KR20090039359A - Single plate material forming typed lower arm - Google Patents

Single plate material forming typed lower arm Download PDF

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Publication number
KR20090039359A
KR20090039359A KR1020070104958A KR20070104958A KR20090039359A KR 20090039359 A KR20090039359 A KR 20090039359A KR 1020070104958 A KR1020070104958 A KR 1020070104958A KR 20070104958 A KR20070104958 A KR 20070104958A KR 20090039359 A KR20090039359 A KR 20090039359A
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South Korea
Prior art keywords
lower arm
single plate
bump stop
mpa
arm body
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KR1020070104958A
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Korean (ko)
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이희청
김대업
이기양
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현대모비스 주식회사
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Priority to KR1020070104958A priority Critical patent/KR20090039359A/en
Publication of KR20090039359A publication Critical patent/KR20090039359A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G7/00—Pivoted suspension arms; Accessories thereof
    • B60G7/001—Suspension arms, e.g. constructional features
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/41—Elastic mounts, e.g. bushings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2204/00—Indexing codes related to suspensions per se or to auxiliary parts
    • B60G2204/40—Auxiliary suspension parts; Adjustment of suspensions
    • B60G2204/43—Fittings, brackets or knuckles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/70—Materials used in suspensions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2206/00—Indexing codes related to the manufacturing of suspensions: constructional features, the materials used, procedures or tools
    • B60G2206/01—Constructional features of suspension elements, e.g. arms, dampers, springs
    • B60G2206/80—Manufacturing procedures
    • B60G2206/81—Shaping

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

A single board molding type lower arm is provided to increase anti-rust lifetime by strengthening corrosion resistance due to plating treatment through making a lower arm of one plate-shape member. A single board molding type lower arm comprises a lower arm body(1). The lower arm body comprises: three mounting terminals(6,7,8) which are formed in order to be bush-connected towards a knuckle and car body; multiple shape terminals(2,3,4) which is protruded or concaved in each site; and a bump stop cup assembling terminal(5) in which a bump stop cup mounted with a chassis spring is coupled. The surface of a metal material part is zinc-plated with melting alloy.

Description

단일 판재 성형 타입 로어 암{Single plate material forming typed lower arm} Single plate material forming typed lower arm

본 발명은 로어 암에 관한 것으로, 특히 고 내식과 고 장력 강을 이용한 단일 판재 성형 타입 로어 암에 관한 것이다.The present invention relates to a lower arm, and more particularly, to a single sheet forming type lower arm using high corrosion resistance and high tensile steel.

일반적으로 Generally

주행 중 차량이 노면의 불균일로부터 소음을 수반하는 진동을 받게 되면서 차체가 흔들리는 현상을 방지하는 현가 장치는 스프링과 쇽업소버(Shock Absober) 및 스테빌라이져 등으로 구성되어, 대체로 스프링상수와 댐핑력 및 차고조종의 3가지 기능을 주로 하면서 차량의 승차감과 안정성을 개선하는 역할을 한다.Suspension system, which prevents the body shaking due to vibration accompanied by noise from road unevenness while driving, consists of spring, shock absorber, stabilizer, etc., and the spring constant, damping force and garage steering It mainly serves to improve the ride comfort and stability of the vehicle.

이와 같은 현가 장치를 구성하는 구성 요소 중 주요 부품중 하나인 로어 암(또는, 컨트롤 암)은 차량 조립 시, 한 부위는 볼 조인트를 매개로 조향 너클에 연결되고 다른 부위는 부시와 함께 축을 매개로 하여 프레임에 연결되며, 이와 같이 조립되는 로어 암은 자동차의 주행 시 바퀴로부터 여러 방향으로 동시에 힘이 전달되어져 내구성이 요구되는 부품이다.One of the main components of this suspension system, the lower arm (or control arm), is assembled to the steering knuckle via the ball joint and the other part via the shaft with the bush when assembling the vehicle. The lower arm is assembled to the frame, and thus the lower arm is assembled in such a way that the force is transmitted from the wheels in various directions at the same time.

이에 따라, 통상 상기 로어 암은 차륜의 너클을 통해 들어오는 차량의 전· 후방 하중뿐만 아니라 내·외향 하중을 지지하도록 강성을 갖는 강(Steel)재질로 이루어지게 된다.Accordingly, the lower arm is generally made of steel having rigidity to support not only the front and rear loads of the vehicle coming through the knuckles of the wheel, but also the inward and outward loads.

