WO2013165070A1 - Method for manufacturing wheel hub for wide commercial vehicle - Google Patents

Method for manufacturing wheel hub for wide commercial vehicle Download PDF

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Publication number
WO2013165070A1
WO2013165070A1 PCT/KR2012/011278 KR2012011278W WO2013165070A1 WO 2013165070 A1 WO2013165070 A1 WO 2013165070A1 KR 2012011278 W KR2012011278 W KR 2012011278W WO 2013165070 A1 WO2013165070 A1 WO 2013165070A1
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WO
WIPO (PCT)
Prior art keywords
wheel hub
commercial vehicle
manufacturing
flow forming
forging
Prior art date
Application number
PCT/KR2012/011278
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French (fr)
Korean (ko)
Inventor
하태수
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(주)레오포즈
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Publication of WO2013165070A1 publication Critical patent/WO2013165070A1/en

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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
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B21J13/025—Dies with parts moving along auxiliary lateral directions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • 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
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/30—Making other particular articles wheels or the like wheel rims
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J13/00—Details of machines for forging, pressing, or hammering
    • B21J13/02—Dies or mountings therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/002—Hybrid process, e.g. forging following casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/004—Thixotropic process, i.e. forging at semi-solid state
    • 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
    • B21K1/00—Making machine elements
    • B21K1/28—Making machine elements wheels; discs
    • B21K1/40—Making machine elements wheels; discs hubs
    • 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
    • B22D21/02—Casting exceedingly oxidisable non-ferrous metals, e.g. in inert atmosphere
    • B22D21/04—Casting aluminium or magnesium
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2310/00—Manufacturing methods
    • B60B2310/20—Shaping
    • B60B2310/204—Shaping by moulding, e.g. injection moulding, i.e. casting of plastics material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2310/00—Manufacturing methods
    • B60B2310/20—Shaping
    • B60B2310/208—Shaping by forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B2310/00—Manufacturing methods
    • B60B2310/50—Thermal treatment
    • B60B2310/54—Hardening
    • B60B2310/542—Quenching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
    • Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction 

Definitions

  • the present invention relates to a method for manufacturing a wheel hub for a wide commercial vehicle, and more particularly, to a method for manufacturing a wheel hub for a wide commercial vehicle so as to be capable of power transmission to a wheel for a wide commercial vehicle of a single wheel type.
  • the aluminum wheel for commercial vehicles is composed of a hub part which is integrally formed on one side of the rim part for coupling with a wheel hub connected to the axle, and a low pressure casting, a differential pressure casting, a vacuum suction casting, and a high pressure casting (Die Casting, Squeeze Casting, etc. are being applied, and most aluminum disk wheel companies adopt low pressure casting to secure the soundness of castings.
  • the aluminum wheel manufacturing method has been converted to a forging method having a relatively high quality but relatively high quality, and thus, a reaction high forging method that utilizes the advantages of casting and forging has been adopted.
  • the reaction solidification forging method is a method of forming and producing a complex-shaped product at once in solid-liquid coexistence by dissolving the raw material into a mold and then solidifying and pressurizing it by an appropriate mechanism. It is possible to control the spheroidization, and to increase the strength, there is an advantage of realizing the weight reduction of the product.
  • the hub wheel combined with the aluminum wheel also uses the same reaction high forging method to reduce material usage and cost including product weight reduction. It is required to achieve the effect of saving, forging cycle time reduction, and the like.
  • the present invention has been made in view of the above, when manufacturing a wide commercial vehicle aluminum wheel by reaction high forging method and flow molding method, according to the wheel hub combined with the aluminum wheel also reaction high forging method and flow molding
  • By making it possible to manufacture by the method not only the same manufacturing line as aluminum wheels can be used, but also the weight reduction, material usage and cost reduction, forging cycle time reduction, and tensile and fatigue strength increase due to material change are achieved. It is an object of the present invention to provide a method for manufacturing a wheel hub for a wide commercial vehicle.
  • the present invention for achieving the above object is a method for manufacturing a wheel hub for a wide commercial vehicle, by injecting a molten aluminum melted into the mold, the preliminary formed integrally with the hollow end portion connected to the drive shaft at the outer peripheral end of the hub portion A reaction solid forging step having a forming wheel hub;
  • the preformed wheel hub is fixedly mounted on the flow forming chuck, and then the flow forming roller presses the outer surface of the preforming wheel hub onto the flow forming chuck and is pressed to reduce the designed thickness to the designed thickness and to increase the design width inward.
  • Forming step It provides a wide wheel manufacturing method for a commercial vehicle comprising a.
  • the flow-forming chuck is arranged horizontally, and the flow-forming chuck of the flow-forming part is fixedly inserted into the hollow end portion of the pre-forming wheel hub, so that the flow-forming step can be performed while the pre-forming wheel hub is arranged horizontally. It is characterized by one.
  • the method may further include a T6 heat treatment or a solution heat treatment step performed to process the center hole for the preformed wheel hub after the reaction high forging step, and an aging heat treatment or T6 heat treatment step performed after the flow forming step. It is done.
  • the aluminum material is characterized in that it is adopted as the alloy of the 6000 series or cast material A300 series material for the whole body material to increase the tensile strength.
  • the present invention provides the following effects.
  • the preformed wheel hub after providing a preformed wheel hub in a reaction state by forging and forging by using a 6000 series alloy or cast material A300 material, preferably AA6061 aluminum alloy material, for the whole body material to increase tensile strength,
  • the preformed wheel hub may be flow formed to produce a wheel hub for a wide commercial vehicle.
  • reaction solid forging and flow forming methods using aluminum AA6061 material, product weight, cost reduction, and forging cycles are reduced. Reduced time, increased tensile and fatigue strengths due to material changes.
  • the wheel hub when manufacturing a wide commercial vehicle aluminum wheel composed of a single hub portion, a single rim consisting of the inner rim and the outer rim, the wheel hub can be manufactured by replacing only the mold and the flow molding chuck, thereby making it possible to use the equipment. have.
