JP4681420B2 - Press molding method and press mold excellent in shape freezing property - Google Patents

Press molding method and press mold excellent in shape freezing property Download PDF

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JP4681420B2
JP4681420B2 JP2005304646A JP2005304646A JP4681420B2 JP 4681420 B2 JP4681420 B2 JP 4681420B2 JP 2005304646 A JP2005304646 A JP 2005304646A JP 2005304646 A JP2005304646 A JP 2005304646A JP 4681420 B2 JP4681420 B2 JP 4681420B2
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JP2007111725A (en
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栄志 磯貝
亨 吉田
浩二 橋本
高 有賀
俊二 樋渡
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新日本製鐵株式会社
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本発明は金属板のプレス成形方法及びプレス金型に関するものであって、特に高強度鋼板やアルミニウム合金板などの場合に生ずるスプリングバックを防止して良好な形状凍結性を確保するためのプレス成形方法及びプレス金型に関するものである。   TECHNICAL FIELD The present invention relates to a metal plate press forming method and a press die, and particularly press forming for preventing a spring back that occurs in the case of a high-strength steel plate or an aluminum alloy plate and ensuring good shape freezing property. The present invention relates to a method and a press die.
近年、自動車部品に高強度鋼板やアルミニウム合金板等の金属板が多用されつつあるが、それらを自動車部品に成形する際に発生する形状凍結不良が問題になっている。すなわち、ハット型断面形状の部品をU字型の曲げ加工用金型を用いて成形する場合には、スプリングバックと呼ばれる形状凍結不良が発生し、寸法精度が得られないことが問題となっている。この形状凍結不良は最終製品の外観品質を著しく損なうばかりでなく、成形後に行われる組立作業において溶接不良の原因となるため、特にメンバーやフレームなどの構造部品では形状凍結不良の防止が重要視されている。   In recent years, metal plates such as high-strength steel plates and aluminum alloy plates are often used for automobile parts, but shape freezing defects that occur when molding them into automobile parts have become a problem. That is, when a hat-shaped cross-sectional part is formed using a U-shaped bending mold, a shape freezing defect called a spring back occurs, and dimensional accuracy cannot be obtained. Yes. This shape freezing defect not only significantly deteriorates the appearance quality of the final product, but also causes welding failure in assembly operations performed after molding. Therefore, prevention of shape freezing failure is particularly important for structural parts such as members and frames. ing.
ここで、先ず、ハット型成形部品の加工に用いられるプレス成形装置の概略について簡単に述べておくと、プレス成形装置は、例えば図1に示すように、断面凹部状に形成されたダイス5と、このダイス5の凹部と対応する形状に形成されると共に、当該凹部内に向かって伸長可能に構成されたポンチ3とを備えている。さらに、プレス成形装置には、製品にしわが発生しないようにするために、ダイス5の周縁部と対応する位置にて鋼板を狭圧して、しわ押さえ力を負荷するしわ押さえ4が設けられている。このような構成において、被加工材である金属板のブランク(未加工材)6をダイス5に載置し、しわ押さえ4でしわ押さえ力を負荷しながら、ポンチ3を成形下死点Aまで伸長させることにより、金属板が所望の凹部状に成形されて最終製品Sとしてのハット成形部品を得る。   Here, first, an outline of a press molding apparatus used for processing a hat-shaped molded part will be briefly described. As shown in FIG. 1, for example, the press molding apparatus includes a die 5 formed in a concave shape in cross section. The punch 5 is formed in a shape corresponding to the concave portion of the die 5 and is configured to be extendable into the concave portion. Further, the press forming apparatus is provided with a wrinkle presser 4 that applies a wrinkle pressing force by narrowing the steel plate at a position corresponding to the peripheral portion of the die 5 so as not to cause wrinkles in the product. . In such a configuration, a blank (unprocessed material) 6 of a metal plate, which is a workpiece, is placed on a die 5, and the punch 3 is formed to the bottom dead center A while applying a wrinkle holding force with the wrinkle presser 4. By extending, the metal plate is formed into a desired concave shape, and a hat-formed part as the final product S is obtained.
従来のプレス成形方法は、前記したようにポンチ3としわ押さえ4及びダイス5を用い、成形下死点Aにおいて製品寸法になるようにプレス成形し(図1(a)→(b))、成形下死点Aに到達後(図1(b))、しわ押さえ4とポンチ3を同時に離型していた(図1(c))。そのため、曲げ−曲げ戻し変形をうける製品の壁部は、材料の弾性回復によって壁反りを生じるという問題があった。   As described above, the conventional press molding method uses the punch 3 and the wrinkle retainer 4 and the die 5 and press-molds so as to have the product size at the bottom dead center A (FIG. 1 (a) → (b)) After reaching the bottom dead center A (FIG. 1 (b)), the wrinkle retainer 4 and the punch 3 were simultaneously released (FIG. 1 (c)). For this reason, there has been a problem that the wall portion of the product that is subjected to bending-bending deformation undergoes wall warpage due to elastic recovery of the material.
