JP2005230897A - Method and device for manufacturing special shaped tube for car component - Google Patents
Method and device for manufacturing special shaped tube for car component Download PDFInfo
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Abstract
Description
本発明は、優れた曲げ強度と吸収エネルギー特性を有する自動車構造部材として使用する異形管を製造する方法および装置に関する。 The present invention relates to a method and an apparatus for manufacturing a deformed pipe used as an automobile structural member having excellent bending strength and absorbed energy characteristics.
従来から、自動車の側面衝突時のエネルギーを吸収して運転者や同乗者の安全を確保するために、ドア補強部材であるドアインパクトビームやピラー補強材として吸収エネルギー特性に優れた鋼製の構造部材が広く使用されている。バンパーにも同様の構造部材が用いられている。鋼板をプレス成形したものも使用されているが、適宜長さに切断された鋼管が用いられる場合が多い。
特に、ドアインパクトビームには、衝突時の安全性を確保するとともに軽量化を図るために、引張強さが1400N/mm2以上の超高張力鋼管が用いられている。
Conventionally, a steel structure with excellent absorbed energy characteristics as a door impact beam or pillar reinforcement, which is a door reinforcement member, in order to absorb the energy at the time of a side collision of an automobile and ensure the safety of the driver and passengers Members are widely used. A similar structural member is also used for the bumper. A steel plate that has been press-formed is also used, but a steel pipe cut to an appropriate length is often used.
In particular, for the door impact beam, an ultra-high strength steel pipe having a tensile strength of 1400 N / mm 2 or more is used in order to ensure safety at the time of collision and to reduce the weight.
自動車構造部材の軽量化のためには、肉厚の薄い材料を使用するか、断面積を小さくするか、あるいは軽量な材質に変更するか、等が考えられるが、断面積を小さくしたり、軽量な材質に変更したりすることで軽量化を図ると、吸収エネルギー特性が低下してしまう。このため、現実には設計段階で材料の強度向上と薄肉化を同時に検討している。
ところが、材料強度を向上させて薄肉化しても、薄肉化のために曲げ強度が低下するために局部的な変形や座屈が起きやすく、吸収エネルギー特性は向上しない。
In order to reduce the weight of automobile structural members, it may be possible to use a thin material, reduce the cross-sectional area, or change to a lighter material, etc., but reduce the cross-sectional area, If the weight is reduced by changing to a lighter material, the absorbed energy characteristic is lowered. For this reason, in reality, at the design stage, material strength and thinning are simultaneously considered.
However, even if the material strength is increased and the thickness is reduced, the bending strength is reduced due to the reduction in thickness, so that local deformation and buckling are likely to occur, and the absorbed energy characteristics are not improved.
そこで、曲げ強度を高め、局部的な変形や座屈を抑制して吸収エネルギー特性をより高めるために、断面形状が円形でなく、異形形状にした構造部材も提案されている。
例えば、特許文献1では、図1の(a)に示すような、ほぼ円形管の一部に対向する内向きの彎曲縁辺部を形成し、この両彎曲縁辺部と連続一体化して管内に凹部を形成した断面形状(以下、「ターンナップ形状」と称す。)としたドア補強材が提案されている。また、特許文献2では、図1の(b)に示すような、断面形状を縦長の楕円形状(以下、「オーバル形状」と称す。)とした自動車用構造部材が提案されている。
Therefore, in order to increase the bending strength and suppress the local deformation and buckling to further improve the absorbed energy characteristics, a structural member having an irregular shape instead of a circular cross-sectional shape has been proposed.
For example, in Patent Document 1, as shown in FIG. 1 (a), an inwardly curved edge portion facing a part of a substantially circular tube is formed, and a concave portion is formed in the tube by continuous integration with both the curved edge portions. There has been proposed a door reinforcing material having a cross-sectional shape (hereinafter referred to as a “turn-up shape”). Patent Document 2 proposes a structural member for an automobile having a vertically long elliptical shape (hereinafter referred to as “oval shape”) as shown in FIG.
