KR20010010099A - method for producing connecting rod made from aluminium alloy - Google Patents

method for producing connecting rod made from aluminium alloy Download PDF

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Publication number
KR20010010099A
KR20010010099A KR1019990028798A KR19990028798A KR20010010099A KR 20010010099 A KR20010010099 A KR 20010010099A KR 1019990028798 A KR1019990028798 A KR 1019990028798A KR 19990028798 A KR19990028798 A KR 19990028798A KR 20010010099 A KR20010010099 A KR 20010010099A
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South Korea
Prior art keywords
connecting rod
aluminum
molten aluminum
molten metal
punch
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KR1019990028798A
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Korean (ko)
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KR100320238B1 (en
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김성철
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정몽규
현대자동차 주식회사
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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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/2015—Means for forcing the molten metal into the die
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/08—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled
    • B22D17/12—Cold chamber machines, i.e. with unheated press chamber into which molten metal is ladled with vertical press motion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

PURPOSE: A method for producing a connecting rod made of an aluminum composite is provided to rapidly produce the aluminum composite with a reinforcement and excellent surface illumination by infiltrating molten aluminum in a connecting rod shaped freeform after pressurizing the molten aluminum second times. CONSTITUTION: The connecting rod shaped ceramic freeform(3) is placed in a cavity(21) of a lower die(20) and molten aluminum is injected into the lower die. On combining the lower die and an upper die(10) each other, a punch(11) of the upper die descends to first pressurize molten aluminum and the pressurized molten aluminum is secondly pressurized by a side hydraulic cylinder. Due to both pressurizing processes, the molten aluminum is infiltrated into the freeform. Then, the hydraulic cylinder, the punch and the upper die are sequentially separated to remove a ceramic rod from the lower die.

Description

알루미늄 복합재료 커넥팅 로드 제조방법{method for producing connecting rod made from aluminium alloy}Method for producing connecting rod made from aluminum alloy

본 발명은 2차 가압식 용탕 주조장치를 이용한 알루미늄 복합재료 커넥팅 로드 제조방법에 관한 것으로서, 더욱 상세하게는 커넥팅 로드형 세라믹 프리폼이 안착된 금형의 캐비티에 알루미늄 용탕을 주입하고 금형 상측에 설치된 펀치를 통해 알루미늄 용탕을 1차 가압하여 용침시키고, 캐비티와 연통되게 금형의 측면에 설치된 유압 실린더를 통해 알루미늄 용탕을 2차 가압함으로써 고 보강재가 함유되고 표면 조도가 좋은 알루미늄 복합재의 커넥팅 로드를 단시간에 제조할 수 있도록 하는 알루미늄 복합재의 커넥팅 로드 제조방법에 관한 것이다.The present invention relates to a method for manufacturing an aluminum composite connecting rod using a secondary pressure molten metal casting apparatus, and more particularly, to inject aluminum molten metal into a cavity of a mold on which a connecting rod-type ceramic preform is seated, and through a punch installed on the upper side of the mold. It is possible to manufacture connecting rods of aluminum composites with high reinforcement and good surface roughness by pressurizing aluminum molten by primary pressure and infiltrating it by secondary pressurizing aluminum molten metal through hydraulic cylinder installed on the side of mold to communicate with cavity. It relates to a method of manufacturing a connecting rod of aluminum composite material.

자동차 엔진부품에서 동력전달의 중요한 역할을 담당하고 있는 커넥팅 로드(connecting rod)는 엔진 작동중 폭발에 의한 압축하중과 크랭크 운동에 따르는 복잡한 인장하중, 굽힘하중을 받게 된다.Connecting rods, which play an important role in power transmission in automotive engine parts, are subject to complex tensile and bending loads due to explosion and crank movement due to explosion during engine operation.

이에 따라, 일반적으로 널리 쓰이는 커넥팅 로드의 제조는 강도가 높은 탄소강 소재를 열간단조(hot forging) 성형하여 제조하고 있거나, 원가절감을 위해 소결단조 성형하여 제조하고 있다.Accordingly, generally used connecting rods are manufactured by hot forging high strength carbon steel materials or by sinter forging for cost reduction.

이러한 커넥팅 로드는 경량화로 제조할 경우 연비 및 NVH 측면에서 큰 효과를 가지나, 기존 철계재질을 이용하는 열간단조 및 소결단조 커넥팅 로드의 제작법은 경량화에 한계가 있다.The connecting rod has a great effect in terms of fuel efficiency and NVH when manufactured at light weight, but the manufacturing method of hot forging and sintered forging connecting rods using existing iron-based materials has a limitation in weight reduction.

