WO2022118622A1 - Procédé de production d'un élément en acier - Google Patents

Procédé de production d'un élément en acier Download PDF

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Publication number
WO2022118622A1
WO2022118622A1 PCT/JP2021/041318 JP2021041318W WO2022118622A1 WO 2022118622 A1 WO2022118622 A1 WO 2022118622A1 JP 2021041318 W JP2021041318 W JP 2021041318W WO 2022118622 A1 WO2022118622 A1 WO 2022118622A1
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Prior art keywords
shape
steel
molding
cross
longitudinal direction
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PCT/JP2021/041318
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English (en)
Japanese (ja)
Inventor
寛之 田中
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株式会社神戸製鋼所
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Publication of WO2022118622A1 publication Critical patent/WO2022118622A1/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

Definitions

  • This disclosure relates to a method for manufacturing steel parts.
  • Patent Document 1 describes in a press forming method of forming a metal plate by a relative linear movement of a die and a punch, which shrinks and flanges before the bottom dead point of the press in the final press process.
  • a press forming method of forming a metal plate by a relative linear movement of a die and a punch which shrinks and flanges before the bottom dead point of the press in the final press process.
  • Patent Document 2 is a method for molding a metal member having a U-shaped or hat-shaped cross section and having a shape curved in the longitudinal direction, and includes a curved portion in a region of the metal member in the longitudinal direction.
  • first molding step an intermediate product is molded with the same radius of curvature as the product shape and wider than the product shape, and in the second molding step, the width is smaller than the width in the first molding step.
  • the remaining part other than a part including the curved portion is molded without changing the width of the mold and the radius of curvature in the first molding step and the second molding step. It is shown that the entire molded product has a product shape or a substantially product shape.
  • Patent Document 3 describes a method of molding a metal member having a U-shaped or hat-shaped cross section and having a shape curved in the longitudinal direction, among a plurality of curved portions formed on the metal member.
  • a metal member having a U-shaped or hat-shaped cross section and having a shape curved in the longitudinal direction, among a plurality of curved portions formed on the metal member.
  • an intermediate product is molded with a radius of curvature larger than the product shape
  • the intermediate product is molded to be smaller than the radius of curvature in the first molding step.
  • the remaining part other than the curved part may be molded without changing the radius of curvature of the mold in the first molding step and the second molding step, and the entire molded product may have a product shape or a substantially product shape. It is shown.
  • Patent Document 1 for the purpose of leveling the residual stress of the flange forming portion, an intermediate forming of forming a bead on the stretched flange portion and a forming process of crushing the bead are carried out.
  • this method is a method of controlling the shape of the flange portion, and does not reduce the residual stress generated in the vertical wall portion of the U-shaped or hat-shaped component.
  • Patent Documents 2 and 3 in the first molding step, an intermediate product having a longer line length in the longitudinal direction is formed when viewed from the top view, and then in the second molding step, it is molded into the shape of the final product. By doing so, the residual stress in the longitudinal direction is reduced. However, when the line length in the longitudinal direction is long, the mold may not be set properly in the molding process for obtaining the final shape. Further, Patent Documents 2 and 3 do not manufacture parts having a complicated vertical wall surface, and there is a demand for a means for reducing partial residual stress according to the complicated shape.
  • the present disclosure has been made in view of the above circumstances, and an object thereof is to provide a manufacturing method capable of easily forming steel parts having a complicated shape and high strength with good shape and dimensional accuracy. It is in.
  • Aspect 1 of the present invention is It has a shape curved in the longitudinal direction, and the shape of the cross section perpendicular to the longitudinal direction is U-shaped or hat-shaped, and a stepped portion having a divergent shape toward the opening is formed on the vertical wall portion on the curved concave portion side. It is a method of manufacturing steel parts that has Using a forming material, the line length of the stepped portion in the cross section perpendicular to the longitudinal direction is the same as the steel part in the top view and longer than the steel part in the cross section when compared with the steel part.
  • the first step of manufacturing intermediate parts with a shape Using the intermediate part, the vertical wall portion on the curved concave portion side is molded with a mold having the same shape as the steel part, and the shape of the vertical wall portion on the curved concave portion side of the intermediate part is changed to the vertical wall portion on the curved concave portion side of the steel part. It is a method for manufacturing a steel part, which includes a second step of transforming the shape of a wall portion.
