KR20030020597A - Al Alloy for Injection Mold and Fabrication Method of thereof - Google Patents
Al Alloy for Injection Mold and Fabrication Method of thereof Download PDFInfo
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Abstract
Description
본 발명은 플라스틱 사출성형용 알루미늄(Al) 합금의 제조방법에 관한 것이다.The present invention relates to a method for producing an aluminum (Al) alloy for plastic injection molding.
사출성형(射出成形, Injection molding)이란 성형재료를 사출실린더 속에서 가열·용융시켜 유동성을 주고 이것을 금형 캐비티(Cavity)에 사출주입시키고 냉각, 고화 또는 경화시켜 성형품을 만드는 방법을 말하며,Injection molding refers to a method of forming a molded article by heating and melting a molding material in an injection cylinder to give fluidity, and injecting it into a mold cavity, cooling, solidifying or curing it.
종래 이러한 사출성형에 사용되는 금형의 재료로는 구리합금을 사용하였으나, 최근에는 미국, 일본 등의 선진국에서 구리와 같이 뛰어난 전기전도도와 내식성을 가지면서, 비교적 가격이 저렴하고 가벼운 알루미늄을 이용하여 강도가 향상된 알루미늄(Al) 합금을 사출금형용 재료로 사용하고 있는 추세이다.In the past, copper alloy was used as a material for the injection molding, but recently, advanced countries such as the US and Japan have excellent electrical conductivity and corrosion resistance like copper, and are relatively inexpensive and use light aluminum. Has been using improved aluminum (Al) alloys as injection mold materials.
특히 미국의 앨칸(Alcan) 회사에서는 Al-Zn-Mg계 합금에 미량원소를 첨가하여 사출금형용 재료로 사용하고 있다.In particular, Alcan company in the US adds trace elements to Al-Zn-Mg-based alloys and uses them as injection mold materials.
따라서, 본 발명은 구리합금을 대체할 수 있고 구리합금에 비해 열전도성 및 전기전도성 등의 물성이 떨어지지 않으면서 기계적 특성이 우수한 플라스틱 사출금형용 고강도 알루미늄(Al) 합금 및 그의 제조방법을 제공하는 것을 목적으로 한다.Accordingly, an object of the present invention is to provide a high-strength aluminum (Al) alloy for plastic injection mold and a method of manufacturing the same, which can replace the copper alloy and has excellent mechanical properties without inferior physical properties such as thermal conductivity and electrical conductivity compared to the copper alloy. It is done.
도 1은 본 발명에 따른 베릴륨(Be) 첨가량에 따른 경도의 변화를 나타낸다.1 shows the change in hardness according to the addition amount of beryllium (Be) according to the present invention.
도 2는 본 발명에 따른 수직형 가압장치 개략적인 구성도이다.2 is a schematic configuration diagram of a vertical pressurization device according to the present invention.
도 3은 본 발명에서의 가압력에 따른 인장강도, 연신율, 항복강도의 변화를 나타낸다.Figure 3 shows the change in tensile strength, elongation, yield strength according to the pressing force in the present invention.
***도면의 주요부분에 대한 부호의 설명****** Explanation of symbols for main parts of drawing ***
1. 상부 실린더1. Upper cylinder
2. 가열장치2. Heating device
3. 하부실린더3. Lower cylinder
4. 조작부4. Control panel
상기한 목적을 달성한 본 발명에 의하면 플라스틱 사출금형용 알루미늄(Al)합금에 있어서, Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti - 0.005~0.05wt% Be의 조성을 갖는 것을 특징으로 하는 플라스틱 사출금형용 알루미늄 합금이 제공된다.According to the present invention to achieve the above object in the aluminum (Al) alloy for plastic injection mold, Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% Ti-0.005 ~ An aluminum alloy for plastic injection mold is provided, which has a composition of 0.05 wt% Be.
또한 본 발명에 의하면 상기한 합금을 제조하기 위한 바람직한 방법으로서, 통상의 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti 합금을 제조하는 과정에서 Be를 첨가하여 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti - 0.005~0.05wt% Be의 조성을 갖는 합금을 제조하는 것을 특징으로 하는 플라스틱 사출금형용 알루미늄 합금의 제조방법이 제공된다.In addition, according to the present invention as a preferred method for producing the above-described alloy, in the process of producing a conventional Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% Ti alloy Plastic injection, characterized in that the addition of Be to prepare an alloy having a composition of Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% Ti-0.005 ~ 0.05wt% Be A method for producing an aluminum alloy for a mold is provided.
이하, 본 발명을 보다 상세하게 설명하기로 한다.Hereinafter, the present invention will be described in more detail.
