JP2005028370A

JP2005028370A - Negative angle forming die

Info

Publication number: JP2005028370A
Application number: JP2003193018A
Authority: JP
Inventors: Teruhisa Niikuma; 輝久新熊
Original assignee: Umix Co Ltd
Current assignee: Umix Co Ltd
Priority date: 2003-07-07
Filing date: 2003-07-07
Publication date: 2005-02-03
Anticipated expiration: 2023-07-07
Also published as: JP3773922B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a negative angle forming die with which entering work is made possible without increasing a press die even in such a work shape as a part where an entering like a U-shaped groove interferes with a rotary cam in a entering work. <P>SOLUTION: In this negative angle forming die, in the case a rotary cam 7 which is retreated during rotation interferes with the part of the work where the entering is formed after the entering is formed, a slider 18 is formed by dividing a part of of the rotary cam of the entered groove part freely movably in the direction orthogonal to the sliding direction of a slide cam 12, and the entering forming part of the slide cam is advanced after forming the entered groove by bringing the drive plate 19 of the slide cam into contact with the bottom of the slider to perform the entering work. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、金属製薄板を成形する負角成形型、特に入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合に関する。ここで、負角成形型とは上型の直線方向の下降軌跡より下型内に入り込んだ成形をいう。
【０００２】
【従来の技術】
金属製薄板のワークを上型の直線方向の下降軌跡より下型内に入り込んだ負角成形は、通常スライドカムを用いて行われている。
【０００３】
従来の金属製薄板のワークの入り込み成形は、下型上にワークを載置し、上型を垂直下方に下降させて下型の受動カムを上型の作動カムにて駆動し、ワークを横方向から加工し、加工が完了し上型が上昇すると、作動カムをスプリングにより後退させていた。
【０００４】
この場合、ワークの外方横方向から摺動してワークを成形する受動カムの成形部は、ワークの成形部形状と同一の一体形状に形成してあるが、ワークが載置される下型の成形部は、加工完了後ワークを下型から取り出さねばならないので、下型の入り込み部分を分割し後退させるか、あるいは入り込み部分の後部を削除しておきワークを前方へ移動させてワークの取り出しを可能としなければならない。入り込みの程度が僅かである場合はあまり問題にならないが、入り込み程度が大きい場合やワークが細長い枠状の断面が溝状で、たとえば、自動車の金属製薄板のフロントピラーアウターのような部品では、そのワークの溝幅が狭いため、入り込んだ下型の部分を分割したり削除したりすると、受動カムの成形部で形状がくっきり形成できないのみならず、下型の強度も不足し入り込み成形加工が不可能であった。
【０００５】
また、製品に捩れや歪が生じ、製品を修正する必要が生じる場合もあるが、サイドパネル、フェンダー、ルーフ、ボンネット、トランクリッド、ドアパネルやフロントピラーアウターのような自動車の外板部分を構成する部品では三次元の曲面・曲線を有し、製品の修正は実際上不可能に近い。自動車の金属製薄板組立の場合、製品に捩れや歪が生じていると、他の部品と結合させにくく、高品質の自動車用金属製薄板構造の提供ができなくなり、金属製薄板成形品の所定の製品精度を維持することができなかった。
【０００６】
上記の問題を解決するため、上型の下降直線運動を回転運動に変換して回転カムを回動させ、上型の直線方向の下降軌跡より下型内に入り込んだ成形部分を成形させ、成形後、成形したワークが下型より取り出せる状態まで回転カムを回動後退させるべく、次の構成が提案された。
【０００７】
すなわち、図９〜図１４に示すように、金属製薄板のワークＷを支持部１０１に載置する下型１０２と、前記下型１０２に対し直線方向に下降してワークＷに衝合してワークＷを成形する上型１０３とで構成し、外周面に開口し、軸方向に刻設した溝１０４を有し、溝１０４の支持部１０１寄りの縁部に上型１０３の軌跡より入り込んだ入り込み成形部１０５を形成し、下型１０２に回動自在に設けた回転カム１０６と、入り込み成形部１０７を有し、前記回転カム１０６に対向させて上型１０３に摺動自在に設けたスライドカム１０８と、成形後、ワークＷを下型１０２から取り出せる状態まで回転カム１０６を回動後退させる、下型１０２に設けたエアシリンダ１０９とよりなり、下型１０２の支持部１０１に載置されたワークＷを、回転カム１０６の入り込み成形部１０５とスライドカム１０８の入り込み成形部１０７で、スライドカム１０８は摺動してワークＷを成形し、成形後、エアシリンダ１０９により回転カム１０６を回動後退させ、成形したワークＷを下型１０２より取り出せるようにした負角成形型とした。
【０００８】
この負角成形型の作動について述べる。
【０００９】
まず、図９に示すように、上型１０３は上死点に位置させてあり、その時下型１０２の支持部１０１にワークＷを載置する。この時は、回転カム１０６はエアシリンダ１０９により回動後退している。
【００１０】
次に、図１０に示すように、回転カム１０６はエアシリンダ１０９により成形姿勢になっている。上型１０３が下降し始め、下型１０２の支持部１０１に載置したワークＷをパッド１１０が押圧する。
【００１１】
続いて、上型１０３が下降し、図１１に示すように、スライドカム１０８が回転カム１０６の入り込み成形部１０５に干渉することなく、スライドカム１０８の下面が回動プレート１１１に当接する。
【００１２】
上型１０３がなお下降し続けると、型の外側方向に付勢されているスライドカム１０８は、コイルスプリング１１２の付勢力に抗して、カムの作用によって横方向で左方へ移動し、図１２に示す状態となり、回転カム１０６の入り込み成形部１０５とスライドカム１０８の入り込み成形部１０７とでワークＷの入り込み成形を行う。
【００１３】
入り込み成形後は、図１３に示すように、上型１０３が上昇し始める。
【００１４】
スライドカム１０８はコイルスプリング１１２により型の外方向に付勢されており、図１３において右方に移動し入り込み成形されたワークＷと干渉することなく上昇する。
