The process sounds easy. The two die halves are attached to the 670-ton die casting machine. Preheated stacks of electrical steel laminations are set between the dies. Pure copper which has been rapidly melted in a high-frequency induction furnace is injected into the dies. Voila! The melting point of copper is, however, at 1083-degrees C, more than 400-degrees C higher than aluminum. Much greater injection pressure is also necessary. This is what has made the die casting of pure copper so difficult. With the help of the International Copper Association, we were the first (and at this time only) company in Japan to master the technology required for the mass production of die cast pure copper rotors.