KR100373253B1 - Manufacturing method of lower arm for automobile - Google Patents

Manufacturing method of lower arm for automobile Download PDF

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Publication number
KR100373253B1
KR100373253B1 KR1019970033650A KR19970033650A KR100373253B1 KR 100373253 B1 KR100373253 B1 KR 100373253B1 KR 1019970033650 A KR1019970033650 A KR 1019970033650A KR 19970033650 A KR19970033650 A KR 19970033650A KR 100373253 B1 KR100373253 B1 KR 100373253B1
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South Korea
Prior art keywords
lower arm
spindle
manufacturing
tube
arm
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KR1019970033650A
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Korean (ko)
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KR19990010775A (en
Inventor
박석완
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기아자동차주식회사
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Priority to KR1019970033650A priority Critical patent/KR100373253B1/en
Publication of KR19990010775A publication Critical patent/KR19990010775A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J9/00—Forging presses
    • B21J9/02—Special design or construction
    • B21J9/06—Swaging presses; Upsetting presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P2700/00—Indexing scheme relating to the articles being treated, e.g. manufactured, repaired, assembled, connected or other operations covered in the subgroups
    • B23P2700/14—Suspension elements of automobile vehicles
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Vehicle Body Suspensions (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

PURPOSE: A manufacturing method of lower arm for automobile is provided to reduce man-power by fabricating the lower arm by tube hydroforming process and fabricating spindle by swaging process, thereby bonding the spindle to the lower arm by frictional welding. CONSTITUTION: The manufacturing method of lower arm for automobile comprises the step of frictional welding an expansion part of a spindle(3) the upper part diameter of which is contracted by swaging, and a certain length of the upper part of which is rolled to the lower part of a lower arm(7) fabricated by bending a cylindrical tube by tube hydroforming, expanding the middle part of the bent tube and finishing outline of the expanded middle part of the bent tube, wherein the spindle(3) and lower arm(7) are fabricated in different processes, the spindle(3) is frictional welded to the lower arm(7), remaining brackets are carbon dioxide welded in the same manner as the existing process, and ball joints are finally attached.

Description

자동차 로어아암의 제조방법Manufacturing method of automobile lower arm

본 발명은 자동차의 현가장치부에 장착되는 로어아암(lower arm)에 관한 것으로서, 로어아암의 제조방법을 개선하여 제작공수가 줄어들도록 하고 생산비용이 저감되도록 하는 것이다.The present invention relates to a lower arm (lower arm) to be mounted on the suspension unit of the vehicle, to improve the manufacturing method of the lower arm to reduce the manufacturing labor and to reduce the production cost.

일반적으로 자동차의 현가장치는 로어아암(lower arm)과 어퍼아암(uper arm)사이에 충격흡수기와 코일스프링이 장착되고, 상기 로어아암과 어퍼아암의 외측단부에 너클아암의 상단부와 하단부가 각기 볼조인트(ball joint)에 의해 연결되어, 너클아암(nuckle arm)에 바퀴가 체결되도록 되어 있다.Generally, a suspension device of a vehicle is provided with a shock absorber and a coil spring between a lower arm and an upper arm, and an upper end and a lower end of a knuckle arm at the outer end of the lower arm and the upper arm, respectively. Connected by a ball joint, the wheel is fastened to the nuckle arm.

여기에서, 로어아암은 일단부에 스핀들(spindle)이 형성되고 타단부에 볼조인트가 결합되며, 볼조인트는 일측의 하단부가 볼형상으로 형성되고 볼 상단부에 축(shaft)이 상부로 일정길이 연장 형성되어, 볼조인트의 볼부가 로어아암에 지지되고, 볼조인트의 축부가 너클아암에 회동 가능하게 지지되며, 로어아암은 볼조인트가 끼워지는 구멍 내주면부가 상하로 절곡 연장되어 있다.Here, the lower arm has a spindle formed at one end and a ball joint is coupled to the other end, and the ball joint has a lower end portion formed in a ball shape at one side and a shaft extending at a predetermined length in the upper end portion of the ball. The ball part of the ball joint is supported by the lower arm, the shaft part of the ball joint is supported by the knuckle arm so as to be rotatable, and the lower arm has an inner circumferential surface portion in which the ball joint is fitted is bent up and down.

