Simulation Moldflow

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797 views1 edit(s)3786 characters(s) Page last modified 16:59, 5 Jun 2012 by contentconnector
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Temperature, mold (top) result

    The heat transfer coefficent (HTC) is used during the cooling analysis. As a result, the mold side of the part/mold interface will be slightly cooler than the part side of the interface.

    TipThe HTC is set in the Advanced Options of the Process Settings Wizard.

    Using this result

    Use this result to find localized hot or cold spots, and determine whether they will affect cycle time and part warpage. If there are hot or cool spots, you may need to adjust the cooling channels, or coolant temperature.

    The minimum and maximum mold temperature should be within 10°C of the target temperature for amorphous materials and within 5ºC for semi-crystalline materials. This guideline may be difficult to achieve for most molds, but should be the target of the Cool analysis. The narrower the temperature variation over the mold face, the less likely the mold temperature variation will contribute to warpage and an extended cycle time.

    The Temperature, mold (top) result will typically be between 10ºC and 30ºC above the coolant inlet temperature. Cooling channel placement and the thermal conductivity of the mold will affect the temperature variations. If an automatic Injection + Packing + Cooling time is used, a coolant temperature very close to the target temperature will significantly extend the predicted cycle time.

    NoteIf you use a cooling interface file for a Fill+Pack analysis, the mold temperature is defined as follows:
    • For a Dual Domain model, the average of the top and bottom temperature is used as the mold temperature.
    • For a Midplane model, the top temperature is used as the mold temperature.
    The temperature of the mold should be as close as possible to the analysis target temperature.

    Things to look for

    • Use the following results to check for localized hot spots:
      • Temperature, mold (bottom)
      • Temperature, mold
    • Try to acheive more uniform cooling