JP2010005651A - Die for press forming of metallic member of hat-shaped section, and press forming method thereof - Google Patents

Die for press forming of metallic member of hat-shaped section, and press forming method thereof Download PDF

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JP2010005651A
JP2010005651A JP2008167008A JP2008167008A JP2010005651A JP 2010005651 A JP2010005651 A JP 2010005651A JP 2008167008 A JP2008167008 A JP 2008167008A JP 2008167008 A JP2008167008 A JP 2008167008A JP 2010005651 A JP2010005651 A JP 2010005651A
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vertical wall
press
die
cross
hat
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JP5079604B2 (en
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Seiichi Daimaru
成一 大丸
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Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a die for press forming of a metallic member of a hat-shaped section, and to provide a press forming method thereof. <P>SOLUTION: The die for press forming comprises a punch and a die having a ceiling part and a longitudinal wall part, and a bent part in the plane in the longitudinal direction. The punch and the die have a tapered step on one of the longitudinal wall parts to form an upper longitudinal wall part and a lower longitudinal wall part. A metallic member of a hat-shaped section having the high dimensional accuracy and the shape consistency can be obtained by executing the press forming on a ridge part formed by the step and the lower longitudinal wall part in an area including the bent part or in an area including an area where the tensile stress is generated during the press forming in the metallic member of the hat-shaped section by using the die for press forming having a fillet part with its peripheral length of the section being shorter than the periphery. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、例えば、自動車車体の部材等に用いられる断面ハット型形状部材をプレス成形するための、長手方向の平面内で屈曲部を有するプレス成形用金型およびプレス成形方法に関し、特に、プレス成形時に該断面ハット型形状部材に発生する引張応力の緩和を図り、また、スプリングバック発生防止を図る等により、３次元形状の寸法精度および形状安定性を向上させた断面ハット型形状部材を得るためのプレス成形用金型およびプレス成形方法に関するものである。   The present invention relates to a press-molding die having a bent portion in a longitudinal plane and a press-molding method for press-molding, for example, a cross-sectional hat-shaped member used for a member of an automobile body. A cross-sectional hat-shaped member having improved dimensional accuracy and shape stability of a three-dimensional shape is obtained by reducing the tensile stress generated in the cross-sectional hat-shaped member during molding and preventing the occurrence of springback. The present invention relates to a press molding die and a press molding method.

近年、自動車用車体の構造用部材として、天井部、縦壁部およびフランジ部を備えた断面ハット型形状部材が多く用いられているが、この断面ハット型形状部材の成形は、パンチ及びダイを用いたフォーム成形（図９）、あるいは更に、板押さえを用いたドロー成形（図１０）等のプレス成形により行われるのが一般的である。しかし、プレス成形により成形した断面ハット型形状部材は、離型後の弾性回復挙動によって、スプリングバック、反り、ねじれ等を発生しやすく、これが原因で寸法精度が低下し、形状安定性を欠くという問題点があった。   In recent years, a cross-sectional hat-shaped member having a ceiling portion, a vertical wall portion, and a flange portion has been widely used as a structural member of a car body for automobiles. It is generally performed by press molding such as foam molding (FIG. 9) used, or draw molding (FIG. 10) using a plate press. However, the cross-sectional hat-shaped member formed by press molding is likely to generate springback, warpage, twisting, etc. due to the elastic recovery behavior after release, which causes a decrease in dimensional accuracy and lacks shape stability. There was a problem.

そこで、このような問題点を解決するために、種々の方策が検討されており、例えば、図１に示されるように、プレス成形した断面ハット型形状部材の縦壁部とフランジ部が交差する角部に、部材長手方向に間欠的に、縦壁部およびフランジ部の両者に接するようにビード部を形成することが知られており、この角部へのビード部形成によって、スプリングバック、口開き、反りの発生を抑え、寸法精度の向上を図ることが特許文献１に開示されている。   In order to solve such problems, various measures have been studied. For example, as shown in FIG. 1, the vertical wall portion and the flange portion of the press-shaped cross-sectional hat-shaped member intersect each other. It is known that a bead portion is formed in a corner portion so as to be in contact with both the vertical wall portion and the flange portion intermittently in the longitudinal direction of the member. Patent Document 1 discloses that opening and warping are suppressed and dimensional accuracy is improved.

また、図２に示されるように、パンチ及びダイを有し、パンチ及びダイの壁部には、フランジ部に向かって末広がり状の段差を有するプレス成形用金型を用いて成形することにより、天井部、縦壁部およびフランジ部を有し、該縦壁部にはフランジ部に向かって末広がり状の段差を備え、かつ、長手方向に屈曲部を有する断面ハット型形状部材を得ることが知られており、そして、該断面ハット型形状部材においては、縦壁部にフランジ部に向かって末広がり状の段差を形成することによって、口開き・反り・ねじれの発生が防止され、良好な寸法精度を確保できることが特許文献２に開示されている。   In addition, as shown in FIG. 2, the punch and the die have a wall portion of the punch and die formed by using a press-molding die having a divergent step toward the flange portion, It is known to have a cross-sectional hat-shaped member having a ceiling part, a vertical wall part, and a flange part, the vertical wall part having a stepped shape toward the flange part and having a bent part in the longitudinal direction. In addition, in the hat-shaped member having a cross-sectional shape, by forming a stepped shape in the vertical wall portion toward the flange portion, the occurrence of mouth opening, warping, and twisting is prevented, and good dimensional accuracy is achieved. It is disclosed in Patent Document 2 that the above can be secured.

さらに、図３に示されるように、天井部、縦壁部およびフランジ部を有し、該縦壁部にはフランジ部に向かって末広がり状の段差を備え、かつ、長手方向に屈曲部を有する断面ハット型形状部材において、断面ハット型形状部材の縦壁部とフランジ部が交差する角部に、部材長手方向に間欠的に、縦壁部およびフランジ部の双方に接すると同時に、縦壁部の高さ方向に延びるようにビード部を形成することによって、寸法精度を向上させるとともに長手方向の圧壊強度を向上させることが特許文献３に開示されている。   Further, as shown in FIG. 3, the ceiling portion, the vertical wall portion, and the flange portion are provided, the vertical wall portion has a stepped shape toward the flange portion, and has a bent portion in the longitudinal direction. In the cross-sectional hat-shaped member, the vertical wall portion is in contact with both the vertical wall portion and the flange portion intermittently in the longitudinal direction of the member at the corner portion where the vertical wall portion and the flange portion of the cross-sectional hat shape member intersect. Patent Document 3 discloses that the bead portion is formed so as to extend in the height direction, thereby improving the dimensional accuracy and improving the crushing strength in the longitudinal direction.

