JPH10192965A - Manufacture of cylindrical member for vehicle body structure - Google Patents
Manufacture of cylindrical member for vehicle body structureInfo
- Publication number
- JPH10192965A JPH10192965A JP1476597A JP1476597A JPH10192965A JP H10192965 A JPH10192965 A JP H10192965A JP 1476597 A JP1476597 A JP 1476597A JP 1476597 A JP1476597 A JP 1476597A JP H10192965 A JPH10192965 A JP H10192965A
- Authority
- JP
- Japan
- Prior art keywords
- flange
- cylindrical member
- bent
- bending
- vehicle body
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/08—Making wire, bars, tubes
- B21C23/12—Extruding bent tubes or rods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/155—Making tubes with non circular section
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
- Body Structure For Vehicles (AREA)
- Extrusion Of Metal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、湾曲部分を有する
車体構造用筒状部材の製造方法に係り、さらに詳しく
は、湾曲度を大きく取ることができ、かつ、筒状部材の
曲げ加工部分にフランジの割れや亀裂が発生するのを防
止する車体構造用筒状部材の製造方法に関するものであ
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 having a curved portion, and more particularly, to a method for manufacturing a tubular member having a large degree of curvature and having a bent portion. The present invention relates to a method for manufacturing a tubular member for a vehicle body structure that prevents the occurrence of cracks and cracks in a flange.
【０００２】[0002]
【従来の技術】従来、自動車の車体は、鋼板にプレス成
形加工を施したり、押し出し成形した鋼管を折り曲げ加
工して得られた様々な形状の車体部材を組み合わせ、ス
ポット溶接等を用いて各車体部材を接合し一体化するこ
とにより製造されているが、近年、車体のより軽量化を
図るために、鋼板の替わりにアルミニウム合金やチタン
合金等の軽合金を使用することが検討されている。例え
ば、車体前方のエンジンルーム下部から後方に向かって
延び客室前方フロアの構造部材に接続されるフロントサ
イドフレームメンバー、客室後方フロアの構造部材から
後方に延びトランクルーム下部に達するリヤサイドフレ
ームメンバー等の構造部材は、その長手方向の全長にわ
たってほぼ一定の断面形状の筒状部材とする必要があ
る。2. Description of the Related Art Conventionally, a vehicle body is formed by subjecting a steel sheet to press forming or bending an extruded steel pipe to combine various shaped body members, and using spot welding or the like to combine the various body members. Although it is manufactured by joining and integrating members, in recent years, use of a light alloy such as an aluminum alloy or a titanium alloy instead of a steel plate has been studied in order to achieve a lighter vehicle body. For example, structural members such as a front side frame member extending rearward from a lower portion of an engine room in front of a vehicle body and connected to structural members on a front floor of a passenger compartment, and a rear side frame member extending rearward from a structural member on a rear floor of a passenger compartment and reaching a lower portion of a trunk room. Needs to be a cylindrical member having a substantially constant cross-sectional shape over the entire length in the longitudinal direction.
【０００３】図５は、従来の曲げ加工が施される直線状
の筒状部材を示す斜視図である。図５において、符号１
はアルミ材を押出成形した長尺の筒状部材であり、肉厚
一定の矩形状の断面を有する中空の筒部２と、当該筒部
２の外側の一側面２ａに長手方向に沿って一体に立設さ
れた肉厚一定のフランジ３とから構成されている。FIG. 5 is a perspective view showing a conventional linear tubular member subjected to bending. In FIG.
Is a long cylindrical member formed by extruding an aluminum material, and is integrally formed with a hollow cylindrical portion 2 having a rectangular cross section with a constant thickness and one side surface 2a outside the cylindrical portion 2 along the longitudinal direction. And a flange 3 having a constant thickness.
【０００４】この筒状部材１に所定形状、例えば、図６
に示すようにフランジ３が外向きに凸とされる曲げ加工
を施すには、曲げ加工用プレスの上下金型間にフランジ
３が外向きになるように筒状部材１を装填し、把持具等
を用いて当該筒状部材１の両端部を挟持し、当該筒状部
材１の断面形状が変形しないように筒部２の内部に図示
しない中子を挿通する。そして、上記把持具等により当
該筒状部材１の長手方向に引張力を付与しながら上記上
金型をゆっくり下降させ、フランジ３が外向きに凸にな
るように当該筒部２及びフランジ３の曲げ加工すべき部
分３ａを湾曲させる。このようにして、フランジ３が外
側になるように湾曲させた筒状部材１１が得られる。The cylindrical member 1 has a predetermined shape, for example, as shown in FIG.
