Maurice Tutor

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Teaching Since: May 2017
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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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  • Professor
    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 25 Oct 2017 My Price 7.00

cylindrical billet,

Consider the extrusion of a cylindrical billet, and compute the following.

 

a. Assume the starting billet to have a length of 0.3 m and a diameter of 15 cm .This is extruded into a cylindrical product that is 3 cm in diameter and 7.5 m long (a reduction ratio of 25). Neglecting the areas on the two ends, compute the ratio between the product surface area (wrap around cylinder) and the surface area of the starting billet.

b. How would this ratio change if the product were a square with the same cross-sectional area as that of the 3-cm-diameter circle?

c. Consider a cylinder-to-cylinder extrusion with a reduction ratio of R. Derive a general expression of the relative surface areas of product to billet as a function of R. (Hint: Start with a cylinder with length and diameter both equal to 1 unit. Since the final area will be 1/R times the original, the final length will be R units and the final diameter will be proportional to.

d. If the final product had a more complex cross-sectional shape than a cylinder, would the final area be greater than or less than that computed in part c?

e. Relate your answers above to a consideration of lubrication during large-reduction extrusion operations.

Answers

Maurice Tutor
(5)
Status NEW Posted 25 Oct 2017 02:10 PM My Price 7.00

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