JP2008080381A - Method of manufacturing bent hollow pipe - Google Patents

Method of manufacturing bent hollow pipe Download PDF

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JP2008080381A
JP2008080381A JP2006264969A JP2006264969A JP2008080381A JP 2008080381 A JP2008080381 A JP 2008080381A JP 2006264969 A JP2006264969 A JP 2006264969A JP 2006264969 A JP2006264969 A JP 2006264969A JP 2008080381 A JP2008080381 A JP 2008080381A
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workpiece
hollow pipe
mold
bent
curved hollow
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Takashi Kato
隆 加藤
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Yorozu Corp
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Yorozu Corp
Yorozu Jidosha Kogyo KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a bent hollow pipe by which a good pipe can be formed even when forming a three-dimensionally bent pipe. <P>SOLUTION: This method is a method of manufacturing the bent hollow pipe which is bent and stretched three-dimensionally by butting two side sides of a material W to be worked by performing stepwise press working of a material W to be worked which is a plate with a plurality of forming dies and has a stage where extended parts 15 which are formed on both sides across an extruded part 13 of the material W to be worked which are receded each other while being extruded in the direction of the outside of the surface with the material W to be worked, also forming the extruded part 13 where is bent and stretched in a plane and collar parts 16 which are bent in the pressing direction are formed at the noses of the extended parts 15 by the press working, both the collar parts 16 are formed in the directions in which the collar parts 16 are faced each other by bending the bent parts 17 between the extended parts 15 and the collar parts 16 in the opposite direction as maintaining the bending between the extended parts 15 and the collar parts 16 and a stage where the noses of the collar parts 16 are butted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、湾曲中空パイプの製造方法に関し、特に、サスペンションアームの製造方法に関する。   The present invention relates to a method for manufacturing a curved hollow pipe, and more particularly to a method for manufacturing a suspension arm.

車両用のサスペンションアームのような湾曲した中空パイプを製造する方法として、例えば特許文献１の製造方法がある。この方法は、素材である平板を、複数の成形型を用いて段階的にプレス成形して最終的に２次元的に湾曲した中空パイプに成形する方法であり、中子を用いずに成形することができる。この方法では、まず平板に互いに遠ざかる方向に延在された鍔部を形成し、次に両鍔部が略平行となるようにプレス方向へ屈曲させ、この後、成形型の内壁に沿って両鍔部を突き合わせてパイプを形成する。
特許第３１１４９１８号公報 As a method of manufacturing a curved hollow pipe such as a suspension arm for a vehicle, for example, there is a manufacturing method disclosed in Patent Document 1. This method is a method in which a flat plate as a material is press-molded step by step using a plurality of molds and finally formed into a two-dimensionally curved hollow pipe, which is formed without using a core. be able to. In this method, first, a flange extending in a direction away from each other is formed on a flat plate, and then bent in the pressing direction so that both flanges are substantially parallel, and thereafter, both ends along the inner wall of the mold. The buttocks are butted together to form a pipe.
Japanese Patent No. 3114918

しかし、上述のような方法によると、３次元的に湾曲したパイプを成形する場合には、両鍔部を略平行に屈曲させる際に、一部では鍔部が長くなりすぎ、また他の部位では鍔部が引き込まれて短くなりすぎ、良好なパイプを成形することが困難である。   However, according to the method as described above, when forming a pipe that is curved three-dimensionally, when the both hooks are bent substantially in parallel, some of the hooks become too long, and other parts Then, a collar part is drawn in and becomes too short, and it is difficult to form a good pipe.

本発明は、上記従来技術に伴う課題を解決するためになされたものであり、３次元的に湾曲したパイプを成形する場合においても、良好なパイプを成形可能な湾曲中空パイプの製造方法を提供することを目的とする。   The present invention has been made to solve the problems associated with the above-described prior art, and provides a method for manufacturing a curved hollow pipe capable of forming a good pipe even when a three-dimensionally bent pipe is formed. The purpose is to do.

上記目的は、下記（１）〜（４）に記載の発明により達成される。   The above object is achieved by the inventions described in (1) to (4) below.

（１）平板である被加工材を複数の成形型により段階的にプレス加工することにより被加工材の２側辺を突き合わせて、３次元的に湾曲して伸延する湾曲中空パイプを製造するための湾曲中空パイプの製造方法であって、プレス加工により、前記被加工材に面外方向へ押し出されるとともに面内にて湾曲して伸延する押出部を形成しつつ、前記被加工材の押出部を挟む両側に、互いに遠ざかって延在された延在部を形成し、かつ当該延在部の先端にプレス方向へ屈曲させた鍔部を形成する工程と、前記延在部と鍔部の間の屈曲を維持しつつ、前記押出部と延在部の間の屈曲部を逆方向へ屈曲させることにより、両鍔部を互いに向う方向へ成形する工程と、前記鍔部の先端を突き合せる工程と、を有することを特徴とする湾曲中空パイプの製造方法である。   (1) In order to manufacture a curved hollow pipe that is curved and extended three-dimensionally by abutting two sides of a workpiece by pressing the workpiece, which is a flat plate, stepwise with a plurality of molds. A method for producing a curved hollow pipe according to claim 1, wherein the extruded portion of the workpiece is formed by forming an extruded portion that is pushed out of the surface of the workpiece by pressing and is curved and extended in the plane. Forming extending portions extending away from each other on both sides of the wire, and forming a flange portion bent in the press direction at the tip of the extending portion, and between the extending portion and the flange portion Forming the two flanges in a direction facing each other by bending the bent part between the extruding part and the extending part in the opposite direction while maintaining the bending of the protruding part, and the process of abutting the tips of the flange parts And manufacturing a curved hollow pipe characterized by comprising: It is the law.

（２）前記鍔部を突き合せる工程は、前記鍔部を成形型の内壁に沿って滑らすことにより鍔部を突き合せることを特徴とする上記（１）に記載の湾曲中空パイプの製造方法である。   (2) In the method of manufacturing a curved hollow pipe according to the above (1), the step of abutting the flange portion is configured to abut the flange portion by sliding the flange portion along the inner wall of the mold. is there.

