JPH10236248A - Bumper beam for automobile, and its manufacture - Google Patents
Bumper beam for automobile, and its manufactureInfo
- Publication number
- JPH10236248A JPH10236248A JP9243470A JP24347097A JPH10236248A JP H10236248 A JPH10236248 A JP H10236248A JP 9243470 A JP9243470 A JP 9243470A JP 24347097 A JP24347097 A JP 24347097A JP H10236248 A JPH10236248 A JP H10236248A
- Authority
- JP
- Japan
- Prior art keywords
- bending
- square pipe
- bumper beam
- compression
- automobile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Bending Of Plates, Rods, And Pipes (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自動車のバンパー
の後部に配置する角パイプを屈曲成形して形成された自
動車用バンパービームに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile bumper beam formed by bending a square pipe disposed at the rear of an automobile bumper.
【０００２】[0002]
【従来の技術】最近、自動車の衝突事故に対する車体強
化対策として、自動車前面に設置されるプラスチック製
のバンパーの後方に、ハイテンスチール材或いはアルミ
材等の金属材料により形成されたバンパービームを設け
ることが行われており、このバンパービームＡは、図２
１に示すように、自動車車体Ｂの前面に配置された合成
樹脂製等のバンパーＣの後部に配置され、フロントサイ
ドフレームＤに取り付けられて、自動車車体Ｂが衝突し
た際、衝撃力を車体Ｂのレインフォースであるフロント
サイドメンバーＤに確実に伝達させてるようにしたもの
で、バンパーＣが直接フロントサイドメンバーＤに衝接
しないように意図されたものである。このバンパービー
ムＡは、通常、断面矩形の角パイプを、車体Ｂの前面形
状に適合するように屈曲することによって成形して製作
していた。2. Description of the Related Art Recently, as a measure for strengthening a vehicle body in the event of an automobile collision, a bumper beam made of a metal material such as high-tensile steel or aluminum is provided behind a plastic bumper installed on the front of the vehicle. The bumper beam A is shown in FIG.
As shown in FIG. 1, it is disposed at the rear of a bumper C made of synthetic resin or the like disposed at the front of the vehicle body B, and is attached to the front side frame D. The bumper C is intended to prevent the bumper C from directly abutting on the front side member D. The bumper beam A is usually manufactured by bending a rectangular pipe having a rectangular cross section so as to conform to the front shape of the vehicle body B.
【０００３】そして、この角パイプの屈曲方法として
は、おおよそ、巻付け曲げ加工装置を用いて行う場合と
プレス機を用いて行う場合とがあった。[0003] As a method of bending the square pipe, there are roughly a method using a winding bending apparatus and a method using a press machine.
【０００４】巻付け曲げ加工装置（ベンダー）による場
合は、予め板材をロール成形機（巻付け曲げ加工装置に
組み込まれているのが多い）を用いて断面矩形の角パイ
プに成形していき、次の工程でこの角パイプを巻取ドラ
ムに巻き付けて、屈曲させていき、屈曲した角パイプの
接合端部同士を間隙おいて点溶接して屈曲角パイプを完
成させていくものである。In the case of a winding and bending apparatus (bender), a plate material is previously formed into a rectangular pipe having a rectangular cross section using a roll forming machine (often incorporated in the winding and bending apparatus). In the next step, the square pipe is wound around a winding drum and bent, and the bent square pipe is completed by performing spot welding with a gap between the joining ends of the bent square pipe.
【０００５】プレス機で行う場合、板材を予め断面矩形
に成形し、接合端部同士を全面に渡って溶着し形成され
た角パイプを用い、この角パイプの両端を下型に設置し
ておき、上型で角パイプの中央部をプレスすることによ
って屈曲させて、屈曲角パイプを完成していくものであ
る。[0005] In the case of using a press machine, a plate material is previously formed into a rectangular cross-section, and a joint pipe is welded over the entire surface to use a square pipe formed, and both ends of the square pipe are set in a lower mold. By pressing the central portion of the square pipe with the upper die, the pipe is bent to complete a bent square pipe.
【０００６】したがって、両装置により完成された屈曲
角パイプを比較した場合、角パイプの接合端部同士が全
長に渡って溶着されているプレス機によるものが剛性が
高く、ハイテンスチール材製バンパービームとしては好
ましく、また、巻付け加工装置の場合、角パイプ内に中
子をいれて成形していくのが通常であり、その分中子取
付取外工数等がかかることとなる。[0006] Therefore, when comparing the bent angle pipes completed by the two devices, the one using a press machine in which the joining ends of the square pipes are welded over the entire length has high rigidity, and a high-tensile steel bumper beam. In the case of a winding apparatus, it is normal to put a core in a square pipe and form the core, which requires a lot of man-hours for mounting and removing the core.
【０００７】[0007]
【発明が解決しようとする課題】そこで、プレス機によ
る場合を図２２に示す模式図を用いて金属材料製角パイ
プを屈曲していく場合を説明すると、予め形成した角パ
イプＥの両端を下型Ｆにより固定支持した後、上型Ｇに
より角パイプＥの中央に曲げ荷重を加えて、屈曲させて
いくものである。A case in which a metal material square pipe is bent using a press machine with reference to a schematic diagram shown in FIG. 22 will now be described. After fixedly supported by the mold F, a bending load is applied to the center of the square pipe E by the upper mold G to bend.
【０００８】従って、プレス機により角パイプＥを屈曲
させると、角パイプＥを構成する４側壁のうち互いに対
向する上下側壁の一方が圧縮側屈曲面となり、他方が引
張側屈曲面となる。[0008] Therefore, when the square pipe E is bent by the press machine, one of the upper and lower side walls facing each other among the four side walls constituting the square pipe E becomes a compression side bent surface, and the other becomes a tension side bent surface.
【０００９】そして、引張側屈曲面は、延ばされて亀裂
が生じる場合があり、圧縮側は圧縮されて皺が自然に発
生して、この皺が角パイプの角部より両横側壁にまで及
び、衝撃を加えた場合、この皺部分が曲げ線となって、
剛性を弱める結果となっていた。[0009] The tension-side bent surface may be elongated and cracked, and the compression side is compressed and wrinkles naturally occur. The wrinkles extend from the corners of the square pipe to both side walls. And, when an impact is applied, this wrinkle becomes a bending line,
The result was a reduction in rigidity.
【００１０】また、角パイプを屈曲させた場合、図２３
に示すような力（矢印参照）が発生して、中立軸Ｈを中
心に、上下側壁Ｉ側が、内側に引けてしまい、両横側壁
Ｊが外側に膨らんで、断面鼓形に形成されてしまい、角
パイプＥの強度に影響を及ぼしていた。When the square pipe is bent, FIG.
(See arrows), the upper and lower side walls I are pulled inward around the neutral axis H, and both side walls J bulge outward, forming a drum-shaped cross section. , Which affected the strength of the square pipe E.
【００１１】そこで、上記のような皺や亀裂の発生をな
るべく防止すべく、曲げ荷重を小さくすると、確かに特
に引張側屈曲面の亀裂を防止できるが、曲げ荷重を除去
した後、スプリングバックにより、所望の屈曲形状が得
られず、バンパービームとして、使用に供し得ないこと
となる。また、このスプリングバックを防止するため
に、塑性変形するまで屈曲させると、上記亀裂や皺の発
生が極端となり、延いては、角パイプ自体が折れてしま
うこととなる。Therefore, if the bending load is reduced to minimize the occurrence of wrinkles and cracks as described above, it is possible to prevent cracks, especially on the bending surface on the tension side. However, after the bending load is removed, spring back is performed. Therefore, a desired bent shape cannot be obtained, and it cannot be used as a bumper beam. In addition, when bending is performed until plastic deformation is performed in order to prevent the springback, the occurrence of the cracks and wrinkles becomes extreme, and the square pipe itself is broken.
【００１２】この点に鑑み、前記巻付け加工装置の例で
あるが、例えば、角パイプの引張側を蛇腹状に成形する
場合や、特開平７−６０３６４号公報或いは特開平７−
６０３６５号公報に記載されているように、巻き付けに
よる屈曲前に、予め角パイプの引張側及び圧縮側屈曲面
側に長手方向に凹溝を形成しておき、引張側屈曲面側の
凹溝を断面先開形とし、圧縮側屈曲面側の凹溝を先細り
形にして、皺や亀裂を抑制する方法が採られている。[0012] In view of this point, an example of the above-mentioned winding apparatus is, for example, a case in which the tension side of a square pipe is formed in a bellows shape, or disclosed in Japanese Patent Application Laid-Open No.