しかし、図１、図３に示された縦壁部とフランジ部が交差する角部にビード部を形成した断面ハット型形状部材では、該部材に屈曲部が存在しないような場合にはある程度の寸法精度を維持できるにしても、その長手方向に屈曲部を有する断面ハット型形状部材にあっては、離型後の弾性回復挙動によるスプリングバック、反り、ねじれ等の発生により、所望の寸法精度を確保することは困難であり、また、所定位置に所定寸法のビード部をプレス成形と同時に形成することは非常に困難であった。   However, in the cross-sectional hat-shaped member in which the bead portion is formed at the corner portion where the vertical wall portion and the flange portion intersect as shown in FIGS. 1 and 3, there is a certain degree when the bent portion does not exist in the member. Even if the dimensional accuracy can be maintained, in the case of a cross-sectional hat-shaped member having a bent portion in its longitudinal direction, the desired dimensional accuracy is obtained due to the occurrence of springback, warpage, torsion, etc. due to the elastic recovery behavior after release. It has been difficult to secure a bead portion having a predetermined size at a predetermined position at the same time as press molding.

また、図２に示されたものについても、前記プレス成形用金型を用いて、長手方向に屈曲部を有する断面ハット型形状部材を成形した場合には、一定程度、口開き・反り・ねじれ等の発生は防止し得るが、特に、部材屈曲部近傍においては十分な寸法精度を確保することができなかった。
特開２０００−２１９１６２号公報 特開２００４−３１４１２３号公報 特開２００５−１０３６１３号公報 In addition, with respect to the one shown in FIG. 2, when a cross-sectional hat-shaped member having a bent portion in the longitudinal direction is molded using the press molding die, a certain degree of opening, warping, and twisting is performed. Although generation | occurrence | production etc. can be prevented, sufficient dimensional accuracy was not securable especially in the member bending part vicinity.
JP 2000-219162 A JP 2004-314123 A JP-A-2005-103613

本発明は上記課題に鑑み、特に自動車の車体の部材に用いられる断面ハット型形状部材について、３次元形状の寸法精度および形状安定性を向上させることができるプレス成形用金型を提供することを目的とし、さらには、このプレス成形用金型を用いたプレス成形方法を提供することを目的とする。   In view of the above problems, the present invention provides a press molding die that can improve the dimensional accuracy and shape stability of a three-dimensional shape, particularly with respect to a cross-sectional hat-shaped member used for a member of a car body of an automobile. It is another object of the present invention to provide a press molding method using this press molding die.

本発明者らは、上記課題を解決するため、特に、長手方向に屈曲部を有し、さらに、縦壁部にはフランジ面に向かって末広がり状の段差を有する断面ハット型形状部材をプレス成形する際の、プレス成形用金型の形状およびプレス成形方法について、鋭意研究した結果、以下の知見を得た。   In order to solve the above-mentioned problems, the inventors of the present invention particularly press-molded a cross-sectional hat-shaped member having a bent portion in the longitudinal direction and a vertical wall portion having a stepped shape toward the flange surface. As a result of intensive studies on the shape of the press molding die and the press molding method, the following knowledge was obtained.

通常は、例えば、図５に斜視図で示されるような形状、屈曲部を有するパンチ及びダイからなるプレス成形用金型を使用して、所定成形荷重でプレス成形することにより、長手方向に屈曲部を有し、さらに、縦壁部の一方は、上部縦壁部と下部縦壁部とを備え、さらに、上部縦壁部と下部縦壁部との間には末広がり状の段差が形成された断面ハット型形状部材を得ることができるが、この断面ハット型形状部材について、部材屈曲部の稜線部及び角部の引張応力を計算し、スプリングバック（Ｓ／Ｂ）量を求めたところ、Ｓ／Ｂ量は７．１４（ｍｍ）であった。
つまり、通常のパンチおよびダイを用いたプレスで上記の断面ハット型形状部材を成形した場合には、大きなスプリングバック、捩れが発生するため、寸法精度、形状安定性が非常に劣るものであるといえる。 Usually, for example, the shape shown in the perspective view in FIG. 5 is bent in the longitudinal direction by press-molding with a predetermined molding load using a press-molding die consisting of a punch and die having a bent portion. In addition, one of the vertical wall portions is provided with an upper vertical wall portion and a lower vertical wall portion, and a divergent step is formed between the upper vertical wall portion and the lower vertical wall portion. The cross-sectional hat-shaped member can be obtained, but for this cross-sectional hat-shaped member, the tensile stress of the ridge line portion and the corner portion of the member bending portion is calculated, and the springback (S / B) amount is obtained. The S / B amount was 7.14 (mm).
In other words, when the above-mentioned hat-shaped member having a cross-section is formed by a press using a normal punch and die, large springback and twisting occur, so that dimensional accuracy and shape stability are very poor. I can say that.

そこで、本発明では、例えば、図６に斜視図で示されるパンチ及びダイ、即ち、上記の通常のパンチ及びダイと同一寸法・形状であるが、これに加えてさらに、屈曲部を含む領域で、段差と下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を２個有するパンチ及びダイからなるプレス成形用金型を用いて、所定成形荷重でプレス成形したところ、断面ハット型形状部材には、前記パンチ、ダイに設けた前記フィレット部に対応する箇所（即ち、断面ハット型形状部材の屈曲部を含む領域で、段差と下部縦壁部が形成する稜線部）にフィレット部が形成された。
そして、本発明のプレス成形用金型を用いて成形した上記フィレット部を有する断面ハット型形状部材について、部材屈曲部の稜線部の引張応力を計算し、スプリングバック（Ｓ／Ｂ）量を求めたところ、Ｓ／Ｂ量は６．５４（ｍｍ）であり、引張応力によるスプリングバック発生は極めて小さいものとなり（前記通常のパンチ及びダイにより成形した断面ハット型形状部材では、Ｓ／Ｂ量は７．１４（ｍｍ））、また、捩れの発生もなく、３次元形状の寸法精度および形状安定性は非常に優れたものであることを確認した。 Therefore, in the present invention, for example, the punch and die shown in a perspective view in FIG. 6, that is, the same size and shape as the above-described normal punch and die, but in addition to this, in a region including a bent portion. In the ridgeline portion formed by the step and the lower vertical wall portion, when press-molding with a predetermined molding load using a press-molding die comprising a punch and a die having two fillet portions whose cross-sectional circumference is shorter than the surroundings, The cross-sectional hat-shaped member includes a portion corresponding to the fillet portion provided on the punch and die (that is, a ridge line portion formed by a step and a lower vertical wall portion in a region including a bent portion of the cross-sectional hat-shaped member) A fillet portion was formed.
And about the cross-sectional hat-shaped member which has the said fillet part shape | molded using the metal mold | die for press molding of this invention, the tensile stress of the ridgeline part of a member bending part is calculated, and springback (S / B) amount is calculated | required. As a result, the S / B amount is 6.54 (mm), and the occurrence of springback due to tensile stress is extremely small (in the cross-sectional hat-shaped member formed by the normal punch and die, the S / B amount is 7.14 (mm)), and there was no occurrence of twisting, and it was confirmed that the dimensional accuracy and shape stability of the three-dimensional shape were very excellent.