【００１５】
一方、スライドカム１０８が上昇し、回転カム１０６はエアシリンダ１０９により図１４において右方へ回動させ、入り込み成形したワークＷの下型１０２よりの取り出しの際、ワークＷが回転カム１０６の入り込み成形部１０５と干渉することなく取り出せる。
【００１６】
エアシリンダは、上述のように、入り込み成形後、成形されたワークを下型から取り出すのに回転カムを回動復帰させるため、必要なものである。
【００１７】
ワークＷの入り込み成形部が、図１５に示すコ字状溝１２１であると、入り込み成形後、回動後退する回転カム１０６とワークＷのコ字状溝１２１と干渉する。
【００１８】
従来は、上記の干渉を避けるため、コ字状溝１２１を下辺を斜辺１２２に形成していた。
【００１９】
【発明が解決しようとする課題】
入り込み加工において、コ字状溝のような入り込み成形部が回転カムと干渉するようなワーク形状であっても、プレス型を増加させず入り込み加工ができる負角成形型が求められている。
【００２０】
【課題を解決するための手段】
そこで、本発明は、上記の事情に鑑み、入り込み加工において干渉するようなワーク形状であっても、プレス型を増加させず入り込み加工ができるようにすべく、金属製薄板のワークを支持部に載置する下型と、前記下型に対し直線方向に下降してワークに衝合してワークを成形する上型とで構成し、支持部寄りの縁部に上型の軌跡より入り込んだ入り込み溝を形成し、下型に回動自在に設けた回転カムと、入り込み成形部を有し、前記回転カムに対向させて摺動自在に設けたスライドカムと、成形後、ワークを下型から取り出せる状態まで回転カムを回動後退させる、下型に設けた自動復帰具とよりなり、下型の支持部に載置されたワークを回転カムの入り込み溝とスライドカムの入り込み成形部で、スライドカムは摺動してワークを成形し、成形後、自動復帰具により回転カムを回動後退させ、成形したワークを下型より取り出せるようにした負角成形型において、入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合、入り込み溝部の回転カムの一部を分割したスライダーを、スライドカムの摺動方向と直交する方向に移動自在に設け、スライドカムのドライブプレートをスライダーの底面に当接させて入り込み溝を形成した後にスライドカムの入り込み成形部を進入させて入り込み加工をさせるようにした負角成形型とした。
【００２１】
また、本発明は、金属製薄板のワークを支持部に載置する下型と、前記下型に対し直線方向に下降してワークに衝合してワークを成形する上型とで構成し、支持部寄りの縁部に上型の軌跡より入り込んだ入り込み溝を形成し、下型に回動自在に設けた回転カムと、入り込み成形部を有し、前記回転カムに対向させて摺動自在に設けたスライドカムと、成形後、ワークを下型から取り出せる状態まで回転カムを回動後退させる、下型に設けた自動復帰具とよりなり、下型の支持部に載置されたワークを回転カムの入り込み溝とスライドカムの入り込み成形部で、スライドカムは摺動してワークを成形し、成形後、自動復帰具により回転カムを回動後退させ、成形したワークを下型より取り出せるようにした負角成形型において、入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合、入り込み溝部の回転カムの一部を分割したスライダーを、スライドカムの摺動方向と直交する方向に移動自在に設け、スライドカムのドライブプレートをスライダーの底面に当接させて入り込み溝を形成した後に、スライドカムの入り込み成形部を進入させて入り込み加工を行い、スライダーを弾性体で復帰させるようにした負角成形型であるので、スライドカムの入り込み成形部を進入させて入り込み加工を行い、スライダーを弾性体で復帰させるようにした。
【００２２】
本発明は、具体的には、弾性体がコイルスプリングである。
【００２３】
本発明は、具体的には、弾性体がガススプリングである。
【００２４】
本発明は、回転カムの変形を防止するため、弾性体の端面を回転カムに当接しないようにした。
【００２５】
さらに、本発明は、スライダーが上下動するものばかりでなく、回動させて入り込み溝を形成した後に、スライドカムの入り込み成形部を進入させて入り込み加工できるように、金属製薄板のワークを支持部に載置する下型と、前記下型に対し直線方向に下降してワークに衝合してワークを形成する上型とで構成し、支持部寄りの縁部に上型の軌跡より入り込んだ入り込み溝を形成し、下型に回動自在に設けた回転カムと、入り込み成形部を有し、前記回転カムに対向させて摺動自在に設けたスライドカムと、成形後、ワークを下型から取り出せる状態まで回転カムを回動後退させる、下型に設けた自動復帰具とよりなり、下型の支持部に載置されたワークを回転カムの入り込み溝とスライドカムの入り込み成形部で、スライドカムは摺動してワークを成形し、成形後、自動復帰具により回転カムを回動後退させ、成形したワークを下型より取り出せるようにした負角成形型において、入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合、入り込み溝部の回転カムの部分を分割した回転体を回転軸のまわりに揺動自在に設け、スライドカムの作動片を前記回転体に当接させて入り込み溝を形成した後にスライドカムの入り込み成形部を進入させて入り込み加工をさせるようにした負角成形型とした。
【００２６】
【発明の実施の態様】
本発明を、添付する図１〜図５に示す一実施例に基づいて以下詳細に説明する。
【００２７】
図１は、本発明の負角成形型の全体の概要を示す縦断面図である。
【００２８】
本発明の負角成形型は下型１と上型２とよりなる。
【００２９】
上型１は、下型本体３上にボルト４によりカムベース５を固着し、ボルト６により回転カム７の支持台８を固着し、ワークキャップ９はキー１０で位置決めしてボルト１１にて固着する。
【００３０】
さらに、カムベース５上にはスライドカム１２が摺動自在に設けられ、図示してないが、スプリングにより復帰できるように構成されている。成形ブロック１３がボルト１４により固着され、成形ブロック１３の前方上方には入り込み成形部材１５が固着され、成形ブロック１３の前方下方のウェアプレート１６は回転カム７上のウェアプレート１７に当接させ、成形ブロック１３の前方中間部には後述のスライダー１８を駆動するドライブプレート１９が固着されている。
【００３１】
回転カム７は中心回転カム７_１と周回転カム７_２、７_３よりなり、これ等は図示しないがボルト等で一体化している。
【００３２】
上型２は、上型本体２０にボルト２１により前記スライドカム１２に当接する作動カム２２を固着している。上型本体２０には、ワークＷを入り込み加工前に押圧するパッド２３がコイルスプリング２４で付勢されて吊りボルト２５により吊り下げられている。
【００３３】
図２には、本負角成形で加工するワークを示す。本ワークは自動車の金属製薄板のリヤーフェンダーであって、実線が前工程の形状で、二点鎖線で示すのは入り込み成形加工後の状態である。
【００３４】
図３、図４および図５はスライダー１８関係の詳細図である。
【００３５】
スライダー１８は、図４に示すように、縮設したコイルスプリング２６により下方に付勢され、その下面は支持片２７に当接してオープン状態である。符号２８は案内板である。
【００３６】
スライダー１８が周回転カム７_３との間に正確なコ字状溝２９を形成させるために、図３に示す起立させたガイドピン３０により固着したブッシュ３１と嵌合させる。ガイドピン３０は２本設けた方が正確になる。
【００３７】
図５に示すように、ドライブプレート１９は成形ブロック１３の前方中央に固着されている。このドライブプレート１９に対向するスライダー１８下面に受動プレート３２が固着されドライブプレート１９と当接させてある。ドライブプレート１９にも斜面３３が形成してあって、受動プレート３２にも斜面３４が形成してある。
