JP3547862B2 - Forming method of draw-formed product having bent flange - Google Patents
Forming method of draw-formed product having bent flange Download PDFInfo
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- JP3547862B2 JP3547862B2 JP23170995A JP23170995A JP3547862B2 JP 3547862 B2 JP3547862 B2 JP 3547862B2 JP 23170995 A JP23170995 A JP 23170995A JP 23170995 A JP23170995 A JP 23170995A JP 3547862 B2 JP3547862 B2 JP 3547862B2
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- 238000000034 method Methods 0.000 title claims description 19
- 239000011324 bead Substances 0.000 claims description 62
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000000465 moulding Methods 0.000 claims description 10
- 238000005452 bending Methods 0.000 claims description 8
- 238000009966 trimming Methods 0.000 claims description 8
- 238000007493 shaping process Methods 0.000 claims 1
- 230000037303 wrinkles Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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Description
【０００１】
【発明の属する技術分野】
本発明は、周縁部に折曲フランジを有する成形品を絞り成形するための方法に関する。【従来の技術】
従来、鋼板等の金属板よりなるブランクから成形品を絞り成形する際に、金型に設けたビード溝及びビード突起でブランクを挟圧してビードを成形することにより、絞り成形時におけるブランクの周縁部の滑りを規制して成形品に皺や割れが発生するのを防止していた。
【０００２】
【発明が解決しようとする課題】
上記ビードは成形品の周縁の不要部を切断除去する際に該不要部の一部としてスクラップにされるため、ビードの面積分だけ材料の歩留りが減少する問題があった。
【０００３】
本発明は前述の事情に鑑みてなされたもので、絞り成形を行う際に材料の歩留りを向上させることを目的とする。
【０００４】
【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の発明は、下型及び上型でブランクを挟圧して絞り成形を行う際に、それら型のビード溝とビード突起とでブランクを挟圧することにより、絞り成形時におけるブランク周縁部の滑りを規制するようにした、折曲フランジを有する絞り成形品の成形方法において、前記絞り成形の際には、前記ビードが、成形品部位及び該成形品部位の周縁の非成形品部位に跨がるように成形されるドロー工程と、前記ビードの一部を成形品部位側に残して該成形品部位から非成形品部位を切断除去するトリム工程と、そのトリム工程で成形品部位側に残されたビードの残り部分を平坦に延ばすと同時に、該残り部分を含む成形品部位の周縁を折り曲げて折曲フランジを成形するベンド工程とを備えたことを特徴とする。
【０００５】
また請求項２の発明は、下型及び上型でブランクを挟圧して絞り成形を行う際に、それら型のビード溝とビード突起とでブランクを挟圧することにより、絞り成形時におけるブランク周縁部の滑りを規制するようにした、折曲フランジを有する絞り成形品の成形方法において、前記絞り成形の際には、前記ビードが、成形品部位及び該成形品部位の周縁の非成形品部位に跨がるように成形されるドロー工程と、前記ビードの一部を成形品部位側に残して該成形品部位から非成形品部位を切断除去するトリム工程と、そのトリム工程で成形品部位側に残されたビードの残り部分を平坦に延ばすリストライク工程と、前記ビードの前記残り部分を含む成形品部位の周縁を折り曲げて折曲フランジを成形するベンド工程とを備えたことを特徴とする。
【０００６】
また請求項３の発明は、請求項１又は２の上記各特徴に加えて、トリム工程で成形品部位側に残されたビードの折り曲げ角度が９０°未満であることを特徴とする。
【０００７】
【発明の実施の形態】
以下、本発明の実施の形態を、添付図面に示した本発明の実施例に基づいて説明する。 図１〜図３は本発明の第１実施例を示すもので、図１はドロー金型の縦断面図、図２は図１に対応する作用説明図、図３は各工程の説明図である。
【０００８】
図１に示すように、鋼板のブランクＳを絞り成形するドロー金型Ｄは、固定型である下型１と、この下型１に対して昇降する可動型である上型２と、クッションピン３，３を介して下型１の外周に昇降自在に配置されたブランクホルダー４とを備える。下型１の上面と上型２の中央部下面とに、相互に対向する成形面５，６が形成されるとともに、ブランクホルダー４の上面と上型２の周縁部下面とに、相互に対向する皺押え面７，８が形成される。ブランクホルダー４の皺押え面７にはビード溝７1 が凹設され、また上型２の皺押え面８には前記ビード溝７1 に嵌合するビード突起８1 が突設される。
【０００９】
次に、前述の構成を備えた本発明の実施例の作用について説明する。
【００１０】
先ず、ドロー工程において、型開きした金型Ｄの下型１及び上型２間にブランクＳを配置して型閉めすると、図２に示すように下型１の成形面５及び上型２の成形面６間にブランクＳが挟圧されて絞り成形される。このとき、ブランクＳの周縁部をブランクホルダー４の皺押え面７に設けたビード溝７1 と上型２の皺押え面８に設けたビード突起８1 とで挟圧することにより、ブランクＳの周縁部が中央部に引かれて皺が発生することが防止される。
【００１１】
図３（Ａ）は前記ドロー工程を経た成形品Ｗを示すもので、その成形品Ｗは中央の成形品部位Ｗ1 と周縁の非成形品部位Ｗ2 とからなり、成形品部位Ｗ1 及び非成形品部位Ｗ2 の境界は前記ビード溝７1 及びビード突起８1 により成形された断面台形のビードＢの略中央に設定される。
【００１２】
続いて、図３（Ｂ）に示すトリム工程において成形品部位Ｗ1 から非成形品部位Ｗ2 が切断除去される。非成形品部位Ｗ2 を切断除去したとき、成形品部位Ｗ1 にはビードＢの内側の一部が一体に残される。続いて、図３（Ｃ）に示すリストライク工程において成形品部位Ｗ1 に残ったビードＢの残り部分が平坦になるようにプレスする。このとき、成形品部位Ｗ1 に残ったビードＢの残り部分の２か所の折り曲げ角度α，βは共に９０°未満とされているため、前記リストライク工程を容易に行うことができ、しかもリストライク工程におけるビードＢの伸び率を抑えて仕上がりを向上させることができる。
