TWI733592B - Aluminum alloy sheet and method for manufacturing the same - Google Patents

Abstract

An aluminum alloy sheet and a method for manufacturing the same are described. In this method, an aluminum billet is prepared. The aluminum billet includes magnesium (Mg) with a weight percentage from 0.3% to 5.0%, silicon (Si) with a weight percentage from 0.1% to 1.2%, manganese (Mn) with a weight percentage from 0.05% to 0.30%, iron (Fe) with a weight percentage from 0.05% to 0.35%, and balance aluminum (Al). A hot rolling step is performed on the aluminum billet to form a hot-rolling aluminum coil. A cold rolling step is performed on the hot-rolling aluminum coil to form a cold-rolling aluminum coil. Performing the cold rolling step includes forming various micro holes in surfaces of the cold-rolling aluminum coil. An annealing step is performed on the cold-rolling aluminum coil to form an aluminum alloy sheet.

Description

Aluminum alloy sheet and manufacturing method thereof

The present disclosure relates to a manufacturing technology of a metal alloy, and particularly relates to an aluminum alloy sheet and a manufacturing method thereof that avoid oiling a self-adhesive sheet.

Aluminum-Mg-Si (Al-Mg-Si) alloy and Al-Mg (Al-Mg) alloy are the two main aluminum materials for automobiles. In addition to certain requirements for the basic mechanical properties of aluminum-magnesium-silicon alloys and aluminum-magnesium alloys, these two aluminum materials are also required to have the requirements for automatic production.

After the production of the aluminum alloy sheet is completed, the surface of the aluminum alloy sheet is usually oil-coated to prevent the aluminum alloy sheet from rusting and oxidation. However, when the oiled aluminum alloy sheets are stacked and placed, the two adjacent surfaces of the two aluminum alloy sheets adhere to each other due to vacuum suction, resulting in a sticky sheet phenomenon.

At present, in order to solve the sticking problem of aluminum alloy sheets, downstream processing plants mostly manually peel off the adhered aluminum alloy sheets, or use air gun blowing to peel off the adhered aluminum alloy sheets. However, this situation has led to the inability of aluminum materials to meet the requirements of automated production in production applications.

Therefore, one of the objectives of the present disclosure is to provide an aluminum alloy sheet and a manufacturing method thereof, which adopts a rough rolling method in the cold rolling step of aluminum coil material, so that the surface of the formed aluminum alloy sheet has many microstructures. Holes, which can effectively avoid adhesion between two adjacent surfaces of the two aluminum alloy sheets due to vacuum attraction. Thereby, the procedure of peeling off the adhered aluminum alloy sheet can be avoided, and the application convenience of the aluminum alloy sheet can be improved, and the production cost can be reduced.

Another purpose of the present disclosure is to provide an aluminum alloy sheet and a manufacturing method thereof, which can effectively solve the problem of sticking of the aluminum alloy sheet, so that the aluminum alloy sheet can meet the demand for automated production in production applications.

According to the above objective of the present disclosure, a method for manufacturing an aluminum alloy sheet is proposed. In this method, aluminum blanks are prepared. The aluminum blank contains 0.3wt% to 5.0wt% of magnesium (Mg), 0.1wt% to 1.2wt% of silicon (Si), 0.05wt% to 0.30wt% of manganese (Mn), 0.05wt% to 0.35wt% The iron (Fe) and the balance of aluminum (Al). The aluminum blank is subjected to a hot rolling step to form a hot rolled aluminum coil. The hot-rolled aluminum coil is subjected to a cold rolling step to form a cold-rolled aluminum coil. The cold-rolling step includes forming a number of micro-holes in the surface of the cold-rolled aluminum coil. The cold-rolled aluminum coil is subjected to an annealing step to form an aluminum alloy sheet.

According to an embodiment of the present disclosure, the above-mentioned preparation of aluminum blanks includes a material preparation step to melt magnesium, silicon, manganese, and iron in aluminum to prepare aluminum alloy raw materials in a molten state; and performing the aluminum alloy raw materials Casting and forming steps to obtain aluminum blanks.

According to an embodiment of the present disclosure, the above-mentioned hot rolling step includes preheating the aluminum blank, wherein the temperature of the preheating is about 450°C to about 540°C; hot rolling the aluminum blank, wherein The temperature of the aluminum blank is about 250°C to about 500°C; and the coiling step is performed to obtain the hot-rolled aluminum coil.

