JP5965159B2 - Molding method for press parts - Google Patents

Molding method for press parts Download PDF

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JP5965159B2
JP5965159B2 JP2012035781A JP2012035781A JP5965159B2 JP 5965159 B2 JP5965159 B2 JP 5965159B2 JP 2012035781 A JP2012035781 A JP 2012035781A JP 2012035781 A JP2012035781 A JP 2012035781A JP 5965159 B2 JP5965159 B2 JP 5965159B2
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forming
top surface
blank material
rigidity
width direction
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JP2013169578A (en
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小笠原　健一
健一 小笠原
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Topre Corp
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Topre Corp
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Priority to US13/719,764 priority patent/US20130213109A1/en
Priority to CN201210589587.5A priority patent/CN103286185B/en
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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
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/20—Bending sheet metal, not otherwise provided for
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Description

本発明は、プレス部品の成形方法に関する。   The present invention relates to a method for forming a pressed part.

従来から、天面部と該天面部の幅方向端縁から前記天面部に対して直交方向に屈曲して延在する側壁部と該側壁部の端縁から屈曲して前記天面部に沿って延在するフランジ部と、から断面ハット状に形成されるプレス部品をプレス成形する技術が知られている（例えば、特許文献１参照）。この特許文献１では、センターピラーを成形する例を示している。   Conventionally, a side wall portion extending from the top surface portion and a width direction edge of the top surface portion in a direction orthogonal to the top surface portion, and a side wall portion extending from the edge of the side wall portion and extending along the top surface portion. 2. Description of the Related Art A technique is known in which a press part formed into a hat shape in cross section is formed from an existing flange portion (see, for example, Patent Document 1). In this patent document 1, the example which shape | molds a center pillar is shown.

特開２０１０−３６２１７号公報JP 2010-36217 A

しかしながら、プレス部品が、平面視または側面視において湾曲した湾曲プレス部品である場合は、湾曲形状に起因した肉余りによってフランジ部にシワ等の成形不良が発生しやすいという問題があった。   However, when the pressed part is a curved pressed part that is curved in a plan view or a side view, there is a problem in that molding defects such as wrinkles are likely to occur in the flange portion due to the surplus due to the curved shape.

そこで、本発明は、湾曲プレス部品をプレス成形する場合にも、フランジ部におけるシワやシワ重なり等の成形不良の発生を抑制することができるプレス部品の成形方法を提供することを目的としている。   Accordingly, an object of the present invention is to provide a method for forming a pressed part that can suppress the occurrence of molding defects such as wrinkles and wrinkle overlap in the flange portion even when the curved press part is press-formed.

前記目的を達成するために、本発明は、天面部と、該天面部の幅方向端縁から前記天面部に対して交差する方向に屈曲して延在する側壁部と、該側壁部の端縁から屈曲して延在するフランジ部と、から断面ハット状に形成されると共に、前記天面部の幅方向端縁が長手方向に沿って湾曲して延在する形状の湾曲プレス部品をプレス成形するプレス部品の成形方法であって、平板状のブランク材の幅方向の片側の端部若しくは両側の端部のみに長手方向に沿って延在する高剛性部を成形する予備成形工程と、前記高剛性部を残した状態で前記平板状のブランク材の平板のままの本体部を成形して前記天面部と側壁部を形成する本成形工程と、前記高剛性部を押し潰して前記フランジ部を平坦に成形するフランジ部平坦化工程と、を有するプレス部品の成形方法を特徴とする。

In order to achieve the above object, the present invention provides a top surface portion, a side wall portion that bends and extends in a direction intersecting the top surface portion from a width direction end edge of the top surface portion, and an end of the side wall portion. A curved press part having a shape in which the edge in the width direction of the top surface portion is curved and extends along the longitudinal direction is formed by press-molding the flange portion that is bent from the edge and extended from the flange portion. What molding method der of press parts to the pre-forming step of forming the high rigidity portion extending only in the end portion or both end portions of one side in the width direction of a flat blank along the longitudinal direction, A main forming step of forming the main body portion of the flat blank material in the state of leaving the high rigidity portion to form the top surface portion and the side wall portion, and crushing the high rigidity portion to form the flange press with a flange portion flattening step of flat molded parts Wherein the molding process goods.

本発明によれば、長手方向に延在する高剛性部を残した状態で天面部と側壁部を成形するため、ブランク材の幅方向端部の剛性が高くなり、長手方向に縮む力に対して対抗力が大きくなる。従って、天面部と側壁部を成形する際に、湾曲形状に起因した肉余りによって長手方向に縮む力が作用しても、フランジ部におけるシワやシワ重なり等の成形不良の発生を抑制することができる。   According to the present invention, since the top surface portion and the side wall portion are formed with the highly rigid portion extending in the longitudinal direction remaining, the rigidity of the blank material in the width direction end portion is increased, and the force shrinks in the longitudinal direction. The resistance is increased. Therefore, when molding the top surface portion and the side wall portion, even if a force that shrinks in the longitudinal direction due to the surplus due to the curved shape acts, it is possible to suppress the occurrence of molding defects such as wrinkles and wrinkle overlap in the flange portion. it can.

