JP4075417B2

JP4075417B2 - Press molding method and press molding apparatus

Info

Publication number: JP4075417B2
Application number: JP2002069904A
Authority: JP
Inventors: 和司高橋; 英広桑原
Original assignee: Toyota Auto Body Co Ltd
Current assignee: Toyota Auto Body Co Ltd
Priority date: 2002-03-14
Filing date: 2002-03-14
Publication date: 2008-04-16
Anticipated expiration: 2022-03-14
Also published as: JP2003266122A

Description

【０００１】
【発明の属する技術分野】
本発明は、プレス成形方法およびプレス成形装置に関し、特に閉断面形状となる製品をプレス成形するプレス成形方法およびプレス成形装置に関する。
【０００２】
【従来の技術】
鋼板素材を、上面部、下面部、および左右の側面部を有する閉断面形状にプレス成形するに当たって、従来は、図６に示すように、所要の孔明けや浅い絞り加工を施された略平板状の鋼板素材７０１を、図７に示すように、その上面部の左側部７１、上面部の右側部７２となる両端部を折り曲げ成形して鋼板素材７０２となし、次いで図８に示すように、下面部左端７６で略直角に折り曲げて断面Ｌ字状に成形し、下面部７５と左側面部７３からなる鋼板素材７０３とする。
その後、図９に示すように、前記左側面部７３の上端から延設された上面部の左側部７１と下面部７５との間に、下面部７５と略同一の厚さを有し鋼板素材７０３の紙面に対して直角方向の両端から突出する長さの中子８４０を前記上面部７１と左側面部７３に接触するように、すなわち鋼板素材７０３が中子８４０に上面部７１で引っかかって保持されるように挿入し、中子８４０を挿入した状態で、中子８４０の厚さと鋼板素材７０３の２枚分の板厚とを合計した厚さに略等しい幅の溝を有する下型８２０に載置し、下型８２０の前記溝内に上下方向に摺動可能に設けたクッション８５０により下面部７５の下面から押圧して中子８４０とクッション８５０により鋼板素材７０３を支持し（図９は、この支持した状態を示す。）、図１１に示すように、中子８４０の鋼板素材７０３の前後の突出端に側面視コ字状の上型８３０の前後端を当接して、この状態のまま鋼材素材７０３と中子８４０を前記下型８２０の溝内に嵌入させることにより、図１０に示すように、下面部７５から延設される右側面部７４を折り曲げ成形し、閉断面とする。
その後、上型８３０を上昇させると、鋼材素材７０３と中子８４０は下方からバネ８５１により上方に押圧されているクッション８５０により上方に押圧されて下型８２０の溝から脱出させられる。その後、閉断面となった鋼板素材７０３から前記中子８４０を引き抜いて閉断面の製品として成形する方法が採用されている。
【０００３】
【発明が解決しようとする課題】
ところが、上記のような中子を出し入れする成形方法は、中子の出し入れのための横方向のスライド機構が必要となり、型構造を複雑とし、プレス工程を自動化するような場合には、使用するプレス機械が大型化し、しかもサイクルタイムが長くなる等の問題がある。
また、上型が図１１に示すような側面視コ字形となるため、型強度の確保が困難となり、強度を確保するためには型のコストが高くなるという問題がある。
さらに、中子による成形では、成形後、スプリングバックにより閉断面が開いてしまい修正工程が必要となるという問題もある。
【０００４】
そこで、本発明は、かかる課題を解決すべく、閉断面形状の成形品を中子を用いることなくプレス成形するプレス成形方法及びプレス成形装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明に係る請求項１に記載のプレス成形方法は、鋼板素材を、上面部、下面部、および左右の側面部を有する閉断面形状にプレス成形するプレス成形方法であって、前記下面部の左右両端から前記両側面部が延設され、前記上面部の左右方向の一側部が前記一方の側面部の上端から延設され、前記上面部の左右方向の他側部が前記他方の側面部の上端から延設され、前記下面部と前記他方の側面部とが最終形状に対し所定角度開いた途中形状に成形する工程と、前記各部の外面を押えつつ前記他方の側面部を、前記他方の側面部が前記下面部と連なる下面部端の下方に所要の隙間を設けた位置を回動中心として回動する回動型により折り曲げ、最終形状に成形する工程とを備えることを特徴とする。
よって、最終形状に対し所定角度開いた途中形状に成形した鋼板素材を、その他方の側面部の下端近傍でプレス方向と直交する軸を回動中心として回動させて最終形状に成形するので、プレスの１ストロークの中で最終形状に成形でき、プレス時間の短縮ひいてはサイクルタイムの短縮ができる。
【０００６】
また、本発明に係る請求項２に記載のプレス成形装置は、上面部、下面部、および左右の側面部を有する閉断面形状の製品を、前記下面部の左右両端から前記両側面部が延設され、前記上面部の左右方向の一側部が前記一方の側面部の上端から延設され、前記上面部の左右方向の他側部が前記他方の側面部の上端から延設され、前記下面部と前記他方の側面部とが最終形状に対し所定角度開いた途中形状から最終形状にプレス成形するプレス成形装置であって、前記下面部と、一方の下面部端から延設された一方の側面部とに当接する下型と、前記上面部の一側部に当接する上型と、前記他方の側面部と、前記上面部の他側部とに当接し、前記他方の下面部端に所要の隙間を設けた位置を回動中心として回動可能な回動型と、該回動型を回動させる回動機構とからなることを特徴とする。
よって、プレス方向を、プレス方向と直交する軸を回動中心とした回動方向に変換して成形できるので、プレス成形装置を小型化でき、したがって使用するプレス機械も小型のものが利用できる。
また、回動型により他方の下面部端から延設され最終形状に対し所定角度開いた途中形状に成形された他方の側面部と、該他方の側面部の上端から延設された上面部の他側部とを保持しながら回動型を回動して成形するので、回動の中心となる下面部端が確実に折曲線となり、精度良く成形できる。
【０００７】
また、本発明に係る請求項３に記載のプレス成形装置は、前記回動機構が、前記回動型を、他方の側面部が最終形状まで閉じられる角度以上の所定角度まで回動可能としたことを特徴とする。
よって、他方の側面部をあらかじめスプリングバックを見込んだ角度まで折り曲げることができるので、修正工程を設ける必要がなく、安価に閉断面形状の成形品を製造することができる。
【０００８】
また、本発明に係る請求項４に記載のプレス成形装置は、下型が、鋼板素材の下面部と、一方の下面部端から延設された一方の側面部の一部とに当接するとともに、上型が、前記鋼板素材の前記一方の側面部の残部と、該一方の側面部の上端から延設された上面部の一側部とに当接するものであることを特徴とする。
よって、鋼板素材を下型により下面部と一方の側面部の一部との外側の２面で支持するので、鋼板素材を下型にセットしやすく、しかも、上型でも一方の側面部の残部とこの一方の側面部の上端から延設された上面部の一側部との２面で押さえるので、最終成形前に鋼板素材を確実に保持でき、成形時の精度を確保することができる。
