TWI551692B - Method of producing aluminium alloy sheet and application thereof - Google Patents

Description

Aluminum alloy sheet manufacturing method and application thereof

The invention relates to a method for manufacturing an aluminum alloy sheet and an application thereof, in particular to a method for manufacturing an aluminum alloy sheet capable of reducing the ear rate and an application thereof.

Metal aluminum has the advantages of light weight, corrosion resistance, processing convenience, non-magnetic property and high thermal conductivity. Therefore, metal aluminum is commonly used as a shell for various electronic materials to achieve protection and heat dissipation. Among them, in order to further enhance the effect of the metal aluminum, the metal aluminum is often added to other metals to form a high-strength aluminum alloy.

The manufacturing method of the general aluminum shell can be obtained by: (1) casting by a mold, or (2) pressing step of the aluminum alloy sheet. However, compared with the latter, the former mold casting method is complicated and the production efficiency is low. Therefore, the manufacturing method of a general aluminum casing is formed by a press step.

Before the foregoing stamping step, the aluminum material is first formed into a metal aluminum sheet or an aluminum alloy sheet by a rolling step, and can be formed into a uniform thickness and a special shape. Shaped aluminum shell. However, the aluminum alloy sheets formed have different microscopic conditions depending on the crystallization conditions (for example, aluminum liquid composition) of solidification to form aluminum and the rolling parameters (for example, rolling pressure and rolling temperature) of the rolling step. Grain collection organization (Texture).

When the aluminum alloy sheet is subjected to a stamping step, the aluminum alloy sheet is subjected to the influence of the arrangement orientation of the microscopic crystal grain assembly and the strength of the aggregate structure, and the aluminum alloy sheet after the stamping has different elongation deformation amounts in all directions, so that the aluminum shell is obtained. The edge of the open end exhibits a wavy high and low undulation curve, not a perfectly sloping open end. Generally, the degree of undulation of the open end of the aluminum shell is defined by the lug rate. When the degree of fluctuation is higher, the ear rate is larger, and vice versa.

When the aluminum shell is to be further applied, the outer wall of the open end of the aluminum shell must be further cut to form a flat cut surface for the convenience of assembly and the appearance of the product. Accordingly, when the difference between the high and low undulations is larger, the outer wall of the aluminum shell must be cut more, and the manufacturing cost is increased.

In view of the above, it is not necessary to provide a method for manufacturing an aluminum alloy sheet and an application thereof to improve the defects of the conventional aluminum alloy sheet manufacturing method and its application.

Therefore, an aspect of the present invention provides a method for manufacturing an aluminum alloy sheet, which is characterized in that the ratio of the hot-rolled aggregate structure strength ratio and the annealing aggregate structure strength ratio in the manufacturing method is adjusted to make each crystal in the aluminum alloy sheet The grain structure has a relatively uniform aggregate tissue strength in all directions.

Another aspect of the present invention is to provide an aluminum alloy sheet which is obtained by the aforementioned method.

Still another aspect of the present invention is to provide an aluminum casing which is produced by subjecting the aforementioned aluminum alloy sheet to a stamping step.

According to an aspect of the present invention, a method of manufacturing an aluminum alloy sheet is proposed. This manufacturing method provides an aluminum liquid and a casting step of the aluminum liquid to form an aluminum embryo. Wherein, the aluminum liquid contains not more than 0.25 wt% of rhodium, 0.2 wt% to 0.6 wt% of iron, no more than 0.13 wt% of copper, and 0.002 wt% to 100 wt% (wt%) based on the weight of the aluminum liquid. 0.35 wt% manganese, 0.1 wt% to 0.25 wt% titanium, no more than 0.1 wt% one impurity, the impurities comprise magnesium, chromium or zinc, and the balance is aluminum.

