JPH11333526A - Manufacture of cylindrical member for vehicle body structure - Google Patents
Manufacture of cylindrical member for vehicle body structureInfo
- Publication number
- JPH11333526A JPH11333526A JP10143297A JP14329798A JPH11333526A JP H11333526 A JPH11333526 A JP H11333526A JP 10143297 A JP10143297 A JP 10143297A JP 14329798 A JP14329798 A JP 14329798A JP H11333526 A JPH11333526 A JP H11333526A
- Authority
- JP
- Japan
- Prior art keywords
- sectional shape
- cross
- cylindrical member
- bulging
- initial
- 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.)
- Pending
Links
Landscapes
- Extrusion Of Metal (AREA)
- 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、自動車の車体を構
成する車体構造用筒状部材の製造方法に関し、より詳し
くは、曲げ加工により湾曲状に形成されると共に略矩形
形状の断面を有する車体構造用筒状部材の製造方法に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a tubular member for a vehicle body structure constituting a vehicle body of an automobile, and more particularly, to a vehicle body formed into a curved shape by bending and having a substantially rectangular cross section. The present invention relates to a method for manufacturing a structural tubular member.
【０００２】[0002]
【従来の技術】従来の車体構造用筒状部材の製造方法と
しては、例えば特開平７−３２０７６号公報に記載され
ているものがある。この製造方法は、図６に示すよう
に、略円環状断面を有するアルミニウム系材料からなる
筒状部材１を押し出し成形し（図６（ａ））、この筒状
部材１を長手方向に湾曲させる曲げ加工を施したのち
（６（ｂ））、この筒状部材２の壁面を押圧して、その
断面形状を略円環形状から略矩形形状に変化させ（図６
（ｃ））、さらに、これをバルジ金型の内部に保持した
状態でこの筒状部材３の内部に液圧等の圧力を加え、そ
の壁面をバルジ加工により膨出成形することにより（図
６（ｄ））、略矩形形状の断面を有する車体構造用筒状
部材としてのフロントサイドメンバ４を製造するもので
ある。2. Description of the Related Art As a conventional method of manufacturing a tubular member for a vehicle body structure, for example, there is a method described in Japanese Patent Application Laid-Open No. 7-32076. In this manufacturing method, as shown in FIG. 6, a cylindrical member 1 made of an aluminum-based material having a substantially annular cross section is extruded (FIG. 6A), and the cylindrical member 1 is bent in the longitudinal direction. After bending (6 (b)), the wall surface of the tubular member 2 is pressed to change the cross-sectional shape from a substantially annular shape to a substantially rectangular shape (FIG. 6).
(C)) Further, a pressure such as a liquid pressure is applied to the inside of the tubular member 3 while holding the inside of the bulge mold, and the wall surface is bulged by bulging (FIG. 6). (D)) A front side member 4 as a tubular member for a vehicle body structure having a substantially rectangular cross section is manufactured.
【０００３】ここで、上記製造方法におけるバルジ加工
についてさらに説明すると、図７（ａ）に示すように、
押圧加工にて略矩形形状の断面をなすように成形された
筒状部材３をバルジ金型１０の下型１０ａ内に保持して
上型１０ｂを加圧した際に、この筒状部材３は、先ず接
触点Ｐ１にて下型１０ａの壁面１０ａ´と、又、接触点
Ｐ２にて上型１０ｂの壁面１０ｂ´と接触する。その
後、図７（ｂ）に示すように、筒状部材３の内部に圧力
Ｐを加えると、比較的低い圧力で筒状部材３の縦壁３ｂ
及び横壁３ａが、それぞれ下型１０ａの壁面１０ａ´及
び上型１０ｂの壁面１０ｂ´に接触するまで変形する。
この際、上記接触点Ｐ１，Ｐ２は、バルジ金型１０の壁
面との摩擦により、その位置はほとんど変化しない。Here, the bulging process in the above manufacturing method will be further described. As shown in FIG.
When the cylindrical member 3 formed into a substantially rectangular cross section by pressing is held in the lower die 10a of the bulge mold 10 and the upper die 10b is pressed, the cylindrical member 3 first the wall 10a' of the lower mold 10a at the contact point P 1, also in contact with the wall surface 10b' of the upper die 10b at the contact point P 2. Thereafter, as shown in FIG. 7 (b), when a pressure P is applied to the inside of the tubular member 3, the vertical wall 3b of the tubular member 3 is kept at a relatively low pressure.
And the side wall 3a is deformed until it contacts the wall surface 10a 'of the lower die 10a and the wall surface 10b' of the upper die 10b, respectively.
At this time, the positions of the contact points P 1 and P 2 hardly change due to friction with the wall surface of the bulge mold 10.
【０００４】さらに圧力Ｐを増加させると、図７（ｃ）
に示すように、筒状部材３がバルジ金型１０の壁面に接
触していない部分、つまり接触点Ｐ１，Ｐ２間のＲ部分
（Ｌ）だけが変形し、圧力Ｐの大きさに応じて、筒状部
材３の角部３ｃが所定の角半径（Ｒ）に成形されて、図
６（ｄ）に示す筒状部材４が得られることになる。[0004] When the pressure P is further increased, FIG.
As shown in FIG. 7, only the portion where the cylindrical member 3 is not in contact with the wall surface of the bulge mold 10, that is, only the R portion (L) between the contact points P 1 and P 2 is deformed, and according to the magnitude of the pressure P. Thus, the corner 3c of the cylindrical member 3 is formed to have a predetermined angular radius (R), and the cylindrical member 4 shown in FIG. 6D is obtained.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の車体構造用筒状部材の製造方法にあっては、
略矩形形状の断面をなす筒状部材３をバルジ金型１０の
内部に保持した際に、この筒状部材３は、バルジ金型１
０の壁面１０ａ´，１０ｂ´に接触していない領域、す
なわち、接触点Ｐ１，Ｐ２間のＲ部分（Ｌ）だけが圧力
Ｐにより変形し、角半径（Ｒ）の角部が成形されるプロ
セスをとることから、肉厚に対し比較的小さい角半径の
筒状部材を得ようとする場合は、非常に高いバルジ圧力
（内圧）が必要となり、その結果、装置が大型化し、製
造コストが上昇するという問題点があった。However, in such a conventional method of manufacturing a tubular member for a vehicle body structure,
When the cylindrical member 3 having a substantially rectangular cross section is held inside the bulge mold 10, the cylindrical member 3
0 the wall 10A ', a region not in contact with 10b', i.e., only the R portion between the contact points P 1, P 2 (L) is deformed by the pressure P, the corners of the corner radius (R) is molded In order to obtain a cylindrical member having a relatively small angular radius with respect to the wall thickness, a very high bulge pressure (internal pressure) is required. Had the problem of rising.
【０００６】本発明は、このような従来技術の問題点に
鑑みて成されたものであり、その目的とするところは、
成形圧力が低いバルジ加工装置においても、比較的に小
さい角半径をなす略矩形形状の断面を成形することがで
き、又、安価でかつ容易に所望の矩形形状の断面を成形
することができる車体構造用筒状部材の製造方法を提供
することにある。[0006] The present invention has been made in view of such problems of the prior art.
A vehicle body capable of forming a substantially rectangular cross section having a relatively small corner radius even in a bulge processing apparatus having a low forming pressure, and capable of forming a desired rectangular cross section at low cost and easily. An object of the present invention is to provide a method for manufacturing a structural tubular member.