本図のうち、（ａ）は本発明の第１実施形態による湾曲プレス部品を示す斜視図、（ｂ）は（ａ）のＡ−Ａ線による断面図である。Among these drawings, (a) is a perspective view showing a curved press part according to the first embodiment of the present invention, and (b) is a sectional view taken along line AA of (a). 本図のうち、（ａ）は本発明の第１実施形態において予備成形工程を終了した状態のブランク材の斜視図、（ｂ）は（ａ）のＢ−Ｂ断面図、（ｃ）はフランジ部平坦化工程を終了した状態の断面図である。Among these drawings, (a) is a perspective view of the blank material in a state in which the preforming step is completed in the first embodiment of the present invention, (b) is a sectional view taken along the line BB of (a), and (c) is a flange. It is sectional drawing of the state which complete | finished the partial planarization process. 実施例による湾曲プレス部品を成形するための金型を示す斜視図である。It is a perspective view which shows the metal mold | die for shape | molding the curved press component by an Example. 本成形工程の途中の成形状態を示す、図３のＣ−Ｃ断面図である。It is CC sectional drawing of FIG. 3 which shows the shaping | molding state in the middle of this shaping | molding process. 本成形工程の途中における実施例に係る湾曲プレス部品の斜視図である。It is a perspective view of the curved press part which concerns on the Example in the middle of this forming process. 比較例による本成形工程の途中の成形状態を示す、図３のＣ−Ｃ断面図である。It is CC sectional drawing of FIG. 3 which shows the shaping | molding state in the middle of this shaping | molding process by a comparative example. 本成形工程の途中の比較例に係る湾曲プレス部品の斜視図である。It is a perspective view of the curved press part which concerns on the comparative example in the middle of this forming process. 本図のうち、（ａ）は本発明の第２実施形態による湾曲プレス部品を示す斜視図、（ｂ）は（ａ）のＤ−Ｄ断面図である。Among these drawings, (a) is a perspective view showing a curved press part according to a second embodiment of the present invention, and (b) is a sectional view taken along the line DD of (a). 本図のうち、（ａ）は本発明の第２実施形態において予備成形工程を終了した状態のブランク材の斜視図、（ｂ）は（ａ）のＥ−Ｅ断面図、（ｃ）はフランジ部平坦化工程を終了した状態の断面図である。Among these drawings, (a) is a perspective view of a blank material in a state in which the preforming process is completed in the second embodiment of the present invention, (b) is a sectional view taken along line EE of (a), and (c) is a flange. It is sectional drawing of the state which complete | finished the partial planarization process. 本図のうち、（ａ）は本発明の第３実施形態による湾曲プレス部品を示す斜視図、（ｂ）は（ａ）のＦ−Ｆ断面図である。Among these drawings, (a) is a perspective view showing a curved press part according to a third embodiment of the present invention, and (b) is a sectional view taken along line FF in (a). 本図のうち、（ａ）は本発明の第３実施形態において予備成形工程を終了した状態のブランク材の斜視図、（ｂ）は（ａ）のＧ−Ｇ断面図、（ｃ）はフランジ部平坦化工程を終了した状態の断面図である。Among these drawings, (a) is a perspective view of a blank material in a state in which the preforming process is completed in the third embodiment of the present invention, (b) is a sectional view taken along line GG in (a), and (c) is a flange. It is sectional drawing of the state which complete | finished the partial planarization process. 本図のうち、（ａ）は本発明の第４実施形態による湾曲プレス部品を示す斜視図、（ｂ）は（ａ）のＨ−Ｈ断面図である。Among these drawings, (a) is a perspective view showing a curved press part according to a fourth embodiment of the present invention, and (b) is a sectional view taken along line HH of (a). 本図のうち、（ａ）は本発明の第４実施形態において予備成形工程を終了した状態のブランク材の斜視図、（ｂ）は（ａ）のＩ−Ｉ断面図、（ｃ）はフランジ部平坦化工程を終了した状態の断面図である。Among these drawings, (a) is a perspective view of the blank material in a state in which the preforming step is completed in the fourth embodiment of the present invention, (b) is a sectional view taken along the line II of (a), and (c) is a flange. It is sectional drawing of the state which complete | finished the partial planarization process. 本図のうち、（ａ）は本発明の他の実施形態によるブランク材を示す斜視図、（ｂ）は（ａ）のＪ−Ｊ断面図である。(A) is a perspective view which shows the blank material by other embodiment of this invention among this figure, (b) is JJ sectional drawing of (a). 本図のうち、（ａ）は本発明の他の実施形態による予備成形を終了した後のブランク材を示す斜視図、（ｂ）は（ａ）のＫ−Ｋ断面図である。Among these drawings, (a) is a perspective view showing a blank material after pre-forming according to another embodiment of the present invention, and (b) is a KK sectional view of (a). 本図のうち、（ａ）は本発明の他の実施形態によるフランジ部平坦化工程を終了した状態を示す斜視図、（ｂ）は（ａ）のＬ−Ｌ断面図である。(A) is a perspective view which shows the state which complete | finished the flange part planarization process by other embodiment of this invention among this figure, (b) is LL sectional drawing of (a).

以下、本発明の実施形態を図面に基づき説明する。なお、各図において、幅方向をＷ、長手方向をＬ、上方をＵＰＲ、下方をＬＷＲで示す。また、Ｗ方向から見た場合を側面視、ＵＰＲまたはＬＷＲの方向から見た場合を平面視、Ｌ方向から見た場合を正面視とする。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the width direction is W, the longitudinal direction is L, the upper direction is UPR, and the lower direction is LWR. Further, a case of viewing from the W direction is referred to as a side view, a case of viewing from the UPR or LWR direction is a plan view, and a case of viewing from the L direction is a front view.