Next, the aluminum blank is subjected to a hot rolling step to form a hot rolled aluminum material. The hot-rolled aggregate strength measurement ratio of the aluminum after hot rolling is as shown in the following formula (I), and the hot-rolled aggregate structure strength quantitative ratio is 0.10 to 1.0:

In formula (I), I _Cube represents the aggregated tissue strength of the hot-rolled aluminum in the {100}<001>direction; I _Goss represents the aggregated tissue strength of the hot-rolled aluminum in the {110}<001>direction; _Silver represents the aggregated tissue strength of hot-rolled aluminum in the {123}<634>direction; I _Copper represents the aggregated tissue strength of the hot-rolled aluminum in the {112}<111>direction; and I _Brass stands for hot-rolled aluminum Aggregate tissue strength in the {110}<112> direction.

Then, the hot rolled aluminum material is subjected to a cold rolling step to form a cold rolled aluminum sheet. Thereafter, the cold rolled aluminum sheet is subjected to an annealing step to form an aluminum alloy sheet. Wherein, the quenching set microstructure strength ratio of the aluminum alloy sheet is as shown in the following formula (II), and the annealing set tissue strength quantification ratio is 0.4 to 2.0:

In formula (II), I' _Cube represents the aggregated tissue strength of the aluminum alloy sheet in the {100}<001>direction;I' _Goss represents the aggregated tissue strength of the aluminum alloy sheet in the {110}<001>direction;' _Silver represents the aggregate strength of the aluminum alloy sheet in the {123}<634>direction;I' _Copper represents the aggregate strength of the aluminum alloy sheet in the {112}<111>direction; and I' _Brass represents the aluminum alloy sheet. Aggregate tissue strength in the {110}<112> direction.

According to an embodiment of the present invention, the finishing temperature of the hot-rolled aluminum material may be 260 ° C to 330 ° C.

According to another embodiment of the present invention, the amount of cut of the cold rolling step may be 80% to 90%.

According to still another embodiment of the present invention, the annealing temperature of the annealing step may be 270 ° C to 330 ° C.

According to still another embodiment of the present invention, the annealing time of the annealing step may be from 2 hours to 5 hours.

According to another aspect of the invention, an aluminum alloy sheet is proposed. This aluminum alloy sheet was obtained by the method described above.

According to still another aspect of the present invention, an aluminum casing is proposed. The aluminum shell is obtained by subjecting the aforementioned aluminum alloy sheet to a stamping step. Among them, the aluminum shell has a lug rate of no more than 4%.

The invention discloses a method for manufacturing an aluminum alloy sheet of the invention and an application thereof, which utilizes a quenching ratio of the hot-rolled aggregate structure strength of the hot-rolled aluminum sheet in the adjustment process and The annealing of the aluminum alloy sheet aggregates the strength of the tissue, and the grain collection in the aluminum alloy sheet has an average aggregate strength in each direction. Secondly, by pressing the prepared aluminum alloy sheet, an aluminum shell having a low ear rate can be formed.

100‧‧‧ method

110‧‧‧Steps for providing aluminum liquid

120‧‧‧Steps for casting steps

130‧‧‧Steps for the hot rolling step

140‧‧‧Steps for the cold rolling step

150‧‧‧Steps for the annealing step

160‧‧‧Steps for making aluminum alloy sheets

For a more complete understanding of the embodiments of the invention and the advantages thereof, reference should be made to the description below and the accompanying drawings. It must be emphasized that the various features are not drawn to scale and are for illustrative purposes only. The related drawings are described as follows: [Fig. 1] is a flow chart showing a method of manufacturing an aluminum alloy sheet according to an embodiment of the present invention.

The making and using of the embodiments of the invention are discussed in detail below. However, it will be appreciated that the embodiments provide many applicable inventive concepts that can be implemented in a wide variety of specific content. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

The term "tear rate" as used in the present invention means that after the step of pressing the aluminum alloy sheet, the aluminum alloy sheet can form an aluminum shell having a closed end and an open end, wherein the aluminum shell is along a direction perpendicular to the punching direction. The cross-sectional area can be round, polygonal or other shapes that meet the needs of the application.