【０００７】[0007]
【課題を解決するための手段】本発明の請求項１に係る
車体構造用筒状部材の製造方法は、閉断面形状をなす筒
状部材を成形し、その後少なくとも、略矩形形状をなす
最終断面形状の外輪郭を画定するバルジ金型内に前記筒
状部材を保持した状態で前記筒状部材の内部に圧力を加
えてバルジ加工を行ない、前記バルジ加工を行なう前の
初期断面形状を略矩形形状をなす前記最終断面形状に成
形する車体構造用筒状部材の製造方法であって、前記初
期断面形状の角半径及び断面周長を前記最終断面形状の
角半径及び断面周長に略同一にし、かつ、前記初期断面
形状の縦横寸法を前記最終断面形状の縦横寸法よりも小
さくした状態で、前記バルジ加工を行なう、構成となっ
ている。According to a first aspect of the present invention, there is provided a method for manufacturing a tubular member for a vehicle body structure, comprising forming a tubular member having a closed cross-sectional shape, and thereafter forming at least a final cross-section having a substantially rectangular shape. While holding the cylindrical member in a bulge mold that defines the outer contour of the shape, pressure is applied to the inside of the cylindrical member to perform bulging, and the initial cross-sectional shape before performing the bulging is substantially rectangular. A method for manufacturing a tubular member for a vehicle body structure, which is formed into the final cross-sectional shape having a shape, wherein an angular radius and a cross-sectional peripheral length of the initial cross-sectional shape are substantially the same as an angular radius and a cross-sectional peripheral length of the final cross-sectional shape. The bulge processing is performed in a state where the vertical and horizontal dimensions of the initial cross-sectional shape are smaller than the vertical and horizontal dimensions of the final cross-sectional shape.
【０００８】本発明の請求項２に係る車体構造用筒状部
材の製造方法は、請求項１に係る車体構造用筒状部材の
製造方法において、前記最終断面形状において略平坦と
なる辺が内側に凹状となるように湾曲するように前記初
期断面形状を成形した状態で、前記バルジ加工を行な
う、構成となっている。According to a second aspect of the present invention, there is provided a method for manufacturing a cylindrical member for a vehicle body structure according to the first aspect, wherein the substantially flat side in the final sectional shape is an inner side. The bulging process is performed in a state where the initial cross-sectional shape is formed so as to be curved so as to be concave.
【０００９】本発明の請求項３に係る車体構造用筒状部
材の製造方法は、請求項１及び２に係る車体構造用筒状
部材の製造方法において、バルジ加工前の前記初期断面
形状の幅をｂ、高さをｈとし、バルジ加工後の前記最終
断面形状の幅をＢ、高さをＨとするとき、 ０．８×Ｂ≦ｂ≦０．９５×Ｂ ｈ＝（Ｈ×ｂ）／Ｂ を満足するように前記初期断面形状を成形した状態で、
前記バルジ加工を行なう、構成となっている。According to a third aspect of the present invention, there is provided a method for manufacturing a cylindrical member for a vehicle body structure according to the first and second aspects, wherein the width of the initial cross-sectional shape before bulging is provided. Where b is the height, h is the width, B is the width of the final cross-sectional shape after bulging, and H is the height. 0.8 × B ≦ b ≦ 0.95 × B h = (H × b) / B in a state where the initial cross-sectional shape is formed so as to satisfy
The bulge processing is performed.
【００１０】本発明の請求項４に係る車体構造用筒状部
材の製造方法は、請求項１ないし３に係る車体構造用筒
状部材の製造方法において、前記初期断面形状をなす筒
状部材を押し出し加工により成形し、続いて、前記押し
出し加工により得られた筒状部材に曲げ加工を施し、そ
の後、前記バルジ加工を行なう、構成となっている。According to a fourth aspect of the present invention, there is provided a method for manufacturing a cylindrical member for a vehicle body structure according to any one of the first to third aspects, wherein the cylindrical member having the initial cross-sectional shape is provided. It is configured such that the cylindrical member obtained by the extrusion is subjected to a bending process, and then the bulge process is performed.
【００１１】本発明の請求項５に係る車体構造用筒状部
材の製造方法は、請求項１ないし３に係る車体構造用筒
状部材の製造方法において、略円環状の断面形状をなす
筒状部材を押し出し加工により成形し、続いて、前記略
円環状の断面形状が前記初期断面形状となるように前記
筒状部材を押圧加工により成形し、さらに続いて、前記
初期断面形状に成形された筒状部材に曲げ加工を施し、
その後、前記バルジ加工を行なう、構成となっている。According to a fifth aspect of the present invention, there is provided a method of manufacturing a cylindrical member for a vehicle body structure according to any one of the first to third aspects, wherein the cylindrical member having a substantially annular cross section is provided. The member was formed by extrusion, and then the cylindrical member was formed by pressing so that the substantially annular cross-sectional shape became the initial cross-sectional shape. Bending the cylindrical member,
Thereafter, the bulge processing is performed.
【００１２】本発明の請求項６に係る車体構造用筒状部
材の製造方法は、請求項１ないし３に係る車体構造用筒
状部材の製造方法において、略円環状の断面形状をなす
筒状部材を押し出し加工により成形し、続いて、前記筒
状部材に曲げ加工を施し、さらに続いて、前記略円環状
の断面形状が前記初期断面形状となるように前記筒状部
材を押圧加工により成形し、その後、前記バルジ加工を
行なう、構成となっている。According to a sixth aspect of the present invention, there is provided a method of manufacturing a cylindrical member for a vehicle body structure according to the first to third aspects, wherein the cylindrical member having a substantially annular cross section is provided. The member is formed by extrusion processing, subsequently, bending processing is performed on the cylindrical member, and further, the cylindrical member is formed by pressing processing so that the substantially annular cross-sectional shape becomes the initial cross-sectional shape. Thereafter, the bulge processing is performed.
【００１３】本発明の請求項７に係る車体構造用筒状部
材の製造方法は、請求項６に係る車体構造用筒状部材の
製造方法において、前記押圧加工を行なう際に、前記筒
状部材の内部に圧力を加えながら行なう、構成となって
いる。According to a seventh aspect of the present invention, there is provided a method for manufacturing a cylindrical member for a vehicle body structure according to the sixth aspect, wherein the pressing is performed when the pressing is performed. Is performed while applying pressure to the inside of the device.
【００１４】[0014]
【発明の効果】本発明の請求項１に係る車体構造用筒状
部材の製造方法によれば、バルジ加工を行なう前の初期
断面形状の角半径及び断面周長をバルジ加工後の最終断
面形状の角半径及び断面周長に略同一にしかつ初期断面
形状の縦横寸法を最終断面形状の縦横寸法すなわちバル
ジ金型内部空間の縦横寸法よりも小さくした状態でバル
ジ加工を行なうことから、成形圧力の低いバルジ加工装
置を用いても、角半径が比較的小さい略矩形形状の閉断
面をなす筒状部材を安価でかつ容易に製造することがで
きる。According to the method for manufacturing a tubular member for a vehicle body structure according to the first aspect of the present invention, the angular radius and the cross-sectional circumferential length of the initial cross-sectional shape before performing the bulge processing are changed to the final cross-sectional shape after the bulge processing. Since the bulge processing is performed in a state in which the vertical and horizontal dimensions of the initial cross-sectional shape are made smaller than the vertical and horizontal dimensions of the final cross-sectional shape, that is, the vertical and horizontal dimensions of the internal space of the bulge mold, are substantially equal to the angular radius and the cross-sectional circumferential length of Even if a low bulge processing apparatus is used, a cylindrical member having a substantially rectangular closed section having a relatively small angular radius can be manufactured at low cost and easily.
【００１５】本発明の請求項２に係る車体構造用筒状部
材の製造方法によれば、バルジ加工を行なう前の初期断
面形状において、最終断面形状で略平坦となる面を画定
する辺が内側に凹状に湾曲するように成形し、その状態
でバルジ加工を行なうことから、内側に湾曲した壁面は
剛性が低いため徐々に伸ばされて、最終断面形状の角半
径と略一致して成形された初期断面形状の角半径を維持
した状態でバルジ加工による膨出成形が行なわれ、より
確実に所望の角半径をなす筒状部材を製造することがで
きる。According to the method for manufacturing a tubular member for a vehicle body structure according to the second aspect of the present invention, in the initial cross-sectional shape before bulging, the side defining the substantially flat surface in the final cross-sectional shape has an inner side. Since the bulge processing is performed in that state, the inwardly curved wall surface has low rigidity and is gradually stretched, and is formed so as to substantially match the corner radius of the final sectional shape. The bulging process is performed in a state where the angular radius of the initial cross-sectional shape is maintained, and a cylindrical member having a desired angular radius can be manufactured more reliably.
