Why does the cooling process for profile extrusion become unbalanced?

Why does the cooling process for profile extrusion become unbalanced?


There are five main situations that cause cold imbalance during the extrusion process of profiles:
① Due to the uneven discharge of the profile or significant differences in wall thickness, the amount and heat of the materials held by each part of the profile section are different, and the cooling capacity provided by each part of the shaping mold is also different, which easily leads to cold imbalance;
② Inappropriate design of the cooling water channels will result in inconsistent cooling speeds of different parts of the profile. Some parts of the profile cool faster while others cool slower in the shaping mold;
③ Due to the complexity of the profile section, the cold imbalance occurs during the vacuum adsorption and cooling process of the shaping mold. The shaping mold first adsorbs and cools the visible outer wall of the profile defect, while the inner ribs of the profile do not get synchronous cooling;
④ Long-term use of the shaping mold will cause water scale to form in the cooling water channels to a certain extent, and the water flow will decrease accordingly or even some water channels will be blocked, thereby affecting the uniformity of cooling in different parts;
⑤ If the vacuum circuit is not cleaned for a long time or is not cleaned thoroughly, the precipitated substances will block the vacuum aperture, resulting in a significant reduction in vacuum suction force. The profile cannot closely adhere to the shaping mold, and the heat exchange and cooling will be insufficient or uneven.
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