최근에는 커넥팅 로드의 재질을 알루미늄 합금으로 바꾸고, 여러가지 제조 공법으로 강도 및 강성을 보강하는 연구가 진행되고 있는 바, 균질(homogeneous)한 재질을 적용하는 공법으로는 미국 랜사이드(LANXIDE)사의 무가압 용침(pressureless infiltration)공법이 있다. 이 무가압 용침공법으로 세라믹 보강재 함량이 매우 놓은 복합재료도 제작이 가능하며, 이러한 공법에 의한 제작공정은 아래와 같다.Recently, research has been conducted to change the material of the connecting rod to aluminum alloy and to reinforce strength and rigidity by various manufacturing methods. As a method of applying a homogeneous material, no pressure is applied to LANXIDE of USA. There is a pressureless infiltration technique. This pressure-free infiltration method can be used to produce composite materials with very high ceramic reinforcement content. The manufacturing process by this method is as follows.

먼저, 커넥팅 로드 형태로 세라믹 프리폼을 Al2O3입자로 50~55 vol% 정도가 되도록 하여 제작하고, 그 제작된 세라믹 프리폼을 약 10시간 정도로 약 800℃ N2가스 분위기에서 soaking 한 다음, 그 세라믹 프리폼에 용탕 알루미늄을 부어 넣은 후 약 3시간 동안 무가압 용침시킨다. 그리고, 제품을 건져내어 용탕 알루미늄이 응고된 잔탕을 제거한 다음, 마무리 가공하게 되면 제작이 완료된다.First, the ceramic preform is made into 50 ~ 55 vol% of Al 2 O 3 particles in the form of a connecting rod, and the produced ceramic preform is soaked at about 800 ° C. in a N 2 gas atmosphere for about 10 hours. The molten aluminum is poured into the ceramic preform and then pressurized for about 3 hours. Then, after the product is removed, the molten aluminum in which the molten aluminum is solidified is removed, and when finished, the production is completed.

그런데, 알루미늄 복합재료로 커넥팅 로드를 만들려면 보강재 함량이 50~55% 정도로 매우 높아야 하는데, 일반적인 북합재료 제조방법인 스퀴즈 주조(squeeze casting)는 용침깊이가 고보강재인 경우 30mm 미만이기 때문에, 상술한 바와 같이 제품 제조시간이 15시간정도로 매우 길고 제품의 표면 조도가 좋지 못한 무가압 용침공법으로 제조해야 하는 문제점이 있다.However, in order to make the connecting rod from the aluminum composite material, the content of the reinforcement should be very high, such as 50 to 55%. Since the squeeze casting, which is a general manufacturing method of the composite material, is less than 30 mm when the squeeze depth is the high reinforcing material, As described above, there is a problem in that the manufacturing time of the product is very long, such as about 15 hours, and the production of the product is performed by a pressureless invasion method in which the surface roughness of the product is poor.

따라서, 본 발명은 상기와 같은 문제점을 감안하여 안출된 것으로서, 커넥팅 로드형 프리폼에 알루미늄 용탕을 1차, 2차 가압하여 용침시킴으로써 보강재가 함유되고 표면 조도가 좋은 알루미늄 복합재의 커넥팅 로드를 단시간에 제조할 수 있도록 하는 알루미늄 복합재의 커넥팅 로드 제조방법을 제공하는 데 그 목적이 있다.Accordingly, the present invention has been made in view of the above problems, by producing a connecting rod of the aluminum composite material containing a reinforcement and good surface roughness in a short time by infiltrating the molten aluminum first and second pressure in the connecting rod type preform. It is an object of the present invention to provide a method for manufacturing connecting rods of aluminum composite material.

도 1은 본 발명의 실시예에 따른 알루미늄 복합재료 커넥팅 로드를 제조하기 위한 주조장치를 보인 것으로서, 도 1a는 2차 가압식 알루미늄 용탕 주조장치를 보인 평면 개략 단면도, 도 1b는 도 1에 도시된 2차 가압식 알루미늄 용탕 주조장치의 측단면도.Figure 1 shows a casting apparatus for manufacturing an aluminum composite connecting rod according to an embodiment of the present invention, Figure 1a is a schematic top cross-sectional view showing a second pressurized aluminum melt casting apparatus, Figure 1b is shown in Figure 1 Side sectional view of a primary pressurized aluminum molten metal casting machine.

