KR20160139138A - Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it, product manufactured by the method - Google Patents

Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it, product manufactured by the method Download PDF

Info

Publication number
KR20160139138A
KR20160139138A KR1020150073491A KR20150073491A KR20160139138A KR 20160139138 A KR20160139138 A KR 20160139138A KR 1020150073491 A KR1020150073491 A KR 1020150073491A KR 20150073491 A KR20150073491 A KR 20150073491A KR 20160139138 A KR20160139138 A KR 20160139138A
Authority
KR
South Korea
Prior art keywords
aluminum alloy
casting
strength
alloy composition
die casting
Prior art date
Application number
KR1020150073491A
Other languages
Korean (ko)
Other versions
KR101684305B1 (en
Inventor
허일
이동근
Original Assignee
주식회사 에스제이테크
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 에스제이테크 filed Critical 주식회사 에스제이테크
Priority to KR1020150073491A priority Critical patent/KR101684305B1/en
Publication of KR20160139138A publication Critical patent/KR20160139138A/en
Application granted granted Critical
Publication of KR101684305B1 publication Critical patent/KR101684305B1/en

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/10Alloys based on aluminium with zinc as the next major constituent

Abstract

The present invention relates to an alloy for die casting capable of producing an electric device part or an automobile part which requires high tensile strength and yield strength as well as high fluidity and castability and is required to have high durability and moldability in a thin plate form, And castings.
The aluminum alloy for die casting according to the present invention is composed of zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg), iron (Fe), and the balance aluminum (Al).
The aluminum alloy composition for die casting according to the present invention can be produced by adding a metal element such as zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg) Strength and tensile strength of 350 MPa or more are exhibited so that it is possible to provide sufficient strength even when formed into a thin plate shape and it is possible to precisely produce complex shaped castings without dimensional error due to excellent mold filling ability without being adhered to the inner wall of the mold, As the thermal conductivity is also considerable, it can be used as an electric device part or an automobile part.

Description

TECHNICAL FIELD The present invention relates to an aluminum alloy composition for die casting which is excellent in strength and castability, a method for producing a casting product using the same, and a cast product produced by the method and a method for manufacturing castings using the cast aluminum alloy composition }

The present invention relates to a steel sheet having excellent tensile strength and yield strength as well as excellent fluidity and castability by adding zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg) To an alloy composition for die casting which is capable of manufacturing electric parts and automobile parts which require durability and moldability, a method of manufacturing the casting and a casting using the alloy composition.

Aluminum is a silvery white soft metal, excellent in malleability and ductility, excellent in light weight and durability, and easy to react with oxygen, but it is widely used as a material in various fields because it has an advantage of improving corrosion after coating on the surface.

There is a plastic working method in which an aluminum plate is pressed into a desired shape by a method of manufacturing a product by aluminum and a die casting method in which aluminum casting is injected into a metal die machined into a product shape to produce the same casting.

The products produced by the die casting method have advantages of accurate dimensions, and are used for automobile or aircraft parts, electronic devices, and optical devices requiring relatively complicated designs. Typical aluminum alloys used are ALDC12 and AZ91D.

The ALDC12 alloy has a yield strength of 165 MPa and a tensile strength of 331 MPa. The AZ91D alloy has a yield strength of 150 MPa and a tensile strength of 230 MPa, which are applied to slim products such as smartphones or tablet cases that require strength It is difficult to do. The ZA27 alloy exhibits a yield strength of 365 MPa and a yield strength of 426 MPa, which is excellent in strength but has a specific gravity of 5 g / cc, which is heavier than an aluminum alloy and has a limitation in weight reduction.

To solve this problem, Korean Patent Registration No. 1133103 proposes a "high strength aluminum alloy for die casting ". The proposed aluminum alloy improves the strength by adding zinc (Zn), magnesium (Mg), copper (Cu), zirconium (Zr) and titanium (Ti) to the aluminum base. However, since the above alloy requires aging treatment at 120 ° C. for more than 24 hours, not only the productivity is lowered but also the alloy melt injected into the mold at a high speed is disadvantageously adhered to the inner wall of the mold.

As another example, Korean Patent Laid-Open Publication No. 2014-0025043 proposes a "Al-Zn alloy for die casting" which simultaneously exhibits high strength and high thermal conductivity. The aluminum base includes zinc (Zn), magnesium (Mg) To improve not only the strength but also the ductility of the alloy melt and the mold, thereby improving the castability.