（３）前記鍔部を突き合せる工程は、前記鍔部を成形型の内壁に沿って滑らすことにより鍔部を突き合せつつ、部分的に中子を用いた成形型により鍔部を突き合せることを特徴とする上記（１）に記載の湾曲中空パイプの製造方法である。   (3) The step of abutting the collar part includes butting the collar part partially with a molding die using a core while abutting the collar part by sliding the collar part along the inner wall of the mold. A method for producing a curved hollow pipe according to (1) above, characterized in that

（４）前記湾曲中空パイプの、断面寸法がプレス方向の長さに対してプレス方向と交差する方向の長さが長い部位に対応する位置に、部分的に中子を適用することを特徴とする上記（３）に記載の湾曲中空パイプの製造方法である。   (4) The core is partially applied to a position corresponding to a portion where the cross-sectional dimension of the curved hollow pipe is long in the direction intersecting the press direction with respect to the length in the press direction. The method for producing a curved hollow pipe according to (3) above.

上記（１）に記載の発明によれば、予め延在部と鍔部の間の屈曲を形成した後に、この屈曲を維持しつつ、押出部と延在部の間の屈曲部を逆方向へ屈曲させるため、３次元的に湾曲したパイプを成形する場合において、鍔部が長くなりすぎたり、または短くなりすぎることがなく、良好な湾曲中空パイプを成形することができる。   According to the invention described in (1) above, after forming the bend between the extending portion and the heel portion in advance, the bent portion between the pushing portion and the extending portion is moved in the reverse direction while maintaining this bend. In order to bend, when a three-dimensionally curved pipe is formed, the collar portion is not excessively long or short, and a favorable curved hollow pipe can be formed.

また、上記（２）に記載の発明によれば、鍔部を成形型の内壁に沿って滑らすことにより鍔部を突き合せるため、３次元的に湾曲して伸延する湾曲中空パイプを、中子を用いずに成形することができる。   In addition, according to the invention described in (2) above, the curved hollow pipe that is bent and extended three-dimensionally in order to abut the flange by sliding the flange along the inner wall of the mold, It can shape | mold without using.

また、上記（３）に記載の発明によれば、鍔部を成形型の内壁に沿って滑らすことにより鍔部を突き合せつつ、さらに部分的に中子を用いるため、中子がなければ成形できないような３次元的に湾曲して伸延する湾曲中空パイプであっても、成形することができる。   In addition, according to the invention described in (3) above, since the core is partially used while abutting the collar by sliding the collar along the inner wall of the mold, if there is no core, molding is performed. Even a curved hollow pipe that is curved and extended three-dimensionally cannot be formed.

また、上記（４）に記載の発明によれば、断面寸法がプレス方向の長さに対してプレス方向と交差する方向の長さが長い湾曲中空パイプを成形するために、部分的に中子を適用するため、従来の方法では成形できない上述の形状を成形することができる。   According to the invention described in (4) above, in order to form a curved hollow pipe having a cross-sectional dimension that is long in the direction intersecting the press direction with respect to the length in the press direction, the core is partially formed. Therefore, the above-mentioned shape that cannot be formed by the conventional method can be formed.

本発明の実施の形態を、図面を参照しつつ説明する。   Embodiments of the present invention will be described with reference to the drawings.

図１は湾曲中空パイプを示す図であり、（Ａ）は正面図、（Ｂ）は（Ａ）のＢ−Ｂ線に沿う側面図、（Ｃ）は（Ａ）のＣ−Ｃ線に沿う断面図、（Ｄ）は（Ａ）のＤ−Ｄ線に沿う断面図である。   FIG. 1 is a view showing a curved hollow pipe, (A) is a front view, (B) is a side view taken along line BB in (A), and (C) is taken along line CC in (A). Sectional drawing and (D) are sectional drawings which follow the DD line | wire of (A).

湾曲中空パイプ１は、例えば車両用部材として使用されるサスペンションアームであり、本実施形態では、平板をプレス加工することにより平板の２側辺を突き合わせて作成する。   The curved hollow pipe 1 is a suspension arm used as, for example, a vehicle member. In the present embodiment, the curved hollow pipe 1 is formed by pressing the flat plate so that the two sides of the flat plate are brought into contact with each other.

湾曲中空パイプ１は、図１に示すように３次元的に湾曲して伸延しており、一方の端部では円形断面を有し、他方の端部では矩形断面を有している。また、本湾曲中空パイプ１は平板から形成されるため、伸延方向にわたって溶接ライン２が形成されている。矩形断面で形成される矩形部３は、サスペンションアームのカラーが取り付けられる部位であり、円形のカラーを溶接等により取り付けるための切り込み部４が形成される。   The curved hollow pipe 1 is curved and extended three-dimensionally as shown in FIG. 1, and has a circular cross section at one end and a rectangular cross section at the other end. Moreover, since this curved hollow pipe 1 is formed from a flat plate, the welding line 2 is formed over the extending direction. A rectangular portion 3 formed with a rectangular cross section is a portion to which a collar of a suspension arm is attached, and a cut portion 4 for attaching a circular collar by welding or the like is formed.

矩形部３の断面形状は、溶接ライン２が設けられる辺およびその反対側の辺の２辺の長さＬ１が、他の２辺の長さＬ２よりも長く設定されている。   In the cross-sectional shape of the rectangular portion 3, the length L1 of the two sides of the side where the welding line 2 is provided and the opposite side is set longer than the length L2 of the other two sides.

次に、本実施形態に係る湾曲中空パイプの製造方法について説明する。   Next, the manufacturing method of the curved hollow pipe which concerns on this embodiment is demonstrated.

