 2. Strain Hardening, 3. Strain rate.

Give classification of metal forming processes and its advantages.

Draw and explain typical stress-strain diagram for ductile material.

Differentiate open die forging and closed die forging.

Discuss the different defects in extrusion processes.

Explain Extrusion and Wire Drawing processes in brief.

Give list of methods used for calculation of extrusion load and explain any one of them in brief with neat sketch.

Why friction measurement is necessary in forming process?

How is impression die forging different from closed die forging?

Derive the relationship between Yield strength in Shear and Yield strength in Tension according to Tresca's hypothesis of yielding.

Differentiate direct and indirect extrusion process.

What are the benefits of hydrostatics extrusion process?

Derive the relationship between Yield strength in Shear and Yield strength in Tension according to Von Mises’ hypothesis of yielding.

Define (i) dry drawing (ii) wet drawing (iii) tube drawing.

Discuss on materials used for making wire drawing dies.

Determine engineering strain, true strain & reduction for a) Bar is doubled in Length b) Bar is halved in length.

Discuss effect of temperature on yield strength.

Explain various Rolling defects.

Discuss analysis of strip rolling derive equation for projected arc length.

Differentiate blanking and punching operation with sketch.

What is Drawability? List and Discuss factor Affecting to Drawability.

Discuss stresses developed in deep drawing process with neat sketch.

Define (1) Notching (2) Nibbling (3) Slitting, for pres work.

Explain spring back effect in bending process.

Explain a) Forming Limit diagram b) Anistrophy in sheet metal.