JP4939706B2 - Hydroforming method for metal pipe - Google Patents

Hydroforming method for metal pipe Download PDF

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Publication number
JP4939706B2
JP4939706B2 JP2001266678A JP2001266678A JP4939706B2 JP 4939706 B2 JP4939706 B2 JP 4939706B2 JP 2001266678 A JP2001266678 A JP 2001266678A JP 2001266678 A JP2001266678 A JP 2001266678A JP 4939706 B2 JP4939706 B2 JP 4939706B2
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tube
material tube
mold
pipe
end side
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JP2003071528A (en
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孝彦 内藤
裕司 柿本
直樹 清水
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Sankei Giken Kogyo Co Ltd
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Sankei Giken Kogyo Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、例えば内燃機関の排気管等に用いる金属管のハイドロフォーム加工方法に関する。
【０００２】
【従来の技術】
従来、例えば内燃機関の排気管等に用いる金属管をハイドロフォーム加工によって所望の形状に成形することが行われている。例えば図１１に示すように１つの排気管１に他の排気管２を合流（集合）させる場合には、上記排気管１の一部にハイドロフォーム加工によって膨出部１ｃを形成し、その膨出部１ｃに穴を開けて他方の排気管２を嵌合接続するようにしている。
【０００３】
上記のようなハイドロフォーム加工を施すに当たっては、例えば図１２（ａ）に示すように予め所定の長さに切断した所定太さの素材管１０を、必要に応じて所定の曲げ加工等を施したのち同図（ｂ）のように成形型２０内に配置し、その素材管１０の両端部を同図（ｃ）のようにパンチ２１・２２で成形型２０の内方に押し付けながら、上記各パンチ２１・２２に形成した液体供給孔２１ａ・２２ａから素材管１０内に水等の液体を供給することによって、その液圧で上記素材管１０を成形型２０の内面形状に沿う所定の形状に成形するものである。
【０００４】
ところが、上記のように素材管１０の両端部をパンチ２１・２２で成形型２０の内方に押し込みながらハイドロフォーム加工しても、図のように管の周方向の一部に膨出部１０ｃを形成する場合には、その膨出部１０ｃが肉薄になることは避けられず、強度が低下したり、また場合によっては破損する等の不具合があった。
【０００５】
【発明が解決しようとする課題】
本発明は上記の問題点に鑑みて提案されたもので、管の周方向の一部に膨出部を形成する場合にも肉厚の低下を極力防止することのできるハイドロフォーム加工方法を提供することを目的とする。
【０００６】
【課題を解決するための手段】
上記の目的を達成するために本発明による金属管のハイドロフォーム加工方法は、以下の構成としたものである。即ち、成形型内に金属素材管を配置し、その素材管の両端部にそれぞれ配置した両パンチにより該素材管の端部を押圧すると共に、該素材管内に流体圧を加えるハイドロフォーミング成形により管の一部に膨出部を有する金属管を製造する金属管のハイドロフォーム加工方法であって、前記成形型は、その一端側の内面が該成形型内に配置した前記素材管の外径よりも大きく形成されており、前記成形型内に前記素材管を配置し、その素材管の両端部にそれぞれ前記パンチを配置して当接させると共に、該素材管の一端側の外周面と該成形型の一端側の内面との間に筒体を配置する第１工程と、前記素材管の両端部を前記パンチにより前記成形型の内方に向けて押し込みながら、該素材管内に液体を加圧供給することにより、該素材管の一端側を拡径させると共に該素材管の一端側に前記筒体の端部と当接する段部を形成させる第２工程と、前記素材管の両端部を前記パンチにより前記成形型の内方に向けて押し込むと共に、前記素材管の一端側に形成した段部を前記筒体により該成形型の内方に向けて押し込みながら、該素材管内に液体を加圧供給することにより、前素材管の一端側に膨出部を形成する第３工程とを有し、前記第２工程において、前記素材管の少なくとも一方の端部の前記膨出部を形成する側の前記成形型内への押し込み量が他の領域よりも多くなるようにしたことを特徴とする。
