WO2023127695A1 - Press-forming apparatus and method for producing press-formed article - Google Patents

Press-forming apparatus and method for producing press-formed article Download PDF

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Publication number
WO2023127695A1
WO2023127695A1 PCT/JP2022/047435 JP2022047435W WO2023127695A1 WO 2023127695 A1 WO2023127695 A1 WO 2023127695A1 JP 2022047435 W JP2022047435 W JP 2022047435W WO 2023127695 A1 WO2023127695 A1 WO 2023127695A1
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WIPO (PCT)
Prior art keywords
press
portions
pair
forming
flange
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PCT/JP2022/047435
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French (fr)
Japanese (ja)
Inventor
伸 豊川
晃 佐竹
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日本製鉄株式会社
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Publication of WO2023127695A1 publication Critical patent/WO2023127695A1/en

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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 press molding device and a method of manufacturing a press molded product.
  • An example of a press-molded product obtained by press-molding a steel plate is an automobile suspension arm (see, for example, Patent Documents 1 and 2).
  • automobile suspension arms from the viewpoint of improving the marketability of automobiles, extending the life of automobiles, reducing CO2 emissions in recent years, and ensuring cruising distance due to the electrification of prime movers, the required performance (strength and rigidity) of parts has been improved. Both improvement and weight reduction are required.
  • Effective ways to reduce the weight of automotive parts include reducing the plate thickness by increasing the strength of the material (high-tensile strength), as well as integrating the functions of the press-formed product with peripheral accessory parts (parts omitted). .
  • Patent Document 1 describes a configuration in which burring is performed with a pair of flanges, that is, two vertical wall portions facing each other.
  • Patent Literature 1 discloses a mold for forming opposing burring holes in two flange portions of a workpiece having a U-shaped cross section. This mold includes a pair of burring punches (32, 33) arranged to sandwich two flanges (Fb, Fb) and a pair of semicircles arranged between the two flanges (Fb, Fb). a pair of slide dies (5, 6) which are shaped like slide dies (5, 6) and are combined with each other to form a die hole (27).
  • the two burring holes (B , B) are carried out at the same time.
  • the burring punches (32, 33) are moved away from each other, and the slide dies (5, 6) are moved away from each other.
  • the workpiece (W) is extracted upward from the burring mold.
  • such a configuration requires movement of the burring mold in various directions. This complicates the mold design and requires at least two to four or more steps, making it difficult to arrange the number of steps within the existing restrictions.
  • a flat plate is used in the stage prior to forming the pair of flanges upright instead of applying the burring forming process as described in Patent Document 1.
  • There is a method of performing burring molding on a shaped material see, for example, Patent Document 2).
  • a burring method after burring, a portion of the flat plate-shaped material is raised to form the flange. This eliminates the need for a structure that moves the punches and dies of the burring mold in multiple directions, so the burring process can be completed in a single process. It is possible without incurring an increase.
  • one of the objects of the present invention is to provide a press-molding apparatus and a method of manufacturing a press-molded product that can manufacture a press-molded product with high dimensional accuracy using a simpler method. It is in.
  • the gist of the present invention is the following press-molding apparatus and method for manufacturing a press-molded product.
  • (1) comprising a die, a punch and a die pad; the die pad is positioned inside the die; The die pad is arranged to face the punch, At the bottom dead center of molding, the die pad and the punch have a hole in the plane along the pressing direction, at the forming bottom dead center, the surface faces the die; A press molding device in which the edge of the hole is formed by the die pad and the punch.
  • a press-formed product with high dimensional accuracy can be manufactured by a simpler method.
  • FIG. 1 is a schematic perspective view of a press-formed product according to one embodiment of the present invention.
  • 2(A) is a front view of the press-formed product
  • FIG. 2(B) is a plan view of the press-formed product
  • FIG. 2(C) is a side view of the press-formed product.
  • FIG. 3A is a schematic plan view of the blank.
  • FIG. 3(B) is a schematic plan view of an intermediate molded product.
  • FIG. 4 is a schematic perspective view showing an intermediate molded product and a press molding apparatus for burring molding.
  • FIG. 5A is a schematic plan view of the intermediate molded product before trimming
  • FIG. 5B is a schematic plan view of the intermediate molded product after trimming.
  • FIG. 6 is a schematic perspective view of the main part of the press molding device for the first rising step and the intermediate molded product.
  • 7A and 7B are cross-sectional views of the work
  • FIG. 7C is a diagram showing a modification of the work.
  • FIG. 8 is a schematic perspective view of the main part of the press forming apparatus and work for the second start-up process.
  • FIG. 9 is a side view of the main part of the press forming apparatus for the second rising process at the forming bottom dead center.
  • FIGS. 10(A) to 10(C) are vertical cross-sectional views along the longitudinal direction and the height direction of a modification example of the main part at the forming bottom dead center of the press forming apparatus for the second start-up process. is.
  • FIG. 10(A) to 10(C) are vertical cross-sectional views along the longitudinal direction and the height direction of a modification example of the main part at the forming bottom dead center of the press forming apparatus for the second start-up process. is.
  • FIG. 11 is a cross-sectional view of the main part of the press forming apparatus for the second rising process, showing the state at the top dead center of forming.
  • FIG. 12 is a cross-sectional view of the main part of the press forming apparatus for the second rising process, showing the state at the forming bottom dead center.
  • FIG. 13 is a diagram showing a modification of both ends of the wide portion in the press forming apparatus for the second rising process.
  • FIG. 14 is a cross-sectional view of the main part of the press forming apparatus for the start-up process according to the modification, showing a state at the forming bottom dead center PL.
  • FIG. 1 is a schematic perspective view of a press-formed product 60 according to one embodiment of the present invention.
  • 2(A) is a front view of the press-formed product 60
  • FIG. 2(B) is a plan view of the press-formed product 60
  • FIG. 2(C) is a side view of the press-formed product 60. .
  • the press-formed product 60 is a structural component of an automobile.
  • Such structural components include, for example, chassis components.
  • Chassis parts include, for example, arms or link parts of suspension parts, specifically lower arms, front upper arms, rear upper arms, trailing arms, and the like.
  • press-molded product 60 is a suspension arm
  • press-formed product 60 is a rear lower arm
  • the press-formed product 60 is a plate member having an open cross section formed by press-forming a single steel plate multiple times.
  • the steel sheet forming the press-formed product 60 include a high-strength hot-rolled steel sheet, a hot-rolled hot-rolled hot-dip galvanized steel sheet, and the like.
  • the tensile strength of this steel plate is, for example, 440 MPa or more, for example, 590 MPa or more, for example, 780 MPa or more. The higher the tensile strength of the steel sheet, the lower the formability of the press-formed product 60 tends to be.
  • the plate thickness of the press-formed product 60 is, for example, 1.6 mm to 4.0 mm.
  • the press-formed product 60 is formed in an elongated straight shape with the longitudinal direction X1 being the direction corresponding to the left-right direction of the vehicle.
  • the press-formed product 60 is not limited to a straight shape, and may be formed in other shapes such as a groove shape and an A-shape.
  • the press-formed product 60 includes a main body 62 having a channel-shaped transverse cross section and having a base 61 and a pair of vertical walls 63A and 63B continuous with the base 61, and the pair of vertical walls 63A and 63B are adjacent to each other in the longitudinal direction X1.
  • the press-formed product 60 is an open cross-section member because the main body 62 has a grooved cross-section.
  • An open cross-section means that a cross-section perpendicular to the longitudinal direction X1 does not have a closed shape and ends in the circumferential direction of the cross-sectional shape.
  • the main body 62 may have a channel shape.
  • the groove shape includes, for example, a shape with a flange such as a hat-shaped cross section and a shape with a curved groove bottom such as a U-shaped cross section.
  • the base 61 is straight in the longitudinal direction X1 and formed in a flat shape.
  • the base 61 may not have a straight shape, and may have, for example, a C shape in cross section.
  • the base 61 may include a portion that is inclined toward one side in the thickness direction of the base 61 toward the end in the longitudinal direction X1.
  • One end of the base 61 in the longitudinal direction X1 has a base edge 61a adjacent to a pair of flanges 64A, 64B.
  • a cross section passing through the base portion edge portion 61a is formed in a shape in which a curved portion 61b, a straight portion 61c, and a curved portion 61d are continuous.
  • An end portion of the base portion edge portion 61a in the lateral direction Y1 perpendicular to the longitudinal direction X1 is a boundary portion of the base 61 between the flanges 64A and 64B.
  • the length of the base portion edge portion 61a between the pair of vertical walls 63A and 63B is the length Lp.
  • a pair of vertical walls 63A and 63B extend from a pair of ends of the base 61 in the lateral direction Y1.
  • a pair of vertical walls 63A, 63B and the base 61 form a groove. Furthermore, the cross section through the groove is an open section.
  • the angle ⁇ of each vertical wall 63A, 63B with respect to the base 61 may be within the range of 0 ⁇ 90 degrees.
  • each of the vertical walls 63A and 63B extends toward the rear surface 61f of the front surface 61e and the rear surface 61f of the base 61 (below the height direction Z1).
  • each of the flanges 64A and 64B is formed in an annular shape when viewed from the side, but may have an elliptical ring shape or a polygonal ring shape. That is, there are no particular restrictions on the contour shape of each of the flanges 64A and 64B.
  • the direction orthogonal to the longitudinal direction X1 and the lateral direction Y1 is the height direction Z1.
  • at least a portion between the pair of flanges 64A and 64B is not covered with the base 61 so that the gap 68 between the pair of flanges 64A and 64B is visible. That is, in the longitudinal direction X1, the edge 61a of the base 61 is notched before the location where the projections 65A and 65B are arranged.
  • a planned portion means a portion of the work that becomes a specific portion of the press-formed product 60 .
  • the details of the method of manufacturing the press-formed product 60 will be described later.
  • the gap 68 between the pair of flanges 64A and 64B is preferably open in the height direction Z1 over the entire area in the longitudinal direction X1.
  • a pair of protrusions 65A and 65B are provided for attaching a bush (not shown) to the press-formed product 60.
  • the bush is connected to the vehicle body via a bolt or the like (not shown).
  • each projection 65A, 65B is integrally formed with the corresponding flange 64A, 64B by burring molding, and the flange 64A, 65B is formed from the edge of the hole formed in the corresponding flange 64A, 64B. It extends in the plate thickness direction of 64B.
  • Each convex portion 65A, 65B is formed in a cylindrical shape between flanges 64A, 64B. The pair of protrusions 65A and 65B are separated from each other in this embodiment.
  • the press-formed product 60 is formed in a shape symmetrical with respect to the longitudinal direction X1. Therefore, the configurations of the pair of flanges 66A, 66B and the pair of projections 67A, 67B are the same as those of the pair of flanges 64A, 64B and the pair of projections 65, 65, so detailed description thereof will be omitted.
  • the method of manufacturing the press-formed product 60 includes a blanking step (step S1) of cutting a blank from a steel plate, a pilot hole forming step (step S2) of forming a pilot hole for burring forming from the blank, and a pilot hole forming step (step S2).
  • the first rising process (step S5) and the second rising process (step S6) are collectively referred to as the rising process.
  • the start-up process is a process of forming a work from an intermediate formed product and further forming the work into a press-formed product 60 .
  • Each step does not necessarily have to be performed continuously. For example, a blank may be purchased and the start-up process performed.
  • step S4 an example including a trimming step (step S4) is described as a method of manufacturing the press-formed product 60, but the trimming step (step S4) may be omitted.
  • the press-formed product 60 can be formed without underfill (insufficient material) or surplus even if the blank is cut along an accurate line corresponding to the shape of the press-formed product 60 in the blanking step (step S1). If the shape is good, the trimming process (step S4) can be omitted. Therefore, the trim process (step S4) may be applied as required.
  • step S5 an example including the first start-up process (step S5) is described as a method of manufacturing the press-formed product 60, but the first start-up process (step S5) may be omitted.
  • the first start-up step (step S5) instead of omitting the first start-up step (step S5), the trimmed intermediate molded product is subjected to the processing described in the second start-up step (step S6), so that one step from the intermediate molded product , the press-formed product 60 may be formed through the work. Therefore, the first start-up step (step S5) may be applied as necessary based on the degree of difficulty in forming the press-formed product 60 and the like.
  • Step S1 ⁇ Blanking Step (Step S1)>
  • a steel plate (not shown) is prepared, and blanks 10 are cut out from the steel plate by press working or the like.
  • FIG. 3A is a schematic plan view of the blank 10.
  • the blank 10 has an outline shape that is generally similar to the unfolded shape of the press-formed product 60, and the portions where the convex portions 65A, 65B, 67A, and 67B are formed correspond to a flat shape.
  • pilot holes 11A, 11B, 12A, and 12B are formed in the blank 10 .
  • prepared holes 11A, 11B, 12A, and 12B are formed as shown in FIG. It is formed.
  • the blank 10 becomes the intermediate molded product 20 .
  • FIG. 3B is a schematic plan view of the intermediate molded product 20.
  • the term "intermediate molded product” has the same meaning as "work”, but in the present embodiment, the part to be processed in the second start-up process for molding the press-formed product 60 is referred to as "work”, and the part to be processed until it becomes the work is referred to as "work”. It is called an intermediate molded product.
  • FIG. 4 is a schematic perspective view showing an intermediate molded product 20 and a press molding apparatus 100 for burring molding.
  • a pair of projections 65A and 65B and a pair of projections 67A and 67B are formed on an intermediate molded product 20 which is a material of a press molded product 60, and the intermediate molded product 20 is an intermediate molded product which is a burred material.
  • Product 30 is
  • the press molding apparatus 100 has a plurality of first molds 110 (punches), second molds 120 (blank holders), and third molds 130 (dies). there is
  • the intermediate molded product 20 is placed on the third mold 130 of the press molding device 100 .
  • the intermediate molded product 20 is pressed against the third mold 130 by the second mold 120 .
  • the first mold 110 is displaced toward the third mold 130 .
  • the plurality of first molds 110 perform burring processing on the pilot holes 11A, 11B, 12A, and 12B of the intermediate molded product 20, and projecting portions 65A, 65B, 67A, and 67B are formed on both ends of the intermediate molded product 20 in the longitudinal direction. is molded.
  • the intermediate molded product 20 becomes an intermediate molded product 30 as shown in FIG. 5(A).
  • FIG. 5A is a schematic plan view of the intermediate molded product 30 before trimming.
  • step S4 In the trim process, the periphery of the intermediate molded product 30 is trimmed. This trimming may be performed by a press molding device (not shown) or by a cutter (not shown), and the specific processing method is not limited.
  • the intermediate molded product 30 becomes an intermediate molded product 40 as shown in FIG. 5(B).
  • FIG. 5B is a schematic plan view of the intermediate molded product 40 after trimming. A portion of the intermediate molded product 30 before trimming that has been cut out in the trimming process is indicated by a chain double-dashed line in FIG. 5(B).
  • the shape of the intermediate molded product 40 corresponds to the shape of a developed view in which the press-molded product 60 is developed into a planar shape.
  • Step S5 press molding (first start-up molding) is performed on the intermediate molded product 40 using the press molding device 200 for the first start-up process.
  • FIG. 6 is a schematic perspective view of the press molding device 200 for the first rising step and the main parts of the intermediate molded product 40.
  • FIG. 7A and 7B are cross-sectional views of the workpiece 50, respectively. As shown in FIGS. 1, 6, 7(A), 7(B), and FIG. 8, which will be described later, in the first rising step, a workpiece 50 is molded from an intermediate molded product 40. As shown in FIG.
  • the workpiece 50 includes a scheduled base portion 51 as a scheduled portion of the base 61, a pair of scheduled vertical wall portions 53A and 53B formed as scheduled portions of a pair of vertical walls 63A and 63B and rising from the scheduled base portion 51, and a pair of flanges 64A. , 64B.
  • the pre-base portion 51 has, for example, a curved shape that protrudes in one direction in the height direction Z1.
  • the pair of planned vertical wall portions 53A and 53B are plate-like portions adjacent to both ends of the planned base portion 51 in the transverse direction Y1 of the workpiece 50. As shown in FIG.
  • the pair of pre-flange portions 54A and 54B are plate-shaped portions adjacent to the pair of pre-vertical wall portions 53A and 53B in the longitudinal direction X1. Since both ends of the planned base portion 51 in the transverse direction Y1 are curved in the cross section, the pair of planned flange portions 54A and 54B on the same plane as the planned vertical wall portions 53A and 53B face each other in the transverse direction Y1. are doing.
  • Protrusions 65A and 65B are arranged on the pair of pre-flange portions 54A and 54B on opposing surfaces 54aA and 54aB of the pair of pre-flange portions 54A and 54B, respectively.
  • the workpiece 50 may be formed in a shape symmetrical with respect to the longitudinal direction X1 of the workpiece 50 and have a pair of planned flange portions 56A and 56B as planned portions of the pair of flanges 66A and 66B.
  • the interval between the planned vertical wall portions 53A and 53B may increase as the distance from the planned base portion 51 increases.
  • the mold of the press molding apparatus 200 is elongated in a longitudinal direction X2 as a horizontal direction and short in a lateral direction Y2 as a horizontal direction perpendicular to the longitudinal direction X2.
  • a plurality of molds are arranged in the height direction Z2.
  • the longitudinal direction X2, the lateral direction Y2, and the height direction Z2 are the longitudinal direction X1 and the lateral direction of the work 50 on the press forming device 200 when the intermediate product 40 is formed into the work 50 by the press forming device 200. It coincides with the direction Y1 and the height direction Z1.
  • the height direction, upward direction, and downward direction are press directions.
  • the horizontal direction is the direction perpendicular to the pressing direction.
  • the press direction is often vertical, the horizontal direction in this disclosure does not necessarily mean a direction perpendicular to the vertical direction.
  • the mold of the press molding device 200 may be formed in a shape symmetrical with respect to the longitudinal direction X2.
  • the operation of the mold of the press molding device 200 to mold the intermediate molded product 40 into the workpiece 50 is also symmetrical with respect to the longitudinal direction X2. Therefore, regarding the press operation in the press forming apparatus 200, the configuration on one side in the longitudinal direction X2 will be mainly described, and the detailed description of the configuration on the other side in the longitudinal direction X2 will be omitted.
  • the press molding device 200 has a first mold 210 (lower mold, punch), a second mold 220 (die pad), and a third mold 230 (die).
  • the first mold 210 has a punch convex portion 212 .
  • the punch projection 212 is fixed to a base (not shown).
  • the punch convex portion 212 is a convex portion extending along the longitudinal direction X2, and rises from the base toward the second mold 220 side.
  • the punch convex portion 212 has a forming portion 215 for a planned base portion.
  • the planned base part forming part 215 is provided for forming the planned base part 51 of the workpiece 50 from the intermediate molded product 40 .
  • the planned base portion molding portion 215 is formed in a shape that follows the shape of the rear surface of the planned base portion 51 .
  • Recessed portions 218A and 218B are formed on a pair of side surfaces in the lateral direction Y2 of the punch convex portion 212 facing the convex portions 65A and 65B.
  • the distance between the recessed portions 218A and 218B is smaller than the width of the pre-base portion molding portion 215 in the lateral direction Y2.
  • the second mold 220 is provided to hold the intermediate molded product 40 against the first mold 210 .
  • the second mold 220 has a pressing portion 222 that presses the expected base portion 51 against the expected base portion molding portion 215 .
  • the third mold 230 burrs the intermediate molded product 40 by moving toward the first mold 210 while the intermediate molded product 40 is sandwiched between the first mold 210 and the second mold 220. .
  • the third mold 230 has a pair of split bodies 231A and 231B aligned in the lateral direction Y2.
  • the pair of divided bodies 231A and 231B has a pair of vertical wall portion forming portions 232A and 232B and a pair of flange portion forming portions 233A and 233B.
  • the third mold 230 may be a single mold, and the single mold may include parts corresponding to the divided bodies 231A and 231B.
  • the second mold 220 is arranged between the split bodies 231A and 231B. If the third mold 230 is one mold, the second mold 220 is arranged inside the third mold 230 . In any case, the second mold 220 is arranged inside the third mold 230 .
  • a pair of pre-planned vertical wall portions 232A and 232B are provided to form a pair of pre-planned vertical wall portions 53A and 53B from the intermediate molded product 40.
  • the pair of preliminarily-planned-portion forming portions 232A, 232B are formed on the inner side surfaces of the pair of divided bodies 231A, 231B and include surfaces inclined with respect to the height direction Z1.
  • the pair of pre-flange portion forming portions 233A and 233B are provided for forming the pair of pre-flange portions 54A and 54B.
  • the pair of preliminarily-planned-portion forming portions 232A, 232B are formed on the inner side surfaces of the pair of divided bodies 231A, 231B and include surfaces inclined with respect to the height direction Z1.
  • the second mold 220 is moved toward the first mold 210 by an actuator (not shown). Thereby, the intermediate molded product 40 is sandwiched between the first mold 210 and the second mold 220 .
  • the third mold 230 is moved toward the first mold 210 to a predetermined bottom dead center by an actuator (not shown). As a result, the pair of divided bodies 231A and 231B of the third mold 230 move toward the first mold 210 through both sides of the second mold 220 in the transverse direction Y2.
  • the pair of vertical wall preliminarily forming portions 232A and 232B push down the portion of the intermediate molded product 40 that protrudes in the lateral direction Y2 from the punch convex portion 212 toward the first mold 210, thereby forming a pair of vertical wall portions.
  • the expected wall portions 53A and 53B are formed.
  • the pair of pre-flange portion forming portions 233A and 233B are formed by pushing down the portion of the intermediate molded product 40 that protrudes in the lateral direction Y2 from the punch convex portion 212 toward the first mold 210.
  • 54A and 54B are molded.
  • the first mold 210 , the second mold 220 , and the third mold 230 cooperate to mold the pre-base portion 51 .
  • the press forming apparatus 200 also forms a pair of pre-flange portions 56A and 56B similar to the pair of pre-flange portions 54A and 54B. As a result, the intermediate molded product 40 becomes the workpiece 50 .
  • the angle ⁇ 2 of the vertical wall portions 53A, 53B and the flange portions 54A, 54B, 57A, 57B with respect to the height direction Z1 is 90 degrees depending on the tensile strength and plate thickness of the work 50. It is appropriately set within the following range.
  • the work 50 shown in FIGS. 7A, 7B, and FIG. 7C, which will be described later, is merely an example of the work.
  • the space between the pair of pre-flange portions 54A and 54B is open on both sides in the height direction Z1 (pressing direction P described later).
  • the space between the pair of pre-flange portions 56A and 56B is open on both sides in the pressing direction P.
  • the planned base portion 51 includes a planned base portion edge portion 51a adjacent to the pair of planned flange portions 54A and 54B.
  • the planned base portion edge portion 51a is formed in a curved shape having a predetermined radius of curvature when viewed from the longitudinal direction X1.
  • the planned base portion 51 When viewed from the longitudinal direction X1, the planned base portion 51 is formed in, for example, a single arch shape shown in FIGS. 7(A) and 7(B).
  • the pre-base portion 51 may be formed in a shape having an arch shape on both sides in the lateral direction Y1, as shown in the modified example of FIG. 7(C).
  • Each arch shape is formed, for example, in a shape that protrudes toward the surface side (upper side) of the planned base portion 51 .
  • arch shapes are formed at both ends of the planned base portion 51 in the lateral direction Y1, and one ends of these arch shapes are connected in a straight line.
  • the length of the planned base portion edge portion 51a between the pair of planned vertical wall portions 53A and 53B is the length Lq when viewed from the longitudinal direction X1.
  • the length of the base portion edge between the pair of vertical walls 63A and 63B is the length Lp (Fig. 2(C)).
  • Lp Fig. 2(C)
  • FIGS. 2(C), 7(A) and 7(C) as an example, preferably 1.0 ⁇ Lq/Lp ⁇ 1.2. If Lq/Lp is less than the above lower limit, when the workpiece 50 is formed into the press-formed product 60, a large tensile load is likely to occur on the edge portion 51a of the planned base portion 51. As a result, a gap between the tips of the pair of vertical walls 63A and 63B is increased, and the dimensional accuracy of the press-formed product 60 is deteriorated.
  • the wall opening (warp amount S) can be suppressed, and the tensile stress generated on the outside of the bending due to the wall opening can be alleviated.
  • the warp amount S is a value that indicates how much the tip of the vertical wall 63A or the tip of the vertical wall 63B is displaced from its original position in the lateral direction Y1.
  • the tensile stress generated on the outside of the bend of the press-formed product 60 and the compressive stress generated on the inside of the bend can be made larger, and wall opening can be further suppressed.
  • the warp amount S (wall opening amount) could be reduced by about 30% at maximum.
  • Step S6 the press forming device 300 for the second start-up process is used to perform press forming (second start-up forming) on the workpiece 50 .
  • FIG. 8 is a schematic perspective view of the press forming apparatus 300 for the second start-up process and the principal parts of the workpiece 50.
