JPH11293362A - Manufacture of aluminum alloy for elongated material, and aluminum alloy elongated material obtained thereby - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for reproducing recovered aluminum alloy casting scrap and obtaining an aluminum alloy applicable to an elongated material. SOLUTION: Aluminum alloy elongated material scrap or an ingot metal is added to aluminum alloy casting scrap to melt the scrap and dilute impurities. The resultant molten aluminum alloy after being molten and diluted is purified by means of batch-type alpha solid solution separation treatment where cooling and pressing are performed in a same vessel to recover a solid phase and thereafter, are performed to component regulation, if necessary. It is desirable that automobile aluminum alloy casting scrap comprises >=50% of the aluminum alloy casting scrap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an aluminum alloy for wrought material and an aluminum alloy wrought material obtained by the method. The present invention relates to a method for producing an aluminum alloy for wrought material that can be recycled as an aluminum alloy wrought material for automobile members, bicycles, motorcycles, vehicle materials, building members, and the like.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for effective use of resources such as recycling in all fields, and aluminum is no exception and recycling of resources is desired. When recycling aluminum alloy materials, as a general method, a method is adopted in which high-grade materials with few impurities are recycled into low-grade materials with many impurities. Therefore, every time an aluminum alloy is recycled, it is recycled into a lower-grade material with a large amount of impurities, and is finally used for a casting part or the like containing a large amount of impurities.

[0003] Furthermore, when cast parts are turned into scraps, some are used as steel deoxidizing materials, while others are recycled to castings or discarded as surplus waste without a destination. Met.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a manufacturing method capable of regenerating aluminum alloy casting waste and obtaining an aluminum alloy applicable to wrought products.

[0005]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above problems, and as a result, added aluminum alloy wrought material scrap or ingot to aluminum alloy casting scrap, melted and diluted, and purified and refined. It has been found that the above-mentioned problems can be solved by performing component adjustments as needed, and based on this, the present invention has been completed.

That is, according to the present invention, aluminum alloy wrought material scrap or bullion obtained from wrought material collection refuse or the like is added to aluminum alloy casting refuse obtained from scrap car recovery or the like, and dissolved to dilute impurities. The aluminum alloy melt after dissolution dilution is purified and refined by batch-type α solid solution separation processing in which the solid phase is recovered by cooling and squeezing in the same container, and adjusting the components before and after as necessary. A method for producing an aluminum alloy for a wrought material member, characterized in that: In this case, it is effective that 50% or more of the aluminum alloy casting waste is composed of automotive aluminum alloy casting waste. Further, the composition of the aluminum alloy after the purification and purification or after the component adjustment is performed as required, has an Si0.
5 to 5.0 wt%, Mg 0.2 to 5.0 wt%, Mn0.0
1-1.2 wt%, Zn0.1-1.2 wt%, Cu0.2
-1.2 wt%, Fe 0.2-2.0 wt%, and C
r 0.01 to 0.2 wt%, Zr 0.01 to 0.2 wt%,
It is also effective to use one or two or more of V 0.01 to 0.2 wt% and Ti 0.01 to 0.2 wt%, the balance being Al and unavoidable impurities.

The wrought aluminum alloy of the present invention is
Add aluminum alloy wrought material waste or ingot to aluminum alloy casting waste, dissolve and dilute impurities, cool and squeeze the melted and diluted aluminum alloy in the same vessel to form a solid phase. The alloy composition after the purification and purification by the batch type α solid solution separation treatment to be recovered, and then the component adjustment as needed, is 0.5 to 5.0 wt% of Si.
%, Mg 0.2 to 5.0 wt%, Mn 0.01 to 1.2 wt%
%, Zn 0.1 to 1.2 wt%, Cu 0.2 to 1.2 wt%
%, Fe 0.2 to 2.0 wt%, and Cr 0.01
~ 0.2wt%, Zr0.01 ~ 0.2wt%, V0.01
An aluminum alloy containing one or more of Ti-0.2 wt% and 0.01-0.2 wt% of Ti, the balance being Al and unavoidable impurities.