As described in Japanese Patent No. 60365, a groove is formed in the longitudinal direction in advance on the tension side and the compression side bending surface side of the square pipe before bending by winding, and the groove on the tension side bending surface side is formed. A method is adopted in which the cross-section is opened, and the concave groove on the compression-side bending surface side is tapered to suppress wrinkles and cracks.
【００１３】しかし、このような屈曲角パイプは、蛇腹
状部や凹溝の存在により屈曲しやすくなった分、その角
部における稜線が分断されて、一直線状にならないこと
があり、この状態で自動車のバンパービームとして使用
した場合、車両同士の衝突は完全なる正面衝突ばかりで
なく、いわゆるオフセット衝突が起こることを想定した
場合、蛇腹や凹溝の存在或いは稜線が潰れていることに
より、バンパービームの剛性を弱める結果となりかねな
い。[0013] However, such a bent-angle pipe is easily bent due to the presence of the bellows-like portion and the concave groove, and the ridge line at the corner portion may be cut off and may not be straight. When used as a bumper beam for an automobile, the collision between the vehicles is not only a complete head-on collision, but also when a so-called offset collision is assumed to occur, the presence of a bellows or a concave groove or the collapse of the ridge line causes the bumper beam to collide. May result in a reduction in the rigidity of the
【００１４】そこで、本発明は、上記従来の問題点に鑑
み、角パイプを屈曲成形させて製作されたバンパービー
ムの引張側屈曲面や圧縮側屈曲面側に予め凹溝や蛇腹の
加工を施さずに、角部稜線が一直線になるようにすると
ともに、皺や亀裂ひいては断面鼓形にならないように成
形された自動車用バンパービームおよびその製造方法を
提供することを目的としている。In view of the above-mentioned conventional problems, the present invention provides a bumper beam manufactured by bending a square pipe in such a manner that a concave groove or a bellows is previously formed on the tension-side bending surface or the compression-side bending surface side. Instead, it is an object of the present invention to provide a bumper beam for an automobile and a method of manufacturing the bumper beam, which is formed so that the corner ridge line is straight and does not have a wrinkle or a crack and thus does not have a cross-section drum shape.
【００１５】[0015]
【課題を解決するための手段】本発明によるバンパービ
ームは、上記従来の問題点を解決すべく、自動車のバン
パーの後部に配置する角パイプを屈曲成形して形成され
た自動車用バンパービームであって、角パイプの互いに
対向する２つの側面の一方が長手方向に凸湾曲面となる
引張側屈曲面に形成され、他方が長手方向に凹湾曲面と
なる圧縮側屈曲面に形成されるとともに、この圧縮側屈
曲面の中央部に複数個の塑性変形凹部を形成し、かつ全
側面が略平面に形成して構成している。SUMMARY OF THE INVENTION A bumper beam according to the present invention is an automobile bumper beam formed by bending and forming a square pipe disposed at the rear of an automobile bumper in order to solve the above-mentioned conventional problems. Thus, one of the two opposing side surfaces of the square pipe is formed on the tension-side bent surface that becomes a convex curved surface in the longitudinal direction, and the other is formed on the compression-side bent surface that becomes a concave curved surface in the longitudinal direction, A plurality of plastically deformed concave portions are formed at the center of the compression-side bent surface, and all side surfaces are formed substantially flat.
【００１６】この結果、本発明のバンパービームは、そ
の圧縮側屈曲面の中央部のみに塑性変形凹部が形成さ
れ、角部が描く稜線を分断されることなく一直線状に形
成されて、全側面は略平面形状となって、種々の角度か
らの衝撃に対して高剛性を発揮する。As a result, in the bumper beam of the present invention, a plastically deformed concave portion is formed only in the center portion of the compression-side bent surface, and the bumper beam is formed in a straight line without dividing the ridge line drawn by the corner portion. Has a substantially planar shape and exhibits high rigidity against impacts from various angles.
【００１７】また、本発明によるバンパービームは、前
記角パイプの互いに対向する２つの側面に連続する２つ
の横側面中央部に、前記圧縮側屈曲面側に底辺が位置し
かつ前記引張側屈曲面側に頂角が位置するような三角形
状の突起を長手方向に複数個形成するか、又は前記圧縮
側屈曲面側に長辺が位置し、且つ前記引張側屈曲面側に
短辺が位置するような台形状の突起を形成した結果、こ
の三角形状の突起も、角パイプの屈曲によって発生する
圧縮変形および引張り変形を吸収し、又突起が角部に存
在しないことから、角部が描く稜線が分断されず一直線
状になって、皺の発生を防止することになり、高剛性を
保持できることになる。Further, the bumper beam according to the present invention is characterized in that the square pipe has a base located on the compression-side bending surface side and a tension-side bending surface at a center portion of two lateral side surfaces continuing to two opposite side surfaces of the square pipe. A plurality of triangular protrusions are formed in the longitudinal direction such that the apex angle is located on the side, or the long side is located on the compression side bending surface side, and the short side is located on the tension side bending surface side As a result of forming such a trapezoidal projection, the triangular projection also absorbs the compressive and tensile deformations caused by the bending of the square pipe, and since the projection does not exist at the corner, the ridge line drawn by the corner is drawn. Are not divided and are linearly formed, thereby preventing the occurrence of wrinkles and maintaining high rigidity.
【００１８】また、上記のようなバンパービームの製造
方法は、角パイプを屈曲成形する上下型のうち、下型
が、前記屈曲成形前の角パイプの幅寸法と略同等の幅寸
法を有する凹湾曲成形面を有し、この凹湾曲成形面上で
前記角パイプの互いに対向する長手方向両横側面を抱持
する抱持側壁が立設されているとともに、前記凹湾曲成
形面の両端部に互いに水平上に位置するように前記角パ
イプの載置面を形成しており、また、上型が、前記下型
の抱持側壁の間寸法と略同等の幅寸法を有する凸湾曲成
形面を形成して、この凸湾曲成形面の中央部に長手方向
に向かって延在する複数個のパンチ突起を並設している
成形型を用いて、前記下型の凹湾曲成形面の載置面に、
前記屈曲成形前の角パイプ両端を載置セットし、次に、
前記上型を下降させて、この上型の凸湾曲成形面と下型
の凹湾曲成形面との間で、前記角パイプに曲げ荷重を加
えて屈曲成形するとともに、前記パンチ突起により角パ
イプの圧縮側屈曲面側の面の中央部に塑性変形凹部を形
成するようにしたことを特徴とするものである。Further, in the method of manufacturing a bumper beam as described above, in the upper and lower molds for bending and forming the square pipe, the lower mold has a recess having a width substantially equal to the width of the square pipe before the bending. Having a curved molding surface, holding side walls for holding the opposed longitudinal side surfaces of the square pipe on the concave curved molding surface are erected, and at both ends of the concave curved molding surface. The mounting surface of the square pipe is formed so as to be positioned horizontally above each other, and the upper mold has a convex curved molding surface having a width dimension substantially equal to the dimension between the holding side walls of the lower mold. Forming and using a mold in which a plurality of punch protrusions extending in the longitudinal direction are arranged side by side at the center of the convex curved molding surface, the mounting surface of the concave curved molding surface of the lower mold is used. To
Place and set both ends of the square pipe before the bending molding,
The upper mold is lowered, and between the convex curved forming surface of the upper mold and the concave curved forming surface of the lower mold, a bending load is applied to the square pipe so as to be bent, and the punch projection is used to form the square pipe. A plastically deformed concave portion is formed at the center of the surface on the compression-side bent surface side.
【００１９】さらに、本発明による自動車用バンパービ
ームの製造方法は、前記上型の凸湾曲成形面に接する対
向側壁に、前記上型の下降方向に延在する断面三角状の
凹部を複数条設け、該凹部により前記角パイプの屈曲成
形時に、該角パイプのの互いに対向する前記長手方向側
面に連続する２つの横側面中央部に、前記圧縮側屈曲面
側に底辺が位置しかつ前記引張側屈曲面側に頂角が位置
するような三角形状の突起を形成するか、又は前記圧縮
側屈曲面側に長辺が位置し且つ前記引張側屈曲面側に短
辺が位置するような台形状の突起を形成したことを特徴
とするものである。Further, in the method of manufacturing a bumper beam for an automobile according to the present invention, a plurality of recesses having a triangular cross section extending in a descending direction of the upper die are provided on the opposing side wall in contact with the convex curved forming surface of the upper die. When the square pipe is bent and formed by the concave portion, a bottom side is located at the compression side bent surface side at a center portion of two lateral side surfaces continuous with the longitudinal side surfaces of the square pipe facing each other, and the tension side is located. A trapezoidal shape in which a triangular protrusion is formed such that an apex angle is located on the bending surface side, or a long side is located on the compression side bending surface side and a short side is located on the tension side bending surface side Are formed.