さらに、図７、図８に斜視図で示すように、パンチ、ダイに形成するフィレット部の数、位置を変更し、これらのプレス成形用金型を用いてプレス成形した断面ハット型形状部材のスプリングバック（Ｓ／Ｂ）量をされたそれぞれ求めたところ、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域に対応した箇所で、かつ、パンチ、ダイの段差と下部縦壁部が形成する稜線部にフィレット部を設ける（図７）と、あるいは、パンチ、ダイの屈曲部の領域内の前記稜線部のみにフィレット部を設ける(図８)と、いずれの場合もスプリングバック（Ｓ／Ｂ）量は減少し、捩れ発生も抑制され、その結果、３次元形状の寸法精度および形状安定性が向上することが確認された。   Further, as shown in perspective views in FIGS. 7 and 8, the number and position of the fillet portions formed on the punch and die are changed, and the cross-sectional hat-shaped member press-molded using these press-molding dies is used. When the springback (S / B) amount was obtained, the metal cross-sectional hat-shaped member corresponds to the region including the region where tensile stress is generated during press molding, and the step of the punch and die. And a fillet portion provided in the ridge line portion formed by the lower vertical wall portion (FIG. 7), or a fillet portion provided only in the ridge line portion in the region of the bent portion of the punch and die (FIG. 8), In this case as well, the amount of springback (S / B) was reduced, and the occurrence of twisting was suppressed. As a result, it was confirmed that the dimensional accuracy and shape stability of the three-dimensional shape were improved.

以上のとおり、本発明に係る金属製断面ハット型形状部材のプレス成形用金型およびこのプレス成形用金型を用いたプレス成形方法によれば、天井部、上部縦壁部、段差、下部縦壁部、フランジ部を備え、長手方向に屈曲部を有する金属製断面ハット型形状部材において、特に、段差と下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を形成することができ、そして、このようなフィレット部が形成されていることによって、前記金属製断面ハット型形状部材は、スプリングバック発生、捩れの発生が抑制され、その結果として、長手方向の圧壊強度に優れるばかりか、３次元形状の寸法精度および形状安定性の向上が図られる。   As described above, according to the press-molding die of the metal cross-section hat-shaped member and the press-molding method using the press-molding die according to the present invention, the ceiling portion, the upper vertical wall portion, the step, the lower vertical portion In a metal cross-section hat-shaped member that has a wall and a flange, and that has a bent portion in the longitudinal direction, a fillet with a shorter cross-sectional circumference than the surroundings is formed especially on the ridge line formed by the step and the lower vertical wall By forming such a fillet portion, the metal cross-sectional hat-shaped member can suppress the occurrence of springback and torsion, and as a result, the crushing strength in the longitudinal direction can be reduced. In addition, the dimensional accuracy and shape stability of the three-dimensional shape can be improved.

本発明は、上記知見に基づいてなされたものであって、
「（１） 天井部および縦壁部を有し、長手方向の平面内で屈曲部を有するパンチ及びダイからなるプレス成形用金型であって、前記パンチ及びダイは、前記縦壁部の一方に末広がり状の段差を有し、上部縦壁部と下部縦壁部を形成し、前記屈曲部を含む領域で、前記段差と前記下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を１個又は複数個有することを特徴とする金属製断面ハット型形状部材のプレス成形用金型。
（２） 天井部および縦壁部を有し、長手方向の平面内で屈曲部を有するパンチ及びダイからなるプレス成形用金型であって、前記パンチ及びダイは、前記縦壁部の一方に末広がり状の段差を有し、上部縦壁部と下部縦壁部を形成し、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域で、前記段差と前記下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を１個又は複数個有することを特徴とする金属製断面ハット型形状部材のプレス成形用金型。
（３） 前記フィレット部は、前記屈曲部の領域内の前記稜線部のみに形成されていることを特徴とする前記（１）記載の金属製断面ハット型形状部材のプレス成形用金型。
（４） 更に、板押さえを有することを特徴とする前記（１）〜（３）の何れかに記載の金属製断面ハット型形状部材のプレス成形用金型。
（５） 前記（１）〜（４）の何れかに記載のプレス成形用金型を用いて金属板をプレス成形し、前記パンチの下死点にて前記フィレット部を形成してプレス成形を終了した後、前記フィレット部を含まないように前記金属板を切断して、フランジ部を形成し、天井部、縦壁部及び前記フランジ部からなる金属製断面ハット型形状部材とすることを特徴とする金属製断面ハット型形状部材のプレス成形方法。」
に特徴を有するものである。 The present invention has been made based on the above findings,
“(1) A press-molding die comprising a punch and a die having a ceiling part and a vertical wall part and having a bent part in a plane in the longitudinal direction, the punch and die being one of the vertical wall parts The upper and lower vertical wall portions are formed, and in the region including the bent portion, the ridgeline portion formed by the step and the lower vertical wall portion has a cross-sectional circumference. A metal mold for press-molding a metal cross-section hat-shaped member, having one or a plurality of shorter fillet portions.
(2) A press-molding die comprising a punch and a die having a ceiling part and a vertical wall part and having a bent part in a plane in the longitudinal direction, wherein the punch and the die are on one of the vertical wall parts A region having a divergent step, forming an upper vertical wall portion and a lower vertical wall portion, and including a region where tensile stress is generated during press forming on a metal cross-sectional hat-shaped member, and the step and the lower vertical wall portion A metal mold for press-molding a metal cross-sectional hat-shaped member, having one or a plurality of fillet portions whose cross-sectional circumference is shorter than that of the surroundings on a ridge line portion formed by a wall portion.
(3) The metal mold for press-molding a metal cross-section hat-shaped member according to (1), wherein the fillet portion is formed only in the ridge line portion in the region of the bent portion.
(4) The metal mold for press-molding a metal cross-section hat-shaped member according to any one of (1) to (3), further comprising a plate presser.
(5) A metal plate is press-molded using the press-molding die according to any one of (1) to (4), and the fillet portion is formed at the bottom dead center of the punch. After finishing, the metal plate is cut so as not to include the fillet portion, a flange portion is formed, and a metal cross-sectional hat-shaped member including a ceiling portion, a vertical wall portion and the flange portion is formed. A press-forming method of a metal cross-section hat-shaped member. "
It has the characteristics.

本発明によれば、天井部および縦壁部を有し、長手方向の平面内で屈曲部を有するパンチ及びダイからなるプレス成形用金型であって、前記パンチ及びダイは、前記縦壁部の一方に末広がり状の段差を有し、上部縦壁部と下部縦壁部を形成し、前記屈曲部を含む領域で、あるいは、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域で、前記段差と前記下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を１個又は複数個有するプレス成形用金型を用いて、金属製断面ハット型形状部材をプレス成形することにより、長手方向に屈曲部を有する断面ハット型形状部材の圧壊強度、３次元形状の寸法精度および形状安定性を向上することが可能となる。   According to the present invention, there is provided a press molding die comprising a punch and a die having a ceiling portion and a vertical wall portion and having a bent portion in a longitudinal plane, wherein the punch and die are the vertical wall portion. One of the two has a divergent step, forms an upper vertical wall and a lower vertical wall, and generates tensile stress during press forming in the area including the bent portion or in a metal cross-section hat-shaped member In a region including a region to be used, a metal cross section is formed by using a press molding die having one or a plurality of fillet portions whose cross section circumferential length is shorter than the surrounding at the ridge line portion formed by the step and the lower vertical wall portion. By press-molding the hat-shaped member, it is possible to improve the crushing strength of the cross-sectional hat-shaped member having a bent portion in the longitudinal direction, the dimensional accuracy of the three-dimensional shape, and the shape stability.

