JPH0225546A - Manufacture of rolled aluminum-alloy sheet for blind - Google Patents

Abstract

PURPOSE:To make a blind made of Al alloy lightweight by continuously casting an Al alloy containing specific weight percentages of Mg, Mn and Fe at a specific cooling velocity to form the above Al alloy into a metal plate of specific thickness and then subjecting this metal plate to cold rolling at a specific draft. CONSTITUTION:An Al alloy having a composition containing, by weight, 0.4-2.0% Mg, 0.1-2.5% Mn, and 0.1-2.5% Fe is cast continuously at <=50 deg.C/sec cooling rate so as to be formed into a continuously cast metal plate of 3-15mm thickness, which is then cold-rolled at >=60% draft. At this time, cold rolling may be carried out at >=50% draft after the addition of Cu and Zn to the alloy. Moreover, after a primary cold rolling, intermediate heat treatment and a secondary cold rolling are carried out. By this method, the blind made of Al alloy can be made lightweight.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for manufacturing rolled aluminum alloy sheets for blinds, and more particularly, relates to a method for manufacturing rolled aluminum alloy sheets for blinds that have excellent strength after painting and baking. It is something.

BACKGROUND OF THE INVENTION Blinds provided on windows in various buildings for sunlight control or blindfolding are usually made of thin sheets of steel, aluminum, plastic, or the like. Among these, aluminum materials are especially important! It is suitable for brands because it is small in quantity and non-flammable.

By the way, as a conventional aluminum alloy for blinds, A! -4,5% Mq1 alloy JIS 5083
The old material 8 of the alloy or the old material 8 of the JIS 5086 alloy, which is an Aβ-4.0%fVIQ-based alloy, is used.
In that case, the root bank is said to be about 0.1 to 0.3M.

Problems to be Solved by the Invention In the SI manufacturing process of blinds using rolled aluminum alloy plates, it is generally necessary to perform paint baking treatment, but conventional JIS 5083 alloy H alloy materials and JIS
With 5086 Alloy H alloy materials, there is a problem that paint baking reduces strength during the process. For this reason, blinds made from conventional materials have no choice but to be thickened to compensate for their strength.
The reality is that this has resulted in a loss of quality and increased costs. Paint baking can also be considered to increase the rolling rate of the final cold rolling in the manufacturing process of rolled aluminum alloy sheets for blinds in order to increase the strength afterward, but in this case, the rolling properties will be extremely poor, causing operational troubles. (There is a problem that it may lead to unnecessary costs and high costs.

This invention was made against the background of the above-mentioned circumstances, and was designed to produce aluminum and miniram alloy rolled plates for blinds that have excellent strength after baking without impairing rollability. The purpose is to provide a method that allows for

Means for Solving the Problems In order to achieve the above-mentioned object, the present inventors conducted extensive experiments and experiments on a method for manufacturing rolled aluminum alloy sheets for blinds.
As a result of extensive research, we discovered that by appropriately adjusting the composition of the alloy and at the same time increasing the cooling rate during rolling during the manufacturing process, it was possible to achieve superior strength after paint baking without impairing rollability. , this invention was made. Furthermore, we have found that by increasing the cooling rate during casting as described above and at the same time performing rapid heating and rapid cooling during the intermediate heat treatment during the cold rolling process, it is possible to further improve the strength after paint baking.

Therefore, the method for manufacturing an aluminum alloy rolled plate for blinds according to the invention of claim 1 of the present application is such that the M20.4 to 2.0%
An alloy containing 0.1 to 2.5% Mn, 0.1 to 2.5% Fe, and the balance consisting of octaβ and unavoidable impurities is continuously cast at a cooling rate of 50°C/sec or more to form a plate. It is characterized by continuously casting plates having a thickness of 3 to 15M, and then cold rolling the continuous blank at a rolling rate of 60% or more.

Further, the method for manufacturing an aluminum alloy rolled plate for blinds according to the invention of claim ¥42 includes M (Jo, 4 to 2.0%).

Contains 0.1-2.5% Mn, 0.1-2.5% Fe, and 0.05-1.0% Cu, Zn
An alloy containing 0.1 to 1.0% of 1 type or 2M, with the balance consisting of 8β and unavoidable impurities, is continuously cast at a cooling rate of 50°C/% or more to form a plate with a thickness of 3 to 15%. The continuous cast plate is then cold rolled at a rolling reduction of 50% or more.

