KR20200017253A - Manufacture method of sub-frame for vehicle - Google Patents

Manufacture method of sub-frame for vehicle Download PDF

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KR20200017253A
KR20200017253A KR1020180092627A KR20180092627A KR20200017253A KR 20200017253 A KR20200017253 A KR 20200017253A KR 1020180092627 A KR1020180092627 A KR 1020180092627A KR 20180092627 A KR20180092627 A KR 20180092627A KR 20200017253 A KR20200017253 A KR 20200017253A
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South Korea
Prior art keywords
tube
hydroforming
subframe
manufacturing
vehicle
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KR1020180092627A
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Korean (ko)
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김기주
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동명대학교산학협력단
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/035—Deforming tubular bodies including an additional treatment performed by fluid pressure, e.g. perforating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
    • B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
    • B21D26/033—Deforming tubular bodies
    • B21D26/041—Means for controlling fluid parameters, e.g. pressure or temperature

Abstract

The present invention relates to a manufacturing method of an automotive subframe using hydroforming, which forms a side member of the subframe by hydroforming. According to the present invention, a side member (10) is seated in a front seating groove formed in a front cross member (20) of the subframe and a rear seating groove formed in a rear cross member (30).

Description

하이드로포밍을 이용한 차량 서브프레임의 제조방법{Manufacture method of sub-frame for vehicle}Manufacturing method of sub-frame for vehicle using hydroforming

본 발명은 하이드로포밍을 이용한 차량 서브프레임의 제조방법에 관한 것이다.The present invention relates to a method of manufacturing a vehicle subframe using hydroforming.

자동차 생산대수 및 보유대수의 증가로 인하여 지구환경 오염의 주범으로 지목되는 자동차 배기가스 (CO, HC, Nox)의 배출량은 점차 증대되고 있는 실정이며, 특히 석유 산유국들의 고유가 정책으로 인하여 차량의 경량화를 통한 연비 향상을 위한 연구는 자동차업체 및 부품 업체들에게 필연적인 문제로 대두되고 있다.Due to the increase in the number of automobile production and the number of vehicles, emissions of automobile exhaust gases (CO, HC, Nox), which are considered as the main causes of global environmental pollution, are gradually increasing, especially due to high oil prices of oil-producing countries. Research to improve fuel efficiency through the research is emerging as an inevitable problem for automakers and component makers.

이와 같이 자동차의 강화된 배기가스 관련 법규를 만족하고 연비를 향상할 수 있는 다양한 방법이 개발 적용되고 있으나 자동차 연비 향상 효과를 가장 크게 볼 수 있는 방법은 자동차 경량화이다. 경량화를 위한 방법은 기존의 철강 재료에서 알루미늄이나 플라스틱 등과 같은 비철 소재를 이용하여 부품을 개발하는 방법, 강도가 필요한 부위나 보강재(reinforcement) 등의 높은 인장강도를 요구하는 부품을 고장력강으로 대체 사용하는 방법 또는 hydroforming, roll forming, Tailored blank 등의 제조공정을 통하여 강도가 취약 하거나 여러 파트로 겹침 용접된 부위의 형상을 개선하여 최적의 단일 형상으로 부품을 제조하는 공정기술 개발 등의 방법이 주로 이루어지고 있다.As described above, various methods for satisfying the enhanced exhaust gas regulations of automobiles and improving fuel efficiency have been developed and applied. The method for weight reduction is to develop parts using non-ferrous materials such as aluminum or plastic from existing steel materials, and to replace parts requiring high tensile strength, such as areas requiring strength or reinforcement, with high tensile steel. Through the manufacturing process such as hydroforming, roll forming, or tailed blank, the process technology development of manufacturing parts with optimum single shape by improving the shape of welded parts with weak strength or overlapping with several parts is mainly made. have.

이러한 차량 서브프레임의 제조방법으로서, 한국공개특허 제2007-0036891호의 사각형 서브프레임의 차체 전방측을 이루는 한 변을 포함하여 이루어진 전방측멤버와; 상기 서브프레임의 양측을 이루도록 상기 전방측멤버의 양측에 연결되어 차체의 후방측으로 길게 연장되는 좌측멤버 및 우측멤버와; 상기 서브프레임의 차체 후방측을 이루는 한 변을 포함하여 이루어지고, 양측에서 상기 좌측멤버 및 우측멤버와 연결되는 후방측멤버;를 각각 제작하여, 상기 전방측멤버와 상기 좌측멤버 및 우측멤버의 연결부위 및 상기 후방측멤버와 상기 좌측멤버 및 우측멤버의 연결부위를 용접에 의해 연결하는 것을 특징으로 하는 차량의 서브프레임 제작방법이 공개된 적이 있었다.A method for manufacturing such a vehicle subframe, comprising: a front side member including one side that forms a front side of a vehicle body of a rectangular subframe of Korean Patent Laid-Open Publication No. 2007-0036891; A left member and a right member connected to both sides of the front member so as to form both sides of the subframe, and extending to the rear side of the vehicle body; And a rear side member formed on one side of the subframe, the rear side member being connected to the left and right members on both sides of the subframe, respectively, by connecting the front side member to the left and right members. A method of manufacturing a subframe of a vehicle has been disclosed, wherein a portion and a connecting portion of the rear member and the left member and the right member are connected by welding.