【０００７】
【発明の実施の形態】
以下、前記図１１に示すような管の周方向の一部に膨出部を有する排気管を製造する場合を例にして本発明による金属管のハイドロフォーム加工方法を図に示す実施形態に基づいて具体的に説明する。
【０００８】
図１（ａ）〜（ｃ）は本発明による金属管のハイドロフォーム加工方法の一実施形態を示すプロセス説明図であり、先ず図１（ａ）に示すように予め所定の長さに切断した所定太さの素材管１０を、必要に応じて所定の形状に曲げ加工を施すと共に、その素材管１０の少なくとも一端側の端部１０ｂを膨出部を形成する側が長くなるように斜めに切断する。
【０００９】
次いで、その素材管１０を図１（ｂ）に示すように成形型２０内に挿入するもので、例えば上記成形型２０を２つ割りに形成して、その割型間に素材管１０を装着すればよい。その状態で素材管１０の両端部をそれぞれパンチ２１・２２で成形型２０の内方に押し付けながら、各パンチ２１・２２に形成した液体供給孔２１ａ・２２ａから素材管１０内に水等の液体を加圧供給してハイドロフォーム加工を施すもので、図の場合は各パンチ２１・２２の先端部を素材管１０の両端部に嵌合し、各パンチ２１・２２の周面に形成した段部２１ｂ・２２ｂで素材管１０の端部を押し付ける構成である。図中、２１ｃ、２２ｃはシールリング、２０ｃは膨出部形成用凹部である。
【００１０】
上記のようにして素材管１０の両端部をパンチ２１・２２で成形型２０の内方に押し付けながら、ハイドロフォーム加工を施すことによって、素材管１０の両端部が徐々に成形型２０の内方に押し込まれ、特に前記の膨出部を形成する側が長くなるように斜めに切断した端部１０ｂは、その最先端部から順に押し込まれて膨出部を形成する側に、より多くの材料が供給されて膨出部が増肉されるものである。
【００１１】
上記図１（ａ）は素材管１０の一端部１０ｂ全体を斜めに切断したが、例えば図２（ａ）のように素材管１０の一端部１０ｂにおける膨出部を形成する側の略半部を軸線と直角方向の平坦面に形成し、残りの略半部はそれよりも漸次短くなるように傾斜面に形成する、あるいは同図（ｂ）のように残りの略半部はそれよりも漸次長くなるように傾斜面に形成してもよい。
【００１２】
上記図２（ａ）の場合は前記図１の場合と同様の要領でハイドロフォーム加工を施せばよく、先ず膨出部を形成する側の平坦面がパンチ２２の段部２２ｂに当接して成形型２０の内方に向かって押し込まれ、膨出部を形成する側に、より多くの材料が供給されて膨出部が増肉されるものである。
【００１３】
また図２（ｂ）の場合は、先ず図３（ａ）に示すように素材管１０の傾斜面の先端部に右側パンチ２２の段部２２ｂが当接するようにして成形型２０の内方に向かって押し込むと、上記傾斜面近傍の肉が図中矢印のように膨出部を形成する側に押し込まれて増肉される。そして所定量押し込むと、図３（ｂ）のように素材管の右端部の略全面が右側パンチ２２の段部２２ｂに当接し、引き続き各パンチ２１・２２の液体供給孔２１ａ・２２ａから素材管１０内に水等の液体を加圧供給しながら両パンチ２１・２２を成形型２０の内方に向かって押し込むと、図３（ｃ）のように膨出部側が増肉されながら膨出部１０ｃが形成されるものである。
【００１４】
上記実施形態は、成形型２０内に、形成すべき膨出部と略同一形状の膨出部形成用凹部２０ｃを形成したが、その凹部２０ｃを例えば図４のように成形型２０の一側面側に開口するように大きく形成し、その凹部２０ｃ内に移動型２４を図中矢印方向に移動可能に設けてもよい。そして当初は図４（ａ）のように移動型２４を素材管１０に圧接させて該素材管を固定し、その状態でパンチ２１・２２を成形型２０の内方に向かって押し込むと、上記実施形態と同様に傾斜面近傍の肉が図中矢印のように膨出部を形成する側に押し込まれて増肉される。そして同図（ｂ）のように右側パンチ２２の段部２２ｂが素材管の右端部の略全周に当接する状態もしくはその近傍まで押し込んだところで、各パンチ２１・２２の液体供給孔２１ａ・２２ａから素材管１０内に水等の液体を加圧供給しながら両パンチ２１・２２を更に成形型２０の内方に向かって押し込むと同時に、上記移動型２４を同図（ｂ）の矢印方向に徐々に後退させると、膨出部側が増肉されながら同図（ｃ）のように膨出部１０ｃが形成されるものである。
【００１５】
なお前記図１の実施形態においても上記図４と同様に膨出部形成用凹部２０ｃを成形型２０の一側面側に開口するように大きく形成し、その凹部２０ｃ内に上記と同様の移動型２４を設けてもよい。
【００１６】