In the aluminum shell, since the content of each crystal phase in the aluminum alloy sheet is different, and the strength of each crystal aggregate structure is different, the aluminum alloy sheet after pressing has different deformation elongation in each extending direction, and the aluminum shell is obtained. The edge of the open end exhibits a wavy high and low undulation curve. In other words, the open end of the aluminum casing is not neatly flattened. Among them, the lure rate can be calculated according to the following formula (III). When the lug rate is larger, the edge of the open end of the aluminum shell is less flat, and when the lug ratio is 0, the open end of the aluminum shell is neat and flat:

In the formula (III), D _H represents a larger value of both D ₁ and D ₂ , and D _L represents a smaller value of both D ₁ and D ₂ , wherein D ₁ and D ₂ are respectively according to the formula (III-1) and formula (III-2) are calculated. In the formula (III-1), D ₀ , D ₉₀ , D ₁₈₀ and D ₂₇₀ represent extension directions of 0, 90, 180 and 270 degrees with respect to the rolling direction of the aluminum, respectively, starting from the reference plane, The vertical elongation of the outer wall of the aluminum shell (ie, the vertical distance). In the formula (III-2), D ₄₅ , D ₁₃₅ , D ₂₂₅ and D ₃₁₅ respectively represent an extension direction of 45 degrees, 135 degrees, 225 degrees and 315 degrees with respect to the rolling direction, starting from the reference surface, the aluminum shell The vertical extent of the outer wall (ie, the vertical distance).

The aforementioned reference plane refers to a plane perpendicular to the punching direction. If the closed plane of the closed end of the aluminum shell is perpendicular to the punching direction, the closed plane may be the reference plane, and the aforementioned vertical elongation is the height of the outer wall of the aluminum shell in all directions.

Secondly, the direction of "{100}<001>" in the present invention refers to the collective organization of the Cube orientation, and the direction of extension after the stamping step is 0 degrees, 90 degrees, 180 degrees with the rolling direction of the aluminum alloy sheet. Degree and direction of 270 degrees; the direction of "{110}<001>" refers to the collective organization of Goss orientation, and the direction of extension after the stamping step is 0 degrees and 180 degrees with the rolling direction of the aluminum alloy sheet. Direction; the direction of "{110}<112>" refers to the collective organization of Brass orientation, and the direction of extension after the stamping step is 45 degrees, 135 degrees, 225 degrees and 315 degrees with the rolling direction of the aluminum alloy sheet. The direction of "{112}<111>" refers to the collective organization of the Copper orientation, and the direction of extension after the stamping step is 45 degrees, 135 degrees, 225 degrees, and 315 of the rolling direction of the aluminum alloy sheet. The direction of the degree; the direction of "{123}<634>" refers to the assembly of the Silver orientation, and the direction of the extension after the stamping step is 45 degrees, 135 degrees, 225 degrees with the rolling direction of the aluminum alloy sheet and 315 degrees direction.

Furthermore, the "Texture Intensity" described in the present invention is measured by an X-ray diffractometer and calculates an Orientation Distribution Function (ODF) value of an aluminum alloy sheet, and is quantifiable. The collective tissue strength of each grain orientation.

Please refer to FIG. 1 , which is a flow chart showing a method of manufacturing an aluminum alloy sheet according to an embodiment of the present invention. In one embodiment, the method 100 provides the aluminum liquid first and performs a casting step, as shown in steps 110 and 120. Wherein, the aluminum liquid comprises not more than 0.25 wt% of rhodium, 0.2 wt% to 0.6 wt% of iron, no more than 0.13 wt% of copper, 0.002 wt% to 0.35, based on 100 wt% (wt%) by weight of the aluminum liquid. Wt% manganese, 0.1wt% to 0.25 wt% of titanium and no more than 0.1 wt% of impurities, wherein the impurities may comprise magnesium, chromium or zinc, and the balance is aluminum.