그러나 종래기술은 각종 멤버의 제작이 완료된 후, 각종 멤버 간에 용접공정이 추가적으로 필요함에 따라, 공정 시간 및 비용이 증가하는 문제점이 있었다.However, in the prior art, as the welding process is additionally required between the various members after the production of the various members is completed, the process time and the cost increase.

한국공개특허 제2007-0036891호(2007.04.04)Korean Patent Publication No. 2007-0036891 (2007.04.04)

본 발명은 상기한 문제점을 해결하기 위하여 안출된 것으로, 본 발명의 목적은 차량 서브프레임을 하이드로포밍에 의해 제조함으로써, 공정 시간 및 공정 비용을 단축할 수 있는 하이드로포밍을 이용한 차량 서브프레임의 제조방법을 제공하려는 것이다.The present invention has been made to solve the above problems, an object of the present invention is to manufacture a vehicle subframe by hydroforming, a method of manufacturing a vehicle subframe using hydroforming that can reduce the process time and process cost Is to provide.

또한, 본 발명의 다른 목적은 차량 서브프레임을 경량화할 수 있는 하이드로포밍을 이용한 차량 서브프레임의 제조방법을 제공하려는 것이다.Another object of the present invention is to provide a method for manufacturing a vehicle subframe using hydroforming, which can reduce the vehicle subframe.

본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 서브프레임의 사이드멤버(10)를 튜브의 하이드로포밍에 의해 성형한다.In the method of manufacturing a vehicle subframe using hydroforming according to the present invention, the side member 10 of the subframe is molded by hydroforming the tube.

또한, 상기 사이드멤버(10)가 알루미늄재질로 이루어진다.In addition, the side member 10 is made of aluminum.

또한, 상기 사이드멤버(10)가 서브프레임의 프론트크로스멤버(20)에 형성된 프론트안착홈과 리어크로스멤버(30)에 형성된 리어안착홈에 안착된다.In addition, the side member 10 is seated in the front seating groove formed in the front cross member 20 of the subframe and the rear seating groove formed in the rear cross member 30.

또한, 상기 튜브의 하이드로포밍에 있어서, 상기 튜브의 최대내부압력이 하기 수학식 1을 만족하고, 상기 튜브의 소성변형압력이 하기 수학식 2를 만족한다.In addition, in hydroforming of the tube, the maximum internal pressure of the tube satisfies Equation 1 below, and the plastic deformation pressure of the tube satisfies Equation 2 below.

(수학식 1)(Equation 1)

Figure pat00001
Figure pat00001

단,

Figure pat00002
는 튜브의 최대내부압력,
Figure pat00003
는 튜브 소재의 인장강도,
Figure pat00004
는 튜브의 최소 곡률 반경, t는 튜브벽두께.only,
Figure pat00002
Is the maximum internal pressure of the tube,
Figure pat00003
Is the tensile strength of the tube material,
Figure pat00004
Is the minimum radius of curvature of the tube, t is the tube wall thickness.

(수학식 2)(Equation 2)

Figure pat00005
Figure pat00005

단,

Figure pat00006
는 튜브의 소성변형압력,
Figure pat00007
는 튜브 직경, t는 튜브벽두께,
Figure pat00008
는 튜브 소재의 인장강도.only,
Figure pat00006
Is the plastic deformation pressure of the tube,
Figure pat00007
Is the tube diameter, t is the tube wall thickness,
Figure pat00008
Is the tensile strength of the tube material.

이에 따라, 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 차량 서브프레임을 하이드로포밍에 의해 제조함으로써, 공정 시간 및 공정 비용을 단축할 수 있는 장점이 있다.Accordingly, the method of manufacturing a vehicle subframe using hydroforming according to the present invention has an advantage of shortening the process time and the process cost by manufacturing the vehicle subframe by hydroforming.

또한, 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 차량 서브프레임을 경량화할 수 있는 장점이 있다.In addition, the manufacturing method of the vehicle subframe using the hydroforming according to the present invention has the advantage that the vehicle subframe can be reduced in weight.

도 1은 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법에 의해 제조된 차량 서브프레임을 나타낸 사시도.1 is a perspective view showing a vehicle subframe manufactured by a method for manufacturing a vehicle subframe using hydroforming according to the present invention.

