JP5609322B2 - Method for manufacturing tube member - Google Patents
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- JP5609322B2 JP5609322B2 JP2010150202A JP2010150202A JP5609322B2 JP 5609322 B2 JP5609322 B2 JP 5609322B2 JP 2010150202 A JP2010150202 A JP 2010150202A JP 2010150202 A JP2010150202 A JP 2010150202A JP 5609322 B2 JP5609322 B2 JP 5609322B2
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Description
本発明は、曲げや捩りなどに対する剛性の高いチューブ部材の製造方法に関する。 The present invention relates to a method for manufacturing a tube member having high rigidity against bending and twisting.
例えば、自動車のサスペンションに使用されるサスペンションメンバー等は、本体部分が閉断面構造をしたチューブ部材が用いられている。 For example, a suspension member used for an automobile suspension uses a tube member having a main body portion having a closed cross-sectional structure.
このような閉断面構造をしたチューブ部材は、最近では、例えば、下記特許文献に開示されているチューブハイドロフォーミング方法により成形されることが多い。 Recently, a tube member having such a closed cross-sectional structure is often formed by, for example, a tube hydroforming method disclosed in the following patent document.
この方法は、断面矩形状した鋼管を液圧により拡管し、所定形状に成形するもので、溶接接合部分がなく全体を一体成形できる。したがって、一般的に行われている前記チューブ部材の成形方法である、断面Ｕ字状をした上下２つの部材を最中合わせし、両部材を溶接により接合する方法に比し、部品点数や溶接工程が低減のみでなく、複雑な形状をしたものであっても成形に要する作業時間が短縮でき、コスト的にも作業能率的にも有利となる。 In this method, a steel pipe having a rectangular cross section is expanded by hydraulic pressure and formed into a predetermined shape, and the whole can be integrally formed without a welded joint. Therefore, compared with the method of forming the tube member that is generally performed, two upper and lower members having a U-shaped cross section are joined together, and both members are joined by welding. Not only is the process reduced, but even a complicated shape can shorten the working time required for molding, which is advantageous in terms of cost and work efficiency.
一方、サスペンションメンバーは、車輪側と種々のアームあるいはロッドを介して連結され、アーム上に設けられたショックアブソーバなどを介して車体側とも連結されため、車輪側からの振動あるいは荷重によりチューブ部材自体が形状的に曲げや捩りを受ける。このような曲げや捩りなどに対しては、チューブ部材を補強することが好ましい。 On the other hand, the suspension member is connected to the wheel side via various arms or rods, and is also connected to the vehicle body side via a shock absorber provided on the arm, so that the tube member itself is caused by vibration or load from the wheel side. Undergoes bending and twisting in shape. It is preferable to reinforce the tube member against such bending and twisting.
チューブハイドロフォーミング方法によるチューブ部材の成形と同時にチューブ部材を補強するに当り、例えば、チューブ部材の肉厚を厚くして液圧成形することがあるが、このようにすれば、厚肉にした分、全体的に重量増となり、自動車のサスペンション用チューブ部材としては好ましくない。 To reinforce the tube member at the same time as forming the tube member by the tube hydroforming method, for example, the tube member may be thickened and hydraulically formed. As a result, the overall weight increases, which is not preferable as a suspension tube member for automobiles.
また、チューブハイドロフォーミング方法により、曲げが生じる部位の断面を拡大し、断面２次モーメントや断面係数を増大させることにより補強することもある。しかし、対象部分全体が膨出し、大径化することになるので、このチューブ部材をサスペンションメンバーとして車載すれば、車両レイアウトの制約により車載困難な場合もある。 Further, the tube hydroforming method may reinforce the structure by enlarging the cross section of the portion where the bending occurs and increasing the second moment of section and the section modulus. However, since the entire target portion swells and becomes larger in diameter, if this tube member is mounted on the vehicle as a suspension member, it may be difficult to mount the tube due to vehicle layout constraints.
さらに、断面を拡大することなく曲げや捩り剛性を向上させるために、内部に補強を施すこともある。しかし、チューブ部材内に補強部材を設置し溶着する作業が必要となり、製品コストが増大するのみでなく、重量増となるおそれがある。 Further, in order to improve bending and torsional rigidity without enlarging the cross section, the inside may be reinforced. However, an operation of installing and welding a reinforcing member in the tube member is required, which not only increases the product cost but also may increase the weight.
本発明は、上述した課題を解決するためになされたもので、重量増を伴うことなく、僅かな断面の拡大で曲げや捩りなどに対する強度を高めることができるチューブ部材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 above-described problems, and provides a method of manufacturing a tube member that can increase the strength against bending, twisting, and the like by enlarging a slight cross section without increasing the weight. With the goal.