【００１６】本発明の請求項３に係る車体構造用筒状部
材の製造方法によれば、バルジ加工を行なうにあたり、
筒状部材をバルジ金型内に入れて、バルジ金型の型締め
を行なっても、金型の分割面領域に筒状部材を挟み込む
ような不具合を生じることはなく、又、成形圧力の低い
バルジ加工装置を用いても、角半径が比較的小さい略矩
形形状の閉断面をなす筒状部材を安価でかつ容易に製造
することができる。According to the method for manufacturing a tubular member for a vehicle body structure according to the third aspect of the present invention, when performing bulging,
Even if the cylindrical member is placed in the bulge mold and the bulge mold is clamped, there is no problem that the cylindrical member is pinched in the divided surface area of the mold, and the molding pressure is low. Even if a bulge processing device is used, a tubular member having a substantially rectangular closed section having a relatively small angular radius can be manufactured at low cost and easily.
【００１７】本発明の請求項４に係る車体構造用筒状部
材の製造方法によれば、曲げ加工を行なう前に、予めバ
ルジ加工を行なう前の初期断面形状に成形していること
から、曲げ加工の際に筒状部材に皺などの加工不具合を
生じることなく曲げ加工を行なうことができ、又、押圧
加工の工程を削除することができ、工程の簡略化を行な
うことができる。According to the method of manufacturing a tubular member for a vehicle body structure according to the fourth aspect of the present invention, since the initial cross-sectional shape before the bulging is performed before the bending, the bending is performed. Bending can be performed without causing processing defects such as wrinkles on the cylindrical member during processing, and the pressing process can be omitted, and the process can be simplified.
【００１８】本発明の請求項５に係る車体構造用筒状部
材の製造方法によれば、曲げ加工を行なう前の真直材の
状態で、バルジ加工を行なう前の初期断面形状となるよ
うに押圧加工を行なうことから、この押圧加圧を容易に
行なうことができる。According to the method of manufacturing a tubular member for a vehicle body structure according to the fifth aspect of the present invention, the straight member before the bending is pressed so as to have the initial sectional shape before the bulging. Since the processing is performed, the pressing and pressing can be easily performed.
【００１９】本発明の請求項６に係る車体構造用筒状部
材の製造方法によれば、略円環状の断面をなす筒状部材
の状態で曲げ加工を行なうことから、この曲げ加工を比
較的容易に行なうことができ、曲げ加工による大きな断
面変形あるいは皺などの加工不具合の発生を防止するこ
とができる。According to the method of manufacturing a tubular member for a vehicle body structure according to the sixth aspect of the present invention, since the bending is performed in a state of the tubular member having a substantially annular cross section, the bending is relatively difficult. This can be easily performed, and the occurrence of processing defects such as large cross-sectional deformation or wrinkles due to bending can be prevented.
【００２０】本発明の請求項７に係る車体構造用筒状部
材の製造方法によれば、筒状部材の内部に圧力を加えな
がら押圧加工を行なうことから、略円環状断面形状をな
す筒状部材をバルジ加工前の略矩形をなす初期断面形状
の筒状部材に比較的容易に成形することができる。According to the method for manufacturing a tubular member for a vehicle body structure according to claim 7 of the present invention, since the pressing is performed while applying pressure to the inside of the tubular member, the tubular member having a substantially annular cross-sectional shape is formed. The member can be relatively easily formed into a substantially rectangular tubular member having an initial cross-sectional shape before bulging.
【００２１】[0021]
【発明の実施の形態】以下、本発明の実施例を添付図面
に基づいて説明する。Embodiments of the present invention will be described below with reference to the accompanying drawings.
【００２２】図１は、本発明に係る車体構造用筒状部材
の製造方法の第１実施例を示すものであり、この実施例
では、閉断面形状をなした筒状部材２０を押出し成形
し、曲げ加工や押圧加工を行なった後、図１（ａ）に示
すように、この筒状部材２０を下型２１ａと上型２１ｂ
とからなるバルジ金型２１の内部に保持した状態で、図
１（ｂ）に示すように、筒状部材２０の内部に圧力Ｐ１
を加えて、その壁面をバルジ加工により膨出成形し、そ
の断面形状をバルジ加工前の初期断面形状２０´から、
図１（ｃ）に示すような概略矩形形状の最終断面形状２
０´´に変化させる。すなわち、筒状部材２０のバルジ
加工前の初期断面形状２０´の角半径ｒ１及び断面周長
Ｍ１を、バルジ加工後の最終断面形状２０´´の角半径
ｒ０及び断面周長Ｍ０に概略一致させるとともに、上記
初期断面形状２０´の縦横寸法が最終断面形状２０´´
の縦横寸法より小さくなるようにし、その関係を最終断
面形状２０´´の幅をＢ，高さをＨ、バルジ加工前の初
期面形状２０´の幅をｂ，高さをｈとするとき、次式
（１） ０．８×Ｂ≦ｂ≦０．９５×Ｂ ・・・（１） ｈ＝（Ｈ×ｂ）／Ｂ の関係を満たすようにし、さらに、最終断面形状２０´
´にて略平坦となる辺が内側に凹状に湾曲するように、
バルジ加工前の初期断面形状２０´をなす筒状部材２０
を押し出し加工により成形した後、この筒状部材２０を
適宜に回転引き曲げやプレス曲げなどの任意の曲げ加工
方法により曲げ加工し、しかる後に、バルジ金型２１の
下型２１ａ及び上型２１ｂにより形成される内部空間に
保持した状態で、筒状部材２０の内部に圧力Ｐ１を加え
て、内側に凹状となる湾曲面２０ａ，２０ｂで構成され
た壁面を膨出成形する。FIG. 1 shows a first embodiment of a method for manufacturing a tubular member for a vehicle body structure according to the present invention. In this embodiment, a tubular member 20 having a closed cross section is formed by extrusion. After performing bending and pressing, as shown in FIG. 1A, the cylindrical member 20 is moved to a lower mold 21a and an upper mold 21b.
1B, the pressure P 1 is held inside the cylindrical member 20 while being held inside the bulge mold 21 composed of
And the wall surface is bulged by bulging, and the cross-sectional shape is changed from the initial cross-sectional shape 20 ′ before bulging.
Final sectional shape 2 of a substantially rectangular shape as shown in FIG.
Change to 0 ''. That is, the angular radius r 1 and the cross-sectional circumference M 1 of the initial cross-sectional shape 20 ′ of the cylindrical member 20 before the bulging are changed from the angular radius r 0 and the cross-sectional circumference M 0 of the final cross-sectional shape 20 ″ after the bulging. And the vertical and horizontal dimensions of the initial sectional shape 20 ′ are the same as the final sectional shape 20 ″.
When the width of the final cross-sectional shape 20 ″ is B, the height is H, the width of the initial surface shape 20 ′ before bulging is b, and the height is h, the relationship is as follows. The following equation (1) 0.8 × B ≦ b ≦ 0.95 × B (1) The relationship of h = (H × b) / B is satisfied, and the final sectional shape 20 ′ is satisfied.
'So that the side that becomes substantially flat curves concavely inward,
A tubular member 20 having an initial sectional shape 20 'before bulging
After being formed by extrusion, the cylindrical member 20 is appropriately bent by an arbitrary bending method such as rotary pull bending or press bending, and then, by the lower mold 21a and the upper mold 21b of the bulge mold 21. while maintaining the inner space formed by applying a pressure P 1 into the cylindrical member 20, the curved surface 20a of the concave and configured wall surface 20b bulges forming on the inside.