【００２０】[0020]
【発明の実施の形態】以下、本発明の実施の形態を図面
を参照して詳述する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００２１】（実施の形態１）図１は、本発明の実施の
形態１を示すバンパービームの斜視図であり、そのバン
パービームは符号３１で示されており、成形前の角パイ
プ３と対比されている。(Embodiment 1) FIG. 1 is a perspective view of a bumper beam according to Embodiment 1 of the present invention. The bumper beam is indicated by reference numeral 31 and is compared with a square pipe 3 before molding. Have been.
【００２２】このバンパービーム３１は、図中上下長手
方向に位置する圧縮側屈曲面３１ａと引張側屈曲面３１
ｂとが互いに対向し、又これら圧縮側屈曲面３１ａ及び
引張側屈曲面３１ｂを、両横側面３１ｃが連続して、断
面略矩形を呈している。The bumper beam 31 has a compression side bending surface 31a and a tension side bending surface 31
b are opposed to each other, and the compression-side bending surface 31a and the tension-side bending surface 31b have a substantially rectangular cross section with both lateral side surfaces 31c continuing.
【００２３】そして、前記圧縮側屈曲面３１ａの中央部
長手方向には、複数個の塑性変形凹部７が形成されてお
り、この塑性変形凹部７は、図２及び図３に示すよう
に、圧縮側屈曲面３１ａの略中央部に存して、その角部
まで延在していない。このことから、バンパービーム３
１の角部が描く稜線は分断されることなく一直線状にな
っている。従って、圧縮側屈曲面３１ａは、引張側屈曲
面３１ｂや横側面３１ｃと共に、略平面形状に形成され
ていて、屈曲成形前の各パイプ３と略同等の形状を呈し
ている。A plurality of plastic deformation recesses 7 are formed in the longitudinal direction of the center of the compression-side bending surface 31a. As shown in FIG. 2 and FIG. It is located substantially at the center of the side bent surface 31a and does not extend to its corner. From this, bumper beam 3
The ridge line drawn by one corner is straight without being divided. Therefore, the compression-side bending surface 31a is formed in a substantially planar shape together with the tension-side bending surface 31b and the lateral side surface 31c, and has substantially the same shape as each pipe 3 before bending.
【００２４】次に、このように構成するバンパービーム
３１の製造方法について説明する。Next, a method of manufacturing the bumper beam 31 configured as described above will be described.
【００２５】即ち、図４は、上記本発明の実施の形態を
製作するための角パイプの屈曲成形金型装置の正面図で
あり、１は下型、２は上型で、これら上下型２、１によ
り成形金型を構成している。FIG. 4 is a front view of an apparatus for bending and forming a square pipe for manufacturing the above embodiment of the present invention, wherein 1 is a lower mold, 2 is an upper mold, and these upper and lower molds 2 are provided. 1 form a molding die.
【００２６】下型１は、屈曲成形前の角パイプ３の幅寸
法と略同等の幅寸法を有する凹湾曲成形面１ａを有し
（詳細は、図５参照）、この凹湾曲成形面１ａの互いに
対向する対向両側面１ｂ，１ｃに角パイプ３の対向側面
である横側面を抱持する抱持側壁４，５が立設されてい
る。また、凹湾曲成形面１ａの両端部には、互いに水平
面上に位置するように角パイプ３の載置面１ｄ，１ｅが
形成されている。The lower mold 1 has a concavely curved surface 1a having a width substantially equal to the width of the square pipe 3 before bending (see FIG. 5 for details). Holding side walls 4 and 5 for holding the side surfaces, which are the opposite side surfaces of the square pipe 3, are provided upright on the opposite side surfaces 1b and 1c facing each other. At both ends of the concave curved forming surface 1a, mounting surfaces 1d and 1e of the square pipe 3 are formed so as to be located on a horizontal plane.
【００２７】上型２は、下型１の抱持側壁４，５の間寸
法と略同等の幅寸法を有する凸湾曲成形面２ａが形成さ
れており、この凸湾曲成形面２ａの中央部に長手方向に
向かって、複数個のパンチ突起６、６…を並設されてい
る（詳細は図６参照）。The upper mold 2 is formed with a convex curved molding surface 2a having a width substantially equal to the dimension between the holding side walls 4 and 5 of the lower mold 1, and is formed at the center of the convex curved molding surface 2a. A plurality of punch protrusions 6, 6,... Are arranged side by side in the longitudinal direction (see FIG. 6 for details).
【００２８】このパンチ突起６、６…は、図７に更に詳
細に示すように、先端が凸角錐台形状に形成されてお
り、凸湾曲成形面２ａより上型２内に埋設されている。As shown in more detail in FIG. 7, the tips of the punch projections 6, 6,... Are formed in the shape of a truncated pyramid, and are embedded in the upper mold 2 from the convex curved molding surface 2a.
【００２９】次に、予め成形された角パイプ３を屈曲角
パイプに成形する場合について説明すると、まず、下型
１の凹湾曲成形面１ａの載置面１ｄ，１ｅに、角パイプ
３の両端を載置して、セットする。この時、角パイプ３
の対向側面である横側面は、抱持側壁４、５によって抱
持されている。Next, a case where the preformed square pipe 3 is formed into a bent square pipe will be described. First, both ends of the square pipe 3 are mounted on the mounting surfaces 1d and 1e of the concave curved forming surface 1a of the lower die 1. Place and set. At this time, square pipe 3
Are held by the holding side walls 4 and 5.
【００３０】この状態から、上型２を不図示のシリンダ
ー装置等で下降させていくと、角パイプ３の横側面は下
型１の抱持側壁４、５間で抱持されながら、上型２の凸
湾曲成形面２ａと下型１の凹湾曲成形面１ａとの間で，
角パイプ３に曲げ荷重を加えて屈曲成形され、図１に示
すようなバンパービーム３１を成形していく。From this state, when the upper mold 2 is lowered by a cylinder device or the like (not shown), the lateral side of the square pipe 3 is held between the holding side walls 4 and 5 of the lower mold 1 while the upper mold 2 is held. Between the convex curved molding surface 2a of the lower mold 1 and the concave curved molding surface 1a of the lower mold 1.
A bending load is applied to the square pipe 3 so as to bend and form a bumper beam 31 as shown in FIG.
【００３１】この時、上型２に設けたパンチ突起６，６
…により、角パイプ３の圧縮側屈曲面３１ａの面の中央
部に塑性変形凹部７が形成されることとなる。At this time, the punch projections 6, 6 provided on the upper die 2
..., a plastically deformed concave portion 7 is formed at the center of the compression-side bent surface 31a of the square pipe 3.
【００３２】この塑性変形凹部７は、バンパービーム３
１の圧縮側屈曲面３１ａの中央部のみに凹角錐台形状を
呈しており、図１に示すように、圧縮側屈曲面３１ａ横
側面３１ｃの幅寸法より長くなって形成されているが、
圧縮側屈曲面３１ａの幅方向の寸法は、横側面３１ｃの
幅寸法より短い場合、或いは幅方向と横側面３１ｃのと
が略同じ場合も考えられる。This plastically deformed concave portion 7
1 has a truncated pyramid shape only at the center of the compression-side bending surface 31a, and as shown in FIG. 1, is formed to be longer than the width dimension of the compression-side bending surface 31a and the side surface 31c.
The width dimension of the compression-side bent surface 31a may be shorter than the width dimension of the lateral side surface 31c, or the width direction and the lateral side surface 31c may be substantially the same.
