MANUFACTURING METHOD OF THE HOLLOW COIL AND MANUFACTURING METHOD OF THE GENERATOR ROTOR COIL INCLUDING THE SAME AND THE GENERATOR ROTOR COIL INCLUDING THE SAME FOR IMPROVING THE CHARACTER OF MATERIAL

摘要

PURPOSE: A manufacturing method of the hollow coil and manufacturing method of the generator rotor coil including the same and the generator rotor coil including the same is provided to improve the reliability of product by keeping the grain efficiently through the cold processing.;CONSTITUTION: A manufacturing method of the hollow coil comprises the following steps. The electrolytic copper is put into the high-frequency induction furnace and it melts. In the electrolytic copper dissolving in the high-frequency induction furnace, the oxygen and the gas are eliminated. In the electrolytic copper dissolving, the oxygen and the gas eliminate. The silver is put into the high-frequency induction furnace and it melts. In the electrolytic copper and the silver dissolving, the component content of the silver is analyzed. Since analyzing the component content of the silver, it turns on water and the predetermined shape is manufactured. It punches and the predetermined shape melted and casted is extruded to the predetermined pipe. The predetermined pipe which punched is extruded is heat-treated. The annealing and the drawing are at least once in the above heat-treated.;COPYRIGHT KIPO 2012