According to an embodiment of the present disclosure, the above-mentioned pre-heat treatment includes placing the aluminum blank in a pre-heating furnace at a temperature of about 450° C. to about 540° C. for at least two hours.

According to an embodiment of the present disclosure, the above-mentioned cold rolling step includes using a roller, and the surface roughness of the roller is about 2.0 μm to about 4.0 μm.

According to an embodiment of the present disclosure, the aforementioned step of performing cold rolling includes controlling the amount of cold rolling to be about 50% to about 80%.

According to an embodiment of the present disclosure, the size of the above-mentioned micro-holes is 50 μm to 100 μm.

According to an embodiment of the present disclosure, the annealing temperature for performing the annealing step is about 300°C to about 570°C.

According to an embodiment of the present disclosure, the above annealing step includes heating the cold-rolled aluminum coil to an annealing temperature, and then cooling the cold-rolled aluminum coil to room temperature.

According to the above-mentioned objective of the present disclosure, another aluminum alloy sheet is proposed, which is produced by the above-mentioned manufacturing method of the aluminum alloy sheet, wherein the surface roughness of the aluminum alloy sheet is 1 μm to 2 μm.

The manufacturing and application of the embodiments of the disclosure are discussed in detail below. However, it can be understood that these embodiments provide many applicable inventive concepts, which can be implemented in various specific contents. Therefore, the specific embodiments discussed are for illustration only, and are not intended to limit the scope of the present invention.

In view of the conventional manual peeling or air gun blowing peeling method used to solve the problem of self-adhesive sheets after oiling aluminum alloy sheets, the aluminum alloy sheets cannot meet the needs of automated production in production applications. Therefore, the present disclosure proposes an aluminum alloy sheet and a manufacturing method thereof. It starts from the source of the material and causes many micro-holes to be formed in the surface of the aluminum alloy sheet during the cold rolling delay, thereby effectively avoiding the phase of the aluminum alloy sheet Adhesive sheeting occurs due to vacuum attraction between adjacent surfaces.

Please refer to FIG. 1, which is a flowchart of a manufacturing method of an aluminum alloy sheet according to an embodiment of the present disclosure. In this embodiment, when the aluminum alloy sheet is manufactured, step 100 may be performed first to prepare aluminum blanks. The aluminum blank can be, for example, an aluminum-magnesium alloy blank. In some embodiments, the aluminum blank may mainly include 0.3wt% to 5.0wt% magnesium, 0.1wt% to 1.2wt% silicon, 0.05wt% to 0.30wt% manganese, 0.05wt% to 0.35wt% Iron, and the balance of aluminum. The aluminum blank may further optionally contain other elements, for example, it may contain about 0.02 wt% copper.

In some exemplary examples, when the aluminum blank is prepared in step 100, step 102 may be performed first to prepare aluminum alloy raw materials. When preparing aluminum alloy raw materials, 0.3wt% to 5.0wt% of magnesium, 0.1wt% to 1.2wt% of silicon, 0.05wt% to 0.30wt% of manganese, and 0.05wt% to 0.35wt% of iron can be melted in In the balanced amount of aluminum raw materials, an aluminum alloy raw material in a molten state is prepared. Then, step 104 is performed to cast the aluminum alloy raw material. The aluminum alloy raw material in the molten state is molded into an aluminum blank through casting.

After the aluminum blank is produced, step 110 may be performed to hot-roll the aluminum blank to obtain a hot-rolled aluminum coil. In some exemplary examples, if the aluminum blank is to be hot-rolled for a delay time, step 112 may be performed first to pre-heat the aluminum blank. The temperature of the pre-heat treatment can be 450°C to 540°C. For example, when the aluminum blank is preheated, the aluminum blank can be placed in a preheating furnace at a temperature of 450° C. to 540° C. and kept for at least two hours. Then, step 114 may be performed to roll the preheated aluminum blank by a hot rolling mill. In the process of hot rolling the aluminum blank, the temperature can be controlled at 250°C to 500°C, for example. Subsequently, step 116 may be performed to coil the aluminum sheet formed by the hot rolling of the aluminum blank to obtain a hot-rolled aluminum coil.

