WO2012160697A1 - ヘッダエクステンションの成形方法及び車体構造 - Google Patents
ヘッダエクステンションの成形方法及び車体構造 Download PDFInfo
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- WO2012160697A1 WO2012160697A1 PCT/JP2011/062116 JP2011062116W WO2012160697A1 WO 2012160697 A1 WO2012160697 A1 WO 2012160697A1 JP 2011062116 W JP2011062116 W JP 2011062116W WO 2012160697 A1 WO2012160697 A1 WO 2012160697A1
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- header
- header extension
- side inner
- roof side
- region
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/06—Fixed roofs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D65/00—Designing, manufacturing, e.g. assembling, facilitating disassembly, or structurally modifying motor vehicles or trailers, not otherwise provided for
- B62D65/02—Joining sub-units or components to, or positioning sub-units or components with respect to, body shell or other sub-units or components
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/40—Direct resistance heating
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- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- 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
Definitions
- the present invention relates to a technique for forming a header extension for joining a front header and a roof side inner, and a vehicle body structure including a front header, a roof side inner, and a header extension.
- Patent Document 1 in the header extension that connects the front header and the roof side inner, the joint strength on the roof side inner side is made weaker than the joint strength on the front header side, thereby making a part of the joint on the roof side inner side.
- a technique for breaking the sheet is disclosed. According to this, when a load is applied to the roof, the stress applied to the header extension can be released to the joint portion on the roof side inner side, so that the deformation of the roof side inner is suppressed and the front windshield glass is cracked. It is disclosed that it can be prevented beforehand.
- Patent Document 1 it is necessary to join the joint strength on the roof side inner side more weakly than the joint strength on the front header side, resulting in difficulty in workability.
- An object of the present invention is to provide a vehicle body structure in which the folding mode when a load is applied to the roof is well controlled and the productivity is improved.
- a first aspect of the present invention is a method of forming a header extension that joins a front header and a roof side inner, wherein the front header is energized when a material is energized and a part thereof is heated to a quenching temperature or higher.
- the heating side is heated so that the side is equal to or higher than the quenching temperature, and the roof side inner side is lower than the quenching temperature, the material after the heating is pressed, formed into the shape of the header extension, quenched and quenched To do.
- the header extension is provided so as to extend from the side coupled with the front header to the side coupled with the roof side inner, and can be surface-joined with the roof side inner on the side coupled with the roof side inner.
- a flange having a surface orthogonal to the extension surface of the header extension is formed, and the material is formed so that the roof side inner side region corresponds to the flange of the header extension with respect to the other region.
- An area that is formed as a wide area in a direction orthogonal to the extension direction of the extension, and the area on the front header side is narrower in the direction orthogonal to the extension direction of the header extension than other areas
- the energization heating is performed along the extending direction of the header extension. Rukoto is preferable.
- a second aspect of the present invention is a vehicle body structure including a front header, a roof side inner, and a header extension that joins the front header and the roof side inner, and the front header side of the header extension is baked.
- the roof side inner side is a non-quenched region.
- the present invention it is possible to provide a vehicle body structure in which the folding mode when a load is applied to the roof is well controlled and the productivity is improved.
- the vehicle body structure of the present embodiment includes a header extension 1, and a front header 2 and a roof side inner 3 connected by the header extension 1.
- the header extension 1 is a member that connects a front header 2 disposed at an upper portion on the front side of the vehicle body and a roof side inner 3 disposed outside the vehicle body. As shown in FIG. 2, the header extension 1 has a hat-shaped cross section, and an outer end portion of the vehicle body is formed in a flange shape so that it can be joined to the roof side inner 3 on the surface. In other words, a joining flange is formed at the vehicle body outer end portion of the header extension 1 so as to be flush with the side surface of the roof side inner 3. The header extension 1 formed in this way is joined to the front header 2 and the roof side inner 3 at the vehicle body inner end and outer end, respectively.
- the front header 2 is provided along the vehicle body width direction, and is coupled to the roof side inner 3 via the header extension 1 at the end in the width direction.
