JP4402474B2 - Stretch molding method - Google Patents

Stretch molding method Download PDF

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JP4402474B2
JP4402474B2 JP2004038773A JP2004038773A JP4402474B2 JP 4402474 B2 JP4402474 B2 JP 4402474B2 JP 2004038773 A JP2004038773 A JP 2004038773A JP 2004038773 A JP2004038773 A JP 2004038773A JP 4402474 B2 JP4402474 B2 JP 4402474B2
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intermediate workpiece
molding
workpiece
stretch
mold
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仙夫 石田
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Subaru Corp
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Fuji Jukogyo KK
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Description

本発明は、ストレッチ成形方法に関し、特に、一枚の平坦な板金材料を湾曲させて形成される断面U字状の湾曲部をさらに他の方向に湾曲させることにより、複合曲面を有する板金部品を得るストレッチ成形方法に関する。   The present invention relates to a stretch molding method, and in particular, a sheet metal part having a composite curved surface by bending a curved portion having a U-shaped cross section formed by bending a flat sheet metal material in another direction. The present invention relates to a stretch molding method.

従来より、ストレッチ加工を施して板金材料を大きく湾曲させることによって航空機のエンジンナセル表面板等の板金部品を得る技術が種々提案されている。例えば、所望の成形面を有するかまぼこ形の成形型と、この成形型の上に配置された断面U字状の被加工材の両端を固定する固定手段と、被加工材の両端に引張力を作用させるように成形型を変位させる駆動手段と、を有するストレッチ成形装置を用いたストレッチ成形方法が提案されている(特許文献1参照。)。   Conventionally, various techniques for obtaining sheet metal parts such as an engine nacelle surface sheet of an aircraft by bending a sheet metal material greatly by performing a stretch process have been proposed. For example, a kamaboko-shaped mold having a desired molding surface, fixing means for fixing both ends of a workpiece having a U-shaped cross section disposed on the mold, and tensile force at both ends of the workpiece. There has been proposed a stretch molding method using a stretch molding apparatus having a driving means for displacing a mold so as to act (see Patent Document 1).

前記した特許文献1に記載のストレッチ成形装置を用いると、大掛かりな駆動機構が不要となるとともに比較的高精度の加工を実現させることができる。しかし、特許文献1に記載のストレッチ成形装置は、断面U字状の被加工材の両端に下方への引張力を作用させて単純成形を行うものであるため、複合曲面を有する板金部品の成形には使用することができない。   When the stretch molding apparatus described in Patent Document 1 described above is used, a large-scale drive mechanism is not required and relatively high-precision processing can be realized. However, since the stretch molding apparatus described in Patent Document 1 performs simple molding by applying a downward tensile force to both ends of a workpiece having a U-shaped cross section, molding a sheet metal part having a composite curved surface. Can not be used.

このため、近年においては、図11(a)に示した断面U字状の被加工材100の左右方向両端部における対向面101、102を相互に近接させるように潰して図11(b)に示すような中間加工材110を形成し、この中間加工材110をさらに上下方向又は前後方向に湾曲させて複合曲面を形成する方法が提案されている。   For this reason, in recent years, the opposing surfaces 101 and 102 at both ends in the left-right direction of the workpiece 100 having a U-shaped cross section shown in FIG. There has been proposed a method of forming a composite curved surface by forming an intermediate processed material 110 as shown, and further bending the intermediate processed material 110 in the vertical direction or the front-rear direction.

かかる成形方法の一例を、図12を用いて説明する。まず、図12(a)に示すように、中間加工材110を上下方向に湾曲させるような成形面210を有する成形型200の上に、中間加工材110を配置する。次いで、図12(b)に示すように中間加工材110の左右方向両端部111をストレッチアーム300で把持して斜め下方に引っ張ることにより、中間加工材110の左右方向中央部112を成形型200の成形面210に押し付けて複合曲面を形成する。その後、図12(c)に示した中間加工材110の左右方向中央部112から、この左右方向中央部112に連接する両端部分120を切り離すことにより、図12(d)に示した複合曲面を有する板金部品130を得る。
特開2002−282953号公報(第2頁、第2図)
An example of such a molding method will be described with reference to FIG. First, as shown in FIG. 12A, the intermediate workpiece 110 is disposed on a molding die 200 having a molding surface 210 that curves the intermediate workpiece 110 in the vertical direction. Next, as shown in FIG. 12B, the left and right end portions 111 of the intermediate workpiece 110 are gripped by the stretch arm 300 and pulled obliquely downward, whereby the left and right center portion 112 of the intermediate workpiece 110 is formed into the molding die 200. To form a composite curved surface. Thereafter, the composite curved surface shown in FIG. 12 (d) is separated from the left and right central portion 112 of the intermediate workpiece 110 shown in FIG. 12 (c) by separating both end portions 120 connected to the horizontal central portion 112. The sheet metal part 130 having is obtained.
Japanese Patent Laid-Open No. 2002-282951 (2nd page, FIG. 2)

