KR100723630B1 - A motor vehicle air conditioner al-alloy material, manufacture method, and the air-conditioner sub-cool materials - Google Patents

Abstract

A manufacturing method of an aluminum alloy material for an automobile air conditioner is provided to manufacture an aluminum alloy material having good corrosion resistance, plasticity and machinability without damaging brazing property or weldability in a heat treatment furnace of a sub-cool material formed from an aluminum alloy, and a manufacturing method of a sub-cool material for an automobile air conditioner using an aluminum alloy material manufactured by the same is provided. A manufacturing method of an aluminum alloy material for an automobile air conditioner comprises: a first ingot melting process of charging an aluminum ingot into a melting furnace and melting the aluminum ingot within a temperature range from 660 to 800 deg.C to obtain a first ingot; a second ingot melting process of respectively adding 0.30 to 0.8 wt.% of silicon(Si), 0.30 to 0.6 wt.% of magnesium(Mg) and 0.10 to 0.3 wt.% of iron(Fe) to a first ingot melt obtained by the first ingot melting process, and secondly melting the mixed materials in a temperature range from 720 to 780 deg.C for 3 hours; an agitating process of agitating the second ingot melt; a refining and precipitating process of precipitating the melt for 30 minutes in a condition that impurities such as inclusions floating on a surface of the melt are removed after performing refining for 20 minutes by injecting a mixture of nitrogen(N2) gas and a flux into the melt to remove oxides and hydrogen(H2) contained in the agitated melt; and a casting process of maintaining the refining completed melt in a temperature range from 720 to 740 deg.C, and supplying the melt into a casting equipment, and injecting the melt into a mold to cast the melt at a casting rate of 120 mm/min.

Description

A method of manufacturing aluminum alloy materials for automotive air conditioners and a method of manufacturing sub-cooling materials for automobile air conditioners using the aluminum alloy materials manufactured therefrom {A motor vehicle air conditioner Al-alloy material, manufacture method, and the air-conditioner sub-cool materials}

1 is a photograph of the relationship between the cold working rate using the aluminum alloy material according to the present invention and the alloy material metal structure according to the present invention,

Figure 2 is a photograph taken by comparing the cold processing rate 4.5% ash and 0% ash after shaft processing and heat treatment of the cold working material.

The present invention relates to a method for manufacturing an aluminum alloy material for automotive air conditioners and a method for manufacturing a subcooling material for automobile air conditioners using the aluminum alloy material produced therefrom.

In general, a vehicle is a passage for moving fluids, and a plurality of pipe lines such as metal tubes or hydraulic hoses are used. An air conditioning line for moving refrigerant, a fuel line for delivering fuel, and a hydraulic oil for conveying hydraulic oil are used. It is well known that there are (Power streering) lines and brake lines.

Currently, most automotive piping lines are made of metal tubes, except for those requiring flexibility for vibration reasons. Especially, aluminum tubes are used for air conditioning lines and related piping parts and various metal fittings. .

In particular, this aluminum alloy is applied to automotive air conditioners. It is excellent in corrosion resistance and plastic workability. It has Al-Mn-based alloy A3003, which is used for fin materials and piping, and has proper extrudability, and fine precipitates are formed after aging heat treatment to increase strength. Al-Mg-Si-based alloys A6063, A6005, A6061, etc., which have an effect, have been mainly used.

Using these alloy types, each individual part constituting the air conditioner system of the automobile is assembled after plastic working or machining, and then the air conditioner system of the automobile completed by welding or the like is implemented.

When the air conditioner system of the automobile is implemented as described above, the joining can be roughly divided into furnace welding, which does not use a heat treatment furnace, and furnace welding, which uses a heat treatment furnace. The main body of the heat exchanger is a fin material and a brazing process. It becomes very important, and it is common to perform vacuum welding in a heat treatment furnace to increase brazing property.

In particular, the sub-cooling part that forms part of the air conditioner system of the automobile air conditioner is used as a pressure resistant container for purifying the refrigerant liquid supplied from the condenser body, and it is required to be used as a high strength material having high internal pressure strength. The cold forged product processed by the material, such as A6005 which is said Al-Mg-Si type | system | group, A6061, etc. is used.

