KR960014947B1 - Method for regenerating scrap of mg alloy - Google Patents
Method for regenerating scrap of mg alloy Download PDFInfo
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- KR960014947B1 KR960014947B1 KR1019940014961A KR19940014961A KR960014947B1 KR 960014947 B1 KR960014947 B1 KR 960014947B1 KR 1019940014961 A KR1019940014961 A KR 1019940014961A KR 19940014961 A KR19940014961 A KR 19940014961A KR 960014947 B1 KR960014947 B1 KR 960014947B1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Extrusion Of Metal (AREA)
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Abstract
Description
제1도는 본 발명을 설명하는 개략도.1 is a schematic diagram illustrating the present invention.
제2도는 본 발명에 따른 구성도.2 is a block diagram according to the present invention.
제3도는 본 발명에 따른 제작된 빌렛의 형상을 나타내는 사진.Figure 3 is a photograph showing the shape of the billet produced according to the present invention.
제4도는 본 발명에 따라 제작된 봉재의 형상을 나타내는 사진.Figure 4 is a photograph showing the shape of the bar produced according to the present invention.
제5도는 본 발명에 따라 제작된 봉재의 인장특성표.5 is a tensile characteristic table of the bar produced according to the present invention.
제6도는 본 발명에 의하여 제작된 봉재를 광학현미경으로 본 조직사진이다.6 is a tissue photograph of the bar produced according to the present invention by optical microscopy.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
1 : 금형 2 : 빌렛1: mold 2: billet
3 : 압출금형 4 : 봉재3: extrusion mold 4: bar
본 발명은 마그네슘합금스크랩의 재활용방법에 관한 것으로, 특히 마그네슘합금스크랩를 재용해공정없이 재결정이 가능한 온도상에서 열간압출성형을 실시하여, 재사용이 가능한 일정형상의 마그네슘합금으로 제조할 수 있도록 된 마그네슘합금스크랩의 재활용방법에 관한 것이다.The present invention relates to a method for recycling magnesium alloy scrap, and in particular, magnesium alloy scrap which can be manufactured from a magnesium alloy scrap of reusable form by performing hot extrusion molding at a temperature where magnesium alloy scrap can be recrystallized without a remelting process. The recycling method of the.
일반적으로, 마그네슘합금스크랩은 가벼울 뿐만아니라, 전동·충격·전자파등에 대한 흡진성이 우수하여 자동차와 우주항공분야의 구조용재룡 및 기기부품의 기능성재료로 사용되고 있는 바, 이 마그네슘합금의 대부분(90%이상)은 다이케스팅에 의해 제조되며, 이 다이케스팅제조시에 스프류(Sprue)나, 런너(Runner), 게이트(Gate) 및. 오버플로우(Overflow)등의 스크랩이 발생되어 이의 재활용이 중요한 문제로 대두되었다.In general, magnesium alloy scrap is not only light, but also excellent in electric, shock and electromagnetic wave absorption, and is used as a functional material for structural dragons and equipment parts in automobiles and aerospace. % Or more) is manufactured by die casting, and sprue, runner, gate and. Scraps, such as overflow, have occurred and recycling of them has become an important issue.
이에 종래 마그네슘합금스크랩의 재활용방법으로는, 마그네슘합금스크랩을 수집한 후, 상기 마그네슘합금을 용융온도(651℃)이상으로 가열하여 요구되는 형상의 재활용 마그네슘합금을 제조하는 재용해에 의한 방법이 재시되고 있으나, 이러한 방법은 많은 노력과 비용을 동반함은 물로, 용해시 드로스(Dross)나 슬러지(Sluge)등 불순물이 발생되어, 회수율이 낮을 뿐만아니라, 용해 폐기물처리 등의 문제가 있었다.As a conventional method of recycling magnesium alloy scrap, a method by re-dissolution of collecting magnesium alloy scrap and then heating the magnesium alloy to a melting temperature (651 ° C.) or more to produce recycled magnesium alloy of a desired shape is re-started. However, this method is accompanied by a lot of effort and cost water, the impurities such as dross (sludge) and sludge (Sluge) is generated when dissolved, not only low recovery rate, but also had problems such as dissolution waste treatment.