  • FIG. 9 is a side view of the principal parts of the press forming apparatus 300 at the forming bottom dead center PL.
  • 10(A) to 10(C) are vertical cross-sectional views along the longitudinal direction X2 and the height direction Z2, respectively, of modifications of the main portion of the press forming apparatus 300 at the forming bottom dead center.
  • FIG. 11 is a cross-sectional view of the main part of the press forming apparatus 300, showing a state at the forming top dead center PU.
  • FIG. 12 is a cross-sectional view of the main part of the press forming apparatus 300, showing a state at the forming bottom dead center PL.
  • a press-formed product 60 is formed from the workpiece 50.
  • FIGS. 8 to 12 in the second start-up process, a press-formed product 60 is formed from the workpiece 50.
  • the positions of the members 310, 320, 330 when the punch 310 and the die pad 320 and the die 330 are closest to each other are the forming bottom dead points PL. Further, the position of each member 310, 320, 330 when the punch 310, the die pad 320 and the die 330 are most separated is the forming top dead point PU.
  • the direction from the die pad 320 to the punch 310 in the pressing direction P is the first direction P1
  • the direction opposite to the first direction P1 is the second direction P2.
  • the first direction P1 is downward and the second direction P2 is upward.
  • the mold of the press molding apparatus 300 is elongated in the longitudinal direction X2 and short in the lateral direction Y2, and has a configuration in which a plurality of molds are arranged in the height direction Z2. ing.
  • the longitudinal direction X2, the lateral direction Y2, and the height direction Z2 coincide with the longitudinal direction X1, the lateral direction Y1, and the height direction Z1 of the work 50 when the work 50 is placed on the press forming device 300.
  • the height direction Z2 coincides with the press direction P in the press molding device 300. As shown in FIG.
  • the mold of the press molding device 300 may be formed in a shape symmetrical with respect to the longitudinal direction X2.
  • the operation of the mold of the press-molding device 300 to mold the work 50 into the press-molded product 60 is also symmetrical with respect to the longitudinal direction X2. Therefore, regarding the press operation in the press forming apparatus 300, the configuration on one side in the longitudinal direction X2 will be mainly described, and the detailed description of the configuration on the other side in the longitudinal direction X2 will be omitted.
  • the press molding device 300 has a punch 310 , a die pad 320 and a die 330 .
  • the die pad 320 and the die 330 move in the pressing direction P with respect to the punch 310 .
  • the punch 310 has a punch body 312 .
  • the punch body 312 is fixed to a base (not shown).
  • the punch body 312 is a convex portion extending along the longitudinal direction X2.
  • the punch body 312 has first flange forming portions 313A and 313B, a stopper 314, a base forming portion 315, and vertical wall forming portions 316A and 316B.
  • the first flange forming portions 313A and 313B are portions facing the pre-flange portions 54A and 54B of the workpiece 50 placed on the punch 310 in the lateral direction Y2, and the facing surfaces 54aA and 54aB of the pre-flange portions 54A and 54B. By receiving a part of the flange preliminaries 54A and 54B, the flanges 64A and 64B are formed. First flange forming portions 313A and 313B are provided on a pair of end faces of the punch body 312 in the lateral direction Y2.
  • the first flange forming portions 313A and 313B receive the facing surfaces 54aA and 54aB (inner surfaces) of the pair of pre-flange portions 54A and 54B during the second rising process.
  • the first flange forming portions 313A and 313B are planes along the pressing direction P and perpendicular to the lateral direction Y2.
  • the first flange forming portions 313A and 313B are arranged on one end side (right side in FIG. 8) of the punch body 312 in the longitudinal direction X2.
  • the first flange forming portions 313A and 313B have an angular range of most (approximately 2/3 of 360 degrees) in the circumferential direction of the pre-flange portions 54A and 54B of the pre-flange portions 54A and 54B. It is configured to come into contact during press molding.
  • the first flange forming portions 313A and 313B are provided in the punch 310 which is the lower die of the press forming device 300, the first flange forming portions 313A and 313B are formed as a pair of flanges in the pressing direction P. It is arranged between one ends (lower ends) of the portions 54A and 54B to receive the pre-flanged portions 54A and 54B.
  • depressions 318A and 318B are formed in a pair of end faces in the lateral direction Y2 at locations adjacent to the first flange forming parts 313A and 313B.
  • the distance (width) between the recessed portions 318A and 318B is smaller than the width of the base forming portion 315 and smaller than the distance between the first flange forming portions 313A and 313B.
  • a portion of the punch body 312 where the depressions 318A and 318B are formed serves as a stopper 314. As shown in FIG.
  • the stopper 314 is between the projecting portions 65A and 65B of the workpiece 50.
  • the stopper 314 functions as a positioning member for the projections 65A and 65B during the second rising process by receiving the tips of the projections 65A and 65B. More specifically, a pair of end surfaces of the stopper 314 in the lateral direction Y2 receive the protrusions 65A and 65B.
  • the pair of end faces of the stopper 314 are faces along the pressing direction P and perpendicular to the lateral direction Y2. Lower portions of the pair of end surfaces of the stopper 314 are formed in an arc shape along the shape of the projections 65A and 65B. Upper ends of the pair of end surfaces of the stopper 314 are open to the die pad 320 side.
  • a tip surface 314a (upper end) of the stopper 314 is arranged downward (one side in the pressing direction P) of the upper end surface of the punch body 312 where the base molding portion 315 is formed. That is, in the pressing direction P, the tip surface 314 a of the stopper 314 is arranged at a position recessed from the base forming portion 315 .
  • An offset amount OF which is the distance from the base forming portion 315 to the upper end surface 314a of the stopper 314, is preferably 0 mm or more and OFmax or less, for example.
  • the height position of the upper end of the upper end surface 314a is the height of the upper ends of the convex portions 65A and 65B of the press-formed product 60 placed on the punch 310 when the second rising process is completed. match the position.
  • the offset amount OF exceeds the above upper limit, the die 330 moves in the first direction P1 while the die pad 320 is pressing the workpiece 50, and the third flange forming portions 333A and 333B move to the planned flange portions 54A and 54B, which will be described later.
  • the tip surface 314a of the stopper 314 When viewed from the lateral direction Y2, the tip surface 314a of the stopper 314 has an arc shape in this embodiment.
  • the shape of the tip surface 314a may be an arc shape with a constant radius of curvature, or an arc shape with a plurality of radii of curvature, and may match the shape of the tip surface 323a of the wide portion 323 described later. It may be in shape.
  • the base forming part 315 is provided for forming the base 61 of the press-formed product 60 from the work 50.
  • the base molding portion 315 is formed in a shape that follows the shape of the back surface of the base 61 .
  • the base molding portion 315 is provided on the upper end surface of the punch body 312, and in this embodiment, is formed in a flat shape with both ends in the lateral direction Y2 curved when viewed from the longitudinal direction X2.
  • Vertical wall molding portions 316A and 316B extend downward from both ends of the base molding portion 315 in the lateral direction Y2.
  • the vertical wall forming portions 316A, 316B are provided to form the vertical walls 63A, 63B of the press-formed product 60 from the work 50.
  • a pair of vertical wall forming portions 316A and 316B are formed on a pair of end faces of the punch body 312 in the lateral direction Y2, and include surfaces parallel to the pressing direction P in this embodiment.
  • the die pad 320 cooperates with the punch 310 to sandwich the planned base portion 51 as the planned portion of the base 61 .
  • the die pad 320 is arranged to face the punch 310 in the pressing direction P.
  • the die pad 320 is located inside the die 330 .
  • the die pad 320 is arranged in a space defined by divided bodies 331A and 331B of the die 330 at the molding bottom dead center PL.
  • the die pad 320 is a member elongated in the longitudinal direction X2.
  • the die pad 320 is moved in the press direction P by an actuator (not shown).
  • the die pad 320 is a portion elongated in the longitudinal direction X2 and has a shape that allows the divided bodies 331A and 331B of the die 330 to pass therethrough.
  • the die pad 320 includes a shaft-shaped portion 321 extending in the longitudinal direction X2, a holding portion 322 formed on the shaft-shaped portion 321 and holding the pre-base portion 51, and a pressing portion 322 formed on the shaft-shaped portion 321 and extending in the longitudinal direction X2 with respect to the holding portion 322.
  • a wide portion 323 arranged on one side and having a width wider than the width of the shaft-like portion 321 is provided.
  • the pressing portion 322 is arranged at a portion of the die pad 320 facing the base molding portion 315 in the pressing direction P.
  • the pressing portion 322 is formed on the lower end surface of the pressing portion 322 and is elongated in the longitudinal direction X2. It is the surface.
  • the wide portion 323 is provided as a core for receiving the pair of pre-flange portions 54A and 54B between the facing surfaces 54aA and 54aB of the pair of pre-flange portions 54A and 54B. It is arranged on the die pad 320 side (upper side) in the pressing direction P in the middle. Although the wide portion 323 is provided as a part of the die pad 320 in this embodiment, it may not be so.
  • the wide portion 323 may be configured by a member separate from the die pad 320 and movable in the pressing direction P independently of the die pad 320 . Even in that case, the wide portion 320 is considered part of the die pad 320 because it is a pad inside the die.
  • the wide portion 323 of the shaft portion 321 faces the stopper 314 of the punch 310 in the pressing direction P and protrudes downward from the shaft portion 321 .
  • a pair of end faces in the lateral direction Y2 of the wide portion 323 include second flange forming portions 324A and 324B.
  • the second flange forming portions 324A and 324B receive the facing surfaces 54aA and 54aB (inner side surfaces) of the pair of pre-flange portions 54A and 54B.
  • the second flange forming portions 324A and 324B are planes parallel to the pressing direction P and perpendicular to the lateral direction Y2.
  • the second flange forming portions 324A and 324B are formed by an angle range of a portion (about 1/3 of 360 degrees) in the circumferential direction of the pre-flange portions 54A and 54B and a press angle. It is configured to contact during molding.
  • the second flange forming portions 324A, 324B are formed in a shape along the shape of the facing surfaces 64aA, 64aB of the flanges 64A, 64B.
  • the width W32 of the wide portion 323 (the second flange forming portions 324A and 324B) in the lateral direction Y2 matches the distance between the facing surfaces 64aA and 64aB of the pair of flanges 64A and 64B, and , and the width of the first flange forming portions 313A and 313B.
  • the width W32 is larger than the width W31 of the shaft-like portion 321. As shown in FIG. This suppresses mutual interference between the die pad 320 and the die 330 .
  • the wide portion 323 is arranged in the space S3.
  • the space S3 is a space between the tip surface 314a of the stopper 314 in the punch 310 and the tip surface 312a (the base molding portion 315) of the punch body 312 when viewed from the lateral direction Y2.
  • the wide portion 323 is arranged between the other ends (between the upper ends) of the pair of pre-flange portions 54A and 54B in the pressing direction P. As shown in FIG.
  • the first and second flange forming portions 313A, 313B, 324A, and 324B form a pair of pre-flange portions 54A and 54B when the press forming device 300 brings the pair of pre-flange portions 54A and 54B closer to each other to form a pair of flanges 64A and 64B. It is arranged to receive the opposing surfaces 54aA and 54aB of 54A and 54B.
  • the second flange forming portions 324A and 324B are arranged near the base portion 51 (upper side) in the pressing direction P, and the first flange forming portions 313A and 313B are arranged. is disposed on the opposite side (lower side) of the planned base portion 51 .
  • the wide portion 323 formed with the second flange forming portions 324A and 324B may be in contact with or separated from the stopper 314 .
  • the length of the second flange forming portions 324A and 324B in the longitudinal direction X2 may be the length of the stopper 314 or less.
  • first and second flange forming portions 313A and 324A are arranged on the same plane in order to make the flange 64A flatter.
  • first and second flange forming portions 313B and 324B are arranged on the same plane in order to make the flange 64B flatter.
  • the dimensional accuracy of the flanges 64A, 64B when molded to form the flanges 64A, 64B can be increased.
  • the distal end surface 323a of the wide portion 323 when viewed from the lateral direction Y2, that is, in a vertical cross section along the longitudinal direction X2 and the height direction Z2, the distal end surface 323a of the wide portion 323 is formed in an arc shape.
  • the wide portion 323 is formed in an arc shape.
  • the center of curvature of the distal end surface 323a of the wide portion 323 substantially coincides with the center of curvature of the distal end surface 314a of the stopper 314 when viewed from the lateral direction Y2.
  • the distal end surface 323a may be formed in an elliptical arc shape when viewed from the lateral direction Y2.
  • the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 is formed in a wedge shape or the like. good too.
  • the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 changes upward in the pressing direction P (second direction P2 side) as the distance from the base forming portion 315 increases along the longitudinal direction X2. ) is formed in an inclined shape.
  • the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 is parallel to the longitudinal direction X2.
  • the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 changes downward in the pressing direction P (first direction P1) as the distance from the base forming portion 315 increases along the longitudinal direction X2 side).
  • the wide portion 323 can be smoothly moved in and out of the gap between the pair of flanges 64A and 64B. can.
  • first and second flange forming portions 313A and 324A and first and second flange forming portions. 313B and 324B both face the die 330 in the transverse direction Y2.
  • holes 400A are formed in the first and second flange forming portions 313A and 324A
  • holes 400B are formed in the first and second flange forming portions 313B and 324B. Edges 400aA and 400aB of these holes 400A and 400B are formed by die pad 320 and punch 310. As shown in FIG.
  • the holes 400A, 400B are located where the depressions 318A, 318B are arranged.
  • Edges 400aA and 400aB of holes 400A and 400B are present at locations other than gap 401 between die pad 320 and punch 310 in this embodiment. That is, the narrower the gap 401 between the die pad 320 and the punch 310, the wider the existence range of the edges 400aA and 400aB in the circumferential direction of the holes 400A and 400B.
  • the edges 400aA and 400aB are present over substantially the entire circumference of the holes 400A and 400B.
  • the edge portion 400aA is continuous with the first and second flange forming portions 313A, 324A
  • the edge portion 400aB is continuous with the first and second flange forming portions 313B, 324B.
  • both end portions 323b and 323c in the lateral direction Y2 where the pair of flanges 64A and 64B face each other among the tip edge portions of the wide portion 323 in the first direction P1 have a curved shape.
  • the radius of curvature r of each of the ends 323b and 323c is set to r ⁇ t/2. It is By forming such curved portions, the wide portion 323 and the pre-flange portions 54A and 54B (flanges 64A and 64B) can be brought into smooth contact.
  • both ends 323b and 323c may have chamfered shapes instead of curved shapes, as shown in FIG. 13A and 13B are views showing modifications of both end portions 323b and 323c of the wide portion 323.
  • FIG. 13A and 13B are views showing modifications of both end portions 323b and 323c of the wide portion 323.
  • the length C of the chamfer is C ⁇ t ⁇ 2/2.
  • the die 330 moves toward the punch 310 (first direction P1 side of the pressing direction P) while the work 50 is sandwiched between the punch 310 and the die pad 320. is molded into a press-molded product 60.
  • the die 330 has a pair of split bodies 331A and 331B aligned in the lateral direction Y2.
  • the die 330 is not limited to this, and the die 330 may be one mold, and the parts corresponding to the divided bodies 331A and 331B may be included in one mold.
  • Die pad 320 is arranged between divisions 331A and 331B. If the die 330 is a mold, the die pad 320 is placed inside the die 330 . In any event, die pad 320 is located inside die 330 .
  • a pair of divided bodies 331A and 331B are formed in an elongated shape in the longitudinal direction X2.
  • the pair of divided bodies 331A and 331B are configured to be integrally movable in the pressing direction P by an actuator (not shown).
  • the pair of divided bodies 331A and 331B are movable in the press direction P independently of the die pad 320, and are arranged so as to sandwich the die pad 320 in the transverse direction Y2.
  • the pair of divided bodies 331A, 331B has a pair of vertical wall forming portions 332A, 332B and a pair of third flange forming portions 333A, 333B.
  • the pair of vertical wall forming portions 332A, 332B are provided to form the pair of vertical wall presumed portions 53A, 53B into the pair of vertical walls 63A, 63B.
  • the pair of vertical wall forming portions 332A, 332B are formed on the inner side surfaces of the pair of divided bodies 331A, 331B.
  • the upper portions of the pair of vertical wall forming portions 332A and 332B extend parallel to the pressing direction P and are orthogonal to the lateral direction Y2.
  • a pair of third flange forming portions 333A, 333B are arranged so as to be aligned with the pair of vertical wall forming portions 332A, 332B in the longitudinal direction X2.
  • a pair of third flange forming portions 333A, 333B cooperate with a pair of first flange forming portions 313A, 313B and a pair of second flange forming portions 324A, 324B to form a pair of flanges 64A, 64B.
  • the pair of third flange forming portions 333A, 333B are formed on the inner side surfaces of the pair of split bodies 331A, 331B.
  • the pair of third flange forming portions 333A and 333B receive outer side surfaces 54bA and 54bB of the pair of pre-flange portions 54A and 54B opposite to the facing surfaces 54aA and 54aB.
  • the first direction side end portions 333aA and 333aB are formed over an angular range of 90 degrees and are continuous with the lower end surfaces of the pair of divided bodies 331A and 331B.
  • This lower end surface is a horizontal surface in this embodiment.
  • the curvature radius R of the first direction side end portions 333aA and 333aB is the curvature radius R when viewed from the longitudinal direction X2.
  • the length of the pressing direction P of the opposing regions of the punch 310 and the die 330 at the locations where the respective flange forming portions 313A, 333A; 313B, 333B are provided is the length h1 is.
  • the height of the pair of flanges 64A and 64B in the pressing direction P is height h2.
  • the thickness of the workpiece 50 is smaller than the amount of press movement (stroke) in the press direction P in the press forming device 300 .
  • the starting point of the upper end of the height h1 and the starting point of the upper end of the height h2 are substantially at the same position.
  • the curvature radius R is set to 10 mm ⁇ R ⁇ (h1 ⁇ h2) mm (where h1 ⁇ h2 is 10 mm or more).
  • the radius of curvature R of the first direction side end portions 333aA and 333aB can be set to a sufficiently large value.
  • the die 330 is returned from the forming bottom dead center PL to the forming top dead center PU.
  • a moment force (cause of warpage) generated in the vertical walls 63A, 63B due to bending-back deformation (bending-bending-back action) of the flanges 64A, 64B can be reduced to a smaller value.
  • the warp amount S is a value that indicates how much the tip of the vertical wall 63A or the tip of the vertical wall 63B is displaced from its original position in the lateral direction Y1.
  • the first direction side end portions of the pair of vertical wall forming portions 332A and 332B correspond to the first direction side end portions 333aA and 333aB of the third flange forming portions 333A and 333B. formed in the same shape as
  • the press work in the press molding device 300 will be explained.
  • the die pad 320 as a pad is driven by an actuator (not shown) to the punch 310 side (second die) ahead of the die 330. It is moved in one direction P1).
  • the work 50 is sandwiched between the punch 310 and the die pad 320 , and the die pad 320 suppresses positional deviation of the work 50 .
  • the wide portion 323 of the die pad 320 enters between the pair of pre-flange portions 54A and 54B of the workpiece 50 prior to the second rising step. That is, the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B enter between the pair of pre-flange portions 54A, 54B of the workpiece 50 prior to the second rising step.
  • the die 330 is moved toward the punch 310 (in the first direction P1) to a predetermined forming bottom dead center PL by an actuator (not shown), thereby moving the punch 310 and the die 330 in the pressing direction. approach P.
  • the pair of vertical wall forming portions 332A and 332B are formed by pressing the planned vertical wall portions 53A and 53B of the workpiece 50 against the vertical wall forming portions 316A and 316B of the punch 310, thereby forming the pair of planned vertical wall portions 53A and 53B. bring closer to each other.
  • the pair of vertical wall pre-determined portions 53A, 53B are molded into the pair of vertical walls 63A, 63B.
  • the pair of third flange forming portions 333A, 333B of the die 330 press the flange-provisioning portions 54A, 54B of the workpiece 50 into the first flange forming portions 313A, 313B of the punch 310 and the second flange forming portions 324A, 324A of the die pad 320, 324B.
  • the pair of pre-flange portions 54A and 54B are brought closer to each other and formed into the pair of flanges 64A and 64B.
  • the projections 65A, 65B formed on the facing surfaces 64aA, 64aB of the pre-flange portions 64A, 64B of the work 50 on the punch 310 side are inside the holes 400A, 400B.
  • the workpiece 50 (pre-flange portions 64A, 64B) around the projections 65A, 65B in the holes 400A, 400B is formed on the surface of the die pad 320 and the punch 310 along the pressing direction P (second 1 flange forming parts 313A, 313B and second flange forming parts 324A, 324B) and the third flange forming parts 333A, 333B of the die 330.
  • the sides of the projections 65A, 65B in the holes 400A, 400B and the die pad 320 directly face each other. That is, there is nothing between the protrusions 65A and 65B and the die pad 320.
  • the punch 310 , the die pad 320 , and the die 330 work together to form the pre-base portion 51 on the base 61 .
  • the first flange forming portions 313A and 313B are arranged from one side in the pressing direction P in the press forming apparatus 300 between the pair of pre-flange portions 54A and 54B.
  • the second flange forming portions 324A and 324B are arranged from the other side in the pressing direction P.
  • the die 330 of the press forming device 300 is relatively moved along the pressing direction P toward the punch 310 side.
  • the pair of planned vertical wall portions 53A and 53B are brought closer together to form a pair of vertical walls 64A and 64B, and the pair of planned flange portions 54A and 54B are brought closer together and formed into a pair of flanges 64A and 64B.
  • the mold of the press molding device 300 is formed in a shape symmetrical with respect to the longitudinal direction X1. Thereby, a pair of flanges 66A, 66B are formed in the same manner as the pair of flanges 64A, 64B. As a result, the workpiece 50 becomes a press-formed product 60 .
  • the die pad 320 and the die 330 are returned to the forming top dead center PU by simultaneously moving in the second direction P2 with respect to the punch 310, for example. After that, the press-formed product 60 is removed from the punch 310 without interfering with any of the punch 310 , the die pad 320 and the die 330 .
  • the workpiece 50 into the press-formed product 60 while filling the space between the punch 310 and the die pad 320 with the wide portion 323 of the die pad 320, the deviation and distortion of the shape are corrected, and the convex shape is formed.
  • Vertical wall molding including the portions 65A and 65B can be realized.
  • the step of forming the flanges 64A and 64B after forming the convex portions 65A and 65B can be realized. Therefore, for example, in a process within the existing restrictions, it is possible to realize molding of a suspension arm component having convex portions 65A and 65B arranged opposite to each other. Further, by arranging the protrusions 65A and 65B to face each other, it is possible to realize a suspension arm having an integral structure in which the collar parts for fastening the press-molded product 60 and the vehicle body are integrated and omitted.
  • the planned flange portions 54A It was necessary to fill the void between 54B by some kind of contrivance of the mold structure.
  • the inventor of the present application initially devised the shape of the punch in the press forming device corresponding to the press forming device 300, and made the cross-sectional shape perpendicular to the longitudinal direction convex (first flange forming portions 313A, 313B and (shape including stopper 314) to I-shape (shape in which shapes corresponding to second flange formed portions 324A and 324B are added to the upper ends of first flange formed portions 313A and 313B).
  • I-shape shape in which shapes corresponding to second flange formed portions 324A and 324B are added to the upper ends of first flange formed portions 313A and 313B.
  • the die pad 320 as the upper mold pad is provided with a projection, that is, a wide width portion 323, so that the projection and the die pad 320 and the die 330 are separated from the punch 310 after the molding is completed. Interference with the punch can be avoided, and the problem of suppressing distortion of the shape of the flange can be solved in the mass production process.
  • the press forming device 300 press-forms the press-formed product 60 from the workpiece 50
  • the punch 310 and the die pad 320 move in the press direction P while avoiding the convex portions 65A and 65B.
  • the pre-flange portions 54A and 54B can be received from both sides of the convex portions 65A and 65B. Therefore, the protrusions 65A, 65B can be prevented from interfering with the punch 310 and the die pad 320, and the pair of pre-flange portions 54A, 54B (flanges 64A, 64B) can be prevented from being distorted.
  • the pair of pre-flange portions 54A, 54B are arranged. It is possible to suppress distortion of the shape of the flanges 64A, 64B when forming the pair of flanges 64A, 64B. Therefore, unnecessary deformation of the flanges 64A and 64B can be suppressed, and the press-formed product 60 with high dimensional accuracy can be manufactured.
  • the rising process (the first rising process and the second rising process) is performed after the projections 65A and 65B are formed in the burring forming process.
  • the punch 310, the die pad 320, and the die 300 of the press forming device 300 relatively move only in the pressing direction P, which is a straight line direction, so that the work 50 is moved between the pre-flange portions 54A and 54B.
  • the workpiece 50 can be formed into the press-formed product 60 by a simple construction method using simple operations of the punch 310 , the die pad 320 and the die 300 . As a result, there is no need to perform burring that requires many additional steps after the rising step.