フィレット部を含む切断縦断面拡大図を図４として示すように、本発明の金属製断面ハット型形状部材のプレス成形用金型は、天井部７、縦壁部８、一方の該縦壁部８に形成された末広がり状の段差部１１、該段差部１１によって区分けされる上部縦壁部９と下部縦壁部１０、前記段差部１１と前記下部縦壁部１０が形成する稜線部に形成された断面周長が周囲より短いフィレット部６を備え、また、図６〜８に示すように、パンチ及びダイは、その長手方向の平面内で屈曲部を有している。   As shown in FIG. 4 which is an enlarged view of a cut vertical section including a fillet portion, the metal mold for press forming of the metal cross section hat-shaped member of the present invention has a ceiling portion 7, a vertical wall portion 8, one of the vertical wall portions. 8 is formed on the ridgeline portion formed by the stepped portion 11 and the lower vertical wall portion 10, the upper vertical wall portion 9 and the lower vertical wall portion 10 that are divided by the stepped portion 11. The cross-section circumferential length is provided with a fillet portion 6 shorter than the surrounding, and as shown in FIGS. 6 to 8, the punch and the die have a bent portion in the plane in the longitudinal direction.

金属製断面ハット型形状部材のプレス成形を行う際の、パンチ、ダイの動作を、図４（ａ）〜（ｃ）により説明する。   The operations of the punch and die when the metal cross-section hat-shaped member is press-formed will be described with reference to FIGS.

図４において、１は成形される鋼板、２はパンチ、３はダイを示し、パンチ２には、段差部と下部縦壁部が形成する稜線部にフィレット部に対応した形状の凹部４が、また、ダイ３には、同じくフィレット部に対応した形状の凸部５が形成されている。
尚、本発明において、凹部とは、例えば図４（ａ）に示すように、周囲に比べて周長が短くなるように、周囲より相対的に窪んでいる部分を言う。
また、同様に、凸部とは、周囲に比べて周長が短くなるように、周囲より相対的に盛り上がっている部分を言う。
図４（ａ）は、パンチ２、ダイ３により鋼板１を挟持し、断面ハット型形状に成形する成形初期段階を示す。
図４（ｂ）は成形途中段階を示し、フィレット部以外の領域は、パンチ２、ダイ３により鋼板１がほぼ最終形状に近い断面ハット型形状に成形されているが、フィレット部が形成される箇所では、パンチ２の凹部４と、ダイ３の凸部５は当接していない（間隔ｓだけ離間している）ため、フィレット部の成形は未だ行われていない。
図４（ｃ）は成形終了段階を示し、下死点において、パンチ２の凹部４と、ダイ３の凸部５が当接することにより断面周長が周囲より短いフィレット部６が稜線部に形成され、また、フィレット部６以外の領域ではパンチ２とダイ３が当接することにより、フィレット部６においては引張応力が圧縮方向に緩和されて最終所定形状に成形される。
このようにして、段差部と下部縦壁部が形成する稜線部にフィレット部が形成され、天井部、縦壁部（一方は、上部縦壁部、下部縦壁部、段差部を備える）およびフランジ部を備え、さらに、長手方向に屈曲部を有する断面ハット型形状部材が成形される。 In FIG. 4, 1 is a steel plate to be formed, 2 is a punch, 3 is a die, and the punch 2 has a concave portion 4 having a shape corresponding to a fillet portion on a ridge line portion formed by a step portion and a lower vertical wall portion. The die 3 is also provided with a convex portion 5 having a shape corresponding to the fillet portion.
In addition, in this invention, a recessed part means the part relatively depressed from the periphery so that perimeter may become short compared with the periphery, for example, as shown to Fig.4 (a).
Similarly, the convex portion refers to a portion that is relatively raised from the periphery so that the circumference is shorter than the periphery.
FIG. 4A shows an initial forming stage in which the steel plate 1 is sandwiched between the punch 2 and the die 3 and formed into a hat-shaped cross section.
FIG. 4B shows a stage in the middle of forming, and in the region other than the fillet portion, the steel plate 1 is formed into a cross-sectional hat shape that is almost close to the final shape by the punch 2 and the die 3, but the fillet portion is formed. At the location, the concave portion 4 of the punch 2 and the convex portion 5 of the die 3 are not in contact (separated by an interval s), so that the fillet portion is not yet formed.
FIG. 4 (c) shows the molding end stage, and at the bottom dead center, the concave portion 4 of the punch 2 and the convex portion 5 of the die 3 come into contact with each other, so that a fillet portion 6 having a shorter section circumference than the surrounding is formed at the ridgeline portion Further, when the punch 2 and the die 3 are brought into contact with each other in the region other than the fillet portion 6, the tensile stress is relaxed in the compression direction in the fillet portion 6 to be formed into a final predetermined shape.
In this way, a fillet portion is formed at the ridge line portion formed by the step portion and the lower vertical wall portion, and the ceiling portion, the vertical wall portion (one has an upper vertical wall portion, a lower vertical wall portion, a step portion) and A cross-sectional hat-shaped member having a flange portion and having a bent portion in the longitudinal direction is formed.

図６に示すように、プレス成形用金型の長手方向の平面内で屈曲部を含む領域であって、かつ、段差と下部縦壁部が形成する稜線部にフィレット部６を設け、このようなプレス成形用金型で成形を行うと、プレス成形用金型の前記フィレット部６の位置に対応した箇所の断面ハット型形状部材の引張応力が圧縮方向に緩和され、その結果、成形された断面ハット型形状部材のスプリングバック量が小さくなる(請求項１に係る発明)。   As shown in FIG. 6, a fillet portion 6 is provided in a ridge line portion that is a region including a bent portion in a longitudinal plane of a press molding die and is formed by a step and a lower vertical wall portion. When molding is performed with a press mold, the tensile stress of the cross-sectional hat-shaped member at the location corresponding to the position of the fillet portion 6 of the press mold is relaxed in the compression direction, and as a result, the mold is molded. The springback amount of the cross-sectional hat-shaped member is reduced (the invention according to claim 1).

プレス成形によって発生する断面ハット型形状部材の引張応力は、有限要素法によるプレス成形解析計算により求めても良いし、プレス成形実験を行い、成形下死点での応力測定により決定することができるが、いずれにしても、断面ハット型形状部材の屈曲部およびその近傍は引張応力が発生していることが多い。
したがって、図７に示すように、プレス成形用金型の、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域で、前記段差と前記下部縦壁部が形成する稜線部にフィレット部６を設けておくことにより、やはり、成形された断面ハット型形状部材のスプリングバック量を小さくすることができる(請求項２に係る発明)。 The tensile stress of the cross-sectional hat-shaped member generated by press molding may be determined by press molding analysis calculation by the finite element method, or it can be determined by performing a press molding experiment and measuring stress at the bottom dead center of molding. In any case, however, tensile stress is often generated at the bent portion of the hat-shaped member in the cross section and in the vicinity thereof.
Therefore, as shown in FIG. 7, the step and the lower vertical wall portion are formed in a region including a region where tensile stress is generated in the metal cross-sectional hat-shaped member of the press molding die. By providing the fillet portion 6 at the ridge line portion, the springback amount of the molded cross-sectional hat-shaped member can be reduced (the invention according to claim 2).

