JP5237179B2 - Method of partially increasing thickness of press work and apparatus for increasing thickness - Google Patents

Method of partially increasing thickness of press work and apparatus for increasing thickness Download PDF

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JP5237179B2
JP5237179B2 JP2009100672A JP2009100672A JP5237179B2 JP 5237179 B2 JP5237179 B2 JP 5237179B2 JP 2009100672 A JP2009100672 A JP 2009100672A JP 2009100672 A JP2009100672 A JP 2009100672A JP 5237179 B2 JP5237179 B2 JP 5237179B2
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thickening
die
punch
clamp
workpiece
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JP2010247199A (en
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章雅 山本
敏英 青木
明史 仲田
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Yutaka Giken Co Ltd
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Yutaka Giken Co Ltd
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本発明は，端壁と，この端壁の外周から一側方に湾曲状に屈曲する屈曲部と，この屈曲部に連設される円筒部とを備えるプレス製のワークの前記屈曲部の少なくとも一部を増肉する方法及びその増肉装置の改良に関する。 The present invention provides at least one of the bent portions of a press-made workpiece comprising an end wall, a bent portion bent in a curved shape to one side from the outer periphery of the end wall, and a cylindrical portion connected to the bent portion. The present invention relates to a method of increasing a part of the thickness and an improvement of the apparatus for increasing the thickness.

かゝるプレス製ワークの部分増肉方法は，例えば特許文献１に開示されているように，既に知られている。   Such a method for partially increasing the thickness of a pressed workpiece is already known as disclosed in Patent Document 1, for example.

特許第３５９４８４５号公報Japanese Patent No. 3594445

特許文献１に開示されるプレス製ワークの部分増肉方法では，端壁と，この端壁の外周から一側方に湾曲状に屈曲する屈曲部と，この屈曲部に連設される円筒部とを備えるプレス製のワークの，前記端壁外周部を増肉するに当たり，前記ワークの内面に適合するパンチと，前記端壁の外面に適合する内側ダイスと，この内側ダイスに一体的に結合していて前記屈曲部及び円筒部の外周面に適合する外側ダイスとで前記ワークをクランプすると共に，前記パンチには，前記端壁の外周部が臨む環状凹部を形成し，前記円筒部の先端側で前記円筒部に軸方向圧縮荷重を加えることで，前記円筒部の一部を前記凹部に充填して前記端壁の外周部分を増肉するようにしている。 In the partial thickening method for a pressed workpiece disclosed in Patent Document 1, an end wall, a bent portion bent in a curved shape from one outer periphery of the end wall, and a cylindrical portion connected to the bent portion In order to increase the thickness of the outer peripheral portion of the end wall of a press-made workpiece comprising: a punch adapted to the inner surface of the workpiece, an inner die adapted to the outer surface of the end wall, and an integral connection to the inner die The workpiece is clamped with an outer die adapted to the outer peripheral surface of the bent portion and the cylindrical portion, and the punch is formed with an annular recess facing the outer peripheral portion of the end wall, and the tip of the cylindrical portion is formed. By applying an axial compressive load to the cylindrical portion on the side, a part of the cylindrical portion is filled in the concave portion to increase the outer peripheral portion of the end wall.

しかしながら，上記従来の方法では，増肉パンチによりワークの円筒部に軸方向圧縮荷重を加えることで，ワークの屈曲部の一部をパンチ外周の凹部に充填するとき，その凹部に充填される材料の流れを規制するものが存在しないため，その充填により増肉される部分に，座屈による皺が発生し，製品の品質を損なう虞がある。   However, in the conventional method described above, when an axial compression load is applied to the cylindrical part of the workpiece by the thickening punch, when a part of the bent part of the work is filled into the concave part on the outer periphery of the punch, the material filled in the concave part Since there is nothing that regulates the flow of material, buckling due to buckling occurs in the parts that are thickened by the filling, which may impair the quality of the product.

本発明は，かゝる事情に鑑みてなされたもので，前記プレス製ワークの屈曲部の少なくとも一部を，皺の発生を抑えながら増肉し得るようにして，高品質の製品の安定供給を可能にするプレス製ワークの部分増肉方法及びその増肉装置を提供することを目的とする。   The present invention has been made in view of such circumstances, and at least a part of the bent portion of the press-made workpiece can be increased in thickness while suppressing the occurrence of wrinkles, thereby stably supplying a high-quality product. It is an object of the present invention to provide a method for partially thickening a press-made workpiece and an apparatus for thickening the same.