前記した成形方法は、中間加工材110の左右方向中央部112を成形型200に押し付けながら左右方向両端部111に引張力を作用させる(ストレッチ加工を施す)ことにより所望の複合曲面を形成するものであるが、実際の加工時には、成形型200の成形面210に合わせて引張力の方向及び大きさを設定することが困難であった。   In the molding method described above, a desired composite curved surface is formed by applying a tensile force to both ends 111 in the left and right direction (stretching) while pressing the center portion 112 in the left and right direction of the intermediate workpiece 110 against the mold 200. However, at the time of actual processing, it is difficult to set the direction and size of the tensile force in accordance with the molding surface 210 of the mold 200.

このため、前記した成形方法を採用すると、図12(b)に示すように、中間加工材110の左右方向中央部112の面が局所的に圧縮されて無数の小さい皺Wが形成されてしまうことがある。従来は、このような皺Wをゴムハンマ等で叩いて延ばしていたため、図12(d)に示すように叩いた痕跡Tや歪みが板金部品130の上面に残り、品質が低下してしまうという問題があった。   For this reason, when the above-described forming method is adopted, as shown in FIG. 12B, the surface of the central portion 112 in the left-right direction of the intermediate workpiece 110 is locally compressed to form innumerable small ridges W. Sometimes. Conventionally, since such ridges W were stretched by hitting them with a rubber hammer or the like, the traces T and distortion as struck remain on the upper surface of the sheet metal part 130 as shown in FIG. was there.

本発明の課題は、平坦な板金材料を湾曲させて形成した断面U字状の湾曲部を有する中間加工材を用いて、複合曲面を有する板金部品を得るストレッチ成形方法において、ストレッチ加工時に形成された皺を消失させることにより、痕跡や歪みのない高品質の板金部品を成形することである。   An object of the present invention is to form a sheet metal part having a composite curved surface by using an intermediate work material having a curved portion with a U-shaped cross section formed by curving a flat sheet metal material. By eliminating the wrinkles, high quality sheet metal parts without traces and distortions are formed.

以上の課題を解決するために、請求項1に記載の発明は、一枚の平坦な板金材料を2軸回りに湾曲させることにより、複合曲面を有する断面U字状の板金部品を成形するストレッチ成形方法であって、前記板金材料を第1の軸回りに一様な曲げ半径で湾曲させることにより断面U字状かつ単曲面の湾曲部を形成するとともに、前記第1の軸方向の両端部で所定長さに亘って対向する面を相互に近接させるように潰して中間加工材を形成する中間加工材形成工程と、所望の成形面を有する成形型を一対の引張治具の間に配置する成形型配置工程と、前記成形型を前記中間加工材の湾曲部の内側に挿入し、前記成形面に前記中間加工材の湾曲部の内側面を部分的に密着させるように配置するとともに、前記成形型を支持する中間加工材配置工程と、前記中間加工材の前記第1の軸方向の両端部を前記引張治具で挟持して前記成形面に沿わせて斜めに引っ張ることにより、前記中間加工材を第2の軸回りに湾曲させる中間加工材引張工程と、前記引張治具による引張りを継続しながら、前記成形型と前記引張治具との間に位置する前記中間加工材の部分を、前記引張治具とは異なる挟圧治具で挟み込むとともに対向面を相互に近接させる方向に押圧する中間加工材挟圧工程と、を備えることを特徴とする。   In order to solve the above problems, the invention according to claim 1 is a stretch for forming a sheet metal part having a U-shaped cross section having a compound curved surface by curving one flat sheet metal material around two axes. In the molding method, the sheet metal material is curved with a uniform bending radius around a first axis to form a curved portion having a U-shaped cross section and a single curved surface, and both end portions in the first axial direction The intermediate work material forming step of forming the intermediate work material by crushing the faces facing each other over a predetermined length to each other, and a mold having a desired forming surface are arranged between a pair of tension jigs And a mold placement step to insert the mold inside the curved portion of the intermediate workpiece, and arrange the inner surface of the curved portion of the intermediate workpiece partially in close contact with the molding surface, An intermediate workpiece placement step for supporting the mold; An intermediate portion in which the intermediate workpiece is bent around the second axis by sandwiching both ends of the intermediate workpiece in the first axial direction with the tension jig and pulling the intermediate workpiece along the molding surface obliquely. While maintaining the workpiece tensioning step and the tension jig, the intermediate workpiece positioned between the mold and the tension jig is different from the tension jig. And an intermediate workpiece clamping step of pressing in the direction in which the opposing surfaces are brought close to each other.

