JP4668454B2 - Forming method for body panel - Google Patents

Forming method for body panel Download PDF

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JP4668454B2
JP4668454B2 JP2001133583A JP2001133583A JP4668454B2 JP 4668454 B2 JP4668454 B2 JP 4668454B2 JP 2001133583 A JP2001133583 A JP 2001133583A JP 2001133583 A JP2001133583 A JP 2001133583A JP 4668454 B2 JP4668454 B2 JP 4668454B2
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plate thickness
thickness portion
rolling
plate
body panel
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JP2002326589A (en
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卓 土屋
武司 佐野
正慎 沼野
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は板厚の異なるブランク材を用いた車体パネルの成形方法に関する。
【０００２】
【従来の技術】
板厚の異なる板材を製造する方法には、例えば、特開昭５９−２３２６１１号公報「板厚変更点トラッキング修正方法」に示されたものがある。同公報の第３頁左上欄第１５行〜同左下欄第１６行によれば、この板厚変更点トラッキング修正方法は次の通りである。ただし、以下の説明は原文の要約である。
圧延機３（符号は公報記載のものを流用した。以下同様。）の正転で正パス圧延し、逆転で逆パス圧延し、このような圧延を繰り返して板厚が異なる圧延材１（第２図）を形成する。その際に、ロール間隔の変更点が圧延機３の真下に到着したのを検出するとともに、調整し、板厚変更開始点のトラッキングを行う。
【０００３】
【発明が解決しようとする課題】
しかし、上記公報の方法では、正パス圧延ならびに逆パス圧延を行うために、圧延材１の圧延方向の長さにばらつきが生じやすい。長さのばらつきに伴い段差部の位置が左または右へ移動すると、後工程のプレス成形の際、圧延材１の段差部を金型の所定位置に一致させ難く、車体パネルの寸法精度は低下する。
【０００４】
そこで、本発明の目的は、車体パネルの寸法精度の向上を図るこができる車体パネルの成形方法を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成するために請求項１は、平板の一端から他端に向けて順に、第１板厚部、該第１板厚部よりも板厚が薄い第２板厚部を圧延装置で形成し、残りを第１板厚部よりも板厚が厚い第３板厚部として残し、平板をブランク材として用いてプレス機で所定の形状に成形する車体パネルの成形方法であって、平板を一方へ送りながら第１板厚部および第２板厚部を、第１板厚部の板厚ならびに第３板厚部の板厚との中間の板厚に圧延する第１圧延工程と、平板を他方へ送りながら第２板厚部の板厚に圧延する第２圧延工程と、第１板厚部ならびに第２板厚部の境界で圧延ロール間隔を第１板厚部の板厚用に設定し、この条件で平板を他方へ送りながら第１板厚部の板厚に圧延する第３圧延工程と、得られたブランク材をプレス機で所定の形状に成形する成形工程と、からなり、第１圧延工程では、第３板厚部の端を基準部とし、該基準部から所望の距離に第２板厚部と第３板厚部の境界となる第３板厚部の終端段差部を一端から終端段差部まで送って成形し、第２圧延工程では、基準部からの距離が第３板厚部の所望の距離より長い所望の距離に第１板厚部と第２板厚部の境界となる第２板厚部の終端段差部を、第３板厚部の終端段差部から一端へ向かって送って成形し、成形工程では、プレス機に取り付けたプレス金型の位置決め部に基準部を当ててプレス金型に載せることによって、プレス金型の型面の所定位置に第３板厚部の終端段差部ならびに第２板厚部の終端段差部を一致させた後、成形することを特徴とする。
【０００６】
第１圧延工程では、平板を一方へ送りながら、圧延装置の一方側へ中間の板厚に圧延した部分を出すので、圧延装置の他方側に残した平板を第３板厚部として使用すると、平板の他方の端の基準部から第３板厚部の終端までの長さを圧延方向の延びに関係することなく決定することができ、第３板厚部の長さの精度は向上する。
【０００７】
第２圧延工程では、第１圧延工程の完了位置でロールを逆回転させ、平板を他方へ送りながら、圧延装置の他方側に第２板厚部の範囲のみを第２板厚部の板厚に圧延して出し、基準部から第２板厚部の終端までの長さを決定する。従って、第２板厚部の長さを正確に確保するのは容易である。
【０００８】
成形工程では、第１〜第３圧延工程で形成したブランク材を用いるので、車体パネルの寸法精度は向上する。すなわち、プレス機の金型にブランク材をセットする際、基準部を用いて位置決めすると、金型の所定位置に第１板厚部、第２板厚部、第３板厚部を一致させることができ、塑性加工後の車体パネルの寸法精度は向上する。
【０００９】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。
図１は本発明に係る車体パネルの成形方法で製造したブランク材の正面図であり、ブランク材１０は、図の左側、一方１０ａから順に第１板厚部１１、第２板厚部１２、第３板厚部１３を形成し、一つの平板１４に３種類の異なる板厚を設けたものである。１５は、ブランク材１０の他方１０ｂの端に設けた基準部であるとともに、平板１４の基準部であり、ｔ１は第１板厚部１１の板厚、ｔ２は第２板厚部１２の板厚、ｔ３は第３板厚部１３の板厚である。
【００１０】
ここで、板厚の一例を示すと、例えば、第１板厚部１１の板厚ｔ１を１．２ｍｍとし、第２板厚部１２の板厚ｔ２を０．９ｍｍとし、第３板厚部１３の板厚ｔ３を２．３ｍｍとする。
【００１１】
図２は本発明に係る車体パネルの成形方法のフローチャートであり、ＳＴはステップを示す。
ＳＴ０１：平板を一方へ送りながら第１板厚部の板厚ならびに第３板厚部の板厚との中間の板厚に圧延する。
ＳＴ０２：平板を他方へ送りながら第２板厚部の板厚に圧延する。
ＳＴ０３：第１板厚部ならびに第２板厚部の境界で圧延ロール間隔を第１板厚部の板厚用に設定し、この条件で平板を他方へ送りながら第１板厚部の板厚に圧延する。
ＳＴ０４：得られたブランク材をプレス機で所定の形状に成形する。
次に、ＳＴ０１〜ＳＴ０４を具体的に説明する。
【００１２】
図３（ａ）〜（ｄ）は本発明に係る車体パネルの成形方法の第１説明図であり、圧延の模式図である。