一方で、自動車の燃費向上のために、自動車構成部材のより軽量化が求められており、補強用の構造部材にもより薄肉のものが要求されている。薄肉化すると、上記のように吸収エネルギーが低下するために、従来の円形管や、上記特許文献で提案された断面形状を有する異形管では、単純に高強度薄肉化対応のみで、吸収エネルギー特性を向上させることには限界があった。
本発明は、このような問題を解消すべく案出されたものであり、曲げ強度と吸収エネルギー特性を高くすることができる特殊形状の異形管を、簡便かつ低コストで製造する手段を提供することを目的とする。
On the other hand, in order to improve the fuel consumption of automobiles, automobile components are required to be lighter, and structural members for reinforcement are required to be thinner. When the wall thickness is reduced, the absorbed energy decreases as described above. Therefore, the conventional circular tube and the deformed tube having the cross-sectional shape proposed in the above-mentioned patent document simply absorbs the high-strength wall and absorbs energy characteristics. There was a limit to improving this.
The present invention has been devised to solve such a problem, and provides a simple and low-cost means for manufacturing a specially-shaped deformed tube capable of enhancing bending strength and absorbed energy characteristics. For the purpose.
本発明の自動車構造部材用異形管の製造方法は、その目的を達成するため、円形管から、横断面の外郭がほぼ台形状を示し、台形の短辺部に内向きの湾曲縁辺部が相対向して形成されるとともに、該湾曲縁辺部から連続して延びた袋部が台形内にその長辺部に対向して形成された異形管をロール成形する際、円形管を大小2種類の凸曲面よりなる断面にロール成形する第一工程と、前記2種類の凸曲面の内の曲率半径の大きい面の中央表面から円盤状ロールを当て前記曲率半径の大きい面を管の内側に窪ませるようにロール成形する第二工程と、中央が窪み樋状に湾曲した断面の両側にロールを当て樋状開口部を狭めて管外径を小さくロール成形する第三工程と、上ロールで上部を支えつつ左右テーパーロールを用いて左右辺部を側方から内側に押し込むとともに下ロールで底辺部を押し上げて異形台形管の底辺および斜辺をロール成形する第四工程からなることを特徴とする。 In order to achieve the object, the manufacturing method of the deformed pipe for automobile structural members of the present invention shows that the outer shape of the cross section is substantially trapezoidal from the circular pipe, and the inward curved edge is relative to the short side of the trapezoid. When the deformed tube formed in the trapezoidal shape and facing the long side is roll-formed, the circular tube is divided into two types of large and small. A first step of roll forming into a cross section formed of a convex curved surface, and a disk-shaped roll is applied from the center surface of the surface having a large curvature radius of the two types of convex curved surfaces to dent the surface having the large curvature radius inside the tube. The second step of roll forming, the third step of narrowing the saddle-shaped opening to reduce the outer diameter of the tube by applying the roll to both sides of the cross section curved in the shape of a bowl with a depression at the center, and the upper roll with the upper part Use left and right taper rolls while supporting the left and right sides from the side Characterized by comprising a base and the hypotenuse of the deformed trapezoidal tube pushes up the bottom part under the roll from the fourth step of roll forming with pushed into.
第一工程では、大小2種類の凸曲面の曲面長さを、異形台形管の湾曲縁辺部および袋部の周方向長さと、台形部の短辺部を除く周方向長さにほぼ適合するようにロール成形することが好ましい。
第四の工程の前に、テーパー部と湾曲部を有する左右ロールと第四工程で用いる下ロールの曲率半径よりも小さい曲率半径の湾曲部を有する下ロール、および第四工程で用いる上ロールよりも平坦幅の広い上ロールでロール成形する工程を挟んでも良い。
In the first step, the curved lengths of the two types of large and small convex curved surfaces are substantially matched to the circumferential length of the curved edge portion and bag portion of the deformed trapezoidal tube and the circumferential length excluding the short side portion of the trapezoidal portion. It is preferable to roll-form.
Before the fourth step, from the left and right rolls having a tapered portion and a curved portion, the lower roll having a curved portion having a curvature radius smaller than the radius of curvature of the lower roll used in the fourth step, and the upper roll used in the fourth step Alternatively, a step of roll forming with an upper roll having a wide flat width may be sandwiched.