【０００９】
【発明の実施の形態】
次に、本発明に係るプレス成形方法及びプレス成形装置の一の実施の形態について図面を参照して以下に説明する。本実施の形態のプレス成形方法及びプレス成形装置により成形される製品は、車両用座席のフレームの一部品となるものである。
ここで、図１は、本発明のプレス成形方法及びプレス成形装置を適用する前の予備曲げした状態の鋼板素材を示した図であり、図２は、鋼板素材をプレス成形装置にセットした状態のプレス成形装置の部分断面図である。
【００１０】
（構成）
本実施の形態のプレス成形装置の構成について説明する。
プレス成形装置１０は、鋼板素材が従来技術で説明した図６から図８に示した形状に成形され、さらにその後、図１に示す形状に予備曲げされた鋼板素材７０４を閉断面形状の最終形状に成形する装置である。なお、「鋼板素材７０」は閉断面形状の最終形状に成形された製品を示し、成形途中の形状のものを「鋼板素材７０４」と称し、鋼板素材７０４の左右方向は、各図示の断面における左右方向として以下説明する。
すなわち、鋼板素材７０４は、図８に示した下面部７５と左側面部７３（一方の側面部）を区切る下面部左端７６で略直角に折り曲げて断面Ｌ字状に成形した鋼板素材７０３を、図１に示すように、下面部７５から連続して右側面部７４（他方の側面部）を区切る下面部右端７７を形成するように底面に二つの角部を有するＵ字状の溝を形成したダイス９２０上に載置し、上方から先端が前記ダイス９２０のＵ字状断面に相似形状のポンチ９３０により押圧することにより、予備曲げされたものである。
【００１１】
プレス成形装置１０は、図２乃至図４に示すように、鋼板素材７０４を載置したときに、鋼板素材７０４の下面部７５と下面部左端７６（一方の下面部端）から延設された左側面部７３の下方の該左側面部７３の一部とに当接することにより鋼板素材７０４を支持する下型２０と、該下型２０に載置された鋼板素材７０４の左側面部７３の上方の残部と、該左側面部７３の上端から下面部７５と平行な方向に延設された上面部の左側部７１とに当接する上型３０と、下型２０に載置された鋼板素材７０４の下面部右端７７（他方の下面部端）から延設された右側面部７４と、該右側面部７４の上端から右側面部７４と直角方向に延設された上面部の右側部７２に当接して、下面部右端７７近傍を回動中心として回動させることにより右側面部７４を折り曲げる回動型４０と、該回動型４０を回動させる回動機構５０とからなる。
【００１２】
下型２０は、図３、図４に示すように、断面が概略菱形で、前記鋼板素材７０４の下面部７５と当接し、該下面部７５の幅と略同じ幅を有する略水平な下面部受面２１２と、該下面部受面２１２から垂直に立ち上がり前記鋼板素材７０４の左側面部７３の下方の該左側面部７３の一部と当接する側面部受面２１１と、該側面部受面２１１の上端から下面部受面２１２とは反対方向に上向きの傾斜面２１３により連続する略水平の上端面２１４と、上端面２１４の前記傾斜面２１３と反対側の端部から垂下する縦面２１５と、該縦面２１５の下端から前記下面部受面２１２に向かう下向きの傾斜面２１６と、該下向きの傾斜面２１６から下面部受面２１２と所定の厚さの保持部２１９を形成する下端面２１７と、該下端面２１７の端部から上方の前記下面部受面２１２の端部に連結する垂直面２１８とから形成され、図示は省略したが紙面に垂直方向の長さは前記鋼板素材７０４の長さより長く、前記鋼板素材７０４の両端から突出して下型脚を介してベース６０に支持されている。
【００１３】
なお、下型２０の前記下面部受面２１２と垂直面２１８の交点は、前記鋼板素材７０４の下面部右端７７と略一致し、この交点の近傍を回動中心として後述する回動型４０が回動するようになっている。
また、下型２０の前記傾斜面２１６は、図３に示すように、回動型４０が回動する前の型開きの状態で回動型４０と当接あるいは僅かの間隙を有するような傾斜角度に設定されている。
【００１４】
上型３０は、下面３１７に前記下型２０の傾斜面２１３と前記鋼板素材７０４の左側面部７３とにより囲まれる三角溝に係合する三角突起を形成した略四角形断面のブロック３１であり、その右側面３１３に、前記鋼板素材７０４の左側面部７３の、前記下型２０の側面部受面２１１が当接している部分の残余の部分と当接する側面部押面３１１と、該側面部押面３１１の上端から右方向に張り出し、上型３０が下降したときに前記鋼板素材７０４の上面部の左側部７１に外側から当接する上面部押面３１２とにより逆さＬ字状に下向き開放断面の凹部が形成されている。
上面３１４は、平面であり、上型ラム３０１に設けられたシリンダロッド３０２に接続されて、該上型ラム３０１の下方に突出可能に支持されている。
上型ラム３０１の下面には、上型３０の左側近傍に下向きの押圧片３２が突出状に取り付けられている。
【００１５】
つぎに、回動型４０は、側面視で概略裏返しのＬ字断面で、上部の逆さＬ字状のＬ字ブロック４１とその下方の下辺部４２とからなる。Ｌ字ブロック４１の左側面４１３には、下端が前記鋼板素材７０４の下面部右端７７の近傍に位置する側面部載置面４１１を形成し、該側面部載置面４１１の上端から左方向に張り出し、回動型４０が回動したときに前記鋼板素材７０４の上面部の右側部７２に外側から当接する上面部載置面４１２とにより逆さＬ字状の下向き開放断面の凹部が形成されている。
左側面４１３の裏側の右側面４１４の上部には、回動型４０を常に型開き状態に付勢するコイルバネ５９が連結されている。
前記側面部載置面４１１の下端から下方に僅か離れて直角に左側面４１３方向にＬ字状に張り出す下辺部４２を延在させ、該下辺部４２の上面４２１と側面部載置面４１１の下端との間には、下辺部４２の張り出し方向とは反対方向にえぐられて、型開き状態のときに前記下型２０の保持部２１９を収納する溝部４２２が形成されている。
なお、図示の回動型４０は、複数のブロックを組み合わせてＬ字状に形成されているが、１部品から構成してもよい。
【００１６】
回動機構５０は、回動型４０側に取り付けられる部分とベース６０側に取り付けられる部分とにより構成される。
すなわち、回動型４０側には、回動型４０の下辺部４２の長さ方向（紙面と直角方向）の略中央下面に取り付けられ、上面が下辺部４２の下面に取り付けられる平面形状で、下面が前記鋼板素材７０４の下面部右端７７の近傍を中心とする円形のガイド面を有するガイドローラ５２と、該ガイドローラ５２から長さ方向で前後に離間して前記下辺部４２の下面に取り付けられた略四角形のガイドブロック５３と、該ガイドブロック５３の、前記下辺部４２の左端側にブラケット５１１を介して支持された受圧ローラ５１が取り付けられている。
【００１７】
一方、ベース６０側には、前記ガイドローラ５２と略同一の長さを有し、そのガイド面と同心円で接触する円弧状断面のガイドレール５４と、該ガイドレール５４から離間した長さ方向の前後で前記ガイドブロック５３との間にベース６０から立設されたガイド板５５が取り付けられている。
そして、前記ガイドブロック５３とガイド板５５とは、該ガイド板５５に穿設した円弧状のガイド長孔５５１に、ガイドブロック５３に水平方向に立設したガイドピン５３１を挿通することにより、回動型４０側とベース６０側とを連結している。
また、前記ガイドローラ５２、ガイドレール５４、およびガイド長孔５５１の円弧は、前記鋼板素材７０４の下面部右端７７の近傍を中心とする同心円により形成されている。
【００１８】
（作用）
以上のように構成された本実施の形態のプレス成形装置１０を用いて鋼板素材７０４を閉断面形状に成形するプレス成形方法について説明する。