[第１実施形態]
図１に示すように、第１実施形態による湾曲プレス部品１は、上側に配置されて長手方向Ｌに延在する天面部３と、該天面部３の幅方向端縁３ａから斜め下方（天面部３に交差する方向）に向けて延在する左右一対の側壁部５，５と、これらの側壁部５，５の下端５ａ，５ａ（端縁）から屈曲して左右両側に向けて延在するフランジ部７，７と、から断面ハット状に形成されている。 [First embodiment]
As shown in FIG. 1, the curved press part 1 according to the first embodiment includes a top surface portion 3 arranged on the upper side and extending in the longitudinal direction L, and a diagonally downward (top) portion from the widthwise edge 3 a of the top surface portion 3. A pair of left and right side wall portions 5, 5 extending in the direction intersecting the surface portion 3, and bending from the lower ends 5 a, 5 a (end edges) of these side wall portions 5, 5 and extending toward the left and right sides. The flange portions 7 and 7 are formed in a cross-sectional hat shape.

そして、前記天面部３の幅方向端縁３ａは、長手方向Ｌに沿って、側面視で上側ＵＰＲに凸の弧状に湾曲して形成されている。   The width direction edge 3a of the top surface portion 3 is formed along the longitudinal direction L so as to be curved in a convex arc shape on the upper UPR in a side view.

本実施形態によるプレス部品の成形方法は、予備成形工程、本成形工程、およびフランジ部平坦化工程を有する。   The method for forming a pressed part according to the present embodiment includes a preforming step, a main forming step, and a flange portion flattening step.

予備成形工程は、図２（ａ）（ｂ）に示すように、平板状のブランク材（不図示）の幅方向端部の両側に長手方向Ｌに沿って延在する高剛性部９を成形する工程である。具体的には、高剛性部９は、ブランク材２のように幅方向端部を上側ＵＰＲ（表面側）に向けて斜めに折り曲げた折曲部１１である。この折曲部１１と本体部１３との成す角度θは、例えば１０°〜９０°が好ましい。また、予備成形でのシワ発生を防ぐため、折曲部１１は直線状に形成することが好ましい。なお、予備成形工程後で、かつ、本成形工程前にブランク材２を加熱する。   As shown in FIGS. 2 (a) and 2 (b), the pre-molding step forms high-rigidity portions 9 extending along the longitudinal direction L on both sides of the widthwise end portion of a flat blank (not shown). It is a process to do. Specifically, the high-rigidity portion 9 is a bent portion 11 that is bent obliquely toward the upper UPR (surface side) as in the blank material 2. The angle θ formed by the bent portion 11 and the main body portion 13 is preferably 10 ° to 90 °, for example. Moreover, in order to prevent the wrinkle generation | occurrence | production by preforming, it is preferable to form the bending part 11 in linear form. Note that the blank material 2 is heated after the preliminary molding step and before the main molding step.

本成形工程は、加熱したブランク材２を詳細に後述する金型を用いて天面部３と側壁部５を成形する工程である。   The main forming step is a step of forming the top surface portion 3 and the side wall portion 5 using a die that will be described in detail later on the heated blank material 2.

フランジ部平坦化工程は、図２（ｃ）に示すように、予備成形工程で成形した折曲部１１（高剛性部９）を前記金型によって押し潰してフランジ部を平坦に成形する工程である。このように、本成形工程とフランジ部平坦化工程は、ブランク材２が加熱された状態のもとに熱間プレスにて行う。   As shown in FIG. 2 (c), the flange portion flattening step is a step of flatly forming the flange portion by crushing the bent portion 11 (high rigidity portion 9) formed in the preforming step with the mold. is there. Thus, the main forming step and the flange portion flattening step are performed by hot pressing while the blank material 2 is heated.

このフランジ部平坦化工程が終了した後に急冷することによって、高強度化された図１に示す湾曲プレス部品１が完成する。   The curved press part 1 shown in FIG. 1 having high strength is completed by rapid cooling after the flange portion flattening step is completed.

[実施例]
次いで、第１実施形態による湾曲プレス部品を金型を用いて成形する手順を比較例と対比して具体的に説明する。 [Example]
Next, a procedure for forming the curved press part according to the first embodiment using a mold will be specifically described in comparison with a comparative example.

図３に示すように、金型２１は、上型２３と下型２５とから構成される。上型２３は、取付板２７と該取付板２７の下側に設けられた上側成形型２９とからなる。上側成形型２９は、正面視コ字状に形成されており、左右一対に配置されて下方に延びる上側成形部３１，３１と、これらの上側成形部３１，３１同士を橋渡しする連結部３２と、を有する。また、下型２５は、取付板３３と該取付板３３の上側に設けられた下側成形型３５とからなる。下側成形型３５は正面視Ｔ字状に形成されており、左右方向両側のフランジ部成形部３６，３６と、左右方向中央部を上方に突出させた下側成形部３７とからなる。この下側成形部３７は、一対の上側成形部３１，３１の間に嵌合される。そして、前記フランジ部成形部３６の上面３６ａと下側成形部３７の上面３７ａは、側面視で上側ＵＰＲに凸の弧状に湾曲して形成されている。なお、上側成形部３１の下面３１ｂと連結部３２の下面３２ｂも下側成形型３５の上面３６ａ，３７ａに対応して湾曲している。このように、本実施形態による金型２１は、シワ抑え（ブランクホルダー）等を備えていない、構造が簡素な金型（フォーム成形型）である。   As shown in FIG. 3, the mold 21 includes an upper mold 23 and a lower mold 25. The upper mold 23 includes an attachment plate 27 and an upper molding die 29 provided on the lower side of the attachment plate 27. The upper molding die 29 is formed in a U-shape when viewed from the front, and is formed as a pair of left and right upper molding parts 31, 31 extending downward, and a connecting part 32 that bridges the upper molding parts 31, 31 to each other. Have. The lower mold 25 includes a mounting plate 33 and a lower molding die 35 provided on the upper side of the mounting plate 33. The lower molding die 35 is formed in a T-shape when viewed from the front, and includes flange-shaped molding portions 36 and 36 on both sides in the left-right direction, and a lower molding portion 37 with the central portion in the left-right direction protruding upward. The lower molding portion 37 is fitted between the pair of upper molding portions 31 and 31. The upper surface 36a of the flange portion molding portion 36 and the upper surface 37a of the lower side molding portion 37 are formed to be curved in an arc shape convex to the upper UPR in a side view. The lower surface 31b of the upper molding part 31 and the lower surface 32b of the connecting part 32 are also curved corresponding to the upper surfaces 36a and 37a of the lower molding die 35. Thus, the metal mold | die 21 by this embodiment is a metal mold | die (form molding die) with a simple structure which is not provided with a wrinkle suppression (blank holder) etc.