The method for producing a rolled aluminum alloy plate for blinds according to the third aspect of the present invention has a MC of 70-4 to 2.0%.

Mn 0.1-2.5%, Fe 0.1-2.5%
An alloy containing aluminum with the remainder consisting of Al and unavoidable impurities is continuously cast at a cooling rate of 50°C/E or higher to form a continuous cast plate with a thickness of 3 to 15 iay, and then the continuous cast plate is subjected to primary cooling. After inter-rolling, the temperature is raised to a temperature within the range of 400 to 620°C at a heating rate of 10°C/CX or more, and immediately or after holding at that temperature at a rate of 120 or less.
Performing an intermediate heat treatment in which the material is cooled at a cooling rate of 0° C./% or more, followed by secondary cold rolling once or twice or more,
Moreover, the final secondary cold rolling is performed at a rolling reduction of 60% or more.

Furthermore, the method for producing a rolled aluminum alloy plate for blinds according to the invention of claim 4 includes Mq O 14 to 2.0%,
Contains Mn 0.1-2.5%, Fe 0.1-2.5%, Cu 0.05-1.0%, Zn 0.1
An alloy containing ~1.0% of one or two types, with the remainder consisting of 8β and unavoidable impurities, is continuously cast at a cooling rate of 50°C/m or more to form a continuous sheet with a thickness of 3 to 15 seconds. Bonds that are made into plates and then subjected to primary cold rolling on the continuously cast plates,
Raise the temperature to a temperature within the range of 400 to 620°C at a heating rate of 10°C/sec or more and immediately or at that temperature for 120 seconds.
An intermediate heat treatment of cooling at a cooling rate of 10° C./rich or higher after being maintained at ec or less, followed by two water-cooled dark rollings is performed once or twice or more, and a secondary cold rolling at the end of R is performed. It is characterized in that it is carried out at a rolling ratio of 50% or more.

Function: The elements added to the material in the method for manufacturing rolled aluminum alloy sheets for blinds according to the inventions of the present application are mainly added to increase the strength of the aluminum material and to suppress softening during paint baking. First, the reason for limiting the components in the invention of claim 1 and the invention of claim 3 will be explained.

Mg: Mq is an element that forms a solid solution in the aluminum matrix and is effective in improving work hardening properties.

However, in the case of the method of this invention, the cold fJ3 speed during manufacturing is increased to force the other components, especially l"e, into solid solution, so each of them synergistically reduces work hardening. Since the elements of Mg become effective, there is no need to add as much as 4% as in the case of normal DC casting.Here, if the amount of Mg added is less than 0.4%, cold rolling of 90% or more is performed. However, it is difficult to obtain sufficient strength after the paint baking required for blinds.On the other hand, if the amount of M9 added exceeds 2.0%, the strength will become too high during cold rolling, resulting in loss of rollability. , Naware,
Edge cracking is likely to occur during cold rolling, resulting in lower yield and operational problems. Therefore, the amount of Ma added was set within the range of 0.4 to 2.0%.

Mn: Mn is an element that contributes to improving strength and is effective in suppressing decrease in strength during paint baking.

Particularly in the blind material used in this invention, the effect of adding Mn is important. Added amount of Mn is 0.1%
If it is less than 2.5%, the above effect cannot be obtained, and if it exceeds 2.5%, the cold rollability will decrease to the edge, so the amount of Mn added was set within the range of 0.1 to 2.5%. .

Fe: Fe is an extremely effective element that is forcibly dissolved in the same type as Mn, improves softening during work hardening and baking, and obtains high strength after painting baking. Note that the addition of Fe is
Although the amount of solid solution of Mn is noticeably reduced, a decrease in the amount of solid solution of Mn means that y&fine precipitates are formed, which has an advantageous effect on work hardening and suppression of bake softening. do.

If the amount of Fe added is less than 0.1%, the above effects cannot be obtained, and if more than 2.5% of Fe is added, the precipitates will become coarser and the baked paint will sometimes become softer. Therefore, the amount of Fe added was set within the range of 0.1 to 2.5%. Note that the amount of Fe added is preferably within the range of 0.1 to 2.5%, particularly within the range of 0.8 to 2.0%.