The sub-cooling parts are joined to the condenser body, which forms part of the air-conditioning system, by brazing. After brazing and brazing, the Mg added to the sub-cooling is evaporated and diffused during the heat treatment. This contaminates the inside of the furnace and lowers the degree of vacuum, thereby weakening the brazing property, which makes it difficult to perform simultaneous processing.

In addition, since the hydrogen gas contained in the material expands during heat treatment and causes bubbles or pinholes, it is difficult to prevent bubbles and peel holes from being generated by the hydrogen gas. Therefore, there is a need to reduce the phenomenon as much as possible. It is increasing.

Accordingly, the present invention has been made to solve the above-mentioned problems, and the like, a subcooled material made of aluminum alloy which is one of high strength materials such as a condenser main body and refrigerant device parts, piping, and various metal fittings applied to an air conditioner system such as an automobile It is an object of the present invention to provide an aluminum alloy material having good corrosion resistance, plasticity, and machinability without impairing the furnace heat treatment and brazing property.

Another object of the present invention is to provide an aluminum alloy material having superior weldability and substantially improved strength in a welded state as compared with a conventional aluminum alloy included in an Al-Mg-Si system.

The present invention for achieving the above object,
Primary ingot dissolving step of charging the required amount of aluminum ingot (99.7% Al) into the melting furnace to dissolve at a temperature of 660 ~ 800 ℃ to obtain the primary ingot;
As the molten metal of the primary ingot obtained by the primary ingot dissolution step, the alloying elements of silicon (Si) 0.30 to 0.8 wt%, magnesium (Mg) 0.30 to 0.6 wt%, and iron (Fe) 0.10 to 0.3 wt% Respectively, by adding a secondary ingot dissolution step of dissolving for 2 hours in the temperature range of 720 ~ 780 ℃,
Stirring the second ingot melt;
Impurities such as inclusions floating on the surface of the molten metal after being refined for 20 minutes by injecting a mixed gas containing a flux of nitrogen (N ₂ ) gas into the molten metal to remove oxides and hydrogen (H ₂ ) contained in the stirred molten metal Refining and sedimentation process to precipitate the molten metal in the state of removing the
Maintaining a temperature range of 720 ~ 740 ℃ of the molten metal after the refining and sedimentation process and is supplied to the casting apparatus to be injected into the mold at a casting rate of 120 mm / min, the casting air conditioning Provided is an aluminum alloy material manufacturing method.

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In addition, the present invention, in the second ingot dissolution step, at least one copper (Cu) 0.02 ~ 0.2 wt%, chromium (Cr) 0.02 ~ 0.1 wt%, manganese (Mn) 0.02 ~ 0.5 wt% It provides an aluminum alloy material manufacturing method comprising agitation by using a stirring jig so as to homogenize the alloying component after the second melt for 3 hours in the temperature range of 720 ~ 780 ℃ by the same method.

The present invention also rotates in an argon inert gas atmosphere and allows gas bubbles to be evenly injected into the molten metal to facilitate removal of hydrogen (H ₂ ) and floating inclusions in the molten metal, and thus for the treatment of degassing (H ₂ ). It provides a method for producing an aluminum alloy material comprising supplying 0.005 ~ 0.10 wt% of titanium (Ti) in the molten metal to refine the ingot structure in the process.

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In addition, the present invention, using the aluminum alloy material obtained by the above-described method for producing an aluminum alloy material, after performing a heat treatment for 8 hours at 580 ℃, and preheated to a temperature of about 500 ℃ 8% to 15% cold Provided is a method for producing a sub-cooling material for an automotive air conditioner, which is subjected to a heat treatment for 1 to 12 Hr at 120 to 300 ° C. after cold drawing extrusion by processing rate.

The present invention is to provide an alloy material for manufacturing aluminum tubes for excellent welding efficiency in the aluminum tube applied to the automotive air conditioner system and the air conditioner condenser bonded thereto by the present applicant, it is possible to increase the strength and phenomenon such as distortion It is possible to manufacture the aluminum tube to be bonded to the air conditioner condenser of the automobile by adding and casting the additive element adopted in the embodiment of the present invention to the Al-Mg-Si-based alloy, which is attracting attention as an automotive component material due to its resistance to A method of manufacturing an aluminum alloy material for an automotive air conditioner may be obtained, and a method for manufacturing an automotive air conditioner subcooling material may be obtained using the aluminum alloy material for an automotive air conditioner obtained by the method for manufacturing an aluminum alloy material for an automotive air conditioner. .