曲げ加工で頻繁に観察される形状不良として知られているスプリングバックは、曲げ加工時に金型板に生じた残留応力が除荷時に弾性回復変形するために生ずる現象で、成形下死点での残留応力が板厚方向に不均一に分布することが原因である。一般に、プレス加工により曲げ成形した際に、型から開放すると金属板のスプリングバックにより、ポンチの肩部に開きを生じる。この問題を解決するため、特許文献1には、曲げ肩部に成形方向とは逆方向に凹む凹状段部を同時に成形するプレス成形方法及び成形品が開示されている。これはスプリングバックに対抗する逆モーメントを発生させて両者を釣り合わせて、ポンチ肩付近の角度の開きを防止するものである。   Springback, which is known as a shape defect frequently observed in bending, is a phenomenon that occurs because the residual stress generated in the mold plate during bending is elastically restored and deformed during unloading. This is because the residual stress is unevenly distributed in the thickness direction. In general, when bent from the mold, the shoulder of the punch is opened by the spring back of the metal plate when it is released from the mold. In order to solve this problem, Patent Document 1 discloses a press molding method and a molded product for simultaneously molding a concave step portion recessed in a direction opposite to the molding direction on a bending shoulder. This creates a reverse moment against the springback and balances them to prevent the opening of the angle near the punch shoulder.
しかし、図2に示すように、最終製品Sとしてのハット型成形部品におけるスプリングバックは肩部1の角度変化だけではなく、例えば高強度鋼板やアルミニウム合金板のように材料強度が高くなると、壁部2が平面から曲率を持つ曲面に変形する「壁反り」といわれる現象も顕在化し、特許文献1に開示された手法では壁部の反りを充分に防止することはできない。なお、図中の破線は、成形下死点での金属板の形状を示している。   However, as shown in FIG. 2, the spring back in the hat-shaped molded part as the final product S is not only the change in the angle of the shoulder 1, but the wall A phenomenon called “wall warpage” in which the portion 2 is deformed from a flat surface to a curved surface having curvature is also manifested, and the method disclosed in Patent Document 1 cannot sufficiently prevent the warpage of the wall portion. In addition, the broken line in a figure has shown the shape of the metal plate in a shaping | molding bottom dead center.
また、特許文献2には図3に示すように、2種類のパンチを用いて予備加工及び本加工を行うことで、壁部の反りを低減できることが開示されている。これは1回目のプレス成形に球頭工具7を用いることで(同図(a)、(b))、製品のポンチ底周長を2回目のポンチ底部の周長より大きく設定できるので(同図(c)、(d))、2回目のプレス成形で受ける曲げ曲げ戻し変形量(曲げモーメント)を従来法より少なくすることができる。また、1回目のプレス成形に球頭工具7を用いることで、2回目のプレス成形でパンチ底のたるみをつぶせるので、パンチ肩部の開き角度を低減することができる。   Further, as shown in FIG. 3, Patent Document 2 discloses that the warpage of the wall portion can be reduced by performing preliminary processing and main processing using two types of punches. This is because the punch bottom circumference of the product can be set larger than the circumference of the second punch bottom by using the ball head tool 7 for the first press molding (FIGS. (A) and (b)). Figures (c) and (d)) The amount of bending and bending deformation (bending moment) received in the second press molding can be reduced as compared with the conventional method. In addition, by using the ball head tool 7 for the first press molding, the slack of the punch bottom can be crushed by the second press molding, so that the opening angle of the punch shoulder can be reduced.
これにより、パンチ肩部の開きとパンチ肩付近の壁部の反りを低減できるが、この手法の場合、しわ押さえ4に近い側の縦壁部5には曲げ曲げ戻し変形が残るので、縦壁全体の反りをゼロにすることは困難である(同図(e)〜(g))。   Thereby, the opening of the punch shoulder and the warp of the wall near the punch shoulder can be reduced. However, in this method, the vertical wall 5 close to the wrinkle retainer 4 remains bent and bent back, so the vertical wall It is difficult to make the total warpage zero (FIGS. (E) to (g)).
特開平7−185663号公報JP 7-185663 A 特開2004−181502号公報JP 2004-181502 A
本発明は、このような事情に基づいてなされたものであり、プレス成形部品の壁部全体の反りを防止して形状凍結性に優れたプレス成形方法及びプレス金型を提供することを目的とする。   The present invention was made based on such circumstances, and an object of the present invention is to provide a press molding method and a press die excellent in shape freezing property by preventing warpage of the entire wall portion of a press molded part. To do.