更に、図８に示すように、屈曲部の領域内の稜線部のみにフィレット部６を設けると、屈曲部に引張応力が集中していることが多いため、スプリングバック量を小さくするのに非常に効果的である(請求項３に係る発明)。   Furthermore, as shown in FIG. 8, when the fillet portion 6 is provided only at the ridge line portion in the bent portion region, tensile stress is often concentrated on the bent portion, which is very useful for reducing the amount of spring back. (Invention according to claim 3).

本発明に係るパンチ２及びダイ３を備えたプレス成形用金型は、図９（ａ）〜（ｃ）に示す、いわゆるフォーム成形用の金型として用いることができるばかりか、更に板押さえ１３を用いることにより、図１０（ａ）〜（ｃ）に示す、いわゆるドロー成形用の金型として用いることもできる（請求項４に係る発明）。   The press molding die provided with the punch 2 and the die 3 according to the present invention can be used not only as a so-called foam molding die shown in FIGS. Can be used as a so-called draw mold as shown in FIGS. 10A to 10C (invention according to claim 4).

図６に示されるパンチおよびダイからなるプレス成形用金型、即ち、パンチの寸法は、表１に示すように、長手方向長さＬ：９００ｍｍ、天井部幅ＷＲ：４０ ｍｍ、縦壁部高さＨ：４０ｍｍ、上部縦壁部高さＨＵ：４０ｍｍ、下部縦壁部高さＨＬ：３０ｍｍ、段差幅ＷＳ（但し、水平投影長さ。以下も同じ）：４０ｍｍであり、長手方向に屈曲部（屈曲部の曲率半径ρ（屈曲部が形成する仮想円弧の半径）は３００ｍｍ）を有し、屈曲部を含む領域で、かつ、段差と下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部６（長手方向の長さＲＬ（長径）：７１ｍｍ、長手直角方向の長さＲＴ（短径）：２３．４ｍｍの楕円状）を２箇所に形成した本発明例１のプレス成形用金型を用い、
鋼板（引張強度：５９０ＭＰａ級、板厚：１．４ｍｍ）を成形荷重６００ｔでプレス成形し、
長さ７３０ｍｍ×天井部幅４０ｍｍ×高さ４０ｍｍ×フランジ幅２０ｍｍの寸法からなり、一方の縦壁部に段差（但し、上部縦壁部高さ：４０ｍｍ、下部縦壁部高さ：３０ｍｍ、段差幅：４０ｍｍ）を形成し、長手方向に屈曲部（屈曲部の曲率半径は３００ｍｍ）を有する金属製断面ハット型形状部材（以下、本発明部材１という）を成形した。 As shown in Table 1, the press-molding die composed of the punch and die shown in FIG. 6 has the longitudinal length L: 900 mm, the ceiling width W R : 40 mm, and the vertical wall portion. Height H: 40 mm, upper vertical wall height H U : 40 mm, lower vertical wall height H L : 30 mm, step width W S (however, horizontal projection length; the same applies below): 40 mm, longitudinal A bending portion (the radius of curvature ρ of the bending portion (the radius of the virtual arc formed by the bending portion) is 300 mm) in the direction, and the region including the bending portion and the ridge line portion formed by the step and the lower vertical wall portion , The fillet part 6 (longitudinal length R L (major axis): 71 mm, longitudinal length R T (minor axis): 23.4 mm ellipse) shorter than the circumference is formed in two places Using the press mold of Example 1 of the present invention,
A steel plate (tensile strength: 590 MPa class, plate thickness: 1.4 mm) was press-formed with a forming load of 600 t,
It consists of dimensions of length 730mm x ceiling width 40mm x height 40mm x flange width 20mm, with one vertical wall step (however, upper vertical wall height: 40mm, lower vertical wall height: 30mm, step) A metal cross-section hat-shaped member (hereinafter referred to as the present invention member 1) having a bent portion in the longitudinal direction (the radius of curvature of the bent portion is 300 mm) was formed.

比較のために、フィレット部６を形成しない以外は、本発明例１のものと同一形状、同一寸法の図５に示される通常のプレス成形用金型（以下、比較例という）を用いて、鋼板（引張強度：５９０ＭＰａ級、板厚：１．４ｍｍ）を成形荷重６００ｔでプレス成形し、
長さ７３０ｍｍ×天井部幅４０ｍｍ×高さ４０ｍｍ×フランジ幅２０ｍｍの寸法からなり、一方の縦壁部に段差（但し、上部縦壁部高さ：４０ｍｍ、下部縦壁部高さ：３０ｍｍ、段差幅：４０ｍｍ）を形成し、長手方向に屈曲部（屈曲部の曲率半径は３００ｍｍ）を有する金属製断面ハット型形状部材（以下、比較例部材という）を成形した。 For comparison, except that the fillet portion 6 is not formed, using a normal press-molding die (hereinafter referred to as a comparative example) shown in FIG. A steel plate (tensile strength: 590 MPa class, plate thickness: 1.4 mm) was press-formed with a forming load of 600 t,
It consists of dimensions of length 730mm x ceiling width 40mm x height 40mm x flange width 20mm, with one vertical wall step (however, upper vertical wall height: 40mm, lower vertical wall height: 30mm, step) A metal cross-section hat-shaped member (hereinafter referred to as a comparative example member) having a bent portion in the longitudinal direction (the radius of curvature of the bent portion is 300 mm) was formed.

上記本発明部材１および比較例部材の金属製断面ハット型形状部材のそれぞれについて、屈曲部およびその近傍（引張応力が発生する部分）の引張応力の分布を測定すると共に、スプリングバック（Ｓ／Ｂ）量を測定したところ、本発明部材１の金属製断面ハット型形状部材では、屈曲部およびその近傍の引張応力は、比較例のそれに比して緩和されていた。
また、表１に示すように、比較例部材ではスプリングバック（Ｓ／Ｂ）量は７．１４ｍｍであるのに対して、本発明部材１ではスプリングバック（Ｓ／Ｂ）量は６．５４であり、主としてスプリングバックに起因する捩れ、３次元形状の寸法精度の低下は生じず、さらに、形状安定性もすぐれていた。
つまり、通常のパンチおよびダイからなるプレス成形用金型によるプレスで上記の断面ハット型形状部材を成形した場合には、大きなスプリングバック、捩れが発生し、寸法精度、形状安定性が非常に劣るものであった。 For each of the metal cross-sectional hat shaped members of the present invention member 1 and the comparative example member, the distribution of the tensile stress in the bent portion and the vicinity thereof (portion where tensile stress occurs) is measured, and the spring back (S / B ) When the amount was measured, in the metal cross-section hat-shaped member of the member 1 of the present invention, the tensile stress in the bent portion and the vicinity thereof was relaxed as compared with that in the comparative example.
Further, as shown in Table 1, the springback (S / B) amount of the comparative example member is 7.14 mm, while the springback (S / B) amount of the invention member 1 is 6.54. In addition, the torsion caused mainly by the spring back did not cause a decrease in the dimensional accuracy of the three-dimensional shape, and the shape stability was excellent.
In other words, when the above-mentioned hat-shaped member having a cross-section is formed by a press using a press-molding die composed of a normal punch and die, a large spring back and twist are generated, and dimensional accuracy and shape stability are very poor. It was a thing.