  • step S3 the burring process can be completed with one process or a minimum of multiple processes.
  • the inventor of the present application provided the first flange forming portions 313A and 313B and the second flange forming portions 324A and 324B in the second start-up process using the press forming apparatus 300, so that the pair of flanges 64A and 64B A computer simulation was performed on the effect of suppressing the occurrence of distortion.
  • the configuration in which the second rising step is performed using the press forming apparatus 300 of the present embodiment is taken as an example, and the wide portion 323 (second flange forming portions 324A and 324B) is not provided. Except for this, the same configuration as the example was used as a comparative example.
  • the press-formed product 60 has a tensile strength of 780 MPa and a plate thickness of 2.3 mm
  • the press-formed product 60 which is the product of the example
  • the press-formed product which is the product of the comparative example
  • the one end 641A is displaced from the other end 642A by about 1.26 mm
  • the one end 641B is displaced from the other end 642B by about 1.26 mm.
  • such positional deviation does not occur, and distortion of the shape of the flanges 64A, 64B when the pair of pre-flange portions 54A, 54B are formed into the pair of flanges 64A, 64B is significantly suppressed. did it.
  • the first flange forming portions 313A and 313B of the press forming device 300 are arranged between one end (lower end) of the pair of pre-flange portions 54A and 54B, and the second flange forming portion
  • the portions 324A and 324B are arranged between the other ends (upper ends) of the pair of pre-flange portions 54A and 54B.
  • first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B are arranged between the flanges 64A, 64B at locations where the flanges 64A, 64B are most likely to be distorted, thereby suppressing this distortion. , the dimensional accuracy of the flanges 64A and 64B can be increased.
  • the stopper 314 can receive the pair of protrusions 65A and 65B between the pair of protrusions 65A and 65B in the second rising process. As a result, the distance between the pair of protrusions 65A and 65B does not become excessively narrow with respect to the required dimensions of the component, and the dimensional accuracy of the press-formed product 60 can be increased.
  • the second flange forming portions 324A and 324B of the press forming device 300 are positioned near the planned base portion 51 in the pressing direction P (the portion on the second direction P2 side). are placed. According to this configuration, the configuration in which the die pad 320 is provided with the second flange forming portions 324A and 324B can be easily realized.
  • the tip surface 314a of the stopper 314 of the press forming device 300 is arranged at a position recessed from the tip of the punch 310 on the die pad 320 side (the upper end, the base forming portion 315).
  • the second flange forming portions 324A and 324B can be arranged at positions advanced from the base forming portion 315 of the punch 310 toward the first direction P1 side of the pressing direction P. As shown in FIG. As a result, the second flange forming portions 324A, 324B can receive the pair of flanges 64A, 64B at positions closer to the stopper 314 arranged between the convex portions 65A, 65B.
  • the area where the second flange forming portions 324A, 324B and the opposing surfaces 64aA, 64aB of the pair of flanges 64A, 64B face each other can be increased.
  • the effect of suppressing the distortion of the pair of flanges 64A, 64B by the second flange forming portions 324A, 324B can be enhanced.
  • the first flange forming portions 313A and 313B are provided on the punch 310, and the second flange forming portions 324A and 324B are provided on the die pad 320. According to this configuration, there is no need to provide a dedicated mold for the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B. Furthermore, in this embodiment, the stopper 314 is provided on the punch 310 . Therefore, it is not necessary to provide a dedicated mold for the stopper 314 as well.
  • the workpiece 50 is formed from the intermediate molded product 40 by the first rising process using the press molding device 200, and then the second rising process using the press molding device 300.
  • a press-formed product 60 was formed from the workpiece 50 .
  • the intermediate product 40 may be formed into the press-formed product 60 by one rising process using the press-forming device 300.
  • FIG. 14 the intermediate molded product 40 becomes the workpiece 50 for a short period of time in the middle of the transition from the intermediate molded product 40 to the press molded product 60, and then the workpiece 50 becomes the press molded product 60 as the press operation progresses. .
  • the configuration in which the projecting portions 65A and 65B are formed respectively on the pre-flange portions 64A and 64B of the workpiece 50 is not limited, and the projecting portion 65A or the protruding portion 65B is formed on only one of the pre-flange portions 64A and 64B.
  • the convex portions 65A and 65B of the workpiece 50 are not limited to being formed by burring.
  • the protrusions 65A and 65B may be formed by attaching parts to the workpiece 50 such as weld nuts.
  • the projections may be formed by expanding the material by press molding the workpiece or the like.
  • the present invention can be applied as a press molding device and a method for manufacturing a press molded product.

Abstract

A press-forming apparatus 300 comprises a die 330, a punch 310, and a die pad 320. The die pad 320 is disposed inside the die 330. The die pad 320 is disposed so as to face the punch 310. At a molding bottom dead point PL, holes 400A, 400B are formed in a surface (first and second flange molding parts 313A, 313B, 324A, 324B) along a pressing direction P of the punch 310 and the die pad 320. At the molding bottom dead point PL, said surface faces the die 330. Rims 400aA, 400aB of the holes 400A, 400B are constituted by the die pad 320 and the punch 310.

Description

プレス成形装置、およびプレス成形品の製造方法PRESS MOLDING APPARATUS AND METHOD OF MANUFACTURING PRESS MOLDED PRODUCT
　本発明は、プレス成形装置、およびプレス成形品の製造方法に関する。 The present invention relates to a press molding device and a method of manufacturing a press molded product.
　鋼板をプレス成形することで得られるプレス成形品として、例えば、自動車サスペンションアームを挙げることができる（例えば、特許文献１，２参照）。自動車サスペンションアームについては、自動車の商品性向上、長寿命化、近年のＣＯ２排出量の削減要請、および原動機の電動化に伴う航続距離確保の観点から、部品要求性能(強度、および剛性)の向上と軽量化の両立が求められている。自動車部品を軽量化する有効な手段としては材料の高強度化（ハイテン化）による板厚削減に加え、プレス成形品の周辺付帯部品との機能統合による一体化(部品省略)を挙げることができる。 An example of a press-molded product obtained by press-molding a steel plate is an automobile suspension arm (see, for example, Patent Documents 1 and 2). Regarding automobile suspension arms, from the viewpoint of improving the marketability of automobiles, extending the life of automobiles, reducing CO2 emissions in recent years, and ensuring cruising distance due to the electrification of prime movers, the required performance (strength and rigidity) of parts has been improved. Both improvement and weight reduction are required. Effective ways to reduce the weight of automotive parts include reducing the plate thickness by increasing the strength of the material (high-tensile strength), as well as integrating the functions of the press-formed product with peripheral accessory parts (parts omitted). .
　上述のサスペンションアームについては、アーム端部の一対のフランジにバーリング成形部を対向位置することで、サスペンションアームと車体側との締結を担うカラー部品を省略したカラー一体構造型の開発が進められている。しかしながら、現状の量産プレス成形工程制約内において、このような構造の量産には困難が伴う。 Regarding the above-mentioned suspension arm, a collar-integrated structure type is being developed in which the collar part responsible for fastening the suspension arm and the vehicle body is omitted by locating the burring molded part facing the pair of flanges at the end of the arm. there is However, it is difficult to mass-produce such a structure within the constraints of the current mass-production press molding process.
　上記の困難が伴う理由としては、対向配置されたバーリング成形部の成形性にある。一対のフランジ、すなわち、２箇所の縦壁部分が対向した配置でバーリング成形を行う構成が、特許文献１に記載されている。特許文献１には、断面Ｕ字状のワークの２つのフランジ部に、互いに対向するバーリング穴を加工するための金型が開示されている。この金型は、２つのフランジ部（Ｆｂ，Ｆｂ）を挟むように配置される一対のバーリングポンチ（３２，３３）と、２つのフランジ部（Ｆｂ，Ｆｂ）間に配置される一対の半円状のスライドダイ（５，６）であって互いに組み合わされることでダイ穴（２７）形成する一対のスライドダイ（５，６）とを有する。そして、バーリングポンチ（３２，３３）が２つのフランジ部（Ｆｂ，Ｆｂ）を貫通してダイ穴（２７）に到達することで、２つのフランジ部（Ｆｂ，Ｆｂ）における２つのバーリング穴（Ｂ，Ｂ）の成形を同時に行う。バーリング穴（Ｂ，Ｂ）の成形後は、バーリングポンチ（３２，３３）を互いに遠ざかる方向に移動させるとともに、スライドダイ（５，６）を互いに遠ざかる方向に移動させる。その後、ワーク（Ｗ）がバーリング成形金型から上方に抜き取られる。しかしながら、このような構成では、バーリング成形金型を種々の方向に動作させる必要がある。このため、金型設計が複雑化するとともに、少なくとも２～４点以上の多工程が必要となり、既存制約内での工程数配置が困難となる。 The reason for the above difficulties lies in the formability of the burring formed parts that are arranged oppositely. Patent Document 1 describes a configuration in which burring is performed with a pair of flanges, that is, two vertical wall portions facing each other. Patent Literature 1 discloses a mold for forming opposing burring holes in two flange portions of a workpiece having a U-shaped cross section. This mold includes a pair of burring punches (32, 33) arranged to sandwich two flanges (Fb, Fb) and a pair of semicircles arranged between the two flanges (Fb, Fb). a pair of slide dies (5, 6) which are shaped like slide dies (5, 6) and are combined with each other to form a die hole (27). Then, the two burring holes (B , B) are carried out at the same time. After forming the burring holes (B, B), the burring punches (32, 33) are moved away from each other, and the slide dies (5, 6) are moved away from each other. After that, the workpiece (W) is extracted upward from the burring mold. However, such a configuration requires movement of the burring mold in various directions. This complicates the mold design and requires at least two to four or more steps, making it difficult to arrange the number of steps within the existing restrictions.
特許第３６７４２８７号Patent No. 3674287 特開２０１２－１８８０７６号公報JP 2012-188076 A
　より少ない工程で一対のフランジのそれぞれにバーリング成形部を形成する方法として、特許文献１に記載のようなバーリング成形加工を施すのではなく、一対のフランジを立上成形する前段階の平らな板状素材にバーリング成形を施す方法がある（例えば、特許文献２参照）。このようなバーリング成形方法であれば、バーリング成形の後に平らな板状素材の一部を立ち上げてフランジを成形する。よって、バーリング金型のパンチとダイを多方向に動作させる構成が不要となるため、バーリング成形工程を１工程で済ますことができ、制約のある既存設備内でのバーリング成形加工が、大幅なコスト上昇を招かずに可能となる。 As a method of forming a burring formed portion on each of a pair of flanges in a fewer number of steps, a flat plate is used in the stage prior to forming the pair of flanges upright instead of applying the burring forming process as described in Patent Document 1. There is a method of performing burring molding on a shaped material (see, for example, Patent Document 2). With such a burring method, after burring, a portion of the flat plate-shaped material is raised to form the flange. This eliminates the need for a structure that moves the punches and dies of the burring mold in multiple directions, so the burring process can be completed in a single process. It is possible without incurring an increase.
　但し、バーリング成形の後に素材の一部を立ち上げて一対のフランジを成形する方法では、バーリング成形後に、バーリング成形部を含む箇所を立ち上げ成形して一対のフランジを成形する必要がある。素材の一部を曲げて一対のフランジを立ち上げる立上工程において、バーリング成形部(フランジ)と金型との干渉を防ぎ、また最終工程後の金型からのプレス成形品の分離をはかるため、上下金型間に空洞箇所を配置する必要がある。この空洞箇所では、プレス成形品を上下金型できっちり挟み込むことができない。その結果、立上成形後に、空洞箇所に対向する箇所において形状のずれ、ゆがみが発生する可能性があり、サスペンションアームに求められる形状精度確保の課題解決が必要である。 However, in the method of forming a pair of flanges by raising part of the material after burring, it is necessary to form a pair of flanges by raising and forming the part including the burring formed part after burring. To prevent interference between the burring forming part (flange) and the die during the start-up process of bending a part of the material to raise a pair of flanges, and to separate the press-formed product from the die after the final process. , it is necessary to place a cavity between the upper and lower molds. At this hollow portion, the press-molded product cannot be tightly sandwiched between the upper and lower molds. As a result, there is a possibility that the portion facing the hollow portion may be deformed or distorted after the rise molding, and it is necessary to solve the problem of securing the shape accuracy required for the suspension arm.
　同様の課題は、サスペンションアームに限らず、他の製品として用いられるプレス成形品にも存在する。このような背景を踏まえ、本発明の目的の一つは、より簡素な工法で寸法精度の高いプレス成形品を製造することのできる、プレス成形装置、およびプレス成形品の製造方法を提供することにある。 Similar issues exist not only for suspension arms, but also for press-molded products used as other products. In light of this background, one of the objects of the present invention is to provide a press-molding apparatus and a method of manufacturing a press-molded product that can manufacture a press-molded product with high dimensional accuracy using a simpler method. It is in.
　本発明は、下記のプレス成形装置、およびプレス成形品の製造方法を要旨とする。 The gist of the present invention is the following press-molding apparatus and method for manufacturing a press-molded product.
　（１）ダイとパンチとダイパッドを備え、
　前記ダイパッドは前記ダイの内側に配置され、
　前記ダイパッドは前記パンチと対向して配置され、
　成形下死点において、前記ダイパッドと前記パンチのプレス方向に沿った面に穴があり、
　前記成形下死点において、前記面は前記ダイと向かい合い、
　前記穴の縁部は前記ダイパッドと前記パンチによって構成される
プレス成形装置。 (1) comprising a die, a punch and a die pad;
the die pad is positioned inside the die;
The die pad is arranged to face the punch,
At the bottom dead center of molding, the die pad and the punch have a hole in the plane along the pressing direction,
at the forming bottom dead center, the surface faces the die;
A press molding device in which the edge of the hole is formed by the die pad and the punch.
　（２）前記（１）に記載のプレス成形装置を使用し、
　前記パンチと前記ダイパッドでワークを挟むこと、
　前記パンチと前記ダイとを前記プレス方向に接近させること、
を備え、
　前記ワークは前記パンチ側の面に凸部を備え、
　前記成形下死点において、前記凸部は前記穴の中にあり、
　前記穴の中にある前記凸部の周囲のワークは前記ダイパッドと前記パンチの前記プレス方向に沿った前記面と前記ダイとに挟まれ、
　前記穴の中にある前記凸部と前記ダイパッドの間には前記ワークが無い、
プレス成形品の製造方法。 (2) Using the press molding device described in (1) above,
sandwiching the workpiece between the punch and the die pad;
bringing the punch and the die closer together in the pressing direction;
with
The workpiece has a convex portion on the punch side surface,
at the molding bottom dead center, the protrusion is in the hole;
The workpiece around the protrusion in the hole is sandwiched between the die pad and the surface of the punch along the pressing direction and the die;
There is no workpiece between the convex portion in the hole and the die pad,
A method for manufacturing a press-molded product.
　本発明によれば、より簡素な工法で寸法精度の高いプレス成形品を製造することができる。 According to the present invention, a press-formed product with high dimensional accuracy can be manufactured by a simpler method.
図１は、本発明の一実施形態に係るプレス成形品の模式的な斜視図である。FIG. 1 is a schematic perspective view of a press-formed product according to one embodiment of the present invention. 図２（Ａ）は、プレス成形品の正面図であり、図２（Ｂ）は、プレス成形品の平面図であり、図２（Ｃ）は、プレス成形品の側面図である。2(A) is a front view of the press-formed product, FIG. 2(B) is a plan view of the press-formed product, and FIG. 2(C) is a side view of the press-formed product. 図３（Ａ）は、ブランクの模式的な平面図である。図３（Ｂ）は、中間成形品の模式的な平面図である。FIG. 3A is a schematic plan view of the blank. FIG. 3(B) is a schematic plan view of an intermediate molded product. 図４は、中間成形品およびバーリング成形用のプレス成形装置を示す模式的な斜視図である。FIG. 4 is a schematic perspective view showing an intermediate molded product and a press molding apparatus for burring molding. 図５（Ａ）は、トリム加工前の中間成形品の模式的な平面図であり、図５（Ｂ）は、トリム加工後の中間成形品の模式的な平面図である。FIG. 5A is a schematic plan view of the intermediate molded product before trimming, and FIG. 5B is a schematic plan view of the intermediate molded product after trimming. 図６は、第１立上工程用のプレス成形装置および中間成形品の主要部の模式的な斜視図である。FIG. 6 is a schematic perspective view of the main part of the press molding device for the first rising step and the intermediate molded product. 図７（Ａ）および図７（Ｂ）は、それぞれ、ワークの横断面図であり、図７（Ｃ）は、ワークの変形例を示す図である。7A and 7B are cross-sectional views of the work, and FIG. 7C is a diagram showing a modification of the work. 図８は、第２立上工程用のプレス成形装置およびワークの主要部の模式的な斜視図である。FIG. 8 is a schematic perspective view of the main part of the press forming apparatus and work for the second start-up process. 図９は、第２立上工程用のプレス成形装置の成形下死点での主要部の側面図である。FIG. 9 is a side view of the main part of the press forming apparatus for the second rising process at the forming bottom dead center. 図１０（Ａ）～図１０（Ｃ）は、それぞれ、第２立上工程用のプレス成形装置の成形下死点での主要部の変形例の長手方向と高さ方向に沿った縦断面図である。FIGS. 10(A) to 10(C) are vertical cross-sectional views along the longitudinal direction and the height direction of a modification example of the main part at the forming bottom dead center of the press forming apparatus for the second start-up process. is. 図１１は、第２立上工程用のプレス成形装置の主要部をプレス成形装置の横断面で示した図であって、成形上死点にある状態を示している。FIG. 11 is a cross-sectional view of the main part of the press forming apparatus for the second rising process, showing the state at the top dead center of forming. 図１２は、第２立上工程用のプレス成形装置の主要部をプレス成形装置の横断面で示した図であって、成形下死点にある状態を示している。FIG. 12 is a cross-sectional view of the main part of the press forming apparatus for the second rising process, showing the state at the forming bottom dead center. 図１３は、第２立上工程用のプレス成形装置における幅広部の両端部の変形例を示す図である。FIG. 13 is a diagram showing a modification of both ends of the wide portion in the press forming apparatus for the second rising process. 図１４は、変形例に関する立上工程用のプレス成形装置の主要部をプレス成形装置の横断面で示した図であって、成形下死点ＰＬにある状態を示している。FIG. 14 is a cross-sectional view of the main part of the press forming apparatus for the start-up process according to the modification, showing a state at the forming bottom dead center PL.
　以下に添付図面とともに、本発明の好適な実施の形態について詳細に説明する。なお、本明細書および図面において、実質的に同一の機能構成を有する構成要素については、同様の符号を付することにより重複説明を省略する。 A preferred embodiment of the present invention will be described in detail below along with the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same functional configuration are denoted by the same reference numerals, thereby omitting redundant description.
＜実施形態＞
　まず、本発明の一実施形態に係るプレス成形品について説明する。図１は、本発明の一実施形態に係るプレス成形品６０の模式的な斜視図である。図２（Ａ）は、プレス成形品６０の正面図であり、図２（Ｂ）は、プレス成形品６０の平面図であり、図２（Ｃ）は、プレス成形品６０の側面図である。 <Embodiment>
First, a press-formed product according to one embodiment of the present invention will be described. FIG. 1 is a schematic perspective view of a press-formed product 60 according to one embodiment of the present invention. 2(A) is a front view of the press-formed product 60, FIG. 2(B) is a plan view of the press-formed product 60, and FIG. 2(C) is a side view of the press-formed product 60. .
　＜プレス成形品６０の構成＞
　図１～図２（Ｃ）に示すように、プレス成形品６０は、自動車の構造部品である。このような構造部品としては、例えば、シャシ部品が挙げられる。シャシ部品としては、例えば、サスペンション部品のアームあるいはリンク部品があり、具体的にはロアアーム、フロントアッパーアーム、リアアッパーアーム、トレーリングアーム等がある。 <Structure of press-molded product 60>
As shown in FIGS. 1 to 2C, the press-formed product 60 is a structural component of an automobile. Such structural components include, for example, chassis components. Chassis parts include, for example, arms or link parts of suspension parts, specifically lower arms, front upper arms, rear upper arms, trailing arms, and the like.
　本実施形態では、プレス成形品６０がサスペンションアームである形態を例に説明する。より具体的には、本実施形態では、プレス成形品６０がリアロアアームである形態を例に説明する。 In this embodiment, an example in which the press-molded product 60 is a suspension arm will be described. More specifically, in this embodiment, an example in which the press-formed product 60 is a rear lower arm will be described.
　プレス成形品６０は、本実施形態では、１枚の鋼板を複数回プレス成形することで形成された、開断面を有する板部材である。プレス成形品６０を構成する鋼板として、高強度熱延鋼板、熱延原板溶融亜鉛めっき鋼板等を例示できる。この鋼板の引張強さは、例えば、４４０ＭＰａ以上であり、例えば、５９０ＭＰａ以上であり、例えば、７８０ＭＰａ以上である。鋼板の引張強さが高いほど、プレス成形品６０を成形する際の成形性は低下する傾向にある。プレス成形品６０の板厚は、例えば、１．６ｍｍ～４．０ｍｍである。 In this embodiment, the press-formed product 60 is a plate member having an open cross section formed by press-forming a single steel plate multiple times. Examples of the steel sheet forming the press-formed product 60 include a high-strength hot-rolled steel sheet, a hot-rolled hot-rolled hot-dip galvanized steel sheet, and the like. The tensile strength of this steel plate is, for example, 440 MPa or more, for example, 590 MPa or more, for example, 780 MPa or more. The higher the tensile strength of the steel sheet, the lower the formability of the press-formed product 60 tends to be. The plate thickness of the press-formed product 60 is, for example, 1.6 mm to 4.0 mm.
　プレス成形品６０は、本実施形態では、車両の左右方向に相当する方向を長手方向Ｘ１として細長いストレート形状に形成されている。なお、プレス成形品６０は、ストレート形状に限らず、溝形状、Ａ字状等の他の形状に形成されていてもよい。 In this embodiment, the press-formed product 60 is formed in an elongated straight shape with the longitudinal direction X1 being the direction corresponding to the left-right direction of the vehicle. In addition, the press-formed product 60 is not limited to a straight shape, and may be formed in other shapes such as a groove shape and an A-shape.
　プレス成形品６０は、ベース６１およびこのベース６１に連続する一対の縦壁６３Ａ，６３Ｂを有する横断面溝形形状の本体６２と、一対の縦壁６３Ａ，６３Ｂとは長手方向Ｘ１の一方に隣接し互いに対向配置された一対のフランジ６４Ａ，６４Ｂと、これら一対のフランジ６４Ａ，６４Ｂの互いの対向面６４ａＡ，６４ａＢそれぞれに設けられた一対の凸部６５Ａ，６５Ｂと、一対の縦壁６３Ａ，６３Ｂとは長手方向Ｘ１の他方に隣接し互いに対向配置された一対のフランジ６６Ａ，６６Ｂと、これら一対のフランジ６６Ａ，６６Ｂの互いの対向面６７ａＡ，６７ａＢそれぞれに設けられた一対の凸部６７Ａ，６７Ｂと、を有している。縦壁とはベースに対して起立している壁という意味であって、直立していることに限定されない。 The press-formed product 60 includes a main body 62 having a channel-shaped transverse cross section and having a base 61 and a pair of vertical walls 63A and 63B continuous with the base 61, and the pair of vertical walls 63A and 63B are adjacent to each other in the longitudinal direction X1. A pair of flanges 64A and 64B arranged to face each other, a pair of protrusions 65A and 65B provided on the opposing surfaces 64aA and 64aB of the pair of flanges 64A and 64B, and a pair of vertical walls 63A and 63B. A pair of flanges 66A and 66B adjacent to the other in the longitudinal direction X1 and opposite to each other, and a pair of projections 67A and 67B provided on surfaces 67aA and 67aB of the pair of flanges 66A and 66B facing each other. and have A vertical wall means a wall that stands up against a base, and is not limited to being upright.
　本体６２が断面溝形形状であることにより、プレス成形品６０は、開断面部材である。開断面とは、長手方向Ｘ１と直交する横断面において閉じた形状が形成されておらず断面形状における周方向において端部が存在していることをいう。本体６２は、溝形形状であればよい。溝形形状には、たとえば断面ハット形状などのフランジのある形状や断面Ｕ字形状などの溝底部が湾曲した形状も含まれる。 The press-formed product 60 is an open cross-section member because the main body 62 has a grooved cross-section. An open cross-section means that a cross-section perpendicular to the longitudinal direction X1 does not have a closed shape and ends in the circumferential direction of the cross-sectional shape. The main body 62 may have a channel shape. The groove shape includes, for example, a shape with a flange such as a hat-shaped cross section and a shape with a curved groove bottom such as a U-shaped cross section.