First, prior to the description of the present invention, the alloy material to be employed in the present invention will be described.
Aluminum alloy material that can be applied to the present invention, the Al-Mg-Si-based alloy as a main component of the aluminum alloy prepared by adding silicon (Si), magnesium (Mg), iron (Fe), titanium (Ti) By obtaining the drawing tube, it is possible to attach to the body of the condenser body of an automobile air conditioner, and then allow vacuum furnace welding in a heat treatment furnace.

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In order to obtain the alloying material of the present invention having such characteristics, each alloying component is quantified to a predetermined amount satisfying the alloying composition of the present invention as described above and dissolved in the melting furnace.

First, describing the components of the aluminum alloy material that can be adopted in the present invention,

Al _a - Si _b - Mg _c - Fe _d - Ti _e -X

Where a, b, c, d are all atomic percent, silicon (Si) "b = 0.30 to 0.8 wt%", magnesium (Mg) "c = 0.30 to 0.6 wt%", iron (Fe) "d = 0.10 to 0.3 wt% ", titanium (Ti)" e = 0.005 to 0.10 wt% "by adding an element added to the base metal aluminum (Al) of the remaining amount," X "in the casting process Traces of other elements and impurities added.

Silicon (Si) is an essential element to improve the strength that is the basis of this alloy by producing Mg ₂ Si compound simultaneously with magnesium (Mg). As a pressure resistant container having a function of purifying, it is preferable to have a pressure resistance, so that a sufficiently high strength is required.

Therefore, it is understood that if the amount of Si is small, sufficient strength cannot be obtained, and if the amount of Si is too high, it is preferable to be present in silicon (Si) in the range of 0.30 to 0.8 wt%, because the extrusion process, the cold shaft tube, and the forging processability are deteriorated. Could.

On the other hand, the added element magnesium (Mg) is to be added for the same purpose as the above-described silicon (Si), in combination with silicon (Si) to provide a basic strength to the alloy according to the present invention, the magnesium (Mg) is There is a possibility of contaminating the inside of the furnace by evaporating the furnace contents to reduce the degree of vacuum, which may adversely affect the furnace bonding or brazing performance, and when the content exceeds 1.0 wt%, the extrusion performance may also be deteriorated. Therefore, it is desirable to minimize the addition amount as long as there is no problem in strength. In the present invention, the addition amount of magnesium (Mg) is limited to 0.30 to 0.6 wt%.

In addition, in the case of iron (Fe) to be adopted in the present invention, the metal is effective to refine the cast structure and to refine the crystal grains of the extruded material structure, and is added for the purpose of improving the material structure.

Such iron (Fe) forms an Al-Fe-Mn compound when the manganese (Mn) is added to limit the beneficial effect, if the addition amount of iron (Fe) is more than 0.5 wt% of the weld joint of the alloy of the present invention Since the fatigue life is reduced, the microstructure of the material structure satisfies the performance requirements as the post-processing and final parts. The small amount of the additive is fine and the addition of the above-mentioned problems and crystallization increases in a large amount. The cold workability in forging and the like is reduced, and in the present invention, it is preferable to limit the amount of iron (Fe) added within the range of 0.10 to 0.3 wt%.

In addition, titanium (Ti) added as an alloying element of the present invention plays an important role as a grain refiner when solidifying ingots and welded joints produced using the alloy of the present invention. When it is combined with zirconium (Zr) among fine other elements among the alloying elements, it may form undesirable coarse primary particles, which need to be avoided. When added in a large amount, the formability during cold working as an unemployed inclusion There is a disadvantage of alienating the bar, in the present invention, the amount of titanium (Ti) added is limited to within the range of 0.005 to 0.10 wt%.

In addition, titanium (Ti) may be added with Al-Ti or with Al-Ti-B. In either case, titanium (Ti) exhibits good properties and can be combined with each other.

Therefore, the above-described additive elements, silicon (Si), magnesium (Mg), iron (Fe) and titanium (Ti), are added to aluminum (Al) in the above-described addition ratios, respectively, and the alloying material targeted in the present invention. Can be obtained.

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Meanwhile, other elements may be added in addition to each of the additional elements according to the above embodiments, and may be performed by adding one or more elements of copper (Cu), chromium (Cr), and manganese (Mn).