As described above, in the invention of claim 1 and the invention of claim 3, the essential alloy component is Mq.

Addition of Mn and Fe@, work hardening due to solid solution of Mq, work hardening due to forced solid solution of transition elements Mn and Fe, and paint baking are aimed at suppressing softening over time, and also taking into consideration cold rollability. There is.

Furthermore, in the invention of claim 2 and the invention of claim 4, in addition to the above-mentioned M(J, Mn, Fe, CUjPj, J:, (j
/or by adding zn, M9. Mn, Fek: In addition to the above-mentioned effects, the paint baking improves the strength of the bond board due to aging hardening.

Next, the reason for limiting the addition of u and zn to these will be explained.

Cu: As mentioned above, Coat 8 baking aims at age hardening during processing, and Coat 8 baking due to this is effective for improving the strength of the subsequent plate. This effect occurs during the precipitation process of Al-CLJ-MCI-based precipitates. In order to obtain this effect, it is necessary to add at least 0.05% of Qu. On the other hand, when Cu is added in an amount of 1.0% or more, the aging effect can be easily obtained, but work hardening occurs easily during cold rolling.
Impairs cold rolling properties. Therefore, when adding Cu, the content of the Cu additive was set within the range of 0.05 to 1.0%.

Zn: It is well known that Zn can be expected to undergo age hardening due to interaction with MCJ and Cu, and in this invention, the addition of Zn also improves the strength of the subsequent plate due to age hardening during processing. It is an object. If zn is less than 0.1%, this effect cannot be obtained, whereas if zn is added in excess of 1.0%, although strength is improved, work hardenability becomes strong and cold rollability is impaired. Therefore, when adding t10 of zn, the amount of zn added is 0.1 to 1.0
It was set within the range of %.

The remainder of each of the above components may be Al and unavoidable IKA materials, regardless of which invention the present application is concerned with.

In addition, in ordinary aluminum alloys, a small amount of Ti or Ti and B is sometimes added to refine the crystal grains of the ingot, and in the case of the present invention, a small amount of Ti or Ti and 8 is also added. May be added. However, when adding Ti, if the amount added is less than 0.01%, the effect of Ti addition cannot be obtained, and if it exceeds 0.50%, primary TiAl3
Since Ti crystallizes and impairs formability, the Ti content is 0.01 to 0.
It is desirable that it be within the range of 50%. Furthermore, when adding B together with Ti, if the amount of B added is less than 19,911 pp, the effect of adding 8 cannot be obtained, while if it exceeds 11,000 pp, coarse particles of Ti 82 will be mixed in and impair the moldability. is preferably within the range of 1 to t000 ppH.

Also, although Si is an unavoidable indispensable substance, it can be added as it has the effect of reducing the rate of decrease in strength after paint baking.However, if the content exceeds 1.0%, the rollability will deteriorate. Therefore, it is desirable that the Si content is 1.0% or less.

Next, manufacturing processes in the methods of each invention of the present application will be explained.

First, a molten alloy having the above-mentioned composition is prepared in accordance with a conventional method, and a thin plate with a thickness of 3 to 15 mm is prepared by a continuous thin plate forming method (continuous tube forming method, etc.). death,
Usually wound into a coil. The cooling rate during this continuous casting must be as high as 50° C./mo or higher. Originally, 8 Fe and Mn, which are transition metals, are difficult to dissolve in aluminum, and most of them crystallize if the cooling rate during casting is slow, so as mentioned above, Fe and Mn
In order to achieve the effect of forced solid solution, 50”C/S!
! A cooling rate of c or more is required. If the cooling rate during casting is less than 50"C/E, the solid solution layer will be insufficient, so the coating cannot sufficiently improve the strength of the plate after baking.
Even if the cooling rate is higher than .degree. C./sec, crystallization or precipitation will occur to some extent. However, if the composition is within the range of the present invention, a fast cooling rate of 50° C./air or higher will result in extremely fine crystallized substances and precipitates, which is advantageous in terms of strength.

Good luck as mentioned above! a The cast plate is subsequently cold rolled. This cold rolling is essential to develop the strength of the blind.

