Aluminum material for capacitor shell produced by cast-rolled blank, and preparation method thereof

Abstract

The invention discloses an aluminum material for a capacitor shell produced by a cast-rolled blank. The aluminum material for the capacitor shell produced by the cast-rolled blank comprises the following components in percentage by mass: 0.06 to 0.20 percent of Si, 0.40 to 0.65% percent of Fe, 0.08 to 0.20 percent of Cu, less than or equal to 0.03 percent of Mn, less than or equal to 0.03 percentof Zn, less than or equal to 0.03 percent of Ti, less than or equal to 0.03 percent of Ni and the balance Al. A preparation method comprises the steps of conducting raw material casting, conducting primary rough rolling, primary heat treatment, conducting intermediate rolling, conducting primary finish rolling and conducting secondary heat treatment. According to the aluminum material for the capacitor shell produced by the cast-rolled blank, and the preparation method thereof provided by the invention, homogenizing annealing is carried out at the thickness of 1.5 to 4.0 mm, segregation of components and structures is eliminated, cubic textures are increased, annealing is carried out again when a finished product is obtained, rolling textures formed in the rolling process and the cubic textures are reasonably proportioned in number and strength, and eight small lugs with relatively uniform peak heights can be obtained after deep drawing of an aluminum plate, so that the purpose of reducing the lug making rate is achieved, and a deep drawing forming performance of the aluminum material for the capacitor shell is improved.

Description

technical field [0001] The invention relates to an aluminum material used for producing capacitor casings by casting and rolling slabs and a preparation method thereof. Background technique [0002] Aluminum and aluminum alloy strips can be widely used in home appliances, toys, power supplies, energy-saving lamps, communications, national defense, transportation and other fields, such as computer motherboards, automotive circuit boards, etc. The current electronic technology is developing rapidly no matter in depth or breadth, and its application fields have penetrated into all walks of life and families. [0003] Capacitors, as one of the important components of electronic components, have also developed rapidly accordingly. A capacitor is an element whose main features are to store charge and provide capacitance. Its main structure has a layer of dielectric sandwiched between two electrodes and a protective shell. Protective casing materials can be divided into two categ...

AI Technical Summary

Problems solved by technology

Produced by hot rolling method, the product quality, especially the deep drawing performance, is relatively easy to control, but the cost is high; if it is produced by casting and rolling method, due to the special forming process of cast-rolled aluminum plate, it is easy to have uneven grains, segregation, etc. Due to structural defects in punching performance, the quality of the final product is difficult to reach the level of hot rolling, and the shell of the electrolytic capacitor has stricter requirements on material, surface quality, dimensional accuracy, especially punching performance and dimensional tolerance; but Its production cost is low and the profit margin is large