【００３８】
成形ブロック１３が進入してきてドライブプレート１９がスライダー１８の受動プレート３２に当接すると、スライダー１８はガイドピン３０により案内され正確なコ字状溝２９を形成し、その入り込み成形部材１５の先端入り込み成形部３５が入り込み加工を行う。正確なコ字状溝２９が形成されているので、ワークＷにも正確なコ字状溝が加工できる。
【００３９】
入り込み加工後、上型２が上昇すると、スライドカム１２が後退する。スライドカム１２が後退すると、スライダー１８はコイルスプリング２６により下方に付勢されているので、スライダー１８は下方に移動してワークＷより遠ざかり、回転カム７が回動復帰しても、回転カム７がワークＷに干渉するようなことはない。
【００４０】
スライダー１８が下方に移動するのにコイルスプリング２６を用いたが、本発明は、コイルスプリングに限定されず他の付勢体であってもよい。付勢体として、図６に示すようなガススプリング４１を用いることができる。ガススプリング４１は若干右下がり状に配置し、その先端のロッド４２を周回転カム７_３に当接させ、ガススプリング４１の基端はスライダー１８に螺着した設置用プラグ４３に当接させる。設置用プラグ４３には取付け取外しを容易にするために六角穴４４が凹設してある。
【００４１】
ガススプリング４１のシリンダー４５は、使用用途に応じた高圧ガス、例えば１５０ｋｇｆ／ｃｍ^２の高圧が収容されていて、シリンダー４５から突出したロッド４２が伸縮しても、ロッド伸縮工程の全長にわたりほぼ一定の出力、例えば１５０ｋｇｆ／ｃｍ^２が得られる。これは２個のタンクがシリンダー４５内に内蔵されているが、ロッド４２が収縮し、一方のタンクに圧力がかかると一方のタンクから高圧ガスが流出し、他方のタンクに流入させて、ロッドの全工程にわたり、ほぼ一定の出力（圧縮されると若干出力が大きくなる場合がある）が得られる。このように、ガススプリング４１は、コイルスプリングと異なり、作動し始めから高出力が全工程にわたり得られ、スライダー１８を確実に復帰させることができる。
【００４２】
次に、付勢体を直接周回転カム７_３に作動させないようにして周回転カム７_３の変形を防止しようとするものであって、その一例を図７に示す。
【００４３】
図７のスライダー１８には、支持穴４６を凹設し、そこに頭部付き支持ボルト４７を挿入してスライダー１８を貫通させて中心回転カム７_１に螺着して、支持ボルト４７の頭部４８と支持穴４６の穴底との間にコイルスプリング４９を縮設する。コイルスプリング４９の付勢力が周回転カム７_３に伝達させて周回転カム７_３を変形させるようなことはない。
【００４４】
本発明では、スライダーの移動方向はスライドカムの摺動方向と直交する方向に移動自在に設けたとしてあるが、完全に直交する方向だけでなく、若干変更させたものでも本発明に当然含まれる。
【００４５】
本発明は、上述のようにスライダーが上下動するものばかりでなく、回動させて入り込み溝を形成した後に、スライドカムの入り込み成形部を進入させて入り込み加工をさせることができる。その例を図８に示す。
【００４６】
図８に示すようにして、入り込み溝部の回転カムの部分を分割して回動体５１を構成し、回動体５１は図示の場合は二部材よりなり、図示しないがボルト等で一体化し、中心回転カム７_１にボルト５２により固着したブラケット５３に架設した回転軸５４のまわりに揺動自在に設ける。
【００４７】
回動体５１の下方のスライドカム１２側に突起５７を突出させ、回動体５１の回転軸５４の下方で図において、回動体５１を右方向に回転させるよう弾性体５６（図示ではコイルスプリングを示す）を縮設する。
【００４８】
一方、スライドカム１２の成形ブロック１３には前記突起５７に対向する位置に作動片５５を突設する。
【００４９】
スライドカム１２の作動片５５が突起５７に衝合して回動体５１を回動させて入り込み溝を形成した後にスライドカム１２の入り込み成形部３５を進入するように設定しておき、入り込み加工を行う。入り込み加工後スライドカム１２が後退すると、回動体５１は弾性体５１の付勢力により回動（図示で右方向）し、回転カム７とワークＷと干渉するようなことはない。
【００５０】
【発明の効果】
本発明は、上述のように、金属製薄板のワークを支持部に載置する下型と、前記下型に対し直線方向に下降してワークに衝合してワークを成形する上型とで構成し、支持部寄りの縁部に上型の軌跡より入り込んだ入り込み溝を形成し、下型に回動自在に設けた回転カムと、入り込み成形部を有し、前記回転カムに対向させて摺動自在に設けたスライドカムと、成形後、ワークを下型から取り出せる状態まで回転カムを回動後退させる、下型に設けた自動復帰具とよりなり、下型の支持部に載置されたワークを回転カムの入り込み溝とスライドカムの入り込み成形部で、スライドカムは摺動してワークを成形し、成形後、自動復帰具により回転カムを回動後退させ、成形したワークを下型より取り出せるようにした負角成形型において、入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合、入り込み溝部の回転カムの一部を分割したスライダーを、スライドカムの摺動方向と直交する方向に移動自在に設け、スライドカムのドライブプレートをスライダーの底面に当接させて入り込み溝を形成した後にスライドカムの入り込み成形部を進入させて入り込み加工をさせるようにした負角成形型であるので、入り込み加工において、コ字状溝のような入り込み成形部が回転カムと干渉するようなワーク形状であっても、プレス型を増加させず入り込み加工ができる負角成形型の提供ができる。
【００５１】
また、本発明は、金属製薄板のワークを支持部に載置する下型と、前記下型に対し直線方向に下降してワークに衝合してワークを成形する上型とで構成し、支持部寄りの縁部に上型の軌跡より入り込んだ入り込み溝を形成し、下型に回動自在に設けた回転カムと、入り込み成形部を有し、前記回転カムに対向させて摺動自在に設けたスライドカムと、成形後、ワークを下型から取り出せる状態まで回転カムを回動後退させる、下型に設けた自動復帰具とよりなり、下型の支持部に載置されたワークを回転カムの入り込み溝とスライドカムの入り込み成形部で、スライドカムは摺動してワークを成形し、成形後、自動復帰具により回転カムを回動後退させ、成形したワークを下型より取り出せるようにした負角成形型において、入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合、入り込み溝部の回転カムの一部を分割したスライダーを、スライドカムの摺動方向と直交する方向に移動自在に設け、スライドカムのドライブプレートをスライダーの底面に当接させて入り込み溝を形成した後に、スライドカムの入り込み成形部を進入させて入り込み加工を行い、スライダーを弾性体で復帰させるようにした負角成形型であるので、スライドカムの入り込み成形部を進入させて入り込み加工を行い、スライダーを弾性体で復帰させるようにした。
【００５２】
本発明は、具体的には、弾性体がコイルスプリングである。
【００５３】
本発明は、具体的には、弾性体がガススプリングである。
【００５４】
本発明は、回転カムの変形を防止するため、弾性体の端面を回転カムに当接しないようにした。
【００５５】