また上記各実施形態は両端部をパンチ２１・２２で成形型２０の内方に向かって押し込みながらハイドロフォーム加工により膨出部を形成するようにしたが、素材管１０の一端部をハイドロフォーム加工により予め拡径すると共に、素材管１０に段部を形成し、その段部を筒体等で成形型２０の内方に向かって押し込みながらハイドロフォーム加工により膨出部を形成することもできる。
【００１７】
図５および図６はその一例を示すもので、先ず図６（ａ）に示すように膨出部を形成する側が長くなるように一端１０ｂ側を斜めに切断した素材管１０を、図５（ａ）のように成形型２０内にセットし、その素材管１０の両端部に前記実施形態と同様のパンチ２１・２２を配置する。その素材管１０の一端１０ｂ側の成形型２０の内面２０ａは素材管の外径よりもやや大きく形成され、その素材管１０の外周面と成形型２０の内面との間には筒体２３を配置する。上記成形型２０内には前記図４の実施形態と同様に一端側が成形型２０の一側面側に開口する膨出部形成用の凹部２０ｃが形成され、その凹部２０ｃ内には移動型２４が図中矢印方向に移動可能に設けられている。
【００１８】
上記筒体２３および移動型２４は、当初図５（ａ）の状態に位置し、その状態で、上記両パンチ２１・２２を成形型２０の内方に向かって押し付けながら、各パンチ２１・２２の液体供給孔２１ａ・２２ａから素材管１０内に水等の液体を加圧供給すると、素材管１０の一部が図５（ｂ）および図６（ｂ）のように拡径すると共に、素材管１０に段部１０ｄが形成され、その段部１０ｄに筒体２４の図で左側の端部が当接した状態となる。
【００１９】
その状態で、移動型２４を図５（ｂ）の矢印方向に徐々に後退させると同時に上記両パンチ２１・２２および筒体２３を成形型２０の内方に向かって押し付けながら、各パンチ２１・２２の液体供給孔２１ａ・２２ａから素材管１０内に水等の液体を加圧供給することによって、図５（ｃ）のように膨出部１０ｃが形成されるものである。
【００２０】
上記のように素材管１０の一部を拡径する際、素材管１０の端部１０ｂを膨出部側が長くなるように斜めに形成したので、膨出部側に、より多くの材料が供給されて増肉されると共に、膨出部を形成する際には筒体２４が素材管１０の段部１０ｄを押し込むので確実に押し込むことができるものである。
【００２１】
また上記のようにして作成した管を排気管１として用い、その排気管１に形成した膨出部１ｃに穴を形成して図７のように他の排気管２を接続する場合には、その集合部よりも下流側の端部１ｂの管径が拡径されているのでエンジンへの背圧を低減できる等の利点がある。図中、３は上記端部１ｂに接続した下流側排気管である。
【００２２】
なお上記実施形態は、上記段部１０ｄを、膨出部を形成する側の略半部を周方向に略並行な平坦面に形成し、残りの略半部を膨出部と反対側に傾斜する傾斜面となるようにしたが、図８（ａ）のように段部１０ｄ全体を周方向に平に形成してもよく、あるいは同図（ｂ）のように膨出部側を周方向に略並行な平坦面に形成し、残りの略半部を膨出部側に傾斜する傾斜面となるようにしてもよい。
【００２３】
また前記各実施形態は、増肉するための処理や操作を、素材管１０一端部、特に膨出部を形成する部位に近い側の端部にのみ施したが、素材管１０の両側に施すようにしてもよい。また上記実施形態は複数本（図の場合は２本）の排気管を１本の排気管に集合（合流）させる場合を例にして説明したが、１本の排気管を複数本の排気管に分岐する場合にも適用可能である。
【００２４】
さらに本発明は、例えばＵ字状に屈曲した排気管等の屈曲部を拡径加工する場合などにも適用可能であり、また例えば図９に示すような素材管１０から図１０に示すように断面形状が同図（ｂ）〜（ｄ）のように漸次変化する排気管１等を製造する場合などにも適用することができる。
【００２５】
【発明の効果】
以上のように本発明による金属管のハイドロフォーム加工方法は、上記のように素材管の少なくとも一方の端部の膨出部を形成する側の成形型内への押し込み量が他の領域よりも多くなるようにしたから、膨出部の肉厚が低下するのを極力防止することが可能となり、肉厚の薄い素材管にあっても良好に膨出部を形成できる等の効果がある。
【図面の簡単な説明】
【図１】本発明による金属管のハイドロフォーム加工方法の一実施形態を示すプロセス説明図。
【図２】（ａ）および（ｂ）は素材管の変更例を示す正面図。
【図３】本発明による金属管のハイドロフォーム加工方法の他の実施形態を示すプロセス説明図。
【図４】本発明による金属管のハイドロフォーム加工方法の更に他の実施形態を示すプロセス説明図。
【図５】本発明による金属管のハイドロフォーム加工方法の更に他の実施形態を示すプロセス説明図。
【図６】（ａ）〜（ｃ）は上記実施形態による素材管の加工状態を示す正面図。
【図７】上記実施形態により得られた管を集合管に用いた例の正面図。