本発明の自動車構造部材用異形管の製造装置は、素管の円周方向に配置された、曲率半径の大きい凹部をもつ凹型上ロールと曲率半径の小さい凹部をもつ凹型下ロールからなる第一成形スタンドと、同じく素管の円周方向に配置された、前記曲率半径の小さい凹部をもつ凹型下ロールと同じかそれよりも小さい曲率半径の凹部をもつ凹型下ロールと端部の曲率半径が小さい円盤状の凸型上ロールからなる第二成形スタンドと、第二成形スタンドの凹型下ロールと同程度の曲率半径の凹部をもつ凹型ロールが一対で左右に配置されている第三成形スタンドと、低部径よりも高部径の方が大きいテーパーロールが左右に配置されるとともに、平型上ロールと大きい曲率半径の凹型下ロールが上下に配置されている第四成形スタンドを備えていることを特徴とする。 An apparatus for producing a deformed pipe for automobile structural members according to the present invention includes a concave upper roll having a concave portion having a large curvature radius and a concave lower roll having a concave portion having a small curvature radius, which are arranged in the circumferential direction of the raw pipe. A molding stand, a concave lower roll having a concave portion with a curvature radius smaller than or equal to the concave lower roll having a concave portion with a small curvature radius, and a radius of curvature at the end, which are also arranged in the circumferential direction of the blank tube A second molding stand composed of a small disk-shaped convex upper roll, and a third molding stand in which a pair of concave rolls having concave portions with a radius of curvature similar to that of the concave lower roll of the second molding stand are arranged on the left and right; And a fourth forming stand in which a taper roll having a larger high part diameter than a low part diameter is arranged on the left and right, and a flat upper roll and a concave lower roll having a large curvature radius are arranged on the upper and lower sides. This The features.
第三の成形スタンドは左右ロールの他に、第二成形スタンドの凸型上ロール幅よりも平坦幅が狭い円盤状の平型上ロールと第二成形スタンドの凹型下ロールよりも小さい曲率半径の凹部をもつ凹型下ロールが上下に配置されていてもよい。
この場合、第三成形スタンドの平型上ロールは第四成形スタンドの平型上ロールよりも平坦幅が広く、凹型下ロールは第四成形スタンドの凹型下ロールよりも曲率半径が小さくされている。
In addition to the left and right rolls, the third forming stand has a disk-shaped flat upper roll whose flat width is narrower than the convex upper roll width of the second forming stand and a smaller radius of curvature than the concave lower roll of the second forming stand. A concave lower roll having a concave portion may be arranged vertically.
In this case, the flat upper roll of the third forming stand is wider than the flat upper roll of the fourth forming stand, and the concave lower roll has a smaller radius of curvature than the concave lower roll of the fourth forming stand. .
第三成形スタンドと第四成形スタンドの間に、中央部径よりも高部径の方が大きいテーパー部と中央部から底部にかけて湾曲した湾曲部を有するロールが左右に配置されるとともに、第三成形スタンドの平型上ロールよりも平坦幅が狭く第四成形スタンドの平型上ロールよりも広い平坦幅の平型上ロールと、第三成形スタンドの凹型下ロールと同等もしくは大きく第四成形スタンドの凹型下ロールよりも小さい曲率半径を有する凹型下ロールが上下に配置された成形スタンドを介在させても良い。 Between the third molding stand and the fourth molding stand, a roll having a tapered portion having a larger diameter than the central portion and a curved portion curved from the central portion to the bottom portion is disposed on the left and right, and the third A flat upper roll with a flat width that is narrower than the flat upper roll of the forming stand and wider than the flat upper roll of the fourth forming stand, and a fourth forming stand that is equal to or larger than the concave lower roll of the third forming stand. You may interpose the shaping | molding stand by which the concave lower roll which has a smaller curvature radius than this concave lower roll is arrange | positioned up and down.
本発明により、横断面の外郭がほぼ台形状を示し、台形の短辺部に内向きの湾曲縁辺部が相対向して形成されるとともに、この湾曲縁辺部から連続して延びた袋部が台形内にその長辺部に対向して形成された断面形状を有し、吸収エネルギー特性に優れた異形管を、1段当りの成形量を大きくとって少ない段数で成形することができる。
衝撃吸収エネルギーが高くなるので、自動車用構造部材として使用される異形管の薄肉化が可能になって、自動車の軽量化に大きくも寄与することになる。
According to the present invention, the outline of the cross section shows a substantially trapezoidal shape, inwardly curved edge portions are formed opposite to each other on the short side portion of the trapezoid, and the bag portion continuously extending from the curved edge portion is formed. A deformed tube having a cross-sectional shape formed in the trapezoid so as to face the long side portion and having excellent absorbed energy characteristics can be formed with a small number of steps by taking a large amount of forming per step.
Since the shock absorption energy becomes high, it is possible to reduce the thickness of the deformed pipe used as the structural member for the automobile, which greatly contributes to the weight reduction of the automobile.