図２は本実施形態に係る湾曲中空パイプの製造方法の粗成形工程を示す断面図、図３は図２のＩＩＩ−ＩＩＩ線に沿う断面図である。   FIG. 2 is a cross-sectional view showing a rough forming step of the method for manufacturing a curved hollow pipe according to the present embodiment, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

まず、図２，３に示すように、第１成形型６により金属製の平板である被加工材Ｗを粗成形する（粗成形工程）。第１成形型６は、第１上型７と、第１上型７と対向して設けられる第１下型８およびブランクホルダ９とを有している。第１下型８には、第１上型７に向って突出すとともに第１上型７と対向する面にて伸延する凸部１０が形成され、第１上型７には、第１下型８の凸部１０に対応して窪んだ溝部１１が設けられる。第１下型８の外周にはブランクホルダ９が設けられ、ブランクホルダ９と対向して、第１上型７にホルダ面１２が形成される。ホルダ面１２は、溝部１１の外周に形成されて外周方向へ延在し、その外周においてブランクホルダ９方向へ傾斜している。また、ブランクホルダ９は、第１上型７のホルダ面１２の形状と対応する形状で形成される。   First, as shown in FIGS. 2 and 3, a workpiece W, which is a metal flat plate, is roughly formed by the first forming die 6 (rough forming step). The first molding die 6 includes a first upper die 7, a first lower die 8 and a blank holder 9 provided to face the first upper die 7. The first lower mold 8 is formed with a convex portion 10 that protrudes toward the first upper mold 7 and extends on a surface facing the first upper mold 7. The first upper mold 7 includes a first lower mold 8. A recessed groove portion 11 is provided corresponding to the convex portion 10 of the mold 8. A blank holder 9 is provided on the outer periphery of the first lower mold 8, and a holder surface 12 is formed on the first upper mold 7 so as to face the blank holder 9. The holder surface 12 is formed on the outer periphery of the groove 11 and extends in the outer peripheral direction, and is inclined in the direction of the blank holder 9 on the outer periphery. The blank holder 9 is formed in a shape corresponding to the shape of the holder surface 12 of the first upper mold 7.

粗成形工程においては、まず第１成形型６内に被加工材Ｗを設置し、第１下型８を第１上型７から離隔した状態のままブランクホルダ９と第１上型７を近接させ、第１上型７とブランクホルダ９により被加工材Ｗを挟持する。この際に、被加工材Ｗの第１上型７とブランクホルダ９の間に挟持される部位が、ホルダ面１２の形状にしたがって、外周方向へ延在しつつその先端がブランクホルダ方向へ傾斜して形成される。   In the rough molding process, first, the workpiece W is placed in the first mold 6, and the blank holder 9 and the first upper mold 7 are brought close to each other while the first lower mold 8 is separated from the first upper mold 7. The workpiece W is held between the first upper mold 7 and the blank holder 9. At this time, a portion of the workpiece W sandwiched between the first upper mold 7 and the blank holder 9 extends in the outer peripheral direction according to the shape of the holder surface 12, and the tip thereof is inclined toward the blank holder. Formed.

この後、第１下型８を第１上型７に近接させ、被加工材Ｗに、第１上型７の溝部１１に対応して第１上型７方向に突出する押出部１３が形成される。この押出部１３は、被加工材Ｗの面外方向へ押し出されるとともに面内にて湾曲して伸延して形成される。   Thereafter, the first lower mold 8 is brought close to the first upper mold 7, and the extruded portion 13 that protrudes in the direction of the first upper mold 7 corresponding to the groove portion 11 of the first upper mold 7 is formed on the workpiece W. Is done. The extruding portion 13 is formed by being extruded in the out-of-plane direction of the workpiece W and curving and extending in the plane.

この粗成形工程の際には、ブランクホルダ９により被加工材Ｗが挟持されているため、被加工材Ｗの流入の偏りが抑制され、しわ等の発生を防止できる。   In this rough forming process, since the workpiece W is sandwiched by the blank holder 9, the deviation of the inflow of the workpiece W is suppressed, and generation of wrinkles and the like can be prevented.

このように、粗成形工程により、被加工材Ｗには押出部１３の外側の２側辺に、互いに遠ざかって延在する延在部１５と、さらにその先端においてブランクホルダ方向へ屈曲した鍔部１６が形成される。また、押出部１３と延在部１５の間には、第１上型７方向に屈曲した屈曲部１７が形成される。   Thus, by the rough forming step, the workpiece W has two extending sides 15 extending away from each other on the two outer sides of the extruded portion 13, and a flange that is bent toward the blank holder at the tip thereof. 16 is formed. In addition, a bent portion 17 that is bent in the direction of the first upper mold 7 is formed between the extruded portion 13 and the extending portion 15.

次に、粗成形された被加工材Ｗの外周部の不要部分をトリミングする（トリミング工程）。   Next, an unnecessary portion of the outer peripheral portion of the roughly formed workpiece W is trimmed (trimming step).

図４は本実施形態に係る湾曲中空パイプの製造方法のトリミング工程を示す断面図、図５は図４のＩＶ−ＩＶ線に沿う断面図である。   4 is a cross-sectional view showing a trimming step of the method for manufacturing a curved hollow pipe according to the present embodiment, and FIG. 5 is a cross-sectional view taken along line IV-IV in FIG.

粗成形された被加工材Ｗは、図４，５に示すように、第２成形型２０によりトリミングされる。この第２成形型２０は、第２上型２１と第２下型２２とを有している。第２下型２２は、第２上型２１と対向する面の外周端に下型切断刃２３が形成されている。第２上型２１には、第２下型２２と対向して設けられるとともに背面にバネが設けられて第２下型方向へ付勢されたホルダ部２４と、ホルダ部２４の外周に設けられて下型切断刃２３と対となる上型切断刃２５とが設けられる。このホルダ部２４と第２下型２２は、被加工材Ｗの形状に対応する形状を有している。   The roughly formed workpiece W is trimmed by the second mold 20 as shown in FIGS. The second mold 20 includes a second upper mold 21 and a second lower mold 22. The second lower mold 22 has a lower mold cutting blade 23 formed at the outer peripheral end of the surface facing the second upper mold 21. The second upper mold 21 is provided opposite to the second lower mold 22 and is provided with a spring on the back and urged toward the second lower mold, and provided on the outer periphery of the holder section 24. Then, an upper die cutting blade 25 that is paired with the lower die cutting blade 23 is provided. The holder portion 24 and the second lower mold 22 have a shape corresponding to the shape of the workpiece W.

