JP6897841B1 - Press molded product - Google Patents

Press molded product Download PDF

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JP6897841B1
JP6897841B1 JP2020070144A JP2020070144A JP6897841B1 JP 6897841 B1 JP6897841 B1 JP 6897841B1 JP 2020070144 A JP2020070144 A JP 2020070144A JP 2020070144 A JP2020070144 A JP 2020070144A JP 6897841 B1 JP6897841 B1 JP 6897841B1
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press
curved
molded product
bending radius
flange
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JP2021166998A (en
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祐輔 藤井
祐輔 藤井
正樹 卜部
正樹 卜部
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JFE Steel Corp
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JFE Steel Corp
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Priority to JP2020070144A priority Critical patent/JP6897841B1/en
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to US17/914,990 priority patent/US20230150002A1/en
Priority to EP20930002.9A priority patent/EP4134184A4/en
Priority to CN202080099142.1A priority patent/CN115397577A/en
Priority to MX2022012137A priority patent/MX2022012137A/en
Priority to PCT/JP2020/044608 priority patent/WO2021205692A1/en
Priority to KR1020227034048A priority patent/KR20220146631A/en
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Abstract

【課題】上面視で凹状に湾曲し、フランジ部における割れが抑制され、かつ天板部及び縦壁部におけるしわが抑制されたプレス成形品を提供する。【解決手段】本発明に係るプレス成形品1は、天板部3と、天板部3からパンチ肩部5を介して連続する縦壁部7と、縦壁部7からダイ肩部9を介して連続するフランジ部11とを有し、上面視で凹状に湾曲した湾曲部位13を備えたものであって、湾曲部位13におけるパンチ肩部5の曲げ半径が、湾曲の中央部から端部側に向かって大きくなっていることを特徴とするものである。【選択図】 図1PROBLEM TO BE SOLVED: To provide a press-molded product which is curved in a concave shape in a top view, cracks in a flange portion are suppressed, and wrinkles in a top plate portion and a vertical wall portion are suppressed. SOLUTION: A press-molded product 1 according to the present invention has a top plate portion 3, a vertical wall portion 7 continuous from the top plate portion 3 via a punch shoulder portion 5, and a vertical wall portion 7 to a die shoulder portion 9. It has a flange portion 11 that is continuous through the flange portion 11 and is provided with a curved portion 13 that is concavely curved in a top view, and the bending radius of the punch shoulder portion 5 at the curved portion 13 is from the center portion to the end portion of the curvature. It is characterized by increasing toward the side. [Selection diagram] Fig. 1

Description

本発明は、プレス成形品に関し、特に、天板部と、該天板部からパンチ肩部を介して連続する縦壁部と、該縦壁部からダイ肩部を介して連続するフランジ部とを有し、上面視で凹状に湾曲した湾曲部位を備えたプレス成形品に関する。 The present invention relates to a press-molded product, and in particular, a top plate portion, a vertical wall portion continuous from the top plate portion via a punch shoulder portion, and a flange portion continuous from the vertical wall portion via a die shoulder portion. The present invention relates to a press-molded product having a curved portion curved in a concave shape in a top view.

金属板のプレス成形品は、低コストかつ短時間に製造することができる金属部品であり、多くの自動車部品に用いられている。近年では、自動車の衝突安全性の向上と車体の軽量化を両立するため、より高強度な金属板が自動車部品に利用されている。しかしながら、高強度な金属板を用いたプレス成形品は、そのプレス成形過程において、延性の低下による割れの発生と、降伏強度の上昇によるしわの発生、といった課題がある。 Press-molded products of metal plates are metal parts that can be manufactured at low cost and in a short time, and are used in many automobile parts. In recent years, higher-strength metal plates have been used for automobile parts in order to improve the collision safety of automobiles and reduce the weight of the vehicle body. However, a press-molded product using a high-strength metal plate has problems such as cracks due to a decrease in ductility and wrinkles due to an increase in yield strength in the press-molding process.

例えば、図9に一例として示すような上面視で縦壁部107が凹状に湾曲したプレス成形品101は、プレス成形過程において湾曲部位113におけるフランジ部111が円周方向に引っ張られることで、割れが発生しやすい。また、その反力として円周方向に縮む変形が湾曲部位113における天板部103やパンチ肩部105で起こることで、しわが発生しやすい。この変形を伸びフランジ変形という。したがって、プレス成形品101においては、この伸びフランジ変形過程での割れとしわの発生を抑制することが重要となる。 For example, the press-molded product 101 in which the vertical wall portion 107 is concavely curved in a top view as shown as an example in FIG. 9 is cracked by pulling the flange portion 111 in the curved portion 113 in the circumferential direction during the press molding process. Is likely to occur. Further, as the reaction force, deformation that contracts in the circumferential direction occurs at the top plate portion 103 and the punch shoulder portion 105 at the curved portion 113, so that wrinkles are likely to occur. This deformation is called stretch flange deformation. Therefore, in the press-molded product 101, it is important to suppress the occurrence of cracks and wrinkles in the process of deforming the stretched flange.

これまでに、上面視で凹状に湾曲したプレス成形品の割れとしわを抑制する技術がいくつか提案されている。
例えば、特許文献1には、天板部と、弧状に湾曲している部位を有する屈曲部を介して、前記天板部につながり、且つ、前記屈曲部と反対側にフランジ部を有する縦壁部とを有するL字状形状部品を素材金属板からプレス成形する技術が開示されている。そして、特許文献1によれば、前記素材金属板の前記天板部に相当する部位をパッドにより加圧した状態とし、且つ、前記素材金属板のうち、L字状形状部品のL字下側部に相当する部位の端部がスライド(面内移動)することを許容した状態とし、L字下側部に相当する部位が前記縦壁部側に引き込まれて前記縦壁部とフランジ部とを成形することで、前記フランジ部における割れの発生と前記天板部におけるシワの発生を抑制したL字状形状部品が得られるとされている。
So far, some techniques for suppressing cracks and wrinkles in a press-molded product that is concavely curved in a top view have been proposed.
For example, Patent Document 1 describes a vertical wall that is connected to the top plate portion via a top plate portion and a bent portion having a curved portion in an arc shape and has a flange portion on the opposite side of the bent portion. A technique for press-molding an L-shaped part having a portion from a material metal plate is disclosed. Then, according to Patent Document 1, a portion of the material metal plate corresponding to the top plate portion is pressed by a pad, and the L-shaped lower side of the L-shaped part of the material metal plate is in a state of being pressed. The end of the portion corresponding to the portion is allowed to slide (in-plane movement), and the portion corresponding to the lower L-shaped portion is pulled toward the vertical wall portion to form the vertical wall portion and the flange portion. It is said that an L-shaped part that suppresses the occurrence of cracks in the flange portion and the occurrence of wrinkles in the top plate portion can be obtained by molding.

また、特許文献2には、ハット形またはコの字形の断面形状を有するとともに、長手方向に沿って湾曲した湾曲部とその湾曲部の両端に繋がる直辺部とを有する部品をプレス成形する技術が開示されている。そして、特許文献2によれば、湾曲部のフランジ部に発生する周方向の引張変形を緩和させる材料移動を生じさせることで、伸びフランジ変形による割れの発生を抑制した部品が得られるとされている。 Further, Patent Document 2 describes a technique for press-molding a part having a hat-shaped or U-shaped cross-sectional shape and having a curved portion curved in the longitudinal direction and a straight side portion connected to both ends of the curved portion. Is disclosed. Then, according to Patent Document 2, it is said that a component that suppresses the occurrence of cracks due to the elongation flange deformation can be obtained by causing a material movement that alleviates the tensile deformation in the circumferential direction that occurs in the flange portion of the curved portion. There is.

