JP4701814B2 - Liquid pressure molding die and method for producing partially reinforced molded product - Google Patents

Liquid pressure molding die and method for producing partially reinforced molded product Download PDF

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JP4701814B2
JP4701814B2 JP2005127766A JP2005127766A JP4701814B2 JP 4701814 B2 JP4701814 B2 JP 4701814B2 JP 2005127766 A JP2005127766 A JP 2005127766A JP 2005127766 A JP2005127766 A JP 2005127766A JP 4701814 B2 JP4701814 B2 JP 4701814B2
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molded product
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reinforcing member
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隼 北川
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Toyota Motor Corp
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Description

本発明は、液圧成形加工(ハイドロフォーム加工)により成形された、部分的に強化部を備えた成形製品の製造方法、及び、これに供する液圧成形用金型に関する。   The present invention relates to a method for producing a molded product partially provided with a reinforced part, which is molded by a hydraulic molding process (hydroform process), and a hydraulic molding die for use in this method.

従来、金属素管(又は素板)、を上下一対の成形用金型内にセットし、この素管内に液体を導入し、液体に圧力を負荷するとともに、必要に応じて管端から軸方向に圧縮力を加えることにより、素管を膨出させて、金型内の成形形状に倣った管状製品を得る液圧成形加工(液圧バルジ加工)方法が知られている。   Conventionally, a metal element tube (or element plate) is set in a pair of upper and lower molds, a liquid is introduced into the element tube, pressure is applied to the liquid, and axially from the tube end as necessary. There is known a hydraulic forming process (hydraulic bulging process) in which a blank is expanded by applying a compressive force to obtain a tubular product following the molded shape in a mold.

上記液圧成形加工にて成形された成形品には、部分的に高強度であることが要求される場合がある。この場合、肉厚の素管や高強度の素管を用いて強度を高めることができるが、製品の重量が増加したり、材料コストが嵩んだりするなどの問題が生じるため、成形品の強化が必要となる部分に強度の大きい別部材(補強部材)を溶接等により接合して強度を高める方法が採用されている。以下、成形品を補強部材にて補強したものを、『部分強化成形製品』と記載する。   A molded product formed by the above-described hydraulic forming process may be required to have high strength partially. In this case, the strength can be increased by using a thick tube or a high-strength tube, but problems such as an increase in the weight of the product and an increase in material cost occur. A method is adopted in which another member (reinforcing member) having a high strength is joined to a portion requiring reinforcement by welding or the like to increase the strength. Hereinafter, a product obtained by reinforcing a molded product with a reinforcing member is referred to as a “partially reinforced molded product”.

しかし、液圧成形加工により成形された成形品の一部に、補強部材が溶接等により接合されて成る部分強化成形製品では、図5(a)に示すように、補強部材12が成形品11より膨出してしまう。従って、部分強化成形製品が取り付けられる周辺部材の形状等の制限を受けて、部分強化成形製品10を所定の外径形状(H)とする必要がある場合には、図5(b)に示すように、成形品11の管径を小さくすることによって対応することとなり、部分強化成形製品10のうち成形品11に補強部材12を溶接しない部分において所定の外径形状(H)との間に間隙が生じてしまうという不具合があった。また、図5(a)に示すように、部分強化成形製品10において成形品11に補強部材12を溶接した部分と他の部分との間に管径の差が生じ、管形状が変形してしまうという不具合があった。   However, in a partially reinforced molded product in which a reinforcing member is joined by welding or the like to a part of a molded product formed by hydraulic forming, the reinforcing member 12 is formed as a molded product 11 as shown in FIG. It will bulge more. Accordingly, in the case where it is necessary to make the partially reinforced molded product 10 a predetermined outer diameter shape (H) under the restriction of the shape or the like of the peripheral member to which the partially reinforced molded product is attached, it is shown in FIG. As described above, this is achieved by reducing the tube diameter of the molded product 11, and between the predetermined outer diameter shape (H) in the portion of the partially reinforced molded product 10 where the reinforcing member 12 is not welded to the molded product 11. There was a problem that a gap was generated. Moreover, as shown to Fig.5 (a), the difference in a pipe diameter arises between the part which welded the reinforcement member 12 to the molded article 11, and the other part in the partial reinforcement | strengthening molded product 10, and a pipe shape deform | transforms. There was a bug that it would end up.