上記目的を達成するために，本発明は，端壁と，この端壁の外周から一側方に湾曲状に屈曲する屈曲部と，この屈曲部に連設される円筒部とを備えるプレス製のワークを用意し，このワークの前記屈曲部の少なくとも一部を増肉するに当たり，前記ワークの内面に適合するクランプパンチと，前記端壁の外面及びそれに連なる前記屈曲部の一部の外周面に適合するクランプダイと，このクランプダイの外周に軸方向摺動可能に嵌合して前記屈曲部の残余の部分及び前記円筒部の外周面に適合する増肉案内ダイとで前記ワークをクランプし，前記円筒部の先端側で前記クランプパンチ及び前記増肉案内ダイ間に形成されるスペースに増肉パンチを挿入し前記円筒部に軸方向圧縮荷重を加えて前記屈曲部を増肉すると共に，該屈曲部の増肉圧力の作用により，前記増肉案内ダイを前記クランプダイに対して後退させることを第１の特徴とする。 In order to achieve the above object, the present invention provides a press product comprising an end wall, a bent portion bent in a curved shape from one outer periphery of the end wall, and a cylindrical portion connected to the bent portion. In order to increase the thickness of at least a part of the bent portion of the workpiece, a clamp punch adapted to the inner surface of the workpiece, an outer surface of the end wall, and an outer peripheral surface of a part of the bent portion connected thereto clamping the workpiece in a compatible and clamp die, compatible thickening guide die to the outer peripheral surface portion and the cylindrical portion of the remainder of the bent outer periphery axially slidably fitted in the clamping die together with, for thickening the bent portion in addition to axial compressive load to the cylindrical portion by inserting the Zoniku punch in the space formed between the clamping punch and said thickening guide die tip side of the cylindrical portion , of thickening pressure of the bent portion The use, the first characterized by retracting the thickening guide die with respect to the clamp die.

また，本発明は，第１の特徴のプレス製ワークの部分増肉方法を実施する増肉装置であって，相互に近接，離反可能に対設されるボルスタ及びラムの一方に第１ダイクッションを介して支持されて前記ワークの内面に適合するクランプパンチと，ボルスタ及びラムの他方に支持されて前記端壁の外面及びそれに連なる前記屈曲部の一部の外周面に適合するクランプダイと，ボルスタ及びラムの他方に第２ダイクッションを介して支持され，前記クランプダイの外周に軸方向摺動可能に嵌合して前記屈曲部の残余の部分及び前記円筒部の外周面に適合する増肉案内ダイと，ボルスタ及びラムの一方に固定的に支持され，前記円筒部の先端側で前記クランプパンチ及び前記増肉案内ダイ間に形成されるスペースに挿入され，前記円筒部の端面に当接し得る増肉パンチとを備え，前記ボルスタ及び前記ラムの相互近接により，前記クランプパンチと前記クランプダイ及び前記増肉案内ダイとで前記ワークをクランプした後，前記第１ダイクッションの圧縮変形に伴ない前記増肉パンチを前記円筒部に向かって押し込んで前記屈曲部を増肉すると共に，該屈曲部の増肉圧力の作用により，前記増肉案内ダイを前記第２ダイクッションの弾発力に抗して後退させるようにしたことを第２の特徴とする。 The present invention also relates to a thickening apparatus for carrying out the partial thickening method for a pressed workpiece of the first feature, wherein the first die cushion is placed on one of a bolster and a ram that are arranged so as to be close to and away from each other. A clamp punch that is supported via the inner surface of the workpiece and that is supported by the other of the bolster and the ram, and that is adapted to the outer surface of the end wall and the outer peripheral surface of a part of the bent portion connected thereto . bolster and is supported through a second die cushion to the other ram, the remaining portion of the bent portion axially slidably fitted on the outer periphery of the clamp die and increase conforms to the outer peripheral surface of the cylindrical portion and meat guiding die is fixedly supported on one of the bolster and ram, is inserted into the clamping punch and the space formed between said thickening guide die tip side of the cylindrical portion, against the end face of the cylindrical portion And a thickening punch may, by mutual proximity of the bolster and the ram, after clamping the workpiece between the said clamping punch clamp die and said thickening guide die, compressive deformation of the first dust cum cushion Accordingly, the thickening punch is pushed toward the cylindrical portion to increase the thickness of the bent portion , and the thickness- increasing guide die is moved by the elastic force of the second die cushion due to the action of the increased thickness of the bent portion. The second feature is that the vehicle is retracted against the force.