まず、プレス成形装置１０は、図３に示すように、上型ラム３０１が上昇位置にあり、上型３０および押圧片３２も二点鎖線で示す位置に上昇している。したがって、回動型４０はコイルバネ５９の引張力により引っ張られてＬ字ブロック４１の側面部載置面４１１が傾斜して開いた状態（型開き状態）となっている。
この型開き状態のプレス成形装置１０の下型２０上に、図１に示す下面部７５と右側面部７４とが最終形状に対し所定角度開いた途中形状に成形された鋼板素材７０４を、下型２０の下面部受面２１２に下面部７５を載置し、側面部受面２１１に左側面部７３が接触するように載置する。
このとき、左側面部７３の上方は側面部受面２１１から突出した状態となっている。また、途中形状の右側面部７４とＬ字ブロック４１とは接触していない。
【００１９】
つぎに、上型ラム３０１を徐々に下降させながら同時に上型３０を支持するシリンダを動作させて上型３０を先に下型２０上に位置させて、上型３０の側面部押面３１１と上面部押面３１２により、前述の下型２０の側面部受面２１１から突出した左側面部７３の残部と上面部の左側部７１とをそれぞれ押圧して鋼板素材７０４を下型２０上に固定的に保持する。
上型３０が下型２０上の鋼板素材７０４を押圧している状態を保持したまま、さらに上型ラム３０１を下降させると、上型ラム３０１に取り付けられた押圧片３２も下降し、該押圧片３２の下端が受圧ローラ５１に当接し、さらに上型ラム３０１を下降させると押圧片３２が受圧ローラ５１を介して回動型４０を鋼板素材７０４の下面部右端７７近傍を回動中心としてコイルバネ５９を引っ張りながら図示の反時計方向に回動させる。
【００２０】
すなわち、回動型４０は下辺部４２の下面に取り付けた半円状のガイドローラ５２のガイド面がベース６０に取り付けたガイドレール５４のガイド面上を、鋼板素材７０４の下面部右端７７近傍を回動中心として摺動することにより回動する。同時にガイドブロック５３に立設したガイドピン５３１がガイド板５５に穿設したガイド長孔５５１に沿って同様に鋼板素材７０４の下面部右端７７近傍を回動中心として回動する。
なお、この回動中心は、図５に示すように、鋼板素材７０４の下面部右端７７より隙間ｔだけ下方の位置に回動中心ｋを設定することが望ましい。
そうすると、回動型４０の回動当初では上面部載置面４１２が上面部の右側部７２と隙間ｍの間隙を有するように上面部載置面４１２を設定でき、回動型４０の回動に伴うＬ字ブロック４１と右側面部７４との接触が容易になり、回動型４０の回動終端では上面部載置面４１２が上面部の右側部７２を押圧するように当接するので、下面部右端７７の折り曲げ形状をルーズにすることなく、精度よく折り曲げることができる。
【００２１】
上型ラム３０１をさらに下降させて受圧ローラ５１を介して回動型４０を回動させると右側面部７４が下面部７５に対して垂直に折り曲げられて図４に示す状態となるが、図５（Ｂ）に示すように、回動型４０をそれよりさらに角度θだけ反時計方向に回動させて、右側面部７４の上面部右側部７２が上面部の左側部７１上に重なるように折り曲げると、閉断面形状にプレス加工された鋼板素材７０４をこのプレス加工装置１０から取り出したときに、右側面部７４がスプリングバックを起こしても最終形状より開くことがなく、精度の高い閉断面形状が形成される。すなわち、前記角度θは、右側面部７４がスプリングバックを起こしても最終形状より開くことがないような角度を選択すればよい。
【００２２】
図５（Ｂ）に示す角度θまで回動型４０を回動させた後、上型ラム３０１を徐々に上昇させると、回動型４０は、押圧片３２と受圧ローラ５１が接触した状態を保って、コイルスプリング５９の引張力により回動型４０の下面部４２の上面４２１が下型２０の傾斜面２１６に当接するまで時計方向に回動して図３の型開き状態に戻る。
そして、上型ラム３０１をさらに上昇させるとともにシリンダを動作させて上型３０を下型２０から離間させる。
その後、閉断面形状にプレス加工された鋼板素材７０を回動型４０から取り出して一連のプレス加工を終了する。
【００２３】
このように、本実施の形態のプレス加工方法及びプレス加工装置によれば、下面部７５の左右両端から左右両側面部７３、７４が延設され、上面部の左側部７１が左側面部７３の上端から延設され、上面部の右側部７２が右側面部７４の上端から延設され、下面部７５と前記右側面部７４とが最終形状に対し所定角度開いた途中形状に成形された鋼板素材７０４を、下面部７５と左側面部７３の一部に当接する下型２０と、左側面部７３の残部と上面部の左側部７１とに当接する上型３０とにより保持し、右側面部７４および上面部の右側部７２に当接し、回動機構５０により下面部右端７７の下方に所要の隙間ｔを設けた位置を回動中心ｋとして回動される回動型４０により下面部７５に対して右側面部７４を折り曲げて閉断面の最終形状に成形するようにしたので、中子を使用することなく短時間で精度の高い閉断面形状の製品をプレス加工することが可能となった。
【００２４】
なお、本発明は前記実施の形態のものに限定されるものではなく、その趣旨を逸脱しない範囲で様々な変更が可能である。
例えば、前記実施の形態では、左右の側面部を平坦面のもので示したが、これに限られず、外側に凸のビードを形成したものでも可能である。
また、上面部の左右両側部は直線状のもので示したが凹凸のある形状のものであってもよい。
【００２５】
【発明の効果】
本発明は、鋼板素材を、上面部、下面部、および左右の側面部を有する閉断面形状にプレス成形するプレス成形方法であって、前記下面部の左右両端から前記両側面部が延設され、前記上面部の左右方向の一側部が前記一方の側面部の上端から延設され、前記上面部の左右方向の他側部が前記他方の側面部の上端から延設され、前記下面部と前記他方の側面部とが最終形状に対し所定角度開いた途中形状に成形する工程と、前記各部の外面を押えつつ前記他方の側面部を、前記他方の側面部が前記下面部と連なる下面部端の下方に所要の隙間を設けた位置を回動中心として回動する回動型により折り曲げ、最終形状に成形する工程とを備えるプレス成形方法としたので、プレスの１ストロークの中で閉断面形状の製品が成形でき、プレス時間の短縮ひいてはサイクルタイムの短縮が可能となった。
【００２６】
また、上面部、下面部、および左右の側面部を有する閉断面形状の製品を、前記下面部の左右両端から前記両側面部が延設され、前記上面部の左右方向の一側部が前記一方の側面部の上端から延設され、前記上面部の左右方向の他側部が前記他方の側面部の上端から延設され、前記下面部と前記他方の側面部とが最終形状に対し所定角度開いた途中形状から最終形状にプレス成形するプレス成形装置であって、前記下面部と、一方の下面部端から延設された一方の側面部とに当接する下型と、前記上面部の一側部に当接する上型と、前記他方の側面部と、前記上面部の他側部とに当接し、前記他方の下面部端に所要の隙間を設けた位置を回動中心として回動可能な回動型と、該回動型を回動させる回動機構とからなるプレス成形装置としたので、プレス成形装置を小型化でき、したがって使用するプレス機械も小型のものを利用することが可能となった。
【図面の簡単な説明】
【図１】本発明の一の実施の形態に係るプレス成形方法及びプレス成形装置を適用する前の予備曲げした状態の鋼板素材を示した図である。
【図２】本発明の一の実施の形態に係るプレス成形装置に鋼板素材をセットした状態のプレス成形装置の部分断面図である。
【図３】本発明の一の実施の形態に係るプレス成形装置に鋼板素材をセットし、鋼板素材を上型と下型で保持した状態のプレス成形装置の断面図である。
