WO2022075373A1 - 金型及びプレス成形装置 - Google Patents

金型及びプレス成形装置 Download PDF

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Publication number
WO2022075373A1
WO2022075373A1 PCT/JP2021/037023 JP2021037023W WO2022075373A1 WO 2022075373 A1 WO2022075373 A1 WO 2022075373A1 JP 2021037023 W JP2021037023 W JP 2021037023W WO 2022075373 A1 WO2022075373 A1 WO 2022075373A1
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WO
WIPO (PCT)
Prior art keywords
mold
stiffening member
lower mold
stiffening
center
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/037023
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English (en)
French (fr)
Japanese (ja)
Inventor
諒 漆畑
泰弘 伊藤
匡浩 中田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to EP21877672.2A priority Critical patent/EP4227018A4/en
Priority to CN202180067899.7A priority patent/CN116348217A/zh
Priority to JP2022555539A priority patent/JP7513917B2/ja
Priority to US18/028,762 priority patent/US20230330733A1/en
Publication of WO2022075373A1 publication Critical patent/WO2022075373A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0209—Tools therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • 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
    • B21D22/02—Stamping using rigid devices or tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/02—Die-cushions
    • 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
    • B21D37/00—Tools as parts of machines covered by this subclass
    • B21D37/20—Making tools by operations not covered by a single other subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
    • B21D5/0272—Deflection compensating means

Definitions

  • This disclosure relates to dies and press molding equipment.
  • Japanese Patent Application Laid-Open No. 7-323400 describes a lower frame in which a panel as a lower die is arranged and an upper frame in which a panel as an upper die is arranged.
  • the press die to have is disclosed.
  • An oblique rib extending from the lower part to the upper part is provided inside the lower mold of JP-A-7-323400.
  • Japanese Patent Application Laid-Open No. 61-266147 discloses a press die having a lower die and an upper die.
  • the lower mold of JP-A-61-266147 provides a bottom plate portion, a pair of side plate portions that stand vertically from the bottom plate portion, and a pair of upper plate portions that are connected to the pair of side plate portions. ..
  • Each of the pair of upper plate portions is inclined and extends toward each other from the side plate portion toward the upper side.
  • the pair of upper plate portions are connected to the forming portion as the upper part of the lower mold.
  • Japanese Patent No. 5458341 a press forming die having a frame-shaped base formed by a rod-shaped member in a rectangular shape in a plan view and a rod-shaped member vertically descending from four corners of the base, respectively.
  • the type is disclosed.
  • the lower mold of Japanese Patent No. 5458341 is a lower rod-shaped member arranged in parallel with an upper rod-shaped member corresponding to one side of a rectangular frame and an upper rod-shaped member under the upper rod-shaped member. It has a member and a rod-shaped reinforcing member that diagonally connects between the upper rod-shaped member and the lower rod-shaped member.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 4955923 Patent Document 2: Japanese Patent Application Laid-Open No. 7-323400 Patent Document 3: Japanese Patent Application Laid-Open No. 61-266147 Patent Document 4: Japanese Patent Application Laid-Open No. 5458341
  • a die face for molding is formed by the upper surface of the top of the lower mold or the upper surface of the insert placed on the top. Therefore, the deflection of the top of the lower mold leads to the deflection of the die face. As a result, there arises a problem in the ease of molding in press molding and the quality of the press-molded product as a product, or the development of a die becomes difficult. It should be noted that the bending of the mold that causes such a problem can be formed not only on the top of the lower mold but also on the top of the upper mold, which is a region on the work piece side.
  • Japanese Patent No. 4955923 discloses a technique for improving the structure of a bolster of a press machine.
  • a support portion in which vertical flat plate-shaped members are combined in a cross shape is provided upright on the floor portion of the internal space of the bed. It is said that by supporting the center of the lower surface of the bolster from below by this support portion, the bending of the bolster is suppressed and high-precision press molding can be realized.
  • the oblique ribs extend from the center side of the lower frame toward the outer end portion in a side view. Therefore, in the case of the press mold of JP-A-7-323400, it is not possible to efficiently support the central side where a large deflection occurs in the upper part of the lower mold which is the work material side. Further, in the case of the press mold of JP-A-7-323400, since the lower part of the lower frame is not in contact with the floor surface, the diagonal rib connected to the lower part of the lower frame and the floor surface are pressed during press molding. Load is difficult to transmit. That is, in Japanese Patent Application Laid-Open No. 7-323400, suppressing the bending of the mold itself is not sufficiently considered.
  • the upper plate portion arranged inside extends inclined toward the upper side, so that the upper part of the lower die is extended. It is also conceivable that the central side of the eggplant forming portion is supported to some extent by the upper plate portion.
  • the upper plate portion is not directly connected to the bottom plate portion on the ground contact portion side, and the upper plate portion is passed through the side plate portion as a vertical straight portion. It is indirectly connected to the bottom plate.
  • the structure of the upper part of the lower mold is not a plate shape but a frame mold.
  • the reinforcing material extends at one side of the rectangular frame shape, that is, at the position of the end portion, in a vertical plane formed between the upper rod-shaped member and the lower rod-shaped member. Therefore, the reinforcing material supports only one side of the end portion in the upper part of the lower mold, and cannot efficiently support the central side of the upper part, which is the work material side, which causes a large deflection during press molding. .. That is, in Japanese Patent No. 5458341, suppressing the bending of the mold itself is not sufficiently considered.