そこで、特許文献1では、金属素管(中空部材)の外側に補強素材を配置し、金属素管と補強素材との間に接着剤を介在させた状態で、成形用金型に挿入したのち、金属素管の中空部に高圧液体を注入して膨出させて、金型内の成形形状に倣った管状製品を得るバルジ成形技術が提案されている。この技術によれば、同一工程にて金属素管と補強素材とを成形して、一体的となった補強部材と成形品とから成る部分強化成形製品を得ることができ、また、部分強化成形製品は金型の成形形状に倣ったものとなる。   Therefore, in Patent Document 1, after a reinforcing material is disposed outside the metal pipe (hollow member) and an adhesive is interposed between the metal pipe and the reinforcing material, it is inserted into a molding die. In addition, a bulge forming technique has been proposed in which a high-pressure liquid is injected into a hollow portion of a metal base tube to swell, thereby obtaining a tubular product that follows the molded shape in the mold. According to this technology, a metal base tube and a reinforcing material can be molded in the same process to obtain a partially reinforced molded product composed of an integrated reinforcing member and molded product. The product follows the mold shape.

また、特許文献2では、金属素管を、その外径よりも大きい内径を有する補強素材(補強用金属管)内に挿入した状態で、この金属素管に液圧成形加工を施し、金属素管及び補強素材を同時に拡管する技術が提案されている。この技術によれば、接着剤による接着や溶接をすることなく、部分的に補強された異形環状製品を得ることができ、補強部材と一体的になった分強化成形品は金型の成形形状に倣ったものとなる。
特開平11−5125号公報 特開2001−334316号公報
Further, in Patent Document 2, in a state where the metal element tube is inserted into a reinforcing material (reinforcing metal tube) having an inner diameter larger than the outer diameter, the metal element tube is subjected to a hydroforming process, A technique for expanding the pipe and the reinforcing material at the same time has been proposed. According to this technology, it is possible to obtain a deformed annular product that is partially reinforced without being bonded or welded with an adhesive. It is imitated.
Japanese Patent Laid-Open No. 11-5125 JP 2001-334316 A

上記特許文献1に記載の技術を用いた場合、液圧成形加工にて複雑な形状の成形品を成形する際には、予備プレスを行うことが一般的であるため、液圧成形加工を施す直前に、接着剤塗布を必要とする場合には、この接着剤を塗布することができないという課題が残る。また、金属素管と補強素材とは成形時に接着されるため、金属素管と補強部材とが位置ずれして予期せぬ位置に補強部材が接着される可能性がある。   When the technique described in Patent Document 1 is used, when a molded product having a complicated shape is formed by a hydraulic forming process, a pre-press is generally performed. Immediately before, when it is necessary to apply an adhesive, there remains a problem that the adhesive cannot be applied. Further, since the metal base tube and the reinforcing material are bonded at the time of molding, there is a possibility that the metal base tube and the reinforcing member are displaced and the reinforcing member is bonded at an unexpected position.

また、上記特許文献2の技術を用いた場合、成形時に金属素管及び補強素材が拡管する際に、補強用素管が金属素管に当接する部分において、補強用素管の角が金属素管に当たった状態で加圧されるため、金属素管が破断する虞がある。また、成形不良の発生を防止するために、金属素管と補強素材との厚みの関係が限定されてしまう。そして、管状の成形品を環状の補強部材で補強することはできるが、補強部材が管状でない場合には、適応させることができない。   In addition, when the technique of Patent Document 2 is used, when the metal base tube and the reinforcing material are expanded at the time of molding, the corners of the reinforcing base tube are at the portions where the reinforcing base tube abuts the metal base tube. Since the metal is pressed while being in contact with the pipe, the metal base pipe may be broken. Moreover, in order to prevent generation | occurrence | production of shaping | molding defect, the relationship of the thickness of a metal base tube and a reinforcement raw material will be limited. And although a tubular molded product can be reinforced with an annular reinforcing member, it cannot be adapted when the reinforcing member is not tubular.

ところで、部分強化成形製品が取り付けられる周辺部材には、部分強化成形製品のための空間が定められていることがあり、この所定の空間内に部分強化成形製品を収めることになるが、一旦取り付けた部分強化成形製品の強度が不足していることが判明し、更に強度の高い補強部材を備えた部分強化成形製品に取り替える必要が生じることがある。この対応として、部分強化成形製品の設計変更を行う場合、先述のように、補強部材の板厚を大きくして、成形品を小さく成形することとなるが、新たな金型が必要となり、コストが嵩むという不具合がある。また、対応として、周辺部材の設計変更をした場合、周辺部材の形状変更が必要になってコストが嵩んだり、周辺部材によっては変更が不可能であったりするというような、不具合がある。   By the way, the peripheral member to which the partially reinforced molded product is attached may have a space for the partially reinforced molded product, and the partially reinforced molded product is accommodated in the predetermined space. The strength of the partially reinforced molded product was found to be insufficient, and it may be necessary to replace the partially reinforced molded product with a higher strength reinforcing member. As a countermeasure for this, when changing the design of a partially reinforced molded product, as described above, the thickness of the reinforcing member is increased and the molded product is molded smaller, but a new mold is required and the cost is reduced. There is a problem that it becomes bulky. As a countermeasure, when the design of the peripheral member is changed, there is a problem that the shape of the peripheral member needs to be changed and the cost is increased, or the change is impossible depending on the peripheral member.