図４に示すように、加熱したブランク材は、本成形工程では、ブランク材の幅方向中央部が下側成形部３７の上面に当たって天面部３が成形され、幅方向両側の部位が下側成形部３７の側面３７ｂと上側成形部３１の内側面３１ａとで挟持されて側壁部５が成形される。ここで、ブランク材の幅方向端部は、長手方向に沿って折曲部１１が形成されて剛性が高くなっているため、長手方向に縮む方向の力に対して対抗力が高い。従って、湾曲形状に起因した肉余りによるシワが発生しにくくなり、図５に示すように、フランジ部７にシワ４０が発生しにくくなる。なお、図４の状態から上側成形部３１がさらに下降すると、上側成形部３１の下面３１ｂとフランジ部成形部３６の上面３６ａとで折曲部１１を押し潰すことによって、シワが少なく、シワ重なりのない平坦なフランジ部７が成形される。   As shown in FIG. 4, in the main forming step, the heated blank material is formed such that the center portion in the width direction of the blank material hits the upper surface of the lower molding portion 37, the top surface portion 3 is molded, and the portions on both sides in the width direction are lower molding. The side wall portion 5 is molded by being sandwiched between the side surface 37 b of the portion 37 and the inner side surface 31 a of the upper molding portion 31. Here, since the bending part 11 is formed along the longitudinal direction and the rigidity is high, the edge part of the width direction of a blank material has a high opposing force with respect to the force of the direction shrunk in a longitudinal direction. Therefore, the wrinkles due to the surplus due to the curved shape are less likely to occur, and the wrinkles 40 are less likely to occur in the flange portion 7 as shown in FIG. When the upper molding part 31 is further lowered from the state of FIG. 4, the bent part 11 is crushed by the lower surface 31b of the upper molding part 31 and the upper surface 36a of the flange molding part 36, thereby reducing wrinkles and overlapping the wrinkles. A flat flange portion 7 having no gap is formed.

一方、図６に示すように、比較例に係る湾曲プレス部品１０１においては、ブランク材の幅方向端部は、折曲部が形成されておらず剛性が低くなっているため、長手方向に縮む方向の力に対して対抗力が低い。従って、図７に示すように、湾曲形状に起因した肉余りによるシワが発生しやすくなり、フランジ部７にシワ４０が多く発生する。なお、図６の状態から上側成形部３１がさらに下降すると、上側成形部３１の下面３１ｂとフランジ部成形部３６の上面３６ａとでフランジ部が成形される際、シワ重なりが発生する。   On the other hand, as shown in FIG. 6, in the curved press part 101 according to the comparative example, the end portion in the width direction of the blank material is not formed with a bent portion and has low rigidity, and thus contracts in the longitudinal direction. Low resistance to directional force. Accordingly, as shown in FIG. 7, wrinkles due to the surplus due to the curved shape are likely to occur, and many wrinkles 40 are generated in the flange portion 7. When the upper molding part 31 is further lowered from the state of FIG. 6, wrinkle overlap occurs when the flange part is molded between the lower surface 31 b of the upper molding part 31 and the upper surface 36 a of the flange part molding part 36.

以下に、本実施形態による作用効果を説明する。   Below, the effect by this embodiment is demonstrated.

（１）本実施形態によるプレス部品の成形方法は、天面部３と、該天面部３の幅方向端縁３ａから前記天面部３に対して交差する方向に屈曲して延在する側壁部５と、該側壁部５の端縁５ａから屈曲して延在するフランジ部７と、から断面ハット状に形成されると共に、前記天面部３の幅方向端縁３ａが長手方向Ｌに沿って湾曲して延在する形状の湾曲プレス部品１をプレス成形するプレス部品の成形方法である。   (1) The method of forming a pressed part according to the present embodiment includes a top surface portion 3 and a side wall portion 5 that is bent and extends in a direction intersecting the top surface portion 3 from a width direction edge 3a of the top surface portion 3. And a flange portion 7 that is bent and extends from the edge 5a of the side wall portion 5, and the widthwise edge 3a of the top surface portion 3 is curved along the longitudinal direction L. This is a press part molding method for press-molding the curved press part 1 having an extending shape.

そして、平板状のブランク材の幅方向端部に長手方向に沿って延在する折曲部１１（高剛性部９）を成形する予備成形工程と、前記高剛性部９を残した状態で前記天面部３と側壁部５を成形する本成形工程と、を有する。   And the preforming process which shape | molds the bending part 11 (high-rigidity part 9) extended along a longitudinal direction in the width direction edge part of a flat blank material, and the said state in the state which left the said high-rigidity part 9 A main molding step of molding the top surface portion 3 and the side wall portion 5.