【図８】（ａ）および（ｂ）は素材管の途中加工状態の他の例を示す正面図。
【図９】他の素材管の正面図。
【図１０】断面形状が漸次変化した排気管の正面図。
【図１１】従来の集合管の構成例を示す正面図。
【図１２】従来の金属管のハイドロフォーム加工方法の一例を示すプロセス説明図。
【符号の説明】
１、２ 排気管
１ｃ 膨出部
１０ 素材管
１０ａ、１０ｂ 端部
１０ｃ 膨出部
１０ｄ 段部
２０ 成形型
２１、２２ パンチ
２１ａ、２２ａ 液体供給孔
２１ｂ、２２ｂ 段部
２１ｃ、２２ｃ シールリング
２３ 筒体
２４ 移動型[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for hydroforming metal pipes used for, for example, exhaust pipes of internal combustion engines.
[0002]
[Prior art]
Conventionally, for example, a metal pipe used for an exhaust pipe of an internal combustion engine or the like is formed into a desired shape by hydroforming. For example, as shown in FIG. 11, when another exhaust pipe 2 is joined (assembled) to one exhaust pipe 1, a bulging portion 1c is formed in a part of the exhaust pipe 1 by hydroforming, and the expansion is performed. A hole is formed in the protruding portion 1c so that the other exhaust pipe 2 is fitted and connected.
[0003]
In performing the hydroforming as described above, for example, as shown in FIG. 12A, a material pipe 10 having a predetermined thickness that has been cut in advance to a predetermined length is subjected to a predetermined bending process or the like as necessary. After that, it is placed in the mold 20 as shown in FIG. 2B, and both ends of the material tube 10 are pressed inward of the mold 20 with the punches 21 and 22 as shown in FIG. By supplying a liquid such as water into the material tube 10 from the liquid supply holes 21a and 22a formed in the punches 21 and 22, the material tube 10 is formed into a predetermined shape along the inner surface shape of the mold 20 with the fluid pressure. To be molded.
[0004]
However, even if hydroforming is performed while pushing both ends of the material tube 10 into the mold 20 with the punches 21 and 22 as described above, the bulging portion 10c is formed in a part of the circumferential direction of the tube as shown in the figure. In the case of forming the bulged portion, it is inevitable that the bulging portion 10c becomes thin, and there is a problem that the strength is reduced or the case is damaged in some cases.
