JP2009262207A - Hydroforming method of laminated metal sheet - Google Patents

Hydroforming method of laminated metal sheet Download PDF

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JP2009262207A
JP2009262207A JP2008115985A JP2008115985A JP2009262207A JP 2009262207 A JP2009262207 A JP 2009262207A JP 2008115985 A JP2008115985 A JP 2008115985A JP 2008115985 A JP2008115985 A JP 2008115985A JP 2009262207 A JP2009262207 A JP 2009262207A
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edge
forming
edges
preform
metal plates
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Takashi Haraoka
孝 原岡
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet hydroforming method of a laminated metal sheet which is advantageous cost-wise by means of a laminated metal sheet on the edges of both sides of which a locking projecting part is formed. <P>SOLUTION: The hydroforming method of the laminated metal sheet includes a step where a preformed body is formed by laminating metal sheets truing up edge parts of metal sheets and joining the edge parts, and a step where a hydraulically formed article is formed by imparting hydraulic pressure to the inside of the preformed body. The step where the preformed body is formed includes: a step where the trued edge parts are welded; a step where the edge parts are pressed with a pressing tool which is freely movable back and forth to the edge part while the edge parts are softened just after performing welding; and a step where the edge parts are formed into locking projected parts like a flange by pressing with the pressing tool. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、重ね合わせ板材のハイドロフォーム成形方法に関する。   The present invention relates to a method for hydroforming a laminated plate material.

従来、重ね合わせた二枚の板を金型で挟み込んでその外周部を型締めし、その二枚の板材間に液圧を注入して板材を膨出変形させ金型の凹部形状に合致した成形品に成形するハイドロフォーム成形法が知られている。   Conventionally, the two overlapped plates are sandwiched between molds, the outer periphery is clamped, and hydraulic pressure is injected between the two plates to bulge and deform the plate to match the concave shape of the mold. A hydrofoam molding method for molding a molded product is known.

従来、ハイドロフォーム形成法を適用するに当たり、重ね合わせた二枚の板が金型の凹部に引き込まれて、液圧の注入による板材の膨出変形で板材同士が縁部で引き剥がされることを阻止するために、下記特許文献１で示されるように、重ね合わせ板材を金型に設置する前に、予め、二枚の板の縁部に溶接により接合した突出部を形成している。二枚の板に形成される突出部は、溶接により片方の板材より突出した溶接による肉盛ビードの盛り上がりを利用したり、溶接により片方の板材の端部を撓ませた盛り上がりを利用したりしている。形成された突出部は、型の凹部入口に引っ掛けられ止まり、二枚の板の型の凹部への進入を阻止している。
特開２００２−９６１１６号公報 Conventionally, when applying the hydroform formation method, the two overlapped plates are drawn into the recesses of the mold, and the plate materials are peeled off at the edges due to the bulging deformation of the plate materials due to the injection of hydraulic pressure. In order to prevent this, as shown in Patent Document 1 below, before the overlapped plate material is placed in the mold, a protruding portion joined in advance to the edge of the two plates by welding is formed. The protrusions formed on the two plates use the build-up of the build-up bead due to welding that protrudes from one plate by welding, or use the rise that deflects the end of one plate by welding. ing. The formed protrusion is caught by the recess of the mold and stopped to prevent entry of the two plates into the recess of the mold.
JP 2002-96116 A

しかしながら、溶接によって二枚の板に突出部を設ける方法では、その突出する形状が上板だけであったり、上下の板に突出する形状を設けても、その突出する形状、高さや位置が不安定なため、上下の位置にズレが生じたりする。そのズレのため、金型に引っ掛かるのが上下どちらか一方となり、これにより引っ掛かった部分を中心としてフランジ部を回転する力が発生し、フランジ部に局部的な板厚減少や割れなどの品質不具合が生じる恐れがある。   However, in the method of providing the protrusions on the two plates by welding, even if the protruding shape is only the upper plate or the protruding shape is provided on the upper and lower plates, the protruding shape, height, and position are not good. Since it is stable, the vertical position may shift. Due to the deviation, the mold is caught on either the upper or lower side, which generates a force that rotates the flange around the hooked part, resulting in quality defects such as local thickness reduction or cracking in the flange. May occur.