【００３３】上記のように成形されたバンパービーム３
１は、屈曲成形過程において、互いに対向する横側面３
１ｃが、下型１の抱持側壁４、５によって抱持され、
又、圧縮側屈曲面３１ａ及び引張側屈曲面３１ｂは、凹
凸両湾曲成形面１ａ，２ａに抱持されて、結果として、
図２に示すごとく、両横側壁が外側に膨らまず、圧縮側
屈曲面３１ａ上に、遡性変形凹部７を、形成することに
より、この面の皺の発生原因となる余肉を吸収してしま
うので、略平面を確保できる。一方、張側屈曲面３１ｂ
にあっては、中立軸がこの面に近接してくるので、無理
な引張りが抑制されて、平面が確保できることから、従
来のような断面鼓形状にならず、四囲の面が平面に形成
されており、バンパービーム３１の強度を高めることと
なる。The bumper beam 3 formed as described above
1 is a side surface 3 facing each other in the bending process.
1c is held by the holding side walls 4, 5 of the lower mold 1,
Further, the compression-side bending surface 31a and the tension-side bending surface 31b are held by the concave and convex curved forming surfaces 1a and 2a, and as a result,
As shown in FIG. 2, the two side walls do not bulge outward, and the retroactively deformed concave portion 7 is formed on the compression-side bent surface 31 a to absorb the excess thickness that causes wrinkles on this surface. Therefore, a substantially flat surface can be secured. On the other hand, the tension side bent surface 31b
In this case, since the neutral axis comes close to this surface, excessive pulling is suppressed, and a flat surface can be secured. Therefore, the intensity of the bumper beam 31 is increased.
【００３４】さらに、凸湾曲成形面２ａのパンチ突起
６，６…は、バンパービーム３１の圧縮側屈曲面３１ａ
にパンチ突起６、６…の数だけの塑性変形凹部７が形成
されることとなるが、この塑性変形凹部７は、バンパー
ビーム３１の角部が描く稜線を分断することなく一直線
状になって、曲げ応力による圧縮側屈曲面３１ａ側の皺
の発生を防止することとなり、また、塑性変形故に、バ
ンパービーム３１のスプリングバックを生じさせないこ
ととなって、所望の形状のバンパービーム３１を成形す
ることとなる。Further, the punch projections 6, 6,... Of the convex curved molding surface 2a are formed on the compression side bending surface 31a of the bumper beam 31.
Are formed as many as the number of the punch protrusions 6, 6,..., But the plastic deformation recesses 7 are straightened without dividing the ridges drawn by the corners of the bumper beam 31. In addition, it is possible to prevent wrinkles on the compression-side bending surface 31a side due to bending stress, and to prevent the spring back of the bumper beam 31 due to plastic deformation, thereby forming the bumper beam 31 having a desired shape. It will be.
【００３５】また、パンチ突起６、６…は、凸湾曲成形
面２ａ側の面の中央部に配置して、縁部に至っていない
結果、バンパービーム３１の圧縮側屈曲面３１ａの中央
部のみ塑性変形凹部７が形成され、バンパービーム３１
の角部が描く稜線を分断することなく一直線状となり、
バンパービーム３１の圧縮側及び引張側両屈曲面３１
ａ、３１ｂと横側面３１ｃとは略平面となってつなが
り、バンパービーム３１を自動車のバンパービームとし
て使用した場合等、従来の屈曲角パイプのような皺や凹
溝が存在するとともに角部が描く稜線が一直線となって
いない場合に比して、車両のオフセット衝突に対して
も、剛性を非常に高めることとなる。The punch projections 6, 6,... Are arranged at the center of the surface on the side of the convexly curved forming surface 2a, and do not reach the edge. As a result, only the center of the compression-side bending surface 31a of the bumper beam 31 is plastically formed. The deformation recess 7 is formed, and the bumper beam 31 is formed.
It becomes a straight line without dividing the ridge line drawn by the corner,
Bending surface 31 on both compression side and tension side of bumper beam 31
The a and 31b and the lateral side surface 31c are connected to be substantially flat, and when the bumper beam 31 is used as a bumper beam of an automobile, a wrinkle or a groove like a conventional bent-angle pipe exists and a corner is drawn. As compared with the case where the ridge line is not straight, the rigidity is greatly increased even with respect to the offset collision of the vehicle.
【００３６】（実施の形態２）図８は、前記実施の形態
１に対して、上下に位置する圧縮側屈曲面３１ａと引張
側屈曲面３１ｂとが互いに対向し、又これら圧縮側屈曲
面３１ａ及び引張側屈曲面３１ｂを、両横側面３１ｃが
連続して、断面略矩形を呈しており、また、圧縮側屈曲
面３１ａの中央部長手方向には、複数個の塑性変形凹部
７が形成されており、この塑性変形凹部７は、圧縮側屈
曲面３１ａの略中央部に存して、その縁部まで延在して
おらず（図９および図１０を参照）、従って、圧縮側屈
曲面３１ａは、引張側屈曲面３１ｂや横側面３１ｃと共
に、略平面形状に形成されていて、屈曲成形前の各パイ
プ３と略同等の断面形状を呈している点は同じである
が、両横側面３１ｃに、前記塑性変形凹部７にそれぞれ
対向するように、三角形状の突起８が複数個形成されて
いる点を異にしている。(Embodiment 2) FIG. 8 is different from Embodiment 1 in that a compression-side bending surface 31a and a tension-side bending surface 31b positioned above and below face each other, and the compression-side bending surface 31a The tension-side bending surface 31b has both lateral side surfaces 31c continuous and has a substantially rectangular cross section, and a plurality of plastic deformation recesses 7 are formed in the longitudinal direction of the center of the compression-side bending surface 31a. The plastically deformed concave portion 7 is located substantially at the center of the compression-side bent surface 31a and does not extend to the edge thereof (see FIGS. 9 and 10). 31a is formed in a substantially planar shape together with the tension-side bending surface 31b and the lateral side surface 31c, and has the same cross-sectional shape as each pipe 3 before bending forming. 31c so as to face the plastic deformation recess 7 respectively. Projection 8 of the shape is different in that it is plural number.
【００３７】この三角形状の突起８は、その底辺側が圧
縮側屈曲面３１ａ側に位置し、頂角側が引張側屈曲面３
１ｂ側に位置するように形成されていて、角パイプ３の
屈曲によって発生する圧縮変形を吸収して、皺の発生を
防止することになり、また三角形状の突起が角部に存在
しないことから、該角部が描く稜線が分断されず一直線
状になって、車両同士の正面衝突ばかりでなく、いわゆ
るオフセット衝突に対しても、高剛性を保持できること
になる。The triangular projection 8 has a bottom side located on the compression side bent surface 31a side and an apex side located on the tension side bent surface 3a.
1b side, it absorbs the compressive deformation caused by the bending of the square pipe 3 to prevent the generation of wrinkles, and since the triangular projection does not exist at the corner, The ridges drawn by the corners are not divided and are straight, so that high rigidity can be maintained not only in frontal collision between vehicles but also in so-called offset collision.
【００３８】そして、三角形状の突起６も、角パイプ３
の屈曲によって発生する圧縮変形および引張り変形を吸
収し、又、突起６が角部には存在しないことから、角部
が描く稜線を一直線状に保持したまま製作することがで
き、小型自動車のバンパービームのように屈曲率の高い
バンパービームに適用したとしても、皺の発生を抑えて
剛性の高いものを得ることができ、低コスト或いは軽量
の金属材料をも使用できて、バンパービームの設計自由
度を確保することができる。The triangular projection 6 is also used for the square pipe 3.
Absorbs the compressive deformation and the tensile deformation caused by the bending of the bumper, and since the projection 6 is not present at the corner, the bump can be manufactured while keeping the ridge drawn by the corner straight. Even if it is applied to a bumper beam having a high bending rate like a beam, it is possible to obtain a highly rigid one by suppressing the generation of wrinkles, and it is possible to use a low-cost or lightweight metal material, and to design a bumper beam freely. Degree can be secured.
【００３９】次に、このように構成するバンパービーム
３１の製造方法について説明する。Next, a method of manufacturing the bumper beam 31 configured as described above will be described.
【００４０】即ち、図１１および図１２に示すように、
実施の形態２のバンパービーム３１を製作する成形金型
としは、下型１の抱持側壁４、５に、その外側先端より
凹湾曲成形面１ａ側に向かって延在する断面三角形状の
凹溝部１ｆが複数条形成されている点が異なるも、その
他の構成は同じである。That is, as shown in FIGS. 11 and 12,
The molding die for producing the bumper beam 31 of the second embodiment includes a concave triangular cross-section extending from the outer tip to the concave curved molding surface 1 a side on the holding side walls 4 and 5 of the lower die 1. Although the difference is that a plurality of grooves 1f are formed, other configurations are the same.
