TW202212587A - 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 method of making the same

The present disclosure is related to a manufacturing technology of a metal alloy, and more particularly, to an aluminum alloy sheet that avoids oiling self-adhesive sheets and a manufacturing method thereof.

Aluminum-magnesium-silicon (Al-Mg-Si) alloy and aluminum-magnesium (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 automated production.

After the production of the aluminum alloy sheet is completed, the surface of the aluminum alloy sheet is usually oiled to prevent the aluminum alloy sheet from rusting and oxidizing. However, when the oiled aluminum alloy sheets are stacked and placed, the two adjacent sides of the two aluminum alloy sheets are adhered to each other due to vacuum attraction, resulting in a sticking phenomenon.

At present, in order to solve the problem of sticking aluminum alloy sheets, downstream processing plants mostly peel off the sticking aluminum alloy sheets manually, or use an air gun blowing method to peel off the sticking aluminum alloy sheets. This situation has led to the inability of aluminum 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 method for manufacturing the same, which adopts the rough rolling method in the cold rolling step of the aluminum coil, so that the surface of the formed aluminum alloy sheet has many microscopic features. Holes, which can effectively avoid the adhesion between two adjacent sides of the two aluminum alloy sheets due to vacuum attraction. Thereby, the procedure of peeling off the adhering aluminum alloy sheets can be eliminated, the application convenience of the aluminum alloy sheets can be improved, and the production cost can be reduced.

Another object 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 requirements of automatic production in production applications.

According to the above purpose of the present disclosure, a method for manufacturing an aluminum alloy sheet is proposed. In this method, aluminum billets are prepared. The aluminum billet contains 0.3 to 5.0 wt % of magnesium (Mg), 0.1 to 1.2 wt % of silicon (Si), 0.05 to 0.30 wt % of manganese (Mn), 0.05 to 0.35 wt % of iron (Fe), and a balanced amount of aluminum (Al). The aluminum billet is subjected to a hot rolling step to form a hot rolled aluminum coil. A cold rolling step is performed on the hot rolled aluminum coil to form the cold rolled aluminum coil. Performing the cold rolling step includes forming several micro-voids in the surface of the cold rolled aluminum coil. The cold rolled aluminum coil is subjected to an annealing step to form aluminum alloy sheets.

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 into aluminum to prepare an aluminum alloy raw material in a molten state; Cast molding step to produce aluminum billet.

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

According to an embodiment of the present disclosure, the preheating treatment includes placing the aluminum billet in a preheating 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 cold rolling step includes using a rolling roll, and the rolling surface roughness of the rolling roll is about 2.0 μm to about 4.0 μm.

According to an embodiment of the present disclosure, the cold rolling step includes controlling the cold rolling amount 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 the annealing step is about 300°C to about 570°C.

According to an embodiment of the present disclosure, the 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 purpose of the present disclosure, another aluminum alloy sheet is provided, 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 fabrication and application of the disclosed embodiments are discussed in detail below. It should be appreciated, however, that these embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. Therefore, the specific embodiments discussed are illustrative only, and not intended to limit the scope of the invention.

In view of the conventional methods of manual peeling or air gun blowing peeling used to solve the problem of self-adhesive sheets after oiling the 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, which starts from the source of the material, and forms many micro-holes in the surface of the aluminum alloy sheet during the delay of cold rolling, thereby effectively avoiding the phase of the aluminum alloy sheet. Adhesion occurs between adjacent surfaces due to vacuum attraction.

Please refer to FIG. 1 , which is a flowchart illustrating a method for manufacturing 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 an aluminum blank. This aluminum blank can be, for example, an aluminum magnesium alloy blank. In some embodiments, the aluminum billet may comprise primarily 0.3 to 5.0 wt % magnesium, 0.1 to 1.2 wt % silicon, 0.05 to 0.30 wt % manganese, 0.05 to 0.35 wt % of Iron, and a balanced amount of aluminum. The aluminum billet may more optionally contain other elements, for example, 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 an aluminum alloy raw material. When preparing the aluminum alloy raw material, 0.3 wt % to 5.0 wt % of magnesium, 0.1 wt % to 1.2 wt % of silicon, 0.05 wt % to 0.30 wt % of manganese, and 0.05 wt % to 0.35 wt % of iron may be melted in In the balance amount of the aluminum raw material, the aluminum alloy raw material in the molten state is prepared. Next, step 104 is performed to cast the aluminum alloy raw material. The molten aluminum alloy raw material is formed into an aluminum billet by casting.

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

After the hot rolling step is completed, step 120 may be performed to perform the cold rolling step on the hot rolled aluminum coil to form the 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 microvoids may be 50 μm to 100 μm. In some embodiments, the hot-rolled aluminum coil is cold-rolled by using a roll, wherein the roll is a rough roll, that is, the roll has a rough rolling surface, so that the hot-rolled aluminum coil is formed during the cold rolling process. Microvoids are formed in the surface.

In some illustrative examples, the rolls used for the cold rolling delay have a face roughness of about 2.0 μm to about 4.0 μm. The inventor found that if the roughness of the rolling surface of the roll is less than 2.0μm, the effect of creating micro-holes on the surface of the cold-rolled aluminum coil is not good; The one-sided quality of the rolled aluminum coil is not good. In addition, when the cold rolling step is performed, the cold rolling amount of the hot rolled aluminum coil can be controlled to be 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 to form an aluminum alloy sheet. The annealing temperature at which the annealing step is performed can be controlled, for example, to be about 300°C to about 570°C. In some exemplary examples, during the annealing step, the cold-rolled aluminum coil may be heated to the annealing temperature, and then the cold-rolled aluminum coil may be cooled to room temperature by natural cooling. After the aluminum alloy sheet is made, oil is generally applied to its surface to prevent the aluminum alloy sheet from rusting and oxidizing.

