KR20200084684A - Aluminum alloy for die casting of door lock and manufacturing method thereof - Google Patents

Abstract

The present invention relates to aluminum alloy for door lock die casting and a manufacturing method thereof. The aluminum alloy for the door lock die casting according to the present invention includes copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn), and aluminum (Al). According to the above configuration, the present invention has excellent castability and workability, and excellent physical properties such as tensile strength, yield strength, elongation, and hardness.

Description

Aluminum alloy for door lock die casting and its manufacturing method{ALUMINUM ALLOY FOR DIE CASTING OF DOOR LOCK AND MANUFACTURING METHOD THEREOF}

The present invention relates to an aluminum alloy for door lock die casting and a method of manufacturing the same, and more specifically, an aluminum alloy for door lock die casting and an excellent method of casting and processability and excellent physical properties such as tensile strength, yield strength, elongation, and hardness, and a method for manufacturing the same It is about.

Die casting is also called die casting, and can be referred to as a precision casting method of manufacturing a mold-like configuration by injecting molten metal into a mold precisely processed to match the shape of a required configuration, that is, a casting shape. Components or products produced by such die casting are also called die casting castings.

Since castings with very accurate dimensions are produced through such die casting, there is little need for a subsequent process such as surface processing. Therefore, die casting is a casting method suitable for mass production.

In general, aluminum alloy is widely used as a material for die casting. Castings made of aluminum alloys are used in a wide variety of fields, and various types of aluminum alloys are used according to each main purpose.

KSD 6006 specifies the composition of aluminum alloys for die casting. As an example, approximately 14 types of alloys are presented, and 14 types of aluminum alloys are defined from ALDC 1 to ALDC 14. Similar to the Korean standard, the American standard (AA) and the Japanese standard (JIS) also have composition ratios according to the types of aluminum alloys.

Generally, aluminum alloys for die casting include Al-Si alloys having excellent castability and Al-Mg alloys having excellent corrosion resistance. The former representative species may be referred to as ALDC 3, and the latter representative species may be referred to as ALDC 6 species.

Each aluminum alloy has its own characteristics, and accordingly, the user selects and uses an appropriate aluminum alloy type according to the application.

Each of the 14 currently defined aluminum alloys has its own characteristics. That is, it has each characteristic in terms of corrosion resistance, strength and castability. For example, certain types of alloys have excellent corrosion resistance but low castability, high corrosion resistance, but low castability. Therefore, the 14 kinds of aluminum alloys currently defined do not satisfy the required corrosion resistance, castability, and strength characteristics.

Domestic Publication No. 10-2018-0070406 (published on June 26, 2018) Domestic registered patent No. 10-1606525 (registered on March 21, 2016) Domestic registered patent No. 10-1910466 (Registered on October 19, 2018)

The present invention is to provide an aluminum alloy for door lock die casting and a method of manufacturing the excellent lockability and processability and excellent physical properties such as tensile strength, yield strength, elongation, and hardness.

The various problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

The aluminum alloy for door lock die casting according to the present invention includes copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn), and aluminum (Al).

In addition to the copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn) and aluminum (Al), silicon (Si), zinc (Zn), nickel (Ni), lead (Pb), tin (Sn) And titanium (Ti).

The copper (Cu) 0.1 to 1.0 wt%, silicon (Si) 4.0 to 6.0 wt%, magnesium (Mg) 0.1 to 0.5 wt%, zinc (Zn) 2.0 to 2.5 wt%, iron (Fe) 0.1 to 1.0 wt% , Manganese (Mn) 0.1 to 0.6 wt%, Nickel (Ni) 0.1 to 0.3 wt%, Lead (Pb) 0.05 to 0.2 wt%, Tin (Sn) 0.05 to 0.2 wt%, Titanium (Ti) 0.1 to 0.3 wt% And the weight ratio of the remaining amount of aluminum (Al).

