JP2006289453A - Press forming method, and forming device - Google Patents

Press forming method, and forming device Download PDF

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JP2006289453A
JP2006289453A JP2005114972A JP2005114972A JP2006289453A JP 2006289453 A JP2006289453 A JP 2006289453A JP 2005114972 A JP2005114972 A JP 2005114972A JP 2005114972 A JP2005114972 A JP 2005114972A JP 2006289453 A JP2006289453 A JP 2006289453A
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steel plate
die
pushing
press
forming
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Toru Yoshida
亨 吉田
Koji Hashimoto
浩二 橋本
Eiji Isogai
栄志 磯貝
Atsushi Nitta
淳 新田
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Nippon Steel Corp
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Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot press forming method capable of forming a component having a high forming height without breaking the same and without increasing forming stages, and to provide a device therefor. <P>SOLUTION: In the hot press forming method where a heated steel plate is press-formed by a forming mold, while the edge faces of the steel plate are thrust to the flowing directions of the steel plate by a thrusting means, press forming is performed. Further, the hot press forming device at least comprises a die, a punch and a blank holder, and press-forms the heated steel plate by the forming mold, and is provided with the thrusting means of thrusting the edge faces of the steel plate to the flowing directions of the steel plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、鋼板のプレス成形方法およびその成形装置に関する。   The present invention relates to a steel sheet press forming method and a forming apparatus thereof.

従来、ドアパネルやドアビームなどのような自動車部品は、鋼板や鋼管をプレスや溶接によって成形、製作されてきたが、近年、さらに軽量化や製作の効率化を目的として、鋼管を上下の金型に挿入し、この鋼管に流体による高内圧力を作用させると共に、鋼管をその軸方向に押し込む圧縮力を作用させて成形するハイドロフォーミング法や、鋼板を約900℃以上に加熱した後、金型内に挿入し、成形と同時に金型内で焼き入れを行うダイクエンチ法などによる成型方法が開発されている。ハイドロフォーム法によれば、複数の部材を溶接して製作していた部材を一体成形により製作できるので、部品点数や溶接箇所を削減することができ、製造コストも低減できる。また、ダイクエンチ法によれば、1500MPa級の高強度の部品をプレスにより成形でき、スプリングバックが少なく、遅れ破壊の発生しにくい部品を少ないプレス力で得ることが出来る。   Conventionally, automotive parts such as door panels and door beams have been formed and manufactured by pressing and welding steel plates and steel pipes. In recent years, steel pipes are used as upper and lower molds for the purpose of further weight reduction and production efficiency. Inserting and applying a high internal pressure due to fluid to the steel pipe and applying a compressive force that pushes the steel pipe in its axial direction, and forming the steel pipe after heating the steel plate to about 900 ° C or higher A molding method such as a die quench method has been developed in which the die quenching method is performed in which the material is inserted into the mold and quenched in the mold simultaneously with the molding. According to the hydroform method, since a member that has been manufactured by welding a plurality of members can be manufactured by integral molding, the number of parts and welding locations can be reduced, and the manufacturing cost can also be reduced. In addition, according to the die quench method, a 1500 MPa class high-strength part can be formed by pressing, and a part with little spring back and hardly causing delayed fracture can be obtained with a small pressing force.

プレス成型時の鋼板の変形抵抗を少なくし、成型時の破断や亀裂の発生を防止するために、熱間でプレスすることが広く行われているが、通常の熱間プレス成形では、成形時の材料強度が低くなっているため、縦壁、すなわちプレス軸の方向に平行な方向の鋼板面、の破断耐力が低下しており、深絞り成形は困難であった。このため、成形対象とするのはプレスストローク方向の成形長さ、すなわち成形ストローク、の短い形状の部材に限られ、或いはまた、成形時に鋼板を押さえるブランクホルダーを使用しないで成形する方法もあるが、ブランクホルダーを使用しない場合は、成形時の材料の流動が規定されず、安定した成形形状を得ることが出来ないと言う問題がある。
また、上記のダイクエンチ法に関連して、特許文献1には、加熱された鋼板を成形型によりブレス成形すると同時に冷却して焼き入れされた成型品を得る際に、成形型に投入された加熱鋼板を成形型に接触させることなく成形型内で鋼板保持手段により保持し、成形型の成形開始作動に応じて鋼板保持手段を解除して成形する方法が開示されている。これによれば、加熱された鋼板がプレスされる際に金型に接触して温度の不均一か生じ、均一な焼き入れが行われないという欠点を解消している。
特開2003−145224号公報
In order to reduce the deformation resistance of the steel sheet during press forming and prevent the occurrence of breakage and cracks during forming, hot pressing is widely performed. Since the material strength of the steel sheet is low, the fracture strength of the vertical wall, that is, the steel plate surface in the direction parallel to the direction of the press axis, is reduced, making deep drawing difficult. For this reason, the forming object is limited to a member having a short forming length in the press stroke direction, that is, a forming stroke, or there is a method of forming without using a blank holder that holds the steel plate during forming. When the blank holder is not used, there is a problem that the flow of the material at the time of molding is not defined and a stable molded shape cannot be obtained.
Further, in relation to the above die quench method, Patent Document 1 discloses that the heated steel sheet is heated when the heated steel sheet is breath-formed by a forming die and simultaneously cooled and quenched to obtain a molded product. A method is disclosed in which a steel plate is held by a steel plate holding means in the forming die without contacting the forming die, and the steel plate holding means is released in accordance with the forming start operation of the forming die. According to this, when the heated steel plate is pressed, the mold is brought into contact with the mold to cause nonuniformity of temperature, thereby eliminating the disadvantage that uniform quenching is not performed.
JP 2003-145224 A

本発明は、上述の問題点に鑑み、鋼板のプレス成形法において、成形工程を増やすことなく、成形高さの大きい部品を破断を起こすことなく成形できるプレス成形方法及びその装置を提供することを課題とする。なお、本発明は、熱間プレスだけでなく、温度にかかわらず冷間プレスも対象とする。   In view of the above-described problems, the present invention provides a press forming method and an apparatus for forming a part having a high forming height without breaking without increasing the number of forming steps in the press forming method of a steel sheet. Let it be an issue. The present invention covers not only hot pressing but also cold pressing regardless of temperature.