【００２３】本実施例の製造方法における加工及び変形
過程についてさらに説明すると、上記初期面形状２０´
の筒状部材２０を押し出し加工により成形したのち、こ
の筒状部材２０を適宜に曲げ加工し、しかる後にバルジ
金型２１（２１ａ，２１ｂ）の内部に保持した状態で、
筒状部材２０の内部に圧力Ｐ１を加えるバルジ成形を施
すと、図１（ｂ）に示すように、内側に凹状をなす湾曲
面２０ａ，２０ｂで構成された壁面は、剛性が低いため
徐々に伸ばされて、初期断面形状２０´の角半径ｒ１を
維持した状態で膨出成形される。The working and deformation processes in the manufacturing method of this embodiment will be further described.
After the cylindrical member 20 is formed by extrusion, the cylindrical member 20 is appropriately bent and then held in the bulge mold 21 (21a, 21b).
When subjected to bulge forming applying pressure P 1 inside the tubular member 20, as shown in FIG. 1 (b), gradual because the curved surface 20a, configured wall surface 20b, the low rigidity forming a recessed inwardly is stretched, it is bulged molded while maintaining the angular radius r 1 of the initial cross-sectional shape 20 '.
【００２４】そして、初期断面形状２０´の縦横寸法が
最終断面形状２０´´の縦横寸法より小さくなるように
し、最終断面形状２０´´の幅をＢ，高さをＨ、バルジ
加工前の初期断面形状２０´の幅をｂ，高さをｈとする
とき、前述（１）式の関係を満たすように、初期断面形
状２０´を成形しているため、図１（ｃ）に示すよう
に、バルジ加工後に縦壁面となる内側に凹状をなす湾曲
面２０ａと、バルジ加工後に横壁面となる内側に凹状を
示す湾曲面２０ｂとが、バルジ金型２１（２１ａ，２１
ｂ）の内壁面にそれぞれほぼ同時に接触する。The vertical and horizontal dimensions of the initial cross-sectional shape 20 ′ are smaller than the vertical and horizontal dimensions of the final cross-sectional shape 20 ″, the width of the final cross-sectional shape 20 ″ is B, the height is H, and the initial Assuming that the width of the cross-sectional shape 20 'is b and the height is h, the initial cross-sectional shape 20' is formed so as to satisfy the relationship of the above formula (1). A curved surface 20a having an inner concave surface which becomes a vertical wall surface after bulging and a curved surface 20b having an inner concave surface which becomes a horizontal wall surface after bulging are formed by a bulge mold 21 (21a, 21).
b) almost simultaneously contact the inner wall surfaces.
【００２５】この際、初期断面形状２０´の断面周長Ｍ
１と最終断面形状２０´´の断面周長Ｍ０とが略同一と
なるように、初期断面形状２０´が成形されているた
め、膨出成形しても塑性加工されて断面周方向に伸ばさ
れることがない。つまり、最終断面形状２０´´の角半
径ｒ０と初期断面形状２０´の角半径ｒ１とが略同一と
なるように成形された上記初期断面形状２０´の角半径
ｒ１を維持した状態で加工を終了する。At this time, the sectional circumference M of the initial sectional shape 20 '
As the 1 and the final cross-sectional shape 20 '' of the cross-sectional peripheral length M 0 becomes substantially equal, since the initial cross-section 20 'is formed, even bulges shaped plastically processed stretched in the cross-sectional circumferential direction Never be. In other words, a state in which the final cross-sectional corner radius r 0 of the shape 20 '' and the initial cross-sectional shape 20 'corner radius r 1 of maintaining the corner radius r 1 of the initial cross-sectional shape 20' that is shaped so as to be substantially equal To end the processing.
【００２６】従って、成形圧力の低いバルジ加工装置を
用いても、角半径が比較的小さい略矩形形状の筒状部材
を、安価でかつ容易に製造することが可能となる。Therefore, even if a bulge processing apparatus having a low molding pressure is used, a substantially rectangular cylindrical member having a relatively small angular radius can be manufactured at low cost and easily.
【００２７】ここでは、最終断面形状２０´´の幅を
Ｂ，高さをＨ、バルジ加工前の初期断面形状２０´の幅
をｂ，高さをｈとするとき、前述（１）式、すなわち、 ０．８×Ｂ≦ｂ≦０．９５×Ｂ ｈ＝（Ｈ×ｂ）／Ｂ の関係を満たすように、上記初期断面形状２０´を成形
したが、ｂ＝ｂ１，ｈ＝ｈ１として、図２に示すよう
に、それぞれ ｂ１＝０．８×Ｂ ｈ１＝（Ｈ×ｂ１）×Ｂ となるようにした場合、内側に凹状となる湾曲面２０ａ
´，２０ｂ´の剛性が高くなって容易に伸ばされず、膨
出成形される限界となる。そして、 ｂ＜０．８×Ｂ となるようにした場合、もはや膨出成形が行なわれなく
なる。一方、 ｂ＞０．９５×Ｂ となるようにした場合、バルジ金型２１（２１ａ，２１
ｂ）との隙間が小さくなるため、曲げ加工後の膨出過程
において、初期断面形状２０´の筒状部材２０がバルジ
金型２１（２１ａ，２１ｂ）の壁面に接触し、その変形
が拘束される場合があり、意図した成形プロセスが得ら
れないため、大きくても ｂ＝０．９５×Ｂ の関係を満たす初期断面形状２０´に成形するのが望ま
しい。Here, assuming that the width of the final sectional shape 20 ″ is B, the height is H, the width of the initial sectional shape 20 ′ before bulging is b, and the height is h, That is, the initial cross-sectional shape 20 ′ was formed so as to satisfy the relationship of 0.8 × B ≦ b ≦ 0.95 × B h = (H × b) / B, but b = b 1 , h = h as 1, as shown in FIG. 2, respectively b 1 = 0.8 × B h 1 = (H × b 1) when set to be × B, the curved surface 20a of the concave inner
, 20b 'are not easily stretched due to their increased rigidity, which is the limit of bulging. When b <0.8 × B, the bulging molding is no longer performed. On the other hand, when b> 0.95 × B, the bulge mold 21 (21a, 21b) is used.
b), the cylindrical member 20 having the initial cross-sectional shape 20 ′ comes into contact with the wall surface of the bulge mold 21 (21a, 21b) in the swelling process after the bending process, and the deformation thereof is restrained. In some cases, an intended molding process cannot be obtained, and therefore, it is desirable to mold to an initial cross-sectional shape 20 ′ that satisfies the relationship of b = 0.95 × B at most.
【００２８】図３は、本発明に係る車体構造用筒状部材
の製造方法の第２実施例を示すものであり、図６（ａ）
のように押し出し加工により略円環状の断面形状をなす
ように成形された筒状部材３０を、図３に示すように、
その中空内部に押圧成形芯金３１を挿入した状態で、押
圧金型３２で保持し、この押圧金型３２を型締めするこ
とにより押圧加工する。この押圧加工により、略円環状
の断面形状をなす筒状部材３０をバルジ加工前の初期断
面形状３０´に成形する。FIG. 3 shows a second embodiment of the method for manufacturing a tubular member for a vehicle body structure according to the present invention.
As shown in FIG. 3, a cylindrical member 30 formed to have a substantially annular cross-sectional shape by extrusion processing as shown in FIG.
In a state in which the press-molded core metal 31 is inserted into the inside of the hollow, it is held by a press mold 32, and the press mold 32 is clamped to perform press working. By this pressing, the cylindrical member 30 having a substantially annular cross-sectional shape is formed into an initial cross-sectional shape 30 'before bulging.