【００１３】
次に、図３（Ｄ）に示すベンド工程において、成形品部位Ｗ1 の周縁を直角に折り曲げることにより折曲フランジＦが成形される。リストライク工程で予めビードＢの残り部分を平坦に成形しているので、ベンド工程における折曲フランジＦの成形に支障が生じることはない。またビードＢに対応する成形品部位Ｗ1 の周縁に僅かな傷が残っても、そこに折曲フランジＦを成形することにより前記傷を目立たなくすることができる。
【００１４】
而して、従来は非成形品部位Ｗ2 の一部としてスクラップにされていたビードＢの一部を成形品部位Ｗ1 側に残し、その残り部分を成形品部位Ｗ1 の折曲フランジＦとして利用している（即ち折曲フランジＦの先端部は、該ビードＢの残り部分で形成される）ので、ビードＢを全てスクラップにする場合に比べて材料の歩留りが向上する。
【００１５】
図４は本発明の第２実施例を示すものである。図３及び図４を比較すると明らかなように、第２実施例はビードＢの形状において第１実施例と異なっている。即ち、第２実施例は非成形品部位Ｗ2 に含まれるビードＢの一部が直角に折り曲げられているので、ドロー成形時に非成形品部位Ｗ2 を強固に固定して皺抑え効果を高めることができる。一方、成形品部位Ｗ1 に含まれるビードＢの残り部分が緩く折り曲げられているので、リストライク工程においてビードＢを平坦に延ばす加工が容易である。
【００１６】
以上、本発明の実施例を詳述したが、本発明はその要旨を逸脱しない範囲で種々の設計変更を行うことができる。
【００１７】
例えば、実施例ではトリム工程とベンド工程との間にリトライク工程を設けているが、前記リトライク工程を廃止し、ベンド工程において成形品部位Ｗ1 に含まれるビードＢの一部を直接延ばすと同時に折り曲げて折曲フランジＦを成形することも可能であり、このようにすれば工程数を削減することができる。
【００１８】
【発明の効果】
以上のように請求項１，２の各発明によれば、ドロー工程でブランクの成形品部位及び非成形品部位に跨がるようにビードを成形し、続くトリム工程で前記ビードの一部を成形品部位側に残して非成形品部位を切断除去し、次いでそのトリム工程で成形品部位側に残されたビードの残り部分を延ばすと共に、その残り部分を含む成形品部位の周縁を折り曲げて折曲フランジを成形するので、ブランク周縁部の滑りを規制すべく成形されるビードの一部（上記残り部分）を成形品の一部として利用することが可能となって材料の歩留りが向上する。またビードの成形時に成形品部位の周縁に僅かな傷ができても、そこに折曲フランジが成形されるので前記傷を目立たなくすることができる。
【００１９】
また特に請求項１の発明によれば、ベンド工程においてビードの上記残り部分を平坦に延ばすと同時に折曲フランジを成形するので、工程数を最小限に抑えて加工コストを削減することができる。
【００２０】
また特に請求項２の発明によれば、トリム工程とベンド工程との間に、ビードの上記残り部分を平坦に延ばすリストライク工程を備えたことにより、ビードの上記残り部分の影響を受けずにベンド工程を容易に行うことができ、しかも折曲フランジの仕上がりも向上する。
【００２１】
また特に請求項３の発明によれば、トリム工程で成形品部位側に残されたビードの折り曲げ角度が９０°未満であるため、リストライク工程においてビードを平坦に延ばす作業が容易である。
【図面の簡単な説明】
【図１】ドロー金型の縦断面図
【図２】図１に対応する作用説明図
【図３】各工程の説明図
【図４】第２実施例に係る、前記図３に対応する図
【符号の説明】
１ 下型
２ 上型
７ 1 ビード溝
８ 1 ビード突起
Ｂ ビード
Ｆ 折曲フランジ
Ｓ ブランク
Ｗ1 成形品部位
Ｗ2 非成形品部位[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for drawing a molded article having a bent flange on a peripheral edge. [Prior art]
Conventionally, when drawing a molded product from a blank made of a metal plate such as a steel plate, by pressing the blank with bead grooves and bead projections provided in a mold to form a bead, the peripheral edge of the blank at the time of drawing is formed. The sliding of the part was restricted to prevent wrinkles and cracks from occurring in the molded product.
[0002]
[Problems to be solved by the invention]
Since the bead is scrapped as a part of the unnecessary portion when cutting and removing the unnecessary portion on the peripheral edge of the molded product, there is a problem that the yield of the material is reduced by the area of the bead.
[0003]
The present invention has been made in view of the above circumstances, and has as its object to improve the yield of materials when performing drawing.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 is to press the blank with the lower die and the upper die to perform drawing, by pressing the blank between the bead groove and the bead protrusion of the die, In a method for forming a drawn product having a bent flange, wherein the slip of the blank peripheral portion at the time of drawing is regulated, in the draw forming, the bead is formed of the formed product part and the formed product part. a draw step to a non-molded article sites periphery Ru is formed so as to extend over the trim step of cutting and removing the non-molded article sites from the molded article sites a portion of the bead, leaving the molded product portion side, that A bend step of flattening the remaining part of the bead left on the molded product part side in the trimming step and bending the peripheral edge of the molded product part including the remaining part to form a bent flange. And