本発明は、上記課題を解決するためになされたものである。
本第1発明は、鋼板をダイとパンチおよびブランクホルダーを少なくとも有する成形金型によりプレス成形する方法において、鋼板の端面を押込み手段により鋼板の流入方向に押し込みつつプレス成形することを特徴とする。
本第2発明は、本第1発明において、鋼板を500〜1000℃に加熱した後、前記鋼板の端面を前記押し込み手段により、鋼板の流入方向に押し込みつつプレス成形することを特徴とする。
The present invention has been made to solve the above problems.
The first invention is characterized in that, in a method of press-forming a steel plate with a molding die having at least a die, a punch and a blank holder, the end surface of the steel plate is press-formed while being pushed in the inflow direction of the steel plate by a pushing means.
The second invention is characterized in that, in the first invention, after the steel plate is heated to 500 to 1000 ° C., the end surface of the steel plate is press-formed while being pushed in the inflow direction of the steel plate by the pushing means.

本第3発明は、鋼板をプレス成形するダイとパンチおよびブランクホルダーを少なくとも有するプレス成形装置において、鋼板の端面を鋼板の流入方向に押し込む押込み手段を備えることを特徴とする。   The third invention is characterized in that in a press forming apparatus having at least a die for press forming a steel plate, a punch and a blank holder, a pressing means for pressing the end surface of the steel plate in the inflow direction of the steel plate is provided.

本第4発明は、本第3発明に記載のプレス成形装置において、前記押し込み手段は、前記ブランクホルダーと前記ダイとの間隙を前記鋼板の流入方向に進退する押し込み部材とこの押し込み部材を進退させるシリンダーからなることを特徴とする。
本第5発明は、本第3発明に記載のプレス成形装置において、前記押し込み手段は、前記ダイおよびブランクホルダーの対向する面に、外側面から内側面に向かって前記鋼板の流入方向に設けられた貫通孔と、この貫通孔内を進退する押し込み部材と、この押し込み部材を進退させるシリンダーとからなることを特徴とする。
According to a fourth aspect of the present invention, in the press molding apparatus according to the third aspect of the invention, the pushing means advances and retracts the pushing member that advances and retracts the gap between the blank holder and the die in the inflow direction of the steel plate. It consists of a cylinder.
According to a fifth aspect of the present invention, in the press molding apparatus according to the third aspect of the invention, the pushing means is provided on the opposing surfaces of the die and the blank holder in the inflow direction of the steel plate from the outer surface toward the inner surface. And a push-in member that advances and retreats in the through-hole, and a cylinder that advances and retreats the push-in member.

本第1及び第3の発明によれば、プレス成形において鋼板が流入方向に強制的に押し込まれるので成形時の鋼板の縦壁に発生する引張応力を低減でき、鋼板の破断耐力を超えることがないので、高強度の鋼板であっても安定した深絞り成形が可能となる。
本第2の発明によれば、熱間でプレス成形することにより、上記の効果に加えて、プレス成形後、高強度(引張強さ490〜1500MPa級)の成形品を容易に得ることができる。
According to the first and third aspects of the present invention, the steel sheet is forcibly pushed in the inflow direction in press forming, so that the tensile stress generated in the vertical wall of the steel sheet during forming can be reduced, and the breaking strength of the steel sheet can be exceeded. Therefore, stable deep drawing can be performed even with a high-strength steel sheet.
According to the second aspect of the present invention, in addition to the above effects, a high-strength (tensile strength 490-1500 MPa class) molded product can be easily obtained after press molding by performing hot press molding. .

本第4の発明によれば、本第3の発明の効果に加えて、簡潔な手段によって鋼板の端面を押し込むことができる。
本第5の発明によれば、本第3の発明の効果に加えて、プレスする鋼板が薄く、ダイとブランクホルダーとの間隙が小さい場合でも、確実に鋼板の端面を押し込むことができる。
According to the fourth aspect of the invention, in addition to the effect of the third aspect of the invention, the end face of the steel plate can be pushed in by simple means.
According to the fifth invention, in addition to the effect of the third invention, even when the steel plate to be pressed is thin and the gap between the die and the blank holder is small, the end surface of the steel plate can be reliably pushed.

以下、本発明を実施形態の図面を用いて説明する。
図1は、本発明の一実施形態のプレス成形装置を示す断面模式図であり、(a)は鋼板をセットした状態を、(b)は、その成形途中の状態をそれぞれ示している。
図1(a)、(b)において、プレス成形装置1は、ポンチ2、ダイ3および、ブランクホルダー4を有しており、ポンチ2はインナースライド5に、ブランクホルダー4はアウタースライド6にそれぞれ連結支持されている。また、インナースライド5、アウタースライド6はハウジング(図示せず)に昇降可能に設けられている。なお、図1においてポンチ2は上下方向に作動し、プレスストローク方向は上下方向とする。
Hereinafter, the present invention will be described with reference to the drawings of embodiments.
FIG. 1 is a schematic cross-sectional view showing a press forming apparatus according to an embodiment of the present invention, in which (a) shows a state in which a steel plate is set, and (b) shows a state during the forming.
1A and 1B, the press molding apparatus 1 has a punch 2, a die 3, and a blank holder 4. The punch 2 is on the inner slide 5, and the blank holder 4 is on the outer slide 6. Connected and supported. Moreover, the inner slide 5 and the outer slide 6 are provided in a housing (not shown) so as to be movable up and down. In FIG. 1, the punch 2 operates in the vertical direction, and the press stroke direction is the vertical direction.

本発明の成形装置は鋼板押し込み手段8を備えており、シリンダー9とシリンダー9の作動部9bの先端に取りつけられた押し込み部材としての押し込みプレート10とを有している。
押し込みプレート10は、被加工材である鋼板7がブランクホルダー4とダイ3との間にセットされ、固定された状態で形成されるブランクホルダー4とダイ3との間隙に沿って、鋼板の流入する方向(紙面の左右から中心側の方向)に進退可能に設けられる。
The forming apparatus of the present invention includes a steel plate pushing means 8 and has a cylinder 9 and a pushing plate 10 as a pushing member attached to the tip of the operating portion 9b of the cylinder 9.
The pushing plate 10 is configured such that a steel plate 7 as a workpiece is set between the blank holder 4 and the die 3 and the steel plate flows along the gap between the blank holder 4 and the die 3 formed in a fixed state. It is provided so as to be able to advance and retreat in a direction (a direction from the left and right sides of the drawing to the center side).