【００２９】この際、バルジ加工前の初期断面形状３０
´の角半径ｒ２及び断面周長Ｍ２を、バルジ加工後の最
終断面形状３０´´の角半径ｒ０及び断面周長Ｍ０に概
略一致させるとともに、上記初期断面形状３０´の縦横
寸法が最終断面形状３０´´の縦横寸法より小さくなる
ようにし、その関係を最終断面形状３０´´の幅をＢ，
高さをＨ、バルジ加工前の初期断面形状３０の幅を
ｂ２，高さをｈ２とするとき、次式（２） ０．８×Ｂ≦ｂ２≦０．９５×Ｂ ・・・（２） ｈ２＝（Ｈ×ｂ２）／Ｂ の関係を満たすようにし、さらに、最終断面形状３０´
´にて略平坦となる辺が内側に凹状に湾曲するように、
バルジ加工前の初期断面形状３０´をなす筒状部材３０
に押圧成形する。At this time, the initial sectional shape 30 before the bulge processing is performed.
′, The angular radius r 2 and the cross-sectional circumference M 2 of the final cross-sectional shape 30 ″ after bulging are substantially matched with the angular radius r 0 and the cross-sectional circumference M 0, and the vertical and horizontal dimensions of the initial cross-sectional shape 30 ′ Is smaller than the vertical and horizontal dimensions of the final cross-sectional shape 30 ″, and the relationship is defined as the width of the final cross-sectional shape 30 ″ being B,
Assuming that the height is H, the width of the initial cross-sectional shape 30 before bulging is b 2 , and the height is h 2 , the following equation (2): 0.8 × B ≦ b 2 ≦ 0.95 × B (2) The relationship of h 2 = (H × b 2 ) / B is satisfied, and the final sectional shape 30 ′
'So that the side that becomes substantially flat curves concavely inward,
A cylindrical member 30 having an initial cross-sectional shape 30 'before bulging
Press molding.
【００３０】次に、この押圧加工後の筒状部材３０を適
宜回転引き曲げやプレス曲げなどの任意の曲げ加工方法
により曲げ加工し、しかる後に、前述実施例同様バルジ
金型２１（２１ａ，２１ｂ）の内部空間に保持した状態
（図１（ａ）参照）で、筒状部材３０の内部に圧力Ｐ１
を加えて（図１（ｂ）参照）、内側に凹状となる湾曲面
３０ａ，３０ｂで構成された壁面を膨出成形する。Next, the cylindrical member 30 after the pressing is bent by an arbitrary bending method such as rotary drawing or press bending, and thereafter, the bulge mold 21 (21a, 21b) is used in the same manner as in the previous embodiment. ) In the internal space (see FIG. 1A), the pressure P 1
(See FIG. 1B) to bulge out the wall surface formed by the curved surfaces 30a and 30b that are concave inside.
【００３１】本実施例の製造方法における加工及び変形
過程について説明すると、押し出し加工により略円環状
の断面形状に成形された筒状部材３０を、押圧加工によ
り上記初期断面形状３０´をなす筒状部材３０に成形
し、しかる後に、バルジ金型２１（２１ａ，２１ｂ）の
内部空間に保持した状態で、筒状部材３０の内部に圧力
Ｐ１を加えるバルジ成形を施すと、前述第１実施例と同
様に（図による説明は省略する）、初期断面形状３０´
の内側に凹状をなす湾曲面３０ａ，３０ｂで構成された
壁面は、剛性が低いために徐々に伸ばされて、初期断面
形状３０´の角半径ｒ２を維持した状態で膨出成形され
る。A process and a deformation process in the manufacturing method of this embodiment will be described. A cylindrical member 30 formed into a substantially annular cross-sectional shape by extrusion is formed into a cylindrical shape having the initial cross-sectional shape 30 'by pressing. shaped members 30, and thereafter, the bulge die 21 (21a, 21b) while maintaining the inner space of, when subjected to bulge forming applying pressure P 1 into the cylindrical member 30, the aforementioned first embodiment In the same manner as described above (the illustration is omitted), the initial cross-sectional shape 30 ′
Curved surface 30a, a wall made up of 30b which the inside forms a concave, gradually extended to low rigidity, is bulged molded while maintaining the angular radius r 2 of the initial cross-sectional shape 30 '.
【００３２】そして、初期断面形状３０´の縦横寸法が
最終断面形状３０´´の縦横寸法より小さくなるように
し、最終断面形状３０´´の幅をＢ，高さをＨ、バルジ
加工前の初期断面形状３０´の幅をｂ２，高さをｈ２と
するとき、前述（２）式の関係を満たすように、初期断
面形状３０´を成形しているため、前述第１実施例と同
様に、バルジ加工後に縦壁面となる内側に凹状をなす湾
曲面３０ａとバルジ加工後に横壁面となる内側に凹状を
なす湾曲面３０ｂとが、バルジ金型２１（２１ａ，２１
ｂ）の内壁面にそれぞれほぼ同時に接触する。The vertical and horizontal dimensions of the initial cross-sectional shape 30 ″ are smaller than the vertical and horizontal dimensions of the final cross-sectional shape 30 ″, the width of the final cross-sectional shape 30 ″ is B, the height is H, and the initial When the width of the cross-sectional shape 30 ′ is b 2 and the height is h 2 , the initial cross-sectional shape 30 ′ is formed so as to satisfy the relationship of the above-described formula (2). In addition, a curved surface 30a having an inward concave shape that becomes a vertical wall surface after bulging and a curved surface 30b having an inward concave shape that becomes a horizontal wall surface after bulging are formed by a bulge mold 21 (21a, 21).
b) almost simultaneously contact the inner wall surfaces.
【００３３】この際、初期断面形状３０´の断面周長Ｍ
２と最終断面形状３０´´の断面周長Ｍ０とが略同一と
なるように、初期断面形状３０´が成形されているた
め、前述第１実施例と同様に、膨出成形しても塑性加工
されて断面周方向に伸ばされることがない。つまり、最
終断面形状３０´´の角半径ｒ０と初期断面形状３０´
の角半径ｒ２とが略同一となるように成形された上記初
期断面形状３０´の角半径ｒ２を維持した状態で加工を
終了する。At this time, the sectional circumference M of the initial sectional shape 30 '
As the 2 and the final cross-shaped cross-section circumferential length M 0 of 30'' is substantially the same, because the initial cross-section 30 'is formed, similarly to the above first embodiment, even when swollen molding It is not plastically stretched in the circumferential direction of the cross section. That is, the corner radius r 0 of the final sectional shape 30 ″ and the initial sectional shape 30 ″
And corner radius r 2 finishes processing while maintaining the angular radius r 2 of the formed the initial cross-sectional shape 30 'so as to be substantially identical.
【００３４】従って、成形圧力の低いバルジ加工装置を
用いても、角半径が比較的小さい略矩形形状の筒状部材
を、安価でかつ容易に製造することができる。Therefore, even if a bulge processing apparatus having a low molding pressure is used, a substantially rectangular cylindrical member having a relatively small angular radius can be easily manufactured at low cost.
【００３５】図４は、本発明に係る車体構造用筒状部材
の製造方法の第３実施例を示すものであり、図６（ａ）
のように押し出し加工により略円環状の断面形状をなす
ように成形された筒状部材４０を、適宜に回転引き曲げ
やプレス曲げなどの任意の曲げ加工方法により曲げ加工
し、図６（ｂ）に示すように、長手方向において湾曲
し、略円環状の断面形状をなす筒状部材４０を成形す
る。次に、図４に示すように、この筒状部材４０を、そ
の中空内部に分割した押圧成形芯金４１（４１ａ，４１
ｂ）を挿入した状態で、押圧金型４２で保持し、この押
圧金型４２を型締めすることにより押圧加工する。この
押圧加工により、略円環状の断面形状をなす筒状部材４
０をバルジ加工前の初期断面形状４０´に成形する。FIG. 4 shows a third embodiment of the method for manufacturing a tubular member for a vehicle body structure according to the present invention.
The cylindrical member 40 formed to have a substantially annular cross-sectional shape by extrusion as described above is bent by an arbitrary bending method such as rotary pull bending or press bending, as shown in FIG. As shown in (1), a cylindrical member 40 that is curved in the longitudinal direction and has a substantially annular cross-sectional shape is formed. Next, as shown in FIG. 4, this cylindrical member 40 is divided into a press-molded core 41 (41a, 41
In a state in which b) is inserted, the pressing die 42 is held by a pressing die 42, and the pressing die 42 is clamped to be pressed. By this pressing, the cylindrical member 4 having a substantially annular cross section is formed.