이에 본 발명은 상기와 같은 제반결점을 해소하기 위해 안출된 것으로 마그네슘합금스크랩을 상온에서 가압하여 압출 잉곳(extrusion ingot)인 빌렉(Billet)으로 만든 후, 마그네슘의 재결정이 가능한 일정온도를 유지할 수 있도록 된 금형에 넣고 가열 및 압출을 실시하여 일정크기의 봉형상으로 만든 다음에, 단조 등의 가공공정을 거쳐 새로운 제품의 소재로 재활용 할수 있도록 됨으로써, 에너지절약에 따른 경비절감과 재활용효율을 높이는 동시에, 재용해서 발생되고 용해 폐기물 등을 폐지할 수 있도록 된 마그네슘합금스크랩의 재활용방법을 제공함을 그 목적이 있다.Accordingly, the present invention is made to solve the above-mentioned defects, and after pressing the magnesium alloy scrap at room temperature to make the extrusion ingot (Billet), to maintain a constant temperature capable of recrystallization of magnesium It is put into a mold and heated and extruded into a rod shape of a certain size, and then recycled into a new material through a forging process, thereby increasing energy savings and recycling efficiency. It is an object of the present invention to provide a method for recycling magnesium alloy scrap that is generated by reuse and which can dissolve molten waste.
상기와 같은 목적을 달성하기 위한 본 발명은, 마그네슘합금스크랩을 일정크기(ψ50×60mm)를 갖는 금형의 수용부에 넣은 다음 3000Mpa이상의 압력을 가하여 75∼85%의 성형밀도를 갖는 빌렛을 제조하는 빌렛제조공정과, 이 빌렛제조공정에서 만들어진 ψ50×60mm 크기의 빌렛을 압출금형에 넣은 다음, 가열 및 압출을 실시하여 직경 10mm의 재활용 마그네슘합금 봉재를 얻을 수 있도록 된 열간압출공정으로 구성된다.The present invention for achieving the above object, the magnesium alloy scrap is put in the receiving portion of the mold having a predetermined size (ψ 50 × 60mm) and then applied to the pressure of 3000Mpa or more to prepare a billet having a molding density of 75 to 85% A billet manufacturing process and a hot extrusion process in which a φ50 × 60 mm size billet made in the billet manufacturing process is put into an extrusion mold, and then heated and extruded to obtain a recycled magnesium alloy rod having a diameter of 10 mm.
또, 상기 열간압축공정은, 압출금형 및 마그네슘합금 빌렛을 마그네슘합금의 재결정이 가능한 온도(300∼380℃)로 유지시킨 다음, 620Mpa 이상의 압출압력과 13cm/min의 램속도 및 25 : 1의 압축비로 열간압출을 실시하여 직경이 10mm인 봉재를 제조하도록 된다.In the hot compression process, the extrusion mold and the magnesium alloy billet are maintained at a temperature at which the magnesium alloy can be recrystallized (300 to 380 ° C.), followed by an extrusion pressure of at least 620 Mpa, a ram speed of 13 cm / min, and a compression ratio of 25: 1. Hot extrusion is carried out to produce a rod having a diameter of 10 mm.
이하, 본 발명은 첨부된 예시도면에 의거 상세히 설명한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
제1도는 본 발명을 설명하는 개략도이고, 제2도는 본 발명에 따른 구성을 나타낸 것이며, 제3도는 빌렛제조공정에서 성형된 빌렛을 나타낸 것이고, 제4도는 열간압출공정을 거쳐 완성품공정에서 성형된 봉재형상의 재활용마그네슘합금을 나타낸 것으로 본 발명은, 마그네슘에 망간이나 알루미늄 등의 부속물을 첨가하여 용해한 후, 소정형상의 틀내에서 가열 및 가압하여 성형하도록 된 마그네슘합금의 다이케스팅등 제작공정에서 발생되는 여분의 단편(斷片) 즉, 스크랩(Scrap)을 수집하여 금형(1)의 수용부내로 삽입시키는 스크립수집공정(a)과, 상기 금형(1)의 수용부내로 삽입된 마그네슘합금스크랩을 가압·압착하여 소정크기(ψ50×60mm)를 이루는 원통형상의 빌렛(2; billet)을 제조하도록 된 빌렛제조공정(b), 이 빌렛제조공정(b)에서 형성된 빌렛(2)을 압출금형(3)내에서 가열 및 압출하여 직경 10mm인 봉재(4)를 제조하도록 된 열간압출공정(c) 및, 이 열간압출공정(c)에서 형성되는 재활용 마그네슘합금을 봉형상의 시편이나 단조 등의 가공공정을 거쳐 요구되는 제품으로 제작하도록 된 완제품공정(d)으로 이루어진다.Figure 1 is a schematic diagram illustrating the present invention, Figure 2 shows the configuration according to the present invention, Figure 3 shows a billet formed in the billet manufacturing process, Figure 4 shows a molded in the finished product process through a hot extrusion process The present invention relates to a rod-shaped recycled magnesium alloy, and the present invention relates to the production of magnesium alloy, which is formed by heating and pressurizing the magnesium alloy by adding manganese, aluminum, and other additives to the magnesium. A scrap collection process (a) for collecting scraps, that is, scraps, and inserting the scraps into the accommodating part of the mold 1, and pressing and compressing the magnesium alloy scraps inserted into the accommodating part of the mold 1; Billet manufacturing step (b) to produce a cylindrical billet (2; billet) of a predetermined size (ψ 50 × 60mm), extrusion of the billet (2) formed in the billet manufacturing step (b) The hot extrusion process (c), which is heated and extruded in the mold (3) to produce a rod 4 having a diameter of 10 mm, and the recycled magnesium alloy formed in the hot extrusion process (c) may be carried out in the form of rod-shaped specimens or forgings. It consists of a finished product process (d) to be made into the required product through the processing process.