図７に示されるパンチおよびダイからなるプレス成形用金型、即ち、パンチの寸法は、表１に示すように、長手方向長さＬ：９００ｍｍ、天井部幅ＷＲ：４０ｍｍ、縦壁部高さＨ：４０ｍｍ、上部縦壁部高さＨＵ：４０ｍｍ、下部縦壁部高さＨＬ：３０ｍｍ、段差幅ＷＳ（但し、水平投影長さ。以下も同じ）：４０ｍｍであり、長手方向に屈曲部（屈曲部の曲率半径ρは３００ｍｍ）を有し、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域で、かつ、段差と下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部６（長手方向の長さＲＬ：７０．９ｍｍ、長手直角方向の長さＲＴ：２３．４ｍｍの楕円状）を２箇所に形成した本発明例２のプレス成形用金型を用い、鋼板（引張強度：５９０ＭＰａ級、板厚：１．４ｍｍ）を成形荷重６００ｔでプレス成形し、
長さ７３０ｍｍ×天井部幅４０ｍｍ×高さ４０ｍｍ×フランジ幅２０ｍｍの寸法からなり、一方の縦壁部に段差（但し、上部縦壁部高さ：４０ｍｍ、下部縦壁部高さ：３０ｍｍ、段差幅：４０ｍｍ）を形成し、長手方向に屈曲部（屈曲部の曲率半径は３００ｍｍ）を有する金属製断面ハット型形状部材（以下、本発明部材２という）を成形した。
なお、フィレット部６を設けた位置は、引張応力を有限要素法によるプレス成形解析計算により求めた結果に基づいて、屈曲部以外の領域であって、かつ、成形される属製断面ハット型形状部材に発生する引張応力が４００ＭＰａ以上の稜線部とした。 As shown in Table 1, the length of the press molding die consisting of the punch and die shown in FIG. 7, ie, the punch, is as follows: longitudinal length L: 900 mm, ceiling width W R : 40 mm, vertical wall height H: 40 mm, upper vertical wall height H U : 40 mm, lower vertical wall height H L : 30 mm, step width W S (however, horizontal projection length; the same applies below): 40 mm, longitudinal direction Has a bent portion (the radius of curvature ρ of the bent portion is 300 mm), and includes a region including a region where tensile stress occurs during press forming in a metal cross-section hat-shaped member, and a step and a lower vertical wall portion are formed. The fillet part 6 (longitudinal length R L : 70.9 mm, longitudinal length R T : 23.4 mm elliptical shape) is formed in two places on the ridge line portion to be cut. Using the press molding die of Example 2 of the present invention, a steel plate (tensile strength 590MPa grade, thickness: 1.4mm) was press-molded at a molding load 600t,
It consists of dimensions of length 730mm x ceiling width 40mm x height 40mm x flange width 20mm, with one vertical wall step (however, upper vertical wall height: 40mm, lower vertical wall height: 30mm, step) A metal cross-section hat-shaped member (hereinafter referred to as the present invention member 2) having a bent portion in the longitudinal direction (the radius of curvature of the bent portion is 300 mm) was formed.
The position where the fillet portion 6 is provided is a region other than the bent portion based on the result of obtaining the tensile stress by press molding analysis calculation by the finite element method, and the cross section hat-shaped shape to be molded The ridge line portion has a tensile stress generated in the member of 400 MPa or more.

上記本発明部材２の金属製断面ハット型形状部材について、屈曲部およびその近傍（引張応力が発生する部分）の引張応力の分布を測定すると共に、スプリングバック（Ｓ／Ｂ）量を測定したところ、本発明部材２の金属製断面ハット型形状部材では、屈曲部およびその近傍の引張応力は、比較例のそれに比して緩和されていた。
また、表１に示すように、本発明部材２のスプリングバック（Ｓ／Ｂ）量は６．９２であり、比較例部材に比して小さなスプリングバック（Ｓ／Ｂ）量であることから、主としてスプリングバックに起因する捩れ、３次元形状の寸法精度の低下は小さかった。 With respect to the metal cross-section hat-shaped member of the present invention member 2, the distribution of the tensile stress at the bent portion and the vicinity thereof (the portion where the tensile stress is generated) was measured, and the amount of springback (S / B) was measured. In the metal cross-section hat-shaped member of the member 2 of the present invention, the tensile stress in the bent portion and the vicinity thereof was relaxed as compared with that in the comparative example.
Moreover, as shown in Table 1, the springback (S / B) amount of the member 2 of the present invention is 6.92, which is a smaller springback (S / B) amount than the comparative example member. The torsion caused mainly by the springback and the decrease in dimensional accuracy of the three-dimensional shape were small.

図８に示されるパンチおよびダイからなるプレス成形用金型、即ち、パンチの寸法は、表１に示すように、長手方向長さＬ：９００ｍｍ、天井部幅ＷＲ：４０ｍｍ、縦壁部高さＨ：４０ｍｍ、上部縦壁部高さＨＵ：４０ｍｍ、下部縦壁部高さＨＬ：３０ｍｍ、段差幅ＷＳ（但し、水平投影長さ。以下も同じ）：４０ｍｍであり、長手方向に屈曲部（屈曲部の曲率半径ρは３００ｍｍ）を有し、屈曲部の領域内であって、かつ、段差と下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部６（長手方向の長さＲＬ：６５．０ｍｍ、長手直角方向の長さＲＴ：２３．４ｍｍの楕円状）を１箇所に形成した本発明例３のプレス成形用金型を用い、鋼板（引張強度：５９０ＭＰａ級、板厚：１．４ｍｍ）を成形荷重６００ｔでプレス成形し、
長さ７３０ｍｍ×天井部幅４０ｍｍ×高さ４０ｍｍ×フランジ幅２０ｍｍの寸法からなり、一方の縦壁部に段差（但し、上部縦壁部高さ：４０ｍｍ、下部縦壁部高さ：３０ｍｍ、段差幅：４０ｍｍ）を形成し、長手方向に屈曲部（屈曲部の曲率半径は３００ｍｍ）を有する金属製断面ハット型形状部材（以下、本発明部材３という）を成形した。 As shown in Table 1, the length of the press molding die consisting of the punch and die shown in FIG. 8, ie, the punch, is as follows: longitudinal length L: 900 mm, ceiling width W R : 40 mm, vertical wall height H: 40 mm, upper vertical wall height H U : 40 mm, lower vertical wall height H L : 30 mm, step width W S (however, horizontal projection length; the same applies below): 40 mm, longitudinal direction Has a bent portion (the radius of curvature ρ of the bent portion is 300 mm), a fillet portion having a shorter cross-sectional circumference than the surroundings in the ridge line portion formed in the bent portion region and formed by the step and the lower vertical wall portion 6 (longitudinal length R L : 65.0 mm, longitudinal perpendicular length R T : 23.4 mm oval shape) formed in one place using a press-molding die of Example 3 of the present invention. (Tensile strength: 590 MPa class, plate thickness: 1.4 mm) Molding load 600 t Press-molded,
It consists of dimensions of length 730mm x ceiling width 40mm x height 40mm x flange width 20mm, with one vertical wall step (however, upper vertical wall height: 40mm, lower vertical wall height: 30mm, step) A metal cross-section hat-shaped member (hereinafter referred to as member 3 of the present invention) having a bent portion in the longitudinal direction (the radius of curvature of the bent portion is 300 mm) was formed.