In order to perform the bending process in which the flange 3 is outwardly protruded as shown in (1), the tubular member 1 is loaded between the upper and lower dies of the bending press so that the flange 3 is directed outward, and a gripper is provided. By sandwiching both ends of the tubular member 1 by using, for example, a core (not shown) is inserted into the tubular portion 2 so that the cross-sectional shape of the tubular member 1 is not deformed. Then, the upper die is slowly lowered while applying a tensile force in the longitudinal direction of the cylindrical member 1 by the gripping tool or the like, and the cylindrical portion 2 and the flange 3 are moved outward so that the flange 3 becomes outwardly convex. The portion 3a to be bent is curved. In this way, the cylindrical member 11 curved so that the flange 3 is on the outside is obtained.
【０００５】[0005]
【発明が解決しようとする課題】ところで、このように
して形成された筒状部材１１にあっては、上記曲げ加工
時に曲げの外側にあるフランジ３に引張力が生じ、曲げ
加工すべき部分３ａが長手方向へ引き伸ばされるため、
当該フランジ３が曲げ加工により発生する引張強度に耐
えられなくなり、例えば、図７に示すように、当該曲げ
加工部分３ａに引張応力に起因する中空部に達する割れ
４や亀裂等が発生するという問題点があった。その理由
は、フランジ３の曲げ加工すべき部分３ａは、外側にな
ればなる程引張応力が高くなり、この引張応力に応じて
材料も引き伸ばされるが、フランジ３の側部は端部の拘
束が無いことにより破断の発生点になるためである。Incidentally, in the tubular member 11 formed in this manner, a tensile force is generated in the flange 3 outside the bend during the above-mentioned bending, and a portion 3a to be bent is formed. Is stretched in the longitudinal direction,
The flange 3 cannot withstand the tensile strength generated by the bending, and for example, as shown in FIG. 7, a crack 4 or a crack reaching the hollow portion due to the tensile stress occurs in the bent portion 3 a. There was a point. The reason for this is that, as the portion 3a of the flange 3 to be bent becomes more outward, the tensile stress becomes higher, and the material is stretched in accordance with this tensile stress. This is because the absence of the material serves as a breaking point.
【０００６】そこで、このフランジ３に曲率半径の小さ
な曲げ加工を行なおうとすると、曲げ加工部分３ａに割
れ４や亀裂が生じ易くなるので、この曲げ加工部分３ａ
の曲げ加工度を小さくするしかなく、上記フランジ３に
曲率半径の小さな曲げ加工を施すことが困難であった。Therefore, if the flange 3 is to be bent with a small radius of curvature, a crack 4 or a crack is likely to occur in the bent portion 3a.
It is only possible to reduce the degree of bending, and it is difficult to perform bending with a small radius of curvature on the flange 3.
【０００７】本発明は上記の事情に鑑みてなされたもの
であって、工数の増加を極力抑えながら、フランジの曲
げ加工すベき部分に割れや亀裂等が発生することがな
く、しかも、曲率半径の小さな曲げ加工を施すことがで
きる車体構造用筒状部材の製造方法を提供することを目
的とするものである。[0007] The present invention has been made in view of the above circumstances, and while minimizing the increase in man-hours, there is no occurrence of cracks or cracks in the portion of the flange to be bent, and the curvature is reduced. An object of the present invention is to provide a method of manufacturing a tubular member for a vehicle body structure that can be bent with a small radius.
