Metal forming analysis — Winter 2022

What do you understand by spring back in press working?

How is contact length affected by elastic deformation of rolls?

Briefly explain Forming limit curve with a neat sketch.

Draw different types of rolling mills used in rolling process.

Discuss various rolling defects.

Explain two dimensional Mohr’s circle method for stress analysis.

What do you understand by anisotropy of sheet metal? How do you measure it?

Explain compound and progressive dies.

Sketch a cross section of a tungsten carbide wire drawing die and show its different portion and their geometry.

Derive the formula for Rolling Load using Slab Method with usual notations.

Define following terms in rolling process (1) Absolute draught (2) Absolute spread(3) Absolute elongation.

Define nesting and explain why it is used in sheet metal operation.

State and prove Hencky’s First theorem.

Draw flow curves for 1) rigid- ideal plastic 2) rigid plastic 3) elastic plastic.

How is impression die forging different from closed die forging?

Determine the forging load at the start and completion of hot forging of a steel billet for the following data, Billet size Length =1.6 m Width = 0.6 m Thickness = 0.2 m Too bite =0.3 m Yield stress = 48 MPa at start = 140 MPa at completion of forging Reduction in forging = 50 %

Describe the method to determine blank size to manufacturing a cup.

Discuss stress and strain in bending.

What do you understand by shear on punch and die? Discuss the relative advantages of providing shear on punch and die.

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

Differentiate direct and indirect extrusion

Explain Isotropic and Kinematic work hardening with neat sketches1

What are slip lines?

Why friction measurement is necessary in forming process?

Explain upset forging process with neat sketch