Modeling and Multi Objective optimization of hot rolling process parameters on mechanical properties An integrated DFA and Moga Approach

Abstract

Rolling is one of the conventional metalworking operations used during the manufacturing of Thermo-Mechanically Treated (TMT) steel rods. TMT steel rods are the backbone of every civil construction. Fe500 TMT steel rods are largely used since they are the best of all grades for civil and architectural construction for their good welding nature, easy bending ability, and excellent ductility. In the rolling mill process, the molten metal billet is allowed to heat up to the desired temperature to reach its required shape and further pressed between the rollers to reshape them into reinforced steel rods. This process does not only reduce the thickness but also makes some significant changes in many properties namely tensile strength, microstructure, and hardness. The process in the rolling mill for producing steel rods enfolds high strength and ductility properties but still enough attention has not been given to finding the effective optimal hot rolling process parameters by researchers. newlineSeveral researchers had exposed that an appropriate selection of process parameters would enhance the mechanical properties. Hence, this investigation will be focused to study the impact of hot rolling process parameters on improving the mechanical properties and minimizing the random length of the rods during production using optimization techniques. For the investigational study, the six most influencing factors were selected to perform the experiments on Fe500 TMT steel rods over three different sizes of 8 mm, 10 mm, and 12 mm diameter. The most influencing factors are observed in the pilot experimental study such as the hot rolling mill process are furnace temperature(and#730;C), finishing mill temperature(and#730;C), mill speed (m/s), water pressure (Kgf/cm2), water flow rate (m3/hr), and cooling bed temperature (and#730;C). newline