Broken-belt reduction control method for cold rolling production of 5182 aluminum alloys

Abstract

The invention relates to a broken-belt reduction control method for cold rolling production of 5182 aluminum alloys. The control method includes the steps: building side covering weight of belt materials to obtain a plate shape distortion function based on original rolling process of the 5182 aluminum alloys; optimizing rolling reduction and rolling oil parameters. According to control method, the 5182 aluminum alloys have the advantages that belt breaking frequency of a cold-rolling mill can be reduced, production efficiency is improved, production safety is ensured, and product quality is stabilized.

Description

Technical field [0001] The invention relates to the field of cold rolling, in particular to a control method for cold rolling to produce 5182 aluminum alloy to reduce strip breaks. Background technique [0002] The company’s leading product 5182 aluminum alloy material is mainly arranged in the Φ440 / Φ520 / Φ1250×1850 / 2050 / 18003# cold rolling mill. 5182 is one of the high-strength alloys in the 5XXX series alloys, and its Mg content is higher due to the atomic radius of AL than Mg The atomic radius of is small, so Mg produces a strong strengthening effect in AL; with the increase of Mg content, the strength of the alloy increases, and the plasticity decreases. The finished products of 3.0mm-0.216mm hot-rolled billet are produced in 6 passes. After the processing rate reaches 45%, the tensile strength Rm≥380Mpa and the yield strength Rp0.2≥330Mpa; the work hardening is intensified; the plasticity decreases, and the rolling process is easy Causes the tendency of edge cracking, leadin...

AI Technical Summary

Problems solved by technology

The hot-rolled billet 3.0mm-0.216mm finished product is arranged in 6 passes. After the processing rate reaches 45%, the tensile strength Rm≥380Mpa, the yield strength Rp0.2≥330Mpa; the work hardening intensifies; the plasticity decreases, and the rolling process is easy Cause edge cracking tendency, resulting in broken belt

[0003] Secondly, in the rolling process, due to the uneven temperature distribution of the roll body, the temperature of the middle roll is higher than that of the edge, that is, there is a temperature difference between the middle and the edge; the edge strip is subjected to tension, and there is a large tensile stress on both sides of the material, so that Increased tendency of material to crack edges

Domestic advanced rolling mills use hot side spray to control the temperature around the roll sides, reduce the temperature difference of the roll body, and achieve the effect of controlling the tight edge of the strip. With roll hot oil injection, the ability to control the temperature difference at the edge is limited; when the product is produced with a plate shape curve, it is easy to break the strip, the thinner the thickness, the harder the processing, the broken strip rate reaches 20-25%, and the exit thickness is ≤0.5 mm pass, the rate of strip breakage in this pass reaches 60%, and the thickness of the product is less than or equal to 0.5mm and cannot be produced in this rolling mill.

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