トリンミング工程においては、まず第２成形型２０内に粗成形された被加工材Ｗを設置し、第２上型２１と第２下型２２を近接させる。第２上型２１のホルダ部２４と第２下型２２の間に被加工材Ｗが挟まれると、ホルダ部２４がバネにより付勢されつつ後退する。ホルダ部２４が後退すると、上型切断刃２５と下型切断刃２３の間に被加工材Ｗが挟まれ、被加工材Ｗの外周部が切り落とされる。この後、第２上型２１と第２下型２２を離隔させると、バネの反発力により第２上型２１から被加工材Ｗが取り出される。   In the trimming process, the workpiece W roughly formed in the second mold 20 is first installed, and the second upper mold 21 and the second lower mold 22 are brought close to each other. When the workpiece W is sandwiched between the holder part 24 of the second upper mold 21 and the second lower mold 22, the holder part 24 moves backward while being urged by a spring. When the holder portion 24 moves backward, the workpiece W is sandwiched between the upper die cutting blade 25 and the lower die cutting blade 23, and the outer peripheral portion of the workpiece W is cut off. Thereafter, when the second upper mold 21 and the second lower mold 22 are separated from each other, the workpiece W is taken out from the second upper mold 21 by the repulsive force of the spring.

次に、トリミングされた被加工材Ｗを屈曲させる（屈曲工程）。   Next, the trimmed workpiece W is bent (bending step).

図６は本実施形態に係る湾曲中空パイプの製造方法の屈曲工程を示す断面図、図７は図６のＶＩＩ−ＶＩＩ線に沿う断面図である。   FIG. 6 is a cross-sectional view showing a bending step of the method for manufacturing a curved hollow pipe according to the present embodiment, and FIG. 7 is a cross-sectional view taken along the line VII-VII in FIG.

トリミングされた被加工材Ｗは、図６，７に示すように、上下が反転されて第３成形型３０に設置され、屈曲される。第３成形型３０は、被加工材Ｗが嵌る溝部３３が形成された第３下型３２と、溝部３３に嵌合する凸部３４を備える第３上型３１とを有している。また、第３下型３２には、溝部３３から成形された被加工材Ｗを突き出すための突き出し部３５が備えられている。   As shown in FIGS. 6 and 7, the trimmed workpiece W is turned upside down and placed on the third mold 30 and bent. The third mold 30 includes a third lower mold 32 in which a groove portion 33 into which the workpiece W is fitted and a third upper die 31 having a convex portion 34 that fits into the groove portion 33. Further, the third lower mold 32 is provided with a protruding portion 35 for protruding the workpiece W formed from the groove portion 33.

屈曲工程では、まず第３成形型３０内にトリミングされた被加工材Ｗを上下反転して設置し、第３上型３１と第３下型３２を近接させる。第３上型３１の凸部３４と第３下型３２の溝部３３の間に被加工材Ｗが挟まれると、延在部１５と押出部１３の間の屈曲部１７が、溝部３３に沿って逆方向（第３上型方向）に屈曲されて、押出部１３の両側の延在部１５が第３上型３１方向に向って成形される。なお、溝部３３と凸部３４の側面の間には被加工材Ｗの厚さよりも広い空間が設けられており、第３成形型３０が下死点（または上死点）に達した際に、凸部３４の側面と被加工材Ｗの延在部１５の間に隙間３６が形成される。したがって、延在部１５と鍔部１６の間の屈曲は保持され、両鍔部１６が対向する方向に成形される。   In the bending step, first, the trimmed workpiece W is placed upside down in the third mold 30 and the third upper mold 31 and the third lower mold 32 are brought close to each other. When the workpiece W is sandwiched between the convex portion 34 of the third upper mold 31 and the groove portion 33 of the third lower die 32, the bent portion 17 between the extending portion 15 and the extruded portion 13 extends along the groove portion 33. Then, the bent portions 15 are bent in the opposite direction (the third upper mold direction), and the extending portions 15 on both sides of the extruded portion 13 are molded toward the third upper mold 31 direction. A space wider than the thickness of the workpiece W is provided between the side surfaces of the groove portion 33 and the convex portion 34, and when the third mold 30 reaches bottom dead center (or top dead center). A gap 36 is formed between the side surface of the convex portion 34 and the extending portion 15 of the workpiece W. Therefore, the bending between the extending portion 15 and the flange portion 16 is maintained, and the both flange portions 16 are formed in the facing direction.

第３成形型３０により成形された被加工材Ｗは、溝部３３から突き出し部３５によって突き出される。   The workpiece W molded by the third mold 30 is protruded from the groove 33 by the protruding portion 35.

次に、屈曲工程により屈曲された被加工材Ｗを更に屈曲させる（内曲げ工程）。   Next, the workpiece W bent in the bending process is further bent (inner bending process).

図８は本実施形態に係る湾曲中空パイプの製造方法の内曲げ工程を示す断面図、図９は図８のＩＸ−ＩＸ線に沿う断面図、図１０は図８のＸ−Ｘ線に沿う断面図である。   8 is a cross-sectional view showing an inner bending step of the method for manufacturing a curved hollow pipe according to the present embodiment, FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8, and FIG. 10 is taken along line XX in FIG. It is sectional drawing.

壁形成工程により屈曲された被加工材Ｗは、図８〜１０に示すように、第４成形型４０に設置されて更に屈曲される。第４成形型４０は、被加工材Ｗが嵌る溝部４３が形成された第４下型４２と、溝部４３に嵌合する凸部４４を備える第４上型４１とを有している。また、第４下型４２には、溝部４３から成形された被加工材Ｗを突き出すための突き出し部４５が備えられている。   The workpiece W bent by the wall forming step is installed in the fourth mold 40 and further bent as shown in FIGS. The fourth molding die 40 includes a fourth lower die 42 in which a groove portion 43 into which the workpiece W is fitted and a fourth upper die 41 having a convex portion 44 that fits into the groove portion 43. Further, the fourth lower mold 42 is provided with a protruding portion 45 for protruding the workpiece W molded from the groove portion 43.