（ａ）：まず、平板１４を圧延装置２１にセットする。具体的には、圧延装置２１は、上ワークロール２２と、下ワークロール２３と、圧延装置２１の一方側２１ａに設けた送りロール２４，２５と、他方側２１ｂに設けたガイドロール２６，２７ならびにスライド可能なクランプ手段３１と、図に示していない制御盤ならびに操作盤と、を有する。この操作盤で予め所望の圧延条件、例えば、圧延ロール間隔であるところのロールギャップをＧ１、上・下ワークロール２２，２３の回転数をＮに設定する。
【００１３】
その次に、圧延装置２１の他方側２１ｂに平板１４を二点鎖線で示すように載せるとともに、平板１４の一端３２をクランプ手段３１に通し、一端３２をガイドロール２７に載せる。そして、操作盤の所定ぼたんを「ＯＮ」にし、クランプ手段３１によって他端３３を把持した状態で、平板１４を矢印▲１▼の如く所定の速度Ｖで上・下ワークロール２２，２３へ送るとともに、ガイドロール２６，２７で一端３２を挟み、平板１４を案内する。なお、ガイドロール２６，２７を駆動させずに、従動としたが、ガイドロール２６，２７の構成は任意である。
【００１４】
（ｂ）：引き続き、第１圧延工程を開始し、平板１４を一方（矢印▲１▼の方向）へ送りながら第１板厚部１１ならびに第２板厚部１２を圧延する。詳細には、上・下ワークロール２２，２３に平板１４の一端３２を噛み込ませるとともに、圧延し、圧延装置２１の一方側２１ａに出てきた一端３２を送りロール２４，２５に通して支持しつつ、送り、第１板厚部１１の板厚ｔ１（図１参照）と第３板厚部１３の板厚ｔ３との中間の板厚ｔ４を形成し続け、上・下ワークロール２２，２３の回転軸心間に長さＬ１の終点３４が達した時点で送りを一旦止める。つまり、上・下ワークロール２２，２３の回転ならびにクランプ手段３１の送りを止める。
【００１５】
ここで、板厚ｔ４の一例を示すと、例えば、第１板厚部１１（図１参照）の板厚ｔ１を１．２ｍｍとし、第３板厚部１３の板厚ｔ３を２．３ｍｍとした場合、第１板厚部１１の板厚ｔ１と第３板厚部１３の板厚ｔ３との中間の板厚としての板厚ｔ４は、１．８ｍｍ程度にすればよい。
【００１６】
なお、長さＬ１を検出する手段は任意である。例えば、基準部１５を図に示していないセンサによって接触または非接触で直接検出してもよく、クランプ手段３１を直接検出してもよく、クランプ手段３１の送り量をセンサで計測してもよく、これらを組み合わせてもよい。
【００１７】
（ｃ）：続けて、第３板厚部１３の終端段差部１３ａを形成する。具体的には、長さＬ１の終点３４の位置で上ワークロール２２を矢印▲２▼の如く圧下し、ロールギャップをＧ２に変更することで、第３板厚部１３の終端段差部１３ａの形成が完了する。
【００１８】
このように、第１圧延工程では、平板１４を一方（矢印▲１▼の方向）へ送りながら第１板厚部１１および第２板厚部１２を、第１板厚部１１の板厚ｔ１ならびに第３板厚部１３の板厚ｔ３との中間の板厚ｔ４に圧延するので、圧延装置２１の他方側２１ｂに残した平板１４を第３板厚部１３として使用すると、一方側２１ａに出てきた板厚ｔ４の延びに関係することなく、基準部１５に対する第３板厚部１３の終端段差部１３ａの位置を検出することができ、第３板厚部１３の終端段差部１３ａの位置を正確に決定することができるとともに、第３板厚部１３の長さＬ１を正確に確保することができる。
【００１９】
（ｄ）：引き続き、第２圧延工程を開始し、平板１４を他方側２１ｂへ送りながら第２板厚部１２の板厚ｔ２に圧延する。詳しくは、ロールギャップＧ２の状態で上・下ワークロール２２，２３を逆に回転（矢印▲３▼，▲３▼の方向）させ、板厚ｔ２を形成するとともに、第２板厚部１２を形成しながら、クランプ手段３１で平板１４の他端３３を矢印▲４▼の如く引っ張りつつ、圧延を続ける。
【００２０】
図４（ａ）〜（ｄ）は本発明に係る車体パネルの成形方法の第２説明図であり、圧延の模式図である。
（ａ）：第２板厚部１２を完成させる。第２板厚部１２を他方側２１ｂへ送り出し、上・下ワークロール２２，２３の回転軸心間に長さＬ２の終点３５が達した時点で送りを一旦止める。つまり、板厚ｔ４から板厚ｔ２へ板厚を薄くし、長さＬ２の位置で第２板厚部１２が完成する。
【００２１】
このように第２圧延工では、平板１４を他方（矢印▲４▼の方向）へ送りながら第２板厚部１２の板厚ｔ２に圧延するので、他方側２１ｂに第２板厚部１２を出しつつ、基準部１５に対する第２板厚部１２の終端段差部１２ａの位置を検出することができ、第２板厚部１２の終端段差部１２ａの位置を正確に決定することができるとともに、第２板厚部１２の長さＬ２を正確に確保することができる。
【００２２】
また、第２圧延工程では、第１圧延工程で形成した板厚ｔ４を用いて板厚ｔ４をさらに板厚ｔ２まで薄くするので、第３板厚部１３の板厚ｔ３に対して高い圧下率を達成することができる。その結果、比較的小さな圧下荷重で高い圧下率を達成することがで、圧延装置の小型化を図ることができる。
【００２３】
（ｂ）：次いで、第３圧延工程を開始し、ロールギャップの変更を行う。つまり、一旦停止した状態で第１板厚部１１ならびに第２板厚部１２の境界としての終端段差部１２ａでロールギャップを第１板厚部１１の板厚ｔ１（図１参照）用に設定する。ここでは、上ワークロール２２を矢印▲５▼の如く上昇させ、ロールギャップをＧ３に設定した。
【００２４】
（ｃ）：続けて、第１板厚部１１を形成する。具体的には、ロールギャップＧ３の条件で平板１４を他方（矢印▲４▼の方向）へ送りながら第１板厚部１１の板厚ｔ１に圧延する。つまり、板厚ｔ４から板厚ｔ１へ板厚を薄くする。
【００２５】
（ｄ）：引き続き、平板１４を他方側２１ｂへ送り、ロールギャップＧ３の上・下ワークロール２２，２３から第１板厚部１１を全て送り出して第１板厚部１１を完成させると、ブランク材１０は完成する。そして、完成したブランク材１０を圧延装置２１から取り出し、次工程の成形工程へ搬送する。
【００２６】
図５は本発明に係る車体パネルの成形方法の第３説明図であり、ブランク材１０の基準部１５から長さＬ１で第３板厚部１３の終端段差部１３ａを形成し、基準部１５から長さＬ２で第２板厚部１２の終端段差部１２ａを形成したことを示し、また、このブランク材１０を次工程の成形工程で成形する際には、基準部１５を二点鎖線で示す位置決め部３６，３６に矢印▲６▼，▲６▼の如く当てて、ブランク材１０をセットすることを示す。
【００２７】
図６は本発明に係る車体パネルの成形方法の第４説明図であり、プレス成形の一例を示す模式図である。
次に、成形工程を開始し、ブランク材１０をプレス機４１で所定の形状に成形する。具体的には、プレス機４１に取り付けたプレス金型４２（上金型４２ａ、下金型４２ｂ、型面４２ｃ，４２ｃ）の位置決め部３６にブランク材１０の基準部１５を矢印▲６▼の如く当てながら、下金型４２ｂに載せる。その後、上金型４２ａを下降させてブランク材１０を所定の形状に成形して、所定の車体パネル４３を得る。若しくは、さらにプレス成形を続けて所定の車体パネルを得る。
【００２８】
