Mold temperature must be precisely controlled within the 100–300°C active window range—the optimal interval for release agent activation.
Below 100°C: The release agent fails to evaporate and form a protective film, causing direct contact between the casting and mold, which leads to mold sticking.
Above the Leidenfrost point (≈250°C): A steam layer forms, blocking the release agent from wetting the mold surface—this also results in lubrication failure.
For example, a die-casting plant encountered repeated mold sticking in its core-pulling area due to local mold temperatures as low as 80°C. Infrared thermography revealed that over-spraying caused excessive cooling. After adjusting spraying parameters, mold temperature rose to 120°C, eliminating the defect.
Scientific Regulation Recommendations:
Use an infrared mold thermometer to monitor hot spot areas (e.g., thick sections, core-pulling zones) in real time.
Dynamically balance mold temperature by coordinating spraying time and cooling system output.
Avoid single-point over-spraying, which causes localized heat loss and inconsistent demolding performance.
Abnormal Mold Surface Temperature (模具表面温度异常)
Demolding Failure (脱模失效)
Active Window Range (活性窗口区间)
Leidenfrost Point (莱顿弗罗斯特点)
Infrared Thermography (红外热成像)
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