  • the mold according to the first aspect of the present disclosure is a mold having a first mold and a second mold, and at least one of the first mold and the second mold has a plate-shaped bottom. And the plate-shaped top provided away from the bottom, one end is directly connected to the bottom, the other end is connected to the top, and the side where the center of the top is located from the connection with the bottom from the bottom side to the top side. It has a stiffening member that extends incline toward.
  • the press molding apparatus includes a support device, a slide that descends during press molding, and a mold according to the first aspect, which is arranged between the support device and the slide. ..
  • the die itself can be directly and relatively easily improved to suppress the bending of the work material side of the die and the press molding.
  • Equipment can be provided.
  • FIG. 1 is a front view illustrating the configuration of the press molding apparatus according to the first embodiment by cutting a part thereof.
  • FIG. 2 is a front view illustrating a state in which the press machine and the die included in the press molding apparatus according to the first embodiment are bent, by cutting a part thereof.
  • FIG. 3 is an enlarged front view for explaining a state in which the lower mold according to the first embodiment is bent by cutting a part thereof.
  • FIG. 4 is a front view illustrating a state in which the press machine and the die included in the press forming apparatus according to the comparative example are bent, by cutting a part thereof.
  • FIG. 5 is an enlarged front view for explaining a state in which the lower mold according to the comparative example is bent by cutting a part thereof.
  • FIG. 1 is a front view illustrating the configuration of the press molding apparatus according to the first embodiment by cutting a part thereof.
  • FIG. 2 is a front view illustrating a state in which the press machine and the die included in the press molding apparatus according to the first
  • FIG. 6 is a perspective view illustrating the structure of the lower mold model for analysis corresponding to the lower mold according to the first embodiment.
  • FIG. 7 is a graph showing the amount of deflection of the lower mold according to the embodiment of the first embodiment and the amount of deflection of the lower mold according to the comparative example, calculated using the mold model for analysis.
  • FIG. 8A is a front view illustrating a configuration in which a stiffening member is provided only on one side in the left-right direction in the lower mold according to the modified example of the first embodiment.
  • FIG. 8B is a front view illustrating a configuration when two pairs of stiffeners are provided on the left and right sides of the lower mold according to the modified example of the first embodiment.
  • FIG. 8C shows a part of the configuration of the lower mold according to the modified example of the first embodiment, in which the deepest part of the bending of the bolster and the center of the top of the lower mold are misaligned during press molding. It is a front view which is explained by cutting.
  • FIG. 9A is a front view illustrating a configuration in the lower mold according to the modified example of the first embodiment in the case where a stiffening member not connected to the vertical rib is provided.
  • FIG. 9B is a front view illustrating a configuration when the upper portion of the stiffening member is connected to the region of the center height of the vertical rib in the lower mold according to the modified example of the first embodiment.
  • FIG. 9A is a front view illustrating a configuration in the lower mold according to the modified example of the first embodiment in the case where a stiffening member not connected to the vertical rib is provided.
  • FIG. 9B is a front view illustrating a configuration when the upper portion of the stiffening member is connected to the region of
  • FIG. 9C is a front view illustrating a configuration in which two stiffening members support one vertical rib from both sides in the lower mold according to the modified example of the first embodiment.
  • FIG. 9D in the lower mold according to the modified example of the first embodiment, the upper portions of the two stiffening members are connected at the center of the inside of the lower mold, and one vertical rib is formed by two supplements. It is a front view explaining the structure in the case of extending upward from the connection part of a rigid member.
  • FIG. 10A is a front view illustrating a configuration in which a vertical rib is not provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 10B is a front view illustrating another configuration in the case where the vertical rib is not provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 10C is a front view illustrating the configuration of the lower mold according to the modified example of the first embodiment in the case where the stiffening member also serves as the side wall of the lower mold.
  • FIG. 10D is a front view illustrating a configuration when a vertical rib is provided in the lower mold in FIG. 10C.
  • FIG. 11A is a perspective view illustrating a configuration when four stiffening members are provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 11B is a perspective view illustrating a configuration when eight stiffening members are provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 11A is a perspective view illustrating a configuration when four stiffening members are provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 11B is a perspective view illustrating a configuration when eight stiffen
  • FIG. 12A is a perspective view illustrating a configuration in which one side of a rectangular stiffening member intersects the X direction and the Y direction in the lower mold according to the modified example of the first embodiment.
  • FIG. 12B is a perspective view illustrating a configuration when the upper portion of the triangular stiffening member is connected to the region of the upper end of the vertical rib in the lower mold according to the modified example of the first embodiment.
  • FIG. 12C is a perspective view illustrating a configuration when the upper portion of the triangular stiffening member is connected to the region of the central height of the vertical rib in the lower mold according to the modified example of the first embodiment.
  • FIG. 12A is a perspective view illustrating a configuration in which one side of a rectangular stiffening member intersects the X direction and the Y direction in the lower mold according to the modified example of the first embodiment.
  • FIG. 12B is a perspective view illustrating a configuration when the upper portion of the triangular stiffening member is connected to the region of the
  • FIG. 13A is a perspective view illustrating a configuration when a trapezoidal stiffening member is provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 13B is a perspective view illustrating a configuration in the case of another example in which a trapezoidal stiffening member is provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 13C is a perspective view illustrating a configuration in the case of still another example in which a trapezoidal stiffening member is provided in the lower mold according to the modified example of the first embodiment.