上記目的を達成する本発明のチューブ部材の製造方法は、成形型におけるキャビティの角部に放射方向外方に向かって突出する膨出部を形成し、前記キャビティ内に設置するワークは、前記膨出部と前記放射方向の張り出し量が同じ予備突出部が角部に形成されたチューブ部材の予備成形体を使用し、この予備成形体の予備突出部を前記膨出部内面に接するようにセットした状態で液圧をかけ、前記予備突出部を前記成形型の膨出部に沿うように成形することを特徴とする。 In the method for manufacturing a tube member of the present invention that achieves the above object, a bulging portion that protrudes radially outward is formed at a corner portion of a cavity in a mold, and a workpiece that is installed in the cavity includes the bulging portion. Using a preformed body of a tube member in which a protruding portion having the same radial projecting amount as that of the protruding portion is formed at a corner portion, and setting the preliminary protruding portion of the preformed body in contact with the inner surface of the protruding portion In this state, a hydraulic pressure is applied, and the preliminary projecting portion is shaped so as to follow the bulging portion of the mold.
本発明に係るチューブ部材の構造によれば、チューブ部材における軸線方向の両端部間に形成された軸線変形部の軸直角断面角部に、放射方向外方に向かって突出する突出部を形成することにより、チューブ部材の断面２次モーメントが増加させ、チューブ部材において要補強部となる部分のみを補強するようにしたので、前記両端部に前後左右あるいは上下から力が作用し、軸線変形部に曲げや捩りなどが生じても、これに対向するチューブ部材となる。また、ハイドロフォーミング方法によりチューブ部材を成形するとき、前記軸線変形部の肉厚も他の部分と同じにすると、チューブ部材全体の重量増加もほとんどないものが得られる。 According to the structure of the tube member according to the present invention, the protruding portion that protrudes outward in the radial direction is formed at the axially perpendicular cross-section corner of the axially deformed portion formed between both axial ends of the tube member. As a result, the moment of inertia of the tube member is increased to reinforce only the portion of the tube member that is to be reinforced. Even if bending or twisting occurs, the tube member faces this. Further, when the tube member is formed by the hydroforming method, if the thickness of the axially deformed portion is the same as that of the other portions, the tube member can be obtained with almost no increase in weight.
本発明に係るチューブ部材の製造方法によれば、予備突出部を形成したチューブ部材の予備成形体を使用し、この予備成形体の突出部を成形型におけるキャビティの角部に放射方向外方に向かって突出するように形成した膨出部内面に接するようにセットした状態で液圧成形するので、液圧成形時に成形型の膨出部に予備成形体の素材が流動しやすく、亀裂等が発生することなく突出部を容易に成形できる。 According to the method for manufacturing a tube member according to the present invention, a preformed body of a tube member formed with a preliminary projection is used, and the projection of the preform is radially outward at the corner of the cavity in the mold. Since it is hydraulically molded in a state where it is set so as to be in contact with the inner surface of the bulging portion formed so as to protrude toward the front, the material of the preform easily flows to the bulging portion of the molding die during hydraulic molding, and cracks etc. The protrusion can be easily formed without being generated.
以下、図面を参照して、本発明の実施の形態を説明する。 Embodiments of the present invention will be described below with reference to the drawings.
本実施の形態に係るチューブ部材が用いられるサスペンションメンバーは、図１に示すように、概して、長尺な４本のチューブ部材Ｔ（Ｔ１，Ｔ２，Ｔ３，Ｔ４の総称）が相互に接合されたものである。各チューブ部材Ｔの端部には、マウント部材Ｍ（Ｍ１，Ｍ２，Ｍ３，Ｍ４の総称）が設けられ、このマウント部材Ｍを介して車輪側と連結する連結部材など（例えば、ロアアーム、アッパアームなど）が連結される。なお、ロアアームと車体（不図示）との間にはショックアブソーバが設けられ、アッパアームにはダイナミックダンパーが設けられ、車輪側から車体側への振動伝達を抑制する。 As shown in FIG. 1, the suspension member in which the tube member according to the present embodiment is used generally has four long tube members T (generic names of T1, T2, T3, and T4) joined to each other. Is. Mount members M (generic names of M1, M2, M3, and M4) are provided at the end portions of the respective tube members T, and connecting members that are connected to the wheel side via the mount members M (for example, lower arms, upper arms, etc.) ) Are connected. A shock absorber is provided between the lower arm and the vehicle body (not shown), and a dynamic damper is provided on the upper arm to suppress vibration transmission from the wheel side to the vehicle body side.
したがって、車載されたサスペンションメンバーに対しては、車両走行中に、前後方向（矢印Ａ）、上下方向（矢印Ｂ）あるいは左右方向など種々の方向から荷重が作用することになる。例えば、チューブ部材Ｔ１において考察すれば、マウント部材Ｍ１に上方に向って荷重Ｆ１が作用し、マウント部材Ｍ２に下方に向って荷重Ｆ２が作用すれば、長尺なチューブ部材Ｔ１における軸線方向の両端部間に存在する湾曲した部分、つまり長尺なチューブ部材Ｔ１の軸線が直状でなく屈曲あるいは湾曲した軸線変形部Ｘには、曲げや捩りなどが生じ、これによって歪も生じることから、軸線変形部Ｘは、補強を施す必要がある要補強部となる。ここに、補強を施す前のチューブ部材Ｔ１としては、軸線方向には比較的長尺なもので、その軸直角断面は、図２に示すように、４角形状をしたものである。 Therefore, loads are applied to the suspension member mounted on the vehicle from various directions such as the front-rear direction (arrow A), the vertical direction (arrow B), and the left-right direction while the vehicle is traveling. For example, considering the tube member T1, if the load F1 acts on the mount member M1 upward and the load F2 acts on the mount member M2 downward, both ends of the long tube member T1 in the axial direction. Since the curved portion existing between the portions, that is, the axial deformed portion X in which the axis of the long tube member T1 is not straight but is bent or curved, bending, twisting, and the like are generated, thereby causing distortion. The deformed portion X is a reinforced portion that needs to be reinforced. Here, the tube member T1 before the reinforcement is relatively long in the axial direction, and the cross section perpendicular to the axis has a quadrangular shape as shown in FIG.