In the case of copper (Cu), when a large amount is added as an effective element to improve strength, the corrosion resistance and extrusion processability are lowered. When the amount is added in small amounts, the effect of strength improvement cannot be expected. Since it is effective to improve the corrosion resistance, in consideration of the airtightness and extension of the corrosion resistance required for the intended use, the most suitable addition range in the present invention was limited to within the range of 0.02 ~ 0.2 wt%.

In addition, in the case of chromium (Cr) and manganese (Mn) is added to improve the corrosion resistance and at the same time to fine-tune the material structure after extrusion, when the addition amount is large, the extrusion processability is lowered, making it difficult to apply to a material with a large extrusion ratio When adding a small amount, the compounding effect can be expected to be combined, so that the effective range of each element is added within 0.02 to 0.1 wt% for chromium (Cr) and 0.02 to 0.5 wt% for manganese (Mn). .

Hereinafter, a method for producing an aluminum alloy material to be obtained in the present invention by adding each of the alloying elements described above using aluminum (Al) as a base metal will be described.

The present invention to manufacture an aluminum alloy material as described above,

A primary ingot melting process in which a required amount of aluminum ingot (99.7% Al) is charged to a melting furnace and dissolved within a temperature of 660 to 800 ° C. to obtain a primary ingot;

As the molten metal of the primary ingot obtained by the primary ingot dissolution step, the alloying elements of silicon (Si) 0.30 to 0.8 wt%, magnesium (Mg) 0.30 to 0.6 wt%, and iron (Fe) 0.10 to 0.3 wt% 2nd ingot dissolving step to dissolve at a temperature range of 720 ~ 780 ℃ for 2 hours by adding each,

Stirring the second ingot melt;

Impurities such as inclusions floating on the surface of the molten metal after being refined for 20 minutes by injecting a mixed gas containing a flux of nitrogen (N ₂ ) gas into the molten metal to remove oxides and hydrogen (H ₂ ) contained in the stirred molten metal Refining and sedimentation process to precipitate the molten metal in the state of removing the

Through the refining and sedimentation process to maintain the temperature range of 720 ~ 740 ℃ of the refining is completed, the molten metal is supplied to the casting device is made of a casting process that is injected and cast at a rate of 120 mm / min in the mold.

-Primary Ingot Melting Process-

First, the required amount of aluminum ingot (99.7% Al) is charged to 8Ton scale furnace for heavy oil combustion heating reflection to dissolve the ingot at a temperature of 660-800 ° C.

-Second Ingot Melting Process and Stirring Process-

In this manner, the molten aluminum ingot melted firstly was added with the alloying elements of silicon (Si) 0.30 to 0.8 wt%, magnesium (Mg) 0.30 to 0.6 wt%, and iron (Fe) 0.10 to 0.3 wt%, respectively. The secondary solution is dissolved for about 3 hours in the temperature range of 780 ℃.

Then, the molten metal is stirred using a stirring jig such that the alloying component obtained by secondary dissolution is uniformized.

On the other hand, with addition of the element alloy described above, one of the elliptical elements copper (Cu) 0.02 ~ 0.2 wt%, chromium (Cr) 0.02 ~ 0.1 wt%, manganese (Mn) 0.02 ~ 0.5 wt% Or more than that, by adding the same time at the same time by dissolving the secondary solution for about 3 hours in the temperature range of 720 ~ 780 ℃ by stirring the molten metal using a stirring jig to homogenize the alloying components.

-Refining and Sedimentation Process-

Next, in order to remove oxides and hydrogen (H ₂ ) contained in the stirred molten metal, a mixed gas in which flux is added to nitrogen (N ₂ ) gas is injected into the molten metal, followed by scouring for 20 minutes, and then inclusions floating on the surface of the molten metal. The molten metal is precipitated for 30 minutes in the state where impurities such as these are removed.

Thus, the molten molten metal is maintained in the temperature range of 720 ~ 740 ℃ and the molten metal is supplied to the casting apparatus is injected and cast into the mold.

The casting speed was set to 120 mm / min. In the casting process, aluminum may absorb or oxidize water. The amount of hydrogen (H ₂ ) in the molten metal contains about 0.3 to 1.0 cc / 100 mmgAl, and the content is always constant. If the hydrogen (H ₂ ) is 0.5 cc or more, it is difficult to maintain it, and pinholes or bubbles are easily generated during the extrusion process and subsequent heat treatment. Therefore, degassing is performed by an external furnace refining apparatus provided at an intermediate point of the casting passage. It is preferable to perform a deintercalation treatment.