도 2는 알루미늄 복합재료 커넥팅 로드를 제작하는 과정에 사용되는 커넥팅 로드형 세라믹 프리폼을 보인 사시도.Figure 2 is a perspective view showing a connecting rod-type ceramic preform used in the process of manufacturing the aluminum composite connecting rod.

* 도면의 주요 부분에 대한 부호의 설명 *Explanation of symbols on the main parts of the drawings

1 : 주조 장치 3 : 세라믹 프리폼1: casting device 3: ceramic preform

5 : 알루미늄 용탕 10 : 상부 금형5: molten aluminum 10: upper mold

11 : 펀치 20 : 하부 금형11: punch 20: lower mold

21 : 캐비티 23 : 밀핀21: Cavity 23: Milpin

25 : 유압 실린더25: hydraulic cylinder

상기와 같은 목적을 달성하기 위한 본 발명은 커넥팅 로드형 세라믹 프리폼을 제작하는 프리폼 제작공정과, 그 세라믹 프리폼을 하부 금형의 캐비티에 위치시키고 알루미늄 용탕을 주입하는 용탕 주입공정과, 그 용탕이 주입된 하부 금형에 상부 금형을 형합시킨 다음 상부 금형의 펀치를 하강시켜 알루미늄 용탕을 가압하면서 용침시키는 제1차 가압공정과, 제1차 가압되어 측으로 밀려나온 용탕을 측면의 유압 실린더를 통해 가압하는 제2차 가압공정과, 유압 실린더와 펀치 및 상부 금형을 순차로 분리한 후 하부 금형의 밀핀으로 응고된 커넥팅 로드를 탈거하는 탈거공정을 포함하는 알루미늄 복합재료 커넥팅 로드 제조방법을 제공하는 특징이 있다.The present invention for achieving the above object is a preform manufacturing process for manufacturing a connecting rod-type ceramic preform, a melt injection process for placing the ceramic preform in the cavity of the lower mold and injecting aluminum molten metal, and the molten metal is injected A first pressurizing process of injecting the upper mold into the lower mold and then lowering the punch of the upper mold to pressurize the aluminum molten metal, and a second pressurizing of the molten metal pushed out to the side through the hydraulic cylinder on the side; It is characterized by providing a method for manufacturing an aluminum composite connecting rod including a differential pressurization process and a stripping process of separating the hydraulic cylinder, the punch, and the upper mold in sequence, and then removing the connecting rod solidified by the milling pin of the lower mold.

또한, 세라믹 프리폼은 Al2O3입자가 50~55 vol%로 함유되어 800℃로 30분 동안 예열되고, 알루미늄 용탕은 Al에 2~7%의 Mg을 함유시키는 특징이 있다.In addition, the ceramic preform contains Al 2 O 3 particles in a range of 50 to 55 vol% and is preheated at 800 ° C. for 30 minutes.

이하, 본 발명의 실시예를 첨부도면에 의거 더욱 상세히 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described in more detail based on the accompanying drawings.

도 1a 및 도 1b는 본 발명의 실시예에 따른 알루미늄 복합재료 커넥팅 로드를 제조하기 위한 스퀴즈 주조장치(1)를 보인 것으로, 상부 금형(10)과, 커넥팅 로드가 주조 성형되기 위한 캐비티(21)가 형성되는 하부 금형(20)으로 구성된다.1A and 1B show a squeeze casting apparatus 1 for manufacturing an aluminum composite connecting rod according to an embodiment of the present invention, wherein the upper mold 10 and the cavity 21 for casting molding the connecting rod are shown. It consists of a lower mold 20 is formed.

상부 금형(10)의 중심부에는 하부 금형(20)의 캐비티(21)에 주입된 용탕(5)을 가압하기 위한 펀치(11)가 상하 이동가능하게 설치되고, 하부 금형(20)의 하부면에는 응고 성형된 커넥팅 로드를 탈거시키기 위한 밀핀(23)이 다수개 설치된다.The punch 11 for pressing the molten metal 5 injected into the cavity 21 of the lower mold 20 is installed in the center of the upper mold 10 so as to be movable up and down, and on the lower surface of the lower mold 20. Multiple pins 23 are provided for removing the solidified molded connecting rod.