すなわち、シリンダー9は作動部9bの作動によって、その先端に連結された押し込みプレート10を押し、鋼板の端面に鋼板の流入方向にほぼ一致する方向の押し込み力を与える。
このシリンダー9は、シリンダーの作動力を押し込み力として効率的に鋼板に伝えるために、その進退軸の方向がプレスストロークの方向に直交する面内となるように設けることが好ましい。
ここで、鋼板の流入方向とは、ダイ3にセットされた鋼板がダイ3の凹部に押し込まれる際に移動する方向を言う。
That is, the cylinder 9 pushes the pushing plate 10 connected to the tip thereof by the action of the actuating portion 9b, and gives the pushing force in the direction substantially coinciding with the inflow direction of the steel plate to the end surface of the steel plate.
The cylinder 9 is preferably provided so that the advancing / retreating axis direction is in a plane perpendicular to the press stroke direction in order to efficiently transmit the cylinder operating force as a pushing force to the steel plate.
Here, the inflow direction of the steel plate refers to a direction in which the steel plate set on the die 3 moves when being pushed into the concave portion of the die 3.

なお、押し込みプレート10の先端は、押し込み作動時においては鋼板の端面に接触するようにすればよく、その形状は特に限定するものではないが、鋼板7と押し込みプレート10との接触部における押し込みプレート10の先端形状は、その接触部の幅方向および厚さ方向において、鋼板7端面の幅方向及び厚さ方向の形状(平面形状及び断面形状)に倣うようにすることが好ましい。
このような形状とすることによって、押し込みプレート10を進退させるシリンダー9による押し込み力を押し込みプレート10を介して鋼板の流入方向に効率的に伝えることができる。
The tip of the pushing plate 10 may be in contact with the end surface of the steel plate during the pushing operation, and the shape thereof is not particularly limited, but the pushing plate at the contact portion between the steel plate 7 and the pushing plate 10 is not limited. It is preferable that the tip shape of 10 follows the shape (planar shape and cross-sectional shape) in the width direction and the thickness direction of the end surface of the steel plate 7 in the width direction and the thickness direction of the contact portion.
By setting it as such a shape, the pushing force by the cylinder 9 which advances / retreats the pushing plate 10 can be efficiently transmitted to the inflow direction of the steel plate via the pushing plate 10.

すなわち、図1(b)に示すように、プレス成形の進行によってポンチ2が下降し、ダイ3の凹部に進入するにつれて、鋼板7がプレスストローク方向に引っ張られて、ダイ3の凹部に流入する。その際、この鋼板7の端面に押し込みプレート10を介して押し込み力を与え、ダイ3の凹部への鋼板7の流入を促進するものである。
これによって、プレスストローク方向の鋼板、すなわち鋼板7の縦壁に加わる引張応力が緩和され、鋼板7が過度に引っ張られて板厚が薄くなり、鋼板7の破壊耐力を超えることがなく、形状の安定した深絞り成形が可能となる。
That is, as shown in FIG. 1 (b), as the press molding proceeds, the punch 2 descends and enters the concave portion of the die 3, so that the steel plate 7 is pulled in the press stroke direction and flows into the concave portion of the die 3. . At that time, a pushing force is applied to the end surface of the steel plate 7 via the pushing plate 10 to promote the inflow of the steel plate 7 into the concave portion of the die 3.
As a result, the tensile stress applied to the steel plate in the press stroke direction, that is, the vertical wall of the steel plate 7 is relaxed, the steel plate 7 is excessively pulled to reduce the plate thickness, and the fracture strength of the steel plate 7 is not exceeded. Stable deep drawing is possible.

なお、押し込みプレート10の形状は、上述のように、プレス成形過程において鋼板7の端面に接触し、押し込み力を与え得るような形状とすればよいが、その厚さtは、鋼板7が固定された状態で形成されるブランクホルダー4とダイ3との間隙gに沿って、鋼板7の流入方向に進退可能な厚さ、すなわち、この間隙g未満とする。
また、押し込みプレート10の流入方向の長さlは、成形終了時点での鋼板7の端面の位置とダイ3及び/またはブランクホルダー4の外側面の位置との間隔以上とすることが好ましい。これにより、所要の押し込みプレート10の進退動作において、押し込みプレート10の後端とシリンダー9の作動部9bの接続部がダイ3及び/またはブランクホルダー4の外側面に接触して、それ以上の進退が確保できず、所要の押し込み力を鋼板の端面に与えられなくなることがない。
The shape of the indentation plate 10 may be a shape that can contact the end surface of the steel plate 7 and give an indentation force in the press forming process as described above, but the thickness t is fixed by the steel plate 7. The thickness of the blank holder 4 and the die 3 formed in this state is set to a thickness that allows the steel plate 7 to move forward and backward along the gap g, that is, less than the gap g.
The length l in the inflow direction of the push-in plate 10 is preferably equal to or greater than the distance between the position of the end surface of the steel plate 7 and the position of the outer surface of the die 3 and / or the blank holder 4 at the end of forming. Thereby, in the required advance / retreat operation of the push plate 10, the connecting portion of the rear end of the push plate 10 and the operating portion 9 b of the cylinder 9 comes into contact with the outer surface of the die 3 and / or the blank holder 4, and further advance / retreat thereof. Cannot be secured, and the required pushing force cannot be applied to the end face of the steel plate.

