Abstract
This article describes the results of a study that looked at the stress state and the specific force or contact pressure through the application of the slip line method and computer simulation (i.e. using the Deform 3D software package) when a workpiece was subjected to severe plastic deformation (SPD) in a special closed die. SPD is achieved when a flat punch is embedded in a round workpiece enclosed in the die and alternately compressed by a ring-shaped punch. Analysis of the results shows that compressive stresses prevail in the deformation zone resulting in the production of blanks with ultrafine-grained and/or nanostructure, as well as high mechanical properties. The relative discrepancy between the results obtained through the slip line method and those obtained through modelling in Deform 3D was about 1.3% indicating that the results can be considered reliable. It should be noted that this closed-die technique can be used to produce such products as gears, i.e. heavy-duty parts.
Highlights
The process of intensification and plastic deformation in the processing of metals by pressure is one of the main task at the present stage of the development of science and technology, in particular, in the processing of materials
We present the results of an investigation of the stressed state and the determination of the contact pressure of the deformation of the circular billet in a closed matrix (Fig. 1)
To determine the specific force and stress state, when the flat central and annular punches are inserted into the blank, a field of slip lines is constructed (Fig. 1 and 2)
Summary
The process of intensification and plastic deformation in the processing of metals by pressure is one of the main task at the present stage of the development of science and technology, in particular, in the processing of materials. Determination of the stress state and specific deformation force of blanks in a closed matrix by the method of slip lines. To determine the specific force and stress state, when the flat central and annular punches are inserted into the blank, a field of slip lines is constructed (Fig. 1 and 2). Software complexes, such as Deform 3D, based on the finite element method are widely used, in particular in metal pressure machining, which accurately provides information on stresses and deformations in the volume of the deformed body We use this method to determine the stress state and the specific deformation force in the SPD of the blank in a closed matrix. It should be noted that in computer simulation, aluminum billet was used to calculate the stress state
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