【０００８】[0008]
【課題を解決するための手段】請求項１に記載の本発明
に係る車体構造用筒状部材の製造方法は、略多角形状の
断面を有し、かつその外側にフランジが一体に設けら
れ、さらに上記フランジが外側となるように湾曲された
車体構造用筒状部材を製造するに際して、上記筒状部材
の外形形状を有する押出成形孔と、この押出成形孔の上
記フランジを形成する部分に進退自在に設けられた可動
ダイスと、上記押出成形孔内に挿入されたマンドレルと
を有する押出成形装置を用いて、上記略多角形状の断面
を有し、かつ、その外側にフランジが一体に設けられた
直線状の筒状部材を押出成形しつつ、フランジの押出成
形孔部分の断面形状を可動ダイスによって変化させるこ
とにより、フランジの曲げ加工すべき部分に当該フラン
ジを形成しないフランジ切欠き部が形成された筒状部材
を押出成形する第１工程と、当該第１工程で得た筒状部
材を、フランジが外側となるようにフランジ切欠き部分
において曲げ加工する第２工程とを有してなることを特
徴とするものである。According to a first aspect of the present invention, there is provided a method for manufacturing a tubular member for a vehicle body structure, wherein the cylindrical member has a substantially polygonal cross section, and a flange is integrally provided outside the cross section. Further, when manufacturing a cylindrical member for a vehicle body structure in which the flange is curved outward, the extruded hole having the outer shape of the cylindrical member and a portion of the extruded hole which forms the flange are retreated. Using an extruder having a movable die freely provided and a mandrel inserted into the extruded hole, the cross-section has a substantially polygonal shape, and a flange is integrally provided on the outside thereof. By extruding the straight cylindrical member, and changing the cross-sectional shape of the extruded hole of the flange with a movable die, a flange that does not form the flange at the portion of the flange to be bent is formed. A first step of extruding the cylindrical member having the notch formed therein, and a second step of bending the cylindrical member obtained in the first step at the flange notch so that the flange is on the outside. And characterized in that:
【０００９】ここで、請求項２に記載の発明は、上記マ
ンドレルをテーパー状に形成し、このマンドレルを進退
させることにより、上記フランジ切欠き部を肉厚に成形
することを特徴とするものである。さらに、請求項３に
記載の発明は、請求項１または２に記載の第１工程を実
施する押出成形装置の下流側に、上記第２工程を実施す
るロールベンド装置を配設し、上記押出成形装置より押
出された直線状の筒状部材を、連続的にロールベンド装
置に送給して曲げ加工することを特徴とするものであ
る。Here, the invention according to claim 2 is characterized in that the mandrel is formed in a tapered shape, and the flange notch is formed thick by moving the mandrel forward and backward. is there. Further, according to a third aspect of the present invention, a roll bending apparatus for performing the second step is disposed downstream of the extrusion molding apparatus for performing the first step according to the first or second aspect. A straight cylindrical member extruded from a forming device is continuously fed to a roll bend device and bent.
【００１０】請求項１〜３のいずれかに記載の発明によ
れば、第１工程の押出成形の段階で、予めフランジの曲
げ加工すべき部分を切欠いた形に筒状部材を押出成形す
るので、一旦押出成形した後で、切削や溶断等によって
フランジの一部を切欠く加工を施す必要がない。従っ
て、上記筒状部材の製造に要する工程数を減らすことが
できると共に、切欠部分に、曲げ加工時に悪作用を及ぼ
すような無用な影響が残りにくく、曲げ加工の品質を高
めることができる。また、予め曲げ加工する前に、フラ
ンジの曲げ加工すべき部分を切欠いているので、曲げ加
工した際に、このフランジに割れが発生するおそれがな
くなり、フランジの曲率半径が小さくなる。よって、曲
率半径のより小さな筒状部材を得ることができる。According to the invention described in any one of the first to third aspects, in the extrusion step of the first step, the cylindrical member is extruded in a shape in which a portion of the flange to be bent is cut out in advance. There is no need to cut out a part of the flange by cutting, fusing, or the like after extrusion molding. Therefore, it is possible to reduce the number of steps required for manufacturing the cylindrical member, and it is difficult for unnecessary effects such as adverse effects at the time of bending to remain in the notched portion, thereby improving the quality of bending. In addition, since a portion of the flange to be bent is cut out before bending, the flange is less likely to crack when bent, and the radius of curvature of the flange is reduced. Therefore, a cylindrical member having a smaller radius of curvature can be obtained.
【００１１】ところで、このようにして得られた筒状部
材にあっては、曲げ加工が行われる部分にフランジ切欠
き部が形成されているので、使用される部位によって
は、当該切欠き部における強度が不足する場合がある。
この点、請求項２に記載の発明によれば、テーパー状に
形成されたマンドレルを進退させて、上記フランジ切欠
き部を肉厚に成形することにより、このような曲げ加工
される部位における強度不足を生じることが回避され
る。さらに、請求項３に記載の発明によれば、押出成形
装置の下流側に配したロールベンド装置で押出成形品を
連続曲げ加工するので、加工設備の場所をとらずに、作
業性よく最終製品である筒状部材を得ることができる。By the way, in the cylindrical member obtained as described above, since a flange notch is formed in a portion where bending is performed, depending on a part to be used, the notch in the notch may be changed. The strength may be insufficient.