係る課題を解決するため、本発明の要旨とするところは下記の通りである。
(1) 1回目のプレス成形において、しわ押さえ力を負荷しながらダイス及び最終製品形状の底部の中央部と形状の等しい平面を有し、かつ、ダイス幅よりも7mm以上小さい幅のポンチを用いて所定の幅及び深さになるように金属板をプレス成形した後、2回目以降の同方向のプレス成形において、前記1回目のプレス成形と同じダイスを用い、かつ、前記ポンチ幅より5mm以上広いポンチを用いて、しわ押さえ力を負荷しながら少なくとも1回プレス成形することを特徴とする形状凍結性に優れた、ハット型成形部品のプレス成形方法。
(2) 1回目のプレス成形において、ダイス及び最終製品形状の底部の中央部と形状の等しい平面を有し、かつ、ダイス幅よりも7mm以上小さい幅のポンチを用いて所定の幅及び深さになるように非拘束状態の金属板をプレス成形した後、2回目以降の同方向のプレス成形において、前記1回目のプレス成形と同じダイスを用い、かつ、前記ポンチ幅より5mm以上広いポンチを用いて、しわ押さえ力を負荷しながら少なくとも1回プレス成形することを特徴とする形状凍結性に優れた、ハット型成形部品のプレス成形方法。
(3) 2回目以降の最後のプレス成形において、ポンチ及びダイスで被加工材のポンチ底部を押さえながらプレス成形することを特徴とする前記(1)又は(2)記載の形状凍結性に優れた、ハット型成形部品のプレス成形方法。
(4)前記(1)〜(3)のいずれかに記載のハット型成形部品のプレス成形方法用のプレス金型であって、ポンチが内側と外側に分割され、内側のポンチのみが成形下死点に到達した後、内側のポンチが上昇することなく、外側のポンチが前記成形下死点まで移動自在であることを特徴とする形状凍結性に優れた、ハット型成形部品のプレス金型。
In order to solve the problem, the gist of the present invention is as follows.
(1) In the first press molding, it has a central portion and equal plan shape of the bottom of the die and the final product shape while loading the blank holding force, and, using a punch of smaller width than 7mm than the die width After press forming the metal plate so as to have a predetermined width and depth, in the second and subsequent press forming in the same direction, the same die as the first press forming is used, and 5 mm or more from the punch width A method for press-molding a hat-shaped molded part having excellent shape freezing property, characterized in that a wide punch is used and press-molding is performed at least once while a wrinkle holding force is applied.
(2) In the first press molding, dies and the final product shape bottom have a central portion and equal plan shape of, and predetermined width and depth using a punch of smaller width than 7mm than the die width After pressing the unconstrained metal plate so as to be, in the second and subsequent press forming in the same direction, use the same die as the first press forming, and a punch wider than the punch width by 5 mm or more A press-molding method for a hat-shaped molded part, which is excellent in shape freezing property, characterized in that it is press-molded at least once while applying a wrinkle pressing force.
(3) In the last press molding after the second time, press molding is performed while pressing the bottom of the punch of the workpiece with a punch and a die, and the shape freezing property according to (1) or (2) is excellent. , Press molding method for hat-shaped molded parts.
(4) A press mold for the press-molding method for a hat-shaped molded part according to any one of (1) to (3), wherein the punch is divided into an inner side and an outer side, and only the inner punch is under molding. After reaching the dead point, the inner punch does not rise, and the outer punch can move to the molding bottom dead center. .
本発明によれば、プレス成形部品の壁部全体の反りを防止することができ、寸法精度に優れる形状凍結性の良好なハット型成形部品を得ることができる。
つまり、本発明では、1回目のプレス成形において、ダイス及び最終製品形状の底部の一部と形状の等しい平面を有するポンチを用いることで、1回目のプレス成形で得られた製品の壁部全体に2回目のプレス成形で充分な逆曲げ変形が付与できるので、壁部全体の反りをほぼゼロにすることができる。
ADVANTAGE OF THE INVENTION According to this invention, the curvature of the whole wall part of a press-molded part can be prevented, and the hat-shaped molded part with the favorable shape freezing property which is excellent in dimensional accuracy can be obtained.
In other words, in the present invention, in the first press molding, the entire wall portion of the product obtained by the first press molding is used by using a die and a punch having a plane having the same shape as a part of the bottom of the final product shape. In addition, since sufficient reverse bending deformation can be imparted by the second press molding, warpage of the entire wall portion can be made substantially zero.
以下、本発明の実施の形態について添付図面を参照しながら詳細に説明する。
本発明者らはコの字型断面形状を有するハット型成形部品の壁部の反りを防止するためのプレス成形方法とプレス成形金型について検討し、以下に詳しく説明するプレス成形方法とプレス金型を採用することにより金属板のスプリングバックを防止できることを知見した。
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The present inventors have examined a press molding method and a press mold for preventing warpage of a wall portion of a hat-shaped molded part having a U-shaped cross-sectional shape, and the press molding method and the press mold described in detail below. It was found that the spring back of the metal plate can be prevented by adopting the mold.
本発明者らは、2回以上のプレス成形で所定の製品寸法となるようにプレス金型を設計し、2回目以降の最後のプレス成形において、1回目のポンチ幅W1よりポンチ幅Wを広げることで金属板のスプリングバックを低減できることを知見した。また、最後のプレス成形の成形下死点Aにおいて、ポンチ及びダイスで被加工材を押さえながらプレス成形することで、この効果がさらに向上することも知見した。   The inventors of the present invention design a press die so that a predetermined product size is obtained by two or more press moldings, and the punch width W is wider than the first punch width W1 in the second and subsequent press moldings. It was found that the spring back of the metal plate can be reduced. In addition, it has also been found that this effect is further improved by press molding while pressing the workpiece with a punch and a die at the bottom dead center A of the final press molding.