内曲げ工程では、まず第４成形型４０内に被加工材Ｗを設置し、第４上型４１と第４下型４２を近接させる。なお、溝部４３と凸部４４の側面の間には、第３成形型３０と同様に被加工材Ｗの厚さよりも広い空間が設けられており、第４成形型４０が下死点（または上死点）に達した際に、凸部４４の側面と被加工材Ｗの間に隙間４６が形成される。したがって、延在部１５と鍔部１６の間の屈曲は保持されて成形される。   In the inner bending step, the workpiece W is first installed in the fourth mold 40, and the fourth upper mold 41 and the fourth lower mold 42 are brought close to each other. A space wider than the thickness of the workpiece W is provided between the side surfaces of the groove 43 and the convex portion 44 in the same manner as the third mold 30, and the fourth mold 40 is at the bottom dead center (or When the top dead center is reached, a gap 46 is formed between the side surface of the convex portion 44 and the workpiece W. Therefore, the bending between the extending portion 15 and the flange portion 16 is maintained and molded.

第４成形型４０の凸部４４は、一方側では第３成形型３０の凸部３４よりも押圧方向に長く、かつ幅が狭く形成され（図９参照）、他方側では第３成形型３０の凸部３４よりも押圧方向に短く、かつ幅が広く形成されている（図１０参照）。また、第４成形型４０の溝部４３も、凸部４４に対応して一方側では第３成形型３０の溝部３３よりも押圧方向に長く、かつ幅が狭く形成され（図９参照）、他方側では第３成形型３０の溝部３３よりも押圧方向に短く、かつ幅が広く形成されている（図１０参照）。したがって、成形される被加工材Ｗは、一方側では押出方向に長く成形され、他方側では幅広に成形される。   The convex portion 44 of the fourth mold 40 is formed longer on the one side in the pressing direction and narrower than the convex portion 34 of the third mold 30 (see FIG. 9), and the third mold 30 on the other side. The protrusion 34 is shorter in the pressing direction and wider than the protrusion 34 (see FIG. 10). Further, the groove portion 43 of the fourth mold 40 is also formed to be longer in the pressing direction and narrower than the groove portion 33 of the third mold 30 on one side corresponding to the convex portion 44 (see FIG. 9), On the side, it is shorter in the pressing direction and wider than the groove 33 of the third mold 30 (see FIG. 10). Therefore, the workpiece W to be molded is molded long in the extrusion direction on one side and broadly formed on the other side.

第４成形型４０により成形された被加工材Ｗは、溝部４３から突き出し部４５によって突き出される。   The workpiece W formed by the fourth mold 40 is protruded from the groove 43 by the protrusion 45.

次に、内曲げ工程により屈曲された被加工材Ｗを更に屈曲させ、両鍔部１６を近接させる（Ｏプレス工程）。   Next, the workpiece W bent by the inner bending process is further bent to bring both flange portions 16 close to each other (O press process).

図１１は本実施形態に係る湾曲中空パイプの製造方法のＯプレス工程を示す断面図、図１２は図１１のＸＩＩ−ＸＩＩ線に沿う断面図、図１３は図１１のＸＩＩＩ−ＸＩＩＩ線に沿う断面図である。   11 is a cross-sectional view showing an O-pressing step of the method for manufacturing a curved hollow pipe according to the present embodiment, FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. 11, and FIG. 13 is taken along line XIII-XIII in FIG. It is sectional drawing.

内曲げ工程により屈曲された被加工材Ｗは、図１１〜１３に示すように、第５成形型５０に設置されて更に屈曲される。第５成形型５０は、被加工材Ｗが嵌る上型溝部５３が形成された第５上型５１と、第５上型５１と対向する第５下型５２とを有している。   As shown in FIGS. 11 to 13, the workpiece W bent by the inner bending process is installed in the fifth mold 50 and further bent. The fifth mold 50 includes a fifth upper mold 51 in which an upper mold groove 53 into which the workpiece W is fitted and a fifth lower mold 52 facing the fifth upper mold 51.

第５下型５２は、上型溝部５３の一端側に対応して窪んで形成される下型溝部５４と、上型溝部５３の他端側に対応して突出して形成される下型突出部５５とを備えている。下型溝部５４は、内曲げ工程において被加工材Ｗが押出方向に長く成形された部位に対応して形成され、下型突出部５５は、内曲げ工程において被加工材Ｗが幅広に成形された部位に対応して形成される。   The fifth lower mold 52 includes a lower mold groove 54 formed to be depressed corresponding to one end side of the upper mold groove 53, and a lower mold protrusion formed to project corresponding to the other end side of the upper mold groove 53. 55. The lower mold groove portion 54 is formed corresponding to a portion where the workpiece W is formed long in the extrusion direction in the inner bending process, and the lower mold protrusion 55 is formed by forming the workpiece W wide in the inner bending process. It is formed corresponding to each part.

Ｏプレス工程では、まず第５成形型５０内に被加工材Ｗを鍔部１６が設けられる側を第５上型５１に向けて設置し、被加工材Ｗの下型突出部５５に対応する部位の内側に、断面が矩形形状の中子５６を設置した後、第５上型５１と第５下型５２を近接させる。上型溝部５３と下型溝部５４の間では、被加工材Ｗが押出方向に長く成形されているため、第５上型５１と第５下型５２が近接することによって、両鍔部１６の先端が上型溝部５３の壁面に沿って移動しつつ接近する。   In the O pressing step, first, the workpiece W is placed in the fifth mold 50 with the side on which the flange 16 is provided facing the fifth upper die 51, and corresponds to the lower mold protrusion 55 of the workpiece W. After the core 56 having a rectangular cross section is installed inside the part, the fifth upper mold 51 and the fifth lower mold 52 are brought close to each other. Since the workpiece W is formed long in the extrusion direction between the upper mold groove 53 and the lower mold groove 54, the fifth upper mold 51 and the fifth lower mold 52 come close to each other, so The tip approaches while moving along the wall surface of the upper mold groove 53.