In this regard, according to the second aspect of the present invention, the mandrel formed in a tapered shape is advanced and retracted, and the flange notch is formed to have a large thickness, so that the strength at such a bent portion is obtained. Shortages are avoided. Furthermore, according to the third aspect of the present invention, since the extruded product is continuously bent by the roll bending device disposed downstream of the extrusion device, the final product can be easily operated without taking up space for the processing equipment. Can be obtained.
【００１２】[0012]
【発明の実施の形態】図１は、本発明に係る車体構造用
筒状部材の製造方法の実施形態に用いる加工設備の概要
を示す構成図であり、図２は同設備で使用している押出
用ダイスの正面図、図３および図４はそれぞれ各工程ご
との成形品の形状を示す斜視図である。図１に示すよう
に、この加工設備は、押出成形装置５０と、その下流側
に配置されたロールベンド装置６０とから概略構成され
たものである。ここで、押出成形装置５０は、図３に示
す形状の筒状部材２１を加工し、ロールベンド装置６０
は、押出成形装置５０から出てきた上記筒状部材２１に
曲げ加工を施して、図４に示す形状の筒状部材３１を得
るものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a configuration diagram showing an outline of processing equipment used in an embodiment of a method for manufacturing a tubular member for a vehicle body structure according to the present invention, and FIG. 2 is used in the same equipment. FIGS. 3 and 4 are front views of the extrusion dies, and FIGS. 3 and 4 are perspective views showing the shape of the molded product in each step. As shown in FIG. 1, this processing equipment is schematically constituted by an extrusion molding device 50 and a roll bend device 60 arranged downstream thereof. Here, the extrusion molding device 50 processes the cylindrical member 21 having the shape shown in FIG.
Is to perform a bending process on the tubular member 21 coming out of the extrusion molding device 50 to obtain a tubular member 31 having a shape shown in FIG.
【００１３】上記押出成形装置５０は、コンテナ５１
と、押出用ダイス５２と、ステム５３と、押盤５４と、
ステム５３側に配されたマンドレル５５とを有する。ロ
ールベンド装置６０は、加工素材である筒状部材２１の
外径を拘束する複数の曲げロール６１を有し、押出成形
装置５０から出てきた筒状部材２１を、それら曲げロー
ル６１間に通過させることで曲げ加工するものである。The extruder 50 includes a container 51.
, An extrusion die 52, a stem 53, a pressing plate 54,
A mandrel 55 disposed on the stem 53 side. The roll bending device 60 has a plurality of bending rolls 61 for restraining the outer diameter of the cylindrical member 21 as a processing material, and passes the cylindrical member 21 coming out of the extrusion molding device 50 between the bending rolls 61. This is done by bending.
【００１４】上記押出成形装置５０の押出用ダイス５２
は、図２に示すように、固定ダイス５２Ａと、可動ダイ
ス５２Ｂとからなるものであり、押出用ダイス５２は、
マンドレル５５との間に所定断面形状の押出成形孔５８
を形成するものである。この場合の押出成形孔５８は、
図３に示す筒状部材２１の筒部２を形成する部分５８ａ
と、フランジ３を形成する部分５８ｂとから構成されて
いる。また、上記可動ダイス５２Ｂは、押出成形孔５８
のフランジ３を形成する部分５８ｂに、外側から挿入さ
れており、フランジ３の幅を調整する方向（図中矢印Ｓ
方向）にスライド自在に設けられ、駆動機構５９によっ
てその位置が、押出成形の任意の時点で調整できるよう
になっている。さらに、マンドレル５５は、上記押出成
形孔５８にのぞむ部分が、先端側に向けて漸次縮径する
テーパー状に形成されている。The extrusion die 52 of the extrusion molding apparatus 50
Is composed of a fixed die 52A and a movable die 52B, as shown in FIG.
Extrusion molding hole 58 having a predetermined cross-sectional shape between mandrel 55
Is formed. The extruded hole 58 in this case is
Portion 58a that forms cylindrical portion 2 of cylindrical member 21 shown in FIG.
And a portion 58b forming the flange 3. In addition, the movable die 52B is provided with an extrusion hole 58.
Is inserted from the outside into a portion 58b forming the flange 3 of the direction of FIG.
Direction), and its position can be adjusted at any time during extrusion by a drive mechanism 59. Further, the mandrel 55 is formed in a tapered shape in which a portion looking into the extrusion hole 58 gradually decreases in diameter toward the distal end side.