その他にも、その突出する形状や膨出部形状の位置が不安定だったり、高さが不足したり、形状が一定でないために、二枚の板の溶接部が凹部内に入り込むことを阻止できずに、溶接部において二枚の板が引き剥がされる不具合が発生する恐れがある。たとえ、阻止できてもその位置がばらつくために二枚の板の溶接部を含むフランジの長さが長くなってしまい、二枚の板の材料が余計に必要でコストアップになったり、成形形状部の部品設計上の自由度が減少したりする。   In addition, the position of the protruding shape and bulging part shape is unstable, the height is insufficient, and the shape is not constant, preventing the welded part of the two plates from entering the recess. Otherwise, there may be a problem that the two plates are peeled off at the weld. Even if it can be prevented, the position of the flanges including the welded parts of the two plates becomes longer due to the variation in the position, which requires additional material for the two plates and increases the cost. The degree of freedom in designing parts is reduced.

その他にも、所定の突出形状を形成するために溶加材を多く使用し、二枚の板の下板を上板より大きく（長く）する必要があり、コストアップとなってしまう。また、上下二枚の板のサイズが異なるため、上下二枚の板の打ち抜き金型がそれぞれ別々に必要でコストアップになっている。打ち抜き加工で形成された鋭利な形状がそのまま存在しているため、自動車のガソリンタンク周辺の部品を製造した場合、衝突などがあった場合にガソリンタンクとハイドロ部品の鋭利なフランジ部が接触し、ガソリンタンクを突き破る危険性がある。このため鋭利な形状を隠すために、フランジ端部に別部品を溶接接合し、鋭利な部分を溶接で溶かすなどして、ガソリンタンクとの接触があってもガソリンタンクを突き破ることのないような施策を図っていたためにコストアップとなっている。   In addition, it is necessary to use a large amount of filler material in order to form a predetermined protruding shape, and it is necessary to make the lower plate of the two plates larger (longer) than the upper plate, resulting in an increase in cost. Further, since the sizes of the upper and lower two plates are different, punching dies for the upper and lower two plates are separately required and the cost is increased. Since the sharp shape formed by punching exists as it is, when manufacturing parts around the gasoline tank of an automobile, when there is a collision etc., the sharp flange part of the gasoline tank and hydro parts contact, There is a risk of breaking through the gasoline tank. For this reason, in order to hide the sharp shape, another part is welded and joined to the flange end, and the sharp part is melted by welding, so that it does not break through the gasoline tank even if there is contact with the gasoline tank. Costs increased due to the measures taken.

上記目的を達成するための本発明は、金属板の縁部を揃えて重ね合わせ当該縁部を接合して予備成形体を成形する段階と、当該予備成形体の内部に液圧を付与して液圧成形品を成形する段階と、を含む重ね合わせ板材のハイドロフォーム成形方法において、前記予備成形体を成形する段階は、前記揃えた縁部を溶接する段階と、当該溶接した直後当該縁部が軟化している間に、前記縁部に対して進退自在な押圧工具で前記縁部を押圧する段階と、前記押圧工具の押圧により当該縁部をフランジ状の係止突起部を形成する段階と、を含むことを特徴とする重ね合わせ板材のハイドロフォーム成形方法である。   In order to achieve the above object, the present invention includes a step of aligning the edges of a metal plate and joining the edges to form a preform, and applying hydraulic pressure to the interior of the preform. Forming the preform, the step of forming the preform, the step of welding the aligned edges, and the edge immediately after the welding A step of pressing the edge with a pressing tool which is movable forward and backward with respect to the edge while the edge is softened, and a step of forming a flange-shaped locking projection by pressing the pressing tool. And a hydroform forming method for a laminated plate material.

本発明によれば、重ね合わせた金属板の縁部を溶接するため、同じ大きさの金属板を用いることができ、コスト的に有利である。   According to the present invention, since the edges of the stacked metal plates are welded, the same size metal plate can be used, which is advantageous in terms of cost.

重ね合わせた金属板の溶接した縁部が軟化している間に、押圧工具を溶接した縁部に押圧し、溶接した縁部を、金属板を重ね合わせる方向の両側にフランジ状に突出させた係止突起部を形成するため、工具を押圧するのみの小さな力で成形ができる。   While the welded edge of the overlapped metal plate was softened, the pressing tool was pressed against the welded edge, and the welded edge was projected in a flange shape on both sides in the direction of overlapping the metal plates Since the locking projection is formed, molding can be performed with a small force only by pressing the tool.

係止突起部は、押圧工具の位置を制御し、金属板の縁部に押圧工具を押圧することにより形成されるため、係止突起部を形成するための溶加材を減らすことができる。   Since the locking projection is formed by controlling the position of the pressing tool and pressing the pressing tool against the edge of the metal plate, the filler material for forming the locking projection can be reduced.

