US20210379639A1 - Press formed component and method for manufacturing same - Google Patents

Press formed component and method for manufacturing same Download PDF

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Publication number
US20210379639A1
US20210379639A1 US17/288,117 US201917288117A US2021379639A1 US 20210379639 A1 US20210379639 A1 US 20210379639A1 US 201917288117 A US201917288117 A US 201917288117A US 2021379639 A1 US2021379639 A1 US 2021379639A1
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United States
Prior art keywords
vertical wall
wall portion
top sheet
curved
shape
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Pending
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US17/288,117
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English (en)
Inventor
Hiroto Miyake
Toyohisa Shinmiya
Yuji Yamasaki
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JFE Steel Corp
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JFE Steel Corp
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Assigned to JFE STEEL CORPORATION reassignment JFE STEEL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YAMASAKI, YUJI, MIYAKE, HIROTO, SHINMIYA, TOYOHISA
Publication of US20210379639A1 publication Critical patent/US20210379639A1/en
Pending legal-status Critical Current

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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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
    • 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
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
    • B21D43/02—Advancing work in relation to the stroke of the die or tool
    • B21D43/04—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work
    • B21D43/05—Advancing work in relation to the stroke of the die or tool by means in mechanical engagement with the work specially adapted for multi-stage presses
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards

