Experimental determination of energy-power parameters and components of deformation during cyclic forming of material

Production of special types of rolled nonferrous alloys using the combined technology of casting and deformation is a relatively new trend in resource-saving metallurgy. In domestic practice such techniques are implemented in the device for continuous casting and metal deformation. The key features of this device are cyclicity of process and the presence of large irreversible deformations of the workpiece (a strip of rectangular cross section in movable crystallizer, closed on four sides). These features lead to the problem of experimental data obtaining on the energy-power parameters of deformation, as well as the distribution and intensity of the strain state of the workpiece. In this paper, we propose a method for determining the instantaneous power of irreversible form changing by means of indirect measurements. The technique based on the detection and analysis of changes in the electrical characteristics of the motor drive in two modes of operation of the plant: cyclic deformation of the specimen and the motion of plant components without specimen deformation. We propose a method for directly measuring the components of the plastic deformation of the workpiece based on the method of knurled dividing grid with subsequent calculations by the Zibel's method. The experimental results indicate the expressed triaxial strain state of the workpiece because of the combined action of elongation and shifts in two mutually perpendicular planes. Verification of software package LS-DYNA carried out based on obtained experimental data by solving the problem of constrained shear, which coupled with the large plastic deformations.

cyclic forming, components of plastic deformation, strain intensity, power of irreversible form changing, deformation tool