前記(1)に係る発明は、1回目のプレス成形において、しわ押さえ力を負荷しながらダイス及び最終製品形状の底部の一部と形状の等しい平面を有するポンチを用いて所定の幅及び深さになるように金属板をプレス成形した後、2回目以降のプレス成形において、前記幅より広くなるように、しわ押さえ力を負荷しながら少なくとも1回プレス成形することを特徴とする。その好ましい実施形態としては、例えば図4に示すように、1回目のプレスに用いるポンチ幅Wの第1のポンチ7(同図(a))及び、2回目のプレスに用いるポンチ幅W2の第2のポンチ(フォーム用)8(同図(c))を別個に備えた構成とし、2回目のポンチ幅W(=W2)が1回目のポンチ幅Wよりも大きくなるように設定する。即ち、第1のポンチ7は、最終製品形状の底部の一部と形状の等しい平面を有するポンチであり、本例においては最終製品の底部形状が平面であるので、その底部が平面に形成されたポンチを用いている。 In the invention according to (1), in the first press molding, a predetermined width and depth are obtained by using a die having a plane that is equal in shape to a part of the bottom of the die and the final product shape while applying a wrinkle holding force. In the second and subsequent press molding, the metal plate is press molded at least once while applying a crease pressing force so as to be wider than the width. As a preferred embodiment thereof, for example, as shown in FIG. 4, a first punch 7 having the punch width W 1 used in the first press (FIG. 4A) and a punch width W 2 used in the second press. The second punch (for foam) 8 (FIG. 3C) is separately provided so that the second punch width W (= W 2 ) is larger than the first punch width W 1. Set. That is, the first punch 7 is a punch having a flat surface having the same shape as a part of the bottom of the final product shape. In this example, the bottom shape of the final product is a flat surface. A punch is used.
そして、しわ押さえ4によりしわ押さえ力を負荷しながら第1のポンチ7を用いて幅W及び深さDになるように1回目のプレス成形を行った後(図4(a)→(b))、しわ押さえ力を負荷しながら第2のポンチを用いて幅W2(>W)及び深さDになる2回目のプレス成形で最終製品Sが得られるようにする(図4((c)→(f))。これにより金属板のスプリングバックを低減できるのは、図4(d)に示すように、壁部の内側に金属板を曲げようとする逆曲げ変形を製品の壁部に付与できるためである。 Then, after the first press forming is performed by using the first punch 7 while applying the wrinkle pressing force by the wrinkle presser 4 so as to have the width W 1 and the depth D 1 (FIG. 4A → ( b)) The final product S is obtained by the second press molding with the width W 2 (> W 1 ) and the depth D 1 using the second punch while applying the wrinkle pressing force (see FIG. 4 ((c) → (f)) This can reduce the spring back of the metal plate, as shown in FIG. 4 (d), by reverse bending deformation to bend the metal plate inside the wall portion. This is because it can be applied to the wall of the product.
前記(2)に係る発明は、1回目のプレス成形において、しわ押さえ力を負荷しないでダイス1及び最終製品形状の底部の一部と形状の等しい平面を有するポンチを用いて所定の幅及び深さになるように、非拘束状態の金属板をプレス成形した後、2回目以降のプレス成形において、前記幅より広くなるように、しわ押さえ力を負荷しながら少なくとも1回プレス成形することを特徴とする。その好ましい実施形態としては、例えば図に示すように、しわ押さえ力を負荷しない状態で第1のポンチ7を用いて幅W1及び深さD1になるように1回目のプレス成形を行った後(図(a)→(b))、しわ押さえ4によりしわ押さえ力を負荷しながら第2のポンチ8を用いて幅W2(>W)及び深さD1になる2回目のプレス成形で最終製品Sが得られるようにする(図((c)→(f))。これにより金属板のスプリングバックを低減できるのは、1回目のプレス成形でしわ押さえ力を負荷しないで(非拘束状態で)プレス成形された製品は、ポンチ肩とダイ肩による曲げ変形のみなので、しわ押さえ力を付与した場合(図4(b))のようなダイ肩R部による曲げ曲げ戻し変形が付与されないため、製品の壁部に生じるひずみと応力を大幅に低減できるためである。 In the invention according to (2) above, in the first press molding, a predetermined width and depth are obtained by using a die 1 and a punch having a shape equal to a part of the bottom of the final product shape without applying a wrinkle holding force. Then, after the non-restrained metal plate is press-molded, it is press-molded at least once while applying a wrinkle pressing force so as to be wider than the width in the second and subsequent press molding. And As a preferred embodiment, for example, as shown in FIG. 5 , the first press molding is performed using the first punch 7 so as to have the width W 1 and the depth D 1 without applying a wrinkle holding force. After that (FIG. 5 (a) → (b)), the second punch 8 is used for the width W 2 (> W 1 ) and the depth D 1 while the wrinkle pressing force is applied by the wrinkle presser 4. (Fig. 5 ((c)-> (f)) The spring back of the metal plate can be reduced by applying the wrinkle holding force in the first press molding. The product that is not pressed (in the unconstrained state) is only bent and deformed by the punch shoulder and the die shoulder, so that bending bending by the die shoulder R portion as shown in FIG. 4 (b) is applied. No distortion is applied to the product wall, This is because the stress and stress can be greatly reduced.