本発明者等は、まず、自動車用構造部材として、曲げ強度と吸収エネルギー特性が最も高くなる断面形状について種々検討した。
その結果、図2(a)に示すように、横断面の外郭がほぼ台形状を示し、台形の短辺部に相対向する内向きの湾曲縁辺部c〜c’,d〜d’が形成されるとともに、該湾曲縁辺部c〜c’,d〜d’から連続して延びた袋部eが台形内にその先端aを台形の長辺部bに対向するように形成されたような断面形状を有する異形管を、前記台形の短辺部c,dで荷重を受けるように配置すると、曲げ強度や吸収エネルギーが最も高くなることを見出した。
The inventors of the present invention first studied various cross-sectional shapes having the highest bending strength and absorbed energy characteristics as structural members for automobiles.
As a result, as shown in FIG. 2A, the outline of the cross section is substantially trapezoidal, and inwardly curved edge portions c to c ′ and d to d ′ opposite to the short sides of the trapezoid are formed. In addition, the bag portion e continuously extending from the curved edge portions c to c ′ and d to d ′ is formed in the trapezoid so that the tip a thereof faces the long side portion b of the trapezoid. It has been found that when a deformed pipe having a cross-sectional shape is arranged so as to receive a load at the trapezoidal short sides c and d, the bending strength and the absorbed energy become the highest.
上記のような断面形状を有する異形管が、従来のような断面形状を有する異形管に比べて優位である理由は、次のように考えられる。
図2に示される方向に局部的に曲げ荷重を受けたとき、図2(a)に示す断面形状の異形管は図2(b)に示すような断面形状に変形する。まず、受けた荷重は、図に示す台形の長辺部bとそれに対向する袋部eの先端aが接触することにより支えられるため、変形し難くなる。次に湾曲縁辺部の先端c’,d’が互いに接触することにより、荷重による異形管の変形を抑制するとともに、ねじれを抑制する。また荷重を受けて袋部eが膨れることによるねじれ抑制作用もある。さらに、台形の長辺部aと袋部の先端bおよび湾曲縁辺部の先端c’,d’が互いに接触して支えあう作用により、図に示す斜辺部fおよびgの荷重方向に対する角度θ1,θ2が小さくなるように変形し、曲げ荷重に対する異形管、すなわち自動車用構造部材の強度および吸収エネルギーを高める作用を発揮する。
The reason why the deformed pipe having the above-described cross-sectional shape is superior to the conventional deformed pipe having the cross-sectional shape as described above is considered as follows.
When a bending load is locally applied in the direction shown in FIG. 2, the deformed pipe having the cross-sectional shape shown in FIG. 2 (a) is deformed into a cross-sectional shape as shown in FIG. 2 (b). First, since the received load is supported by the contact between the trapezoidal long side portion b shown in the figure and the tip end a of the bag portion e facing the trapezoidal long side portion b, the load is hardly deformed. Next, when the tips c ′ and d ′ of the curved edge contact each other, deformation of the deformed pipe due to the load is suppressed and twisting is suppressed. In addition, there is also an effect of suppressing torsion due to the bag portion e expanding under the load. Further, the trapezoidal long side portion a, the tip end b of the bag portion, and the tip ends c ′ and d ′ of the curved edge portion come into contact with each other to support each other, whereby the angle θ1, Deformation is performed so that θ2 becomes small, and the effect of increasing the strength and absorbed energy of the deformed tube against bending load, that is, the structural member for automobiles is exhibited.
これに対して、従来から補強部材等の自動車用構造部材として用いられている円形やオーバル形状のような単純な断面形状、あるいはターンナップ形状の断面形状では、曲げ強度,吸収エネルギーはさほど高くならない。すなわち、真円形状やオーバル形状のような単純な形状では、本発明品のように荷重を台形の長辺部bと袋部の先端aおよび湾曲縁辺部の先端c’,d’が互いに接触して支えるような構造でないために強度が弱く、吸収エネルギーも低い。ターンナップ形状では、上記aとbおよびc’とd’が接触して支えることによる強度向上効果は本発明品と同程度に期待できるが、全体がほぼ円形であるために外周部は横長に扁平しやすく、エネルギーを十分に吸収することは期待できない。
以上のように、本発明品の断面形状では受けた荷重を支える構造であるために強度が高くなり、また変形代が少ないので吸収エネルギーが大きくなっている。
On the other hand, bending strength and absorbed energy are not so high in a simple cross-sectional shape such as a circular or oval shape or a turn-up cross-sectional shape conventionally used as a structural member for automobiles such as a reinforcing member. . That is, in a simple shape such as a perfect circle shape or an oval shape, the trapezoidal long side portion b, the bag portion tip a and the curved edge portions c ′ and d ′ contact each other as in the present invention. Therefore, the strength is weak and the absorbed energy is low. In the turn-up shape, the strength improvement effect by a and b and c ′ and d ′ being in contact with each other can be expected to be the same as that of the present invention product. It is easy to flatten and cannot be expected to absorb enough energy.