- the front header 2 supports the upper part of the front windshield glass and the front part of the roof panel.
- the roof side inner 3 is provided in the longitudinal direction of the vehicle body, and is disposed on the side of the front header 2.
- the roof side inner 3 supports the side part of the front windshield glass.
- the header extension 1 is formed by a so-called hot press in which a part is heated to a quenching temperature by energization heating and then subjected to press molding and quenching at the same time.
- a pair of electrodes 20, 20 are attached to a flat plate material 10, and the material 10 is heated by energizing the electrodes 20, 20.
- the material 10 heated to a predetermined temperature is placed in a mold and pressed to rapidly cool and quench, and to be molded into a shape corresponding to the molding surface of the mold. In this way, the material 10 is hot press molded to obtain the shape of the header extension 1.
- the material 10 is a flat plate formed in a trapezoidal shape in which the width (front-rear width) on the outside of the vehicle body is larger than the width on the inside.
- the outer width is made larger than the inner portion that is simply formed into a hat shape in accordance with the shape of the header extension 1. .
- the outer width of the material 10 is formed large in order to ensure the rigidity of the flange portion.
- the material 10 is divided into three regions, a narrow region A1, an intermediate region A2, and a wide region A3 in order from the inside to the outside of the vehicle body.
- the narrow region A1 is a substantially rectangular region located inside the vehicle body.
- the wide area A3 is a substantially rectangular area that is located outside the vehicle body and includes a portion corresponding to the flange of the header extension 1.
- the intermediate area A2 is an area between the narrow area A1 and the wide area A3.
- the electrodes 20 and 20 are connected to the inner end and the outer end of the material 10.
- Energization is performed in the inner-outer direction, and the material 10 is arranged and press-molded so that the energization direction and the vehicle body direction are equal. That is, the energization direction for the material 10 is the vehicle body width direction.
- energization is performed across the narrow region A1, the intermediate region A2, and the wide region A3.
- the cross-sectional area in the direction orthogonal to the energizing direction is smaller in the narrow area A1 than in the other areas A2 and A3, the resistance value is increased, the heating amount is increased, and the temperature is increased. Similarly, since the heating amount of the wide area A3 is reduced, the temperature is lowered.
- the narrow region A1 has the largest amount of heating and is the region where the temperature rise is fast.
- the narrow area A1 becomes a quenching area
- the wide area A3 becomes a non-quenching area and becomes a warm forming area.
- the intermediate region A2 located between these is a transition region from the quenching region to the warm forming region. That is, the strength of the material 10 after hot pressing is narrow region A1> intermediate region A2> wide region A3, and has a strength distribution in the vehicle body width direction.
- the shape of the material 10 is made to correspond to the shape of the header extension 1 and is formed into a trapezoidal shape with a narrow inner width and a wider outer width.
- a temperature difference is generated in the heated material 10. Due to the temperature difference, during press molding of the material 10, a quenching region (narrow region A1) that is rapidly cooled from a predetermined temperature or higher, a warm forming region (wide region A3) that is molded in a high temperature state, and a space between them. And an intermediate region A2 located at (see FIG. 4). At the time of pressing, the strength of the material 10 is increased by quenching in the narrow area A1 that becomes the quenching area.
- the strength on the vehicle body inner side front header 2 side
- the strength on the vehicle body outer side is small
- a strength distribution along the vehicle body width direction is generated.
- an intermediate area A2 exists between the narrow area A1 and the wide area A3.
- the strength on the narrow region A1 side is large and the strength on the wide region A3 side is small, that is, the strength gradually decreases from the narrow region A1 toward the wide region A3.
- a car body was prepared.
- a load F is applied to the vehicle body in a direction in which a predetermined inclination angle is given to the outside end of the roof with respect to the vertical downward direction, and the magnitude of the load F is set.
- the roof strength evaluation to evaluate was performed. Specifically, as shown in FIG. 5B, the device was pushed in with the load F applied, and the correlation between the amount of movement S and the load F at that time was observed.