請求項1に記載の発明によれば、所望の成形面を有する成形型を一対の引張治具の間に配置し、この成形型の成形面に中間加工材の湾曲部の内側面を密着させるように配置し、中間加工材の第1の軸方向の両端部を引張治具で挟持して、成形型の成形面に沿わせて斜めに引っ張ることにより第2の軸回りに湾曲させる。その後、中間加工材の中間部(成形型と引張治具との間に位置する部分)を、引張治具とは異なる挟圧治具で挟み込むとともに対向面を相互に近接させる方向に押圧する。   According to the first aspect of the present invention, a mold having a desired molding surface is disposed between a pair of tension jigs, and the inner surface of the curved portion of the intermediate workpiece is brought into close contact with the molding surface of the mold. The both ends in the first axial direction of the intermediate workpiece are sandwiched by a tension jig, and are bent around the second axis by pulling diagonally along the molding surface of the mold. Thereafter, the intermediate portion of the intermediate workpiece (the portion located between the mold and the tension jig) is sandwiched by a clamping jig different from the tension jig and pressed in the direction in which the opposing surfaces are close to each other.

すなわち、中間加工材の第1の軸方向の両端部を成形型の成形面に沿わせて引っ張ることにより第2の軸回りに湾曲させる「ストレッチ加工」を施した後に、挟圧治具を用いて中間加工材の中間部を絞るため、中間加工材の第1の軸方向における中央部の面に形成された皺を消失させることができる。従って、皺を叩いて延ばす必要がないので、中間加工材に従来形成されていた痕跡や歪みをなくすことができる。この結果、高品質の板金部品を得ることができる。   That is, after performing “stretch processing” in which both end portions in the first axial direction of the intermediate workpiece are bent around the molding surface of the mold and then bent around the second axis, the clamping jig is used. Thus, since the intermediate portion of the intermediate workpiece is squeezed, wrinkles formed on the surface of the central portion in the first axial direction of the intermediate workpiece can be eliminated. Therefore, since it is not necessary to strike and extend the hook, it is possible to eliminate the traces and distortions conventionally formed in the intermediate workpiece. As a result, a high-quality sheet metal part can be obtained.

本発明によれば、成形型の成形面上に中間加工材を配置し、引張治具で中間加工材の第1の軸方向における両端部を挟持してストレッチ加工を施した後に、挟圧治具で中間加工材の中間部を絞るので、ストレッチ加工時に中間加工材に形成された皺を消失させることができる。従って、皺を叩いて延ばす必要がないので、痕跡や歪みのない高品質の板金部品を得ることができる。   According to the present invention, after the intermediate workpiece is disposed on the molding surface of the mold, the both ends in the first axial direction of the intermediate workpiece are clamped by the tension jig, and then stretch processing is performed. Since the intermediate portion of the intermediate processed material is squeezed with the tool, wrinkles formed on the intermediate processed material during stretch processing can be eliminated. Therefore, since it is not necessary to strike and extend the hook, it is possible to obtain a high-quality sheet metal part having no trace or distortion.

以下、本発明の実施の形態を、図を用いて詳細に説明する。本実施の形態に係るストレッチ成形方法は、図1〜図5に示した絞り機10と、図6及び図7に示した成形型20と、図6〜図8に示した一対のストレッチアーム31、32を有するストレッチ加工機と、を用いて、図11(b)の中間加工材110にストレッチ加工等を施すことにより、図10に示した複合曲面を有する板金部品1を得る方法である。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The stretch molding method according to the present embodiment includes a drawing machine 10 shown in FIGS. 1 to 5, a molding die 20 shown in FIGS. 6 and 7, and a pair of stretch arms 31 shown in FIGS. 6 to 8. , 32 is used to stretch the intermediate work material 110 of FIG. 11B and the like to obtain the sheet metal part 1 having the composite curved surface shown in FIG.

なお、図11(b)に示した中間加工材110は、一枚の板金材料を、左右方向に延在する第1の軸回りに湾曲させて図11(a)に示した断面U字状の湾曲部を有する被加工材100を形成し、この被加工材100の左右方向両端部における対向面101、102を相互に近接させるように潰して形成したものである。   The intermediate workpiece 110 shown in FIG. 11 (b) is a U-shaped cross section shown in FIG. 11 (a) by curving one sheet metal material around a first axis extending in the left-right direction. The workpiece 100 having a curved portion is formed, and the opposing surfaces 101 and 102 at the left and right ends of the workpiece 100 are crushed so as to be close to each other.

まず、図1〜図8を用いて、本実施の形態に係るストレッチ成形方法で使用される絞り機10、成形型20及びストレッチ加工機について説明する。   First, the drawing machine 10, the shaping | molding die 20, and the stretch processing machine used with the stretch molding method which concerns on this Embodiment are demonstrated using FIGS.