図2は、本発明の一実施形態のプレス成形装置におけるプレス成形の一例を示す斜視図であり、(a)は押し込み前の状態を、(b)は押し込み動作状態をそれぞれ示している。
この例では、プレス成形装置において、直方体状のポンチ(図示せず)を用い、上面視がほぼ矩形の鋼板7を直方体状の凹部を持つダイとブランクホルダー(いずれも図示せず)との間に挟持して、プレス成形により、図2(b)に示すような樋状の成形物14を成形するものである。
2A and 2B are perspective views showing an example of press forming in the press forming apparatus according to the embodiment of the present invention. FIG. 2A shows a state before pressing, and FIG. 2B shows a pressing operation state.
In this example, in a press molding apparatus, a rectangular parallelepiped punch (not shown) is used, and a steel plate 7 having a substantially rectangular top view is formed between a die having a rectangular parallelepiped recess and a blank holder (none of which are shown). And a bowl-shaped molded product 14 as shown in FIG. 2B is formed by press molding.

この例の場合、鋼板7の対向する2つの幅方向の端面は、プレス成形過程においてダイとブランクホルダーとの間において、ダイ面上に平行で、ダイ凹部に向いた方向に流れる。このとき、ダイ面に平行で成形品のフランジ部20a、20bが残る両側に対向して設けた矩形の押し込みプレート10とシリンダ9を備えた2組の鋼板押し込み手段8、8の2つの押し込みプレート10は、それぞれシリンダー9の作動によって鋼板7の幅方向(図2(b)におけるフランジ20a、20bの長手方向)の端面に接触し、この端面に対して、ダイ面に平行する方向の押し込み力、すなわち、鋼板に流入方向Fの押し込み力、を作用させ、プレス成形する。   In the case of this example, two opposing end faces in the width direction of the steel plate 7 flow in a direction toward the die recess between the die and the blank holder in parallel with the die surface in the press forming process. At this time, two pushing plates of two sets of steel plate pushing means 8 and 8 having a rectangular pushing plate 10 and a cylinder 9 provided opposite to both sides where the flange portions 20a and 20b of the molded product remain parallel to the die surface. 10 is in contact with the end surface of the steel plate 7 in the width direction (longitudinal direction of the flanges 20a and 20b in FIG. 2B) by the operation of the cylinder 9, and the pushing force in the direction parallel to the die surface is applied to this end surface. That is, a pressing force in the inflow direction F is applied to the steel sheet to perform press forming.

この押し込み力によって、プレス成形の際にプレスストローク方向、すなわち鋼板7の縦壁に加わる引張応力が緩和され、鋼板7が過度に引っ張られて板厚が薄くなり、鋼板7の破壊耐力を超えることがなく、成形高さの大きい上面視が矩形の開口部を有する樋状成形物14などの深絞り成形が可能となる。   This indentation force relieves the tensile stress applied to the press stroke direction, that is, the vertical wall of the steel plate 7 during press forming, and the steel plate 7 is excessively pulled to reduce the plate thickness and exceed the fracture strength of the steel plate 7. Therefore, it is possible to perform deep drawing such as a bowl-shaped molded product 14 having a rectangular opening with a large molding height in a top view.

図3は、本発明の一実施形態のプレス成形装置におけるプレス成形の他の例を示す斜視図であり、(a)は押し込み前の状態を、(b)は押し込み動作状態をそれぞれ示している。
この例では、プレス成形装置において、直方体状のポンチ(図示せず)を用い、上面視がほぼ矩形の鋼板7を直方体状の凹部を持つダイとブランクホルダー(いずれも図示せず)との間に挟持して、プレス成形により、図3(b)に示すような筒状の成形物15を成形するものである。
3A and 3B are perspective views showing another example of press forming in the press forming apparatus according to the embodiment of the present invention. FIG. 3A shows a state before pressing, and FIG. 3B shows a pressing operation state. .
In this example, in a press molding apparatus, a rectangular parallelepiped punch (not shown) is used, and a steel plate 7 having a substantially rectangular top view is formed between a die having a rectangular parallelepiped recess and a blank holder (none of which are shown). A cylindrical molded product 15 as shown in FIG. 3B is formed by press molding.

この例の場合、鋼板7のそれぞれ対向する2組の端面(4つの端面)は、プレス成形過程においてダイとブランクホルダーとの間隙を、それぞれ対向する2組の流入方向(4つの流入方向)、すなわち、鋼板セット時の端面からダイ凹部に向けた方向に流れる。このとき、成形品の直片部となる4方向からダイ面に平行な方向において2つの方向で対向するように設けた矩形の押し込みプレート10とシリンダー9を備えた4組の鋼板押し込み手段8,8,8,8の4つの押し込みプレート10は、それぞれシリンダー9の作動によって鋼板7の端面に接触し、この端面に対してダイ面に平行な方向の押し込み力、すなわち、鋼板の流入方向Fの押し込み力、を与えてプレス成形する。   In the case of this example, the two opposing end faces (four end faces) of the steel plate 7 are the two inflow directions (four inflow directions) facing each other in the gap between the die and the blank holder in the press molding process. That is, it flows in the direction from the end face when setting the steel plate toward the die recess. At this time, four sets of steel plate pushing means 8 provided with a rectangular pushing plate 10 and a cylinder 9 provided so as to face each other in two directions in the direction parallel to the die surface from the four directions as the straight piece portion of the molded product, The four pushing plates 10, 8, 8 contact the end surface of the steel plate 7 by the operation of the cylinder 9, respectively, and the pushing force in the direction parallel to the die surface with respect to this end surface, ie, the inflow direction F of the steel plate. Press molding is performed with an indentation force.

この押し込み力によって、プレス成形の際にプレスストローク方向、すなわち鋼板7の縦壁に加わる引張応力が緩和され、鋼板7が過度に引っ張られて板厚が薄くなり、鋼板7の破壊耐力を超えることがなく、筒状の成形物15の深絞り成形が可能となる。   This indentation force relieves the tensile stress applied to the press stroke direction, that is, the vertical wall of the steel plate 7 during press forming, and the steel plate 7 is excessively pulled to reduce the plate thickness and exceed the fracture strength of the steel plate 7. No deep drawing of the cylindrical molded product 15 is possible.