  • FIG. 14A is a perspective view illustrating the configuration of a rectangular stiffening member having a hollow portion formed as an example of a lightening process in the lower mold according to the modified example of the first embodiment.
  • FIG. 14A is a perspective view illustrating the configuration of a rectangular stiffening member having a hollow portion formed as an example of a lightening process in the lower mold according to the modified example of the first embodiment.
  • FIG. 14B is a perspective view illustrating the configuration of a triangular stiffening member having a hollow portion formed as an example of a lightening process in the lower mold according to the modified example of the first embodiment.
  • FIG. 14C is a perspective view illustrating the configuration of a stiffening member having a narrowed width, which is an example of a lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 14D is a perspective view illustrating the configuration of another example of the stiffening member having a narrowed width, which is an example of the lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 15A is a perspective view illustrating the configuration of one rod-shaped stiffening member that has been narrowed, which is an example of the lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 15B is a perspective view illustrating the configuration of another example of one rod-shaped stiffening member having a narrowed width, which is an example of a lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 15C is a perspective view illustrating the configuration of two rod-shaped stiffening members that have been narrowed, which is an example of a lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 15A is a perspective view illustrating the configuration of one rod-shaped stiffening member that has been narrowed, which is an example of the lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 15B is a perspective view illustrating the configuration of another example of one rod-shaped stiffening
  • FIG. 15D is a perspective view illustrating the configuration of another example of the two rod-shaped stiffening members that have been narrowed, which is an example of the lightening process, in the lower mold according to the modified example of the first embodiment.
  • FIG. 16 is a cross-sectional view illustrating the configuration of the lower mold according to the modified example of the first embodiment.
  • FIG. 17 is a front view illustrating the configuration of the press molding apparatus according to the second embodiment by cutting a part thereof.
  • FIG. 18 is a front view illustrating the configuration of the press forming apparatus according to the third embodiment by cutting a part thereof.
  • FIG. 19A describes a configuration of a press forming apparatus in which the first mold and the second mold are separated from each other when the first mold and the second mold of the mold are arranged so as to face each other in the horizontal direction. It is a front view.
  • FIG. 19B is a front view illustrating the configuration of the press molding apparatus in a state where the first mold and the second mold of the mold are in close proximity to each other, following FIG. 19A.
  • the press molding apparatus 100 according to the first embodiment will be described with reference to FIGS. 1 to 16.
  • the press forming apparatus 100 according to the first embodiment includes a bed 40, a bolster 50, a die 30, and a slide 60.
  • the bed 40, the bolster 50 and the slide 60 are presses.
  • a cavity 42 that opens to the upper side is provided inside the center of the bed 40.
  • a die cushion pad (not shown) is housed in the cavity 42.
  • the bolster 50 is placed on the cavity 42 of the bed 40.
  • the bed 40 of the present embodiment corresponds to the "support device" of the present disclosure, and supports a mold 30 arranged between the bed 40 and the slide 60.
  • the slide 60 is provided on the upper side of the mold 30.
  • the slide 60 is box-shaped and has a bottom 62, a top 64, and a side wall 65.
  • a cavity is formed inside the slide 60.
  • the structure of the slide 60 is not limited to that exemplified in FIG. 1, and can be appropriately changed.
  • a drive device (not shown) is connected to the slide 60, and the slide 60 can be raised and lowered by the drive device. The slide 60 descends toward the die 30 during press forming and loads the die 30.
  • the cavity 42 of the bed 40 and the cavity of the slide 60 are both “cavities” of the present disclosure. That is, the "cavity" may be partially open or closed by surrounding the entire perimeter. Further, for example, one or more partition walls may be provided inside the slide 60, and cavities may be formed between the partition walls or between the partition walls and the side walls.
  • the mold 30 is arranged on the bolster 50 so as to be overlapped with the cavity 42 of the bed 40.
  • the mold 30 includes a lower mold 10 and an upper mold 20Z.
  • the lower mold 10 of the present embodiment corresponds to the "first type” of the present disclosure
  • the upper mold 20Z of the present embodiment corresponds to the "second type" of the present disclosure.
  • the overall shape of the lower mold 10 and the overall shape of the upper mold 20Z are rectangular parallelepiped, respectively.
  • the overall shape of the lower mold 10 and the overall shape of the upper mold 20Z are not limited to the rectangular parallelepiped shape, and may be any other geometric shape. Further, the overall shape of the lower mold 10 and the overall shape of the upper mold 20Z may be different from each other. Further, in order to assist the fitting of the lower mold 10 and the upper mold 20Z at the time of press molding, a guide portion that fits with each other, such as a convex portion and a concave portion, may be additionally provided.
  • Examples of the material of the lower mold 10 constituting the mold 30 and the material of the upper mold 20Z are FCD600-3 (ISO 600-3) of ductile cast iron in JIS and FC250 (185 in ISO) of gray cast iron in JIS. / JL / 250) steel material can be used. Further, in JIS, SS400 (ISO E275A, E275B, E275C, E275D, R630, Fe42A, 44A) steel material for general structure can be adopted. Further, the carbon steel material S45C (ISO C45) for mechanical structure and the alloy tool steel SKD11 (ISO X210Cr12W12) steel material can be adopted by JIS. However, in the present disclosure, the material of the lower mold and the material of the upper mold constituting the mold are not limited to the steel material, and can be changed as appropriate.
  • a lower insert 70 forming a die face is arranged on the upper surface of the lower mold 10. Further, on the lower surface of the upper die 20Z, the upper insert 80 is arranged in a pair with the lower insert 70.