このようにブランク材１０を成形する成形工程では、基準部１５をプレス金型４２の位置決め部３６に当てると、プレス金型４２の型面４２ｃ，４２ｃの所定位置に第３板厚部１３の終端段差部１３ａならびに第２板厚部１２の終端段差部１２ａを正確に一致させることができ、車体パネルの寸法精度の向上を図るこができる。
すなわち、前工程の第１〜第３圧延工程で基準部１５からの長さＬ１およびＬ２を正確に確保し同時に、基準部１５に対する終端段差部１３ａの位置ならびに終端段差部１２ａの位置を正確に決定したので、塑性加工後の車体パネルの寸法精度の向上を図るこができる。
【００２９】
尚、本発明の実施の形態に示した図１のブランク材１０では、板厚をｔ１，ｔ２，ｔ３の３種類としたが、３種類に限定するものではない。
車体パネルの成形方法に用いた圧延装置２１、プレス機４１、プレス金型４２の各々の構成は一例である。
【００３０】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１では、車体パネルの成形方法は、平板を一方へ送りながら第１板厚部および第２板厚部を、第１板厚部の板厚ならびに第３板厚部の板厚との中間の板厚に圧延する第１圧延工程と、平板を他方へ送りながら第２板厚部の板厚に圧延する第２圧延工程と、第１板厚部ならびに第２板厚部の境界で圧延ロール間隔を第１板厚部の板厚用に設定し、この条件で平板を他方へ送りながら第１板厚部の板厚に圧延する第３圧延工程と、得られたブランク材をプレス機で所定の形状に成形する成形工程と、からなり、第１圧延工程では、第３板厚部の端を基準部とし、該基準部から所望の距離に第２板厚部と第３板厚部の境界となる第３板厚部の終端段差部を一端から終端段差部まで送って成形し、第２圧延工程では、基準部からの距離が第３板厚部の所望の距離より長い所望の距離に第１板厚部と第２板厚部の境界となる第２板厚部の終端段差部を、第３板厚部の終端段差部から一端へ向かって送って成形し、成形工程では、プレス機に取り付けたプレス金型の位置決め部に基準部を当ててプレス金型に載せることによって、プレス金型の型面の所定位置に第３板厚部の終端段差部ならびに第２板厚部の終端段差部を一致させた後、成形する。
第１圧延工程では、平板を一方へ送りながら、圧延装置の一方側へ中間の板厚に圧延した部分を出すので、圧延装置の他方側に残した平板を第３板厚部として使用すると、平板の他方の端の基準部から第３板厚部の終端までの長さを圧延方向の延びに関係することなく決定することができる。従って、第３板厚部の長さを正確に確保することができるとともに、第３板厚部の終端段差部の位置を正確に決定することができる。
【００３１】
第２圧延工程では、第１圧延工程の完了位置でロールを逆回転させ、平板を、第３板厚部の終端段差部から一端へ向かって送りながら、圧延装置の他方側に第２板厚部の範囲のみを第２板厚部の板厚に圧延して出し、基準部から第２板厚部の終端までの長さを決定する。従って、第２板厚部の長さを正確に確保することができるとともに、第２板厚部の終端段差部の位置を正確に決定することができる。
【００３２】
また、第２圧延工程では、第１圧延工程で形成した中間の板厚をより薄い第２板厚部の板厚に圧延するので、第３板厚部の板厚に対して高い圧下率を達成することができる。その結果、比較的小さな圧下荷重で高圧下率を得ることができ、圧延装置の小型化を図ることができる。
【００３３】
成形工程では、前工程の第１〜第３圧延工程で製造したブランク材を用いるので、車体パネルの寸法精度の向上を図るこができる。すなわち、プレス機の金型にブランク材をセットする際、基準部を用いて位置決めすると、金型の所定位置に第１板厚部、第２板厚部、第３板厚部を一致させることができ、塑性加工後の車体パネルの寸法精度の向上を図るこができる。
【図面の簡単な説明】
【図１】本発明に係る車体パネルの成形方法で製造したブランク材の正面図
【図２】本発明に係る車体パネルの成形方法のフローチャート
【図３】本発明に係る車体パネルの成形方法の第１説明図
【図４】本発明に係る車体パネルの成形方法の第２説明図
【図５】本発明に係る車体パネルの成形方法の第３説明図
【図６】本発明に係る車体パネルの成形方法の第４説明図
【符号の説明】
１０…ブランク材、１１…第１板厚部、１２…第２板厚部、１２ａ…境界（第２板厚部の終端段差部）、１３…第３板厚部、１４…平板、２１…圧延装置、４１…プレス機、４３…車体パネル、Ｇ１，Ｇ２，Ｇ３…圧延ロール間隔（ロールギャップ）、ｔ１…第１板厚部の板厚、ｔ２…第２板厚部の板厚、ｔ３…第３板厚部の板厚、ｔ４…第１板厚部の板厚ならびに第３板厚部の板厚との中間の板厚。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for forming a vehicle body panel using blanks having different thicknesses.
[0002]
[Prior art]
As a method of manufacturing plate materials having different plate thicknesses, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. 59-232611 “Method for correcting plate thickness change point tracking”. According to the third page of the upper left column, line 15 to the lower left column, line 16 of the publication, the method for correcting the thickness change point tracking is as follows. However, the following explanation is a summary of the original text.
Rolling machine 1 (the sign is the same as that described in the official gazette, the same applies hereinafter) is forward-pass rolled by forward rotation and reverse-pass rolling by reverse rotation. 2 figure). At that time, it is detected that the change point of the roll interval has arrived just below the rolling mill 3, and the adjustment is performed to track the start point of the plate thickness change.
[0003]
[Problems to be solved by the invention]