The surface roughness of the aluminum alloy sheet produced by this embodiment can be, for example, 1 μm to 2 μm. Since there are many micro-holes in the surface of the aluminum alloy sheet, when the aluminum alloy sheets are oiled and stacked on each other, when part of the protruding structures on the surfaces of the two adjacent aluminum alloy sheets are in contact with each other, 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 various examples and comparative examples to describe the technical content and effects of the embodiments of the present disclosure in more detail, but it is not intended to limit the present disclosure.

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

The alloy compositions of the experimental aluminum billets are 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 Alloy B 0.45 0.02 0.11 1.03 0.11

Using the manufacturing method of the aluminum alloy sheet disclosed above, the aluminum alloy sheet is made of the A alloy and the B alloy. In the embodiment of the present disclosure, the rolls with the roughness of the rolling surface of about 2.0 μm to about 4.0 μm are used for cold rolling, and the comparative example Then, cold-rolled rolls with surface roughness of less than 2.0 μm were selected.

The sticking conditions of the aluminum alloy sheets after being cold-rolled by rolls with different roughness are shown in Table 2 below. Table 2 Cold roll roughness (μm) One-sided roughness (μm) Oil coating amount (mg/m ² ) Number of sticky sheets 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 Alloy B 2.2 1.17 770 0 Example Alloy B 3.4 1.64 950 0 Example

It can be seen from Table 2 above that the key to avoiding the self-adhesive phenomenon of aluminum alloy sheets after oiling is to control the roughness and oiling amount of one-sided aluminum alloy sheets. 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, so the aluminum alloy sheet can allow a higher amount of oiling. The surface roughness of the aluminum alloy sheet depends on the roughness of the roll surface of the cold roll. Therefore, in the embodiment of the present disclosure, the roughness of the roll surface of the cold roll is controlled to be about 2.0 μm to about 4.0 μm so that the aluminum alloy sheet with high oiling amount can also avoid the effect of oiling self-adhesive sheet.

As can be seen from the above-mentioned embodiments, one of the advantages of the present disclosure is that the embodiment of the present disclosure adopts the rough roll 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, the adhesion between the two adjacent sides of the two aluminum alloy sheets due to vacuum attraction can be effectively avoided. Therefore, the procedure of peeling off the adhering aluminum alloy sheets can be eliminated, the application convenience of the aluminum alloy sheets can be improved, and the production cost can be reduced.

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

Although the present disclosure has been disclosed above with examples, 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 should be determined by the scope of the appended patent application.

100: Steps 102: Steps 104: Steps 110: Steps 112: Steps 114: Steps 116: Steps 120: Steps 130: Steps

In order to make the above and other objects, features, advantages and embodiments of the present disclosure more clearly understood, the accompanying drawings are described as follows: [ FIG. 1 ] is a flowchart illustrating a method for manufacturing an aluminum alloy sheet according to an embodiment of the present disclosure.

Domestic storage information (please note in the order of storage institution, date and number) none Foreign deposit information (please note in the order of deposit country, institution, date and number) none

100: Steps

102: Steps

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Claims (10)

A method for manufacturing an aluminum alloy sheet, comprising: An aluminum billet is prepared, wherein the aluminum billet comprises 0.3 wt % to 5.0 wt % magnesium, 0.1 wt % to 1.2 wt % silicon, 0.05 wt % to 0.30 wt % manganese, 0.05 wt % to 0.35 wt % Iron, and a balance of aluminum; A hot rolling step is performed on the aluminum billet to form a hot rolled aluminum coil; performing a cold rolling step on the hot rolled aluminum coil to form 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 An annealing step is performed on the cold rolled aluminum coil to form the aluminum alloy sheet. The method of claim 1, wherein preparing the aluminum billet comprises: performing a material preparation step to melt the magnesium, the silicon, the manganese, and the iron into the aluminum to prepare an aluminum alloy raw material in a molten state; and A casting forming step is performed on the aluminum alloy raw material to obtain the aluminum blank. The method of claim 1, wherein performing the hot rolling step comprises: performing a preheating treatment on the aluminum billet, wherein the temperature of the preheating treatment is 450°C to 540°C; hot rolling the aluminum billet, wherein the temperature of hot rolling the aluminum billet is 250°C to 500°C; and A coiling step is performed to obtain the hot rolled aluminum coil. The method of claim 3, wherein performing the preheating treatment comprises placing the aluminum billet in a preheated furnace at a temperature of 450°C to 540°C for at least two hours. The method of claim 1, wherein performing the cold rolling step comprises using a roll having a surface roughness of 2.0 μm to 4.0 μm. The method of claim 1, wherein performing the cold rolling step comprises controlling a cold rolling amount of 50% to 80%. The method of claim 1, wherein the size of the micro-holes is 50 μm to 100 μm. The method of claim 1, wherein one of the annealing steps is performed at an annealing temperature of 300°C to 570°C. The method of 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, produced by the method for producing an aluminum alloy sheet according to any one of claims 1 to 9, wherein a surface roughness of the aluminum alloy sheet is 1 μm to 2 μm.

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