上型溝部５３と下型突出部５５の間では、被加工材Ｗが幅広に成形されているため、第５上型５１と第５下型５２が近接することにより、両鍔部１６の先端は必ずしも上型溝部５３の壁面に沿って移動しないが、中子５６によって鍔部１６の内側方向への入り込みが防止される。   Since the workpiece W is formed wide between the upper mold groove 53 and the lower mold projecting portion 55, the end of both flange portions 16 is brought about by the fifth upper mold 51 and the fifth lower mold 52 being close to each other. Does not necessarily move along the wall surface of the upper mold groove 53, but the core 56 prevents the flange 16 from entering the inner side.

次に、被加工材Ｗの先端を当接させる（当接工程）。   Next, the tip of the workpiece W is brought into contact (contact process).

図１４は本実施形態に係る湾曲中空パイプの製造方法の当接工程を示す断面図、図１５は図１４のＸＶ−ＸＶ線に沿う断面図、図１６は図１４のＸＶＩ−ＸＶＩ線に沿う断面図である。   14 is a cross-sectional view showing an abutting process of the method for manufacturing a curved hollow pipe according to the present embodiment, FIG. 15 is a cross-sectional view taken along line XV-XV in FIG. 14, and FIG. 16 is taken along line XVI-XVI in FIG. It is sectional drawing.

Ｏプレス工程により両鍔部１６の先端が接近した被加工材Ｗは、図１４〜１６に示すように、第６成形型６０に設置されて、被加工材Ｗの先端が当接するまで屈曲される。第６成形型６０は、被加工材Ｗが嵌る上型溝部６３が形成された第６上型６１と、第６上型６１と対向する第６下型６２とを有している。   As shown in FIGS. 14 to 16, the workpiece W with the tips of both flange portions 16 approached by the O-pressing process is placed on the sixth mold 60 and bent until the tips of the workpiece W come into contact. The The sixth mold 60 includes a sixth upper mold 61 in which an upper mold groove 63 into which the workpiece W is fitted and a sixth lower mold 62 facing the sixth upper mold 61.

第６下型６２は、上型溝部６３の一端側に対応して窪んで形成される下型溝部６４と、上型溝部６３の他端側に対応して突出して形成される下型突出部６５とを備えている。下型溝部６４は、内曲げ工程において被加工材Ｗが押出方向に長く成形された部位に対応して設けられ、下型突出部６５は、内曲げ工程において被加工材Ｗが幅広に成形された部位に対応して設けられる。   The sixth lower mold 62 includes a lower mold groove 64 that is recessed corresponding to one end side of the upper mold groove 63, and a lower mold protrusion formed to project corresponding to the other end side of the upper mold groove 63. 65. The lower die groove portion 64 is provided corresponding to a portion where the workpiece W is formed long in the extrusion direction in the inner bending process, and the lower die protrusion 65 is formed so that the workpiece W is formed wide in the inner bending step. It is provided corresponding to each part.

当接工程では、まず第６成形型６０内に被加工材Ｗを鍔部１６が設けられる側を第６上型６１に向けて設置し、被加工材Ｗの下型突出部６５に対応する部位の内側には、Ｏプレス工程において設置した中子５６を保持した状態のまま、第６上型６１と第６下型６２を近接させる。上型溝部６３と下型溝部６４の間では、被加工材Ｗが押出方向に長く成形され、かつ鍔部１６が内側に屈曲されているため、第６上型６１と第６下型６２が近接することによって、両鍔部１６の先端が上型溝部６３の壁面に沿って移動しつつ接近し、最終的に突き合わされる。   In the contact step, first, the workpiece W is placed in the sixth mold 60 with the side on which the flange portion 16 is provided facing the sixth upper die 61, and corresponds to the lower mold protrusion 65 of the workpiece W. The sixth upper mold 61 and the sixth lower mold 62 are brought close to each other while keeping the core 56 installed in the O-pressing process inside the portion. Between the upper mold groove 63 and the lower mold groove 64, the workpiece W is formed long in the extrusion direction and the flange 16 is bent inward, so that the sixth upper mold 61 and the sixth lower mold 62 are By approaching, the front ends of the both flange portions 16 approach while moving along the wall surface of the upper mold groove portion 63 and are finally abutted.

上型溝部６３と下型突出部６５の間では、第６上型６１と第６下型６２が近接することにより、被加工材Ｗが上型溝部６３、下型突出部６５および中子５６の間で挟まれつつ被加工材Ｗの先端が接近し、最終的に突き合わされる。   Since the sixth upper mold 61 and the sixth lower mold 62 are close to each other between the upper mold groove 63 and the lower mold protrusion 65, the workpiece W is made to move to the upper mold groove 63, the lower mold protrusion 65, and the core 56. The tip of the workpiece W approaches and is finally abutted while being sandwiched between the two.

次に、被加工材Ｗの矩形部３に、円形のカラーを取り付けるための切り込み部４を形成する（切断工程）。   Next, a cut portion 4 for attaching a circular collar is formed in the rectangular portion 3 of the workpiece W (cutting step).

図１７は本実施形態に係る湾曲中空パイプの製造方法の切断工程を示す断面図、図１８は図１７のＸＶＩＩＩ−ＸＶＩＩＩ線に沿う断面図である。   FIG. 17 is a cross-sectional view showing a cutting process of the method for manufacturing a curved hollow pipe according to this embodiment, and FIG. 18 is a cross-sectional view taken along the line XVIII-XVIII in FIG.

当接工程により鍔部１６の先端が当接した被加工材Ｗは、図１７，１８に示すように、中子５６が引き抜かれて第７成形型７０に設置される。第７成形型７０は、被加工材Ｗの形状に対応して形成され、被加工材Ｗを挟持することが可能な第７上型７１および第７下型７２を有している。   As shown in FIGS. 17 and 18, the workpiece W with which the tip end of the flange portion 16 has contacted in the contact process is pulled out and placed in the seventh mold 70. The seventh mold 70 has a seventh upper mold 71 and a seventh lower mold 72 that are formed corresponding to the shape of the workpiece W and can sandwich the workpiece W.

