WO2023127695A1 - Appareil de formage à la presse et procédé de production d'un article formé à la presse - Google Patents

Appareil de formage à la presse et procédé de production d'un article formé à la presse 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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Prior art keywords
press
portions
pair
forming
flange
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PCT/JP2022/047435
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English (en)
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/fr

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

Definitions

  • the present invention relates to a 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

L'invention concerne un appareil de formage à la presse 300 comprenant une matrice 330, un poinçon 310 et un patin de matrice 320. Le patin de matrice 320 est disposé à l'intérieur de la matrice 330. Le patin de matrice 320 est disposé de façon à faire face au poinçon 310. Au niveau d'un point mort bas de moulage PL, des trous 400A, 400B sont formés dans une surface (première et seconde parties de moulage de bride 313A, 313B, 324A, 324B) le long d'une direction de pressage P du poinçon 310 et du patin de matrice 320. Au niveau du point mort bas de moulage PL, ladite surface fait face à la matrice 330. Les rebords 400aA, 400aB des trous 400A, 400B sont constitués par le patin de matrice 320 et le poinçon 310.
PCT/JP2022/047435 2021-12-28 2022-12-22 Appareil de formage à la presse et procédé de production d'un article formé à la presse WO2023127695A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-213861 2021-12-28
JP2021213861 2021-12-28

Publications (1)

Publication Number Publication Date
WO2023127695A1 true WO2023127695A1 (fr) 2023-07-06

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010120060A (ja) * 2008-11-20 2010-06-03 Nissan Motor Co Ltd プレス成形品、プレス成形品の製造方法および製造装置
WO2016075937A1 (fr) * 2014-11-12 2016-05-19 新日鐵住金株式会社 Procédé de fabrication et dispositif de fabrication d'un article moulé par compression
WO2016104376A1 (fr) * 2014-12-22 2016-06-30 新日鐵住金株式会社 Procédé de fabrication de composant ayant une coupe transversale en forme de chapeau

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010120060A (ja) * 2008-11-20 2010-06-03 Nissan Motor Co Ltd プレス成形品、プレス成形品の製造方法および製造装置
WO2016075937A1 (fr) * 2014-11-12 2016-05-19 新日鐵住金株式会社 Procédé de fabrication et dispositif de fabrication d'un article moulé par compression
WO2016104376A1 (fr) * 2014-12-22 2016-06-30 新日鐵住金株式会社 Procédé de fabrication de composant ayant une coupe transversale en forme de chapeau

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