軸線変形部Ｘのような要補強部が存在するチューブ部材Ｔ１を、チューブハイドロフォーミング方法により成形する場合、チューブ部材Ｔ１の軸直角断面積を単純に大きくして補強すると、断面４角形状が縦横に広がり大きくなり、これを用いてサスペンションメンバーを形成すると、車両レイアウトの制約により実現が困難になる可能性がある。 When the tube member T1 having the reinforcing portion such as the axial deformed portion X is formed by the tube hydroforming method, if the tube member T1 is reinforced by simply increasing the cross-sectional area perpendicular to the axis, the rectangular shape of the cross section becomes vertical and horizontal. If the suspension member is formed using this, it may be difficult to realize due to restrictions on the vehicle layout.
しかし、要補強部の角部１のみに、図３に示すような突出部２を設けて断面積を大きくすれば、車両レイアウトの制約に関する問題は生じにくい。チューブ部材Ｔ１における角部１の周辺は、隣接する部材との関係ではデッドスペースになることが多いからである。特に、本実施形態の軸線変形部Ｘは、軸線方向において円弧状に湾曲した部分であり、この部分の軸直角断面における角部１に突出部２を設けるとき、円弧状軸線に沿って形成すると、軸線変形部Ｘの全長にわたり補強することができ、好ましい。なお、軸線変形部Ｘとしては、円弧状のもののみに限定されるものではないが、ジグザグに変形したものあるいは屈曲したものなどは、局部的な応力集中が生じやすいので、好ましくない。 However, if the projecting portion 2 as shown in FIG. 3 is provided only at the corner portion 1 of the reinforcing portion to increase the cross-sectional area, problems relating to vehicle layout restrictions are unlikely to occur. This is because the periphery of the corner portion 1 in the tube member T1 often becomes a dead space in relation to the adjacent members. In particular, the axial deformation portion X of the present embodiment is a portion curved in an arc shape in the axial direction, and when the protruding portion 2 is provided at the corner portion 1 in the cross section perpendicular to the axis of this portion, it is formed along the arc-shaped axis line. It is possible to reinforce the entire length of the axial deformation portion X, which is preferable. The axial deformed portion X is not limited to an arc shape, but a zigzag deformed or bent one is not preferable because local stress concentration tends to occur.
そこで、チューブ部材Ｔ１における要補強部の角部１のみに突出部２を設ける場合、どのような突出部２を形成すれば、実効性ある補強を行うことができるかについて種々検証することを試みた。検証は、図２に示す基本となるチューブ部材Ｔに対し同じ突出長で突出方向のみが異なる突出部２を種々形成したとき、断面２次モーメントの大きさにどの程度影響するかの観点から行った。各種突出部を有するチューブ部材Ｔと、これら各断面２次モーメントの大きさの検証結果を、図４に表で示す。 Then, when providing the protrusion part 2 only in the corner | angular part 1 of the reinforcement part required in the tube member T1, it will try various verification about what kind of protrusion part 2 can be formed and effective reinforcement can be performed. It was. The verification is performed from the viewpoint of how much influence is exerted on the magnitude of the secondary moment of section when various projections 2 having the same projection length and different only in the projection direction are formed on the basic tube member T shown in FIG. It was. The verification result of the magnitude | size of the tube member T which has various protrusion parts, and each of these cross-section secondary moment is shown with a table | surface in FIG.
図４（ａ）欄に基本となるチューブ部材Ｔを示す。基本となるチューブ部材Ｔは、図２に示す断面を有するものであるが、縦長６０ｍｍ×横長８０ｍｍの断面４角形状を有するものを使用した。チューブ部材Ｔを軸直角に切断したときの端面の面積（以下、単に断面積）、Ｘ軸を中心軸線とする断面２次モーメント（Ｉｘｘ）、Ｙ軸を中心軸線とする断面２次モーメント（Ｉｙｙ）を全て「１００」に設定した。 The basic tube member T is shown in FIG. The basic tube member T has a cross section shown in FIG. 2, but a tube member having a square shape with a length of 60 mm × width of 80 mm was used. The area of the end face when the tube member T is cut at right angles (hereinafter simply referred to as a cross-sectional area), the secondary moment of inertia (Ixx) with the X axis as the central axis, and the secondary moment of inertia (Iyy) with the Y axis as the central axis ) Were all set to “100”.