また，本発明は，第２の特徴に加えて，前記屈曲部は，前記端壁に連なる湾曲部とこの湾曲部に連なるテーパ部とで構成され，前記クランプダイの外周側の部分は，前記湾曲部に適合すべく下向きに傾斜していることを第３の特徴とする。Further, according to the present invention, in addition to the second feature, the bent portion includes a curved portion connected to the end wall and a tapered portion connected to the curved portion. A third feature is that the head is inclined downward to fit the curved portion.

本発明の第１の特徴によれば，クランプパンチとクランプダイ及び増肉ダイとでワーク全体をクランプした状態で，増肉パンチによりワークの円筒部に軸方向圧縮荷重を加えて，ワークの屈曲部を増肉し，しかも，該屈曲部の増肉圧力の作用により，増肉案内ダイをクランプダイに対して後退させるので，屈曲部の増肉中，その増肉の流れは，増肉案内ダイの内周面に案内されることになり，皺の発生を防ぐことができる。 According to the first feature of the present invention, in a state where the entire workpiece is clamped by the clamp punch, the clamp die, and the thickening die, an axial compressive load is applied to the cylindrical portion of the workpiece by the thickening punch to bend the workpiece. parts by thickening the, moreover, by the action of thickening pressure bent portion, so to retract the thickened guide die with respect to the clamp die, increase in the meat of the bent portion, the flow of the thickening, the thickening guide Guided by the inner peripheral surface of the die, it is possible to prevent the occurrence of wrinkles.

本発明の第２の特徴によれば，増肉パンチがワークの円筒部を突き上げ，圧縮荷重を加えることで，ワークの屈曲部に圧縮力が集中し，円筒部の一部の肉が屈曲部に移行して，その屈曲部を増肉していき，該屈曲部の増肉圧力が増肉案内ダイの内周面に作用することで，増肉案内ダイを第２ダイクッションの弾発力に抗して後退させる。したがって，屈曲部の増肉中，常に，第２ダイクッションの反発力が増肉案内ダイから屈曲部の増肉する部分に働くことになるから，その増肉の流れは，増肉案内ダイの内周面に案内されることになり，座屈を起こすことなく，皺の発生を防ぐことができる。 According to the second feature of the present invention, the thickening punch pushes up the cylindrical portion of the workpiece and applies a compressive load so that the compressive force is concentrated on the bent portion of the workpiece, and a part of the cylindrical portion is bent at the bent portion. the process moves to, the bent portion continue to increase meat, by acting on the inner peripheral surface of the thickened pressure-increasing meat guide die bent portion, the thickness increase guide die spring of the second da cum cushion Retreat against the force. Therefore, in thickened bends, always from will act in a portion repulsive force of the second da ik cushion is thickened bends from thickening guide die, the flow of the thickening, the thickening guide die It will be guided to the inner peripheral surface of, and can prevent the occurrence of wrinkles without buckling.

増肉前のワークの縦断面図。The longitudinal cross-sectional view of the workpiece | work before thickness increase. 上記ワークの屈曲部のテーパ部に，本発明の方法及び装置により増肉を施した状態を示す縦断面図。The longitudinal cross-sectional view which shows the state which thickened the taper part of the bending part of the said workpiece | work by the method and apparatus of this invention. 本発明の増肉装置の縦断側面図で，ワークの取り付け時の状態を示す。The state at the time of the attachment of a workpiece | work is shown with the vertical side view of the thickness increase apparatus of this invention. 上記ワークのクランプ状態を示す，図３との対応図。FIG. 4 is a view corresponding to FIG. 3 showing a clamped state of the workpiece. 図５は図４の５拡大図。5 is an enlarged view of 5 in FIG. 上記ワークの部分増肉開始時の状態を示す，図５との対応図。FIG. 6 is a view corresponding to FIG. 5 showing a state at the start of partial thickening of the workpiece. 上記ワークの部分増肉終了状態を示す，図６との対応図。FIG. 7 is a view corresponding to FIG. 6, showing a state of completion of partial thickening of the workpiece.

本発明の実施の形態を，添付図面に示す本発明の好適な実施例に基づいて以下に説明する。   Embodiments of the present invention will be described below on the basis of preferred embodiments of the present invention shown in the accompanying drawings.

