Knowledge of Aluminum Veneer Cooling and Bending

The aluminum veneer of profiles used in all walks of life is increasing, it is in the form of a variety of common use of aluminum in the form of an increasingly diverse and complicated, aluminum veneer cooling winding is a kind of important technology of aluminum sheet, the research found that, in today's cooling method as well as the premise, the profile normal cooling on the cooling bed, after discharge to hollow out after a few minutes will be aluminum parts perhaps wall thickness thicker parts winding phenomenon, this kind of attack tortuous process after cooling, can be divided into the following several stages. Aluminum ceiling tile factory shares with you.

The temperature of the thin-walled part of the profile falls fast, and the first attack is the contraction force. The temperature of the thick-walled part of the hollow part of the tube falls relatively slowly, with almost no contraction force. Thin-walled parts of the cross-sectional area are small, the onset of a smaller tightening force maybe the tractor traction eradication; Profile from the tractor, the temperature continues to fall.

Section area of the section of thick wall or hollow tube is larger, with the temperature falling gradually onset of larger tightening force, the temperature of the thin-wall part has dropped substantially, no longer onset of tightening force or smaller tightening force; The size of the compression force on the section of the section is uneven, the section along the direction of kneading to the thick wall part of the hollow tube part twists and turns.

Exploring the experiment found that aluminum veneer appearance, the partial cooling method can be useful to adjust material discharging after cooling uniformity. The key reason is as follows: ordinary air-filled premise, profiles for each part in touch with air heat transfer coefficient are appropriate, but because the wall thickness or form difference, the different parts of the heat dissipation rate not appropriate, so thick wall department or hollow tube heat dissipation rate is slower than the thin-wall part.

When one-sided high-pressure air fog is used for cooling, the heat transfer rate can be increased because there are two heat transfer media, air and water, and the heat transfer coefficient of water is higher than that of air. The high-pressure air atomizes the water, increases the surface volume of the contact between the water and the profile, destroys the vapor film of the contact between the water and the profile, and increases the heat exchange efficiency. The high-pressure air spray nozzle has strong directivity, the Angle of air mist is about 25°-30°, can end the partial cooling without affecting other parts of the profile.

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