　ベース６１は、本実施形態では、長手方向Ｘ１に真っ直ぐな形状で且つ扁平な形状に形成されている。なお、ベース６１は、真直形状でなくてもよく、横断面で例えばＣ形状等であってもよい。また、ベース６１は、長手方向Ｘ１の端部に進むにしたがいベース６１の板厚方向の一方に向かって傾斜した部分を含んでいてもよい。長手方向Ｘ１におけるベース６１の一端は、一対のフランジ６４Ａ，６４Ｂに隣接するベース部縁部６１ａを有している。ベース部縁部６１ａを通る横断面は、湾曲部６１ｂと直線部６１ｃと湾曲部６１ｄが連続した形状に形成されている。長手方向Ｘ１と直交する短手方向Ｙ１におけるベース部縁部６１ａの端部は、ベース６１のうちフランジ６４Ａ，６４Ｂとの境界部分である。一対の縦壁６３Ａ，６３Ｂ間におけるベース部縁部６１ａの長さは、長さＬｐである。短手方向Ｙ１におけるベース６１の一対の端部から、一対の縦壁６３Ａ，６３Ｂが延びている。 In this embodiment, the base 61 is straight in the longitudinal direction X1 and formed in a flat shape. Note that the base 61 may not have a straight shape, and may have, for example, a C shape in cross section. Also, the base 61 may include a portion that is inclined toward one side in the thickness direction of the base 61 toward the end in the longitudinal direction X1. One end of the base 61 in the longitudinal direction X1 has a base edge 61a adjacent to a pair of flanges 64A, 64B. A cross section passing through the base portion edge portion 61a is formed in a shape in which a curved portion 61b, a straight portion 61c, and a curved portion 61d are continuous. An end portion of the base portion edge portion 61a in the lateral direction Y1 perpendicular to the longitudinal direction X1 is a boundary portion of the base 61 between the flanges 64A and 64B. The length of the base portion edge portion 61a between the pair of vertical walls 63A and 63B is the length Lp. A pair of vertical walls 63A and 63B extend from a pair of ends of the base 61 in the lateral direction Y1.
　一対の縦壁６３Ａ，６３Ｂと、ベース６１は溝部を形成している。更に、溝部を通る横断面は開断面である。本実施形態では、ベース６１に対する各縦壁６３Ａ，６３Ｂの角度θは、０＜θ≦９０度の範囲内であればよい。本実施形態では、各縦壁６３Ａ，６３Ｂは、ベース６１の表面６１ｅおよび裏面６１ｆのうちの裏面６１ｆ側（高さ方向Ｚ１の下側）に延びている。 A pair of vertical walls 63A, 63B and the base 61 form a groove. Furthermore, the cross section through the groove is an open section. In this embodiment, the angle θ of each vertical wall 63A, 63B with respect to the base 61 may be within the range of 0<θ≦90 degrees. In this embodiment, each of the vertical walls 63A and 63B extends toward the rear surface 61f of the front surface 61e and the rear surface 61f of the base 61 (below the height direction Z1).
　一対のフランジ６４Ａ，６４Ｂは、本実施形態では、平行に配置されている。本実施形態では、ベース６１に対する各フランジ６４Ａ，６４Ｂの角度は、角度θと同じである。ベース６１と各フランジ６４Ａ，６４Ｂのなす角度は同じでなくてもよいし、フランジ６４Ａ，６４Ｂは平行でなくてもよい。本実施形態では、各フランジ６４Ａ，６４Ｂは、側面視で円環状に形成されているけれども、楕円環形状であってもよいし、多角環状であってもよい。すなわち、各フランジ６４Ａ，６４Ｂの輪郭形状に特に制約は無い。 The pair of flanges 64A, 64B are arranged in parallel in this embodiment. In this embodiment, the angle of each flange 64A, 64B with respect to the base 61 is the same as the angle θ. The angles formed by the base 61 and the flanges 64A and 64B may not be the same, and the flanges 64A and 64B may not be parallel. In the present embodiment, each of the flanges 64A and 64B is formed in an annular shape when viewed from the side, but may have an elliptical ring shape or a polygonal ring shape. That is, there are no particular restrictions on the contour shape of each of the flanges 64A and 64B.
　本実施形態では、長手方向Ｘ１および短手方向Ｙ１に直交する方向が、高さ方向Ｚ１である。平面視において、一対のフランジ６４Ａ，６４Ｂ間の隙間６８を視認可能なように、一対のフランジ６４Ａ，６４Ｂ間の少なくとも一部は、ベース６１によって覆われていない。すなわち、長手方向Ｘ１において、ベース６１の縁部６１ａは、凸部６５Ａ，６５Ｂの配置箇所の手前で切り欠かれている。この構成であれば、プレス成形品６０を製造する際、鋼板素材であるワークにおいてベース予定部に対して一対の縦壁予定部を曲げることで一対のフランジ予定部を一対のフランジ６４Ａ，６４Ｂに成形するときに、高さ方向Ｚ１における一対のフランジ６４Ａ，６４Ｂの両側から金型を挿入できる。これにより、一対のフランジ６４Ａ，６４Ｂ間の距離を所望の値に高い精度で設定できる。予定部とはプレス成形品６０の特定の部位になるワークの部位を意味する。プレス成形品６０の製造方法の詳細は、後述する。好ましくは、一対のフランジ６４Ａ，６４Ｂのうち、高さ方向Ｚ１におけるベース６１側の上下端部間は、ベース６１によって覆われていないことにより高さ方向Ｚ１に開放されていることが好ましい。より好ましくは、本実施形態のように、一対のフランジ６４Ａ，６４Ｂ間の隙間６８は、長手方向Ｘ１における全域に亘って高さ方向Ｚ１に開放されていることが好ましい。 In this embodiment, the direction orthogonal to the longitudinal direction X1 and the lateral direction Y1 is the height direction Z1. In plan view, at least a portion between the pair of flanges 64A and 64B is not covered with the base 61 so that the gap 68 between the pair of flanges 64A and 64B is visible. That is, in the longitudinal direction X1, the edge 61a of the base 61 is notched before the location where the projections 65A and 65B are arranged. With this configuration, when the press-formed product 60 is manufactured, the pair of planned flange portions are bent to the pair of flanges 64A and 64B by bending the pair of planned vertical wall portions with respect to the planned base portion of the workpiece that is a steel plate material. When molding, molds can be inserted from both sides of the pair of flanges 64A and 64B in the height direction Z1. Thereby, the distance between the pair of flanges 64A and 64B can be set to a desired value with high accuracy. A planned portion means a portion of the work that becomes a specific portion of the press-formed product 60 . The details of the method of manufacturing the press-formed product 60 will be described later. Preferably, between the upper and lower ends of the pair of flanges 64A and 64B on the side of the base 61 in the height direction Z1 is not covered with the base 61 and is open in the height direction Z1. More preferably, as in this embodiment, the gap 68 between the pair of flanges 64A and 64B is preferably open in the height direction Z1 over the entire area in the longitudinal direction X1.
　一対の凸部６５Ａ，６５Ｂは、図示しないブッシュをプレス成形品６０に取り付けるために設けられている。ブッシュは、図示しないボルト等を介して車体に連結される。本実施形態では、各凸部６５Ａ，６５Ｂは、対応するフランジ６４Ａ，６４Ｂとバーリング成形によって一体成形されており、対応するフランジ６４Ａ，６４Ｂに形成された孔部の縁部から対応するフランジ６４Ａ，６４Ｂの板厚方向に延びている。各凸部６５Ａ，６５Ｂは、フランジ６４Ａ，６４Ｂ間において円筒状に形成されている。一対の凸部６５Ａ，６５Ｂは、本実施形態では、互いに離隔している。 A pair of protrusions 65A and 65B are provided for attaching a bush (not shown) to the press-formed product 60. The bush is connected to the vehicle body via a bolt or the like (not shown). In this embodiment, each projection 65A, 65B is integrally formed with the corresponding flange 64A, 64B by burring molding, and the flange 64A, 65B is formed from the edge of the hole formed in the corresponding flange 64A, 64B. It extends in the plate thickness direction of 64B. Each convex portion 65A, 65B is formed in a cylindrical shape between flanges 64A, 64B. The pair of protrusions 65A and 65B are separated from each other in this embodiment.
　なお、本実施形態では、プレス成形品６０は、長手方向Ｘ１に対称な形状に形成されている。よって、一対のフランジ６６Ａ，６６Ｂおよび一対の凸部６７Ａ，６７Ｂの構成は、一対のフランジ６４Ａ，６４Ｂおよび一対の凸部６５，６５と同様であるので、詳細な説明を省略する。 Note that, in the present embodiment, the press-formed product 60 is formed in a shape symmetrical with respect to the longitudinal direction X1. Therefore, the configurations of the pair of flanges 66A, 66B and the pair of projections 67A, 67B are the same as those of the pair of flanges 64A, 64B and the pair of projections 65, 65, so detailed description thereof will be omitted.
　＜プレス成形品の製造方法、およびプレス成形品を製造するためのプレス成形装置の構成＞
　次に、プレス成形品６０の製造方法の一例、およびプレス成形品６０を製造するためのプレス成形装置１００，２００，３００の構成の一例を説明する。プレス成形品６０の製造方法は、鋼板からブランクを切り出すブランキング工程（ステップＳ１）と、ブランクからバーリング成形用の下孔を成形する下孔成形工程（ステップＳ２）と、下孔が成形された中間成形品にバーリング加工を施して凸部を成形するバーリング成形工程（ステップＳ３）と、凸部が成形されたバーリング加工済素材である中間成形品の周囲をトリムするトリム工程（ステップＳ４）と、トリム加工された中間成形品をプレス成形品６０のワークに仕上げる第１立上工程（ステップＳ５）と、ワークをプレス成形品６０に仕上げる第２立上工程（ステップＳ６）と、を有している。なお、本実施形態では、第１立上工程（ステップＳ５）と第２立上工程（ステップＳ６）は、まとめて立上工程ともいう。立上工程は、中間成形品からワークを成形しさらにワークをプレス成形品６０に成形する工程である。各工程は必ずしも連続して行う必要はない。例えば、ブランクを購入して立ち上げ工程をしてもよい。 <Method for producing press-formed product, and configuration of press-forming apparatus for producing press-formed product>
Next, an example of a method for manufacturing the press-formed product 60 and an example of the configuration of the press-forming apparatuses 100, 200, and 300 for manufacturing the press-formed product 60 will be described. The method of manufacturing the press-formed product 60 includes a blanking step (step S1) of cutting a blank from a steel plate, a pilot hole forming step (step S2) of forming a pilot hole for burring forming from the blank, and a pilot hole forming step (step S2). A burring step (step S3) in which the intermediate molded product is burred to form a convex portion, and a trimming step (step S4) in which the periphery of the intermediate molded product, which is a burred material with the convex portion formed, is trimmed. , a first start-up step (step S5) of finishing the trimmed intermediate product into a work of the press-formed product 60, and a second start-up step (step S6) of finishing the work into the press-formed product 60. ing. In this embodiment, the first rising process (step S5) and the second rising process (step S6) are collectively referred to as the rising process. The start-up process is a process of forming a work from an intermediate formed product and further forming the work into a press-formed product 60 . Each step does not necessarily have to be performed continuously. For example, a blank may be purchased and the start-up process performed.
　なお、本実施形態では、プレス成形品６０の製造方法としてトリム工程（ステップＳ４）を含む例を説明するが、トリム工程（ステップＳ４）を省略してもよい。例えば、プレス成形品６０が、ブランキング工程（ステップＳ１）でプレス成形品６０の形状に対応する正確なラインでブランクを切り出しても欠肉（材料不足）や余りを生じずに成形できる簡易的な形状であれば、トリム工程（ステップＳ４）は省略できる。よって、トリム工程（ステップＳ４）は、必要に応じて適用されればよい。 In this embodiment, an example including a trimming step (step S4) is described as a method of manufacturing the press-formed product 60, but the trimming step (step S4) may be omitted. For example, the press-formed product 60 can be formed without underfill (insufficient material) or surplus even if the blank is cut along an accurate line corresponding to the shape of the press-formed product 60 in the blanking step (step S1). If the shape is good, the trimming process (step S4) can be omitted. Therefore, the trim process (step S4) may be applied as required.
　また、本実施形態では、プレス成形品６０の製造方法として第１立上工程（ステップＳ５）を含む例を説明するが、第１立上工程（ステップＳ５）を省略してもよい。例えば、第１立上工程（ステップＳ５）を省略する代わりに、トリム加工された中間成形品に、第２立上工程（ステップＳ６）で説明する加工を施すことで、中間成形品から１工程でワークを経てプレス成形品６０を成形してもよい。よって、第１立上工程（ステップＳ５）は、プレス成形品６０の成形難度等に基づいて必要に応じて適用されればよい。 Also, in this embodiment, an example including the first start-up process (step S5) is described as a method of manufacturing the press-formed product 60, but the first start-up process (step S5) may be omitted. For example, instead of omitting the first start-up step (step S5), the trimmed intermediate molded product is subjected to the processing described in the second start-up step (step S6), so that one step from the intermediate molded product , the press-formed product 60 may be formed through the work. Therefore, the first start-up step (step S5) may be applied as necessary based on the degree of difficulty in forming the press-formed product 60 and the like.
　＜ブランキング工程（ステップＳ１）＞
　ブランキング工程では、まず、図示しない鋼板が用意され、この鋼板からブランク１０がプレス加工等によって切り出される。図３（Ａ）は、ブランク１０の模式的な平面図である。ブランク１０は、プレス成形品６０を展開した形状に概ね相似する外郭形状を有し、且つ、凸部６５Ａ，６５Ｂ，６７Ａ，６７Ｂが形成される箇所が平坦な形状に相当する。 <Blanking Step (Step S1)>
In the blanking process, first, a steel plate (not shown) is prepared, and blanks 10 are cut out from the steel plate by press working or the like. FIG. 3A is a schematic plan view of the blank 10. FIG. The blank 10 has an outline shape that is generally similar to the unfolded shape of the press-formed product 60, and the portions where the convex portions 65A, 65B, 67A, and 67B are formed correspond to a flat shape.
　＜下孔成形工程（ステップＳ２）＞
　下孔形成工程では、ブランク１０に下孔１１Ａ，１１Ｂ，１２Ａ，１２Ｂが形成される。具体的には、図示しないパンチおよびダイ等を用いて、凸部６５Ａ，６５Ｂ，６７Ａ，６７Ｂが形成される箇所に、図３（Ｂ）に示すように下孔１１Ａ，１１Ｂ，１２Ａ，１２Ｂが形成される。これにより、ブランク１０は、中間成形品２０となる。図３（Ｂ）は、中間成形品２０の模式的な平面図である。なお、中間成形品は、ワークと同義であるが、本実施形態では、プレス成形品６０を成形する第２立ち上げ工程で加工される部品をワークといい、ワークとなるまでの加工対象部品を中間成形品という。 <Preparatory Hole Forming Step (Step S2)>
In the pilot hole forming step, pilot holes 11A, 11B, 12A, and 12B are formed in the blank 10 . Specifically, prepared holes 11A, 11B, 12A, and 12B are formed as shown in FIG. It is formed. Thereby, the blank 10 becomes the intermediate molded product 20 . FIG. 3B is a schematic plan view of the intermediate molded product 20. FIG. The term "intermediate molded product" has the same meaning as "work", but in the present embodiment, the part to be processed in the second start-up process for molding the press-formed product 60 is referred to as "work", and the part to be processed until it becomes the work is referred to as "work". It is called an intermediate molded product.
　＜バーリング成形工程（ステップＳ３）＞
　バーリング成形工程では、バーリング成形用のプレス成形装置１００を用いて中間成形品２０にバーリング成形を施す。図４は、中間成形品２０およびバーリング成形用のプレス成形装置１００を示す模式的な斜視図である。バーリング成形工程では、プレス成形品６０の素材である中間成形品２０に一対の凸部６５Ａ，６５Ｂおよび一対の凸部６７Ａ，６７Ｂを成形して中間成形品２０をバーリング加工済素材である中間成形品３０とする。 <Burling Step (Step S3)>
In the burring molding process, the intermediate molded product 20 is subjected to burring molding using a press molding device 100 for burring molding. FIG. 4 is a schematic perspective view showing an intermediate molded product 20 and a press molding apparatus 100 for burring molding. In the burring process, a pair of projections 65A and 65B and a pair of projections 67A and 67B are formed on an intermediate molded product 20 which is a material of a press molded product 60, and the intermediate molded product 20 is an intermediate molded product which is a burred material. Product 30.
　図４に示すように、プレス成形装置１００は、複数の第１金型１１０（パンチ）と、第２金型１２０（ブランクホルダ）と、第３金型１３０（ダイ）と、を有している。 As shown in FIG. 4, the press molding apparatus 100 has a plurality of first molds 110 (punches), second molds 120 (blank holders), and third molds 130 (dies). there is
　バーリング成形工程では、プレス成形装置１００の第３金型１３０の上に中間成形品２０が載せられる。次いで、第２金型１２０によって中間成形品２０が第３金型１３０に押さえられる。この状態で、第１金型１１０が第３金型１３０に向けて変位する。これにより、複数の第１金型１１０が中間成形品２０の下孔１１Ａ，１１Ｂ，１２Ａ，１２Ｂにバーリング加工を施し、中間成形品２０の長手方向両端部に凸部６５Ａ，６５Ｂ，６７Ａ，６７Ｂが成形される。中間成形品２０がプレス成形装置１００によってバーリング加工されることで、図５（Ａ）に示すように、中間成形品２０は、中間成形品３０となる。図５（Ａ）は、トリム加工前の中間成形品３０の模式的な平面図である。 In the burring molding process, the intermediate molded product 20 is placed on the third mold 130 of the press molding device 100 . Next, the intermediate molded product 20 is pressed against the third mold 130 by the second mold 120 . In this state, the first mold 110 is displaced toward the third mold 130 . As a result, the plurality of first molds 110 perform burring processing on the pilot holes 11A, 11B, 12A, and 12B of the intermediate molded product 20, and projecting portions 65A, 65B, 67A, and 67B are formed on both ends of the intermediate molded product 20 in the longitudinal direction. is molded. By burring the intermediate molded product 20 by the press molding device 100, the intermediate molded product 20 becomes an intermediate molded product 30 as shown in FIG. 5(A). FIG. 5A is a schematic plan view of the intermediate molded product 30 before trimming.
　＜トリム工程（ステップＳ４）＞
　トリム工程では、中間成形品３０の周囲をトリムする。このトリムは、図示しないプレス成形装置によって行われてもよいし、図示しないカッターによって行われてもよく、具体的な加工方法は限定されない。トリム工程を経ることで、図５（Ｂ）に示すように、中間成形品３０が中間成形品４０となる。図５（Ｂ）は、トリム加工後の中間成形品４０の模式的な平面図である。トリム加工前の中間成形品３０のうちトリム工程で切り取られた部分は、図５（Ｂ）において二点鎖線で示している。中間成形品４０の形状は、プレス成形品６０を平面形状に展開した展開図の形状に相当する。 <Trim process (step S4)>
In the trim process, the periphery of the intermediate molded product 30 is trimmed. This trimming may be performed by a press molding device (not shown) or by a cutter (not shown), and the specific processing method is not limited. Through the trimming process, the intermediate molded product 30 becomes an intermediate molded product 40 as shown in FIG. 5(B). FIG. 5B is a schematic plan view of the intermediate molded product 40 after trimming. A portion of the intermediate molded product 30 before trimming that has been cut out in the trimming process is indicated by a chain double-dashed line in FIG. 5(B). The shape of the intermediate molded product 40 corresponds to the shape of a developed view in which the press-molded product 60 is developed into a planar shape.
　＜第１立上工程（ステップＳ５）＞
　第１立上工程では、第１立上工程用のプレス成形装置２００を用いて中間成形品４０にプレス成形（第１立上成形）を行う。図６は、第１立上工程用のプレス成形装置２００および中間成形品４０の主要部の模式的な斜視図である。図７（Ａ）および図７（Ｂ）は、それぞれ、ワーク５０の横断面図である。図１、図６、図７（Ａ）、図７（Ｂ）、および後述する図８に示すように、第１立上工程では、中間成形品４０からワーク５０を成形する。 <First Rising Step (Step S5)>
In the first start-up process, press molding (first start-up molding) is performed on the intermediate molded product 40 using the press molding device 200 for the first start-up process. FIG. 6 is a schematic perspective view of the press molding device 200 for the first rising step and the main parts of the intermediate molded product 40. FIG. 7A and 7B are cross-sectional views of the workpiece 50, respectively. As shown in FIGS. 1, 6, 7(A), 7(B), and FIG. 8, which will be described later, in the first rising step, a workpiece 50 is molded from an intermediate molded product 40. As shown in FIG.
　ワーク５０は、ベース６１の予定部としてのベース予定部５１、一対の縦壁６３Ａ，６３Ｂの予定部として形成されベース予定部５１から立ち上がる一対の縦壁予定部５３Ａ，５３Ｂ、および一対のフランジ６４Ａ，６４Ｂの予定部としての一対のフランジ予定部５４Ａ，５４Ｂを有している。ワーク５０の横断面において、ベース予定部５１は例えば高さ方向Ｚ１の一方に凸となる湾曲形状である。一対の縦壁予定部５３Ａ，５３Ｂは、ワーク５０の短手方向Ｙ１におけるベース予定部５１の両端に隣接する平板状部分である。一対のフランジ予定部５４Ａ，５４Ｂは、一対の縦壁予定部５３Ａ，５３Ｂと長手方向Ｘ１に隣接する平板形状部分である。横断面においてベース予定部５１の短手方向Ｙ１両端が湾曲していることにより、縦壁予定部５３Ａ，５３Ｂと同一面上にある一対のフランジ予定部５４Ａ，５４Ｂは、短手方向Ｙ１に対向している。一対のフランジ予定部５４Ａ，５４Ｂには、一対のフランジ予定部５４Ａ，５４Ｂの互いの対向面５４ａＡ，５４ａＢのそれぞれに凸部６５Ａ，６５Ｂが配置されている。さらに、ワーク５０は、当該ワーク５０の長手方向Ｘ１に対称な形状に形成されていて、一対のフランジ６６Ａ，６６Ｂの予定部としての一対のフランジ予定部５６Ａ，５６Ｂを有していてもよい。ワーク５０の横断面において、縦壁予定部５３Ａ，５３Ｂの間隔がベース予定部５１から遠ざかるに従い、広くなっていてもよい。 The workpiece 50 includes a scheduled base portion 51 as a scheduled portion of the base 61, a pair of scheduled vertical wall portions 53A and 53B formed as scheduled portions of a pair of vertical walls 63A and 63B and rising from the scheduled base portion 51, and a pair of flanges 64A. , 64B. In the cross section of the workpiece 50, the pre-base portion 51 has, for example, a curved shape that protrudes in one direction in the height direction Z1. The pair of planned vertical wall portions 53A and 53B are plate-like portions adjacent to both ends of the planned base portion 51 in the transverse direction Y1 of the workpiece 50. As shown in FIG. The pair of pre-flange portions 54A and 54B are plate-shaped portions adjacent to the pair of pre-vertical wall portions 53A and 53B in the longitudinal direction X1. Since both ends of the planned base portion 51 in the transverse direction Y1 are curved in the cross section, the pair of planned flange portions 54A and 54B on the same plane as the planned vertical wall portions 53A and 53B face each other in the transverse direction Y1. are doing. Protrusions 65A and 65B are arranged on the pair of pre-flange portions 54A and 54B on opposing surfaces 54aA and 54aB of the pair of pre-flange portions 54A and 54B, respectively. Furthermore, the workpiece 50 may be formed in a shape symmetrical with respect to the longitudinal direction X1 of the workpiece 50 and have a pair of planned flange portions 56A and 56B as planned portions of the pair of flanges 66A and 66B. In the cross section of the workpiece 50, the interval between the planned vertical wall portions 53A and 53B may increase as the distance from the planned base portion 51 increases.
　プレス成形装置２００の金型は、水平方向としての長手方向Ｘ２に細長く、長手方向Ｘ２と直交する水平方向としての短手方向Ｙ２に短い形状であって、長手方向Ｘ２および短手方向Ｙ２に直交する高さ方向Ｚ２に複数の金型が並んだ構成である。長手方向Ｘ２、短手方向Ｙ２、および高さ方向Ｚ２は、プレス成形装置２００で中間成形品４０がワーク５０に成形されたときにおけるプレス成形装置２００上でのワーク５０の長手方向Ｘ１、短手方向Ｙ１、および高さ方向Ｚ１と一致している。高さ方向、上方向、下方向とはプレス方向のことである。水平方向とはプレス方向に垂直な方向である。プレス方向が鉛直方向であることが多いためこのように表現するが、本開示の水平方向は必ずしも鉛直方向に垂直な方向であることを意味しない。 The mold of the press molding apparatus 200 is elongated in a longitudinal direction X2 as a horizontal direction and short in a lateral direction Y2 as a horizontal direction perpendicular to the longitudinal direction X2. In this configuration, a plurality of molds are arranged in the height direction Z2. The longitudinal direction X2, the lateral direction Y2, and the height direction Z2 are the longitudinal direction X1 and the lateral direction of the work 50 on the press forming device 200 when the intermediate product 40 is formed into the work 50 by the press forming device 200. It coincides with the direction Y1 and the height direction Z1. The height direction, upward direction, and downward direction are press directions. The horizontal direction is the direction perpendicular to the pressing direction. Although the press direction is often vertical, the horizontal direction in this disclosure does not necessarily mean a direction perpendicular to the vertical direction.