先ず，金属平板に絞り加工を加えて，図１に示すようなワークＷを成形しておく。そのワークＷは，端壁１と，この端壁１の外周から一側方に湾曲状に屈曲する屈曲部２と，この屈曲部２に連設される円筒部３とからなる椀状をなしており，さらに，上記屈曲部２は，端壁１側に連なる湾曲部２ａと，この湾曲部２ａを円筒部３に連結するテーパ部２ｂとで構成される。 First, drawing work is applied to a metal flat plate to form a workpiece W as shown in FIG. The workpiece W has a bowl-like shape including an end wall 1, a bent portion 2 bent in a curved shape from the outer periphery of the end wall 1, and a cylindrical portion 3 connected to the bent portion 2. Further, the bent portion 2 is composed of a curved portion 2 a continuous to the end wall 1 side and a tapered portion 2 b that connects the curved portion 2 a to the cylindrical portion 3.

本発明の実施例は，このワークＷの屈曲部２，特にテーパ部２ｂに，図２に示すような増肉を施すもので，その増肉装置５について，図３〜図７を参照しながら以下に説明する。   In the embodiment of the present invention, the bent portion 2 of the workpiece W, in particular, the tapered portion 2b is subjected to a thickening as shown in FIG. 2, and the thickening device 5 will be described with reference to FIGS. This will be described below.

図３において，プレス機械のボルスタ６の上方には，図示しない動力源により昇降駆動されるラム７が配設される。ボルスタ６の上面には，下部ベース８及び下部ダイホルダ９が順次重ねて固着され，その下部ダイホルダ９にクランプパンチ１０が複数本の第１スプールリテーナ１１（図には１本のみを示す。）を介して一定距離昇降自在に連結され，このクランプパンチ１０は，第１ダイクッション１２の弾発力により上方に付勢される。このクランプパンチ１０は，前記ワークＷの内面全体に適合する形状を有しており，これに前記ワークＷが嵌合してセットされるようになっている。   In FIG. 3, a ram 7 that is driven up and down by a power source (not shown) is disposed above the bolster 6 of the press machine. A lower base 8 and a lower die holder 9 are sequentially stacked and fixed on the upper surface of the bolster 6, and a plurality of first spool retainers 11 (only one is shown in the figure) are clamp punches 10 on the lower die holder 9. And the clamp punch 10 is urged upward by the elastic force of the first die cushion 12. The clamp punch 10 has a shape that fits the entire inner surface of the workpiece W, and the workpiece W is fitted and set therein.

また，下部ダイホルダ９には，クランプパンチ１０の外周に相対摺動可能に嵌合する増肉パンチ１３がボルト１４により固着され，この増肉パンチ１３の上端部は，増肉案内ダイ２９の下降時，それとクランプパンチ１０との間に形成される環状スペース１５（図５参照）に嵌合して，前記ワークＷの円筒部３の下端面に対向するようになっている。   Further, a thickening punch 13 that is fitted to the outer periphery of the clamp punch 10 so as to be relatively slidable is fixed to the lower die holder 9 with a bolt 14. At this time, it is fitted into an annular space 15 (see FIG. 5) formed between it and the clamp punch 10 so as to face the lower end surface of the cylindrical portion 3 of the workpiece W.

一方，ラム７の下面には，上部ベース２０及びスライダ２１が順次重ねて固着され，そのスライダ２１は，下部ベース８から起立した複数本のガイドポスト２２（図には１本のみを示す。）に昇降自在に支持される。また，スライダ２１には，第１上部ダイホルダ２３が固着連結され，この第１上部ダイホルダ２３にクランプダイ２４がボルト２５により固着される。このクランプダイ２４は，前記ワークＷの端壁１の外面に適合する下面を持っていると共に，該下面の外周側の部分は，湾曲部２ａの外周面に適合すべく下向きに傾斜している。 On the other hand, an upper base 20 and a slider 21 are sequentially stacked and fixed on the lower surface of the ram 7, and the slider 21 is a plurality of guide posts 22 standing from the lower base 8 (only one is shown in the figure). It is supported so that it can be raised and lowered. A first upper die holder 23 is fixedly connected to the slider 21, and a clamp die 24 is fixed to the first upper die holder 23 with a bolt 25. The clamp die 24 has a lower surface that conforms to the outer surface of the end wall 1 of the workpiece W , and an outer peripheral portion of the lower surface is inclined downward to conform to the outer peripheral surface of the curved portion 2a. .