[0005]
Further, the invention according to claim 2 is characterized in that when the blank is pressed by the lower mold and the upper mold and the drawing is performed, the blank is pressed by the bead grooves and the bead projections of the mold, so that the peripheral portion of the blank at the time of the drawing is formed. In the method of forming a drawn molded article having a bent flange, the bead is formed at a molded article part and at a non-molded article part at a peripheral edge of the molded article part. A draw step of being formed so as to straddle; a trim step of cutting and removing a non-molded part from the molded part while leaving a part of the bead on the molded part side; and a molded part side in the trim step. And a bend step of forming a bent flange by bending a peripheral edge of a molded part including the remaining portion of the bead.
[0006]
According to a third aspect of the present invention, in addition to the features described in the first or second aspect , the bend angle of the bead left on the side of the molded article in the trimming step is less than 90 °.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on examples of the present invention shown in the accompanying drawings. 1 to 3 show a first embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a draw mold, FIG. 2 is an operation explanatory view corresponding to FIG. 1, and FIG. 3 is an explanatory view of each step. is there.
[0008]
As shown in FIG. 1, a draw die D for drawing and forming a blank S of a steel plate includes a lower die 1 that is a fixed die, an upper die 2 that is a movable die that moves up and down with respect to the lower die 1, and a cushion pin. And a blank holder 4 arranged on the outer periphery of the lower mold 1 via the third and third members so as to be able to move up and down. Molding
[0009]
Next, the operation of the embodiment of the present invention having the above-described configuration will be described.
[0010]
First, in the draw step, when the blank S is placed between the lower mold 1 and the upper mold 2 of the opened mold D and the mold is closed, the molding surface 5 and the upper mold 2 of the lower mold 1 are closed as shown in FIG. The blank S is sandwiched between the
[0011]
3 (A) is intended to indicate a shaped article W which has undergone the draw step, the molded product W is made from the center of the molded article portions W 1 and the peripheral non moldings site W 2 Prefecture, moldings parts W 1 and boundary of the non-molded article sites W 2 is set substantially in the center of the bead B of a trapezoidal cross section which is formed by the bead groove 71 and the bead projection 81.