그리고, 하부 금형(20)의 양측단에는 펀치(11)의 가압력에 의해 측면으로 넘치는 알루미늄 용탕(5)을 다시 가압하기 위한 유압 실린더(25)가 설치된다. 즉, 커넥팅 로드의 대단부와 소단부가 성형되는 위치의 캐비티(21) 4개소와 연통되는 실린더(26)내에 유압에 의해 동작하는 피스톤(27)이 설치되어 유압 실린더(25)를 구성하게 된다.And hydraulic cylinder 25 for pressurizing the aluminum molten metal 5 which overflows to the side by the pressing force of the punch 11 again is provided in the both side ends of the lower metal mold | die 20. As shown in FIG. That is, a piston 27 operated by hydraulic pressure is installed in the cylinder 26 communicating with four cavities 21 at positions where the large and small ends of the connecting rod are formed to form the hydraulic cylinder 25. .

이와 같이 구성되는 스퀴즈 주조장치(1)를 이용하여 알루미늄 복합재료 커넥팅 로드를 제조하는 과정을 살펴보면 다음과 같다.Looking at the process of manufacturing the aluminum composite connecting rod using the squeeze casting device (1) configured as described above are as follows.

우선, 도 2에 도시되는 바와 같이 Al2O3입자가 50~55 vol%로 함유되는 커넥팅 로드형 세라믹 프리폼(3)을 제작하여 800℃로 30분 동안 예열시킨다. 이렇게 하여 제작된 세라믹 프리폼(3)을 도 1a에 도시되는 바와 같이 형개된 하부 금형(20)의 캐비티(21)의 적당하게 위치시킨 다음, Al에 2~7%의 Mg을 함유하는 알루미늄 용탕(5)을 하부 금형(20)의 캐비티(21)에 주입시킨다.First, as shown in FIG. 2, a connecting rod-type ceramic preform 3 containing 50 to 55 vol% of Al 2 O 3 particles is prepared and preheated at 800 ° C. for 30 minutes. The ceramic preform 3 thus produced is properly positioned in the cavity 21 of the lower mold 20 opened as shown in FIG. 1A, and then aluminum molten metal containing 2-7% Mg in Al ( 5) is injected into the cavity 21 of the lower mold 20.

그리고, 용탕(5)이 주입된 하부 금형(20)에 상부 금형(10)을 형합시킨 다음, 상부 금형(10)의 펀치(11)를 하강시켜 알루미늄 용탕(5)을 일정 시간동안 1차 가압하게 된다. 이때, 펀치(11)에 의해 가압된 알루미늄 용탕(5)은 용침되면서 일부는 하부 금형(20)의 실린더(26)로 넘쳐 흐르게 된다.Then, the upper mold 10 is molded to the lower mold 20 into which the molten metal 5 is injected, and then the punch 11 of the upper mold 10 is lowered to pressurize the aluminum molten metal 5 for a predetermined time. Done. At this time, the molten aluminum 5 pressurized by the punch 11 is infiltrated and partly flows to the cylinder 26 of the lower mold 20.

그 후, 도 1b에 도시되는 바와 같이, 실린더(26)내의 피스톤(27)을 유압을 통해 가압하여 1차 가압으로 밀려나온 알루미늄 용탕(5)을 2차 가압하게 된다. 이때, 2차 가압되는 알루미늄 용탕(5)은 고밀도로 용침된다.Thereafter, as shown in FIG. 1B, the piston 27 in the cylinder 26 is pressurized by hydraulic pressure to pressurize the aluminum molten metal 5 pushed out by primary pressure. At this time, the molten aluminum 5 which is secondary pressurized is infiltrated with high density.

이와 같이 2차 가압상태에서 일정시간이 경과하게 되면, 냉각작용에 의해 하부 금형(20)의 캐비티(21)에는 응고된 커넥팅 로드가 성형되는 바, 이러한 응고가 완료되면 유압 실린더(25)와 펀치(11)의 가압력을 해제한 다음, 상부 금형(10)을 하부 금형(20)으로부터 형개하고, 하부 금형(20)의 밀핀(23)을 상부로 밀어 캐비티(21)내의 응고된 커넥팅 로드를 탈거하게 된다.When a predetermined time elapses in the secondary pressurization state as described above, a solidified connecting rod is formed in the cavity 21 of the lower mold 20 by the cooling action. When the solidification is completed, the hydraulic cylinder 25 and the punch are completed. After the pressing force of (11) is released, the upper mold 10 is opened from the lower mold 20, and the push pin 23 of the lower mold 20 is pushed upward to remove the solidified connecting rod in the cavity 21. Done.

