A hot rolling production process of aluminum foil for electrolytic capacitors

Abstract

The invention relates to a hot rolling production process of an aluminum foil for an electrolytic capacitor. According to the hot rolling production process for the aluminum foil for the electrolyticcapacitor, a single-machine frame four-roll reversible hot-rolling unit is adopted to carry out hot rolling on a thick plate ingot, and the plate ingot biting speed, the rolling method and the speed and the bending roll control are controlled, wherein during the initial rolling stage, the plate ingot biting speed is 60 m / min; during rolling, the heavy reduction rate is adopted, and the single passreduction rate reaches 50%-70%; and the rolling speed during rolling is 60-120 m / min. The bending roll control during rolling is characterized in that when the hot rolling machining deformation rateis 0-90%, balanced rolling is adopted by a bending roll; when the hot rolling machining deformation rate is 90%-95%, the bending roll is rolled by adopting the negative bending of 10%-20%; and when the hot rolling processing deformation rate is 95%-97%, the bending roll is rolled by adopting the negative bending of 20%-30%, and when the hot rolling machining deformation rate is 97% or above, the bending roll is rolled by adopting the negative bending of 30%-50%. According to the hot rolling production process of the aluminum foil for the electrolytic capacitor, stable production of the thick plate ingot is realized by adopting the single-machine frame four-roll reversible hot rolling unit.

Description

technical field [0001] The invention belongs to the technical field of aluminum foil processing, and in particular relates to a hot rolling production process of aluminum foil for electrolytic capacitors. Background technique [0002] With the development and progress of aluminum electrolytic capacitors, especially the promotion of new energy vehicles, the demand for high-performance aluminum electrolytic capacitors is increasing. When producing high-purity electronic aluminum foil for capacitors, with the continuous increase and thickness of the cast ingot used (increased from 200mm to 550-650mm), there will be differences between the middle structure of the rolled ingot and the upper and lower surface structures. , forming a sandwich state, the upper and lower grain sizes are small, and the grain size at the center is obviously larger, resulting in unstable performance of the produced aluminum foil for electrolytic capacitors, coarse grains, and low capacity and specific c...

AI Technical Summary

Problems solved by technology

When producing high-purity electronic aluminum foil for capacitors, with the continuous increase and thickness of the cast ingot used (increased from 200mm to 550-650mm), there will be differences between the middle structure of the rolled ingot and the upper and lower surface structures. , forming a sandwich state, the upper and lower grain sizes are small, and the grain size at the center is obviously larger, resulting in unstable performance of the produced aluminum foil for electrolytic capacitors, coarse grains, and low capacity and specific capacitance after use by customers. Poor performance problems such as large dispersion and low bending

[0003] At present, in the production process of electrolytic capacitor aluminum foil using a single-stand four-roll reversible hot rolling unit, due to rolling bite, plate shape, lubrication and other reasons, it cannot be produced with a single pass and a large processing rate, so that the internal structure after rolling appears "interlayer". "Phenomenon leads to inconsistencies in the grain structure of the aluminum foil of electrolytic capacitors, which eventually leads to unstable capacity of aluminum electrolytic capacitors

Therefore, at present, the domestic production basically adopts a plate ingot with a thickness of about 450mm and a single plate ingot weight of about 6T. This kind of plate ingot has problems of low yield and low production efficiency in the actual production process; in order to further improve production efficiency and finished products The simplest and most economical method is to increase the weight of a single slab ingot, but there are reasons such as rolling bite, plate shape, lubrication, etc., and it cannot be produced with a single-pass high processing rate

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