Another wrought aluminum alloy according to the present invention is a wrought aluminum alloy containing at least 50% of wrought aluminum alloy castings, to which wrought aluminum alloy swarf or ingot is added and melted to remove impurities. The aluminum alloy melt after dilution and dissolution is purified and refined by batch-type α solid solution separation in which the solid phase is recovered by cooling and squeezing in the same vessel and then adjusting the components as necessary. Alloy composition after Si is 0.5 to 5.0 wt%
%, Mg 0.2 to 5.0 wt%, Mn 0.01 to 1.2 wt%
%, Zn 0.1 to 1.2 wt%, Cu 0.2 to 1.2 wt%
%, Fe 0.2 to 2.0 wt%, and Cr 0.01
~ 0.2wt%, Zr0.01 ~ 0.2wt%, V0.01
An aluminum alloy containing one or more of Ti-0.2 wt% and 0.01-0.2 wt% of Ti, the balance being Al and unavoidable impurities.

As described above, the present invention provides a method for producing an aluminum alloy for wrought material and an aluminum alloy wrought material obtained by the method.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below. The present invention, aluminum alloy casting waste, wrought aluminum alloy wrought scrap or wrought metal such as wrought material collection scrap, melted, diluted, purified, refined, by adjusting the components as necessary, This is to produce an aluminum alloy for wrought material from casting waste.

The purification and purification method at this time includes a batch type α solid solution separation method in which the molten aluminum alloy is subjected to cooling and pressing in the same vessel during the α solid solution separation treatment to recover a solid phase. Purification and purification are performed by applying the treatment. In this batch-type α solid solution separation process, the molten aluminum is cooled to below the liquidus temperature in a container, and the primary crystals of aluminum with few impurities crystallized at a temperature above the solidus temperature are compressed in the same container. Is to separate and separate from the liquid phase, and purify and purify aluminum by collecting this solid phase.
It is possible to effectively remove impurities represented by Si. Here, the reason for adopting the batch type α solid solution separation treatment is that, with a relatively small-scale device, Si in the aluminum alloy melt can be mainly removed efficiently, and in addition, it is contaminated with other impurities in the purification process. Because they found nothing.

In this purification and purification, other general purification and purification can be applied before and after the batch type α solid solution separation treatment. For example, it is effective to perform an iron content reduction process as a pre-process of the batch type α solid solution separation process.

[0013] Here, as the waste used for dilution,
There is no particular need to set a limit, and the amount of Si
Any amount can be used as long as the amount is small, and various kinds of chips obtained in the processing process such as scraps available on the market, for example, aluminum can scraps (UBC), aluminum sash scraps, automobile structural materials, other aluminum plate product scraps, and aluminum extruded product scraps. Waste is applicable.

Various aluminum alloy members such as castings and wrought materials are used in automobiles. Therefore, when the method of the present invention is applied to aluminum alloy casting waste generated from automobiles to purify and purify the resulting aluminum alloy as a wrought material, the circulating use of aluminum alloy material as a material for automobiles That is, recycling can be achieved.

Further, the present invention relates to a method for producing an aluminum alloy for wrought material, wherein at least 50% of the aluminum alloy casting waste is constituted by automotive aluminum alloy casting waste in order to achieve recycling. It is. Also, since 50% or more of the molten raw material can use aluminum alloy casting waste, the recycling effect is remarkably large.

Further, in the present invention, after dissolution dilution, purification and purification,
The components can be adjusted as needed. The composition of the aluminum alloy after purification / purification or after component adjustment as needed is 0.5 to 5.0 wt% of Si, 0.2
-5.0 wt%, Mn0.01-1.2 wt%, Zn0.1
~ 1.2wt%, Cu0.2 ~ 1.2wt%, Fe0.2 ~
2.0 wt%, Cr 0.01-0.2 wt%, Z
r0.01-0.2wt%, V0.01-0.2wt%, T
It is preferable to use one or more of i-0.01 to 0.2 wt% and the balance consisting of Al and unavoidable impurities, but in particular, Cr 0.01 to 0.2 wt%, Zr 0.01
~ 0.2wt%, V0.01 ~ 0.2wt%, Ti0.01
It is desirable to contain one or more of the above-mentioned 0.2 wt%. These elements can supplement the properties required for wrought materials.