  • a work material 90 such as a steel plate is sandwiched between the lower insert 70 and the upper insert 80.
  • the material to be processed is not limited to the steel plate, and various other metal materials may be adopted, and the material to be processed other than the metal material may be adopted.
  • the upper mold 20Z has a bottom portion 22, a top portion 24, a side wall 25, and a vertical rib 26.
  • the bottom 22 and the top 24 are connected to each other by a side wall 25 and a vertical rib 26.
  • the bottom portion 22 has a plate shape and is provided on the slide 60 side (upper side in FIG. 1).
  • the top portion 24 has a plate shape and is provided on the bolster 50 side (lower side in FIG. 1) away from the bottom portion 22.
  • the work material 90 is located on the lower side of the top portion 24 in FIG.
  • the side wall 25 has a plate shape, is provided at both ends of the upper die 20Z in the X direction (horizontal direction in FIG. 1), and extends vertically along the Z direction (vertical direction in FIG. 1).
  • the Z direction is the movable direction of the slide 60.
  • the upper end of the side wall 25 and the upper end of the vertical rib 26 are connected to the lower surface of the bottom portion 22 in FIG. 1. Further, the lower end of the side wall 25 and the lower end of the vertical rib 26 are connected to the upper surface of the top 24 in FIG. 1.
  • the vertical ribs 26 of the upper mold 20Z are plate-shaped, and two are provided between the pair of side walls 25 inside the upper mold 20Z, and the vertical ribs 26 are parallel to the Z direction between the bottom and the top. It is extending. In other words, the vertical rib 26 extends perpendicular to the plate surface of the bottom 22 and the plate surface of the top 24, respectively.
  • the thickness or thickness of each of the bottom portion 22, the top portion 24, the side wall 25, and the vertical rib 26 of the upper mold 20Z is, for example, 40 mm to 80 mm. In the present disclosure, the shapes and dimensions of the bottom, top, side walls and vertical ribs of the upper mold can be changed as appropriate.
  • the lower mold 10 has a bottom portion 12, a top portion 14, a side wall 15, a vertical rib 16, and a stiffening member 18.
  • the bottom portion 12 and the top portion 14 are connected to each other by a side wall 15, a vertical rib 16, and a stiffening member 18.
  • the bottom portion 12 has a plate shape and is provided on the bolster 50 side (lower side in FIG. 1).
  • the top portion 14 has a plate shape and is provided on the slide 60 side (upper side in FIG. 1) away from the bottom portion 12, and the work material 90 is placed on the upper side of the lower mold 10.
  • the side wall 15 has a plate shape, is provided at both ends of the lower mold 10 in the X direction (left-right direction in FIG.
  • the vertical ribs 16 of the lower mold 10 are plate-shaped, and two are provided between the pair of side walls 15 inside the lower mold 10 and vertically between the bottom and the top in parallel with the movable direction of the slide 60. Extends to.
  • the vertical ribs 16 extend perpendicular to the plate surface of the bottom 12 and the plate surface of the top 14, respectively.
  • the vertical rib 16 of the lower mold 10 is provided at a position overlapping with the vertical rib 26 of the upper mold 20Z in the vertical direction.
  • the thickness or thickness of each of the bottom portion 12, the top portion 14, the side wall 15 and the vertical rib 16 of the lower mold 10 is, for example, 40 mm to 80 mm. In the present disclosure, the shapes and dimensions of the bottom, top, side walls and vertical ribs of the lower mold can be changed as appropriate.
  • the stiffening members 18 have a plate shape and are arranged in pairs with the center of the top portion 14 interposed therebetween.
  • the shape and the number of the stiffening members 18 can be arbitrarily set.
  • the stiffening member 18 is not limited to a plate shape, but may be a rod shape.
  • the thickness or thickness of the stiffening member 18 is, for example, 1 ⁇ 2 of the thickness or thickness of each of the bottom portion 12, the top portion 14, the side wall surface 15, and the vertical rib 16 of the lower mold 10, or It can be set as appropriate, such as double.
  • the stiffening member 18 When the stiffening member 18 has a plate shape, the plate shape may be, for example, a flat surface as long as the required strength is secured, or may be a shape provided with irregularities or steps. good. Further, the stiffening member 18 may be subjected to a lightening process such as forming a hollow or narrowing the width.
  • the rod shape When the stiffening member has a rod shape, the rod shape may be, for example, linear as long as the required strength is secured, or may have a shape provided with a bend or a step. .. Further, it may be rod-shaped or may have a hollow or the like formed in the stiffening member.
  • the shape of the stiffening member that has been lightened will be described later with reference to FIG.
  • the shape of the rod-shaped stiffening member will be described later with reference to FIG.
  • stiffening member 18 One end of the stiffening member 18 is directly connected to the bottom portion 12, and the other end is connected to the top portion 14.
  • the other end of the upper side of the stiffening member 18 illustrated in FIG. 1 is directly connected to the top portion 14, but the present disclosure is not limited to this. Even if the stiffening member 18 is indirectly connected to the top portion 14 via the vertical rib 16 by connecting the other end of the stiffening member 18 to the center of the vertical rib 16 in the vertical direction in FIG. good.
