Strength controllable and high tensile aluminium alloy thin plate and its prodn. method

Abstract

An aluminum alloy thin plate with controllable strength and a manufacturing method thereof relates to an aluminum alloy thin plate and a manufacturing method thereof. Most of the thin plates produced by the existing method are in the annealed state, and the uniformity of the structure is not good, which leads to the problem of premature fracture of the material. The present invention is made of aluminum, copper, magnesium, titanium. The method of the present invention is: in the smelting link, add 100 parts by weight of aluminum, 0.09-0.16 parts of copper, 0.02-0.05 parts of magnesium and 0.018-0.03 parts of titanium, the processing state is H14 and O state, and : Homogenized annealing of the alloy material at 600-620°C; hot rolling when cooled to 500-520°C, the final temperature of hot rolling is not lower than 360°C; cold rolling, processing rate 80-85%; after 430-450°C After the intermediate annealing, the finishing rolling with 25-35% processing rate is carried out. When the product manufactured by this method is formed, the sidewall thinning rate is large, the lug is small, the deep drawing is uniform, the thickness thinning rate can reach 45%, the surface is smooth, and the orange-shaped surface will not be produced.

Description

technical field [0001] The invention relates to an aluminum alloy thin plate and a manufacturing method thereof. Background technique [0002] Most of the thin plates produced by the existing processing technology are in the annealed state, the uniformity of the structure is not good, and there are obviously uneven second phase particles in the coarse grains. Thin necks tend to appear prematurely and too quickly during forming. During subsequent use, due to the coarse and uneven grain structure and the existence of second-phase particles, the tendency of the metal to become brittle increases, resulting in material failure. Premature fracture. At the same time, due to the large anisotropy of the material, an ear-making rate of more than 5% will occur. The R value of the stamping part is large and the surface is rough, which leads to a decrease in the yield. Due to the coarse grains, orange peel-like defects appear on the surface of the formed part. Contents of the inventio...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that most of the thin plates produced by the existing method are in the annealed state, and the uniformity of the structure is not good, which leads to the premature fracture of the material, and to provide a production of aluminum alloy thin plates with controllable strength stretching method to increase the thinning rate and avoid the orange peel surface