まず、図４（ｂ）欄に示すように、チューブ部材Ｔの４つの角部１全てに、角部１を構成する短辺３と長辺４の内、短辺側に短辺と直交する方向、つまり、短辺３を構成する部材の面に直交する方向に突出部２を５ｍｍ突出させたものについて、基本となるチューブ部材Ｔの設定値「１００」に対する比率を検証した。この場合のチューブ部材Ｔの断面積は、１０７．５であり、Ｘ軸を中心軸線とする断面２次モーメント（Ｉｘｘ）は、１１１．１、Ｙ軸を中心軸線とする断面２次モーメント（Ｉｙｙ）は、１２７．５であった。 First, as shown in the column (b) of FIG. 4, all the four corners 1 of the tube member T are orthogonal to the short side on the short side of the short side 3 and the long side 4 constituting the corner 1. The ratio with respect to the set value “100” of the basic tube member T was verified for the direction in which the protruding portion 2 protrudes 5 mm in the direction perpendicular to the surface of the member constituting the short side 3. In this case, the sectional area of the tube member T is 107.5, and the sectional secondary moment (Ixx) having the X axis as the central axis is 111.1, and the sectional secondary moment (Iyy) having the Y axis as the central axis. ) Was 127.5.
次に、図４（ｃ）欄に示すように、４つの角部１全てに、角部１を構成する短辺３と長辺４の内、長辺側に長辺と直交する方向、つまり、長辺４を構成する部材の面に直交する方向に突出部２を５ｍｍ突出させたものは、断面積が１０７．９であり、Ｘ軸を中心軸線とする断面２次モーメント（Ｉｘｘ）が１１９．０、Ｙ軸を中心軸線とする断面２次モーメント（Ｉｙｙ）が１１０．０であった。 Next, as shown in the column (c) of FIG. 4, all four corners 1 have a direction perpendicular to the long side on the long side of the short side 3 and the long side 4 constituting the corner 1, that is, In the case where the projecting portion 2 is projected 5 mm in a direction perpendicular to the surface of the member constituting the long side 4, the sectional area is 107.9, and the sectional moment (Ixx) having the X axis as the central axis is The cross-sectional secondary moment (Iyy) with the Y-axis as the central axis was 119.0 and 110.0.
さらに、図４（ｄ）欄に示すように、突出部２を斜め方向、つまり長辺４若しくは短辺３に対する傾斜角が４５°となる方向に５ｍｍ突出させたものは、断面積が１１１．４であり、Ｘ軸を中心軸線とする断面２次モーメント（Ｉｘｘ）が１１９．８、Ｙ軸を中心軸線とする断面２次モーメント（Ｉｙｙ）が１２０．３であった。 Further, as shown in the column of FIG. 4D, the projecting portion 2 is projected 5 mm in an oblique direction, that is, in a direction in which the inclination angle with respect to the long side 4 or the short side 3 is 45 °, the cross-sectional area is 111. The sectional secondary moment (Ixx) having the X axis as the central axis was 119.8, and the sectional secondary moment (Iyy) having the Y axis as the central axis was 120.3.
検証結果を棒グラフで示すと、図５に示すようになる。この結果から判断すれば、１００以上の値を示すものは、全て良好なものであるから、チューブ部材Ｔの短辺方向または長辺方向のどちらかに突出部２を形成すると、短辺方向（高さ方向）または長辺方向（幅方向）の断面２次モーメントＩｘｘ又はＩｙｙが増加するので捩り剛性などは向上することになる。したがって、要補強部の角部１に突出部２を設けたものは、図４（ｂ）（ｃ）（ｄ）のいずれのものも良好な結果が得られることが判明した。 The verification result is shown in a bar graph as shown in FIG. Judging from this result, since those showing values of 100 or more are all good, if the protruding portion 2 is formed in either the short side direction or the long side direction of the tube member T, the short side direction ( Since the secondary moment of inertia Ixx or Iyy in the height direction) or the long side direction (width direction) increases, the torsional rigidity and the like are improved. Accordingly, it has been found that the result of providing the protrusions 2 at the corners 1 of the reinforced portions is good in any of FIGS. 4B, 4C and 4D.
しかも、突出部２は、チューブ部材Ｔの湾曲部Ｘのみに形成すればよく、肉厚ｔも他の部分と同じであるため、重量増は微小で、断面の拡大も僅かで、車両レイアウトの制約があっても殆ど問題となることもない。 In addition, the protruding portion 2 only needs to be formed in the curved portion X of the tube member T, and the wall thickness t is the same as the other portions. Even if there is a restriction, there is almost no problem.
