JPWO2019187863A1 - Press-molded product design method, press-molding die, press-molded product, and press-molded product manufacturing method - Google Patents

Press-molded product design method, press-molding die, press-molded product, and press-molded product manufacturing method Download PDF

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JPWO2019187863A1
JPWO2019187863A1 JP2019562013A JP2019562013A JPWO2019187863A1 JP WO2019187863 A1 JPWO2019187863 A1 JP WO2019187863A1 JP 2019562013 A JP2019562013 A JP 2019562013A JP 2019562013 A JP2019562013 A JP 2019562013A JP WO2019187863 A1 JPWO2019187863 A1 JP WO2019187863A1
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JP6738055B2 (en
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祐太 仮屋▲崎▼
祐太 仮屋▲崎▼
雄司 山▲崎▼
雄司 山▲崎▼
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/02—Stamping using rigid devices or tools
    • B21D22/04—Stamping using rigid devices or tools for dimpling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

スプリングバックに起因するプレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制して、スプリングバックによるプレス成形品の形状不良を抑制することを課題とし、板状材料からプレス成形されるプレス成形品の形状を設計するに際し、前記プレス成形品に配置した付加形状が有する、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状における、凹曲げ部の曲率半径（Ｒ１）と凸曲げ部の曲率半径（Ｒ２）を同一にすることを特徴としている。It is an object to suppress the drop or jump of the end of the press-formed product and the twist of the press-formed product due to the springback, and to suppress the shape defect of the press-formed product due to the springback. In designing the shape of a press-formed product, the radius of curvature (R1) and the convexity of the concave-bent part in the concave-convex bent shape in which the concave-bent portion and the convex-bent portion are continuous, which the additional shape arranged in the press-formed article has, It is characterized in that the bending portions have the same radius of curvature (R2).

Description

本発明は、板状材料からプレス成形されるプレス成形品の、プレス成形金型からの離型時のスプリングバックによる、成形品端部の落ち込みや跳ね上がり、全体的なねじれ等の形状不良を抑制するための、プレス成形品の設計方法、プレス成形金型、プレス成形品およびプレス成形品の製造方法に関するものである。  INDUSTRIAL APPLICABILITY The present invention suppresses a shape defect such as a drop or a jump of an end portion of a molded product due to a springback at the time of releasing a press molded product press-molded from a plate-shaped material from a press molding die, and an overall twist. The present invention relates to a method for designing a press-molded product, a press-molding die, a press-molded product, and a method for manufacturing the press-molded product, in order to achieve the above.

近年、燃費の向上を目的とした自動車車体の軽量化のため、高強度鋼板の適用拡大が進んでいる。高強度鋼板を適用することによって、板厚を大きくすることなく自動車車体の強度、剛性や衝突時の吸収エネルギーを高めることができる。  In recent years, the application of high-strength steel sheets has been expanded in order to reduce the weight of automobile bodies for the purpose of improving fuel efficiency. By applying the high-strength steel plate, the strength and rigidity of the automobile body and the absorbed energy at the time of collision can be increased without increasing the plate thickness.

しかしながら、一般に自動車の車体部品の加工に多用されているプレス成形においては、スプリングバックと呼ばれる形状凍結不良が問題となる。スプリングバックは、板状材料としての鋼板からプレス成形したプレス成形品をプレス成形金型から離型する際に生じ、鋼板の材料強度が高くなるのに伴って大きくなる。スプリングバックによる形状不良は、外観品質を損なうだけでなく車体組立て時の溶接不良の原因ともなるため、高強度鋼板の適用拡大には、スプリングバック対策が必要不可欠である。  However, in press molding, which is generally used for processing car body parts, a problem of shape freeze called springback becomes a problem. Springback occurs when a press-formed product obtained by press-forming from a steel plate as a plate-shaped material is released from the press-molding die, and increases as the material strength of the steel plate increases. A shape defect due to springback not only impairs the appearance quality but also causes a welding defect at the time of assembling the vehicle body. Therefore, springback measures are indispensable for expanding the application of high-strength steel sheets.

スプリングバックの原因は、残留応力の不均一によって生じる曲げモーメントがプレス成形品の離型時に解放されることによる弾性回復である。このため従来からスプリングバック対策として、残留応力の不均一を緩和させる方法やプレス成形品の剛性を向上させることでスプリングバックを低減させる方法が提案されている。また、曲げモーメントの低減、プレス成形品の剛性向上、材料流量コントロール等を目的に、付加形状を中間成形品あるいは最終成形品に配置することがあり、この付加形状を効果的に配置することで、プレス成形品の割れ、しわの低減や寸法精度の向上を図る技術が提案されている。  The cause of spring back is elastic recovery due to the bending moment generated by non-uniformity of residual stress being released when the press-formed product is released. For this reason, conventionally, as a springback countermeasure, there have been proposed a method of reducing unevenness of residual stress and a method of reducing springback by improving rigidity of a press-formed product. Also, for the purpose of reducing bending moment, improving the rigidity of press-molded products, controlling the material flow rate, etc., additional shapes may be placed in intermediate molded products or final molded products. , A technique for reducing cracks and wrinkles in press-formed products and improving dimensional accuracy has been proposed.

例えば特許文献１では、付加形状として、伸びフランジ部にエンボスを配置し、縮みフランジ部に余肉ビードを形成した中間成形品を成形し、その後の最終成形品の成形において、伸びフランジ部はエンボスを潰すことで圧縮応力を与え、縮みフランジ部は余肉ビードによって引張応力を与えることで、プレス成形品の残留応力分布を平準化する技術が提案されている。  For example, in Patent Document 1, as an additional shape, an emboss is arranged on a stretch flange portion, an intermediate molded product in which a shrinkage flange portion is formed with a surplus bead is molded, and in the subsequent molding of a final molded product, the stretch flange portion is embossed. There is proposed a technique for leveling the residual stress distribution of a press-formed product by applying compressive stress by crushing and compressing the shrinkage flange part by applying tensile stress with the bead of excess thickness.

特許文献２では、付加形状として、金属板にダイス肩の長手方向に沿って矩形もしくは円形断面の溝形状を複数配置することで、金属板がダイス肩を通過する際に受ける曲げ・曲げ戻し変形モーメントおよび通過後の金属板内の残留応力を低減させ、除荷後のスプリングバックによるそり変形を軽減する技術が提案されている。  In Patent Document 2, as additional shapes, a plurality of groove shapes having a rectangular or circular cross section are arranged on the metal plate along the longitudinal direction of the die shoulder, so that the metal plate undergoes bending/bending-back deformation when passing through the die shoulder. A technique has been proposed in which the moment and the residual stress in the metal plate after passing are reduced, and the warp deformation due to springback after unloading is reduced.