본 발명의 사출금형용 알루미늄 합금은 Al-Zn-Mg-Cu-Cr-Ti-Be계 합금으로 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti - 0.005~0.05wt% Be의 조성을 갖는 것을 특징으로 한다.The aluminum alloy for injection mold of the present invention is Al-Zn-Mg-Cu-Cr-Ti-Be-based alloy Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% Ti It is characterized by having a composition of 0.005 ~ 0.05 wt% Be.
기존의 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti 합금은 구리합금에 비해 열전도성 및 전기전도성 등은 뒤떨어지지 않으나 유동성과 인장강도가 불량하여 사출금형용으로 사용하기에 부적합하나, 본 발명에 따라 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti 합금에 미량첨가 원소인 Be를 0.005~0.05wt% 첨가하게 되면 사출금형용 합금으로 매우 적합하게 된다.Conventional Al- 4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% Ti alloy is inferior in thermal conductivity and electrical conductivity to copper alloy, but has poor fluidity and tensile strength. It is not suitable for use in injection mold, but according to the present invention Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% When 0.05wt% is added, it is very suitable as an injection mold alloy.
본 발명에 있어서, 알루미늄 합금내의 베릴륨의 함량이 0.005wt% 보다 낮은 경우 연신율(elongation)이 불량하여 사출금형용으로 부적합하고, 0.05wt% 보다 높은 경우 연신율 및 인장강도(tensile strength)가 저하되어 이 또한 사출금형용으로 부적합하게 된다. 특히 베릴륨의 함량이 0.03wt%인 경우 사출금형용으로 가장 적합한 연신율 및 인장강도를 나타낸다.In the present invention, when the content of beryllium in the aluminum alloy is lower than 0.005wt%, the elongation is poor, which is not suitable for injection mold, and when it is higher than 0.05wt%, the elongation and tensile strength are lowered. It is not suitable for injection molds. In particular, when the content of beryllium is 0.03wt%, it shows the most suitable elongation and tensile strength for the injection mold.
본 발명의 합금은 금속 성분을 용해한 후에 주조, 용체화 처리(solution heat treatment) 및 시효처리(aging)하여 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti 합금을 제조하는 통상의 방법에 있어서, 상기 용해공정에서 베릴륨을 투입하여 Al-4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti 합금중 베릴륨이 0.05-0.05wt%의 양으로 함유되게 하는 것에 의해 제조할 수 있다.The alloy of the present invention is melted, melted, and then cast, solution heat treated, and aged to remove Al-4.3 wt% Zn-2.6 wt% Mg-0.7 wt% Cu-0.1 wt% Cr-0.5 In a conventional method for preparing a wt% Ti alloy, beryllium in Al-4.3 wt% Zn-2.6 wt% Mg-0.7 wt% Cu-0.1 wt% Cr-0.5 wt% Ti alloy by adding beryllium in the dissolution step. It can manufacture by making it contain in the quantity of 0.05-0.05 wt%.
본 발명에 따라 베릴륨을 첨가하면 가압주조시 용탕의 유동성과 결정입 미세화를 향상시킬 수 있으며 최종 합금의 유연성과 인장강도를 사출금형용에 적합한 정도로 향상시킬 수 있게 된다. 베릴륨은 순금속 또는 모합금 상태로 첨가할 수 있으며, 특히 모합금으로 첨가하는 것이 바람직하다.The addition of beryllium according to the present invention can improve the fluidity and grain refinement of the molten metal during press casting, and can improve the flexibility and tensile strength of the final alloy to a suitable level for injection molding. Beryllium may be added in the form of a pure metal or a master alloy, and particularly preferably added as a master alloy.
특별히 제한하기 위한 것은 아니지만 본 발명의 합금을 제조하는데 있어서, 주조과정에서 용해된 금속의 주입온도는 720℃, 금형예열온도는 200℃가 적당하다.Although not particularly limited, in the preparation of the alloy of the present invention, the injection temperature of the molten metal in the casting process is suitable for 720 ℃, the mold preheating temperature is 200 ℃.
또한, 본 발명은 용해한 금속들을 가압·주조한 후에는 490℃의 온도에서 용체화 처리(solution heat treatment)하며, 120℃의 온도에서 시효처리(aging) 하여 제조하는 것이 바람직한데, 490℃의 온도에서 용체화 처리한 후, 120℃의 온도에서시효처리하였을 경우에 가장 높은 경도를 갖기 때문이다.In the present invention, after pressing and casting the dissolved metals, solution heat treatment is performed at a temperature of 490 ° C., and aging is preferably performed at a temperature of 120 ° C., but the temperature is 490 ° C. This is because it has the highest hardness when subjected to solution treatment at and then aged at a temperature of 120 ° C.