  • Figure 1a to 1d is a schematic diagram showing the reaction high forging process of the wheel hub manufacturing method for a wide range commercial vehicle according to the present invention
  • Figure 2 is a schematic diagram showing a center hole machining process of the wheel hub manufacturing method for a wide-scale commercial vehicle according to the present invention
  • 3a to 3d is a schematic view showing a flow forming process of the wheel hub manufacturing method for a wide range commercial vehicle according to the present invention
  • Figure 4 is a cross-sectional view showing the final product specifications of the wheel hub for wide commercial vehicles according to the present invention.
  • a brake device of a vehicle is one of heat generating areas, especially in commercial vehicles such as trucks and buses, because the brake capacity is very large, the frictional heat generated between the brake lining and the brake drum during braking is very serious.
  • the present invention is also manufactured by using a wheel hub combined with an aluminum wheel using a reaction high forging method and a flow molding method, such as product weight reduction, material usage and cost reduction, forging cycle time reduction, tension according to the material change
  • a reaction high forging method such as product weight reduction, material usage and cost reduction, forging cycle time reduction, tension according to the material change
  • the main point is to achieve an increase in fatigue strength and the like.
  • FIGS. 1A to 1D are schematic cross-sectional views illustrating a reaction solidification forging process in the manufacturing method of a wheel hub for a wide commercial vehicle according to the present invention.
  • the reaction solid forging device for manufacturing a wheel hub for a wide use vehicle of the present invention is a preform part 100 for preforming the shape of an aluminum wheel, and an upper mold 104 mounted on an upper plate 102 and a blowout part at an upper side thereof. Punch 106 is disposed.
  • a hydraulic cylinder (not shown) is coupled to the upper surface of the upper plate 102, and the upper mold 104 for the reaction high forging of the aluminum wheel hub is integrated on the bottom edge of the upper plate 102. Assembled by the upper plate 102, the blowout punch 106 is mounted to the center of the upper plate 102 to be moved up and down by the drive of the upper eject cylinder (107).
  • the lower mold 108 having a molten metal filling space is assembled on the lower plate 112 at the lower side of the upper mold 104, and the lower working shaft 109 is formed at the center of the lower mold 108.
  • the lower ejection cylinder 111 which is positioned to be capable of raising and lowering and is a lowering driving means of the lower operation shaft 109, is disposed at the bottom of the lower plate 112.
  • a rail-shaped guide 113 is mounted on an outer circumferential lower plate 112 of the lower mold 108, and a side holder 114 is disposed on the rail-shaped guide 113 so as to be able to move forward and backward.
  • the side mold 110 is integrally assembled on the front surface of the side holder 114, and the hydraulic cylinder 115 that is the forward and backward driving means is disposed on the rear surface.
  • reaction forging process proceeded by the reaction forging forging preform 100 configured as follows.
  • the side holder 114 and the side mold 110 are advanced along the rail guide 113 by the driving of the hydraulic cylinder 115 to be in close contact with the side of the lower mold 108 to form a preform of an aluminum wheel.
  • a cavity 116 is formed for shaping the mold (see FIG. 1A).
  • a molten aluminum melted aluminum 6000 system material is injected into the cavity 116, but a molten metal melted in a 6000 alloy or cast material A300 material for the whole body material, preferably an AA6061 material, is melted to increase tensile strength. Inject (see FIGS. 1A and 1B).
  • the upper mold 104 is lowered and the reaction solid forging process of pressurizing the molten metal in the cavity 116 is completed, thereby completing the preform of the aluminum wheel hub (see FIG. 1B).
  • the upper mold 104 is lifted to its original position and the lower working shaft 109 is in the lower mold 108 by driving the lower eject cylinder 111.
  • the aluminum wheel hub 10 which is a preform, is lifted together with the upper mold 104.
  • the ejection plate 118 is moved and disposed by a transport robot (not shown), and at the same time, the upper ejection cylinder ( The ejection punch 106 descending by the driving of the 107 pushes down the aluminum wheel hub 10 which is a preform, so that the aluminum wheel hub 10 is seated on the ejection plate 118.
  • the aluminum wheel hub 10 preformed by reaction forging and seated on the takeout plate 118 is transferred to a center hole processing line, which is the next process, and then center hole processing.
  • a center hole 28 having a predetermined size is formed through a predetermined processing means such as a drill at a center position of the aluminum wheel hub 10 mounted on the work object of the line.
  • 3A to 3C are schematic views showing a flow forming process of the wheel hub manufacturing method for a wide-range commercial vehicle according to the present invention.
  • the flow forming chuck 20 is arranged horizontally, the flow forming roller 22 is formed on the outer diameter portion of the flow forming chuck 20 before and after the predetermined hydraulic drive means. It is arranged to be able to move left / right.
  • the hollow end portion 14 which is connected to the drive shaft is integrally formed at the outer circumferential end of the hub portion 12 of the preformed wheel hub 10, the flow forming chuck in the hollow end portion 14 After inserting and fixing 20, flow molding by the flow-forming roller 22 proceeds (see Fig. 3A).
  • the flow-forming roller 22 moves and press-forms the outer diameter surface of the hollow end portion 14 in a predetermined shape and dimensions
  • the hollow end portion 14 is pressurized and the flow-forming chuck 20
  • the flow forming process is performed to reduce the thickness to the designed thickness while being pressed to the outer diameter of the c) and to increase the design width inwardly (see FIGS. 3B and 3C).
  • the conventional vertical flow molding method has the disadvantage that the machine shakes and the material flow rate is limited when high pressure is applied. Therefore, in the case of a wheel hub of a small size for passenger cars, the material flow amount is small and the thickness is thin, so the flow molding is possible with a small force.
  • the material flow amount is small and the thickness is thin, so the flow molding is possible with a small force.
  • the thickness is thick and a large amount of material must flow, it should be pressurized with a force of 25 tons or more.
  • the flow forming chuck 20 is arranged in a horizontal direction, and the horizontal type flow forming by the flow forming roller 22 is performed as described above. Even if the force is pressed by the flow forming roller 22, there is no shaking of the wheel hub product and the degree of dimension is increased.
