WO2024047968A1 - Procédé de fabrication d'un article moulé à la presse - Google Patents

Procédé de fabrication d'un article moulé à la presse Download PDF

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Publication number
WO2024047968A1
WO2024047968A1 PCT/JP2023/019071 JP2023019071W WO2024047968A1 WO 2024047968 A1 WO2024047968 A1 WO 2024047968A1 JP 2023019071 W JP2023019071 W JP 2023019071W WO 2024047968 A1 WO2024047968 A1 WO 2024047968A1
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WO
WIPO (PCT)
Prior art keywords
press
flange
vertical wall
top plate
ridgeline
Prior art date
Application number
PCT/JP2023/019071
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English (en)
Japanese (ja)
Inventor
裕之 田中
Original Assignee
Ｊｆｅスチール株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to JP2023551205A priority Critical patent/JPWO2024047968A1/ja
Publication of WO2024047968A1 publication Critical patent/WO2024047968A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles

Definitions

  • the present invention relates to a method for manufacturing a press-formed product, and particularly includes a top plate portion and a vertical wall portion continuous to the top plate portion via a ridgeline portion, and includes a top plate portion, a ridgeline portion, and an end portion of the vertical wall portion.
  • the present invention relates to a method of manufacturing a press-formed product having a continuously formed outward flange portion.
  • high-strength steel plates also referred to as high-tensile steel materials
  • a tensile strength of 590 MPa or higher are increasingly being applied to vehicle body structural parts.
  • an automobile part such as a floor cross member, includes a top plate part 5, a vertical wall part 7, and a ridgeline part 9 connecting the top plate part 5 and the vertical wall part 7.
  • a press-formed product 1 having an outward flange portion 3 continuously formed at the end of a plate portion 5, a ridgeline portion 9, and a vertical wall portion 7.
  • the portion of the outward flange portion 3 that is continuous with the ridgeline portion 9 (hereinafter referred to as the “corner flange portion”) undergoes stretch flange deformation, causing the corner flange portion 3b to deform. Cracks are more likely to occur at the tip.
  • Patent Document 1 discloses a method for manufacturing a saddle-shaped press-formed product. ing.
  • the top plate constituent parts of the blank are curved, a first force directed from the inner surface side to the outer face side of the blank is applied, and a second force is applied to each of the outer face sides of the vertical wall constituent parts in the direction facing each other.
  • Press forming is performed by applying a composite force of a force and a third force in the opposite direction to the first force.
  • the method disclosed in Patent Document 1 is a method of molding the top plate portion, the vertical wall portion, and the outward flange portion at the same time.
  • Patent Document 2 discloses, as another press forming method, a press forming method in which a metal plate is formed into a U-shaped cross section and then the outward flange portion is bent.
  • a press forming method in which a metal plate is formed into a U-shaped cross section and then the outward flange portion is bent.
  • forming of the flange starts from the top plate and the vertical wall, thereby reducing strain in the outward flange. It is said that it can be dispersed on the vertical wall side.
  • Patent Document 3 discloses that an outward flange is formed by a shearing step of forming a stepped portion in a workpiece having a top plate, a vertical wall, and a flange, and a cutting step of removing an unnecessary portion near the stepped portion.
  • a press molding method is disclosed.
  • a press molding method in which a metal plate is molded into a U-shaped cross section and then the outward flange portion is bent can use a simple mold and improve dimensional accuracy.
  • the connection between the ridgeline and the corner flange of the outward flange (hereinafter sometimes simply referred to as the "corner flange connection”) may buckle ( A problem arose in that wrinkles and creases were more likely to occur.
  • Patent Document 3 has a problem in that the mold structure is complicated and a cutting step is required.
  • the present invention has been made in view of the above problems, and an object of the present invention is to include a top plate portion and a vertical wall portion continuous to the top plate portion via a ridgeline portion, and to When manufacturing a press-formed product that has an outward flange that is continuously formed at the end of a vertical wall, there is no need to use a mold with a complicated structure, and buckling does not occur at the connection of the corner flange.
  • Another object of the present invention is to provide a method for manufacturing a press-formed product that can stably produce a press-formed product with good dimensional accuracy.
  • the method for manufacturing a press-formed product according to the present invention includes a main body portion having at least a top plate portion and a vertical wall portion formed via a ridgeline portion, and an end portion of the main body portion having the top plate.
  • a method for manufacturing a press-molded product having an outward flange portion formed continuously on the ridgeline portion and the vertical wall portion comprising: a top plate portion and a vertical wall portion formed via the ridgeline portion; an intermediate molding step of molding an intermediate molded product having an outwardly swollen stepped portion at the root of a portion corresponding to the outward flange molded into the outward flange portion;
  • the present invention is characterized by comprising a target shape forming step of bending the outer flange portion outward and forming the outward flange portion into a target shape.
  • the intermediate forming step includes forming the top plate portion, the ridgeline portion, the vertical wall portion, and the step-shaped portion. , which is characterized by press molding in one step.
  • the intermediate forming step is performed after press-forming the top plate portion, the ridgeline portion, and the vertical wall portion.
  • the step-shaped portion is press-molded.
  • the method for manufacturing a press-formed product according to the present invention includes a top plate portion and a vertical wall portion continuous to the top plate portion via a ridgeline portion, and a vertical wall portion continuous to the top plate portion, the ridgeline portion, and the end portion of the vertical wall portion.
  • FIG. 1 is an explanatory diagram of a method for manufacturing a press-formed product according to an embodiment.
  • FIG. 2 is a diagram showing an analysis result of the forming process of the target shape forming process according to the embodiment.
  • FIG. 3 is a diagram schematically showing the forming process of the target shape forming process according to the embodiment.
  • FIG. 4 is an explanatory diagram of an example of a press-formed product targeted by the present invention.
  • FIG. 5 is an explanatory diagram of a conventional method for manufacturing a press-molded product.
  • FIG. 6 is a diagram showing an analysis result of a molding process for molding an outward flange portion in a conventional example.
  • FIG. 7 is a diagram schematically showing a molding process for molding an outward flange portion in a conventional example.
  • the object of the present invention is a press-molded product 1 having an outward flange portion 3, which includes a top plate portion 5, a vertical wall portion 7, and a top plate portion 5 and a vertical wall.
  • the main body part 11 has a ridgeline part 9 connecting the parts 7.
  • the press-formed product 1 has an outward flange portion 3 formed at an end of the main body portion 11 and continuous with the top plate portion 5, the ridgeline portion 9, and the vertical wall portion 7.
  • the press-formed product 1 includes a horizontal flange portion 13 at the lower end of the vertical wall portion 7.
  • the portions of the outward flange portion 3 that are continuous with the top plate portion 5, the ridgeline portion 9, and the vertical wall portion 7 will be referred to as the top plate flange portion 3a, the corner flange portion 3b, and the vertical wall flange, respectively. It is called part 3c.
  • FIG. 5 is a diagram showing a conventional method for forming the press-formed product 1.
  • an intermediate molded product having a top plate portion 5, a ridgeline portion 9, a vertical wall portion 7, and a horizontal flange portion 13 at the lower end of the vertical wall portion 7 is manufactured.
  • 15 is formed.
  • the intermediate molded product 15 has a top plate part 5, a ridgeline part 9, and a vertical wall part 7 extending from the end thereof, and these extension parts form the outward flange part 3 (top plate flange part 3a, top plate flange part 3a, They become a corner flange portion 3b and a vertical wall flange portion 3c).