일례로, 인장강도 370~440MPa 수준의 소재를 어퍼 판재와 로어 판재로 만들어 서로 용접해 제작하여, 주행 중 차륜 쪽을 통하여 들어오는 외력을 지지하여 차체 이상 거동을 방지하는 역할을 수행하도록 견고하게 지탱하는 강성을 유지해주게 된다.For example, by making the material of the tensile strength 370 ~ 440MPa of the upper plate and the lower plate made of welded to each other, and to support the external force coming through the wheel side while driving to firmly support the role to prevent abnormal body behavior It will maintain the stiffness.

그러나, 이와 같이 2개의 판상 부재로 이루어진 강재를 이용하여 로어 암을 제조하게 되면, 서로 용접되는 각각 판상 부재가 강성을 위해 일정 두께를 유지해주어야 만 하므로 중량 증가를 가져와 연비 저하의 한 요인으로 작용함은 물론, 2개의 판상 부재를 서로 용접함에 따라 용접과 용접공정 품질관리에 시간이 소요되므로 원가를 상승시키는 요인으로도 작용하게 된다.However, when the lower arm is manufactured by using the steel consisting of two plate members, the plate members welded to each other must maintain a certain thickness for rigidity, thus increasing weight and acting as a factor of lowering fuel efficiency. Of course, as the two plate members are welded to each other, it takes time for welding and quality control of the welding process.

또한, 로어 암의 특성상 외부노출로 인하여 내식 성능에 취약한 점이 있게 된다.In addition, due to the characteristics of the lower arm, there is a weak point in corrosion resistance due to external exposure.

이에 본 발명은 상기와 같은 점을 감안하여 발명된 것으로, 표면을 도금한 고내식 고장력 강재를 1개의 판상 부재로 로어 암을 제작함에 따라, 중량 증가를 가져오지 않고 강성을 향상함과 더불어, 도금 처리에 따른 내식 성능 강화로 인해 방청수명을 증대함에 그 목적이 있다.Accordingly, the present invention has been made in view of the above, and by manufacturing a lower arm of a high corrosion resistant high strength steel plated on a surface with one plate member, the rigidity is improved without increasing weight, and plating The purpose is to increase the rust prevention life due to the enhanced corrosion resistance according to the treatment.

또한, 본 발명은 표면을 도금한 고내식 고장력 강재를 1개의 판상 부재로 로어 암을 용접 없이 제작하므로, 용접에 따른 제반 문제를 해소함에 그 목적이 있다.In addition, the present invention is to produce a high corrosion-resistant high-strength steel plated on the surface with a single plate-like member without welding, the object is to solve all problems caused by welding.

상기와 같은 목적을 달성하기 위한 본 발명은, 너클과 차체 쪽으로 각각 부시 체결되기 위한 3곳의 마운팅 체결단이 형성됨과 더불어, 각 부위로 함몰되거나 돌출시킨 다수 형상 단과 섀시 스프링이 안착되는 범프 스탑컵이 결합되는 범프 스탑컵 조립단이 형성되도록 성형되어진 로어 암 바디가,In order to achieve the above object, the present invention provides a bump stop cup having three mounting fastening ends for bushing to the knuckle and the vehicle body, and a plurality of shaped ends and chassis springs recessed or protruding into the respective parts. The lower arm body is formed to form a bump stop cup assembly stage to be coupled,

590MPa ~ 780MPa 인장강도를 갖는 FB(Ferrite Bainite)계열인 1개의 강판인 금속 재질 부로 이루어짐과 더불어, 상기 금속 재질 부의 표면으로는 용융 합금화 아연 도금 처리되어진 것을 특징으로 한다. It is made of a metal material, which is one steel plate of FB (Ferrite Bainite) series having a tensile strength of 590 MPa to 780 MPa, and the surface of the metal material is hot-dip galvanized.

그리고, 상기 용융 합금화 아연 도금 층은 부착량이 약 45.8g/㎡ ~ 47.1g/㎡ 이고, 합금화도는 10.9Fe% ~ 10.6Fe%이며, 파우더링성은 3등급이고, 델타(Delta)상 비율은 약 88.4% ~ 92.8%를 갖는 것을 특징으로 한다.In addition, the molten alloy galvanized layer has an adhesion amount of about 45.8g / ㎡ ~ 47.1g / ㎡, the degree of alloying is 10.9Fe% ~ 10.6Fe%, powdering property is three grades, the delta phase ratio is about And 88.4% to 92.8%.