【００４１】次に、予め成形された角パイプ３を屈曲角
パイプに成形する場合について説明すると、図１３に示
すように、まず、下型１の凹湾曲成形面１ａの載置面１
ｄ，１ｅに、角パイプ３の両端を載置してセットする。
この時、角パイプ３の横側面は、抱持側壁４、５によっ
て抱持されている。Next, a case where the preformed square pipe 3 is formed into a bent square pipe will be described. First, as shown in FIG.
The two ends of the square pipe 3 are placed and set on d and 1e.
At this time, the side surface of the square pipe 3 is held by the holding side walls 4 and 5.
【００４２】この状態から、上型２を不図示のシリンダ
ー装置等で下降させていくと、角パイプ３の横側面は下
型１の抱持側壁４、５間で抱持されながら、上型２の凸
湾曲成形面２ａと下型１の凹湾曲成形面１ａとの間で，
角パイプ３に曲げ荷重を加えて屈曲成形して、図８に示
すようなバンパービーム３１を成形していく。From this state, when the upper mold 2 is lowered by a cylinder device or the like (not shown), the lateral side of the square pipe 3 is held between the holding side walls 4 and 5 of the lower mold 1 while the upper mold 2 is held. Between the convex curved molding surface 2a of the lower mold 1 and the concave curved molding surface 1a of the lower mold 1.
A bending load is applied to the square pipe 3 to bend and form the bumper beam 31 as shown in FIG.
【００４３】この時、上型２に設けたパンチ突起６，６
…により、角パイプ３の圧縮側屈曲面側の面の中央部に
塑性変形凹部７が形成されることとなる。At this time, the punch projections 6 and 6 provided on the upper die 2
..., a plastically deformed concave portion 7 is formed at the center of the compression-side bent surface side of the square pipe 3.
【００４４】この塑性変形凹部７は、バンパービーム３
１の圧縮側屈曲面３１ａの中央部のみに凹角錐台形状を
呈しており、図８に示すように、圧縮側屈曲面３１ａ
は、幅方向の寸法が、横側面３１ｃの幅寸法より長くな
って形成されているが、圧縮側屈曲面３１ａの幅方向の
寸法は、横側面３１ｃの幅寸法より短い場合、或いは略
同じ場合も考えられる。This plastically deformed concave portion 7
1 has a truncated pyramid shape only at the center of the compression-side bent surface 31a, and as shown in FIG.
Is formed such that the dimension in the width direction is longer than the width dimension of the lateral side surface 31c, but the dimension in the width direction of the compression-side bent surface 31a is shorter than the width dimension of the lateral side surface 31c or approximately the same. Is also conceivable.
【００４５】また、下型１の抱持側壁４、５に設けた凹
溝部１ｆによって、図１５に示すように、角パイプ３
を、下型１の載置面１ｄ、１ｅに載置した状態では、下
型１の抱持側壁４、５と角パイプ３の横側面３ｃとの間
の一部に隙間Ｓが形成され、図１６に示すように、上型
２により角パイプ３を屈曲成形した際に、横側面３ｃが
隙間Ｓに導かれて膨らみ、凹溝部１ｆが三角形状を呈し
ているために、出来上がったバンパービーム３１の横側
面３１ｃに、三角形状の突起８が形成されることとな
る。そして、凹溝部１ｆは、下型１の凹湾曲成形面１ａ
側の先端が、先鋭となっているために、バンパービーム
３１の横側面３１ｃに形成された突起８は、底辺側が圧
縮側屈曲面３１ａ側に位置し、頂角側が引張側屈曲面３
１ｂ側に位置する三角形状を呈することになる。Further, as shown in FIG. 15, the square pipe 3 is formed by the concave grooves 1f provided in the holding side walls 4, 5 of the lower mold 1.
Is placed on the placement surfaces 1 d and 1 e of the lower die 1, a gap S is formed in a part between the holding side walls 4 and 5 of the lower die 1 and the lateral side surface 3 c of the square pipe 3, As shown in FIG. 16, when the square pipe 3 is bent and formed by the upper die 2, the side surface 3c is guided by the gap S and swells, and the concave groove portion 1f has a triangular shape. A triangular projection 8 is formed on the lateral side surface 31c of the base 31. The concave groove portion 1f is formed on the concave curved forming surface 1a of the lower mold 1.
The projection 8 formed on the lateral side surface 31c of the bumper beam 31 is located on the compression side bending surface 31a side, and the apex side is on the tension side bending surface 3 because the front end is sharpened.
It will have a triangular shape located on the 1b side.
【００４６】上記のように形成されたバンパービーム３
１は、屈曲成形過程において横側面３１ｃへ圧縮により
発生してくる余肉を凹溝部１ｆへ押し込む事になり、１
ｆ以外の横側面３１ｃは抱持壁４、５によって抱持され
ているので平面を保つことができる。又、圧縮側屈曲面
３１ａに発生する余肉は塑性変形凹部７がこれを吸収す
ることになるので、この面は略平面を確保できる。又、
一方、引張側屈曲面３１ｂは中立軸が引張側へ移動する
ので無理な伸びが抑制され、凹成形面１ａに加圧されて
いるので平面を確保できる。このために従来のように断
面が鼓形状にならず、角部が描く稜線が分断されること
なく一直線状を保持するとともに、四囲の面が平面に形
成されており、バンパービーム３１の強度を高めること
となる。The bumper beam 3 formed as described above
1 is to push the surplus generated by compression into the lateral side surface 31c in the bending process, into the concave groove portion 1f.
Since the lateral side surfaces 31c other than f are held by the holding walls 4, 5, they can be kept flat. In addition, since the plastic deformation concave portion 7 absorbs the excess thickness generated on the compression-side bending surface 31a, this surface can secure a substantially flat surface. or,
On the other hand, since the neutral axis moves to the tension side, excessive elongation of the tension-side bending surface 31b is suppressed, and a flat surface can be secured because the concave-shaped surface 1a is pressed. For this reason, the cross section does not have a drum shape as in the related art, the ridge line drawn by the corner is kept straight without being divided, and the surrounding surface is formed in a plane, and the strength of the bumper beam 31 is reduced. Will increase.
【００４７】さらに、凸湾曲成形面２ａのパンチ突起
６，６…は、バンパービーム３１の圧縮側屈曲面３１ａ
にその数だけの塑性変形凹部７が形成されることになる
が、この塑性変形凹部７は、曲げ応力による圧縮側屈曲
面３１ａ側の皺の発生を防止することとなり、また、塑
性変形故に、バンパービーム３１のスプリングバックを
生じさせないこととなって、所望の形状のバンパービー
ム３１を成形することとなる。Further, the punch projections 6, 6,... Of the convex curved forming surface 2a are formed on the compression side bending surface 31a of the bumper beam 31.
The number of the plastically deformed concave portions 7 is formed at the same time. However, the plastically deformed concave portions 7 prevent the generation of wrinkles on the compression-side bending surface 31a side due to bending stress, and because of plastic deformation, Since the springback of the bumper beam 31 does not occur, the bumper beam 31 having a desired shape is formed.
【００４８】また、パンチ突起６、６…は、凸湾曲成形
面２ａ側の面の中央部に配置して、縁部に至っていない
結果、バンパービーム３１の圧縮側屈曲面３１ａの中央
部のみ塑性変形凹部７が形成され、バンパービーム３１
の圧縮側及び引張側両屈曲面３１ａ、３１ｂと横側面３
１ｃとは平面となってつながり、角部が描く稜線を一直
線状となし、バンパービーム３１を自動車のバンパービ
ームとして使用した場合等、従来の屈曲角パイプのよう
な皺や凹溝が存在するとともに角部が描く稜線が一直線
となっていない場合に比して、車両のオフセット衝突に
対しても、剛性を非常に高めることとなる。The punch projections 6, 6,... Are arranged at the center of the surface on the side of the convexly curved forming surface 2a and do not reach the edge, so that only the center of the compression-side bending surface 31a of the bumper beam 31 is plastically formed. The deformation recess 7 is formed, and the bumper beam 31 is formed.
Compression side and tension side bending surface 31a, 31b and side surface 3
When the bumper beam 31 is used as a bumper beam of an automobile, there are wrinkles and grooves like a conventional bent-angle pipe, when the ridge line drawn by the corner is made straight and connected with a flat surface with 1c. As compared with the case where the ridge line drawn by the corner is not straight, the rigidity is greatly increased even with the offset collision of the vehicle.