  • the extending portion is referred to as the outward flange equivalent portion 17.
  • Each part of the intermediate molded product 15 may be press-molded at the same time, or each part may be press-molded individually. Thereafter, as shown in FIG. 5(b), the outward flange portion 17 of the intermediate molded product 15 is bent outward to form the outward flange portion 3, resulting in a press molded product 1 having the target shape.
  • a bending force is first inputted to the top plate flange equivalent part 17a and the vertical wall flange equivalent part 17c. Then, in a subsequent forming method in which the outward flange equivalent portion 17 is bent, a bending force may be input to the corner flange equivalent portion 17b.
  • FIG. 6 a steel plate with a thickness of 1.4 mm and a tensile strength of 590 MPa class is used, and the target shape is that the height of the outward flange part 3 is 18 mm, and the top plate part 5, ridge line part 9, vertical wall part 7 and the outward facing It is a figure which shows the result of FEM analysis about the case where R of the boundary part with the flange part 3 is 3 mm.
  • FIG. 6 the state of the intermediate molded product 15 before the outward flange portion 3 is molded (FIG. 6(a)) is changed to the state where the outward flange portion 3 is bent and raised to the bottom dead center of molding (FIG. 6(d)). ), including intermediate stages.
  • the plate thickness increase rate is calculated by determining the difference between the plate thickness at the relevant portion and the plate thickness of the blank metal plate, and calculating the ratio to the plate thickness of the blank metal plate.
  • FIG. 7 is a diagram schematically showing the results of a more detailed study of the process by which wrinkles and folds occur in conventional press forming.
  • FIG. 7 shows a cut surface taken in the direction of arrow A along the ridgeline 9 of the press-formed product 1 shown in FIG.
  • the state of the punch 19, die 20, lower pad 21, and metal plate 23 up to (FIG. 7(e)) is shown.
  • the numerical value such as [30 mmup] is the distance in the press forming direction in consideration of the plate thickness to the forming bottom dead center of the die 20 at the relevant position. Therefore, for example, the position of the die 20 at "30 mmup" is +30 mm in the opposite direction of press forming from the bottom dead center of the press.
  • the inventor focused on the deformation of the metal plate 23 from [30 mm up] to [24 mm up] in FIG. Such deformation occurs because the ends of the metal plate 23 are free to deform, leading to folding, so in order to prevent this, it is possible to restrain the free deformation of the ends of the metal plate 23.
  • it since it is necessary to mold the corner flange equivalent portion 17b into the corner flange portion 3b, it is difficult to completely restrain the end portion of the metal plate 23 with a mold.
  • the root portions of the outward flange equivalent portions 25 (the top plate flange equivalent portion 25a, the corner flange equivalent portion 25b, and the vertical wall flange equivalent portion 25c) of the intermediate molded product 24 include: A step-shaped portion 27 that is a step that swells outward is provided.
  • the outward flange equivalent portion 25 is formed into the outward flange portion 3 (top plate flange portion 3a, corner flange portion 3b, and vertical wall flange portion 3c) to obtain the target shape. .
  • FIGS. 2(a) to 2(d) are diagrams showing the results of FEM analysis of the press forming process of the intermediate molded product 24 into the target shape.
  • FIG. 2A shows an intermediate molded product 24 (before flange molding) in which a stepped portion 27 is formed.
  • FIGS. 2(b) to 2(d) show the process of forming the flange portion.
  • FIG. 3 is a diagram schematically showing a molding process of molding the intermediate molded product 24 into a target shape in press molding of the present invention. 3 shows the punch 19, the die 20, the lower pad 21, and the metal during the process from [38mmup] to [4mmup] on a cut surface cut in the direction of arrow A along the ridgeline 9, as shown in FIG. The state of the board 23 is shown.
  • connection part 31 between the ridgeline part 9 and the corner flange equivalent part 25b has a step-shaped part 27 formed therein, so that it can be wrapped around the die 20. become.
  • the outward flange equivalent portion 25 begins to contact the punch 19, and at [24 mmup], the tip of the metal plate 23 is bent toward the die 20 side.
  • the tip of the outward flange equivalent portion 25 does not approach the die 20 side because the stepped portion 27 is formed. Therefore, the connecting portion 31 (see FIG. 1(a)) between the ridgeline portion 9 and the corner flange equivalent portion 25b is not bent at an acute angle.
  • the outward flange equivalent portion 25 is formed without being folded in the gap between the die 20 and the punch 19 at [10 mm up]. Thereafter, the molding progresses to [4 mmup], and the outward flange portion 3 is formed at the bottom dead center of molding, and the connecting portion 33 (see FIG. 1(b)) between the ridgeline portion 9 and the corner flange portion 3b does not wrinkle.
  • the connecting portion 31 between the ridgeline portion 9 and the corner flange equivalent portion 25b wraps around the die 20 in the initial stage of molding. As a result, the connecting portion does not get into the gap between the lower pad 21 and the punch 19 and become folded, and the occurrence of wrinkles is prevented.
  • step-shaped portion 27 formed in the intermediate forming step can be press-formed at the same time as the top plate portion 5, vertical wall portion 7, and ridgeline portion 9 are formed. Molding in one step makes manufacturing more efficient. Alternatively, the stepped portion 27 may be press-molded after the top plate portion 5, the vertical wall portion 7, and the ridgeline portion 9 are formed.
  • a bending force is first input to the top plate flange equivalent portion 25a and the vertical wall flange equivalent portion 25c. do. After that, it is preferable to input bending force to the corner flange equivalent portion 25b. By doing so, it is possible to prevent cracks from occurring at the tip of the corner flange portion 3b.
  • the orthogonal cross section of the ridgeline portion 9 having the vertical wall portions 7 on both sides of the top plate portion 5 and the horizontal flange portion 13 at the lower end of the vertical wall portion 7 is hat-shaped.
  • the present invention is not limited thereto. That is, in the present invention, the orthogonal cross section of the ridgeline portion 9 without the horizontal flange portion 13 may be U-shaped, or a hat-shaped or U-shaped one is divided in half in the direction of the ridgeline portion 9 of the top plate portion 5. It may be shaped like a letter or L.
  • bending or drawing is suitable for forming the outwardly bulging step-shaped portion of the present invention.
  • the outward flange portion 3 is formed by bending the stepped portion, it becomes easy to form the outward flange portion 3 even when the width thereof is wide.
  • the stepped portion is formed by shear forming as described in Patent Document 3, the width of the flange portion may be restricted due to the fracture limit of the material, which may be undesirable.
  • press forming analysis of the press-formed product 1 shown in FIG. 4, which is the object of the present invention, and press forming of the actual material were performed.
  • the high tensile strength material a 980 MPa class steel plate with a plate thickness of 1.4 mm was used.
  • the press-molded product 1 has a hat shape in which the width of the top plate portion 5 is 84 mm, the height of the vertical wall portion 7 is 100 mm, and the length of the ridge line portion 9 is 180 mm.
  • the outward flange part 3 the outward flange width as defined in FIG. It was set to 3 mm.
  • a press is used to form an outward flange portion 3 on an intermediate molded product 15 (see FIG. 5(a)) press-formed using the blank model of the high tensile material. Molding analysis was performed. As a conventional example, as shown in FIGS. 5 and 6, a press forming analysis was conducted in which the outward flange portion 3 was formed without providing the stepped portion 27 at the root portion of the corner flange equivalent portion 17b. In addition, as an example of the invention, as shown in FIG. 1(a), a stepped portion 27 is provided at the root portion of the corner flange equivalent portion 25b on the intermediate molded product 24, and press molding is performed to form the outward flange portion 3.
  • the present invention provides a press-formed product that can stably produce press-formed products with good dimensional accuracy without using a mold with a complicated structure and without causing buckling at the connection portion of the corner flange.
  • a manufacturing method can be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