Definitions

  • the present invention relates to a press formed component including a portion having an L-shape, a T-shape, or the like in a plan view, which is used as, for example, a skeleton component of an automobile, and to a method for manufacturing the same.
  • the component L-shaped or T-shaped in a plan view includes a curved portion in which a boundary portion between a top sheet portion and a vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction.
  • a front pillar, a center pillar, or the like which is a vehicle body skeleton component of an automobile, is a product usually including an L-shaped or T-shaped portion in a plan view.
  • drawing forming drawing
  • bending forming bending
  • Drawing forming is usually performed using a die composed of a die, a punch, and a blank holder (wrinkle presser).
  • a metal sheet is subjected to drawing by, for example, reducing a distance between the punch and the die while pressing a periphery of the metal sheet by the die and the blank holder.
  • Adopting drawing forming is likely to cause cracking and wrinkling when press forming an L-shaped or T-shaped component.
  • high tensile strength steel sheets tend to be often applied as materials of press formed components in order to achieve safety improvement and weight reduction in automobile vehicle bodies.
  • Such high-strength metal sheets cannot be expected to have as much ductility as mild steel sheets, so that the difficulty of performing drawing forming while suppressing cracking is higher.
  • drawing forming after drawing forming is performed while pressing the periphery of a metal sheet by a blank holder, an excess part of the metal sheet is trimmed to obtain a formed component. Due to that, drawing forming requires use of a metal sheet having a larger area than an area to be the formed component, which reduces yield.
  • bending forming is usually performed using a die composed of a punch, a pad, and a die.
  • bending forming for example, bending using the die is performed on a metal sheet while sandwiching the metal sheet by the punch and the pad. Since bending forming does not use a blank holder, yield is higher as compared with drawing forming. In addition, bending forming is generally more advantageous against cracking than drawing forming. However, in bending forming, the metal sheet is not pressed by a blank holder, so that wrinkles are more likely to occur than in drawing forming.
  • PTL 1 describes a press forming method for an automobile skeleton component including a top sheet portion, a vertical wall portion continuous thereto, and a flange portion and having a shape curved in an L-shape.
  • a metal sheet having a shape such that an end of a part of the metal sheet corresponding to a lower side of the L-shape is within the top sheet portion is placed on a die, and the top sheet portion is pressed by a pad to suppress out-of-plane deformation or buckling of the metal sheet.
  • conditions that no body wrinkles occur on a vertical wall portion are indicated by limiting a component shape, including an angle between a vertical wall curved portion and a direction orthogonal to a flange portion, a length from an inner edge of a flange surface to a central part of a shock mark generated in the vertical wall curved portion, and a central angle of a curved fan shape on a horizontal plane of the vertical wall curved portion.
  • Performing press forming under the condition described in PTL 1 can suppress cracking in the flange portion and wrinkling on the top sheet portion in the portion curved inward in a plan view (also referred to as curved inner side) in the L-shape.
  • wrinkles occur on the vertical wall portion on the curved inner side depending on the shape of the press formed component. The occurrence of wrinkles spoils the appearance of a product or can cause a defect during welding with another component at the position of the vertical wall portion.
  • a body wrinkle countermeasure technology described in PTL 2 is effective for a press formed component including a top sheet surface, a vertical wall portion continuous to the top sheet surface, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary between the top sheet surface and the vertical wall portion is displaced to the vertical wall portion side and curved convexly toward a longitudinal direction.
  • the form of occurrence of the wrinkles assumed in the description of PTL 2 is different from that of wrinkles occurring on a vertical wall portion in an L-shaped or T-shaped press formed component including a top sheet surface, the vertical wall portion continuous to the top sheet surface, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary between the top sheet surface and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction, as is often seen in automobile skeleton components.
  • aspects of the present invention have been made in view of the above problems, and it is an object according to aspects of the present invention to provide a press formed component capable of suppressing wrinkling on a vertical wall portion of a curved portion in a component shape having an L-shape, a T-shape, or the like when viewed in a plan view and a method for manufacturing the same.
  • an aspect of the present invention is a press formed component including a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction, in which, in a cross-sectional shape of the curved portion, an inclination angle ⁇ [deg] of the vertical wall portion with respect to the top sheet portion satisfies expression (1) below:
  • a press formed component including a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction, in which when, in a cross-sectional shape, a height of the vertical wall portion is defined as H [mm], an inclination angle of the vertical wall portion with respect to the top sheet portion as ⁇ [deg], a curvature radius at the boundary portion between the top sheet portion and the vertical wall portion as Rp [mm], a curvature radius at a boundary portion between the vertical wall portion and the flange portion as Rd [mm], and a curvature radius of the curved portion in the plan view as r [mm], the inclination angle ⁇ of the vertical wall portion in the curved portion satisfies expression (2) below,
  • a press formed component including a top sheet portion, a vertical wall portion continuous to the top sheet portion, and a flange portion and also including a curved portion in which when viewed in a plan view, at least a part of a boundary portion between the top sheet portion and the vertical wall portion is displaced to the vertical wall portion side and curved concavely toward a longitudinal direction, in which when, in a cross-sectional shape, a height of the vertical wall portion is defined as H [mm], an inclination angle of the vertical wall portion with respect to the top sheet portion as ⁇ [deg], a curvature radius at the boundary portion between the top sheet portion and the vertical wall portion as Rp [mm], a curvature radius at a boundary portion between the vertical wall portion and the flange portion as Rd [mm], and a curvature radius of the curved portion at the boundary portion between the top sheet portion and the vertical wall portion in the plan view as r [mm], the inclination angle ⁇ of the vertical wall
  • the press formed component according to each aspect of the present invention may be manufactured by, for example, bending forming or drawing forming.
  • a press formed component capable of suppressing the occurrence of wrinkles on the vertical wall portion of the curved portion in the component shape having an L-shape, a T-shape, or the like when viewed in the plan view.