  • the wheel hub which is a preformed body
  • the wheel hub integrally formed with the hollow end portion 14 connected to the drive shaft at the outer circumferential end of the hub portion 12 by flow molding ( 10) is completed.
  • the T6 heat treatment solvent-> water tank quenching-> aging
  • solution heat treatment step is carried out to process the center hole for the aluminum wheel hub which is the preform after the reaction forging step, in particular after the flow forming step
  • the aging heat treatment step is performed to maintain a level that satisfies the tensile strength, yield strength, elongation and the like.
  • the T6 heat treatment step is performed for a critical time of 2 to 5 hours at a critical temperature of 160 ° C to 195 ° C. If the temperature is out of the critical temperature and the critical time, precipitation of the aluminum alloy structure does not occur and the desired hardness cannot be obtained.
  • the T6 heat treatment step is preferably performed for a critical time 2-5 hours at a critical temperature of 160 °C ⁇ 195 °C.
  • the wheel hub 10 for the wide commercial vehicle finally formed by flow molding is transferred to the hub hole processing part to process the hub hole, and to process the bolt hole and the vent hole in the hub part together with the CNC machining of the inner and outer surfaces.
  • the step is further proceeded to complete the final wheel hub product for aluminum wide commercial vehicles as shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Forging (AREA)

Abstract

The present invention relates to a method for manufacturing a wheel hub for a wide commercial vehicle, more specifically to a method for manufacturing a wheel hub, for a wide commercial vehicle, which is coupled to a single wheel-type wheel of a wide commercial vehicle so as to allow transmission of power thereto. That is, when an aluminum wheel for a wide commercial vehicle is being manufactured by solid-forging and flow forming methods, the present invention allows also manufacturing a wheel hub, which is coupled to an aluminum wheel, by means of the solid-forging and flow forming methods, thereby providing a method for manufacturing a wheel hub for a wide commercial vehicle which allows the same production line to be used as the aluminum wheel, and additionally allows a reduction in weight of the product as well as reductions in production costs and forging cycle time, and improvements in the tensile and fatigue strengths due to a change in material.

Description

광폭 상용차용 휠허브 제조방법Manufacturing method of wheel hub for wide commercial vehicles
본 발명은 광폭 상용차용 휠허브 제조방법에 관한 것으로서, 더욱 상세하게는 단륜 타입의 광폭 상용차용 휠에 동력 전달 가능하게 결합되는 광폭 상용차용 휠허브 제조방법에 관한 것이다.The present invention relates to a method for manufacturing a wheel hub for a wide commercial vehicle, and more particularly, to a method for manufacturing a wheel hub for a wide commercial vehicle so as to be capable of power transmission to a wheel for a wide commercial vehicle of a single wheel type.
상용차용 알루미늄 휠은 타이어의 안착을 위한 림부와, 차축과 연결된 휠허브와의 결합을 위하여 림부의 일측에 일체로 형성되는 허브부로 구성되며, 저압주조, 차압주조, 진공흡입주조, 고압주조(Die Casting), 용탕주조(Squeeze Casting) 공법 등이 적용되고 있고, 주로 주물의 건전성을 확보하기 위하여 대다수의 알루미늄 디스크 휠 업체에서는 저압주조 공법을 채택하고 있다.The aluminum wheel for commercial vehicles is composed of a hub part which is integrally formed on one side of the rim part for coupling with a wheel hub connected to the axle, and a low pressure casting, a differential pressure casting, a vacuum suction casting, and a high pressure casting (Die Casting, Squeeze Casting, etc. are being applied, and most aluminum disk wheel companies adopt low pressure casting to secure the soundness of castings.
최근에는 알루미늄 휠 제조 방법이 단가는 높지만 품질이 상대적으로 매우 우수한 단조공법으로 전환되고 있는 추세에 따라 주조와 단조의 장점을 잘 활용한 반응고 단조 공법이 채택되고 있다.Recently, the aluminum wheel manufacturing method has been converted to a forging method having a relatively high quality but relatively high quality, and thus, a reaction high forging method that utilizes the advantages of casting and forging has been adopted.
반응고 단조 공법은 소재를 용해하여 금형 내에 투입한 후, 응고와 가압을 적절한 메카니즘에 의하여 실시함으로써, 고액공존 상태에서 복잡한 형상의 제품을 한번에 성형 생산하는 방법으로서, 소재에 직접 고압을 가함으로써 조직의 구상화 제어가 가능하고, 강도를 증가시켜 제품 경량화를 실현할 수 있는 장점이 있다.The reaction solidification forging method is a method of forming and producing a complex-shaped product at once in solid-liquid coexistence by dissolving the raw material into a mold and then solidifying and pressurizing it by an appropriate mechanism. It is possible to control the spheroidization, and to increase the strength, there is an advantage of realizing the weight reduction of the product.
이러한 반응고 단조 공법을 이용하여, 카고 및 트레일러의 뒷바퀴용 알루미늄 휠이 제조되고 있는 바, 이에 맞추어 알루미늄 휠과 결합되는 허브휠도 동일한 반응고 단조 공법을 사용하여 제품 중량 감소를 비롯한 소재 사용량 및 원가 절감, 단조 사이클 타임 감소 등의 효과를 얻을 수 있도록 함이 요구되고 있다.By using this reaction forging method, aluminum wheels for the rear wheels of cargo and trailers are manufactured. Accordingly, the hub wheel combined with the aluminum wheel also uses the same reaction high forging method to reduce material usage and cost including product weight reduction. It is required to achieve the effect of saving, forging cycle time reduction, and the like.