【００４９】図１７乃至図１９は、前記実施の形態２に
よるバンパービーム３１の変形例を示したものである。
即ち、前記実施の形態２によるバンパービーム３１は、
断面が「口」字状を呈しているが、図１７に示すバンパ
ービーム３１は、圧縮側屈曲面３１ａと引張側屈曲面３
１ｂとの間に１つの突っ張り片９を一体に挿着して、断
面「日」字状にしたものであり、図１８に示すバンパー
ビーム３１は、圧縮側屈曲面３１ａと引張側屈曲面３１
ｂとの間に互いに対向する２つの突っ張り片１０、１１
を一体に挿着して、断面「目」字状にしたものであり、
図１９に示すバンパービーム３１は、圧縮側屈曲面３１
ａと引張側屈曲面３１ｂとの間及び両横側面３１ｅに十
文字の突っ張り片１２を一体に挿着して、断面「田」字
状にしたものである。FIGS. 17 to 19 show modifications of the bumper beam 31 according to the second embodiment.
That is, the bumper beam 31 according to the second embodiment is
Although the cross section has a “mouth” shape, the bumper beam 31 shown in FIG. 17 has a compression-side bending surface 31 a and a tension-side bending surface 3.
1b, a single stretch piece 9 is integrally inserted and formed into a “Japanese” cross section. A bumper beam 31 shown in FIG. 18 has a compression-side bending surface 31a and a tension-side bending surface 31.
b, two strut pieces 10, 11 facing each other
Are inserted together to form an "eye" cross section.
The bumper beam 31 shown in FIG.
A cross-shaped strut piece 12 is integrally inserted between a and the tension-side bent surface 31b and on both lateral side surfaces 31e to form a cross-section of a "ta" shape.
【００５０】（実施の形態３）図２０は、本発明による
実施の形態３を示しており、図２０に示すバンパービー
ム３１は、それぞれの角部の長手方向に延びる厚肉部１
２を形成したもので、それぞれ、前記実施の形態２にお
けるバンパービーム３１より、高剛性にすべく意図した
ものである。従って、この変形例は、前記実施の形態１
の場合にも適用できること明らかである。更に、図２０
において、両横側面３１ｃには、三角形状の突起８に代
えて、台形状の突起９を形成される点相違している。こ
の台形状の突起９は、その長辺側が圧縮側屈曲面３１ａ
側に位置し、短辺側が引張側屈曲面３１ｂ側に位置する
ように形成してある。従って、この台形状の突起９も、
前記実施の形態１および２の場合にも適用可能である。(Embodiment 3) FIG. 20 shows Embodiment 3 according to the present invention. The bumper beam 31 shown in FIG. 20 has a thick portion 1 extending in the longitudinal direction of each corner.
2 are intended to have higher rigidity than the bumper beam 31 in the second embodiment. Therefore, this modified example is different from the first embodiment.
It is clear that the present invention can be applied to the case. Further, FIG.
In this embodiment, trapezoidal projections 9 are formed on both lateral side surfaces 31c instead of the triangular projections 8. The long side of the trapezoidal projection 9 has a compression-side bent surface 31a.
Side, and the short side is formed so as to be located on the tension side bent surface 31b side. Therefore, this trapezoidal projection 9 also
The present invention is also applicable to the first and second embodiments.
【００５１】[0051]
【発明の効果】本発明は、自動車のバンパーの後部に配
置する角パイプを屈曲成形して形成された自動車用バン
パービームであって、角パイプの互いに対向する２つの
側面の一方が長手方向に凸湾曲面となる引張側屈曲面に
形成され、他方が長手方向に凹湾曲面となる圧縮側屈曲
面に形成されるとともに、この圧縮側屈曲面の中央部に
複数個の塑性変形凹部を形成することから、角部が描く
稜線を分断することなく一直線状に形成して、全側面が
略平面となり、又、屈曲成形過程において、互いに対向
する横側面が、下型の抱持側壁によって抱持され、圧縮
側屈曲面及び引張側屈曲面は、凹凸両湾曲成形面に抱持
されて、結果として、両横側壁が外側に膨らまず、圧縮
側屈曲面及び引張側屈曲面が内側に引けてしまわないこ
とから、従来のような断面鼓形状にならず、四囲の面が
平面に形成されており、バンパービーム３１の強度を高
めることとなる。According to the present invention, there is provided an automobile bumper beam formed by bending and forming a square pipe disposed at a rear portion of an automobile bumper, wherein one of two opposing side surfaces of the square pipe extends in a longitudinal direction. It is formed on the tension side bending surface which becomes a convex curved surface, and the other is formed on the compression side bending surface which becomes a concave curved surface in the longitudinal direction, and a plurality of plastically deformed concave portions are formed in the center of this compression side bending surface. Therefore, the ridge lines drawn by the corners are formed in a straight line without being divided, and all the side surfaces are substantially flat. Also, in the bending process, the side surfaces facing each other are held by the holding wall of the lower mold. The compression-side bending surface and the tension-side bending surface are held by the concave and convex curved surfaces, and as a result, both lateral side walls do not expand outward, and the compression-side bending surface and the tension-side bending surface retract inward. Because it does n’t Such not to cross hourglass shape, surfaces of four sides are formed in a plane, and to increase the strength of the bumper beam 31.
【００５２】さらに、バンパービームは、その圧縮側屈
曲面に塑性変形凹部が形成されていることから、この塑
性変形凹部は、曲げ応力による圧縮側屈曲面側の自然発
生的な皺の発生を拡大するのを防止することとなり、側
面への皺の伝播を阻止する。また、塑性変形故に、バン
パービームのスプリングバックを生じさせないこととな
って、所望の形状のバンパービームを成形されているこ
ととなる。Further, since the bumper beam has a plastically deformed concave portion formed on the compression side bent surface, the plastically deformed concave portion enlarges the naturally occurring wrinkles on the compression side bent surface side due to bending stress. This prevents the propagation of wrinkles to the side surfaces. Also, due to plastic deformation, springback of the bumper beam is not caused, and a bumper beam having a desired shape is formed.
【００５３】また、バンパービームの圧縮側屈曲面の中
央部のみ塑性変形凹部が形成されている結果、バンパー
ビームの圧縮側及び引張側両屈曲面と横側面とは平面と
なり、バンパービームは、従来のバンパービームのよう
に自然発生的皺或いは凹溝や蛇腹が存在する場合に比し
て、車両のオフセット衝突に対しても、剛性を非常に高
めることができ、その圧縮側屈曲面の中央部のみに塑性
変形凹部が形成されて、全側面は略平面形状となって、
種々の角度からの衝撃に対して高剛性を発揮する。Further, since the plastically deformed concave portion is formed only at the center of the compression-side bending surface of the bumper beam, both the compression-side and tension-side bending surfaces and the side surface of the bumper beam are flat, and the bumper beam is of the conventional type. Compared to the case where naturally occurring wrinkles, concave grooves or bellows are present as in the case of a bumper beam, the rigidity can be greatly increased even with an offset collision of the vehicle, and the central part of the compression side bending surface Only plastic deformation recesses are formed, all sides are substantially planar,
Exhibits high rigidity against impacts from various angles.
【００５４】さらに、本発明によるバンパービームは、
圧縮側屈曲面に塑性変形凹部を形成するとともに、両横
側面中央部に、圧縮側屈曲面側に底辺が位置し、かつ引
張側屈曲面側に頂角が位置するような三角形状の突起を
長手方向に複数個遡状変形にて形成した結果、この三角
形状の突起も、角パイプの屈曲によって発生する圧縮変
形を吸収する。また三角形状の突起が角部に存在せず、
角部が描く稜線が分断されず一直線状になっているため
に、小型自動車のバンパービームのように屈曲率の高い
バンパービームに適用したとしても、皺の発生を抑えて
剛性の高いものを得ることができ、バンパービームの設
計自由度を確保するとともに、低コストの金属材料を使
用することができる。Further, the bumper beam according to the present invention
Along with forming a plastically deformed concave portion on the compression-side bent surface, a triangular protrusion having a base located on the compression-side bent surface side and an apex angle located on the tension-side bent surface side is provided at the center of both lateral side surfaces. As a result of being formed by a plurality of backward deformations in the longitudinal direction, the triangular projections also absorb the compressive deformation caused by the bending of the square pipe. Also, there are no triangular protrusions at the corners,
Since the ridges drawn by the corners are straight and not divided, even when applied to a bumper beam with a high bending rate, such as a bumper beam for a small car, a highly rigid one can be obtained by suppressing wrinkles. Therefore, the degree of freedom in designing the bumper beam can be secured, and a low-cost metal material can be used.