上記本発明部材３の金属製断面ハット型形状部材について、屈曲部およびその近傍（引張応力が発生する部分）の引張応力の分布を測定すると共に、スプリングバック（Ｓ／Ｂ）量を測定したところ、本発明部材３の金属製断面ハット型形状部材では、屈曲部およびその近傍の引張応力は、比較例のそれに比して格段に緩和されていた。
また、表１に示すように、本発明部材３のスプリングバック（Ｓ／Ｂ）量は６．２４であり、比較例部材に比して極めて小さなスプリングバック（Ｓ／Ｂ）量であるため、主としてスプリングバックに起因する捩れ、３次元形状の寸法精度の低下は生じず、さらに、形状安定性もすぐれていた。 Regarding the metal cross-section hat-shaped member of the member 3 of the present invention, the distribution of the tensile stress at the bent portion and the vicinity thereof (the portion where the tensile stress is generated) and the amount of spring back (S / B) were measured. In the metal cross-section hat-shaped member of the member 3 of the present invention, the tensile stress in the bent portion and the vicinity thereof was remarkably relaxed as compared with that in the comparative example.
Moreover, as shown in Table 1, the spring back (S / B) amount of the member 3 of the present invention is 6.24, which is an extremely small spring back (S / B) amount compared to the comparative example member. The torsion mainly due to the springback did not cause a decrease in the dimensional accuracy of the three-dimensional shape, and the shape stability was excellent.

表１に示される実施例１〜３の結果から、天井部および縦壁部を有し、長手方向の平面内で屈曲部を有するパンチ及びダイからなるプレス成形用金型であって、前記パンチ及びダイは、前記縦壁部の一方に末広がり状の段差を有し、上部縦壁部と下部縦壁部を形成し、前記屈曲部を含む領域（図６）、あるいは、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域（図７）で、前記段差と前記下部縦壁部が形成する稜線部に、あるいはさらに、屈曲部の領域内の前記稜線部のみ（図８）に、断面周長が周囲より短いフィレット部を１個又は複数個有するプレス成形用金型により成形された金属製断面ハット型形状部材は、引張応力が緩和され、スプリングバック（Ｓ／Ｂ）量が小さいため、３次元方向の捩れ発生が極少であり、このため寸法精度および形状安定性は非常に優れていることがわかる。   From the results of Examples 1 to 3 shown in Table 1, a die for press molding comprising a punch and a die having a ceiling portion and a vertical wall portion and having a bent portion in a plane in the longitudinal direction, the punch And the die has a diverging step on one of the vertical wall portions, forms an upper vertical wall portion and a lower vertical wall portion, and includes a region including the bent portion (FIG. 6), or a metal cross-sectional hat type In a region (FIG. 7) including a region where tensile stress is generated in the shape member during press molding, only the ridge line portion in the ridge line portion formed by the step and the lower vertical wall portion or in the bent portion region (FIG. 8), the metal cross-section hat-shaped member formed by a press-molding die having one or more fillet portions whose cross-sectional circumference is shorter than the periphery has a reduced tensile stress and a spring back (S / B) Since the amount is small, twisting in the three-dimensional direction It is very small, and therefore the dimensional accuracy and shape stability can be seen to be very good.

Figure 2010005651
Figure 2010005651

次に、金属製断面ハット型形状部材のプレス成形に際し、板押さえを用いて成形した場合の、スプリングバック（Ｓ／Ｂ）に及ぼす影響について調査した。
即ち、前記実施例１〜３におけるプレス成形は、図９に示されるいわゆるフォーム成形で行ったが、上記本発明例１〜３のプレス成形用金型および比較例のプレス成形用金型を用いて、図１０に示される如く、板押さえ１３を用いたドロー成形を行った。
なお、成形条件は、板押さえを用いた以外は、前記実施例１〜３の場合と同じ。
板押さえ１３を用いたドロー成形で得られた各金属製断面ハット型形状部材について測定した、それぞれのスプリングバック（Ｓ／Ｂ）量を表２に示す。
表２から明らかなように、板押さえ１３を用いた場合には、金属製断面ハット型形状部材のスプリングバック（Ｓ／Ｂ）量をより低減できることがわかる。 Next, the influence on the springback (S / B) when the metal cross-section hat-shaped member was formed using a plate press was investigated.
That is, the press molding in Examples 1 to 3 was performed by the so-called foam molding shown in FIG. 9, but the press molding dies of Examples 1 to 3 of the present invention and the press molding dies of Comparative Examples were used. Then, as shown in FIG. 10, draw molding using the plate presser 13 was performed.
The molding conditions are the same as those in Examples 1 to 3 except that plate pressing is used.
Table 2 shows the amount of each springback (S / B) measured for each metal cross-section hat-shaped member obtained by draw forming using the plate presser 13.
As can be seen from Table 2, when the plate presser 13 is used, the amount of spring back (S / B) of the metal cross-section hat-shaped member can be further reduced.

Figure 2010005651
Figure 2010005651

以上のとおり、本発明の金属製断面ハット型形状部材のプレス成形用金型およびそのプレス成形方法によれば、プレス成形用金型の屈曲部を含む領域の段差と下部縦壁部が形成する稜線部に、あるいは、引張応力が発生する領域を含む領域の段差と下部縦壁部が形成する稜線部に、あるいは、屈曲部の領域内の前記稜線部のみに、断面周長が周囲より短いフィレット部を設けておくことにより、成形後の金属製断面ハット型形状部材の引張応力を緩和し、スプリングバックの発生を極めて小さくし、すぐれた３次元形状の寸法精度を有し、すぐれた形状安定性を有する金属製断面ハット型形状部材を成形することができる。   As described above, according to the press-molding die of the metal cross-sectional hat-shaped member and the press molding method of the present invention, the step and the lower vertical wall portion of the region including the bent portion of the press-molding die are formed. The perimeter of the cross section is shorter than the surroundings at the ridgeline, or at the ridgeline formed by the step of the region including the region where tensile stress is generated and the lower vertical wall, or only at the ridgeline in the bent region. By providing the fillet part, the tensile stress of the metal cross-section hat-shaped member after molding is relieved, the occurrence of springback is extremely reduced, and it has excellent dimensional accuracy of three-dimensional shape and excellent shape A metal cross-section hat-shaped member having stability can be formed.