　なお、プレス成形装置２００の金型は、長手方向Ｘ２に対称な形状に形成されていてもよい。そして、プレス成形装置２００の金型が中間成形品４０をワーク５０に成形する動作も、長手方向Ｘ２に対称である。よって、プレス成形装置２００におけるプレス動作については、長手方向Ｘ２の一方側での構成を主に説明し、長手方向Ｘ２の他方側の構成の詳細な説明を省略する。 The mold of the press molding device 200 may be formed in a shape symmetrical with respect to the longitudinal direction X2. The operation of the mold of the press molding device 200 to mold the intermediate molded product 40 into the workpiece 50 is also symmetrical with respect to the longitudinal direction X2. Therefore, regarding the press operation in the press forming apparatus 200, the configuration on one side in the longitudinal direction X2 will be mainly described, and the detailed description of the configuration on the other side in the longitudinal direction X2 will be omitted.
　プレス成形装置２００は、第１金型２１０（下金型、パンチ）と、第２金型２２０（ダイパッド）と、第３金型２３０（ダイ）と、を有している。 The press molding device 200 has a first mold 210 (lower mold, punch), a second mold 220 (die pad), and a third mold 230 (die).
　第１金型２１０は、パンチ凸部２１２を有している。パンチ凸部２１２は、図示しない土台に固定されている。パンチ凸部２１２は、長手方向Ｘ２に沿って延びる凸状部分であり、土台から第２金型２２０側に立ち上がっている。 The first mold 210 has a punch convex portion 212 . The punch projection 212 is fixed to a base (not shown). The punch convex portion 212 is a convex portion extending along the longitudinal direction X2, and rises from the base toward the second mold 220 side.
　パンチ凸部２１２は、ベース予定部成形部２１５を有している。 The punch convex portion 212 has a forming portion 215 for a planned base portion.
　ベース予定部成形部２１５は、中間成形品４０からワーク５０のベース予定部５１を成形するために設けられている。ベース予定部成形部２１５は、ベース予定部５１の裏面の形状に沿う形状に形成されている。 The planned base part forming part 215 is provided for forming the planned base part 51 of the workpiece 50 from the intermediate molded product 40 . The planned base portion molding portion 215 is formed in a shape that follows the shape of the rear surface of the planned base portion 51 .
　パンチ凸部２１２のうち、凸部６５Ａ，６５Ｂと向かい合う箇所において、短手方向Ｙ２における一対の側面には、窪み部２１８Ａ，２１８Ｂが形成されている。短手方向Ｙ２において、窪み部２１８Ａ，２１８Ｂ間の距離は、ベース予定部成形部２１５の幅より小さい。この構成により、中間成形品４０がプレス成形装置２００によってプレス成形される際に、凸部６５Ａ，６５Ｂの先端は、対応する窪み部２１８Ａ，２１８Ｂに入ることで、パンチ凸部２１２と接触せずに済む。 Recessed portions 218A and 218B are formed on a pair of side surfaces in the lateral direction Y2 of the punch convex portion 212 facing the convex portions 65A and 65B. The distance between the recessed portions 218A and 218B is smaller than the width of the pre-base portion molding portion 215 in the lateral direction Y2. With this configuration, when the intermediate molded product 40 is press-molded by the press-molding device 200, the tips of the convex portions 65A and 65B enter the corresponding recessed portions 218A and 218B so as not to contact the punch convex portion 212. Done.
　第２金型２２０は、第１金型２１０に中間成形品４０を押さえるために設けられている。第２金型２２０は、ベース予定部５１をベース予定部成形部２１５に押さえつける押さえ部２２２を有している。 The second mold 220 is provided to hold the intermediate molded product 40 against the first mold 210 . The second mold 220 has a pressing portion 222 that presses the expected base portion 51 against the expected base portion molding portion 215 .
　第３金型２３０は、第１金型２１０および第２金型２２０が中間成形品４０を挟んだ状態で、第１金型２１０側に移動することで、中間成形品４０にバーリング加工を施す。 The third mold 230 burrs the intermediate molded product 40 by moving toward the first mold 210 while the intermediate molded product 40 is sandwiched between the first mold 210 and the second mold 220. .
　第３金型２３０は、短手方向Ｙ２に並ぶ一対の分割体２３１Ａ，２３１Ｂを有している。一対の分割体２３１Ａ，２３１Ｂは、一対の縦壁予定部成形部２３２Ａ，２３２Ｂと、一対のフランジ予定部成形部２３３Ａ，２３３Ｂと、を有している。これに限らず、第３金型２３０は一つの金型であって、一つの金型の中に分割体２３１Ａ，２３１Ｂに相当する部位があってもよい。第２金型２２０は分割体２３１Ａ，２３１Ｂの間に配置される。第３金型２３０が一つの金型であれば、第２金型２２０は第３金型２３０の内部に配置される。いずれにせよ第２金型２２０は第３金型２３０の内部に配置される。 The third mold 230 has a pair of split bodies 231A and 231B aligned in the lateral direction Y2. The pair of divided bodies 231A and 231B has a pair of vertical wall portion forming portions 232A and 232B and a pair of flange portion forming portions 233A and 233B. Alternatively, the third mold 230 may be a single mold, and the single mold may include parts corresponding to the divided bodies 231A and 231B. The second mold 220 is arranged between the split bodies 231A and 231B. If the third mold 230 is one mold, the second mold 220 is arranged inside the third mold 230 . In any case, the second mold 220 is arranged inside the third mold 230 .
　一対の縦壁予定部成形部２３２Ａ，２３２Ｂは、中間成形品４０から一対の縦壁予定部５３Ａ，５３Ｂを成形するために設けられている。一対の縦壁予定部成形部２３２Ａ，２３２Ｂは、一対の分割体２３１Ａ，２３１Ｂの内側面に形成されており、高さ方向Ｚ１に対して傾斜した面を含んでいる。一対のフランジ予定部成形部２３３Ａ，２３３Ｂは、一対のフランジ予定部５４Ａ，５４Ｂを成形するために設けられている。一対の縦壁予定部成形部２３２Ａ，２３２Ｂは、一対の分割体２３１Ａ，２３１Ｂの内側面に形成されており、高さ方向Ｚ１に対して傾斜した面を含んでいる。 A pair of pre-planned vertical wall portions 232A and 232B are provided to form a pair of pre-planned vertical wall portions 53A and 53B from the intermediate molded product 40. The pair of preliminarily-planned- portion forming portions 232A, 232B are formed on the inner side surfaces of the pair of divided bodies 231A, 231B and include surfaces inclined with respect to the height direction Z1. The pair of pre-flange portion forming portions 233A and 233B are provided for forming the pair of pre-flange portions 54A and 54B. The pair of preliminarily-planned- portion forming portions 232A, 232B are formed on the inner side surfaces of the pair of divided bodies 231A, 231B and include surfaces inclined with respect to the height direction Z1.
　プレス成形装置２００では、第１金型２１０のパンチ凸部２１２に中間成形品４０が載せられた後、第２金型２２０が図示しないアクチュエータによって第１金型２１０側に移動される。これにより、中間成形品４０は、第１金型２１０および第２金型２２０に挟まれる。次に、第３金型２３０が図示しないアクチュエータによって第１金型２１０側に所定の下死点まで移動される。これにより第３金型２３０の一対の分割体２３１Ａ，２３１Ｂは、短手方向Ｙ２における第２金型２２０の両側方を通って第１金型２１０側に移動する。このとき、一対の縦壁予定部成形部２３２Ａ，２３２Ｂは、中間成形品４０のうちパンチ凸部２１２から短手方向Ｙ２に突出する部分を第１金型２１０側に押し下げることで、一対の縦壁予定部５３Ａ，５３Ｂを成形する。また、一対のフランジ予定部成形部２３３Ａ，２３３Ｂは、中間成形品４０のうちパンチ凸部２１２から短手方向Ｙ２に突出する部分を第１金型２１０側に押し下げることで、一対のフランジ予定部５４Ａ，５４Ｂを成形する。また、第１金型２１０，第２金型２２０，および第３金型２３０が協働してベース予定部５１を成形する。なお、プレス成形装置２００は、一対のフランジ予定部５４Ａ，５４Ｂと同様の一対のフランジ予定部５６Ａ，５６Ｂも成形する。その結果、中間成形品４０は、ワーク５０となる。 In the press molding apparatus 200, after the intermediate molded product 40 is placed on the punch convex portion 212 of the first mold 210, the second mold 220 is moved toward the first mold 210 by an actuator (not shown). Thereby, the intermediate molded product 40 is sandwiched between the first mold 210 and the second mold 220 . Next, the third mold 230 is moved toward the first mold 210 to a predetermined bottom dead center by an actuator (not shown). As a result, the pair of divided bodies 231A and 231B of the third mold 230 move toward the first mold 210 through both sides of the second mold 220 in the transverse direction Y2. At this time, the pair of vertical wall preliminarily forming portions 232A and 232B push down the portion of the intermediate molded product 40 that protrudes in the lateral direction Y2 from the punch convex portion 212 toward the first mold 210, thereby forming a pair of vertical wall portions. The expected wall portions 53A and 53B are formed. Further, the pair of pre-flange portion forming portions 233A and 233B are formed by pushing down the portion of the intermediate molded product 40 that protrudes in the lateral direction Y2 from the punch convex portion 212 toward the first mold 210. 54A and 54B are molded. Also, the first mold 210 , the second mold 220 , and the third mold 230 cooperate to mold the pre-base portion 51 . The press forming apparatus 200 also forms a pair of pre-flange portions 56A and 56B similar to the pair of pre-flange portions 54A and 54B. As a result, the intermediate molded product 40 becomes the workpiece 50 .
　ワーク５０においては、高さ方向Ｚ１に対する各縦壁予定部５３Ａ，５３Ｂおよび各フランジ予定部５４Ａ，５４Ｂ，５７Ａ，５７Ｂの角度θ２は、ワーク５０の引張強度および板厚等に応じて、９０度以下の範囲で適宜設定されている。なお、図７（Ａ）、図７（Ｂ）、および、後述する図７（Ｃ）に示すワーク５０は、あくまでワークの一例である。一対のフランジ予定部５４Ａ，５４Ｂ間の空間は、高さ方向Ｚ１（後述するプレス方向Ｐ）の両側に開放されている。同様に、一対のフランジ予定部５６Ａ，５６Ｂ間の空間は、プレス方向Ｐの両側に開放されている。また、ベース予定部５１は、一対のフランジ予定部５４Ａ，５４Ｂに隣接するベース予定部縁部５１ａを含んでいる。ベース予定部縁部５１ａは、本実施形態では、長手方向Ｘ１からみて所定の曲率半径を有する湾曲形状に形成されている。 In the work 50, the angle θ2 of the vertical wall portions 53A, 53B and the flange portions 54A, 54B, 57A, 57B with respect to the height direction Z1 is 90 degrees depending on the tensile strength and plate thickness of the work 50. It is appropriately set within the following range. The work 50 shown in FIGS. 7A, 7B, and FIG. 7C, which will be described later, is merely an example of the work. The space between the pair of pre-flange portions 54A and 54B is open on both sides in the height direction Z1 (pressing direction P described later). Similarly, the space between the pair of pre-flange portions 56A and 56B is open on both sides in the pressing direction P. As shown in FIG. Further, the planned base portion 51 includes a planned base portion edge portion 51a adjacent to the pair of planned flange portions 54A and 54B. In the present embodiment, the planned base portion edge portion 51a is formed in a curved shape having a predetermined radius of curvature when viewed from the longitudinal direction X1.
　長手方向Ｘ１から見て、ベース予定部５１は、例えば、図７（Ａ）および図７（Ｂ）に示す単一アーチ形状に形成されている。なお、ベース予定部５１は、図７（Ｃ）の変形例に示すように短手方向Ｙ１の両側にそれぞれアーチ形状を有する形状に形成されていてもよい。各上記アーチ形状は、例えばベース予定部５１の表面側（上側）に凸となる形状に形成されている。図７（Ｃ）に示す形状では、短手方向Ｙ１におけるベース予定部５１の両端にそれぞれアーチ形状が形成されており、且つ、これらのアーチ形状の一端間が直線形状でつながっている。本実施形態では、長手方向Ｘ１から見て、一対の縦壁予定部５３Ａ，５３Ｂ間におけるベース予定部縁部５１ａの長さが、長さＬｑである。 When viewed from the longitudinal direction X1, the planned base portion 51 is formed in, for example, a single arch shape shown in FIGS. 7(A) and 7(B). Note that the pre-base portion 51 may be formed in a shape having an arch shape on both sides in the lateral direction Y1, as shown in the modified example of FIG. 7(C). Each arch shape is formed, for example, in a shape that protrudes toward the surface side (upper side) of the planned base portion 51 . In the shape shown in FIG. 7C, arch shapes are formed at both ends of the planned base portion 51 in the lateral direction Y1, and one ends of these arch shapes are connected in a straight line. In this embodiment, the length of the planned base portion edge portion 51a between the pair of planned vertical wall portions 53A and 53B is the length Lq when viewed from the longitudinal direction X1.
　前述したように、一対の縦壁６３Ａ，６３Ｂ間におけるベース部縁部の長さは、長さＬｐである（図２（Ｃ））。図２（Ｃ）、図７（Ａ）および図７（Ｃ）を一例として、好ましくは、１．０＜Ｌｑ／Ｌｐ＜１．２である。Ｌｑ／Ｌｐが上記の下限未満であると、ワーク５０をプレス成形品６０に成形したときに、ベース予定部５１のベース予定部縁部５１ａに大きな引張荷重が生じ易い。このため、一対の縦壁６３Ａ，６３Ｂの先端間の間隔が大きくなる壁開きが生じてしまい、プレス成形品６０の寸法精度が悪化する。一方、Ｌｑ／Ｌｐが上記の上限を超えていると、ワーク５０をプレス成形品６０に成形する際に、ベース予定部５１が短手方向Ｙ１に大きく伸びるように変形する。その結果、一対の縦壁６３Ａ，６３Ｂの高さ方向Ｚ１の先端間が過度に近づく壁閉じが生じてしまい、プレス成形品６０の寸法精度が悪化し易くなる。一方、Ｌｑ／Ｌｐを上記の範囲に設定することで、ワーク５０をプレス成形品６０に成形する際、線長差（Ｌｑ－Ｌｐ）が吸収されるように（ゼロとなるように）ベース予定部５１が適度な変形を生じる。その結果、上記の壁開き（反り量Ｓ）を抑制でき、壁開きに起因する曲げ外側に生じる引張応力を緩和できる。反り量Ｓは、縦壁６３Ａの先端または縦壁６３Ｂの先端が、本来の位置から短手方向Ｙ１にどれだけ位置ずれしているかを示す値である。さらに、本実施形態では、プレス成形品６０の曲げ外側に生じる引張応力と曲げ内側に生じる圧縮応力について、より圧縮応力が大きくなるようにでき、壁開きをより一層抑制できる。本発明者がコンピュータシミュレーションを行った一例では、プレス成形品６０の引張強度が７８０ＭＰａ、板厚＝２．３ｍｍの条件下において、Ｌｑ／Ｌｐ＝１．０の場合（線長差無し）と比べて、Ｌｑ／Ｌｐ＝１．１の場合には、反り量Ｓ（壁開き量）が、最大で約３０％低減できた。 As described above, the length of the base portion edge between the pair of vertical walls 63A and 63B is the length Lp (Fig. 2(C)). Taking FIGS. 2(C), 7(A) and 7(C) as an example, preferably 1.0<Lq/Lp<1.2. If Lq/Lp is less than the above lower limit, when the workpiece 50 is formed into the press-formed product 60, a large tensile load is likely to occur on the edge portion 51a of the planned base portion 51. As a result, a gap between the tips of the pair of vertical walls 63A and 63B is increased, and the dimensional accuracy of the press-formed product 60 is deteriorated. On the other hand, if Lq/Lp exceeds the above upper limit, when the workpiece 50 is formed into the press-formed product 60, the pre-base portion 51 is deformed so as to extend greatly in the lateral direction Y1. As a result, wall closure occurs in which the ends of the pair of vertical walls 63A and 63B in the height direction Z1 are excessively close to each other, and the dimensional accuracy of the press-formed product 60 tends to deteriorate. On the other hand, by setting Lq/Lp in the above range, when the workpiece 50 is formed into the press-formed product 60, the line length difference (Lq-Lp) is absorbed (zero). The portion 51 is moderately deformed. As a result, the wall opening (warp amount S) can be suppressed, and the tensile stress generated on the outside of the bending due to the wall opening can be alleviated. The warp amount S is a value that indicates how much the tip of the vertical wall 63A or the tip of the vertical wall 63B is displaced from its original position in the lateral direction Y1. Furthermore, in the present embodiment, the tensile stress generated on the outside of the bend of the press-formed product 60 and the compressive stress generated on the inside of the bend can be made larger, and wall opening can be further suppressed. In one example of a computer simulation conducted by the present inventor, under the conditions that the tensile strength of the press-formed product 60 is 780 MPa and the plate thickness is 2.3 mm, compared with the case of Lq/Lp = 1.0 (no line length difference) In the case of Lq/Lp=1.1, the warp amount S (wall opening amount) could be reduced by about 30% at maximum.
＜第２立上工程（ステップＳ６）＞
　第２立上工程では、第２立上工程用のプレス成形装置３００を用いてワーク５０にプレス成形（第２立上成形）を行う。図８は、第２立上工程用のプレス成形装置３００およびワーク５０の主要部の模式的な斜視図である。図９は、プレス成形装置３００の成形下死点ＰＬでの主要部の側面図である。図１０（Ａ）～図１０（Ｃ）は、それぞれ、プレス成形装置３００の成形下死点での主要部の変形例の長手方向Ｘ２と高さ方向Ｚ２に沿った縦断面図である。図１１は、プレス成形装置３００の主要部をプレス成形装置３００の横断面で示した図であって、成形上死点ＰＵにある状態を示している。図１２は、プレス成形装置３００の主要部をプレス成形装置３００の横断面で示した図であって、成形下死点ＰＬにある状態を示している。図８～図１２に示す通り、第２立上工程では、ワーク５０からプレス成形品６０を成形する。 <Second Rising Step (Step S6)>
In the second start-up process, the press forming device 300 for the second start-up process is used to perform press forming (second start-up forming) on the workpiece 50 . FIG. 8 is a schematic perspective view of the press forming apparatus 300 for the second start-up process and the principal parts of the workpiece 50. FIG. FIG. 9 is a side view of the principal parts of the press forming apparatus 300 at the forming bottom dead center PL. 10(A) to 10(C) are vertical cross-sectional views along the longitudinal direction X2 and the height direction Z2, respectively, of modifications of the main portion of the press forming apparatus 300 at the forming bottom dead center. FIG. 11 is a cross-sectional view of the main part of the press forming apparatus 300, showing a state at the forming top dead center PU. FIG. 12 is a cross-sectional view of the main part of the press forming apparatus 300, showing a state at the forming bottom dead center PL. As shown in FIGS. 8 to 12, in the second start-up process, a press-formed product 60 is formed from the workpiece 50. As shown in FIGS.
　プレス成形装置３００において、パンチ３１０とダイパッド３２０およびダイ３３０とが最も接近したときの各部材３１０，３２０，３３０の位置が成形下死点ＰＬである。また、パンチ３１０とダイパッド３２０およびダイ３３０とが最も離隔したときの各部材３１０，３２０，３３０の位置が成形上死点ＰＵである。本実施形態では、プレス方向Ｐのうちダイパッド３２０からパンチ３１０に向かう方向が第１方向Ｐ１であり、第１方向Ｐ１と反対方向が第２方向Ｐ２である。本実施形態では、第１方向Ｐ１は下方向であり、第２方向Ｐ２は上方向である。 In the press forming apparatus 300, the positions of the members 310, 320, 330 when the punch 310 and the die pad 320 and the die 330 are closest to each other are the forming bottom dead points PL. Further, the position of each member 310, 320, 330 when the punch 310, the die pad 320 and the die 330 are most separated is the forming top dead point PU. In this embodiment, the direction from the die pad 320 to the punch 310 in the pressing direction P is the first direction P1, and the direction opposite to the first direction P1 is the second direction P2. In this embodiment, the first direction P1 is downward and the second direction P2 is upward.
　プレス成形装置３００の金型は、プレス成形装置２００と同様に、長手方向Ｘ２に細長く、短手方向Ｙ２に短い形状に形成され、高さ方向Ｚ２に複数の金型が並んだ構成を有している。長手方向Ｘ２、短手方向Ｙ２、および高さ方向Ｚ２は、プレス成形装置３００にワーク５０が載せられたときのワーク５０の長手方向Ｘ１、短手方向Ｙ１、および高さ方向Ｚ１と一致している。本実施形態では、高さ方向Ｚ２が、プレス成形装置３００におけるプレス方向Ｐと一致している。 As with the press molding apparatus 200, the mold of the press molding apparatus 300 is elongated in the longitudinal direction X2 and short in the lateral direction Y2, and has a configuration in which a plurality of molds are arranged in the height direction Z2. ing. The longitudinal direction X2, the lateral direction Y2, and the height direction Z2 coincide with the longitudinal direction X1, the lateral direction Y1, and the height direction Z1 of the work 50 when the work 50 is placed on the press forming device 300. there is In this embodiment, the height direction Z2 coincides with the press direction P in the press molding device 300. As shown in FIG.
　なお、プレス成形装置３００の金型は、長手方向Ｘ２に対称な形状に形成されていてもよい。そして、プレス成形装置３００の金型がワーク５０をプレス成形品６０に成形する動作も、長手方向Ｘ２に対称である。よって、プレス成形装置３００におけるプレス動作については、長手方向Ｘ２の一方側での構成を主に説明し、長手方向Ｘ２の他方側の構成の詳細な説明を省略する。 The mold of the press molding device 300 may be formed in a shape symmetrical with respect to the longitudinal direction X2. The operation of the mold of the press-molding device 300 to mold the work 50 into the press-molded product 60 is also symmetrical with respect to the longitudinal direction X2. Therefore, regarding the press operation in the press forming apparatus 300, the configuration on one side in the longitudinal direction X2 will be mainly described, and the detailed description of the configuration on the other side in the longitudinal direction X2 will be omitted.
　プレス成形装置３００は、パンチ３１０と、ダイパッド３２０と、ダイ３３０と、を有している。本実施形態では、パンチ３１０に対してダイパッド３２０およびダイ３３０がプレス方向Ｐに移動する。 The press molding device 300 has a punch 310 , a die pad 320 and a die 330 . In this embodiment, the die pad 320 and the die 330 move in the pressing direction P with respect to the punch 310 .
　パンチ３１０は、パンチ本体３１２を有している。パンチ本体３１２は、図示しない土台に固定されている。パンチ本体３１２は、長手方向Ｘ２に沿って延びる凸状部分である。 The punch 310 has a punch body 312 . The punch body 312 is fixed to a base (not shown). The punch body 312 is a convex portion extending along the longitudinal direction X2.
　パンチ本体３１２は、第１フランジ成形部３１３Ａ，３１３Ｂと、ストッパ３１４と、ベース成形部３１５と、縦壁成形部３１６Ａ，３１６Ｂと、を有している。 The punch body 312 has first flange forming portions 313A and 313B, a stopper 314, a base forming portion 315, and vertical wall forming portions 316A and 316B.
