KR20060021965A - Method for manufacturing aluminium lower arm of vehicle - Google Patents
Method for manufacturing aluminium lower arm of vehicle Download PDFInfo
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- KR20060021965A KR20060021965A KR1020040070696A KR20040070696A KR20060021965A KR 20060021965 A KR20060021965 A KR 20060021965A KR 1020040070696 A KR1020040070696 A KR 1020040070696A KR 20040070696 A KR20040070696 A KR 20040070696A KR 20060021965 A KR20060021965 A KR 20060021965A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
- B21J1/06—Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K7/00—Making railway appurtenances; Making vehicle parts
- B21K7/12—Making railway appurtenances; Making vehicle parts parts for locomotives or vehicles, e.g. frames, underframes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
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Abstract
본 발명은 자동차용 알루미늄 로워암 제조 방법에 관한 것으로서, 더욱 상세하게는 기존의 알루미늄 열간단조 로워암에 비해 제조비는 저가이면서 물성은 알루미늄 열간단조품에 상응하는 새로운 성형공법을 제공하고자 한 것이다.The present invention relates to a method for manufacturing aluminum lower arms for automobiles, and more particularly, to provide a new molding method corresponding to aluminum hot forged products, while having a low manufacturing cost and physical properties compared to conventional aluminum hot forged lower arms.
이를 위해, 본 발명은 자동차용 알루미늄 로워암 제조 방법에 있어서, 반응고 성형장비를 이용하여 A356합금 용탕의 주입후, 냉각하여 슬러리를 제조한 다음, 제조된 슬러리를 프리폼 금형에 사출장비를 이용하여 사출하여 이루어지는 반응고 성형을 이용한 실형상 알루미늄 로워암 프리폼 제작 단계와; 제조된 프리폼을 단조를 위해 연속가열로에서 460∼480℃ 의 온도로 가열하는 단계와; 가열된 프리폼을 에어햄머 단조기를 이용하여 단 1회 단조하는 단계와; 단조 완료된 프리폼을 1번의 트리밍으로 최종 로워암 형상을 얻어 가공 조립할 수 있도록 한 단계를 포함하여 이루어지는 것을 특징으로 하는 자동차용 알루미늄 로워암 제조 방법을 제공한다.To this end, the present invention is a method for manufacturing aluminum lower arm for automobiles, after injection of molten A356 alloy using a reaction high-molding equipment, and then cooled to prepare a slurry, using the injection equipment to the preform mold using the injection equipment A step of producing a solid aluminum lower arm preform using reaction solid molding formed by injection; Heating the prepared preform at a temperature of 460-480 ° C. in a continuous heating furnace for forging; Forging the heated preform only once using an air hammer forging machine; It provides a method for manufacturing an aluminum lower arm for automobiles, characterized in that it comprises one step to obtain a final lower arm shape by a single trimming the forged preform.
알루미늄 로워암, 프리폼, 반응고성형, 회수율Aluminum Lower Arm, Preform, Reaction Molding, Recovery
Description
도 1은 본 발명에 따른 알루미늄 로워암의 제조 방법을 설명하는 공정도,1 is a process chart for explaining a method for producing an aluminum lower arm according to the present invention;
도 2는 종래의 열간단조공법을 이용한 알루미늄 로워암의 제조 방법을 나타내는 공정도.2 is a process chart showing a method for producing an aluminum lower arm using a conventional hot forging method.
본 발명은 자동차용 알루미늄 로워암 제조 방법에 관한 것으로서, 더욱 상세하게는 기존의 알루미늄 열간단조 로워암에 비해 제조비는 저가이면서 물성은 알루미늄 열간단조품에 상응하는 새로운 성형공법을 제공하고자 한 것으로서, 반응고성형을 이용한 실제 형상의 알루미늄 로워암의 프리폼 제조 단계와, 제조된 프리폼을 이용한 1회 단조 및 트리밍 단계 그리고 마지막으로 가공 조립단계로 이루어지는 자동차용 알루미늄 로워암 제조 방법에 관한 것이다.The present invention relates to a method for manufacturing aluminum lower arms for automobiles, and more particularly, to provide a new molding method corresponding to aluminum hot forged products, which is cheaper in manufacturing cost and physical properties than conventional aluminum hot forged lower arms. It relates to a preform manufacturing step of the actual shape aluminum lower arm by using a molding, a forging and trimming step using a manufactured preform, and finally a manufacturing method of aluminum lower arm for automobile.