【図４】本発明の一の実施の形態に係るプレス成形装置による鋼板素材の成形が終了した状態のプレス成形装置の断面図である。
【図５】本発明の一の実施の形態に係るプレス成形装置の作動状態を説明する線図で、（Ａ）は回動型の回動前、（Ｂ）は回動型の回動の最終端の状態の線図である。
【図６】従来及び本発明の一の実施の形態に係るプレス成形方法に適用する鋼板素材の、抜き工程が終了したもので、（Ａ）は平面図、（Ｂ）は側面図である。
【図７】従来及び本発明の一の実施の形態に係るプレス成形方法に適用する鋼板素材の、上面部の両側部を曲げたもので、（Ａ）は平面図、（Ｂ）は側面図である。
【図８】従来及び本発明の一の実施の形態に係るプレス成形方法に適用する鋼板素材の、底面部に対して一側部が曲げられたもので、（Ａ）は平面図、（Ｂ）は側面図である。
【図９】従来の中子を使用したプレス成形装置の、最終工程前の断面図である。
【図１０】従来の中子を使用したプレス成形装置の、最終工程の断面図である。
【図１１】従来の中子を使用したプレス成形装置の側面図である。
【符号の説明】
１０プレス成形装置
２０下型
３０上型
３０１上型ラム
４０回動型
４１Ｌ字ブロック
４２下辺部
５０回動機構
５１受圧ローラ
５２ガイドローラ
５４ガイドレール
６０ベース
７０鋼板素材
７１上面部の左側部
７２上面部の右側部
７３左側面部
７４右側面部
７５下面部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press molding method and a press molding apparatus, and more particularly to a press molding method and a press molding apparatus for press molding a product having a closed cross-sectional shape.
[0002]
[Prior art]
In press forming a steel plate material into a closed cross-sectional shape having an upper surface portion, a lower surface portion, and left and right side portions, conventionally, as shown in FIG. 6, a substantially flat plate that has been subjected to required drilling and shallow drawing processing. As shown in FIG. 7, the steel plate material 701 is formed into a steel plate material 702 by bending both end portions which become the left side portion 71 of the upper surface portion and the right side portion 72 of the upper surface portion, and then as shown in FIG. The lower surface portion left end 76 is bent at a substantially right angle to form an L-shaped cross section, and a steel plate material 703 composed of the lower surface portion 75 and the left side surface portion 73 is formed.
Thereafter, as shown in FIG. 9, the steel plate material 703 has a thickness substantially the same as that of the lower surface portion 75 between the left surface portion 71 and the lower surface portion 75 of the upper surface portion extending from the upper end of the left surface portion 73. The core 840 having a length protruding from both ends in the direction perpendicular to the paper surface is in contact with the upper surface portion 71 and the left side surface portion 73, that is, the steel plate material 703 is caught and held by the core 840 at the upper surface portion 71. In the state where the core 840 is inserted, it is mounted on the lower mold 820 having a groove having a width substantially equal to the total thickness of the thickness of the core 840 and the thickness of the two steel sheets 703. The steel plate material 703 is supported by the core 840 and the cushion 850 by pressing from the lower surface of the lower surface portion 75 by a cushion 850 provided in the groove of the lower mold 820 so as to be slidable in the vertical direction (FIG. This supported state is shown.), FIG. As shown, the front and rear ends of an upper die 830 having a U-shape in side view are brought into contact with the front and rear protruding ends of the steel plate material 703 of the core 840, and the steel material 703 and the core 840 are placed in the lower die 820 in this state. As shown in FIG. 10, the right side surface portion 74 extending from the lower surface portion 75 is bent and formed into a closed cross section.