さらに，スライダ２１には，第１上部ダイホルダ２３を囲繞する第２上部ダイホルダ２６が複数本の第２スプールリテーナ２７（図には１本のみを示す。）を介して一定距離昇降自在に連結され，この第２上部ダイホルダ２６は，第２ダイクッション２８の弾発力により下方に付勢される。この第２上部ダイホルダ２６に増肉案内ダイ２９がボルト３０により固着される。この増肉案内ダイ２９は，前記ワークＷのテーパ部２ｂ及び円筒部３の外周面に適合する内周面を有している。   Further, a second upper die holder 26 surrounding the first upper die holder 23 is connected to the slider 21 via a plurality of second spool retainers 27 (only one is shown in the figure) so as to be movable up and down by a predetermined distance. The second upper die holder 26 is biased downward by the elastic force of the second die cushion 28. A thickening guide die 29 is fixed to the second upper die holder 26 with bolts 30. The thickening guide die 29 has an inner peripheral surface that matches the outer peripheral surface of the tapered portion 2 b and the cylindrical portion 3 of the workpiece W.

次に，この第１実施例の作用について説明する。
〔ワークＷの取り付け〕図３参照
先ず，ラム７の上昇により，スライダ２１と共にクランプダイ２４及び増肉案内ダイ２９をも上昇させ，クランプパンチ１０の外周に，図１に示すワークＷを被せる。このとき，クランプパンチ１０は，第１ダイクッション１２の弾発力により，第１スプールリテーナ１１で規制される所定の上昇位置まで押し上げられ，下部ダイホルダ９との間に所定の間隙Ｓ１ができている。
〔ワークのクランプ開始〕図３参照
次に，ラム７の下降により，スライダ２１と共にクランプダイ２４及び及び増肉案内ダイ２９を下降させていくと，クランプダイ２４がワークＷの端壁１から湾曲部２ａにかけてそれらの外面，外周面に密着，押圧し，同時に増肉案内ダイ２９がワークＷのテーパ部２ｂ及び円筒部３の外周面に嵌合し，これらクランプダイ２４及び増肉案内ダイ２９とクランプパンチ１０との協働によりワークＷを，その内外全面に亙りクランプする。
〔ワークのクランプ強化〕図４及び図５参照
さらに，ラム７の下降が進むと，その下降力がクランプダイ２４及び増肉案内ダイ２９からワークＷを介してクランプパンチ１０に伝達して，それを押圧するので，クランプパンチ１０は，第１ダイクッション１２を圧縮しつゝ下降し，第１ダイクッション１２の反発力により，ワークＷに対するクランプ力が強化される。この間に，増肉パンチ１３の上端部は，クランプパンチ１０の外周面と増肉案内ダイ２９の内周面との間に形成される環状スペース１５に嵌合していき，ワークＷの円筒部３下端面に対向する。
〔増肉開始〕図６参照
さらに，ラム７の下降が進むと，クランプダイ２４及び増肉案内ダイ２９，ワークＷ及びクランプパンチ１０全体が第１ダイクッション１２をさらに圧縮して下がり，下部ダイホルダ９に固定された不動の増肉パンチ１３の上端がワークＷの円筒部３下端面に突き当たる。この段階では，増肉案内ダイ２９は，第２ダイクッション２８の弾発力により，第２スプールリテーナ２７で規制される下降位置へ付勢され，スライダ２１の下面との間に所定の間隙Ｓ２を形成している。一方，クランプパンチ１０と下部ダイホルダ９との間には，クランプパンチ１０の更なる下降を許容する間隙Ｓ１′が残存している。
〔増肉〕図７参照
さらに，ラム７の下降が進むと，クランプダイ２４及び増肉案内ダイ２９，ワークＷ及びクランプパンチ１０全体が第１ダイクッション１２をさらに圧縮して下がり，それに伴ない，増肉パンチ１３が相対的にワークＷの円筒部３を突き上げ，圧縮荷重を加えることになる。このとき，ワークＷの円筒部３は，増肉案内ダイ２９の内周面の円筒面により拡径が規制される結果，ワークＷのテーパ部２ｂに圧縮力が集中し，円筒部３の一部の肉がテーパ部２ｂに移行して，そのテーパ部２ｂを増肉していき，該テーパ部２ｂの増肉圧力が増肉案内ダイ２９の内周面のテーパ面に作用することで，増肉案内ダイ２９を第２ダイクッション２８の弾発力に抗して後退させる。 Next, the operation of the first embodiment will be described.
[Attachment of Work W] See FIG. 3 First, as the ram 7 rises, the clamp die 24 and the thickening guide die 29 are raised together with the slider 21, and the work W shown in FIG. At this time, the clamp punch 10 is pushed up to a predetermined rising position regulated by the first spool retainer 11 by the elastic force of the first die cushion 12, and a predetermined gap S1 is formed between the clamp punch 10 and the lower die holder 9. Yes.
[Workpiece clamping start] See FIG. 3 Next, when the ram 7 is lowered, the clamp die 24 and the thickening guide die 29 are lowered together with the slider 21, and the clamp die 24 is bent from the end wall 1 of the workpiece W. their outer surfaces over the parts 2a, in close contact with the outer peripheral surface, pressing, thickened guide die 29 is fitted to the outer peripheral surface of the tapered portion 2b and the cylindrical portion 3 of the workpiece W at the same time, these clamps die 24 and thickened guide die 29 And the clamp punch 10 are used to clamp the workpiece W across the entire surface.
[Strengthening work clamp] See FIGS. 4 and 5. Further, when the ram 7 descends, the descending force is transmitted from the clamp die 24 and the thickening guide die 29 to the clamp punch 10 via the work W, Therefore, the clamp punch 10 descends while compressing the first die cushion 12, and the repulsive force of the first die cushion 12 reinforces the clamping force against the workpiece W. During this time, the upper end portion of the thickening punch 13 is fitted into an annular space 15 formed between the outer peripheral surface of the clamp punch 10 and the inner peripheral surface of the thickening guide die 29, and the cylindrical portion of the workpiece W 3 Opposes the lower end surface.
[Start of thickening] Refer to FIG. 6 Further, as the ram 7 descends, the clamp die 24 and the thickening guide die 29, the workpiece W and the clamp punch 10 as a whole further compress and lower the first die cushion 12, and the lower die holder The upper end of the stationary thickening punch 13 fixed to 9 abuts against the lower end surface of the cylindrical portion 3 of the workpiece W. At this stage, the thickening guide die 29 is urged to the lowered position regulated by the second spool retainer 27 by the elastic force of the second die cushion 28, and a predetermined gap S2 is formed between the lower surface of the slider 21. Is forming. On the other hand, a gap S <b> 1 ′ that allows the clamp punch 10 to be further lowered remains between the clamp punch 10 and the lower die holder 9.
[Increase in thickness] See FIG. 7. Further, as the ram 7 descends, the clamp die 24, the increase guide die 29, the workpiece W and the clamp punch 10 as a whole further compress and lower the first die cushion 12, and accordingly The thickening punch 13 relatively pushes up the cylindrical portion 3 of the workpiece W and applies a compressive load. At this time, the expansion of the cylindrical portion 3 of the workpiece W is restricted by the cylindrical surface of the inner peripheral surface of the thickening guide die 29. As a result, the compressive force is concentrated on the tapered portion 2b of the workpiece W, and The thickness of the portion shifts to the tapered portion 2b, and the tapered portion 2b is increased in thickness, and the increased pressure of the tapered portion 2b acts on the tapered surface of the inner peripheral surface of the increased thickness guide die 29, The thickening guide die 29 is retracted against the resilience of the second die cushion 28.