特許文献３では、湾曲したパネル端部から折曲されて縮みフランジとなる湾曲したフランジの成形の際に、付加形状として、フランジにその長手方向に並べて凸形状を複数形成することで、フランジに生じる長手方向の圧縮力を吸収し、フランジのスプリングバックによるパネルの面下がりを抑制する技術が提案されている。  In Patent Document 3, when forming a curved flange that is bent from a curved panel end portion to be a contracting flange, a plurality of convex shapes are formed on the flange by arranging them in the longitudinal direction as an additional shape. A technique has been proposed that absorbs a compressive force generated in the longitudinal direction and suppresses the panel from being lowered due to the springback of the flange.

特許第５３８０８９０号公報Patent No. 5380890 特開平０８−２８１３３５号公報JP, 08-281335, A 特開平０７−１１２２１９号公報JP, 07-112219, A

特許文献１は、付加形状として、伸びフランジ部にエンボス、縮みフランジ部に余肉ビードを形成して残留応力を平準化させることで、スプリングバックを低減させる方法を提案しているが、本発明が主に対象としている低剛性形状のプレス成形品は、低応力でもスプリングバックが生じるため、特定部分の応力を低減させても不十分な場合がある。また、特定部分の応力を低減させた結果生じる新たな応力状態で、別の形態のスプリングバックが生じる場合もある。それゆえ、低剛性形状のプレス成形品においては、応力コントロールによって効率的にスプリングバック対策を行うのは困難である。  Patent Document 1 proposes a method of reducing springback by forming an emboss on the stretch flange portion and forming a surplus bead on the shrink flange portion as an additional shape to level the residual stress. The low-rigidity press-molded product, which is mainly targeted at, causes springback even at low stress, and thus it may not be sufficient to reduce the stress at a specific portion. Further, another form of springback may occur in a new stress state resulting from the reduction of the stress in a specific portion. Therefore, it is difficult to efficiently take measures against springback in stress-controlled press-molded products by controlling stress.

特許文献２は、金属板に矩形もしくは円形断面の溝形状を配置することで、金属板内の残留応力を低減させ、除荷後のそり変形を軽減する技術を提案しており、特許文献３は、縮みフランジとなる湾曲したフランジを有するパネルの成形においてフランジに凸形状を形成することで、パネルの面下がりを抑制する技術を提案しているが、付加形状における曲げ部の曲率半径については特に規定していない。平坦面から突出もしくは凹陥している付加形状はその周縁部に、凹曲げ部と凸曲げ部とが連続した略Ｓ字状断面の凹凸曲げ形状を有しており、一般に、それらの曲げ部のスプリングバックは曲率半径に応じて変化するため、付加形状をプレス成形品に付与する際には、その付加形状における凹凸曲げ形状の曲げ部を適切な曲率半径に設計する必要があるが、特許文献２，３では、付加形状における凹凸曲げ形状の曲げ部の曲率半径の設計方法については記載されていない。  Patent Document 2 proposes a technique of arranging a groove shape having a rectangular or circular cross section on a metal plate to reduce residual stress in the metal plate and reduce warp deformation after unloading. Proposes a technique to suppress the panel surface down by forming a convex shape on the flange in the molding of a panel having a curved flange to be a contracting flange.However, regarding the radius of curvature of the bent part in the additional shape, Not specified. The additional shape protruding or recessed from the flat surface has a concave-convex bent shape of a substantially S-shaped cross section in which a concave bent portion and a convex bent portion are continuous at the peripheral edge thereof. Since the springback changes according to the radius of curvature, when giving the additional shape to the press-formed product, it is necessary to design the bent portion of the concave-convex shape of the additional shape to have an appropriate radius of curvature. No. 2 and 3 do not describe a method of designing the radius of curvature of the bent portion of the concavo-convex bent shape in the additional shape.

即ち、従来技術の解決すべき課題を列記すると以下のようになる。
(1) 低剛性形状のプレス成形品へのスプリングバック対策に有効な成形品形状とすること。
(2) 低剛性形状のプレス成形品のスプリングバックに起因する形状不良を低減させるために有効な付加形状を設計できるようにすること。That is, the problems to be solved by the conventional technology are listed below.
(1) Use a molded product shape that is effective as a springback measure for press-molded products with low rigidity.
(2) To be able to design additional shapes that are effective in reducing shape defects due to springback of low-rigidity press-formed products.

ところで従来から、プレス成形品の形状設計の際には、接合部のような高い面精度が要求される部位の座面の面積を大きくするために曲げ部の曲率半径を小さくしたり、割れ回避のために曲げ部の曲率半径を大きくしたりするといった曲率半径の変更が行われてきたが、上述したように曲げ部は、曲率半径が大きい程スプリングバック量（スプリングバック角）が大きくなることが知られている。  By the way, conventionally, when designing the shape of a press-molded product, the radius of curvature of the bent part is reduced or cracking is avoided in order to increase the seating surface area of the part where high surface accuracy is required such as the joint part. Therefore, the radius of curvature has been changed by increasing the radius of curvature of the bent portion, but as described above, the larger the radius of curvature of the bent portion, the larger the springback amount (springback angle). It has been known.

この曲げ部の曲率半径とスプリングバック量との関連について、低剛性形状のプレス成形品へのスプリングバック対策のために本発明者が検討を進めたところ、凹曲げ部と凸曲げ部とが連続した略Ｓ字状断面の凹凸曲げ形状においては、凹曲げ部と凸曲げ部との曲率半径が異なっていると、凹曲げ部で発生するスプリングバック量と凸曲げ部で発生するスプリングバック量とが異なったものになるため、凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後に平行にならず、高さ方向の変位が生じるということが判明した。  Regarding the relationship between the radius of curvature of the bent portion and the amount of springback, the inventors of the present invention have studied to prevent the springback of a press-molded product having a low rigidity shape. As a result, the concave bent portion and the convex bent portion are continuous. In the concavo-convex bent shape having the substantially S-shaped cross section, when the concave and convex bent portions have different radii of curvature, the springback amount generated in the concave bent portion and the springback amount generated in the convex bent portion are different from each other. It was found that the flat parts on both sides of the concavo-convex bent shape do not become parallel after the springback, because of the different values, and the displacement in the height direction occurs.