As described above, the cross-sectional shape of the product of the present invention is a structure that supports the received load, so that the strength is high, and the amount of deformation is small, so the absorbed energy is large.
なお、底辺部と斜辺部の角度が小さくなるほど、荷重を支える力が弱く、しかも変形しやすいので吸収エネルギーも低くなるため、底辺部と斜辺部の角度は60度以上にすることが好ましい。
本発明で得られるような異形管からなる構造部材は、荷重を受ける方向により曲げ変形や吸収エネルギー特性が異なる。このため、曲げ特性が最大限発揮されるように方向性を持たせて配置することが必要になる。本発明で得られる異形管を使用した自動車用構造部材では、断面台形の短辺側で荷重を受けるように配置されることが好ましい。
The smaller the angle between the bottom side and the oblique side, the weaker the force to support the load, and the more easily deformed, the lower the absorbed energy. Therefore, the angle between the bottom side and the oblique side is preferably 60 degrees or more.
A structural member made of a deformed pipe as obtained in the present invention has different bending deformation and absorbed energy characteristics depending on the direction of receiving a load. For this reason, it is necessary to arrange them with directivity so that the bending characteristics are maximized. In the automotive structural member using the deformed pipe obtained in the present invention, it is preferable that the structural member is arranged so as to receive a load on the short side of the trapezoidal cross section.
自動車構造部材用の異形管は、次のような複数の成形工程を連続的に行うことによりなされる。
図3にしたがって、その過程を概略的に説明すると、(a)まず、高周波溶接法等で溶接された鋼管を準備し、(b)第一工程として、異形台形管の湾曲縁辺部および袋部の周方向長さと、台形部の短辺部を除く周方向長さにほぼ適合するように円弧の半径ならびに角度を設定した大小2種類の凸曲面よりなる断面にロール成形する。(c)その後、第二工程として、前記2種類の凸曲面の内の曲率半径の大きい面の中央表面から円盤状ロールを当て前記曲率半径の大きい面を管の内側に窪ませるようにロール成形する。(d)その後さらに、第三工程として、中央が窪み樋状に湾曲した断面の両側に凹型ロールを当て樋状開口部を狭めて管外径を小さくロール成形した後、(f)第四工程として、上ロールで上部を支えつつ左右テーパーロールを用いて左右辺部を側方から内側に押し込むとともに下ロールで底辺部を押し上げて異形台形管の底辺および斜辺をロール成形して,異形管を製造する。
第四工程の前に、テーパー部と湾曲部を有する左右ロールと平型上ロールおよび小さい曲率半径の湾曲部を有する下ロールでロール成形する工程(e)を挟んでも良い。
A deformed pipe for an automobile structural member is formed by continuously performing a plurality of molding processes as follows.
The process is schematically described with reference to FIG. 3. (A) First, a steel pipe welded by a high-frequency welding method or the like is prepared. (B) As a first step, a curved edge part and a bag part of a deformed trapezoidal pipe Are formed into a cross section composed of two types of large and small convex curved surfaces in which the radius and angle of the arc are set so as to substantially match the circumferential length of the trapezoidal portion and the circumferential length excluding the short side portion of the trapezoidal portion. (C) Thereafter, as a second step, roll forming is performed such that a disk-shaped roll is applied from the central surface of the two types of convex curved surfaces with a large radius of curvature so that the surface with the large radius of curvature is recessed inside the tube. To do. (D) After that, as a third step, a concave roll is applied to both sides of the cross-section of which the center is concave and curved to narrow the saddle-shaped opening to reduce the outer diameter of the tube, and (f) the fourth step The upper and lower sides of the deformed trapezoidal tube are formed by rolling the bottom and slant sides of the deformed trapezoidal tube by pushing the left and right sides inward from the side using the left and right taper rolls while supporting the upper part with the upper roll. To manufacture.
Before the fourth step, a step (e) of roll forming may be sandwiched between right and left rolls having a tapered portion and a curved portion, a flat upper roll, and a lower roll having a curved portion having a small curvature radius.
