APPARATUS AND METHOD FOR DIE CASTING

摘要

A method and apparatus is providing for die casting copper and other metals that are cost-effective and practical for production use in die-casting, for example, copper motor rotors. High temperature die material such as nickel, tngsten and molybdenum based alloys with a high melting point are employed, and a die casting apparatus is provided to pre-heat the molds prior to injection of the molten copper. Pre-heating end high operating temperatures provide extended die life. By preheating, the die material experience reduced cyclic stresses associated with thermal expansion, because the thermal shock that results from the difference in temperature between the molten copper and the surface of the mold is reduced, ideally below the yield strength of the mold material. Extended die life provides the opportunity for economically viable copper motor rotor die-casting.