そこで、本発明では、上記背景技術と課題に鑑み、液圧成形加工の成形品を補強部材で補強した部分強化成形製品を製造するにあたって、部分強化成形製品の外形形状において補強部とそれ以外の部分との間の径の差や外形形状の変化を低減することができるとともに、補強部材の厚み変更に柔軟に対応することの可能な、部分強化成形製品の製造方法及びこれに用いる液圧成形用金型について提案する。   Therefore, in the present invention, in view of the above-described background art and problems, when manufacturing a partially reinforced molded product obtained by reinforcing a molded product of a hydraulic molding process with a reinforcing member, a reinforcing portion and other parts in the external shape of the partially reinforced molded product A method of manufacturing a partially reinforced molded product capable of reducing a difference in diameter and a change in an outer shape of the portion and flexibly responding to a change in the thickness of the reinforcing member, and hydraulic forming used for the method We propose a mold for use.

本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段を説明する。   The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

即ち、請求項1においては、成形品に部分的に設けられた補強部に、成形板材から成る補強部材を固設して構成される部分強化成形製品の、該成形品を成形するための液圧成形用金型であって、前記金型の内部に形成される成形面のうち、成形品の補強部を成形する補強部成形面を、金型に対して着脱可能な入子型で形成し、前記金型の成形面を、部分強化成形製品の外形形状より補強部材の全体形状を除いた形状とし、前記金型により、前記補強部は、前記補強部材の形状に合わせて該補強部材の全体形状ぶんだけ、部分強化成形製品の外形形状よりも凹んだ形状に成形され、前記成形品の補強部と該補強部以外の非補強部との間には、成形品に加わる応力により前記非補強部と補強部との間に応力が集中することを回避するための、成形品を緩やかに屈曲させた形状移行部が形成されるものである。 That is, in claim 1, a liquid for molding a molded product of a partially reinforced molded product constituted by fixing a reinforcing member made of a molded plate material to a reinforcing part partially provided in the molded product. It is a pressure molding die, and a reinforcing part molding surface for molding a reinforcing part of a molded product among molding surfaces formed inside the mold is formed by a telescopic mold that can be attached to and detached from the mold. The molding surface of the mold is formed by removing the overall shape of the reinforcing member from the outer shape of the partially reinforced molded product, and the reinforcing portion is reinforced by the mold according to the shape of the reinforcing member. Only the entire shape of the member is molded into a shape that is recessed from the outer shape of the partially reinforced molded product. Between the reinforced portion of the molded product and the non-reinforced portion other than the reinforced portion, stress is applied to the molded product. Molding to avoid stress concentration between the non-reinforcing part and the reinforcing part The is gently what shape transitional portion is bent is formed.

請求項2においては、成形品と、該成形品に部分的に設けられた補強部に固設された成形板材から成る補強部材とで構成される、部分強化成形製品の製造方法において、前記部分強化成形製品の外形形状より補強部材の全体形状を除いた形状の成形面を有し、該成形面のうち成形品の補強部を成形する補強部成形面を、着脱可能な入子型で形成した成形用金型を用いて、金属素管を液圧成形加工により成形して前記成形品を得て、得られた前記成形品の補強部に前記補強部材を固定することにより部分強化成形製品が製造され、前記補強部は、前記補強部材の形状に合わせて該補強部材の全体形状ぶんだけ、部分強化成形製品の外形形状よりも凹んだ形状に成形され、前記成形品の補強部と該補強部以外の非補強部との間には、成形品に加わる応力により前記非補強部と補強部との間に応力が集中することを回避するための、成形品を緩やかに屈曲させた形状移行部が形成されるものである。 The manufacturing method of a partially reinforced molded product according to claim 2, comprising: a molded product and a reinforcing member made of a molded plate material fixed to a reinforcing portion partially provided in the molded product. It has a molding surface with a shape that excludes the overall shape of the reinforcing member from the outer shape of the reinforced molded product, and the reinforcing part molding surface that molds the reinforcing part of the molded product is formed with a detachable telescopic mold. Using the molding die thus obtained, a metal base tube is molded by a hydraulic molding process to obtain the molded product, and the reinforcing member is fixed to the reinforcing portion of the molded product thus obtained, thereby partially reinforcing the molded product. The reinforcing portion is formed into a shape that is recessed from the outer shape of the partially reinforced molded product by the entire shape of the reinforcing member according to the shape of the reinforcing member, and the reinforcing portion of the molded product Between the non-reinforcing part other than the reinforcing part, it is added to the molded product. To avoid that the stress is concentrated between the reinforcing portion and the non-reinforcing portion due to stress, in which shape transitional portion is gently bent molded article is formed.