본 발명은 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr- 0.5wt% Ti - 0.03wt% Be 조성의 알루미늄 합금을 제조하기 위하여 각 성분 금속들을 용해한 후 가압주조하는 것을 특징으로 하는데, 가압주조장치는 도 2에서 보여주는 35Φmm×150kg/cm2용량의 수직형 가압장치로서, 상부실린더(1), 가열장치(2) 및 하부실린더(3)과 이를 운전·제어하기 위한 조작부(4)를 구비한다.In the present invention, Al-4.3 wt% Zn-2.6 wt% Mg-0.7 wt% Cu-0.1 wt% Cr-0.5 wt% Ti-0.03 wt% To prepare an aluminum alloy of the composition, after melting the respective component metals and press casting The press casting device is a vertical pressurizing device having a capacity of 35 φmm × 150 kg / cm 2 as shown in FIG. 2, and the upper cylinder 1, the heating device 2, and the lower cylinder 3 and operation and control thereof. The operation part 4 for doing so is provided.
일반적으로 알루미늄 합금 사출금형을 주조할 때 용탕을 주입하는 방법으로는 중력을 이용하는 것이 보통이나, 구리합금의 열전도성 및 전기전도성 등의 고유특성에 뒤떨어지지 않는 알루미늄 합금을 제조하고, 알루미늄 합금 용탕의 유동도 향상과 주조 후의 응고상태에서 성분원소가 국부적으로 모여 불균일하게 되는 편석 현상을 억제하기 위해서는 중력주조보다는 가압주조나 고압주조법으로 제조하는 것이 본 발명의 목적에 적당하며, 가압력은 150kg/cm2일 때가 바람직하다. 이는 가압력은 150kg/cm2보다 낮거나, 150kg/cm2보다 높은 압력하에서는 연신율, 인장강도, 항복강도(yield strength)가 불량하기 때문이다.Generally, gravity is used as a method for injecting molten metal when casting an aluminum alloy injection mold, but an aluminum alloy is produced that is inferior to the intrinsic properties such as thermal conductivity and electrical conductivity of a copper alloy, and In order to improve the fluidity and suppress segregation phenomenon in which component elements are locally collected and uneven in the solidified state after casting, it is suitable for the purpose of the present invention to manufacture by pressure casting or high pressure casting rather than gravity casting, and the pressing force is 150kg / cm 2. Is preferable. This is because the pressing force is lower than 150kg / cm 2 or under 150kg / cm 2 , the elongation, tensile strength, yield strength (yield strength) is poor.
상기한 바와 같은 본 발명의 특징 및 기타의 장점은 후술되는 실시예로부터 보다 명백하게 될 것이다. 단, 본 발명이 하기 실시예로 제한되는 것은 아니다.Features and other advantages of the present invention as described above will become more apparent from the following examples. However, the present invention is not limited to the following examples.
하기의 실시예 및 비교예에서 인장강도(tensile strength), 연신율(elongation), 항복강도(yeild strength)는 인스트론 4022 인장시험기로 측정하였다.Tensile strength, elongation, and yield strength in the following examples and comparative examples were measured with an Instron 4022 tensile tester.
[실시예 및 비교예][Examples and Comparative Examples]
흑연도가니에 Al- 2.7wt% Mg과 Al- 50wt% Cu 모합금을 장입하여 고주파 용해로로 급속용해하고, 장입재들이 완전히 용해된 후 Al- 5wt% Cr과 Al- 10wt% Ti의 모합금을 장입한 후 아연(Zn)을 장입하여 용해하였다.Charge Al-2.7wt% Mg and Al-50wt% Cu mother alloy into graphite crucible and rapidly dissolve in high frequency melting furnace, and charge the mother alloy of Al-5wt% Cr and Al-10wt% Ti after the charging materials are completely dissolved. Then, zinc (Zn) was charged and dissolved.
용해된 금속들을 주입온도가 720℃이고 200℃ 온도로 예열된 금형에 주입하고 Al-4wt% Be을 첨가한 후 도 2에 나타낸 바와 같이 상부실린더(1), 가열장치(2) 및 하부실린더(3)과 이를 운전·제어하기 위한 조작부(4)를 구비하며 용량이 35Φmm×150kg/㎠인 수직형 가압장치에서 150kg/㎠의 압력을 가하여 주조하였다. 가압주조된 합금을 490℃의 온도에서 용체화 처리(solution heat treatment)를 한 후, 120℃의 온도에서 시효처리(aging)하여 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti 합금에 베릴륨이 0.005 내지 1.0wt% 함유된 수종의 알루미늄 합금을 제조하였다.The molten metals were injected into a mold preheated to a temperature of 720 ° C. and 200 ° C., and Al-4wt% Be was added. As shown in FIG. 2, the upper cylinder 1, the heating device 2, and the lower cylinder ( 3) and an operation unit 4 for driving and controlling the same, and cast at a pressure of 150 kg / cm 2 in a vertical pressurization device having a capacity of 35Φ mm × 150 kg / cm 2. The solution was treated by solution heat treatment at a temperature of 490 ° C. and then aged at 120 ° C. to give Al-4.3 wt% Zn-2.6 wt% Mg-0.7 wt% Cu- Several aluminum alloys containing 0.005 to 1.0 wt% of beryllium in a 0.1 wt% Cr-0.5 wt% Ti alloy were prepared.