However, in the method of the above publication, since the forward pass rolling and the reverse pass rolling are performed, the length of the rolled material 1 in the rolling direction tends to vary. If the position of the stepped portion moves to the left or right as the length varies, it is difficult to match the stepped portion of the rolled material 1 to the predetermined position of the mold during press forming in the subsequent process, and the dimensional accuracy of the vehicle body panel decreases. To do.
[0004]
Therefore, an object of the present invention is to provide a method for forming a vehicle body panel that can improve the dimensional accuracy of the vehicle body panel.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, in order from one end of the flat plate to the other end, the first plate thickness portion and the second plate thickness portion whose thickness is thinner than the first plate thickness portion are obtained by a rolling mill. A method for forming a vehicle body panel comprising forming a plate, leaving the rest as a third plate thicker portion thicker than the first plate thick portion, and forming the plate into a predetermined shape with a press using a flat plate as a blank material. Rolling the first plate thickness portion and the second plate thickness portion to a plate thickness intermediate between the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion, while feeding The second rolling step of rolling to a plate thickness of the second plate thickness part while feeding the flat plate to the other, and the rolling roll interval at the boundary between the first plate thickness portion and the second plate thickness portion for the plate thickness of the first plate thickness portion And a third rolling step of rolling to a plate thickness of the first plate thickness portion while feeding a flat plate to the other under these conditions, and the obtained blank material with a press machine A first rolling step, with the end of the third plate thickness portion as a reference portion and a boundary between the second plate thickness portion and the third plate thickness portion at a desired distance from the reference portion. In the second rolling process, the distance from the reference part is longer than the desired distance of the third plate thickness part, and the final step part of the third plate thickness part is formed from one end to the end step part. The terminal step portion of the second plate thickness portion, which is the boundary between the first plate thickness portion and the second plate thickness portion, is formed by feeding from the terminal step portion of the third plate thickness portion toward one end. By placing the reference part on the positioning part of the press die attached to the machine and placing it on the press die, the end step part of the third plate thickness part and the second plate thickness part are placed at predetermined positions on the die surface of the press die. Molding is performed after the end stepped portions are matched.