  • FIG. 1 is a diagram illustrating an example of a press formed component shape according to an embodiment based on the present invention
  • FIG. 2 is a diagram illustrating another example of the press formed component shape
  • FIG. 3 is a diagram illustrating shape parameters in a cross-sectional shape of a cross section taken along line A-A′ of FIG. 1 ;
  • FIG. 4 is a diagram illustrating a shape parameter in a plan view
  • FIG. 5 is a diagram illustrating deformations in a curved portion during forming
  • FIG. 6 is a schematic diagram illustrating movement of a material during forming
  • FIG. 7 is a diagram illustrating a region where shear deformation occurs in a vertical wall portion during forming
  • FIG. 8 is a diagram illustrating elongation deformation in a flange portion during forming
  • FIG. 9 is a diagram illustrating changes in a material flow due to a relationship between a curvature radius of a boundary portion between a top sheet portion and the vertical wall portion and a curvature radius of a boundary portion between the vertical wall portion and the flange portion;
  • FIG. 10 is a diagram illustrating regions with and without occurrence of wrinkles
  • FIG. 11 is a diagram illustrating an example of a die
  • FIG. 12 is a diagram illustrating a press formed component shape in an Example.
  • FIG. 13 is a diagram illustrating the structure of a die used in the Example.
  • the present embodiment targets a press formed component 20 having a component shape including a top sheet portion 1 , a vertical wall portion 2 continuous to the top sheet portion 1 , and a flange portion 3 and also including a curved portion 4 in which when viewed in a plan view, at least a part of a boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 is displaced to the vertical wall portion 2 side and curved concavely toward a longitudinal direction.
  • a press formed component 20 is, for example, a component having an L-shape or a T-shape in a plan view.
  • the phrase “being displaced to the vertical wall portion 2 side and curved concavely toward the longitudinal direction” means that the boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 is curved in such a manner that a curvature radius as viewed from the vertical wall portion 2 side along the longitudinal direction is smaller.
  • a component shape of the press formed component 20 including the curved portion 4 in which the at least a part is displaced to the vertical wall portion 2 side and curved concavely toward the longitudinal direction is referred to also as a curve-containing component shape 10 .
  • the press formed component will be mainly described by exemplifying the curve-containing component shape 10 having an L-shape in a plan view, as illustrated in FIG. 1 .
  • the component shape including the curved portion 4 (a left side portion in FIG. 1 ) formed in such a manner that, when viewed in a plan view, one widthwise side of the top sheet portion 1 is curved so as to project to the vertical wall portion 2 side toward a longitudinal end is an example of the curve-containing component shape 10 .
  • curve-containing component shape 10 to which the present embodiment is applicable may be a component shape curved in a T-shape when viewed in a plan view, as illustrated in FIG. 2 .
  • the example of FIG. 2 is an example in which both widthwise ends of the top sheet portion 1 are curved so as to project in the widthwise direction to form the curved portion 4 on each side individually.
  • the present embodiment is also applicable even to a component shape in which the vertical wall portion 2 is formed only on one widthwise side of the top sheet portion 1 .
  • the present inventors conducted intensive and extensive studies about shape conditions of the press formed component 20 capable of suppressing the occurrence of wrinkles on a vertical wall portion 2 A of the curved portion 4 even when bending forming a metal sheet used as a material into the curve-containing component shape 10 including the curved portion 4 .
  • bending forming is usually performed using a die composed of a die, a punch, and a pad.
  • the geometric elements that determine the shape of the curved portion 4 are a height of the vertical wall portion 2 A, an angle between the top sheet portion 1 and the vertical wall portion 2 A, a curvature radius of a fillet at the boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 A, a curvature radius of a fillet at a boundary portion 6 between the vertical wall portion 2 A and the flange portion 3 , and a curvature radius of the curved portion 4 on an L-shaped inner side in a plan view.
  • the height of the vertical wall portion 2 A is defined as H [mm]
  • Rd [mm] the curvature radius of the fillet at the boundary portion 6 between the vertical wall portion 2 A and the flange portion 3
  • the curvature radius of the curved portion 4 at the boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 A in a plan view is defined as r [mm].
  • These variables are shape parameters that define the shape of the curved portion 4 of the press formed component 20 .
  • the inclination angle ⁇ of the vertical wall portion 2 A with respect to the top sheet portion 1 is, when assuming that a direction orthogonal to the top sheet portion 1 is 0 degrees, an increase in angle in a direction in which the vertical wall portion 2 A is opened with respect to the top sheet portion 1 from 0 degrees.
  • the inclination angle ⁇ is an angle obtained by subtracting 90 degrees from an obtuse angle formed by the top sheet portion land the vertical wall portion 2 A on aback surface side.
  • the curvature radius of the curve of the curved portion 4 may not be constant. In that case, for example, an average value of curvature radii of the curved portion 4 , a curvature radius of a longitudinal central part of the curved portion 4 , a minimum value of the curvature radii of the curved portion 4 , or the like may be adopted as the curvature radius of the curved portion 4 .
  • the shape of the curved portion 4 in the press formed component 20 of the present embodiment is classified into three kinds of shape conditions as below according to a value of “(1 ⁇ sin ⁇ )/cos ⁇ ”.
  • the shape condition of a first press formed component of the present embodiment is a condition that the inclination angle ⁇ in the curved portion 4 satisfies expression (1) below:
  • shape condition of a second press formed component of the present embodiment is a condition that the inclination angle ⁇ in the curved portion 4 satisfies expression (2) below and further satisfies condition A or condition B below:
  • shape condition of a third press formed component of the present embodiment is a condition that the inclination angle ⁇ in the curved portion 4 satisfies expression (6) below and further satisfies condition C or condition D below:
  • a region where shear deformation occurs in the vertical wall portions 2 B adjacent to the vertical wall portion 2 A of the curved portion 4 is a region in contact with the die 30 in a region to be the vertical wall portion 2 in a metal sheet 11 .
  • a ratio (shear deformation ratio: SDR) of a length of the region in contact with the die 30 in the region to be formed as the vertical wall portion 2 can be defined as expression (10) below using the inclination angle ⁇ , which is one of the shape parameters.
  • a portion to be the flange portion 3 of the curved portion 4 needs to be elongated, as illustrated in FIG. 8 .
  • expression (11) below is defined as an index value Elongation index (Eindx) of elongation deformation that acts on the region of the metal sheet 11 to be the flange portion 3 of the curved portion 4 .