ビードを設けた従来の断面ハット型部材の斜視図。The perspective view of the conventional cross-sectional hat type | mold member which provided the bead. 段差を設けた従来の断面ハット型部材の斜視図。The perspective view of the conventional cross-sectional hat type | mold member which provided the level | step difference. 段差およびビードを設けた従来の断面ハット型部材の斜視図。The perspective view of the conventional cross-sectional hat type | mold member which provided the level | step difference and the bead. フィレット部６を形成したプレス金型によるプレス形成の動作図で、（ａ）は成形初期段階、（ｂ）は成形途中段階、（ｃ）は成形終了段階を示す。FIG. 5 is an operation diagram of press forming by a press die having a fillet portion 6, where (a) shows a molding initial stage, (b) shows a molding intermediate stage, and (c) shows a molding end stage. 比較例のプレス成形用金型のパンチの斜視図および平面図。The perspective view and top view of the punch of the metal mold | die for press molding of a comparative example. 本発明例１のプレス成形用金型のパンチの斜視図および平面図。The perspective view and top view of the punch of the metal mold | die for press molding of the example 1 of this invention. 本発明例２のプレス成形用金型のパンチの斜視図および平面図。The perspective view and top view of the punch of the metal mold | die for press molding of the example 2 of this invention. 本発明例３のプレス成形用金型のパンチの斜視図および平面図。The perspective view and top view of the punch of the metal mold | die for press molding of Example 3 of this invention. 本発明のフォーム成形方法についての動作図で、（ａ）は成形開始段階、（ｂ）は成形中、（ｃ）は成形終了段階を示す。It is an operation | movement figure about the foam shaping | molding method of this invention, (a) is a shaping | molding start stage, (b) is in shaping | molding, (c) shows a shaping | molding completion | finish stage. 本発明のドロー成形方法についての動作図で、（ａ）は成形開始段階、（ｂ）は成形中、（ｃ）は成形終了段階を示す。It is an operation | movement figure about the draw molding method of this invention, (a) is a shaping | molding start stage, (b) is during shaping | molding, (c) shows a shaping | molding completion | finish stage.

符号の説明Explanation of symbols

１ （成形される）鋼板
２ パンチ
３ ダイ
４ 凹部
５ 凸部
６ フィレット部
７ 天井部
８ 縦壁部
９ 上部縦壁部
１０ 下部縦壁部
１１ 段差
１２ フランジ部
１３ 板押さえ
ｓ プレス成形途中における凹部４と凸部５との間隔 DESCRIPTION OF SYMBOLS 1 Steel plate 2 (Formed) Punch 3 Die 4 Concave part 5 Convex part 6 Fillet part 7 Ceiling part 8 Vertical wall part 9 Upper vertical wall part 10 Lower vertical wall part 11 Step 12 Flange part 13 Plate presser s Concave part in the middle of press forming 4 and the convex part 5

Claims (5)

天井部および縦壁部を有し、長手方向の平面内で屈曲部を有するパンチ及びダイからなるプレス成形用金型であって、前記パンチ及びダイは、前記縦壁部の一方に末広がり状の段差を有し、上部縦壁部と下部縦壁部を形成し、前記屈曲部を含む領域で、前記段差と前記下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を１個又は複数個有することを特徴とする金属製断面ハット型形状部材のプレス成形用金型。   A press-molding die comprising a punch and a die having a ceiling part and a vertical wall part and having a bent part in a plane in the longitudinal direction, the punch and the die having a divergent shape on one side of the vertical wall part A fillet portion having a step, forming an upper vertical wall portion and a lower vertical wall portion, and a ridge line portion formed by the step and the lower vertical wall portion in a region including the bent portion having a shorter cross-sectional circumference than the surroundings A metal mold for press-molding a cross-sectional hat-shaped member made of metal, characterized in that it has one or more. 天井部および縦壁部を有し、長手方向の平面内で屈曲部を有するパンチ及びダイからなるプレス成形用金型であって、前記パンチ及びダイは、前記縦壁部の一方に末広がり状の段差を有し、上部縦壁部と下部縦壁部を形成し、金属製断面ハット型形状部材にプレス成形時の引張応力が発生する領域を含む領域で、前記段差と前記下部縦壁部が形成する稜線部に、断面周長が周囲より短いフィレット部を１個又は複数個有することを特徴とする金属製断面ハット型形状部材のプレス成形用金型。   A press-molding die comprising a punch and a die having a ceiling part and a vertical wall part and having a bent part in a plane in the longitudinal direction, the punch and the die having a divergent shape on one side of the vertical wall part A step having a step, forming an upper vertical wall portion and a lower vertical wall portion, and including a region where tensile stress is generated during press forming on a metal cross-section hat-shaped member, wherein the step and the lower vertical wall portion are A metal mold for press-molding a metal cross-sectional hat-shaped member having one or a plurality of fillet portions whose cross-sectional peripheral length is shorter than that of the surrounding at the ridge line portion to be formed. 前記フィレット部は、前記屈曲部の領域内の前記稜線部のみに形成されていることを特徴とする請求項１記載の金属製断面ハット型形状部材のプレス成形用金型。   The metal mold for press-forming a metal cross-section hat-shaped member according to claim 1, wherein the fillet part is formed only in the ridge line part in the region of the bent part. 更に、板押さえを有することを特徴とする請求項１〜３の何れか１項に記載の金属製断面ハット型形状部材のプレス成形用金型。   The metal mold for press-forming a metal cross-section hat-shaped member according to any one of claims 1 to 3, further comprising a plate presser. 請求項１〜４の何れか１項に記載のプレス成形用金型を用いて金属板をプレス成形し、前記パンチの下死点にて前記フィレット部を形成してプレス成形を終了した後、前記フィレット部を含まないように前記金属板を切断して、フランジ部を形成し、天井部、縦壁部及び前記フランジ部からなる金属製断面ハット型形状部材とすることを特徴とする金属製断面ハット型形状部材のプレス成形方法。   After press-molding a metal plate using the press-molding die according to any one of claims 1 to 4, forming the fillet portion at the bottom dead center of the punch, The metal plate is cut so as not to include the fillet portion, a flange portion is formed, and a metal cross-sectional hat-shaped member including a ceiling portion, a vertical wall portion, and the flange portion is formed. A method for press-forming a cross-section hat-shaped member.
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CN102380534A (en) * 2010-09-02 2012-03-21 丰田纺织株式会社 Producing method of compact
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WO2014112391A1 (en) 2013-01-21 2014-07-24 Ｊｆｅスチール株式会社 Method for manufacturing metal component with three-dimensional edge, and die for manufacturing
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KR101708581B1 (en) 2013-01-21 2017-02-20 제이에프이 스틸 가부시키가이샤 Method for manufacturing metal component with three-dimensional edge and die sets for manufacturing the same
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JP2017042773A (en) * 2015-08-24 2017-03-02 Ｊｆｅスチール株式会社 Press molding method

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