The production of copper bars involves several key steps. First, copper ore is refined to produce high-purity copper. This copper is then melted in a furnace to form molten copper. The molten copper is cast into bars through either upward casting or horizontal continuous casting processes. After casting, the bars are cooled and undergo rolling to achieve the desired dimensions and specifications. Finally, the copper bars are subjected to stretching and annealing treatments to enhance their mechanical properties and conductivity, ensuring consistent quality throughout the production process.