図4は、本発明の一実施形態のプレス成形装置におけるプレス成形の他の例を示す斜視図であり、(a)は押し込み前の状態を、(b)は押し込み動作状態をそれぞれ示している。
この例では、プレス成形装置において、上面視で角錐台状のポンチ(図示せず)を用い、上面視でほぼ台形状の鋼板7を上面視で台形状の開口部(凹部)を有するダイと、少なくとも鋼板の台形の斜辺側を押さえるブランクホルダー(いずれも図示せず)との間に挟持して、プレス成形により、図4(b)に示すような樋状の成形物16成形するものである。
4A and 4B are perspective views showing another example of press forming in the press forming apparatus according to the embodiment of the present invention. FIG. 4A shows a state before pressing, and FIG. 4B shows a pressing operation state. .
In this example, in a press forming apparatus, a die having a truncated pyramid shaped punch (not shown) in a top view, a substantially trapezoidal steel plate 7 in a top view, and a trapezoidal opening (concave portion) in a top view, In addition, it is sandwiched between blank holders (both not shown) that hold down at least the trapezoidal hypotenuse side of the steel plate, and is formed into a bowl-shaped molded product 16 as shown in FIG. 4 (b) by press molding. is there.

この例の場合、図4(b)に示すように、鋼板7の2つの斜辺の端面は、プレス成形過程においてダイとブランクホルダーとの間隙を、2つの流入方向、すなわち、ダイ面に平行な方向でダイ凹部に向った方向に対向するように流れる。このとき、ダイ面に平行な方向に対向して設けた矩形の押し込みプレート10とシリンダ9を備えた2組の鋼板押し込み手段8、8の2つの押し込みプレート10は、それぞれシリンダー9の作動によって台形状の鋼板7の斜辺の端面に接触し、この端面にダイ面に平行な方向の押し込み力、すなわち、鋼板フランジ部に流入方向Fの押し込み力、を与えてプレス成形する。   In the case of this example, as shown in FIG. 4 (b), the end surfaces of the two oblique sides of the steel plate 7 provide a gap between the die and the blank holder in the press forming process in two inflow directions, that is, parallel to the die surface. It flows so as to face the direction toward the die recess. At this time, the two pushing plates 10 of the two sets of steel plate pushing means 8, 8 provided with the rectangular pushing plate 10 and the cylinder 9 provided in the direction parallel to the die surface are respectively moved by the operation of the cylinder 9. Pressing is performed by contacting the end face of the hypotenuse of the shaped steel plate 7 and applying a pressing force in a direction parallel to the die surface to this end surface, that is, a pressing force in the inflow direction F to the steel plate flange portion.

この押し込み力によって、プレス成形の際にプレスストローク方向、すなわち鋼板7の縦壁に加わる引張応力が緩和され、鋼板7が過度に引っ張られて板厚が薄くなり、鋼板7の破壊耐力を超えることがなく、上面視で台形状の開口部を有する樋状成形物16の深絞り成形が可能となる。
なお、この例において、鋼板7の端面と接触する押し込みプレート10の端面は、鋼板7の端面形状に倣う形状となっており、押し込み力の鋼板への伝達がより効率的である。
This indentation force relieves the tensile stress applied to the press stroke direction, that is, the vertical wall of the steel plate 7 during press forming, and the steel plate 7 is excessively pulled to reduce the plate thickness and exceed the fracture strength of the steel plate 7. Therefore, it is possible to perform deep drawing of the bowl-shaped molded product 16 having a trapezoidal opening in a top view.
In this example, the end surface of the pushing plate 10 that comes into contact with the end surface of the steel plate 7 has a shape that follows the shape of the end surface of the steel plate 7, and transmission of the pushing force to the steel plate is more efficient.

図5は、本発明の他の実施形態のプレス成形装置における鋼板のプレス成形を示す斜視図であり、(a)は鋼板をセットした状態を、(b)は成形途中の状態をそれぞれ示している。
この実施形態においては、図1〜図4示した鋼板押し込み手段と異なり、押し込み部材としての押し込みプレート10の代わりに、押し込みプレートよりも厚さ(径)が大きい円筒状の押し込み部材11としたものである。すなわち、押し込み部材11の厚さ(径)dは、鋼板をブランクホルダーとダイとの間に挟持した際に形成される間隙gよりも大きいものとなっている。
FIG. 5 is a perspective view showing press forming of a steel plate in a press forming apparatus according to another embodiment of the present invention, wherein (a) shows a state in which the steel plate is set, and (b) shows a state in the middle of forming. Yes.
In this embodiment, unlike the steel plate pushing means shown in FIGS. 1 to 4, a cylindrical pushing member 11 having a larger thickness (diameter) than the pushing plate is used instead of the pushing plate 10 as the pushing member. It is. That is, the thickness (diameter) d of the pushing member 11 is larger than the gap g formed when the steel plate is sandwiched between the blank holder and the die.

このような押し込み部材11としては、例えば、シリンダー作動部9b自体、或いはシリンダーの作動部9bにシリンダーの軸方向の延長部、或いは外周に補強部を設けて、押し込み部材11としてもよい。図5の実施例の場合は、シリンダーの作動部自体を径dの大きくして、鋼板の端面への接触を大きくしたものである。   As such a pushing member 11, for example, the pushing member 11 may be formed by providing a cylinder working part 9b itself, or an extending part in the axial direction of the cylinder in the working part 9b of the cylinder, or a reinforcing part on the outer periphery. In the case of the embodiment of FIG. 5, the cylinder operating portion itself has a large diameter d to increase the contact with the end face of the steel plate.

上述のように、押し込み部材11の径dは、鋼板7をブランクホルダーとダイとの間に挟持した際に形成される間隙gよりも大きいため、図5(a)に示すように、ブランクホルダーとダイとの対向する面には、円筒状の押し込み部材11が進退できるように貫通孔12が形成されている、この貫通孔12は、上記の円筒状押し込み部材11が進退できる内径を有するものであればよく、鋼板7を挟持した際にダイとブランクホルダーとの間に形成される間隙と併せた内径が円筒状押し込み部材11の径dを超えていればよい。   As described above, since the diameter d of the pushing member 11 is larger than the gap g formed when the steel plate 7 is sandwiched between the blank holder and the die, as shown in FIG. A through-hole 12 is formed on the surface facing the die so that the cylindrical pushing member 11 can advance and retreat. The through-hole 12 has an inner diameter that allows the cylindrical pushing member 11 to advance and retreat. It suffices that the inner diameter combined with the gap formed between the die and the blank holder when the steel plate 7 is sandwiched exceeds the diameter d of the cylindrical pushing member 11.