上記各過程で使用される成形スタンドについて、図4,5を参考にしながら、使用するロール形状等を詳細に説明する。
第一の成形工程にあっては、素管Mを、曲率半径の大きい凹みをもつ凹型上ロール11とそれよりも曲率半径の小さい凹型下ロール12とからなる成形スタンドを通す。
次に第二の成形工程にあっては、素管Mは、前記第一の成形工程で使用した凹型下ロール12と同じかそれよりも小さい曲率半径の凹部をもつ凹型下ロール22と端部の曲率半径が小さい円盤状の凸型上ロール21とからなる成形スタンド間を、第一の成形工程で大きい曲率半径で形成された凸曲面中央に前記円盤状の凸型上ロール21を押付けるように通す。この段階での素管の断面は、中央が窪み樋状に湾曲した断面が横長の形状となっている。
Regarding the forming stand used in each of the above processes, the roll shape and the like to be used will be described in detail with reference to FIGS.
In the first forming step, the raw tube M is passed through a forming stand comprising a concave
Next, in the second molding step, the base tube M has an end portion with a concave
そこで、横幅を小さくすることが必要になる。第三の成形工程においては、第二工程で下ロールとして使用した凹型ロールと同程度の曲率半径の凹部を有する一対の凹型サイドロール31,32が配置されている成形スタンド間を通し、樋状開口部を狭めて管外径を小さくする。
この際、第二成形スタンドの凸型上ロール幅よりも平坦幅が狭い円盤状の平型上ロール33と第二成形スタンドの凹型下ロール22よりも小さい曲率半径の凹部をもつ凹型下ロール34が上下に配置されている成形スタンド間を通すと、素管の全外周が左右および上下の4ロールで拘束され、割れや肉余り等を発生させることなく形状精度に優れた異形管が成形できる。
Therefore, it is necessary to reduce the lateral width. In the third molding step, a pair of concave side rolls 31 and 32 having concave portions with the same radius of curvature as the concave roll used as the lower roll in the second step is passed between the molding stands, Narrow the opening to reduce the tube outer diameter.
At this time, a disk-shaped flat
最後の第四工程として、低部径よりも高部径の方が大きいテーパーロール41,42が左右に配置されるとともに、第三成形スタンドの平型上ロール33の平坦幅よりも狭い平坦幅の平型上ロール43と第三成形スタンドの凹型下ロール34よりも曲率半径が大きい凹型下ロール44を上下に配置されている成形スタンド間を通し、左右辺部を側方から内側に押し込むとともに下ロールで底辺部を押し上げて断面台形の底辺および斜辺を形作る。上ロールで支えつつ、左右および下からロールで押圧する形態となるので、袋部を有するほぼ台形外郭の断面形状に逐次変形される。
As the final fourth step, the taper rolls 41 and 42 having a larger part diameter than the lower part diameter are arranged on the left and right, and the flat width is narrower than the flat width of the flat
第三成形スタンドと第四成形スタンドの間に、中央部径よりも高部径の方が大きいテーパー部と中央部から底部にかけて湾曲した湾曲部を有するロール51,52が左右に配置配置された成形スタンド間を通して、第四工程での変形量を少なくしても良い。
この際も、第三成形スタンドと同様に、平坦幅が第三成形スタンドの平型上ロール33の平坦幅よりも狭く第四成形スタンドの平型上ロール43の平坦幅よりも広い平型上ロール53と、第三成形スタンドの凹型下ロール34と同等もしくは大きく第四成形スタンドの凹型下ロール44よりも小さい曲率半径を有する凹型下ロール54を上下に配置されている成形スタンド間を通すと、素管の全外周が左右および上下の4ロールで拘束され、割れや肉余り等を発生させることなく形状精度に優れた異形管が成形できる。
Between the third molding stand and the fourth molding stand, rolls 51 and 52 having a tapered portion having a larger diameter than the central portion and a curved portion curved from the central portion to the bottom portion are arranged on the left and right. The amount of deformation in the fourth step may be reduced between the molding stands.
Also in this case, like the third molding stand, the flat width is narrower than the flat width of the flat
肉厚1.00mm,降伏点900N/mm2,引張強さ980N/mm2,全伸び20%の冷間圧延材をベースとして外径54.0mmの円形管を高周波溶接法で造管し、連続的の本発明法に従ってロール成形した。
第一工程では、異形台形管の湾曲縁辺部および袋部の周方向長さと、台形部の短辺部を除く周方向長さとほぼ適合するように、上部の円周方向長さが70mm,曲率半径150mmの凹型の上ロールと、下部の円周方向長さが99.4mm,曲率半径40mmの凹型の下ロールを用いて、円弧を2つ上下に繋げた扁平な断面形状に成形した。
Thickness 1.00 mm, a circular tube of outer diameter 54.0mm and pipe formation by high frequency welding method yield point 900 N / mm 2, a tensile strength of 980 N / mm 2, a total elongation of 20% cold rolled material as a base, Rolled according to the continuous process of the present invention.