特許第5168429号公報Japanese Patent No. 5168429 特許第6028956号公報Japanese Patent No. 6028956

特許文献1に開示されている技術においては、図10に示すように、天板部103からフランジ部111側に流出するブランク(金属板)の材料の移動方向は、伸びフランジ変形によって材料が引っ張られる方向(周方向の点線矢印)とは一致しない。そして、このようなブランクの材料移動を図11に示すように2方向のベクトルに分解すると、湾曲部位113の端部側から中央部に向かう材料移動(図中の黒塗り実線矢印)は、伸びフランジ変形によるフランジ部111の割れを抑制するのに有効であるが、天板部103から縦壁部107に向かう材料移動(図中の黒塗り破線矢印)は伸びフランジ変形による割れの抑制には寄与しない。
さらに、湾曲部位113の中央部に向かう材料移動であっても湾曲部位113の中央部付近の材料移動(図中の白塗り矢印)は天板部103やパンチ肩部105付近におけるしわを誘発する懸念がある。
In the technique disclosed in Patent Document 1, as shown in FIG. 10, the moving direction of the blank (metal plate) material flowing out from the top plate portion 103 to the flange portion 111 side is such that the material is pulled by the elongation flange deformation. It does not match the direction (dotted arrow in the circumferential direction). Then, when the material movement of the blank is decomposed into vectors in two directions as shown in FIG. 11, the material movement from the end side to the center of the curved portion 113 (black solid line arrow in the figure) is elongated. It is effective in suppressing cracks in the flange portion 111 due to flange deformation, but material movement from the top plate portion 103 to the vertical wall portion 107 (black arrow in the figure) is effective in suppressing cracks due to stretch flange deformation. Does not contribute.
Further, even if the material moves toward the central portion of the curved portion 113, the material movement near the central portion of the curved portion 113 (white arrow in the figure) induces wrinkles in the vicinity of the top plate portion 103 and the punch shoulder portion 105. There are concerns.

また、特許文献1に開示されている技術は、素材金属板における天板部に相当する部位がパッドで加圧されることで天板部のしわが抑制されるものであるが、高強度の鋼板ほどしわを加圧するパッド荷重の増大を要するため、金型内に設置するガスシリンダーなどの圧力発生装置が巨大化する懸念がある。その結果、金型内にパッドを設置するスペースが確保できない場合があるといった問題や、金型の大型化によるコスト増大の問題がある。
また、図9に示すプレス成形品101のプレス成形に特許文献1の技術を適用した場合、パンチ肩部105をパッドで加圧することができないため、パンチ肩部105におけるしわを抑制することができない。
Further, the technique disclosed in Patent Document 1 suppresses wrinkles in the top plate portion by pressing a portion of the material metal plate corresponding to the top plate portion with a pad, but has high strength. Since it is necessary to increase the pad load that pressurizes wrinkles as much as a steel plate, there is a concern that the pressure generator such as a gas cylinder installed in the mold will become huge. As a result, there is a problem that the space for installing the pad in the mold may not be secured, and there is a problem that the cost increases due to the increase in size of the mold.
Further, when the technique of Patent Document 1 is applied to the press molding of the press-molded product 101 shown in FIG. 9, the punch shoulder 105 cannot be pressed by the pad, so that the wrinkles on the punch shoulder 105 cannot be suppressed. ..

さらに、特許文献1及び特許文献2は、例えば、湾曲部位113またはその近傍における天板部103にビード形状を付与する必要があるプレス成形品では、図11に示す天板部103に相当する部位の材料を伸びフランジ変形が起こるフランジ部111へ移動させることができないような場合があり、しわの抑制ができない。 Further, in Patent Document 1 and Patent Document 2, for example, in a press-molded product in which it is necessary to impart a bead shape to the top plate portion 103 at or near the curved portion 113, the portion corresponding to the top plate portion 103 shown in FIG. In some cases, it may not be possible to move the material of No. 1 to the flange portion 111 where the stretched flange deforms, and wrinkles cannot be suppressed.

本発明は、上記のような課題を解決するためになされたものであり、天板部、縦壁部及びフランジ部を有して上面視で凹状に湾曲し、伸びフランジ変形が生じるフランジ部での割れを抑制し、該フランジ部側の天板部やパンチ肩部のしわを抑制したプレス成形品を提案することを目的とする。 The present invention has been made to solve the above-mentioned problems, and is a flange portion having a top plate portion, a vertical wall portion, and a flange portion, which is curved in a concave shape in a top view and causes elongation flange deformation. It is an object of the present invention to propose a press-molded product in which cracks are suppressed and wrinkles on the top plate portion and punch shoulder portion on the flange portion side are suppressed.

(1)本発明に係るプレス成形品は、天板部と、該天板部からパンチ肩部を介して連続する縦壁部と、該縦壁部からダイ肩部を介して連続するフランジ部とを有し、上面視で凹状に湾曲した湾曲部位を備えたものであって、
前記湾曲部位における前記パンチ肩部の曲げ半径が、湾曲の中央部から端部側に向かって大きくなっていることを特徴とするものである。
(1) The press-molded product according to the present invention has a top plate portion, a vertical wall portion continuous from the top plate portion via a punch shoulder portion, and a flange portion continuous from the vertical wall portion via a die shoulder portion. It has a curved portion that is curved in a concave shape when viewed from above.
It is characterized in that the bending radius of the punch shoulder portion at the curved portion increases from the central portion of the curved portion toward the end portion side.

(2)上記(1)に記載のものにおいて、
前記湾曲部位における前記ダイ肩部の曲げ半径が、湾曲の中央部から端部側に向かって小さくなっていることを特徴とするものである。
(2) In the item described in (1) above,
It is characterized in that the bending radius of the die shoulder portion at the curved portion decreases from the central portion of the curved portion toward the end portion side.

(3)上記(1)又は(2)に記載のものにおいて、
前記ダイ肩部の最小曲げ半径が、前記パンチ肩部の最小曲げ半径より小さいことを特徴とするものである。
(3) In the above-mentioned (1) or (2),
The minimum bending radius of the die shoulder portion is smaller than the minimum bending radius of the punch shoulder portion.

(4)上記(1)乃至(3)のいずれかに記載のものにおいて、
プレス成形過程においてブランクの回転運動を拘束する回転運動拘束形状部が前記湾曲の端部側における前記天板部に形成されていることを特徴とするものである。
(4) In any of the above (1) to (3),
It is characterized in that a rotary motion restraint shape portion that restrains the rotary motion of the blank in the press molding process is formed on the top plate portion on the end side of the curve.

(5)上記(1)乃至(4)のいずれかに記載のものにおいて、
前記湾曲部位における前記フランジ部の幅が、湾曲の端部側に比べて中央部の方が広いことを特徴とするものである。
(5) In any of the above (1) to (4),
The width of the flange portion at the curved portion is wider at the central portion than at the end side of the curved portion.

(6)上記(1)乃至(5)のいずれかに記載のものにおいて、
引張強度が440MPa級〜1600MPa級の金属板を用いてプレス成形されたことを特徴とするものである。
(6) In any of the above (1) to (5),
It is characterized by being press-molded using a metal plate having a tensile strength of 440 MPa class to 1600 MPa class.

本発明においては、天板部と、該天板部からパンチ肩部を介して連続する縦壁部と、該縦壁部からダイ肩部を介して連続するフランジ部とを有し、上面視で凹状に湾曲した湾曲部位を備え、前記湾曲部位におけるパンチ肩部の曲げ半径が、湾曲の中央部から端部側に向かって大きいことにより、プレス成形過程において湾曲の端部側の前記天板部から湾曲の中央部の前記フランジ部に向かって材料を移動させることができるので、前記湾曲部位の前記フランジ部における割れが抑制されるとともに、前記湾曲部位における前記フランジ部側の前記天板部や前記パンチ肩部のしわが抑制される。 In the present invention, it has a top plate portion, a vertical wall portion continuous from the top plate portion via a punch shoulder portion, and a flange portion continuous from the vertical wall portion via a die shoulder portion, and is viewed from above. The top plate on the curved end side in the press molding process is provided with a curved portion that is curved in a concave shape, and the bending radius of the punch shoulder portion at the curved portion is large from the central portion to the end side of the curvature. Since the material can be moved from the portion toward the flange portion in the central portion of the curve, cracking in the flange portion of the curved portion is suppressed, and the top plate portion on the flange portion side in the curved portion is suppressed. And wrinkles on the punch shoulder are suppressed.