  • the stiffening member 18 extends inclined from the connection portion with the bottom portion 12 toward the side where the center of the top portion 14 is located, from the bottom portion 12 side to the top portion 14 side. That is, the shortest distance from the deepest portion C1 (see FIG. 6), which is the center of the top portion 14, to the connection portion between the top portion 14 and the stiffening member 18 in a plan view along the Z direction is the bottom portion 12 and the supplementary portion. It is shorter than the shortest distance between the rigid member 18 and the connecting portion.
  • the stiffening member 18 is arranged at the position of the diagonal line of the rectangle formed by the bottom portion 12, the vertical ribs 16, and the top portion 14. That is, a truss structure is formed on the lower mold 10 by the bottom portion 12, the vertical ribs 16, and the stiffening member 18.
  • the stiffening member does not necessarily have to be arranged at a diagonal position, and the arrangement position can be arbitrarily set.
  • the stiffening member 18 is provided on the lower mold 10, but in the present disclosure, the stiffening member may be provided on at least one of the lower mold and the upper mold, or , May be provided on both the lower mold and the upper mold.
  • the mold in which the stiffening member is provided only in the upper mold will be described in the second embodiment, and the mold in which the stiffening member is provided in both the lower mold and the upper mold will be described in the third embodiment. explain.
  • the lower mold 10 according to the first embodiment can be integrally manufactured by, for example, casting.
  • the lower mold according to the present disclosure may be manufactured by manufacturing the stiffening member 18 separately from the main body of the lower mold and attaching it to an existing lower mold to which the stiffening member is not provided by welding or the like. can.
  • the upper mold 20Z having the upper insert 80 mounted on the top 24 is the slide 60. It is provided at the bottom. Further, a lower mold 10 having a lower insert 90 mounted on the top portion 14 is provided on the bolster 50. The work material 90 is arranged at a predetermined position on the lower insert 90 on the lower mold 10 side.
  • the upper insert 80 comes into contact with the workpiece 90 and the lower insert 90.
  • the workpiece 90 is formed into a desired shape according to the shape of the die face of the die 30.
  • the bed 40 and the bolster 50 to which the load is applied from the upper side through the mold 30 are such that the center of the bed 40 and the bolster 50 project downward due to the influence of the cavity 42 at the bottom dead center of molding. Elastically deforms.
  • the upper mold 20Z separates from the lower mold 10 due to the ascent of the slide 60.
  • the lower mold 10 is arranged on the bolster 50 so as to be overlapped with the cavity 42 of the bed 40. Therefore, by elastically deforming the center of the top portion 14 so as to project downward, a bowl-shaped deflection is formed on the top portion 14 of the lower mold 10 as in the bolster 50.
  • the amount of deflection D1 of the top 14 of the lower mold 10 of the first embodiment is between the deepest part C1 of the bending of the top 14 in the Z direction and the highest position at the outer end of the top 14. It is exemplified as the height difference of.
  • the deepest part B of the bending of the curved bolster 50 and the deepest part C1 of the bending of the top 14 of the lower mold 10 overlap each other in the vertical direction (Z direction). ..
  • the load transmitted from the bolster 50 to the lower mold 10 by the bowl-shaped deflection is as much as the load in the region of the bottom 12 of the lower mold 10 which is separated from the deepest portion B of the deflection of the bolster 50 to the inside. It will be larger than that.
  • the difference in the magnitude of each load is exemplified by the length of the white arrow.
  • the load transmitted from the region distant from the deepest portion B of the bolster 50 to the bottom portion 12 is carried by the stiffening member 18 inclined from the outside toward the side where the central side is located, so that the load is transferred to the top portion 14. Guided towards the center. That is, the load from the bolster 50 transmitted from the region distant from the center of the bottom 12 is distributed without being concentrated on both ends of the top 14.
  • the case where the upper mold 20Z bends at the same time as the lower mold 10 during press molding is exemplified.
  • the center of the slide 60 may protrude upward and bend due to a load during press molding. Similar to the relationship between the bolster 50 and the lower mold 10, the difference between the magnitude of the load transmitted from the center of the slide 60 to the upper mold 20Z and the magnitude of the load transmitted from the outside to the upper mold 20Z is caused.
  • the upper mold 20Z can bend.
  • FIG. 2 illustrates a state in which the upper surface of the lower insert 70 is in contact with the lower surface of the work material 90 and the left and right ends of the upper insert 80 are in contact with the work material 90. Further, in FIG. 2, in the center in the left-right direction, almost no gap is formed between the upper surface of the lower insert 70 and the lower surface of the work material 90, and the lower surface of the upper insert 80 and the work material 90 are formed. A state in which a gap is formed between the surface and the upper surface is exemplified. Therefore, in the present embodiment, the maximum gap G is substantially configured by the length between the lower surface of the upper insert 80 and the upper surface of the work piece 90.
  • the maximum gap is not limited to this, and is appropriately formed according to the specifications of the press forming apparatus and the press conditions.
  • the maximum gap is also formed by the sum of the maximum length between the lower surface of the upper insert and the upper surface of the work piece and the maximum length between the upper surface of the lower insert and the lower surface of the work material. obtain.
  • the maximum gap can also be formed solely by the maximum length between the top surface of the lower insert and the bottom surface of the work piece.
  • FIG. 4 illustrates a press molding apparatus 100Z according to a comparative example, which is provided with a lower mold 10Z provided with only vertical ribs 16 without providing a stiffening member 18.
  • the amount of deflection D2 of the top portion 14 of the comparative example is the height difference between the deepest portion C2 of the deflection of the top portion 14 and the highest position at the outer end portion of the top portion 14 in the Z direction in FIG.