  • Aspect 2 of the present invention is The line length of the stepped portion in the cross section perpendicular to the longitudinal direction of the intermediate part is more than 1.00 times and 1.10 times or less of the line length of the stepped portion in the cross section perpendicular to the longitudinal direction of the steel part.
  • the method for manufacturing a steel part according to the first aspect which is the length of the above.
  • Aspect 3 of the present invention is The method for manufacturing a steel part according to aspect 1 or 2, wherein the steel plate constituting the steel part has a tensile strength of 980 MPa or more.
  • FIG. 5 is an enlarged view of a schematic cross-sectional view of FIG.
  • FIG. 9 is a cross-sectional view taken along the line AA of FIG. It is a process diagram in an Example. It is a schematic cross-sectional view which shows the molding procedure of the 1st step (draw molding) in an Example, A is before molding, B is molding, C is after molding. It is a schematic cross-sectional view which shows the molding procedure of the 2nd step (form molding) in an Example, A is before molding, B is molding, C is after molding.
  • FIG. 1 is a perspective view schematically showing the steel part 1 targeted in the present embodiment.
  • FIG. 2 is a top view schematically showing the steel part 1.
  • the steel part 1 targeted in the present embodiment has a shape curved in the longitudinal direction L1, and the cross section perpendicular to the longitudinal direction is U-shaped or hat-shaped. It has a stepped portion 3 having a divergent shape toward the opening 2.
  • the steel component 1 shown in FIGS. 1 and 2 has a top plate portion 4 and vertical wall portions 5A and 5B, and of the two vertical wall portions, the vertical wall portion 5A on the curved recess side is a stepped portion. It has 3 and a flange portion 6.
  • W indicates the width direction of the steel component 1.
  • a molding material is used, and first, when the line length of the step portion in the cross section perpendicular to the longitudinal direction is compared with the steel part, the steel part and the steel part are viewed from above.
  • the intermediate part may be molded with a mold to have a second step of transforming the shape of the vertical wall portion on the curved concave portion side of the intermediate part into the shape of the vertical wall portion on the curved concave portion side of the steel part.
  • the vertical wall portion of the steel part has a stepped portion, and the line length of the stepped portion in the cross section perpendicular to the longitudinal direction is the same in the top view when the intermediate part and the steel part are compared. Therefore, in the cross-sectional view, the intermediate parts are longer than the steel parts.
  • the same line length means that the line has the same length and position.
  • the steel parts according to this embodiment are different from the members of Patent Document 2 and Patent Document 3.
  • both ends of the line length of the step portion are the same for the steel part and the intermediate part when viewed in cross section, and the line length of the step portion is steel. Intermediate parts are longer than parts.
  • the line length of the step portion means from one end to the other end of the line length constituting the step portion.
  • one concave angle Refers to the portion P1 to the other concave corner portion P2.
  • the concave corner portion has a curvature R as illustrated in FIG.
  • the contact point between the straight line Q1 forming the vertical wall and the cross-sectional line R1 is set as one end P11, and the straight line Q2 forming the vertical wall (flange portion).
  • the contact point of the cross-sectional line R2 is the other end P21, and means from one end P11 to the other end P21.
  • the length of the line length may be changed between these two ends.
  • First step In the first step, a molding material is used, and the line length of the step portion in the cross section perpendicular to the longitudinal direction is the same as that of the steel part in the top view when compared with the steel part, and the cross section is the same. Manufacture intermediate parts that have a longer shape than steel parts.
  • FIG. 4 shows a schematic perspective view of the intermediate parts manufactured in this step
  • FIG. 5A shows a schematic cross-sectional view perpendicular to the longitudinal direction of the intermediate parts
  • FIG. 5B shows a schematic top view of the intermediate parts in the longitudinal direction.
  • the dotted lines shown in FIGS. 4 and 5 indicate the shape of the steel part to be formed in the second step.
  • the line length of the stepped portion in the cross section perpendicular to the longitudinal direction is the same for the intermediate part and the steel part when viewed from above.
  • FIG. 6 is an enlarged schematic view of a cross-sectional view of FIG. 5A.
  • FIG. 6 is also a cross-sectional view of the line length of the stepped portion in the cross section perpendicular to the longitudinal direction.
  • the line length L22 of the stepped portion of the intermediate part is made longer than the line length L21 of the stepped portion of the steel part.
  • the positions of both ends P1 and P2 of the line length constituting the step portion are the same as the positions of both ends P1 and P2 of the line length of the step portion of the steel component.
  • the line length L22 of the stepped portion of the intermediate part into the above-mentioned form