However, since the above alloy has a tensile strength of only 230 MPa, it is not used for high strength applications and the fluidity of the alloy melt is insufficient, so that filling of the mold is not properly performed during molding. it's difficult.

1. Korean Registered Patent No. 1133103 entitled High Strength Aluminum Alloy for Die Casting, Apr. 22, 2010) 2. Description of the Related Art Korean Unexamined Patent Publication No. 2014-0025043 (entitled Al-Zn alloy for die casting simultaneously exhibiting high strength and high thermal conductivity, 2014.03.04)

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an aluminum alloy composition for die casting having tensile strengths of 250 MPa and 350 MPa, respectively, .

It is another object of the present invention to provide a method for producing a cast article which can provide a sufficient strength to a product molded using such an aluminum alloy composition and can precisely manufacture a complicated shape without error.

It is still another object of the present invention to provide an electric device part or an automobile part using such an aluminum alloy composition.

In order to solve the above problems, the aluminum alloy composition for die casting according to the present invention comprises zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg), iron (Fe) .

In the present invention, the zinc (Zn) may be added in an amount of 9 to 20% by weight based on the total weight.

Also, in the present invention, the silicon (Si) may be added in an amount of 7 to 10 wt% based on the total weight.

In the present invention, the titanium (Ti) may be added in an amount of 0.05 to 1.5% by weight based on the total weight.

Also, in the present invention, the iron (Fe) may be added in an amount of 0.3 to 1.0 wt% based on the total weight.

In the present invention, the aluminum alloy may further include copper (Cu), tin (Sn), chromium (Cr), manganese (Mn), and nickel (Ni).

In the present invention, copper (Cu) may be added in an amount of 1.4 to 3.0 wt%, tin (Sn), chromium (Cr), manganese (Mn) and nickel (Ni) may be added in an amount of 0.2 wt% .

In the present invention, the aluminum alloy composition for die casting may have a tensile strength of 350 MPa or more and a yield strength of 250 MPa or more and an elongation of 3% or more.

According to another aspect of the present invention, there is provided a method of manufacturing a casting product using an aluminum alloy composition, comprising the steps of preparing an aluminum alloy composition according to the present invention, dissolving the aluminum alloy composition and supplying the alloy melt to a die casting mold, . ≪ / RTI >

Further, in the present invention, the casting temperature of the alloy melt injected into the die casting mold may be 680 to 750 ° C.

In the present invention, the casting pressure of the die casting mold may be 75 MPa.

According to another aspect of the present invention, the casting manufactured according to the manufacturing method of the present invention may be an electric device part or an automobile part.

In the present invention, the electric device parts and the automobile parts may be in the form of a thin plate having a thickness of 0.1 to 1 mm.

The aluminum alloy composition for die casting according to the present invention can be produced by adding a metal element such as zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg) Strength and tensile strength of 350 MPa or more are exhibited so that it is possible to provide sufficient strength even when formed into a thin plate shape and it is possible to precisely produce complex shaped castings without dimensional error due to excellent mold filling ability without being adhered to the inner wall of the mold, As the thermal conductivity is also considerable, it can be used as an electric device part or an automobile part.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

One aspect of the present invention relates to an aluminum alloy composition which comprises zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg), chrome (Cr), copper (Fe), manganese (Mn), nickel (Ni), tin (Sn) and the remainder aluminum (Al).

Zinc (Zn) maximizes the improvement in castability and strength, and is added in an amount of 9.0 to 20.0% by weight based on the total weight of the alloy. When zinc (Zn) is added in an amount exceeding 20.0% by weight, corrosion resistance and toughness are lowered. Therefore, it is appropriate to add 12.0% by weight so as to satisfy both castability, strength and corrosion resistance and toughness.

Silicon (Si) improves fluidity and strength, and is added in an amount of 7.0 to 10.0 wt% based on the total weight of the alloy. If the content of silicon (Si) exceeds 10.0% by weight, heat treatment is weak and cracking occurs. If it is less than 7.0% by weight, the fluidity is lowered and the filling property of the alloy melt into the mold is lowered. Therefore, silicon (Si) is preferably added in an amount of 8.5 wt% so as to improve both the fluidity and strength in the mold and the heat treatment.