[0006]
In the first rolling step, while feeding the flat plate to one side, the portion rolled to an intermediate plate thickness is given to one side of the rolling device, so when using the flat plate left on the other side of the rolling device as the third plate thickness portion, The length from the reference portion at the other end of the flat plate to the end of the third plate thickness portion can be determined regardless of the extension in the rolling direction, and the accuracy of the length of the third plate thickness portion is improved.
[0007]
In the second rolling step, the roll is reversely rotated at the completion position of the first rolling step, and the plate is fed to the other side, while only the range of the second thickness portion is placed on the other side of the rolling device. The length from the reference portion to the end of the second plate thickness portion is determined. Therefore, it is easy to ensure the length of the second plate thickness portion accurately.
[0008]
Since the blank material formed in the first to third rolling steps is used in the forming step, the dimensional accuracy of the vehicle body panel is improved. That is, when the blank material is set on the die of the press machine, if the positioning is performed using the reference portion, the first plate thickness portion, the second plate thickness portion, and the third plate thickness portion are made to coincide with a predetermined position of the die. The dimensional accuracy of the vehicle body panel after plastic working is improved.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a front view of a blank material manufactured by a method for forming a vehicle body panel according to the present invention. A blank material 10 includes a first plate thickness portion 11, a second plate thickness portion 12, The third plate thickness portion 13 is formed, and three different plate thicknesses are provided on one flat plate 14. Reference numeral 15 denotes a reference portion provided at the end of the other 10 b of the blank member 10, and a reference portion of the flat plate 14, t 1 is a plate thickness of the first plate thickness portion 11, and t 2 is a plate of the second plate thickness portion 12. The thickness, t3, is the plate thickness of the third plate thickness portion 13.
[0010]
Here, as an example of the plate thickness, for example, the plate thickness t1 of the first plate thickness portion 11 is 1.2 mm, the plate thickness t2 of the second plate thickness portion 12 is 0.9 mm, and the third plate thickness portion The plate thickness t3 of 13 is set to 2.3 mm.
[0011]
FIG. 2 is a flowchart of a method for forming a vehicle body panel according to the present invention, and ST indicates a step.
ST01: While feeding the flat plate to one side, it is rolled to a plate thickness intermediate between the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion.
ST02: Rolling to the thickness of the second thickness portion while feeding the flat plate to the other side.
ST03: The rolling roll interval is set for the plate thickness of the first plate thickness portion at the boundary between the first plate thickness portion and the second plate thickness portion, and the plate thickness of the first plate thickness portion is sent to the other side under this condition. To roll.
ST04: The obtained blank is formed into a predetermined shape with a press.
Next, ST01 to ST04 will be specifically described.
[0012]
FIGS. 3A to 3D are first explanatory views of a method for forming a vehicle body panel according to the present invention, and are schematic diagrams of rolling.
(A): First, the flat plate 14 is set in the rolling device 21. Specifically, the rolling device 21 includes an upper work roll 22, a lower work roll 23, feed rolls 24 and 25 provided on one side 21a of the rolling device 21, and guide rolls 26 and 27 provided on the other side 21b. And a slidable clamp means 31 and a control panel and operation panel not shown in the figure. In this operation panel, a desired rolling condition, for example, a roll gap which is a rolling roll interval is set to G1, and the rotation speeds of the upper and lower work rolls 22 and 23 are set to N.
[0013]
Next, the flat plate 14 is placed on the other side 21 b of the rolling device 21 as indicated by a two-dot chain line, one end 32 of the flat plate 14 is passed through the clamping means 31, and one end 32 is placed on the guide roll 27. Then, with the predetermined button of the operation panel set to “ON” and the other end 33 being gripped by the clamping means 31, the flat plate 14 is sent to the upper and lower work rolls 22, 23 at a predetermined speed V as indicated by the arrow (1). At the same time, the one end 32 is sandwiched between the guide rolls 26 and 27 to guide the flat plate 14. Although the guide rolls 26 and 27 are driven without being driven, the configuration of the guide rolls 26 and 27 is arbitrary.
[0014]
(B): Subsequently, the first rolling step is started, and the first plate thickness portion 11 and the second plate thickness portion 12 are rolled while feeding the flat plate 14 in one direction (the direction of arrow (1)). More specifically, the upper and lower work rolls 22 and 23 are engaged with the one end 32 of the flat plate 14 and rolled, and the one end 32 coming out on one side 21a of the rolling device 21 is passed through the feed rolls 24 and 25 to be supported. However, the feed continues to form an intermediate plate thickness t4 between the plate thickness t1 of the first plate thickness portion 11 (see FIG. 1) and the plate thickness t3 of the third plate thickness portion 13, and the upper and lower work rolls 22, When the end point 34 of the length L1 reaches between the 23 rotation axes, the feeding is temporarily stopped. That is, the rotation of the upper and lower work rolls 22 and 23 and the feeding of the clamping means 31 are stopped.