본 발명은 상기와 같은 점을 감안하여 안출한 것으로서, 광폭 상용차용 알루미늄 휠을 반응고 단조공법 및 유동성형 공법으로 제조할 때, 이에 맞추어 알루미늄 휠과 결합되는 휠허브도 반응고 단조공법 및 유동성형 공법 등에 의하여 제조될 수 있도록 함으로써, 알루미늄 휠과 동일한 제조라인을 사용할 수 있을 뿐만 아니라, 제품 중량 감소를 비롯하여 소재 사용량 및 원가 절감, 단조 사이클 타임 감소, 소재 변경에 따른 인장 및 피로강도 증가 등을 이룰 수 있는 광폭 상용차용 휠허브 제조방법을 제공하는데 그 목적이 있다.The present invention has been made in view of the above, when manufacturing a wide commercial vehicle aluminum wheel by reaction high forging method and flow molding method, according to the wheel hub combined with the aluminum wheel also reaction high forging method and flow molding By making it possible to manufacture by the method, not only the same manufacturing line as aluminum wheels can be used, but also the weight reduction, material usage and cost reduction, forging cycle time reduction, and tensile and fatigue strength increase due to material change are achieved. It is an object of the present invention to provide a method for manufacturing a wheel hub for a wide commercial vehicle.
상기한 목적을 달성하기 위한 본 발명은 광폭 상용차용 휠허브 제조 방법에 있어서, 알루미늄 소재를 용해시킨 용탕을 금형내에 주입하여, 허브부의 외주단에 드라이브샤프트와 연결되는 중공형 엔드부가 일체로 형성된 예비성형 휠허브를 구비하는 반응고 단조 단계와; 예비성형 휠허브를 유동성형용 척에 고정 장착한 다음, 유동성형용 롤러에 의하여 예비성형 휠허브의 외표면이 유동성형용 척에 가압되며 눌려지면서 설계된 두께로 줄어드는 동시에 내측방향으로 설계폭까지 늘어나도록 한 유동성형 단계; 를 포함하는 것을 특징으로 하는 광폭 상용차용 휠 제조 방법을 제공한다.The present invention for achieving the above object is a method for manufacturing a wheel hub for a wide commercial vehicle, by injecting a molten aluminum melted into the mold, the preliminary formed integrally with the hollow end portion connected to the drive shaft at the outer peripheral end of the hub portion A reaction solid forging step having a forming wheel hub; The preformed wheel hub is fixedly mounted on the flow forming chuck, and then the flow forming roller presses the outer surface of the preforming wheel hub onto the flow forming chuck and is pressed to reduce the designed thickness to the designed thickness and to increase the design width inward. Forming step; It provides a wide wheel manufacturing method for a commercial vehicle comprising a.
특히, 상기 유동성형용 척을 수평 배열하고, 예비성형용 휠허브의 중공형 엔드부내에 유동성형부의 유동성형용 척을 삽입 고정하여, 예비성형 휠허브가 수평 배열된 상태에서 유동 성형 단계가 진행될 수 있도록 한 것을 특징으로 한다.In particular, the flow-forming chuck is arranged horizontally, and the flow-forming chuck of the flow-forming part is fixedly inserted into the hollow end portion of the pre-forming wheel hub, so that the flow-forming step can be performed while the pre-forming wheel hub is arranged horizontally. It is characterized by one.
또한, 상기 반응고 단조 단계 후, 예비성형 휠허브에 대하여 센터홀을 가공하기 위해 실시하는 T6 열처리 또는 용체화 열처리 단계와, 유동 성형 단계후 실시하는 시효 열처리 혹은 T6 열처리 단계를 더 포함하는 것을 특징으로 한다.The method may further include a T6 heat treatment or a solution heat treatment step performed to process the center hole for the preformed wheel hub after the reaction high forging step, and an aging heat treatment or T6 heat treatment step performed after the flow forming step. It is done.
바람직하게는, 상기 알루미늄 소재는 인장강도 증대를 위하여 전신재용 6000계열의 합금이나 주조재 A300계열 소재로 채택된 것을 특징으로 한다.Preferably, the aluminum material is characterized in that it is adopted as the alloy of the 6000 series or cast material A300 series material for the whole body material to increase the tensile strength.
상기한 과제 해결 수단을 통하여, 본 발명은 다음과 같은 효과를 제공한다.Through the above problem solving means, the present invention provides the following effects.
본 발명에 따르면, 인장강도 증대를 위하여 전신재용 6000계열의 합금이나 주조재 A300계열 소재, 바람직하게는 AA6061 알루미늄 합금소재를 이용하여 반응고 단조하여 반응고 상태인 예비 성형 휠허브를 구비한 후, 예비 성형된 휠허브를 유동 성형(Flow Forming)하여 광폭 상용차용 휠허브를 제조할 수 있다.According to the present invention, after providing a preformed wheel hub in a reaction state by forging and forging by using a 6000 series alloy or cast material A300 material, preferably AA6061 aluminum alloy material, for the whole body material to increase tensile strength, The preformed wheel hub may be flow formed to produce a wheel hub for a wide commercial vehicle.
특히, 기존에 주강 또는 주철재를 이용하여 주조 공법으로 제조하던 방법과 달리, 알루미늄 AA6061 소재를 이용하여 반응고 단조 및 유동성형 공법을 적용함에 따라 제품 중량 감소를 비롯하여 소재 사용량 및 원가 절감, 단조 사이클 타임 감소, 소재 변경에 따른 인장 및 피로강도 증가 등을 이룰 수 있다.In particular, unlike conventional methods of casting and casting using cast steel or cast iron materials, by applying reaction solid forging and flow forming methods using aluminum AA6061 material, product weight, cost reduction, and forging cycles are reduced. Reduced time, increased tensile and fatigue strengths due to material changes.
특히, 단일 허브부와, 내측림부와 외측림부로 이루어진 단일 림부로 구성된 광폭 상용차용 알루미늄 휠을 제조할 때, 그 금형 및 유동성형용 척만을 교체하여 휠허브를 제조할 수 있으므로, 설비 공용화를 이룰 수 있다.In particular, when manufacturing a wide commercial vehicle aluminum wheel composed of a single hub portion, a single rim consisting of the inner rim and the outer rim, the wheel hub can be manufactured by replacing only the mold and the flow molding chuck, thereby making it possible to use the equipment. have.