【００１５】次に、以上の構成からなる押出成形装置を
用いた筒状部材の製造方法について説明する。先ず加工
の第１工程としては、押出成形装置５０により、図３に
示す筒状部材２１を押出成形する。すなわち、図１に示
す押出成形装置５０のコンテナ５１内に加熱した成形材
（ビレット）５６を挿入すると共に、このビレット５６
を、ステム５３によって押出用ダイス５２側に押圧し
て、押出成形孔５８（図２参照）から押出すことによ
り、押出成形孔５８の断面形状を有する棒状の筒状部材
２１を得る。Next, a method for manufacturing a tubular member using the extrusion molding apparatus having the above-described configuration will be described. First, as a first step of the processing, the tubular member 21 shown in FIG. That is, the heated molding material (billet) 56 is inserted into the container 51 of the extrusion molding apparatus 50 shown in FIG.
Is pressed toward the extrusion die 52 by the stem 53 and is extruded from the extrusion hole 58 (see FIG. 2), whereby the rod-shaped tubular member 21 having the cross-sectional shape of the extrusion hole 58 is obtained.
【００１６】この筒状部材２１は、略多角形状の断面を
有し、かつ、その外側にフランジ３が一体に設けられた
ものである。しかも、この第１工程の際に、図２に示し
た可動ダイス５２Ｂの位置を調節することにより、押出
成形孔５８のフランジ３を形成する部分５８ｂの断面寸
法を変化させながら押出成形を行い、それにより、フラ
ンジ３の曲げ加工すべき部分３ａを切欠いた形の筒状部
材２１を得る。なお、フランジ３を切欠いた部分は、そ
れだけ強度が落ちる可能性があるので、その部分の押出
成形の際に、マンドレル５５を後退させることにより、
筒部２の肉厚を厚めに加工して、強度低下を抑えること
もできる。なお、この場合の肉厚の増加は、筒部２の全
体に行ってもよいし、フランジ３側の壁のみに行っても
よい。The cylindrical member 21 has a substantially polygonal cross section, and the flange 3 is integrally provided on the outside thereof. In addition, during the first step, extrusion is performed by adjusting the position of the movable die 52B shown in FIG. 2 while changing the cross-sectional dimension of the portion 58b of the extrusion hole 58 where the flange 3 is formed. As a result, a cylindrical member 21 in which the portion 3a of the flange 3 to be bent is cut out is obtained. Since the strength of the part where the flange 3 is notched may be reduced, the mandrel 55 is retracted during the extrusion of the part.
The wall thickness of the cylindrical portion 2 can be made thicker to suppress a decrease in strength. In this case, the increase in the wall thickness may be performed on the entire cylindrical portion 2 or only on the wall on the flange 3 side.
【００１７】次いで、第２工程として、押出成形された
筒状部材２１を、そのままロールベンド装置６０に送り
込み、このロールベンド装置６０によって、第１工程で
得た筒状部材２１を、フランジ３が外側となるように曲
げ加工し、図４の筒状部材３１を得る。ここでは、予
め、フランジ３の曲げ加工すべき部分３ａが切欠かれて
いるので、フランジ３が外側になるように曲げ加工した
場合、フランジ３に引張応力に起因する割れや亀裂が生
じるおそれがなく、筒状部材２１に曲率半径の小さな曲
げ加工を施すことができる。Next, as a second step, the extruded tubular member 21 is fed to a roll bend device 60 as it is, and the cylindrical member 21 obtained in the first process is separated from the flange 3 by the roll bend device 60. It is bent so as to be on the outside, and the cylindrical member 31 of FIG. 4 is obtained. Here, since the portion 3a of the flange 3 to be bent is cut out in advance, when the flange 3 is bent so that the flange 3 is on the outside, there is no possibility that the flange 3 is cracked or cracked due to tensile stress. In addition, the cylindrical member 21 can be bent with a small radius of curvature.
