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Method and apparatus for controlling injection molding

  • US 5,411,686 A
  • Filed: 12/23/1992
  • Issued: 05/02/1995
  • Est. Priority Date: 12/26/1991
  • Status: Expired due to Fees
First Claim
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1. An injection molding control method for controlling the temperature of an injection mold when injection molding is performed using the mold, wherein the mold has mold cooling channels arranged around a cavity and a temperature adjusting portion for adjusting the temperature of a molten resin is arranged in a passageway leading from an injection molding machine to the cavity, said method comprising the steps of:

  • measuring characteristic quantities of mold temperature in a molding cycle;

    measuring coolant temperature of the cooling channels;

    measuring the temperature of the molten resin maintained in the temperature adjusting portion;

    identifying a response model of a variation in mold temperature using measured values obtained at the foregoing measurement steps;

    determining whether there is a cause of fluctuation in mold temperature at the start of injection;

    in a case where there is a cause of fluctuation in mold temperature, calculating a target value of coolant temperature, which is for holding the mold temperature constant at the start of injection, using the response model; and

    controlling temperature or flow rate of the coolant in such a manner that the temperature of the coolant in the cooling channels will attain the calculated target value.

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