このように、本実施形態によるプレス部品の成形方法では、長手方向に延在する折曲部１１を残した状態で天面部３と側壁部５を成形するため、ブランク材２の幅方向端部の剛性が高くなり、長手方向に縮む力に対して対抗力が大きくなる。従って、天面部３と側壁部５を成形する際に、湾曲形状に起因した肉余りによって長手方向に縮む力が作用しても、フランジ部７におけるシワやシワ重なり等の成形不良の発生を抑制することができる。   As described above, in the method for forming a pressed part according to the present embodiment, the top surface portion 3 and the side wall portion 5 are formed in a state where the bent portion 11 extending in the longitudinal direction is left. This increases the rigidity and increases the resistance against the force shrinking in the longitudinal direction. Therefore, when molding the top surface portion 3 and the side wall portion 5, even if a force that shrinks in the longitudinal direction due to the surplus due to the curved shape acts, the occurrence of molding defects such as wrinkles and wrinkle overlap in the flange portion 7 is suppressed. can do.

（２）前記高剛性部９は、ブランク材２の幅方向端部を表面側に向けて斜めに折り曲げた折曲部１１であるため、簡単な構造で、ブランク材２の幅方向端部の剛性を向上させることができる。
（３）本実施形態によるプレス部品の成形方法は、前記折曲部１１（高剛性部９）を押し潰して前記フランジ部７を平坦に成形するフランジ部平坦化工程をさらに有する。このため、フランジ部７におけるシワの発生を抑制して、平坦なフランジ部７を成形することができる。
（４）前記本成形工程および前記フランジ部平坦化工程を熱間プレスにて行うため、ブランク材２の幅方向端部に折曲部１１を形成して剛性を高める意義が更に増す。即ち、冷間プレスの場合は、熱間プレスよりもブランク材自体の剛性が高いため、長手方向に縮む方向に力がかかった場合やフランジ部を成形する際にフランジ部７にシワやシワ重なりが発生しにくい。一方、熱間プレスの場合は、冷間プレスよりもブランク材自体の剛性が低いため、長手方向に縮む方向に力がかかった場合やフランジ部を成形する際にフランジ部７にシワやシワ重なりが発生しやすい。従って、ブランク材２の幅方向端部に折曲部１１を形成して剛性を高めることによって、シワやシワ重なりの発生を効果的に抑制することができる。 (2) Since the high-rigidity portion 9 is a bent portion 11 that is bent obliquely with the width direction end portion of the blank material 2 facing the surface side, the structure has a simple structure and the width direction end portion of the blank material 2 Stiffness can be improved.
(3) The method for forming a pressed part according to the present embodiment further includes a flange portion flattening step of crushing the bent portion 11 (high rigidity portion 9) to form the flange portion 7 flat. For this reason, generation | occurrence | production of the wrinkle in the flange part 7 can be suppressed, and the flat flange part 7 can be shape | molded.
(4) Since the main forming step and the flange portion flattening step are performed by hot pressing, the significance of increasing the rigidity by forming the bent portion 11 at the end portion in the width direction of the blank 2 is further increased. That is, in the case of the cold press, the blank material itself has higher rigidity than the hot press, so that when the force is applied in the direction of contraction in the longitudinal direction or when the flange portion is formed, the flange portion 7 is wrinkled or wrinkled. Is unlikely to occur. On the other hand, in the case of hot pressing, since the rigidity of the blank material itself is lower than that of cold pressing, wrinkles or wrinkles overlap the flange portion 7 when a force is applied in the direction of contraction in the longitudinal direction or when the flange portion is formed. Is likely to occur. Therefore, the formation of wrinkles and wrinkle overlap can be effectively suppressed by forming the bent portions 11 at the end portions in the width direction of the blank material 2 to increase the rigidity.

[第２実施形態]
次いで、第２実施形態について説明するが、第１実施形態と同一構成部位には同一符号を付けて、その説明を省略する。 [Second Embodiment]
Next, the second embodiment will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

前記第１実施形態による湾曲プレス部品１は、天面部３の幅方向端縁３ａは、長手方向Ｌに沿って、側面視で上側ＵＰＲに凸の弧状に湾曲して形成されている。   In the curved press part 1 according to the first embodiment, the edge 3a in the width direction of the top surface portion 3 is formed along the longitudinal direction L so as to be curved in an arc shape convex to the upper UPR in a side view.

しかし、第２実施形態による湾曲プレス部品５１は、図８（ａ）に示すように、天面部５３における湾曲内側の幅方向端縁５３ａおよび湾曲外側の幅方向端縁５３ｂが、長手方向Ｌに沿って、平面視で弧状に湾曲して形成されている。なお、図８（ｂ）に示す断面形状は、第１実施形態に係る図１（ｂ）と同様の形状であり、天面部５３、側壁部５５およびフランジ部５７とからハット状に形成されている。また、フランジ部５７のうち、湾曲内側のフランジ部を５７ａ、湾曲外側のフランジ部を５７ｂで示す。   However, in the curved press part 51 according to the second embodiment, as shown in FIG. 8A, the curved inner edge 53 a and the curved outer edge 53 b on the top surface 53 are in the longitudinal direction L. Along this, it is curved in an arc shape in plan view. 8B is the same shape as FIG. 1B according to the first embodiment, and is formed in a hat shape from the top surface portion 53, the side wall portion 55, and the flange portion 57. Yes. Of the flange portions 57, the inner flange portion is indicated by 57a, and the outer flange portion is indicated by 57b.

本実施形態によるプレス部品の成形方法は、第１実施形態と同様に、予備成形工程、本成形工程、およびフランジ部平坦化工程を有する。   As with the first embodiment, the method for forming a pressed part according to the present embodiment includes a preforming step, a main forming step, and a flange portion flattening step.