【００１８】したがって、この製造方法によれば、第１
工程の押出成形の段階で、フランジ３の曲げ加工すべき
部分３ａを切欠いた形に筒状部材２１を押出成形するの
で、一旦押出成形した後で、切削や溶断等によってフラ
ンジ３の一部を切欠く加工をする必要がなく、工程数を
増やすことがない。また、切削や溶断等の後加工によっ
て切欠くのではないから、切欠部分に、曲げ加工時に悪
作用を及ぼすような影響が残りにくく、曲げ加工の品質
向上も図れる。また、押出成形装置５０の下流側に配し
たロールベンド装置６０で押出成形品を連続曲げ加工す
るから、加工設備の場所をとらずに、作業性よく最終製
品である筒状部材３１を得ることができ、曲げ加工の段
取り等の煩わしさもない。よって、加工工程は第１、第
２の２工程あるものの、一貫した自動作業が可能で、製
造効率の向上が図れる。さらに、テーパー状に形成され
たマンドレル５５を進退させて、上記フランジ３が切り
欠かれた部分３ａを肉厚に成形すれば、当該部分３ａに
おいて強度不足を生じることがない。Therefore, according to this manufacturing method, the first
In the extrusion forming step of the process, the cylindrical member 21 is extruded in a shape in which the portion 3a of the flange 3 to be bent is cut out, so that after extrusion, a part of the flange 3 is cut or melted. There is no need to perform notch processing, and there is no increase in the number of steps. In addition, since notches are not formed by post-processing such as cutting and fusing, an effect that adversely affects bending is hardly left in the notched portion, and the quality of bending can be improved. Further, since the extruded product is continuously bent by the roll bending device 60 disposed downstream of the extruding device 50, it is possible to obtain the cylindrical member 31 which is the final product with good workability without taking up space for the processing equipment. And no hassle in setting up the bending process. Therefore, although there are two processing steps, the first and second processing steps, a consistent automatic operation is possible and the production efficiency can be improved. Furthermore, if the tapered mandrel 55 is advanced and retracted to form the thickened portion 3a where the flange 3 is cut off, insufficient strength is not generated in the portion 3a.
【００１９】なお、上記実施の形態においては、第２の
工程を行う曲げ加工手段としてロールベンド法を用いた
場合について説明したが、これに限定されるものではな
く、ロールベンド法のように一貫した自動作業はできな
くなる可能性はあるが、曲げ加工を他の手段によって行
ってもよい。すなわち、上記第２の工程は、例えば、曲
げ加工として一般的に知られている回転引き曲げ法（ド
ローベンド法）、押し付け曲げ法（圧縮曲げ法）、引張
り曲げ法（ストレッチ曲げ法）等を採用することができ
る。ここで、回転引き曲げ法とは、回転曲げ型に締め付
け型で加工素材を押し付け、そのまま回転曲げ型を回転
させることによって、回転曲げ型の半径に沿った形状に
加工素材を曲げる加工法である。また、押し付け曲げ法
とは、回転する押し型で加工素材を固定曲げ型に押し付
けて曲げる加工法である。さらに、引張り曲げ法とは、
加工素材に引張力を付加した状態で曲げ型を押し付けて
曲げる加工法である。In the above embodiment, the case where the roll bending method is used as the bending means for performing the second step has been described. However, the present invention is not limited to this. Although there is a possibility that the automatic operation cannot be performed, the bending may be performed by other means. That is, the second step employs, for example, a rotary bending method (draw bending method), a press bending method (compression bending method), a tension bending method (stretch bending method), and the like, which are generally known as bending. can do. Here, the rotary pull bending method is a processing method in which a processing material is pressed against a rotary bending die with a clamping die, and the rotary bending die is rotated as it is, thereby bending the processing raw material into a shape along the radius of the rotary bending die. . The pressing bending method is a processing method in which a work material is pressed against a fixed bending die with a rotating pressing die and bent. Furthermore, the tension bending method
This is a processing method in which a bending die is pressed and bent while a tensile force is applied to a processing material.
【００２０】[0020]
【発明の効果】以上説明したように、請求項１〜３のい
ずれかに記載の本発明に係る製造方法によれば、可動ダ
イスを用いて、第１工程の押出成形の段階で、フランジ
の曲げ加工すべき部分を切欠いた形に筒状部材を押出成
形するので、一旦押出成形した後で、切削や溶断等によ
ってフランジの一部を切欠く加工を施す必要がない。従
って、切欠の後加工の工程を省略できる分、全体の工程
数を減らすことができる。また、切欠部分に、曲げ加工
時に悪作用を及ぼすような無用な影響が残りにくくなる
ため、曲げ加工の品質を高めることもできる。また、予
め、曲げ加工する前に、フランジの曲げ加工すべき部分
を切欠いているので、曲げ加工した際に、このフランジ
に割れが発生するおそれがなくなり、フランジの曲率半
径が小さくなる。よって、曲率半径のより小さな筒状部
材を得ることができる。As described above, according to the manufacturing method of the present invention as set forth in any one of claims 1 to 3, the movable die is used to extrude the flange in the first step of extrusion molding. Since the cylindrical member is extruded in a shape in which a portion to be bent is cut out, it is not necessary to cut out or cut a part of the flange by cutting or fusing after the extrusion. Therefore, the total number of steps can be reduced because the post-processing of the notch can be omitted. In addition, unnecessary effects such as adverse effects at the time of bending are less likely to remain in the notched portions, so that the quality of bending can be improved. In addition, since the portion of the flange to be bent is cut out before bending, the flange is less likely to crack when bent, and the radius of curvature of the flange is reduced. Therefore, a cylindrical member having a smaller radius of curvature can be obtained.