- the header extension 1 when the load F reaches a certain level, the header extension 1 is deformed from the low strength side (outside), and the increase in the load F is temporarily stopped. Is rising. Thus, the front header 2 is prevented from being bent by deforming the header extension 1 on the roof side inner 3 side first.
- the folding mode of the header extension 1 is a mode in which the header extension 1 is sequentially deformed from the outside toward the inside in accordance with the intensity distribution in the header extension 1. That is, the deformed portion can be guided to the side where the roof side inner 3 is coupled. In this way, it is possible to control the folding mode of the header extension 1 when the load F is applied to the roof.
- the wide area A3 includes a flange portion of the header extension 1, that is, a portion that requires a large amount of molding and requires accuracy.
- shaping according to the shape of the material 10 and the application of the header extension 1 is performed.
- the rigidity of the flange portion requiring a large cross-sectional area with respect to the extending direction of the header extension 1 can be ensured.
- the material 10 is formed in a shape in which the side of the header extension 1 that is coupled to the roof side inner 3 is wide.
- hot press molding is performed using a material 10 having a shape corresponding to the shape of the header extension 1.
- the narrow region A1 becomes a quenching region
- the wide region A3 becomes a non-quenching region
- the wide region A3 is made to correspond to the flange portion of the header extension 1 having a large development length.
- This is the optimum shape for the header extension 1.
- the material 10 is energized and heated, it is not necessary to adopt a special method for realizing a desired temperature distribution, and the equipment cost can be reduced.
- the material 10 does not need to be largely cut out when it is trimmed after the material 10 is pressed, the yield can be improved.
- the joining of the header extension 1, the front header 2, and the roof side inner 3 is performed by a simple operation such as general welding. Because it can be realized, productivity can be improved.
- the present invention can be used for a header extension that connects a front header and a roof side inner, and a vehicle body structure including a front header, a roof side inner, and a header extension that connects these.
Abstract
Description
図1及び図2に示すように、本実施形態の車体構造は、ヘッダエクステンション1と、このヘッダエクステンション1により連結されるフロントヘッダ2及びルーフサイドインナ3とを含んで構成される。
ヘッダエクステンション1は、車体前側の上部に配置されるフロントヘッダ2と、車体外側に配置されるルーフサイドインナ3とを連結する部材である。