The aluminum blank is then subjected to a hot rolling step to form a hot rolled aluminum material, as shown in step 130. Wherein, the hot rolling aggregate microstructure strength ratio of the hot rolled aluminum material is represented by the following formula (I), and the hot rolled aggregate structure strength quantification ratio may be 0.10 to 1.0:

In formula (I), I _Cube represents the aggregated tissue strength of the hot-rolled aluminum in the {100}<001>direction; I _Goss represents the aggregated tissue strength of the hot-rolled aluminum in the {110}<001>direction; _Silver represents the aggregated tissue strength of hot-rolled aluminum in the {123}<634>direction; I _Copper represents the aggregated tissue strength of the hot-rolled aluminum in the {112}<111>direction; and I _Brass stands for hot-rolled aluminum Aggregate tissue strength in the {110}<112> direction.

When the aluminum blank is subjected to the hot rolling step, the grain structure in the aluminum alloy sheet is easily recrystallized into nucleation by the high temperature of the hot rolling and the rolling action of the roller, and grows along the rolling direction. arrangement. In other words, as the temperature of the hot rolling step is higher, the aggregate strength of the grains of the aluminum alloy sheet parallel to the rolling direction (ie, the Cube and Goss orientation) increases. Among them, the rolling temperature of hot rolling, the rolling amount per pass and the rolling speed, the cooling water amount and the alloy composition of the rolling will affect the aggregate structure strength of each grain, but it is affected by the rolling force. The aggregated tissue strength of the grains parallel to the rolling direction is relatively easy to increase.

If the hot rolling aggregate microstructure strength ratio of the hot rolled aluminum material is not within the foregoing range, the aggregated tissue strength in each direction of the hot rolled aluminum material is obtained. The ratio is not optimized, and after the subsequent step of the aluminum alloy sheet produced by the stamping step, the edge of the open end of the formed aluminum shell is not flat, and has a large lug rate. Wherein, if the hot rolling aggregate structure strength ratio is greater than 1.0, the aggregate structure strength of the Cube and Goss orientation is too high, so that the aluminum alloy sheet obtained by the subsequent cold rolling step and the annealing step is easily formed by the punching step. Aluminum products with ear rate.

In an embodiment, the hot rolled aggregate tissue strength quantification ratio may preferably be from 0.13 to 0.80.

According to the requirements of the back-end application, the rolling temperature of the aforementioned hot-rolled aluminum material may be 260 ° C to 330 ° C.

After performing step 130, the hot rolled aluminum material formed as described above is subjected to a cold rolling step to form a cold rolled aluminum sheet, as shown in step 140. The cold rolling step can be cut from 80% to 90% to meet the thickness requirements of the back end application.

If the amount of the above-mentioned reduction is more than 90%, in the subsequent annealing step, the arrangement of crystal grains formed by the excessive cold rolling action is not conducive to recrystallization to form crystal aggregate structures of azimuths such as Cube and Goss. After the obtained aluminum alloy sheet is subjected to the pressing step, the elongation of the aluminum alloy sheet in various directions is different, thereby increasing the lug rate.

Then, the cold rolled aluminum sheet is subjected to an annealing step to obtain an aluminum alloy sheet, as shown in steps 150 and 160.

The annealing set microstructure strength ratio of the aluminum alloy sheet obtained by the annealing step is as shown in the following formula (II), and the annealing aggregate structure strength quantification ratio may be 0.4 to 2.0:

In the formula (II), 'on the set of {100} <001> direction on behalf of the organization _Cube strength alloy sheet; I' I _Goss representative of an aluminum alloy sheet to a {110} <001> direction of the tissue strength of the set; the I ' _Silver represents the aggregate strength of the aluminum alloy sheet in the {123}<634>direction;I' _Copper represents the aggregate strength of the aluminum alloy sheet in the {112}<111>direction; and I' _Brass represents the aluminum alloy sheet. Aggregate tissue strength in the {110}<112> direction.

When the cold rolled aluminum sheet is subjected to an annealing step, the annealing temperature of the annealing step helps to rearrange the grain structure in the cold rolled aluminum sheet. Among them, due to the influence of the rolling stress of the hot rolling step and the cold rolling step, the grain structure in the cold rolled aluminum sheet tends to be aligned to the orientation of Silver, Copper and Brass. Therefore, when the cold-rolled aluminum sheet is subjected to an appropriate annealing step, the annealing step can promote the recrystallization of an appropriate amount of crystal grains to form a collective structure of Cube and Goss orientation, and the aluminum alloy sheet obtained has a better quenching of the annealed aggregate structure strength. ratio.