本発明の実施の形態に係るプレス成形品の一例を示す図である((a)斜視図、(b)上面図)。It is a figure which shows an example of the press-molded article which concerns on embodiment of this invention ((a) perspective view, (b) top view). 本発明の実施の形態に係るプレス成形品のプレス成形過程において割れとしわが抑制される理由を説明する図である((a)上面図、(b)湾曲の端部側の断面図、(c)湾曲の中央部の断面図)。It is a figure explaining the reason why crack and wrinkle are suppressed in the press molding process of the press-molded article which concerns on embodiment of this invention ((a) top view, (b) cross-sectional view of the curved end side, (c). ) Cross section of the central part of the curve). 本発明の実施の形態の他の態様に係るプレス成形品の一例を示す図である((a)斜視図、(b)上面図)。It is a figure which shows an example of the press-molded article which concerns on other aspects of the Embodiment of this invention ((a) perspective view, (b) top view). 本発明の実施の形態の他の態様に係るプレス成形品のプレス成形過程において割れとしわが抑制される理由を説明する図である((a)上面図、(b)湾曲の端部側の断面図、(c)湾曲の中央部の断面図)。It is a figure explaining the reason why crack and wrinkle are suppressed in the press molding process of the press-molded article which concerns on another aspect of embodiment of this invention ((a) top view, (b) cross section on the end side of a curve. FIG. (C) Cross-sectional view of the central portion of the curve). 本発明の実施の形態に係るプレス成形品であって、プレス成形過程においてブランク端部に成形された縦壁部により、天板部に平行な水平面内でのブランクの回転運動を拘束する形状が形成されたプレス成形品の一例を示す図である。A press-molded product according to an embodiment of the present invention, which has a shape that restrains the rotational movement of the blank in a horizontal plane parallel to the top plate portion by a vertical wall portion formed at the blank end portion in the press molding process. It is a figure which shows an example of the formed press-molded article. 本発明の実施の形態に係るプレス成形品であって、プレス成形過程において、ビードにより、天板部に平行な水平面内でのブランクの回転運動を拘束する形状が形成されたプレス成形品の他の例を示す図である。Other than the press-molded product according to the embodiment of the present invention, in which a shape that restrains the rotational movement of the blank in a horizontal plane parallel to the top plate portion is formed by a bead in the press-molding process. It is a figure which shows the example of. 本発明の実施の形態に係るプレス成形品であって、湾曲の中央部におけるフランジ部のフランジ幅が広くされたプレス成形品の一例を示す図である。It is a figure which shows an example of the press-molded article which concerns on embodiment of this invention, in which the flange width of the flange portion in the central portion of a curve is widened. 本発明の実施の形態に係るプレス成形品であって、湾曲の中央部におけるフランジ部のフランジ幅を広くしたプレス成形品のプレス成形過程において割れが抑制される理由を説明する図である。It is a figure explaining the reason why cracking is suppressed in the press molding process of the press-molded article which concerns on embodiment of this invention and widens the flange width of the flange portion in the central part of a curve. 上面視で凹状に湾曲した部位を有するプレス成形品のプレス成形過程において発生する割れとしわを説明する図である。It is a figure explaining the crack and the wrinkle which occur in the press molding process of the press-molded article which has the concave curved part in the top view. 上面視で凹状に湾曲したプレス成形品のプレス成形過程において割れが生じるメカニズムを説明する図である。It is a figure explaining the mechanism which crack occurs in the press molding process of the press-molded article which was curved concavely in the top view. 上面視で凹状に湾曲したプレス成形品のプレス成形過程における材料移動を説明する図である。It is a figure explaining the material movement in the press molding process of the press-molded article which was curved concavely in the top view.

本発明の実施の形態に係るプレス成形品について、図1〜図8に基づいて、以下に説明する。 The press-molded article according to the embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

本実施の形態に係るプレス成形品1は、一例として図1に示すように、天板部3と、天板部3からパンチ肩部5を介して連続する縦壁部7と、縦壁部7からダイ肩部9を介して連続するフランジ部11とを有し、上面視で凹状に湾曲した湾曲部位13と、湾曲部位13における湾曲の両端(図1中の破線)から直線状に延在する直線部位15とを備えたものであって、湾曲部位13におけるパンチ肩部5の曲げ半径が、湾曲の中央部から端部側に向かって大きくなっている。 As an example, as shown in FIG. 1, the press-molded product 1 according to the present embodiment has a top plate portion 3, a vertical wall portion 7 continuous from the top plate portion 3 via a punch shoulder portion 5, and a vertical wall portion. It has a flange portion 11 that is continuous from 7 to the die shoulder portion 9 and extends linearly from both ends (broken line in FIG. 1) of the curved portion 13 that is concavely curved in the top view and the curved portion 13. It is provided with the existing straight line portion 15, and the bending radius of the punch shoulder portion 5 at the curved portion 13 increases from the central portion of the curvature toward the end portion side.

プレス成形品1のプレス成形過程において湾曲部位13におけるフランジ部11の割れと天板部3やパンチ肩部5のしわの双方が抑制される理由を、プレス成形過程における材料の移動を模式的に示した図2に基づいて説明する。なお、図2中の破線は、湾曲の両端(湾曲部位13と直線部位15との境界)を示す。 The reason why both the crack of the flange portion 11 at the curved portion 13 and the wrinkles of the top plate portion 3 and the punch shoulder portion 5 are suppressed in the press molding process of the press-molded product 1 is schematically the movement of the material in the press molding process. This will be described with reference to FIG. 2 shown. The broken line in FIG. 2 indicates both ends of the curve (the boundary between the curved portion 13 and the straight portion 15).

パンチ肩部5は、湾曲の端部側における曲げ半径Rp,1(図2(b))が湾曲の中央部における曲げ半径Rp,2(図2(c))よりも大きくなるように、湾曲の中央部から端部側に向かって曲げ半径が大きくなっている。そのため、図2(a)中の黒塗り矢印で示すように、材料はパンチ肩部5の湾曲の端部側から中央部に向かって容易に移動し、湾曲の中央部のフランジ部11側に引き込まれる。
これに対し、パンチ肩部5の湾曲の中央部は、湾曲の端部側や直線部位15に比べて曲げ半径が小さいので、プレス成形過程において材料が移動しにくい。
In the punch shoulder portion 5, the bending radius R p, 1 (FIG. 2 (b)) at the end side of the curve is larger than the bending radius R p, 2 (FIG. 2 (c)) at the center of the curve. , The bending radius increases from the center of the curve toward the end. Therefore, as shown by the black arrow in FIG. 2A, the material easily moves from the curved end side of the punch shoulder portion 5 toward the central portion, and moves toward the flange portion 11 side of the curved central portion. Be drawn in.
On the other hand, since the bending radius of the curved central portion of the punch shoulder portion 5 is smaller than that of the curved end side or the straight portion 15, the material is difficult to move in the press molding process.

そのため、プレス成形品1は、そのプレス成形過程において、湾曲の端部側における天板部3から湾曲の中央部におけるフランジ部11に向かって材料が移動されるので、湾曲部位13におけるフランジ部11の割れが抑制されるとともに、湾曲部位13の天板部3とパンチ肩部5におけるしわが抑制される。 Therefore, in the press-molded product 1, in the press-molding process, the material is moved from the top plate portion 3 on the curved end side toward the flange portion 11 in the central portion of the curved portion, so that the flange portion 11 in the curved portion 13 is moved. Cracks are suppressed, and wrinkles on the top plate portion 3 and the punch shoulder portion 5 of the curved portion 13 are suppressed.