本発明の効果として、以下に示すような効果を奏する。   As effects of the present invention, the following effects can be obtained.

請求項1においては、入子型のみを交換することで、複数種類の成形品を得ることができるため、入子型の変更で、全体的な外形形状が略同一であって補強部材形状の異なる部分強化成形製品を製造することが可能となり、コストダウンに寄与することができる。
また、成形品の補強部は補強部材の全体形状ぶんの凹部が形成され、該凹部に補強部材が嵌設されるので、成形品の非補強部と補強部材とによって形成される部分強化成形製品の外形形状において、補強部材が膨出することがなく、補強部材を備えることによる外形形状の変化を低減することができる。
In claim 1, by replacing only the telescopic mold, it is possible to obtain a plurality of types of molded products. Therefore, by changing the telescopic mold, the overall outer shape is substantially the same and the shape of the reinforcing member is the same. Different partially reinforced molded products can be manufactured, which can contribute to cost reduction.
Further, the reinforcing part of the molded product is formed with a concave part of the entire shape of the reinforcing member, and the reinforcing member is fitted into the concave part, so that the partially reinforced molded product formed by the non-reinforcing part of the molded product and the reinforcing member In the outer shape, the reinforcing member does not bulge, and the change in the outer shape due to the provision of the reinforcing member can be reduced.

請求項2においては、成形品の補強部は補強部材の全体形状ぶんの凹部が形成され、該凹部に補強部材が嵌設されるので、成形品の非補強部と補強部材とによって形成される部分強化成形製品の外形形状において、補強部材が膨出することがなく、補強部材を備えることによる外形形状の変化を低減することができる。また、入子型のみを交換することで、複数種類の成形品を得ることができるため、入子型の変更で、全体的な外形形状が略同一であって補強部材形状の異なる部分強化成形製品を製造することが可能となり、補強部材の厚み変更に柔軟に対応することができる。   According to the second aspect of the present invention, the recessed portion of the overall shape of the reinforcing member is formed in the reinforcing portion of the molded product, and the reinforcing member is fitted into the recessed portion, so that it is formed by the non-reinforcing portion of the molded product and the reinforcing member. In the outer shape of the partially reinforced molded product, the reinforcing member does not bulge, and the change in the outer shape due to the provision of the reinforcing member can be reduced. In addition, because only multiple insert molds can be replaced, multiple types of molded products can be obtained. The product can be manufactured, and the thickness change of the reinforcing member can be flexibly dealt with.

次に、発明の実施の形態を説明する。
図1は本発明の実施例に係る部分強化成形製品の断面図、図2は成形品を成形する成形用金型を示す図、図3は液圧成形加工時の成形用金型の様子を図である。図4は本発明の実施例に係る部分強化成形製品の断面図である。
図5は従来の部分強化成形製品の断面図である。
Next, embodiments of the invention will be described.
FIG. 1 is a cross-sectional view of a partially reinforced molded product according to an embodiment of the present invention, FIG. 2 is a diagram showing a molding die for molding a molded product, and FIG. 3 is a state of the molding die during a hydraulic molding process. FIG. FIG. 4 is a cross-sectional view of a partially reinforced molded product according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a conventional partially reinforced molded product.

図1(a)(b)に示すように、本発明に係る部分強化成形製品10は、成形品11と、該成形品11に固定された補強部材12とで構成される。部分強化成形製品10は、補強部材12にて成形品11を部分的に補強したものであり、成形品11に対して補強部材12は溶接等によって固定される。このような部分強化成形製品10は、例えば、サスペンションメンバーに用いられるサイドフレームやクロスメンバーなどの自動車の構造部材とすることができる。   As shown in FIGS. 1A and 1B, a partially reinforced molded product 10 according to the present invention includes a molded product 11 and a reinforcing member 12 fixed to the molded product 11. The partially reinforced molded product 10 is obtained by partially reinforcing a molded product 11 with a reinforcing member 12, and the reinforcing member 12 is fixed to the molded product 11 by welding or the like. Such a partial reinforcement | strengthening molded product 10 can be used as the structural member of motor vehicles, such as a side frame used for a suspension member, and a cross member.