Here, the treatment of degassing (H ₂ ) may be possible to remove hydrogen (H ₂ ) and floating inclusions in the molten metal by rotating in an argon inert gas atmosphere and allowing bubbles of gas to be evenly injected into the molten metal.

In addition, since the alloy element titanium (Ti), which is not added to the first aluminum (Al), is required for miniaturization of the ingot structure, it is preferable to be supplied into the molten metal at the center of the degassing apparatus by Al-Ti-B Rod.

In particular, the general aluminum alloy material that does not pass through the degassing device had a residual amount of hydrogen (H) of 0.35 ~ 0.71 cc / 100mmg Al, but in any case, the alloy material of the present invention is reduced to less than 1/2 in any case, high degassing efficiency Could confirm.

In addition, the addition of iron (Fe) or titanium (Ti), the ingot structure can be confirmed that the addition effect is refined when compared with the general aluminum alloy material (comparative material).

Table 1 is a table showing the ingot characteristics comparing the amount of ingot gas (H ₂ ) between the conventional alloy of the general aluminum alloy material and the alloy material according to the present invention.

<Table 1>

 NO Chemical composition (wt%) Ingot gas (H ₂ ) volume Ingot tissue  Remarks Si Fe Cu Mn Mg Cr Zn Ti One 0.10 0.42 0.12 1.06 0.02 0.01 0.01 0.004 0.55 Decisive Conventional Alloy (3003) 2 0.83 0.08 0.00 0.01 0.70 0.00 0.00 0.005 0.71 Decisive Conventional Alloy (6005) 3 0.80 0.09 0.01 0.01 0.68 0.00 0.01 0.008 0.68 Decisive Conventional Alloy (6005) 4 0.76 0.15 0.00 0.00 0.57 0.00 0.01 0.006 0.19 Deciding Invention Alloy-1 5 0.32 0.30 0.00 0.00 0.31 0.01 0.00 0.012 0.21 Deciding Invention Alloy-1 6 0.55 0.34 0.00 0.00 0.35 0.00 0.01 0.078 0.18 Crystal Invention Alloy-1 7 0.68 0.24 0.01 0.00 0.40 0.00 0.01 0.030 0.15 Crystal Invention Alloy-1 8 0.78 0.27 0.00 0.03 0.54 0.07 0.00 0.025 0.20 Crystal Invention Alloy-2 9 0.60 0.20 0.15 0.05 0.40 0.02 0.00 0.050 0.15 Crystal Invention Alloy-2 10 0.57 0.20 0.06 0.45 0.50 0.05 0.01 0.070 0.18 Crystal Invention Alloy-2

     ※ amount of ingot gas (H); cc / 100mg Al (measured by hydrogen test)

As shown in the table it can be seen that the amount of ingot gas in the casting process using the conventional alloy is generated more than the amount of ingot gas in the casting process using the alloying material provided by the present invention.

As described above, hydrogen is formed during the extrusion process of the product by the micropores of hydrogen (H ₂ ) generated during the casting of the existing aluminum alloy in the form of a defect in the interior of the product. (H ₂ ) The aluminum alloy provided by the present invention has a problem in that the gas is coagulated and expanded, resulting in defects in air bubbles or pinholes, and in the target application where airtightness such as a piping material applied to an automobile air conditioning system is extremely required. It can be solved by using the material, and also it can cause the bad effect such as poor bonding with other parts and especially the vacuum degree at the same time as Mg etc., so as to reduce the absorption of hydrogen in the aluminum molten metal as much as possible or absorb the hydrogen It is important to degassing the aluminum sums provided by the present invention. If the material can be seen in the characteristics of the ingot in Table 1 meets these requirements.

On the other hand, using the aluminum alloy material of the present invention obtained in this way will be described a process for producing a pipe material for the automotive air conditioner, that is, a sub-cooling material for the automotive air conditioner.

In order to remove the residual stress in the ingot and homogenize the ingot segregation by the method as described above, heat treatment was performed at 580 ° C. for 8 hours, and then cooled at room temperature, and then short cut by an extrusion billet or the like. It is preferable to preheat and extrude at the temperature of ° C.