[0005]
[Problems to be solved by the invention]
The present invention has been proposed in view of the above problems, and provides a hydroform processing method capable of preventing a reduction in wall thickness as much as possible even when a bulging portion is formed in a part of the circumferential direction of a pipe. The purpose is to do.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the metal tube hydroforming method according to the present invention has the following configuration. That is, a metal material pipe placed into the mold, thereby pressing the end of the material tube by both punches arranged on both ends of the material tube, the tube by hydroforming applying fluid pressure to the material tube A metal tube hydroforming method for producing a metal tube having a bulging portion in a part thereof, wherein the forming die has an inner surface on one end side thereof from an outer diameter of the material tube disposed in the forming die. The material tube is disposed in the mold, and the punches are disposed and brought into contact with both ends of the material tube, and the outer peripheral surface on one end side of the material tube and the molding A first step of disposing a cylinder between the inner surface on one end side of the mold, and pressurizing the liquid into the material tube while pushing both ends of the material tube toward the inside of the mold by the punch Supplying one end of the material tube A second step of forming a step portion that contacts the end of the cylindrical body on one end side of the material pipe, and both ends of the material pipe are directed inward of the mold by the punch. One end side of the front material pipe is pressed and liquid is supplied into the material pipe while pushing the step formed on the one end side of the material pipe toward the inside of the mold by the cylindrical body. and a third step of forming a bulging portion, in the second step, the pushing amount to the mold in the side of forming the bulging portion of the at least one end of the material tube are other It is characterized in that it is larger than the area.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for hydroforming a metal pipe according to the present invention will be described based on an embodiment shown in the drawings, taking as an example the case of manufacturing an exhaust pipe having a bulging portion in a part in the circumferential direction of the pipe as shown in FIG. Will be described in detail.
[0008]
FIGS. 1A to 1C are process explanatory views showing an embodiment of a metal tube hydroforming method according to the present invention. First, as shown in FIG. The material tube 10 having a predetermined thickness is bent into a predetermined shape as necessary, and at least one end portion 10b of the material tube 10 is cut obliquely so that the side on which the bulging portion is formed becomes long. To do.
[0009]
Next, the material pipe 10 is inserted into the mold 20 as shown in FIG. 1B. For example, the mold 20 is divided into two parts, and the material pipe 10 is mounted between the molds. do it. In this state, the both ends of the material tube 10 are pressed against the inside of the mold 20 by the punches 21 and 22, respectively, and liquid such as water is introduced into the material tube 10 from the liquid supply holes 21a and 22a formed in the punches 21 and 22. In the case shown in the figure, the tip portions of the punches 21 and 22 are fitted to both end portions of the material tube 10 and formed on the peripheral surfaces of the punches 21 and 22. It is the structure which presses the edge part of the raw material pipe | tube 10 by part 21b * 22b. In the figure, 21c and 22c are seal rings, and 20c is a bulge-forming recess.
[0010]
By performing hydroforming while pressing both ends of the material tube 10 against the inside of the forming die 20 with the punches 21 and 22 as described above, the both ends of the material tube 10 gradually become inward of the forming die 20. In particular, the end portion 10b that is obliquely cut so that the side on which the bulging portion is formed becomes long is inserted into the bulging portion by being pushed in order from the most distal end portion. It is supplied and the bulging part is thickened.
[0011]
In FIG. 1A, the entire one end portion 10b of the material tube 10 is cut obliquely. For example, as shown in FIG. 2A, a substantially half portion on the side where the bulging portion is formed in the one end portion 10b of the material tube 10. Is formed on a flat surface in a direction perpendicular to the axis, and the remaining substantially half portion is formed on an inclined surface so as to be gradually shorter than that, or the remaining substantially half portion is made larger than that, as shown in FIG. You may form in an inclined surface so that it may become long gradually.
[0012]
In the case of FIG. 2 (a), hydroforming may be performed in the same manner as in FIG. 1. First, the flat surface on the side where the bulging portion is formed contacts the step portion 22b of the punch 22 to form. More material is supplied to the side where the bulging portion is formed by being pushed inward of the mold 20 to increase the thickness of the bulging portion.
[0013]
In the case of FIG. 2B, first, as shown in FIG. 3A, the step 22b of the right punch 22 is brought into contact with the tip of the inclined surface of the material tube 10 so as to be inward of the molding die 20. When pushed in, the meat in the vicinity of the inclined surface is pushed into the side where the bulging portion is formed as shown by an arrow in the figure to increase the thickness. Then, when the predetermined amount is pushed in, the substantially entire surface of the right end portion of the material tube comes into contact with the step portion 22b of the right punch 22 as shown in FIG. 3B, and the material tube continues from the liquid supply holes 21a and 22a of the respective punches 21 and 22. When the two punches 21 and 22 are pushed inward of the mold 20 while supplying a liquid such as water under pressure, the bulging portion is increased while the bulging portion is thickened as shown in FIG. 10c is formed.