Titanium (Ti) improves moldability and strength through refinement of crystal grains and is added in an amount of 0.05 to 1.5% by weight based on the total weight of the alloy. If the amount of titanium (Ti) exceeds 1.5% by weight, the flow of the molten metal is lowered and the defects are promoted. Therefore, it is appropriate to add 1.0% by weight to improve moldability and strength and to prevent defects.

Magnesium (Mg) rapidly grows dense surface oxidation layer (MgO) to prevent internal corrosion and improve strength. It is added in an amount of 0.05 to 0.15% by weight based on the total weight of the alloy. If the magnesium (Mg) content exceeds 0.15% by weight, the fluidity is lowered and the original purpose of producing a product having a complicated shape can not be achieved. Therefore, it is preferable that magnesium (Mg) is added in an amount of 0.1% by weight for improving corrosion resistance and strength and proper fluidity.

Iron (Fe) is added in an amount of 0.3 to 1.0% by weight based on the total weight of the alloy, to prevent the alloy melt from sticking to the inner wall of the mold and to improve the strength. When iron (Fe) exceeds 1.0% by weight, corrosion resistance is lowered and precipitates are formed. Therefore, it is preferable to add 0.6% by weight so as to prevent stickiness, to improve strength and corrosion resistance.

Copper (Cu) plays a role in improving the strength of the alloy due to the hardening effect. Such copper is added in an amount of 1.4 to 3.0% by weight based on the total weight of the alloy. If the copper content is less than 1.4 wt%, the effect of improving the strength is deteriorated. If the copper content exceeds 3.0 wt%, the corrosion resistance is deteriorated.

Tin (Sn) improves moldability and machinability and is added at less than 0.2 wt% based on the total weight of the alloy. When the content of tin (Sn) exceeds 0.2% by weight, the corrosion resistance is lowered, so that it is preferably added in an amount of 0.03% by weight so as to combine both moldability, machinability and corrosion resistance.

Chromium (Cr) is added to improve the corrosion resistance by 0.2 wt% or less based on the total weight of the alloy. If chromium (Cr) is added in an amount exceeding 0.2 wt%, the strength is lowered and the original purpose can not be achieved. When Cr (Cr) is added in an amount of 0.1% by weight, corrosion resistance and strength can be all satisfied.

Manganese (Mn) is added at less than 0.2% by weight based on the total weight of the alloy, which enhances corrosion resistance, increases softening resistance at high temperatures, and improves surface treatment characteristics. When Mn is more than 0.2% by weight, the main composition is lowered. Therefore, it is appropriate to add 0.1% by weight of Mn so as to improve corrosion resistance, softening resistance, surface treatment and casting.

Nickel (Ni) has a tendency to be prohibited as a harmful element, but it plays a role of improving the corrosion of the alloy. When nickel is added, it is added in an amount of less than 0.2% by weight based on the total weight of the alloy, and corrosion resistance is not remarkably improved even when nickel is further added.

Another aspect of the present invention is a method for producing a cast article using the above-described aluminum alloy composition. First, an aluminum alloy composition is prepared by the composition ratio of the above-described metal elements. In other words. (Si), 0.05 to 1.5 wt% of titanium (Ti), 0.05 to 0.15 wt% of magnesium (Mg), 0.3 to 1.0 wt% of iron (Fe), 1.4 to 3.0 wt% of copper (Cu), 0.3 to 1.0 wt% of iron (Fe), 0.2 wt% or less of each of tin (Sn), chromium (Cr), manganese (Mn) ) And aluminum (Al) as the remainder.

Then, the prepared aluminum alloy composition is melted in a melting furnace, and the alloy melt is supplied to a die casting mold to complete the casting. At this time, if the casting temperature of the die casting is low, there arises a problem in the mold filling ability due to the lowering of fluidity, and if it is high, the shrinkage ratio during solidification increases, thereby causing cracks. The casting is then made with a casting pressure of 75 MPa.

The finished cast product thus obtained exhibits excellent yield strength (250 MPa or more) and tensile strength (350 MPa or more) as a metal element is added to aluminum in an appropriate composition. Further, as the proper composition of iron is added, the alloy melt at the time of casting is not adhered to the inner wall of the mold, and silicone is added to improve the mold filling property of the alloy melt, so that it is possible to manufacture a thin plate shaped casting product having a thickness of only 0.1-1 mm . The casting according to the present invention is excellent in strength and thermal conductivity as well as strength, so it can be applied to electric parts such as electric appliance, smartphone case, backlight unit cover, heat sink, and automobile parts such as engine fan, bracket and rack housing Do.