　第１フランジ成形部３１３Ａ，３１３Ｂは、パンチ３１０に載せられたワーク５０におけるフランジ予定部５４Ａ，５４Ｂと短手方向Ｙ２に向かい合う部分であり、且つ、フランジ予定部５４Ａ，５４Ｂの対向面５４ａＡ，５４ａＢの一部を受けることで、フランジ予定部５４Ａ，５４Ｂをフランジ６４Ａ，６４Ｂに成形する。短手方向Ｙ２におけるパンチ本体３１２の一対の端面に、第１フランジ成形部３１３Ａ，３１３Ｂが設けられている。本実施形態では、第１フランジ成形部３１３Ａ，３１３Ｂは、第２立上工程時、一対のフランジ予定部５４Ａ，５４Ｂの対向面５４ａＡ，５４ａＢ（内側面）を受ける。第１フランジ成形部３１３Ａ，３１３Ｂは、本実施形態では、プレス方向Ｐに沿った平面であり、短手方向Ｙ２と直交している。第１フランジ成形部３１３Ａ，３１３Ｂは、長手方向Ｘ２におけるパンチ本体３１２の一端側（図８の右側）に配置されている。本実施形態では、第１フランジ成形部３１３Ａ，３１３Ｂは、各フランジ予定部５４Ａ，５４Ｂのうちフランジ予定部５４Ａ，５４Ｂの円周方向の大部分（３６０度の２／３程度）の角度範囲とプレス成形時に接触するように構成されている。また、第１フランジ成形部３１３Ａ，３１３Ｂがプレス成形装置３００の下金型であるパンチ３１０に設けられていることにより、プレス方向Ｐにおいて、第１フランジ成形部３１３Ａ，３１３Ｂは、一対のフランジ予定部５４Ａ，５４Ｂの一端（下端）間に配置されてこれらフランジ予定部５４Ａ，５４Ｂを受ける。 The first flange forming portions 313A and 313B are portions facing the pre-flange portions 54A and 54B of the workpiece 50 placed on the punch 310 in the lateral direction Y2, and the facing surfaces 54aA and 54aB of the pre-flange portions 54A and 54B. By receiving a part of the flange preliminaries 54A and 54B, the flanges 64A and 64B are formed. First flange forming portions 313A and 313B are provided on a pair of end faces of the punch body 312 in the lateral direction Y2. In the present embodiment, the first flange forming portions 313A and 313B receive the facing surfaces 54aA and 54aB (inner surfaces) of the pair of pre-flange portions 54A and 54B during the second rising process. In the present embodiment, the first flange forming portions 313A and 313B are planes along the pressing direction P and perpendicular to the lateral direction Y2. The first flange forming portions 313A and 313B are arranged on one end side (right side in FIG. 8) of the punch body 312 in the longitudinal direction X2. In the present embodiment, the first flange forming portions 313A and 313B have an angular range of most (approximately 2/3 of 360 degrees) in the circumferential direction of the pre-flange portions 54A and 54B of the pre-flange portions 54A and 54B. It is configured to come into contact during press molding. In addition, since the first flange forming portions 313A and 313B are provided in the punch 310 which is the lower die of the press forming device 300, the first flange forming portions 313A and 313B are formed as a pair of flanges in the pressing direction P. It is arranged between one ends (lower ends) of the portions 54A and 54B to receive the pre-flanged portions 54A and 54B.
　パンチ本体３１２のうち、第１フランジ成形部３１３Ａ，３１３Ｂに隣接する箇所の短手方向Ｙ２における一対の端面には、窪み部３１８Ａ，３１８Ｂが形成されている。短手方向Ｙ２において、窪み部３１８Ａ，３１８Ｂ間の距離（幅）は、ベース成形部３１５の幅より小さく、且つ、第１フランジ成形部３１３Ａ，３１３Ｂ間の距離より小さい。パンチ本体３１２のうち窪み部３１８Ａ，３１８Ｂが形成されている箇所が、ストッパ３１４となっている。 In the punch body 312, depressions 318A and 318B are formed in a pair of end faces in the lateral direction Y2 at locations adjacent to the first flange forming parts 313A and 313B. In the lateral direction Y2, the distance (width) between the recessed portions 318A and 318B is smaller than the width of the base forming portion 315 and smaller than the distance between the first flange forming portions 313A and 313B. A portion of the punch body 312 where the depressions 318A and 318B are formed serves as a stopper 314. As shown in FIG.
　プレス成形装置３００におけるプレス成形時、ストッパ３１４は、ワーク５０の凸部６５Ａ，６５Ｂ間にある。ストッパ３１４は、凸部６５Ａ，６５Ｂの先端を受けることにより、第２立上工程時における凸部６５Ａ，６５Ｂの位置決め部材として機能する。より具体的には、短手方向Ｙ２におけるストッパ３１４の一対の端面が、凸部６５Ａ，６５Ｂを受ける。ストッパ３１４の上記一対の端面は、本実施形態では、プレス方向Ｐに沿った面であり、短手方向Ｙ２と直交している。ストッパ３１４の上記一対の端面の下部は、凸部６５Ａ，６５Ｂの形状に沿った円弧形状に形成されている。ストッパ３１４の上記一対の端面の上端部は、ダイパッド３２０側に開放されている。 During press molding in the press molding device 300, the stopper 314 is between the projecting portions 65A and 65B of the workpiece 50. The stopper 314 functions as a positioning member for the projections 65A and 65B during the second rising process by receiving the tips of the projections 65A and 65B. More specifically, a pair of end surfaces of the stopper 314 in the lateral direction Y2 receive the protrusions 65A and 65B. In this embodiment, the pair of end faces of the stopper 314 are faces along the pressing direction P and perpendicular to the lateral direction Y2. Lower portions of the pair of end surfaces of the stopper 314 are formed in an arc shape along the shape of the projections 65A and 65B. Upper ends of the pair of end surfaces of the stopper 314 are open to the die pad 320 side.
　ストッパ３１４の先端面３１４ａ（上端部）は、パンチ本体３１２のうちベース成形部３１５が形成されている上端面から下方（プレス方向Ｐの一方）側に配置されている。すなわち、プレス方向Ｐにおいて、ストッパ３１４の先端面３１４ａは、ベース成形部３１５から奥まった箇所に配置されている。ベース成形部３１５からストッパ３１４の上端面３１４ａまでの距離であるオフセット量ＯＦは、例えば、０ｍｍ以上ＯＦｍａｘ以下であることが好ましい。オフセット量ＯＦ＝ＯＦｍａｘであるとき、上端面３１４ａの上端の高さ位置は、第２立上工程完了時における、パンチ３１０に載せられているプレス成形品６０の凸部６５Ａ，６５Ｂの上端の高さ位置に一致する。オフセット量ＯＦが上記の上限を超えると、ダイパッド３２０がワーク５０を押さえている状態でダイ３３０が第１方向Ｐ１に移動し第３フランジ成形部３３３Ａ，３３３Ｂがフランジ予定部５４Ａ，５４Ｂを後述する第２フランジ成形部３２４Ａ，３２４Ｂ側に変位させたときに、凸部６５Ａ，６５Ｂと第２フランジ成形部３２４Ａ，３２４Ｂとが干渉するおそれがある。凸部６５Ａ，６５Ｂと第２フランジ成形部３２４Ａ，３２４Ｂとが干渉すると、ワーク５０の縦壁予定部５３Ａ，５３Ｂ同士を十分に閉じた状態にできなくなる。この状態で第３フランジ成形部３３３Ａ，３３３Ｂでワーク５０を無理に加圧すると、凸部６５Ａ，６５Ｂの形状が歪んで変形してしまう。その結果、所望の成形品形状にプレス成形できなくなってしまう。短手方向Ｙ２から見て、ストッパ３１４の先端面３１４ａの形状は、本実施形態では、円弧形状である。先端面３１４ａの形状は、曲率半径が一定の円弧形状であってもよいし、複数の曲率半径を有する円弧形状であってもよいし、後述する幅広部３２３の先端面３２３ａの形状に合致する形状であってもよい。 A tip surface 314a (upper end) of the stopper 314 is arranged downward (one side in the pressing direction P) of the upper end surface of the punch body 312 where the base molding portion 315 is formed. That is, in the pressing direction P, the tip surface 314 a of the stopper 314 is arranged at a position recessed from the base forming portion 315 . An offset amount OF, which is the distance from the base forming portion 315 to the upper end surface 314a of the stopper 314, is preferably 0 mm or more and OFmax or less, for example. When the offset amount OF=OFmax, the height position of the upper end of the upper end surface 314a is the height of the upper ends of the convex portions 65A and 65B of the press-formed product 60 placed on the punch 310 when the second rising process is completed. match the position. When the offset amount OF exceeds the above upper limit, the die 330 moves in the first direction P1 while the die pad 320 is pressing the workpiece 50, and the third flange forming portions 333A and 333B move to the planned flange portions 54A and 54B, which will be described later. When displaced toward the second flange forming portions 324A, 324B, there is a risk that the convex portions 65A, 65B and the second flange forming portions 324A, 324B may interfere with each other. If the projecting portions 65A, 65B and the second flange forming portions 324A, 324B interfere with each other, the pre-planned vertical wall portions 53A, 53B of the workpiece 50 cannot be sufficiently closed. If the workpiece 50 is forcibly pressed by the third flange forming portions 333A and 333B in this state, the convex portions 65A and 65B are distorted and deformed. As a result, it becomes impossible to press-mold into a desired molded product shape. When viewed from the lateral direction Y2, the tip surface 314a of the stopper 314 has an arc shape in this embodiment. The shape of the tip surface 314a may be an arc shape with a constant radius of curvature, or an arc shape with a plurality of radii of curvature, and may match the shape of the tip surface 323a of the wide portion 323 described later. It may be in shape.
　ベース成形部３１５は、ワーク５０からプレス成形品６０のベース６１を成形するために設けられている。ベース成形部３１５は、ベース６１の裏面の形状に沿う形状に形成されている。ベース成形部３１５は、パンチ本体３１２の上端面に設けられており、本実施形態では、平坦で且つ短手方向Ｙ２の両端部が長手方向Ｘ２から見て湾曲した形状に形成されている。短手方向Ｙ２におけるベース成形部３１５の両端から下方に、縦壁成形部３１６Ａ，３１６Ｂが延びている。 The base forming part 315 is provided for forming the base 61 of the press-formed product 60 from the work 50. The base molding portion 315 is formed in a shape that follows the shape of the back surface of the base 61 . The base molding portion 315 is provided on the upper end surface of the punch body 312, and in this embodiment, is formed in a flat shape with both ends in the lateral direction Y2 curved when viewed from the longitudinal direction X2. Vertical wall molding portions 316A and 316B extend downward from both ends of the base molding portion 315 in the lateral direction Y2.
　縦壁成形部３１６Ａ，３１６Ｂは、ワーク５０からプレス成形品６０の縦壁６３Ａ，６３Ｂを成形するために設けられている。一対の縦壁成形部３１６Ａ，３１６Ｂは、短手方向Ｙ２におけるパンチ本体３１２の一対の端面に形成されており、本実施形態では、プレス方向Ｐと平行な面を含んでいる。 The vertical wall forming portions 316A, 316B are provided to form the vertical walls 63A, 63B of the press-formed product 60 from the work 50. A pair of vertical wall forming portions 316A and 316B are formed on a pair of end faces of the punch body 312 in the lateral direction Y2, and include surfaces parallel to the pressing direction P in this embodiment.
　ダイパッド３２０は、ベース６１の予定部としてのベース予定部５１をパンチ３１０と協働して挟む。ダイパッド３２０は、パンチ３１０とプレス方向Ｐに対向して配置される。また、ダイパッド３２０はダイ３３０の内側に配置される。本実施形態では、成形下死点ＰＬにおいて、ダイパッド３２０は、ダイ３３０の後述する分割体３３１Ａ，３３１Ｂで区画された空間に配置される。ダイパッド３２０は、長手方向Ｘ２に細長く延びる部材である。ダイパッド３２０は、図示しないアクチュエータによってプレス方向Ｐに移動する。ダイパッド３２０は、長手方向Ｘ２に細長く延びる部分であり、ダイ３３０の分割体３３１Ａ，３３１Ｂを通過させることが可能な形状を有している。 The die pad 320 cooperates with the punch 310 to sandwich the planned base portion 51 as the planned portion of the base 61 . The die pad 320 is arranged to face the punch 310 in the pressing direction P. As shown in FIG. Also, the die pad 320 is located inside the die 330 . In the present embodiment, the die pad 320 is arranged in a space defined by divided bodies 331A and 331B of the die 330 at the molding bottom dead center PL. The die pad 320 is a member elongated in the longitudinal direction X2. The die pad 320 is moved in the press direction P by an actuator (not shown). The die pad 320 is a portion elongated in the longitudinal direction X2 and has a shape that allows the divided bodies 331A and 331B of the die 330 to pass therethrough.
　ダイパッド３２０は、長手方向Ｘ２に延びる軸状部３２１と、軸状部３２１に形成されベース予定部５１を押さえる押さえ部３２２と、軸状部３２１に形成され押さえ部３２２に対して長手方向Ｘ２の一方側に配置され軸状部３２１の幅よりも広い幅の幅広部３２３と、有している。 The die pad 320 includes a shaft-shaped portion 321 extending in the longitudinal direction X2, a holding portion 322 formed on the shaft-shaped portion 321 and holding the pre-base portion 51, and a pressing portion 322 formed on the shaft-shaped portion 321 and extending in the longitudinal direction X2 with respect to the holding portion 322. A wide portion 323 arranged on one side and having a width wider than the width of the shaft-like portion 321 is provided.
　押さえ部３２２は、ダイパッド３２０のうち、ベース成形部３１５とプレス方向Ｐに対向する箇所に配置されており、本実施形態では、押さえ部３２２の下端面に形成されており、長手方向Ｘ２に細長い面である。 The pressing portion 322 is arranged at a portion of the die pad 320 facing the base molding portion 315 in the pressing direction P. In this embodiment, the pressing portion 322 is formed on the lower end surface of the pressing portion 322 and is elongated in the longitudinal direction X2. It is the surface.
　幅広部３２３は、一対のフランジ予定部５４Ａ，５４Ｂをこれら一対のフランジ予定部５４Ａ，５４Ｂの対向面５４ａＡ，５４ａＢ間で受けるための中子として設けられており、一対のフランジ予定部５４Ａ，５４Ｂ間のうちプレス方向Ｐにおけるダイパッド３２０側（上側）に配置されている。なお、幅広部３２３は、本実施形態では、ダイパッド３２０の一部分として設けられているが、この通りで無くてもよい。幅広部３２３は、例えば、ダイパッド３２０とは別部材によって構成されダイパッド３２０とは独立してプレス方向Ｐに移動可能とされてもよい。その場合であっても幅広部３２０はダイの内側にあるパッドであるため、ダイパッド３２０の一部とみなす。 The wide portion 323 is provided as a core for receiving the pair of pre-flange portions 54A and 54B between the facing surfaces 54aA and 54aB of the pair of pre-flange portions 54A and 54B. It is arranged on the die pad 320 side (upper side) in the pressing direction P in the middle. Although the wide portion 323 is provided as a part of the die pad 320 in this embodiment, it may not be so. For example, the wide portion 323 may be configured by a member separate from the die pad 320 and movable in the pressing direction P independently of the die pad 320 . Even in that case, the wide portion 320 is considered part of the die pad 320 because it is a pad inside the die.
　幅広部３２３は、軸状部３２１のうち、パンチ３１０のストッパ３１４とプレス方向Ｐに対向しており、軸状部３２１から下方に突出している。幅広部３２３における、短手方向Ｙ２の一対の端面は、第２フランジ成形部３２４Ａ，３２４Ｂを含んでいる。プレス成形時、第２フランジ成形部３２４Ａ，３２４Ｂは、一対のフランジ予定部５４Ａ，５４Ｂの対向面５４ａＡ，５４ａＢ（内側面）を受ける。第２フランジ成形部３２４Ａ，３２４Ｂは、本実施形態では、プレス方向Ｐと平行な平面であり、短手方向Ｙ２と直交している。本実施形態では、第２フランジ成形部３２４Ａ，３２４Ｂは、各フランジ予定部５４Ａ，５４Ｂのうちフランジ予定部５４Ａ，５４Ｂの円周方向の一部分（３６０度の１／３程度）の角度範囲とプレス成形時に接触するように構成されている。第２フランジ成形部３２４Ａ，３２４Ｂは、フランジ６４Ａ，６４Ｂの対向面６４ａＡ，６４ａＢの形状に沿った形状に形成されている。 The wide portion 323 of the shaft portion 321 faces the stopper 314 of the punch 310 in the pressing direction P and protrudes downward from the shaft portion 321 . A pair of end faces in the lateral direction Y2 of the wide portion 323 include second flange forming portions 324A and 324B. During press forming, the second flange forming portions 324A and 324B receive the facing surfaces 54aA and 54aB (inner side surfaces) of the pair of pre-flange portions 54A and 54B. In this embodiment, the second flange forming portions 324A and 324B are planes parallel to the pressing direction P and perpendicular to the lateral direction Y2. In the present embodiment, the second flange forming portions 324A and 324B are formed by an angle range of a portion (about 1/3 of 360 degrees) in the circumferential direction of the pre-flange portions 54A and 54B and a press angle. It is configured to contact during molding. The second flange forming portions 324A, 324B are formed in a shape along the shape of the facing surfaces 64aA, 64aB of the flanges 64A, 64B.
　本実施形態では、短手方向Ｙ２における幅広部３２３（第２フランジ成形部３２４Ａ，３２４Ｂ）の幅Ｗ３２は、一対のフランジ６４Ａ，６４Ｂの対向面６４ａＡ，６４ａＢ間の距離と一致しており、且つ、第１フランジ成形部３１３Ａ，３１３Ｂの幅と一致している。本実施形態では、この幅Ｗ３２は、軸状部３２１の幅Ｗ３１よりも大きい。これにより、ダイパッド３２０とダイ３３０との互いの干渉が抑制されている。 In this embodiment, the width W32 of the wide portion 323 (the second flange forming portions 324A and 324B) in the lateral direction Y2 matches the distance between the facing surfaces 64aA and 64aB of the pair of flanges 64A and 64B, and , and the width of the first flange forming portions 313A and 313B. In this embodiment, the width W32 is larger than the width W31 of the shaft-like portion 321. As shown in FIG. This suppresses mutual interference between the die pad 320 and the die 330 .
　成形下死点ＰＬにおいて、幅広部３２３は、空間Ｓ３に配置されている。空間Ｓ３は、短手方向Ｙ２から見てパンチ３１０におけるストッパ３１４の先端面３１４ａとパンチ本体３１２の先端面３１２ａ（ベース成形部３１５）との間の空間である。これにより、幅広部３２３は、プレス方向Ｐにおける一対のフランジ予定部５４Ａ，５４Ｂの他端間（上端間）に配置される。第１および第２フランジ成形部３１３Ａ，３１３Ｂ，３２４Ａ，３２４Ｂは、プレス成形装置３００が一対のフランジ予定部５４Ａ，５４Ｂを互いに近づけて一対のフランジ６４Ａ，６４Ｂとする際に、一対のフランジ予定部５４Ａ，５４Ｂの互いの対向面５４ａＡ，５４ａＢを受けるように配置される。 At the molding bottom dead center PL, the wide portion 323 is arranged in the space S3. The space S3 is a space between the tip surface 314a of the stopper 314 in the punch 310 and the tip surface 312a (the base molding portion 315) of the punch body 312 when viewed from the lateral direction Y2. Thereby, the wide portion 323 is arranged between the other ends (between the upper ends) of the pair of pre-flange portions 54A and 54B in the pressing direction P. As shown in FIG. The first and second flange forming portions 313A, 313B, 324A, and 324B form a pair of pre-flange portions 54A and 54B when the press forming device 300 brings the pair of pre-flange portions 54A and 54B closer to each other to form a pair of flanges 64A and 64B. It is arranged to receive the opposing surfaces 54aA and 54aB of 54A and 54B.
　より詳細には、成形下死点ＰＬにおいて、第２フランジ成形部３２４Ａ，３２４Ｂは、プレス方向Ｐにおけるベース予定部５１寄りの箇所（上側）に配置されており、第１フランジ成形部３１３Ａ，３１３Ｂは、ベース予定部５１とは反対側（下側）に配置されている。成形下死点ＰＬにおいて、第２フランジ成形部３２４Ａ，３２４Ｂが形成されている幅広部３２３は、ストッパ３１４と接触してもよいし、離隔していてもよい。長手方向Ｘ２において、第２フランジ成形部３２４Ａ，３２４Ｂの長さは、ストッパ３１４の長さ以下であればよい。第１および第２フランジ成形部３１３Ａ，３２４Ａは、同一平面上に並んでいることが、フランジ６４Ａをより平坦にできる点で好ましい。同様に、第１および第２フランジ成形部３１３Ｂ，３２４Ｂは、同一平面上に並んでいることが、フランジ６４Ｂをより平坦にできる点で好ましい。第１および第２フランジ成形部３１３Ａ，３１３Ｂ，３２４Ａ，３２４Ｂと、フランジ予定部５４Ａ，５４Ｂの対向面５４ａＡ，５４ａＢとが向かい合う面積が大きいほど、フランジ予定部５４Ａ，５４Ｂがプレス成形装置３００でプレス成形されてフランジ６４Ａ，６４Ｂが成形されたときの、フランジ６４Ａ，６４Ｂの寸法精度をより高くできる。 More specifically, at the forming bottom dead center PL, the second flange forming portions 324A and 324B are arranged near the base portion 51 (upper side) in the pressing direction P, and the first flange forming portions 313A and 313B are arranged. is disposed on the opposite side (lower side) of the planned base portion 51 . At the forming bottom dead center PL, the wide portion 323 formed with the second flange forming portions 324A and 324B may be in contact with or separated from the stopper 314 . The length of the second flange forming portions 324A and 324B in the longitudinal direction X2 may be the length of the stopper 314 or less. It is preferable that the first and second flange forming portions 313A and 324A are arranged on the same plane in order to make the flange 64A flatter. Similarly, it is preferable that the first and second flange forming portions 313B and 324B are arranged on the same plane in order to make the flange 64B flatter. The larger the facing area between the first and second flange forming portions 313A, 313B, 324A, 324B and the facing surfaces 54aA, 54aB of the pre-flange portions 54A, 54B, the more the pre-flange portions 54A, 54B are pressed by the press forming device 300. The dimensional accuracy of the flanges 64A, 64B when molded to form the flanges 64A, 64B can be increased.
　図９に示すように、短手方向Ｙ２から見て、すなわち、長手方向Ｘ２と高さ方向Ｚ２に沿った縦断面において、幅広部３２３の先端面３２３ａは、弧形状に形成されている。本実施形態では、幅広部３２３は、円弧形状に形成されている。成形下死点ＰＬにおいて、短手方向Ｙ２から見て、幅広部３２３の先端面３２３ａの曲率中心は、ストッパ３１４の先端面３１４ａの曲率中心に略一致している。なお、短手方向Ｙ２から見て、先端面３２３ａは、楕円弧形状に形成されていてもよい。 As shown in FIG. 9, when viewed from the lateral direction Y2, that is, in a vertical cross section along the longitudinal direction X2 and the height direction Z2, the distal end surface 323a of the wide portion 323 is formed in an arc shape. In this embodiment, the wide portion 323 is formed in an arc shape. At the molding bottom dead center PL, the center of curvature of the distal end surface 323a of the wide portion 323 substantially coincides with the center of curvature of the distal end surface 314a of the stopper 314 when viewed from the lateral direction Y2. Note that the distal end surface 323a may be formed in an elliptical arc shape when viewed from the lateral direction Y2.
　なお、上述の説明では、短手方向Ｙ２から見た幅広部３２３の形状が弧形状である形態を例に説明した。しかしながら、この通りでなくてもよい。例えば、図１０（Ａ）～図１０（Ｃ）に示す、幅広部３２３の変形例１～３のように、幅広部３２３の先端面３２３ａの縦断面形状が、くさび形状等に形成されていてもよい。図１０（Ａ）の変形例１では、幅広部３２３の先端面３２３ａの縦断面形状が、長手方向Ｘ２に沿ってベース成形部３１５から遠ざかるに従いプレス方向Ｐのうちの上側（第２方向Ｐ２側）に進む傾斜形状に形成されている。また、図１０（Ｂ）の変形例２では、幅広部３２３の先端面３２３ａの縦断面形状が、長手方向Ｘ２と平行である。図１０（Ｃ）の変形例３では、幅広部３２３の先端面３２３ａの縦断面形状が、長手方向Ｘ２に沿ってベース成形部３１５から遠ざかるに従いプレス方向Ｐのうちの下側（第１方向Ｐ１側）に進む傾斜形状に形成されている。 In addition, in the above description, the form in which the shape of the wide portion 323 as viewed from the lateral direction Y2 is arc-shaped has been described as an example. However, this need not be the case. For example, as in modified examples 1 to 3 of the wide portion 323 shown in FIGS. 10A to 10C, the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 is formed in a wedge shape or the like. good too. In Modified Example 1 of FIG. 10(A), the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 changes upward in the pressing direction P (second direction P2 side) as the distance from the base forming portion 315 increases along the longitudinal direction X2. ) is formed in an inclined shape. Further, in Modified Example 2 of FIG. 10B, the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 is parallel to the longitudinal direction X2. In Modified Example 3 of FIG. 10(C), the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 changes downward in the pressing direction P (first direction P1) as the distance from the base forming portion 315 increases along the longitudinal direction X2 side).
　上述したように、幅広部３２３の先端面３２３ａの縦断面形状が弧形状またはくさび形状等に形成されていることで、幅広部３２３を一対のフランジ６４Ａ，６４Ｂ間の隙間に対してスムーズに出し入れできる。 As described above, since the longitudinal cross-sectional shape of the distal end surface 323a of the wide portion 323 is formed in an arc shape or a wedge shape, etc., the wide portion 323 can be smoothly moved in and out of the gap between the pair of flanges 64A and 64B. can.