이하, 본 발명의 기술적 사상을 첨부된 도면을 사용하여 더욱 구체적으로 설명한다.Hereinafter, the technical spirit of the present invention will be described in more detail with reference to the accompanying drawings.

첨부된 도면은 본 발명의 기술적 사상을 더욱 구체적으로 설명하기 위하여 도시한 일예에 불과하므로 본 발명의 기술적 사상이 첨부된 도면의 형태에 한정되는 것은 아니다.The accompanying drawings are only examples as illustrated in order to describe the technical idea of the present invention in more detail, and thus the technical idea of the present invention is not limited to the accompanying drawings.

도 1은 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법에 의해 제조된 차량 서브프레임을 나타낸 사시도이다.1 is a perspective view showing a vehicle subframe manufactured by a method for manufacturing a vehicle subframe using hydroforming according to the present invention.

도 1을 참조하면, 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 서브프레임의 사이드멤버(10)를 튜브의 하이드로포밍에 의해 성형한다. 이 때, 상기 튜브의 하이드로포밍은 상기 튜브의 내부에 물을 채우고 상기 튜브의 외면에 압력을 가한 후, 상기 튜브를 벤딩하여 서브프레임의 사이드멤버(10)에 대응하는 형상으로 성형한다.Referring to FIG. 1, in the method of manufacturing a vehicle subframe using hydroforming according to the present invention, the side member 10 of the subframe is formed by hydroforming a tube. At this time, the hydroforming of the tube is filled with water inside the tube and pressure is applied to the outer surface of the tube, the tube is bent into a shape corresponding to the side member 10 of the subframe.

이에 따라, 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 차량 서브프레임을 하이드로포밍에 의해 제조함으로써, 공정 시간 및 공정 비용을 단축할 수 있는 장점이 있다.Accordingly, the method of manufacturing a vehicle subframe using hydroforming according to the present invention has an advantage of shortening the process time and the process cost by manufacturing the vehicle subframe by hydroforming.

또한, 본 발명에 따른 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 차량 서브프레임을 경량화할 수 있는 장점이 있다.In addition, the manufacturing method of the vehicle subframe using the hydroforming according to the present invention has the advantage that the vehicle subframe can be reduced in weight.

또한, 상기 사이드멤버(10)는 알루미늄재질로 이루어질 수 있다. 이에 따라, 상기 사이드멤버(10)의 경량화 및 부식이 감지될 수 있다.In addition, the side member 10 may be made of aluminum. Accordingly, weight reduction and corrosion of the side member 10 can be detected.

또한, 상기 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 상기 사이드멤버(10)가 서브프레임의 프론트크로스멤버(20)에 형성된 프론트안착홈과 리어크로스멤버(30)에 형성된 리어안착홈에 안착될 수 있다.In addition, in the method of manufacturing a vehicle subframe using the hydroforming, the side member 10 is to be seated in the front seating groove formed in the front cross member 20 of the subframe and the rear seating groove formed in the rear cross member 30. Can be.

이때, 상기 프론트크로스멤버(20)의 프론트안착홈은 상기 프론트크로스멤버(20)의 벤딩을 통해 형성될 수 있고, 상기 리어크로스멤버(30)의 리어안착홈은 상기 리어크로스멤버(30)의 벤딩을 통해 형성될 수 있다.In this case, the front seating groove of the front cross member 20 may be formed through the bending of the front cross member 20, and the rear seating groove of the rear cross member 30 is formed of the rear cross member 30. It can be formed through bending.

또한, 상기 하이드로포밍을 이용한 차량 서브프레임의 제조방법은 상기 프론트크로스멤버(20)의 프론트안착홈을 형성할 부위에 상기 사이드멤버(10)를 안착한 상태에서 상기 프론트크로스멤버(20)를 벤딩하여 상기 프론트안착홈을 형성할 수 있으며, 상기 리어크로스멤버(30)의 리어안착홈을 형성할 부위에 상기 사이드멤버(10)를 안착한 상태에서 상기 리어크로스멤버(30)를 벤딩하여 상기 리어안착홈을 형성할 수 있다.In addition, the method for manufacturing a vehicle subframe using the hydroforming is to bend the front cross member 20 in a state in which the side member 10 is seated in a portion to form a front seating groove of the front cross member 20. The front seating groove may be formed, and the rear seating groove may be bent by bending the rear cross member 30 in a state in which the side member 10 is seated at a portion where the rear seating groove of the rear cross member 30 is to be formed. Can be formed.

한편, 상기 튜브의 하이드로포밍에 있어서, 상기 튜브의 최대내부압력이 하기 수학식 1을 만족하고, 상기 튜브의 소성변형압력이 하기 수학식 2를 만족할 수 있다.In the hydroforming of the tube, the maximum internal pressure of the tube may satisfy Equation 1, and the plastic deformation pressure of the tube may satisfy Equation 2.