したがって，テーパ部２ｂの増肉中，常に，第２ダイクッション２８の反発力が増肉案内ダイ２９からテーパ部２ｂの増肉する部分に働くことになるから，その増肉の流れは，増肉案内ダイ２９の内周面に案内されることになり，座屈を起こすことなく，皺の発生を防ぐことができる。
〔増肉終了〕図７参照
テーパ部２ｂの増肉は，図示例では，クランプパンチ１０が下部ダイホルダ９の上面に当接して，それ以上の下降が不能となることで終了するが，第２上部ダイホルダ２６がスライダ２１に当接して，増肉案内ダイ２９のそれ以上の後退が不能となることで増肉を終了させるようにすることもできる。
〔増肉後のワークＷの取り出し〕図３参照
増肉終了後，ラム７を原位置に上昇して，クランプダイ２４及び増肉案内ダイ２９をクランプパンチ１０から遠く離し，クランプパンチ１０もしくは増肉案内ダイ２９に付着したワークＷを取り出す。その際，必要に応じてワークＷをクランプパンチ１０もしくは増肉案内ダイ２９から積極的に剥離させる公知のノックアウト機構を用いる。 Therefore, during the increase in the thickness of the tapered portion 2b, the repulsive force of the second die cushion 28 always acts on the portion where the tapered portion 2b is increased from the increased thickness guide die 29. Therefore, the flow of the increased thickness is increased. It will be guided to the inner peripheral surface of the meat guide die 29, and the occurrence of wrinkles can be prevented without causing buckling.
[End of Thickening] See FIG. 7 In the illustrated example, the thickening of the taper portion 2b ends when the clamp punch 10 comes into contact with the upper surface of the lower die holder 9 and cannot be lowered any further. The upper die holder 26 comes into contact with the slider 21 and the thickening guide die 29 cannot be further retracted, so that the thickening can be terminated.
[Removal of workpiece W after thickening] Refer to FIG. 3 After the thickening is completed, the ram 7 is raised to the original position, and the clamp die 24 and the thickening guide die 29 are moved away from the clamp punch 10 and the clamp punch 10 or the thickening is increased. The workpiece W adhered to the meat guide die 29 is taken out. At this time, a known knockout mechanism that positively peels the workpiece W from the clamp punch 10 or the thickening guide die 29 is used as necessary.