도 1a 내지 도 1d는 본 발명에 따른 광폭 상용차용 휠허브 제조방법의 반응고 단조 공정을 나타내는 개략도,Figure 1a to 1d is a schematic diagram showing the reaction high forging process of the wheel hub manufacturing method for a wide range commercial vehicle according to the present invention,
도 2는 본 발명에 따른 광폭 상용차용 휠허브 제조방법의 센터홀 가공 공정을 나타내는 개략도,Figure 2 is a schematic diagram showing a center hole machining process of the wheel hub manufacturing method for a wide-scale commercial vehicle according to the present invention,
도 3a 내지 도 3d는 본 발명에 따른 광폭 상용차용 휠허브 제조방법의 유동 성형 공정을 나타내는 개략도,3a to 3d is a schematic view showing a flow forming process of the wheel hub manufacturing method for a wide range commercial vehicle according to the present invention,
도 4는 본 발명에 따른 광폭 상용차용 휠허브의 최종 제품 사양을 나타낸 단면도.Figure 4 is a cross-sectional view showing the final product specifications of the wheel hub for wide commercial vehicles according to the present invention.
이하, 본 발명의 바람직한 실시예를 첨부도면을 참조로 상세하게 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
일반적으로 차량의 브레이크 장치는 열 발생이 심한 부위 중 하나이며, 특히 트럭, 버스 등의 상용차량에서는 브레이크 용량이 매우 크기 때문에 제동시 브레이크 라이닝과 브레이크 드럼 사이에 발생하는 마찰열이 매우 심각하다.In general, a brake device of a vehicle is one of heat generating areas, especially in commercial vehicles such as trucks and buses, because the brake capacity is very large, the frictional heat generated between the brake lining and the brake drum during braking is very serious.
이러한 마찰열은 브레이크 성능에 악영향을 줄 뿐만 아니라, 드라이브샤프트(액슬 샤프트)와 동력 전달 가능하게 연결된 휠허브의 엔드부는 섭동 및 회전부분이므로 열 발생과 함께 수명 단축을 초래할 수 있으며, 이러한 단점이 초래됨은 기존 휠허브가 열방출 및 냉각 시간이 오래 걸리는 주강 또는 주철재를 이용하여 제조됨에 또 다른 이유를 찾을 수 있다.This frictional heat not only adversely affects the brake performance, but also the end of the wheel hub which is connected to the drive shaft (axle shaft) so as to transmit power can be a perturbation and a rotating part, which can lead to a shortened life with heat generation. Another reason may be found because the existing wheel hubs are manufactured using cast steel or cast iron, which takes long time for heat release and cooling.
이를 위해, 본 발명은 알루미늄 휠과 결합되는 휠허브도 반응고 단조공법 및 유동성형 공법 등을 이용하여 제조함으로써, 제품 중량 감소를 비롯하여 소재 사용량 및 원가 절감, 단조 사이클 타임 감소, 소재 변경에 따른 인장 및 피로강도 증가 등을 이룰 수 있도록 한 점에 주안점이 있다.To this end, the present invention is also manufactured by using a wheel hub combined with an aluminum wheel using a reaction high forging method and a flow molding method, such as product weight reduction, material usage and cost reduction, forging cycle time reduction, tension according to the material change The main point is to achieve an increase in fatigue strength and the like.
첨부한 도 1a 내지 도 1d는 본 발명에 따른 광폭 상용차용 휠허브 제조방법 중 반응고 단조 공정을 설명하는 개략적 단면이다.1A to 1D are schematic cross-sectional views illustrating a reaction solidification forging process in the manufacturing method of a wheel hub for a wide commercial vehicle according to the present invention.
본 발명의 광폭 사용차용 휠허브 제조를 위한 반응고 단조 장치는 알루미늄 휠의 형상을 예비 성형하는 예비성형부(100)로서, 상부쪽에는 상부 플레이트(102)에 장착되는 상부 금형(104)과 취출 펀치(106)가 배치된다.The reaction solid forging device for manufacturing a wheel hub for a wide use vehicle of the present invention is a preform part 100 for preforming the shape of an aluminum wheel, and an upper mold 104 mounted on an upper plate 102 and a blowout part at an upper side thereof. Punch 106 is disposed.
보다 상세하게는, 상기 상부플레이트(102)의 상면에는 유압실린더(미도시됨)가 결합되고, 상부플레이트(102)의 저면 테두리에는 알루미늄 휠허브의 반응고 단조를 위한 상부 금형(104)이 일체로 조립되며, 상부플레이트(102)의 중앙부에는 취출 펀치(106)가 상부 이젝트 실린더(107)의 구동에 의하여 승하강 가능하게 장착된다.More specifically, a hydraulic cylinder (not shown) is coupled to the upper surface of the upper plate 102, and the upper mold 104 for the reaction high forging of the aluminum wheel hub is integrated on the bottom edge of the upper plate 102. Assembled by the upper plate 102, the blowout punch 106 is mounted to the center of the upper plate 102 to be moved up and down by the drive of the upper eject cylinder (107).
이러한 상부 금형(104)의 수직방향 아래쪽에는 용탕충진공간을 갖는 하부금형(108)이 하부 플레이트(112)상에 조립 배치되는 바, 상기 하부금형(108)의 중앙부에는 하부작동축(109)이 승하강 가능하게 위치되고, 상기 하부플레이트(112)의 저부에는 하부작동축(109)의 승하강 구동수단인 하부 이젝트 실린더(111)가 배치된다.The lower mold 108 having a molten metal filling space is assembled on the lower plate 112 at the lower side of the upper mold 104, and the lower working shaft 109 is formed at the center of the lower mold 108. The lower ejection cylinder 111, which is positioned to be capable of raising and lowering and is a lowering driving means of the lower operation shaft 109, is disposed at the bottom of the lower plate 112.
또한, 상기 하부금형(108)의 외주부쪽 하부플레이트(112)상에는 레일형 가이드(113)가 장착되고, 이 레일형 가이드(113)에는 전후진 가능하게 사이드 홀더(114)가 배치된다.In addition, a rail-shaped guide 113 is mounted on an outer circumferential lower plate 112 of the lower mold 108, and a side holder 114 is disposed on the rail-shaped guide 113 so as to be able to move forward and backward.