図５（ａ）〜（ｃ）は、凹凸曲げ形状を挟んだ両側の平坦部の断面の、プレス下死点時の状態を点線で示すとともにスプリングバック後の状態を実線で示す説明図であり、（ａ）は凹曲げ部の曲率半径Ｒ１と凸曲げ部の曲率半径Ｒ２とが同一の場合、（ｂ）は凹曲げ部の曲率半径Ｒ１が凸曲げ部の曲率半径Ｒ２よりも大きい場合、（ｃ）は凹曲げ部の曲率半径Ｒ１が凸曲げ部の曲率半径Ｒ２よりも小さい場合をそれぞれ示している。  FIGS. 5A to 5C are explanatory diagrams showing a state at the time of bottom dead center of the press with a dotted line and a state with a solid line after the springback, of the cross section of the flat portions on both sides sandwiching the uneven bending shape. , (A) is the case where the radius of curvature R1 of the concave bent portion is the same as the radius of curvature R2 of the convex bent portion, (b) is the case where the radius of curvature R1 of the concave bent portion is larger than the radius of curvature R2 of the convex bent portion, (C) shows the case where the radius of curvature R1 of the concave bent portion is smaller than the radius of curvature R2 of the convex bent portion.

図５（ａ）に示すように、凹曲げ部の曲率半径Ｒ１と凸曲げ部の曲率半径Ｒ２とが同一の場合、凹曲げ部と凸曲げ部とのスプリングバック量（スプリングバック角）は矢印で示すように同一になる。一方、図５（ｂ）に示すように、凹曲げ部の曲率半径Ｒ１が凸曲げ部の曲率半径Ｒ２よりも大きい場合、凹曲げ部のスプリングバック量（スプリングバック角）は矢印で示すように凸曲げ部のスプリングバック量（スプリングバック角）よりも大きくなる。また、図５（ｃ）に示すように、凹曲げ部の曲率半径Ｒ１が凸曲げ部の曲率半径Ｒ２よりも小さい場合、凹曲げ部のスプリングバック量（スプリングバック角）は矢印で示すように凸曲げ部のスプリングバック量（スプリングバック角）よりも大きくなる。  As shown in FIG. 5A, when the radius of curvature R1 of the concave bending portion and the radius of curvature R2 of the convex bending portion are the same, the springback amount (springback angle) between the concave bending portion and the convex bending portion is an arrow. Will be the same as shown in. On the other hand, as shown in FIG. 5B, when the radius of curvature R1 of the concave bending portion is larger than the radius of curvature R2 of the convex bending portion, the springback amount (springback angle) of the concave bending portion is as indicated by an arrow. It becomes larger than the springback amount (springback angle) of the convex bent portion. Further, as shown in FIG. 5C, when the radius of curvature R1 of the concave bent portion is smaller than the radius of curvature R2 of the convex bent portion, the springback amount (springback angle) of the concave bent portion is as indicated by an arrow. It becomes larger than the springback amount (springback angle) of the convex bent portion.

スプリングバック量（スプリングバック角）の相違による高さ方向の変位は、凹凸曲げ形状から離れる程大きくなるため、この高さ方向変位分布は、プレス成形品の端部の落ち込みや跳ね上がりの原因となり、また、この高さ方向変位分布がプレス成形品の長手方向に対して傾いていれば、プレス成形品のねじれの原因にもなる。そしてこの傾向は、スプリングバックの大きい高強度材料や低剛性のプレス成形品で顕著である。  The displacement in the height direction due to the difference in the amount of spring back (spring back angle) becomes larger as it goes away from the concavo-convex bent shape, so this displacement distribution in the height direction causes the end part of the press-formed product to fall or jump up, Further, if the displacement distribution in the height direction is inclined with respect to the longitudinal direction of the press-formed product, it may cause the press-formed product to be twisted. And this tendency is remarkable in a high strength material having a large springback and a press molded product having a low rigidity.

本発明は、本発明者の上述した知見に鑑みて従来技術の課題を解決するためになされたもので、低剛性形状のプレス成形品のスプリングバック後の形状不良を低減させるために有効な凹凸曲げ形状を設計できるプレス成形品の設計方法並びに、その設計方法を用いたプレス成形金型、プレス成形品およびプレス成形品の製造方法を提供することを目的としている。  The present invention has been made in order to solve the problems of the prior art in view of the above-mentioned findings of the present inventor, and unevenness effective for reducing shape defects after springback of a press-formed product having a low rigidity shape. An object of the present invention is to provide a method for designing a press-formed product capable of designing a bending shape, and a press-molding die, a press-formed product and a method for manufacturing the press-formed product using the designing method.

本発明のプレス成形品の設計方法は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、
板状材料からプレス成形されるプレス成形品の形状を設計するに際し、
前記プレス成形品に配置した付加形状が有する、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状における、凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることを特徴としている。The design method of the press-formed product of the present invention is
In order to suppress the defective shape of the press-molded product due to springback when releasing the press-molded product,
When designing the shape of a press-formed product that is press-formed from a plate-shaped material,
It is characterized in that the radius of curvature of the concave bending portion and the radius of curvature of the convex bending portion are the same in the concave and convex bending shape in which the concave bending portion and the convex bending portion are continuous, which the additional shape arranged in the press-formed product has. .

また、上記設計方法を用いた本発明のプレス成形金型は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、
凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を配置したプレス成形品を板状材料からプレス成形するプレス成形金型であって、
前記プレス成形品に配置した付加形状が有する凸曲げ形状における凹曲げ部と凸曲げ部とをそれぞれ成形する肩部を有する金型部材を具え、
それらの金型部材の肩部の曲率半径が同一であることを特徴としている。Further, the press mold of the present invention using the above design method,
In order to suppress the defective shape of the press-molded product due to springback when releasing the press-molded product,
A press-molding die for press-molding a press-formed product in which an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are arranged is press-formed from a plate-shaped material,
A mold member having a shoulder portion for forming each of the concave bending portion and the convex bending portion in the convex bending shape having the additional shape arranged in the press-formed product,
The mold members are characterized in that the shoulders have the same radius of curvature.

そして、上記設計方法を用いた本発明のプレス成形品は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、
板状材料からプレス成形されるとともに、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状が配置されたプレス成形品であって、
その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径が同一であることを特徴としている。Then, the press-formed product of the present invention using the above design method,
In order to suppress the defective shape of the press-molded product due to springback when releasing the press-molded product,
A press-formed product in which an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are arranged is arranged while being press-formed from a plate-shaped material,
It is characterized in that the radius of curvature of the concave bent portion and the radius of curvature of the convex bent portion in the concavo-convex bent shape are the same.