このため、例えば、ダイとブランクホルダーの対向する面には、ダイおよびブランクホルダーの外側面から内側面に向かって鋼板の流入方向、すなわちダイ面に平行な方向に、貫通溝13a、13bが設けられている。
ダイおよびブランクホルダーの外側面からの貫通溝13a、13bの長さは、円筒状押し込み部材11がプレス成形の完了時において、少なくとも鋼板7の端面に接しうる位置までとすればよく、鋼板7のサイズ、押し込み部材11の長さ、シリンダーのストロークなどを勘案して決めればよい。
For this reason, for example, through grooves 13a and 13b are provided on the opposing surfaces of the die and the blank holder in the inflow direction of the steel plate from the outer surface to the inner surface of the die and the blank holder, that is, in the direction parallel to the die surface. It has been.
The lengths of the through-grooves 13a and 13b from the outer surfaces of the die and the blank holder may be at least a position where the cylindrical pushing member 11 can come into contact with the end face of the steel plate 7 when the press forming is completed. The size may be determined in consideration of the length, the length of the pushing member 11, the stroke of the cylinder, and the like.

これによって、被加工材の鋼板が薄く、ダイとブランクホルダーとの間隙が小さい場合でも、押し込み材を介して確実に鋼板の端面に押し込み力を与えることができるので、多様な鋼板の深絞り成形が可能となる。   As a result, even when the steel plate of the workpiece is thin and the gap between the die and the blank holder is small, an indentation force can be reliably applied to the end surface of the steel plate via the indenter, so that deep drawing of various steel plates Is possible.

本発明は、第2発明として記載したように、いわゆる熱間プレス成形にも適用できる。その際、鋼板の加熱温度は成形時の変形抵抗を低減するため500℃以上とし、加熱時のスケール生成を抑制し、金型への焼付を防止する観点から1000℃以下とする。
プレス成形後は、金型内で保持して焼き入れてもよいし、金型内に冷却媒体を導入して焼き入れしてもよい。またプレス成形後、型から取出して放冷または冷却手段により冷却しても良い。
The present invention can also be applied to so-called hot press forming as described in the second invention. At that time, the heating temperature of the steel sheet is set to 500 ° C. or higher in order to reduce deformation resistance during forming, and is set to 1000 ° C. or lower from the viewpoint of suppressing scale formation during heating and preventing seizure to the mold.
After press molding, it may be held and quenched in the mold, or it may be quenched by introducing a cooling medium into the mold. Further, after press molding, it may be taken out from the mold and cooled by cooling or cooling means.

以下、実施例により本発明をさらに具体的に説明する。
(実施例1)
Hereinafter, the present invention will be described more specifically with reference to examples.
Example 1

材料として、260(圧延方向)×300mm、厚さ1.6mmの440MPa級冷延鋼板を用いた。金型はメンバー用で、パンチは幅が80mm、高さが80mm、肩Rが5mm、ダイスは幅が84mm、肩Rが8mmを用い、しわ押さえ力を1000[kN]とした。本発明例として、図2に示すように金型の両側にシリンダを設置し、押し込みプレートによって金型上に設置した被加工材の端面を押し込める構造とした。シリンダーは最大荷重500[kN]、ストローク最大100mmのものを用いた。本発明では、パンチの押し込みと同時にシリンダに一定荷重150[kN]が加わるように荷重で制御して、成形加工した。その結果、割れもしわもない成形品を得ることが出来、縦壁の中央部の板厚を測定したところ、板厚減少率が10%以内に入っており、安定的な成形が可能であることが判った。
一方、比較例ではプレス加工中にシリンダと押し込みプレートを使用せずに、本発明例と同条件にて加工したところ、割れが発生して良成形品は得られなかった。
(実施例2)
As a material, a 440 MPa class cold rolled steel sheet of 260 (rolling direction) × 300 mm and a thickness of 1.6 mm was used. The die was for the member, the punch was 80 mm wide, 80 mm high, shoulder R was 5 mm, the die was 84 mm wide and the shoulder R was 8 mm, and the crease pressing force was 1000 [kN]. As an example of the present invention, as shown in FIG. 2, a cylinder is installed on both sides of a mold, and an end face of a workpiece placed on the mold is pushed in by a pushing plate. A cylinder with a maximum load of 500 [kN] and a maximum stroke of 100 mm was used. In the present invention, molding is performed by controlling the load so that a constant load of 150 [kN] is applied to the cylinder simultaneously with the pressing of the punch. As a result, a molded product without cracks and wrinkles can be obtained, and when the thickness of the central part of the vertical wall is measured, the thickness reduction rate is within 10%, and stable molding is possible. I found out.
On the other hand, in the comparative example, when a cylinder and an indentation plate were not used during the pressing process, and processing was performed under the same conditions as in the example of the present invention, cracks occurred and a good molded product was not obtained.
(Example 2)