이때, 상기 사이드홀더(114)의 전면에는 사이드금형(110)이 일체로 조립되고, 그 후면에는 전후진 구동수단인 유압실린더(115)가 배치된다.At this time, the side mold 110 is integrally assembled on the front surface of the side holder 114, and the hydraulic cylinder 115 that is the forward and backward driving means is disposed on the rear surface.
이렇게 구성된 반응고 단조용 예비성형부(100)에 의하여 진행되는 반응고 단조 공정을 살펴보면 다음과 같다.Looking at the reaction forging process proceeded by the reaction forging forging preform 100 configured as follows.
먼저, 유압실린더(115)의 구동에 의하여 사이드홀더(114) 및 사이드금형(110)이 레일형 가이드(113)를 따라 전진하여, 하부금형(108)의 측부에 밀착되어, 알루미늄 휠의 예비성형체를 성형하기 위한 캐비티(116)가 형성된다(도 1a 참조).First, the side holder 114 and the side mold 110 are advanced along the rail guide 113 by the driving of the hydraulic cylinder 115 to be in close contact with the side of the lower mold 108 to form a preform of an aluminum wheel. A cavity 116 is formed for shaping the mold (see FIG. 1A).
이어서, 상기 캐비티(116)내에 알루미늄 6000계 전신재 소재를 녹인 용탕을 주입하되, 인장강도 증대를 위하여 전신재용 6000계열의 합금이나 주조재 A300계열 소재를 녹인 용탕, 바람직하게는 AA6061 소재를 녹인 용탕을 주입한다(도 1a 및 도 1b 참조).Subsequently, a molten aluminum melted aluminum 6000 system material is injected into the cavity 116, but a molten metal melted in a 6000 alloy or cast material A300 material for the whole body material, preferably an AA6061 material, is melted to increase tensile strength. Inject (see FIGS. 1A and 1B).
다음으로, 상기 상부금형(104)이 하강하여 캐비티(116)내의 용탕을 가압하는 반응고 단조 과정이 이루어지게 됨으로써, 알루미늄 휠허브의 예비성형체가 완성된다(도 1b 참조).Next, the upper mold 104 is lowered and the reaction solid forging process of pressurizing the molten metal in the cavity 116 is completed, thereby completing the preform of the aluminum wheel hub (see FIG. 1B).
연이어, 도 1c에 도시된 바와 같이 상기 상부금형(104)이 본래 위치로 승강하는 동시에 하부 이젝트 실린더(111)의 구동에 의하여 하부작동축(109)이 하부금형(108)내에 있던 예비성형체의 저면을 밀어 올리게 됨으로써, 예비성형체인 알루미늄 휠허브(10)가 상부금형(104)과 함께 승강하게 된다.Subsequently, as shown in FIG. 1C, the upper mold 104 is lifted to its original position and the lower working shaft 109 is in the lower mold 108 by driving the lower eject cylinder 111. By pushing up, the aluminum wheel hub 10, which is a preform, is lifted together with the upper mold 104.
이어서, 도 1d에 도시된 바와 같이 상기 상부금형(104)이 정지된 상태에서 그 아래쪽에 취출 플레이트(118)가 이송로봇(미도시됨)에 의하여 이동하여 배치되고, 이와 동시에 상기 상부 이젝트 실린더(107)의 구동에 의하여 하강하는 취출펀치(106)가 예비성형체인 알루미늄 휠허브(10)를 밀어 내리게 됨으로써, 알루미늄 휠허브(10)가 취출 플레이트(118)상에 안착된다.Subsequently, in the state where the upper mold 104 is stopped as shown in FIG. 1D, the ejection plate 118 is moved and disposed by a transport robot (not shown), and at the same time, the upper ejection cylinder ( The ejection punch 106 descending by the driving of the 107 pushes down the aluminum wheel hub 10 which is a preform, so that the aluminum wheel hub 10 is seated on the ejection plate 118.
다음으로, 첨부한 도 2에서 보는 바와 같이 반응고 단조에 의하여 예비성형되어 취출 플레이트(118)상에 안착되어진 알루미늄 휠허브(10)는 다음 공정인 센터홀 가공 라인으로 이송된 후, 센터홀 가공 라인의 작업대상에 올려진 알루미늄 휠허브(10)의 중심 위치에 드릴과 같은 소정의 가공수단을 이용하여 소정 크기의 센터홀(28)이 관통 형성된다.Next, as shown in the accompanying FIG. 2, the aluminum wheel hub 10 preformed by reaction forging and seated on the takeout plate 118 is transferred to a center hole processing line, which is the next process, and then center hole processing. A center hole 28 having a predetermined size is formed through a predetermined processing means such as a drill at a center position of the aluminum wheel hub 10 mounted on the work object of the line.
여기서, 본 발명에 따른 광폭 상용차용 휠허브 제조 방법의 유동 성형 공정을 설명하면 다음과 같다.Here, the flow forming process of the wheel hub manufacturing method for a wide commercial vehicle according to the present invention will be described.
첨부한 도 3a 내지 도 3c는 본 발명에 따른 광폭 상용차용 휠허브 제조 방법의 유동 성형 공정을 나타내는 개략도이다.3A to 3C are schematic views showing a flow forming process of the wheel hub manufacturing method for a wide-range commercial vehicle according to the present invention.