特に、図４（ｄ）欄に示す斜め方向に突出部２を形成したもの、つまり、図３に示す４５度の方向に突出したチューブ部材Ｔは、短辺方向（高さ方向）のみ、又は長辺方向（幅方向）のみのものよりも、断面２次モーメントＩｘｘ、Ｉｙｙの両者とも大きく、他の場合よりも曲げや捩りなどの剛性が高く、あらゆる方向から荷重が作用するサスペンションメンバーを補強する手段としては有効なことが判明した。しかも、突出部２を湾曲部Ｘのみに形成すれば、短辺３と長辺４の両方向に突出部２を形成したものに比し、重量増をより抑制でき、その曲げ剛性も高く、捩り固有値（共振周波数）をより高くすることができる。このため、ダイナミックダンパーなどのような音振チューニング部品を廃止させることも可能となる。 Particularly, the tube member T protruding in the oblique direction shown in the column (d) of FIG. 4, that is, the tube member T protruding in the direction of 45 degrees shown in FIG. 3 is only in the short side direction (height direction), or Both the secondary moments Ixx and Iyy are larger than those in the long side direction (width direction) only, and the suspension member that has higher rigidity such as bending and torsion than the other cases and that receives loads from all directions is reinforced. It proved to be effective as a means to do this. In addition, if the protruding portion 2 is formed only on the curved portion X, the increase in weight can be further suppressed and the bending rigidity is high as compared with the case where the protruding portion 2 is formed in both the short side 3 and the long side 4. The eigenvalue (resonance frequency) can be made higher. For this reason, it is possible to abolish sound vibration tuning parts such as a dynamic damper.
次に、成形方法を説明する。 Next, a molding method will be described.
まず、図６、図７に示すような成形型１０を準備する。液圧成形装置に使用される成形型１０は、上型１１と下型１２とを有し、両者を型締めしたときには、内部にワークＷが収容されるキャビティ１３が形成される。本実施形態のキャビティ１３は、内部に長尺なワークＷが収容されるので、ワークＷの軸線方向に長く、その長手方向に直交する断面は、図６に示すように、略矩形状となっている。 First, a mold 10 as shown in FIGS. 6 and 7 is prepared. The molding die 10 used in the hydraulic molding apparatus has an upper die 11 and a lower die 12, and when both are clamped, a cavity 13 in which the workpiece W is accommodated is formed. Since the cavity 13 of the present embodiment accommodates a long workpiece W therein, a cross section that is long in the axial direction of the workpiece W and orthogonal to the longitudinal direction thereof is substantially rectangular as shown in FIG. ing.
特に、本実施形態のキャビティ１３は、図６に示すように、長手方向に直交する断面が矩形状を呈するように形成され、この矩形の角部１４（１４ａ，１４ｂ，１４ｃ，１４ｄの総称）に、放射方向外方に向かって突出する膨出部１５（１５ａ，１５ｂ，１５ｃ，１５ｄの総称）が形成されている。 In particular, as shown in FIG. 6, the cavity 13 of this embodiment is formed so that a cross section orthogonal to the longitudinal direction has a rectangular shape, and this rectangular corner portion 14 (generic name of 14a, 14b, 14c, 14d). In addition, a bulging portion 15 (generic name of 15a, 15b, 15c, 15d) that protrudes outward in the radial direction is formed.
各膨出部１５の突出方向は、角度的には、各角部１４を構成するキャビティ１３の型面１７と型面１８（同様に型面１８，１９、型面１９，２０若しくは型面２０，１７）に対し４５度傾斜した方向とされ、図４（ｄ）欄に記載の突出部２を有するチューブ部材Ｔを形成するものとして構成されている。なお、膨出部１５は、図７に示すように、キャビティ１３の長手方向の一部であってもよく、キャビティ１３全長にわたって形成したものであってもよい。 The protruding direction of each bulging portion 15 is angularly determined from the mold surface 17 and the mold surface 18 of the cavity 13 constituting each corner portion 14 (similarly, the mold surfaces 18 and 19, the mold surfaces 19 and 20, or the mold surface 20 , 17) and a tube member T having a protruding portion 2 described in the column of FIG. 4 (d). As shown in FIG. 7, the bulging portion 15 may be a part of the cavity 13 in the longitudinal direction, or may be formed over the entire length of the cavity 13.
特に、本実施形態のキャビティ１３は、図６に示すように、一対の対向する膨出部１５ｂ，１５ｄが成形型１０の合わせ面１６を跨って形成されている。この結果、他の一対の対向する角部１４ａ，１４ｃに形成される膨出部１５ａ，１５ｃは、必然的にキャビティ１３の内方に向かって開口する状態になる。 In particular, as shown in FIG. 6, the cavity 13 of the present embodiment has a pair of opposed bulging portions 15 b and 15 d formed across the mating surface 16 of the mold 10. As a result, the bulging portions 15 a and 15 c formed on the other pair of opposite corner portions 14 a and 14 c are inevitably opened toward the inside of the cavity 13.
このようにすれば、液圧成形装置は、下型１２を静止状態とし、上型１１のみが作動するようにすることもでき、略矩形状をしたワークＷを、例えば、上面が水平でなく、傾斜させた状態でキャビティ１３に投入すれば、一方向からの型締めで、液圧成形が可能となり、設備的に簡素化でき、コスト的に有利となる。また、作業的には、成形後のチューブ部材を取り出しやすくなる。 In this way, the hydraulic forming apparatus can also make the lower mold 12 stationary and allow only the upper mold 11 to operate. For example, the workpiece W having a substantially rectangular shape is not flat on the upper surface. If it is put into the cavity 13 in an inclined state, it is possible to perform hydraulic forming by clamping from one direction, which can be simplified in terms of equipment and is advantageous in terms of cost. Moreover, it becomes easy to take out the tube member after shaping | molding in operation | work.