さらに、本発明は、金属製薄板のワークを支持部に載置する下型と、前記下型に対し直線方向に下降してワークに衝合してワークを形成する上型とで構成し、支持部寄りの縁部に上型の軌跡より入り込んだ入り込み溝を形成し、下型に回動自在に設けた回転カムと、入り込み成形部を有し、前記回転カムに対向させて摺動自在に設けたスライドカムと、成形後、ワークを下型から取り出せる状態まで回転カムを回動後退させる、下型に設けた自動復帰具とよりなり、下型の支持部に載置されたワークを回転カムの入り込み溝とスライドカムの入り込み成形部で、スライドカムは摺動してワークを成形し、成形後、自動復帰具により回転カムを回動後退させ、成形したワークを下型より取り出せるようにした負角成形型において、入り込み成形後、回動後退する回転カムとワークの入り込み成形部とが干渉する場合、入り込み溝部の回転カムの部分を分割した回転体を回転軸のまわりに揺動自在に設け、スライドカムの作動片を前記回転体に当接させて入り込み溝を形成した後にスライドカムの入り込み成形部を進入させて入り込み加工をさせるようにした負角成形型としたので、スライダーが上下動するものばかりでなく、回動させて入り込み溝を形成した後に、スライドカムの入り込み成形部を進入させて入り込み加工できる。
【図面の簡単な説明】
【図１】本発明の具体的一実施例の全体の概要を示す縦断面図である。
【図２】本発明の加工するワークを説明する要部の縦断面図である。
【図３】本発明のスライダーの案内機構を説明する要部の縦断面図である。
【図４】本発明のスライダーの復帰機構を説明する要部の縦断面図である。
【図５】本発明の入り込み成形部材で入り込み加工を説明する要部の縦断面図である。
【図６】本発明のスライダーを復帰させる弾性体としてガススプリングを用いた例を示す要部の縦断面図である。
【図７】本発明のスライダーを復帰させる弾性体が回転カムを変形させないようにした要部の縦断面図である。
【図８】本発明のスライダーが上下動するものばかりでなく、回動させて入り込み溝を形成した後にスライドカムの入り込み成形部を進入させて入り込み加工できるようにした負角成形型の要部の断面図である。
【図９】入り込み成形する従来の負角成形型の上型が上死点の状態の縦断面図である。
【図１０】従来の負角成形型で、エアシリンダにより回転カムが成形姿勢になり、上型が下降し、ワークをパッドで押圧した状態の縦断面図である。
【図１１】従来の負角成形型の上型が下降して下型に当接してワークに接触し始めた状態の縦断面図である。
【図１２】従来の負角成形型の上型が下死点の状態の縦断面図である。
【図１３】従来の負角成形型で、入り込み成形加工が完了し、上型が上昇し始めた状態の縦断面図である。
【図１４】従来の負角成形型が入り込み成形して上型がさらに上昇し、上死点の状態にある縦断面図である。
【図１５】従来のワークのコ字状溝では、回転カムが復帰回動すると、回転カムがワークと干渉し、下辺を斜辺に変更すると回転カムが復帰回動の際、回転カムがワークと干渉しないことを説明する図である。
【符号の説明】
Ｗ…ワーク
９…ワークキャップ（支持部の例）
１…下型
２…上型
２９…入り込み溝
７…回転カム
３５…入り込み成形部
１２…スライドカム
１０９…シリンダ（自動復帰具の例）
１９…ドライブプレート
１８…スライダー
２６…コイルスプリング
４１…ガススプリング
５１…回転体
５４…回転軸
５５…作動片[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a negative angle forming die for forming a metal thin plate, and more particularly, to a case where a rotary cam that rotates and retracts after entering forming interferes with an entering forming portion of a workpiece. Here, the negative angle mold means a mold that enters the lower mold from the downward trajectory of the upper mold in the linear direction.
[0002]
[Prior art]
Negative angle forming, in which a metal thin plate workpiece is inserted into the lower die from the downward trajectory in the linear direction of the upper die, is usually performed using a slide cam.
[0003]
In conventional intrusion molding of metal thin plate workpieces, the workpiece is placed on the lower die, the upper die is lowered vertically and the lower die passive cam is driven by the upper die actuating cam to move the workpiece horizontally. When machining was done from the direction, and the machining was completed and the upper mold was raised, the operating cam was retracted by the spring.
[0004]
In this case, the forming part of the passive cam for forming the work by sliding from the lateral direction of the work is formed in the same integrated shape as the forming part shape of the work, but the lower mold on which the work is placed Since the work part of the mold must be taken out of the lower mold after machining, the lower mold entry part is divided and retracted, or the rear part of the entry part is deleted and the work is moved forward to take out the work part. Must be possible. If the degree of penetration is slight, it does not matter much, but if the degree of penetration is large or the work has a long and narrow frame-shaped cross section, for example, in parts such as the front pillar outer of a metal thin plate of an automobile, Since the groove width of the workpiece is narrow, if the part of the lower mold that has entered is divided or deleted, the shape of the passive cam molding part cannot be clearly formed, and the strength of the lower mold is also insufficient, so that the intrusion molding process is not possible. It was impossible.