이러한 본 발명에 의하면, 표면을 도금한 고내식 고장력 강재를 1개의 판상 부재로 용접이 없이 로어 암을 제작함에 따라, 용접에 따른 제반 문제와 중량 증가를 가져오지 않고 강성을 향상함과 더불어, 외부노출 되더라도 도금 처리로 인해 방청수명을 증대할 수 있는 효과가 있게 된다.According to the present invention, as the lower arm is manufactured by welding a high corrosion-resistant high-strength steel plated with one plate member without welding, the rigidity is improved without any problems and weight increase caused by welding. Even if exposed, the plating treatment has the effect of increasing the rust-proof life.

또한, 본 발명은 표면을 도금한 고내식 고장력 강재를 1개의 판상 부재로 로어 암을 용접 없이 제작하므로, 컨트롤 암의 중량을 약 7.32Kg에서 6.69Kg로 줄여 줄 수 있는 효과가 있게 된다.In addition, the present invention is to produce a high corrosion-resistant high-strength steel plated surface to one plate member without welding the lower arm, thereby reducing the weight of the control arm from about 7.32 Kg to 6.69 Kg.

이하 본 발명의 실시예를 첨부된 예시도면을 참조로 상세히 설명하며, 이러한 실시예는 일례로서 본 발명이 속하는 기술 분야에서 통상의 지식을 가진 자가 여러 가지 상이한 형태로 구현될 수 있으므로, 여기에서 설명하는 실시예에 한정되지 않는다.DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the exemplary embodiments of the present invention may be embodied in various different forms, one of ordinary skill in the art to which the present invention pertains may be described herein. It is not limited to the Example to make.

도 1은 본 발명에 따른 단일 판재 성형 타입 로어 암의 구성도를 도시한 것인바, 본 발명의 로어 암은 1개의 판재를 이용해 전체적인 형상을 이루도록 성형되면서, 표면을 도금 처리한 로어 암 바디(1)로 이루어지고, 상기 로어 암 바디(1)에는 내구성을 강화하도록 각 부위로 함몰되거나 돌출시킨 형상 단(2,3,4)이 다수 형성됨과 더불어, 섀시 스프링이 안착되는 범프 스탑컵이 결합되도록 상기 로어 암 바디(1)에 개구시킨 범프 스탑컵 조립단(5)이 형성되어진다.1 is a block diagram of a single plate forming type lower arm according to the present invention, the lower arm of the present invention is molded to form an overall shape using a single plate, the lower arm body plated on the surface (1 ), The lower arm body 1 is formed with a plurality of shaped ends (2, 3, 4) recessed or protruded into each part to enhance durability, and the bump stop cup on which the chassis spring is seated is coupled. The bump stop cup assembly stage 5 opened in the lower arm body 1 is formed.

이와 더불어 상기 로어 암에는 너클과 차체 쪽으로 각각 부시 체결되기 위한 다수의 마운팅 체결단(6,7,8)이 형성되며, 상기 마운팅 체결단(6,7,8)은 로어 암 바디(1)에 끝단으로 3곳에 형성되어진다.In addition, the lower arm is provided with a plurality of mounting coupling ends 6, 7, 8 for bushing toward the knuckle and the vehicle body, respectively, and the mounting coupling ends 6, 7, 8 are attached to the lower arm body 1. It is formed in three places by the end.

이와 같은 로어 암 바디(1)는 강성을 갖는 고 장력 강판으로 이루어진 금속 재질 부(1a)로 이루어짐과 더불어, 상기 금속 재질 부(1a)의 표면으로는 도금 부(1b)를 형성하게 되며, 이러한 도금 부(1b)는 로어 암 바디(1)의 내식성을 강화시켜 주게 된다.The lower arm body 1 is made of a metal part 1a made of a high tensile steel sheet having rigidity, and forms a plating part 1b on the surface of the metal part 1a. The plating part 1b strengthens the corrosion resistance of the lower arm body 1.

이에 따른 상기 로어 암 바디(1)는 일례로, 자체적으로 강성이 큰 재질이면서 다양한 변태조직을 이용해 가공성도 우수한 고 장력 강판을 사용하게 되는데, 이러한 고 장력 강판은 통상적인 310MPa - 440MPa 인장강도를 갖는 강판에 비해, 약 590MPa - 780MPa 정도의 인장강도를 갖게 된다.Accordingly, the lower arm body 1 is an example of using a high tensile steel sheet having excellent rigidity and excellent workability by using various transformation structures, and the high tensile steel sheet has a typical tensile strength of 310 MPa-440 MPa. Compared to the steel sheet, it has a tensile strength of about 590 MPa-780 MPa.

예를 들어 590MPa 정도의 인장강도를 갖는 FB(Ferrite Bainite)계열의 FB590 재질을 게 이용해, 로어 암을 성형 제조하게 된다.For example, the lower arm is molded by using a FB590 material of the FB (Ferrite Bainite) series having a tensile strength of about 590 MPa.