かくして，図２に示すような，皺を生じることなく増肉されたテーパ部２ｂを持った高品質の製品を得ることができる。   Thus, it is possible to obtain a high-quality product having the tapered portion 2b which is thickened without causing wrinkles as shown in FIG.

本発明は上記実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。例えば，第１及び第２ダイクッション１２，２８は，ガス式，ばね式，油圧式，空気式等，その形式は自由である。また，クランプパンチ１０及び増肉パンチ１３をラム７側に，クランプダイ２４及び増肉案内ダイ２９をボルスタ６側に取り付けることもできる。また，増肉後のワークＷにおいては，必要に応じて端壁１，屈曲部２及び円筒部３等の各部に更なる加工を加えることもできる。   The present invention is not limited to the above embodiment, and various design changes can be made without departing from the scope of the invention. For example, the first and second die cushions 12 and 28 can be of any type, such as a gas type, a spring type, a hydraulic type, and a pneumatic type. Further, the clamp punch 10 and the thickening punch 13 can be attached to the ram 7 side, and the clamp die 24 and the thickening guide die 29 can be attached to the bolster 6 side. Further, in the workpiece W after the thickness increase, further processing can be applied to each part such as the end wall 1, the bent part 2 and the cylindrical part 3 as necessary.

Ｗ・・・・・・ワーク
１・・・・・・端壁
２・・・・・・屈曲部
２ａ・・・・・湾曲部
２ｂ・・・・・テーパ部
３・・・・・・円筒部
６・・・・・・ボルスタ
７・・・・・・ラム
１０・・・・・クランプパンチ
１２・・・・・第１ダイクッション
１３・・・・・増肉パンチ
１５・・・・・スペース
２４・・・・・クランプダイ
２８・・・・・第２ダイクッション
２９・・・・・増肉案内ダイ W ··· Work 1 ··· End wall 2 ··· Bending portion 2a ··· Curved portion 2b · · · Tapered portion 3 ··· Cylindrical 6 ··· Bolster 7 ··· Ram 10 · · · Clamp punch 12 · · · First die cushion 13 · · · Thickening punch 15 · · · space 24 ..... clamp die 28 ..... second dialog cushion 29 ..... thickening guide die

Claims (3)