係止突起部は、工具の位置制御で形成されるため、安定した所定の高さの突起部を形成することができる。   Since the locking projection is formed by controlling the position of the tool, a projection having a stable predetermined height can be formed.

係止突起部により、金型の凹部に入ることを阻止する引っ掛かり部で金属板を引っ掛けることができ、成形品のフランジの長さを短くすることができ、コスト的に有利となる。   With the locking protrusion, the metal plate can be hooked at the hook portion that prevents entry into the recess of the mold, and the length of the flange of the molded product can be shortened, which is advantageous in terms of cost.

重ね合わせた金属板の両側からフランジ状の係止突起部が突出しているため、金型の係止部の両側で同時に金属板を引っ掛けることができ、係止部に両側から同じ力を加えることとなり、重ね合わせた金属板の局部の板厚の減少や割れなどの品質不都合は発生しなくなる。   Because the flange-shaped locking projections protrude from both sides of the stacked metal plates, the metal plates can be hooked simultaneously on both sides of the mold locking portion, and the same force is applied to the locking portions from both sides. Therefore, inconveniences such as a reduction in thickness and cracking of the local portions of the stacked metal plates do not occur.

以下、添付した図面を参照して本発明を適用した最良の実施形態を説明する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments to which the invention is applied will be described with reference to the accompanying drawings.

［第１実施形態］
（予備成形体の成形）
図１および図２は、第１実施形態に係る予備成形体の成形過程を示す概略図である。 [First Embodiment]
(Forming preforms)
1 and 2 are schematic views showing a molding process of the preform according to the first embodiment.

本実施形態において予備成形体の成形は次のような手順で行なわれる。   In this embodiment, the preform is formed by the following procedure.

図１に示すように、二枚の金属板１、２を縁部が揃うように重ね合わせる。その金属板１、２の縁部を一対の挟持工具３ａ、４ａで重ね合わせた方向に圧力６、７を加えながら挟持する。そして、圧力６、７を加えた状態で金属板１、２の縁部を溶接５する。予備成形手段は、縁部溶接手段、押圧手段、係止突起形成部手段で構成される。たとえば、縁部溶接手段は溶融溶接装置であり、押圧手段は押圧工具としてのローラーであり、係止突起形成部手段は挟持工具としてのクランプ部材である。   As shown in FIG. 1, the two metal plates 1 and 2 are overlapped so that the edges are aligned. The metal plates 1 and 2 are clamped while applying pressures 6 and 7 in a direction in which the edge portions of the metal plates 1 and 2 are overlapped with a pair of clamping tools 3a and 4a. Then, the edges of the metal plates 1 and 2 are welded 5 with the pressures 6 and 7 applied. The preforming means includes an edge welding means, a pressing means, and a locking projection forming means. For example, the edge welding means is a fusion welding apparatus, the pressing means is a roller as a pressing tool, and the locking projection forming means is a clamp member as a clamping tool.

次に、図２に示すように、溶接された縁部を一定の形状に成形するために、縁部に沿ってコの字型に窪んだ形状を有する押圧工具８ａを縁部に当接させ、縁部に向けて圧力９を加えて押圧する。そして、縁部を押圧工具８ａのコの字型の形状に成形する。なお、押圧工具８ａにおける金属板１、２厚み方向のコの字型の開口寸法は、溶接された金属板１、２の縁部の寸法よりも大きい。したがって、押圧工具８ａを金属板１、２の縁部に押圧させることによって、縁部にフランジ状（例えばＴ字状）に突出させた係止突起部１０ａを形成することができる。   Next, as shown in FIG. 2, in order to form the welded edge into a certain shape, a pressing tool 8a having a U-shaped recess along the edge is brought into contact with the edge. Apply pressure 9 toward the edge and press. And an edge part is shape | molded in the U-shaped shape of the pressing tool 8a. In addition, the U-shaped opening dimension of the metal plates 1 and 2 in the thickness direction of the pressing tool 8 a is larger than the dimension of the edge of the welded metal plates 1 and 2. Therefore, by pressing the pressing tool 8a against the edge of the metal plates 1 and 2, the locking protrusion 10a that protrudes in a flange shape (for example, T-shape) can be formed at the edge.