  • the second step when molding with a mold having the shape of a steel part, (the line length L22 of the stepped portion of the intermediate part-the step of the steel part) in the above cross section.
  • the excess line length portion represented by the line length L21) of the portion is crushed and the material tries to spread in the longitudinal direction, but is blocked by the surrounding material and is compressed, and compressive stress is generated.
  • the tensile stress generated in the intermediate part of the first step is canceled by the compressive stress generated in the molding of the second step of the next step, the residual stress is reduced, and the swing caused by the high tensile stress is generated. It is thought to be suppressed.
  • the intermediate part can be formed into the intermediate part in the second step.
  • the wire length constituting the stepped portion of the intermediate component may be a length having a ratio of more than 1.00 to the wire length of the stepped portion of the steel component.
  • the above ratio is preferably 1.10 or less, and more preferably 1. It is 06 or less.
  • the shape of the stepped portion in the cross section of the intermediate part is not particularly limited as long as it preferably satisfies the ratio of the above line lengths and can easily fit the mold of the steel part in the second step.
  • FIG. 7 is an enlargement of a part of FIG. When the shape of the stepped portion in the cross section of the steel part is as shown by the broken line in FIG. 7, for example, the surplus line length can be determined as the line length L22 of the stepped portion of the intermediate part as follows.
  • the angle ⁇ 1 is, for example, 1 degree or more and 10 degrees or less. It can be changed within the range.
  • the angle ⁇ 2 is, for example, 1 degree or more and 10 degrees or less. It can be changed within the range.
  • the angle ⁇ 2 is set within a range in which the angle ⁇ 3 formed by the bottom surface and the vertical wall surface B2 does not exceed 90 degrees from the viewpoint of easily fitting the molds of the steel parts and forming them well.
  • FIGS. 4 and 5 used for explaining the manufacturing method of the present embodiment, an example in which the cross section is the above-described embodiment is given over the entire area in the longitudinal direction, but the present invention is not limited to this, and the cross section is not limited to this, and is one place or intermittent in the longitudinal direction.
  • the cross section can be in the above-mentioned form at a plurality of locations. According to the present disclosure, by making the cross section of the portion to which the compressive stress is desired to be applied in the longitudinal direction into the above-mentioned form, the compressive stress can be partially applied to the portion. Therefore, the shape of the cross section can be changed at any plurality of places where compressive stress is desired to be applied.
  • the degree of freedom in applying compressive stress is higher than that in Patent Document 2 and Patent Document 3, and compressive stress can be applied as needed.
  • the cross-sectional shape can be changed in a desired plurality of regions to apply compressive stress.
  • the molding material used in the first step may be an intermediate product obtained by molding other than the target portion, in addition to the unprocessed steel plate.
  • the molding method does not matter.
  • draw (drawing) molding or foam (bending) molding can be performed.
  • the intermediate part has the same line length as the steel part in the top view and is longer than the steel part in the cross section when the shape of the step portion in the cross section perpendicular to the longitudinal direction is compared with the steel part. It can be molded using a mold having a wire length.
  • the first step for example, in order to obtain an A-pillar, for example, when drawing (drawing) molding is performed, it is cold working (normal temperature), and the pressing speed: about 40 to 60 SPM in the actual machine (in the case of analysis, the molding speed). Since there is no effect, the conditions can be 1000 SPM), holder pressurization: 60 to 100 ton.
  • draw molding for example, as shown in Examples described later, in a molding apparatus provided with a die, a punch, and a holder (wrinkle retainer), the steel plate edge is sandwiched between the die and the holder, and the vertical wall is tensioned. Is mentioned.
  • the manufacturing method of the present embodiment can be more effective when the steel sheet having a tensile strength of 980 MPa or more is used as the original plate for molding.
  • the tensile strength may be 1180 MPa or more.
  • the upper limit of the tensile strength of the steel sheet used for manufacturing the steel parts of the present embodiment is not particularly limited.
  • the upper limit of the tensile strength can be set to about 1800 MPa.
  • the steel sheet for example, a steel sheet having a thickness of 0.8 mm or more and 2.0 mm or less can be targeted.
  • a step of performing piercing punchching hole machining
  • outer peripheral trimming shearing
  • the second processing may be performed.
  • the intermediate parts are molded with a mold having the same stepped portion as the final product, and a steel part having the same stepped portion as the final product is manufactured.
  • the second step by molding the stepped portion of the intermediate part with a mold having the same shape as the final product, compressive stress can be generated in the stepped portion of the molded part as described above. As a result, the residual stress is reduced and the swing can be suppressed.