After the hot-rolling step is completed, step 120 may be performed to perform a cold-rolling step on the hot-rolled aluminum coil to form a cold-rolled aluminum coil. Before the cold rolling step, the temperature of the hot-rolled aluminum coil can be lowered to room temperature before proceeding. In this embodiment, when the hot-rolled aluminum coil is cold-rolled, many micro-holes are formed in the two surfaces of the cold-rolled aluminum coil. For example, the size of these micro-holes can be 50 μm to 100 μm. In some embodiments, a roll is used to cold-roll the hot-rolled aluminum coil, wherein the roll is a rough-rolled roll, that is, the roll has a rough rolling surface, so that the hot-rolled aluminum coil is hardened during the cold rolling process. Micro-holes are formed in the surface.

In some exemplary examples, the rolling surface roughness of the roll used for the cold rolling delay is about 2.0 μm to about 4.0 μm. The inventor found that if the surface roughness of the roll is less than 2.0μm, the effect of making microvoids on the surface of the cold-rolled aluminum coil is not good; and if the surface roughness of the roll is greater than 4.0μm, it will result in cold rolling. The one-sided quality of rolled aluminum coil is poor. In addition, when the cold rolling step is performed, the cold rolling amount of the hot-rolled aluminum coil can be controlled at about 50% to about 80%, for example.

After the cold-rolling step is completed, step 130 may be performed to anneal the cold-rolled aluminum coil material to form an aluminum alloy sheet. The annealing temperature for performing the annealing step can be controlled at about 300°C to about 570°C, for example. In some demonstration examples, during the annealing step, the cold-rolled aluminum coil can be heated to this annealing temperature, and then the cold-rolled aluminum coil can be cooled to room temperature by natural cooling. After the aluminum alloy sheet is made, oil is generally applied to the surface to prevent the aluminum alloy sheet from rusting and oxidation.

The surface roughness of the aluminum alloy sheet prepared by this embodiment may be, for example, 1 μm to 2 μm. Because there are many micro-holes in the surface of the aluminum alloy sheet, when the aluminum alloy sheets are stacked on each other after being coated with oil, when the protruding structures on the surfaces of two adjacent aluminum alloy sheets are in contact with each other, the The oil can flow into the micro-holes, thereby preventing adjacent aluminum alloy sheets from sticking to each other.

The following uses the experimental results of a number of embodiments and comparative examples to more specifically describe the technical content and effects of the embodiments of the present disclosure, but they are not intended to limit the present disclosure.

In the two experimental aluminum blank materials, the alloy composition of A alloy is 4.5wt% of magnesium, 0.20wt% of iron, 0.15wt% of silicon, 0.25wt% of manganese, and 0.02wt% of copper. , The rest is aluminum content. The alloy composition of B alloy is 0.45wt% of magnesium, 0.11wt% of iron, 1.03wt% of silicon, 0.11wt% of manganese, 0.02wt% of copper, and the rest of aluminum.

The alloy composition of the experimental aluminum blanks is listed in Table 1 below. Table 1 Material Magnesium (wt%) Copper (wt%) Manganese (wt%) Silicon (wt%) Iron (wt%) A alloy 4.5 0.02 0.25 0.15 0.20 B alloy 0.45 0.02 0.11 1.03 0.11

The aluminum alloy sheet is manufactured using the aluminum alloy sheet disclosed above, and the aluminum alloy sheet is made of alloy A and alloy B. In the embodiment of the disclosure, a roll with a rolling surface roughness of about 2.0 μm to about 4.0 μm is used for cold rolling. Comparative example Then, rolls with a rolling surface roughness less than 2.0 μm are used for cold rolling.

The bonding conditions of the aluminum alloy sheets after cold rolling with rolls of different roughness are shown in Table 2 below. Table 2 Cold roll roughness (μm) One-sided roughness (μm) Oil amount (mg/m ² ) Number of stickies Remark A alloy 0.6 0.27 650 8 Comparative example A alloy 1.7 0.83 650 0 Comparative example A alloy 1.7 0.81 810 4 Comparative example A alloy 2.2 1.08 950 0 Example B alloy 2.2 1.17 770 0 Example B alloy 3.4 1.64 950 0 Example

It can be seen from Table 2 above that the key to avoiding the self-adhesive sheet phenomenon after the aluminum alloy sheet is coated with oil is to control the surface roughness and the amount of oil applied to the aluminum alloy sheet. The higher the surface roughness of the aluminum alloy sheet, the greater the number of micro-holes on the surface of the aluminum alloy sheet and the deeper the depth. Therefore, the aluminum alloy sheet can tolerate a higher amount of oil coating. The surface roughness of the aluminum alloy sheet depends on the roughness of the cold roll surface. Therefore, the embodiment of the present disclosure is to make the aluminum alloy sheet with high oil content also have the effect of avoiding the oil-coated self-adhesive sheet, and control the roughness of the cold roll surface to be about 2.0 μm to about 4.0 μm.