絞り機10は、本発明における挟圧治具であり、成形の最終工程で被成形品の両端部を挟みつけて被成形品の中央部を延ばし、ストレッチ加工時に形成された皺や歪みを消失させるものである。絞り機10は、図1及び図2に示すように、略平行に配置される長尺矩形柱状の第1アーム11及び第2アーム12、これら2本のアームの一方の端部が取り付けられる断面コ字状のチャンネル13、外周に雄ネジ部が設けられた長尺のネジ付ロッド14、ネジ付ロッド14に取り付けられるハンドル15、等を備えて構成されている。   The squeezing machine 10 is a clamping tool in the present invention, and sandwiches both end portions of the molded product in the final molding process to extend the central portion of the molded product, thereby eliminating wrinkles and distortions formed during stretch processing. It is something to be made. As shown in FIG. 1 and FIG. 2, the diaphragm 10 has a long rectangular columnar first arm 11 and a second arm 12 arranged substantially in parallel, and a cross section to which one end of these two arms is attached. A U-shaped channel 13, a long threaded rod 14 provided with a male thread portion on the outer periphery, a handle 15 attached to the threaded rod 14, and the like are configured.

第1アーム11の一方の端部と、この端部を挟むように設けられたチャンネル13の相対する2つの面と、には、図2に示すようにボルト用貫通孔11a、13aが穿設されている。そして、チャンネル13のボルト用貫通孔13aに第1アーム11のボルト用貫通孔11aを重ね、これらボルト用貫通孔11a、13aにボルト16を通してワッシャ17、18及びナット19を用いて締結することにより、第1アーム11の一方の端部がチャンネル13に取り付けられている。この際、第1アーム11がチャンネル13に対して回動するようにボルト16及びナット19の締め付け具合を調整する。また、第2アーム12の一方の端部をチャンネル13に取り付ける際にも同様の方法を採用している。   As shown in FIG. 2, bolt through-holes 11a and 13a are formed in one end of the first arm 11 and two opposite faces of the channel 13 provided so as to sandwich the end. Has been. Then, the bolt through hole 11a of the first arm 11 is overlapped with the bolt through hole 13a of the channel 13, and the bolt through hole 11a, 13a is passed through the bolt 16 and fastened using the washers 17, 18 and the nut 19. One end of the first arm 11 is attached to the channel 13. At this time, the tightening degree of the bolt 16 and the nut 19 is adjusted so that the first arm 11 rotates with respect to the channel 13. The same method is adopted when one end of the second arm 12 is attached to the channel 13.

また、図5に示すように、第1アーム11の他方の端部には切り欠き部11bが設けられており、ネジ付ロッド14の断面矩形状の端部14aがこの切り欠き部11bに嵌め込まれる。また、第1アーム11の切り欠き部11bを構成する2片と、ネジ付ロッド14の端部14aと、には、(図示されていない)ボルト用貫通孔が穿設されている。そして、第1アーム11のボルト用貫通孔にネジ付ロッド14のボルト用貫通孔を重ね、これらボルト用貫通孔にボルト16を通してワッシャ17、18及びナット19を用いて締結することにより、ネジ付ロッド14の端部14aが第1アーム11に取り付けられている。また、図4に示すように、第2アーム12の他方の端部には長尺孔12aが設けられており、この長尺孔12aにネジ付ロッド14が通されるようになっている。   Further, as shown in FIG. 5, a notch portion 11b is provided at the other end portion of the first arm 11, and an end portion 14a having a rectangular cross section of the threaded rod 14 is fitted into the notch portion 11b. It is. In addition, bolt through holes (not shown) are formed in the two pieces constituting the cutout portion 11 b of the first arm 11 and the end portion 14 a of the threaded rod 14. Then, the bolt through hole for the screwed rod 14 is overlapped with the bolt through hole of the first arm 11, and the bolt 16 is passed through the bolt through hole and fastened with the washers 17, 18 and the nut 19. An end 14 a of the rod 14 is attached to the first arm 11. As shown in FIG. 4, a long hole 12a is provided at the other end of the second arm 12, and a threaded rod 14 is passed through the long hole 12a.

ハンドル15は、図1及び図3に示すように、ネジ付ロッド14の雄ネジに螺嵌されるナット15aと、このナット15aに設けられたアーム15bと、このアーム15bに回動自在に取り付けられた把持部15cと、から構成されている。   As shown in FIGS. 1 and 3, the handle 15 includes a nut 15a that is screwed onto the male screw of the threaded rod 14, an arm 15b provided on the nut 15a, and a pivotable attachment to the arm 15b. And a gripping portion 15c.