さらに、本発明のプレス成形品の製造方法は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を配置したプレス成形品を板状材料からプレス成形によって製造するに際し、
その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることを特徴としている。
なお、この明細書において「同一」とは、一方の曲率半径に対して他方の曲率半径が、好ましくは±１０％の範囲内にあればよく、より好ましくは±５％の範囲内にあればよい。Furthermore, the method for producing a press-formed product of the present invention,
In order to suppress the defective shape of the press-molded product due to springback when the press-molded product is released, a plate-shaped press-formed product with an additional shape having a concavo-convex bent shape in which concave and convex bends are continuous is arranged. When manufacturing from material by press molding,
It is characterized in that the radius of curvature of the concave bent portion and the radius of curvature of the convex bent portion in the concavo-convex bent shape are the same.
In this specification, "same" means that the radius of curvature of one is preferably within the range of ±10% with respect to the radius of curvature of one, and more preferably within the range of ±5%. Good.

本発明のプレス成形品の設計方法によれば、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状をプレス成形品に配置するとともに、その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることから、プレス成形品の凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後にそのスプリングバック量にかかわらず互いに平行になるため、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。  According to the method for designing a press-formed product of the present invention, an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are continuous is arranged in the press-formed product, and the curvature of the concave bent portion in the concave-convex bent shape is arranged. Since the radius and the radius of curvature of the convex bend are the same, the flat parts on both sides of the concave-convex bent shape of the press-formed product become parallel to each other after spring-back regardless of the spring-back amount. It is possible to suppress the falling or jumping of the end portion and the twist of the press-molded product, and it is possible to suppress the defective shape of the press-molded product due to springback.

また本発明のプレス成形金型によれば、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を配置したプレス成形品を板状材料からプレス成形するプレス成形金型の、凹凸曲げ形状における凹曲げ部と凸曲げ部とをそれぞれ成形する肩部を有する金型部材の、それらの肩部の断面の曲率半径が同一であることから、プレス成形品の、それらの肩部で凹曲げ部と凸曲げ部とを形成される凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後にそのスプリングバック量にかかわらず互いに平行になるため、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。  Further, according to the press-molding die of the present invention, a press-molding die for press-molding a press-formed product in which an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are arranged is press-formed from a plate-shaped material, Since the die members having shoulders for respectively forming the concave and convex bends in the concave-convex shape have the same radius of curvature in the cross section of the shoulders, the shoulders of the press-formed product. Since the flat parts on both sides of the concave-convex shape that forms the concave and convex bends are parallel to each other after springback regardless of the amount of springback, the end of the press-formed product will fall or jump up. And the twist of the press-formed product can be suppressed, and the defective shape of the press-formed product due to springback can be suppressed.

そして本発明のプレス成形品およびプレス成形品の製造方法によれば、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状が配置され、その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径が同一であることから、プレス成形品の凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後にそのスプリングバック量にかかわらず互いに平行になるため、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。  Then, according to the press-formed product and the method for manufacturing the press-formed product of the present invention, an additional shape having a concavo-convex bent shape in which the concave bent portion and the convex bent portion are continuous is arranged, and the curvature of the concave bent portion in the concave-convex bent shape is arranged. Since the radius and the radius of curvature of the convex bent part are the same, the flat parts on both sides of the concave-convex bent shape of the press-formed product become parallel to each other after spring-back regardless of the spring-back amount. It is possible to suppress the falling or jumping of the end portion and the twist of the press-molded product, and it is possible to suppress the defective shape of the press-molded product due to springback.

なお、本発明のプレス成形品の設計方法、プレス成形金型、プレス成形品およびプレス成形品の製造方法においては、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状は、プレス成形品の剛性向上のために付加されるものであってもよい。このようにすれば、付加形状によってプレス成形品の剛性を向上させてスプリングバック量を低減させつつ、スプリングバックによるプレス成形品の形状不良を抑制することができる。  In the method for designing a press-molded product, the press-molding die, the press-molded product and the method for manufacturing a press-molded product of the present invention, an additional shape having a concave-convex bent shape in which a concave bent portion and a convex bent portion are continuous, It may be added to improve the rigidity of the press-formed product. With this configuration, it is possible to improve the rigidity of the press-formed product by the additional shape and reduce the amount of springback, and at the same time, suppress the shape defect of the press-formed product due to springback.

本発明の一実施形態のプレス成形品の設計方法で設計された、本発明の一実施形態のプレス成形品を示す斜視図である。FIG. 6 is a perspective view showing a press-formed product according to an embodiment of the present invention, which is designed by a method for designing a press-formed product according to the embodiment of the present invention. （ａ），（ｂ）は、上記実施形態のプレス成形品の剛性形状の、図１中のＡ−Ａ線およびＢ−Ｂ線に沿う断面図である。(A), (b) is sectional drawing which follows the AA line and BB line in FIG. 1 of the rigid shape of the press-formed product of the said embodiment. 比較例のプレス成形品のスプリングバック解析による高さ方向変位分布を変位等高線（コンター）で示す平面図である。It is a top view which shows the displacement distribution of the height direction by springback analysis of the press-molded article of a comparative example with a displacement contour line (contour). 上記実施形態のプレス成形品のスプリングバック解析による高さ方向変位分布を変位等高線（コンター）で示す平面図である。It is a top view which shows the height direction displacement distribution by the spring back analysis of the press-formed product of the said embodiment by a displacement contour line (contour). （ａ）〜（ｃ）は、凹凸曲げ形状を挟んだ両側の平坦部の断面の、プレス下死点時の状態を点線で示すとともにスプリングバック後の状態を実線で示す説明図であり、（ａ）は凹曲げ部の曲率半径Ｒ１と凸曲げ部の曲率半径Ｒ２とが同一の場合、（ｂ）は凹曲げ部の曲率半径Ｒ１が凸曲げ部の曲率半径Ｒ２よりも大きい場合、（ｃ）は凹曲げ部の曲率半径Ｒ１が凸曲げ部の曲率半径Ｒ２よりも小さい場合をそれぞれ示している。(A)-(c) is explanatory drawing which shows the state at the time of a press bottom dead center of the cross section of the flat part of both sides which pinched|interposed the uneven|corrugated bending shape with a dotted line, and shows the state after a spring back with a solid line. In (a), when the radius of curvature R1 of the concave bent portion and the radius of curvature R2 of the convex bent portion are the same, (b) in the case where the radius of curvature R1 of the concave bent portion is larger than the radius of curvature R2 of the convex bent portion, (c) ) Indicates the case where the radius of curvature R1 of the concave bent portion is smaller than the radius of curvature R2 of the convex bent portion.