It can be seen from the above-mentioned embodiments that one of the advantages of the present disclosure is that the embodiment of the present disclosure adopts a rough rolling method in the cold rolling step of the aluminum coil, so that the surface of the formed aluminum alloy sheet has many micropores. Hole. With these micro-holes, it is possible to effectively avoid adhesion between two adjacent surfaces of the two aluminum alloy sheets due to vacuum attraction. Therefore, the procedure of peeling off the adhered aluminum alloy sheet can be eliminated, and the application convenience of the aluminum alloy sheet can be improved, thereby reducing the production cost.

As can be seen from the above-mentioned embodiments, another advantage of the present disclosure is that the present disclosure can effectively solve the sticking problem of the aluminum alloy sheet, so the aluminum alloy sheet can meet the demand for automated production in production applications.

Although the present disclosure has been disclosed in the above embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of this disclosure shall be subject to the scope of the attached patent application.

100: steps 102: Step 104: Step 110: Step 112: Step 114: step 116: step 120: Step 130: steps

In order to make the above and other objectives, features, advantages and embodiments of the present disclosure more obvious and understandable, the description of the accompanying drawings is as follows: [Fig. 1] is a flowchart showing a manufacturing method of an aluminum alloy sheet according to an embodiment of the present disclosure.

Domestic deposit information (please note in the order of deposit institution, date and number) no Foreign hosting information (please note in the order of hosting country, institution, date, and number) no

100: steps

102: Step

104: Step

110: Step

112: Step

114: step

116: step

120: Step

130: steps

Claims (10)

A method for manufacturing an aluminum alloy sheet, comprising: preparing an aluminum blank, wherein the aluminum blank contains 0.3wt% to 5.0wt% magnesium, 0.1wt% to 1.2wt% silicon, and 0.05wt% to 0.30wt% Manganese, 0.05wt% to 0.35wt% iron, and a balance of aluminum; a hot rolling step is performed on the aluminum blank to form a hot-rolled aluminum coil; the hot-rolled aluminum coil is cold-rolled A step of forming a cold-rolled aluminum coil, wherein performing the cold-rolling step includes forming a plurality of micro-holes in a plurality of surfaces of the cold-rolled aluminum coil; and performing an annealing step on the cold-rolled aluminum coil , To form the aluminum alloy sheet. The method according to claim 1, wherein preparing the aluminum blank comprises: performing a material preparation step to melt the magnesium, the silicon, the manganese, and the iron in the aluminum to prepare a molten state An aluminum alloy raw material; and a casting molding step is performed on the aluminum alloy raw material to obtain the aluminum blank. The method according to claim 1, wherein performing the hot rolling step comprises: performing a preheat treatment on the aluminum blank, wherein the temperature of the preheat treatment is 450°C to 540°C; and hot rolling the aluminum blank , The temperature of hot rolling the aluminum blank is 250℃ To 500°C; and perform a coiling step to obtain the hot-rolled aluminum coil material. The method according to claim 3, wherein performing the preheat treatment comprises placing the aluminum blank in a preheating furnace at a temperature of 450°C to 540°C for at least two hours. The method according to claim 1, wherein performing the cold rolling step includes using a roll, one of which has a rolling surface roughness of 2.0 μm to 4.0 μm. The method according to claim 1, wherein performing the cold rolling step includes controlling a cold rolling amount of 50% to 80%. The method according to claim 1, wherein the size of the micro-holes is 50 μm to 100 μm. The method according to claim 1, wherein one of the annealing steps is performed at an annealing temperature of 300°C to 570°C. The method according to claim 8, wherein performing the annealing step comprises heating the cold-rolled aluminum coil to the annealing temperature, and then cooling the cold-rolled aluminum coil to room temperature. An aluminum alloy sheet manufactured by the method for manufacturing an aluminum alloy sheet according to any one of claims 1 to 9, wherein the aluminum alloy sheet has two rolled surfaces, and each of the rolled surfaces has one side roughness It is 1μm to 2μm.

Images