또한, 하부 금형(20)으로부터 탈거된 커넥팅 로드는 실린더(26)가 위치되는 부위에 잔탕이 형성되어 있는 바, 이 잔탕을 제거하게 되면 커넥팅 로드의 제조가 완료된다.In addition, as for the connecting rod removed from the lower mold 20, a residual water is formed at a portion where the cylinder 26 is located, and the removal of the residual water completes the manufacturing of the connecting rod.

이상에서 살펴본 바와 같이, 본 발명은 커넥팅 로드형 프리폼에 알루미늄 용탕을 1차, 2차 가압 용침시키는 스퀴즈 주조 성형함으로써 고보강재가 함유되는 알루미늄 복합재의 커넥팅 로드를 기존 무가압 용탕 공법에 비해 짧은시간에 제조할 수 있게 됨은 물론 표면 조도가 좋은 커넥팅 로드를 성형할 수 있게 되는 것이다.As described above, the present invention is a squeeze casting molding for the first and second pressure infiltration of the molten aluminum in the connecting rod-type preform in a short time compared to the conventional pressure-free melt method of connecting the rod of aluminum composite containing high reinforcement Not only can it be manufactured, but it can also form a connecting rod with good surface roughness.

본 발명은 특정의 실시예와 관련하여 도시 및 설명하였지만, 첨부 특허청구범위에 의해 나타난 발명의 사상 및 영역으로부터 벗어나지 않는 한도 내에서 다양한 개조 및 변화가 가능하다는 것을 당업계에서 통상의 지식을 가진 자라면 누구나 쉽게 알 수 있을 것이다.While the invention has been shown and described with respect to particular embodiments, those skilled in the art will recognize that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the appended claims. Anyone can easily know.

Claims (3)

커넥팅 로드형 세라믹 프리폼(3)을 제작하는 프리폼(3) 제작공정과, 상기 세라믹 프리폼(3)을 하부 금형(20)의 캐비티(21)에 위치시키고 알루미늄 용탕(5)을 주입하는 용탕 주입공정과, 상기 용탕(5)이 주입된 하부 금형(20)에 상부 금형(10)을 형합시킨 다음 상기 상부 금형(10)의 펀치(11)를 하강시켜 알루미늄 용탕(5)을 가압하면서 용침시키는 제1차 가압공정과, 상기 제1차 가압되어 측으로 밀려나온 용탕(5)을 측면의 유압 실린더(25)를 통해 가압하는 제2차 가압공정과, 상기 유압 실린더(25)와 상기 펀치(11) 및 상부 금형(10)을 순차로 분리한 후 상기 하부 금형(20)의 밀핀(23)으로 응고된 커넥팅 로드를 탈거하는 탈거공정을 포함하는 것을 특징으로 하는 알루미늄 복합재료 커넥팅 로드 제조방법.Preform (3) manufacturing process for manufacturing the connecting rod-type ceramic preform (3), and molten metal injection process for placing the ceramic preform (3) in the cavity 21 of the lower mold 20 and injecting the aluminum molten metal (5) And forming the upper mold 10 into the lower mold 20 into which the molten metal 5 is injected, and then lowering the punch 11 of the upper mold 10 to infiltrate the molten aluminum 5 while pressing the molten aluminum. A first pressurizing step, a second pressurizing step of pressurizing the molten metal 5 pushed out to the side through the first pressurization through the hydraulic cylinder 25 on the side, the hydraulic cylinder 25 and the punch 11 And a stripping process of separating the upper mold (10) sequentially and then removing the connecting rod solidified by the mill pin (23) of the lower mold (20). 제1 항에 있어서, 상기 세라믹 프리폼(3)은 Al2O3입자가 50~55 vol%로 함유되어 800℃로 30분 동안 예열되는 것을 특징으로 하는 알루미늄 복합재료 커넥팅 로드 제조방법.The method according to claim 1, wherein the ceramic preform (3) is preheated at 800 ° C. for 30 minutes with 50 to 55 vol% of Al 2 O 3 particles. 제1 항에 있어서, 상기 알루미늄 용탕(5)은 Al에 2~7%의 Mg을 함유시키는 것을 특징으로 하는 알루미늄 복합재료 커넥팅 로드 제조방법.The method of claim 1, wherein the molten aluminum (5) contains 2-7% Mg in Al.
KR1019990028798A 1999-07-16 1999-07-16 method for producing connecting rod made from aluminium alloy KR100320238B1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101016994B1 (en) * 2008-08-07 2011-02-28 주식회사 지알켐 Connecting rod mold of recipro-compressor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101016994B1 (en) * 2008-08-07 2011-02-28 주식회사 지알켐 Connecting rod mold of recipro-compressor

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