여기서, 상기 빌렛제조공정(b)은 마그네슘의 굳기(경도; 2.6)보다 굳은 철 등의 재지리로 이루어지면서 횡방향으로 중앙부가 관통된 원통형 관형상을 이루는 그 상·하 개구부를 통해 소정유압(300Mpa이상)으로 가압하도록 된 피스톤 형상의 압착판이 삽입되어 승·하강되도록 된 ψ50×60mm 내부크기를 갖는 금형(1)내에 상기 스크랩수지공정(a)에서 수집된 스크랩이 충진된 후, 상기 금형(1)의 상·하 압착판이 유압 등에 의해 상호 밀착되면서 상기 스크랩을 75∼85%의 성형밀도를 갖으면서 일정크기(ψ50×60mm)의 원통형상을 이룬 빌렛(2)을 성형하도록 된다.Here, the billet manufacturing process (b) is made of a re-geography such as iron hardened than the hardness (hardness; 2.6) of magnesium, while forming a predetermined hydraulic pressure through its upper and lower openings forming a cylindrical tubular shape penetrating the center in the transverse direction. After the scrap collected in the scrap resin process (a) is filled into a mold 1 having a ψ50 × 60 mm inner size that is inserted into a piston-shaped pressing plate which is pressurized to 300 MPa or more), the mold ( While the upper and lower press plates of 1) are brought into close contact with each other by hydraulic pressure or the like, the billets 2 having a cylindrical shape having a predetermined size (? 50 × 60 mm) are formed while the scrap has a molding density of 75 to 85%.
또, 상기 열간압출공정(c)은 빌렛제조공정(b)에서 만들어진 ψ50×60mm 크기의 빌렛(2)이 자유롭게 삽입되도록 되는 한편, 상기 빌렛(2) 삽입부에서 반대편 선단으로 갈수록 깔대기 형상으로 개구되면서, 그 끝단부에서 직경 10mm의 개구부가 일정길이만큼 뻗어 형성된 압출금형(3)내에 상기 빌렛(2)이 삽입된 후, 외부열원에 의해 상기 압출금형(3) 및 빌렛(2)이 마그네슘합금이 재결정되는 온도(300∼380℃)로 가열·유지된 상태에서 상기 압출금형(3)의 압착판이 620Mpa이상의 압출압력과 13cm/min의 램속도로 압출금형내로 진입되면서 상기 빌렛(2)을 직경 10mm로 형성된 개구부를 통해 25 : 1의 압축비로서 압출시키도록 된다.In the hot extrusion process (c), a billet (2) having a size of 50 × 60 mm made in the billet manufacturing process (b) is freely inserted, and the opening is formed in a funnel shape toward the opposite end from the insert portion of the billet (2). While the billet (2) is inserted into the extrusion mold (3) formed at an end of which an opening having a diameter of 10 mm extends by a predetermined length, the extrusion mold (3) and the billet (2) are magnesium alloy by an external heat source. The billet 2 has a diameter as the press plate of the extruded mold 3 enters into the extruded mold at an extrusion pressure of 620 Mpa and a ram speed of 13 cm / min or more while being heated and maintained at the recrystallized temperature (300 to 380 ° C.). Extruded at a compression ratio of 25: 1 through the opening formed in 10mm.