이와같이 구성되는 로어아암은, 너클아암의 회전베어링 기능을 겸하는 것으로, 조립시 로어아암의 끝단부에 형성되는 구멍에 볼조인트의 하단 볼부가 압입되고, 볼부에 밀착된 로어아암의 볼 주변부가 코킹(calking)되어 결합되어 있다.The lower arm configured as described above serves as a rotary bearing function of the knuckle arm, and the lower ball part of the ball joint is press-fitted into the hole formed at the end of the lower arm during assembly, and the ball periphery of the lower arm in close contact with the ball part is caulked ( calking)

한편, 이러한, 로어아암은 프레스강판과 단조스핀들 및 브라켓을 이산화탄소(CO2) 용접하여 제작하고, 최후에 볼조인트를 결합하였으며, 도 1은 종래 단조스핀들의 제조공정을 나타내는 것으로서 원통형봉(1)을 단조하여 상단부 외경이 축소되도록 하므로 단턱부를 형성하고, 다음 공정에서 상단부 외주면을 절삭하며, 절삭된 상단 외주면부를 전조하여 완제품을 형성하였다.On the other hand, such a lower arm is manufactured by welding carbon steel (CO 2 ) to a press steel sheet and forged spindles and a bracket, and finally combined with a ball joint, Figure 1 shows a conventional manufacturing process of forged spines cylindrical rod (1) Forging to reduce the outer diameter of the upper end to form a stepped portion, in the next process to cut the upper outer peripheral surface, and rolled the cut upper outer peripheral surface to form a finished product.

그러나 이러한 종래 공법은 생산성이 좋으나 용접공수가 많고 품질검사가 까다로워지게 되는 단점이 있었다.However, this conventional method has a disadvantage in that the productivity is good, but the number of welding labor and the quality inspection becomes difficult.

본 발명은 상기와 같은 종래의 문제점을 해소하기 위해, 튜브액압성형법에 의해 로어아암을 제작하고 스웨이징 성형법에 의해 스핀들을 제작하여, 스핀들을 로어아암에 마찰용접에 의해 결합하도록 함으로써 작업공수가 줄어들도록 하는 것이다.The present invention, in order to solve the above-mentioned conventional problems, by manufacturing the lower arm by the tube hydraulic molding method and the spindle by the swaging molding method, by coupling the spindle to the lower arm by friction welding reduces the labor To do that.

도 1은 종래 로어아암의 스핀들 제조공정을 나타내는 공정도1 is a process chart showing a spindle manufacturing process of a conventional lower arm

도 2는 본 발명 로어아암의 스핀들 제조공정을 나타내는 공정도2 is a process chart showing a spindle manufacturing process of the lower arm of the present invention.

도 3은 본 발명 로어아암의 로어아암 제조공정을 나타내는 공정도Figure 3 is a process chart showing the lower arm manufacturing process of the lower arm of the present invention

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

3 : 스핀들 7 : 로어아암3: spindle 7: lower arm

먼저, 본 발명도 로어아암과 어퍼아암 사이에 충격흡수기와 코일스프링이 장착되고, 상기 로어아암과 어퍼아암의 외측단부에 너클아암의 상단부와 하단부가 각기 볼조인트에 의해 연결되어, 너클아암에 바퀴가 체결되도록 한다. 또한, 로어아암은 일단부에 스핀들이 형성되고 타단부에 볼조인트가 결합되며, 볼조인트는 일측의 하단부가 볼형상으로, 형성되고 볼 상단부에 축(shaft)이 상부로 일정길이 연장형성되어, 볼조인트의 볼부가 로어아암에 지지되고, 볼조인트의 축부가 너클아암에 회동 가능하게 지지되며, 로어아암은 볼조인트가 끼워지는 구멍 내주면부가 상하로 절곡 연장된다.First, the present invention is also equipped with a shock absorber and a coil spring between the lower arm and the upper arm, the upper end and the lower end of the knuckle arm are respectively connected to the outer end of the lower arm and the upper arm by a ball joint, the wheel to the knuckle arm To be fastened. In addition, the lower arm has a spindle is formed at one end and the ball joint is coupled to the other end, the ball joint is formed in a ball shape, the lower end of one side, the shaft (shaft) is formed in the upper end of the ball to extend a certain length, The ball portion of the ball joint is supported by the lower arm, the shaft portion of the ball joint is rotatably supported by the knuckle arm, and the lower arm extends up and down the inner peripheral surface of the hole into which the ball joint is fitted.

단, 본 발명은 도 2에 도시되는 바와 같이, 원통형 튜브를 스웨이징에 의해 상단부 직경이 축소되도록 하여 하단부에 단턱이 형성되도록 하고, 직경이 축소된 상단부 소정 길이를 전조가공하여 스핀들(3)을 제작하며, 도 3에 도시되는 바와 같이 원통형 튜브를 액압성형에 의해 벤딩하고 벤딩된 튜브의 중간부를 확관시키고 외곽선을 다듬질하여 로어아암(7)을 제작하며, 상기 로어아암(7)의 하단에 상기 스핀들(3)의 확장부를 마찰접합함을 그 제조방법상의 기본 특징으로 한다.However, in the present invention, as shown in FIG. 2, the upper end diameter is reduced by swaging the cylindrical tube so that the stepped portion is formed at the lower end, and the spindle 3 is rolled by rolling the predetermined length of the upper end portion whose diameter is reduced. 3, the cylindrical tube is bent by hydraulic molding, as shown in FIG. 3, the middle part of the bent tube is expanded, and the outline is trimmed to produce a lower arm 7, and the lower arm 7 is formed at the bottom of the lower arm 7. Friction bonding of the extension of the spindle 3 is a basic feature of the manufacturing method.