端壁（１）と，この端壁（１）の外周から一側方に湾曲状に屈曲する屈曲部（２）と，この屈曲部（２）に連設される円筒部（３）とを備えるプレス製のワーク（Ｗ）を用意し，このワーク（Ｗ）の前記屈曲部（２）の少なくとも一部を増肉するに当たり，
前記ワーク（Ｗ）の内面に適合するクランプパンチ（１０）と，前記端壁（１）の外面及びそれに連なる前記屈曲部（２）の一部の外周面に適合するクランプダイ（２４）と，このクランプダイ（２４）の外周に軸方向摺動可能に嵌合して前記屈曲部（２）の残余の部分及び前記円筒部（３）の外周面に適合する増肉案内ダイ（２９）とで前記ワーク（Ｗ）をクランプし，前記円筒部（３）の先端側で前記クランプパンチ（１０）及び前記増肉案内ダイ（２９）間に形成されるスペース（１５）に増肉パンチ（１３）を挿入し前記円筒部（３）に軸方向圧縮荷重を加えて前記屈曲部（２）を増肉すると共に，該屈曲部の増肉圧力の作用により，前記増肉案内ダイ（２９）を前記クランプダイ（２４）に対して後退させることを特徴とする，プレス製ワークの部分増肉方法。 An end wall (1), a bent portion (2) bent in a curved shape from the outer periphery of the end wall (1), and a cylindrical portion (3) connected to the bent portion (2) In order to increase the thickness of at least a part of the bent part (2) of the work (W)
A clamp punch (10) adapted to the inner surface of the workpiece (W), a clamp die (24) adapted to the outer surface of the end wall (1) and a part of the outer peripheral surface of the bent portion (2) connected thereto , the bent portion fitted so as to be axially slidable on the outer circumference of the clamp die (24) and the remaining portion and said cylindrical portion (2) (3) fits thickening guide die to the outer peripheral surface of (29) in the clamped workpiece (W), said cylindrical portion (3) of the the tip end clamping punch (10) and said thickening guide die (29) thickening punch space (15) formed between (13 ) To increase the thickness of the bent portion (2) by applying an axial compressive load to the cylindrical portion (3), and the increased thickness guide die (29) is moved by the action of the increased thickness of the bent portion. and wherein the retracting relative to said clamp die (24), up Part thickening method of the scan-made work. 請求項１記載のプレス製ワークの部分増肉方法を実施する増肉装置であって，
相互に近接，離反可能に対設されるボルスタ（６）及びラム（７）の一方に第１ダイクッション（１２）を介して支持されて前記ワーク（Ｗ）の内面に適合するクランプパンチ（１０）と，ボルスタ（６）及びラム（７）の他方に支持されて前記端壁（１）の外面及びそれに連なる前記屈曲部（２）の一部の外周面に適合するクランプダイ（２４）と，ボルスタ（６）及びラム（７）の他方に第２ダイクッション（２８）を介して支持され，前記クランプダイ（２４）の外周に軸方向摺動可能に嵌合して前記屈曲部（２）の残余の部分及び前記円筒部（３）の外周面に適合する増肉案内ダイ（２９）と，ボルスタ（６）及びラム（７）の一方に固定的に支持され，前記円筒部（３）の先端側で前記クランプパンチ（１０）及び前記増肉案内ダイ（２９）間に形成されるスペース（１５）に挿入され，前記円筒部（３）の端面に当接し得る増肉パンチ（１３）とを備え，
前記ボルスタ（６）及び前記ラム（７）の相互近接により，前記クランプパンチ（１０）と前記クランプダイ（２４）及び前記増肉案内ダイ（２９）とで前記ワーク（Ｗ）をクランプした後，前記第１ダイクッション（１２）の圧縮変形に伴ない前記増肉パンチ（１３）を前記円筒部（３）に向かって押し込んで前記屈曲部（２）を増肉すると共に，該屈曲部の増肉圧力の作用により，前記増肉案内ダイ（２９）を前記第２ダイクッション（２８）の弾発力に抗して後退させるようにしたことを特徴とする，プレス製ワークの増肉装置。 A thickening device for carrying out the partial thickening method for a pressed workpiece according to claim 1,
A clamp punch (10) which is supported by one of a bolster (6) and a ram (7) which are arranged so as to be close to each other and can be separated from each other via a first die cushion (12) and fits the inner surface of the workpiece (W). And a clamp die (24) supported by the other of the bolster (6) and the ram (7) and adapted to the outer surface of the end wall (1) and the outer peripheral surface of a part of the bent portion (2) connected thereto. The bolster (6) and the ram (7) are supported via the second die cushion (28) and fitted to the outer periphery of the clamp die (24) so as to be axially slidable. remaining portion and said cylindrical portion of) the (compatible thickening guide die to the outer peripheral surface of 3) (29) is fixedly supported on one of the bolster (6) and ram (7), the cylindrical portion (3 the clamping punch (10) and said thickening guide da at the distal end side of) (29) is inserted into the space (15) formed between, and a thickening punch (13) to the end face may contact with the cylindrical portion (3),
After clamping by mutual proximity, the workpiece out with the said clamp die and clamping punch (10) (24) and said thickening guide die (29) and (W) of the bolster (6) and the ram (7), while thickening the bent portion (2) a companion without the thickening punch (13) is pushed toward the cylindrical portion (3) to the compression deformation of the first da microphone cushion (12), the bent portion Thickening device for press work, characterized in that the thickening guide die (29) is retracted against the resilient force of the second die cushion (28) by the action of the thickening pressure. . 前記屈曲部（２）は，前記端壁（１）に連なる湾曲部（２ａ）とこの湾曲部（２ａ）に連なるテーパ部（２ｂ）とで構成され，前記クランプダイ（２４）の外周側の部分は，前記湾曲部（２ａ）の外周面に適合すべく下向きに傾斜していることを特徴とする，請求項２に記載のプレス製ワークの増肉装置。The bent portion (2) is composed of a curved portion (2a) continuous with the end wall (1) and a tapered portion (2b) continuous with the curved portion (2a), and is provided on the outer peripheral side of the clamp die (24). The apparatus for thickening a press-made workpiece according to claim 2, characterized in that the portion is inclined downward to fit the outer peripheral surface of the curved portion (2a).
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