[0015]
Here, as an example of the plate thickness t4, for example, the plate thickness t1 of the first plate thickness portion 11 (see FIG. 1) is 1.2 mm, and the plate thickness t3 of the third plate thickness portion 13 is 2.3 mm. In this case, the plate thickness t4 as the intermediate plate thickness between the plate thickness t1 of the first plate thickness portion 11 and the plate thickness t3 of the third plate thickness portion 13 may be about 1.8 mm.
[0016]
The means for detecting the length L1 is arbitrary. For example, the reference unit 15 may be detected directly or non-contacted by a sensor not shown in the drawing, the clamp means 31 may be directly detected, and the feed amount of the clamp means 31 may be measured by the sensor. These may be combined.
[0017]
(C): Subsequently, the terminal step 13a of the third plate thickness portion 13 is formed. Specifically, the upper work roll 22 is squeezed down as indicated by arrow {circle around (2)} at the position of the end point 34 of the length L1, and the roll gap is changed to G2, whereby the end step portion 13a of the third plate thickness portion 13 is changed. Formation is complete.
[0018]
Thus, in the first rolling step, the first plate thickness portion 11 and the second plate thickness portion 12 are changed to the plate thickness t1 of the first plate thickness portion 11 while feeding the flat plate 14 in one direction (in the direction of arrow (1)). In addition, since rolling is performed to an intermediate plate thickness t4 with the plate thickness t3 of the third plate thickness portion 13, if the flat plate 14 left on the other side 21b of the rolling device 21 is used as the third plate thickness portion 13, the one side 21a The position of the terminal step portion 13a of the third plate thickness portion 13 with respect to the reference portion 15 can be detected regardless of the extension of the plate thickness t4 that has come out, and the terminal step portion 13a of the third plate thickness portion 13 can be detected. While being able to determine a position correctly, the length L1 of the 3rd board thickness part 13 can be ensured correctly.
[0019]
(D): Subsequently, the second rolling step is started, and the plate 14 is rolled to the plate thickness t2 of the second plate thickness portion 12 while being fed to the other side 21b. Specifically, the upper and lower work rolls 22 and 23 are rotated reversely (in the directions of arrows (3) and (3)) in the state of the roll gap G2 to form a plate thickness t2, and the second plate thickness portion 12 is While forming, the clamping means 31 pulls the other end 33 of the flat plate 14 as indicated by the arrow (4) and continues rolling.
[0020]
4 (a) to 4 (d) are second explanatory views of a method for forming a vehicle body panel according to the present invention, and are schematic diagrams of rolling.
(A): The second plate thickness portion 12 is completed. The second plate thickness portion 12 is fed out to the other side 21b, and the feeding is temporarily stopped when the end point 35 of the length L2 reaches between the rotation axes of the upper and lower work rolls 22 and 23. That is, the plate thickness is reduced from the plate thickness t4 to the plate thickness t2, and the second plate thickness portion 12 is completed at the position of the length L2.
[0021]
In this way, in the second rolling mill, the flat plate 14 is rolled to the thickness t2 of the second plate thickness portion 12 while feeding the other plate (in the direction of arrow (4)), so the second plate thickness portion 12 is provided on the other side 21b. While taking out, it is possible to detect the position of the terminal step portion 12a of the second plate thickness portion 12 with respect to the reference portion 15, and to accurately determine the position of the terminal step portion 12a of the second plate thickness portion 12, The length L2 of the second plate thickness portion 12 can be accurately ensured.
[0022]
In the second rolling step, the plate thickness t4 is further reduced to the plate thickness t2 using the plate thickness t4 formed in the first rolling step, so that the reduction ratio is higher than the plate thickness t3 of the third plate thickness portion 13. Can be achieved. As a result, a high rolling reduction can be achieved with a relatively small rolling load, and the rolling apparatus can be downsized.
[0023]
(B): Next, the third rolling step is started and the roll gap is changed. That is, the roll gap is set for the plate thickness t1 (see FIG. 1) of the first plate thickness portion 11 at the terminal step portion 12a as the boundary between the first plate thickness portion 11 and the second plate thickness portion 12 in the stopped state. To do. Here, the upper work roll 22 was raised as shown by arrow (5), and the roll gap was set to G3.
[0024]
(C): Subsequently, the first plate thickness portion 11 is formed. Specifically, the flat plate 14 is rolled to the thickness t1 of the first thickness portion 11 while feeding the flat plate 14 to the other side (in the direction of arrow (4)) under the condition of the roll gap G3. That is, the plate thickness is reduced from the plate thickness t4 to the plate thickness t1.
[0025]
(D): Subsequently, when the flat plate 14 is sent to the other side 21b and the first plate thickness portion 11 is completely sent out from the upper and lower work rolls 22 and 23 of the roll gap G3, the first plate thickness portion 11 is completed. The material 10 is completed. Then, the completed blank 10 is taken out from the rolling device 21 and conveyed to the next forming step.
[0026]
FIG. 5 is a third explanatory view of a method for forming a vehicle body panel according to the present invention, wherein a terminal step portion 13a of the third plate thickness portion 13 is formed with a length L1 from the reference portion 15 of the blank 10 and the reference portion 15 is formed. It shows that the terminal step part 12a of the second plate thickness part 12 is formed with the length L2, and when the blank material 10 is formed in the next forming process, the reference part 15 is indicated by a two-dot chain line. This indicates that the blank 10 is set by being applied to the positioning portions 36 and 36 as shown by arrows (6) and (6).
[0027]
FIG. 6 is a fourth explanatory view of the vehicle body panel molding method according to the present invention, and is a schematic diagram showing an example of press molding.
