Hollow Twist Extrusion: Introduction, Strain Distribution, and Process Parameters Investigation

다국어 초록 (Multilingual Abstract)

Twist Extrusion is kind of severe plastic deformation process which enhances the strength of materials by applying a shearplastic strain and consequently grain refinement. The strain distribution is minimum at the center of the die and is maximumat outer surfaces. In this article, the plastic strain distribution will be studied within a hollow section. The billet is solid inprevious experimental and numerical studies in the literature, but by adding a new die (mandrel) for extruding the hollowbillet, it is possible to twist extrude hollow sections. A finite element model is developed in the ABAQUS finite elementsoftware and the effects of process parameters (slope line angle, thickness and friction coefficient) on equivalent plastic straindistribution are investigated. The numerical results show that the equivalent plastic strain will be increased by increasingthe slope line angle and decreasing the thickness and more homogeneity in the strain field will be obtained. In addition,increasing the friction coefficient higher than 0.2 can lead to an increase in induced plastic strain. The required force fortwist extrusion will be increased by increasing the friction coefficient.

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