[0012]
Subsequently, the non-molded article sites W 2 from the article portion W 1 in the trimming step shown in FIG. 3 (B) are cut and removed. When cut remove non moldings site W 2, a portion of the inner bead B is left integrally molded product site W 1. Subsequently, the remaining portion of the bead B left in the molded article portions W 1 in restriking step shown in FIG. 3 (C) is pressed to the flat. At this time, two of the bending angle of the remainder of the remaining bead B in the molded article portions W 1 alpha, beta because it is both at less than 90 °, can be easily performed the restrike step, moreover The finish can be improved by suppressing the elongation of the bead B in the restrike process.
[0013]
Then, in a bending step shown in FIG. 3 (D), folding the flange F is formed by folding the peripheral edge of the molded article portions W 1 at right angles. Since the rest of the bead B is previously formed flat in the restriking process, there is no problem in forming the bent flange F in the bend process. Also remains slight scratches on the periphery of the molded article portions W 1 corresponding to the bead B, it is possible to obscure the wound by forming a bent flange F therein.
[0014]
And Thus, conventionally a part of the bead B, which has been scrapped leaving the molded article portions W 1 side as part of the non-molded article sites W 2, the remainder of that of the molded article portions W 1 folded flange Since it is used as F ( that is, the tip of the bent flange F is formed by the remaining part of the bead B ) , the yield of the material is improved as compared with the case where all the beads B are scrapped.
[0015]
FIG. 4 shows a second embodiment of the present invention. As is apparent from a comparison between FIGS. 3 and 4, the second embodiment differs from the first embodiment in the shape of the bead B. That is, the second embodiment, since a portion of the bead B contained in the non-molded article sites W 2 is bent at a right angle, increase the rigidly fixed to wrinkle suppressing effect non moldings site W 2 during the draw-forming be able to. On the other hand, since the remainder of the bead B in the articles site W 1 is bent loose, it is easy flat extended machining a bead B in the restrike step.
[0016]
Although the embodiments of the present invention have been described in detail above, various design changes can be made in the present invention without departing from the gist thereof.
[0017]
For example, is provided with the Ritoraiku process between the trim step and bend step in the embodiment, to abolish the Ritoraiku step, the extended portion of the bead B in the articles site W 1 in the bend step directly at the same time It is also possible to form the bent flange F by bending, so that the number of steps can be reduced.
[0018]
【The invention's effect】
As described above, according to the first and second aspects of the present invention, a bead is formed so as to straddle a molded part and a non-molded part of a blank in a draw step, and a part of the bead is formed in a subsequent trim step. Cut and remove the non-molded article part while leaving it on the molded article part side, then extend the remaining part of the bead left on the molded article part side in the trimming step, and bend the periphery of the molded article part including the remaining part Since the bent flange is formed, a part of the bead (the remaining part) formed to control the slip of the peripheral portion of the blank can be used as a part of a molded product, and the yield of the material is improved. . In addition, even if a slight flaw is formed at the periphery of the molded product part during bead molding, a bent flange is formed there, so that the flaw can be made inconspicuous.
[0019]
According to the first aspect of the present invention, since the remaining portion of the bead is extended flat and the bent flange is formed at the same time in the bend process, the number of processes can be minimized and the processing cost can be reduced.
[0020]
According to the second aspect of the present invention, a restriking step is provided between the trimming step and the bending step to extend the remaining portion of the bead flat, so that the bead is not affected by the remaining portion. The bending process can be easily performed, and the finish of the bent flange can be improved.