In addition, a method of manufacturing an aluminum alloy for door lock die casting according to the present invention comprises preparing aluminum (Al) and dissolving the aluminum in a melting furnace in a temperature range of 750 to 800°C; Heating the temperature in the melting furnace in the range of 850 to 900° C., then adding and heating copper, silicon and zinc to melt the copper, silicon and zinc; Heating the temperature in the melting furnace in the range of 1000 to 1100°C, then adding iron, manganese, nickel, tin and titanium and heating to melt the iron, manganese, nickel, tin and titanium; After the temperature in the melting furnace is reduced to 700 to 750°C, magnesium and lead are added and heated to melt the magnesium and lead to prepare a melt; And producing an aluminum alloy by performing a casting process within a range of a casting temperature of 600 to 650°C and a mold temperature of 50 to 70°C using the molten liquid, wherein the aluminum alloy is copper (Cu) 0.1 to 1.0. Weight%, silicon (Si) 5.5 to 6.5%, magnesium (Mg) 0.1 to 0.5%, zinc (Zn) 2.0 to 2.5%, iron (Fe) 0.1 to 1.0%, manganese (Mn) 0.1 to 0.6 % By weight, 0.1 to 0.3% by weight of nickel (Ni), 0.05 to 0.2% by weight of lead (Pb), 0.05 to 0.2% by weight of tin (Sn), 0.1 to 0.3% by weight of titanium (Ti) and the balance of aluminum (Al) Included in weight ratio.

Specific details of other embodiments are included in the detailed description.

The aluminum alloy for door lock die casting according to the present invention has excellent castability and workability, and has excellent physical properties such as tensile strength, yield strength, elongation, and hardness.

It will be fully understood that embodiments of the technical idea of the present invention can provide various effects not specifically mentioned.

1 is a test report (TEST REPORT) of the aluminum alloy for door lock die casting manufactured according to the embodiment.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided to ensure that the disclosed contents are thorough and complete and that the spirit of the present invention is sufficiently conveyed to those skilled in the art.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present invention pertains. Terms such as those defined in a commonly used dictionary should be interpreted as having meanings consistent with meanings in the context of related technologies, and should not be interpreted as ideal or excessively formal meanings unless explicitly defined in the present application. Does not.

On the other hand, the aluminum alloy for die casting according to the present invention can be used limited to the door lock, the aluminum alloy according to the present invention can be applied to various types of known door lock die casting such as digital door lock, smart door lock.

Hereinafter, the aluminum alloy for door lock die casting according to the present invention will be described in detail.

The aluminum alloy for door lock die casting according to the present invention includes copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn), and aluminum (Al).

In addition, the door lock die-casting aluminum alloy according to the present invention, in addition to the copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn) and aluminum (Al), silicon (Si), zinc (Zn), nickel (Ni ), lead (Pb), tin (Sn), and titanium (Ti).

In addition, the aluminum alloy for door lock die casting according to the present invention is 0.1 to 1.0% by weight of copper (Cu), 4.0 to 6.0% by weight of silicon (Si), 0.1 to 0.5% by weight of magnesium (Mg), and 2.0 to 2.5% by weight of zinc (Zn). %, iron (Fe) 0.1 to 1.0 wt%, manganese (Mn) 0.1 to 0.6 wt%, nickel (Ni) 0.1 to 0.3 wt%, lead (Pb) 0.05 to 0.2 wt%, tin (Sn) 0.05 to 0.2 wt% %, titanium (Ti) 0.1 to 0.3% by weight and the remaining amount of aluminum (Al).

The copper (Cu) is included in order to improve matrix by solid solution hardening, high temperature strength improvement, and machinability (cutability).

In the present invention, the copper may contain 0.1 to 1.0% by weight of the total content of the aluminum alloy for door lock die casting. When the copper is included in less than 0.1% by weight, the effect of improving high temperature strength or improving machinability is negligible, and 1.0 wt. When included in excess of %, a problem of deteriorating corrosion resistance and deteriorating cracking resistance between heat of the aluminum alloy may occur.