0 is formed into an initial sectional shape 40 'before bulging.
【００３６】この際、バルジ加工前の初期断面形状４０
´の角半径ｒ３及び断面周長Ｍ３を、バルジ加工後の最
終断面形状４０´´の角半径ｒ０及び断面周長Ｍ０に概
略一致させるとともに、上記初期断面形状４０´の縦横
寸法が最終断面形状４０´´の縦横寸法より小さくなる
ようにし、その関係を最終断面形状４０´´の幅をＢ，
高さをＨ、バルジ加工前の初期断面形状４０´の幅をｂ
３，高さをｈ３とするとき、次式（３） ０．８×Ｂ≦ｂ３≦０．９５×Ｂ ・・・（３） ｈ３＝（Ｈ×ｂ３）／Ｂ の関係を満たすようにし、さらに、最終断面形状４０´
´にて略平坦となる辺が内側に凹状に湾曲するようにバ
ルジ加工前の初期断面形状４０´をなす筒状部材４０に
押圧成形する。At this time, the initial sectional shape 40 before the bulge processing is performed.
′, The angular radius r 3 and the cross-sectional circumference M 3 of the final cross-sectional shape 40 ″ after the bulging process are made to substantially match the angular radius r 0 and the cross-sectional circumference M 0 of the final cross-sectional shape 40 ″. Is smaller than the vertical and horizontal dimensions of the final cross-sectional shape 40 ″, and the relationship is defined as the width of the final cross-sectional shape 40 ″ being B,
The height is H, and the width of the initial cross-sectional shape 40 'before bulging is b.
3 , when the height is h 3 , the following equation (3): 0.8 × B ≦ b 3 ≦ 0.95 × B (3) The relationship of h 3 = (H × b 3 ) / B And a final cross-sectional shape 40 ′
'Is pressed into a cylindrical member 40 having an initial cross-sectional shape 40' before bulging so that a substantially flat side is curved inwardly into a concave shape.
【００３７】そして、しかる後に、バルジ金型２１（２
１ａ，２１ｂ）の内部空間に保持した状態（図１（ａ）
参照）で、筒状部材４０の内部に圧力Ｐ１を加えて（図
１（ｂ）参照）、内側に凹状となる湾曲面４０ａ，４０
ｂで構成された壁面を膨出成形する。Thereafter, the bulge mold 21 (2
1a, 21b) (FIG. 1 (a))
By reference), the reference applies pressure P 1 inside the tubular member 40 (FIG. 1 (b)), the curved surface 40a, 40 to be concave on the inside
The wall formed by b is bulged.
【００３８】本実施例の製造方法における加工及び変形
過程について説明すると、略円環状の断面形状をなす筒
状部材４０を適宜に曲げ加工し、図６（ｂ）に示すよう
に、略円環状の断面形状をなすとともに長手方向におい
て湾曲した筒状部材４０を成形する。The processing and deformation process in the manufacturing method of this embodiment will be described. The cylindrical member 40 having a substantially annular cross-sectional shape is appropriately bent to form a substantially annular shape as shown in FIG. A cylindrical member 40 having a cross-sectional shape and curved in the longitudinal direction is formed.
【００３９】この際、略円環状の断面形状をなす状態
で、筒状部材４０に曲げ加工を施すため、曲げ加工を比
較的容易に行なうことができ、曲げ加工による大きな断
面変形や皺などの加工不具合を発生させることなく、長
手方向において湾曲し、かつ、略円環状の断面形状をな
す筒状部材４０の成形が可能となる。At this time, since the cylindrical member 40 is bent in a substantially annular cross-sectional shape, the bending can be performed relatively easily. It is possible to form the cylindrical member 40 that is curved in the longitudinal direction and has a substantially annular cross-sectional shape without causing a processing defect.
【００４０】次に、図４に示すように、上記筒状部材４
０が長手方向において湾曲しているため、可撓性を確保
するように分割した押圧成形芯金４１（４１ａ，４１
ｂ）をこの筒状部材４０の中空内部に挿入し、押圧金型
４２で保持し、この押圧金型４２を型締めすることによ
り、押圧加工する。この押圧加工により、筒状部材４０
の断面形状を略円環状からバルジ加工前の初期断面形状
に成形し、しかる後に、バルジ金型２１（２１ａ，２１
ｂ）の内部空間に保持した状態で、筒状部材４０の内部
に圧力Ｐ１を加えるバルジ成形を施すと、前述第１実施
例と同様に（図による説明は省略する）、初期断面形状
４０´の内側に凹状をなす湾曲面４０ａ，４０ｂで構成
された壁面は、剛性が低いために徐々に伸ばされて、初
期断面形状４０´の角半径ｒ３を維持した状態で膨出成
形される。Next, as shown in FIG.
Since 0 is curved in the longitudinal direction, the press-molded core 41 (41 a, 41 a) is divided so as to secure flexibility.
b) is inserted into the hollow interior of the cylindrical member 40, is held by a pressing mold 42, and is pressed by clamping the pressing mold 42. By this pressing, the cylindrical member 40
Is formed from a substantially annular shape to an initial cross-sectional shape before bulge processing, and thereafter, the bulge mold 21 (21a, 21) is formed.
while maintaining the inner space of b), when subjected to bulge forming applying pressure P 1 into the cylindrical member 40, similarly to the aforementioned first embodiment (described by figure omitted), the initial cross-section 40 curved surface 40a, a wall comprised of 40b which inside forms a concave 'is gradually extended to low rigidity, is bulged molded while maintaining the angular radius r 3 of the initial cross-sectional shape 40' .
【００４１】そして、初期断面形状４０´の縦横寸法が
最終断面形状４０´´の縦横寸法より小さくなるように
し、最終断面形状４０´´の幅をＢ，高さをＨ、バルジ
加工前の初期断面形状４０´の幅をｂ３，高さをｈ３と
するとき、前述（３）式の関係を満たすように、初期断
面形状４０´を成形しているため、前述第１実施例と同
様に、バルジ加工後に縦壁面となる内側に凹状をなす湾
曲面４０ａとバルジ加工後に横壁面となる内側に凹状を
なす湾曲面４０ｂとが、バルジ金型２１（２１ａ，２１
ｂ）の内壁面にそれぞれほぼ同時に接触する。The vertical and horizontal dimensions of the initial cross-sectional shape 40 'are made smaller than the vertical and horizontal dimensions of the final cross-sectional shape 40'', the width of the final cross-sectional shape 40''is B, the height is H, and the initial When the width of the cross-sectional shape 40 ′ is b 3 and the height is h 3 , the initial cross-sectional shape 40 ′ is formed so as to satisfy the relationship of the above formula (3). In addition, a curved surface 40a having an inward concave shape that becomes a vertical wall surface after bulging and a curved surface 40b having an inward concave shape that becomes a horizontal wall surface after bulging are formed by the bulge mold 21 (21a, 21).
b) almost simultaneously contact the inner wall surfaces.
【００４２】この際、初期断面形状４０´の断面周長Ｍ
３と最終断面形状４０´´の断面周長Ｍ０と略同一とな
るように、初期断面形状４０´が成形されているため、
前述第１実施例と同様に、膨出成形しても塑性加工され
て断面周方向に伸ばされることがない。つまり、最終断
面形状４０´´の角半径ｒ０と初期断面形状４０´の角
半径ｒ３とが略同一となるように成形された上記初期断
面形状４０´の角半径ｒ３を維持した状態で加工を終了
する。At this time, the cross-sectional circumference M of the initial cross-sectional shape 40 '
3 and the final cross-sectional shape 40'' of so sectional circumferential length M 0 and substantially the same, because the initial cross-section 40 'is formed,
As in the case of the first embodiment, even when bulging is performed, it is not plastically worked and stretched in the circumferential direction of the cross section. In other words, a state in which the final cross-sectional shape 40'' corner radius r 0 and an initial cross-sectional shape 40 'corner radius r 3 of the maintained square radius r 3 of the initial cross-sectional shape 40' that is shaped so as to be substantially equal To end the processing.