　図１２に示すように、成形下死点ＰＬにおいて、ダイパッド３２０とパンチ３１０のプレス方向Ｐに沿った面が、第１および第２フランジ成形部３１３Ａ，３２４Ａと、第１および第２フランジ成形部３１３Ｂ，３２４Ｂである。成形下死点ＰＬにおいて、第１および第２フランジ成形部３１３Ａ，３２４Ａと、第１および第２フランジ成形部３１３Ｂ，３２４Ｂは、何れも、ダイ３３０と短手方向Ｙ２に向かい合っている。そして、成形下死点ＰＬにおいて、第１および第２フランジ成形部３１３Ａ，３２４Ａに穴４００Ａがあり、第１および第２フランジ成形部３１３Ｂ，３２４Ｂに穴４００Ｂがある。これらの穴４００Ａ，４００Ｂの縁部４００ａＡ，４００ａＢは、ダイパッド３２０とパンチ３１０とによって構成されている。 As shown in FIG. 12, at the forming bottom dead center PL, the surfaces of the die pad 320 and the punch 310 along the pressing direction P are formed into first and second flange forming portions 313A and 324A and first and second flange forming portions. 313B and 324B. At the forming bottom dead center PL, the first and second flange forming portions 313A and 324A and the first and second flange forming portions 313B and 324B both face the die 330 in the transverse direction Y2. At the forming bottom dead center PL, holes 400A are formed in the first and second flange forming portions 313A and 324A, and holes 400B are formed in the first and second flange forming portions 313B and 324B. Edges 400aA and 400aB of these holes 400A and 400B are formed by die pad 320 and punch 310. As shown in FIG.
　穴４００Ａ，４００Ｂは、窪み部３１８Ａ，３１８Ｂが配置されている箇所にある。穴４００Ａ，４００Ｂの縁部４００ａＡ，４００ａＢは、本実施形態では、ダイパッド３２０とパンチ３１０との隙間４０１以外の箇所に存在している。すなわち、ダイパッド３２０とパンチ３１０との隙間４０１が狭いほど、穴４００Ａ，４００Ｂの周方向における縁部４００ａＡ，４００ａＢの存在範囲が広くなる。本実施形態では、各縁部４００ａＡ，４００ａＢは、穴４００Ａ，４００Ｂの円周方向のほぼ全域に存在している。縁部４００ａＡは、第１および第２フランジ成形部３１３Ａ，３２４Ａに連続しており、縁部４００ａＢは、第１および第２フランジ成形部３１３Ｂ，３２４Ｂに連続している。 The holes 400A, 400B are located where the depressions 318A, 318B are arranged. Edges 400aA and 400aB of holes 400A and 400B are present at locations other than gap 401 between die pad 320 and punch 310 in this embodiment. That is, the narrower the gap 401 between the die pad 320 and the punch 310, the wider the existence range of the edges 400aA and 400aB in the circumferential direction of the holes 400A and 400B. In this embodiment, the edges 400aA and 400aB are present over substantially the entire circumference of the holes 400A and 400B. The edge portion 400aA is continuous with the first and second flange forming portions 313A, 324A, and the edge portion 400aB is continuous with the first and second flange forming portions 313B, 324B.
　図１２に示す通り、第１方向Ｐ１における幅広部３２３の先端縁部のうち一対のフランジ６４Ａ，６４Ｂが向かい合う短手方向Ｙ２における両端部３２３ｂ，３２３ｃは、湾曲形状を有している。本実施形態では、短手方向Ｙ２における幅広部３２３の両端部３２３ｂ，３２３ｃ間の長さをｔとした場合に、両端部３２３ｂ，３２３ｃのそれぞれの曲率半径ｒは、ｒ＜ｔ／２に設定されている。このような湾曲形状部が形成されていることで、幅広部３２３とフランジ予定部５４Ａ，５４Ｂ（フランジ６４Ａ，６４Ｂ）とを滑らかに接触させることができる。 As shown in FIG. 12, both end portions 323b and 323c in the lateral direction Y2 where the pair of flanges 64A and 64B face each other among the tip edge portions of the wide portion 323 in the first direction P1 have a curved shape. In this embodiment, when the length between both ends 323b and 323c of the wide portion 323 in the lateral direction Y2 is t, the radius of curvature r of each of the ends 323b and 323c is set to r<t/2. It is By forming such curved portions, the wide portion 323 and the pre-flange portions 54A and 54B ( flanges 64A and 64B) can be brought into smooth contact.
　なお、両端部３２３ｂ，３２３ｃは、図１３に示すように、湾曲形状に代えて面取形状を有していてもよい。図１３は、幅広部３２３の両端部３２３ｂ，３２３ｃの変形例を示す図である。この場合、面取部の長さＣは、Ｃ＜ｔ√２／２である。このような面取形状部が形成されていることで、幅広部３２３とフランジ予定部５４Ａ，５４Ｂ（フランジ６４Ａ，６４Ｂ）とを滑らかに接触させることができる。 Note that both ends 323b and 323c may have chamfered shapes instead of curved shapes, as shown in FIG. 13A and 13B are views showing modifications of both end portions 323b and 323c of the wide portion 323. FIG. In this case, the length C of the chamfer is C<t√2/2. By forming such a chamfered portion, the wide portion 323 and the pre-flange portions 54A and 54B ( flanges 64A and 64B) can be smoothly brought into contact with each other.
　図８～図１２に示すように、ダイ３３０は、パンチ３１０およびダイパッド３２０がワーク５０を挟んだ状態で、パンチ３１０側（プレス方向Ｐの第１方向Ｐ１側）に移動することで、ワーク５０をプレス成形品６０に成形する。 As shown in FIGS. 8 to 12, the die 330 moves toward the punch 310 (first direction P1 side of the pressing direction P) while the work 50 is sandwiched between the punch 310 and the die pad 320. is molded into a press-molded product 60.
　ダイ３３０は、短手方向Ｙ２に並ぶ一対の分割体３３１Ａ，３３１Ｂを有している。これに限らず、ダイ３３０は一つの金型であって、一つの金型の中に分割体３３１Ａ，３３１Ｂに相当する部位があってもよい。ダイパッド３２０は分割体３３１Ａ，３３１Ｂの間に配置される。ダイ３３０が一つの金型であれば、ダイパッド３２０はダイ３３０の内部に配置される。いずれにせよダイパッド３２０はダイ３３０の内部に配置される。一対の分割体３３１Ａ，３３１Ｂは、長手方向Ｘ２に細長い形状に形成されている。一対の分割体３３１Ａ，３３１Ｂは、図示しないアクチュエータによってプレス方向Ｐに一体的に移動可能に構成されている。一対の分割体３３１Ａ，３３１Ｂは、ダイパッド３２０とは独立してプレス方向Ｐに移動可能であり、ダイパッド３２０を短手方向Ｙ２に挟むように配置されている。 The die 330 has a pair of split bodies 331A and 331B aligned in the lateral direction Y2. The die 330 is not limited to this, and the die 330 may be one mold, and the parts corresponding to the divided bodies 331A and 331B may be included in one mold. Die pad 320 is arranged between divisions 331A and 331B. If the die 330 is a mold, the die pad 320 is placed inside the die 330 . In any event, die pad 320 is located inside die 330 . A pair of divided bodies 331A and 331B are formed in an elongated shape in the longitudinal direction X2. The pair of divided bodies 331A and 331B are configured to be integrally movable in the pressing direction P by an actuator (not shown). The pair of divided bodies 331A and 331B are movable in the press direction P independently of the die pad 320, and are arranged so as to sandwich the die pad 320 in the transverse direction Y2.
　一対の分割体３３１Ａ，３３１Ｂは、一対の縦壁成形部３３２Ａ，３３２Ｂと、一対の第３フランジ成形部３３３Ａ，３３３Ｂと、を有している。 The pair of divided bodies 331A, 331B has a pair of vertical wall forming portions 332A, 332B and a pair of third flange forming portions 333A, 333B.
　一対の縦壁成形部３３２Ａ，３３２Ｂは、一対の縦壁予定部５３Ａ，５３Ｂを一対の縦壁６３Ａ，６３Ｂに成形するために設けられている。一対の縦壁成形部３３２Ａ，３３２Ｂは、一対の分割体３３１Ａ，３３１Ｂの内側面に形成されている。本実施形態では、一対の縦壁成形部３３２Ａ，３３２Ｂの上部は、プレス方向Ｐと平行に延びており、短手方向Ｙ２と直交している。一対の縦壁成形部３３２Ａ，３３２Ｂと長手方向Ｘ２に並ぶようにして一対の第３フランジ成形部３３３Ａ，３３３Ｂが配置されている。 The pair of vertical wall forming portions 332A, 332B are provided to form the pair of vertical wall presumed portions 53A, 53B into the pair of vertical walls 63A, 63B. The pair of vertical wall forming portions 332A, 332B are formed on the inner side surfaces of the pair of divided bodies 331A, 331B. In this embodiment, the upper portions of the pair of vertical wall forming portions 332A and 332B extend parallel to the pressing direction P and are orthogonal to the lateral direction Y2. A pair of third flange forming portions 333A, 333B are arranged so as to be aligned with the pair of vertical wall forming portions 332A, 332B in the longitudinal direction X2.
　一対の第３フランジ成形部３３３Ａ，３３３Ｂは、一対の第１フランジ成形部３１３Ａ，３１３Ｂ、および一対の第２フランジ成形部３２４Ａ，３２４Ｂと協働して一対のフランジ６４Ａ，６４Ｂを成形する。一対の第３フランジ成形部３３３Ａ，３３３Ｂは、一対の分割体３３１Ａ，３３１Ｂの内側面に形成されている。一対の第３フランジ成形部３３３Ａ，３３３Ｂは、一対のフランジ予定部５４Ａ，５４Ｂのうち対向面５４ａＡ，５４ａＢとは反対側の面である外側面５４ｂＡ，５４ｂＢを受ける。一対の第３フランジ成形部３３３Ａ，３３３Ｂのうち、第１方向側端部３３３ａＡ，３３３ａＢを除く部分としての上部３３３ｂＡ，３３３ｂＢは、プレス方向Ｐと平行に延びている。長手方向Ｘ２から見て、第１方向側端部３３３ａＡ，３３３ａＢは、湾曲形状に形成されており、本実施形態では、円弧形状に形成されている。成形下死点ＰＬにおいて、第１方向側端部３３３ａＡ，３３３ａＢは、パンチ３１０の第１フランジ成形部３１３Ａ，３１３Ｂ側に向けて凸となる湾曲形状である。本実施形態では、第１方向側端部３３３ａＡ，３３３ａＢは、９０度の角度範囲に亘って形成されており、一対の分割体３３１Ａ，３３１Ｂの下端面に連続している。この下端面は、本実施形態では、水平面である。 A pair of third flange forming portions 333A, 333B cooperate with a pair of first flange forming portions 313A, 313B and a pair of second flange forming portions 324A, 324B to form a pair of flanges 64A, 64B. The pair of third flange forming portions 333A, 333B are formed on the inner side surfaces of the pair of split bodies 331A, 331B. The pair of third flange forming portions 333A and 333B receive outer side surfaces 54bA and 54bB of the pair of pre-flange portions 54A and 54B opposite to the facing surfaces 54aA and 54aB. Upper portions 333bA and 333bB of the pair of third flange forming portions 333A and 333B, excluding the first direction side end portions 333aA and 333aB, extend parallel to the pressing direction P. As shown in FIG. When viewed from the longitudinal direction X2, the first direction side end portions 333aA and 333aB are formed in a curved shape, and are formed in an arc shape in this embodiment. At the forming bottom dead center PL, the first direction side end portions 333aA and 333aB have a curved shape that protrudes toward the first flange forming portions 313A and 313B of the punch 310 . In this embodiment, the first direction side end portions 333aA and 333aB are formed over an angular range of 90 degrees and are continuous with the lower end surfaces of the pair of divided bodies 331A and 331B. This lower end surface is a horizontal surface in this embodiment.
　長手方向Ｘ２から見て、第１方向側端部３３３ａＡ，３３３ａＢの曲率半径が曲率半径Ｒである。また、成形下死点ＰＬにおいて、各フランジ成形部３１３Ａ，３３３Ａ；３１３Ｂ，３３３Ｂが設けられている箇所でのパンチ３１０とダイ３３０の互いの対向領域についてプレス方向Ｐの長さが、長さｈ１である。また、プレス方向Ｐにおける一対のフランジ６４Ａ，６４Ｂの高さが、高さｈ２である。なお、ワーク５０の板厚は、プレス成形装置３００におけるプレス方向Ｐのプレス動作量（ストローク）と比べて小さい。よって、高さｈ１の上端始点と高さｈ２の上端始点とは、実質的に同一の位置となる。本実施形態では、曲率半径Ｒは、１０ｍｍ≦Ｒ≦（ｈ１－ｈ２）ｍｍ（但しｈ１－ｈ２は１０ｍｍ以上）に設定されている。 The curvature radius R of the first direction side end portions 333aA and 333aB is the curvature radius R when viewed from the longitudinal direction X2. Further, at the forming bottom dead center PL, the length of the pressing direction P of the opposing regions of the punch 310 and the die 330 at the locations where the respective flange forming portions 313A, 333A; 313B, 333B are provided is the length h1 is. Also, the height of the pair of flanges 64A and 64B in the pressing direction P is height h2. The thickness of the workpiece 50 is smaller than the amount of press movement (stroke) in the press direction P in the press forming device 300 . Therefore, the starting point of the upper end of the height h1 and the starting point of the upper end of the height h2 are substantially at the same position. In this embodiment, the curvature radius R is set to 10 mm≦R≦(h1−h2) mm (where h1−h2 is 10 mm or more).
　このように、第１方向側端部３３３ａＡ，３３３ａＢの曲率半径Ｒを上記の下限以上とすることで、曲率半径Ｒを十分に大きな値にできる。その結果、フランジ予定部５４Ａ，５４Ｂをプレス成形装置３００で曲げ成形することでフランジ６４Ａ，６４Ｂに成形する際に、ダイ３３０を成形下死点ＰＬから成形上死点ＰＵに戻すときに生じる、フランジ６４Ａ，６４Ｂの曲げ戻し変形（曲げ－曲げ戻し作用）に起因する、縦壁６３Ａ，６３Ｂに生じるモーメント力（反りの要因）をより小さな値にできる。これにより、縦壁６３Ａ，６３Ｂおよびフランジ６４Ａ，６４Ｂの反り変形（フランジ６４Ａ，６４Ｂが第１方向Ｐ１に進むに従い外側面６４ｂＡ，６４ｂＢ側に沿った変形）を抑制でき、一対の縦壁６３Ａ，６３Ｂのそれぞれの先端の反り量Ｓ（壁開き量）を格段に小さくできる。反り量Ｓは、縦壁６３Ａの先端または縦壁６３Ｂの先端が、本来の位置から短手方向Ｙ１にどれだけ位置ずれしているかを示す値である。なお、本実施形態では、長手方向Ｘ２から見て、一対の縦壁成形部３３２Ａ，３３２Ｂの第１方向側端部は、第３フランジ成形部３３３Ａ，３３３Ｂの第１方向側端部３３３ａＡ，３３３ａＢと同じ形状に形成されている。 Thus, by setting the radius of curvature R of the first direction side end portions 333aA and 333aB to the above lower limit or more, the radius of curvature R can be set to a sufficiently large value. As a result, when forming the flanges 64A and 64B by bending the pre-flange portions 54A and 54B with the press forming device 300, the die 330 is returned from the forming bottom dead center PL to the forming top dead center PU. A moment force (cause of warpage) generated in the vertical walls 63A, 63B due to bending-back deformation (bending-bending-back action) of the flanges 64A, 64B can be reduced to a smaller value. As a result, warp deformation of the vertical walls 63A, 63B and the flanges 64A, 64B (deformation along the outer side surfaces 64bA, 64bB as the flanges 64A, 64B advance in the first direction P1) can be suppressed, and the pair of vertical walls 63A, The warp amount S (wall opening amount) of each tip of 63B can be remarkably reduced. The warp amount S is a value that indicates how much the tip of the vertical wall 63A or the tip of the vertical wall 63B is displaced from its original position in the lateral direction Y1. In the present embodiment, when viewed from the longitudinal direction X2, the first direction side end portions of the pair of vertical wall forming portions 332A and 332B correspond to the first direction side end portions 333aA and 333aB of the third flange forming portions 333A and 333B. formed in the same shape as
　次に、プレス成形装置３００でのプレス作業を説明する。プレス成形装置３００では、図１１に示すように、パンチ３１０のパンチ本体３１２にワーク５０が載せられた後、パッドとしてのダイパッド３２０が図示しないアクチュエータによって、ダイ３３０に先行してパンチ３１０側（第１方向Ｐ１）に移動される。これにより、ワーク５０がパンチ３１０およびダイパッド３２０に挟まれ、ダイパッド３２０は、ワーク５０の位置ずれを抑制する。このとき、ダイパッド３２０の幅広部３２３は、第２立上工程に先行してワーク５０の一対のフランジ予定部５４Ａ，５４Ｂ間に入る。すなわち、第１フランジ成形部３１３Ａ，３１３Ｂおよび第２フランジ成形部３２４Ａ，３２４Ｂは、第２立上工程に先行してワーク５０の一対のフランジ予定部５４Ａ，５４Ｂ間に入る。 Next, the press work in the press molding device 300 will be explained. In the press forming apparatus 300, as shown in FIG. 11, after the workpiece 50 is placed on the punch body 312 of the punch 310, the die pad 320 as a pad is driven by an actuator (not shown) to the punch 310 side (second die) ahead of the die 330. It is moved in one direction P1). As a result, the work 50 is sandwiched between the punch 310 and the die pad 320 , and the die pad 320 suppresses positional deviation of the work 50 . At this time, the wide portion 323 of the die pad 320 enters between the pair of pre-flange portions 54A and 54B of the workpiece 50 prior to the second rising step. That is, the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B enter between the pair of pre-flange portions 54A, 54B of the workpiece 50 prior to the second rising step.
　次に、図１２に示すように、ダイ３３０が図示しないアクチュエータによってパンチ３１０側（第１方向Ｐ１）に所定の成形下死点ＰＬまで移動されることで、パンチ３１０とダイ３３０とがプレス方向Ｐに接近する。このとき、一対の縦壁成形部３３２Ａ，３３２Ｂは、ワーク５０の縦壁予定部５３Ａ，５３Ｂをパンチ３１０の縦壁成形部３１６Ａ，３１６Ｂに押し当てることで、一対の縦壁予定部５３Ａ，５３Ｂを互いに近づける。これにより、一対の縦壁予定部５３Ａ，５３Ｂは一対の縦壁６３Ａ，６３Ｂに成形される。 Next, as shown in FIG. 12, the die 330 is moved toward the punch 310 (in the first direction P1) to a predetermined forming bottom dead center PL by an actuator (not shown), thereby moving the punch 310 and the die 330 in the pressing direction. approach P. At this time, the pair of vertical wall forming portions 332A and 332B are formed by pressing the planned vertical wall portions 53A and 53B of the workpiece 50 against the vertical wall forming portions 316A and 316B of the punch 310, thereby forming the pair of planned vertical wall portions 53A and 53B. bring closer to each other. As a result, the pair of vertical wall pre-determined portions 53A, 53B are molded into the pair of vertical walls 63A, 63B.
　また、ダイ３３０の一対の第３フランジ成形部３３３Ａ，３３３Ｂは、ワーク５０のフランジ予定部５４Ａ，５４Ｂをパンチ３１０の第１フランジ成形部３１３Ａ，３１３Ｂ、およびダイパッド３２０の第２フランジ成形部３２４Ａ，３２４Ｂに押し当てる。これにより、一対のフランジ予定部５４Ａ，５４Ｂは、互いに近づけられて一対のフランジ６４Ａ，６４Ｂに成形される。成形下死点ＰＬにおいて、ワーク５０のフランジ予定部６４Ａ，６４Ｂのうちパンチ３１０側の対向面６４ａＡ，６４ａＢに形成された凸部６５Ａ，６５Ｂは、穴４００Ａ，４００Ｂの中にある。 Further, the pair of third flange forming portions 333A, 333B of the die 330 press the flange-provisioning portions 54A, 54B of the workpiece 50 into the first flange forming portions 313A, 313B of the punch 310 and the second flange forming portions 324A, 324A of the die pad 320, 324B. As a result, the pair of pre-flange portions 54A and 54B are brought closer to each other and formed into the pair of flanges 64A and 64B. At the forming bottom dead center PL, the projections 65A, 65B formed on the facing surfaces 64aA, 64aB of the pre-flange portions 64A, 64B of the work 50 on the punch 310 side are inside the holes 400A, 400B.
　成形下死点ＰＬにおいて、穴４００Ａ，４００Ｂの中にある凸部６５Ａ，６５Ｂの周囲のワーク５０（フランジ予定部６４Ａ，６４Ｂ）は、ダイパッド３２０とパンチ３１０のプレス方向Ｐに沿った面（第１フランジ成形部３１３Ａ，３１３Ｂ、および第２フランジ成形部３２４Ａ，３２４Ｂ）と、ダイ３３０の第３フランジ成形部３３３Ａ，３３３Ｂと、に挟まれる。また、穴４００Ａ，４００Ｂの中にある凸部６５Ａ，６５Ｂとダイパッド３２０の間にはワーク５０が無い。換言すれば、穴４００Ａ，４００Ｂの中にある凸部６５Ａ，６５Ｂの側面とダイパッド３２０は、直接向かい合っている。すなわち、凸部６５Ａ，６５Ｂとダイパッド３２０の間には何もない。 At the molding bottom dead center PL, the workpiece 50 ( pre-flange portions 64A, 64B) around the projections 65A, 65B in the holes 400A, 400B is formed on the surface of the die pad 320 and the punch 310 along the pressing direction P (second 1 flange forming parts 313A, 313B and second flange forming parts 324A, 324B) and the third flange forming parts 333A, 333B of the die 330. Moreover, there is no workpiece 50 between the die pad 320 and the projections 65A, 65B in the holes 400A, 400B. In other words, the sides of the projections 65A, 65B in the holes 400A, 400B and the die pad 320 directly face each other. That is, there is nothing between the protrusions 65A and 65B and the die pad 320. FIG.
　また、パンチ３１０，ダイパッド３２０，およびダイ３３０が協働してベース予定部５１をベース６１に成形する。 Also, the punch 310 , the die pad 320 , and the die 330 work together to form the pre-base portion 51 on the base 61 .
　上述の説明から明らかなように、この第２立上工程では、一対のフランジ予定部５４Ａ，５４Ｂの間にプレス成形装置３００におけるプレス方向Ｐの一方側から第１フランジ成形部３１３Ａ，３１３Ｂを配置するとともにプレス方向Ｐの他方側から第２フランジ成形部３２４Ａ，３２４Ｂを配置する。この状態で、プレス成形装置３００のダイ３３０をプレス方向Ｐに沿ってパンチ３１０側に相対移動させる。これにより、一対の縦壁予定部５３Ａ，５３Ｂを互いに近づけて一対の縦壁６４Ａ，６４Ｂに成形し、且つ一対のフランジ予定部５４Ａ，５４Ｂを互いに近づけて一対のフランジ６４Ａ，６４Ｂに成形する。 As is clear from the above description, in the second rising step, the first flange forming portions 313A and 313B are arranged from one side in the pressing direction P in the press forming apparatus 300 between the pair of pre-flange portions 54A and 54B. At the same time, the second flange forming portions 324A and 324B are arranged from the other side in the pressing direction P. In this state, the die 330 of the press forming device 300 is relatively moved along the pressing direction P toward the punch 310 side. As a result, the pair of planned vertical wall portions 53A and 53B are brought closer together to form a pair of vertical walls 64A and 64B, and the pair of planned flange portions 54A and 54B are brought closer together and formed into a pair of flanges 64A and 64B.
　なお、プレス成形装置３００の金型は、長手方向Ｘ１に対称な形状に形成されている。これにより、一対のフランジ６４Ａ，６４Ｂと同様にして一対のフランジ６６Ａ，６６Ｂが成形される。その結果、ワーク５０は、プレス成形品６０となる。 The mold of the press molding device 300 is formed in a shape symmetrical with respect to the longitudinal direction X1. Thereby, a pair of flanges 66A, 66B are formed in the same manner as the pair of flanges 64A, 64B. As a result, the workpiece 50 becomes a press-formed product 60 .
　ワーク５０がプレス成形品６０となった後、ダイパッド３２０およびダイ３３０は、パンチ３１０に対して例えば同時に第２方向Ｐ２に移動することで成形上死点ＰＵに戻る。その後、プレス成形品６０は、パンチ３１０とダイパッド３２０とダイ３３０の何れとも干渉しない状態でパンチ３１０から取り出される。 After the workpiece 50 becomes the press-formed product 60, the die pad 320 and the die 330 are returned to the forming top dead center PU by simultaneously moving in the second direction P2 with respect to the punch 310, for example. After that, the press-formed product 60 is removed from the punch 310 without interfering with any of the punch 310 , the die pad 320 and the die 330 .
