Process for producing high longitudinal elongation rate aluminum foil using cast-rolled aluminum foil stock

Abstract

The present application belongs to the technical field of non-ferrous metal processing, and relates to a process for producing high longitudinal elongation rate aluminum foil by using cast-rolling aluminum foil blank, comprising: selecting 8079 alloy aluminum foil blank, the blank being prepared by cast-rolling method, and the components of the blank being Si: 0.05-0.08%; Fe: 1.0-1.2%, and the rest being constant; rolling the blank in four passes, the four passes being divided into two passes of blooming, one pass of medium rolling, and one pass of finishing rolling; wherein, the roughness of the rolling rolls used in the passes of blooming, medium rolling and finishing rolling is 0.28-0.32, 0.11-0.12 and 0.06-0.08 respectively, the rolling oil temperature during the four passes of rolling is greater than or equal to 60 DEG C; slitting and annealing. The present application increases the temperature of the deformation zone by increasing the rolling oil temperature, so that the work hardening of the grain morphology of the aluminum foil during the rolling process is slowed down, the problem of low longitudinal elongation rate of the aluminum foil produced by the cast-rolling material for a long time is solved, the cast-rolling blank is effectively used to replace the hot-rolling blank to produce high-grade aluminum foil, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of non-ferrous metal processing, and relates to rolling of aluminum foil, in particular to a process for producing high longitudinal elongation rate aluminum foil using cast-rolled aluminum foil blank. BACKGROUND

[0002] Aluminum foil is a heat transfer material made of aluminum directly rolled into a thin sheet. Its heat transfer effect is similar to that of pure silver foil, so it is also called fake silver foil. Because of the soft texture and good ductility of aluminum, it has a silver-white luster. Aluminum foil is mainly used in green packaging, household, household appliances, electronic communication, transportation, printing, chemical industry, building materials, decoration and other industries, and is an important industrial raw material.

[0003] There are mainly two kinds of existing aluminum foil blanks: hot-rolled blanks and cast-rolled blanks. Hot-rolled blanks are usually of good quality and suitable for high-quality double-zero aluminum foil and deep-processed aluminum foil products. In particular, in terms of elongation rate, the aluminum foil produced from hot-rolled blanks has significantly improved internal organization uniformity and grain size after multiple recovery and recrystallization, and the aluminum foil produced has a high elongation rate. The manufacturing equipment of cast-rolled blanks is simple, the total investment is small, the production cycle is short, and the milling, homogenization, hot rolling and other complicated processing procedures in the production process of hot-rolled blanks are omitted, so the cost of producing aluminum foil blanks by cast-rolling method is greatly reduced. However, due to the different cooling methods and hot working conditions in the process of producing blank plates by cast-rolling method, the internal organization of cast-rolled blank plates mainly has defects such as segregation, uneven organization and coarse grain organization after annealing, and the quality control is more difficult, so the use of cast-rolled blanks in high-quality aluminum foil products is relatively less. The main problem is that the longitudinal elongation rate of the finished aluminum foil is relatively low.

[0004] At present, the process of applying cast-rolled blanks to aluminum foil production is gradually mature, and more and more enterprises begin to use cast-rolling process to produce aluminum foil, and cast-rolling becomes the mainstream of aluminum foil front process. However, in high-grade aluminum foil, cast-rolled blanks cannot completely replace hot-rolled blanks due to their low elongation rate.

[0005] In the previous research, the applicant found that in the heating stage of the annealing process, the temperature is raised from room temperature to 210℃, and the heating time is 10h; in the high-temperature holding stage, the temperature is held at 210℃ for 50-90h, and the furnace is discharged and covered with cloth for external furnace insulation within 30 minutes, and then cooled to room temperature. The use of external furnace insulation improves the efficiency of the annealing furnace, which is beneficial to improve the elongation rate, as described in detail in CN110484782A. Further, on the basis of using low-silicon high-iron cast-rolled blanks, the applicant improves the temperature of the deformation zone by increasing the temperature of the rolling oil, so that the work hardening of the grain morphology of the aluminum foil during rolling is slowed down, thereby improving the longitudinal elongation rate of the finished aluminum foil, and at the same time, the use of roughness lower rollers reduces the high rolling speed caused by temperature rise, so that the rolling process is controllable. SUMMARY

[0006] In view of the above-mentioned deficiencies in the prior art, the present application aims to provide a process for producing high longitudinal elongation rate aluminum foil using cast-rolled aluminum foil blank, which can effectively improve the longitudinal elongation rate of the aluminum foil, replace the aluminum foil produced by hot-rolled blank, and reduce the production cost.

[0007] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0008] A process for producing high longitudinal elongation rate aluminum foil using cast-rolled aluminum foil blank, comprising the following steps:

[0009] 1) selecting 8079 alloy aluminum foil blank, which is prepared by cast-rolling method, and the composition of the blank comprises Si: 0.05-0.08%; Fe: 1.0-1.2%, and the remaining components are constant;

[0010] 2) rolling the blank in four passes, the four passes are divided into two passes of blooming, one pass of medium rolling, and one pass of finishing rolling; wherein,

[0011] the blooming pass, the medium rolling pass and the finishing rolling pass respectively use rollers with roughness of 0.28-0.32, 0.11-0.12 and 0.06-0.08,

[0012] the rolling oil temperature is ≥60℃ during the four passes of rolling;

[0013] 3) slitting and annealing.