In the first step, the circumferential length of the upper portion is 70 mm, the curvature is substantially matched with the circumferential length of the curved edge portion and bag portion of the deformed trapezoidal tube and the circumferential length excluding the short side portion of the trapezoidal portion. Using a concave upper roll having a radius of 150 mm and a concave lower roll having a lower circumferential length of 99.4 mm and a curvature radius of 40 mm, a flat cross-sectional shape in which two circular arcs are connected vertically is formed.
第二工程では、曲率半径50mmの凸型上ロールと、曲率半径150mmの凹型下ロールを用いて、第一工程品の断面上半分が凹形状になるようにロール成形した。
第三工程では、平坦幅が10mmの平型ロールを上ロールに、曲率半径30mmで幅が8mmの凹型ロールを下ロールにして、曲率半径150mmの凹型ロールをサイドロールとして使用して、第二工程品を上下で支えつつ、断面下半分を左右から上方向に押し上げることで、異形台形の袋部分および異形台形の辺部分の粗形状を成形した。
In the second step, roll forming was performed using a convex upper roll having a curvature radius of 50 mm and a concave lower roll having a curvature radius of 150 mm so that the upper half of the cross section of the first process product had a concave shape.
In the third step, a flat roll having a flat width of 10 mm is used as an upper roll, a concave roll having a curvature radius of 30 mm and a width of 8 mm is used as a lower roll, and a concave roll having a curvature radius of 150 mm is used as a side roll. While supporting the process product up and down, the lower half of the cross section was pushed upward from the left and right, thereby forming the rough shape of the bag portion of the irregular trapezoid and the side portion of the irregular trapezoid.
次に、付加工程では、平坦幅が10mmの平型ロールを上ロールに、曲率半径30mmで幅が8mmの凹型ロールを下ロールとして使用し、さらに曲率半径150mmの凹型ロールをサイドロールとして使用して異形台形の辺部分を粗成形した。
その後、第四工程として、上端部の径が145mm,下端部の径が120mmで高さが32mmのテーパーロールをサイドロールとし、平坦幅が7mmの平型ロールを上ロールに、曲率半径300mmで幅が40mmの凹型ロールを下ロールに使用して、異形台形の斜辺部分を内側に押圧しつつ底辺部分を押し上げ、断面異形台形を形作った。
Next, in the additional step, a flat roll having a flat width of 10 mm is used as the upper roll, a concave roll having a curvature radius of 30 mm and a width of 8 mm is used as the lower roll, and a concave roll having a curvature radius of 150 mm is used as the side roll. The sides of the irregular trapezoid were roughly molded.
Thereafter, as a fourth step, a taper roll having an upper end diameter of 145 mm, a lower end diameter of 120 mm and a height of 32 mm is used as a side roll, a flat roll having a flat width of 7 mm is used as an upper roll, and a curvature radius is 300 mm. A concave roll having a width of 40 mm was used as the lower roll, and the bottom part was pushed up while pressing the hypotenuse part of the deformed trapezoid inward to form a deformed trapezoidal section.
以上の各工程でロール成形された異形台形状管の最終的な断面形状は、底面が31.8mm,高さが31.8mm,断面線長が166.5mm(管内部の袋部分の断面線長が63mm,管外側の台形部分の断面線長が103.5mm)、底辺と斜辺の角度が75度を有するものであった。
この異形台形管を所定長さに裁断し、曲げ評価特性試験を行った。曲げ評価特性試験は、図6に示すように、肩R10mmでスパン1000mmの支点間に試験片を異形台形の短辺部を上にして載せ、その長手方向中央部に、R100mmで幅40mmのパンチを30mm/minの一定の速度で150mm押し込んだときの吸収エネルギー量で評価を行った。
The final cross-sectional shape of the deformed trapezoidal tube roll-formed in the above steps is 31.8 mm at the bottom, 31.8 mm in height, and 166.5 mm in cross-sectional line length (the cross-sectional line of the bag portion inside the tube). The length was 63 mm, the cross-sectional line length of the trapezoidal portion outside the tube was 103.5 mm), and the angle between the base and the hypotenuse had 75 degrees.
