Bar stock of initial diameter = 90 mm is drawn with a draft = 15 mm. The draw die has an entrance angle = 18°, and the coefficient of friction at the work‑die interface = 0.08. The metal behaves as a perfectly plastic material with yield stress = 105 MPa. Determine (a) area reduction, (b) draw stress, (c) draw force required for the operation, and (d) power to perform the operation if exit velocity = 1.0 m/min

A sheet 300mm wide 25mm thick with two drives, each with a radius of 250mmit is passed through a rolling stand with rollers. Work is thickness in one layer at 50 rpm roll speed 22reduced to mm. The work material has a yield curve determined by K = 275 MPa and n = 0.15.The friction coefficient between the rollers and the work is considered to be 0.12. Successful rolling of frictionDetermine if it is sufficient to allow its operation. If it is sufficient;a) Rolling force,b) Momentc) Calculate the power.

Question 3 A rolling operation on a 250 mm wide, 8 mm thick, 1112 cold rolled steel takes place using hardened steel rolls with a surface finish of 0.03 um. The rolls have a diameter of 350 mm and rotates at 115 rpm. The final thickness of the plate is 6 mm and the entry speed of the plate is 1.8 m/s. Calculate: 3.1 The minimum coefficient of friction required, that will make the rolling operation possible. 3.2 The required roll force. 3.3 The position of the neutral point, xn 3.4 Indicate, using a sketch, the neutral point showing all relevant notation and dimensions.

Calculate (1) die pressure distribution and (2) forging force for plane strain forging (open die forging). Assume yield strength of the material is Y, and yielding criterion is von Mises. ho 2Lo h Forged to 2L xdx L 'x+value Note: Assume Zo Constant Plane strain Die pressure distribution h L L Die pressure distribution h MATERIAL L dx -(-1) Friction Hill Y L When 0; =Y P=Y' = Calculate forging force X L dF elemental volume Average pressure

Maximum reduction in thickness for one pass in rolling process is Ahmas that can be expressed by Ah = u'R, where u is coefficient between contact surfaces and R is roller radius. Then, angle subtended by the deformation zone for u =0.1 (in degree) is friction max

A small connecting rod is forged from AISI 1015 steel at 1200oC. Calculate the forging force in a mechanical press at a speed of 200 mm / s when the die comes into contact with the part. The volume of the connecting rod is estimated to be 28680 mm3, and 20% of the starting material is expected to burn off as flash (flash). In the final form the projected area is 3500 mm2 without flash. The width of the flash is 7.6mm around 300mm in circumference.

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

Note:- • Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. • Answer completely. • You will get up vote for sure.