また、本実施の形態に係るプレス成形方法は、ダイ肩部9の最小曲げ半径をパンチ肩部5の最小曲げ半径よりも小さくすることが好ましい。
ここで、ダイ肩部9の最小曲げ半径とは、湾曲部位13におけるダイ肩部9の最も小さい曲げ半径である。なお、プレス成形品1においては、図2に示すように、湾曲の中央部から端部側にわたってダイ肩部9の曲げ半径Rdは一定であるため、ダイ肩部9の最小曲げ半径はRdとなる。
一方、パンチ肩部5の最小曲げ半径とは、湾曲部位13におけるパンチ肩部5の最も小さい曲げ半径である。そして、プレス成形品1においては、図2に示すように、湾曲の中央部から端部側に向かってパンチ肩部5の曲げ半径が大きくなっているため、パンチ肩部5の最小曲げ半径は、湾曲の中央部における曲げ半径Rp,2である。
このように、ダイ肩部9の最小曲げ半径(=Rd)をパンチ肩部5の最小曲げ半径(=Rp,2)よりも小さくすることにより、プレス成形過程においてダイ肩部9における材料移動を拘束して、その分、プレス成形過程において材料を天板部3側からフランジ部11側に強く引き込むことができる。その結果、湾曲の中央部のフランジ部11の割れと天板部3やパンチ肩部5のしわをさらに抑制することができる。
Further, in the press molding method according to the present embodiment, it is preferable that the minimum bending radius of the die shoulder portion 9 is smaller than the minimum bending radius of the punch shoulder portion 5.
Here, the minimum bending radius of the die shoulder portion 9 is the smallest bending radius of the die shoulder portion 9 at the curved portion 13. In the press-molded product 1, as shown in FIG. 2, since the bending radius R d of the die shoulder portion 9 is constant from the central portion to the end side of the curvature, the minimum bending radius of the die shoulder portion 9 is R. It becomes d.
On the other hand, the minimum bending radius of the punch shoulder portion 5 is the smallest bending radius of the punch shoulder portion 5 at the curved portion 13. Then, in the press-molded product 1, as shown in FIG. 2, since the bending radius of the punch shoulder portion 5 increases from the central portion of the curve toward the end side, the minimum bending radius of the punch shoulder portion 5 is set. , The bending radius R p, 2 at the center of the curve.
In this way, by making the minimum bending radius (= R d ) of the die shoulder portion 9 smaller than the minimum bending radius (= R p, 2 ) of the punch shoulder portion 5, the material in the die shoulder portion 9 in the press molding process. By restraining the movement, the material can be strongly drawn from the top plate portion 3 side to the flange portion 11 side in the press molding process. As a result, cracks in the flange portion 11 at the center of the curve and wrinkles in the top plate portion 3 and the punch shoulder portion 5 can be further suppressed.

本実施の形態に係るプレス成形品1は、図1に示したように、湾曲部位13におけるパンチ肩部5の曲げ半径が、湾曲の中央部から端部に向かって大きいものであったが、本実施の形態の他の態様に係るプレス成形品21は、図3に一例として示すように、湾曲部位33におけるパンチ肩部25の曲げ半径が、湾曲の中央部から端部側に向かって大きくなっており、湾曲部位33におけるダイ肩部29の曲げ半径が湾曲部位33の湾曲の中央部から端部側に向かって小さくなっている。 In the press-formed product 1 according to the present embodiment, as shown in FIG. 1, the bending radius of the punch shoulder portion 5 at the curved portion 13 is large from the central portion to the end portion of the curved portion. In the press-formed product 21 according to another aspect of the present embodiment, as shown as an example in FIG. 3, the bending radius of the punch shoulder portion 25 at the curved portion 33 increases from the central portion to the end side of the curved portion 33. The bending radius of the die shoulder portion 29 at the curved portion 33 decreases from the central portion of the curvature of the curved portion 33 toward the end portion side.

プレス成形品21のプレス成形過程において湾曲部位33におけるフランジ部31の割れと天板部23やパンチ肩部25のしわの双方が抑制される理由を、プレス成形過程における材料の移動を模式的に示した図4に基づいて説明する。なお、図4中の破線は、湾曲の両端(湾曲部位33と直線部位35との境界)を示す。 The reason why both the crack of the flange portion 31 at the curved portion 33 and the wrinkles of the top plate portion 23 and the punch shoulder portion 25 are suppressed in the press molding process of the press-molded product 21 is schematically the movement of the material in the press molding process. This will be described with reference to FIG. 4 shown. The broken line in FIG. 4 indicates both ends of the curve (the boundary between the curved portion 33 and the straight portion 35).

ダイ肩部29は、湾曲の中央部における曲げ半径Rd,2(図4(c))よりも湾曲の端部側における曲げ半径Rd,1(図4(b))が小さくなっている。そのため、湾曲凹部(図4(a)に示すD、すなわち、湾曲部位33におけるフランジ部31の縦壁部27との付け根)に向かうフランジの材料移動が容易になり、かつ、フランジの湾曲(周方向)に引っ張る材料移動が起きにくい。 The die shoulder portion 29 has a smaller bending radius R d, 1 (FIG. 4 (b)) on the curved end side than the bending radius R d, 2 (FIG. 4 (c)) at the center of the curve. .. Therefore, the material of the flange can be easily moved toward the curved recess (D shown in FIG. 4A, that is, the base of the flange portion 31 at the curved portion 33 with the vertical wall portion 27), and the flange is curved (periphery). Material movement that pulls in the direction) is unlikely to occur.

その結果、プレス成形品21は、そのプレス成形過程において、湾曲部位33におけるフランジ部31の割れがさらに抑制される。 As a result, in the press-molded product 21, cracking of the flange portion 31 at the curved portion 33 is further suppressed in the press-molding process.

また、本実施の形態の他の態様に係るプレス成形方法は、湾曲部位33におけるダイ肩部29の最小曲げ半径をパンチ肩部25の最小曲げ半径よりも小さくすることが好ましい。
ここで、ダイ肩部29の最小曲げ半径は、湾曲部位33におけるダイ肩部29の最も小さい曲げ半径であり、図4(b)に示すように、湾曲の端部側における曲げ半径Rd,1である。
一方、パンチ肩部25の最小曲げ半径は、湾曲部位33におけるパンチ肩部25の最も小さい曲げ半径であり、図4(c)に示すように、湾曲の中央部における曲げ半径Rp,2である。
このように、ダイ肩部29の最小曲げ半径(=Rd,1)をパンチ肩部25の最小曲げ半径(=Rp,2)よりも小さくすることにより、パンチ肩部25の湾曲の端部側の曲げ半径Rp,1は、パンチ肩部25の(湾曲の中央部の)最小曲げ半径Rp,2よりさらに大きいため、プレス成形過程において材料を天板部23側からフランジ部31側に強く引き込むことができる。その結果、湾曲部位33におけるフランジ部31の割れと天板部23やパンチ肩部25のしわをさらに抑制することができる。
Further, in the press molding method according to another aspect of the present embodiment, it is preferable that the minimum bending radius of the die shoulder portion 29 at the curved portion 33 is smaller than the minimum bending radius of the punch shoulder portion 25.
Here, the minimum bending radius of the die shoulder portion 29 is the smallest bending radius of the die shoulder portion 29 at the curved portion 33, and as shown in FIG. 4 (b), the bending radius R d, on the curved end side. It is 1.
On the other hand, the minimum bending radius of the punch shoulder portion 25 is the smallest bending radius of the punch shoulder portion 25 at the curved portion 33, and as shown in FIG. 4 (c), the bending radius R p, 2 at the central portion of the curvature. is there.
In this way, by making the minimum bending radius (= R d, 1 ) of the die shoulder 29 smaller than the minimum bending radius (= R p, 2 ) of the punch shoulder 25, the curved end of the punch shoulder 25 Since the bending radius R p, 1 on the portion side is further larger than the minimum bending radius R p, 2 (at the center of the curvature) of the punch shoulder portion 25, the material is pressed from the top plate portion 23 side to the flange portion 31 in the press forming process. Can be pulled strongly to the side. As a result, cracks in the flange portion 31 at the curved portion 33 and wrinkles in the top plate portion 23 and the punch shoulder portion 25 can be further suppressed.

上記の説明は、パンチ肩部5(図1)やパンチ肩部25(図3)の曲げ半径が湾曲の中央部から端部側に向かって大きく、さらにダイ肩部29(図3)の曲げ半径が湾曲の中央部から端部側に向かって小さいものであった。もっとも、本発明に係るプレス成形品は、図5に一例として示すプレス成形品41のように、パンチ肩部45の曲げ半径が湾曲の中央部から端部側に向かって大きく、ダイ肩部49の曲げ半径が湾曲の中央部から端部側に向かって小さいことに加え、湾曲部位53の端部側における天板部43に、プレス成形過程において天板部43に平行な水平面内のブランクの回転運動を拘束する回転運動拘束形状部57がさらに形成されたものであってもよい。 In the above description, the bending radius of the punch shoulder portion 5 (FIG. 1) and the punch shoulder portion 25 (FIG. 3) is large from the central portion to the end side of the curvature, and the bending of the die shoulder portion 29 (FIG. 3) is further performed. The radius was smaller from the center of the curve toward the end. However, in the press-molded product according to the present invention, as in the press-molded product 41 shown as an example in FIG. 5, the bending radius of the punch shoulder portion 45 increases from the central portion of the curve toward the end portion, and the die shoulder portion 49 In addition to the fact that the bending radius of the curve is small from the center of the curve toward the end side, the blank in the horizontal plane parallel to the top plate 43 in the press forming process is applied to the top plate 43 on the end side of the curved portion 53. The rotary motion restraint shape portion 57 that restrains the rotary motion may be further formed.