Thereafter, when the upper die 830 is raised, the steel material 703 and the core 840 are pressed upward by the cushion 850 pressed upward by the spring 851 from below and escaped from the groove of the lower die 820. Thereafter, a method is employed in which the core 840 is drawn from the steel plate material 703 having a closed cross section and formed as a closed cross section product.
[0003]
[Problems to be solved by the invention]
However, the molding method for inserting and removing the core as described above requires a lateral slide mechanism for inserting and removing the core, which is used when the mold structure is complicated and the pressing process is automated. There is a problem that the press machine becomes large and the cycle time becomes long.
Further, since the upper mold has a U-shape as viewed from the side as shown in FIG. 11, it is difficult to ensure the mold strength, and there is a problem that the cost of the mold is increased to ensure the strength.
Further, in the molding by the core, there is a problem that after the molding, the closed cross section is opened by the spring back, and a correction process is necessary.
[0004]
Therefore, an object of the present invention is to provide a press molding method and a press molding apparatus for press-molding a molded product having a closed cross-sectional shape without using a core, in order to solve such a problem.
[0005]
[Means for Solving the Problems]
The press forming method according to claim 1 of the present invention is a press forming method for press forming a steel plate material into a closed cross-sectional shape having an upper surface portion, a lower surface portion, and left and right side portions, The both side surface portions extend from both left and right ends, one side portion of the upper surface portion in the left and right direction extends from the upper end of the one side surface portion, and the other side portion of the upper surface portion in the left and right direction is the other side surface portion. extending from the upper end of a step of forming a predetermined angle opened the way shape as the lower surface portion and the other side surface portion with respect to the final shape, the other side surface portion while pressing the outer surface of the respective units, the other And a step of bending with a rotating mold that rotates around a position where a required gap is provided below the lower surface end connected to the lower surface portion, and forming a final shape. .
Therefore, because the steel sheet material formed into a halfway shape opened at a predetermined angle with respect to the final shape is rotated around the axis perpendicular to the press direction in the vicinity of the lower end of the other side surface portion and formed into the final shape, The final shape can be formed within one press stroke, and the press time can be shortened and thus the cycle time can be shortened.
[0006]
According to a second aspect of the present invention, there is provided the press molding apparatus according to the present invention, wherein a product having a closed cross-sectional shape having an upper surface portion, a lower surface portion, and left and right side portions extends from both left and right ends of the lower surface portion. One side portion of the upper surface portion in the left-right direction extends from the upper end of the one side surface portion, the other side portion of the upper surface portion in the left-right direction extends from the upper end of the other side surface portion, and the lower surface Part and the other side surface part are press-molded from a halfway shape opened at a predetermined angle with respect to the final shape to a final shape, wherein the lower surface part and one of the lower surface part are extended from one end and the lower mold in contact to the side surface portion, and the upper die abuts on one side of the upper surface portion, and the other side surface portion, in contact with the other side of the upper surface portion, a lower surface portion end of the other rotating the rotating type that can rotate, a the pivoting type the position in which a predetermined clearance as the pivot center Characterized in that comprising a rotating mechanism for.
Therefore, since the press direction can be converted into a rotation direction with an axis orthogonal to the press direction as a rotation center, the press forming apparatus can be downsized, and therefore, the press machine to be used can be small.
In addition, the other side surface portion which is extended from the other lower surface portion end by the rotation type and is formed in the middle shape opened by a predetermined angle with respect to the final shape, and the upper surface portion extended from the upper end of the other side surface portion. Since the rotating mold is rotated and molded while holding the other side portion, the lower surface end serving as the center of the rotation is surely a fold line, and can be accurately molded.
[0007]
Further, in the press molding apparatus according to claim 3 according to the present invention, the turning mechanism can turn the turning mold to a predetermined angle equal to or more than an angle at which the other side surface portion is closed to a final shape. It is characterized by that.
Therefore, the other side surface portion can be bent to an angle that anticipates the spring back in advance, so that it is not necessary to provide a correction step, and a molded product having a closed cross-sectional shape can be manufactured at low cost.
[0008]
In the press molding apparatus according to claim 4 of the present invention, the lower mold is in contact with the lower surface portion of the steel plate material and a part of one side surface portion extended from one lower surface portion end. The upper mold is in contact with the remaining portion of the one side surface portion of the steel sheet material and one side portion of the upper surface portion extending from the upper end of the one side surface portion.
Therefore, since the steel plate material is supported by the lower die on the two outer surfaces of the lower surface portion and a part of one side surface portion, it is easy to set the steel plate material on the lower die, and the remaining portion of the one side surface portion is also the upper die. And the two sides of the upper surface portion extending from the upper end of the one side surface portion, the steel plate material can be securely held before the final forming, and the accuracy during forming can be ensured.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of a press molding method and a press molding apparatus according to the present invention will be described below with reference to the drawings. A product molded by the press molding method and the press molding apparatus according to the present embodiment is a component of a frame of a vehicle seat.
Here, FIG. 1 is a view showing a steel plate material in a pre-bent state before applying the press forming method and press forming apparatus of the present invention, and FIG. 2 is a state in which the steel plate material is set in the press forming apparatus. It is a fragmentary sectional view of the press molding apparatus.
[0010]
(Constitution)
The structure of the press molding apparatus of this Embodiment is demonstrated.
In the press forming apparatus 10, the steel plate material is formed into the shape shown in FIGS. 6 to 8 described in the prior art, and the steel plate material 704 preliminarily bent into the shape shown in FIG. It is an apparatus which molds into. The “steel plate material 70” indicates a product formed into a final shape having a closed cross-sectional shape, and a shape in the middle of forming is referred to as a “steel plate material 704”. The left and right direction will be described below.
