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 : () Extrusion rations (ii) True strain (homogencous deformation) (ii) Extrusion strain (iv) Ram force

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 : () Extrusion rations (ii) True strain (homogencous deformation) (ii) Extrusion strain (iv) Ram force

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.

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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

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