Si, Mg, Mn, Zn, Cu and Fe
Increases the strength of the wrought aluminum alloy while ensuring the required elongation. If the content is too small, the effect is insufficient, and if it is too large, workability such as rolling or extrusion is significantly reduced. Further, the elements selected from the above Cr, Zr, V, and Ti improve the bendability and toughness of the alloy by refining the crystal grains, but the effect is insufficient if the amount is small, and if the amount is too large, aluminum and coarse metal Since an inter-compound is formed and the toughness is deteriorated conversely, the above-mentioned range of the addition amount of these elements is desirable.

In the present invention, the primary crystal Si is refined as necessary to improve elongation and toughness.
r and Sb can be added in a predetermined range. In general, the effect of Na in addition to Sr and Sb is also known for the refinement of primary crystal Si, but in the case of the present invention, it is used not as an aluminum alloy casting but as an aluminum alloy wrought material. Therefore, Sr and Sb are used because Na, which causes hot brittle cracking, cannot be used. S
The addition amount of r and Sb is desirably 50 to 300 ppm. If the added amount is less than 50 ppm, the effect is insufficient, and if it exceeds 300 ppm, the effect is saturated.

[0019]

Next, the present invention will be described in more detail with reference to examples. At the mixing ratios shown in Table 1, the casting waste, the wrought material waste, or the base metal were dissolved and diluted. Purification and refining treatment was performed through the steps shown in the table to obtain a purified and refined alloy and a concentrated alloy.

As the purification and purification conditions at this time, for example, a batch type α solid solution separation treatment as disclosed in JP-A-7-54061 can be applied. That is, the α-Al solid phase was grown by cooling the molten aluminum alloy from the liquidus temperature, and when the target temperature was reached, the solid phase (purified and refined alloy) and the liquid phase (concentrated alloy) were separated. Further, in some examples, before the batch type α solid solution separation treatment, for example, an iron content reduction treatment as described in JP-A-60-234930 was performed to purify and purify Fe. The refined and purified alloy obtained after the α solid solution separation treatment was subjected to component adjustment as necessary at each stage of melting, dilution and purification and purification to obtain an alloy for wrought material.

Further, the chemical composition of the alloy was investigated at each stage of dilution and purification, and the chemical composition obtained at each stage is summarized in Table 1.

[0022]

[Table 1]

Further, the obtained alloy was processed into a wrought material shown in Table 2. In Table 2, the extruded material was cast into a billet for extrusion, subjected to soaking at 530 ° C. × 4H, cooled to room temperature, and further cooled to 450 ° C.
C., and extruded at that temperature into a hollow profile having a side-shaped cross section with a side of 40 mm × a plate thickness of 2 mm.

The rolled material was cast on a rolling ingot, subjected to surface treatment, subjected to soaking at 530 ° C. × 4H, and then subjected to hot rolling at a rolling reduction of 90% in the range of 500 ° C. to 280 ° C. After forming a thin plate having a thickness of 4 mm, cold rolling was performed by 50% to obtain a rolled thin plate having a thickness of 2 mm. Further, the extruded material and the rolled material were cooled to room temperature, and then subjected to an aging treatment at 180 ° C. × 2H. In addition, these materials were evaluated for material properties such as tensile properties and bending workability as described below.

The tensile test was performed at a tensile speed of 10 mm / min by an Instron type tensile test using a JIS No. 5 test piece, and the tensile strength, proof stress, and elongation value were obtained. Bending test is JI
A 180 ° and 90 ° bending test was performed on the S3 bending test piece after processing. The bending test was evaluated as ◎ if no cracks occurred in both 180 ° bending and 90 ° bending, good if no cracking occurred only in 90 ° bending, and ○ as bad if both cracks occurred. . In both the tensile test and the bending test, the extruded material was 5 mm from both the outer edge and the middle column.
The test specimen was cut out, and the thin-rolled material was cut into 5
After the test pieces were cut out and tested for these test pieces, the average was determined and used as the measured value. In addition, these materials have a proof strength of 80 N /
mm ² or more, preferably 100 N / mm ² or more, elongation value 5 wt
%, Preferably 10% by weight or more, and it is necessary that no crack occurs in the bending test.

