Production manner null of die and its die of hot runner type injection molding

摘要

The present invention relates to a mold of a hot runner injection molding apparatus capable of injection molding of metal. Heating means for heating the metal in the nozzle is provided at any position of the nozzle. A plurality of temperature measuring points are provided at predetermined intervals between the tip of the nozzle and the heating means. The reference point is defined as the reference of temperature control. When the mold is opened, the heating means is controlled so that the metal of the portion provided with the heating means is kept in the molten state and the temperature of the reference point is maintained at a constant temperature lower than the melting point of the metal. Then, the temperature distribution of each measuring point when the temperature of the reference point is maintained constant is measured, and the result of this measurement stabilizes the solidification state of the metal at the time of the mold opening, and the temperature of the solidified metal is in the temperature range closest to the melting point of the metal Attach. The gate cut portion is set in this temperature region.