重ね合わせた二枚の金属板１、２は、一つの打ち抜き金型で、液注入穴の有る下板金属板２と液注入穴の無い上板金属板１を打ち抜き、これらの上板金属板１と下板金属板２の縁部を揃えて重ね合わせる。例示において、下板金属板２が液注入穴を有し、上板金属板１が液注入穴を有していないが、液注入穴は二枚の金属板１、２のどちらに設けても良い。同じ大きさの金属板を用いることができるので、コスト的に有利である。   The two superposed metal plates 1 and 2 are a single punching die, and a lower plate metal plate 2 having a liquid injection hole and an upper plate metal plate 1 having no liquid injection hole are punched. 1 and the edge of the lower metal plate 2 are aligned and overlapped. In the example, the lower metal plate 2 has a liquid injection hole and the upper metal plate 1 does not have a liquid injection hole. However, the liquid injection hole may be provided on either of the two metal plates 1 and 2. good. Since metal plates of the same size can be used, this is advantageous in terms of cost.

一対の挟持工具３ａ、４ａにより、重ね合わせた二枚の金属板１、２は、上下方向より挟持され、加圧６、７される。金属板１、２の縁部が、挟持工具３ａ、４ａから突出するようにセットする。挟持工具３ａ、４ａから突出される金属板１、２の縁部の長さは、係止突起部１０ａを形成する分の長さであることが望ましい。   The two metal plates 1 and 2 overlapped by the pair of clamping tools 3a and 4a are clamped in the vertical direction and pressurized 6 and 7. Set so that the edges of the metal plates 1 and 2 protrude from the clamping tools 3a and 4a. As for the length of the edge of the metal plates 1 and 2 protruding from the clamping tools 3a and 4a, it is desirable that the length is as long as the locking projection 10a is formed.

重ね合わせた二枚の金属板１、２の縁部には溶接５が行われる。溶接５は、例えば拝み溶接であり、金属板１、２の縁部が溶接された後の所定の時間、軟化状態が続いていることが望ましい。   Welding 5 is performed on the edges of the two metal plates 1 and 2 that are overlapped. The weld 5 is, for example, a prayer weld, and it is desirable that the softened state continues for a predetermined time after the edges of the metal plates 1 and 2 are welded.

溶接５が行われた直後、重ね合わせた二枚の金属板１、２の縁部が軟化している間に、押圧工具８ａを金属板１、２の縁部に当接し、連続的な加圧成形９を行う。押圧工具８ａは、例えばローラーであり、挟持工具３ａ、４ａと共に係止突起部１０ａを成形する金型の機能も有する。ローラーとして、金属板１、２の縁部と当接する当接面が凹んでいる凹部を有し、断面形状がＨ状をしたローラーが望ましい。さらに、ローラーの回転中心軸が金属板１、２を重ね合わせる方向と平行であることが望ましい。ローラーの凹部の凹んでいる部分の幅は、重ね合わせた二枚の金属板１、２の厚さよりも大きい。溶接した縁部はローラーの凹部の中心に押圧される。   Immediately after the welding 5 is performed, the pressing tool 8a is brought into contact with the edges of the metal plates 1 and 2 while the edges of the two superimposed metal plates 1 and 2 are softened. Press forming 9 is performed. The pressing tool 8a is, for example, a roller, and also has a mold function for forming the locking projection 10a together with the clamping tools 3a and 4a. As the roller, a roller having a recessed portion with a recessed contact surface that contacts the edges of the metal plates 1 and 2 and having an H-shaped cross section is desirable. Furthermore, it is desirable that the rotation center axis of the roller is parallel to the direction in which the metal plates 1 and 2 are overlapped. The width of the concave portion of the concave portion of the roller is larger than the thickness of the two metal plates 1 and 2 that are superimposed. The welded edge is pressed against the center of the roller recess.

重ね合わせた二枚の金属板１、２の縁部は、押圧工具８ａが挟持工具３ａ、４ａ付近まで加圧成形９されることで、金属板１、２を重ね合わせる方向の両側にＴ字状に突出させられた係止突起部１０ａに変形される。係止突起部１０ａは、重ね合わせた二枚の金属板１、２の二枚板面に対し直角な受け面１１、１２を有する。   The edges of the two metal plates 1 and 2 that are overlapped are T-shaped on both sides in the direction in which the metal plates 1 and 2 are overlapped when the pressing tool 8a is press-molded 9 to the vicinity of the sandwiching tools 3a and 4a. It deform | transforms into the latching protrusion part 10a protruded in the shape. The locking projection 10 a has receiving surfaces 11 and 12 that are perpendicular to the two plate surfaces of the two metal plates 1 and 2 that are overlapped.