前記部分強化成形製品10を構成する補強部材12は、プレス加工などによって、金属板材が断面略L字状や断面略コ字状などの成形品11の補強部11bに合わせた形状に成形された成形板材である。   The reinforcing member 12 constituting the partially reinforced molded product 10 is formed by press working or the like into a shape in which the metal plate material is matched to the reinforcing portion 11b of the molded product 11 such as a substantially L-shaped section or a substantially U-shaped section. Molded plate material.

また、部分強化成形製品10を構成する成形品11は、液圧成形加工にて成形されたものであり、非補強部11aと補強部11bとが形成される。補強部材12と成形品11の非補強部11aにて、部分強化成形製品10の所定の外形形状(設計に沿った部分強化成形製品10の外形形状)が形成される。   Moreover, the molded product 11 which comprises the partial reinforcement | strengthening molded product 10 is shape | molded by the hydraulic molding process, and the non-reinforcement part 11a and the reinforcement part 11b are formed. A predetermined outer shape of the partially reinforced molded product 10 (outer shape of the partially reinforced molded product 10 according to the design) is formed by the reinforcing member 12 and the non-reinforced portion 11a of the molded product 11.

非補強部11aは、成形品11のうち補強を要しない部分であり、部分強化成形製品10の外形形状の一部を形成する。該非補強部11aは、部分強化成形製品10の所定の外形形状に倣って成形される。   The non-reinforcing portion 11 a is a portion of the molded product 11 that does not require reinforcement, and forms a part of the outer shape of the partially reinforced molded product 10. The non-reinforcing portion 11a is molded following a predetermined outer shape of the partially reinforced molded product 10.

一方、補強部11bは、成形品11のうち補強部材12を固定して強度を向上させる部分であり、補強部材12の形状に合わせて該補強部材12の全体形状ぶんだけ、部分強化成形製品10の外形形状よりも凹んだ形状に成形される。なお、成形品11の補強部11bと非補強部11aとの間には、成形品11に加わる応力により非補強部11aと補強部11bとの間に応力が集中することを回避するために、成形品11を緩やかに屈曲させた形状移行部が形成される。   On the other hand, the reinforcing portion 11b is a portion of the molded article 11 that fixes the reinforcing member 12 to improve the strength, and only the entire shape of the reinforcing member 12 according to the shape of the reinforcing member 12 is the partially reinforced molded product 10. It is formed into a shape that is recessed from the outer shape. In addition, in order to avoid that stress concentrates between the non-reinforcing part 11a and the reinforcing part 11b due to the stress applied to the molded article 11 between the reinforcing part 11b and the non-reinforcing part 11a of the molded article 11. A shape transition portion in which the molded article 11 is gently bent is formed.

そして、この成形品11の補強部11bに形成された補強部材12の全体形状ぶんの凹部に、補強部材12が嵌設される。従って、成形品11の非補強部11aと補強部材12とによって形成される部分強化成形製品10の外形形状において、補強部材12が膨出することがなく、補強部材12を備えることによる外形形状の変化を低減することができる。   Then, the reinforcing member 12 is fitted into the recess of the overall shape of the reinforcing member 12 formed in the reinforcing portion 11b of the molded product 11. Therefore, in the outer shape of the partially reinforced molded product 10 formed by the non-reinforcing portion 11a and the reinforcing member 12 of the molded product 11, the reinforcing member 12 does not bulge, and the outer shape by providing the reinforcing member 12 Changes can be reduced.

続いて、上記部分強化成形製品10の製造方法について説明する。   Then, the manufacturing method of the said partial reinforcement | strengthening molded product 10 is demonstrated.

前述の通り、部分強化成形製品10の成形品11は、液圧成形加工にて成形される。図2に示すように、成形品11を成形する成形用金型20は、上下一対の上金型21及び下金型22と、該下金型22に設けられた嵌合部22aに嵌設された入子型24とで構成される。   As described above, the molded product 11 of the partially reinforced molded product 10 is molded by a hydraulic molding process. As shown in FIG. 2, a molding die 20 for molding the molded product 11 is fitted in a pair of upper and lower upper molds 21 and 22 and a fitting portion 22 a provided in the lower mold 22. And the nested mold 24.

