The maximum outer diameter is 600-650 mm, the minimum inner diameter is 5-15 mm, and the minimum wall thickness is 2-5 mm. Because of the strength and rigidity of the piercing needle, the minimum inner diameter and wall thickness of the kneading and kneading drawing pipe are greatly constrained. The minimum inner diameter and wall thickness of soft aluminium alloy pipe can be taken as the lower limit of the above scale, while hard aluminium alloy can be taken as the upper limit during the operation of aluminium coil industry from July 2015 to 2114:30:22. Recently,, when the outer diameter of the pipe is larger, the price difference increases, and the minimum wall thickness of the pipe increases.
Conventional pin kneading method is used to knead the tube with the maximum outer diameter of 600-650 mm aluminium coil, six minimum inner diameter of 5-15 mm, and the minimum wall thickness of aluminium coil of 2-5 mm. Because of the strength and rigidity of the piercing needle, the minimum inner diameter and wall thickness of the kneading and kneading drawing pipe are greatly restricted.
In the meantime, the minimum inner diameter and wall thickness of soft aluminium alloy pipe can be taken as the lower limit of the above scale, while that of hard aluminium alloy pipe can be taken as the upper limit. Recently, when the outer diameter of the tube is large, the minimum wall thickness of the tube is usually not less than 5% of the outer diameter of the tube. Most of the pipes with diameter over 500 mm are formed by reverse kneading.
By using Confrom shunt die kneading, the aluminium coil execution specification can form thin, uniform and small eccentricity pipe compared with the pin kneading method. However, considering the quality of weld seam, I. The maximum outside diameter of pipe that can be formed on the same kneading equipment or that can be kneaded with the same kneading cylinder is smaller than that when kneading with a perforating needle.
Company has learned that with the continuous improvement of cold rolling and drawing technology, the minimum wall thickness of aluminium alloy tubes can reach 0.1-0.2 mm or thinner.
较近在350 MN大型立式揉捏机上(反揉捏)出产揉捏管的较大直径可达l500mm；在196 MN卧式揉捏机上可达l000mm。
Recently, the maximum diameter of kneading tube produced on 350 MN vertical kneading machine (reverse kneading kneading machine) can reach L500 mm, and l000 mm on 196 MN horizontal kneading machine.
The minimum outer diameter of kneading pipe can reach 5 mm.
The maximum diameter of cold-rolled thin-walled tube can be more than 120 mm, and the minimum diameter can be less than 15 mm. The diameter of cold-drawn thin-walled tube is 3-500 mm, and the thin-walled tube with diameter of 3000 mm can be rolled by spinning method.
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