[0014]
In the above embodiment, the bulging portion forming recess 20c having substantially the same shape as the bulging portion to be formed is formed in the molding die 20, but the concave portion 20c is formed on one side of the molding die 20 as shown in FIG. The movable die 24 may be formed so as to open to the side, and the movable die 24 may be provided in the recess 20c so as to be movable in the direction of the arrow in the figure. Then, initially, as shown in FIG. 4A, the movable die 24 is pressed against the material tube 10 to fix the material tube, and when the punches 21 and 22 are pushed inward of the forming die 20 in this state, As in the embodiment, the meat in the vicinity of the inclined surface is pushed into the side where the bulging portion is formed as shown by an arrow in the figure to increase the thickness. When the step 22b of the right punch 22 is in contact with substantially the entire circumference of the right end of the material tube or when it is pushed into the vicinity thereof as shown in FIG. 5B, the liquid supply holes 21a and 22a of the punches 21 and 22 are pressed. While pressing the liquid such as water into the material tube 10 from the inside, the both punches 21 and 22 are further pushed inward of the mold 20 and at the same time, the movable mold 24 is moved in the direction of the arrow in FIG. When it is gradually retracted, the bulging portion 10c is formed as shown in FIG.
[0015]
In the embodiment shown in FIG. 1 as well, the bulging portion forming recess 20c is formed large so as to open to one side surface of the mold 20 as in FIG. 4, and the same movable mold as described above is formed in the recess 20c. 24 may be provided.
[0016]
In each of the above embodiments, the bulging portion is formed by hydroforming while pushing both ends toward the inside of the mold 20 with the punches 21 and 22. However, one end of the material tube 10 is hydroformed. In addition to expanding the diameter in advance, it is also possible to form a stepped portion in the material pipe 10 and form the bulging portion by hydroforming while pushing the stepped portion inward of the forming die 20 with a cylindrical body or the like.
[0017]
FIG. 5 and FIG. 6 show an example. First, as shown in FIG. 6 (a), the material tube 10 having one end 10b cut obliquely so that the side on which the bulging portion is formed becomes longer is shown in FIG. As in a), it is set in the molding die 20, and punches 21 and 22 similar to those of the above-described embodiment are disposed at both ends of the material tube 10. The inner surface 20a of the forming die 20 on the one end 10b side of the material tube 10 is formed to be slightly larger than the outer diameter of the material tube, and a cylindrical body 23 is provided between the outer peripheral surface of the material tube 10 and the inner surface of the forming die 20. Deploy. As in the embodiment of FIG. 4, a bulging portion forming recess 20 c whose one end opens to one side of the molding die 20 is formed in the molding die 20, and a movable die 24 is formed in the recess 20 c. It is provided to be movable in the direction of the arrow in the figure.
[0018]
The cylindrical body 23 and the movable die 24 are initially located in the state shown in FIG. 5A, and in this state, the punches 21 and 22 are pressed against the inner sides of the molding die 20. When a liquid such as water is pressurized and supplied into the material tube 10 from the liquid supply holes 21a and 22a, a part of the material tube 10 is expanded in diameter as shown in FIGS. 5 (b) and 6 (b). A step portion 10d is formed in the tube 10, and the end portion on the left side in the drawing of the cylindrical body 24 is in contact with the step portion 10d.
[0019]
In this state, the movable die 24 is gradually retracted in the direction of the arrow in FIG. 5B, and at the same time, the punches 21. When a liquid such as water is pressurized and supplied into the material pipe 10 from the liquid supply holes 21a and 22a, the bulging portion 10c is formed as shown in FIG.
[0020]
When expanding a part of the material pipe 10 as described above, the end portion 10b of the material pipe 10 is formed obliquely so that the bulge portion side is long, so that more material is supplied to the bulge portion side. In addition to increasing the thickness, the cylindrical body 24 pushes in the stepped portion 10d of the material tube 10 when the bulging portion is formed, so that it can be pushed in reliably.