Hereinafter, a specific embodiment of the present invention will be described.

<Preparation of aluminum alloy>

The aluminum alloy compositions (Examples 1 and 2) according to the present invention and the aluminum alloy compositions (Comparative Examples 1 and 2) comparable to those of the present invention were prepared in the following composition ratios.

Figure pat00001

<Production of Tensile Test Specimen>

Four kinds of alloys prepared were each produced a tensile test piece of the following ASTM Subsize standard according to the above-mentioned manufacturing method.

Figure pat00002

<Measurement of Strength and Elongation Rate>

Four kinds of tensile test specimens were measured using a universal material tester (Instron 5982), and tensile strength, yield strength and elongation were measured.

Figure pat00003

<Measurement of dimensional error>

As a result of measuring the width and thickness of the manufactured tensile test specimen using the measuring instrument, in Examples 1 and 2, the target dimensions and errors were measured as + 0.02% and + 0.007%, respectively, and were measured within the standard error range of ± 0.05% However, in Comparative Examples 1 and 2, the errors were measured as + 0.08% and -0.06%, respectively, and exceeded the reference error range.

Figure pat00004

<Experimental Results>

In Examples 1 and 2, the yield strength, the tensile strength and the elongation were higher than those of Comparative Example 1 and Comparative Example 2, respectively. In addition, the dimensions of Examples 1 and 2 showed little error, whereas Comparative Examples 1 and 2 showed some errors. Thus, it was proved that Examples 1 and 2 have excellent strength and superior casting properties.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It is therefore intended that such variations and modifications fall within the scope of the appended claims.

Claims (13)

In an aluminum alloy composition for die casting excellent in strength and castability,
Aluminum alloy composition for die casting characterized in that it is made of zinc (Zn), silicon (Si), titanium (Ti), magnesium (Mg), iron (Fe) and the balance aluminum (Al).
The method according to claim 1,
Wherein the zinc (Zn) is added in an amount of 9 to 20 wt% based on the total weight of the aluminum alloy composition.
The method according to claim 1,
Wherein the silicon (Si) is added in an amount of 7 to 10 wt% based on the total weight of the aluminum alloy composition.
The method according to claim 1,
Wherein the titanium (Ti) is added in an amount of 0.05 to 1.5% by weight based on the total weight of the aluminum alloy composition.
The method according to claim 1,
Wherein the iron (Fe) is added in an amount of 0.3 to 1.0 wt% based on the total weight of the aluminum alloy composition.
The method according to claim 1,
Further comprising at least one of copper (Cu), tin (Sn), chromium (Cr), manganese (Mn) and nickel (Ni).
The method according to claim 6,
Wherein the copper alloy is added in an amount of 1.4 to 3.0 wt% based on the total weight of the aluminum alloy and 0.2 wt% or less of tin (Sn), chromium (Cr), manganese (Mn) Composition.
The method according to claim 1,
Wherein the aluminum alloy composition for die casting has a tensile strength of 350 MPa or more and a yield strength of 250 MPa or more and an elongation percentage of 3% or more.
A method of manufacturing an aluminum alloy casting,
9. A method of manufacturing an aluminum alloy composition, comprising: preparing an aluminum alloy composition according to any one of claims 1 to 8; And
And dissolving the aluminum alloy composition and supplying the alloy melt to a die casting mold to produce a casting product.
10. The method of claim 9,
Wherein the casting temperature of the alloy melt injected into the die casting mold is 680 to 750 占 폚.
10. The method of claim 9,
Wherein the casting pressure of the die casting mold is 75 MPa.
An aluminum alloy casting according to any one of claims 9 to 11, characterized in that the casting is an electronic device part or an automobile part. 13. The method of claim 12,
Wherein the casting is in the form of a thin plate having a thickness of 0.1 to 1 mm.
KR1020150073491A 2015-05-27 2015-05-27 Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it KR101684305B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150073491A KR101684305B1 (en) 2015-05-27 2015-05-27 Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150073491A KR101684305B1 (en) 2015-05-27 2015-05-27 Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it

Publications (2)

Publication Number Publication Date
KR20160139138A true KR20160139138A (en) 2016-12-07
KR101684305B1 KR101684305B1 (en) 2016-12-08

Family

ID=57572630

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150073491A KR101684305B1 (en) 2015-05-27 2015-05-27 Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it

Country Status (1)

