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As an important engineering material, aluminum alloy profile is widely used in each department of national economy. With polyurethane mandrel in the hollow of the profiles, equal channel angular pressing (ECAP) can be used to refine mechanical properties of these hollow materials with good shape control effects. However, based on existing researches, the hollow profiles are only limited to circular ones. In this paper, a mechanical analysis of a square tube in ECAP with polyurethane mandrel is provided. Through the slab method in different deformation planes, the mechanical mechanism of shape control effects is found. The thicknesses can be maintained as its initial ones after ECAP. Both simulations and experiments are used to verify the calculated results by the analysis. After calculating, most errors between the final and initial thicknesses in both simulations and experiments are less than 10%. [ABSTRACT FROM AUTHOR]

Dieless drawing is one of the most advanced processing technologies. After heating and cooling, the diameters of the wires or rubes can be reduced without drawing dies. Comparing to the traditional drawing processes, the workpiece is no longer touched with the processing equipment. The production efficiency is increased while the consumption of energy is also saved. In this paper, the dieless drawing process will be researched based on the gradient slab method. All the significant parameters in this process will be taken into the consideration, such as drawing velocities, thermal properties, and temperature conditions and geometrical parameters of material. The effects of pairwise related parameters on the final area and temperature as well as deformation length will be shown in three-dimensional diagrams. A novel analysis model of dieless drawing will also be proposed based on vertical gradient slab method. This model will be seen as a strong theoretical support for studies of dieless drawing. [ABSTRACT FROM AUTHOR]