Here, in the method of the invention of claim 1 and the method of the invention of claim 2, the workpiece is finished to jl holly board thickness only by cold rolling without performing intermediate heat treatment (intermediate baking percentage). At this time, in the alloy having the composition of the invention of claim 1 which does not substantially contain Qu and/or Z ri, the cold rolling reduction is 60% or more, and the alloy which contains Cu and/or Zn In the alloy having the composition of the invention described in item 2, it is necessary that the rolling reduction in cold rolling is 50% or more. If the rolling ratio is less than the above values, it becomes difficult to obtain sufficient strength as a blind.

On the other hand, in the method of the invention of claim 3 and the method of the invention of claim 4, the continuous iron plate is subjected to one or more intermediate heat treatments (intermediate baking!I@) and then cold rolled. Do this. That is, after first cold rolling to obtain an intermediate plate thickness, intermediate heat treatment is performed, and then secondary cold rolling is performed as final cold rolling, or after first water-cooled bar rolling,
The intermediate heat 98 mm and the secondary cold rolling are repeated, and the final secondary cold rolling is completed to the product thickness. The intermediate heat treatment in this process is performed with the aim of improving rolling properties without impairing the aging effect of solid solution Cu, Zn, and M9 and the seizure resistance of transition metals 1"e and Mn without impairing the softening effect. In this intermediate heat treatment, during heating (
In order to prevent precipitation during heating (during heating up) and cooling, the heating rate and heating rate are both 10°C/s! ! It is necessary to make it more than c. In addition, the temperature reached in the intermediate heat treatment may be 400°C or higher when the purpose is to recover dislocations.
Furthermore, in order to obtain a completely recrystallized and uniform l1llllIi, it is desirable to reach a temperature of 500°C or higher, but if it exceeds 620°C, there is a risk that eutectic melting will occur and plate breakage will occur during operation. , the temperature reached is 400-620
℃, preferably 500 to 620℃. It is preferable that the temperature be maintained within the range of 400 to 620° C. for as short a time as possible, since this will result in less precipitation, but it is permissible if the temperature is kept at 120° C. or less. Such an intermediate heat treatment that allows rapid heating or cooling at 10° C./atm or more and without holding or holding for a short time of 120 sa or less can be achieved by using a continuous annealing furnace. In addition, even when cold rolling is performed with one or more intermediate heat treatments in between, the rolling rate of the final secondary cold rolling to finish the product thickness is the same as when no intermediate heat treatment is performed. Similarly, in the method of the invention of claim 3 which does not substantially contain Cu and/or Zn, the content must be 60% or more, and in the method of the invention of claim 4 which contains Qu and/or Zn, it is necessary to make it 50% or more. be.

If each rolling rate is lower than the above values, it will be difficult to obtain sufficient strength as a blind.

The aluminum alloy rolled plate that has been processed through the above process has a strength that is superior to conventional materials such as JIS 5083 alloy 818 material and Tsuki 85086 alloy H alloy material after the paint baking, which is an essential condition for blinds. Moreover, it becomes a material with excellent rolling properties.

Examples [Example 1] Alloys with codes A to D within the composition range specified in the invention of claim 1 or claim 3 of the present application as shown in Table 1 and JIS 50B3 alloy which is a conventional material The process shown in Table 2 was applied to an alloy with a component composition code E, which is the same as the conventional material JIS 5086 alloy, and a final plate thickness of 0.10. A rolled plate was obtained. In Table 2, the process for alloy A is the process of the invention of claim 1 of the present application, and the process for alloy C is the process of the invention of claim 3 of the present application.

Table 3 shows the results of examining the mechanical properties of each of the thus obtained rolled plates before and after a heat treatment of 220°C x 30 seconds, which corresponds to baking, for painting.

Table 1: Chemical composition (wt%) of the alloy of Example 1 As shown in Table 3, aluminum alloy rolled plate (alloy code A , C: Inventive example), the strength of the cold-rolled straight bond is not so high compared to the rolled plate obtained from the conventional example or the comparative example, but the strength decrease during treatment with paint baking is extremely small. Therefore, it is clear that the paint baking does not impair the rolling properties, resulting in a material with superior strength.

