Proceedings of the Twenty-Fourth International Machine Tool Design and Research Conference pp 59-64 | Cite as
Elastic Stresses and Strains in the Mandrel during the Extrusion and Drawing of Tubes
Summary
Stresses in the hollow mandrel and strains in its bore have been calculated by the finite element method from normal and shear stresses at the deforming material/mandrel interface. The analysis shows the presence of high compressive radial and hoop stresses and large axial tensile stresses in the mandrel at and close to the the deformation zone. The axial stresses are much larger than those due to fractional drag alone and are caused mainly by pressure from the deforming material.
The strains computed for the bore of the mandrel show good agreement with those obtained experimentally.
The results indicate that the proposed theoretical approach could be applied with confidence to predict mandrel stresses and strains in a production tool. Although hydrostatic extrusion/drawing was used both in the experiments and in the theoretical analysis, there is no reason why the same method of computations should not be valid also in the conventional extrusion and drawing of tubes.
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References
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