That is, the steel plate material 704 is a steel plate material 703 that is bent at a substantially right angle at a lower surface portion left end 76 that divides the lower surface portion 75 and the left side surface portion 73 (one side surface portion) shown in FIG. As shown in FIG. 1, a die in which a U-shaped groove having two corners on the bottom surface is formed so as to form a lower surface portion right end 77 that continuously separates the right surface portion 74 (the other side surface portion) from the lower surface portion 75. It is placed on 920, and the tip is pre-bent by pressing from above with a punch 930 having a similar shape to the U-shaped cross section of the die 920.
[0011]
As shown in FIGS. 2 to 4, the press forming apparatus 10 is extended from the lower surface portion 75 and the lower surface portion left end 76 (one lower surface portion end) of the steel plate material 704 when the steel plate material 704 is placed. The lower die 20 that supports the steel plate material 704 by contacting a part of the left side surface portion 73 below the left side surface portion 73, and the remaining portion above the left side surface portion 73 of the steel plate material 704 placed on the lower die 20 An upper die 30 that contacts the left side portion 71 of the upper surface portion extending in a direction parallel to the lower surface portion 75 from the upper end of the left side surface portion 73, and a lower surface portion of the steel plate material 704 placed on the lower die 20 A right side surface portion 74 extending from the right end 77 (the other bottom surface end) and a right side portion 72 of the upper surface portion extending in a direction perpendicular to the right side surface portion 74 from the upper end of the right side surface portion 74 Right side by rotating around the right end 77 4 a rotating mold 40 to bend and become a the pivoting type 40 from rotating mechanism 50 for rotating.
[0012]
As shown in FIGS. 3 and 4, the lower mold 20 has a substantially diamond-shaped cross section, abuts against the lower surface portion 75 of the steel plate material 704, and a substantially horizontal lower surface portion having a width substantially the same as the width of the lower surface portion 75. A receiving surface 212, a side surface receiving surface 211 that rises perpendicularly from the lower surface portion receiving surface 212 and contacts a part of the left side surface portion 73 below the left side surface portion 73 of the steel plate material 704, and the side surface receiving surface 211 A substantially horizontal upper end surface 214 continuous from an upper end by an inclined surface 213 facing upward in a direction opposite to the lower surface receiving surface 212; a vertical surface 215 depending from an end of the upper end surface 214 opposite to the inclined surface 213; A downwardly inclined surface 216 from the lower end of the vertical surface 215 toward the lower surface receiving surface 212, and a lower surface 217 that forms the lower surface receiving surface 212 and the holding portion 219 having a predetermined thickness from the downward inclined surface 216, , Upward from the end of the lower end surface 217 It is formed from a vertical surface 218 connected to the end of the lower surface receiving surface 212. Although not shown, the length in the direction perpendicular to the paper surface is longer than the length of the steel plate material 704 and protrudes from both ends of the steel plate material 704. And is supported by the base 60 via the lower mold legs.
[0013]
Note that the intersection of the lower surface receiving surface 212 and the vertical surface 218 of the lower mold 20 substantially coincides with the right end 77 of the lower surface of the steel plate material 704. It is designed to rotate.
Further, as shown in FIG. 3, the inclined surface 216 of the lower mold 20 is inclined so as to come into contact with the rotating mold 40 or have a slight gap before the rotating mold 40 is rotated. It is set to an angle.
[0014]
The upper die 30 is a block 31 having a substantially square cross section in which a triangular protrusion that engages with a triangular groove surrounded by the inclined surface 213 of the lower die 20 and the left side surface portion 73 of the steel plate material 704 is formed on the lower surface 317. Side surface pressing surface 311 that contacts the remaining portion of the side surface receiving surface 211 of the lower mold 20 of the left side surface portion 73 of the steel plate material 704 on the right side surface 313, and the side surface pressing surface 311, which protrudes rightward from the upper end of 311, and has a concave portion with an open cross section that is downwardly L-shaped by an upper surface pressing surface 312 that comes into contact with the left side 71 of the upper surface of the steel plate material 704 from the outside when the upper mold 30 is lowered. Is formed.
The upper surface 314 is a flat surface, is connected to a cylinder rod 302 provided in the upper mold ram 301, and is supported so as to protrude below the upper mold ram 301.
On the lower surface of the upper mold ram 301, a downward pressing piece 32 is attached in a protruding manner near the left side of the upper mold 30.
[0015]
Next, the rotary mold 40 has an L-shaped cross section that is substantially inverted in a side view and includes an upper L-shaped L-shaped block 41 and a lower side portion 42 below the L-shaped block 41. The left side surface 413 of the L-shaped block 41 is formed with a side surface placing surface 411 whose lower end is located in the vicinity of the lower surface portion right end 77 of the steel plate material 704, and leftward from the upper end of the side surface placing surface 411. An upside down L-shaped concave section is formed by an upper surface portion mounting surface 412 that abuts from the outside to the right side portion 72 of the upper surface portion of the steel sheet material 704 when the rotating mold 40 rotates. Yes.
A coil spring 59 is connected to the upper portion of the right side surface 414 on the back side of the left side surface 413 so as to constantly urge the rotary die 40 in the mold open state.
A lower side portion 42 extending in an L shape in the direction of the left side surface 413 is extended at a right angle slightly downward from the lower end of the side surface portion mounting surface 411, and the upper surface 421 of the lower side portion 42 and the side surface portion mounting surface 411 are extended. A groove portion 422 is formed between the lower end of the lower side portion 42 and is retracted in a direction opposite to the protruding direction of the lower side portion 42 to receive the holding portion 219 of the lower die 20 when the die is open.
In addition, although the rotation type | mold 40 of illustration is formed in the L shape combining the some block, you may comprise from one component.
[0016]
The rotation mechanism 50 includes a portion attached to the rotation mold 40 side and a portion attached to the base 60 side.
That is, on the rotating die 40 side, it is attached to the lower surface of the center of the lower side portion 42 of the rotating die 40 in the length direction (perpendicular to the paper surface), and the upper surface is attached to the lower surface of the lower side portion 42 in a planar shape. A guide roller 52 having a circular guide surface whose bottom surface is centered in the vicinity of the right end 77 of the bottom surface of the steel plate material 704, and attached to the bottom surface of the lower side portion 42 at a distance from the guide roller 52 in the longitudinal direction. A substantially square guide block 53 is provided, and a pressure receiving roller 51 supported via a bracket 511 is attached to the left end side of the lower side portion 42 of the guide block 53.
[0017]
On the other hand, on the base 60 side, a guide rail 54 having an arc-shaped cross section having a length substantially the same as that of the guide roller 52 and concentrically contacting the guide surface, and a lengthwise direction away from the guide rail 54 is provided. A guide plate 55 erected from the base 60 is attached between the front and rear of the guide block 53.