第７上型７１には、カム機構によって被加工材Ｗの矩形部３に対して進退動可能な切断部７３が設けられ、第７下型７２には、切断部７３が貫通可能な切断孔７４が設けられる。なお、切断部７３の進退動方向は、第７成形型７０の押圧方向と異なっている。   The seventh upper die 71 is provided with a cutting portion 73 that can be moved back and forth with respect to the rectangular portion 3 of the workpiece W by a cam mechanism, and the seventh lower die 72 has a cutting hole through which the cutting portion 73 can pass. 74 is provided. The forward / backward moving direction of the cutting part 73 is different from the pressing direction of the seventh mold 70.

切断工程では、まず第７成形型７０内に被加工材Ｗを設置し、被加工材Ｗの矩形部３に対して切断部７３を前進させ、切断部７３と切断孔７４によって矩形部３の切断孔７４と隣接する面を切断し、被加工材Ｗの矩形部３に円形のカラーを取り付けるための切り込み部４を形成する。この後、第７成形型７０から被加工材Ｗを取り出し、両端部の不要部分を切り離して（不図示）、両鍔部１６の突き合わされた先端同士を溶接して成形が完了する。   In the cutting step, the workpiece W is first installed in the seventh mold 70, the cutting portion 73 is advanced with respect to the rectangular portion 3 of the workpiece W, and the rectangular portion 3 is cut by the cutting portion 73 and the cutting hole 74. A surface adjacent to the cutting hole 74 is cut to form a cut portion 4 for attaching a circular collar to the rectangular portion 3 of the workpiece W. Thereafter, the workpiece W is taken out from the seventh molding die 70, unnecessary portions at both ends are cut off (not shown), and the abutted ends of both flange portions 16 are welded to complete the molding.

このように、本実施形態に係る湾曲中空パイプの製造方法によれば、粗成形工程において延在部１５の先端に屈曲した鍔部１６を形成するため、３次元的に湾曲した湾曲中空パイプ１を成形することができる。すなわち、従来の湾曲中空パイプの製造方法を図１９に示すが、従来は、まず平板１００に互いに遠ざかる方向に延在された鍔部１０１を形成し（図１９（Ａ））、次に両鍔部１０１が略平行となるようにプレス方向へ屈曲させ（図１９（Ｂ））、この後、成形型の内壁に沿って両鍔部１０１を突き合わせてパイプを形成している（図１９（Ｃ））。この方法では、２次元的に湾曲した湾曲中空パイプを成形することはできるが、３次元的に湾曲した湾曲中空パイプを成形しようとすると、両鍔部１０１が略平行となるようにプレス方向へ屈曲させる際（図１９（Ｂ）参照）に、鍔部１０１の一方が引き込まれて短くなったり、または長くなり過ぎたりするため、成形が困難である。しかし、本実施形態では、粗成形工程において延在部１５の先端に屈曲した鍔部１６を予め形成し、屈曲工程において延在部１５と押出部１３の間の屈曲部１７を逆方向に屈曲されることで、両鍔部１６を対向する方向に湾曲させることができるため、３次元的に湾曲した湾曲中空パイプ１も良好に成形できる。   Thus, according to the manufacturing method of the curved hollow pipe which concerns on this embodiment, in order to form the collar part 16 bent at the front-end | tip of the extension part 15 in a rough forming process, the curved hollow pipe 1 curved three-dimensionally. Can be molded. That is, FIG. 19 shows a conventional method for manufacturing a curved hollow pipe. Conventionally, first, a flange portion 101 extending in a direction away from each other is first formed on the flat plate 100 (FIG. 19A), and then both sides are formed. The portion 101 is bent in the press direction so as to be substantially parallel (FIG. 19B), and then, the pipes are formed by abutting both flange portions 101 along the inner wall of the mold (FIG. 19C). )). In this method, a curved hollow pipe that is two-dimensionally curved can be formed. However, when a curved hollow pipe that is curved three-dimensionally is to be formed, the two flange portions 101 are substantially parallel to each other in the press direction. When bending (see FIG. 19B), one of the flange portions 101 is drawn and shortens or becomes too long, so that molding is difficult. However, in the present embodiment, the flange portion 16 bent at the tip of the extending portion 15 is formed in advance in the rough forming step, and the bent portion 17 between the extending portion 15 and the extruded portion 13 is bent in the reverse direction in the bending step. As a result, both flange portions 16 can be bent in the opposing direction, and the curved hollow pipe 1 that is three-dimensionally curved can be formed well.

また、従来の方法では、中子を用いないため押圧方向の長さが短い幅広の中空部材（図１（D）参照）を形成することができなかったが、本実施形態では部分的に中子５６を用いるため、部分的に押圧方向の長さが短い幅広の中空部材を成形することができる。   Further, in the conventional method, since a core is not used, a wide hollow member having a short length in the pressing direction (see FIG. 1D) cannot be formed. Since the child 56 is used, a wide hollow member whose length in the pressing direction is partially short can be formed.

なお、本発明は上述した実施の形態に限定されるものではなく、特許請求の範囲内で種々改変することができる。例えば、トリミング工程や切断工程を省くこともできる。また、湾曲中空パイプの形状によっては、中子も用いないで実施することもできる。また、例えばサスペンションアーム以外の湾曲中空パイプに適用することもできる。   The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the trimming process and the cutting process can be omitted. Further, depending on the shape of the curved hollow pipe, it can be carried out without using a core. Further, it can be applied to a curved hollow pipe other than the suspension arm, for example.