  • the load transmitted from the bolster 50 transmitted from the region distant from the center of the bottom 12 is guided to both ends of the top 14 by the side walls 15 at both ends. Further, the load transmitted from the bolster 50 to the center side of the bottom portion 12 is transmitted to the center of the top portion 14 via the two vertical ribs 16 provided between the top portion 14 and the bottom portion 12.
  • the load transmitted from the bolster 50 transmitted from the region distant from the center of the bottom 12 is concentrated on both ends of the top 14, as compared with the first embodiment. Therefore, the bending moment acting on the top portion 14 is larger than that of the first embodiment, and the bending amount D2 of the top portion 14 of the lower mold 10Z of the comparative example is the bending amount of the top portion 14 of the lower mold 10 of the first embodiment. It is larger than D1. In other words, in the lower mold 10Z according to the comparative example, the load transmitted from the region distant from the deepest portion B of the bolster 50 cannot be sufficiently supported on the central side.
  • the lower insert 70 and the upper insert 80 are covered only at both ends in the left-right direction. Contact with the processed material 90. Further, in the press molding apparatus 100Z in FIG. 4, in the center in the left-right direction, between the lower insert 70 and the work material 90, unlike the lower mold 10 of the first embodiment shown in FIG. 2, it is large. A gap is formed. In the press forming apparatus 100Z according to the comparative example, the maximum gap is the maximum length in the vertical direction between the lower surface of the upper insert 80 and the upper surface of the work material 90, and the upper surface of the lower insert 70 and the lower surface of the work material 90. It is formed by the sum of the maximum length in the vertical direction between and.
  • each component of the mold model of the lower mold 10 in FIG. 6 is designated by the same reference numeral as the corresponding component in the actual lower mold 10 in FIG.
  • the dimensions of the mold model of the lower mold 10 were X direction: about 1240 mm, Y direction: about 610 mm, and Z direction: about 422 mm. Further, by providing the two stiffening members 18, two truss structures were formed. Further, the amount of deflection D1 is along the Z direction between the deepest portion C1 of the top portion 14 and the virtual position E of the end portion of the rectangle of the top portion 14 in the longitudinal direction (X direction in FIG. 6) in a plan view. It is the measured height difference. Further, the deepest portion C1 and the virtual position E are located on a straight line parallel to the X direction in a plan view.
  • the present inventors have created a mold model of the lower mold 10 according to a comparative example for analysis, which does not have the stiffening member 18, similar to the mold model of the lower mold 10 according to the present embodiment. .. Then, the amount of deflection D1 of the lower apex 14 of the example and the amount of deflection D2 of the lower apex 14 of the comparative example were calculated.
  • the molding load was 350 tons in each case.
  • the bending amount D1 of the deepest part of the top 14 of the lower mold 10 of the example was 28 ⁇ m.
  • the amount of deflection D2 at the deepest part of the top 14 of the lower mold of the comparative example was 54 ⁇ m. That is, when the bending amount D2 of the comparative example was set to 100%, the bending amount D1 of the example could be suppressed to about 50% of the comparative example.
  • the values disclosed in the above examples are examples, and the amount of deflection is not limited to this in the present disclosure.
  • the amount of deflection can vary depending on molding conditions such as the press, die face, die structure and load.
  • the calculated difference in the amount of deflection is a value on the order of microns, but a difference in the amount of deflection of 1 mm or more may occur depending on the conditions.
  • the present inventors calculated the maximum gap G formed between the upper mold 20Z and the lower mold 10 in each of the examples and the comparative examples. As a result of the calculation, in the example, the maximum gap G could be reduced by several tens of microns as compared with the case of the comparative example. As in the case of the amount of deflection, the value of the maximum gap G is not limited to the value of the above embodiment. In the present disclosure, the maximum gap G may change depending on the molding conditions, for example, about several tens of ⁇ m to several mm.
  • the lower mold 10 has a stiffening member 18 having one end directly connected to the bottom portion 12 and the other end connected to the top portion 14, and the stiffening member 18 is from the bottom portion 12 side to the top portion 14 side. From the connection portion with the bottom portion 12, the center of the top portion 14 extends toward the side where the center is located.
  • the load transmitted from the bolster 50 to the lower mold 10 is transferred by the stiffening member 18 inside the lower mold 10. It is guided to the center side of the plate-shaped top 14.
  • One end of the stiffening member 18 is directly connected to the bottom portion 12 and the other end is connected to the top portion 14. Therefore, the load induced by the stiffening member 18 is efficiently utilized as a force against the deflection at the center of the top portion 14. In other words, the load transmitted from the bolster 50 biased outward at the bottom 12 of the lower mold 10 is distributed by the stiffening member 18 so that the bias between the center and the outside is suppressed at the top 14.
  • the rigidity of the top 14 of the lower mold 10 is reinforced as compared with the lower mold in which only the vertical vertical ribs 16 extending in parallel along the movable direction of the slide 60 are provided between the top 14 and the bottom 12. Therefore, it is possible to suppress the bending of the top 14 of the lower mold 10 on the work piece side.
  • the stiffening member 18 As an improvement of the die, it is only necessary to provide the stiffening member 18 on the lower die 10, and even if the press machine bends, it is not necessary to improve the configuration on the press machine side. Further, since it is only necessary to provide the stiffening member 18 as the improvement work of the lower mold 10, the improvement work is relatively simple.