回転運動拘束形状部57は、直線部位55の縦壁部47とは反対側に連続する縦壁部59と天板部43との間に形成された曲げ形状である。
また、パンチ肩部45は、前述のプレス成形品1のパンチ肩部5と同様、湾曲の中央部から端部側に向かって曲げ半径が大きくなるように成形されたものである。
The rotational movement restraint shape portion 57 is a bent shape formed between the vertical wall portion 59 and the top plate portion 43 that are continuous on the side opposite to the vertical wall portion 47 of the straight portion 55.
Further, the punch shoulder portion 45 is formed so that the bending radius increases from the central portion of the curve toward the end portion side, similarly to the punch shoulder portion 5 of the press-molded product 1 described above.

このように、プレス成形品41は、プレス成形過程において回転運動拘束形状部57が形成されることで、プレス成形に用いるブランクの天板部43に平行な水平面内の回転運動を抑制しつつ、湾曲の端部側及び直線部位55の天板部43からパンチ肩部45を介して湾曲の中央部のフランジ部51へと材料が移動し、湾曲部位53における天板部43やパンチ肩部45のしわが十分に抑制される。 In this way, in the press-molded product 41, the rotational movement restraint shape portion 57 is formed in the press molding process, so that the rotary motion in the horizontal plane parallel to the top plate portion 43 of the blank used for the press molding is suppressed, while suppressing the rotational movement. The material moves from the top plate 43 of the curved end side and the straight portion 55 to the flange 51 at the center of the curvature via the punch shoulder 45, and the top plate 43 and the punch shoulder 45 at the curved portion 53. Wrinkles are sufficiently suppressed.

なお、本発明は、図5に示す形状の回転運動拘束形状部57に限らず、例えば、図6のプレス成形品61の天板部43に形成されたビード形状の回転運動拘束形状部63のように、プレス成形過程において天板部43に平行な水平面内のブランクの回転運動を拘束することができる形状であればよい。なお、ビード形状とする場合にあっては、回転運動拘束形状部63のような凹状に限らず、凸状であってもよい。 The present invention is not limited to the rotary motion restraint shape portion 57 having the shape shown in FIG. 5, for example, the bead-shaped rotary motion restraint shape portion 63 formed on the top plate portion 43 of the press-molded product 61 of FIG. As described above, the shape may be any shape that can restrain the rotational movement of the blank in the horizontal plane parallel to the top plate portion 43 in the press molding process. In the case of the bead shape, the shape is not limited to the concave shape as in the rotary motion restraint shape portion 63, but may be a convex shape.

また、図5に示す回転運動拘束形状部57や、図6に示す回転運動拘束形状部63は、湾曲部位53の端部から直線部位55に対応する部位にわたって形成されたものであるが、回転運動拘束形状部の位置及び範囲に関しては、湾曲部位53の端部のみに対応する部位、又は、直線部位55のみに対応する部位に形成されたものを排除するものではない。 Further, the rotary motion restraint shape portion 57 shown in FIG. 5 and the rotary motion restraint shape portion 63 shown in FIG. 6 are formed from the end portion of the curved portion 53 to the portion corresponding to the straight line portion 55, but the rotation Regarding the position and range of the motion restraint shape portion, those formed in the portion corresponding only to the end portion of the curved portion 53 or the portion corresponding only to the straight portion 55 are not excluded.

さらに、本発明に係るプレス成形品は、上記のパンチ肩部、ダイ肩部の曲げ半径に加えて図7に例示するプレス成形品71のように、湾曲部位83のフランジ幅が、湾曲の端部側に比べて中央部の方が広いものであってもよい。 Further, in the press-molded product according to the present invention, in addition to the bending radii of the punch shoulder portion and the die shoulder portion described above, as in the press-molded product 71 illustrated in FIG. 7, the flange width of the curved portion 83 is the curved end. The central portion may be wider than the portion side.

図7に示すプレス成形品71の作用効果は以下のとおりである。
例えば、前述したプレス成形品1は、図8(a)に示すように、プレス成形するとプレス成形品1の形状となるような形状のブランク91を用いてプレス成形することで得られる。この場合、ブランク91におけるフランジ相当部93が、プレス成形品1のフランジ部11(図1)となる。
The effects of the press-molded product 71 shown in FIG. 7 are as follows.
For example, as shown in FIG. 8A, the above-mentioned press-molded product 1 can be obtained by press-molding using a blank 91 having a shape that becomes the shape of the press-molded product 1 when press-molded. In this case, the flange corresponding portion 93 of the blank 91 becomes the flange portion 11 (FIG. 1) of the press-molded product 1.

これに対し、図7に示すプレス成形品71は、図8(b)に示すように、フランジ部81に相当するフランジ相当部97に余肉(図中のハッチングされた領域)を増やしたブランク95を用いてプレス成形される。 On the other hand, in the press-molded product 71 shown in FIG. 7, as shown in FIG. 8 (b), a blank in which the margin (hatched region in the figure) is increased in the flange corresponding portion 97 corresponding to the flange portion 81. It is press-molded using 95.

このようなブランク95を用いてプレス成形品71をプレス成形すると、湾曲部位83におけるフランジ部81の材料が伸びにくくなる分、フランジ部81を形成するのに足りない材料が天板部73側からパンチ肩部75及び縦壁部77を介して引き込まれてくるようになる。
その結果、湾曲部位83における湾曲の中央部に向かう材料が増加して、フランジ部81の割れがさらに抑制される。
When the press-molded product 71 is press-molded using such a blank 95, the material of the flange portion 81 at the curved portion 83 becomes difficult to stretch, so that the material insufficient for forming the flange portion 81 is from the top plate portion 73 side. It comes to be pulled in through the punch shoulder portion 75 and the vertical wall portion 77.
As a result, the amount of material toward the central portion of the curve at the curved portion 83 increases, and cracking of the flange portion 81 is further suppressed.

図7に示すプレス成形品71のように、湾曲部位83におけるフランジ部81のフランジ幅が湾曲の端部側に比べて中央部が広い場合、湾曲の中央部におけるフランジ幅が端部側におけるフランジ幅の1.1倍〜1.5倍であることが好ましい。 When the flange width of the flange portion 81 in the curved portion 83 is wider in the central portion than in the curved end side as in the press-molded product 71 shown in FIG. 7, the flange width in the central portion of the curved portion is the flange on the end side. It is preferably 1.1 to 1.5 times the width.

湾曲の中央部におけるフランジ幅が1.1倍未満の場合では、プレス成形過程において天板部73からフランジ部81側へと材料を引き込む力がそれほど増加しない。
また、湾曲の中央部におけるフランジ幅が1.5倍よりも広い場合、フランジ部81のフランジ幅が広すぎて他の部品と接合するときに邪魔になるので、後工程でフランジ幅が狭くなるようにフランジ部81を所定のフランジ幅に切り落とすことを要し、作業工程が増えて、さらに歩留りが低下する。
When the flange width at the central portion of the curve is less than 1.1 times, the force for drawing the material from the top plate portion 73 to the flange portion 81 side does not increase so much in the press forming process.
Also, if the flange width at the center of the curve is wider than 1.5 times, the flange width of the flange portion 81 is too wide and interferes with joining with other parts, so the flange width should be narrowed in the subsequent process. It is necessary to cut off the flange portion 81 to a predetermined flange width, which increases the number of work steps and further reduces the yield.