Country Link
KR (1) KR101684305B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111041302A (en) * 2020-01-07 2020-04-21 张静怡 Novel high-strength die-casting aluminum alloy with remarkable natural aging strengthening characteristic and preparation method thereof
WO2021128619A1 (en) * 2019-12-26 2021-07-01 比亚迪股份有限公司 Aluminum alloy and preparation method thereof, and aluminum alloy structural member

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101133103B1 (en) 2008-10-14 2012-04-09 한국생산기술연구원 High strength aluminum alloys for die casting
KR20140018048A (en) * 2012-08-03 2014-02-12 삼성전자주식회사 Alumium silicon zinc alloy for die-casing
KR20140025043A (en) 2012-08-21 2014-03-04 한국생산기술연구원 Al-zn alloy having high tensile strength and high thermal conductivity for die casting

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101133103B1 (en) 2008-10-14 2012-04-09 한국생산기술연구원 High strength aluminum alloys for die casting
KR20140018048A (en) * 2012-08-03 2014-02-12 삼성전자주식회사 Alumium silicon zinc alloy for die-casing
KR20140025043A (en) 2012-08-21 2014-03-04 한국생산기술연구원 Al-zn alloy having high tensile strength and high thermal conductivity for die casting

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021128619A1 (en) * 2019-12-26 2021-07-01 比亚迪股份有限公司 Aluminum alloy and preparation method thereof, and aluminum alloy structural member
CN111041302A (en) * 2020-01-07 2020-04-21 张静怡 Novel high-strength die-casting aluminum alloy with remarkable natural aging strengthening characteristic and preparation method thereof

Also Published As

Publication number Publication date
KR101684305B1 (en) 2016-12-08

Similar Documents

Publication Publication Date Title
KR101691001B1 (en) Die-cast aluminum alloy composition with excellent corrosion resistance and strength
EP3121302B1 (en) Aluminum alloy for die casting, and die-cast aluminum alloy using same
JP6427268B2 (en) Die-casting aluminum alloy with improved corrosion resistance, frequency filter and method of manufacturing communication device parts
KR20190073465A (en) Thermally Conductive Aluminum Alloys and Their Uses
CN106282697A (en) Aluminium diecasting alloy compositions, the casting piece utilizing it and manufacture method
KR101545970B1 (en) Al-Zn ALLOY HAVING HIGH TENSILE STRENGTH AND HIGH THERMAL CONDUCTIVITY FOR DIE CASTING
KR20100041532A (en) High strength aluminum alloys for die casting
JPWO2015151369A1 (en) Aluminum alloy and die casting method
KR101684305B1 (en) Aluminum alloy composition for die-casting with high strength and castability, method for manufacturing castings using it
JP5969713B1 (en) Aluminum alloy for die casting and aluminum alloy die casting using the same
KR20140034557A (en) Al-cu alloy having high thermal conductivity for die casting
KR20130083183A (en) Al-fe-zn-si alloy having high thermal conductivity for die casting
US20190161834A1 (en) High-strength aluminum alloy for die casting having excellent corrosion resistance and thermal conductivity, method for producing the same, and method for producing aluminum alloy casting using the same
KR20140025042A (en) Al-zn alloy having high thermal conductivity for die casting
KR101274089B1 (en) High strength aluminum alloys for die casting
KR101744012B1 (en) Method of producing an aluminum alloy for die-casting and aluminum alloy castings using the same
KR101779439B1 (en) Method of producing an aluminum alloy for die-casting and aluminum alloy castings using the same
KR102217940B1 (en) Aluminum alloy for die casting having an excellent heat releasing property and manufacturing method thereof
KR101589035B1 (en) Al-Zn-Mg-Cu BASED ALLOY HAVING HIGH THERMAL CONDUCTIVITY FOR DIE CASTING
US20210180159A1 (en) Aluminum alloy for die casting and method of manufacturing cast aluminum alloy using the same
KR101269516B1 (en) Scandium free high strength aluminum alloys for die casting
KR101181846B1 (en) High strength copper alloys for die casting
KR101780463B1 (en) Aluminium alloy composition for die casting
KR20220100292A (en) Aluminum die casting alloy having excellent formability, corrosion resistance, heat conductivity, strength
KR20220100244A (en) Aluminum die casting alloy having excellent formability, corrosion resistance, heat conductivity, strength

Legal Events

Date Code Title Description
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20191202

Year of fee payment: 4