重ね合わせた金属板１、２の溶接した縁部が軟化している間に、溶接した縁部を係止突起部１０ａに形成するため、押圧工具８ａは溶接した縁部に押圧するのみの小さな力で成形ができる。係止突起部１０ａは、押圧工具８ａの位置を制御し、金属板１、２の縁部に押圧工具８ａを押圧することにより形成されるため、係止突起部１０ａを形成するための溶加材を減らすことができる。係止突起部１０ａは、挟持工具３ａ、４ａおよび押圧工具８ａの位置制御で形成されるため、安定した所定の高さの突起部にすることができる。   While the welded edges of the overlapped metal plates 1 and 2 are softened, the pressing tool 8a is small enough to press the welded edge to form the welded edge on the locking projection 10a. Can be molded with force. Since the locking projection 10a is formed by controlling the position of the pressing tool 8a and pressing the pressing tool 8a against the edge of the metal plates 1 and 2, the melt for forming the locking projection 10a Material can be reduced. Since the locking projection 10a is formed by controlling the positions of the clamping tools 3a, 4a and the pressing tool 8a, the locking projection 10a can be a projection having a stable predetermined height.

（液圧成形品の成形）
図３および図４は、第１実施形態に係る液圧成形品の成形過程を示す概略図である。 (Molding of hydraulic molded products)
3 and 4 are schematic views showing a molding process of the hydraulic molded product according to the first embodiment.

本実施形態の液圧成形品の成形は、図３および図４に示すように、予備成形体を液圧成形品の形状に合致した形状を有する金型２１、２２にセットし、予備成形体内部に液圧を付与して膨出変形させることによって行われる。   As shown in FIGS. 3 and 4, the hydroformed product of the present embodiment is formed by setting a preformed body on molds 21 and 22 having a shape that matches the shape of the hydroformed product. This is done by applying a hydraulic pressure to the inside to cause bulge deformation.

一対の金型２１、２２は液圧成形手段として機能する。   The pair of molds 21 and 22 functions as a hydraulic molding means.

本実施形態の液圧成形品の成形は、図３に示すように、係止突起部１０ａを有する重ね合わせた二枚の金属板１、２を上下から凹部を有する金型２１、２２で挟み込み、下板金属板２に設けられた液注入穴から液体を加圧注入し、金型２１、２２内の空間２３、２４に金属板１、２を膨出させる。係止突起部１０ａが金型２１、２２に設けられた係止部２５、２６よりも外側に十分な距離を保ちセットされる。   As shown in FIG. 3, the hydroformed product of this embodiment is formed by sandwiching two metal plates 1 and 2 having a locking projection 10a between upper and lower molds 21 and 22 having recesses. Then, a liquid is pressurized and injected from a liquid injection hole provided in the lower metal plate 2, and the metal plates 1 and 2 are expanded in the spaces 23 and 24 in the molds 21 and 22. The locking projection 10a is set with a sufficient distance outside the locking portions 25, 26 provided on the molds 21, 22.

本実施形態の液圧成形品の成形において、図４に示すように、重ね合わせた二枚の金属板１、２は、その内部に液圧を付与され膨出変形することによって、液圧成形品の形状３０、３１に合致した形状となる。膨出変形する際、二枚の板面に対し直角な受け面１１、１２を有する係止突起部１０ａは金型２１、２２の外側に設けられた係止部２５、２６のストッパー形状２７、２８に引っかかることにより、金型２１、２２内への進入を阻止される。液圧成形品は安定したフランジ長さ２９を得ることができ、コスト的に有利となる。   In the formation of the hydraulic molded product of the present embodiment, as shown in FIG. 4, the two metal plates 1 and 2 that are overlapped are hydraulically molded by applying hydraulic pressure to the inside thereof and bulging and deforming. The shape matches the shape 30, 31 of the product. When bulging and deforming, the locking projection 10a having the receiving surfaces 11 and 12 perpendicular to the two plate surfaces is a stopper shape 27 of locking portions 25 and 26 provided outside the molds 21 and 22, By being caught by 28, entry into the molds 21 and 22 is prevented. The hydroformed product can obtain a stable flange length 29, which is advantageous in terms of cost.

また、Ｔ字状の係止突起部１０ａを有する重ね合わせた金属板１、２は、その縁部の両側から突出しているため、金型２１、２２の係止部２５、２６の両側で同時に金属板１、２を引っ掛けることができ、係止部２５、２６に両側から同じ力を加えることとなり、重ね合わせた金属板１、２の局部の板厚の減少や割れなどの品質不都合は発生しなくなる。   In addition, since the stacked metal plates 1 and 2 having the T-shaped locking projections 10a protrude from both sides of the edge portion, both the locking portions 25 and 26 of the molds 21 and 22 can be simultaneously performed on both sides. The metal plates 1 and 2 can be hooked, and the same force is applied to the locking portions 25 and 26 from both sides, resulting in quality inconveniences such as a reduction in thickness and cracking of the local portions of the stacked metal plates 1 and 2. No longer.