[0026]

[Table 2]

As shown in Table 2, as shown in FIG.
Nos. 1 to 4 satisfy the above-mentioned target values used as the wrought material in tensile properties (tensile strength, proof stress, elongation value) and bendability, while Comparative Example No. 5 The characteristic values are inferior to those of the invention examples.

[0028]

As described above, according to the present invention, since the aluminum alloy casting waste can be used as an aluminum alloy wrought material for automobile parts and the like, it is widely used and has a remarkable effect on the effective use of aluminum resources. I do.

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Noboru Hayashi 1-4-1 Chuo, Wako-shi, Saitama

Claims (5)

[Claims] 1. An aluminum alloy casting waste and aluminum alloy wrought material waste or ingot are added and dissolved to dilute impurities.
Aluminum alloy for wrought material characterized by purifying and refining by batch type α solid solution separation process of recovering solid phase by cooling and squeezing in the same container, and adjusting components as needed before and after Production method. 2. The method for producing an wrought aluminum alloy according to claim 1, wherein 50% or more of the aluminum alloy casting waste is constituted by automotive aluminum alloy casting waste. 3. The composition of the aluminum alloy after purification and refining, or after component adjustment as required, is Si0.
5 to 5.0 wt%, Mg 0.2 to 5.0 wt%, Mn0.0
1-1.2 wt%, Zn0.1-1.2 wt%, Cu0.2
-1.2 wt%, Fe 0.2-2.0 wt%, and C
r 0.01 to 0.2 wt%, Zr 0.01 to 0.2 wt%,
3. The wrought product according to claim 1, wherein the wrought material contains one or more of V 0.01 to 0.2 wt% and Ti 0.01 to 0.2 wt%, and the balance is Al and inevitable impurities. Of manufacturing aluminum alloys for automobiles. 4. Addition of aluminum alloy wrought material scrap or ingot to aluminum alloy casting scrap and dissolve to dilute impurities, and dissolve and dilute aluminum alloy melt.
Purification and purification are performed by batch-type α solid solution separation processing in which cooling and squeezing are performed in the same container to recover a solid phase, and then, if necessary, component adjustment is performed.
0.5-5.0 wt%, Mg 0.2-5.0 wt%, Mn
0.01 to 1.2 wt%, Zn 0.1 to 1.2 wt%, Cu
0.2-1.2wt%, Fe0.2-2.0wt%,
And Cr 0.01 to 0.2 wt%, Zr 0.01 to 0.2
wt%, V0.01-0.2wt%, Ti0.01-0.2
An aluminum alloy wrought product, characterized in that it is an aluminum alloy containing one or more of wt% and the balance being Al and unavoidable impurities. 5. An aluminum alloy casting swarf for automobiles is reduced by 50%.
% Of aluminum alloy casting waste and aluminum alloy wrought metal waste or metal in addition to metal alloy melts to dilute impurities. Cool and squeeze the melted and diluted aluminum alloy in the same vessel. Purification and purification are performed by a batch-type α solid solution separation process of recovering the solid phase, and then, if necessary, the alloy composition after component adjustment is changed to Si 0.5 to
5.0 wt%, Mg 0.2-5.0 wt%, Mn0.01-
1.2wt%, Zn0.1 ~ 1.2wt%, Cu0.2 ~
1.2 wt%, Fe 0.2-2.0 wt%, and Cr
0.01-0.2wt%, Zr0.01-0.2wt%, V
An aluminum alloy wrought material characterized in that it is an aluminum alloy containing one or more of 0.01 to 0.2 wt% and 0.01 to 0.2 wt% of Ti and the balance of Al and unavoidable impurities. .