이와 더불어 상기 로어 암 바디(1)는 자체적으로 내식성이 우수하도록 도금 처리되는데, 이는 일례로 용융 합금화 아연 도금 처리되어진다. In addition, the lower arm body 1 is plated to have excellent corrosion resistance on its own, which is, for example, hot-dip galvanized.

이러한 용융 합금화 아연 도금 층은 부착량이 약 45.8g/㎡ ~ 47.1g/㎡ 이고, 합금화도는 10.9Fe% ~ 10.6Fe%이며, 파우더링성은 3등급이고, 델타(Delta)상 비율은 약 88.4% ~ 92.8%를 갖으며, 이는 도금 층에 대한 성분 분석을 수행하는 EDS를 통한 분석결과이다.The hot dip galvanized layer has an adhesion amount of about 45.8 g / m 2 to 47.1 g / m 2, an alloying degree of 10.9 Fe% to 10.6 Fe%, powdering property of 3 grades, and a delta phase ratio of about 88.4%. 92.8%, which is the result of analysis through EDS performing component analysis on the plating layer.

이와 같이 현가 장치를 구성하는 본 발명의 로어 암이 다양한 변태조직을 이용해 가공성도 우수한 약 590MPa - 780MPa 정도의 인장강도를 갖는 고 장력 강판을 이용한 로어 암 바디(1)로 성형됨과 더불어, 내식성이 우수하도록 로어 암 바디(1)의 표면이 용융 합금화 아연 도금 처리됨에 따라, 자동차 섀시와 언더 바디(Under Body)부품 및 구조 재 등에 주로 사용되는 자동차용 열연강판에 비해 상대적으로 얇은 두께를 갖으면서도, 현가 요소로서 로어 암이 갖추어야 하는 고 장력과 고 내식성을 만족하면서 동시에, 자동차용 열연강판이 차지하는 약 25%의 자동차 자체 중량 범위를 보다 감소시켜 줄 수 있는 특징이 있게 된다.Thus, the lower arm of the present invention constituting the suspension device is molded into a lower arm body 1 using a high tensile steel sheet having a tensile strength of about 590 MPa-780 MPa excellent in workability by using various transformation structures, and also excellent in corrosion resistance. As the surface of the lower arm body 1 is hot-dip galvanized, it has a relatively thin thickness compared to automotive hot rolled steel sheets mainly used in automobile chassis, under body parts and structural materials. As a factor, it can satisfy the high tension and high corrosion resistance required by the lower arm, and at the same time, it can further reduce the vehicle's own weight range of about 25% of the hot rolled steel sheet for automobiles.

이와 더불어 로어 암을 이루는 로어 암 바디(1)가 590MPa 이상의 인장강도를 갖는 고 장력 강판이면서, 동시에 고 내식성을 갖도록 표면이 용융 합금화 아연 도금 처리되어진 1개의 단일 판재로 로어 암 바디(1)를 성형 제조함에 따라, 2개의 판재를 이용해 성형될 때 발생되는 용접 품질 문제가 없이 제조하면서 또한, 자체 중량도 저감 일례로, 약 7,32Kg에서 약 6.69Kg 정도로 줄여 줄 수 있게 된다.In addition, the lower arm body 1 constituting the lower arm is a high tensile steel sheet having a tensile strength of 590 MPa or more, and at the same time, the lower arm body 1 is formed from one single plate whose surface is hot-alloy galvanized to have high corrosion resistance. With the manufacturing, it is possible to reduce the self-weight, for example, from about 7,32Kg to about 6.69Kg, while producing without welding quality problems generated when molding using two plates.

이와 같이 고 장력이면서 표면을 도금 처리한 고 내식성 재질의 1개의 단일 판재를 이용하면 성형 공정도 간단해 지는데 즉, 1개의 판재를 이용해 형상 단(2,3,4)을 함몰시키거나 돌출시키면서 다수 형성함과 더불어, 섀시 스프링이 안착되는 범프 스탑컵이 끼워지는 범프 스탑컵 조립단(5)을 뚫으면서 로어 암 바디(1)를 성형하게 되면, 로어 암 바디(1)가 전체적인 로어 암 형상을 이루면서 제조되어진다.The use of a single plate made of high tension and highly corrosion-resistant material plated in this way also simplifies the molding process, that is, using one plate to indent or protrude the shape ends (2, 3, 4). In addition to forming the lower arm body 1 while the bump stop cup assembly end 5 into which the bump stop cup into which the chassis spring is seated is formed, the lower arm body 1 forms an overall lower arm shape. It is made while making.