材料として、250(圧延方向)×250mm、厚さ0.7mmの440MPa級冷延鋼板を用いた。金型は角筒絞り用で、パンチ寸法は120×120mm、高さが80mm、肩Rが5mm、ダイスは122×122mm、肩Rが6mmを用い、しわ押さえ力を500[kN]とした。本発明例として、図3に示すように金型の外側4方向にシリンダを設置し、押し込みプレートによって金型上に設置した被加工材の端面を押し込める構造とした。シリンダは最大荷重200[kN]、ストローク最大80mmのものを用いた。本発明では、パンチの押し込みと同時にシリンダに一定荷重50[kN]が加わるように荷重で制御して、成形加工した。その結果、割れもしわもない成形品を得ることが出来、縦壁の中央部の板厚を測定したところ、板厚減少率が10%以内に入っており、安定的な成形が可能であることが判った。
一方、比較例ではプレス加工中にシリンダと押し込みプレートを使用せずに、本発明例と同条件にて加工したところ、割れが発生して良成形品は得られなかった。
(実施例3)
As a material, a 440 MPa class cold rolled steel sheet of 250 (rolling direction) × 250 mm and a thickness of 0.7 mm was used. The die was for rectangular tube drawing, the punch size was 120 x 120 mm, the height was 80 mm, the shoulder R was 5 mm, the die was 122 x 122 mm, the shoulder R was 6 mm, and the wrinkle holding force was 500 [kN]. As an example of the present invention, as shown in FIG. 3, a cylinder is installed in four directions on the outer side of the mold, and the end surface of the workpiece placed on the mold is pushed in by a pushing plate. A cylinder with a maximum load of 200 [kN] and a maximum stroke of 80 mm was used. In the present invention, molding is performed by controlling the load so that a constant load of 50 [kN] is applied to the cylinder simultaneously with the pressing of the punch. As a result, a molded product without cracks and wrinkles can be obtained, and when the thickness of the central part of the vertical wall is measured, the thickness reduction rate is within 10%, and stable molding is possible. I found out.
On the other hand, in the comparative example, when a cylinder and an indentation plate were not used during the pressing process, and processing was performed under the same conditions as in the example of the present invention, cracks occurred and a good molded product was not obtained.
(Example 3)

材料として、260(圧延方向)×300mm、厚さ1.6mmの熱間プレス用鋼板を用いた。ここで用いた熱間プレス用鋼板は高い焼き入れ性により、あらかじめ炉でオーステナイト域に加熱した後にプレス時に冷却されることで、プレス成形品の到達強度が1500MPa以上となる鋼板である。金型はメンバー用で、パンチは幅が80mm、高さが80mm、肩Rが5mm、ダイスは幅が84mm、肩Rが8mmを用い、しわ押さえ力を200[kN]とした。本発明例として、図1に示すように金型の両側にシリンダを設置し、押し込みプレートによって金型上に設置した被加工材の端面を押し込める構造とした。シリンダは最大荷重500[kN]、ストローク最大100mmのものを用いた。本発明では、被加工材をあらかじめ電気炉で摂氏約900℃に加熱しておき、熱間の状態で金型に設置後、パンチの押し込みと同時にシリンダに一定荷重75[kN]が加わるように荷重で制御して、成形加工した。その結果、割れもしわもない成形品を得ることが出来、縦壁の中央部の板厚を測定したところ、板厚減少率が10%以内に入っており、安定的な成形が可能であることが判った。
一方、比較例ではプレス加工中にシリンダと押し込みプレートを使用せずに、本発明例と同条件にて加工したところ、割れが発生して良成形品は得られなかった。
As a material, a steel plate for hot pressing having 260 (rolling direction) × 300 mm and a thickness of 1.6 mm was used. The steel sheet for hot pressing used here is a steel sheet that has a high hardenability and is heated in advance in an austenite region in a furnace and then cooled during pressing, so that the ultimate strength of the press-formed product becomes 1500 MPa or more. The die was for the member, the punch was 80 mm wide, 80 mm high, shoulder R 5 mm, the die 84 mm wide and shoulder R 8 mm, and the crease pressing force was 200 [kN]. As an example of the present invention, as shown in FIG. 1, a cylinder is installed on both sides of a mold, and an end face of a workpiece placed on the mold is pushed in by a pushing plate. A cylinder with a maximum load of 500 [kN] and a maximum stroke of 100 mm was used. In the present invention, the workpiece is preheated to about 900 ° C. in an electric furnace, and after being placed in the hot mold, a constant load of 75 [kN] is applied to the cylinder simultaneously with the pressing of the punch. The molding process was controlled by the load. As a result, a molded product without cracks and wrinkles can be obtained, and when the thickness of the central part of the vertical wall is measured, the thickness reduction rate is within 10%, and stable molding is possible. I found out.
On the other hand, in the comparative example, when a cylinder and an indentation plate were not used during the pressing process, and processing was performed under the same conditions as in the example of the present invention, cracks occurred and a good molded product was not obtained.

本発明の一実施形態の熱間プレス成形装置を示す断面模式図であり、(a)は、鋼板をセットした状態を、(b)は成形途中の状態をそれぞれ示す。It is a cross-sectional schematic diagram which shows the hot press forming apparatus of one Embodiment of this invention, (a) shows the state which set the steel plate, (b) shows the state in the middle of shaping | molding, respectively. 本発明の一実施形態の熱間プレス成形装置におけるプレス成形の一例を示す斜視図であり、(a)は押し込み前の状態を、(b)は、押し込み動作状態をそれぞれ示す。It is a perspective view which shows an example of the press molding in the hot press molding apparatus of one Embodiment of this invention, (a) shows the state before pushing, (b) shows the pushing operation state, respectively. 本発明の一実施形態の熱間プレス成形装置におけるプレス成形の他の例を示す斜視図であり、(a)は押し込み前の状態を、(b)は押し込み動作状態をそれぞれ示す。It is a perspective view which shows the other example of press molding in the hot press molding apparatus of one Embodiment of this invention, (a) shows the state before pushing, (b) shows the pushing operation state, respectively. 本発明の一実施形態の熱間プレス成形装置におけるプレス成形の他の例を示す斜視図であり、(a)は押し込み前の状態を、(b)は押し込み動作状態をそれぞれ示す。It is a perspective view which shows the other example of press molding in the hot press molding apparatus of one Embodiment of this invention, (a) shows the state before pushing, (b) shows the pushing operation state, respectively. 本発明の他の実施形態の熱間プレス成形装置を示す斜視図であり、(a)は鋼板をセットした状態を、(b)は成形途中の状態をそれぞれ示す。It is a perspective view which shows the hot press molding apparatus of other embodiment of this invention, (a) shows the state which set the steel plate, (b) shows the state in the middle of shaping | molding, respectively.