ハンドル15のナット15aをネジ付ロッド14の雄ネジ部に螺嵌させ、作業者がハンドル15の把持部15cを把持して回転させることにより、ハンドル15を第2アーム12側に移動させることができる。そして、ナット15aを第2アーム12に当接させた状態でさらにハンドル15を回転させることにより、ナット15aで第2アーム12を第1アーム11側に押圧して、第1アーム11と第2アーム12との間の寸法(以下「アーム間隔」という)を狭めることができる。なお、アーム間隔の最小値は、中間加工材110の板厚の約2倍に設定されている。   The nut 15a of the handle 15 is screwed into the male thread portion of the threaded rod 14, and the operator grips and rotates the grip portion 15c of the handle 15, thereby moving the handle 15 to the second arm 12 side. it can. Then, by further rotating the handle 15 with the nut 15a in contact with the second arm 12, the second arm 12 is pressed toward the first arm 11 with the nut 15a, and the first arm 11 and the second arm 12 are pressed. The dimension between the arms 12 (hereinafter referred to as “arm interval”) can be reduced. The minimum value of the arm interval is set to about twice the thickness of the intermediate workpiece 110.

成形型20は、中間加工材110の左右方向中央部を密着させて所望の複合曲面を形成するための成形面21を備えている。ここで「複合曲面」とは、一枚の平坦な板金材料を特定方向に延在する軸(第1の軸)回りに湾曲させるだけでなく、この軸に直交する軸(第2の軸)回りに湾曲させて形成した曲面を意味する。本実施の形態で使用する成形型20は、図11(b)に示した中間加工材110の湾曲部を前後方向に延在する第2の軸回りに湾曲させて左右方向中央部を図7に示すように上方に突出させるとともに、左右方向中央部における前後方向の面間距離を図8に示すように滑らかに変化させるように湾曲させる成形面21を採用している。成形型20は、金属材料、樹脂材料、繊維強化樹脂複合材等で構成することができる。   The molding die 20 includes a molding surface 21 for forming a desired composite curved surface by bringing the middle part of the intermediate workpiece 110 in the left-right direction into close contact. Here, the “composite curved surface” means that not only a single flat sheet metal material is curved around an axis (first axis) extending in a specific direction but also an axis (second axis) orthogonal to this axis. It means a curved surface formed by curving around. In the mold 20 used in the present embodiment, the curved portion of the intermediate workpiece 110 shown in FIG. 11 (b) is curved around the second axis extending in the front-rear direction, and the central portion in the left-right direction is shown in FIG. As shown in FIG. 8, a molding surface 21 is employed that is curved upward so that the distance between the front and rear surfaces at the center portion in the left and right direction is smoothly changed as shown in FIG. The mold 20 can be composed of a metal material, a resin material, a fiber reinforced resin composite material, or the like.

ストレッチ加工機は、成形型20が支持される(図示されていない)基台と、この基台を挟んで相対する位置に配置される一対のストレッチアーム31、32と、を有している。ストレッチアーム31、32は、本発明における引張治具であり、(図示されていない)駆動手段により駆動されて中間加工材110の左右方向両端部111を挟持した状態で斜め下方に移動することにより、中間加工材110に引張力を作用させる。   The stretch processing machine includes a base (not shown) on which the mold 20 is supported and a pair of stretch arms 31 and 32 disposed at positions facing each other with the base interposed therebetween. The stretch arms 31 and 32 are tension jigs in the present invention, and are driven by driving means (not shown) to move obliquely downward while sandwiching the left and right ends 111 of the intermediate workpiece 110. Then, a tensile force is applied to the intermediate workpiece 110.

次に、図6〜図10を用いて、本実施の形態に係るストレッチ成形方法について説明する。   Next, the stretch molding method according to the present embodiment will be described with reference to FIGS.

まず、図6に示すように、成形型20をストレッチアーム31、32の間に配置する(成形型配置工程)。次いで、図6に示すように、成形型20の成形面21の上端に中間加工材110の左右方向中央部112の内側面を密着させるように配置する(中間加工材配置工程)。   First, as shown in FIG. 6, the shaping | molding die 20 is arrange | positioned between the stretch arms 31 and 32 (molding die arrangement | positioning process). Next, as shown in FIG. 6, it arrange | positions so that the inner surface of the left-right direction center part 112 of the intermediate workpiece 110 may contact | adhere to the upper end of the molding surface 21 of the shaping | molding die 20 (intermediate workpiece arrangement process).