[0021]
When the pipe created as described above is used as the exhaust pipe 1 and a hole is formed in the bulging portion 1c formed in the exhaust pipe 1 to connect another exhaust pipe 2 as shown in FIG. Since the pipe diameter of the end portion 1b on the downstream side of the collecting portion is increased, there is an advantage that the back pressure to the engine can be reduced. In the figure, 3 is a downstream exhaust pipe connected to the end 1b.
[0022]
In the above-described embodiment, the stepped portion 10d is formed such that a substantially half portion on the side where the bulging portion is formed is formed on a flat surface substantially parallel to the circumferential direction, and the remaining substantially half portion is inclined to the opposite side to the bulging portion. The entire stepped portion 10d may be formed flat in the circumferential direction as shown in FIG. 8A, or the bulging portion side in the circumferential direction as shown in FIG. 8B. May be formed on a flat surface substantially parallel to the other, and the remaining substantially half portion may be an inclined surface inclined toward the bulging portion side.
[0023]
Moreover, although each said embodiment performed the process and operation for thickening only to the one end part of the raw material pipe | tube 10, especially the edge part near the site | part which forms a bulging part, it applies to both sides of the raw material pipe | tube 10 You may do it. Moreover, although the said embodiment demonstrated as an example the case where several exhaust pipe (2 in the figure) gathered (joins) to one exhaust pipe, one exhaust pipe was made into several exhaust pipe. It can also be applied to the case of branching.
[0024]
Further, the present invention can be applied to a case where a bent portion such as an exhaust pipe bent into a U-shape is subjected to diameter expansion processing, and for example, as shown in FIG. 10 from a material pipe 10 as shown in FIG. The present invention can also be applied to the case where the exhaust pipe 1 or the like whose cross-sectional shape gradually changes as shown in FIGS.
[0025]
【Effect of the invention】
As described above, the metal tube hydroforming method according to the present invention has a push amount into the forming die on the side where the bulging portion of at least one end of the material tube is formed as described above as compared with other regions. Since the thickness is increased, it is possible to prevent the wall thickness of the bulging portion from being lowered as much as possible, and there is an effect that the bulging portion can be satisfactorily formed even in a thin material tube.
[Brief description of the drawings]
FIG. 1 is a process explanatory view showing an embodiment of a metal tube hydroforming method according to the present invention.
FIGS. 2A and 2B are front views showing a modification example of a material pipe. FIGS.
FIG. 3 is a process explanatory view showing another embodiment of the metal tube hydroforming method according to the present invention.
FIG. 4 is a process explanatory view showing still another embodiment of the metal tube hydroforming method according to the present invention.
FIG. 5 is a process explanatory view showing still another embodiment of the metal tube hydroforming method according to the present invention.
6A to 6C are front views showing a processing state of a material pipe according to the embodiment.
FIG. 7 is a front view of an example in which the pipe obtained by the above embodiment is used as a collecting pipe.
FIGS. 8A and 8B are front views showing another example of a state of processing a material pipe halfway.
FIG. 9 is a front view of another material pipe.
FIG. 10 is a front view of an exhaust pipe whose sectional shape gradually changes.
FIG. 11 is a front view showing a configuration example of a conventional collecting pipe.
FIG. 12 is a process explanatory diagram showing an example of a conventional hydroforming method for a metal pipe.