予備成形工程は、図９（ａ）（ｂ）に示すように、平板状のブランク材（不図示）の幅方向端部の片側に長手方向に沿って延在する高剛性部９Ａを成形する工程である。具体的には、高剛性部９Ａは、ブランク材５２のように幅方向端部の左側を上側（表面側）に向けて斜めに折り曲げた折曲部５８である。この折曲部５８と本体部５９との成す角度θは、例えば１０°〜９０°が好ましい。また、折曲部５８は、湾曲プレス部品５１における平面視で湾曲外側の部位に設ける。また、予備成形工程でのシワ発生を防ぐために、折曲部５８は直線状に形成することが好ましい。   In the pre-molding step, as shown in FIGS. 9A and 9B, a high-rigidity portion 9A extending along the longitudinal direction is formed on one side of the end portion in the width direction of a flat blank (not shown). It is a process. Specifically, the high-rigidity portion 9 </ b> A is a bent portion 58 that is bent obliquely with the left side of the width direction end portion directed upward (surface side) like the blank material 52. The angle θ formed by the bent portion 58 and the main body portion 59 is preferably, for example, 10 ° to 90 °. Further, the bent portion 58 is provided at a portion outside the curve in the plan view of the curved press part 51. Further, in order to prevent wrinkling in the preforming process, it is preferable to form the bent portion 58 in a straight line.

本成形工程およびフランジ部平坦化工程は、第１実施形態と同様である。なお、本成形工程とフランジ部平坦化工程は、前述した第１実施形態と同様にブランク材が加熱された状態のもとに熱間プレスにて行う。   The main forming step and the flange portion flattening step are the same as in the first embodiment. Note that the main forming step and the flange portion flattening step are performed by hot pressing in a state where the blank material is heated as in the first embodiment described above.

本実施形態における作用効果は、第１実施形態と同様である。   The effect in this embodiment is the same as that of 1st Embodiment.

特に、シワが発生しやすい湾曲外側のフランジ部５７ｂに相当する幅方向端部に折曲部５８を形成して剛性を向上させたため、湾曲外側のフランジ部５７ｂにおけるシワやシワ重なりの発生を効果的に抑制することができる。   In particular, since the bending portion 58 is formed at the end in the width direction corresponding to the flange portion 57b on the curved outer side where wrinkles are likely to occur, and the rigidity is improved, the occurrence of wrinkles and wrinkle overlap in the flange portion 57b on the curved outer side is effective. Can be suppressed.

[第３実施形態]
次いで、第３実施形態について説明するが、第１および第２実施形態と同一構成部位には同一符号を付けて、その説明を省略する。 [Third embodiment]
Next, the third embodiment will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted.

図１０に示すように、第３実施形態による湾曲プレス部品６１は、前記第１実施形態による湾曲プレス部品１と同一形状をしている。即ち、天面部３、側壁部５およびフランジ部７から断面ハット状に形成されている。また、天面部３の幅方向端縁３ａは、長手方向Ｌに沿って、側面視で上側ＵＰＲに凸の弧状に湾曲して形成されている。   As shown in FIG. 10, the curved press part 61 according to the third embodiment has the same shape as the curved press part 1 according to the first embodiment. That is, the top surface portion 3, the side wall portion 5, and the flange portion 7 are formed in a cross-sectional hat shape. Further, the width direction edge 3a of the top surface portion 3 is formed along the longitudinal direction L so as to be curved in an arc shape convex to the upper UPR in a side view.

本実施形態によるプレス部品の成形方法は、第１および第２実施形態と同様に、予備成形工程、本成形工程、およびフランジ部平坦化工程を有する。   As in the first and second embodiments, the method for forming a pressed part according to the present embodiment includes a preforming step, a main forming step, and a flange portion flattening step.

予備成形工程は、図１１（ａ）（ｂ）に示すように、平板状のブランク材（不図示）の幅方向端部の両側に長手方向に沿って延在する高剛性部９Ｂである三角ビード６３，６３（ビード）を成形する工程である。具体的には、平板状のブランク材の幅方向端部の両側を上側（表面側）に向けて突出させることにより、ブランク材６２のように上側に突出する断面へ字状のビード６３，６３を成形する。また、予備成形工程でのシワ発生を防ぐため、ビード６３，６３は直線状に形成することが好ましい。   As shown in FIGS. 11 (a) and 11 (b), the pre-forming step is a triangle which is a high-rigidity portion 9B extending along the longitudinal direction on both sides of the widthwise end of a flat blank (not shown). This is a process of forming the beads 63, 63 (beads). Specifically, by projecting both sides of the end portion in the width direction of the flat blank material toward the upper side (surface side), the beads 63 and 63 having a cross-sectional shape projecting upward like the blank material 62. Is molded. Moreover, in order to prevent wrinkles in the preforming process, it is preferable to form the beads 63, 63 in a straight line.

本成形工程およびフランジ部平坦化工程は、第１および第２実施形態と同様である。なお、本成形工程とフランジ部平坦化工程は、前述した第１、第２実施形態と同様にブランク材が加熱された状態のもとに熱間プレスにて行う。   The main forming step and the flange portion flattening step are the same as those in the first and second embodiments. The main forming step and the flange portion flattening step are performed by hot pressing in a state where the blank material is heated as in the first and second embodiments described above.

本実施形態における作用効果は、第１および第２実施形態と同様である。   The effect in this embodiment is the same as that of 1st and 2nd embodiment.

特に、ブランク材６２の幅方向端部に、三角ビード６３，６３を形成して剛性を向上させたため、簡単な構造の高剛性部９Ｂによってフランジ部７におけるシワやシワ重なりの発生を効果的に抑制することができる。   In particular, since the triangular beads 63, 63 are formed at the end in the width direction of the blank 62 to improve the rigidity, wrinkles and wrinkles overlap in the flange portion 7 are effectively generated by the high-rigidity portion 9B having a simple structure. Can be suppressed.