  • the steel part according to the present embodiment may be a final molded product or an intermediate molded product for further molding a portion other than the step portion.
  • the final molded product or the intermediate molded product may be further subjected to processing other than molding.
  • a mold having the same shape as the final molded product may be used for a portion other than the step portion as the mold.
  • a mold having at least a step portion having the same shape as the final molded product may be used.
  • the above steel parts can be formed, and the forming method does not matter.
  • press molding draw (drawing) molding and foam (bending) molding can be performed.
  • an A-pillar for example, in the case of foam (bending) molding, cold working (normal temperature), press speed: about 40 to 60 SPM in an actual machine (in the case of analysis, the molding speed). Since there is no effect, the condition can be 1000 SPM).
  • the intermediate molded product may be further provided with a step of molding a portion other than the step portion. Further, if necessary, the final molded product or the intermediate molded product may be provided with a step other than molding, such as piercing (punching hole processing) and outer peripheral trimming (shearing).
  • the component having one step portion on the vertical wall portion 5A has been described, but the step portion may be one step or a multi-step portion having two or more steps. Further, it is a component having a stepped portion in both the vertical wall portion 5A and the vertical wall portion 5B, and the stepped portion provided in the vertical wall portion 5A may be formed as in the present embodiment.
  • a shaped part having a top plate portion and a vertical wall, curved in the longitudinal direction, and having a stepped portion at least on the vertical wall portion on the curved concave portion side specifically, Press-molded products used for vehicle body structural parts, such as A-pillars and front pillars, can be mentioned.
  • Example 1 In Example 1, a simulation analysis by CAE was performed for the production of the A pillar schematically shown in FIG. 9 as a steel part.
  • FIG. 10 is a cross-sectional view taken along the line AA in FIG.
  • FIG. 10 is also a cross-sectional view of the line length of the stepped portion in the cross section perpendicular to the longitudinal direction.
  • the target steel part As shown in FIGS. 9 and 10, the target steel part is curved in the width direction along the longitudinal direction, has a top plate portion 4 and a flange portion 6, and has a stepped portion on the vertical wall portion 5A on the curved concave portion side.
  • step 11 draw molding of step 11 (S11)
  • step 12 foam molding with PAD of step 21 (S21)
  • trim1 in step 12 (S12) means that the outer peripheral trimming process (shearing process) is performed.
  • SB1" in step 13 (S13) and “SB2" in step 23 (S23) mean the calculation process of the springback after molding in this simulation analysis.
  • an unprocessed steel sheet was drawn-formed as A ⁇ B ⁇ C to obtain an intermediate part.
  • molding was performed with a punch 14 from the lower part to obtain an intermediate part 15.
  • the shape is longer than the line length of, that is, the shape is provided with an extra line length.
  • the ratio of the stepped portion of the steel component to the line length is set to 1.05. Further, as a comparative example, a die 11 having a stepped portion and a punch 14 having a stepped portion formed with the same mold as the final product was also prepared.
  • the intermediate parts obtained by the molding of FIG. 12 are used, and the steel parts are formed by foam forming as A ⁇ B ⁇ C. Obtained.
  • one of the dies that press the intermediate parts from above during molding is the die 16 of FIG. 13A, and the other die is located at a position away from the stepped portion of the intermediate parts and is not shown.
  • a steel sheet having a tensile strength of 1552 MPa which shows the relationship between the true strain and the true stress shown in FIG. 14, is used as the material to be used, and the steps shown in FIG. 11 described above are used under the following analysis conditions and molding conditions.
  • a simulation analysis was performed in which machining was performed in order.
  • the analysis conditions in the simulation analysis and the molding conditions other than the above are as follows.
  • FIG. 15A is the result of Comparative Example
  • FIG. 15B is the result of Example 1 of the present invention. From the results of FIG. 15, according to the embodiment of the present invention, the color tone indicating the tensile stress of the stepped portion is lightened, and the tensile stress generated in the molding in the first step is generated by the molding in the second step. It can be seen that the tensile stress was reduced by being canceled by the compressive stress.
  • Example 2 The line length of the stepped part of the intermediate part was changed, and the degree of swing was confirmed. Simulation analysis was performed in the same manner as in Example 1 of the present invention, except that the line length of the stepped portion of the intermediate component was set as shown in FIG. 16 and Table 2 below.
  • L31 indicates the line length of Example 1 of the present invention
  • L32 indicates the line length of Example 2 of the present invention
  • L33 indicates the line length of Example 3 of the present invention.
  • an enlarged view of the dotted elliptical portion is shown in the lower part of FIG. As shown in the enlarged view, when the angle of the line length L31 of the first invention example is ⁇ 1 exemplified in FIG.