Ce procédé de fabrication d'un article moulé à la presse (1) est un procédé de fabrication d'un article moulé à la presse (1) présentant une partie de corps principal (11), qui présente une partie de plaque supérieure (5) et des parties de paroi verticale (7) formées avec des parties de ligne de crête (9) interposées entre celles-ci, et une partie de bride externe (3) formée sur une extrémité de la partie de corps principal (11) de manière à être continue à partir de la partie de plaque supérieure (5), des parties de ligne de crête (9) et des parties de paroi verticale (7), le procédé comportant : une étape de moulage intermédiaire destinée à mouler un article moulé intermédiaire (24) qui présente la partie de plaque supérieure (5) et les parties de paroi verticale (7) formées avec les parties de ligne de crête (9) interposées entre celles-ci et qui présente une partie de formation de pas (27) au niveau d'une section de racine d'une partie équivalente de bride vers l'extérieur (25) de sorte que la partie équivalente de bride vers l'extérieur (25) gonfle vers l'extérieur ; et une étape de moulage de forme cible destinée à plier la partie équivalente de bride vers l'extérieur (25) de l'article moulé intermédiaire (24) vers l'extérieur, à former une partie de bride vers l'extérieur (3) et à mouler une forme cible.
PCT/JP2023/019071 2022-08-29 2023-05-23 Procédé de fabrication d'un article moulé à la presse WO2024047968A1 (fr)

