Method for producing wide-amplitude double-zero aluminum foil blank by adopting cast-rolled compact

Abstract

The invention belongs to the technical field of aluminum alloy sheet strip foil material processing, and in particular relates to a method for producing a wide-amplitude double-zero aluminum foil blank by adopting a cast-rolled compact. By adjusting 8079, 1235 and other alloying components and adopting twice intermediate annealing processes, the non-uniform compound scale and distribution, caused by roll cooling intensity difference, of the wide-amplitude cast-rolled compact along the same board plane are eliminated, thus the pinhole degree and performances of the blank foil after rolling are superior to those of 1235; at the same time, through addition of Cu element, the problem of soft tensile property when the wide-amplitude blank is rolled to the double-zero foil after twice annealing is solved; and the rolling performance and foil rolling efficiency of the wide-amplitude blank are improved.

Description

technical field [0001] The invention belongs to the technical field of processing aluminum alloy plates, strips and foils, and in particular relates to a method for producing wide-width double-zero aluminum foil wool by using cast-rolled slabs. Background technique [0002] Aluminum foil has a wide demand in light industry, power electronics industry, packaging and other fields due to its unique properties. As a major producer of aluminum sheet, strip and foil materials, China has maintained the world's largest production capacity and output of aluminum foil since 2006. At present, China has about 140 aluminum foil production enterprises with a production capacity of 1.3 million tons per year, accounting for the world's largest aluminum foil production capacity. Since the 2008 global financial crisis, the production and sales of aluminum foil have been greatly impacted. The production capacity of domestic aluminum foil has obviously exceeded the demand. With the development...

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Problems solved by technology

[0003]The production of aluminum foil blanks generally adopts two methods: hot rolling and casting rolling. The hot rolling method is to refine and purify molten aluminum and cast it into a large flat ingot. The international production of aluminum foil with a thickness below 0.01mm basically uses hot-rolled blanks as wool. Although the aluminum foil produced by hot-rolled wool has high process stability and good product quality, the production cost is high and the one-time investment is large. The cost of aluminum foil wool produced by rolling blanks is nearly 1,000 yuan / ton higher; therefore, using cast-rolled blanks to produce aluminum foil wool instead of hot-rolled wool has become the first choice for domestic aluminum foil manufacturers; but overall, the current domestic casting-rolling production technology level The good and the bad are mixed. The cast-rolled sheet is often accompanied by defects such as inclusions, air channels, large grains, and center segregation. When the thickness is less than 0.01mm, it will lead to broken aluminum foil or excessive pinholes.

[0004] At present, the double-zero aluminum foil wool used in the domestic market is mainly 1235, 1100 and other alloys, and more than 90% of the 6~7μm aluminum foil produced in the domestic market is made of 1235 alloy , while the European and American markets are dominated by hot-rolled 8079 alloy; especially in the production market of wide-width double-zero foil wool, the use of 1235 alloy wool to produce wide-width double-zero foil has the advantages of good surface quality and fewer aluminum foil pinholes; However, due to the low alloy content and soft strength, the rolling performance is poor and the production efficiency is low; and when the 8 series alloy is used to produce wide-width double zero foil, although the strength is high and the rolling stability is good, but due to the Due to the characteristics of the alloy itself and the wide-width wool in the casting and rolling production process, due to the gradient of cooling strength along the axial direction of the casting roll, the accumulation of compounds at the grain boundaries will increase in turn, and the grain size will be inconsistent. For example, in the subsequent cold rolling production process , not eliminated in time, so that the performance is unstable during foil rolling and the strip is broken. When producing wide double-zero foil, the number of pinholes is difficult to control, and the mechanical properties such as the tensile strength are too small. At the same time, it will cause defects such as dark surface roughness.

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