前記(3)に係る発明は、2回目以降の最後のプレス成形において、ポンチ及びダイスで被加工材のポンチ底部を押さえながらプレス成形することを特徴とする。
2回目以降の最後のプレス成形において、被加工材のポンチ底を押さえないでプレス成形を行うと、例えば図に示すように、製品のポンチ底にたるみが発生する場合があるので、製品の壁部に逆曲げ変形を十分に付与することができず、壁反りを十分に抑制できない。本発明の目的とする作用は、壁部に逆曲げ成形を付与することであるので、確実に壁反りを防止するためには、被加工材のポンチ底を押さえることが好ましい。
The invention according to (3) is characterized in that in the final press molding after the second time, press molding is performed while pressing the punch bottom of the workpiece with a punch and a die.
In the final press molding after the second time, if the press molding is performed without pressing the punch bottom of the workpiece, for example, as shown in FIG. 6 , sagging may occur on the punch bottom of the product. A reverse bending deformation cannot be sufficiently applied to the wall portion, and the wall warp cannot be sufficiently suppressed. Since the intended function of the present invention is to impart reverse bending to the wall, it is preferable to hold down the punch bottom of the workpiece in order to reliably prevent wall warpage.
前記(4)に係る発明は、ポンチが内側と外側に分割され、内側のポンチのみが成形下死点に到達した後、内側のポンチが上昇することなく、外側のポンチが前記成形下死点まで移動自在であることを特徴とする。その好ましい実施形態としては、例えば図に示すように、1回目のプレスに用いるポンチ幅Wの第1のポンチ10aを内筒とし、この第1のポンチ10aの周縁部を囲むポンチ幅W2のリング状の第2のポンチ10bを外筒とする分割ポンチ10を備えた構成とする。第1ポンチ10a及び第2のポンチ10bは、各々が独立して伸長可能なように構成されている。この場合にも、上述の例と同様に、内側のポンチである第1のポンチ10aは、最終製品形状の底部の一部と形状の等しい平面を有している。 In the invention according to (4), the punch is divided into an inner side and an outer side, and after only the inner punch reaches the molding bottom dead center, the inner punch does not rise, and the outer punch rises to the molding bottom dead center. It is possible to move up to. As the preferred embodiment, for example, as shown in FIG. 7, the inner cylinder of the first punch 10a of the punch width W 1 used for the first press, punch width W that surrounds the periphery of the first punch 10a It is set as the structure provided with the division | segmentation punch 10 which uses the 2nd ring-shaped 2nd punch 10b as an outer cylinder. The first punch 10a and the second punch 10b are configured so that each can be extended independently. Also in this case, as in the above-described example, the first punch 10a that is the inner punch has a plane that has the same shape as a part of the bottom of the final product shape.
そして、先ず、第1のポンチ10aにより幅W1及び深さDになるように1回目のプレス成形を行った後(図(a)→(b))、第1のポンチ10aが成形下死点Aに残した状態で第2のポンチ10bを用いて幅W2(>W1)及び深さDになる2回目のプレス成形で最終製品Sが得られるようにする(図(c)→(f))。なお、しわ押さえ力は、上述の場合と同様に1回目及び2回目の両方に負荷してもよく、あるいは1回目には負荷しないようにしてもよい。 Then, first, after the first press-molded into a width W1 and a depth D 1 by a first punch 10a (FIG. 7 (a) → (b) ), the first punch 10a is under molding The final product S is obtained by the second press molding with the width W 2 (> W 1 ) and the depth D 1 using the second punch 10b in the state left at the dead point A (FIG. 7 ( c) → (f)). The wrinkle pressing force may be applied to both the first time and the second time as in the case described above, or may not be applied to the first time.
上記(1)〜(3)に記載のプレス成形方法は、1回目と2回目のプレス金型がそれぞれ独立にあっても良いが、図7に示す金型構造を採用すると、2回のプレス成形を1回に集約して連続して成形することができるという利点がある。また、1回目のプレス成形後に被加工材のポンチ底部を押さえながらプレス成形することができるので、この場合には上記(3)に記載の効果も期待できるので好ましい。   In the press molding methods described in the above (1) to (3), the first and second press dies may be independent of each other, but when the die structure shown in FIG. There is an advantage that the molding can be performed continuously in one time. Moreover, since it can press-mold while pressing the punch bottom part of a workpiece after the first press-molding, in this case, the effect described in the above (3) can be expected, which is preferable.
なお、上記説明では2回目のプレスで最終製品が得られる例を説明したが、本発明においては、プレスの回数は2回に限られず、複数回のプレスを行って最終製品を得るように設計した場合にも上記の効果は期待できる。   In the above description, the example in which the final product is obtained by the second press has been described. However, in the present invention, the number of presses is not limited to two, and the final product is obtained by performing a plurality of presses. In this case, the above effect can be expected.