次に、使用するワークＷは、図６に示すように、軸直角断面が略矩形状のプリフォームした予備成形体を準備する。つまり、キャビティ１３に形成された膨出部１５の突出量と同じ張り出し量の予備突出部２ａが、ワークＷの軸直角断面の角部に形成されたチューブ状の予備成形体を準備する。また、ワークＷの大きさとしては、長手方向はキャビティ１３内に収容できる長さであることは当然であるが、これに直交する方向の大きさは、キャビティ１３内において上型１１と下型１２により型締めされたとき、上型１１と下型１２により加圧され、図６に示すように、予備突出部２ａ間の中間部ｍが放射方向内方に膨出される程度のものが好ましい。つまり、後に詳述するが、液圧成形時に中間部ｍの肉を予備突出部２ａに利用する、いわゆる肉寄せが生じ程度の大きさであることが好ましい。 Next, as shown in FIG. 6, a workpiece W to be used is prepared as a preform with a preform having a substantially rectangular cross section perpendicular to the axis. That is, a tube-shaped pre-formed body is prepared in which the preliminary protruding portion 2 a having the same protruding amount as the protruding amount of the bulging portion 15 formed in the cavity 13 is formed at the corner of the workpiece W at the right-angle cross section. In addition, as a size of the workpiece W, it is natural that the longitudinal direction is a length that can be accommodated in the cavity 13, but the size in the direction orthogonal to this is the upper mold 11 and the lower mold in the cavity 13. When the mold 12 is clamped, it is preferably pressed by the upper mold 11 and the lower mold 12 so that the intermediate portion m between the preliminary projections 2a bulges radially inward as shown in FIG. . In other words, as will be described in detail later, it is preferable that the thickness of the so-called meat gathering that uses the meat of the intermediate portion m for the preliminary projecting portion 2a at the time of hydroforming.
なお、ワークＷには、図７に示すように、長手方向端部に下型１２に設けられた液圧注入用のヘッド２２が挿入される通孔２１を開設しておく。 Note that the word over click W, as shown in FIG. 7, previously opened a hole 21 in which a liquid douche needful head 22 provided on the lower die 12 in the longitudinal direction end portion is inserted.
このように構成されたワークＷを成形型１０のキャビティ１３内にセットする。この場合、ワークＷに形成した予備突出部２ａがキャビティ１３の膨出部１５に対応するようにセットする。 The workpiece W thus configured is set in the cavity 13 of the mold 10. In this case, the preliminary protrusion 2 a formed on the workpiece W is set so as to correspond to the bulging portion 15 of the cavity 13.
そして、成形型１０を作動し、上型１１と下型１２がワークＷを型締めすると、液圧注入用のヘッド２２がワークＷの通孔２１に入り込み、液圧供給の準備ができる。一方、キャビティ１３内においては、ワークＷが上型１１と下型１２により加圧され、予備突出部２ａ間の中間部ｍが放射方向内方に向かって膨出される。 When the molding die 10 is operated and the upper die 11 and the lower die 12 clamp the workpiece W, the hydraulic pressure injection head 22 enters the through-hole 21 of the workpiece W and preparation for supplying hydraulic pressure is completed. On the other hand, in the cavity 13, the workpiece W is pressurized by the upper mold 11 and the lower mold 12, and the intermediate portion m between the preliminary projecting portions 2 a bulges inward in the radial direction.
この状態で、図外の液圧供給装置から液圧注入用ヘッド２２を介してワークＷ内に液圧を供給すると、ワークＷでは予備突出部２ａ間の中間部ｍが液圧によりキャビティ１３の内面に向かって膨出されることになり、この中間部ｍの肉が各角部に向かうことになる。これにより、いわゆる肉寄せが生じる。したがって、予備成形体の素材が円滑に流動され、予備突出部２ａは、中間部ｍの肉を利用して膨出成形され、キャビティ１３の膨出部１５に沿って円滑に変形され、亀裂等が発生することなく、所望の突出部２が成形される。 In this state, when the hydraulic pressure is supplied into the workpiece W from the hydraulic pressure supply device (not shown) via the hydraulic pressure injection head 22, the intermediate portion m between the preliminary projecting portions 2 a of the workpiece W is caused by the hydraulic pressure in the cavity 13. It will bulge toward the inner surface, and the meat of this intermediate part m will go to each corner. Thereby, what is called meat gathering arises. Therefore, the raw material of the preformed body is smoothly flowed, and the preliminary projecting portion 2a is bulged and formed using the meat of the intermediate portion m, is smoothly deformed along the bulged portion 15 of the cavity 13, and cracks, etc. The desired protrusion 2 is formed without the occurrence of.