なお、本発明の実施の形態に係るプレス成形品1は、例えば図1に示すように、湾曲部位13の湾曲の両端から延在する直線部位15を有するものであったが、本発明は、湾曲部位のみを有するプレス成形品や、湾曲の一端のみから延在する直線部位を有するプレス成形品であってもよく、直線部位の有無は問わない。 The press-molded product 1 according to the embodiment of the present invention has, for example, as shown in FIG. 1, having straight portions 15 extending from both ends of the curvature of the curved portion 13, but the present invention has the present invention. A press-molded product having only a curved portion or a press-molded product having a straight portion extending from only one end of the curvature may be used, and the presence or absence of the straight portion may or may not be used.

また、プレス成形品1は、パンチ肩部5の曲げ半径が、湾曲の中央部から両方の端部側に向かって大きいものであったが、本発明に係るプレス成形品は、湾曲の中央部からいずれか一方の端部側に向かって大きいものであってもよい。 Further, in the press-molded product 1, the bending radius of the punch shoulder portion 5 is large from the central portion of the curve toward both end sides, but in the press-molded product according to the present invention, the central portion of the curve is formed. It may be larger toward the end side of either one.

同様に、プレス成形品21(図3)は、ダイ肩部29の湾曲の曲率半径が、湾曲の中央部から両者の端部側に向かって小さいものであったが、本発明に係るプレス成形品は、湾曲の中央部からいずれか一方の端部側に向かって小さいものであってもよい。 Similarly, in the press-molded product 21 (FIG. 3), the radius of curvature of the curvature of the die shoulder portion 29 is smaller from the central portion of the curvature toward the end side of both, but the press molding according to the present invention. The article may be smaller from the center of the curvature towards either end.

なお、本発明に係るプレス成形品は、そのプレス成形に供するブランクの素材とする金属板の種類に制限は特にないが、延性の低い金属板を用いる場合に好ましく適用することができる。具体的には、引張強度が440MPa級以上1600MPa級以下、板厚が0.5mm以上3.6mm以下の金属板が好ましい。 The press-molded product according to the present invention is not particularly limited in the type of metal plate used as the material of the blank used for the press-molding, but can be preferably applied when a metal plate having low ductility is used. Specifically, a metal plate having a tensile strength of 440 MPa class or more and 1600 MPa class or less and a plate thickness of 0.5 mm or more and 3.6 mm or less is preferable.

引張強度が440MPa級未満の金属板は、延性が高いため伸びフランジ変形による割れが起こりにくく、本発明を用いる利点が少ない。ただし、プレス成形が難しい部品形状であれば、引張強度が440MPa級未満の金属板であっても、本発明のプレス成形品に用いることが好ましい。
引張強度の上限は特にないが、1600MPa級を超える金属板は延性が乏しいため、パンチ肩部やダイ肩部での割れが発生しやすくなり、プレス成形できない可能性がある。
A metal plate having a tensile strength of less than 440 MPa class has high ductility, so that cracking due to deformation of the stretch flange is unlikely to occur, and there is little advantage in using the present invention. However, if the shape of the part is difficult to press-mold, even a metal plate having a tensile strength of less than 440 MPa class is preferably used for the press-molded product of the present invention.
There is no particular upper limit to the tensile strength, but since metal plates exceeding 1600 MPa class have poor ductility, cracks are likely to occur at the punch shoulders and die shoulders, and press molding may not be possible.

なお、本発明に係るプレス成形品は、上面視で湾曲するL字形状やT字形状、Y字形状、S字形状の部位を有する自動車部品として好ましく適用することができ、これらの自動車部品のプレス成形過程における割れとしわが抑制される。このような自動車部品の具体例としては、L字形状の部位を有するAピラーロア等、T字形状の部位を有するBピラー等、S字形状の部位を有するリアサイドメンバー等、が挙げられる。 The press-molded product according to the present invention can be preferably applied as an automobile part having an L-shaped, T-shaped, Y-shaped, or S-shaped portion that is curved in a top view, and these automobile parts can be used. Cracks and wrinkles in the press molding process are suppressed. Specific examples of such automobile parts include an A-pillar lower having an L-shaped portion, a B-pillar having a T-shaped portion, a rear side member having an S-shaped portion, and the like.

本発明に係るプレス成形品の作用効果について、具体的なプレス成形実験を行ったので、以下に説明する。 A specific press-molding experiment has been conducted on the action and effect of the press-molded product according to the present invention, which will be described below.

プレス成形実験では、表1に示す材料特性の鋼板をブランクとし、前述の実施の形態で示したプレス成形品1(図1)、プレス成形品21(図3)、プレス成形品41(図5)、プレス成形品61(図6)を成形対象とし、フォーム成形したものを発明例とした。 In the press molding experiment, the steel sheet having the material properties shown in Table 1 was used as a blank, and the press molded product 1 (FIG. 1), the press molded product 21 (FIG. 3), and the press molded product 41 (FIG. 5) shown in the above-described embodiment were used as blanks. ), The press-molded product 61 (FIG. 6) was used as a molding target, and a foam-molded product was used as an example of the invention.

なお、各プレス成形品の縦壁部の高さ方向中央における湾曲部位の湾曲の半径は153mmとし、湾曲部位におけるパンチ肩部の最も小さい曲げ半径は7mm、ダイ肩部の最も小さい曲げ半径は6mm、縦壁部のプレス成形方向の縦壁高さは60mm、フランジ部のフランジ幅は、プレス成形品1では湾曲の中央部で30mm、湾曲の端部側で25mmとし、プレス成形品21、41、61では湾曲の中央部で10mm、湾曲の端部側で25mmとした。 The radius of curvature of the curved portion at the center of the vertical wall of each press-formed product in the height direction is 153 mm, the smallest bending radius of the punch shoulder at the curved portion is 7 mm, and the smallest bending radius of the die shoulder is 6 mm. The height of the vertical wall in the press molding direction of the vertical wall is 60 mm, and the flange width of the flange is 30 mm at the center of the curve and 25 mm at the end of the curve in the press molded product 1, and the press molded products 21, 41. , 61 was set to 10 mm at the center of the curve and 25 mm at the end of the curve.

Figure 0006897841
Figure 0006897841

プレス成形実験において成形対象としたプレス成形品におけるパンチ肩部の曲げ半径Rpとダイ肩部の曲げ半径Rdを表2及び表3に示す。なお、表2及び表3に示すパンチ肩部の曲げ半径Rpの比率は、パンチ肩部の稜線方向において最も大きい曲げ半径と最も小さい曲げ半径との比率である。同様に、表2及び表3に示すダイ肩部の曲げ半径Rdの比率は、ダイ肩部の稜線方向において最も小さい曲げ半径と最も大きい曲げ半径との比率である。 Tables 2 and 3 show the bending radius R p of the punch shoulder and the bending radius R d of the die shoulder in the press-molded product to be molded in the press molding experiment. The ratio of the bending radius R p of the punch shoulder portion shown in Tables 2 and 3 is the ratio of the largest bending radius to the smallest bending radius in the ridgeline direction of the punch shoulder portion. Similarly, the ratio of the bending radius R d of the die shoulder shown in Tables 2 and 3 is the ratio of the smallest bending radius to the largest bending radius in the ridgeline direction of the die shoulder.

さらに、プレス成形実験では、比較対象として、特許文献1に開示されている方法に従ってプレス成形した図9に示すプレス成形品101を従来例1とし、プレス成形品101の天板部103に相当する部位をパッドで押さえつつ、ブランクの回転運動を許容した状態でプレス成形した。 Further, in the press molding experiment, as a comparison target, the press molded product 101 shown in FIG. 9 which was press molded according to the method disclosed in Patent Document 1 is set as Conventional Example 1, and corresponds to the top plate portion 103 of the press molded product 101. While pressing the part with a pad, press molding was performed in a state where the rotational movement of the blank was allowed.

従来例1(図9)において、湾曲部位113の湾曲の曲率半径、ダイ肩部109の曲げ半径及び縦壁部107の縦壁高さは、発明例に係るプレス成形品と同じとした。
そして、従来例1においては、湾曲部位113におけるパンチ肩部105の曲げ半径を稜線方向に一定(=7mm)とした。
In Conventional Example 1 (FIG. 9), the radius of curvature of the curve of the curved portion 113, the radius of curvature of the die shoulder portion 109, and the height of the vertical wall of the vertical wall portion 107 are the same as those of the press-molded product according to the invention example.
Then, in the conventional example 1, the bending radius of the punch shoulder portion 105 at the curved portion 113 is set to be constant (= 7 mm) in the ridge line direction.