続いて本発明の効果を確認するために行った実施例について以下に説明する。   Next, examples performed for confirming the effects of the present invention will be described below.
(実施例1)
本発明例として、板厚1.0mmで、引張り強さ590MPa級の鋼板を用いてプレス試験を行った。試験片幅は幅100mm、長さ280mmとして、ポンチ幅80mm、ポンチ肩R5mm、ダイス幅82mm、ダイ肩R5mm、成形高さを80mmとしてハット成形試験を行った。本発明の効果について検討するため、2回目のプレス成形で所定寸法形状になるように設計した。1回目のポンチ幅75mm、ポンチ肩R5mm、成形深さを70mm又は80mmとし、さらに2回目のポンチ幅80mm、ポンチ肩R5mm、成形高さを80mmとしてハット成形試験を行い、この効果について検討した。1回目と2回目のしわ押さえ力は100kNとした。このとき、1回目のしわ押さえ力は負荷しない条件でもプレス成形を行った(条件3)。また、比較例として、発明例と同じ鋼板を1回のプレスにて成形する試験を行った。
Example 1
As an example of the present invention, a press test was performed using a steel plate having a plate thickness of 1.0 mm and a tensile strength of 590 MPa. The hat width was 100 mm, the length was 280 mm, the punch width was 80 mm, the punch shoulder was 5 mm, the die width was 82 mm, the die shoulder was 5 mm, and the molding height was 80 mm. In order to examine the effect of the present invention, the second press molding was designed to have a predetermined size and shape. A hat forming test was conducted with a first punch width of 75 mm, a punch shoulder R of 5 mm, a forming depth of 70 mm or 80 mm, and a second punch width of 80 mm, a punch shoulder R of 5 mm, and a forming height of 80 mm. The first and second crease pressing force was 100 kN. At this time, press molding was performed even under the condition that the first wrinkle pressing force was not applied (condition 3). Moreover, the test which shape | molds the same steel plate as an invention example with one press as a comparative example was done.
曲げ試験を行った成形品は三次元形状測定装置にてハット型の中央断面の形状を測定し、壁部の反り曲率半径ρ(mm)及び開き幅Wd(mm)を測定した。これらの測定値から壁部の反り1/ρ(1/mm)と、以下の式により開き幅ΔWd(mm)の評価値を求めた。
ΔWd=Wd−80
The molded product subjected to the bending test was measured for the shape of the central section of the hat type with a three-dimensional shape measuring device, and the curvature radius ρ (mm) and the opening width W d (mm) of the wall portion were measured. From these measured values, an evaluation value of the wall warp 1 / ρ (1 / mm) and the opening width ΔW d (mm) was obtained by the following equation.
ΔW d = W d -80
(実施例2)
実施例2として、上記実施例1と同一の鋼種、試験片サイズ、プレス金型を用いて成形試験を行った。本発明の効果について検討するため、1回目と2回目のプレス金型がそれぞれ独立して別個に存在するもの(条件2)と、図8に示すような分割ポンチを採用したもの(条件3)でハット成形試験を行い、金型形状の影響について検討した。またこの例においても、比較例として、発明例と同じ鋼板を1回のプレスにて成形する試験を行った。
(Example 2)
As Example 2, a molding test was performed using the same steel type, test piece size, and press mold as in Example 1. In order to examine the effect of the present invention, the first and second press dies exist independently and separately (Condition 2), and a split punch as shown in FIG. 8 is adopted (Condition 3). A hat forming test was conducted to examine the influence of the mold shape. Also in this example, as a comparative example, a test was performed in which the same steel plate as that of the invention example was formed by a single press.
上記実施例1〜2の測定結果を表1〜2に示す。表中における壁部の反りに対する効果については、外反りのものにプラス、内反りのものにマイナスとして評価した。これらの結果から分かるように、本発明によれば、従来の手法に相当する比較例よりも寸法精度が向上した形状凍結性の良好なハット型成形部品を得ることができることが確認された。また被加工材のポンチ底を押さえて2回目以降のプレス成形を行うことで更に良好な寸法精度に優れるハット型成形部品を得ることができた。
The measurement result of the said Examples 1-2 is shown to Tables 1-2. In the table, the effect on the warp of the wall was evaluated as positive for the outward warp and negative for the internal warp. As can be seen from these results, according to the present invention, it was confirmed that a hat-shaped molded part with improved shape freezing property with improved dimensional accuracy compared to the comparative example corresponding to the conventional method can be obtained. Further, by performing the second and subsequent press molding while pressing the punch bottom of the workpiece, it was possible to obtain a hat-shaped molded part with even better dimensional accuracy.