また、液圧成形品のＴ字状のフランジ端部に鋭利な形状がなくなるので、自動車のガソリンタンク周辺部品に使用しても、ガソリンタンクの干渉対策として別工程で鋭利な部分を溶接で溶かしたり、新たな別部品を溶接接合したりする必要が無く、コスト的に有利となる。   Also, since the sharp-shaped end of the T-shaped flange of the hydroformed product is lost, even if it is used for automobile gasoline tank peripheral parts, the sharp part is melted by welding as a countermeasure against gasoline tank interference in a separate process. There is no need to weld or join another new part, which is advantageous in terms of cost.

［第２実施形態］
（予備成形体の成形）
図５は、第２実施形態に係る予備成形体の成形を示す概略図である。なお、図１などに示す部材と共通する部材の説明は省略する。また、本実施形態に係る液圧成形品の成形は、予備成形体を成形した後に、第１実施形態と同様に行われるため説明は省略する。 [Second Embodiment]
(Forming preforms)
FIG. 5 is a schematic view showing the molding of the preform according to the second embodiment. The description of members common to those shown in FIG. Moreover, since the shaping | molding of the hydraulic-pressure molded product which concerns on this embodiment is performed similarly to 1st Embodiment after shape | molding a preforming, description is abbreviate | omitted.

図５に示すように、本実施形態の重ね合わせた二枚の金属板１、２に形成される係止突起部１０ｂは、前述の第１実施形態の係止突起部１０ａと同様に、金属板１、２の縁部に溶接が行われ、金属板１、２の縁部が軟化している間に、押圧工具８ｂを金属板の縁部に当接し、連続的な加工成形が行われ成形される。   As shown in FIG. 5, the locking projection 10b formed on the two metal plates 1 and 2 overlapped in this embodiment is similar to the locking projection 10a of the first embodiment described above. While the edges of the plates 1 and 2 are welded and the edges of the metal plates 1 and 2 are softened, the pressing tool 8b is brought into contact with the edges of the metal plate and continuous machining is performed. Molded.

押圧工具８ｂは、例えば第１実施形態と同様なローラーであり、一対の挟持工具３ｂ、４ｂと共に係止突起部１０ｂを成形する金型の機能も有する。挟持工具３ｂ、４ｂは、金属板１、２を挟持する面の係止突起部１０ｂを形成する側の縁が面取りされた端部を有し、第１実施形態とは異なり二枚の板面に対し直角な受け面を設けない係止突起部１０ｂを形成する。係止突起部１０ｂに二枚の板面に対し直角な受け面を設けないことによって、係止突起部１０ｂの形状の品質に合わせて、挟持工具３ｂ、４ｂや押圧工具８ｂの寿命や自由度を持たせることができる。   The pressing tool 8b is, for example, a roller similar to that in the first embodiment, and also has a mold function for forming the locking projection 10b together with the pair of clamping tools 3b and 4b. The clamping tools 3b and 4b have end portions with chamfered edges on the side that forms the locking projections 10b of the surfaces that sandwich the metal plates 1 and 2, unlike the first embodiment. A locking projection 10b is formed that does not have a receiving surface that is perpendicular thereto. By not providing the catching protrusion 10b with a receiving surface perpendicular to the two plate surfaces, the life and flexibility of the clamping tools 3b, 4b and the pressing tool 8b are matched to the quality of the shape of the catching protrusion 10b. Can be given.

［第３実施形態］
（予備成形体の成形）
図６は、第３実施形態に係る予備成形体の成形を示す概略図である。なお、図１などに示す部材と共通する部材の説明は省略する。また、本実施形態に係る液圧成形品の成形は、予備成形体を成形した後に、第１実施形態と同様に行われるため説明は省略する。 [Third Embodiment]
(Forming preforms)
FIG. 6 is a schematic view showing the molding of the preform according to the third embodiment. The description of members common to those shown in FIG. Moreover, since the shaping | molding of the hydraulic-pressure molded product which concerns on this embodiment is performed similarly to 1st Embodiment after shape | molding a preforming, description is abbreviate | omitted.