図2に示すように、ヘッダエクステンション1は、ハット型断面を有し、その車体外側端部は、ルーフサイドインナ3と面で接合可能なようにフランジ状に形成されている。言い換えれば、ヘッダエクステンション1の車体外側端部には、ルーフサイドインナ3の側面と同一平面となるように接合用のフランジが形成されている。
このように形成されるヘッダエクステンション1は、車体内側端部及び外側端部においてフロントヘッダ2及びルーフサイドインナ3とそれぞれ接合されている。
ルーフサイドインナ3は、車体前後方向に設けられ、フロントヘッダ2の側方に配置される。ルーフサイドインナ3は、フロントウインドシールドガラスの側部を支持する。
具体的には、図3及び図4に示すように、平板状の素材10に一対の電極20・20を装着して、電極20・20間に通電することによって素材10を加熱する。所定温度に加熱された状態の素材10を金型に設置してプレスすることによって、急冷して焼き入れるとともに、金型の成形面に応じた形状に成形する。このようにして、素材10をホットプレス成形してヘッダエクステンション1の形状を得る。
図3に示すように、素材10は、車体外側の幅(前後幅)が内側の幅よりも大きい台形状に形成される平板である。上述のように、ヘッダエクステンション1の車体外側端部にフランジが形成されるため、ヘッダエクステンション1の形状に応じて、単純にハット型に成形される内側部分よりも外側の幅を大きくとっている。言い換えれば、ヘッダエクステンション1は、ルーフサイドインナ3に対して面で接合されることを考慮し、フランジ部分の剛性を確保するために素材10の外側の幅を大きく形成している。
素材10は、車体内側から外側に向かって、順に幅狭領域A1、中間領域A2、幅広領域A3の三つの領域に分けられる。幅狭領域A1は、車体内側に位置する略矩形状の領域である。幅広領域A3は、車体外側に位置し、ヘッダエクステンション1のフランジに対応する部分を含む略矩形状の領域である。中間領域A2は、幅狭領域A1と幅広領域A3の間の領域である。
このように、幅狭領域A1、中間領域A2、幅広領域A3を横断するように通電が行われる。このとき、幅狭領域A1は他の領域A2・A3に比べて、通電方向と直交する方向の断面積が小さくなるため、抵抗値が大きくなり、加熱量が多くなって温度が高くなる。同様に、幅広領域A3の加熱量は少なくなるため、温度が低くなる。
このように通電加熱された後の素材10をプレスする時に、幅狭領域A1は焼き入れ領域となる一方、幅広領域A3では非焼き入れ領域となり、温間成形領域となる。また、これらの間に位置する中間領域A2は、焼き入れ領域から温間成形領域への遷移領域となる。
すなわち、ホットプレス後の素材10の強度は、幅狭領域A1>中間領域A2>幅広領域A3となり、車体幅方向に強度分布を有する。
プレス時に、焼き入れ領域となる幅狭領域A1では、焼き入れにより素材10の強度が増大される。一方、非焼き入れ領域となる幅広領域A3では、素材10の強度には変化がない。このため、ヘッダエクステンション1では、車体内側(フロントヘッダ2側)の強度が大きく、車体外側(ルーフサイドインナ3側)の強度が小さくなり、車体幅方向に沿った強度分布が生じる。
また、幅狭領域A1と幅広領域A3の間に中間領域A2が存在している。中間領域A2においては、幅狭領域A1側の強度が大きく、かつ、幅広領域A3側の強度が小さくなる、つまり、幅狭領域A1から幅広領域A3に向かうに従って強度が徐々に小さくなる。
以上のように、フロントヘッダ2側が焼き入れ領域となり、かつ、ルーフサイドインナ3側が非焼き入れ領域となるヘッダエクステンション1と、ヘッダエクステンション1によって結合されるフロントヘッダ2及びルーフサイドインナ3とを含む車体を用意した。
この車体に対して、図5(a)に示すように、ルーフの外側端部に垂直下方に対して所定の傾斜角度を付けた方向に荷重Fを付加して、その荷重Fの大きさを評価するルーフ強度評価を行った。具体的には、図5(b)に示すように、荷重Fを付加した状態でデバイスを押し込んで、その移動量Sとそのときの荷重Fとの相関を見た。
このように、ルーフに荷重Fが付加された際のヘッダエクステンション1の折れモードをコントロールすることが可能である。
幅広領域A3は、ヘッダエクステンション1のフランジ部分、つまり成形量が大きく、かつ、精度が必要な箇所を含んでいる。このように、本実施形態では、素材10の形状及びヘッダエクステンション1の用途に応じた成形が行われる。特に、ヘッダエクステンション1の延出方向に対して大きな断面積を必要とするフランジ部分の剛性を大きく確保することができる。
本実施形態では、ヘッダエクステンション1の形状に応じた形状を有する素材10を用いて、ホットプレス成形している。これにより、通電加熱時に幅狭領域A1が焼き入れ領域となり、幅広領域A3が非焼き入れ領域となる、並びに、展開長の大きいヘッダエクステンション1のフランジ部分に幅広領域A3を対応させる等、素材10の形状がヘッダエクステンション1にとって最適な形状となっている。
このように、素材10を通電加熱する際に、所望の温度分布を実現するために特別な手法を採用する必要がなく、設備コストを低減できる。また、素材10をプレスした後、トリミング等をする際に大きく切り取る必要がなくなるため、歩留まりを向上できる。
2 フロントヘッダ
3 ルーフサイドインナ
10 素材
20 電極
Claims (3)
- フロントヘッダとルーフサイドインナを結合するヘッダエクステンションを成形する方法であって、
素材に通電し、その一部を焼き入れ温度以上に加熱する際に、前記フロントヘッダ側が前記焼入れ温度以上となり、前記ルーフサイドインナ側が前記焼き入れ温度未満となるように通電加熱し、
前記通電加熱後の素材をプレスして、前記ヘッダエクステンションの形状に成形し、急冷して焼き入れする、ヘッダエクステンションの成形方法。 - 前記ヘッダエクステンションは、フロントヘッダと結合される側からルーフサイドインナと結合される側に延出して設けられ、かつ、前記ルーフサイドインナと結合される側に、ルーフサイドインナと面接合可能なように当該ヘッダエクステンションの延出面と直交する面を有するフランジが形成され、