従来のプレス加工方法の概念図である。 (a)成形前、(b)成形下死点、(c)ポンチ、しわ押さえ離型、(d)スプリングバック後の製品形状It is a conceptual diagram of the conventional press work method. (A) Before molding, (b) Molded bottom dead center, (c) Punch, wrinkle holding mold, (d) Product shape after springback 角度変化、壁反り、開き幅を測定する試験片の断面図を示す。Sectional drawing of the test piece which measures an angle change, wall curvature, and opening width is shown. 特許文献2のプレス加工方法の概念図である。 (a)成形前、(b)成形下死点、(c)ポンチ、しわ押さえ離型、(d)スプリングバック後の製品形状It is a conceptual diagram of the press work method of patent document 2. FIG. (A) Before molding, (b) Molded bottom dead center, (c) Punch, wrinkle holding mold, (d) Product shape after springback 本発明のプレス加工方法の概念図である。 (a)1回目の成形前、(b)1回目の成形下死点、(c)2回目の成形前、(d)2回目の成形中、(e)2回目の成形下死点、(f)ポンチ、しわ押さえ離型、(g)スプリングバック後の製品形状It is a conceptual diagram of the press work method of this invention. (A) Before the first molding, (b) First molding bottom dead center, (c) Before the second molding, (d) During the second molding, (e) Second molding bottom dead center, ( f) Punch, wrinkle release mold, (g) Product shape after springback 本発明のプレス加工方法の概念図である。 (a)1回目の成形前、(b)1回目の成形下死点、(c)2回目の成形前、(d)2回目の成形中、(e)2回目の成形下死点、(f)ポンチ、しわ押さえ離型、(g)スプリングバック後の製品形状It is a conceptual diagram of the press work method of this invention. (A) Before the first molding, (b) First molding bottom dead center, (c) Before the second molding, (d) During the second molding, (e) Second molding bottom dead center, ( f) Punch, wrinkle release mold, (g) Product shape after springback 被加工材のポンチ底面を押さえない場合のプレス加工方法の概念図である。 (a)2回目の成形前、(b)2回目の成形中It is a conceptual diagram of the press work method when not pressing down the punch bottom face of a workpiece. (A) Before the second molding, (b) During the second molding 本発明のプレス成形金型の概念図である。 (a)1回目の成形前、(b)1回目の成形下死点、(c)2回目の成形中、(d)2回目の成形下死点It is a conceptual diagram of the press molding die of this invention. (A) Before the first molding, (b) First molding bottom dead center, (c) During the second molding, (d) Second molding bottom dead center
1 肩部
2 壁部
3 ポンチ
4 しわ押さえ
5 ダイ
6 ブランク
7 第1のポンチ
8 第2のポンチ(フォーム用)
9 被加工材
10 分割ポンチ
11 1回目のプレス成形で成形された製品
開き幅
A 成形下死点
1回目の成形下死点
D 成形深さ
1回目の成形深さ
W ポンチ幅
1回目のポンチ幅
2回目のポンチ幅
1 shoulder
2 walls
3 punch 4 wrinkle retainer 5 die 6 blank
7 First punch
8 Second punch (for foam)
9 Work material
10 divided punch 11 first width A molded under open product W d molded by press molding dead point A 1 first molding bottom dead center D molded depth D 1 first forming height W punch width W 1 1 Second punch width W 2 Second punch width

Claims (4)

  1. 1回目のプレス成形において、しわ押さえ力を負荷しながらダイス及び最終製品形状の底部の中央部と形状の等しい平面を有し、かつ、ダイス幅よりも7mm以上小さい幅のポンチを用いて所定の幅及び深さになるように金属板をプレス成形した後、2回目以降の同方向のプレス成形において、前記1回目のプレス成形と同じダイスを用い、かつ、前記ポンチ幅より5mm以上広いポンチを用いて、しわ押さえ力を負荷しながら少なくとも1回プレス成形することを特徴とする形状凍結性に優れた、ハット型成形部品のプレス成形方法。 In the first press molding, wrinkles of the pressing force die and the final product shape while loading the bottom have a central portion and equal plan shape of, and the predetermined using punch of smaller width than 7mm than the die width After the metal plate is press-formed so as to have a width and depth, in the second and subsequent press forming in the same direction, the same die as the first press forming is used, and a punch wider than the punch width by 5 mm or more is used. A press-molding method for a hat-shaped molded part, which is excellent in shape freezing property, characterized in that it is press-molded at least once while applying a wrinkle pressing force.
  2. 1回目のプレス成形において、ダイス及び最終製品形状の底部の中央部と形状の等しい平面を有し、かつ、ダイス幅よりも7mm以上小さい幅のポンチを用いて所定の幅及び深さになるように非拘束状態の金属板をプレス成形した後、2回目以降の同方向のプレス成形において、前記1回目のプレス成形と同じダイスを用い、かつ、前記ポンチ幅より5mm以上広いポンチを用いて、しわ押さえ力を負荷しながら少なくとも1回プレス成形することを特徴とする形状凍結性に優れた、ハット型成形部品のプレス成形方法。 In the first press molding, have a same plane of the central portion and the shape of the bottom portion of the die and the final product shape, and so that a predetermined width and depth using a punch of smaller width than 7mm than the die width In the press molding in the same direction after the second press after forming the metal plate in an unconstrained state, using the same die as the first press molding, and using a punch wider than the punch width by 5 mm or more, A press-molding method for a hat-shaped molded part having excellent shape freezing property, wherein the press-molding is performed at least once while applying a wrinkle holding force.
