Data based model predictive control for ring rolling

Thermomechanical ring rolling is an evolution of the process where deformation and heat treatment are combined to obtain a product with both the desired geometry and hardness or microstructure in a single step. However, the high sensitivity of the process to the initial condition and to various disturbances limits its repeatability and accuracy. In this paper, the authors implement a concept for hardness control of ring rolling in virtual experiments. A concept based on soft sensors and model predictive control is implemented on a digital twin. The operation of the different models needed for this control loop are detailed and the controller itself is illustrated.

Modern methods for studying of phase transformations in high-carbon wire rod to ensure quality of high-strength reinforcement

The structural transformations (formation and decay of austenite) in high-carbon boron microalloyed 80R steel are studied by the differential scanning calorimetry method. The temperatures of the beginning and end of the formation of homogeneous austenite during heating and its decay during cooling, proceeding according to the type of ferritic-carbide mixture with the release of the α-phase of one morphological type, are determined. The obtained results can be used to select one of the main technological parameters of the deformation and heat treatment mode of rolled products — the rational austenization temperature, which ensures the formation of structure and properties in high-carbon wire rod intended for the manufacture of high-strength stabilized reinforcement for iron-concrete structures.

The influence of process of manufacturing and heat treatment on performance and dimensional stability of the Cu—Ni—Si alloy

The possibilities of improving the properties and increasing the dimensional stability of material of the special Cu—Ni—Si alloy for the parts of electric vacuum microwave devices by the deformation and heat-treatment methods are analyzed.