The silicon (Si) is included in order to improve castability, that is, fluidity, shrinkage characteristics, hot cracking resistance, and the like, and improve thermal expansion and wear resistance and improve mechanical properties of an aluminum alloy.

In the present invention, the silicon may contain from 4.0 to 6.0% by weight of the total content of the aluminum alloy for door lock die casting. When the silicon is contained in less than 4.0% by weight, the effect of adding the silicon is minimal, and 6.0% by weight. If it is included in excess, the thermal expansion coefficient and elongation may be lowered and a problem may occur on the surface.

The magnesium (Mg) is included in order to improve corrosion resistance, increase tensile strength, improve mechanical strength, improve machinability (cutability), lower specific gravity, and improve mechanical properties by imparting heat treatment properties.

In the present invention, the magnesium may contain 0.1 to 0.5% by weight of the total content of the aluminum alloy for door lock die casting. When the magnesium is included in less than 0.1% by weight, the effect of increasing tensile strength and mechanical strength is negligible, and 0.5% by weight. When included in excess, corrosion resistance may be lowered and fluidity may be lowered, thereby causing a problem of reducing the efficiency of the die casting operation.

The zinc (Zn) is included in order to improve castability, improve mechanical properties and mechanical processability by coexistence with magnesium (Mg), and prevent formulating of an aluminum alloy.

In the present invention, the zinc may include 2.0 to 2.5% by weight of the total content of the aluminum alloy for door lock die casting. When the zinc is included in less than 2.0% by weight, a problem that it is difficult to improve mechanical properties and machinability may occur. , When included in excess of 2.5% by weight, corrosion resistance is lowered, the solidus temperature is lowered and burning may occur during heat treatment.

The iron (Fe) is used in die casting to prevent seizure in the mold and is included to prevent hot cracking of the aluminum alloy.

In the present invention, the iron may contain 0.1 to 1.0% by weight of the total content of the aluminum alloy for door lock die casting. When the iron is included in an amount of less than 0.1% by weight, it is difficult to deform the cast and prevent hot cracking, and 1.0% by weight. When included in excess of %, a problem of deteriorating corrosion resistance of the aluminum alloy may occur.

The manganese (Mn) is included to improve the high temperature strength of the aluminum alloy, prevent harmful reduction of iron (Fe) and deterioration of corrosion resistance, reduce corrosion resistance by copper (Cu), and improve castability of the aluminum alloy.

In the present invention, the manganese may contain 0.1 to 0.6% by weight of the total content of the aluminum alloy for door lock die casting. When the manganese is included in less than 0.1% by weight, it is difficult to prevent corrosion resistance and the effect of improving mechanical properties is negligible. , When included in excess of 0.6% by weight, the workability may be reduced due to adhesion, and a problem in that the properties of the aluminum alloy may be deteriorated.

The nickel (Ni) is included to improve the high temperature strength of the aluminum alloy and to improve fluidity and fillability.

In the present invention, the nickel may contain 0.1 to 0.3% by weight of the total content of the aluminum alloy for door lock die casting. When the nickel is included in less than 0.1% by weight, the effect of improving high temperature strength, fluidity, and fillability is insignificant, 0.3 When included in excess of weight%, corrosion resistance may decrease and dimensional stability may decrease due to aging delay.

The lead (Pb) is included to prevent pressure leakage of the casting and to improve heat resistance.

In the present invention, the lead may include 0.05 to 0.2% by weight of the total content of the aluminum alloy for door lock die casting. When the lead is included in less than 0.05% by weight, the effect of improving heat resistance is negligible and exceeds 0.2% by weight. If included, there may be a problem that the fluidity is lowered and the die casting operation efficiency is lowered.

The tin (Sn) is included to prevent stress corrosion cracking and heat resistance of the aluminum alloy and prevent oxidation of the aluminum alloy.