As the extruded pipe is subjected to drawing processing, if the drawing processing rate is low, the product structure may coarsen after the final welding processing of the sub-cooling material and the material properties such as corrosion resistance and strength may be damaged. It is necessary to perform shaft tube processing to make the crystal grains uniform and refined.

This is because, as shown in FIG. 1, a portion having a low processing rate during shaft machining at a drawing rate of 0% has coarsened crystal structure, and as shown in FIG. 2, a processing rate of less than about 8% is shown in FIG. It was confirmed that it was.

However, as a result of the shaft tube processing using 4.5% of the drawing processing rate, it was found that the crystal grains as shown in FIG. 1 can be uniform and refined. This is the basis for judging that the sum of drawing processing rate and tube processing rate was more than 8%, and the total processing rate in cold must be at least 8% until the product becomes a product in order to obtain micro-uniform product quality. It can be seen that.

In the present invention, it is judged that a processing rate of 15% or more is preferable in order to absorb the deviation of the extrusion dimension precision and to increase the precision of the drawing tube.

Table 2 is a table showing the characteristics of the extruded material by the above extrusion conditions, that is, 15% processing rate using the alloy material of the present invention, the conventional physical properties when extruded under the same conditions using the alloy material of the present invention It can be seen that the significantly improved effect than the extruded material using the general aluminum alloy material.

<Table 2> Properties of Extrusion Alloys

 NO Chemical composition  Formability  Machinability  Weldability  Corrosion resistance Grain size (after heating 600 ℃ x30 minutes)  Remarks Tensile (N / ㎡) Yield (N / ㎡) Elongation (%) One 105 95 12.0 ○ X (defect) ○ ○ Deciding Conventional Alloy (3003) 2 263 249 6.5 X (refractive) ○ X (poor bonding) ○ Crystal Conventional Alloy (6005) 3 264 247 6.0 X (refractive) ○ X (poor bonding) ○ Crystal Conventional Alloy (6005) 4 258 239 7.5 △ ○ △ ○ Crystal Invention Alloy-1 5 209 183 13.0 ○ ○ ○ ○ Crystal Invention Alloy-1 6 215 193 10.5 ○ ○ ○ ○ Crystal Invention Alloy-1 7 228 204 10.0 ○ ○ ○ ○ Crystal Invention Alloy-1 8 256 237 8.0 △ ○ △ ○ Crystal Invention Alloy-2 9 232 208 10.0 ○ ○ ○ ○ Crystal Invention Alloy-2 10 250 231 8.5 ○ ○ △ ○ Crystal Invention Alloy-2

※ The test material is heat-treated at 140 ℃ X 4 Hr after drawing process at 15% processing rate after extrusion.

As such, when the drawing process is performed, work hardening of the material itself occurs, and as a result, the molding processability is lowered to obtain a predetermined dimensional shape, and a problem such as a work crack or a material crushing phenomenon may be derived.

Therefore, it is important to improve the formability of the drawn material, and as a result of tracking the heat treatment conditions in the present invention, as shown in Table 3, when the heat treatment is performed for 1 to 12 Hr under the conditions of 120 to 300 ℃, It was confirmed that the softening can improve the moldability.

In addition, if it exceeds 300 ℃, the moldability is good, but the strength is reduced, so the heat treatment conditions using the aluminum alloy material according to the present invention may be a heat treatment condition for 1 to 12 hours at 250 ~ 300 ℃, for this The target material was set to 1 to 4 hours at a temperature of 300 ° C.

<Table 3> Table showing relationship between heat treatment condition and various characteristics

 NO  Heat treatment condition Mechanical properties  Formability Grain size (after heating at 600 ℃ x 30 minutes) Tensile (N / ㎡) Yield (N / ㎡) Elongation (%) One Specific heat treatment 213 212 4.0 X ○ (fine) 2 120 ℃ X 2 Hr X 8 Hr 215 218 205 209 5.0 6.5 X X ~ △ ○ (fine) ○ (fine) 3 140 ℃ X 2 Hr X 8 Hr X 12 Hr 224 233 237 198 214 218 8.5 7.0 7.0 △ X ~ △ X ~ △ ○ (fine) ○ (fine) ○ (fine) 4 200 ℃ X 2 Hr X 4 Hr 220 218 207 209 8.5 8.0 △ △ ○ (fine) ○ (fine) 5 220 ℃ X 2 Hr X 4 Hr 216 207 210 200 8.5 8.5 △ △ ○ (fine) ○ (fine) 6 280 ℃ X 2 Hr X 4 Hr 176 170 157 151 11.5 12.0 ○ ○ ○ (fine) ○ (fine) 7 300 ℃ X 2 Hr X 4 Hr 153 150 129 127 12.5 13.0 ○ ○ ○ (fine) ○ (fine) 8 350 ℃ X 2 Hr 121 76 15.5 ○ ○ (fine)

※ formability evaluation; X-Refractive Table

                 △-refraction

                 ○-refraction

※ The heat-treated blank alloy was 15% after extrusion using No 7 material shown in Table 1.