図６に示すように、本実施形態の重ね合わせた二枚の金属板１、２に形成される係止突起部１０ｃは、前述の第１実施形態の係止突起部１０ａと同様に、金属板１、２の縁部に溶接が行われ、金属板１、２の縁部が軟化している間に、押圧工具８ｃを金属板１、２の縁部に当接し、連続的な加工成形が行われ成形される。   As shown in FIG. 6, the locking projection 10c formed on the two metal plates 1 and 2 overlapped in this embodiment is similar to the locking projection 10a of the first embodiment described above. While the edges of the plates 1 and 2 are welded and the edges of the metal plates 1 and 2 are softened, the pressing tool 8c is brought into contact with the edges of the metal plates 1 and 2 and is continuously processed and formed. Is performed and molded.

押圧工具８ｃは、円柱状のローラーであり、一対の挟持工具３ｃ、４ｃと共にＴ字状の係止突起部１０ｃを成形する金型の機能も有する。一対の挟持工具３ｃ、４ｃは、金属板に接する面の前記係止突起部を形成する側の縁が階段状に凹んだ端部を有する。係止突起部１０ｃを挟持工具３ｃ、４ｃの間で形成することによって、確実に二枚板面に対し直角な受け面１１、１２を形成することができる。   The pressing tool 8c is a cylindrical roller, and also has a mold function for forming the T-shaped locking projection 10c together with the pair of clamping tools 3c and 4c. The pair of clamping tools 3c and 4c have end portions where the edges on the side where the locking projections are formed on the surface in contact with the metal plate are recessed stepwise. By forming the locking projection 10c between the clamping tools 3c and 4c, the receiving surfaces 11 and 12 perpendicular to the two-plate surface can be formed reliably.

第１実施形態に係る予備成形体の成形状態を示す概略図である。It is the schematic which shows the shaping | molding state of the preforming body which concerns on 1st Embodiment. 第１実施形態に係る予備成形体の成形状態を示す概略図である。It is the schematic which shows the shaping | molding state of the preforming body which concerns on 1st Embodiment. 第１実施形態に係る液圧成形品の成形状態を示す概略図である。It is the schematic which shows the shaping | molding state of the hydraulic-pressure molded article which concerns on 1st Embodiment. 第１実施形態に係る液圧成形品の成形状態を示す概略図である。It is the schematic which shows the shaping | molding state of the hydraulic-pressure molded article which concerns on 1st Embodiment. 第２実施形態に係る予備成形体の成形状態を示す概略図である。It is the schematic which shows the shaping | molding state of the preforming body which concerns on 2nd Embodiment. 第３実施形態に係る予備成形体の成形状態を示す概略図である。It is the schematic which shows the shaping | molding state of the preforming body which concerns on 3rd Embodiment.

符号の説明Explanation of symbols

１、２ 金属板、
３ａ、４ａ、３ｂ、４ｂ、３ｃ、４ｃ 挟持工具、
８ａ、８ｂ、８ｃ 押圧工具、
１０ａ、１０ｂ、１０ｃ 係止突起部、
２１、２２ 金型、
２５、２６ 係止部。 1, 2, metal plate,
3a, 4a, 3b, 4b, 3c, 4c
8a, 8b, 8c pressing tool,
10a, 10b, 10c locking projection,
21, 22 Mold,
25, 26 Locking part.

Claims (7)