【図１】本発明の実施の形態１におけるバンパービーム
の斜視図である。FIG. 1 is a perspective view of a bumper beam according to Embodiment 1 of the present invention.
【図２】図１のＸ１−Ｘ１断面図である。2 is a X 1 -X 1 cross-sectional view of FIG.
【図３】図１のＹ１−Ｙ１断面図である。3 is a Y 1 -Y 1 cross-sectional view of FIG.
【図４】本発明の実施の形態１におけるバンパービーム
を製造するための角パイプの屈曲成形金型の正面図であ
る。FIG. 4 is a front view of a bent mold for a square pipe for manufacturing a bumper beam according to the first embodiment of the present invention.
【図５】図４における下型の斜視図である。FIG. 5 is a perspective view of a lower mold in FIG. 4;
【図６】図４における上型の斜視図である。FIG. 6 is a perspective view of the upper die in FIG.
【図７】図６の一部を拡大して示す上型の斜視図であ
る。FIG. 7 is a perspective view of an upper mold showing a part of FIG. 6 in an enlarged manner.
【図８】本発明の実施の形態２におけるバンパービーム
の斜視図である。FIG. 8 is a perspective view of a bumper beam according to Embodiment 2 of the present invention.
【図９】図８のＸ２−Ｘ２断面図である。9 is a X 2 -X 2 cross-sectional view of FIG.
【図１０】図８のＹ２−Ｙ２断面図である。It is a Y 2 -Y 2 cross-sectional view of FIG. 10 FIG.
【図１１】本発明の実施の形態２におけるバンパービー
ムを製造するための角パイプの屈曲成形金型のうち、上
型の正面図である。FIG. 11 is a front view of an upper mold of a bending mold for a square pipe for manufacturing a bumper beam according to the second embodiment of the present invention.
【図１２】同じく、下型の正面図である。FIG. 12 is a front view of the lower die.
【図１３】本発明の実施の形態２におけるバンパービー
ムを製造するための角パイプの屈曲成形金型における角
パイプを載置した型開き状態を示す一部を断面にして示
す正面図である。FIG. 13 is a front view showing, in section, a part of a bent state of a square pipe for manufacturing a bumper beam according to Embodiment 2 of the present invention, in which a square pipe is placed and a mold is opened.
【図１４】同じく型締め状態を示す正面図である。FIG. 14 is a front view showing a mold clamping state.
【図１５】図１３における要部断面図である。FIG. 15 is a sectional view of a main part in FIG.
【図１６】図１４における要部断面図である。FIG. 16 is a sectional view of a main part in FIG.
【図１７】本発明による実施の形態２の一の変形例を示
す一部破断した斜視図である。FIG. 17 is a partially broken perspective view showing a modification of the second embodiment according to the present invention.
【図１８】本発明による実施の形態２の他の変形例を示
す一部破断した斜視図である。FIG. 18 is a partially broken perspective view showing another modification of the second embodiment according to the present invention.
【図１９】本発明による実施の形態２の他の変形例を示
す一部破断した斜視図である。FIG. 19 is a partially broken perspective view showing another modification of the second embodiment according to the present invention.
【図２０】本発明による実施の形態２の他の変形例を示
す一部破断した斜視図である。FIG. 20 is a partially broken perspective view showing another modification of the second embodiment according to the present invention.
【図２１】自動車の車体前部の一部を破断して示す側面
図である。FIG. 21 is a side view showing a part of a front portion of a vehicle body of an automobile in a cutaway manner.
【図２２】従来のプレス機でバンパービームを製作する
説明図である。FIG. 22 is an explanatory view for producing a bumper beam by a conventional press machine.
【図２３】図２２によるプレス機で製造されたバンパー
ビームの側面図である。FIG. 23 is a side view of a bumper beam manufactured by the press according to FIG. 22;
７ 塑性変形凹部 ８ 三角形状の突起 ９ 台形状の突起 ３１ バンパービーム ３１ａ 圧縮側屈曲面 ３１ｂ 引張側屈曲面 ３１ｃ 横側面 7 Plastic deformation recess 8 Triangular protrusion 9 Trapezoidal protrusion 31 Bumper beam 31a Compression side bending surface 31b Tensile side bending surface 31c Lateral side surface
フロントページの続き (72)発明者 山下 年丸 静岡県富士市五味島19−１ 山川工業株式 会社内Continued on the front page (72) Inventor Toshimaru Yamashita 19-1 Gomijima, Fuji City, Shizuoka Prefecture Yamakawa Industry Co., Ltd.
Claims (6)
イプを屈曲成形して形成された自動車用バンパービーム
であって、角パイプの互いに対向する２つの側面の一方
が長手方向に凸湾曲面となる引張側屈曲面に形成され、
他方が長手方向に凹湾曲面となる圧縮側屈曲面に形成さ
れるとともに、この圧縮側屈曲面の中央部に複数個の塑
性変形凹部を形成し、かつ全側面が略平面に形成したこ
とを特徴とする自動車用バンパービーム。1. An automobile bumper beam formed by bending and forming a square pipe disposed at a rear portion of a bumper of an automobile, wherein one of two opposing side surfaces of the square pipe has a curved surface that is convex in a longitudinal direction. Formed on the bending surface on the tensile side
The other is formed on the compression-side bent surface that becomes a concave curved surface in the longitudinal direction, and a plurality of plastic deformation recesses are formed in the center of the compression-side bent surface, and all the side surfaces are formed substantially flat. Characteristic automotive bumper beam.
面が連続する２つの横側面中央部に、前記圧縮側屈曲面
側に底辺が位置しかつ前記引張側屈曲面側に頂角が位置
するような三角形状の突起を長手方向に複数個形成した
ことを特徴とする自動車用バンパービーム。2. A bottom side is located at the compression-side bending surface side and a vertex angle is located at the tension-side bending surface side at a center portion of two lateral side surfaces where the opposite side surfaces of the square pipe are continuous with each other. An automobile bumper beam comprising a plurality of such triangular protrusions formed in a longitudinal direction.
が連続する２つの横側面中央部に、前記圧縮側屈曲面側
に長辺が位置し、且つ前記引張側座曲面側に短辺が位置
するような台形状の突起を長手方向に複数個形成したこ
とを特徴とする自動車用バンパービーム。3. A long side is located on the compression-side bent surface side and a short side is located on the tension-side curved surface side at a center portion of two lateral side surfaces on which the opposed side surfaces of the square pipe are continuous with each other. A bumper beam for an automobile, wherein a plurality of such trapezoidal protrusions are formed in the longitudinal direction.
イプを屈曲成形して、自動車用バンパービームを形成す
る場合、前記角パイプを屈曲成形する上下型のうち、下
型が、前記屈曲成形前の角パイプの幅寸法と略同等の幅
寸法を有する凹湾曲成形面を有し、この凹湾曲成形面上
に前記角パイプの互いに対向する長手方向両側面を抱持
する抱持側側壁が立設されているとともに、前記凹湾曲
成形面の両端部に互いに水平上に位置するように前記角
パイプの載置面を形成しており、また、上型が、前記下
型の抱持側壁の間寸法と略同等の幅寸法を有する凸湾曲
成形面を形成して、この凸湾曲成形面の中央部に長手方
向に向かって延在する複数個のパンチ突起を並設してい
る成形型を用いて、前記下型の凹湾曲成形面の載置面
に、前記屈曲成形前の角パイプ両端を載置セットし、次
に、前記上型を下降させて、この上型の凸湾曲成形面と
下型の凹湾曲成形面との間で、前記角パイプに曲げ荷重
を加えて屈曲成形するとともに、前記パンチ突起により
角パイプの圧縮側屈曲面側の面の中央部に塑性変形凹部
を形成するようにしたことを特徴とする自動車用バンパ
ービームの製造方法。4. When forming a bumper beam for an automobile by bending a square pipe disposed at a rear portion of a bumper of an automobile, a lower mold of the upper and lower dies for bending and forming the square pipe is formed before the bending. Has a concave curved molding surface having a width dimension substantially equal to the width dimension of the square pipe, and on the concave curved molding surface, holding side walls for holding both opposed longitudinal side surfaces of the square pipe opposing each other. And the mounting surface of the square pipe is formed so as to be positioned horizontally above each other at both ends of the concave curved forming surface, and the upper mold is provided with a holding side wall of the lower mold. A forming die having a convex curved forming surface having a width dimension substantially equal to the interval dimension, and a plurality of punch protrusions extending in the longitudinal direction arranged side by side at the center of the convex curved forming surface. Using, on the mounting surface of the concave curved molding surface of the lower mold, before the bending molding Place and set both ends of the square pipe, and then lower the upper mold, and apply a bending load to the square pipe between the convex curved molding surface of the upper mold and the concave curved molding surface of the lower mold. A method of manufacturing a bumper beam for an automobile, wherein the bumper beam is formed by bending, and a plastically deformed concave portion is formed at the center of the compression-side bent surface side of the square pipe by the punch protrusion.
