A New Deformation Model for Bimetal Tubes Extrusion Process

Document Type : Research Article

Authors

Department of Mechanical Engineering, Razi University, Kermanshah, Iran

Abstract

In this paper, bimetal tubes extrusion process through conical dies has been analyzed
by upper bound method using stream functions. The bimetal tube is in un-bonded conditions initially
and the proposed deformation model, investigates the bonding at the interface of two metals in the
deformation zone. For this propose, the deformation region has been divided into three deformation
zones where the position of the start point of bonding at the interface of two metals is determined. For
each deformation zone, an admissible velocity field has been proposed and the internal power, shear
and frictional powers and the total power have been calculated. The total power, which is expressed by
deformation zone boundaries and the position of the start point of bonding, is optimized and the extrusion
force has been calculated. Analytical results are compared with the results given by experimental data
of other researchers and also by finite element method that show a good agreement. Finally the effect of
various extrusion conditions such as reduction in area and semi die angle upon the extrusion force and
the position of the bonding start point at the interface have been investigated.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 49, Issue 4
March 2018
Pages 819-828

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