[0005]
Also, the product may be twisted or distorted, and it may be necessary to correct the product, but it constitutes the outer panel part of the automobile such as side panel, fender, roof, bonnet, trunk lid, door panel and front pillar outer Parts have three-dimensional curved surfaces and curves, and it is practically impossible to modify products. In the case of automobile metal sheet assembly, if the product is twisted or distorted, it is difficult to connect with other parts, and it becomes impossible to provide a high-quality metal sheet structure for automobiles. The product accuracy could not be maintained.
[0006]
In order to solve the above problems, the lower die linear motion is converted into rotational motion and the rotating cam is rotated to form the molding part that has entered the lower die from the lower die linear trajectory. Later, the following configuration was proposed to rotate and retract the rotating cam until the molded workpiece could be taken out from the lower mold.
[0007]
That is, as shown in FIGS. 9 to 14, the lower mold 102 for placing the metal thin plate workpiece W on the support portion 101 and the lower mold 102 is lowered in a linear direction and collides with the workpiece W. The upper die 103 for forming the workpiece W is formed, has an opening on the outer peripheral surface, has a groove 104 engraved in the axial direction, and enters the edge of the groove 104 near the support portion 101 from the locus of the upper die 103. A slide cam 106 which is formed with an intrusion forming portion 105 and which is rotatably provided on the lower mold 102, and an intrusion forming portion 107 which is slidably provided on the upper die 103 so as to face the rotation cam 106. Composed of a cam 108 and an air cylinder 109 provided on the lower mold 102 for rotating and retreating the rotary cam 106 until the workpiece W can be taken out from the lower mold 102 after molding, and is placed on the support portion 101 of the lower mold 102. Work W The slide cam 108 slides to form the workpiece W by the intrusion forming portion 105 of the cam 106 and the intrusion forming portion 107 of the slide cam 108. After forming, the rotary cam 106 is rotated and retracted by the air cylinder 109 to form. A negative angle forming die was formed so that the workpiece W could be taken out from the lower die 102.
[0008]
The operation of this negative angle mold will be described.
[0009]
First, as shown in FIG. 9, the upper mold 103 is positioned at the top dead center, and the workpiece W is placed on the support portion 101 of the lower mold 102 at that time. At this time, the rotating cam 106 is rotated and retracted by the air cylinder 109.
[0010]
Next, as shown in FIG. 10, the rotary cam 106 is in a molding posture by the air cylinder 109. The upper mold 103 starts to descend, and the pad 110 presses the work W placed on the support portion 101 of the lower mold 102.
[0011]
Subsequently, the upper mold 103 is lowered, and the lower surface of the slide cam 108 comes into contact with the rotating plate 111 without the slide cam 108 interfering with the entering molding portion 105 of the rotary cam 106 as shown in FIG.
[0012]
When the upper mold 103 continues to descend, the slide cam 108 urged in the outer direction of the mold moves to the left in the lateral direction by the action of the cam against the urging force of the coil spring 112. 12, the workpiece W is intruded by the intrusion forming portion 105 of the rotary cam 106 and the intrusion forming portion 107 of the slide cam 108.
[0013]
After the intrusion molding, the upper mold 103 starts to rise as shown in FIG.
[0014]
The slide cam 108 is urged to the outside of the mold by the coil spring 112 and moves to the right in FIG. 13 and moves up without interfering with the workpiece W formed by entering.
[0015]
On the other hand, the slide cam 108 is raised, and the rotating cam 106 is rotated rightward in FIG. 14 by the air cylinder 109. When the workpiece W is taken out from the lower mold 102, the workpiece W enters the rotating cam 106. It can be taken out without interfering with the molding part 105.
[0016]
As described above, the air cylinder is necessary in order to return the rotating cam to take out the molded workpiece from the lower mold after the intrusion molding.
[0017]
If the intrusion forming part of the workpiece W is the U-shaped groove 121 shown in FIG. 15, it interferes with the rotating cam 106 that rotates and retracts after the intrusion forming and the U-shaped groove 121 of the workpiece W.
[0018]
Conventionally, in order to avoid the above-described interference, the U-shaped groove 121 is formed with a hypotenuse 122 on the lower side.
[0019]
[Problems to be solved by the invention]
There is a need for a negative angle forming die capable of performing intrusion processing without increasing the press die even if the intrusion forming portion such as the U-shaped groove interferes with the rotary cam in the intrusion processing.
[0020]
[Means for Solving the Problems]
Accordingly, in view of the above circumstances, the present invention provides a metal thin plate workpiece as a support portion so that the workpiece can be inserted without increasing the press die even when the workpiece shape interferes with the penetration. It consists of a lower die to be placed and an upper die that descends in a linear direction with respect to the lower die and collides with the workpiece to form the workpiece, and enters the edge closer to the support portion from the locus of the upper die. A rotary cam having a groove and rotatably provided in the lower mold, a slide cam having an intrusion forming portion and slidably provided facing the rotary cam, and after forming, the workpiece is removed from the lower mold. It consists of an automatic return tool provided on the lower mold that rotates and retracts the rotating cam until it can be taken out, and slides the workpiece placed on the lower mold support section with the groove of the rotating cam and the molding section of the slide cam. Cam slides to form workpiece After the molding, in the negative angle molding die in which the rotary cam is rotated and retracted by an automatic return tool so that the molded workpiece can be taken out from the lower mold, If there is interference, a slider that divides a part of the rotary cam of the entrance groove is provided so as to be movable in the direction perpendicular to the sliding direction of the slide cam, and the slide cam drive plate is brought into contact with the bottom surface of the slider to enter. After forming the groove, a negative angle forming die was formed in which the intrusion forming portion of the slide cam was entered to perform intrusion processing.