【００４３】従って、成形圧力の低いバルジ加工装置を
用いても、角半径が比較的小さい略矩形断面形状の筒状
部材を、安価でかつ容易に製造することが可能となる。Therefore, even if a bulge processing apparatus having a low molding pressure is used, a cylindrical member having a substantially rectangular cross-sectional shape with a relatively small angular radius can be manufactured at low cost and easily.
【００４４】尚、本実施例においては、押圧加工の際
に、可撓性を確保するように分割した押圧成形芯金４１
（４１ａ，４１ｂ）を採用し、この押圧成形芯金４１を
筒状部材４０の中空内部に挿入し、押圧金型４２を型締
めすることにより押圧加工を行なうようにしたが、図５
に示すように、曲げ加工により長手方向において湾曲さ
せられた筒状部材４０の中空内部に液圧Ｐ２を作用さ
せ、押圧芯金効果を作用させながら、押圧金型４２を型
締めすることにより押圧加工し、バルジ加工前の初期断
面形状４０´を成形する方法を採用することも可能であ
る。In this embodiment, in the pressing process, the press-molded core 41 is divided so as to ensure flexibility.
(41a, 41b), the press-molded core 41 is inserted into the hollow portion of the tubular member 40, and the press mold 42 is clamped to perform the press working.
As shown in ( 2) , by applying a hydraulic pressure P2 to the hollow interior of the cylindrical member 40 curved in the longitudinal direction by the bending process, and by pressing the pressing core effect, the pressing die 42 is clamped. It is also possible to adopt a method in which the initial cross-sectional shape 40 ′ before the bulging is formed by pressing.
【００４５】この方法によれば、比較的容易に、バルジ
加工前の初期断面形状となるように、筒状部材４０の成
形を行なうことができる。According to this method, the cylindrical member 40 can be formed relatively easily so as to have the initial cross-sectional shape before the bulge processing.
【図１】 本発明に係る車体構造用筒状部材の製造方法
による第１実施例においてのバルジ加工工程での断面形
状の変形プロセスを示すものであり、（ａ）は加工前の
初期断面形状をなす筒状部材をバルジ金型内に配置した
状態、（ｂ）は筒状部材の内部に圧力を加えたバルジ加
工中の状態、（ｃ）はバルジ加工を終了して最終断面形
状に成形された状態をそれぞれ示す断面図である。FIGS. 1A and 1B show a deformation process of a cross-sectional shape in a bulging step in a first embodiment by a method of manufacturing a tubular member for a vehicle body structure according to the present invention, wherein FIG. (B) is a state in which bulging is performed by applying pressure to the inside of the cylindrical member, and (c) is a state in which the bulging is completed to form a final cross-sectional shape. It is sectional drawing which shows the state each performed.
【図２】 本発明に係る車体構造用筒状部材の製造方法
による第１実施例においてのバルジ加工前の初期断面形
状の限界値を示す図である。FIG. 2 is a diagram showing a limit value of an initial cross-sectional shape before bulging in a first embodiment by a method of manufacturing a tubular member for a vehicle body structure according to the present invention.
【図３】 本発明に係る車体構造用筒状部材の製造方法
による第２実施例においてのバルジ加工前の初期断面形
状とその押圧加工工程を示す断面図である。FIG. 3 is a cross-sectional view showing an initial cross-sectional shape before a bulging process and a pressing process thereof in a second embodiment of the method for manufacturing a tubular member for a vehicle body structure according to the present invention.
【図４】 本発明に係る車体構造用筒状部材の製造方法
による第３実施例においてのバルジ加工前の初期断面形
状と分割型の押圧成形芯金による押圧加工工程を示す断
面図である。FIG. 4 is a cross-sectional view illustrating an initial cross-sectional shape before bulging and a pressing step using a split-type press-molded core in a third embodiment of the method for manufacturing a tubular member for vehicle body structure according to the present invention.
【図５】 本発明に係る車体構造用筒状部材の製造方法
による第３実施例においてのバルジ加工前の初期断面形
状と液圧を作用させながらの押圧加工工程を示す断面図
である。FIG. 5 is a cross-sectional view showing an initial cross-sectional shape before bulging and a press working step while applying hydraulic pressure in a third embodiment according to the method for manufacturing a tubular member for vehicle body structure according to the present invention.
【図６】 従来の車体構造用筒状部材の製造方法を示す
ものであり、（ａ）〜（ｄ）は各々の製造工程を示す図
である。6 (a) to 6 (d) are views showing a conventional method for manufacturing a tubular member for a vehicle body structure, and showing respective manufacturing steps.
【図７】 従来の車体構造用筒状部材の製造方法におい
てのバルジ工程での内圧による断面形状の変形プロセス
を示すものであり、（ａ）は加工前の初期断面形状をな
す筒状部材をバルジ金型内に配置した状態、（ｂ）は筒
状部材の内部に圧力を加えたバルジ加工中の状態、
（ｃ）はバルジ加工を終了して最終断面形状に成形され
た状態をそれぞれ示す断面図である。7A and 7B show a process of deforming a cross-sectional shape due to an internal pressure in a bulge process in a conventional method of manufacturing a cylindrical member for a vehicle body structure, and FIG. 7A shows a cylindrical member having an initial cross-sectional shape before processing. (B) is a state in which bulge processing is performed by applying pressure to the inside of the tubular member,
(C) is sectional drawing which shows the state each formed into the final cross-sectional shape after bulge processing was completed.
２０ 筒状部材 ２０´ 初期断面形状 ２０´´ 最終断面形状 ２０ａ，２０ｂ 湾曲面 ２１ バルジ金型 ２１ａ 下型 ２１ｂ 上型 ３０ 筒状部材 ３０´ 初期断面形状 ３０ａ，３０ｂ 湾曲面 ３１ 押圧成形芯金 ３２ 押圧金型 ４０ 筒状部材 ４０´ 初期断面形状 ４０ａ，４０ｂ 湾曲面 ４１（４１ａ，４１ｂ） 押圧成形芯金 ４２ 押圧金型 Reference Signs List 20 cylindrical member 20 ′ initial cross-sectional shape 20 ″ final cross-sectional shape 20a, 20b curved surface 21 bulge mold 21a lower die 21b upper die 30 cylindrical member 30 ′ initial cross-sectional shape 30a, 30b curved surface 31 press-formed core metal 32 Pressing die 40 Cylindrical member 40 'Initial cross-sectional shape 40a, 40b Curved surface 41 (41a, 41b) Press forming core 42 Pressing die
Claims (7)
の後少なくとも、略矩形形状をなす最終断面形状の外輪
郭を画定するバルジ金型内に前記筒状部材を保持した状
態で前記筒状部材の内部に圧力を加えてバルジ加工を行
ない、前記バルジ加工を行なう前の初期断面形状を略矩
形形状をなす前記最終断面形状に成形する車体構造用筒
状部材の製造方法であって、 前記初期断面形状の角半径及び断面周長を前記最終断面
形状の角半径及び断面周長に略同一にし、かつ、前記初
期断面形状の縦横寸法を前記最終断面形状の縦横寸法よ
りも小さくした状態で、前記バルジ加工を行なう、こと
を特徴とする車体構造用筒状部材の製造方法。1. A cylindrical member having a closed cross-sectional shape is formed, and then the cylindrical member is held at least in a bulge mold defining an outer contour of a final cross-sectional shape having a substantially rectangular shape. A method for producing a tubular member for a vehicle body structure, in which bulging is performed by applying pressure to the inside of a shaped member, and the initial cross-sectional shape before performing the bulging is formed into the final cross-sectional shape having a substantially rectangular shape, A state in which the angular radius and the cross-sectional circumference of the initial cross-sectional shape are substantially the same as the angular radius and the cross-sectional circumferential length of the final cross-sectional shape, and the vertical and horizontal dimensions of the initial cross-sectional shape are smaller than the vertical and horizontal dimensions of the final cross-sectional shape. And performing the bulging process.