[Explanation of symbols]
1, 2 Exhaust pipe 1c Expanded portion 10 Material tube 10a, 10b End portion 10c Expanded portion 10d Stepped portion 20 Molding die 21, 22 Punch 21a, 22a Liquid supply hole 21b, 22b Stepped portion 21c, 22c Seal ring 23 Cylindrical body 24 Mobile type

Claims (3)

成形型内に金属素材管を配置し、その素材管の両端部にそれぞれ配置した両パンチにより該素材管の端部を押圧すると共に、該素材管内に流体圧を加えるハイドロフォーミング成形により管の一部に膨出部を有する金属管を製造する金属管のハイドロフォーム加工方法であって、
前記成形型は、その一端側の内面が該成形型内に配置した前記素材管の外径よりも大きく形成されており、
前記成形型内に前記素材管を配置し、その素材管の両端部にそれぞれ前記パンチを配置して当接させると共に、該素材管の一端側の外周面と該成形型の一端側の内面との間に筒体を配置する第１工程と、
前記素材管の両端部を前記パンチにより前記成形型の内方に向けて押し込みながら、該素材管内に液体を加圧供給することにより、該素材管の一端側を拡径させると共に該素材管の一端側に前記筒体の端部と当接する段部を形成させる第２工程と、
前記素材管の両端部を前記パンチにより前記成形型の内方に向けて押し込むと共に、前記素材管の一端側に形成した段部を前記筒体により該成形型の内方に向けて押し込みながら、該素材管内に液体を加圧供給することにより、前素材管の一端側に膨出部を形成する第３工程とを有し、
前記第２工程において、前記素材管の少なくとも一方の端部の前記膨出部を形成する側の前記成形型内への押し込み量が他の領域よりも多くなるようにしたことを特徴とする金属管のハイドロフォーム加工方法。The metal material pipe in a mold arranged, with pressing the edge portion of said workpiece tube by both punches arranged on both ends of the material tube by hydroforming applying fluid pressure to the material tube of the tube A metal tube hydroforming method for producing a metal tube having a bulge in part ,
The molding die is formed such that the inner surface on one end side thereof is larger than the outer diameter of the material tube disposed in the molding die,
The material pipe is disposed in the mold, and the punches are disposed and brought into contact with both ends of the material pipe, respectively, and an outer peripheral surface on one end side of the material pipe and an inner surface on one end side of the mold A first step of disposing a cylinder between,
While pushing both ends of the material tube toward the inside of the mold by the punch, the liquid is pressurized and supplied into the material tube, thereby expanding one end side of the material tube and the material tube. A second step of forming a step portion in contact with the end portion of the cylindrical body on one end side;
While pushing both ends of the material tube toward the inside of the mold by the punch, while pushing the step formed on one end side of the material tube toward the inside of the mold by the cylinder, A third step of forming a bulging portion on one end side of the front material tube by pressurizing and supplying a liquid into the material tube;
In the second step, the metal, wherein a pressing amount of the said mold in the side of forming the bulging portion of the at least one end of the material tube has to be greater than in other regions Pipe hydroforming method. 前記成形型内に配置される素材管の少なくとも一端部に傾斜面を形成し、Forming an inclined surface on at least one end of the material pipe disposed in the mold,
前記第２工程では、前記一端部側に配置したパンチが、前記素材管の傾斜面の先端部に当接した状態から該素材管の一端部の略全周に当接する状態になるまで前記素材管を押し込むと共に、前記段部の前記膨出部を形成する側の略半部を該素材管の周方向に略並行な平坦面に形成し、該段部の残りの略半部を該膨出部と反対側に傾斜する傾斜面に形成したことを特徴とする請求項１記載の金属管のハイドロフォーム加工方法。In the second step, the material arranged until the punch disposed on the one end side comes into contact with the substantially entire circumference of the one end of the material tube from the state in contact with the tip of the inclined surface of the material tube. The tube is pushed in, and a substantially half portion of the step portion on the side where the bulge portion is formed is formed on a flat surface substantially parallel to the circumferential direction of the material tube, and the remaining substantially half portion of the step portion is formed in the bulge portion. 2. The hydroforming method for a metal pipe according to claim 1, wherein the metal pipe is formed on an inclined surface inclined to the opposite side to the protruding portion. 前記成形型の一端側には、その一側面側に開口する膨出部形成用の凹部が形成され、該凹部内には、その内部を移動可能な移動型が設けられ、On one end side of the molding die, a concave portion for forming a bulge portion that opens to one side surface is formed, and in the concave portion, a movable mold is provided that can move inside the concave portion.
前記第３工程では、前記パンチおよび前記筒体を成形型の内方に向けて押し込みながら前記素材管内に液体を加圧供給している際に、前記凹部内の移動型を前記素材管の膨出部が形成される部分に押し当てながら、前記開口側に徐々に後退させることを特徴とする請求項１又は２記載の金属管のハイドロフォーム加工法。In the third step, when the liquid is pressurized and supplied into the material tube while pushing the punch and the cylindrical body toward the inside of the forming die, the movable die in the concave portion is expanded. The method of hydroforming a metal tube according to claim 1 or 2, wherein the metal tube is gradually retracted toward the opening while being pressed against a portion where the protruding portion is formed.
JP2001266678A 2001-09-04 2001-09-04 Hydroforming method for metal pipe Expired - Fee Related JP4939706B2 (en)

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