상기와 같이 알루미늄 소재를 용해시킨 용탕을 금형내에 주입하여, 허브부(12)의 외주단에 드라이브샤프트와 연결되는 중공형 엔드부(14)가 일체로 형성된 예비성형 휠허브(10)를 반응고 단조 단계를 통하여 구비하고, 이어서 예비성형 휠허브(10)를 유동성형용 척(20)에 고정 장착한 다음, 유동성형용 롤러(22)에 의하여 예비성형 휠허브(10)의 외표면이 유동성형용 척(20)에 가압되며 눌려지면서 설계된 두께로 줄어드는 동시에 내측방향으로 설계폭까지 늘어나도록 한 유동성형 단계가 진행된다.Injecting the molten aluminum melted in the mold as described above, and reacts the preformed wheel hub 10 formed integrally with the hollow end portion 14 connected to the drive shaft at the outer peripheral end of the hub portion 12 It is provided through the forging step, and then fixedly mounted to the flow-forming chuck 20, the outer surface of the pre-formed wheel hub 10 by the flow-forming roller 22 is the flow-forming chuck The flow forming step is carried out so that it is pressed to 20 and reduced to the designed thickness while being pressed to the design width inwardly.
이를 위해, 먼저 상기 유동성형을 위한 구성으로서, 유동성형용 척(20)이 수평 배열되고, 유동성형용 척(20)의 외경부에는 유동성형용 롤러(22)가 소정의 유압구동수단에 의하여 전/후/좌/우 이송 가능하게 배치된다.To this end, first, as a configuration for the flow molding, the flow forming chuck 20 is arranged horizontally, the flow forming roller 22 is formed on the outer diameter portion of the flow forming chuck 20 before and after the predetermined hydraulic drive means. It is arranged to be able to move left / right.
이때, 상기 예비성형 휠허브(10)의 허브부(12)의 외주단에 드라이브샤프트와 연결되는 중공형 엔드부(14)가 일체로 형성되는 바, 중공형 엔드부(14)내에 유동성형용 척(20)을 삽입 고정시킨 다음, 유동성형용 롤러(22)에 의한 유동 성형이 진행된다(도 3a 참조).At this time, the hollow end portion 14 which is connected to the drive shaft is integrally formed at the outer circumferential end of the hub portion 12 of the preformed wheel hub 10, the flow forming chuck in the hollow end portion 14 After inserting and fixing 20, flow molding by the flow-forming roller 22 proceeds (see Fig. 3A).
따라서, 상기 유동성형용 롤러(22)가 이동하면서 중공형 엔드부(14)의 외경면을 소정의 형상 및 치수대로 가압 성형함에 따라, 중공형 엔드부(14)가 가압되는 동시에 유동성형용 척(20)의 외경에 가압되며 눌려지면서 설계된 두께로 줄어드는 동시에 내측방향으로 설계폭까지 늘어나도록 한 유동성형 과정이 진행된다(도 3b 및 도 3c 참조).Therefore, as the flow-forming roller 22 moves and press-forms the outer diameter surface of the hollow end portion 14 in a predetermined shape and dimensions, the hollow end portion 14 is pressurized and the flow-forming chuck 20 The flow forming process is performed to reduce the thickness to the designed thickness while being pressed to the outer diameter of the c) and to increase the design width inwardly (see FIGS. 3B and 3C).
한편, 기존 수직 방식의 유동성형 방식은 고압을 가할 경우 기계가 흔들리고 소재 유동량이 제한되는 단점이 있기 때문에 승용차용 소형 규격의 휠허브 경우에는 소재 유동량이 적고, 두께도 얇아 적은 힘으로 유동 성형이 가능하지만, 본 발명에 따른 광폭 상용차용 휠허브를 제조하는 경우에는 두께가 두껍고 대량의 소재를 유동시켜야 하므로 25톤 이상의 힘으로 가압하여야 한다.On the other hand, the conventional vertical flow molding method has the disadvantage that the machine shakes and the material flow rate is limited when high pressure is applied. Therefore, in the case of a wheel hub of a small size for passenger cars, the material flow amount is small and the thickness is thin, so the flow molding is possible with a small force. However, when manufacturing the wheel hub for wide commercial vehicles according to the present invention, because the thickness is thick and a large amount of material must flow, it should be pressurized with a force of 25 tons or more.
이를 위해, 본 발명의 광폭 휠허브 제조 방법에서는 유동성형용 척(20)을 수평방향으로 배열하여, 상기와 같이 유동성형용 롤러(22)에 의한 수평 방식 유동 성형을 실시하게 되는 것이며, 이에 25톤 이상의 힘이 유동성형용 롤러(22)에 의하여 가압되어도 휠허브 제품의 흔들림이 없고 치수 정도가 높아지게 된다.To this end, in the manufacturing method of the wide wheel hub of the present invention, the flow forming chuck 20 is arranged in a horizontal direction, and the horizontal type flow forming by the flow forming roller 22 is performed as described above. Even if the force is pressed by the flow forming roller 22, there is no shaking of the wheel hub product and the degree of dimension is increased.
이렇게, 반응고 단조 과정에 의하여 예비성형체인 휠허브가 구비된 후, 유동 성형에 의하여 허브부(12)의 외주단에 드라이브샤프트와 연결되는 중공형 엔드부(14)가 일체로 형성된 휠허브(10)로 제조 완료된다.Thus, after the wheel hub, which is a preformed body, is provided by the reaction forging process, the wheel hub integrally formed with the hollow end portion 14 connected to the drive shaft at the outer circumferential end of the hub portion 12 by flow molding ( 10) is completed.
한편, 상기 반응고 단조 단계후의 예비성형체인 알루미늄 휠허브에 대하여 센터홀을 가공하기 위해 실시하는 T6 열처리(용체 -> 수조급냉 -> 시효) 또는 용체화 열처리 단계가 진행되고, 특히 유동성형 단계후 시효 열처리 단계가 진행되어 인장강도, 항복강도, 연신율 등을 만족하는 수준으로 유지시킬 수 있다.On the other hand, the T6 heat treatment (solvent-> water tank quenching-> aging) or solution heat treatment step is carried out to process the center hole for the aluminum wheel hub which is the preform after the reaction forging step, in particular after the flow forming step The aging heat treatment step is performed to maintain a level that satisfies the tensile strength, yield strength, elongation and the like.