If the quantification set tissue strength quantification ratio is not within the foregoing range, the aggregated tissue strength of each of the prepared aluminum alloy sheets is not uniform, and the edge of the open end of the subsequently formed aluminum shell is not flat, and thus has a comparative Big ear rate.

In an embodiment, the aforementioned annealing aggregate tissue strength quantification ratio may preferably be 0.5 to 1.3.

The annealing temperature may be from 270 ° C to 330 ° C depending on the requirements of the back end application, and the annealing time may be from 2 hours to 5 hours.

In a specific example, the grain structure in the aluminum alloy sheet obtained by the foregoing method may have a relatively uniform aggregate structure strength in all directions. In this specific example, the aluminum alloy sheet obtained by the above-mentioned aluminum alloy sheet is further subjected to a press step to obtain an aluminum shell, and the aluminum shell has a tab ratio of not more than 4%.

The following examples are used to illustrate the application of the present invention, and are not intended to limit the present invention, and various modifications and refinements can be made without departing from the spirit and scope of the invention.

Provide aluminum liquid Preparation Example 1 to Preparation Example 3

The composition of the aluminum liquids of Preparation Examples 1 to 3 is as shown in Table 1, and will not be further described herein.

Preparation of aluminum shell

The aluminum shells of Examples 1 to 5 and Comparative Examples 1 to 3 were prepared according to Table 2 below.

Example 1

First, the aluminum liquid of the above Preparation Example 1 was supplied, and the aluminum liquid was subjected to a casting step to form an aluminum embryo.

Then, the aluminum blank is subjected to a hot rolling step to form a hot rolled aluminum sheet, wherein the hot rolled aluminum sheet has a hot rolled aggregate structure strength ratio of 0.15 and a finish rolling temperature of 295 °C. Next, the hot rolled aluminum sheet is subjected to a cold rolling step to obtain a cold rolled aluminum sheet. Among them, the amount of cold-rolled aluminum sheet cut is 85% relative to the hot-rolled aluminum sheet.

The cold-rolled aluminum sheet was annealed at 300 ° C. After 4 hours, an aluminum alloy sheet was obtained, and the obtained aluminum alloy sheet was subjected to an annealing set structure strength ratio of 0.6.

Thereafter, the aluminum shell of the first embodiment is subjected to a pressing step, and the aluminum shell of the first embodiment is obtained, and the lug ratio of the obtained aluminum shell is calculated according to the above formula (III), and the result is as shown in the second The table shows.

Example 2 to Example 5 and Comparative Example 1 to Comparative Example 3

The production methods of Example 2 to Example 5 and Comparative Example 1 to Comparative Example 3 were the same as those of the aluminum shell of Example 1, except that Examples 2 to 5 and Comparative Examples 1 to 3 were changed. The composition of the aluminum liquid, the quenching ratio of the hot-rolled aggregate structure strength, and the quantification ratio of the annealing aggregate structure strength, and the conditions and evaluation results are shown in Table 2, and will not be further described herein.

Referring to Table 2, in the method for manufacturing an aluminum alloy sheet, when the ratio of the hot-rolled aggregate structure strength ratio of the hot-rolled aluminum sheet to the annealing aggregate structure strength ratio of the aluminum alloy sheet is the range disclosed in the above-mentioned case, Place The aggregate structure of the grain structure in the obtained aluminum alloy sheet is relatively average in all directions, and an aluminum shell having a tip ratio of not more than 4% can be formed after the punching step.

However, according to the comparison between Example 1 and Comparative Example 1 and Comparative Example 2, in the case of the same aluminum liquid composition, if the quantitative ratio of the hot rolled aggregate structure strength is not within the scope disclosed in the present disclosure, the obtained aluminum alloy After the stamping step, the formed aluminum shell has a lug ratio of more than 4%, and the aluminum shell outer wall has to be cut more, thereby increasing the manufacturing cost.