In the present invention, the tin may contain 0.05 to 0.2% by weight of the total content of the aluminum alloy for door lock die casting. When the tin is included in an amount of less than 0.05% by weight, the effect of adding tin is negligible and exceeds 0.2% by weight. When included, fluidity may decrease, internal shrinkage and pores may occur, and corrosion resistance may decrease.

The titanium (Ti) is included to refine crystal grains, improve shrinkage and mechanical properties of an aluminum alloy, and prevent hot cracking and improve heat resistance.

In the present invention, the titanium may contain 0.1 to 0.3% by weight of the total content of the aluminum alloy for door lock die casting. When the titanium is included in less than 0.1% by weight, the effect of grain refinement is minimal and the effect of improving hot cracking and heat resistance is minimal. And, if included in excess of 0.3% by weight may cause a problem of lowering the elongation.

Hereinafter, a method of manufacturing the aluminum alloy for door lock die casting according to the present invention will be described in more detail.

First, after preparing aluminum (Al), the aluminum may be dissolved in a melting furnace having a temperature range of 750 to 800°C.

When the melting temperature of the aluminum is less than 750°C, it is difficult to dissolve aluminum in a short period of time, which may cause a problem of delaying the process time. When it exceeds 800°C, the solidified structure becomes ferrite, resulting in tensile strength and hardness. It is degraded and this may cause problems that are difficult to apply to the door lock field.

Next, after heating the temperature in the melting furnace in the range of 850 to 900° C., copper, silicon, and zinc may be added and heated for a period of time to melt the copper, silicon, and zinc.

Next, after heating the temperature in the melting furnace in the range of 1000 to 1100°C, iron, manganese, nickel, tin and titanium are added and heated for a certain time to melt the iron, manganese, nickel, tin and titanium. have.

Subsequently, after the temperature in the melting furnace is reduced to a range of 700 to 750° C., magnesium and lead are added and heated for a period of time to melt the magnesium and lead to prepare a melt.

Next, an aluminum alloy may be manufactured by performing a casting process within a range of a casting temperature of 600 to 650°C and a mold temperature of 50 to 70°C using the melt.

At this time, the manufactured aluminum alloy is copper (Cu), silicon (Si), magnesium (Mg), zinc (Zn), iron (Fe), manganese (Mn), nickel (Ni), lead (Pb), tin (Sn) ), titanium (Ti) and aluminum (Al), copper (Cu) 0.1 to 1.0 wt%, silicon (Si) 4.0 to 6.0 wt%, magnesium (Mg) 0.1 to 0.5 wt%, zinc (Zn) 2.0 To 2.5 wt%, iron (Fe) 0.1 to 1.0 wt%, manganese (Mn) 0.1 to 0.6 wt%, nickel (Ni) 0.1 to 0.3 wt%, lead (Pb) 0.05 to 0.2 wt%, tin (Sn) 0.05 To 0.2% by weight, titanium (Ti) 0.1 to 0.3% by weight, and a residual amount of aluminum (Al).

Hereinafter, embodiments of the aluminum alloy for door lock die casting according to the present invention will be described in more detail with reference to the accompanying drawings.

<Example>

First, after preparing aluminum (Al), the aluminum was dissolved in a melting furnace in a temperature range of 750 to 800°C.

Next, after heating the temperature in the melting furnace in the range of 850 to 900°C, copper, silicon and zinc were added and heated for a certain time to melt the copper, silicon and zinc.

Next, after raising the temperature in the melting furnace in the range of 1000 to 1100°C, iron, manganese, nickel, tin and titanium were added and heated for a period of time to melt the iron, manganese, nickel, tin and titanium.

Subsequently, after the temperature in the melting furnace was reduced to a range of 700 to 750°C, magnesium and lead were added and heated for a period of time to melt the magnesium and lead to prepare a melt.

Next, an aluminum alloy was manufactured by performing a casting process within a range of a casting temperature of 600 to 650°C and a mold temperature of 50 to 70°C using the melt.

