WO2023153034A1 - Procédé de moulage à la presse et procédé de fabrication d'un article moulé à la presse - Google Patents

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

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Publication number
WO2023153034A1
WO2023153034A1 PCT/JP2022/041902 JP2022041902W WO2023153034A1 WO 2023153034 A1 WO2023153034 A1 WO 2023153034A1 JP 2022041902 W JP2022041902 W JP 2022041902W WO 2023153034 A1 WO2023153034 A1 WO 2023153034A1
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WIPO (PCT)
Prior art keywords
press
forming
molding
shoulder
molded product
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PCT/JP2022/041902
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English (en)
Japanese (ja)
Inventor
隼佑 飛田
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Ｊｆｅスチール株式会社
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Publication of WO2023153034A1 publication Critical patent/WO2023153034A1/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
    • 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
    • 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
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses

Definitions

  • the present invention is a press-forming method for forming a press-formed part having a top portion, a side wall portion, and a flange portion. ) methods and methods for manufacturing press-formed products.
  • the present invention relates to a press-molding method and a method of manufacturing a press-molded product for suppressing the occurrence of wrinkles associated with shrink flange forming when forming the press-molded product.
  • high-strength steel sheets of 590 MPa class or higher high-strength steel sheets
  • high-tensile materials also called high-tensile steel sheet
  • automotive parts have a top plate portion, a vertical wall portion, and a flange portion, such as A pillar upper, A pillar lower, and bumper parts.
  • a top plate portion such as A pillar upper, A pillar lower, and bumper parts.
  • I have parts.
  • the outer peripheral edge of the top plate part or a part of it is curved outwardly in a convex shape (convex), during press molding
  • the vertical walls and flanges of the portion are shrink-flanged, and wrinkles may occur at the ends of the flanges.
  • the increase in strength makes them more susceptible to buckling and wrinkles.
  • Patent Document 1 a top plate portion and a slanted wall portion without a flange at the tip that is continuous with at least one side of the top plate portion are provided, and the entire or part of the slanted wall portion is flat.
  • a press molding method that suppresses wrinkles is described. Specifically, in this method, a part on the end side of the blank sheet corresponding to the oblique wall part is held between a die and a punch during molding, and the part on the end side is held.
  • a top plate portion and a flange portion have a hat-shaped cross section that is continuous in the width direction via a side wall, and the top plate portion and the flange
  • a stepped drawing process is performed by setting a wrinkle holding region where the metal plate is held by a blank holder to the outer peripheral portion rather than the flange position and forming by stepped drawing.
  • the slanted wall portion is formed in a state in which a portion of the blank material on the end side of the portion corresponding to the slanted wall portion is sandwiched between the die and the punch. It is necessary to trim (trimming) the part sandwiched by the next step. Furthermore, there is also a problem that the press-molding method described in Patent Document 1 cannot be applied to molding of a press-molded product having a flange portion continuous to a vertical wall portion (slanted wall portion).
  • the method for manufacturing a press-formed product described in Patent Document 2 can be applied to the forming of a press-formed product having a flange portion. ) cannot be applied to press molding.
  • the present invention has been made to solve the above problems, and its object is to sufficiently suppress wrinkles in the flange portion caused by shrink flange forming without requiring a trimming process after press forming, and to prevent bending.
  • An object of the present invention is to provide a press molding method applicable to molding and a method for manufacturing a press molded product.
  • a press molding method includes a top plate portion having a convex outer peripheral edge portion whose outer peripheral edge or a part thereof is convexly curved outward, and a punch shoulder R portion on the top plate portion.
  • the first forming step may apply drawing or bending, and the second forming step may apply bending.
  • the metal plate is preferably a steel plate having a tensile strength of 590 MPa or higher.
  • a method for manufacturing a press-formed product according to the present invention includes a top plate portion having a convex outer peripheral edge portion in which an outer peripheral edge or a part of the outer peripheral edge is convexly curved outward, and a punch shoulder R portion on the top plate portion.
  • the bending radius of the die shoulder R portion formed corresponding to the convex outer peripheral edge portion of the top plate portion is formed so as to be larger than the bending radius of the die shoulder R portion of the press-formed product of the target shape.
  • the present invention includes a first forming step of forming a metal plate into an intermediate formed product, and a second forming step of forming the intermediate formed product into a press-formed product having a target shape.
  • FIG. 1 is an explanatory diagram of a press molding method according to one embodiment of the present invention.
  • 2A and 2B are explanatory diagrams of parts (target shapes) targeted in the embodiment, FIG. 2(a) being a perspective view and FIG. 2(b) being a plan view.
  • FIG. 3 is a diagram (FIG. 3(a)) showing the state of the bottom dead center of molding when the target shape is molded by the method of the conventional example, and an intermediate molded product in the first molding step of the embodiment.