次いで、図7に示すように、中間加工材110の左右方向両端部111をストレッチアーム31、32で挟持して斜め下方へ引っ張る(中間加工材引張工程)。この中間加工材引張工程により、中間加工材110の左右方向中央部112が成形型20の成形面21に押し付けられて複合曲面が形成される。なお、中間加工材引張工程が完了した時点では、中間加工材110の左右方向中央部112の上面に無数の小さい皺が形成されている。   Next, as shown in FIG. 7, both end portions 111 in the left-right direction of the intermediate workpiece 110 are sandwiched between the stretch arms 31 and 32 and pulled obliquely downward (intermediate workpiece tension step). By this intermediate workpiece pulling step, the central portion 112 in the left-right direction of the intermediate workpiece 110 is pressed against the molding surface 21 of the mold 20 to form a composite curved surface. When the intermediate workpiece pulling step is completed, countless small wrinkles are formed on the upper surface of the central portion 112 in the left-right direction of the intermediate workpiece 110.

次いで、中間加工材110の左右方向中央部112(成形型20の成形面21に密着させた部分)と、左右方向両端部111(ストレッチアーム31、32で挟持された部分)と、の間に位置する中間部113を、図7及び図8に示すように絞り機10の第1アーム11及び第2アーム12で挟み込む。   Next, between the left-right direction center part 112 (part closely_contact | adhered to the molding surface 21 of the shaping | molding die 20) and the left-right direction both ends 111 (part clamped by the stretch arms 31 and 32) of the intermediate workpiece 110 The positioned intermediate portion 113 is sandwiched between the first arm 11 and the second arm 12 of the diaphragm 10 as shown in FIGS.

この際、チャンネル13に取り付けられた第1アーム11及び第2アーム12を相互に離隔させるように回動させてアーム間隔を広げた状態で中間部113を挟み込んだ後に、第2アーム12の長尺溝12aにネジ付ロッド14を通すようにする。また、図7に示すように、2つの絞り機10を成形型20の左右側壁に略平行に配置する。なお、図8においては、絞り機10のチャンネル13の図示を省略している。   At this time, the first arm 11 and the second arm 12 attached to the channel 13 are rotated so as to be separated from each other and the intermediate portion 113 is sandwiched in a state where the arm interval is widened, and then the length of the second arm 12 is increased. The threaded rod 14 is passed through the shank groove 12a. In addition, as shown in FIG. 7, the two diaphragms 10 are arranged substantially parallel to the left and right side walls of the mold 20. In FIG. 8, the channel 13 of the diaphragm 10 is not shown.

次いで、図7及び図8に示すように、絞り機10のネジ付ロッド14の雄ネジ部にハンドル15のナット15aを螺嵌させ、ハンドル15を回転させて第2アーム12側に移動させる。そして、ハンドル15のナット15aで第2アーム12を第1アーム11側に押圧してアーム間隔を狭めることにより、図8に示すように中間加工材110の中間部113の対向面を相互に近接させる方向に押圧する(中間加工材挟圧工程)。   Next, as shown in FIGS. 7 and 8, the nut 15 a of the handle 15 is screwed into the male thread portion of the threaded rod 14 of the drawing machine 10, and the handle 15 is rotated and moved to the second arm 12 side. Then, by pressing the second arm 12 toward the first arm 11 with the nut 15a of the handle 15 to narrow the arm interval, the opposing surfaces of the intermediate portion 113 of the intermediate workpiece 110 are brought close to each other as shown in FIG. It presses in the direction to make (intermediate work material pinching process).

この際、2つの絞り機10のハンドル15を同時に同じ速度で回転させることにより、アーム間隔を同時に同じ速度で狭めるようにする。このように2つの絞り機10によって中間加工材110の中間部113が挟圧されることにより、中間加工材引張工程で中間加工材110に形成された皺や歪みを消失させ、所望の複合曲面を得ることができる。中間加工材110の皺や歪みが消失した時点で、中間加工材挟圧工程を終了する。   At this time, the handles 15 of the two diaphragms 10 are simultaneously rotated at the same speed so that the arm interval is simultaneously reduced at the same speed. In this way, the intermediate portion 113 of the intermediate workpiece 110 is clamped by the two drawing machines 10 to eliminate wrinkles and distortions formed on the intermediate workpiece 110 in the intermediate workpiece tensioning step, and a desired composite curved surface. Can be obtained. When the wrinkles and distortion of the intermediate workpiece 110 disappear, the intermediate workpiece clamping process is terminated.

その後、図9に示した中間加工材110の左右方向中央部112から、この左右方向中央部112に連接する両端部分120を切り離すことにより、図10に示した複合曲面を有する板金部品1を得る。   After that, by separating the both end portions 120 connected to the left-right direction center portion 112 from the left-right direction center portion 112 of the intermediate workpiece 110 shown in FIG. 9, the sheet metal part 1 having the composite curved surface shown in FIG. 10 is obtained. .

