SOME IMPORTANT QUESTION FOR MANUFACTURING SCIENCE 1 FOR UPTU

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                                                 MANUFACTURING SCIENCE-1
  1.What is extrusion? Explain all the types with neat sketches.

  2,Describe the manufacturing process of pipes and tubes.

  3.In a wire drawing operation initial wire diameter is 5.5 mm and final wire diameter is 5 mm.     Die angle is 160 , die land length is 3 mm and co efficient of friction is 0.1. Find the drawing          load. σ0 = 240N/mm2
    From the first principle, derive the formula for wire drawing and assume that there is no           back pull.
 (i) Write a note on rolling defects indicating the defects, their causes and remedies.
 (ii) Calculate the bite angle when rolling 15 mm thick plates using rolls of 400 mm diameter.            Final thickness of plate is 12 mm. 
                                                             
  4.Show that during deep drawing of a cup, the radial stress σr  at radius r is given by 
    σr/2k= µFh/2πKrjt+ ln rj / r, where 
    Fh is the blank holding force, rj is initial blank diameter, t = plate thickness and µ = coefficient of friction and K is shear yield strength.
 5 Draw a sketch of a die punch assembly. What is the function of different parts of the assembly?
 6. A hole of 100 mm diameter is to be punched in a metal sheet of 6 mm thickness. The ultimate shear stress of the metal is 400 MPa. Normal radial clearance is 10 % of sheet thickness and cutting completes at 40 % penetration. Find suitable punch and die meters and the press capacity in metric tons, if a punch without shear is used.Explain different operations performed by die and punch. Also describe the defects occurred in deep drawing operations.
 7  Differentiate between the two.
 (i) Compound and progressive die.
 (ii) Blanking and punching.

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