以下、本発明の実施形態につき、図面に基づき詳細に説明する。ここに、図１は、本発明の一実施形態のプレス成形品の設計方法で設計された、本発明の一実施形態のプレス成形品を示す斜視図、図２（ａ）および図２（ｂ）は、上記実施形態のプレス成形品の剛性形状の、図１中のＡ−Ａ線およびＢ−Ｂ線に沿う断面図、図３は、比較例としての元の形状のプレス成形品のスプリングバック解析による高さ方向変位分布を変位等高線（コンター）で示す平面図、そして図４は、上記実施形態のプレス成形品のスプリングバック解析による高さ方向変位分布を変位等高線（コンター）で示す平面図であり、図中、符号１はプレス成形品を示す。  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Here, FIG. 1 is a perspective view showing a press-formed product according to an embodiment of the present invention, which is designed by a method for designing a press-formed product according to an embodiment of the present invention, and FIGS. 2(a) and 2(b). ) Is a cross-sectional view of the rigid shape of the press-formed product of the above embodiment, taken along the lines AA and BB in FIG. 1, and FIG. 3 is a spring of the press-formed product of the original shape as a comparative example. FIG. 4 is a plan view showing the displacement distribution in the height direction by the back analysis with displacement contour lines (contours), and FIG. 4 is the plane showing the displacement distribution in the height direction by the spring back analysis with the displacement contour lines (contours) in the above-described embodiment. It is a figure, and the code|symbol 1 shows a press molded article in the figure.

上記実施形態のプレス成形品の設計方法は、自動車の車体部品の一種であるフロントピラーロアインナー材とされるプレス成形品１を設計するためのものであり、このプレス成形品１は、図１に示すような付加形状２，３がなければ、曲がり易くかつねじれ易い薄い台状形状すなわち低剛性の形状を有している。なお、自動車車体部品とされるプレス成形品は、そのような低剛性の形状を有している場合が多い。それゆえこのプレス成形品１では、平面視が長円状で頂面が平坦な２つの付加形状２，３を、薄い台状形状における平坦面に剛性向上のために付加している。  The method for designing a press-formed product according to the above-described embodiment is for designing a press-formed product 1 that is a front pillar lower inner material, which is a kind of vehicle body part of an automobile. If there is no additional shape 2 or 3 as shown in (3), it has a thin trapezoidal shape that is easily bent and twisted, that is, a low rigidity shape. It should be noted that the press-molded products used as automobile body parts often have such a low-rigidity shape. Therefore, in this press-formed product 1, two additional shapes 2 and 3 having an oval shape in plan view and a flat top surface are added to the flat surface in the thin trapezoidal shape for improving rigidity.

上記のプレス成形品１における付加形状２，３は、図２（ａ），（ｂ）に断面形状を示すように、周縁部に各々、凹曲げ部と凸曲げ部とが連続した略Ｓ字状断面の凹凸曲げ形状４を有しており、このプレス成形品１の形状を設計するに際し、元の形状では、凹凸曲げ形状４における凹曲げ部の半径Ｒ１と凸曲げ部の半径Ｒ２とが、例えば図５（ｂ）に示すように、互いに異なる値すなわちＲ１＞Ｒ２に設定されていた。この元の形状のプレス成形品１についてコンピュータで既知のソフトウェアを用いてプレス成形解析およびスプリングバック解析を実施したところ、図３に符号Ｏの点を基準高さとする変位等高線で示すように、付加形状３より左側で、負側のＺ方向変位が大きくなっていることから大きく落ち込んでいることが判り、また付加形状２から左上方向で、負側のＺ方向変位がさらに大きくなっていることからプレス成形品１がねじれていることが判る。  The additional shapes 2 and 3 in the above press-formed product 1 are substantially S-shaped in which a concave bent portion and a convex bent portion are continuous in the peripheral edge portion, respectively, as shown in the cross-sectional shapes in FIGS. 2(a) and 2(b). When the shape of the press-formed product 1 is designed, the radius R1 of the concave bending portion and the radius R2 of the convex bending portion in the concave-convex bending shape 4 are the same as the original shape. For example, as shown in FIG. 5B, different values, that is, R1>R2 are set. When press forming analysis and springback analysis were performed on the press-formed product 1 having this original shape by using known software on a computer, as shown by a displacement contour line in FIG. It can be seen that the negative Z-direction displacement on the left side of shape 3 is large, and that it has dropped significantly, and from the additional shape 2 on the upper-left direction, the negative Z-direction displacement is even greater. It can be seen that the press-formed product 1 is twisted.

そこで、この実施形態のプレス成形品の設計方法では、付加形状２，３の各々の周縁部の、凹曲げ部と凸曲げ部とが連続した略Ｓ字状断面の凹凸曲げ形状４における凹曲げ部の半径Ｒ１と凸曲げ部の半径Ｒ２とを、例えば図５（ａ）に示すように、互いに同一の値すなわちＲ１＝Ｒ２に設定して、上記実施形態のプレス成形品１を設計した。  Therefore, in the method for designing a press-formed product according to this embodiment, the concave bending in the concave-convex bent shape 4 of the substantially S-shaped cross section in which the concave bent portion and the convex bent portion are continuous is formed in the peripheral edge portion of each of the additional shapes 2 and 3. The radius R1 of the portion and the radius R2 of the convex bent portion are set to the same value, that is, R1=R2, for example, as shown in FIG. 5A, and the press-formed product 1 of the above embodiment is designed.

凹曲げ部の半径Ｒ１と凸曲げ部の半径Ｒ２とを同一の値にしたこの実施形態のプレス成形品１について、元の形状と同様にコンピュータで既知のソフトウェアを用いてプレス成形解析およびスプリングバック解析を実施したところ、図４に符号Ｏの点を基準高さとする変位等高線で示すように、付加形状３より左側で、負側のＺ方向変位が低減していることから元の形状よりも落ち込みが小さくなっていることが判り、また付加形状２から左上方向で、負側のＺ方向変位が低減していることから元の形状よりもプレス成形品１のねじれも低減していることが判る。従って、この実施形態の設計方法およびこの実施形態のプレス成形品１によれば、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。  For the press-formed product 1 of this embodiment in which the radius R1 of the concave bent portion and the radius R2 of the convex bent portion have the same value, press-forming analysis and springback are performed using software known to the computer as in the original shape. As a result of the analysis, as shown in FIG. 4 by a displacement contour line having a reference height of O as a reference height, the Z-direction displacement on the negative side on the left side of the additional shape 3 is reduced, so that it is smaller than the original shape. It can be seen that the drop is small, and the negative Z-direction displacement in the upper left direction from the additional shape 2 is reduced, so that the twist of the press-formed product 1 is also reduced compared to the original shape. I understand. Therefore, according to the designing method of this embodiment and the press-formed product 1 of this embodiment, it is possible to prevent the press-formed product from falling or bouncing up and twisting of the press-formed product, and to suppress the press-formed product by springback. Defects in shape can be suppressed.