[0021]
In addition, the present invention comprises a lower mold for placing a metal thin plate workpiece on a support portion, and an upper mold for lowering the lower mold in a linear direction and colliding with the workpiece to form the workpiece, An entrance groove is formed in the edge near the support part from the locus of the upper mold, and the rotary mold is provided rotatably on the lower mold and the entrance molding part, and is slidable facing the rotation cam. A slide cam provided on the lower mold and an automatic return tool provided on the lower mold for rotating and retracting the rotary cam until the workpiece can be removed from the lower mold after molding. The slide cam slides to form the workpiece at the rotary cam entry groove and slide cam entry molding part. After molding, the rotary cam is rotated and retracted by the automatic return tool so that the molded workpiece can be taken out from the lower mold. In the negative angle mold, When the rotating cam that rotates and interferes with the workpiece forming part of the workpiece, a slider that divides a part of the rotating cam of the entering groove is provided so as to be movable in the direction perpendicular to the sliding direction of the slide cam. This is a negative angle mold in which the drive plate is brought into contact with the bottom surface of the slider to form an intrusion groove, and then the intrusion forming portion of the slide cam is introduced to perform intrusion processing so that the slider is returned by an elastic body. Therefore, the intrusion forming portion of the slide cam is entered to perform intrusion processing, and the slider is returned with an elastic body.
[0022]
In the present invention, specifically, the elastic body is a coil spring.
[0023]
In the present invention, specifically, the elastic body is a gas spring.
[0024]
In the present invention, in order to prevent deformation of the rotating cam, the end face of the elastic body is not brought into contact with the rotating cam.
[0025]
Furthermore, the present invention supports not only the slider that moves up and down, but also supports the work of a thin metal plate so that the slide cam can be inserted into the slide forming portion after the slide groove has been formed. The lower die placed on the part and the upper die that descends in a linear direction relative to the lower die and collides with the workpiece to form the workpiece, and enters the edge near the support portion from the locus of the upper die. A rotary cam formed with a slot into the lower mold and rotatably provided in the lower mold, a slide cam having an intrusion forming portion and slidably provided facing the rotary cam, and the workpiece after lowering It consists of an automatic return tool provided on the lower mold that rotates and retracts the rotary cam until it can be removed from the mold, and the workpiece placed on the lower mold support part is inserted into the groove of the rotary cam and the slide cam insertion molding part. The slide cam slides After forming the workpiece, the rotating cam is rotated and retracted by the automatic return tool after the forming, and in the negative angle forming die that allows the molded workpiece to be taken out from the lower mold, When the interference molding part interferes, a rotary body obtained by dividing the rotary cam portion of the entrance groove part is provided so as to be swingable around the rotary shaft, and the slide cam operating piece is brought into contact with the rotary body to form the entrance groove. After forming, a negative angle forming die in which the intrusion forming portion of the slide cam was introduced to perform intrusion processing was obtained.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described in detail below based on an embodiment shown in FIGS.
[0027]
FIG. 1 is a longitudinal sectional view showing an outline of the entire negative angle mold of the present invention.
[0028]
The negative angle mold according to the present invention includes a lower mold 1 and an upper mold 2.
[0029]
The upper die 1 has a cam base 5 fixed on the lower die main body 3 by bolts 4, a support base 8 of the rotating cam 7 is fixed by bolts 6, and a work cap 9 is positioned by a key 10 and fixed by bolts 11. .
[0030]
Further, a slide cam 12 is slidably provided on the cam base 5 and is configured to be returned by a spring (not shown). The forming block 13 is fixed by bolts 14, and the intrusion forming member 15 is fixed to the upper front of the forming block 13. The wear plate 16 at the lower front of the forming block 13 is brought into contact with the wear plate 17 on the rotating cam 7, A drive plate 19 for driving a slider 18 (described later) is fixed to the front intermediate portion of the molding block 13.
[0031]
Rotary cam 7 is made of the center rotating cam ₇₁ and the circumferential rotary cam 7 _2, 7 _3, which like not shown are integrated by a bolt or the like.
[0032]
The upper die 2 is fixed to the upper die main body 20 with a working cam 22 that abuts against the slide cam 12 with a bolt 21. A pad 23 that enters the workpiece W and presses the workpiece W before being processed is urged by a coil spring 24 and is suspended by a suspension bolt 25 on the upper mold body 20.
[0033]
FIG. 2 shows a workpiece to be processed by this negative angle forming. This work is a rear fender of a metal thin plate of an automobile. The solid line is the shape of the previous process, and the two-dot chain line shows the state after the intrusion forming process.
[0034]
3, 4, and 5 are detailed views of the slider 18.
[0035]
As shown in FIG. 4, the slider 18 is urged downward by a contracted coil spring 26, and its lower surface is in contact with the support piece 27 and is in an open state. Reference numeral 28 denotes a guide plate.
[0036]
To form a correct U-shaped groove 29 between the slider 18 and the peripheral rotary cam 7 _3, fitted with bushing 31 which is fixed by the guide pin 30 is raised shown in FIG. It is more accurate to provide two guide pins 30.
[0037]
As shown in FIG. 5, the drive plate 19 is fixed to the front center of the molding block 13. A passive plate 32 is fixed to the lower surface of the slider 18 facing the drive plate 19 and is in contact with the drive plate 19. A slope 33 is formed on the drive plate 19, and a slope 34 is also formed on the passive plate 32.
[0038]
When the molding block 13 enters and the drive plate 19 contacts the passive plate 32 of the slider 18, the slider 18 is guided by the guide pin 30 to form an accurate U-shaped groove 29, and the leading end of the entering molding member 15 enters. The forming part 35 performs intrusion processing. Since the accurate U-shaped groove 29 is formed, an accurate U-shaped groove can also be processed in the workpiece W.
[0039]
If the upper mold | type 2 raises after an intrusion process, the slide cam 12 will reverse | retreat. When the slide cam 12 moves backward, the slider 18 is urged downward by the coil spring 26. Therefore, even if the slider 18 moves downward and moves away from the workpiece W, and the rotary cam 7 returns, the rotary cam 7 Does not interfere with the workpiece W.
[0040]
Although the coil spring 26 is used to move the slider 18 downward, the present invention is not limited to the coil spring but may be another urging body. A gas spring 41 as shown in FIG. 6 can be used as the urging member. Gas spring 41 is arranged slightly downward-sloping shape, is brought into contact with the rod 42 of the tip to the circumferential rotary cam 7 _3, the proximal end of the gas spring 41 is brought into contact with the installation plug 43 which is screwed to the slider 18. The installation plug 43 is recessed with a hexagonal hole 44 for easy attachment / removal.
[0041]
The cylinder 45 of the gas spring 41 contains a high-pressure gas according to the intended use, for example, a high pressure of 150 kgf / cm ^{2. Even if} the rod 42 protruding from the cylinder 45 expands and contracts, it is almost constant over the entire length of the rod expansion / contraction process. For example, 150 kgf / cm ² is obtained. This is because two tanks are built in the cylinder 45, but when the rod 42 contracts and pressure is applied to one tank, the high pressure gas flows out from one tank and flows into the other tank. An almost constant output (the output may become slightly larger when compressed) is obtained throughout the entire process. Thus, unlike the coil spring, the gas spring 41 can obtain a high output from the start of operation throughout the entire process, and can reliably return the slider 18.