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JP2022-135517 2022-08-29

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014148618A1 (fr) * 2013-03-21 2014-09-25 新日鐵住金株式会社 Procédé de production pour élément moulé par pressage et dispositif de moulage par pressage
WO2016194963A1 (fr) * 2015-06-01 2016-12-08 新日鐵住金株式会社 Produit moulé à la presse, procédé de moulage à la presse et dispositif de moulage à la presse
WO2019216317A1 (fr) * 2018-05-11 2019-11-14 日本製鉄株式会社 Procédé de fabrication d'un article moulé à la presse en forme de selle, dispositif de moulage à la presse et procédé de fabrication pour fabriquer un article moulé à la presse en forme de selle
WO2022049916A1 (fr) * 2020-09-03 2022-03-10 Ｊｆｅスチール株式会社 Procédé de fabrication d'un article formé à la presse et dispositif de pressage
JP2022091379A (ja) * 2020-12-09 2022-06-21 東プレ株式会社 プレス部品の製造方法およびプレス部品

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014148618A1 (fr) * 2013-03-21 2014-09-25 新日鐵住金株式会社 Procédé de production pour élément moulé par pressage et dispositif de moulage par pressage
WO2016194963A1 (fr) * 2015-06-01 2016-12-08 新日鐵住金株式会社 Produit moulé à la presse, procédé de moulage à la presse et dispositif de moulage à la presse
WO2019216317A1 (fr) * 2018-05-11 2019-11-14 日本製鉄株式会社 Procédé de fabrication d'un article moulé à la presse en forme de selle, dispositif de moulage à la presse et procédé de fabrication pour fabriquer un article moulé à la presse en forme de selle
WO2022049916A1 (fr) * 2020-09-03 2022-03-10 Ｊｆｅスチール株式会社 Procédé de fabrication d'un article formé à la presse et dispositif de pressage
JP2022091379A (ja) * 2020-12-09 2022-06-21 東プレ株式会社 プレス部品の製造方法およびプレス部品

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