そして、発明例及び従来例に係る各プレス成形品における割れとしわを評価した。
割れは、湾曲部位の中央部のフランジ部先端C(図2(a))における板厚減少率を算出し、その値が小さいほど割れ抑制に優れると評価した。
一方、しわは、湾曲部位におけるフランジ部側の天板部及びパンチ肩部を目視により官能評価し、顕著なしわがある場合を「×」、目視で確認できるが部品性能上許容できる微小なしわがある場合を「△」、しわが目視で確認できない場合を「○」、とした。
表2及び表3に、各プレス成形品について割れとしわを評価した結果を示す。
Then, cracks and wrinkles in each press-molded product according to the invention example and the conventional example were evaluated.
For cracks, the plate thickness reduction rate at the tip C of the flange portion at the center of the curved portion (FIG. 2A) was calculated, and it was evaluated that the smaller the value, the better the crack suppression.
On the other hand, wrinkles are sensory-evaluated on the top plate and punch shoulders on the flange side at the curved portion, and if there are remarkable wrinkles, they can be visually confirmed as "x", but there are minute wrinkles that are acceptable in terms of component performance. The case was marked with "Δ", and the case where wrinkles could not be visually confirmed was marked with "○".
Tables 2 and 3 show the results of evaluating cracks and wrinkles for each press-molded product.

Figure 0006897841
Figure 0006897841

Figure 0006897841
Figure 0006897841

従来例1においては、板厚減少率が18%と割れの抑制効果は小さく、また、微小なしわが発生した。 In Conventional Example 1, the plate thickness reduction rate was 18%, the crack suppressing effect was small, and minute wrinkles were generated.

発明例1は、パンチ肩部5の曲げ半径Rpを湾曲の中央から端部側に向かって比率1.1で大きくしたプレス成形品1をプレス成形したものである。表2に示すように、板厚減少率は17%であり従来例1に比べて低減し、しわの発生は見られなかった。 In Invention Example 1, a press-molded product 1 in which the bending radius R p of the punch shoulder portion 5 is increased from the center of the curve toward the end side by a ratio of 1.1 is press-molded. As shown in Table 2, the plate thickness reduction rate was 17%, which was lower than that of Conventional Example 1, and no wrinkles were observed.

発明例2は、パンチ肩部5の曲げ半径Rpの比率を1.5として発明例1よりも大きくしたものである。表2に示すように、板厚減少率は14%であり発明例1に比べてさらに低減し、また、しわの発生は見られなかった。 In the second invention, the ratio of the bending radius R p of the punch shoulder 5 is 1.5, which is larger than that of the first invention. As shown in Table 2, the plate thickness reduction rate was 14%, which was further reduced as compared with Invention Example 1, and no wrinkles were observed.

発明例3は、パンチ肩部5の曲げ半径Rpの比率を2.0として発明例2よりも大きくしたプレス成形品1をプレス成形したものである。表2に示すように、板厚減少率は12%であり発明例2よりも低減し、また、しわの発生は見られなかった。 Invention Example 3 is a press-molded product 1 in which the ratio of the bending radius R p of the punch shoulder portion 5 is 2.0, which is larger than that of Invention Example 2. As shown in Table 2, the plate thickness reduction rate was 12%, which was lower than that of Invention Example 2, and no wrinkles were observed.

発明例4は、パンチ肩部25の曲げ半径Rpを湾曲の中央から端部側に向かって比率1.5で大きくし、かつ、ダイ肩部29の曲げ半径Rdを湾曲の中央部から端部側に向かって比率0.9で小さくしたプレス成形品21をプレス成形したものである。表2に示すように、板厚減少率は13%であり、パンチ肩部25の曲げ半径Rpの比率が等しい発明例2に比べて低減し、また、しわの発生は見られなかった。 In Invention Example 4, the bending radius R p of the punch shoulder portion 25 is increased by a ratio of 1.5 from the center of the curvature toward the end side, and the bending radius R d of the die shoulder portion 29 is increased from the center portion to the end portion of the curvature. This is a press-molded product 21 whose size is reduced by a ratio of 0.9 toward the side. As shown in Table 2, the plate thickness reduction rate was 13%, which was reduced as compared with Invention Example 2 in which the ratio of the bending radius R p of the punch shoulder portion 25 was the same, and no wrinkles were observed.

発明例5は、ダイ肩部29の曲げ半径Rdの比率を0.75として発明例4よりも小さくしたプレス成形品21をプレス成形したものである。表2に示すように、板厚減少率は12%であって発明例4に比べてさらに低減し、また、しわの発生は見られなかった。 Invention Example 5 is a press-molded product 21 in which the ratio of the bending radius R d of the die shoulder portion 29 is 0.75 and is smaller than that of Invention Example 4. As shown in Table 2, the plate thickness reduction rate was 12%, which was further reduced as compared with Invention Example 4, and no wrinkles were observed.

発明例6は、ダイ肩部29の曲げ半径Rdの比率を0.5として発明例5よりもさらに小さくしたものである。表2に示すように、板厚減少率は10%であって発明例5に比べて低減し、また、しわの発生は見られなかった。 In Invention Example 6, the ratio of the bending radius R d of the die shoulder portion 29 is set to 0.5, which is further smaller than that of Invention Example 5. As shown in Table 2, the plate thickness reduction rate was 10%, which was reduced as compared with Invention Example 5, and no wrinkles were observed.

発明例7は、パンチ肩部45の曲げ半径Rpの比率を1.5、ダイ肩部49の曲げ半径Rdの比率を0.75とし、天板部43と縦壁部59との間に曲げ形状である回転運動拘束形状部57(図5)を形成したプレス成形品41をプレス成形したものである。表3に示すように、板厚減少率は14%と従来例1よりも低減し、また、しわの発生は見られなかった。 In Invention Example 7, the ratio of the bending radius R p of the punch shoulder portion 45 is 1.5, the ratio of the bending radius R d of the die shoulder portion 49 is 0.75, and the bending shape is formed between the top plate portion 43 and the vertical wall portion 59. This is a press-molded product 41 in which a certain rotational motion restraint shape portion 57 (FIG. 5) is formed. As shown in Table 3, the plate thickness reduction rate was 14%, which was lower than that of Conventional Example 1, and no wrinkles were observed.

発明例8は、パンチ肩部45の曲げ半径Rpの比率とダイ肩部49の曲げ半径Rdの比率を発明例7と等しくし、天板部43における湾曲の端部側から直線部位55にわたってビード形状の回転運動拘束形状部63を形成したプレス成形品61(図6)をプレス成形したものである。表3に示すように、板厚減少率は14%であり従来例1よりも低減し、また、しわの発生は見られなかった。 In Invention Example 8, the ratio of the bending radius R p of the punch shoulder portion 45 to the bending radius R d of the die shoulder portion 49 is made equal to that of Invention Example 7, and the straight portion 55 from the curved end side of the top plate portion 43 This is a press-molded product 61 (FIG. 6) in which a bead-shaped rotary motion restraint shape portion 63 is formed. As shown in Table 3, the plate thickness reduction rate was 14%, which was lower than that of Conventional Example 1, and no wrinkles were observed.

発明例9は、フランジ相当部93に余肉を付与した形状のブランク91を用いて、湾曲部位83の中央部におけるフランジ部81のフランジ幅を湾曲の端部側のフランジ幅(=25mm)の1.5倍とし、かつ、パンチ肩部5の曲げ半径Rpの比率を1.5としたプレス成形品71(図7)をプレス成形するものである。表3に示すように、板厚減少率は9%と低減して良好な結果であり、また、しわの発生は見られなかった。 In Invention Example 9, the flange width of the flange portion 81 at the center of the curved portion 83 is set to the flange width (= 25 mm) on the curved end side by using the blank 91 having a shape in which the flange corresponding portion 93 is provided with a surplus. A press-molded product 71 (FIG. 7) having a thickness of 1.5 times and a ratio of the bending radius R p of the punch shoulder portion 5 of 1.5 is press-molded. As shown in Table 3, the plate thickness reduction rate was reduced to 9%, which was a good result, and no wrinkles were observed.

