Both extrusion and bar drawing processes can be used to reduce the cross section. What can be the basic differences between extrusion and bar drawing processes? Also discuss briefly why must the drawing stress never exceed the yield strength of the work metal?

Please solve with little explanation

answer the questions

Blocks A and B have a masses of 150 kg and 280 kg, respectively. (Figure 2) The coefficient of static friction between A and B and between B and C is 0.290. The coefficient of static friction between the rope and peg E is 0.570. Pulley D rotates freely, and P = 27.0 N. If \theta = 60.0 degrees, what is the smallest magnitude, T, of tension, T, that causes block B to move? P A B E T

Example 10.3 A cylindrical billet of 40 mm diameter and 100 mm length is reduced by indirect (backward) extrusion to a 15 mm diameter using Flat dies. If the Johnson equation has a = 0.8 and b = 1.5 and the flow curve for the work metal has K = 750 MPa and n = 0.15, determine : (i) Extrusion rations (ii) True strain (homogencous deformation) (iii) Extrusion strain (iv) Ram force

Pressure on the ram ?

Write a detail note on direct extrusion process.

A billet 75mmlong and 25mmin diameter is to be extruded in a direct extrusion operation with extrusion ratio rx = 4.0. The extrudate has a round cross section. The die angle (half angle) = 90° The work metal has a strength coefficient = 415 MPa, and strainhardening exponent = 0.18. Use the Johnson formula with a = 0.8 and b = 1.5 to estimate extrusion strain. Determine the pressure applied to the end of the billet as the ram moves forward

Using average pressure formulas and ignoring barrelling, plot the force (vertical axis) versus reduction-in-height (horizontal axis is *100) curve in open-die forging of a cylindrical, annealed copper specimen whose height is 1 in and diameter is 1 in, from reduction-in-height of 0% to 75%, when the friction between the flat dies and the specimen ho-h ho is a) μ = 0 b) μ c) μ = 0.1 0.2

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