Patent ID: 6666259
Filing Date: 2003-12-23
Classification: B22D

Abstract:
A method for manufacturing a mold of a metal hot-runner injection molding machine, comprising the steps of:disposing at least one temperature control target point, as a reference for a temperature control by heating means for heating a nozzle, between the heating means and a tip of the nozzle, controlling said heating means such that upon a mold opening, at least a portion of metal adjacent to the heating means becomes a molten state and that a temperature of said temperature control target point is kept at a constant level which is lower than a melting point of the metal, measuring a temperature gradient between the heating means and the tip of the nozzle when the temperature of the temperature control target point is kept constant, selecting an area in the nozzle based on the measurement of the temperature gradient such that the metal in the nozzle upon a mold opening has a temperature at which a solidified condition of the metal can be stably maintained, said temperature being close to a melting temperature of the metal, and determining a gate cut portion in the area.