(수학식 1)(Equation 1)

Figure pat00009
Figure pat00009

단,

Figure pat00010
는 튜브의 최대내부압력,
Figure pat00011
는 튜브 소재의 인장강도,
Figure pat00012
는 튜브의 최소 곡률 반경, t는 튜브벽두께.only,
Figure pat00010
Is the maximum internal pressure of the tube,
Figure pat00011
Is the tensile strength of the tube material,
Figure pat00012
Is the minimum radius of curvature of the tube, t is the tube wall thickness.

(수학식 2)(Equation 2)

Figure pat00013
Figure pat00013

단,

Figure pat00014
는 튜브의 소성변형압력,
Figure pat00015
는 튜브 직경, t는 튜브벽두께,
Figure pat00016
는 튜브 소재의 인장강도.only,
Figure pat00014
Is the plastic deformation pressure of the tube,
Figure pat00015
Is the tube diameter, t is the tube wall thickness,
Figure pat00016
Is the tensile strength of the tube material.

본 출원인은 상기 수학식 1, 2를 경험적 및 실험적으로 산출하였다.Applicant has calculated the above Equations 1 and 2 empirically and experimentally.

본 발명은 상기한 실시예에 한정되지 아니하며, 적용범위가 다양함은 물론이고, 청구범위에서 청구하는 본 발명의 요지를 벗어남이 없이 다양한 변형 실시가 가능한 것은 물론이다.The present invention is not limited to the above-described embodiments, and the scope of application is not limited, and various modifications can be made without departing from the gist of the present invention as claimed in the claims.

10 : 사이드멤버
20 : 프론트크로스멤버
30 : 리어크로스멤버10: side member
20: Front Cross Member
30: rear cross member

Claims (4)

서브프레임의 사이드멤버(10)를 튜브의 하이드로포밍에 의해 성형하는 하이드로포밍을 이용한 차량 서브프레임의 제조방법.
A method for manufacturing a vehicle subframe using hydroforming in which the side members 10 of the subframe are formed by hydroforming the tubes.
제1항에 있어서,
상기 사이드멤버(10)가 알루미늄재질로 이루어지는 하이드로포밍을 이용한 차량 서브프레임의 제조방법.
The method of claim 1,
The side member 10 is a method of manufacturing a vehicle subframe using a hydroforming made of aluminum.
제1항에 있어서,
상기 사이드멤버(10)가 서브프레임의 프론트크로스멤버(20)에 형성된 프론트안착홈과 리어크로스멤버(30)에 형성된 리어안착홈에 안착되는 하이드로포밍을 이용한 차량 서브프레임의 제조방법.
The method of claim 1,
The side member 10 is a method of manufacturing a vehicle subframe using a hydroforming seated in the front seating groove formed in the front cross member 20 of the subframe and the rear seating groove formed in the rear cross member (30).
제1항에 있어서,
상기 튜브의 하이드로포밍에 있어서, 상기 튜브의 최대내부압력이 하기 수학식 1을 만족하고, 상기 튜브의 소성변형압력이 하기 수학식 2를 만족하는 하이드로포밍을 이용한 차량 서브프레임의 제조방법.
(수학식 1)

Figure pat00017

단,
Figure pat00018
는 튜브의 최대내부압력,
Figure pat00019
는 튜브 소재의 인장강도,
Figure pat00020
는 튜브의 최소 곡률 반경, t는 튜브벽두께.
(수학식 2)
Figure pat00021

단,
Figure pat00022
는 튜브의 소성변형압력,
Figure pat00023
는 튜브 직경, t는 튜브벽두께,
Figure pat00024
는 튜브 소재의 인장강도.The method of claim 1,
In the hydroforming of the tube, a method of manufacturing a vehicle subframe using hydroforming in which the maximum internal pressure of the tube satisfies Equation 1 below and the plastic deformation pressure of the tube satisfies Equation 2 below.
(Equation 1)

Figure pat00017

only,
Figure pat00018
Is the maximum internal pressure of the tube,
Figure pat00019
Is the tensile strength of the tube material,
Figure pat00020
Is the minimum radius of curvature of the tube, t is the tube wall thickness.
(Equation 2)
Figure pat00021

only,
Figure pat00022
Is the plastic deformation pressure of the tube,
Figure pat00023
Is the tube diameter, t is the tube wall thickness,
Figure pat00024
Is the tensile strength of the tube material.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070036891A (en) 2005-09-30 2007-04-04 현대자동차주식회사 Sub frame manufacturing method of a vehicle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20070036891A (en) 2005-09-30 2007-04-04 현대자동차주식회사 Sub frame manufacturing method of a vehicle

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