前記素材は、前記ヘッダエクステンションのフランジに対応するように、前記ルーフサイドインナ側の領域が他の領域に対して、前記ヘッダエクステンションの延出方向に直交する方向の幅が広い領域として形成され、かつ、前記フロントヘッダ側の領域が他の領域に対して、前記ヘッダエクステンションの延出方向に直交する方向の幅が狭い領域として形成され、
前記通電加熱は、前記ヘッダエクステンションの延出方向に沿って行われる請求項1に記載のヘッダエクステンションの成形方法。 - フロントヘッダと、ルーフサイドインナと、前記フロントヘッダと前記ルーフサイドインナを接合するヘッダエクステンションとを備える車体構造であって、
前記ヘッダエクステンションの前記フロントヘッダ側は焼き入れ領域であり、前記ルーフサイドインナ側は非焼き入れ領域である車体構造。
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PCT/JP2011/062116 WO2012160697A1 (ja) | 2011-05-26 | 2011-05-26 | ヘッダエクステンションの成形方法及び車体構造 |
JP2013516149A JP5835322B2 (ja) | 2011-05-26 | 2011-05-26 | ヘッダエクステンションの成形方法及びそれを用いた車体構造の製造方法、並びに、車体構造 |
EP11866340.0A EP2716525A4 (en) | 2011-05-26 | 2011-05-26 | METHOD FOR FORMING LENGTH EXTENSION AND VEHICLE STRUCTURE |
CN201180071151.0A CN103562053A (zh) | 2011-05-26 | 2011-05-26 | 顶梁延伸件的成形方法及车体结构 |
US14/122,008 US20140191539A1 (en) | 2011-05-26 | 2011-05-26 | Method of forming header extension, and vehicle structure |
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PCT/JP2011/062116 WO2012160697A1 (ja) | 2011-05-26 | 2011-05-26 | ヘッダエクステンションの成形方法及び車体構造 |
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Cited By (2)
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WO2015053035A1 (ja) * | 2013-10-09 | 2015-04-16 | 新日鐵住金株式会社 | 自動車車体用構造部材の製造方法及びプレス成形装置 |
WO2015053036A1 (ja) * | 2013-10-09 | 2015-04-16 | 新日鐵住金株式会社 | プレス成形体の製造方法及びプレス成形装置 |
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US10407101B2 (en) | 2014-12-22 | 2019-09-10 | Nippon Steel Corporation | Structural member |
CN108778549B (zh) * | 2016-05-09 | 2021-02-26 | 日本制铁株式会社 | 构造体及其制造方法 |
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EP3037187A1 (en) * | 2013-10-09 | 2016-06-29 | Nippon Steel & Sumitomo Metal Corporation | Production method for press-molded body, and press molding device |
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JP6032373B2 (ja) * | 2013-10-09 | 2016-11-30 | 新日鐵住金株式会社 | 自動車車体用構造部材の製造方法及びプレス成形装置 |
JP6032374B2 (ja) * | 2013-10-09 | 2016-11-30 | 新日鐵住金株式会社 | プレス成形体の製造方法及びプレス成形装置 |
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US10717123B2 (en) | 2013-10-09 | 2020-07-21 | Nippon Steel Corporation | Method and press-forming apparatus for manufacturing structural member for automotive body |
Also Published As
Publication number | Publication date |
---|---|
CN103562053A (zh) | 2014-02-05 |
US20140191539A1 (en) | 2014-07-10 |
EP2716525A1 (en) | 2014-04-09 |
JPWO2012160697A1 (ja) | 2014-07-31 |
EP2716525A4 (en) | 2015-10-14 |
JP5835322B2 (ja) | 2015-12-24 |
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