符号の説明Explanation of symbols

1 熱間プレス成形装置
2 ポンチ
3 ダイ
4 ブランクホルダー
5 インナースライド
6 アウタースライド
7 被加工材(鋼板)
8 押し込み手段
9 シリンダー
9a シリンダー基部
9b シリンダー作動部
10 押し込み部材(押込みプレート)
11 押し込み部材(シリンダー作動部)
12 貫通孔
13a、13b 貫通溝
14 プレス成型品
15 プレス成型品
16 プレス成型品
20a フランジ
20b フランジ
F 押し込み方向(流入方向)
t 押し込み部材の板厚
d 押し込み部材の径
l 押し込み部材(押し込みプレート)の長さ
w 押し込み部材(押し込みプレート)の幅
g 間隙
1 Hot press forming equipment
2 punch
3 die
4 Blank holder
5 Inner slide
6 Outer slide
7 Work material (steel plate)
8 Pushing means
9 cylinders
9a Cylinder base
9b Cylinder operating part
10 Pushing member (pushing plate)
11 Push-in member (cylinder operating part)
12 Through hole
13a, 13b Through groove
14 Press molded products
15 Press molded products
16 Press molded products
20a flange
20b flange
F Push direction (inflow direction)
t Thickness of the pushing member d Diameter of the pushing member l Length of the pushing member (pushing plate) w Width of the pushing member (pushing plate) g Gap

Claims (5)

鋼板をダイとパンチおよびブランクホルダーを少なくとも有する成形金型によりプレス成形する方法において、鋼板の端面を押込み手段により鋼板の流入方向に押し込みつつプレス成形することを特徴とするプレス成形方法。   A method for press-forming a steel plate with a forming die having at least a die, a punch and a blank holder, wherein the end surface of the steel plate is pressed in the inflow direction of the steel plate by a pressing means. 鋼板を500〜1000℃に加熱した後、前記鋼板の端面を前記押込み手段により鋼板の流入方向に押し込みつつプレス成形することを特徴とする請求項1記載のプレス成形方法。   2. The press forming method according to claim 1, wherein after the steel plate is heated to 500 to 1000 [deg.] C., the end surface of the steel plate is press-formed while being pushed in the inflow direction of the steel plate by the pushing means. 鋼板をプレス成形するダイとパンチおよびブランクホルダーを少なくとも有するプレス成形装置において、鋼板の端面を鋼板の流入方向に押し込む押込み手段を備えることを特徴とする熱間プレス成形装置。   A hot press forming apparatus comprising a pressing means for pressing an end face of a steel sheet in an inflow direction of the steel sheet in a press forming apparatus having at least a die for pressing the steel plate, a punch and a blank holder. 前記押し込み手段は、前記ブランクホルダーと前記ダイとの間隙を前記鋼板の流入方向に進退する押し込み部材と、この押し込み部材を進退させるシリンダーからなることを特徴とする請求項3に記載の熱間プレス成形装置。   4. The hot press according to claim 3, wherein the pushing means includes a pushing member that advances and retracts a gap between the blank holder and the die in an inflow direction of the steel plate, and a cylinder that advances and retracts the pushing member. Molding equipment. 前記押し込み手段は、前記ダイおよびブランクホルダーの対向する面に、外側面から内側面に向かって前記鋼板の流入方向に設けられた貫通孔と、この貫通孔内を進退する押し込み部材と、この押し込み部材を進退させるシリンダーからなることを特徴とする請求項3に記載の熱間プレス成形装置。   The pushing means includes a through hole provided in an inflow direction of the steel plate from the outer surface to the inner surface on the opposing surfaces of the die and the blank holder, a pushing member that advances and retreats in the through hole, and the pushing 4. The hot press forming apparatus according to claim 3, comprising a cylinder for advancing and retracting the member.
JP2005114972A 2005-04-12 2005-04-12 Press forming method, and forming device Withdrawn JP2006289453A (en)

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Cited By (7)

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JP2010149184A (en) * 2008-11-21 2010-07-08 Sumitomo Metal Ind Ltd Hot press molded product, and equipment and method for manufacturing the same
JP2015107493A (en) * 2013-12-03 2015-06-11 Jfeスチール株式会社 Die for hot press, hot press molding method, and hot press molding
JP2015123490A (en) * 2013-12-27 2015-07-06 アイダエンジニアリング株式会社 Drawing method and device
JP2016175130A (en) * 2016-07-05 2016-10-06 アイダエンジニアリング株式会社 Drawing method and device
CN107932954A (en) * 2017-12-22 2018-04-20 无锡市创恒机械有限公司 A kind of product molding device
CN112404279A (en) * 2020-10-29 2021-02-26 郑州日产汽车有限公司 Flexible die plate positioning device, combined positioning method and automatic positioning method
JPWO2021060274A1 (en) * 2019-09-24 2021-04-01

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010149184A (en) * 2008-11-21 2010-07-08 Sumitomo Metal Ind Ltd Hot press molded product, and equipment and method for manufacturing the same
JP2015107493A (en) * 2013-12-03 2015-06-11 Jfeスチール株式会社 Die for hot press, hot press molding method, and hot press molding
JP2015123490A (en) * 2013-12-27 2015-07-06 アイダエンジニアリング株式会社 Drawing method and device
JP2016175130A (en) * 2016-07-05 2016-10-06 アイダエンジニアリング株式会社 Drawing method and device
CN107932954A (en) * 2017-12-22 2018-04-20 无锡市创恒机械有限公司 A kind of product molding device
JPWO2021060274A1 (en) * 2019-09-24 2021-04-01
WO2021060274A1 (en) * 2019-09-24 2021-04-01 日本製鉄株式会社 Method for manufacturing press-formed article, press-formed article, and press-forming device
CN114430703A (en) * 2019-09-24 2022-05-03 日本制铁株式会社 Method for manufacturing press-molded article, and press-molding device
JP7323824B2 (en) 2019-09-24 2023-08-09 日本製鉄株式会社 Method for manufacturing press-formed product and press-forming apparatus
US11925968B2 (en) 2019-09-24 2024-03-12 Nippon Steel Corporation Method for manufacturing press-formed article, press-formed article, and press-forming apparatus
CN114430703B (en) * 2019-09-24 2024-08-02 日本制铁株式会社 Method for producing press-molded article, and press-molding device
CN112404279A (en) * 2020-10-29 2021-02-26 郑州日产汽车有限公司 Flexible die plate positioning device, combined positioning method and automatic positioning method

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