  • FIG. 3B is a diagram showing the state of the molding bottom dead center when molding the .
  • FIG. 4 is a plan view showing the outer peripheral lines of the bottom dead center molded into the target shape of FIG.
  • FIG. 5 is an explanatory diagram of the second molding process according to the embodiment.
  • FIG. 6 is a diagram showing the thickness increase rate distribution of the intermediate molded product press-molded in the first molding step.
  • FIG. 7 is a diagram showing the plate thickness increase rate distribution of the press-formed product press-formed into the target shape in the second forming step.
  • FIG. 8 is a diagram comparing the plate thickness increase rate distribution of the intermediate formed product of FIG. 6 and the plate thickness increase rate distribution of the press-formed product press-formed into the target shape of FIG. 7 .
  • 9A and 9B are diagrams for explaining problems when the part shown in FIG. 2 is press-molded by a conventional method.
  • FIG. 2 shows a part of the press-molded product.
  • the press-formed product 1 shown in FIG. 2 has a top plate portion 3, a vertical wall portion 5, and a flange portion 7, and a portion of the outer peripheral edge of the top plate portion 3 protrudes outward. It has a curved portion (hereinafter referred to as “convex outer peripheral edge portion 3a”).
  • the boundary between the convex outer peripheral edge portion 3a and other parts is, for example, up to the curved end of the convex outer peripheral edge portion 3a when the top plate portion 3 is viewed from above.
  • the boundary portion between the top plate portion 3 and the vertical wall portion 5 has an R shape corresponding to the shape of the shoulder portion of the punch used for press molding
  • the term "punch shoulder R "part” indicates the corresponding part on the press-formed product 1 side.
  • the boundary between the vertical wall portion 5 and the flange portion 7 has an R shape corresponding to the shape of the shoulder portion of the die. point to the part.
  • FIG. 9 shows the result of FEM analysis of the case where the press-formed product 1 is press-formed by the conventional method, and shows the distribution of the plate thickness increase rate by shades of color.
  • the plate thickness increase rate is obtained by obtaining the difference (thickness increment) between the plate thickness of the press-formed product after press-forming and the plate thickness of the blank before press-forming, and the ratio (ratio) to the thickness of the blank. , and the larger the value, the greater the plate thickness.
  • the press forming method of the present embodiment is designed to reduce the occurrence of wrinkles in the flange portion 7 as compared with the conventional method and to apply bending forming.
  • the press molding method according to the present embodiment has a convex outer peripheral edge portion 3a in which a part of the outer peripheral edge is convexly curved outward, as shown in FIG.
  • a press-formed product 1 having a top plate portion 3, a vertical wall portion 5 continuous with the top plate portion 3 via a punch shoulder R portion, and a flange portion 7 continuous with the vertical wall portion 5 via a die shoulder R portion. It is a method of molding.
  • the press molding method according to the present embodiment includes a first molding step of molding a blank 13, which is a metal plate, into an intermediate molded product 17, and a pressing step of molding the intermediate molded product 17 into a target shape.
  • FIG. 1 shows the state before molding of the portion corresponding to the AA' section of FIG. 2(b) in each step. Since the press-molded product 1 is manufactured by executing the press-molding method, the invention of the press-molding method can be configured as the invention of the method of manufacturing the press-molded product. Therefore, the embodiment of the press-molding method described below is common to the embodiment of the method of manufacturing a press-molded product. Each step will be described in detail below.
  • the first molding step is a step of press-molding the blank 13, which is a metal plate, into an intermediate molded product 17 described below.
  • the shape of the die shoulder R portion at the boundary between the vertical wall portion 5 and the flange portion 7 formed by shrink flange forming is different from the target shape. This point will be specifically described below.
  • a die 15 is moved relative to the punch 9 while part of the blank 13 is sandwiched between the upper surface of the punch 9 and a pad 11. and the intermediate molded product 17 is molded.
  • the forming surface portion of the die 15 has a shape corresponding to the target shape except for the shoulder portion 15a .
  • the curvature radius of 21a is larger than R 0 (R 0 ⁇ R 1 ).
  • FIG. 3 shows an example of the shape of the intermediate molded product 17 according to the present invention when the first molding step is performed using the mold as described above.
  • FIG. 3(a) shows the state of the molding bottom dead center of the portion corresponding to the AA' section when the target shape of FIG. 2 is molded by the conventional method.
  • FIG. 3(b) shows the state of the molding bottom dead center of the portion corresponding to the AA' cross section when the intermediate molded product 17 is molded in the first molding step of the present embodiment.
  • the conventional mold shown in FIG. 3A has the same shape as the mold used in the second molding step shown in FIG. Also, in FIGS. 3(a) and 3(b), illustration of the die is omitted.
  • the boundary between the top plate portion 3 and the vertical wall portion 5 in the target shape and the intermediate molded product 17 is the shoulder portion 19a of the punch 19 or the shoulder portion 9a of the punch 9. It is a portion that becomes an R shape along the . Therefore, this portion of the target shape and intermediate molded product 17 is called a punch shoulder R portion 23 .