【００２１】また特に、請求項２の発明の製造方法によ
れば、テーパー状に形成されたマンドレルを進退させ
て、上記フランジ切欠き部を肉厚に成形することによ
り、このような曲げ加工される部位において強度不足を
生じることが無く、さらに請求項３に記載の発明によれ
ば、押出成形装置の下流側に配したロールベンド装置で
押出成形品を連続曲げ加工するので、加工設備の場所を
とらずに、作業性よく最終製品である筒状部材を得るこ
とができる。従って、曲げ加工の段取り等の煩わしさも
なく、一貫した自動作業が可能となり、製造効率の向上
が図れるといった効果が得られる。In particular, according to the manufacturing method of the second aspect of the present invention, the tapered mandrel is advanced and retracted to form the flange notch into a large thickness, thereby performing such a bending process. According to the third aspect of the present invention, the extruded product is continuously bent by the roll bend device disposed downstream of the extruding device, so that the location of the processing equipment is not generated. Thus, a tubular member as a final product can be obtained with good workability without taking any steps. Therefore, the automatic operation can be performed consistently without any trouble such as the setup of the bending process, and the effect of improving the production efficiency can be obtained.
【図１】本発明の実施形態の製造方法を実施するための
加工設備の概要を示す構成図である。FIG. 1 is a configuration diagram illustrating an outline of a processing facility for performing a manufacturing method according to an embodiment of the present invention.
【図２】本発明の実施形態の製造方法の第１工程の実施
に用いる押出ダイスの正面図である。FIG. 2 is a front view of an extrusion die used for performing a first step of the manufacturing method according to the embodiment of the present invention.
【図３】本発明の実施形態における曲げ加工すべき車体
構造用筒状部材を示す斜視図である。FIG. 3 is a perspective view showing a tubular member for a vehicle body structure to be bent in the embodiment of the present invention.
【図４】本発明の実施形態における曲げ加工が施された
車体構造用筒状部材を示す斜視図である。FIG. 4 is a perspective view showing a bent body member for a vehicle body structure according to the embodiment of the present invention.
【図５】従来の曲げ加工すべき車体構造用筒状部材を示
す斜視図である。FIG. 5 is a perspective view showing a conventional tubular member for vehicle body structure to be bent.
【図６】従来の曲げ加工された車体構造用筒状部材を示
す斜視図である。FIG. 6 is a perspective view showing a conventional bent tubular member for a vehicle body structure.
【図７】従来の車体構造用筒状部材の不具合の一例を示
す斜視図である。FIG. 7 is a perspective view showing an example of a defect of a conventional tubular member for vehicle body structure.
３ フランジ ３ａ 曲げ加工すべき部分 ２１、３１ 筒状部材 ５０ 押出成形装置 ５２Ｂ 可動ダイス ５８ 押出成形孔 ５８ｂ フランジを形成する部分 ６０ ロールベンド装置 3 Flange 3a Part to be bent 21, 31 Cylindrical member 50 Extrusion molding device 52B Movable die 58 Extrusion molding hole 58b Part forming flange 60 Roll bend device
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｂ６２Ｄ 25/00 Ｂ６２Ｄ 25/00 65/00 65/00 Ａ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code FI B62D 25/00 B62D 25/00 65/00 65/00 A
Claims (3)
側にフランジが一体に設けられ、さらに、上記フランジ
が外側となるように湾曲された車体構造用筒状部材の製
造方法であって、 上記筒状部材の外形形状を有する押出成形孔と、この押
出成形孔の上記フランジを形成する部分に進退自在に設
けられた可動ダイスと、上記押出成形孔内に挿入された
マンドレルとを有する押出成形装置を用いて、 上記略多角形状の断面を有し、かつ、その外側にフラン
ジが一体に設けられた直線状の筒状部材を押出成形しつ
つ、上記フランジの押出成形孔部分の断面形状を可動ダ
イスによって変化させることにより、上記フランジの曲
げ加工すべき部分に当該フランジを形成しないフランジ
切欠き部が形成された上記筒状部材を押出成形する第１
工程と、 当該第１工程で得た筒状部材を、上記フランジが外側と
なるように上記フランジ切欠き部分において曲げ加工す
る第２工程とを有してなることを特徴とする車体構造用
筒状部材の製造方法。1. A method for manufacturing a tubular member for a vehicle body structure having a substantially polygonal cross section, a flange integrally provided outside the cross section, and curved so that the flange is outside. An extrusion molding hole having the outer shape of the cylindrical member, a movable die provided to be able to advance and retreat at a portion of the extrusion molding hole forming the flange, and a mandrel inserted into the extrusion molding hole. Using an extrusion molding device having a cross section of the above-mentioned substantially polygonal shape, and extruding a linear cylindrical member having a flange integrally provided on the outside thereof, the extrusion molding hole portion of the flange is formed. By changing the cross-sectional shape by a movable die, a first member for extruding the cylindrical member having a flange cutout portion not forming the flange in a portion of the flange to be bent is formed.