  • the first embodiment it is not necessary to improve the configuration on the press machine side, and by directly and relatively easily improving the lower mold 10 itself, the bending of the upper surface of the lower mold 10 can be suppressed.
  • the stiffening member 18 supports the die face, and the load can be appropriately transmitted to the die face. Therefore, even if the bolster 50 is bent, the deformation of the die face can be reduced, so that the burden of developing the mold is reduced.
  • the bending amount D2 of the comparative example when the bending amount D2 of the comparative example is assumed to be 100%, the bending amount D1 of the example can be suppressed to about 50% of the comparative example. .. Therefore, assuming that the difference between the comparative example and the rigid die model is 100% with respect to the amount of springback generated in the product press-molded using the die 30 in the press forming simulation, the example and the rigid die model The difference between the two is suppressed to 50%. That is, according to the first embodiment, the prediction accuracy of the numerical analysis is improved. Therefore, the discrepancy between the mold of the actual machine and the mold model for analysis is suppressed, and the reproducibility of the simulation can be improved.
  • the pair of stiffening members 18 are arranged so as to sandwich the center of the top portion 14, the load is applied not only from one side but also from both sides to the center of the top portion 14 during press molding. Be guided. Therefore, the deflection of the top portion 14 can be suppressed in a well-balanced manner while reducing the bias.
  • the truss structure is formed by the vertical rib 16, the bottom portion 12, and the stiffening member 18, the rigidity of the lower mold 10 can be further improved.
  • the mold 30 provided with the lower mold 10 having the stiffening member 18 since the mold 30 provided with the lower mold 10 having the stiffening member 18 is used, the bending of the lower mold 10 can be effectively suppressed, and as a result, the bending of the lower mold 10 can be effectively suppressed.
  • the formability and dimensional accuracy of the molded product can be improved.
  • the stiffening member 18 connected to the bottom portion 12 and the top portion 14 is integrally formed with the bottom portion 12 and the top portion 14.
  • the lower mold 10 can be efficiently manufactured. Further, the existing equipment is obtained by fixing the stiffening member 18 formed separately from the bottom portion 12 and the top portion 14 to an existing lower mold having no stiffening member by welding or the like. It can be effectively used without discarding the lower mold.
  • the lower mold of the present disclosure may be configured by adding a separate stiffening member 18 to the lower mold 10 on which the stiffening member 18 is already formed.
  • the stiffening member 18 may be provided only on one of the left and right sides of the center of the lower mold 10A. Further, in FIG. 8B, two pairs of stiffening members 18 sandwiching the center of the lower mold 10B are exemplified. That is, in the present disclosure, a plurality of stiffening members 18 may be provided, or a plurality of stiffening members 18 may be provided in a non-paired state. Further, as shown in FIG. 8C, at the time of press molding, the deepest portion B of the bending of the bolster 50 and the center C3 of the top of the lower mold 10C may be arranged so as to be offset from each other.
  • the deepest part B of the deflection of the bolster 50 and the center C3 of the top of the lower mold 10C do not have to be arranged coaxially.
  • the bolster 50 is drawn in a cut state for ease of viewing.
  • the second stiffening member 18 from the left side faces the outside of the center C3 of the top from the connection portion with the bottom from the lower bottom toward the upper top. It is tilted and extended. Therefore, the stiffening member 18 second from the left side in FIG. 8C does not appear to be inclined and extended toward the side where the center is located only in the front view.
  • some stiffeners are directed from the bottom to the top, from the connection with the bottom to the side where the center of the top is located. It suffices if it is tilted and extended. It suffices that the load during press molding can be guided from the bottom to the center of the top as a whole by the plurality of stiffening members.
  • the three stiffening members 18 including the two on the right side and the one on the left end are all from the lower bottom to the upper side. Towards the top of the top, it extends from the connection with the bottom, sloping toward the side where the center of the top is located. Therefore, even if the lower die 10C in FIG. 8C has one stiffening member 18 second from the left side that is inclined and does not extend toward the side where the center of the top is located, four compensators are used. As the rigid member 18 as a whole, the load at the time of press molding can be guided from the bottom to the center side of the top. Therefore, the lower mold 10C in FIG. 8C corresponds to the lower mold of the present disclosure.
  • the stiffening member 18 does not have to be connected to a part or all of the vertical ribs 16 provided in the lower mold 10D.
  • FIG. 9A illustrates a stiffening member 18 that is not connected to all the two vertical ribs 16 provided on the lower die 10D. The stiffening member 18 only needs to be able to guide the load from the bolster 50 side to the center of the top 14.
  • the upper portion of the stiffening member 18 is connected to the region of the center height of the vertically extending vertical rib 16 so that the stiffening member 18 supports the vertical rib 16. May be done. That is, the formation of the truss structure is not essential.
  • one vertical rib 16 is provided in the center in the left-right direction, and the upper portion of each of the two stiffening members 18 is the center height of the vertical rib 16.
  • Two stiffening members 18 may support one vertical rib 16 from both sides.
  • the stiffening member 18 is connected to the top 14 via the vertical rib 16.
  • the stiffening member 18 extending from the lower left corner portion toward the upper right is the vertical rib. It may extend beyond the position of 16 and further continuously within the region to the right of the vertical rib 16.
  • the upper portions of the two stiffening members 18 may be connected at the center in the left-right direction and the center in the up-down direction of the lower mold 10G.
  • one vertical rib 16 may be provided so as to extend upward from the connecting portion of the two stiffening members 18.