이후, 상기 로어 암 바디(1)의 각 끝단 부위를 이루는 3곳으로 각각 너클과 차체 쪽으로 각각 부시 체결되기 위한 다수의 마운팅 체결단(6,7,8)을 형성하게 되면, 현가 장치를 이루는 로어 암이 1개의 판재를 이용한 로어 암 바디(1)만으로 완성되어지게 된다.Subsequently, when a plurality of mounting fastening ends 6, 7, and 8 are formed to be bushed to the knuckle and the vehicle body, respectively, at three places forming each end portion of the lower arm body 1, the lower part of the suspension device is formed. The arm is completed only with the lower arm body 1 using one plate.

도 1은 본 발명에 따른 단일 판재 성형 타입 로어 암의 구성도1 is a block diagram of a single plate forming type lower arm according to the present invention

<도면의 주요부분에 대한 부호의 설명>    <Description of the symbols for the main parts of the drawings>

1 : 로어 암 바디 1a : 금속 재질 부1: Lower arm body 1a: Metal part

1b : 도금 부 2,3,4 : 형상 단1b: plating part 2,3,4: shape end

5 : 범프 스탑컵 조립단 5: Bump Stop Cup Assembly

6,7,8 : 마운팅 체결단6,7,8: Mounting joint

Claims (2)

너클과 차체 쪽으로 각각 부시 체결되기 위한 3곳의 마운팅 체결단(6,7,8)이 형성됨과 더불어, 각 부위로 함몰되거나 돌출시킨 다수 형상 단(2,3,4)과 섀시 스프링이 안착되는 범프 스탑컵이 결합되는 범프 스탑컵 조립단(5)이 형성되도록 성형되어진 로어 암 바디(1)가,Three mounting joints 6, 7, 8 are formed for bushing toward the knuckle and the vehicle body, and multiple shape stages 2, 3, 4 and chassis springs recessed or protruding into each part are seated. The lower arm body 1 is formed to form a bump stop cup assembly end 5 to which the bump stop cups are coupled. 590MPa ~ 780MPa 인장강도를 갖는 FB(Ferrite Bainite)계열인 1개의 강판인 금속 재질 부(1a)로 이루어짐과 더불어, 상기 금속 재질 부(1a)의 표면으로는 용융 합금화 아연 도금 처리되어진 것을 특징으로 하는 단일 판재 성형 타입 로어 암. The metal part 1a, which is one steel plate of FB (Ferrite Bainite) series having a tensile strength of 590 MPa to 780 MPa, and a surface of the metal part 1a is hot-dip galvanized. Single plate forming type lower arm. 청구항 1에 있어서, 상기 용융 합금화 아연 도금 층은 부착량이 약 45.8g/㎡ ~ 47.1g/㎡ 이고, 합금화도는 10.9Fe% ~ 10.6Fe%이며, 파우더링성은 3등급이고, 델타(Delta)상 비율은 약 88.4% ~ 92.8%를 갖는 것을 특징으로 하는 단일 판재 성형 타입 로어 암. The method of claim 1, wherein the galvannealing layer has an adhesion amount of about 45.8g / ㎡ ~ 47.1g / ㎡, the degree of alloying is 10.9Fe% ~ 10.6Fe%, powdering property is 3 grade, Delta Single plate forming type lower arm, characterized in that the ratio has about 88.4% to 92.8%.
KR1020070104958A 2007-10-18 2007-10-18 Single plate material forming typed lower arm KR20090039359A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160104096A (en) * 2012-06-08 2016-09-02 신닛테츠스미킨 카부시키카이샤 Coupling structure, coupling member having coupling structure, and method for producing coupling member having coupling structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160104096A (en) * 2012-06-08 2016-09-02 신닛테츠스미킨 카부시키카이샤 Coupling structure, coupling member having coupling structure, and method for producing coupling member having coupling structure
KR101880836B1 (en) * 2012-06-08 2018-07-20 신닛테츠스미킨 카부시키카이샤 Coupling structure, coupling member having coupling structure, and method for producing coupling member having coupling structure
US10220662B2 (en) 2012-06-08 2019-03-05 Nippon Steel & Sumitomo Metal Corporation Coupling structure, coupling member having coupling structure, and method for manufacturing coupling member having coupling structure
US10377200B2 (en) 2012-06-08 2019-08-13 Nippon Steel Corporation Coupling structure, coupling member having coupling structure, and method for manufacturing coupling member having coupling structure

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