向側壁に、前記上型の下降方向に延在する断面三角状の
凹部を複数条設け、該凹部により前記角パイプの屈曲成
形時に、該角パイプの互いに対向する前記長手方向側面
に連続する２つの横側面中央部に、 前記圧縮側屈曲面側に底辺が位置し且つ前記引張側屈曲
面側に頂角が位置するような三角形状の突起を形成した
ことを特徴とする自動車用バンパービームの製造方法。5. A plurality of recesses having a triangular cross section extending in the descending direction of the upper mold are provided on a side wall in contact with a side surface of the convex curved mold of the upper mold. A triangle whose center is located on the compression-side bending surface side and whose apex angle is located on the tension-side bending surface side, at the center of two lateral side surfaces continuous with the longitudinal side surfaces of the square pipe facing each other. A method of manufacturing a bumper beam for an automobile, wherein a projection having a shape is formed.
向側壁に、前記上型の下降方向に延在する断面三角状の
凹部を複数条設け、該凹部により前記角パイプの屈曲成
形時に、該角パイプの互いに対向する前記長手方向側面
に連続する２つの横側面中央部に、 前記圧縮側屈曲面側に長辺が位置し且つ前記引張側屈曲
面側に短辺が位置するような台形状の突起を形成したこ
とを特徴とする自動車用バンパービームの製造方法。6. A plurality of recesses having a triangular cross section extending in the downward direction of the upper mold are provided on a side wall in contact with a side surface of the convex curved mold of the upper mold, and the recesses are used for bending the square pipe. A long side is located on the compression side bending surface side and a short side is located on the tension side bending surface side at the center of two lateral side surfaces continuing to the longitudinal side surfaces of the square pipe facing each other. A method for manufacturing an automobile bumper beam, wherein a trapezoidal projection is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24347097A JP3870351B2 (en) | 1996-12-24 | 1997-08-26 | Bumper beam for automobile and manufacturing method thereof |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35555896 | 1996-12-24 | ||
| JP8-355558 | 1996-12-24 | ||
| JP24347097A JP3870351B2 (en) | 1996-12-24 | 1997-08-26 | Bumper beam for automobile and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10236248A true JPH10236248A (en) | 1998-09-08 |
| JP3870351B2 JP3870351B2 (en) | 2007-01-17 |
Family
ID=26536273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24347097A Expired - Lifetime JP3870351B2 (en) | 1996-12-24 | 1997-08-26 | Bumper beam for automobile and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3870351B2 (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002055230A1 (en) * | 2001-01-04 | 2002-07-18 | Futaba Industrial Co., Ltd. | Press-formed bumperreinforce having substantially b-shaped closed cross section, and method of producing the same |
| WO2002100688A1 (en) * | 2001-06-08 | 2002-12-19 | Unipres Corporation | Bumper reinforcement for vehicle body and method and device for pressingly bend-forming bumper reinforcement |
| WO2006093005A1 (en) * | 2005-03-02 | 2006-09-08 | Sumitomo Metal Industries, Ltd. | Member for reinforcing vehicle body |
| JP2006272413A (en) * | 2005-03-30 | 2006-10-12 | Kobe Steel Ltd | Shaping method of curved channel member |
| JP2008018442A (en) * | 2006-07-11 | 2008-01-31 | Nippon Steel Corp | Multistage press forming method excellent in shape freezability |
| JP2012152765A (en) * | 2011-01-24 | 2012-08-16 | Jfe Steel Corp | Method and device for producing structural component with closed cross section |
| US20120288729A1 (en) * | 2009-09-21 | 2012-11-15 | Simone De-Gale | Reinforcing system and method |
| US8419111B2 (en) | 2005-03-02 | 2013-04-16 | Nippon Steel & Sumitomo Metal Corporation | Vehicle body reinforcing member |
| WO2013153681A1 (en) * | 2012-04-13 | 2013-10-17 | Ｊｆｅスチール株式会社 | Device and method for producing closed-cross-section-structure component |
| KR101496113B1 (en) * | 2013-05-31 | 2015-02-26 | 주식회사화신 | Bumper rail for automobile |
| JP2016047687A (en) * | 2014-08-27 | 2016-04-07 | 本田技研工業株式会社 | Vehicular bumper |
| CN113523046A (en) * | 2021-06-02 | 2021-10-22 | 中国铁建港航局集团有限公司 | Ring beam bending process |
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1997
- 1997-08-26 JP JP24347097A patent/JP3870351B2/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002055230A1 (en) * | 2001-01-04 | 2002-07-18 | Futaba Industrial Co., Ltd. | Press-formed bumperreinforce having substantially b-shaped closed cross section, and method of producing the same |
| WO2002100688A1 (en) * | 2001-06-08 | 2002-12-19 | Unipres Corporation | Bumper reinforcement for vehicle body and method and device for pressingly bend-forming bumper reinforcement |
| EP1393986A1 (en) * | 2001-06-08 | 2004-03-03 | Unipres Corporation | BUMPER REINFORCEMENT FOR VEHICLE BODY AND METHOD AND DEVICE FOR PRESSINGLY BEND−FORMING BUMPER REINFORCEMENT |
| EP1393986A4 (en) * | 2001-06-08 | 2004-08-18 | Unipres Corp | Bumper reinforcement for vehicle body and method and device for pressingly bend-forming bumper reinforcement |
| US8419111B2 (en) | 2005-03-02 | 2013-04-16 | Nippon Steel & Sumitomo Metal Corporation | Vehicle body reinforcing member |
| WO2006093005A1 (en) * | 2005-03-02 | 2006-09-08 | Sumitomo Metal Industries, Ltd. | Member for reinforcing vehicle body |
| JP2006240441A (en) * | 2005-03-02 | 2006-09-14 | Sumitomo Metal Ind Ltd | Vehicle body reinforcing member |
| JP2006272413A (en) * | 2005-03-30 | 2006-10-12 | Kobe Steel Ltd | Shaping method of curved channel member |
| JP2008018442A (en) * | 2006-07-11 | 2008-01-31 | Nippon Steel Corp | Multistage press forming method excellent in shape freezability |
| US20120288729A1 (en) * | 2009-09-21 | 2012-11-15 | Simone De-Gale | Reinforcing system and method |
| JP2012152765A (en) * | 2011-01-24 | 2012-08-16 | Jfe Steel Corp | Method and device for producing structural component with closed cross section |
| WO2013153681A1 (en) * | 2012-04-13 | 2013-10-17 | Ｊｆｅスチール株式会社 | Device and method for producing closed-cross-section-structure component |
| US10160018B2 (en) | 2012-04-13 | 2018-12-25 | Jfe Steel Corporation | Method of manufacturing closed-structure part and apparatus for the same |
| US10828683B2 (en) | 2012-04-13 | 2020-11-10 | Jfe Steel Corporation | Apparatus that manufactures closed-structure part |
| KR101496113B1 (en) * | 2013-05-31 | 2015-02-26 | 주식회사화신 | Bumper rail for automobile |
| JP2016047687A (en) * | 2014-08-27 | 2016-04-07 | 本田技研工業株式会社 | Vehicular bumper |
| CN113523046A (en) * | 2021-06-02 | 2021-10-22 | 中国铁建港航局集团有限公司 | Ring beam bending process |
| CN113523046B (en) * | 2021-06-02 | 2022-09-23 | 中国铁建港航局集团有限公司 | Ring beam bending process |
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|---|---|
| JP3870351B2 (en) | 2007-01-17 |
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