以上説明した実施の形態に係るストレッチ成形方法においては、所望の成形面21を有する成形型20を一対のストレッチアーム31、32の間に配置し、この成形型20の成形面21に中間加工材110の左右方向中央部112の内側面を密着させるように配置し、中間加工材110の左右方向両端部111をストレッチアーム31、32で挟持して斜め下方へ引っ張る。その後、中間加工材110の中間部113を絞り機10の第1アーム11及び第2アーム12で挟み込むとともに、この中間部113における対向面を相互に近接させる方向に押圧する。   In the stretch molding method according to the embodiment described above, a molding die 20 having a desired molding surface 21 is disposed between a pair of stretch arms 31 and 32, and an intermediate workpiece is formed on the molding surface 21 of the molding die 20. The left and right end portions 111 of the intermediate workpiece 110 are sandwiched between the stretch arms 31 and 32 and pulled obliquely downward. Thereafter, the intermediate portion 113 of the intermediate workpiece 110 is sandwiched between the first arm 11 and the second arm 12 of the drawing machine 10 and pressed in a direction in which the opposing surfaces of the intermediate portion 113 are close to each other.

すなわち、中間加工材110の左右方向両端部111を斜め下方へ引っ張る「ストレッチ加工」を施した後に、絞り機10を用いて中間加工材110の中間部113を絞るため、中間加工材110の左右方向中央部112の上面に形成された皺を消失させることができる。従って、皺を叩いて延ばす必要がないので、中間加工材110に従来形成されていた痕跡や歪みをなくすことができる。この結果、高品質の板金部品1を得ることができる。   That is, after performing “stretching” in which the left and right end portions 111 of the intermediate workpiece 110 are obliquely pulled downward, the intermediate portion 113 of the intermediate workpiece 110 is squeezed using the drawing machine 10. The wrinkles formed on the upper surface of the direction center portion 112 can be eliminated. Therefore, since it is not necessary to strike and extend the hook, it is possible to eliminate the traces and distortions conventionally formed on the intermediate workpiece 110. As a result, a high-quality sheet metal part 1 can be obtained.

なお、以上の実施の形態においては、本発明における挟圧治具の一例として、2本のアーム、チャンネル、ネジ付ロッド等から構成される「絞り機10」を採用した例を示したが、挟圧治具の構成はこれに限られるものではなく、中間加工材110の中間部113を挟み込んで押圧する「中間加工材挟圧工程」を実現させるような構成であればいかなる構成を採用してもよい。   In the above embodiment, as an example of the clamping jig in the present invention, an example of adopting the “drawer 10” configured by two arms, a channel, a threaded rod, etc. has been shown. The configuration of the clamping jig is not limited to this, and any configuration may be adopted as long as it realizes an “intermediate workpiece clamping process” in which the intermediate portion 113 of the intermediate workpiece 110 is sandwiched and pressed. May be.

また、以上の実施の形態においては、図11(b)の中間加工材110を「上下方向」に湾曲させる場合(前後方向に延在する第2の軸回りに湾曲させる場合)に本発明に係るストレッチ成形方法を適用した例を示したが、中間加工材110を「前後方向」に湾曲させる場合(上下方向に延在する第2の軸回りに湾曲させる場合)においても、本発明に係るストレッチ成形方法を適用することができる。   Further, in the above embodiment, the present invention is applied to the case where the intermediate workpiece 110 of FIG. 11B is bent in the “vertical direction” (when it is bent around the second axis extending in the front-rear direction). Although an example in which such a stretch molding method is applied has been shown, even when the intermediate workpiece 110 is bent in the “front-rear direction” (when bent about the second axis extending in the vertical direction), the present invention also relates to the present invention. A stretch molding method can be applied.