この成形後、上型１１と下型１２とを離間すると、ワークＷの突出部２がキャビティ１３の膨出部１５内まで入り込んだ状態であっても、上型１１と下型１２の合わせ面から上半分が露出した状態となるので、ワークＷをキャビティ１３内から簡単に取り出すことができる。 After the molding, when the upper mold 11 and the lower mold 12 are separated from each other, even if the protruding portion 2 of the workpiece W enters the bulging portion 15 of the cavity 13, the mating surface of the upper mold 11 and the lower mold 12 Since the upper half is exposed, the workpiece W can be easily taken out from the cavity 13.
上述した本実施の形態は、以下の効果を奏する。 The above-described embodiment has the following effects.
（ａ）本実施の形態のチューブ部材Ｔの構造では、軸直角断面４角形状をしたチューブ部材Ｔの軸線変形部Ｘにおける４つの角部１に、軸直角断面放射方向外方に向かって突出する突出部２を形成したので、チューブ部材Ｔの断面２次モーメントが増加し、曲げ剛性や捩り剛性が向上し、曲げなどに対する補強を必要とする部分の補強ができる。しかも、ハイドロフォーミング方法により成形するとき、軸線変形部Ｘの肉厚も他の部分と同じにすると、全体重量の増加も微小で、断面の拡大も僅かであり、また、車両レイアウトの制約があっても突出部２が邪魔になるなどの問題は生じることもない。 (A) In the structure of the tube member T according to the present embodiment, the axially perpendicular section protrudes outward in the radial direction at the four corners 1 of the axially deformed portion X of the tubular member T having a rectangular shape. Since the projecting portion 2 is formed, the sectional moment of inertia of the tube member T is increased, the bending rigidity and the torsional rigidity are improved, and the portion requiring reinforcement against bending can be reinforced. Moreover, when forming by the hydroforming method, if the thickness of the axial deformation portion X is the same as that of the other portions, the increase in the overall weight is very small, the cross-section is only slightly enlarged, and there are restrictions on the vehicle layout. However, there is no problem that the projecting portion 2 gets in the way.
（ｂ）チューブ部材Ｔが有する４つの角部１に、この角部１を構成する辺３，４のいずれか一方に直交する方向に突出する突出部２を形成すれば、短辺３の方向（高さ方向）または長辺４の方向（幅方向）の少なくともどちらかの断面２次モーメントが増加し、曲げ剛性や捩り剛性が向上する。 (B) If the projecting portion 2 projecting in a direction orthogonal to any one of the sides 3 and 4 constituting the corner portion 1 is formed on the four corner portions 1 of the tube member T, the direction of the short side 3 The secondary moment of the cross section increases in at least one of (the height direction) and the direction of the long side 4 (the width direction), and the bending rigidity and the torsional rigidity are improved.
（ｃ）突出部２を、角部１を構成する辺３，４のいずれか一方に対し４５度の方向に突出すれば、角部１を構成する辺３，４のいずれにも直交する方向に突出したものに比し重量をより軽くすることができる。また、１つの角部に１つの突出部を設けることにより、短辺３の方向（高さ方向）にも長辺４の方向（幅方向）にも断面２次モーメントを増加させることができるので、曲げ剛性や捩り剛性を向上できる。その結果、捩り固有値（共振周波数）の増加にも繋がるので、ダイナミックダンパー等のような音振チューニング部品を廃止することもできる。 (C) If the protrusion 2 protrudes in a direction of 45 degrees with respect to any one of the sides 3 and 4 constituting the corner 1, the direction orthogonal to both the sides 3 and 4 constituting the corner 1 The weight can be made lighter than that projected. Also, by providing one protrusion at one corner, the cross-sectional secondary moment can be increased in both the direction of the short side 3 (height direction) and the direction of the long side 4 (width direction). , Bending rigidity and torsional rigidity can be improved. As a result, the torsional eigenvalue (resonance frequency) is also increased, so that a sound vibration tuning component such as a dynamic damper can be eliminated.
（ｄ）本実施の形態のチューブ部材Ｔの製造方法では、キャビティ１３の角部１４に形成した膨出部１５に、チューブ状の予備成形体（ワークＷ）の角部１に形成した予備突出部２ａが対応するようにセットした状態で、液圧成形するので、予備成形体の素材が成形型１１，１２の膨出部１５に流動しやすく、亀裂等を発生させることなく突出部２を成形できる。 (D) In the manufacturing method of the tube member T according to the present embodiment, the pre-projection formed on the corner 1 of the tube-shaped preform (work W) is formed on the bulging portion 15 formed on the corner 14 of the cavity 13. Since the molding is performed in a state in which the portions 2a correspond to each other, the material of the preform is easily flown to the bulging portions 15 of the molding dies 11 and 12, and the protruding portions 2 can be formed without causing cracks or the like. Can be molded.