자동차용 로워암은 조향 및 현가장치를 구성하는 부품중 하나로서, 바퀴 (wheel)가 달려있는 축을 차체와 고정시켜주는 역할을 한다.The lower arm for automobile is one of the components that make up the steering and suspension system, and serves to fix the shaft on which the wheel is attached to the vehicle body.
이러한 로워암은 스틸단조품 또는 스틸프레스품으로 제작되어 왔으나, 현재 경량화 등을 고려하여 알루미늄을 이용하여 제작되고 있다. These lower arms have been manufactured from steel forgings or steel presses, but are currently manufactured using aluminum in consideration of weight reduction.
알루미늄 로워암의 제조방법은 여러가지 방법이 있으나 가장 널리 사용되고 있는 방법은 알루미늄 열간단조법으로 물성이 가장 안정적이어서 구조용부품에 적용되고 있다. There are various methods of manufacturing the aluminum lower arm, but the most widely used method is aluminum hot forging, which is applied to structural parts because the physical properties are most stable.
여기서, 종래의 열간단조공법을 이용하여 알루미늄 로워암의 제조 방법을 첨부한 도 2를 참조로 설명하면 다음과 같다.Here, it will be described with reference to Figure 2 attached to the aluminum lower arm manufacturing method using a conventional hot forging method as follows.
종래의 열간단조공법을 이용한 알루미늄 로워암의 제조 순서를 간략히 나열하면 1)연주봉절단 → 2)가열 → 3)롤링 → 4)벤딩 → 5)스웨이징 → 6)황타 → 7)1차 정타 → 8)트리밍 → 9)2차 가열 → 10)2차정타 → 11)2차트리밍 → 12)가공 의 순서로 진행된다.The process of manufacturing aluminum lower arm using the conventional hot forging method can be briefly listed as follows: 1) cutting rod → 2) heating → 3) rolling → 4) bending → 5) swaging → 6) yellow → 7) primary 8) Trimming → 9) Secondary heating → 10) Secondary hitting → 11) Secondary trimming → 12) Processing.
대개, 열간단조품으로 사용하는 단조봉은 연속 주조된 봉을 사용한다. Usually, forged rods used for hot forging use continuous cast rods.
일반적인 작은 부품의 경우에는 연주봉을 적당한 크기만큼 잘라서 단조를 하면 되지만, 자동차 구조용 보안 부품인 로워암은 그 크기가 가로 60cm, 세로 35cm, 높이 6cm 정도로 큰 부품이다. In the case of general small parts, the rods can be cut and forged by a suitable size, but the lower arm, which is a security part for automobile structures, is a part that is about 60cm wide, 35cm high and 6cm high.
따라서, 로워암과 같이 큰 부품은 연주봉을 로워암의 형상에 가깝게 되도록 롤링과 벤딩, 그리고 스웨이징을 통해서만 단조가 가능하다. Therefore, large parts such as the lower arm can be forged only by rolling, bending, and swaging to bring the rod closer to the shape of the lower arm.
이에, 알루미늄 열간단조공법은 그 공정 변수의 다양함과, 공정 단계의 과다로 그 제조공정이 복잡해지고 제조비용이 상승하는 단점이 있고, 또한 열간단조품 은 적정 단련비 이상이 되어야 물성이 높고 안정되게 나오므로, 3번의 단조작업과 1회의 트리밍을 통해서 제품이 성형되는 바, 이는 회수율을 저하시키는 원인이 되고, 결국 전체적인 제조비용이 상승하게 되는 문제점으로 작용한다.Therefore, the aluminum hot forging method has a disadvantage in that the manufacturing process is complicated and the manufacturing cost is increased due to the variety of process variables and excessive process steps, and the hot forging product has a high physical property and is stable when the hot forging product is equal to or higher than an appropriate tempering ratio. Therefore, the product is molded through three forging operations and one trimming, which causes the recovery rate to be lowered, resulting in an increase in the overall manufacturing cost.