   Cold drawn and heat treated.

Subcool parts made of the alloying material of the present invention having good formability by attaching to the air conditioner condenser devices such as automobiles by using the subcooled parts material such as the extruded material obtained in this way and then allowing the vacuum furnace welding treatment in the heat treatment furnace. The ash allows for vacuum furnace welding in a heat treatment furnace.

As described above, as the sub-cooling material used in various parts such as piping materials applied to automobile air conditioning systems that can be applied to aluminum alloy by using the alloy material of the present invention, post-processing can be excluded and sufficient airtightness can be secured. In addition, the incidence rate of the product function is significantly lowered, and the product satisfaction and the possibility of mass production of the product can be sufficiently secured.

Therefore, according to the present invention, by providing an aluminum alloy material that is adopted to be used in refrigerant equipment parts, such as automotive air conditioners, piping and various metal fittings, etc., the weldability and formability of the extruded material is excellent in the drawing process using the same. By using the properties, it is possible to weld the vacuum furnace in the state of being attached to the automotive air conditioner condenser in the heat treatment furnace, thereby reducing the cost of processing, air shortening, material cost, and the like, which makes post-processing unnecessary as in the prior art. You can expect.

Claims (6)

A primary ingot melting process in which a required amount of aluminum ingot (99.7% Al) is charged to a melting furnace and dissolved within a temperature of 660 to 800 ° C. to obtain a primary ingot; As the molten metal of the primary ingot obtained by the primary ingot dissolution step, the alloying elements of silicon (Si) 0.30 to 0.8 wt%, magnesium (Mg) 0.30 to 0.6 wt%, and iron (Fe) 0.10 to 0.3 wt% Respectively, by adding a secondary ingot dissolution step of dissolving for 2 hours in the temperature range of 720 ~ 780 ℃, Stirring the second ingot melt; Impurities such as inclusions floating on the surface of the molten metal after being refined for 20 minutes by injecting a mixed gas containing a flux of nitrogen (N ₂ ) gas into the molten metal to remove oxides and hydrogen (H ₂ ) contained in the stirred molten metal Refining and sedimentation process to precipitate the molten metal in the state of removing the Maintaining a temperature range of 720 ~ 740 ℃ of the molten metal after the refining and sedimentation process and is supplied to the casting apparatus to be injected into the mold at a casting rate of 120 mm / min, the casting air conditioning Aluminum alloy material manufacturing method. The method of claim 1, In the second ingot dissolution step, the copper (Cu) 0.02 ~ 0.2 wt%, chromium (Cr) 0.02 ~ 0.1 wt%, manganese (Mn) 0.02 ~ 0.5 wt% by selecting one or more, simultaneously added in the same manner Method of manufacturing an aluminum alloy material for a car air conditioner comprising agitating the molten metal using a stirring jig so as to uniformly dissolve after alloying for 2 hours in a temperature range of 720 ~ 780 ℃. The method of claim 1, In the casting process for the treatment of degassing (H ₂ ) in order to facilitate the removal of hydrogen (H ₂ ) and floating inclusions in the molten metal by rotating in an argon inert gas atmosphere and allowing gas bubbles to be evenly injected into the molten metal. Method for producing an aluminum alloy material for automotive air conditioning comprising supplying 0.005 ~ 0.10 wt% of titanium (Ti) in the molten metal for miniaturization. Using the aluminum alloy material for automotive air conditioner manufactured by any one of the manufacturing method of the aluminum alloy material for automobile air conditioner according to claim 1, the heat treatment for 8 hours at 580 ℃, and then preheated to a temperature of 500 ℃ After the cold drawing extrusion by the cold working rate of 8% to 15% by the heat treatment for 1 ~ 12 Hr at 120 ~ 300 ℃ conditions. delete delete

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