この実施形態のプレス成形品１を形成する板状材料は、例えば９８０ＭＰａ級高張力鋼板、板厚ｔ：０．９ｍｍ、降伏点ＹＰ：６２０ＭＰａ、引張り強さＴＳ：１０３０ＭＰａ、伸びＥｌ：１５％とすることができ、本発明の一実施形態のプレス成形品の製造方法は、本発明の一実施形態のプレス成形金型を用いてこの鋼板をプレス成形して、上記実施形態のプレス成形品１を形成する。  The plate-shaped material forming the press-formed product 1 of this embodiment is, for example, a 980 MPa class high-tensile steel plate, plate thickness t: 0.9 mm, yield point YP: 620 MPa, tensile strength TS: 1030 MPa, and elongation El: 15%. The method for manufacturing a press-formed product according to one embodiment of the present invention is the press-formed product 1 according to the above-described embodiment, in which the steel sheet is press-formed using the press-forming die according to one embodiment of the present invention. To form.

このため上記実施形態のプレス成形金型は、金型部材として、通常のパンチとダイとブランクホルダーとを具えており、ダイは、プレス成形品１の図１では上下端部に位置する外向きフランジから上の薄い台状形状およびその台状形状の平坦面から突出した付加形状２，３に対応する形状の凹部を持ち、ブランクホルダーは、そのダイの凹部の外側の平面との間で鋼板を挟持し、パンチは、それらダイとブランクホルダーとで挟持した鋼板をダイの凹部に押し込んで薄い台状形状に成形するとともに、パンチ先端の凸部をダイの凹部に押し込んでその台状形状の平坦面に付加形状２，３を押し出し成形する。  For this reason, the press-molding die of the above-described embodiment includes a normal punch, a die, and a blank holder as die members, and the die is positioned outwardly of the press-molded article 1 at the upper and lower ends in FIG. The blank holder has a recess having a thin trapezoidal shape above the flange and a shape corresponding to the additional shapes 2 and 3 protruding from the flat surface of the trapezoidal shape. The punch presses the steel plate sandwiched between the die and the blank holder into the recess of the die to form a thin trapezoidal shape, and the projection of the punch tip into the recess of the die to form the trapezoidal shape. The additional shapes 2 and 3 are extruded on a flat surface.

ここで、上記実施形態のプレス成形金型におけるダイの凹部の、付加形状２，３の凹曲げ部を成形する肩部の断面形状の半径は、実質的に凹曲げ部の半径Ｒ１に等しくされ、またパンチ先端の凸部の、付加形状２，３の凸曲げ部を成形する肩部の断面形状の半径は、実質的に凸曲げ部の半径Ｒ２に等しくされ、そしてそれらの肩部の断面形状の半径は、互いに等しくされている。  Here, the radius of the cross-sectional shape of the shoulder of the concave portion of the die in the press-molding die of the above-described embodiment that forms the concave bent portion of the additional shapes 2 and 3 is substantially equal to the radius R1 of the concave bent portion. Also, the radius of the cross-sectional shape of the convex portion of the punch tip, which forms the convex bending portion of the additional shapes 2 and 3, is substantially equal to the radius R2 of the convex bending portion, and the cross section of those shoulder portions. The radii of the shapes are equal to each other.

上記実施形態のプレス成形品の製造方法により、上記実施形態のプレス成形金型を用いてプレス成形されるプレス成形品１は、付加形状２，３における凹曲げ部の半径Ｒ１と凸曲げ部の半径Ｒ２とが同一である上記実施形態のプレス成形品となり、この実施形態のプレス成形品およびその製造方法によれば、そのプレス成形品のスプリングバックに起因するプレス成形品端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。  The press-molded product 1 press-molded using the press-molding die of the above-mentioned embodiment by the method for manufacturing a press-molded product of the above-described embodiment has a radius R1 of the concave bending portion and a convex bending portion of the additional shapes 2 and 3. The press-formed product according to the above-described embodiment has the same radius R2, and according to the press-formed product and the method for manufacturing the same according to this embodiment, the press-formed product ends or falls due to springback of the press-formed product. And the twist of the press-formed product can be suppressed, and the defective shape of the press-formed product due to springback can be suppressed.

以上、実施形態について説明したが、本発明のプレス成形品の設計方法、プレス成形金型、プレス成形品およびプレス成形品の製造方法は、上記実施形態に限定されるものでなく、特許請求の範囲の記載範囲内で適宜変更し得るものであり、例えば、プレス成形品の形状や付加形状は、図１に示すもの以外でもよく、また凹曲げ部と凸曲げ部とが連続した略Ｓ字状断面の凹凸曲げ形状は、剛性向上のための付加形状のものに限られず、曲げモーメントの低減や材料流量コントロール等のための付加形状のものでもよい。  Although the embodiment has been described above, the method for designing a press-molded product, the press-molding die, the press-molded product and the method for manufacturing the press-molded product according to the present invention are not limited to the above-described embodiment, The shape and the additional shape of the press-formed product may be those other than those shown in FIG. 1, and the shape and the additional shape of the press-formed product may be substantially S-shaped in which the concave bent portion and the convex bent portion are continuous. The concavo-convex bent shape of the cross section is not limited to the additional shape for improving the rigidity, but may be the additional shape for reducing the bending moment, controlling the material flow rate, or the like.

かくして本発明のプレス成形品の設計方法、プレス成形金型、プレス成形品およびプレス成形品の製造方法によれば、スプリングバックに起因するプレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。  Thus, according to the method for designing a press-formed product, the press-molding die, the press-formed product and the method for producing a press-formed product of the present invention, the end of the press-formed product due to the spring back is dropped or jumped up or the press-formed product is Twist can be suppressed, and the defective shape of the press-formed product due to springback can be suppressed.

１ プレス成形品
２，３ 付加形状
４ 凹凸曲げ形状
Ｒ１ 凹曲げ部の半径
Ｒ２ 凸曲げ部の半径1 Press-formed product 2, 3 Additional shape 4 Uneven bending shape R1 Radius of concave bending portion R2 Radius of convex bending portion

本発明のプレス成形品の設計方法は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、
板状材料からプレス成形されるプレス成形品の形状を設計するに際し、
前記プレス成形品の平坦面に、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を配置し、
前記付加形状が有する、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状における、凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることを特徴としている。 The design method of the press-formed product of the present invention is
In order to suppress the defective shape of the press-molded product due to springback when releasing the press-molded product,
When designing the shape of a press-formed product that is press-formed from a plate-shaped material,
On the flat surface of the press-formed product , an additional shape having an uneven bending shape in which a concave bending portion and a convex bending portion are continuous is arranged ,
In the concavo-convex bent shape in which the concave bent portion and the convex bent portion are continuous, which is included in the additional shape, the curvature radius of the concave bending portion and the curvature radius of the convex bending portion are the same.