이에, 알루미늄 로워암 제조시 안정적인 물성과 함께 높은 생산성을 가지고, 특히 회수율이 높아 원가절감이 가능하며, 품질적으로 안정된 로워암을 제조할 수 있는 방안이 요구되고 있다.Accordingly, there is a demand for a method for producing a lower arm having stable productivity and high productivity, in particular, a high recovery rate and cost reduction, and a quality stable aluminum arm.
본 발명은 상기와 같은 점을 감안하여 개발된 것으로서, 기존의 열간단조품에 사용하는 알루미늄 A6061소재가 아니라 주조용 소재인 A356 소재를 반응고성형하여 프리폼으로 먼저 제작한 다음, 이를 1회 단조 및 트리밍 공정을 거치게 하여 가공 조립할 수 있는 로워암 완제품으로 완성될 수 있도록 함으로써, 열간단조공법의 공정수를 줄이고, 회수율을 높여 제조원가를 낮추며, 기존 열간단조품에 상응하는 높은 물성치를 가질 수 있도록 한 자동차용 알루미늄 로워암 제조 방법을 제공하는데 그 목적이 있다.
The present invention was developed in view of the above-mentioned, the reaction of the A356 material of the casting material, instead of the aluminum A6061 material used in the existing hot forging product produced by the preform first, and then forged once and trimming Automotive aluminum that can be processed and assembled into lower arm finished products that can be processed and assembled, reducing the number of processes in the hot forging process, increasing the recovery rate, lowering the manufacturing cost, and having high physical properties equivalent to existing hot forging products. It is an object of the present invention to provide a lower arm manufacturing method.
상기한 목적을 달성하기 위한 본 발명은 자동차용 알루미늄 로워암 제조 방법에 있어서, 반응고 성형장비를 이용하여 A356합금 용탕의 주입후, 냉각하여 슬러리를 제조한 다음, 제조된 슬러리를 프리폼 금형에 사출장비를 이용하여 사출하 여 이루어지는 반응고 성형을 이용한 실형상 알루미늄 로워암 프리폼 제작 단계와;In order to achieve the above object, the present invention provides a method for manufacturing aluminum lower arm for automobiles, by injecting molten A356 alloy using a reaction apparatus, and cooling to prepare a slurry, and then injecting the prepared slurry into a preform mold. A step of producing a real aluminum lower arm preform using reaction solid-forming, which is performed by injection using a device;
제조된 프리폼을 단조를 위해 연속가열로에서 460∼480℃ 의 온도로 가열하는 단계와;Heating the prepared preform at a temperature of 460-480 ° C. in a continuous heating furnace for forging;
가열된 프리폼을 에어햄머 단조기를 이용하여 단 1회 단조하는 단계와;Forging the heated preform only once using an air hammer forging machine;
단조 완료된 프리폼을 1번의 트리밍으로 최종 로워암 형상을 얻어 가공 조립할 수 있도록 한 단계를 포함하여 이루어지는 것을 특징으로 하는 자동차용 알루미늄 로워암 제조 방법을 제공한다.It provides a method for manufacturing an aluminum lower arm for automobiles, characterized in that it comprises one step to obtain a final lower arm shape by a single trimming the forged preform.
이하, 본 발명을 바람직한 실시예로서 보다 상세하게 설명하기로 한다.Hereinafter, the present invention will be described in more detail as a preferred embodiment.
첨부한 도 1은 본 발명에 따른 자동차용 알루미늄 로워암 제조 방법을 설명하기 위한 공정도이다.1 is a flowchart illustrating a method for manufacturing aluminum lower arms for automobiles according to the present invention.
본 발명은 반응고 성형하여 로워암을 프리폼으로 먼저 제작한 다음, 이를 1회 단조 및 트리밍 공정을 거치게 한 후, 마지막으로 가공 조립하는 단계로 이루어지는 알루미늄 로워암의 제조 방법을 제공하고자 한 것이다.The present invention is to provide a method for producing an aluminum lower arm consisting of the first step to produce the lower arm by the preform by the reaction, then subjected to a forging and trimming process, and finally the work assembling.