[0042]
Then, any intended to prevent direct peripheral rotary cam 7 ₃ the deformation of the circumferential rotary cam 7 ₃ so as not to operate the urging body, an example of which is shown in FIG.
[0043]
The slider 18 of FIG. 7, the support hole 46 recessed, there is inserted a headed support bolts 47 screwed in the center rotating cam ₇₁ by penetrating the slider 18, the head of the support bolt 47 A coil spring 49 is contracted between the portion 48 and the bottom of the support hole 46. The urging force of the coil spring 49 will not such as to deform the circumferential rotary cam 7 ₃ by transmitting to the peripheral rotary cam 7 _3.
[0044]
In the present invention, the moving direction of the slider is provided so as to be movable in a direction perpendicular to the sliding direction of the slide cam. However, the present invention naturally includes not only a completely perpendicular direction but also a slight change. .
[0045]
In the present invention, not only the slider moves up and down as described above, but also, after forming the entering groove by turning, the entering forming portion of the slide cam can be entered to perform the entering process. An example is shown in FIG.
[0046]
As shown in FIG. 8, the rotating cam 51 is divided by dividing the rotary cam portion of the entrance groove, and the rotating body 51 is composed of two members in the case of illustration and is integrated with a bolt or the like, although not shown, for central rotation. oscillating about an axis of rotation 54 bridged bracket 53 which is fixed by bolts 52 to the cam ₇₁ freely provided.
[0047]
A protrusion 57 protrudes toward the slide cam 12 below the rotating body 51, and an elastic body 56 (in the drawing, a coil spring is shown) to rotate the rotating body 51 in the right direction below the rotating shaft 54 of the rotating body 51. ).
[0048]
On the other hand, an operating piece 55 projects from the molding block 13 of the slide cam 12 at a position facing the projection 57.
[0049]
The operation piece 55 of the slide cam 12 abuts on the projection 57 to rotate the rotating body 51 to form the entry groove, and then the entry portion 35 of the slide cam 12 is set to enter, and the entry process is performed. Do. When the slide cam 12 moves backward after the entry processing, the rotating body 51 is rotated (rightward in the drawing) by the urging force of the elastic body 51 and does not interfere with the rotating cam 7 and the workpiece W.
[0050]
【The invention's effect】
As described above, the present invention includes a lower mold that places a metal thin plate workpiece on a support portion, and an upper mold that lowers in a linear direction relative to the lower mold and abuts the workpiece to form the workpiece. And has a rotating cam provided in the lower mold so as to be rotatable, and an intrusion forming section formed at the edge near the support section from the locus of the upper mold, facing the rotating cam. It consists of a slide cam that is slidable, and an automatic return tool that is provided on the lower mold to rotate and retract the rotary cam until the workpiece can be removed from the lower mold after molding. The slide cam slides to form the workpiece at the insertion groove of the rotary cam and the slide cam insertion molding part. After the molding, the rotary cam is rotated and retracted by the automatic return tool, and the molded workpiece is moved to the lower mold. In a negative angle mold that can be removed more easily. After molding, when the rotating cam that rotates and retracts and the workpiece forming part of the workpiece interfere with each other, a slider that divides a part of the rotating cam of the entering groove is provided so as to be movable in the direction perpendicular to the sliding direction of the slide cam. Since the negative cam is designed so that the slide cam drive molding part is entered after the slide cam drive plate is brought into contact with the bottom surface of the slider to form the entrance groove, Even if the intrusion forming portion such as the U-shaped groove interferes with the rotating cam, a negative angle forming die that can be intruded without increasing the press die can be provided.
[0051]
In addition, the present invention comprises a lower mold for placing a metal thin plate workpiece on a support portion, and an upper mold for lowering the lower mold in a linear direction and colliding with the workpiece to form the workpiece, An entrance groove is formed in the edge near the support part from the locus of the upper mold, and the rotary mold is provided rotatably on the lower mold and the entrance molding part, and is slidable facing the rotation cam. A slide cam provided on the lower mold and an automatic return tool provided on the lower mold for rotating and retracting the rotary cam until the workpiece can be removed from the lower mold after molding. The slide cam slides to form the workpiece at the rotary cam entry groove and slide cam entry molding part. After molding, the rotary cam is rotated and retracted by the automatic return tool so that the molded workpiece can be taken out from the lower mold. In the negative angle mold, When the rotating cam that rotates and interferes with the workpiece forming part of the workpiece, a slider that divides a part of the rotating cam of the entering groove is provided so as to be movable in the direction perpendicular to the sliding direction of the slide cam. This is a negative angle mold in which the drive plate is brought into contact with the bottom surface of the slider to form an intrusion groove, and then the intrusion forming portion of the slide cam is introduced to perform intrusion processing so that the slider is returned by an elastic body. Therefore, the intrusion forming portion of the slide cam is entered to perform intrusion processing, and the slider is returned with an elastic body.
[0052]
In the present invention, specifically, the elastic body is a coil spring.
[0053]
In the present invention, specifically, the elastic body is a gas spring.
[0054]
In the present invention, in order to prevent deformation of the rotating cam, the end face of the elastic body is not brought into contact with the rotating cam.
[0055]
Furthermore, the present invention comprises a lower mold for placing a metal thin plate workpiece on a support portion, and an upper mold that descends in a linear direction relative to the lower mold and abuts against the workpiece to form the workpiece, An entrance groove is formed in the edge near the support part from the locus of the upper mold, and the rotary mold is provided rotatably on the lower mold and the entrance molding part, and is slidable facing the rotation cam. A slide cam provided on the lower mold and an automatic return tool provided on the lower mold for rotating and retracting the rotary cam until the workpiece can be removed from the lower mold after molding. The slide cam slides to form the workpiece at the rotary cam entry groove and slide cam entry molding part. After molding, the rotary cam is rotated and retracted by the automatic return tool so that the molded workpiece can be taken out from the lower mold. Intrusion molding in negative angle molds When the rotating cam that rotates and retreats and the workpiece forming portion of the workpiece interfere with each other, a rotating body that divides the rotating cam portion of the entering groove is provided so as to be swingable around the rotating shaft, and the operating piece of the slide cam is provided as described above. Since it is a negative angle forming die that is in contact with the rotating body to form an intrusion groove and then enters the intrusion forming part of the slide cam to enter, so that the slider can rotate as well as the one that moves up and down Then, after forming the entry groove, the entry molding portion of the slide cam can be entered to perform entry processing.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an outline of the whole of a specific embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a main part for explaining a workpiece to be machined according to the present invention.