[第４実施形態]
次いで、第４実施形態について説明するが、第１〜第３実施形態と同一構成部位には同一符号を付けて、その説明を省略する。 [Fourth embodiment]
Next, the fourth embodiment will be described, but the same components as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.

第４実施形態による湾曲プレス部品７１は、第２実施形態による湾曲プレス部品５１と同一形状をしている。即ち、図１２（ａ）に示すように、天面部５３、側壁部５５およびフランジ部５７から断面ハット状に形成されている。また、フランジ部５７のうち、湾曲内側のフランジ部を５７ａ、湾曲外側のフランジ部を５７ｂで示す。天面部５３における湾曲内側の幅方向端縁５３ａおよび湾曲外側の幅方向端縁５３ｂが、長手方向Ｌに沿って、平面視で弧状に湾曲して形成されている。   The curved press part 71 according to the fourth embodiment has the same shape as the curved press part 51 according to the second embodiment. That is, as shown to Fig.12 (a), it forms from the top | upper surface part 53, the side wall part 55, and the flange part 57 in the cross-sectional hat shape. Of the flange portions 57, the inner flange portion is indicated by 57a, and the outer flange portion is indicated by 57b. An inner width direction edge 53a and an outer width direction edge 53b of the top surface portion 53 are formed along the longitudinal direction L so as to be curved in an arc shape in plan view.

本実施形態によるプレス部品の成形方法は、第１〜第３実施形態と同様に、予備成形工程、本成形工程、およびフランジ部平坦化工程を有する。   The press part molding method according to the present embodiment includes a preforming step, a main molding step, and a flange portion flattening step, as in the first to third embodiments.

予備成形工程は、図１３（ａ）（ｂ）に示すように、平板状のブランク材（不図示）の幅方向端部の片側に長手方向Ｌに沿って延在する高剛性部９Ｃである三角ビード７３（ビード）を成形する工程である。具体的には、平板状のブランク材の幅方向端部の片側を上側（表面側）に向けて突出させることにより、ブランク材７２のように上側ＵＰＲに突出する断面へ字状のビード７３を成形する。また、三角ビード７３は、湾曲プレス部品７１における平面視で湾曲外側の部位に設ける。また、予備成形工程でのシワ発生を防ぐため、ビード７３は直線状に形成することが好ましい。   As shown in FIGS. 13 (a) and 13 (b), the preforming step is a high-rigidity portion 9C extending along the longitudinal direction L on one side of the end portion in the width direction of a flat blank (not shown). This is a step of forming a triangular bead 73 (bead). Specifically, by projecting one side of the end portion in the width direction of the flat blank material toward the upper side (surface side), a cross-shaped bead 73 projecting into the upper UPR like the blank material 72 is formed. Mold. Further, the triangular bead 73 is provided at a portion outside the curve in the plan view of the curved press part 71. Further, in order to prevent wrinkling in the preforming process, it is preferable to form the beads 73 in a straight line.

本成形工程およびフランジ部平坦化工程は、第１〜第３実施形態と同様である。なお、本成形工程とフランジ部平坦化工程は、前述した第１〜第３実施形態と同様にブランク材が加熱された状態のもとに熱間プレスにて行う。   The main forming step and the flange portion flattening step are the same as those in the first to third embodiments. The main forming step and the flange portion flattening step are performed by hot pressing in a state where the blank material is heated as in the first to third embodiments described above.

本実施形態における作用効果は、第１〜第３実施形態と同様である。   The effect in this embodiment is the same as that of 1st-3rd embodiment.

特に、ブランク材７２の幅方向端部に三角ビード７３を形成して剛性を向上させたため、簡単な構造の高剛性部９Ｃによって湾曲外側におけるフランジ部５７ｂのシワやシワ重なりの発生を効果的に抑制することができる。   In particular, since the triangular beads 73 are formed at the width direction end portion of the blank material 72 to improve the rigidity, the high rigidity portion 9C having a simple structure effectively causes the flange portion 57b to be wrinkled or overlapped on the outer side of the curve. Can be suppressed.

[他の実施形態]
次に、本発明の他の実施形態について、センターピラーを例にとって、成形工程を順を追って説明する。 [Other embodiments]
Next, another embodiment of the present invention will be described step by step by taking the center pillar as an example.

まず、平板状のブランク材９０は、図１４に示すように長尺状に延びる平板の鋼板であり、長手方向の中央部９３が幅広に形成されている。   First, the flat blank 90 is a flat steel plate extending in a long shape as shown in FIG. 14, and a central portion 93 in the longitudinal direction is formed wide.

次に、予備成形工程では、平板状のブランク材９０の長手方向の中央部９３における幅方向端部の両側を上側（表面側）に向けて斜めに折り曲げることによって折曲部９５（高剛性部９Ｄ）を成形し、図１５のブランク材９１となる。   Next, in the preforming step, the bent portion 95 (high-rigidity portion) is formed by obliquely bending both sides of the end portion in the width direction of the center portion 93 in the longitudinal direction of the flat blank 90 toward the upper side (surface side). 9D) is formed into the blank material 91 of FIG.

そして、加熱したブランク材９１を、図１６に示すように本成形工程において、折曲部９５を残した状態で天面部９６と側壁部９７を成形したのち、フランジ部平坦化工程において、前記折曲部９５を押し潰してフランジ部９８を平坦に成形する。その後に急冷させて高強度化し、本実施形態によるセンターピラー９９が完成する。なお、本成形工程とフランジ部平坦化工程は、前述した第１〜第４実施形態と同様にブランク材が加熱された状態のもとに熱間プレスにて行う。   Then, after forming the top surface portion 96 and the side wall portion 97 in a state where the bent portion 95 is left in the main forming step as shown in FIG. 16, the heated blank material 91 is formed in the flange portion flattening step. The bent portion 95 is crushed to form the flange portion 98 flat. Thereafter, the center pillar 99 according to the present embodiment is completed by rapidly cooling to increase the strength. The main forming step and the flange portion flattening step are performed by hot pressing in a state where the blank material is heated as in the first to fourth embodiments described above.