辺が内側に凹状となるように湾曲するように前記初期断
面形状を成形した状態で、前記バルジ加工を行なう、 ことを特徴とする請求項１記載の車体構造用筒状部材の
製造方法。2. The bulging process is performed in a state where the initial cross-sectional shape is formed so that a side that becomes substantially flat in the final cross-sectional shape is curved inwardly to be concave. 2. A method for manufacturing a tubular member for a vehicle body structure according to claim 1.
ｂ、高さをｈとし、バルジ加工後の前記最終断面形状の
幅をＢ、高さをＨとするとき、 ０．８×Ｂ≦ｂ≦０．９５×Ｂ ｈ＝（Ｈ×ｂ）／Ｂ を満足するように前記初期断面形状を成形した状態で、
前記バルジ加工を行なう、 ことを特徴とする請求項１又は２記載の車体構造用筒状
部材の製造方法。3. When the width of the initial cross-sectional shape before bulging is b and the height is h, and the width of the final cross-sectional shape after bulging is B and the height is H, 0.8 × B ≦ b ≦ 0.95 × B h = (H × b) / B With the initial cross-sectional shape formed so as to satisfy:
The method according to claim 1 or 2, wherein the bulging is performed.
出し加工により成形し、続いて、前記押し出し加工によ
り得られた筒状部材に曲げ加工を施し、その後、前記バ
ルジ加工を行なう、 ことを特徴とする請求項１ないし３いずれか１つに記載
の車体構造用筒状部材の製造方法。4. A cylindrical member having the initial cross-sectional shape is formed by extrusion, subsequently, the cylindrical member obtained by the extrusion is subjected to a bending process, and thereafter, the bulging process is performed. The method for manufacturing a tubular member for a vehicle body structure according to any one of claims 1 to 3, wherein:
し出し加工により成形し、続いて、前記略円環状の断面
形状が前記初期断面形状となるように前記筒状部材を押
圧加工により成形し、さらに続いて、前記初期断面形状
に成形された筒状部材に曲げ加工を施し、その後、前記
バルジ加工を行なう、 ことを特徴とする請求項１ないし３いずれか１つに記載
の車体構造用筒状部材の製造方法。5. A cylindrical member having a substantially annular cross-sectional shape is formed by extrusion, and subsequently, the cylindrical member is pressed by a pressing process such that the substantially circular cross-sectional shape becomes the initial cross-sectional shape. The vehicle body according to any one of claims 1 to 3, wherein the body is formed, and subsequently, the cylindrical member formed into the initial cross-sectional shape is subjected to a bending process, and thereafter, the bulging process is performed. A method for manufacturing a structural tubular member.
し出し加工により成形し、続いて、前記筒状部材に曲げ
加工を施し、さらに続いて、前記略円環状の断面形状が
前記初期断面形状となるように前記筒状部材を押圧加工
により成形し、その後、前記バルジ加工を行なう、 ことを特徴とする請求項１ないし３いずれか１つに記載
の車体構造用筒状部材の製造方法。6. A cylindrical member having a substantially annular cross-sectional shape is formed by extrusion, and subsequently, the cylindrical member is subjected to a bending process. The manufacturing of the cylindrical member for a vehicle body structure according to any one of claims 1 to 3, wherein the cylindrical member is formed by press working so as to have a cross-sectional shape, and thereafter, the bulging is performed. Method.
材の内部に圧力を加えながら行なう、ことを特徴とする
請求項６記載の車体構造用筒状部材の製造方法。7. The method according to claim 6, wherein the pressing is performed while applying pressure to the inside of the cylindrical member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10143297A JPH11333526A (en) | 1998-05-25 | 1998-05-25 | Manufacture of cylindrical member for vehicle body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10143297A JPH11333526A (en) | 1998-05-25 | 1998-05-25 | Manufacture of cylindrical member for vehicle body structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11333526A true JPH11333526A (en) | 1999-12-07 |
Family
ID=15335478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10143297A Pending JPH11333526A (en) | 1998-05-25 | 1998-05-25 | Manufacture of cylindrical member for vehicle body structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11333526A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002263747A (en) * | 2001-03-06 | 2002-09-17 | Honda Motor Co Ltd | Tubular member manufacturing method |
| JP2005000978A (en) * | 2003-06-13 | 2005-01-06 | Nissan Motor Co Ltd | Hydraulic forming method and metallic plate for hydraulic forming |
| JP2005238254A (en) * | 2004-02-24 | 2005-09-08 | Nissan Motor Co Ltd | Aluminum extruded material for hydroforming, and hydroforming method for the same |
| JP2006026646A (en) * | 2004-07-12 | 2006-02-02 | Nissan Motor Co Ltd | Method and apparatus for hydraulic forming |
| JP4564140B2 (en) * | 2000-07-14 | 2010-10-20 | 新日本製鐵株式会社 | Hydroform processing method |
| JP2011031265A (en) * | 2009-07-31 | 2011-02-17 | Honda Motor Co Ltd | Apparatus and method of hot bulge forming, and product formed by hot bulge forming |
| JP2013107091A (en) * | 2011-11-17 | 2013-06-06 | Kobe Steel Ltd | Electromagnetic forming method of polygonal cross-sectional member |
| US9327664B2 (en) | 2012-02-01 | 2016-05-03 | Kobe Steel, Ltd. | Energy absorbing member, method for producing same, and electromagnetic tube expansion method for rectangular cross-section member and polygon cross-section member |
| CN107243538A (en) * | 2017-08-08 | 2017-10-13 | 天津天锻航空科技有限公司 | A kind of method that big girth rectangle is shaped by Xiao Zhou's Circular Pipe |
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1998
- 1998-05-25 JP JP10143297A patent/JPH11333526A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4564140B2 (en) * | 2000-07-14 | 2010-10-20 | 新日本製鐵株式会社 | Hydroform processing method |
| JP2002263747A (en) * | 2001-03-06 | 2002-09-17 | Honda Motor Co Ltd | Tubular member manufacturing method |
| JP2005000978A (en) * | 2003-06-13 | 2005-01-06 | Nissan Motor Co Ltd | Hydraulic forming method and metallic plate for hydraulic forming |
| JP2005238254A (en) * | 2004-02-24 | 2005-09-08 | Nissan Motor Co Ltd | Aluminum extruded material for hydroforming, and hydroforming method for the same |
| JP2006026646A (en) * | 2004-07-12 | 2006-02-02 | Nissan Motor Co Ltd | Method and apparatus for hydraulic forming |
| JP2011031265A (en) * | 2009-07-31 | 2011-02-17 | Honda Motor Co Ltd | Apparatus and method of hot bulge forming, and product formed by hot bulge forming |
| JP2013107091A (en) * | 2011-11-17 | 2013-06-06 | Kobe Steel Ltd | Electromagnetic forming method of polygonal cross-sectional member |
| US9327664B2 (en) | 2012-02-01 | 2016-05-03 | Kobe Steel, Ltd. | Energy absorbing member, method for producing same, and electromagnetic tube expansion method for rectangular cross-section member and polygon cross-section member |
| US10926313B2 (en) | 2015-06-02 | 2021-02-23 | Sumitomo Heavy Industries, Ltd. | Forming apparatus |
| CN107243538A (en) * | 2017-08-08 | 2017-10-13 | 天津天锻航空科技有限公司 | A kind of method that big girth rectangle is shaped by Xiao Zhou's Circular Pipe |
| CN113102598A (en) * | 2021-04-09 | 2021-07-13 | 哈尔滨工业大学 | Liquid-filling pressing forming device and method for special-shaped section pipe fitting |
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