This deformed trapezoidal tube was cut into a predetermined length and subjected to a bending evaluation characteristic test. As shown in FIG. 6, in the bending evaluation characteristic test, a test piece is placed between a fulcrum of a shoulder R of 10 mm and a span of 1000 mm with the short side portion of a deformed trapezoid facing upward, and a punch having a width of R 100 mm and a width of 40 mm is placed at the center in the longitudinal direction. Was evaluated by the amount of absorbed energy when 150 mm was pushed in at a constant speed of 30 mm / min.
なお、比較のために、従来材である引張強さ1470N/mm2,断面線長94.2mm,肉厚1.8mmの円形熱処理鋼管ならびに引張強さ980N/mm2の正方形管,オーバル型管,およびターンナップ型管についても同じ曲げ評価特性試験を行った。そしてこの際、いずれの管も従来材と同様もしくは従来材よりも軽量になるように断面線長および肉厚を選定した。
曲げ評価特性試験の結果を表1に示す。
For comparison, a conventional heat treated round heat-treated steel pipe having a tensile strength of 1470 N / mm 2 , a cross-sectional line length of 94.2 mm and a wall thickness of 1.8 mm, and a square pipe and an oval pipe having a tensile strength of 980 N / mm 2 are used. The same bending evaluation characteristic test was conducted for the turnup type tube. At this time, the cross-sectional line length and the wall thickness were selected so that all the tubes were the same as the conventional material or lighter than the conventional material.
Table 1 shows the results of the bending evaluation characteristic test.
表1では、試験No.2の従来材を基準として、製品重量および吸収エネルギーの点で従来材よりも優れるものを◎,劣るものを×で評価している。
比較例であるNo.4,5,6の正方形,オーバル型およびターンナップ型の管は、本発明品および従来品と同等な重量になるように肉厚および断面線長が選定されているため、重量的には問題はない。しかし、吸収エネルギー特性が従来品よりも劣っている。
これに対して、本発明方法で製造された異形台形状管は、従来品よりも軽量でありながら、従来品と比べて1割程度吸収エネルギーが増加している。
以上に説明したように、従来のターンナップ型管を製造する際のロール形状とロール配置形態を変更することにより、従来品と比べて軽量で吸収エネルギー特性に優れた自動車構造部材用異形管を低コストで製造することが可能となる。
In Table 1, test no. Based on the conventional material of No. 2, those that are superior to conventional materials in terms of product weight and absorbed energy are evaluated as ◎, and those that are inferior are evaluated as ×.
No. which is a comparative example. The thickness of the square, oval, and turn-up type tubes of 4, 5, and 6 are selected so that they have the same weight as that of the present invention and the conventional product. There is no. However, the absorbed energy characteristics are inferior to conventional products.
On the other hand, the deformed trapezoidal tube manufactured by the method of the present invention is lighter than the conventional product, but the absorbed energy is increased by about 10% compared to the conventional product.
As described above, by changing the roll shape and roll arrangement form when manufacturing the conventional turn-up type pipe, the modified pipe for automobile structural member that is lighter in weight and superior in absorbed energy characteristics than the conventional product It becomes possible to manufacture at low cost.
Claims (6)
Between the third molding stand and the fourth molding stand, a roll having a tapered portion having a larger diameter than the central portion and a curved portion curved from the central portion to the bottom portion is disposed on the left and right, and the third A flat upper roll with a flat width that is narrower than the flat upper roll of the forming stand and wider than the flat upper roll of the fourth forming stand, and a fourth forming stand that is equal to or larger than the concave lower roll of the third forming stand. The manufacturing apparatus of the deformed pipe | tube for motor vehicle structural members of Claim 4 or 5 in which the shaping | molding stand by which the concave lower roll which has a smaller curvature radius than the concave lower roll of this is arrange | positioned up and down is interposed.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2009274658A (en) * | 2008-05-16 | 2009-11-26 | Toyota Motor Corp | Vehicle body side structure |
CN102091730A (en) * | 2010-11-30 | 2011-06-15 | 重庆建设摩托车股份有限公司 | Bending method used in fabrication of metal elbow pipe |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2009274658A (en) * | 2008-05-16 | 2009-11-26 | Toyota Motor Corp | Vehicle body side structure |
CN102091730A (en) * | 2010-11-30 | 2011-06-15 | 重庆建设摩托车股份有限公司 | Bending method used in fabrication of metal elbow pipe |
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