上金型21と下金型22との合わせ面には、成形品が成形される成形形状の中空部が形成される。また、入子型24はこの中空部における上金型21または下金型22に面して配置される。
この中空部の、上金型21または下金型22の内周面と、入子型24の内周面とにより、成形用金型20における、成形品11の外形形状を成形する成形面23が形成されている。
そして、この成形用金型20の成形面23において、少なくとも成形品11の補強部11bを成形する部分は、入子型24により構成される。
On the mating surface of the upper mold 21 and the lower mold 22, a hollow portion having a molded shape in which a molded product is molded is formed. Further, the insert mold 24 is disposed facing the upper mold 21 or the lower mold 22 in the hollow portion.
A molding surface 23 for molding the outer shape of the molded product 11 in the molding die 20 by the inner peripheral surface of the upper mold 21 or the lower mold 22 and the inner peripheral surface of the insert mold 24 in the hollow portion. Is formed.
In the molding surface 23 of the molding die 20, at least a portion for molding the reinforcing portion 11 b of the molded product 11 is constituted by the nested die 24.

すなわち、成形用金型20の成形面23は、部分強化成形製品10の外形形状より補強部材12の全体形状を除いた形状であって、そのうち、成形品11の補強部11bを成形する補強部成形面24aは、入子型24にて形成される。   That is, the molding surface 23 of the molding die 20 has a shape obtained by excluding the overall shape of the reinforcing member 12 from the outer shape of the partially reinforced molded product 10, and among them, the reinforcing portion that molds the reinforcing portion 11 b of the molded product 11. The molding surface 24 a is formed by the telescopic mold 24.

上述の構成の成形用金型20において、その成形面23内に金属素管30が挿入され、該金属素管30に液圧成形加工が施される。液圧成形加工では、金属素管30内に液体が導入され、液体に圧力が負荷されるとともに、必要に応じて管端から軸方向に圧縮力が加えられることによって、図3に示すように、金属素管30が膨出し、成形面23の形状に倣った管状の成形品11が得られる。そして、成形品11の補強部11bに、補強部材12が溶接固定され、部分強化成形製品10が製造される。   In the molding die 20 having the above-described configuration, the metal element tube 30 is inserted into the molding surface 23, and the metal element tube 30 is subjected to a hydraulic forming process. In the hydroforming process, a liquid is introduced into the metal base tube 30, pressure is applied to the liquid, and a compressive force is applied in the axial direction from the end of the tube as necessary, as shown in FIG. Then, the metal base tube 30 swells, and a tubular molded product 11 that follows the shape of the molding surface 23 is obtained. And the reinforcement member 12 is fixed by welding to the reinforcement part 11b of the molded product 11, and the partial reinforcement | strengthening molded product 10 is manufactured.

前記成形用金型20の構成部材の一つである入子型24は、下金型22に対して着脱可能であり、異なる形状の補強部成形面24aを有する入子型24と置換可能である。従って、同一の上金型21と下金型22とを用いて異なる補強部11bの形状を有する成形品11を成形することが可能である。   The insert mold 24 which is one of the constituent members of the mold 20 can be attached to and detached from the lower mold 22 and can be replaced with the insert mold 24 having the reinforcing portion forming surface 24a having a different shape. is there. Therefore, it is possible to mold the molded product 11 having the shape of the different reinforcing portions 11 b using the same upper mold 21 and lower mold 22.

例えば、図1(a)に示す部分強化成形製品10と、図1(b)に示す部分強化成形製品10とのように、全体的な外形形状が略同一であって、補強部材12の厚みや形状など、補強部分の形状の異なるものを製造する場合には、成形用金型20として、上下一対の上金型21及び下金型22と、二種類の入子型24を用意すれば良い。   For example, like the partially reinforced molded product 10 shown in FIG. 1A and the partially reinforced molded product 10 shown in FIG. 1B, the overall outer shape is substantially the same, and the thickness of the reinforcing member 12 In the case of manufacturing a reinforcing part having a different shape such as a shape, a pair of upper and lower upper molds 21 and 22 and two types of nested molds 24 are prepared as the molding mold 20. good.

つまり、略同一の外形形状の部分強化成形製品10であって、成形品11の補強部11bの形状のみが異なるものを成形する場合、二種類目以降の成形品を成形するに際して、上金型21や下金型22を新たに製作する必要はないのである。入子型24は、上金型21や下金型22と比較して、安価に製作することができ、コストダウンに寄与することができる。   That is, when molding a partially reinforced molded product 10 having substantially the same outer shape and only the shape of the reinforcing portion 11b of the molded product 11 is different, when molding the second and subsequent molded products, the upper mold There is no need to newly manufacture 21 or the lower mold 22. The insert mold 24 can be manufactured at a lower cost than the upper mold 21 and the lower mold 22, and can contribute to cost reduction.