본 발명의 방법을 각 단계별로 상세하게 설명하면 다음과 같다.The method of the present invention will be described in detail for each step as follows.
(1) 반응고 성형을 이용한 실형상 알루미늄 로워암의 프리폼 제조(1) Preparation of Preform of Real Aluminum Lower Arm Using Reaction Solid Forming
반응고성형은 반응고 성형장비를 이용하여 A356합금 용탕의 주입후, 3단계 냉각속도로 냉각하여 슬러리를 제조하였으며 제조된 슬러리를 프로폼 금형에 사출장비를 이용하여 사출하여 로워암 프리폼으로 제작하게 된다.The reaction solid molding is prepared by injecting the A356 alloy molten metal using the reaction solid molding machine, and cooling it at a three-stage cooling rate to produce a slurry. The prepared slurry is injected into a proform mold using an injection equipment to produce a lower arm preform. .
프리폼 제작시의 싸이클 타임은 50초 정도로 균일하게 조절하고, 제작된 프리폼은 X선 비파괴검사를 실시하여 내부 결함 존재 유무를 검토하게 된다.The cycle time at the time of manufacturing the preform is uniformly adjusted to about 50 seconds, and the prepared preform is subjected to X-ray nondestructive inspection to examine the presence of internal defects.
여기서, 본 발명의 방법은 일반 알루미늄 주조단조와 큰 차이점을 나타낸다.Here, the method of the present invention shows a big difference from ordinary aluminum casting forging.
즉, 종래 주조단조시에는 알루미늄 프리폼 제작에 일반적인 중력주조를 이용하거나 경사경동주조방식을 이용하여 프리폼을 제작하였지만, 이럴 경우 제품 내부에는 불가항력으로 생기는 주조 결함이 존재하는데, 프리폼 내부에 주조 결함이 존재할 경우 단조후 열처리시 내부 결함들이 온도상승에 의해 표면에 작은 브리스터(blister)를 나타내게 된다.That is, in the conventional casting forging, preforms are manufactured by using general gravity casting or inclined tilt casting in the production of aluminum preforms, but in this case, casting defects generated by force majeure exist inside the product, and casting defects exist inside the preforms. In the case of heat treatment after forging, internal defects show small blisters on the surface due to temperature rise.
이는, 제품 물성을 떨어뜨리게 되어, 제품 전체의 균일한 품질을 보장할 수 없게 된다. This results in deterioration of product properties, and it is not possible to guarantee uniform quality of the entire product.
그러나, 본 발명에 따른 반응고성형을 이용한 프리폼 제작시, 상기한 내부 결함을 완전히 없앨수 있으므로 단조후 열처리후에도 좋은 표면조건과 함께 균일한 물성의 보장이 가능하다. However, when fabricating the preform using the reaction solidification according to the present invention, since the internal defects can be completely eliminated, it is possible to guarantee uniform physical properties with good surface conditions even after heat treatment after forging.
또한, 일반 중력주조나 경사경동주조방식으로 프리폼을 만들경우 싸이클 타임이 90초 내지 120초 이상이 되어 생산성이 나쁘나, 반응고성형을 이용할 경우 싸이클 타임이 50초 정도로 단축되어 생산성을 크게 높일수 있다.In addition, the cycle time is 90 seconds to 120 seconds or more when the preform is made by general gravity casting or inclined tilt casting, so productivity is bad. However, when the reaction solid molding is used, the cycle time is shortened to about 50 seconds, thereby greatly increasing the productivity.
2. 제조된 프리폼의 가열 단계2. Heating step of the prepared preform
제조된 프리폼은 단조를 위해 연속가열로를 이용하여 460∼480℃사이에서 가열하게 된다.The prepared preform is heated between 460 ~ 480 ℃ using a continuous heating furnace for forging.
프리폼을 가열하는 이유는 단조시 성형성을 높이기위해 가열하는 것이며, 온도를 한정하는 것은 제품형상과 크기에 따라 가열온도와 가열시간을 경험적으로 변경하는 것으로, 온도는 460∼480℃사이에서 진행되며 실제제품의 형상 및 크기에 따라 성형성이 제일 좋은 온도를 찾게 된다.The reason for heating the preform is to increase the formability during forging, and to limit the temperature is to empirically change the heating temperature and the heating time according to the product shape and size, and the temperature is between 460 ~ 480 ℃. Depending on the shape and size of the actual product, the best formability is found.