　以上説明したように、パンチ３１０とダイパッド３２０の間における空間をダイパッド３２０の幅広部３２３により補完しながらワーク５０をプレス成形品６０に成形することで、形状のずれ、ゆがみを矯正しながら、凸部６５Ａ，６５Ｂを含めた縦壁成形を実現できる。しかも、凸部６５Ａ，６５Ｂを成形した後にフランジ６４Ａ，６４Ｂを成形する工程を実現できる。よって、例えば既存制約内での工程において、対向配置された凸部６５Ａ，６５Ｂを有するサスペンションアーム部品の成形を実現できる。また、凸部６５Ａ，６５Ｂを対向配置することで、プレス成形品６０と車体との締結を担うカラー部品を統合省略する一体構造のサスペンションアームを実現できる。 As described above, by forming the workpiece 50 into the press-formed product 60 while filling the space between the punch 310 and the die pad 320 with the wide portion 323 of the die pad 320, the deviation and distortion of the shape are corrected, and the convex shape is formed. Vertical wall molding including the portions 65A and 65B can be realized. Moreover, the step of forming the flanges 64A and 64B after forming the convex portions 65A and 65B can be realized. Therefore, for example, in a process within the existing restrictions, it is possible to realize molding of a suspension arm component having convex portions 65A and 65B arranged opposite to each other. Further, by arranging the protrusions 65A and 65B to face each other, it is possible to realize a suspension arm having an integral structure in which the collar parts for fastening the press-molded product 60 and the vehicle body are integrated and omitted.
　なお、本発明の解決課題の一つである、フランジ６４Ａ，６４Ｂの形状ゆがみ抑制のためには、上記パンチ３１０とダイパッド３２０の構造が想到される前の従来技術下において、フランジ予定部５４Ａ，５４Ｂ間の空洞箇所を何らかの金型構造の工夫で埋める必要があった。このため、本願発明者は、当初は、プレス成形装置３００に相当するプレス成形装置でのパンチの形状を工夫し、長手方向と直交する断面形状を凸型（第１フランジ成形部３１３Ａ，３１３Ｂおよびストッパ３１４を含む形状）からＩ型（第１フランジ成形部３１３Ａ，３１３Ｂの上端に第２フランジ成形部３２４Ａ，３２４Ｂに相当する形状を追加した形状）に変更することを検討した。しかしながら、プレス成形品の量産工程まで踏まえると、成形完了後にプレス成形品をプレス成形装置から持ち上げて取り出すことが必要である。このため、上記Ｉ型断面では凸部とパンチとの干渉が避けられず、パンチからのプレス成形品の取り出し作業が不可能であった。更なる検討の結果、上型パッドとしてのダイパッド３２０に突起部、すなわち幅広部３２３を設ける方案とすることで、成形終了後における、パンチ３１０からダイパッド３２０とダイ３３０を隔離させるタイミングで凸部とパンチとの干渉を回避することができ、フランジの形状のゆがみを抑制する課題を量産工程で解決することができた。 In addition, in order to suppress the shape distortion of the flanges 64A and 64B, which is one of the problems to be solved by the present invention, the planned flange portions 54A, It was necessary to fill the void between 54B by some kind of contrivance of the mold structure. For this reason, the inventor of the present application initially devised the shape of the punch in the press forming device corresponding to the press forming device 300, and made the cross-sectional shape perpendicular to the longitudinal direction convex (first flange forming portions 313A, 313B and (shape including stopper 314) to I-shape (shape in which shapes corresponding to second flange formed portions 324A and 324B are added to the upper ends of first flange formed portions 313A and 313B). However, considering the mass production process of press-formed products, it is necessary to lift and take out the press-formed products from the press-forming apparatus after the completion of the forming. For this reason, in the I-shaped cross section, interference between the convex portion and the punch was unavoidable, making it impossible to take out the press-formed product from the punch. As a result of further investigation, it was found that the die pad 320 as the upper mold pad is provided with a projection, that is, a wide width portion 323, so that the projection and the die pad 320 and the die 330 are separated from the punch 310 after the molding is completed. Interference with the punch can be avoided, and the problem of suppressing distortion of the shape of the flange can be solved in the mass production process.
　以上説明したように、本実施形態によると、プレス成形装置３００によってワーク５０からプレス成形品６０をプレス成形する時に、パンチ３１０とダイパッド３２０は、凸部６５Ａ，６５Ｂを避けつつ、プレス方向Ｐにおける凸部６５Ａ，６５Ｂの両側からフランジ予定部５４Ａ，５４Ｂを受け止めることができる。よって、凸部６５Ａ，６５Ｂとパンチ３１０およびダイパッド３２０との干渉を防止でき、且つ、一対のフランジ予定部５４Ａ，５４Ｂ（フランジ６４Ａ，６４Ｂ）にゆがみが生じることを抑制できる。すなわち、一対のフランジ予定部５４Ａ，５４Ｂ間においてプレス方向Ｐの両側から第１フランジ成形部３１３Ａ，３１３Ｂと第２フランジ成形部３２４Ａ，３２４Ｂが配置されることで、一対のフランジ予定部５４Ａ，５４Ｂが一対のフランジ６４Ａ，６４Ｂに成形される際のフランジ６４Ａ，６４Ｂの形状のゆがみを抑制できる。よって、フランジ６４Ａ，６４Ｂの不要な変形を抑制でき、寸法精度の高いプレス成形品６０を製造できる。 As described above, according to the present embodiment, when the press forming device 300 press-forms the press-formed product 60 from the workpiece 50, the punch 310 and the die pad 320 move in the press direction P while avoiding the convex portions 65A and 65B. The pre-flange portions 54A and 54B can be received from both sides of the convex portions 65A and 65B. Therefore, the protrusions 65A, 65B can be prevented from interfering with the punch 310 and the die pad 320, and the pair of pre-flange portions 54A, 54B ( flanges 64A, 64B) can be prevented from being distorted. That is, by arranging the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B from both sides in the pressing direction P between the pair of pre-flange portions 54A, 54B, the pair of pre-flange portions 54A, 54B are arranged. It is possible to suppress distortion of the shape of the flanges 64A, 64B when forming the pair of flanges 64A, 64B. Therefore, unnecessary deformation of the flanges 64A and 64B can be suppressed, and the press-formed product 60 with high dimensional accuracy can be manufactured.
　しかも、本実施形態では、バーリング成形工程で凸部６５Ａ，６５Ｂを成形した後に立上工程（第１立上工程および第２立上工程）を行う。第２立上工程では、プレス成形装置３００のパンチ３１０、ダイパッド３２０、およびダイ３００が一直線方向であるプレス方向Ｐにのみ相対移動することで、ワーク５０のフランジ予定部５４Ａ，５４Ｂ間への第１フランジ成形部３１３Ａ，３１３Ｂおよび第２フランジ成形部３２４Ａ，３２４Ｂの挿入と、フランジ予定部５４Ａ，５４Ｂ間からの第１フランジ成形部３１３Ａ，３１３Ｂおよび第２フランジ成形部３２４Ａ，３２４Ｂの取り出しを行える。このように、パンチ３１０、ダイパッド３２０、およびダイ３００の簡素な動作による簡素な工法で、ワーク５０をプレス成形品６０に成形できる。その結果、立上工程の後に多くの追加工程を必要とするバーリング加工を行わなくて済む。このため、一対のフランジ６４Ａ，６４Ｂ間の狭い空間にバーリング成形用のパンチおよびダイを配置して一対のフランジにバーリング成形を施す必要がない。よって、バーリング金型のパンチとダイを多方向に動作させる構成が不要となるため、バーリング成形工程を１工程もしくは最小限の複数工程（ステップＳ３）で済ますことができる。その結果、制約のある既存設備を用いる場合であっても、バーリング成形加工を行うことが、簡素な工法で大幅な工程追加、つまりはコスト上昇を招かずに可能となる。 Moreover, in this embodiment, the rising process (the first rising process and the second rising process) is performed after the projections 65A and 65B are formed in the burring forming process. In the second start-up process, the punch 310, the die pad 320, and the die 300 of the press forming device 300 relatively move only in the pressing direction P, which is a straight line direction, so that the work 50 is moved between the pre-flange portions 54A and 54B. It is possible to insert the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B, and to take out the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B from between the pre-flange portions 54A, 54B. . In this manner, the workpiece 50 can be formed into the press-formed product 60 by a simple construction method using simple operations of the punch 310 , the die pad 320 and the die 300 . As a result, there is no need to perform burring that requires many additional steps after the rising step. Therefore, it is not necessary to place a punch and die for burring forming in the narrow space between the pair of flanges 64A and 64B to perform burring forming on the pair of flanges. Therefore, since the punch and die of the burring mold do not need to be configured to move in multiple directions, the burring process can be completed with one process or a minimum of multiple processes (step S3). As a result, even when existing facilities with restrictions are used, it is possible to carry out the burring process with a simple construction method without adding a large amount of processes, that is, without incurring an increase in cost.
　なお、本願発明者は、プレス成形装置３００を用いた第２立上工程において、第１フランジ成形部３１３Ａ，３１３Ｂと第２フランジ成形部３２４Ａ，３２４Ｂとを設けることで一対のフランジ６４Ａ，６４Ｂにおけるゆがみ発生を抑制できる効果について、コンピュータシミュレーションを行った。具体的には、本実施形態のプレス成形装置３００を用いて第２立上工程が行われた構成を実施例とし、幅広部３２３（第２フランジ成形部３２４Ａ，３２４Ｂ）が設けられていない点以外は実施例と同じ構成を比較例とした。そして、プレス成形品６０の引張強度が７８０ＭＰａ、板厚＝２．３ｍｍの条件下において、実施例での製品であるプレス成形品６０と、比較例での製品であるプレス成形品とについて、フランジ６４Ａ，６４Ｂにゆがみがどのように生じたかを比較した。より具体的には、フランジ６４Ａ，６４Ｂにおいて、高さ方向Ｚ１におけるベース６１側の一端部６４１Ａ，６４１Ｂ（図１）が、対応する他端部６４２Ａ，６４２Ｂに対して短手方向Ｙ１の内側にどれだけ位置ずれしているかを測定した。比較例では、一端部６４１Ａが他端部６４２Ａに対して約１．２６ｍｍ位置ずれしており、また、一端部６４１Ｂが他端部６４２Ｂに対して約１．２６ｍｍ位置ずれしていた。一方、実施例では、このような位置ずれは生じておらず、一対のフランジ予定部５４Ａ，５４Ｂが一対のフランジ６４Ａ，６４Ｂに成形される際のフランジ６４Ａ，６４Ｂの形状のゆがみを顕著に抑制できた。 In addition, the inventor of the present application provided the first flange forming portions 313A and 313B and the second flange forming portions 324A and 324B in the second start-up process using the press forming apparatus 300, so that the pair of flanges 64A and 64B A computer simulation was performed on the effect of suppressing the occurrence of distortion. Specifically, the configuration in which the second rising step is performed using the press forming apparatus 300 of the present embodiment is taken as an example, and the wide portion 323 (second flange forming portions 324A and 324B) is not provided. Except for this, the same configuration as the example was used as a comparative example. Then, under the conditions that the press-formed product 60 has a tensile strength of 780 MPa and a plate thickness of 2.3 mm, the press-formed product 60, which is the product of the example, and the press-formed product, which is the product of the comparative example, A comparison was made on how the distortion occurred in 64A and 64B. More specifically, in the flanges 64A and 64B, one ends 641A and 641B (FIG. 1) on the side of the base 61 in the height direction Z1 are arranged inside the corresponding other ends 642A and 642B in the lateral direction Y1. We measured how much the position was shifted. In the comparative example, the one end 641A is displaced from the other end 642A by about 1.26 mm, and the one end 641B is displaced from the other end 642B by about 1.26 mm. On the other hand, in the embodiment, such positional deviation does not occur, and distortion of the shape of the flanges 64A, 64B when the pair of pre-flange portions 54A, 54B are formed into the pair of flanges 64A, 64B is significantly suppressed. did it.
　また、本実施形態によると、プレス方向Ｐにおいて、プレス成形装置３００の第１フランジ成形部３１３Ａ，３１３Ｂは、一対のフランジ予定部５４Ａ，５４Ｂの一端（下端）間に配置され、第２フランジ成形部３２４Ａ，３２４Ｂは、一対のフランジ予定部５４Ａ，５４Ｂの他端（上端）間に配置される。この構成によると、フランジ予定部５４Ａ，５４Ｂのうち、プレス方向Ｐにおける一対のフランジ６４Ａ，６４Ｂの一対の端部の双方にフランジ予定部６４Ａ，６４Ｂを受ける金型部分が配置されることで、第２立上工程におけるフランジ６４Ａ，６４Ｂのゆがみを抑制できる。このように、フランジ６４Ａ，６４Ｂのゆがみが最も発生し易い箇所においてフランジ６４Ａ，６４Ｂ間で第１フランジ成形部３１３Ａ，３１３Ｂおよび第２フランジ成形部３２４Ａ，３２４Ｂが配置されてこのゆがみを抑制できるので、フランジ６４Ａ，６４Ｂの寸法精度をより高くできる。 Further, according to the present embodiment, in the press direction P, the first flange forming portions 313A and 313B of the press forming device 300 are arranged between one end (lower end) of the pair of pre-flange portions 54A and 54B, and the second flange forming portion The portions 324A and 324B are arranged between the other ends (upper ends) of the pair of pre-flange portions 54A and 54B. According to this configuration, by arranging the mold portions for receiving the planned flange portions 64A and 64B at both ends of the pair of flanges 64A and 64B in the pressing direction P, Distortion of the flanges 64A and 64B in the second rising process can be suppressed. In this manner, the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B are arranged between the flanges 64A, 64B at locations where the flanges 64A, 64B are most likely to be distorted, thereby suppressing this distortion. , the dimensional accuracy of the flanges 64A and 64B can be increased.
　また、本実施形態によると、第２立上工程において、一対の凸部６５Ａ，６５Ｂ間においてストッパ３１４が一対の凸部６５Ａ，６５Ｂを受けることができる。これにより、一対の凸部６５Ａ，６５Ｂ間の間隔が要求される部品の寸法に対し過度に狭くならずに済み、プレス成形品６０の寸法精度をより高くできる。 Further, according to the present embodiment, the stopper 314 can receive the pair of protrusions 65A and 65B between the pair of protrusions 65A and 65B in the second rising process. As a result, the distance between the pair of protrusions 65A and 65B does not become excessively narrow with respect to the required dimensions of the component, and the dimensional accuracy of the press-formed product 60 can be increased.
　また、本実施形態によると、第２立上工程において、プレス成形装置３００の第２フランジ成形部３２４Ａ，３２４Ｂは、プレス方向Ｐにおけるベース予定部５１寄りの箇所（第２方向Ｐ２側部分）に配置されている。この構成によると、ダイパッド３２０に第２フランジ成形部３２４Ａ，３２４Ｂを設ける構成を簡易に実現できる。 Further, according to the present embodiment, in the second start-up process, the second flange forming portions 324A and 324B of the press forming device 300 are positioned near the planned base portion 51 in the pressing direction P (the portion on the second direction P2 side). are placed. According to this configuration, the configuration in which the die pad 320 is provided with the second flange forming portions 324A and 324B can be easily realized.
　また、本実施形態によると、プレス方向Ｐにおいて、プレス成形装置３００のストッパ３１４の先端面３１４ａは、パンチ３１０のうちダイパッド３２０側の先端（上端、ベース成形部３１５）から奥まった箇所に配置されている。この構成によると、パンチ３１０のベース成形部３１５からプレス方向Ｐの第１方向Ｐ１側に進んだ箇所に第２フランジ成形部３２４Ａ，３２４Ｂを配置することができる。これにより、凸部６５Ａ，６５Ｂ間に配置されるストッパ３１４からより近い箇所で第２フランジ成形部３２４Ａ，３２４Ｂが一対のフランジ６４Ａ，６４Ｂを受けることができる。よって、第２フランジ成形部３２４Ａ，３２４Ｂと一対のフランジ６４Ａ，６４Ｂの対向面６４ａＡ，６４ａＢとが対向する面積をより多くできる。その結果、一対のフランジ６４Ａ，６４Ｂのゆがみを第２フランジ成形部３２４Ａ，３２４Ｂが抑制する効果をより高くできる。 Further, according to the present embodiment, in the pressing direction P, the tip surface 314a of the stopper 314 of the press forming device 300 is arranged at a position recessed from the tip of the punch 310 on the die pad 320 side (the upper end, the base forming portion 315). ing. According to this configuration, the second flange forming portions 324A and 324B can be arranged at positions advanced from the base forming portion 315 of the punch 310 toward the first direction P1 side of the pressing direction P. As shown in FIG. As a result, the second flange forming portions 324A, 324B can receive the pair of flanges 64A, 64B at positions closer to the stopper 314 arranged between the convex portions 65A, 65B. Therefore, the area where the second flange forming portions 324A, 324B and the opposing surfaces 64aA, 64aB of the pair of flanges 64A, 64B face each other can be increased. As a result, the effect of suppressing the distortion of the pair of flanges 64A, 64B by the second flange forming portions 324A, 324B can be enhanced.
　また、本実施形態によると、第１フランジ成形部３１３Ａ，３１３Ｂはパンチ３１０に設けられており、第２フランジ成形部３２４Ａ，３２４Ｂはダイパッド３２０に設けられている。この構成によると、第１フランジ成形部３１３Ａ，３１３Ｂ、および第２フランジ成形部３２４Ａ，３２４Ｂについて、専用の金型を設ける必要がない。さらに、本実施形態では、ストッパ３１４はパンチ３１０に設けられている。よって、ストッパ３１４についても専用の金型を設ける必要がない。 Further, according to this embodiment, the first flange forming portions 313A and 313B are provided on the punch 310, and the second flange forming portions 324A and 324B are provided on the die pad 320. According to this configuration, there is no need to provide a dedicated mold for the first flange forming portions 313A, 313B and the second flange forming portions 324A, 324B. Furthermore, in this embodiment, the stopper 314 is provided on the punch 310 . Therefore, it is not necessary to provide a dedicated mold for the stopper 314 as well.
　以上、本発明の実施形態および変形例について説明した。しかしながら、本発明は、上述の実施形態および変形例に限定されず、請求の範囲に記載の範囲内において、種々の変更が可能である。 The embodiments and modifications of the present invention have been described above. However, the present invention is not limited to the above-described embodiments and modifications, and various modifications are possible within the scope of the claims.
　例えば、上述の実施形態および変形例では、プレス成形装置２００を用いた第１立上工程によって中間成形品４０からワーク５０が成形され、次いで、プレス成形装置３００を用いた第２立上工程によってワーク５０からプレス成形品６０が成形された。しかしながら、この通りでなくてもよい。例えば、図１４に示すように、中間成形品４０は、プレス成形装置３００を用いた１つの立上工程によってプレス成形品６０に成形されてもよい。この場合、中間成形品４０からプレス成形品６０となる途中段階で、中間成形品４０が僅かの間だけワーク５０となり、その後、プレス動作の進行に伴って、ワーク５０がプレス成形品６０となる。 For example, in the above-described embodiments and modifications, the workpiece 50 is formed from the intermediate molded product 40 by the first rising process using the press molding device 200, and then the second rising process using the press molding device 300. A press-formed product 60 was formed from the workpiece 50 . However, this need not be the case. For example, as shown in FIG. 14, the intermediate product 40 may be formed into the press-formed product 60 by one rising process using the press-forming device 300. FIG. In this case, the intermediate molded product 40 becomes the workpiece 50 for a short period of time in the middle of the transition from the intermediate molded product 40 to the press molded product 60, and then the workpiece 50 becomes the press molded product 60 as the press operation progresses. .
　また、ワーク５０のフランジ予定部６４Ａ，６４Ｂのそれぞれに凸部６５Ａ，６５Ｂが形成される構成に限らず、フランジ予定部６４Ａ，６４Ｂの何れか一方のみに凸部６５Ａまたは凸部６５Ｂが形成されてもよい。 Further, the configuration in which the projecting portions 65A and 65B are formed respectively on the pre-flange portions 64A and 64B of the workpiece 50 is not limited, and the projecting portion 65A or the protruding portion 65B is formed on only one of the pre-flange portions 64A and 64B. may
　また、ワーク５０の凸部６５Ａ，６５Ｂは、バーリング加工によって成形された構成に限らない。例えば、ウエルドナットなどのワーク５０に部品が取り付けられることで凸部６５Ａ，６５Ｂが形成されてもよいし。ワークをプレス成形することなどによって素材を膨出することで凸部が形成されてもよい。 Also, the convex portions 65A and 65B of the workpiece 50 are not limited to being formed by burring. For example, the protrusions 65A and 65B may be formed by attaching parts to the workpiece 50 such as weld nuts. The projections may be formed by expanding the material by press molding the workpiece or the like.
　本発明は、プレス成形装置、およびプレス成形品の製造方法として適用できる。 The present invention can be applied as a press molding device and a method for manufacturing a press molded product.
５０　ワーク
６５Ａ，６５Ｂ　凸部
３００　プレス成形装置
３１０　パンチ
３１３Ａ，３１３Ｂ　第１フランジ成形部（プレス方向に沿った面）
３２０　ダイパッド
３２４Ａ，３２４Ｂ　第２フランジ成形部（プレス方向に沿った面）
３３０　ダイ
４００Ａ，４００Ｂ　穴
４００ａＡ，４００ａＢ　穴の縁部
Ｐ　プレス方向
ＰＬ　成形下死点 50 Workpieces 65A, 65B Convex portion 300 Press forming device 310 Punches 313A, 313B First flange forming portion (surface along the pressing direction)
320 die pads 324A, 324B second flange forming portion (surface along the pressing direction)
330 Dies 400A, 400B Holes 400aA, 400aB Hole edge P Pressing direction PL Forming bottom dead center

Claims (2)

  1. 　ダイとパンチとダイパッドを備え、
    　前記ダイパッドは前記ダイの内側に配置され、
    　前記ダイパッドは前記パンチと対向して配置され、
    　成形下死点において、前記ダイパッドと前記パンチのプレス方向に沿った面に穴があり、
    　前記成形下死点において、前記面は前記ダイと向かい合い、
    　前記穴の縁部は前記ダイパッドと前記パンチによって構成される
    プレス成形装置。     Equipped with a die, a punch and a die pad,
    the die pad is positioned inside the die;
    The die pad is arranged to face the punch,
    At the bottom dead center of molding, the die pad and the punch have a hole in the plane along the pressing direction,
    at the forming bottom dead center, the surface faces the die;
    A press molding device in which the edge of the hole is formed by the die pad and the punch.
  2. 　請求項１に記載のプレス成形装置を使用し、
    　前記パンチと前記ダイパッドでワークを挟むこと、
    　前記パンチと前記ダイとを前記プレス方向に接近させること、
    を備え、
    　前記ワークは前記パンチ側の面に凸部を備え、
    　前記成形下死点において、前記凸部は前記穴の中にあり、
    　前記穴の中にある前記凸部の周囲のワークは前記ダイパッドと前記パンチの前記プレス方向に沿った前記面と前記ダイとに挟まれ、
    　前記穴の中にある前記凸部と前記ダイパッドの間には前記ワークが無い、
    プレス成形品の製造方法。     Using the press molding device according to claim 1,
    sandwiching the workpiece between the punch and the die pad;
    bringing the punch and the die closer together in the pressing direction;
    with
    The workpiece has a convex portion on the punch side surface,
    at the molding bottom dead center, the protrusion is in the hole;
    The workpiece around the protrusion in the hole is sandwiched between the die pad and the surface of the punch along the pressing direction and the die;
    There is no workpiece between the convex portion in the hole and the die pad,
    A method for manufacturing a press-molded product.
PCT/JP2022/047435 2021-12-28 2022-12-22 Press-forming apparatus and method for producing press-formed article WO2023127695A1 (en)

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JP2021213861 2021-12-28

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010120060A (en) * 2008-11-20 2010-06-03 Nissan Motor Co Ltd Press formed product, and method and apparatus for manufacturing the same
WO2016075937A1 (en) * 2014-11-12 2016-05-19 新日鐵住金株式会社 Manufacturing method and manufacturing device for press-molded article
WO2016104376A1 (en) * 2014-12-22 2016-06-30 新日鐵住金株式会社 Method for manufacturing component with hat-shaped cross section

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010120060A (en) * 2008-11-20 2010-06-03 Nissan Motor Co Ltd Press formed product, and method and apparatus for manufacturing the same
WO2016075937A1 (en) * 2014-11-12 2016-05-19 新日鐵住金株式会社 Manufacturing method and manufacturing device for press-molded article
WO2016104376A1 (en) * 2014-12-22 2016-06-30 新日鐵住金株式会社 Method for manufacturing component with hat-shaped cross section

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