また、上述のように製造される部分強化成形製品10は、図1(a)と図1(b)とに示すように、補強部材12の厚みを変化させた場合でも、略同一の外形形状を有するものとすることができる。よって、部分強化成形製品10の強度変更をしても、該部分強化成形製品10を固定する周辺部材の形状変更を不要とすることができ、部分強化成形製品10の強度変更に柔軟に対応することができる。   Further, the partially reinforced molded product 10 manufactured as described above has substantially the same outer shape even when the thickness of the reinforcing member 12 is changed as shown in FIGS. 1 (a) and 1 (b). It can have. Therefore, even if the strength of the partially reinforced molded product 10 is changed, it is possible to eliminate the need to change the shape of the peripheral member that fixes the partially reinforced molded product 10 and flexibly cope with the strength change of the partially reinforced molded product 10. be able to.

なお、本実施例において、入子型24は下金型22に着脱可能に備えているが、上金型21又は下金型22のうち、いずれか一方、若しくは両方に設けることができる。また、一つの成形用金型20に備える入子型24の数は単数に限定されず、複数とすることもできる。さらに、本実施例に係る成形品11は断面略矩形状であり、補強部材12は断面コ字状であるが、本発明はこれらに限定されず、多様な形状の成形品11及び補強部材12とすることができる。   In the present embodiment, the telescopic die 24 is detachably attached to the lower die 22, but can be provided on either one or both of the upper die 21 and the lower die 22. Further, the number of the nested molds 24 provided in one molding die 20 is not limited to a single number, and may be plural. Further, the molded article 11 according to the present embodiment has a substantially rectangular cross section, and the reinforcing member 12 has a U-shaped cross section. However, the present invention is not limited to these, and the molded article 11 and the reinforcing member 12 having various shapes. It can be.

例えば、図4(a)に示すように、本発明に係る成形方法にて、断面L字状の補強部材12を、略矩形閉断面管である成形品11の各角部に固定した、断面略矩形状の部分強化成形製品10を製造することもできる。この場合、上金型21と下金型22のそれぞれに入子型24を嵌設し、少なくとも成形品11の補強部11bを成形する成形面を入子型24で構成する。   For example, as shown to Fig.4 (a), the cross-section which fixed the reinforcing member 12 of L-shaped cross section to each corner | angular part of the molded article 11 which is a substantially rectangular closed cross-section pipe | tube with the shaping | molding method which concerns on this invention. A substantially rectangular partially reinforced molded product 10 can also be manufactured. In this case, the insert mold 24 is fitted in each of the upper mold 21 and the lower mold 22, and at least a molding surface for forming the reinforcing portion 11 b of the molded product 11 is configured by the insert mold 24.

また、例えば、図4(b)に示すように、断面半円状の補強部材12を、円形閉断面管である成形品11に固定した、断面略円状の部分強化成形製品10や、図4(c)に示すように、断面半多角形状の補強部材12を、多角形閉断面管である成形品11に固定した、断面略多角形状の部分強化成形製品10を、本発明に係る成形方法にて製造することができる。   For example, as shown in FIG. 4 (b), a reinforcing member 12 having a semicircular cross section is fixed to a molded product 11 which is a circular closed cross section tube, and a partially reinforced molded product 10 having a substantially circular cross section, 4 (c), a partially reinforced molded product 10 having a substantially polygonal cross section in which a reinforcing member 12 having a semi-polygonal cross section is fixed to a molded product 11 that is a polygonal closed cross-section tube is molded according to the present invention. It can be manufactured by a method.

なお、長尺の部分強化成形製品10の場合、成形品11の長手方向の少なくとも一部に、補強部11bを形成し、該補強部11bに補強部材12を溶接固定することもできる。   In the case of the long partially reinforced molded product 10, the reinforcing portion 11 b can be formed on at least a part of the molded product 11 in the longitudinal direction, and the reinforcing member 12 can be fixed to the reinforcing portion 11 b by welding.

本発明の実施例に係る部分強化成形製品の断面図。Sectional drawing of the partial reinforcement | strengthening molded product which concerns on the Example of this invention. 成形品を成形する成形用金型を示す図。The figure which shows the metal mold | die for shape | molding a molded article. 液圧成形加工時の成形用金型の様子を図。The figure of the mode of the metal mold for molding at the time of hydraulic forming. 本発明の実施例に係る部分強化成形製品の断面図。Sectional drawing of the partial reinforcement | strengthening molded product which concerns on the Example of this invention. 従来の部分強化成形製品の断面図。Sectional drawing of the conventional partial reinforcement | strengthening molded product.