  • a magnitude of the tensile deformation that occurs on the flange portion 3 of the curved portion 4 varies depending on a magnitude relationship between the curvature radius Rp of the fillet formed by the boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 A and the curvature radius Rd of the fillet at the boundary portion 6 between the vertical wall portion 2 A and the flange portion 3 .
  • Rd>Rp a resistance of the material passing through the fillet at the boundary portion 6 between the surface of the vertical wall portion 2 and the flange portion 3 becomes relatively smaller, so that the material easily flows in from the flange portion 3 side.
  • threshold values for determining the shape of the press formed component 20 in each expression under the geometric conditions of the shape of the press formed component 20 described above were determined from forming results as to whether or not wrinkles occurred on the vertical wall portion 2 A of the curved portion 4 in a plurality of kinds of curve-containing component shapes 10 obtained by bending forming.
  • FIG. 10 illustrates the forming results.
  • FIG. 10 summarizes each of the cases of Rd>Rp and Rd ⁇ Rp by using the SDR and the Eindx as two parameters. Note that in FIG. 10 , conditions with the occurrence of wrinkles were plotted as “X”, and conditions without the occurrence of wrinkles were plotted as “ ⁇ ”.
  • the metal sheet 11 to be used as material has a shape of the formed component shape unfolded.
  • the metal sheet 11 having an area larger than an area required for the component shape may be used as the material for press forming.
  • the metal sheet 11 suitable as the material is a steel sheet having a tensile strength of from 4400 MPa to 1800 MPa.
  • the shape of the curved portion 4 is defined by using, as the shape parameters, the height H [mm] of the vertical wall portion 2 A, the inclination angle ⁇ [deg] of the vertical wall portion 2 A with respect to the top sheet portion 1 , the curvature radius Rp [mm] of the fillet at the boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 A, the curvature radius Rd [mm] of the fillet at the boundary portion 6 between the vertical wall portion 2 A and the flange portion 3 , and the curvature radius r [mm] of the curved portion 4 at the boundary portion 5 between the top sheet portion 1 and the vertical wall portion 2 A in the plan view.
  • the shape of the press formed component 20 is specified so as to satisfy any of the shape conditions of the first to third press formed components of the present embodiment, thereby manufacturing the formed component by press processing.
  • one shape condition is selected from the shape conditions of the first to third press formed components of the present embodiment. Then, the shape of the curved portion 4 is selected to satisfy the selected shape condition, and thereby the shape of the press formed component 20 is determined.
  • Press forming into the curve-containing component shape 10 as described above is performed by bending forming using a die, for example, illustrated in FIG. 11 .
  • the die illustrated in FIG. 11 is composed of an upper die including the die 30 and the pad 31 and a lower die including the punch 32 . Then, a portion of the metal sheet 11 to be the top sheet portion 1 is sandwiched by the pad 31 and the punch 32 , and in this state, the die 30 is lowered to perform bending forming of the vertical wall portion 2 and the flange portion 3 .
  • the pad 31 is arranged to cover the entire top sheet portion 1 so that the entire top sheet portion 1 is pressed. However, the pad 31 may be configured to press a part of the top sheet portion 1 .
  • press forming into the curve-containing component shape 10 may be performed by manufacturing by drawing forming.
  • a die composed of a die, a punch, and a blank holder (wrinkle presser) may be used for forming.
  • manufacturing may be performed by drawing forming in which the metal sheet 11 is subjected to drawing by reducing a distance between the punch and the die while pressing a periphery of the metal sheet 11 by the die and the blank holder.
  • the metal sheet 11 to be press formed may be a metal sheet that is pre-formed in a previous step.
  • the component formed into the curve-containing component shape 10 by the above-described press forming may be an intermediate component before a final product shape is obtained.
  • simply specifying the shape condition of the press formed component 20 enables suppression of the occurrence of wrinkles on the vertical wall portion 2 A of the curved portion 4 in a component shape having an L-shape, a T-shape, or the like when viewed in a plan view.
  • a 980 MPa-class cold-rolled steel sheet (sheet thickness: 1.4 mm) was used as the material metal sheet, and a component shape having a T-shape as illustrated in FIG. 12 was set as the curve-containing component shape 10 .
  • the component shape includes the curved portion 4 on each widthwise side of the top sheet portion 1 on the left side on the paper in FIG. 12 .
  • Height H of vertical wall portion 60 mm
  • Length f at an outer edge of the flange portion 3 in the curved portion 4 30 mm
  • Die shoulder R (curvature radius Rd at boundary portion 6 ): 8 mm, 12 mm, and 16 mm
  • Curved portion R (curvature radius r of curved portion): 100 mm, 150 mm, and 200 mm
  • the press formed component 20 was subjected to press forming analysis under a condition that bending was performed by a die composed of the die 30 , the pad 31 , and the punch 32 , as illustrated in FIG. 13 .
  • pad pressure was 40 tons, and stroke of the pad 31 was 75 mm.
  • a coefficient of friction between the die and the metal sheet 11 was set constant at 0.12.
  • the SDR value is 0.966, and when the SDR value is larger than 0.95, it is judged to be a condition of good product regardless of the Eindx value and the magnitude relationship between Rd and Rp, i.e., in all geometric shapes. Additionally, even in the analysis results, no wrinkles were observed under all the conditions. Therefore, designing under the condition that the SDR value is larger than 0.95 was shown to enable the press formed component 20 to be manufactured without the occurrence of any wrinkles on the vertical wall portion 2 A of the curved portion 4 . It was thus confirmed that when the shape condition of the first press formed component is satisfied, no wrinkles occur on the vertical wall portion 2 A.
  • the SDR value is 0.885, and it was predicted that depending on the shape of the press formed component 20 , wrinkles will occur on the vertical wall portion 2 A.
  • the Eindx value is 1.38, which is below 1.5, so that it is judged to be a condition of good product regardless of the magnitude relationship between Rd and Rp. Even in the analysis results under the condition, there were observed no wrinkles.
  • the curvature radius of the curved portion 4 was 100 mm and 150 mm, the Eindx values were 2.34 and 1.59, respectively.
  • the curvature radius of the curved portion 4 was 200 mm, the Eindx value was 1.35, which was below 1.4, so that it was judged to be a condition of good product regardless of the magnitude relationship between Rd and Rb.
  • the analysis results also confirmed that there were no wrinkles. Additionally, when the curvature radius of the curved portion 4 is 150 mm, the Eindx value is 1.55, which is not less than 1.4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Body Structure For Vehicles (AREA)
  • Glass Compositions (AREA)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
  • Battery Electrode And Active Subsutance (AREA)
US17/288,117 2018-10-31 2019-06-28 Press formed component and method for manufacturing same Pending US20210379639A1 (en)