Next, a forming process is started, and the blank material 10 is formed into a predetermined shape by the press machine 41. Specifically, the reference portion 15 of the blank 10 is moved to the positioning portion 36 of the press die 42 (upper die 42a, lower die 42b, die surfaces 42c, 42c) attached to the press machine 41 by the arrow (6). Put it on the lower mold 42b. Thereafter, the upper mold 42a is lowered to form the blank material 10 into a predetermined shape, and a predetermined vehicle body panel 43 is obtained. Alternatively, press molding is continued to obtain a predetermined vehicle body panel.
[0028]
Thus, in the molding process for molding the blank material 10, when the reference portion 15 is applied to the positioning portion 36 of the press die 42, the third plate thickness portion 13 is placed at a predetermined position on the mold surfaces 42 c and 42 c of the press die 42. The end step portion 13a and the end step portion 12a of the second plate thickness portion 12 can be accurately matched, and the dimensional accuracy of the vehicle body panel can be improved.
That is, the lengths L1 and L2 from the reference portion 15 are accurately ensured in the first to third rolling steps of the previous step, and at the same time, the position of the terminal step portion 13a and the position of the terminal step portion 12a with respect to the reference portion 15 are accurately determined. Since it is determined, it is possible to improve the dimensional accuracy of the body panel after plastic working.
[0029]
In the blank 10 of FIG. 1 shown in the embodiment of the present invention, the plate thicknesses are three types of t1, t2, and t3, but are not limited to three types.
Each structure of the rolling device 21, the press 41, and the press die 42 used in the method for forming the vehicle body panel is an example.
[0030]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to a first aspect of the present invention, there is provided a method for forming a vehicle body panel, wherein the first plate thickness portion and the second plate thickness portion are set to the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion while feeding the flat plate to one side. At the boundary between the first rolling step for rolling to an intermediate plate thickness, the second rolling step for rolling to a plate thickness of the second plate thickness portion while feeding a flat plate to the other, and the boundary between the first plate thickness portion and the second plate thickness portion The rolling roll interval is set for the plate thickness of the first plate thickness portion, and the blank material obtained is pressed in the third rolling step for rolling to the plate thickness of the first plate thickness portion while feeding the flat plate to the other under this condition. And forming a predetermined shape with a machine. In the first rolling process, the end of the third plate thickness portion is used as a reference portion, and the second plate thickness portion and the third plate are placed at a desired distance from the reference portion. the termination step of the third thickness portion bounding the thick portion molding sent from one end to the end step portion, the second rolling process, the distance from the reference portion is the third plate The first thickness portion and the end step portion of the second thickness portion at the boundary of the second thickness portion to the long desired distance from the desired distance parts, toward one end from the end step portion of the third thickness portion In the molding process, the third plate thickness portion is placed at a predetermined position on the die surface of the press die by placing the reference portion on the positioning portion of the press die attached to the press machine and placing it on the press die. After the end stepped portion of the second plate and the end stepped portion of the second plate thickness portion are matched, molding is performed.
In the first rolling step, while feeding the flat plate to one side, the portion rolled to an intermediate plate thickness is given to one side of the rolling device, so when using the flat plate left on the other side of the rolling device as the third plate thickness portion, The length from the reference portion at the other end of the flat plate to the end of the third plate thickness portion can be determined regardless of the extension in the rolling direction. Therefore, the length of the third plate thickness portion can be ensured accurately, and the position of the terminal step portion of the third plate thickness portion can be accurately determined.
[0031]
In the second rolling step, the roll is reversely rotated at the completion position of the first rolling step, and the second plate thickness is transferred to the other side of the rolling device while feeding the flat plate from the terminal step portion of the third plate thickness portion toward one end . Only the range of the portion is rolled out to the plate thickness of the second plate thickness portion, and the length from the reference portion to the end of the second plate thickness portion is determined. Accordingly, the length of the second plate thickness portion can be ensured accurately, and the position of the terminal step portion of the second plate thickness portion can be accurately determined.
[0032]
Further, in the second rolling step, the intermediate plate thickness formed in the first rolling step is rolled to a plate thickness of the thinner second plate thickness portion, so that a high reduction ratio is obtained with respect to the plate thickness of the third plate thickness portion. Can be achieved. As a result, a high pressure reduction ratio can be obtained with a relatively small reduction load, and the rolling apparatus can be downsized.
[0033]
In the molding process, since the blank material manufactured in the first to third rolling processes of the previous process is used, the dimensional accuracy of the vehicle body panel can be improved. That is, when the blank material is set on the die of the press machine, if the positioning is performed using the reference portion, the first plate thickness portion, the second plate thickness portion, and the third plate thickness portion are made to coincide with a predetermined position of the die. Thus, the dimensional accuracy of the body panel after plastic working can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a blank produced by a method for forming a vehicle body panel according to the present invention. FIG. 2 is a flowchart of a method for forming a vehicle body panel according to the present invention. FIG. 4 is a second explanatory view of a vehicle body panel forming method according to the present invention. FIG. 5 is a third explanatory view of a vehicle body panel forming method according to the present invention. FIG. 6 is a vehicle body panel according to the present invention. 4th explanatory diagram of the molding method
DESCRIPTION OF SYMBOLS 10 ... Blank material, 11 ... 1st board thickness part, 12 ... 2nd board thickness part, 12a ... Boundary (terminal step part of 2nd board thickness part), 13 ... 3rd board thickness part, 14 ... Flat plate, 21 ... Rolling apparatus, 41 ... press machine, 43 ... body panel, G1, G2, G3 ... rolling roll interval (roll gap), t1 ... plate thickness of first plate thickness portion, t2 ... plate thickness of second plate thickness portion, t3 ... the plate thickness of the third plate thickness portion, t4 ... the plate thickness intermediate between the plate thickness of the first plate thickness portion and the plate thickness of the third plate thickness portion.