이와같이 구성되는 본 발명은, 스핀들(3)과 로어아암(7)을 각기 다른 공정에서 제작하고, 스핀들(3)을 로어아암(7)에 마찰접합시키며, 나머지 브라켓은 기존공정과 동일하게 이산화탄소 용접하고, 최후로 볼조인트를 취부한다.According to the present invention, the spindle 3 and the lower arm 7 are manufactured in different processes, the spindle 3 is friction-bonded to the lower arm 7, and the remaining brackets are carbon dioxide welded in the same manner as in the conventional process. Finally, attach the ball joint.

한편, 로어아암은 튜브액압성형(tube hydroforming) 기술에 의해 용접을 하지 않고 제작하며, 스핀들(3)은 스웨이징 성형기술을 이용하여 제작하므로 튜브액압성형에 의해 제작된 로어아암(7)에 스핀들(3)을 마찰접합하여 완성한다.On the other hand, the lower arm is manufactured without welding by tube hydroforming technology, and the spindle 3 is manufactured by using swaging molding technology, so the spindle is mounted on the lower arm 7 produced by tube hydraulic molding. Friction bonding (3) is completed.

이러한 본 발명은 용접작업을 제거하여 작업공수를 감소시키며, 스핀들의 제작시 종래의 절삭가공이 생략되어 생산비용이 저감되도록 하며, 일체화에 의해 용접플랜지부가 생략되고 튜브 확관으로 인한 가공경화 효과로 경량화가 가능하도록 한다.The present invention reduces the number of work by eliminating the welding work, the conventional cutting process is omitted during the manufacture of the spindle to reduce the production cost, the weld flange part is omitted by the integration and light weight due to the work hardening effect due to tube expansion To make it possible.

상기와 같이 구성되고 작동되는 본 발명은, 튜브액압성형법에 의해 로어아암이 제작되고 스웨이징성형법에 의해 스핀들이 제작되어 스핀들과 로어아암이 마찰용접에 의해 결합되므로 용접 및 절삭공정이 제거되어 작업공수가 줄어들도록 하고, 이로인해 생산비용이 저감되는 효과를 갖는다.In the present invention constructed and operated as described above, the lower arm is manufactured by the tube hydraulic molding method and the spindle is manufactured by the swaging molding method so that the spindle and the lower arm are joined by friction welding, thereby eliminating the welding and cutting process. This reduces the production cost, thereby reducing the production cost.

Claims (1)

원통형 튜브를 액압성형에 의해 벤딩하고 상기 벤딩된 튜브의 중간부를 확관시켜 제작하는 로어아암(7)의 하단에 스웨이징에 의해 상단부 직경이 축소되고 상단부가 소정 길이 전조가공되는 스핀들(3)을 마찰접합함을 특징으로 하는 자동차 로어아암의 제조방법.The upper end diameter is reduced by swaging the lower end of the lower arm 7, which is formed by bending the cylindrical tube by hydraulic molding and expanding the middle part of the bent tube, and friction the spindle 3 having the upper end rolled to a predetermined length. A method of manufacturing an automotive lower arm characterized by bonding.
KR1019970033650A 1997-07-18 1997-07-18 Manufacturing method of lower arm for automobile KR100373253B1 (en)

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KR100373253B1 true KR100373253B1 (en) 2003-05-09

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322632A1 (en) * 1993-07-07 1995-01-12 Vaw Ver Aluminium Werke Ag Method for the production of connecting struts subjected to bending load and torsional forces
JPH0825929A (en) * 1994-07-20 1996-01-30 Honda Motor Co Ltd Suspension arm and manufacture thereof
US5641176A (en) * 1995-03-31 1997-06-24 Mascotech Tubular Products, Inc. Process of hydroforming tubular suspension and frame components for vehicles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322632A1 (en) * 1993-07-07 1995-01-12 Vaw Ver Aluminium Werke Ag Method for the production of connecting struts subjected to bending load and torsional forces
JPH0825929A (en) * 1994-07-20 1996-01-30 Honda Motor Co Ltd Suspension arm and manufacture thereof
US5641176A (en) * 1995-03-31 1997-06-24 Mascotech Tubular Products, Inc. Process of hydroforming tubular suspension and frame components for vehicles

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