また、上記設計方法を用いた本発明のプレス成形金型は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、
凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を平坦面に配置したプレス成形品を板状材料からプレス成形するプレス成形金型であって、
前記プレス成形品の平坦面に配置した付加形状が有する凹凸曲げ形状における凹曲げ部と凸曲げ部とをそれぞれ成形する肩部を有する金型部材を具え、
それらの金型部材の肩部の曲率半径が同一であることを特徴としている。 Further, the press mold of the present invention using the above design method,
In order to suppress the defective shape of the press-molded product due to springback when releasing the press-molded product,
A press-molding die for press-molding from a plate-shaped material a press-molded product in which an additional shape having a concavo-convex bent shape in which concave and convex bent portions are continuous is arranged,
Comprising a mold member having a shoulder for forming respectively a concave bending portion and the convex bent portion of the concave convex bent shape having additional shape disposed on the flat surface of the press-molded product,
The mold members are characterized in that the shoulders have the same radius of curvature.

そして、上記設計方法を用いた本発明のプレス成形品は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、
板状材料からプレス成形されるとともに、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状が平坦面に配置されたプレス成形品であって、
その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径が同一であることを特徴としている。 Then, the press-formed product of the present invention using the above design method,
In order to suppress the defective shape of the press-molded product due to springback when releasing the press-molded product,
A press-formed product in which an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are arranged is arranged on a flat surface while being pressed from a plate-shaped material,
It is characterized in that the radius of curvature of the concave bent portion and the radius of curvature of the convex bent portion in the concavo-convex bent shape are the same.

さらに、本発明のプレス成形品の製造方法は、
プレス成形品の離型時のスプリングバックによるプレス成形品の形状不良を抑制するために、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を平坦面に配置したプレス成形品を板状材料からプレス成形によって製造するに際し、
その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることを特徴としている。
なお、この明細書において「同一」とは、一方の曲率半径に対して他方の曲率半径が、好ましくは±１０％の範囲内にあればよく、より好ましくは±５％の範囲内にあればよい。 Furthermore, the method for producing a press-formed product of the present invention,
In order to suppress the defective shape of the press-formed product due to springback when the press-formed product is released from the press-formed product, a press-formed product in which an additional shape having a concavo-convex bent shape in which concave and convex bent portions are continuous is arranged on a flat surface. When manufacturing from a plate-shaped material by press molding,
It is characterized in that the radius of curvature of the concave bent portion and the radius of curvature of the convex bent portion in the uneven bent shape are the same.
In this specification, "same" means that the radius of curvature of one is preferably within ±10% with respect to the radius of curvature of one, and more preferably within ±5%. Good.

本発明のプレス成形品の設計方法によれば、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状をプレス成形品の平坦面に配置するとともに、その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることから、プレス成形品の凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後にそのスプリングバック量にかかわらず互いに平行になるため、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。 According to the method for designing a press-formed product of the present invention, an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are continuous is arranged on the flat surface of the press-formed product, and the concave bending in the concave-convex bent shape is performed. Since the radius of curvature of the part and the radius of curvature of the convex bent part are the same, the flat parts on both sides of the concave-convex bent shape of the press-formed product become parallel to each other after springback regardless of the springback amount. It is possible to suppress the falling or jumping up of the end of the molded product and the twist of the press molded product, and it is possible to suppress the defective shape of the press molded product due to springback.

また本発明のプレス成形金型によれば、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を平坦面に配置したプレス成形品を板状材料からプレス成形するプレス成形金型の、凹凸曲げ形状における凹曲げ部と凸曲げ部とをそれぞれ成形する肩部を有する金型部材の、それらの肩部の断面の曲率半径が同一であることから、プレス成形品の、それらの肩部で凹曲げ部と凸曲げ部とを形成される凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後にそのスプリングバック量にかかわらず互いに平行になるため、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。 Further, according to the press-molding die of the present invention, a press-molding metal for press-molding a plate-shaped material into a press-molded product in which an additional shape having a concavo-convex bent shape in which concave and convex portions are continuous is arranged on a flat surface. Since the die members having shoulder portions for respectively forming the concave and convex portions in the concave-convex bent shape of the mold have the same radius of curvature of the cross section of those shoulder portions, those of the press-formed product Since the flat parts on both sides sandwiching the concave-convex bent shape in which the concave and convex parts are formed by the shoulder part of the shoulder are parallel to each other after the springback regardless of the springback amount, It is possible to suppress a drop or jump and a twist of the press-formed product, and it is possible to suppress a defective shape of the press-formed product due to springback.

そして本発明のプレス成形品およびプレス成形品の製造方法によれば、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状が平坦面に配置され、その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径が同一であることから、プレス成形品の凹凸曲げ形状を挟んだ両側の平坦部がスプリングバック後にそのスプリングバック量にかかわらず互いに平行になるため、プレス成形品の端部の落ち込みまたは跳ね上がりやプレス成形品のねじれを抑制し得て、スプリングバックによるプレス成形品の形状不良を抑制することができる。 Further, according to the press-formed product and the method for manufacturing the press-formed product of the present invention, the additional shape having the concave and convex bent shape in which the concave bent portion and the convex bent portion are continuous is arranged on the flat surface, and the concave bent in the concave and convex bent shape is formed. Since the radius of curvature of the part and the radius of curvature of the convex bent part are the same, the flat parts on both sides of the concavo-convex bent shape of the press-formed product become parallel to each other after springback regardless of the springback amount. It is possible to suppress the falling or jumping up of the end of the molded product and the twist of the press molded product, and it is possible to suppress the defective shape of the press molded product due to springback.