Accordingly, by adjusting the quantitative ratio of the hot-rolled aggregate structure strength ratio of the hot-rolled aluminum sheet to the annealing aggregate structure strength ratio of the aluminum alloy sheet, those skilled in the art can quickly judge each crystal grain set in the aluminum alloy sheet. Whether the organization is averaged in all directions, and the ear rate of the aluminum shell formed by the stamping can be judged, thereby reducing the manufacturing cost and improving the efficiency of the stamping step.

The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

100‧‧‧ method

110‧‧‧Steps for providing aluminum liquid

120‧‧‧Steps for casting steps

130‧‧‧Steps for the hot rolling step

140‧‧‧Steps for the cold rolling step

150‧‧‧Steps for the annealing step

160‧‧‧Steps for making aluminum alloy sheets

Claims (7)

A method for manufacturing an aluminum alloy sheet, comprising: providing an aluminum liquid, wherein the aluminum liquid comprises not more than 0.25 wt% 矽, 0.2 wt% to 0.6 wt%, based on the weight of the aluminum liquid: 100 wt% (wt%) Iron, no more than 0.13 wt% copper, 0.002 wt% to 0.35 wt% manganese, 0.1 wt% to 0.25 wt% titanium, no more than 0.1 wt% of one impurity, the impurity comprising magnesium, chromium or zinc, and The remaining part is aluminum; the aluminum liquid is subjected to a casting step to form an aluminum blank; and the aluminum blank is subjected to a hot rolling step to form a hot rolled aluminum material, wherein the hot rolled aluminum material is hot rolled aggregate structure The intensity quantification ratio is as shown in the following formula (I), and the hot rolling aggregate tissue strength quantification ratio is 0.10 to 1.0: In formula (I), I _Cube represents the aggregated tissue strength of the hot rolled aluminum in the {100}<001>direction; I _Goss represents the aggregated tissue strength of the hot rolled aluminum in the {110}<001> direction. I _Silver represents the aggregated tissue strength of the hot rolled aluminum in the {123}<634>direction; I _Copper represents the aggregated tissue strength of the hot rolled aluminum in the {112}<111>direction; and I _Brass represents this The aggregated strength of the hot rolled aluminum in the {110}<112>direction; a cold rolling step of the hot rolled aluminum to form a cold rolled aluminum sheet; and an annealing step of the cold rolled aluminum sheet And forming the aluminum alloy sheet, wherein the annealing composition strength quantification ratio of one of the aluminum alloy sheets is as shown in the following formula (II), and the annealing aggregate tissue strength quantification ratio is 0.4 to 2.0: In formula (II), I' _Cube represents the aggregated tissue strength of the aluminum alloy sheet in the {100}<001>direction;I' _Goss represents the aggregated tissue strength of the aluminum alloy sheet in the {110}<001> direction. I' _Silver represents the aggregated tissue strength of the aluminum alloy sheet in the {123}<634>direction;I' _Copper represents the aggregated tissue strength of the aluminum alloy sheet in the {112}<111>direction; and I' _Brass represents The aggregate strength of the aluminum alloy sheet in the {110}<112> direction. The method for producing an aluminum alloy sheet according to the first aspect of the invention, wherein the hot-rolled aluminum material has a finishing temperature of 260 ° C to 330 ° C. The method for producing an aluminum alloy sheet according to claim 1, wherein the cold rolling step is one of 80% to 90%. The method for producing an aluminum alloy sheet according to claim 1, wherein the annealing step has an annealing temperature of 270 ° C to 330 ° C. The method for producing an aluminum alloy sheet according to claim 4, wherein the annealing step has an annealing time of 2 hours to 5 hours. An aluminum alloy sheet produced by the method of any one of claims 1 to 5. An aluminum casing obtained by subjecting an aluminum alloy sheet according to claim 6 of the patent application to a stamping step, wherein the aluminum shell has a tip ratio of not more than 4%.