[0021]
According to the third aspect of the present invention, since the bend angle of the bead left on the molded article side in the trimming step is less than 90 °, it is easy to flatten the bead in the restriking step.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a draw mold. FIG. 2 is an operation explanatory view corresponding to FIG. 1. FIG. 3 is an explanatory view of each process. FIG. 4 is a view corresponding to FIG. 3 according to a second embodiment. [Explanation of symbols]
1 Lower mold 2 Upper mold
7 1 bead groove
8 1 Bead projection B Bead F Bend flange S Blank W 1 Molded part W 2 Non-molded part
Claims (3)
前記絞り成形の際には、前記ビード（Ｂ）が、成形品部位（Ｗ1 ）及び該成形品部位（Ｗ1 ）の周縁の非成形品部位（Ｗ2 ）に跨がるように成形されるドロー工程と、
前記ビード（Ｂ）の一部を成形品部位（Ｗ1 ）側に残して該成形品部位（Ｗ1 ）から非成形品部位（Ｗ2 ）を切断除去するトリム工程と、
そのトリム工程で成形品部位（Ｗ 1 ）側に残されたビード（Ｂ）の残り部分を平坦に延ばすと同時に、該残り部分を含む成形品部位（Ｗ1 ）の周縁を折り曲げて折曲フランジ（Ｆ）を成形するベンド工程とを備えたことを特徴とする、折曲フランジを有する絞り成形品の成形方法。When the blank (S) is pressed with the lower mold (1) and the upper mold (2) to perform drawing, the bead grooves (7 1 ) and the bead protrusions (8 1 ) of the molds (1, 2) are used. In a method for forming a drawn molded article having a bent flange, by clamping the blank (S) to suppress slippage of the periphery of the blank (S) during drawing,
During the drawing, the bead (B) is molded so as to extend over the non-molded article sites of the periphery of the molded article sites (W 1) and the molded article sites (W 1) (W 2) Draw process,
And trim step of cutting and removing the non-molded product site (W 2) from the molded article sites (W 1) a portion of said bead (B) to leave the molded article portions (W 1) side,
In the trimming step, the remaining portion of the bead (B) left on the side of the molded article portion (W 1 ) is extended flat, and at the same time, the periphery of the molded article portion (W 1 ) including the remaining portion is bent to form a bent flange. And (b) forming a drawn product having a bent flange.
前記絞り成形の際には、前記ビード（Ｂ）が、成形品部位（Ｗ 1 ）及び該成形品部位（Ｗ 1 ）の周縁の非成形品部位（Ｗ 2 ）に跨がるように成形されるドロー工程と、
前記ビード（Ｂ）の一部を成形品部位（Ｗ 1 ）側に残して該成形品部位（Ｗ 1 ）から非成形品部位（Ｗ 2 ）を切断除去するトリム工程と、
そのトリム工程で成形品部位（Ｗ 1 ）側に残されたビード（Ｂ）の残り部分を平坦に延ばすリストライク工程と、
前記ビード（Ｂ）の前記残り部分を含む成形品部位（Ｗ 1 ）の周縁を折り曲げて折曲フランジ（Ｆ）を成形するベンド工程とを備えたことを特徴とする、折曲フランジを有する絞り成形品の成形方法。 When the blank (S) is pressed with the lower mold (1) and the upper mold (2) to perform drawing, the bead grooves (7 1 ) and the bead protrusions (8 1 ) of the molds (1, 2) are used. In a method for forming a drawn molded article having a bent flange, by clamping the blank (S) to suppress slippage of the periphery of the blank (S) during drawing,
During the drawing, the bead (B) is molded so as to extend over the non-molded article sites of the periphery of the molded article sites (W 1) and the molded article sites (W 1) (W 2) Draw process,
And trim step of cutting and removing the non-molded product site (W 2) from the molded article sites (W 1) a portion of said bead (B) to leave the molded article portions (W 1) side,
A restriking step of flatly extending the remaining part of the bead (B) left on the molded article part (W 1 ) side in the trimming step ;
Characterized in that a bend shaping the bent flange (F) by folding the peripheral edge of the molded article sites (W 1) containing the remainder of the bead (B), the diaphragm having a bent flange Molding method of molded article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23170995A JP3547862B2 (en) | 1995-09-08 | 1995-09-08 | Forming method of draw-formed product having bent flange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23170995A JP3547862B2 (en) | 1995-09-08 | 1995-09-08 | Forming method of draw-formed product having bent flange |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0970626A JPH0970626A (en) | 1997-03-18 |
| JP3547862B2 true JP3547862B2 (en) | 2004-07-28 |
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ID=16927787
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23170995A Expired - Fee Related JP3547862B2 (en) | 1995-09-08 | 1995-09-08 | Forming method of draw-formed product having bent flange |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3547862B2 (en) |
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-
1995
- 1995-09-08 JP JP23170995A patent/JP3547862B2/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102615178A (en) * | 2012-04-01 | 2012-08-01 | 柳州五菱汽车有限责任公司 | Edge rolling technology for large-sized covering component |
| US12115571B2 (en) | 2019-01-11 | 2024-10-15 | Jfe Steel Corporation | Press-forming method, blank member for sheet-shaped material, intermediate formed product, method for manufacturing press-formed product, and press-formed product |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0970626A (en) | 1997-03-18 |
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