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

Abstract

L'invention concerne un procédé de production d'un élément en acier qui présente une forme incurvée dans la direction longitudinale, une section transversale en forme de U ou de forme de chapeau dans une direction perpendiculaire à la direction longitudinale et qui présente, formé dans une partie de paroi verticale côté creux incurvé correspondant, une partie étagée qui s'élargit vers une ouverture, le procédé de production comprenant : une première étape de production d'un élément intermédiaire qui est formé à l'aide d'un matériau de moulage et qui présente une partie étagée dans une section transversale perpendiculaire à la direction longitudinale, la partie étagée, par rapport à l'élément en acier, présentant la même longueur que celle de l'élément en acier lorsqu'on le regarde depuis le dessus, mais présentant une forme plus longue que celle de l'élément en acier lorsqu'on le regarde en coupe transversale ; et une deuxième étape destinée à mettre en forme l'élément intermédiaire à l'aide d'une matrice métallique, qui présente une partie de paroi verticale côté creux incurvé présentant la même forme que celle de l'élément en acier et à transformer la forme de la partie de paroi verticale côté creux incurvé de l'élément intermédiaire dans la même forme que celle de la partie de paroi verticale côté creux incurvé de l'élément en acier.
PCT/JP2021/041318 2020-12-01 2021-11-10 Procédé de production d'un élément en acier WO2022118622A1 (fr)

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JP7476935B2 (ja) * 2022-09-28 2024-05-01 Ｊｆｅスチール株式会社 プレス成形品の製造方法

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Publication number Priority date Publication date Assignee Title
JP2009255117A (ja) * 2008-04-15 2009-11-05 Nippon Steel Corp 形状凍結性に優れたプレス成形方法およびその装置
JP2010064137A (ja) * 2008-09-12 2010-03-25 Nippon Steel Corp 形状凍結性に優れる多段プレス成形方法
JP2010064138A (ja) * 2008-09-12 2010-03-25 Nippon Steel Corp 形状凍結性に優れる多段プレス成形方法
JP2011147991A (ja) * 2010-01-25 2011-08-04 Honda Motor Co Ltd プレス成形方法及びそのシステム
WO2012161050A1 (fr) * 2011-05-20 2012-11-29 新日鐵住金株式会社 Procédé de moulage sous pression et composant de véhicule
JP2016203256A (ja) * 2015-04-22 2016-12-08 新日鐵住金株式会社 プレス成形品の製造方法、プレス成形品及びプレス装置
JP2019030886A (ja) * 2017-08-07 2019-02-28 Ｊｆｅスチール株式会社 プレス成形品の製造方法

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Publication number Priority date Publication date Assignee Title
JP2012051005A (ja) 2010-09-01 2012-03-15 Sumitomo Metal Ind Ltd プレス成形装置およびプレス成形品の製造方法
JP6037054B2 (ja) 2013-12-26 2016-11-30 新日鐵住金株式会社 ハット形断面部品の製造方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009255117A (ja) * 2008-04-15 2009-11-05 Nippon Steel Corp 形状凍結性に優れたプレス成形方法およびその装置
JP2010064137A (ja) * 2008-09-12 2010-03-25 Nippon Steel Corp 形状凍結性に優れる多段プレス成形方法
JP2010064138A (ja) * 2008-09-12 2010-03-25 Nippon Steel Corp 形状凍結性に優れる多段プレス成形方法
JP2011147991A (ja) * 2010-01-25 2011-08-04 Honda Motor Co Ltd プレス成形方法及びそのシステム
WO2012161050A1 (fr) * 2011-05-20 2012-11-29 新日鐵住金株式会社 Procédé de moulage sous pression et composant de véhicule
JP2016203256A (ja) * 2015-04-22 2016-12-08 新日鐵住金株式会社 プレス成形品の製造方法、プレス成形品及びプレス装置
JP2019030886A (ja) * 2017-08-07 2019-02-28 Ｊｆｅスチール株式会社 プレス成形品の製造方法

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