  • the boundary portion between the vertical wall portion 5 and the flange portion 7 is a portion that forms an R shape along the shoulder portion 21a of the die 21 or the shoulder portion 15a (see FIG. 1) of the die 15, the target shape and the intermediate forming This portion of the product 17 is called a die shoulder R portion 25 .
  • the first molding step by using the mold shown in FIG.
  • the bending radius of the die shoulder R portion 25 of the target shape is R4 mm
  • the bending radius of the die shoulder R portion 25 of the intermediate molded product 17 is R10 mm.
  • the distance a from the R stop of the punch shoulder R portion 23 of the intermediate molded product 17 on the side of the vertical wall portion 5 to the blank end at the bottom dead center of the molding is longer than the distance a of the target shape.
  • the distance a of the target shape in FIG. 3(a) is 7.3 mm
  • the distance a of the intermediate molded product 17 in FIG. 3(b) is 9.5 mm, which is 2.2 mm longer.
  • FIG. 4 shows a comparison of the target shape of FIG. 3(a) and the shape of the intermediate molded product 17 of FIG. 3(b) in plan view.
  • FIG. 4 shows the outer peripheral lines when the target shape and the intermediate molded product 17 are overlapped with the top plate portion 3 aligned.
  • FIG. 4 as in FIG. 3, it can be seen that the end portion of the flange portion 7 of the intermediate molded product 17 (invention example) is positioned about 2.2 mm outside the target shape (conventional example).
  • the amount of deformation of the vertical wall portion 5 and the flange portion 7 becomes smaller than the target shape. Wrinkles due to shrink flanging are less likely to occur at this portion.
  • the bending radius of the die shoulder R portion 25 of the intermediate molded product 17 is made larger than the bending radius of the die shoulder R portion 25 of the target shape because the total length of the die shoulder R portion 25 (the total length of the ridgeline of the vertical wall portion 5 and the flange portion 7) ), or only the portion to be shrink-flanged. That is, the bending radius of the die shoulder R portion 25 of the portion formed continuously with the vertical wall portion 5 corresponding to at least the convex outer peripheral edge portion 3a in the intermediate molded product 17 is the bending radius of the die shoulder R portion 25 of the target shape. It should be bigger.
  • the bending radius of the die shoulder R portion 25 of the intermediate molded product 17 is preferably 1.2 to 5 times the bending radius of the die shoulder R portion 25 of the target shape. Furthermore, it is even better if it is increased from 1.2 times to 3 times. This is for optimizing the gap between the punch 19 and the die 21 at the start of shrink flange forming in the second forming step, which will be described later.
  • the second forming step is a step of forming the intermediate formed product 17 formed in the first forming step into the press-formed product 1 having the target shape.
  • the punch 19 and the die 21 used in the second molding process are the same as the punch 9 and the die 15 used in the first molding process except for the molding portion of the die shoulder R portion 25. have the same shape. Therefore, this process also serves as a "restrike" to reduce springback by re-pressing the molded product with the same mold.
  • the punch shoulder R portion 23 of the intermediate molded product 17 is set so as to match the shoulder portion 19a of the punch 19, and the punch 19 and the pad 11 are used to form the intermediate molded product 17.
  • the die 21 is lowered while the top plate portion 3 is held, and the press-formed product 1 having the target shape is formed.
  • the die 21 has a shape corresponding to the target shape, and as described above, the curvature radius R0 of the shoulder portion 21a of the die 21 is equal to the curvature radius R1 of the shoulder portion 15a of the die 15 used in the first forming step. less than ( R0 ⁇ R1 ).
  • FIG. 5 shows changes in the appearance of the die shoulder R portion 25 during the forming process of the second forming step, and the state of the forming process of the portion corresponding to the AA' section of FIG.
  • Numerical values such as "5 mmup” are distances up to the bottom dead center of molding of the die 21 in consideration of the sheet thickness of the intermediate molded product 17 . Therefore, the gap between the punch 19 and the die 21 in the press forming direction when "5 mmup" is the plate thickness of the intermediate product 17 +5 mm. As the numerical value becomes smaller, the die 21 moves closer to the punch 19 and the molding progresses, and at "0mmup", the molding bottom dead center is reached.
  • the die shoulder R portion 25 began to be formed.
  • the portion is subjected to shrink flange forming.
  • the gap becomes smaller until the bottom dead center of the molding, so it is difficult for the material to concentrate locally. Therefore, wrinkles are less likely to occur at the end of the flange portion 7 in the second forming step as well.
  • FIG. 6 shows the distribution of the plate thickness increase rate of the intermediate molded product 17 molded in the first molding step of the present embodiment. Note that the plate thickness increase rate and color gradation are the same as in FIG. As shown in FIG. 6, the maximum plate thickness increase rate of the conventional example in FIG. We were able to halve the increase in sheet thickness at the area where shrinkage flange forming occurs.
  • FIG. 7 shows the distribution of the plate thickness increase rate when the intermediate molded product 17 of FIG. 6 is molded into the target shape in the second molding process.
  • the maximum plate thickness increase rate after the second forming process in the present embodiment was +7.3%, which was only 0.8% higher than the maximum plate thickness increase rate of the intermediate molded product 17.
  • the press-formed product 1 manufactured by the press-forming method of the present embodiment has a more shrink-flange-formed portion than the press-formed product 1 press-formed by the conventional method. It can be seen that the increase in the thickness of the plate can be sufficiently reduced, and the occurrence of wrinkles at the part can be suppressed.