発明例10は、フランジ相当部93に余肉を付与した形状のブランク91を用いて、発明例5と同様に、パンチ肩部5の曲げ半径Rpの比率を1.5、ダイ肩部の曲げ半径Rdの比率を0.75としたプレス成形品21をプレス成形したものである。表3に示すように、板厚減少率は7%と発明例9よりもさらに低減し、また、しわの発生は見られなかった。 In Invention Example 10, a blank 91 having a shape in which a flange corresponding portion 93 is provided with a surplus thickness is used, and similarly to Invention Example 5, the ratio of the bending radius R p of the punch shoulder portion 5 is 1.5, and the bending radius of the die shoulder portion. This is a press-molded product 21 having a ratio of R d of 0.75. As shown in Table 3, the plate thickness reduction rate was 7%, which was further reduced as compared with Invention Example 9, and no wrinkles were observed.

発明例11は、フランジ相当部93に余肉を付与した形状のブランク91を用いて、発明例7と同様に、パンチ肩部5の曲げ半径Rpの比率を1.5、ダイ肩部の曲げ半径Rdの比率を0.75とし、曲げ形状である回転運動拘束形状部57(図5)を形成したプレス成形品41をプレス成形したものである。表3に示すように、板厚減少率は9%と低減して良好な結果であり、また、しわの発生は見られなかった。 In Invention Example 11, a blank 91 having a shape in which a flange corresponding portion 93 is provided with a surplus thickness is used, and similarly to Invention Example 7, the ratio of the bending radius R p of the punch shoulder portion 5 is 1.5, and the bending radius of the die shoulder portion. The press-molded product 41 in which the rotational motion restraint shape portion 57 (FIG. 5), which is a bent shape, is formed by setting the ratio of R d to 0.75, is press-molded. As shown in Table 3, the plate thickness reduction rate was reduced to 9%, which was a good result, and no wrinkles were observed.

なお、比較例1は、特許文献2に開示される方法に従ってパンチ肩部105の曲げ半径Rpを従来例1に比べて一律に大きくしたプレス成形品101である。湾曲部位113におけるパンチ肩部105の曲げ半径Rpを、従来例1に比べて一律に1.5倍にして10.5mmにした。前掲した表3に示すように、板厚減少率は9%と低減して割れの抑制効果は良好であったが、顕著なしわが発生した。 Comparative Example 1 is a press-molded product 101 in which the bending radius R p of the punch shoulder portion 105 is uniformly increased as compared with the conventional example 1 according to the method disclosed in Patent Document 2. The bending radius R p of the punch shoulder 105 at the curved portion 113 was uniformly increased by 1.5 times as compared with the conventional example 1 to 10.5 mm. As shown in Table 3 above, the plate thickness reduction rate was reduced to 9% and the crack suppression effect was good, but remarkable wrinkles occurred.

以上、本発明に係るプレス成形品は、そのプレス成形過程において、湾曲部位におけるフランジ部の割れが抑制され、かつ、湾曲部位におけるフランジ部側の天板部やパンチ肩部のしわが抑制されることが実証された。 As described above, in the press-molded product according to the present invention, in the press-molding process, cracking of the flange portion at the curved portion is suppressed, and wrinkles of the top plate portion and the punch shoulder portion on the flange portion side at the curved portion are suppressed. It was proved.

1 プレス成形品
3 天板部
5 パンチ肩部
7 縦壁部
9 ダイ肩部
11 フランジ部
13 湾曲部位
15 直線部位
21 プレス成形品
23 天板部
25 パンチ肩部
27 縦壁部
29 ダイ肩部
31 フランジ部
33 湾曲部位
35 直線部位
41 プレス成形品
43 天板部
45 パンチ肩部
47 縦壁部
49 ダイ肩部
51 フランジ部
53 湾曲部位
55 直線部位
57 回転運動拘束形状部
59 縦壁部
61 プレス成形品
63 回転運動拘束形状部
71 プレス成形品
73 天板部
75 パンチ肩部
77 縦壁部
79 ダイ肩部
81 フランジ部
83 湾曲部位
85 直線部位
91 ブランク
93 フランジ相当部
95 ブランク
97 フランジ相当部
101 プレス成形品
103 天板部
105 パンチ肩部
107 縦壁部
109 ダイ肩部
111 フランジ部
113 湾曲部位
115 直線部位
1 Press-molded product 3 Top plate part 5 Punch shoulder part 7 Vertical wall part 9 Die shoulder part 11 Flange part 13 Curved part 15 Straight part 21 Press-molded product 23 Top plate part 25 Punch shoulder part 27 Vertical wall part 29 Die shoulder part 31 Flange 33 Curved part 35 Straight part 41 Press-molded product 43 Top plate part 45 Punch shoulder part 47 Vertical wall part 49 Die shoulder part 51 Flange part 53 Curved part 55 Straight part 57 Rotational motion restraint shape part 59 Vertical wall part 61 Press molding Product 63 Rotating motion restraint shape part 71 Press molded product 73 Top plate part 75 Punch shoulder part 77 Vertical wall part 79 Die shoulder part 81 Flange part 83 Curved part 85 Straight part 91 Blank 93 Flange equivalent part 95 Blank 97 Flange equivalent 101 Press Molded product 103 Top plate 105 Punch shoulder 107 Vertical wall 109 Die shoulder 111 Flange 113 Curved part 115 Straight part

Claims (6)

天板部と、該天板部からパンチ肩部を介して連続する縦壁部と、該縦壁部からダイ肩部を介して連続するフランジ部とを有し、上面視で凹状に湾曲した湾曲部位を備えたプレス成形品であって、
前記湾曲部位における前記パンチ肩部の曲げ半径が、湾曲の中央部から端部側に向かって大きくなっていることを特徴とするプレス成形品。
It has a top plate portion, a vertical wall portion continuous from the top plate portion via a punch shoulder portion, and a flange portion continuous from the vertical wall portion via a die shoulder portion, and is curved in a concave shape in a top view. It is a press-molded product with a curved part,
A press-molded product characterized in that the bending radius of the punch shoulder portion at the curved portion increases from the central portion of the curved portion toward the end portion side.
前記湾曲部位における前記ダイ肩部の曲げ半径が、湾曲の中央部から端部側に向かって小さくなっていることを特徴とする請求項1記載のプレス成形品。 The press-molded product according to claim 1, wherein the bending radius of the die shoulder portion at the curved portion becomes smaller from the central portion of the curved portion toward the end portion side. 前記ダイ肩部の最小曲げ半径が、前記パンチ肩部の最小曲げ半径より小さいことを特徴とする請求項1又は2に記載のプレス成形品。 The press-molded product according to claim 1 or 2, wherein the minimum bending radius of the die shoulder portion is smaller than the minimum bending radius of the punch shoulder portion. プレス成形過程においてブランクの回転運動を拘束する回転運動拘束形状部が前記湾曲の端部側における前記天板部に形成されていることを特徴とする請求項1乃至3のいずれか一項に記載のプレス成形品。 The invention according to any one of claims 1 to 3, wherein a rotary motion restraint shape portion that restrains the rotary motion of the blank in the press molding process is formed on the top plate portion on the end side of the curve. Press molded product. 前記湾曲部位における前記フランジ部の幅が、湾曲の端部側に比べて中央部の方が広いことを特徴とする請求項1乃至4のいずれか一項に記載のプレス成形品。 The press-molded product according to any one of claims 1 to 4, wherein the width of the flange portion at the curved portion is wider at the central portion than at the end side of the curved portion. 引張強度が440MPa級〜1600MPa級の金属板を用いてプレス成形されたことを特徴とする請求項1乃至5のいずれか一項に記載のプレス成形品。 The press-molded product according to any one of claims 1 to 5, wherein the press-molded product is press-molded using a metal plate having a tensile strength of 440 MPa class to 1600 MPa class.
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JP7439802B2 (en) 2021-07-21 2024-02-28 Jfeスチール株式会社 Press molding method and press mold

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JP7439802B2 (en) 2021-07-21 2024-02-28 Jfeスチール株式会社 Press molding method and press mold

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