金属板の縁部を揃えて重ね合わせ当該縁部を接合して予備成形体を成形する段階と、当該予備成形体の内部に液圧を付与して液圧成形品を成形する段階と、を含む重ね合わせ板材のハイドロフォーム成形方法において、
前記予備成形体を成形する段階は、
前記揃えた縁部を溶接する段階と、
当該溶接した直後当該縁部が軟化している間に、前記縁部に対して進退自在な押圧工具で前記縁部を押圧する段階と、
前記押圧工具の押圧により当該縁部をフランジ状の係止突起部を形成する段階と、
を含むことを特徴とする重ね合わせ板材のハイドロフォーム成形方法。 Aligning and joining the edges of the metal plate and joining the edges to form a preform, and forming a hydroformed product by applying hydraulic pressure to the interior of the preform. In the hydroforming method of the laminated plate material including,
The step of forming the preform includes
Welding the aligned edges;
Immediately after the welding, while the edge is softened, the step of pressing the edge with a pressing tool that is movable forward and backward with respect to the edge;
Forming a flange-like locking projection on the edge by pressing the pressing tool;
A hydroform molding method for a laminated plate material, comprising: 前記液圧成形品を成形する段階は、
前記液圧成形品の形状に合致した形状の凹部と、前記係止突起部が前記凹部内に入り込むのを阻止する係止部と、を有する金型に、前記予備成型体を設置する段階と、
前記係止突起部を前記金型の前記係止部に係止させて前記予備成形体の内部に液圧を付与して膨出変形させる段階と、
を含むことを特徴とする請求項１に記載の重ね合わせ板材のハイドロフォーム成形方法。 The step of molding the hydroformed product comprises:
Installing the preform in a mold having a recess having a shape that matches the shape of the hydroformed product and a locking portion that prevents the locking projection from entering the recess; ,
Locking the locking protrusion to the locking portion of the mold and applying a hydraulic pressure to the preform to bulge and deform,
The method for hydroforming a laminated plate material according to claim 1, comprising: 前記押圧工具は、ローラーであり、
前記ローラーの形状は、当接面の中央部に凹部を有し、
前記凹部の凹んでいる部分の幅は、前記金属板を重ね合わせる方向の前記予備成形体の厚さよりも大きく、
前記溶接した縁部は前記ローラーの前記凹部の幅方向の中心部分に押圧されることを特徴とする請求項１に記載の重ね合わせ板材のハイドロフォーム成形方法。 The pressing tool is a roller;
The shape of the roller has a recess in the center of the contact surface,
The width of the recessed portion of the recess is greater than the thickness of the preform in the direction of overlapping the metal plates,
The method for hydroforming a laminated plate material according to claim 1, wherein the welded edge is pressed against a central portion in the width direction of the concave portion of the roller. 前記予備成形体を成形する段階は、
前記金属板を重ね合わせる方向の両側から、一対の挟持工具により当該金属板を挟持する段階を含み、
前記一対の挟持工具は、前記係止突起部を形成する分の長さを突出させて挟持することを特徴とする請求項１に記載の重ね合わせ板材のハイドロフォーム成形方法。 The step of forming the preform includes
From the both sides in the direction of overlapping the metal plates, including the step of sandwiching the metal plates by a pair of clamping tools,
The method for hydroforming a laminated plate material according to claim 1, wherein the pair of sandwiching tools are sandwiched by projecting a length corresponding to the formation of the locking projection. 前記一対の挟持工具は、前記凹部の縁が面取りされた端部を有することを特徴とする請求項４に記載の重ね合わせ板材のハイドロフォーム成形方法。   The method for hydroforming a laminated plate material according to claim 4, wherein the pair of clamping tools have end portions whose edges of the concave portions are chamfered. 前記予備成形体を成形する段階は、
前記金属板を重ね合わせる方向の両側から、一対の挟持工具により当該金属板を挟持する段階を含み、
前記一対の挟持工具は、前記凹部の縁が階段状に凹んだ端部を有することを特徴とする請求項１に記載の重ね合わせ板材のハイドロフォーム成形方法。 The step of forming the preform includes
From the both sides in the direction of overlapping the metal plates, including the step of sandwiching the metal plates by a pair of clamping tools,
The method for hydroforming a laminated plate material according to claim 1, wherein the pair of clamping tools have end portions in which the edges of the recesses are recessed stepwise. 金属板の縁部を揃えて重ね合わせ当該縁部を接合して予備成形体を成形する予備成形手段と、当該予備成形体の内部に液圧を付与して液圧成形品を成形する液圧成形手段と、を含む重ね合わせ板材のハイドロフォーム成形装置において、
前記予備成形手段は、
前記揃えた縁部を溶接する縁部溶接手段と、
当該溶接した直後当該縁部が軟化している間に、前記縁部を押圧し当該縁部に対して進退自在な押圧手段と、
前記押圧手段の押圧により当該縁部をフランジ状の係止突起部を成形する係止突起部成形手段と、
を含むことを特徴とする重ね合わせ板材のハイドロフォーム成形装置。 Preliminary molding means for forming the preform by aligning the edges of the metal plates and joining the edges, and the hydraulic pressure for forming the hydroformed product by applying hydraulic pressure to the interior of the preform In a hydroforming apparatus for a laminated plate material including a forming means,
The preforming means includes
Edge welding means for welding the aligned edges;
Immediately after the welding, while the edge is softened, pressing means that presses the edge and is movable forward and backward with respect to the edge;
A locking projection forming means for forming a flange-shaped locking projection on the edge by pressing of the pressing means;
An apparatus for hydroforming a laminated plate material, comprising:
JP2008115985A 2008-04-25 2008-04-25 Hydroforming method of laminated metal sheet Pending JP2009262207A (en)

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