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JP2018205495 2018-10-31
JP2018-205495 2018-10-31
PCT/JP2019/025968 WO2020090153A1 (ja) 2018-10-31 2019-06-28 プレス成形部品及びその製造方法

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EP (1) EP3858510A4 (zh)
JP (1) JP6881691B2 (zh)
KR (1) KR102449292B1 (zh)
CN (1) CN112888514B (zh)
MX (1) MX2021004861A (zh)
WO (1) WO2020090153A1 (zh)

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US20180264534A1 (en) * 2014-12-22 2018-09-20 Nippon Steel & Sumitomo Metal Corporation Hat-shaped cross-section component manufacturing method

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EP2644293A1 (en) * 2010-11-24 2013-10-02 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing l-shaped product
US20180264534A1 (en) * 2014-12-22 2018-09-20 Nippon Steel & Sumitomo Metal Corporation Hat-shaped cross-section component manufacturing method

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WO2020090153A1 (ja) 2020-05-07
JP6881691B2 (ja) 2021-06-02
JPWO2020090153A1 (ja) 2021-02-15
MX2021004861A (es) 2021-06-08
CN112888514B (zh) 2023-01-10
KR102449292B1 (ko) 2022-09-29
CN112888514A (zh) 2021-06-01
EP3858510A1 (en) 2021-08-04
KR20210060590A (ko) 2021-05-26

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