한편, 상기 직경 10mm인 개구부가 재활용 마그네슘합금의 용도에 따라 슬릿형상이나 다각형 형상의 개구부 등으로 형성되어 상기 완제품공정(d)에서 요구되는 형상의 재활용 마그네슘합금스크랩을 얻을 수 있도록 됨을 물론이다.On the other hand, the opening of 10mm in diameter is formed of a slit-shaped or polygonal opening, etc. according to the use of the recycled magnesium alloy can be obtained to obtain a recycled magnesium alloy scrap of the shape required in the finished product process (d).
따라서, 빌렛(2) 제조공정에서 ψ50×60mm의 원통형상으로 압착되어 75∼85℃의 성형밀도를 갖도록 된 빌렛(2)이 열간압출금형(3) 내에서 마그네숨의 재결정온도(약 260℃)보다 높은 온도(마그네슘에 포함된 부속물로 인해 재결정온도 보다 높은 온도로 가령하도록 된다.) 300∼380℃의 온도로 가열되면서 마그네슘합금 결정입자의 응력이 제거되어 결정입자가 균일한 배열을 이루도록 되고, 이 결정입자의 응려이 제거되어 제6도에 나타낸 바와 같이 수지상정의 구조조직이 파괴된 상기 빌렛(2)이 620Mpa이상의 압출압력과 13cm/min의 램속도 및 25 : 1의 압축비로서 압출되면서 재결정되어, 상기 열간압출공정(c)에서 제조된 재활용 마그네슘합금의 시편인 잉곳(Ingot)은 제5도에 나타낸 바와 같이, 다이캐스팅 등의 작업으로 최초 주조된 마그네슘합금의 잉곳에 비해 인장특성치가 2∼3배 이상 증가되어 인장강도는 325Mpa로 연신율은 11%로 향상된다.Therefore, in the manufacturing process of the billet 2, the billet 2 compressed to a cylindrical shape of 50 × 60 mm and having a molding density of 75 to 85 ° C. has a recrystallization temperature of the magnet in the hot extrusion mold 3 (about 260 ° C.). Higher temperature than ((Magnesium alloy is attached to the temperature higher than the recrystallization temperature due to the accessories included, for example.) When heated to a temperature of 300 ~ 380 ℃ to remove the stress of the magnesium alloy crystal grains to form a uniform arrangement The crystals were removed by coagulation of the crystal grains, and as shown in FIG. 6, the billet 2 having the dendrite structure destroyed was extruded at an extrusion pressure of 620 Mpa or more, a ram speed of 13 cm / min, and a compression ratio of 25: 1. Ingot, which is a specimen of the recycled magnesium alloy manufactured in the hot extrusion process (c), is shown in FIG. 5, compared to the ingot of the magnesium alloy first cast by die casting or the like. The characteristic value is increased at least two to three times the tensile strength of 325Mpa is to elongation is improved to 11%.
이상 설명한 바와 같이 본 발명에 의하면, 마그네슘합금 제조시 발생되는 스크랩을 재활용하여 재활용 마그네슘합금을 제조할 수 잇음은 물론, 처리가 곤란한 마그네슘합금스크랩을 재활용공정을 거치지 않고 재활용효율을 높이는 동시에 재용해시 발생되던 용해폐기물이 없게 되는 효과가 있다.As described above, according to the present invention, it is possible to manufacture recycled magnesium alloy by recycling scrap generated during the manufacture of magnesium alloy. There is an effect that there is no dissolved waste generated.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940014961A KR960014947B1 (en) | 1994-06-28 | 1994-06-28 | Method for regenerating scrap of mg alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940014961A KR960014947B1 (en) | 1994-06-28 | 1994-06-28 | Method for regenerating scrap of mg alloy |
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| Publication Number | Publication Date |
|---|---|
| KR960001151A KR960001151A (en) | 1996-01-25 |
| KR960014947B1 true KR960014947B1 (en) | 1996-10-21 |
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| KR1019940014961A KR960014947B1 (en) | 1994-06-28 | 1994-06-28 | Method for regenerating scrap of mg alloy |
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1994
- 1994-06-28 KR KR1019940014961A patent/KR960014947B1/en not_active IP Right Cessation
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| KR960001151A (en) | 1996-01-25 |
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