（ｅ）成形型１１，１２の型締め時にキャビティ１３内において、予備成形体（ワークＷ）の予備突出部２ａ間の中間部ｍが放射方向内方に膨出されるようにしたので、液圧成形時に中間部ｍの肉が各角部に向かう、いわゆる肉寄せが生じ、予備成形体の素材が円滑に流動され、予備突出部２ａを成形型１１，１２の膨出部１５に沿った形状に容易に成形することができる。 (E) Since the intermediate portion m between the preliminary projecting portions 2a of the preform (work W) is bulged radially inward in the cavity 13 when the molds 11 and 12 are clamped. During molding, so-called meat gathering occurs in which the meat of the intermediate part m is directed to each corner, the raw material of the preformed body is smoothly flowed, and the preliminary projecting part 2a is shaped along the bulging part 15 of the molds 11 and 12 Can be easily molded.
（ｆ）成形型１１，１２は、長手方向に直交する断面が矩形状を呈するキャビティ１３における４つの角部１４の内の対向する角部１４ｂ、１４ｄが、成形型１１，１２の合わせ面を跨って形成されているので、上下の成形型１１，１２に対して、液圧負荷前の予備成形体（ワークＷ）を斜めに傾斜させてセットすることになるが、一方向から型締めした状態での液圧成形が可能となる。また、成形後のワークＷの取り出しも容易に行うことができる。 (F) In the molds 11 and 12, the opposite corners 14b and 14d of the four corners 14 in the cavity 13 whose section perpendicular to the longitudinal direction is rectangular form the mating surfaces of the molds 11 and 12. Since it is formed over the upper and lower molds 11 and 12, the preform (work W) before the hydraulic load is inclined and set, but the mold is clamped from one direction. It is possible to perform hydraulic forming in a state. Further, the workpiece W after molding can be easily taken out.
本発明は、上述した実施形態に限定されるものではなく、特許請求の範囲内において種々変更使用することができる。例えば、上述した実施形態のチューブ部材は、断面４角形をしたものであるが、これのみでなく、角部を有するものであればどのようなものであってもよく、断面多角形をしたものであってもよい。 The present invention is not limited to the above-described embodiments, and various modifications can be used within the scope of the claims. For example, the tube member of the above-described embodiment has a quadrangular cross section, but not only this, but any tube member having a corner may be used. It may be.
また、上述した実施形態では、軸直角断面矩形状をしたチューブ部材の軸線変形部Ｘにおける４つの角部全てに突出部を形成したものであるが、これのみでなく、少なくとも１つの角部に突出部を形成したものであってもよい。 Further, in the above-described embodiment, the projecting portions are formed at all four corners of the axial deformation portion X of the tube member having a rectangular shape perpendicular to the axis. However, not only this but also at least one corner. A protrusion may be formed.
曲げや捩りなどに対する剛性の高いサスペンションメンバー等の成形に利用できる。 It can be used to form suspension members with high rigidity against bending and twisting.
１…チューブ部材の角部、
２…突出部、
２ａ…予備突出部、
１３…キャビティ、
１４…キャビティの角部、
１５…キャビティの膨出部、
ｍ…中間部、
Ｔ（Ｔ１，Ｔ２，Ｔ３，Ｔ４）…チューブ部材。
1 ... Corner portion of tube member,
2 ... protruding part,
2a ... preliminary projection,
13 ... cavity,
14 ... corner of cavity,
15 ... the bulging part of the cavity,
m ... middle part,
T (T1, T2, T3, T4) ... Tube member.
Claims (4)
前記成形型の前記膨出部と前記放射方向の張り出し量が同じ予備突出部が前記角部の内の少なくとも１つに形成された、多角形状の閉断面を有するチューブ状の予備成形体を形成する工程と、 A tube-shaped preform having a polygonal closed cross-section is formed, in which at least one of the corners has a pre-projection part having the same radial projecting amount as the bulging part of the mold. And a process of
前記予備突出部が前記キャビティの前記膨出部内面に接するように前記予備成形体を前記成形型にセットする工程と、 Setting the preform to the mold so that the preliminary projection is in contact with the inner surface of the bulging portion of the cavity;
前記予備成形体内に液圧を供給し、前記予備成形体が前記成形型の前記キャビティに沿うように液圧成形する工程と、を有するチューブ部材の製造方法。 Supplying a hydraulic pressure into the preform and hydroforming the preform along the cavity of the mold.
前記予備成形体は、４角形状の閉断面を有するチューブ状であり、 The preform is in the form of a tube having a quadrangular closed cross section,
前記予備突出部が４つの前記角部のすべてに形成され、４つの前記予備突出部すべてが前記キャビティの前記膨出部内面に接するように前記予備成形体を前記成形型にセットすることを特徴とする請求項１に記載のチューブ部材の製造方法。 The preform is set on the mold so that the preliminary projections are formed on all four corners, and the four preliminary projections are all in contact with the inner surface of the bulging portion of the cavity. The manufacturing method of the tube member of Claim 1.
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| JP2010150202A JP5609322B2 (en) | 2010-06-30 | 2010-06-30 | Method for manufacturing tube member |
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| JP2010150202A JP5609322B2 (en) | 2010-06-30 | 2010-06-30 | Method for manufacturing tube member |
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| US6257035B1 (en) * | 1999-12-15 | 2001-07-10 | Ti Corporate Services Limited | Compressive hydroforming |
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