And a second step of bending the tubular member obtained in the first step at the flange notch so that the flange is located outside. Method for manufacturing a shaped member.
このマンドレルを進退させることにより、上記フランジ
切欠き部を肉厚に成形することを特徴とする請求項１に
記載の車体構造用筒状部材の製造方法。2. The method according to claim 1, wherein the mandrel is formed in a tapered shape.
The method for manufacturing a tubular member for a vehicle body structure according to claim 1, wherein the flange notch is formed to be thick by moving the mandrel forward and backward.
下流側に、上記第２工程を実施するロールベンド装置を
配設し、上記押出成形装置より押出された直線状の筒状
部材を、連続的にロールベンド装置に送給して曲げ加工
することを特徴とする請求項１または２に記載の車体構
造用筒状部材の製造方法。3. A roll bend device for performing the second step is provided downstream of the extrusion device for performing the first step, and a linear cylindrical member extruded from the extrusion device is provided. 3. The method for manufacturing a tubular member for a vehicle body structure according to claim 1, wherein the sheet is continuously fed to a roll bend device and bent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01476597A JP3528492B2 (en) | 1997-01-10 | 1997-01-10 | Method for manufacturing tubular member for vehicle body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP01476597A JP3528492B2 (en) | 1997-01-10 | 1997-01-10 | Method for manufacturing tubular member for vehicle body structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10192965A true JPH10192965A (en) | 1998-07-28 |
| JP3528492B2 JP3528492B2 (en) | 2004-05-17 |
Family
ID=11870181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP01476597A Expired - Fee Related JP3528492B2 (en) | 1997-01-10 | 1997-01-10 | Method for manufacturing tubular member for vehicle body structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3528492B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010046685A (en) * | 2008-08-21 | 2010-03-04 | Kobe Steel Ltd | Roll-bent member and roll bending method |
| JP2015104734A (en) * | 2013-11-28 | 2015-06-08 | アイシン軽金属株式会社 | Roll bending apparatus for extruded shape material |
| JP6077628B1 (en) * | 2015-10-13 | 2017-02-08 | 財団法人金属工業研究発展中心 | Extrusion molding apparatus and extrusion molding method for producing an extrusion molding material having a non-uniform cross section |
| JP2020131775A (en) * | 2019-02-14 | 2020-08-31 | 日本製鉄株式会社 | Front pillar structure |
| US11134760B2 (en) * | 2019-06-27 | 2021-10-05 | Titan Company Limited | System and method for manufacturing hollow tubular jewellery |
-
1997
- 1997-01-10 JP JP01476597A patent/JP3528492B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010046685A (en) * | 2008-08-21 | 2010-03-04 | Kobe Steel Ltd | Roll-bent member and roll bending method |
| JP2015104734A (en) * | 2013-11-28 | 2015-06-08 | アイシン軽金属株式会社 | Roll bending apparatus for extruded shape material |
| JP6077628B1 (en) * | 2015-10-13 | 2017-02-08 | 財団法人金属工業研究発展中心 | Extrusion molding apparatus and extrusion molding method for producing an extrusion molding material having a non-uniform cross section |
| JP2020131775A (en) * | 2019-02-14 | 2020-08-31 | 日本製鉄株式会社 | Front pillar structure |
| US11134760B2 (en) * | 2019-06-27 | 2021-10-05 | Titan Company Limited | System and method for manufacturing hollow tubular jewellery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3528492B2 (en) | 2004-05-17 |
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