A kind of preparation method of aluminum alloy pipe with good bending performance
A bending performance and aluminum alloy technology, applied in the field of aluminum alloy, can solve problems such as air leakage, surface quality scratches, etc., and achieve the effects of increasing heating and cooling speed, refining grains, and sufficient annealing
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Embodiment 1
[0060] Carrying and boring the solid ingot to obtain a hollow ingot; the composition of the solid ingot is: 0.06wt% silicon; 0.16wt% iron; 0.02wt% copper; 0.31wt% manganese; 2.48wt% magnesium 0.01wt% of titanium; 0.22% of the total mass content of iron and silicon; the balance is aluminum.
[0061] The cutting slope of the hollow ingot is 1.5mm; the wall thickness difference of the hollow ingot is 1.6mm; the curvature of the hollow ingot is 0.5mm; the outer diameter deviation of the hollow ingot is -1mm; the hollow ingot The inner diameter deviation of the ingot is +0.5 mm; the length deviation of the hollow ingot is +6 mm; the outer surface roughness of the hollow ingot is ≤ Ra12.5, and the inner surface roughness is ≤ Ra6.3.
[0062] The hollow ingot was extruded on a 2500T extruder after being heated at 480°C to obtain a catheter blank; the extrusion was non-lubricated extrusion, and the length of the perforating needle in the extrusion process was 830 mm; the extrusion Th...
Embodiment 2
[0077] The aluminum alloy conduit is prepared according to the method of Example 1; the difference from Example 1 is that it is extruded on a 600T extruder, and the length of the piercing needle is 240mm; the length of the hollow ingot during the extrusion process is 200mm, and the hollow The ingot had an inner diameter of 25 mm, an outer diameter of 31 mm, and a thickness of 3 mm.
[0078] It is carried out in a 1.5T annealing furnace, the temperature of the empty furnace is set at 485-495 ° C, and the temperature is kept for 15 minutes after reaching the temperature; after the oven is finished, the furnace is charged quickly; after the charge is completed, the furnace door is closed immediately, and the furnace temperature is set to 435 ~ 445°C, keep warm for 25 minutes after reaching the temperature, and the whole process from closing the furnace door to the end of the heat preservation should not exceed 65 minutes. After the heat preservation is over, take it out of the ov...
Embodiment 3
[0081]The aluminum alloy conduit was prepared according to the method of Example 1; the difference from Example 1 is that it was carried out in a 1.5T annealing furnace, the temperature of the empty furnace was fixed at 490-500 ° C, and the temperature was kept for 30 minutes after reaching the temperature; after the oven was finished, the furnace was heated rapidly Loading: Close the furnace door immediately after charging, change the furnace temperature to 440-450°C, keep warm for 30 minutes after reaching the temperature, and the whole process from closing the furnace door to the end of the heat preservation does not exceed 65 minutes. After the heat preservation is over, take it out of the oven quickly, and turn on the fan to cool it down quickly.
[0082] According to the method described in the above technical solution, the tensile strength and surface grain size of the aluminum alloy conduit prepared in Example 3 of the present invention were tested. The test results sho...
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