Claims (8)

板状材料からプレス成形されるプレス成形品の形状を設計するに際し、
前記プレス成形品に配置した付加形状が有する、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状における、凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることを特徴とするプレス成形品の設計方法。When designing the shape of a press-formed product that is press-formed from a plate-shaped material,
The curvature radius of the concave bending portion and the curvature radius of the convex bending portion are the same in the concave and convex bending shape in which the concave bending portion and the convex bending portion are continuous, which the additional shape arranged in the press-formed product has. Design method of press-formed products. 前記付加形状は、前記プレス成形品の剛性向上のために付加されるものであることを特徴とする、請求項１記載のプレス成形品の設計方法。  The method for designing a press-formed product according to claim 1, wherein the additional shape is added to improve the rigidity of the press-formed product. 凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を配置したプレス成形品を板状材料からプレス成形するプレス成形金型において、
前記プレス成形品に配置した付加形状が有する凸曲げ形状における凹曲げ部と凸曲げ部とをそれぞれ成形する肩部を有する金型部材を具え、
それらの金型部材の肩部の曲率半径が同一であることを特徴とするプレス成形金型。In a press-molding die for press-molding a press-formed product in which an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are arranged is press-formed from a plate-shaped material,
A mold member having a shoulder portion for forming each of the concave bending portion and the convex bending portion in the convex bending shape having the additional shape arranged in the press-formed product,
A press-molding die, wherein the shoulders of the die members have the same radius of curvature. 前記付加形状は、前記プレス成形品の剛性向上のために付加されるものであることを特徴とする、請求項３記載のプレス成形金型。  The press-molding die according to claim 3, wherein the additional shape is added to improve the rigidity of the press-molded product. 板状材料からプレス成形されるとともに、凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状が配置されたプレス成形品において、
前記凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径が同一であることを特徴とするプレス成形品。In a press-formed product in which an additional shape having a concavo-convex bent shape in which a concave bent portion and a convex bent portion are arranged is arranged while being press-formed from a plate-shaped material,
The press-formed product, wherein the concave and convex bent portions have the same radius of curvature as that of the convex and bent portions. 前記付加形状は、前記プレス成形品の剛性向上のために付加されるものであることを特徴とする、請求項５記載のプレス成形品。  The press-formed product according to claim 5, wherein the additional shape is added to improve the rigidity of the press-formed product. 凹曲げ部と凸曲げ部とが連続した凹凸曲げ形状を有する付加形状を配置したプレス成形品を板状材料からプレス成形によって製造するに際し、
その凹凸曲げ形状における凹曲げ部の曲率半径と凸曲げ部の曲率半径を同一にすることを特徴とするプレス成形品の製造方法。In producing a press-formed product in which an additional shape having a concavo-convex bent shape in which concave and convex portions are continuous is manufactured by press molding from a plate-shaped material,
A method for manufacturing a press-formed product, characterized in that the radius of curvature of a concave bent portion and the radius of curvature of a convex bent portion in the uneven bent shape are the same. 前記付加形状は、前記プレス成形品の剛性向上のために付加することを特徴とする、請求項７記載のプレス成形品の製造方法。  The method for manufacturing a press-formed product according to claim 7, wherein the additional shape is added to improve the rigidity of the press-formed product.
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Families Citing this family (2)

* Cited by examiner, † Cited by third party
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07112219A (en) * 1993-10-15 1995-05-02 Toyota Motor Corp Object to be worked, having flange with curvature, and its forming die
JPH07185663A (en) * 1993-12-28 1995-07-25 Honda Motor Co Ltd Press forming method and press formed article
JPH08281335A (en) * 1995-04-06 1996-10-29 Nippon Steel Corp Metal sheet for press forming excellent in shape freezability and its forming method
JP2004337980A (en) * 2003-04-22 2004-12-02 Toyota Motor Corp Channel part and method for deciding shape of the step
JP2008105088A (en) * 2006-10-27 2008-05-08 Toyo Seikan Kaisha Ltd Square drawn container and method for forming the same
WO2010038539A1 (en) * 2008-09-30 2010-04-08 新日本製鐵株式会社 Molding simulation method, molding simulation device, program, recording medium, and molding method based on simulation result
JP5380890B2 (en) * 2008-04-15 2014-01-08 新日鐵住金株式会社 Press molding method and apparatus excellent in shape freezing property

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006272413A (en) * 2005-03-30 2006-10-12 Kobe Steel Ltd Shaping method of curved channel member
JP4724626B2 (en) * 2006-08-31 2011-07-13 新日本製鐵株式会社 Springback occurrence cause identifying method, apparatus thereof, and program thereof
TW200824813A (en) * 2006-08-31 2008-06-16 Nippon Steel Corp Springback occurrence cause identifying method, springback influence degree display method, springback occurrence cause portion identifying method, springback measure position specifying method, their devices, and their programs
DE102007053537A1 (en) * 2007-04-26 2008-10-30 Hyundai Motor Co. Bead forming unit for a press
JP5798432B2 (en) * 2011-10-03 2015-10-21 近畿車輌株式会社 Railcar body skin
JP5887554B2 (en) * 2012-02-29 2016-03-16 パナソニックＩｐマネジメント株式会社 Light emitting device and lighting apparatus
CN102744298B (en) * 2012-07-24 2015-08-26 三江瓦力特特种车辆有限公司 A kind of bending method of part
TWI628013B (en) * 2015-05-11 2018-07-01 新日鐵住金股份有限公司 Press forming apparatus and press forming method
JP6659380B2 (en) * 2016-01-29 2020-03-04 株式会社神戸製鋼所 Method for manufacturing press-formed product and press-forming apparatus
CN105855342A (en) * 2016-03-31 2016-08-17 胜狮货柜管理(上海)有限公司 Profiling equipment and profiling technique and method for production of container side plate

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07112219A (en) * 1993-10-15 1995-05-02 Toyota Motor Corp Object to be worked, having flange with curvature, and its forming die
JPH07185663A (en) * 1993-12-28 1995-07-25 Honda Motor Co Ltd Press forming method and press formed article
JPH08281335A (en) * 1995-04-06 1996-10-29 Nippon Steel Corp Metal sheet for press forming excellent in shape freezability and its forming method
JP2004337980A (en) * 2003-04-22 2004-12-02 Toyota Motor Corp Channel part and method for deciding shape of the step
JP2008105088A (en) * 2006-10-27 2008-05-08 Toyo Seikan Kaisha Ltd Square drawn container and method for forming the same
JP5380890B2 (en) * 2008-04-15 2014-01-08 新日鐵住金株式会社 Press molding method and apparatus excellent in shape freezing property
WO2010038539A1 (en) * 2008-09-30 2010-04-08 新日本製鐵株式会社 Molding simulation method, molding simulation device, program, recording medium, and molding method based on simulation result

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EP3778053A1 (en) 2021-02-17
KR102370794B1 (en) 2022-03-04
CN111801175A (en) 2020-10-20
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JP6738055B2 (en) 2020-08-12
MX2020010016A (en) 2020-10-14

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