[China Aluminum Network] Extrusion The performance of a pure aluminum-aluminum pipe, whether it is the height, the rolling elongation, or the rolling yield, is determined in terms of impact. The effect of extrusion on pure aluminum tubes is reflected in the following aspects:
1, mold
The design of the extrusion die of common non-rolled aluminum tubes does not need to consider the problem of full welding. Under normal inspection conditions, the appearance is not observed by naked eyes, and no obvious line of cracking can occur. Under such conditions, the internal bearing Pressure capacity can generally be 1.5 times higher than the index value. However, for pure aluminum round tubes, the requirement of welding is very important. At this time, the design of ordinary molds cannot meet the requirements. Compared with ordinary molds, efforts should be made to fully weld the molds. For a full Shen bridge treatment, in this state, there is a difference of 10-12 mm from the normal mold. This has a profound effect on the cracking degree of the rear wing fins of pure aluminum tubes.
2, warming
Normal aluminum rod heating is generally between 450-490 °C, insulation 2.5 hours or so, but for aluminum rod heating aluminum rod is not applicable. After a long period of trials, groping and trial production have found that the heating temperature is controlled between 500 and 530°C, and it is more reasonable than 2.5 hours. This will ensure adequate welding, lift height and elongation.
3, cooling
For the required H112 state, no full air cooling is required as long as the aluminum tube does not burn the cooling bed and does not affect the subsequent straightening temperature.
4, straightening
Due to the material and temperature, the ratio of straightening stretch to tube length for pure aluminum tubes is between 30:8400.
5, sawing
The pure aluminum tube has strict requirements on the length of the head at both ends when sawing. Experience and calculations have proved that it is very suitable to remove the material head with a length of ≥ 1.8m.
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