At this time, the alloy components input to the melting furnace are copper (Cu) 0.8 wt%, silicon (Si) 5.0 wt%, magnesium (Mg) 0.3 wt%, zinc (Zn) 2.3 wt%, iron (Fe) 0.7 wt%, manganese (Mn) 0.4% by weight, 0.2% by weight of nickel (Ni), 0.1% by weight of lead (Pb), 0.1% by weight of tin (Sn), 0.2% by weight of titanium (Ti), and a balance of aluminum (Al).

1 is a test report (TEST REPORT) of the aluminum alloy for door lock die casting manufactured according to the embodiment.

Referring to FIG. 1, the aluminum alloy for door lock die casting manufactured according to the embodiment of the present invention has a tensile strength (N/mm ² ) of 125, a yield strength (N/mm ² ) of 91, and an elongation (%). Silver 3, it can be confirmed that the aluminum alloy for door lock die casting of excellent physical properties by showing a hardness of 57 HBW 10/500.

As described above, although a preferred embodiment of the present invention has been described, those skilled in the art to which the present invention pertains understand that the present invention can be implemented in other specific forms without changing its technical spirit or essential features. Will be able to. Therefore, it should be understood that one embodiment described above is illustrative in all respects and not limiting.

Claims (4)

An aluminum alloy for door lock die casting, comprising copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn), and aluminum (Al).
According to claim 1,
In addition to the copper (Cu), magnesium (Mg), iron (Fe), manganese (Mn) and aluminum (Al), silicon (Si), zinc (Zn), nickel (Ni), lead (Pb), tin (Sn) And titanium (Ti).
According to claim 2,
The copper (Cu) 0.1 to 1.0 wt%, silicon (Si) 4.0 to 6.0 wt%, magnesium (Mg) 0.1 to 0.5 wt%, zinc (Zn) 2.0 to 2.5 wt%, iron (Fe) 0.1 to 1.0 wt% , Manganese (Mn) 0.1 to 0.6 wt%, Nickel (Ni) 0.1 to 0.3 wt%, Lead (Pb) 0.05 to 0.2 wt%, Tin (Sn) 0.05 to 0.2 wt%, Titanium (Ti) 0.1 to 0.3 wt% And aluminum alloy for door lock die casting, characterized in that included in the weight ratio of the remaining amount of aluminum (Al).
Preparing aluminum (Al) and then dissolving the aluminum in a melting furnace in a temperature range of 750 to 800°C;
Heating the temperature in the melting furnace in the range of 850 to 900° C., then adding and heating copper, silicon and zinc to melt the copper, silicon and zinc;
Heating the temperature in the melting furnace in the range of 1000 to 1100°C, then adding iron, manganese, nickel, tin and titanium and heating to melt the iron, manganese, nickel, tin and titanium;
After the temperature in the melting furnace is lowered to a range of 700 to 750° C., magnesium and lead are added and heated to melt the magnesium and lead to prepare a melt; And
Comprising the step of manufacturing the aluminum alloy by performing a casting process within the range of the casting temperature of 600 to 650 ℃ and the temperature of the mold 50 to 70 ℃ using the melt,
The aluminum alloy is copper (Cu) 0.1 to 1.0 wt%, silicon (Si) 4.0 to 6.0 wt%, magnesium (Mg) 0.1 to 0.5 wt%, zinc (Zn) 2.0 to 2.5 wt%, iron (Fe) 0.1 to 1.0 wt%, manganese (Mn) 0.1 to 0.6 wt%, nickel (Ni) 0.1 to 0.3 wt%, lead (Pb) 0.05 to 0.2 wt%, tin (Sn) 0.05 to 0.2 wt%, titanium (Ti) 0.1 to Method of manufacturing an aluminum alloy for door lock die casting, characterized in that it is included in a weight ratio of 0.3% by weight and the remaining amount of aluminum (Al).

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