  • FIG. 8(a) shows the distribution of the plate thickness increase rate of the intermediate molded product 17 at the molding bottom dead center in the first molding step.
  • FIG. 8(b) shows the distribution of the plate thickness increase rate of the press-formed product 1 at the forming bottom dead center in the second forming step. The distribution of plate thickness increase rate is shown in a range smaller than that in FIGS.
  • the increase in plate thickness is dispersed over a wider range than in the first forming process. This indicates that the strain in the shrink flange forming in the second forming step is distributed over a wide range, thereby preventing a local increase in plate thickness and suppressing the occurrence of wrinkles.
  • the trimming process is not essential unlike the conventional example shown in Patent Document 1.
  • the press forming method of the present embodiment can suppress wrinkles in the flange portion 7 without using a wrinkle suppressor, and therefore can be applied to press forming by bending (form) forming. That is, it is particularly effective when drawing or bending is applied in the first forming step for forming the intermediate product 17 and bending is applied in the second forming step for forming the target shape.
  • the press forming method of the present embodiment is particularly effective when using a high-strength steel sheet that tends to wrinkle due to shrink flange forming.
  • the metal plate (blank) may be a steel plate having a tensile strength of 590 MPa or more, and even in this case, a sufficient effect of reducing wrinkles can be obtained.
  • the effect of suppressing shrinkage flanging wrinkles in the press forming method of the present invention was specifically examined using FEM analysis, and the results are described below.
  • a steel sheet having a thickness of 1.0 mm and a tensile strength of 980 MPa was used as a blank, and the press-formed product 1 shown in FIG.
  • the bending radius of the die shoulder R portion 25 of the target shape was set to 4 mm.
  • FEM analysis was performed on a conventional example in which a metal plate is formed into a target shape in one process and an example of the present invention in which a metal plate is formed into a target shape in two processes, and the maximum plate thickness increase rate at the shrink flange forming portion was obtained.
  • a plurality of examples of the present invention were carried out by changing the bending radius of the die shoulder R portion 25 of the intermediate molded product 17 . Table 1 shows the results.
  • No. 1 is a conventional example that directly forms a target shape from a metal plate in one process.
  • No. 2 to No. 5 are the first step of forming the metal plate into the intermediate molded product 17 (first forming step of the embodiment), the second step of molding the intermediate molded product 17 into the target shape (embodiment This is an example of the present invention carried out in two steps, the second molding step of (2).
  • the bending radius of the die shoulder R portion 25 of the intermediate molded product 17 was changed to four patterns of 6 mm, 8 mm, 10 mm and 12 mm.
  • the maximum plate thickness increase rate of press-formed product 1 was 12.5%.
  • the maximum plate thickness increase rate in the first step is 7.4%
  • the maximum plate thickness increase in the second step is 7.4%.
  • the rate of increase in plate thickness was 8.2%
  • the plate thickness increase rate was reduced compared to No. 1, the conventional example.
  • Example No. 3 of the present invention in which the bending radius of the die shoulder R portion 25 in the first process is 8 mm, the maximum thickness increase rate in the first process is 7.4%, and the maximum thickness increase rate in the second process is 7.4%. was 8.2%, and the plate thickness increase rate could be reduced similarly to No.2.
  • Example No. 4 of the present invention in which the bending radius of the die shoulder R portion 25 in the first process is 10 mm, the maximum thickness increase rate in the first process is 6.5%, and the maximum thickness increase rate in the second process is 6.5%. It was 7.3%, and the plate thickness increase rate could be further reduced than No.2 and No.3.
  • Example No. 5 of the present invention in which the bending radius of the die shoulder R portion 25 in the first process is 12 mm, the maximum plate thickness increase rate in the first process is 5.2%, which is even lower than the other invention examples.
  • the maximum plate thickness increase rate in the second step was 8.9%, which was lower than that of the conventional example, but higher than that of the other invention examples. Therefore, in this example, it was found that Example No. 4 was able to reduce the plate thickness increase rate the most.
  • the plate thickness in the first forming step is reduced, but on the other hand, the plate thickness tends to increase in the second forming step. .
  • the larger the bending radius of the die shoulder R of the intermediate product is, the earlier the forming of the die shoulder R is started in the second forming step.
  • the effect of suppressing wrinkles is lowered due to the increase in Therefore, if the bending radius of the die shoulder R portion of the intermediate product is too large, the forming of the die shoulder R portion is started before the gap between the punch and the die becomes sufficiently small in the second forming step, resulting in local deformation of the material. Concentration may be difficult to control. For this reason, it is preferable to set the bending radius of the die shoulder R portion of the intermediate molded product so that a well-balanced wrinkle suppressing effect can be obtained in both the first molding process and the second molding process.
  • a press-forming method and a press-formed product that can be applied to bending forming by sufficiently suppressing wrinkles in the flange portion caused by shrink flange forming without requiring a trimming process after press forming. can provide a method.