The guide block 53 and the guide plate 55 are rotated by inserting a guide pin 531 erected in the horizontal direction in the guide block 53 into an arcuate guide long hole 551 formed in the guide plate 55. The movable mold 40 side and the base 60 side are connected.
Further, the arcs of the guide roller 52, the guide rail 54, and the guide long hole 551 are formed by concentric circles around the vicinity of the right end 77 of the lower surface portion of the steel plate material 704.
[0018]
(Function)
A press forming method for forming the steel plate material 704 into a closed cross-sectional shape using the press forming apparatus 10 of the present embodiment configured as described above will be described.
First, as shown in FIG. 3, in the press molding apparatus 10, the upper die ram 301 is in the raised position, and the upper die 30 and the pressing piece 32 are also raised to the position indicated by the two-dot chain line. Therefore, the rotating die 40 is pulled by the tensile force of the coil spring 59, and the side surface placing surface 411 of the L-shaped block 41 is inclined and opened (die opening state).
A steel plate material 704 is formed on the lower mold 20 of the press-forming apparatus 10 in the mold open state. The lower mold 75 and the right side section 74 shown in FIG. The lower surface portion 75 is placed on the lower surface portion receiving surface 212 and the left side surface portion 73 is placed in contact with the side surface receiving surface 211.
At this time, the upper side of the left side surface portion 73 protrudes from the side surface portion receiving surface 211. Further, the right side surface portion 74 and the L-shaped block 41 are not in contact with each other.
[0019]
Next, while gradually lowering the upper mold ram 301, the cylinder that supports the upper mold 30 is simultaneously operated so that the upper mold 30 is first positioned on the lower mold 20, and the side surface pressing surface 311 of the upper mold 30 is The upper surface pressing surface 312 presses the remaining portion of the left side surface portion 73 protruding from the side surface receiving surface 211 of the lower die 20 and the left side portion 71 of the upper surface portion, thereby fixing the steel plate material 704 on the lower die 20. Hold on.
When the upper mold ram 301 is further lowered while maintaining the state where the upper mold 30 is pressing the steel plate material 704 on the lower mold 20, the pressing piece 32 attached to the upper mold ram 301 is also lowered, and the pressing When the lower end of the piece 32 comes into contact with the pressure receiving roller 51 and the upper die ram 301 is further lowered, the pressing piece 32 causes the rotary die 40 to move through the pressure receiving roller 51 with the vicinity of the right end 77 of the lower surface portion of the steel plate material 704 as the rotation center. The coil spring 59 is rotated counterclockwise while being pulled.
[0020]
That is, in the rotary die 40, the guide surface of the semicircular guide roller 52 attached to the lower surface of the lower side portion 42 is on the guide surface of the guide rail 54 attached to the base 60, and the vicinity of the right end 77 of the lower surface portion of the steel plate material 704. It rotates by sliding as a rotation center. At the same time, the guide pin 531 erected on the guide block 53 similarly rotates along the guide long hole 551 formed in the guide plate 55 with the vicinity of the lower end portion right end 77 of the steel plate material 704 as the rotation center.
As shown in FIG. 5, it is desirable to set the rotation center k at a position below the right end 77 of the lower surface portion of the steel plate material 704 by a gap t.
Then, the upper surface placing surface 412 can be set so that the upper surface portion placing surface 412 has a gap between the right side portion 72 of the upper surface portion and the gap m at the beginning of the rotation of the rotating die 40. Accordingly, the L-shaped block 41 and the right side surface portion 74 can be easily brought into contact with each other, and the upper surface portion mounting surface 412 abuts the right side portion 72 of the upper surface portion at the end of rotation of the rotation mold 40, so that the lower surface It is possible to bend with high accuracy without making the bent shape of the right end portion 77 loose.
[0021]
When the upper mold ram 301 is further lowered and the rotation mold 40 is rotated via the pressure receiving roller 51, the right side surface portion 74 is bent perpendicularly to the lower surface portion 75, resulting in the state shown in FIG. As shown in (B), the rotation mold 40 is further rotated counterclockwise by an angle θ and bent so that the upper surface portion right side portion 72 of the right side surface portion 74 overlaps the left side portion 71 of the upper surface portion. When the steel plate material 704 that has been pressed into a closed cross-sectional shape is taken out from the press processing apparatus 10, even if the right side surface portion 74 springs back, it does not open from the final shape, and a highly accurate closed cross-sectional shape is obtained. It is formed. In other words, the angle θ may be selected such that the right side surface 74 does not open from the final shape even when the right side surface 74 is caused to spring back.
[0022]
When the upper mold ram 301 is gradually raised after rotating the rotary mold 40 to the angle θ shown in FIG. 5B, the rotary mold 40 is in a state where the pressing piece 32 and the pressure receiving roller 51 are in contact with each other. 3B, the coil spring 59 is rotated clockwise until the upper surface 421 of the lower surface portion 42 of the rotating mold 40 comes into contact with the inclined surface 216 of the lower mold 20 due to the tensile force of the coil spring 59 to return to the mold open state of FIG.
Then, the upper mold ram 301 is further raised and the cylinder is operated to separate the upper mold 30 from the lower mold 20.
Thereafter, the steel sheet material 70 pressed into a closed cross-sectional shape is taken out from the rotary mold 40, and a series of press processes is completed.
[0023]
Thus, according to the press processing method and press processing apparatus of this embodiment, the left and right side surfaces 73 and 74 extend from the left and right ends of the lower surface 75, and the left side 71 of the upper surface is the upper end of the left side 73. A steel plate material 704 that is extended from the upper surface, the right side portion 72 of the upper surface portion is extended from the upper end of the right side surface portion 74, and the lower surface portion 75 and the right side surface portion 74 are formed in the middle of the predetermined shape with respect to the final shape. The lower mold 20 is in contact with the lower surface portion 75 and a part of the left side surface portion 73, and the upper mold 30 is in contact with the remaining portion of the left side surface portion 73 and the left side portion 71 of the upper surface portion. contact with the right side 72, right side surface to the lower surface portion 75 by rotating mold 40 to be rotated to a position in which a predetermined gap t below the lower surface portion right end 77 as the pivot center k by rotation mechanism 50 The final shape of closed cross-section by bending 74 Since such molded, it has become possible in a short time pressing products accurate closed section without using a core.