3. 1회 단조작업3. One time forging
가열된 프리폼을 에어햄머 단조기를 이용하여 단 1회 단조하였다.The heated preform was forged only once using an air hammer forging machine.
일반적으로 열간단조법은 연주봉을 가열하여 1차 황타 및 정타작업을 한 후, 트리밍을 하고 다시 가열하여 2차 정타작업후 형상이 완성되고 트리밍을 한다. In general, the hot forging method heats the rod and performs the first blow and the hitting, and then trims and heats again to complete the shape after the second hitting and trimming.
따라서, 공정이 복잡하고 공정마다 공정변수를 관리해야 하며 비용이 높아지게 된다. 또 싸이클 타임이 굉장히 길어지고 수율이 나빠지는(50-60%)는 단점도 있다. Therefore, the process is complicated, process variables must be managed for each process, and the cost is high. There is also a drawback to the extremely long cycle times and poor yields (50-60%).
그러나 본 발명에서는 결함없는 실형상의 프리폼을 이용하여 단 1회 단조하므로 공정을 완전히 단축하고, 싸이클 타임을 줄이며 회수율을 70%이상으로 높여 비용을 낮출수 있다.However, in the present invention, since the forging is performed only once using a defect-free preform, the process can be completely shortened, the cycle time can be reduced, and the recovery rate can be increased to 70% or more to lower the cost.
4. 트리밍공정4. Trimming process
단 1번의 트리밍으로 원하는 로워암의 형상을 얻게 되고, 이 최종 제품으로서의 로워암을 가공 조립하게 된다.With only one trimming, the desired lower arm shape is obtained, and the lower arm as the final product is processed and assembled.
이와 같은 공정으로 제작된 알루미늄 로워암과, 종래의 일반 열간단조품에 대한 기계적 물성치를 측정하였는 바, 그 결과는 다음의 표 1에 나타낸 바와 같다.The mechanical properties of the aluminum lower arm and the conventional hot forging manufactured according to the above process were measured, and the results are shown in Table 1 below.
위의 표 1에서 보듯이, 일반 알루미늄 열간단조와 반응고성형을 이용한 알루미늄 주조단조 로워암의 물성이 거의 동일한 것으로 측정되었다. As shown in Table 1 above, the physical properties of the aluminum casting forging lower arm using general aluminum hot forging and reaction solidification were measured to be almost the same.
특히, 회수율에 있어서 종래의 열간단조품의 경우 55%정도이나, 본 발명에 따른 반응고성형을 이용한 알루미늄 주조단조 로워암의 경우에는 약 70%에 달해 공정 가격을 크게 낮출 수 있다.In particular, the recovery rate is about 55% in the case of a conventional hot forging, but in the case of an aluminum casting forging lower arm using the reaction solidification according to the present invention, the process cost can be significantly lowered to about 70%.
이상에서 본 바와 같이, 본 발명에 따른 자동차용 알루미늄 로워암 제조 방법에 의하면, 기존의 열간단조 방식보다 그 공정 단계가 대폭 축소되어 생산성 및 작업성을 향상시킬 수 있다.As seen above, according to the aluminum lower arm manufacturing method for automobiles according to the present invention, the process step is significantly reduced than the conventional hot forging method can be improved productivity and workability.
특히, 공정수의 절감으로 인하여, 회수율을 향상시킬 수 있다.In particular, due to the reduction of the process water, the recovery rate can be improved.
또한, 기존의 열간단조물에 비하여 제조 비용을 크게 절감하면서도 거의 동등하거나 보다 우수한 물성을 갖는 장점이 있다.In addition, there is an advantage having a substantially equivalent or better physical properties while significantly reducing the manufacturing cost compared to the existing hot forging.