  3. 2回目以降の最後のプレス成形において、ポンチ及びダイスで被加工材のポンチ底部を押さえながらプレス成形することを特徴とする請求項1又は2記載の形状凍結性に優れた、ハット型成形部品のプレス成形方法。   3. The hat-shaped molded part having excellent shape freezing property according to claim 1, wherein in the final press molding after the second time, press molding is performed while pressing a punch bottom of a workpiece with a punch and a die. Press molding method.
  4. 請求項1〜3のいずれか1項に記載のハット型成形部品のプレス成形方法用のプレス金型であって、ポンチが内側と外側に分割され、内側のポンチのみが成形下死点に到達した後、内側のポンチが上昇することなく、外側のポンチが前記成形下死点まで移動自在であることを特徴とする形状凍結性に優れた、ハット型成形部品のプレス金型。   It is a press die for the press molding method of the hat-shaped molded part according to any one of claims 1 to 3, wherein the punch is divided into an inner side and an outer side, and only the inner punch reaches the bottom dead center of molding. After that, a press die for a hat-shaped molded part having excellent shape freezing property, wherein the outer punch can be moved to the molding bottom dead center without raising the inner punch.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180119672A (en) 2016-04-28 2018-11-02 제이에프이 스틸 가부시키가이샤 Press molding method

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9767234B2 (en) * 2006-08-31 2017-09-19 Nippon Steel & Sumitomo Metal Corporation Method of identification of cause and/or location of cause of occurrence of springback
JP5031703B2 (en) * 2008-09-12 2012-09-26 新日本製鐵株式会社 Multi-stage press forming method with excellent shape freezing
JP5077211B2 (en) * 2008-12-05 2012-11-21 トヨタ車体株式会社 Molded body having odd-shaped U-shaped portion and manufacturing method thereof
CN102905809B (en) 2010-05-25 2016-04-20 新日铁住金株式会社 The manufacturing process of the metal parts that shape freezing is excellent
US9211579B2 (en) 2010-11-24 2015-12-15 Nippon Steel & Sumitomo Metal Corporation Method of producing L-shaped product
KR101239477B1 (en) 2010-12-14 2013-03-06 주식회사 포스코 Metalic pattern of bending-type channel, manufacturing method of bending-type channel thereby
CN102248044B (en) * 2011-06-03 2014-03-12 中国重汽集团济南动力有限公司 Method for bending rear crossbeam of heavy truck and bending die
KR101821074B1 (en) 2013-10-09 2018-01-22 신닛테츠스미킨 카부시키카이샤 Production method for press-molded body, and press molding device
RU2628441C1 (en) * 2013-10-09 2017-08-17 Ниппон Стил Энд Сумитомо Метал Корпорейшн Method and device for compression moulding for shell-and-core element manufacturing of for vehicle body
MX2016017226A (en) 2014-06-26 2017-04-27 Nippon Steel & Sumitomo Metal Corp Method for manufacturing press-molded article, and press-molded article.
US10857583B2 (en) 2015-04-28 2020-12-08 Nippon Steel Corporation Press-working apparatus, press-working method, and press-molded product
KR101713773B1 (en) * 2015-12-29 2017-03-09 유진레이델 주식회사 manufacturing method of cooling fin for battery module
WO2018225832A1 (en) * 2017-06-07 2018-12-13 新日鐵住金株式会社 Press-molded article manufacturing method and press line

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000042635A (en) * 1998-07-29 2000-02-15 Sumitomo Metal Ind Ltd Method and device for press forming
JP2001071044A (en) * 1999-09-01 2001-03-21 Aiwa Co Ltd Working device and forming method
JP2002263744A (en) * 2001-03-06 2002-09-17 Toyota Motor Corp Metal stock drawing method, and press die for drawing
JP2004181502A (en) * 2002-12-05 2004-07-02 Jfe Steel Kk Press working method excellent in shape freezing property and working tool used for the same
JP2004358553A (en) * 2003-06-09 2004-12-24 Koshin Giken:Kk Method and device for forming thin cylindrical product with thick edge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01218722A (en) * 1988-02-29 1989-08-31 Sumitomo Light Metal Ind Ltd Manufacture of di can
JPH08206746A (en) * 1995-01-30 1996-08-13 Isuzu Motors Ltd Deep drawing device
JP3622469B2 (en) * 1998-01-28 2005-02-23 住友金属工業株式会社 Press molding method and press molding apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000042635A (en) * 1998-07-29 2000-02-15 Sumitomo Metal Ind Ltd Method and device for press forming
JP2001071044A (en) * 1999-09-01 2001-03-21 Aiwa Co Ltd Working device and forming method
JP2002263744A (en) * 2001-03-06 2002-09-17 Toyota Motor Corp Metal stock drawing method, and press die for drawing
JP2004181502A (en) * 2002-12-05 2004-07-02 Jfe Steel Kk Press working method excellent in shape freezing property and working tool used for the same
JP2004358553A (en) * 2003-06-09 2004-12-24 Koshin Giken:Kk Method and device for forming thin cylindrical product with thick edge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180119672A (en) 2016-04-28 2018-11-02 제이에프이 스틸 가부시키가이샤 Press molding method

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