[0024]
In addition, this invention is not limited to the thing of the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the left and right side surfaces are shown as flat surfaces, but the present invention is not limited to this, and a configuration in which convex beads are formed on the outside is also possible.
In addition, although the left and right side portions of the upper surface portion are shown as being linear, they may be uneven.
[0025]
【The invention's effect】
The present invention is a press forming method for press forming a steel sheet material into a closed cross-sectional shape having an upper surface portion, a lower surface portion, and left and right side portions, and the both side surface portions are extended from both left and right ends of the lower surface portion, One side portion of the upper surface portion in the left-right direction extends from the upper end of the one side surface portion, the other side portion of the upper surface portion in the left-right direction extends from the upper end of the other side surface portion, and the lower surface portion A step of forming the other side surface portion into a halfway shape opened at a predetermined angle with respect to a final shape; the other side surface portion while pressing the outer surface of each portion; and the lower surface portion in which the other side surface portion is continuous with the lower surface portion. Since the press molding method includes a step of bending with a rotary mold that rotates about a position where a required gap is provided below the end as a rotation center, and forming into a final shape, a closed cross section within one stroke of the press Shaped product can be molded, press time Shortening of shortening and thus cycle time has become possible.
[0026]
Further, in a closed cross-sectional product having an upper surface portion, a lower surface portion, and left and right side portions, the both side surface portions are extended from the left and right ends of the lower surface portion, and one side portion of the upper surface portion in the left-right direction is the one side. Extending from the upper end of the side surface portion, the other side portion in the left-right direction of the upper surface portion is extended from the upper end of the other side surface portion, and the lower surface portion and the other side surface portion are at a predetermined angle with respect to the final shape A press molding apparatus for press-molding from an open halfway shape to a final shape, wherein the lower die is in contact with the lower surface portion and one side surface portion extended from one end of the lower surface portion, and one of the upper surface portions. the upper mold in contact with the side portion, and the other side surface portion, the contact with the other side portion of the upper surface portion, pivotable position having a predetermined gap on a lower surface portion end of the other as the pivot center Press forming apparatus comprising a rotating type and a rotating mechanism for rotating the rotating type. , It can reduce the size of the press-forming device, thus the press machine for use also has become possible to utilize a small size.
[Brief description of the drawings]
FIG. 1 is a diagram showing a steel sheet material in a pre-bent state before applying a press forming method and a press forming apparatus according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of the press forming apparatus in a state where a steel plate material is set in the press forming apparatus according to one embodiment of the present invention.
FIG. 3 is a cross-sectional view of the press forming apparatus in a state where a steel plate material is set in the press forming apparatus according to one embodiment of the present invention and the steel plate material is held by an upper mold and a lower mold.
FIG. 4 is a cross-sectional view of the press forming apparatus in a state where the forming of the steel sheet material by the press forming apparatus according to the embodiment of the present invention is completed.
FIGS. 5A and 5B are diagrams for explaining an operating state of the press molding apparatus according to the embodiment of the present invention, in which FIG. 5A shows a state before rotation of the rotation type, and FIG. It is a diagram of the state of the last end.
FIGS. 6A and 6B show a steel sheet material applied to a conventional press forming method according to an embodiment of the present invention after the punching process, in which FIG. 6A is a plan view and FIG. 6B is a side view.
FIGS. 7A and 7B are views of a steel plate material applied to a conventional press forming method according to an embodiment of the present invention, in which both sides of the upper surface are bent, (A) is a plan view, and (B) is a side view. It is.
FIG. 8 is a plan view of a steel plate material applied to a conventional press forming method according to one embodiment of the present invention with one side bent with respect to a bottom surface, (A) is a plan view; ) Is a side view.
FIG. 9 is a cross-sectional view of a press forming apparatus using a conventional core before the final process.
FIG. 10 is a sectional view of a final process of a press forming apparatus using a conventional core.
FIG. 11 is a side view of a press forming apparatus using a conventional core.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Press molding apparatus 20 Lower mold | type 30 Upper mold | type 301 Upper mold | type ram 40 Rotating type | mold 41 L-shaped block 42 Lower side part 50 Rotating mechanism 51 Pressure receiving roller 52 Guide roller 54 Guide rail 60 Base 70 Steel plate material 71 Left side part 72 of upper surface part Right side portion 73 of the upper surface portion Left side surface portion 74 Right side surface portion 75 Lower surface portion

Claims

A press forming method for press forming a steel plate material into a closed cross-sectional shape having an upper surface portion, a lower surface portion, and left and right side portions,
The both side surface portions extend from the left and right ends of the lower surface portion, the one side portion of the upper surface portion extends from the upper end of the one side surface portion, and the other side portion of the upper surface portion in the left and right direction Extending from the upper end of the other side surface, and forming the lower surface portion and the other side surface portion into a halfway shape opened at a predetermined angle with respect to the final shape;
A rotary type that rotates around the position where the other side surface portion is provided with a required gap below the lower surface end where the other side surface portion is connected to the lower surface portion while pressing the outer surface of each portion. A press molding method comprising: bending and molding into a final shape.

A product having a closed cross-sectional shape having an upper surface portion, a lower surface portion, and left and right side portions, the both side surface portions extend from both left and right ends of the lower surface portion, and one side portion of the upper surface portion in the left-right direction is the one side surface. The other side portion of the upper surface portion extends from the upper end of the other side surface portion, and the lower surface portion and the other side surface portion are opened at a predetermined angle with respect to the final shape. A press molding apparatus that press-forms from a midway shape to a final shape,
A lower mold that contacts the lower surface portion and one side surface portion extended from one end of the lower surface portion;
An upper mold that contacts one side of the upper surface part;
A pivoting type that is capable of pivoting around a position where the other side surface part and the other side part of the upper surface part are in contact with each other and a predetermined gap is provided at the other lower surface part end;
A rotation mechanism for rotating the rotation mold;
A press molding apparatus comprising:

In the press molding apparatus according to claim 2,
The press forming apparatus according to claim 1, wherein the rotating mechanism is configured such that the rotating mold can be rotated to a predetermined angle equal to or greater than an angle at which the other side surface portion is closed to a final shape.

In the press molding apparatus according to claim 2 or 3,
The lower mold abuts on the lower surface portion of the steel sheet material and a part of one side surface portion extended from one lower surface portion end,
The upper mold is in contact with the remaining portion of the one side surface portion of the steel sheet material and one side portion of the upper surface portion extending from the upper end of the one side surface portion. apparatus.