湾曲中空パイプを示す図であり、（Ａ）は正面図、（Ｂ）は（Ａ）のＢ−Ｂ線に沿う側面図、（Ｃ）は（Ａ）のＣ−Ｃ線に沿う断面図、（Ｄ）は（Ａ）のＤ−Ｄ線に沿う断面図である。It is a figure which shows a curved hollow pipe, (A) is a front view, (B) is a side view which follows the BB line of (A), (C) is sectional drawing which follows the CC line of (A), (D) is sectional drawing which follows the DD line | wire of (A). 本実施形態に係る湾曲中空パイプの製造方法の粗成形工程を示す断面図である。It is sectional drawing which shows the rough forming process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図２のＩＩＩ−ＩＩＩ線に沿う断面図である。It is sectional drawing which follows the III-III line of FIG. 本実施形態に係る湾曲中空パイプの製造方法のトリミング工程を示す断面図である。It is sectional drawing which shows the trimming process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図４のＩＶ−ＩＶ線に沿う断面図である。It is sectional drawing which follows the IV-IV line of FIG. 本実施形態に係る湾曲中空パイプの製造方法の屈曲工程を示す断面図である。It is sectional drawing which shows the bending process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図６のＶＩＩ−ＶＩＩ線に沿う断面図である。It is sectional drawing which follows the VII-VII line of FIG. 本実施形態に係る湾曲中空パイプの製造方法の内曲げ工程を示す断面図である。It is sectional drawing which shows the internal bending process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図８のＩＸ−ＩＸ線に沿う断面図である。It is sectional drawing which follows the IX-IX line of FIG. 図８のＸ−Ｘ線に沿う断面図である。It is sectional drawing which follows the XX line of FIG. 本実施形態に係る湾曲中空パイプの製造方法のＯプレス工程を示す断面図である。It is sectional drawing which shows the O press process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図１１のＸＩＩ−ＸＩＩ線に沿う断面図である。It is sectional drawing which follows the XII-XII line | wire of FIG. 図１１のＸＩＩＩ−ＸＩＩＩ線に沿う断面図である。It is sectional drawing which follows the XIII-XIII line | wire of FIG. 本実施形態に係る湾曲中空パイプの製造方法の当接工程を示す断面図である。It is sectional drawing which shows the contact process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図１４のＸＶ−ＸＶ線に沿う断面図である。It is sectional drawing which follows the XV-XV line | wire of FIG.


図１４のＸＶＩ−ＸＶＩ線に沿う断面図である。It is sectional drawing which follows the XVI-XVI line of FIG. 本実施形態に係る湾曲中空パイプの製造方法の切断工程を示す断面図である。It is sectional drawing which shows the cutting process of the manufacturing method of the curved hollow pipe which concerns on this embodiment. 図１７のＸＶＩＩＩ−ＸＶＩＩＩ線に沿う断面図である。It is sectional drawing which follows the XVIII-XVIII line of FIG. 従来の湾曲中空パイプの製造方法を説明するための断面図である。It is sectional drawing for demonstrating the manufacturing method of the conventional curved hollow pipe.

符号の説明Explanation of symbols

１ 湾曲中空パイプ、
２ 溶接ライン、
３ 矩形部、
６，２０，３０，４０，５０，６０，７０ 成形型、
１３ 押出部、
１５ 延在部、
１６ 鍔部、
１７ 屈曲部、
５６ 中子、
Ｌ１，Ｌ２ 矩形部の断面側辺の長さ、
Ｗ 被加工材。 1 curved hollow pipe,
2 Welding line,
3 Rectangular part,
6, 20, 30, 40, 50, 60, 70 Mold,
13 Extrusion part,
15 Extension part,
16 Buttocks,
17 Bending part,
56
L1, L2 The length of the side of the cross section of the rectangular part,
W Work material.

Claims (4)

平板である被加工材を複数の成形型により段階的にプレス加工することにより被加工材の２側辺を突き合わせて、３次元的に湾曲して伸延する湾曲中空パイプを製造するための湾曲中空パイプの製造方法であって、
プレス加工により、前記被加工材に面外方向へ押し出されるとともに面内にて湾曲して伸延する押出部を形成しつつ、前記被加工材の押出部を挟む両側に、互いに遠ざかって延在された延在部を形成し、かつ当該延在部の先端にプレス方向へ屈曲させた鍔部を形成する工程と、
前記延在部と鍔部の間の屈曲を維持しつつ、前記押出部と延在部の間の屈曲部を逆方向へ屈曲させることにより、両鍔部を互いに向う方向へ成形する工程と、
前記鍔部の先端を突き合せる工程と、を有することを特徴とする湾曲中空パイプの製造方法。 Curved hollow for manufacturing a curved hollow pipe that is curved and extended three-dimensionally by abutting the two sides of the workpiece by pressing the workpiece, which is a flat plate, stepwise with a plurality of molds A pipe manufacturing method comprising:
By pressing, the extruded material is pushed out of the plane and formed into an extruded portion that is curved and extended in the surface, and is extended away from each other on both sides of the extruded portion of the workpiece. Forming an extended portion and forming a collar portion bent in the press direction at the tip of the extended portion; and
Forming both flanges in directions facing each other by bending the bent part between the extruding part and the extending part in the opposite direction while maintaining the bending between the extending part and the extending part;
And a step of abutting the ends of the flanges. 前記鍔部を突き合せる工程は、前記鍔部を成形型の内壁に沿って滑らすことにより鍔部を突き合せることを特徴とする請求項１に記載の湾曲中空パイプの製造方法。   The method for producing a curved hollow pipe according to claim 1, wherein the step of abutting the flange portion is configured to abut the flange portion by sliding the flange portion along the inner wall of the mold. 前記鍔部を突き合せる工程は、前記鍔部を成形型の内壁に沿って滑らすことにより鍔部を突き合せつつ、部分的に中子を用いた成形型により鍔部を突き合せることを特徴とする請求項１に記載の湾曲中空パイプの製造方法。   The step of abutting the collar part is characterized in that the collar part is butted by a molding die partially using a core while the collar part is abutted by sliding the collar part along the inner wall of the mold. The manufacturing method of the curved hollow pipe of Claim 1. 前記湾曲中空パイプの、断面寸法がプレス方向の長さに対してプレス方向と交差する方向の長さが長い部位に対応する位置に、部分的に中子を適用することを特徴とする請求項３に記載の湾曲中空パイプの製造方法。   The core is partially applied at a position corresponding to a portion of the curved hollow pipe whose cross-sectional dimension is long in a direction intersecting the press direction with respect to the length in the press direction. 4. A method for producing a curved hollow pipe according to item 3.
JP2006264969A 2006-09-28 2006-09-28 Method of manufacturing bent hollow pipe Pending JP2008080381A (en)

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