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

Abstract

Ce procédé de moulage à la presse et le procédé de fabrication d'un article moulé à la presse destinés au moulage d'un article moulé à la presse (1) comprennent une section de plaque supérieure (3) qui a une section de bord périphérique externe convexe (3a) où un bord périphérique externe ou une partie de celui-ci est incurvé de manière convexe vers l'extérieur ; une section de paroi verticale (5) qui est continue avec la section de plaque supérieure (3) par l'intermédiaire d'une section d'épaulement de poinçon R (23) ; et une section de bride (7) qui est continue avec la section de paroi verticale (5) par l'intermédiaire d'une section d'épaulement de matrice R (25), lesdits procédés comprenant une première étape de moulage dans laquelle une plaque métallique est moulée en un article moulé intermédiaire (17), et une seconde étape de moulage dans laquelle l'article moulé intermédiaire (17) moulé lors de la première étape de moulage est moulé en un article moulé à la presse (1) d'une forme cible, et durant la première étape de moulage, le moulage est effectué de telle sorte que le rayon de courbure de la section d'épaulement de matrice R (25,) qui est formé de façon à correspondre à au moins la section de bord périphérique externe convexe de la section de plaque supérieure (3) de l'article moulé intermédiaire (17), est supérieur au rayon de courbure de la section d'épaulement de matrice R (25) de l'article moulé à la presse (1) de la forme cible.
PCT/JP2022/041902 2022-02-10 2022-11-10 Procédé de moulage à la presse et procédé de fabrication d'un article moulé à la presse WO2023153034A1 (fr)

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JP2022019456 2022-02-10
JP2022-019456 2022-02-10
JP2022150820A JP7239048B1 (ja) 2022-02-10 2022-09-22 プレス成形方法及びプレス成形品の製造方法
JP2022-150820 2022-09-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017047601A1 (fr) * 2015-09-18 2017-03-23 新日鐵住金株式会社 Article moulé en forme de panneau et procédé de production associé
JP6870674B2 (ja) * 2018-11-16 2021-05-12 Ｊｆｅスチール株式会社 プレス成形方法
WO2021141104A1 (fr) * 2020-01-08 2021-07-15 本田技研工業株式会社 Procédé de formage à la presse
JP2021178339A (ja) * 2020-05-12 2021-11-18 日伸工業株式会社 プレス加工品の製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017047601A1 (fr) * 2015-09-18 2017-03-23 新日鐵住金株式会社 Article moulé en forme de panneau et procédé de production associé
JP6870674B2 (ja) * 2018-11-16 2021-05-12 Ｊｆｅスチール株式会社 プレス成形方法
WO2021141104A1 (fr) * 2020-01-08 2021-07-15 本田技研工業株式会社 Procédé de formage à la presse
JP2021178339A (ja) * 2020-05-12 2021-11-18 日伸工業株式会社 プレス加工品の製造方法

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