상기 T6 열처리 단계는 임계온도 160℃~195℃에서 임계시간 2~5시간 동안 진행되는 바, 이 임계온도 및 임계시간을 벗어나면 알루미늄 합금조직의 석출이 일어나지 않고 원하는 경도를 얻을 수 없다.The T6 heat treatment step is performed for a critical time of 2 to 5 hours at a critical temperature of 160 ° C to 195 ° C. If the temperature is out of the critical temperature and the critical time, precipitation of the aluminum alloy structure does not occur and the desired hardness cannot be obtained.
따라서, 상기 T6 열처리 단계는 임계온도 160℃~195℃에서 임계시간 2~5시간 동안 진행하는 것이 바람직하다.Therefore, the T6 heat treatment step is preferably performed for a critical time 2-5 hours at a critical temperature of 160 ℃ ~ 195 ℃.
이때, 상기 용체화 열처리단계만을 진행하는 경우에도 알루미늄 합금조직의 석출을 지지하고, 원하는 경도를 얻을 수 있도록 500℃~550℃에서 3~7시간 동안 용체화 처리를 하는 것이 바람직하다.In this case, even when only the solution heat treatment step is performed, it is preferable to perform the solution treatment for 3 to 7 hours at 500 ° C. to 550 ° C. so as to support the precipitation of the aluminum alloy structure and obtain a desired hardness.
또한, 유동 성형에 의하여 최종 성형된 광폭 상용차용 휠허브(10)는 허브홀 가공부로 이송되어 허브홀이 가공되는 단계와, 내외면에 대한 CNC 가공과 함께 허브부에 볼트홀 및 벤트홀을 가공하는 단계가 더 진행되어, 첨부한 도 4에 도시된 바와 같은 최종적인 알루미늄 광폭 상용차용 휠허브 제품으로 완성된다.In addition, the wheel hub 10 for the wide commercial vehicle finally formed by flow molding is transferred to the hub hole processing part to process the hub hole, and to process the bolt hole and the vent hole in the hub part together with the CNC machining of the inner and outer surfaces. The step is further proceeded to complete the final wheel hub product for aluminum wide commercial vehicles as shown in FIG.

Claims (5)

  1. 광폭 상용차용 휠허브 제조 방법에 있어서,In the wheel hub manufacturing method for wide commercial vehicles,
    알루미늄 소재를 용해시킨 용탕을 금형내에 주입하여, 허브부(12)의 외주단에 드라이브샤프트와 연결되는 중공형 엔드부(14)가 일체로 형성된 예비성형 휠허브(10)를 구비하는 반응고 단조 단계와;Injecting molten aluminum dissolved therein into a mold, and forging a reaction solid forging having a preformed wheel hub 10 integrally formed with a hollow end portion 14 connected to a drive shaft at an outer circumferential end of the hub portion 12. Steps;
    예비성형 휠허브(10)를 유동성형용 척(20)에 고정 장착한 다음, 유동성형용 롤러(22)에 의하여 예비성형 휠허브(10)의 외표면이 유동성형용 척(20)에 가압되며 눌려지면서 설계된 두께로 줄어드는 동시에 내측방향으로 설계폭까지 늘어나도록 한 유동성형 단계;The preformed wheel hub 10 is fixedly mounted to the flow forming chuck 20, and then the outer surface of the preformed wheel hub 10 is pressed and pressed by the flow forming chuck 20 by the flow forming roller 22. A flow forming step of reducing the designed thickness and extending inwardly to the design width;
    를 포함하는 것을 특징으로 하는 광폭 상용차용 휠허브 제조 방법.Wheel hub manufacturing method for a wide range commercial vehicle comprising a.
  2. 청구항 1에 있어서,The method according to claim 1,
    상기 유동성형용 척(20)을 수평 배열하고, 예비성형용 휠허브(10)의 중공형 엔드부(14)내에 유동성형부의 유동성형용 척(20)을 삽입 고정하여, 예비성형 휠허브(10)가 수평 배열된 상태에서 유동 성형 단계가 진행될 수 있도록 한 것을 특징으로 하는 광폭 상용차용 휠허브 제조 방법.The flow forming chuck 20 is arranged horizontally, and the flow forming chuck 20 is inserted into the hollow end portion 14 of the preforming wheel hub 10 to fix the preforming wheel hub 10. Method for manufacturing a wheel hub for a wide-range commercial vehicle, characterized in that the flow forming step can be carried out in a horizontal arrangement.
  3. 청구항 1에 있어서,The method according to claim 1,
    상기 반응고 단조 단계 후, 예비성형 휠허브(10)에 대하여 센터홀(28)을 가공하기 위해 실시하는 T6 열처리 또는 용체화 열처리 단계와, 유동 성형 단계후 실시하는 시효 열처리 혹은 T6 열처리 단계를 더 포함하는 것을 특징으로 하는 광폭 상용차용 휠허브 제조 방법.After the reaction forging step, the T6 heat treatment or solution heat treatment step for processing the center hole 28 for the preformed wheel hub 10, and the aging heat treatment or T6 heat treatment step performed after the flow molding step Wheel hub manufacturing method for a wide range commercial vehicle comprising a.
  4. 청구항 1에 있어서,The method according to claim 1,
    상기 알루미늄 소재는 인장강도 증대를 위하여 전신재용 6000계열의 합금이나 주조재 A300계열 소재로 채택된 것을 특징으로 하는 광폭 상용차용 휠허브 제조 방법.The aluminum material is a wheel hub manufacturing method for a wide-range commercial vehicle, characterized in that it is adopted as a series of 6000 series alloy or cast material A300 series material for increasing the tensile strength.
  5. 청구항 3에 있어서,The method according to claim 3,
    상기 T6 열처리 단계는 160℃~195℃에서 2~5시간 동안 진행되고, 상기 용체화 열처리단계는 500℃~550℃에서 3~7시간 동안 진행되는 것을 특징으로 하는 광폭 상용차용 휠허브 제조 방법.The T6 heat treatment step is performed for 2 to 5 hours at 160 ℃ ~ 195 ℃, the solution heat treatment step is a wheel hub manufacturing method for a wide commercial vehicle, characterized in that for 3 to 7 hours at 500 ℃ ~ 550 ℃.
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