알루미늄 합금내에서의 Be금속성분의 조성비에 따른 합금의 물성변화를 알아보기 위하여 각각의 합금에 대하여 인장강도(tensile strength)와 연신율(elongation)을 측정하여 도 1에 나타내었으며, 도 1에서 보여주는 바와 같이 Al- 4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr -0.5wt% Ti - 0.03wt% Be인 알루미늄 합금의 인장강도와 연신율이 가장 높음을 알 수 있었다.In order to determine the change of physical properties of the alloy according to the composition ratio of Be metal component in the aluminum alloy, tensile strength and elongation of each alloy were measured and shown in FIG. 1, as shown in FIG. 1. Likewise, Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr -0.5wt% Ti-0.03wt% Be showed the highest tensile strength and elongation.
또한, 가압주조시 가압력에 따른 물성들의 변화를 알아보기 위하여 Al-4.3wt% Zn - 2.6wt% Mg - 0.7wt% Cu - 0.1wt% Cr - 0.5wt% Ti - 0.03wt% Be 합금제조시의 가압력을 변화시켜 합금을 제조하였다.In addition, Al-4.3wt% Zn-2.6wt% Mg-0.7wt% Cu-0.1wt% Cr-0.5wt% Ti-0.03wt% Be The alloy was prepared by varying the pressing force.
가압력이 각각 0kg/cm2, 150kg/cm2, 300kg/cm2, 450kg/cm2, 600kg/cm2인 경우의 인장강도(tensile strength), 연신율(elongation), 항복강도(yeild strength)의 값을 측정하여 도 3에 나타내었으며, 도 3에서 보여주는 바와 같이 150kg/cm2일 때가 가장 좋은 물성을 보임을 알 수 있었다.Tensile strength, elongation and yield strength when the pressing force is 0kg / cm 2 , 150kg / cm 2 , 300kg / cm 2 , 450kg / cm 2 and 600kg / cm 2 , respectively 3 is shown in Figure 3, it can be seen that the best physical properties when the 150kg / cm 2 as shown in FIG.
이상 설명한 바와 같이 본 발명에 의하면 고강도의 플라스틱 사출금형용 알루미늄 합금을 고압주조에 의하여 제조하여 종전에 사출금형용으로 사용된 구리합금을 대체할 수 있게 되었을 뿐만 아니라, 물성에 있어서도 우수한 열전도성, 전기전도성, 내식성을 가지면서 비교적 저렴한 비용으로 플라스틱 사출금형용 알루미늄 합금을 생산할 수 있게 된다.As described above, according to the present invention, not only the aluminum alloy for high-mould plastic injection mold is manufactured by high pressure casting, but also to replace the copper alloy previously used for injection mould, and also excellent thermal conductivity, electrical conductivity, It is possible to produce aluminum alloy for plastic injection mold with corrosion resistance and relatively low cost.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3993476A (en) * | 1974-02-20 | 1976-11-23 | Hitachi, Ltd. | Aluminum alloy |
| JPS61170538A (en) * | 1985-01-25 | 1986-08-01 | Mitsui Alum Kogyo Kk | Aluminum alloy for casting |
| JPS61186445A (en) * | 1985-02-12 | 1986-08-20 | Riyouka Keikinzoku Kogyo Kk | Metallic mold for molding resin |
| JPS62103334A (en) * | 1985-10-29 | 1987-05-13 | Riyouka Keikinzoku Kogyo Kk | Metal-mold frame for foamed polystyrene molding |
-
2001
- 2001-09-04 KR KR1020010053980A patent/KR20030020597A/en not_active Application Discontinuation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3993476A (en) * | 1974-02-20 | 1976-11-23 | Hitachi, Ltd. | Aluminum alloy |
| JPS61170538A (en) * | 1985-01-25 | 1986-08-01 | Mitsui Alum Kogyo Kk | Aluminum alloy for casting |
| JPS61186445A (en) * | 1985-02-12 | 1986-08-20 | Riyouka Keikinzoku Kogyo Kk | Metallic mold for molding resin |
| JPS62103334A (en) * | 1985-10-29 | 1987-05-13 | Riyouka Keikinzoku Kogyo Kk | Metal-mold frame for foamed polystyrene molding |
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