Claims (1)

平板（１４）の一端（３２）から他端（３３）に向けて順に、第１板厚部（１１）、該第１板厚部（１１）よりも板厚が薄い第２板厚部（１２）を圧延装置で形成し、残りを前記第１板厚部（１１）よりも板厚が厚い第３板厚部（１３）として残し、
前記平板（１４）をブランク材（１０）として用いてプレス機（４１）で所定の形状に成形する車体パネルの成形方法であって、
前記平板（１４）を一方へ送りながら前記第１板厚部（１１）および前記第２板厚部（１２）を、前記第１板厚部（１１）の板厚ならびに前記第３板厚部（１３）の板厚との中間の板厚（ｔ４）に圧延する第１圧延工程と、
前記平板（１４）を他方へ送りながら前記第２板厚部（１２）の板厚（ｔ２）に圧延する第２圧延工程と、
前記第１板厚部（１１）ならびに前記第２板厚部（１２）の境界（１２ａ）で圧延ロール間隔を前記第１板厚部（１１）の板厚用に設定し、この条件で前記平板（１４）を他方へ送りながら前記第１板厚部（１１）の板厚（ｔ１）に圧延する第３圧延工程と、
得られた前記ブランク材（１０）を前記プレス機（４１）で所定の形状に成形する成形工程と、からなり、
前記第１圧延工程では、前記第３板厚部（１３）の端を基準部（１５）とし、該基準部（１５）から所望の距離（Ｌ１）に前記第２板厚部（１２）と前記第３板厚部（１３）の境界となる前記第３板厚部（１３）の終端段差部（１３ａ）を前記一端（３２）から前記終端段差部（１３ａ）まで送って成形し、
前記第２圧延工程では、前記基準部（１５）からの距離が前記第３板厚部（１３）の前記所望の距離（Ｌ１）より長い所望の距離（Ｌ２）に前記第１板厚部（１１）と前記第２板厚部（１２）の前記境界となる前記第２板厚部（１２）の終端段差部（１２ａ）を、前記第３板厚部（１３）の終端段差部（１３ａ）から前記一端（３２）へ向かって送って成形し、
前記成形工程では、前記プレス機（４１）に取り付けたプレス金型（４２）の位置決め部（３６）に前記基準部（１５）を当てて前記プレス金型（４２）に載せることによって、前記プレス金型（４２）の型面（４２ｃ，４２ｃ）の所定位置に前記第３板厚部（１３）の前記終端段差部（１３ａ）ならびに前記第２板厚部（１２）の前記終端段差部（１２ａ）を一致させた後、成形することを特徴とする車体パネルの成形方法。In order from one end (32) to the other end (33) of the flat plate (14) , the first plate thickness portion (11) and the second plate thickness portion ( thickness smaller than the first plate thickness portion (11)) ( 12) is formed by a rolling device, and the rest is left as a third plate thickness portion (13) having a plate thickness greater than that of the first plate thickness portion (11) ,
A method of forming a vehicle body panel using the flat plate (14) as a blank material (10) and forming it into a predetermined shape with a press machine (41) ,
While feeding the flat plate (14) to one side, the first plate thickness portion (11) and the second plate thickness portion (12) are changed to the plate thickness of the first plate thickness portion (11) and the third plate thickness portion. A first rolling step of rolling to a thickness (t4) intermediate to the thickness of (13) ;
A second rolling step of rolling to the plate thickness (t2) of the second plate thickness portion (12) while feeding the flat plate (14) to the other;
The rolling roll interval is set for the thickness of the first plate thickness portion (11) at the boundary (12a) between the first plate thickness portion (11) and the second plate thickness portion (12) , A third rolling step of rolling to the plate thickness (t1) of the first plate thickness portion (11) while feeding the flat plate (14) to the other;
A molding step of molding the obtained blank material (10) into a predetermined shape with the press machine (41) ,
In the first rolling step, an end of the third plate thickness portion (13) is used as a reference portion (15), and the second plate thickness portion (12) and a desired distance (L1) from the reference portion (15). The terminal step portion (13a) of the third plate thickness portion (13) that becomes the boundary of the third plate thickness portion (13) is sent from the one end (32) to the terminal step portion (13a) and molded,
In the second rolling step, the first plate thickness portion ( L2) has a distance from the reference portion (15) that is longer than the desired distance (L1) of the third plate thickness portion (13). 11) and the terminal step portion (12a) of the second plate thickness portion (12) , which is the boundary between the second plate thickness portion (12) , and the terminal step portion (13a) of the third plate thickness portion (13). ) Toward the one end (32) and molded,
In the molding step, the press portion (15) is placed on the press die (42) by placing the reference portion (15) against the positioning portion (36) of the press die (42) attached to the press machine (41). mold surface (42c, 42c) said end step portion of the at a predetermined position the third thickness portion the end step portion of (13) (13a) and the second thickness portion (12) of the mold (42) ( 12. A method for forming a vehicle body panel, characterized by forming after matching 12a) .
JP2001133583A 2001-04-27 2001-04-27 Forming method for body panel Expired - Fee Related JP4668454B2 (en)

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