本発明の実施の形態に係るストレッチ成形方法で使用される絞り機の構成を説明するための説明図である。It is explanatory drawing for demonstrating the structure of the drawing machine used with the stretch molding method which concerns on embodiment of this invention. 図1のII−II部分の断面図である。It is sectional drawing of the II-II part of FIG. 図1に示した絞り機のハンドルを矢印IIIの方向から見た図である。It is the figure which looked at the handle of the iris shown in Drawing 1 from the direction of arrow III. 図1のIV−IV部分の矢視図である。It is an arrow view of the IV-IV part of FIG. 図1のV−V部分の矢視図(一部断面図)である。It is an arrow view (partial sectional view) of the VV part of FIG. 本実施の形態に係るストレッチ成形方法の成形型配置工程及び中間加工材配置工程を説明するための説明図である。It is explanatory drawing for demonstrating the shaping | molding die arrangement | positioning process and intermediate work material arrangement | positioning process of the stretch molding method which concern on this Embodiment. 本実施の形態に係るストレッチ成形方法の中間加工材引張工程及び中間加工材挟圧工程を説明するための説明図である。It is explanatory drawing for demonstrating the intermediate work material tension | tensile_strength process and intermediate work material pinching process of the stretch molding method which concerns on this Embodiment. 図7に示した成形型、絞り機、中間加工材等を下方から見た図である。It is the figure which looked at the shaping | molding die, drawing machine, intermediate work material, etc. which were shown in FIG. 7 from the downward direction. 本実施の形態に係るストレッチ成形方法の中間加工材引張工程及び中間加工材挟圧工程を経て複合曲面が形成された中間加工材を示す図である。It is a figure which shows the intermediate process material in which the composite curved surface was formed through the intermediate process material tension | tensile_strength process and intermediate process material clamping pressure process of the stretch molding method which concerns on this Embodiment. 本実施の形態に係るストレッチ成形方法により成形された板金部品を示す図である。It is a figure which shows the sheet-metal component shape | molded by the stretch molding method which concerns on this Embodiment. (a)は平板材料を湾曲させて形成した断面U字状かつ単曲面の湾曲部を有する被加工材を示す斜視図であり、(b)は(a)に示した被加工材の左右方向両端部の対向面を相互に近接させるように潰して形成した中間加工材を示す斜視図である。(A) is a perspective view which shows the to-be-processed material which has the curved part of a U-shaped cross section and a single curved surface formed by curving a flat plate material, (b) is the left-right direction of the to-be-processed material shown to (a) It is a perspective view which shows the intermediate processing material formed by crushing so that the opposing surface of both ends may mutually adjoin. 従来のストレッチ成形方法の手順を説明するための説明図である。It is explanatory drawing for demonstrating the procedure of the conventional stretch molding method.

符号の説明Explanation of symbols

1 板金部品
10 絞り機(挟圧治具)
20 成形型
21 成形面
31 ストレッチアーム(引張治具)
32 ストレッチアーム(引張治具)
110 中間加工材
111 左右方向両端部(中間加工材の第1の軸方向の両端部)
113 中間部(成形型と引張治具との間に位置する中間加工材の部分)
1 Sheet metal parts 10 Drawing machine (clamping jig)
20 Mold 21 Molding surface 31 Stretch arm (Tension jig)
32 Stretch arm
110 Intermediate work material 111 Left and right direction both ends (both end parts of the first axial direction of the intermediate work material)
113 Intermediate part (the part of the intermediate processed material located between the mold and the tension jig)

Claims (1)

一枚の平坦な板金材料を2軸回りに湾曲させることにより、複合曲面を有する断面U字状の板金部品を成形するストレッチ成形方法であって、
前記板金材料を第1の軸回りに一様な曲げ半径で湾曲させることにより断面U字状かつ単曲面の湾曲部を形成するとともに、前記第1の軸方向の両端部で所定長さに亘って対向する面を相互に近接させるように潰して中間加工材を形成する中間加工材形成工程と、
所望の成形面を有する成形型を一対の引張治具の間に配置する成形型配置工程と、
前記成形型を前記中間加工材の湾曲部の内側に挿入し、前記成形面に前記中間加工材の湾曲部の内側面を部分的に密着させるように配置するとともに、前記成形型を支持する中間加工材配置工程と、
前記中間加工材の前記第1の軸方向の両端部を前記引張治具で挟持して前記成形面に沿わせて斜めに引っ張ることにより、前記中間加工材を第2の軸回りに湾曲させる中間加工材引張工程と、
前記引張治具による引張りを継続しながら、前記成形型と前記引張治具との間に位置する前記中間加工材の部分を、前記引張治具とは異なる挟圧治具で挟み込むとともに対向面を相互に近接させる方向に押圧する中間加工材挟圧工程と、
を備えることを特徴とするストレッチ成形方法。
It is a stretch molding method for molding a sheet metal part having a U-shaped cross section having a compound curved surface by curving one flat sheet metal material around two axes,
The sheet metal material is curved with a uniform bending radius around the first axis to form a curved portion having a U-shaped cross section and a single curved surface, and over a predetermined length at both ends in the first axial direction. An intermediate workpiece forming step of forming an intermediate workpiece by crushing the opposing surfaces close to each other,
A mold placement step of placing a mold having a desired molding surface between a pair of tension jigs;
The molding die is inserted inside the curved portion of the intermediate workpiece, and arranged so that the inner surface of the curved portion of the intermediate workpiece is partially in close contact with the molding surface, and the middle supporting the molding die Work material placement process,
An intermediate portion in which the intermediate workpiece is bent around the second axis by sandwiching both ends of the intermediate workpiece in the first axial direction with the tension jig and pulling the intermediate workpiece along the molding surface obliquely. Work material tensioning process;
While continuing the pulling by the pulling jig, the portion of the intermediate work material located between the mold and the pulling jig is pinched by a pinching jig different from the pulling jig and the opposing surface is An intermediate workpiece clamping step that presses in a direction to approach each other;
A stretch molding method comprising:
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