このように、本実施形態では、ブランク材９１における長手方向の一部に高剛性部９Ｄを形成した場合でも、フランジ部９８のシワやシワ重なりの発生を効果的に抑制することができる。   Thus, in this embodiment, even when the high-rigidity portion 9D is formed in a part of the blank material 91 in the longitudinal direction, the occurrence of wrinkles and wrinkle overlap of the flange portion 98 can be effectively suppressed.

以上、本発明を、第１〜第４実施形態および他の実施形態で説明したが、本発明はこれらに限定されず、種々の変形および変更が可能である。   As mentioned above, although this invention was demonstrated in 1st-4th embodiment and other embodiment, this invention is not limited to these, A various deformation | transformation and change are possible.

例えば、第１および第４実施形態並びに他の実施形態において、折曲部を上側（表面側）に向けて斜めに延在させたが、下側（裏面側）に向けて延在させても良い。   For example, in the first and fourth embodiments and other embodiments, the bent portion is extended obliquely toward the upper side (front side), but may be extended toward the lower side (back side). good.

また、ビードについても、三角ビード以外にも適用が可能である。ただし、フランジ部平坦化工程においてビードを押し潰す際にビード同士が重ならないためには、三角ビード等のように稜線を有する形状のビードが好ましい。   Also, the beads can be applied to other than triangular beads. However, in order to prevent the beads from overlapping when the beads are crushed in the flange portion flattening step, a bead having a ridge line such as a triangular bead is preferable.

さらに、前述した実施形態では、高剛性部９〜９Ｃを押し潰して平坦化させたが、高剛性部９〜９Ｃを残したまま製品としても良い。   Furthermore, in the above-described embodiment, the high-rigidity portions 9 to 9C are crushed and flattened. However, the high-rigidity portions 9 to 9C may be left as products.

また、本発明によるプレス成形は、ブランク材の加熱や成形後の急冷を必要としない冷間プレスでも良い。   The press molding according to the present invention may be a cold press that does not require heating of the blank material or rapid cooling after molding.

１，５１，６１，７１…湾曲プレス部品
２，５２，６２，７２，９１…ブランク材
３，５３，９６…天面部
３ａ，５３ａ，５３ｂ…幅方向端縁
５，５５，９７…側壁部
５ａ…端縁
７，５７，９８…フランジ部
９〜９Ｃ…高剛性部
１１，５８，９５…折曲部（高剛性部）
６３，７３…三角ビード（ビード、高剛性部） DESCRIPTION OF SYMBOLS 1,51,61,71 ... Curve press part 2,52,62,72,91 ... Blank material 3,53,96 ... Top surface part 3a, 53a, 53b ... Width direction edge 5,55,97 ... Side wall part 5a ... End edge 7,57,98 ... Flange part 9-9C ... High rigidity part 11,58,95 ... Bent part (high rigidity part)
63, 73 ... Triangular bead (bead, high rigidity part)

Claims (3)

天面部と、該天面部の幅方向端縁から前記天面部に対して交差する方向に屈曲して延在する側壁部と、該側壁部の端縁から屈曲して延在するフランジ部と、から断面ハット状に形成されると共に、前記天面部の幅方向端縁が長手方向に沿って湾曲して延在する形状の湾曲プレス部品をプレス成形するプレス部品の成形方法であって、
平板状のブランク材の幅方向の片側の端部若しくは両側の端部のみに長手方向に沿って延在する高剛性部を成形する予備成形工程と、
前記高剛性部を残した状態で前記平板状のブランク材の平板のままの本体部を成形して前記天面部と側壁部を形成する本成形工程と、
前記高剛性部を押し潰して前記フランジ部を平坦に成形するフランジ部平坦化工程と、
を有することを特徴とするプレス部品の成形方法。 A top surface portion, a side wall portion that extends and bends in a direction intersecting the top surface portion from a width direction edge of the top surface portion, and a flange portion that bends and extends from an end edge of the side wall portion; A forming method of a press part that is formed into a cross-sectional hat shape and presses a curved press part having a shape in which a width direction edge of the top surface part is curved and extends along a longitudinal direction,
A preforming step of forming a high-rigidity portion extending along the longitudinal direction only at one end or both end portions in the width direction of the flat blank material;
A main forming step of forming the main body portion as the flat plate of the flat blank material while forming the high rigidity portion, and forming the top surface portion and the side wall portion,
Flange part flattening step of crushing the high-rigidity part and forming the flange part flatly,
A method for forming a pressed part, comprising: 前記高剛性部は、ブランク材の表面側もしくは裏面側に向けて突出するビード、または、ブランク材の幅方向端部を表面側もしくは裏面側に向けて斜めに折り曲げた折曲部であることを特徴とする請求項１に記載のプレス部品の成形方法。   The high-rigidity portion is a bead that protrudes toward the front surface side or the back surface side of the blank material, or a bent portion that is bent obliquely toward the front surface side or the back surface side of the width direction end portion of the blank material. The method for forming a pressed part according to claim 1, wherein: 前記本成形工程を熱間プレスにて行うことを特徴とする請求項１または２に記載のプレス部品の成形方法。 The method for forming a pressed part according to claim 1, wherein the main forming step is performed by hot pressing .
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