FIG. 3 is a longitudinal sectional view of a main part for explaining the guide mechanism of the slider of the present invention.
FIG. 4 is a longitudinal sectional view of an essential part for explaining a slider return mechanism of the present invention.
FIG. 5 is a longitudinal sectional view of a main part for explaining the penetration processing with the penetration molding member of the present invention.
FIG. 6 is a longitudinal sectional view of a main part showing an example in which a gas spring is used as an elastic body for returning the slider of the present invention.
FIG. 7 is a longitudinal sectional view of a main part in which an elastic body for returning the slider of the present invention does not deform the rotary cam.
FIG. 8 shows the main part of the negative angle mold in which the slider according to the present invention is moved up and down, and is rotated to form the entering groove, and then the entering part of the slide cam is entered to allow the entering process. FIG.
FIG. 9 is a vertical cross-sectional view showing a state where the upper die of the conventional negative angle molding die for intrusion molding is at the top dead center.
FIG. 10 is a longitudinal cross-sectional view of a conventional negative angle forming die in a state in which a rotary cam is in a forming posture by an air cylinder, an upper die is lowered, and a work is pressed by a pad.
FIG. 11 is a longitudinal sectional view showing a state in which an upper die of a conventional negative angle forming die descends and comes into contact with a lower die and starts to contact a workpiece.
FIG. 12 is a longitudinal sectional view showing a state where the upper die of the conventional negative angle mold is at the bottom dead center.
FIG. 13 is a vertical cross-sectional view of a conventional negative angle mold in a state in which an intrusion molding process is completed and an upper mold starts to rise.
FIG. 14 is a longitudinal sectional view showing a state where a conventional negative angle mold is intruded and the upper mold is further raised and is in a top dead center state.
FIG. 15 illustrates a conventional U-shaped groove of a workpiece in which when the rotating cam returns and rotates, the rotating cam interferes with the workpiece, and when the lower side is changed to an oblique side, the rotating cam rotates and returns to the workpiece. It is a figure explaining not interfering.
[Explanation of symbols]
W ... Work 9 ... Work cap (example of support part)
DESCRIPTION OF SYMBOLS 1 ... Lower type | mold 2 ... Upper type | mold 29 ... Inclusion groove | channel 7 ... Rotating cam 35 ... Inclusion molding part 12 ... Slide cam 109 ... Cylinder (example of an automatic return tool)
19 ... Drive plate 18 ... Slider 26 ... Coil spring 41 ... Gas spring 51 ... Rotary body 54 ... Rotating shaft 55 ... Operating piece

Claims

It consists of a lower mold for placing a metal thin workpiece on the support part, and an upper mold that descends linearly with respect to the lower mold and abuts against the work to form the work, and the edge near the support part A rotating cam provided in the lower die so as to be rotatable, and a slide cam provided with a forming portion and slidably provided facing the rotating cam. After the molding, the rotary cam is rotated and retracted until the work can be taken out from the lower mold, and the automatic return tool provided on the lower mold is used, and the work placed on the lower mold support part is inserted into the groove of the rotary cam. Negative angle mold that allows the slide cam to slide and mold the workpiece, and after the molding, the rotating cam is rotated and retracted by the automatic return tool so that the molded workpiece can be removed from the lower mold. In turn, after turning When the cam and workpiece entry molding part interfere, a slider that divides a part of the rotation cam of the entry groove is provided so as to be movable in the direction perpendicular to the sliding direction of the slide cam, and the slide cam drive plate is the slider A negative angle forming die in which an intrusion forming portion of a slide cam is entered after the intrusion groove is formed by contacting the bottom surface of the slide cam.

It consists of a lower mold for placing a metal thin workpiece on the support part, and an upper mold that descends linearly with respect to the lower mold and abuts against the work to form the work, and the edge near the support part A rotating cam provided in the lower die so as to be rotatable, and a slide cam provided with a forming portion and slidably provided facing the rotating cam. After the molding, the rotary cam is rotated and retracted until the work can be taken out from the lower mold, and the automatic return tool provided on the lower mold is used, and the work placed on the lower mold support part is inserted into the groove of the rotary cam. Negative angle mold that allows the slide cam to slide and mold the workpiece, and after the molding, the rotating cam is rotated and retracted by the automatic return tool so that the molded workpiece can be removed from the lower mold. In turn, after turning When the cam and workpiece entry molding part interfere, a slider that divides a part of the rotation cam of the entry groove is provided so as to be movable in the direction perpendicular to the sliding direction of the slide cam, and the slide cam drive plate is the slider A negative angle forming die in which an intrusion forming portion of a slide cam is entered after being in contact with the bottom surface of the slide cam, and then the intrusion processing is performed to return the slider with an elastic body.

The negative angle mold according to claim 2, wherein the elastic body is a coil spring.

The negative angle mold according to claim 2, wherein the elastic body is a gas spring.

The negative angle mold according to claim 2, wherein the end face of the elastic body is not brought into contact with the rotating cam.

It consists of a lower mold for placing a metal thin workpiece on the support part and an upper mold that descends in a linear direction with respect to the lower mold and abuts the work to form the work, and the edge near the support part A rotating cam provided in the lower die so as to be rotatable, and a slide cam provided with a forming portion and slidably provided facing the rotating cam. After the molding, the rotary cam is rotated and retracted until the work can be taken out from the lower mold, and the automatic return tool provided on the lower mold is used, and the work placed on the lower mold support part is inserted into the groove of the rotary cam. Negative angle mold that allows the slide cam to slide and mold the workpiece, and after the molding, the rotating cam is rotated and retracted by the automatic return tool so that the molded workpiece can be removed from the lower mold. In turn, after turning When the cam and the workpiece forming part of the workpiece interfere with each other, a rotating body obtained by dividing the rotating cam portion of the entering groove is provided so as to be swingable around the rotating shaft, and the operating piece of the slide cam is brought into contact with the rotating body. This is a negative angle forming die that is formed by entering the slide cam entering molding part after forming the entering groove.