[0014] In the preferred disclosure of the present application, before the four passes of step 2) start production, the rollers are pulled by using ordinary material rolls, and the pulling rolling time is at least 30 min, so as to increase the roller temperature and prevent the rolling oil temperature from being cooled by the rollers.

[0015] Further, the pulling rolling time is 45 min.

[0016] In the preferred disclosure of the present application, the rolling oil temperature during rolling is increased to 65-72℃ in step 2), so as to increase the deformation zone temperature during rolling.

[0017] After increasing the rolling oil temperature, the rolling speed needs to be controlled to ensure the aluminum foil shape and pinhole and other indicators, and rollers with lower roughness are used.

[0018] In the preferred disclosure of the present application, the slitting process in step 3) cuts the aluminum foil according to the width required by the customer.

[0019] In the preferable disclosure of the present application, in the annealing process in step 3), the temperature rising stage is from room temperature to 210 DEG C, and the temperature rising time is 10 hours; the high-temperature holding stage is holding at 210 DEG C, and the holding time is 50-80 hours; after the holding time, the furnace is directly discharged and the furnace is covered with cloth for external heat preservation within 30 minutes, and then the temperature is cooled to room temperature.

[0020] The present application can ensure that the plate shape and pinhole of the aluminum foil meet the requirements, and can maximize the improvement of the longitudinal elongation of the aluminum foil, thereby providing high-quality aluminum foil with high quality for the market.

[0021] Beneficial effects

[0022] The present application can improve the temperature of the deformation zone by improving the temperature of the rolling oil, thereby slowing down the work hardening of the grain morphology of the aluminum foil during the rolling process, improving the longitudinal elongation of the finished aluminum foil, effectively using the cast-rolling blank to replace the hot-rolled blank to produce high-grade aluminum foil, and reducing the production cost. In the current situation of difficult procurement of hot-rolled blanks, the delivery rate of high-grade aluminum foil orders is improved, which is of great significance to enhance the reputation and competitiveness of enterprises. DETAILED DESCRIPTION

[0023] The present application will be described in detail below with reference to the embodiments, so that those skilled in the art can better understand the present application, but the present application is not limited to the following embodiments.

[0024] Embodiments

[0025] According to the process parameters disclosed in the present application, the blank with a thickness of 0.26 mm is rolled, and the specific blank composition and process parameters are as follows:

[0026]

[0027] After rolling, it is verified that the number of pinholes and the plate shape are normal, and the tensile testing machine test shows that the elongation of 0.009*1000 is 3.2%, and the elongation of 0.007*1000 is 2.6%. Compared with the elongation of ordinary cast-rolling aluminum foil, the elongation of 0.007 thickness is generally 1.5-2.5%, and the elongation of 0.009 thickness is generally 2.0-3.5%, which is obviously improved.

[0028] Comparative example

[0029] The intermediate rolling and finishing rolling roller crowning and target plate shape curve are not rolled according to the process parameters disclosed in the present application, and the process parameters are as follows:

[0030]

[0031] After rolling, the results are as follows:

[0032]

[0033] Through the analysis of the product conditions of the aluminum foil rolled under different components and process parameters by the above examples, it is proved that the method for producing high longitudinal elongation rate aluminum foil using cast-rolled aluminum plate disclosed by the present application can effectively solve the problem of low longitudinal elongation rate of the cast-rolled aluminum plate, and can use the cast-rolled aluminum plate to replace the hot-rolled aluminum plate to produce high-grade aluminum foil, thereby reducing the production cost of the enterprise.

[0034] The above only describes the embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation made by the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application. Although the present application has been described herein with reference to specific aspects, features and exemplary embodiments of the present application, it should be understood that the use of the present application is not limited thereto, but extends and covers numerous other variations, modifications and alternative embodiments, as suggested to those skilled in the art based on the disclosure herein. Accordingly, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A process for producing high longitudinal elongation rate aluminum foil using cast-rolled aluminum foil stock, characterized by, It comprises the following steps: 1) selecting 8079 alloy aluminum foil blank, which is made by casting-rolling method, and the composition of the blank is as follows: Si: 0.05-0.08%; Fe: 1.0-1.2%, and the rest is constant; 2) before starting production in four passes, the roll is drawn by using common material roll, and the drawing rolling time is at least 30 min; the blank is rolled in four passes, which are divided into two open passes, one intermediate rolling pass and one finishing rolling pass; wherein, the roughness of the rolls used in the open pass, the intermediate rolling pass and the finishing rolling pass is 0.28-0.32, 0.11-0.12 and 0.06-0.08 respectively; the rolling oil temperature during the four passes is 65-72℃; 3) slitting and annealing.

2. The process for producing high longitudinal elongation rate aluminum foil using a cast-rolled aluminum foil blank according to claim 1, characterized by: In step 2), the drawing rolling time is 45 min.

3. The process for producing high longitudinal elongation rate aluminum foil using a cast-rolled aluminum foil blank according to claim 1, characterized in that: In step 3), the slitting process, the aluminum foil is slit according to the width required by the customer.

4. The process for producing high machine direction elongation rate aluminum foil using cast-rolled aluminum foil stock material according to claim 1, characterized in that: In step 3), the annealing process, in the heating stage, the temperature is raised from room temperature to 210℃, and the heating time is 10 h; in the high-temperature holding stage, the holding is carried out at 210℃, and the holding time is 50-80 h; after the holding time is reached, the furnace is directly discharged and covered with cloth for out-of-furnace holding within 30 min, and then cooled to room temperature.

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