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| KR1020040070696A KR20060021965A (en) | 2004-09-06 | 2004-09-06 | Method for manufacturing aluminium lower arm of vehicle |
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| CN102319867A (en) * | 2011-09-29 | 2012-01-18 | 芜湖禾田汽车工业有限公司 | Forging forming process for control arm |
| CN102699265A (en) * | 2011-04-15 | 2012-10-03 | 大连大高阀门股份有限公司 | Mold and process for producing joint of counteractive rod |
| CN102825208A (en) * | 2012-08-31 | 2012-12-19 | 芜湖禾田汽车工业有限公司 | Forging and forming process of aluminum alloy car control arm |
| CN103470662A (en) * | 2013-09-27 | 2013-12-25 | 泉州鲤城福辉汽车配件有限公司 | Production process of adjusting arm housing |
| WO2014065626A1 (en) * | 2012-10-25 | 2014-05-01 | 인지에이엠티주식회사 | Method for manufacturing aluminum bearing insert for lower crank case of engine |
| KR101431808B1 (en) * | 2014-05-16 | 2014-08-19 | 주식회사 청운 | Method for manufacturing a lower arm using Hammer forging and a lower arm thereby |
| KR101500012B1 (en) * | 2009-12-01 | 2015-03-09 | 현대자동차주식회사 | Reinforce low crankcase and method for manufacturing the same, low crankcase |
| KR101511544B1 (en) * | 2013-11-15 | 2015-04-13 | 현대자동차주식회사 | A method for manufacturing forged product using hot forging aluminum alloy |
| KR20190133820A (en) | 2018-05-24 | 2019-12-04 | (주) 동양에이.케이코리아 | Method for manufacturing aluminum-silicon alloy extruded material and aluminum-silicon alloy extruded material manufactured using the same |
| KR20200092150A (en) | 2019-01-24 | 2020-08-03 | 주식회사 새해성 | A method of forming a lower arm for preventing stress cracking in forming a lower arm for an automobile and a lower arm manufactured by the method |
| KR20210073781A (en) | 2019-12-11 | 2021-06-21 | (주) 동양에이.케이코리아 | Method for manufacturing high strength aluminum alloy forged plate |
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| KR101500012B1 (en) * | 2009-12-01 | 2015-03-09 | 현대자동차주식회사 | Reinforce low crankcase and method for manufacturing the same, low crankcase |
| CN102699265A (en) * | 2011-04-15 | 2012-10-03 | 大连大高阀门股份有限公司 | Mold and process for producing joint of counteractive rod |
| CN102319867A (en) * | 2011-09-29 | 2012-01-18 | 芜湖禾田汽车工业有限公司 | Forging forming process for control arm |
| CN102825208A (en) * | 2012-08-31 | 2012-12-19 | 芜湖禾田汽车工业有限公司 | Forging and forming process of aluminum alloy car control arm |
| WO2014065626A1 (en) * | 2012-10-25 | 2014-05-01 | 인지에이엠티주식회사 | Method for manufacturing aluminum bearing insert for lower crank case of engine |
| CN103470662A (en) * | 2013-09-27 | 2013-12-25 | 泉州鲤城福辉汽车配件有限公司 | Production process of adjusting arm housing |
| KR101511544B1 (en) * | 2013-11-15 | 2015-04-13 | 현대자동차주식회사 | A method for manufacturing forged product using hot forging aluminum alloy |
| KR101431808B1 (en) * | 2014-05-16 | 2014-08-19 | 주식회사 청운 | Method for manufacturing a lower arm using Hammer forging and a lower arm thereby |
| KR20190133820A (en) | 2018-05-24 | 2019-12-04 | (주) 동양에이.케이코리아 | Method for manufacturing aluminum-silicon alloy extruded material and aluminum-silicon alloy extruded material manufactured using the same |
| KR20200092150A (en) | 2019-01-24 | 2020-08-03 | 주식회사 새해성 | A method of forming a lower arm for preventing stress cracking in forming a lower arm for an automobile and a lower arm manufactured by the method |
| KR20210073781A (en) | 2019-12-11 | 2021-06-21 | (주) 동양에이.케이코리아 | Method for manufacturing high strength aluminum alloy forged plate |
| CN113894243A (en) * | 2021-12-10 | 2022-01-07 | 宁波旭升汽车技术股份有限公司 | Short-process forging process for automobile chassis forge piece |
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