[Example 2] The alloy with the code G-J within the composition range specified in the invention of claim 2 or claim 4 of the present application as shown in Table 4, and the components of the JIS 5083 alloy, which is a conventional material The process shown in Table 5 was applied to the alloy with the composition code E, which is the same as the alloy with the composition code F of the JIS 5086 alloy, which is a conventional material, to produce a rolled plate with a final plate thickness of 0.1ffff. Obtained. In Table 5, the process for Alloy G is the process of the invention of Claim 2 of the present application, and the process for Alloy I is the process of the invention of Claim 4 of the present application.

Table 6 shows the results of examining the mechanical properties of each of the thus obtained rolled plates before and after heat treatment at 220° C. for 3 osec, which corresponds to baking for paint baking.

Table 4: Chemical composition (wt%) of the alloy of Example 2 As shown in Table 6, aluminum alloy rolled sheets (alloy code G, I: The strength of the cold-rolled Naotoshi is not so high compared to the rolled sheets obtained by the conventional example or the comparative example, but the 11i8 baking shows very little strength loss during rolling, and therefore the rolling properties are improved. It is clear that the material has excellent strength after painting and baking without damaging the surface.

Effects of the Invention According to the method of the present invention, it is possible to obtain an aluminum alloy rolled plate for blinds which has better strength after paint baking treatment than conventional materials without impairing rollability. By applying this, it is possible to increase the strength and reduce the thickness of the aluminum alloy blind, and also to reduce the weight due to the thinner wall.

Claims (4)

[Claims] (1) Mg0.4-2.0% (weight%, same below), M
Contains n0.1-2.5%, Fe0.1-2.5%,
An alloy in which the balance consists of Al and unavoidable impurities is
Continuously cast at a cooling rate of ℃/sec or higher to produce plate thickness 3-15
1. A method for manufacturing an aluminum alloy rolled sheet for blinds, which comprises producing a continuously cast sheet with a thickness of 1.5 mm, and then cold rolling the continuously cast sheet at a rolling rate of 60% or more. (2) Mg0.4-2.0%, Mn0.1-2.5%,
Contains Fe0.1-2.5% and Cu0.05-1
．． 0%, Zn0.1 to 1.0% or two, and the balance is Al and unavoidable impurities.
Continuous casting at a cooling rate of 50°C/sec or more to produce a plate with a thickness of 3~
A method for manufacturing an aluminum alloy rolled sheet for blinds, which comprises forming a 15 mm continuous cast sheet, and then cold rolling the continuously cast sheet at a rolling rate of 50% or more. (3) Mg0.4-2.0%, Mn0.1-2.5%,
An alloy containing 0.1 to 2.5% Fe and the balance consisting of Al and unavoidable impurities is continuously cast at a cooling rate of 50°C/sec or more to obtain a continuously cast plate with a thickness of 3 to 15 mm. After performing primary cold rolling on the continuously cast plate, 4
Raise the temperature to a temperature within the range of 00 to 620 °C at a heating rate of 10 °C/sec or more and immediately or at that temperature for 120 seconds.
An intermediate heat treatment in which the material is maintained at a temperature of 10° C. or less and then cooled at a cooling rate of 10° C./sec or more, followed by secondary cold rolling once or twice or more, and the final secondary cold rolling is performed. A method for manufacturing an aluminum alloy rolled plate for blinds, characterized in that the manufacturing method is carried out at a rate of 60% or more. (4) Mg0.4-2.0%, Mn0.1-2.5%,
Contains Fe0.1-2.5% and Cu0.05-1
．． 0%, Zn0.1 to 1.0% or two, and the balance is Al and unavoidable impurities.
Continuous casting at a cooling rate of 50°C/sec or more to produce a plate with a thickness of 3~
A 15 mm continuous cast plate, and then 1
After cold rolling, the temperature is raised to a temperature within the range of 400 to 620°C at a heating rate of 10°C/sec or more, and immediately or after holding at that temperature for 120 seconds or less.
Intermediate heat treatment of cooling at a cooling rate of 0° C./sec or more;
A method for manufacturing an aluminum alloy rolled sheet for blinds, characterized in that the subsequent secondary cold rolling is performed once or twice or more, and the final secondary cold rolling is performed at a rolling ratio of 50% or more.