10 部分強化成形製品
11 成形品
11a 非補強部
11b 補強部
12 補強部材
20 成形用金型
21 上金型
22 下金型
24 入子型
24a 補強部成形面

DESCRIPTION OF SYMBOLS 10 Partial reinforcement | strengthening molded product 11 Molded product 11a Non-reinforcement part 11b Reinforcement part 12 Reinforcement member 20 Mold for molding 21 Upper mold 22 Lower mold 24 Nest mold 24a Reinforcement part molding surface

Claims (2)

成形品に部分的に設けられた補強部に、成形板材から成る補強部材を固設して構成される部分強化成形製品の、該成形品を成形するための液圧成形用金型であって、
前記金型の内部に形成される成形面のうち、成形品の補強部を成形する補強部成形面を、金型に対して着脱可能な入子型で形成し、
前記金型の成形面を、部分強化成形製品の外形形状より補強部材の全体形状を除いた形状とし、
前記金型により、前記補強部は、前記補強部材の形状に合わせて該補強部材の全体形状ぶんだけ、部分強化成形製品の外形形状よりも凹んだ形状に成形され、前記成形品の補強部と該補強部以外の非補強部との間には、成形品に加わる応力により前記非補強部と補強部との間に応力が集中することを回避するための、成形品を緩やかに屈曲させた形状移行部が形成される、
ことを特徴とする液圧成形用金型。
A hydraulic molding die for molding a molded product of a partially reinforced molded product constituted by fixing a reinforcing member made of a molded plate material to a reinforcing part partially provided in the molded product. ,
Of the molding surfaces formed inside the mold, the reinforcing part molding surface for molding the reinforcing part of the molded product is formed with a telescopic mold that can be attached to and detached from the mold,
The molding surface of the mold is a shape obtained by removing the overall shape of the reinforcing member from the external shape of the partially reinforced molded product ,
By the mold, the reinforcing portion is formed into a shape recessed by the overall shape of the reinforcing member in accordance with the shape of the reinforcing member, compared to the outer shape of the partially reinforced molded product, Between the non-reinforcing portion other than the reinforcing portion, the molded product is gently bent to avoid stress concentration between the non-reinforcing portion and the reinforcing portion due to stress applied to the molded product. A shape transition is formed,
A hydraulic molding die characterized by the above.
成形品と、該成形品に部分的に設けられた補強部に固設された成形板材から成る補強部材とで構成される、部分強化成形製品の製造方法において、
前記部分強化成形製品の外形形状より補強部材の全体形状を除いた形状の成形面を有し、該成形面のうち成形品の補強部を成形する補強部成形面を、着脱可能な入子型で形成した成形用金型を用いて、
金属素管を液圧成形加工により成形して前記成形品を得て、
得られた前記成形品の補強部に前記補強部材を固定することにより部分強化成形製品が製造され、
前記補強部は、前記補強部材の形状に合わせて該補強部材の全体形状ぶんだけ、部分強化成形製品の外形形状よりも凹んだ形状に成形され、前記成形品の補強部と該補強部以外の非補強部との間には、成形品に加わる応力により前記非補強部と補強部との間に応力が集中することを回避するための、成形品を緩やかに屈曲させた形状移行部が形成される、
ことを特徴とする部分強化成形製品の製造方法。
In a method for manufacturing a partially reinforced molded product, comprising a molded product and a reinforcing member made of a molded plate material fixed to a reinforcing portion partially provided in the molded product,
A nesting mold having a molding surface having a shape obtained by removing the overall shape of the reinforcing member from the outer shape of the partially reinforced molding product, and a detachable telescopic portion for molding the reinforcing portion of the molded product of the molding surface. Using the molding die formed in
The metal base tube is molded by hydroforming to obtain the molded product,
A partially reinforced molded product is manufactured by fixing the reinforcing member to the reinforcing part of the obtained molded product ,
The reinforcing portion is formed into a shape that is recessed from the outer shape of the partially reinforced molded product by the entire shape of the reinforcing member according to the shape of the reinforcing member, and other than the reinforcing portion of the molded product and the reinforcing portion. Between the non-reinforcing part, there is formed a shape transition part that gently bends the molded product to avoid stress concentration between the non-reinforcing part and the reinforcing part due to stress applied to the molded product. To be
A method for producing a partially reinforced molded product.
JP2005127766A 2005-04-26 2005-04-26 Liquid pressure molding die and method for producing partially reinforced molded product Expired - Fee Related JP4701814B2 (en)

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JP2000271665A (en) * 1999-03-29 2000-10-03 Nisshin Steel Co Ltd Hydroforming die
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JP2004291030A (en) * 2003-03-27 2004-10-21 Nippon Steel Corp Mold for hydroforming

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Publication number Priority date Publication date Assignee Title
JPH115125A (en) * 1997-06-13 1999-01-12 Nissan Motor Co Ltd Forming method for bulge with oil pressure
JP2000271665A (en) * 1999-03-29 2000-10-03 Nisshin Steel Co Ltd Hydroforming die
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