What are the processing technologies of refrigeration copper tubes?

At present, the processing technology of refrigeration copper tube is mainly divided into: upward drawing technology, continuous casting and rolling technology and extrusion technology. Updraw method: The basic feature of copper tube continuous casting by updraw method is "oxygen-free", that is, the oxygen content is below 10ppm. In the whole process of copper liquid transfer and crystallization from electrolytic copper smelting, measures such as charcoal reduction, flake graphite covering and oxygen isolation were adopted. Oxygen exists in copper liquid in the form of copper oxide and cuprous oxide, and charcoal can be reduced at high temperature to make its oxygen content less than 10ppm. Due to the protective atmosphere of CO and the oxygen isolation of flake graphite, stone tools will not be oxidized during crystallization. Continuous casting and rolling process: Continuous casting and rolling (CCDR) is a steel rolling process in which molten steel is poured into a continuous casting machine and rolled into billets (called continuous casting billets), which are kept in soaking pits for a certain period of time and then directly rolled into hot continuous rolling mills without cooling. This process skillfully combines casting and rolling. Compared with the traditional process of casting billet first, heating in heating furnace and then rolling, this process has the advantages of simplifying the process, improving working conditions, increasing metal yield, saving energy, improving the quality of continuous casting billet, and facilitating mechanization and automation. Extrusion process: Extrusion process refers to the extrusion of copper blank tube by copper tube extruder, which makes the density of copper tube more uniform and achieves higher compression resistance.