  • the two stiffening members 18 support the upper vertical rib 16 from below and are connected to the top 14 via the vertical rib 16.
  • the vertical rib 16 in FIG. 9D is an auxiliary vertical rib in which the lower portion is not connected to the bottom, unlike the vertical rib 16 exemplified in FIGS. 9A to 9C.
  • the lower mold 10H may be provided with only the stiffening member 18 inside without providing the vertical rib 16.
  • the upper portions of the two stiffening members 18 are connected to each other in close proximity to the top 14 at the center in the left-right direction of the lower mold 10I in a state where the vertical ribs 16 are not provided. May be good.
  • the lower mold 10J does not have to be provided with a side wall as a member separate from the stiffening member 18.
  • the stiffening member 18 forms the left and right outer edges, so that the entire outer edge is trapezoidal.
  • the vertical rib 16 may be provided inside the lower mold 10K having a trapezoidal shape on the entire outer edge.
  • the vertical rib 16 is not essential in the present disclosure because it does not have the function of guiding the outer load to the center like the stiffening member 18.
  • the vertical rib is arranged in the center of the mold, it is possible to secure a certain degree of function of effectively transmitting the load transmitted from the bolster 50 to the top in the load range where the molding load is relatively low. Is. Therefore, in the low load region, it is preferable to provide the vertical rib 16 and the stiffening member 18 in combination because the function of the stiffening member 18 can be assisted.
  • the shape of the stiffening member 18 according to the modified example exemplified in FIGS. 1 to 10 was drawn as a two-dimensional (planar) shape, but the stiffening member 18 according to the present disclosure is shown in FIGS. 11 to 11. As shown in FIG. 15, it actually exists in a direction (Y direction) orthogonal to a plane (ZX plane). That is, the stiffening member 18 is three-dimensionally arranged inside the lower mold 10. In FIGS. 11 to 15, for the sake of clarity, the top of the lower mold is not shown, and only the outline of the stiffening member 18 is a solid line, and only the outline of the bottom and the vertical rib is shown. Each is illustrated by a broken line.
  • the lower mold 10L in FIG. 11A has four vertical ribs. Nine compartments are formed inside the lower mold 10L by providing two vertical ribs along the X direction and two along the Y direction with a space between them. ing. As shown in FIG. 11A, in the present disclosure, a plurality of stiffening members 18 may be provided so as to surround the center of the top portion 14. In the lower mold 10L in FIG. 11A, four plate-shaped stiffening members 18 are arranged so as to surround the center of the top. Further, the four stiffening members 18 are arranged so as to form a rotational symmetry of 90 degrees in a plan view of the XY plane from the Z direction. Each stiffening member 18 extends from the upper surface of the bottom portion 12 along the XY plane toward the center of the bottom portion 12 along the Z direction.
  • the lower mold 10M in FIG. 11B has 16 vertical ribs. Inside the lower mold 10M, 16 vertical ribs are provided, 4 along the X direction and 4 along the Y direction, so as to be spaced apart from each other, thereby forming 25 sections. ing.
  • the lower mold 10M has a rectangular shape in a plan view, and the eight stiffening members 18 are two in a state where 90-degree rotational symmetry is formed in each of the outer compartments corresponding to the four sides of the rectangle. They are arranged one by one.
  • the stiffening member 18 is arranged in two sections sandwiched between both ends and the center among the five sections in which the lower mold 10M is viewed from the front or the side surface.
  • the angle of rotational symmetry of the stiffening member 18 is not limited to 90 degrees and can be changed as appropriate. Further, in the present disclosure, the rotationally symmetric arrangement of the stiffening member 18 is not essential.
  • the stiffening member 18 of the lower mold 10M exemplified in FIG. 11B does not necessarily extend toward the center of the apex itself.
  • the stiffening member 18 extends from the connection portion with the bottom toward the side where the center of the top is located. There is. Further, in a plan view, the shortest distance from the center of the top to the connecting portion between the top and the stiffening member 18 is shorter than the shortest distance between the bottom and the connecting portion between the stiffening member 18.
  • the plate-shaped stiffening member 18 in FIGS. 11A and 11B has a rectangular shape, and one side of the rectangle connected to the bottom and one side of the rectangle connected to the top are parallel to the X direction or the Y direction. It was extended to. However, as in the stiffening member 18 of the lower mold 10N exemplified in FIG. 12A, in the present disclosure, one side of the rectangle of the stiffening member 18 may intersect the X direction and the Y direction.
  • the shape of the stiffening member may be triangular instead of rectangular, as in the stiffening member 18 of the lower mold 10P exemplified in FIG. 12B.
  • the upper portion of the triangular stiffening member 18 is connected to the region of the central height of the vertical rib 16 and is connected via the vertical rib 16. It may be connected to the top 14.
  • FIGS. 12 and 13 are both rectangular in a plan view, and the central axis L is exemplified in each drawing for convenience of explanation.
  • the central axis L can be set as a virtual line extending in the Z direction (vertical direction) through the center of gravity of the lower mold when the lower mold is placed on a horizontal plane.
  • the shape of the stiffening member may be trapezoidal as in the stiffening member 18 of the lower mold 10R exemplified in FIG. 13 (A). Further, as shown in FIG. 13B, both ends of the lower bottom portion of the trapezoidal stiffening member 18 may stay inward without extending to the outer edge of the lower mold 10S. Further, as in the stiffening member 18 of the lower mold 10T exemplified in FIG. 13C, both ends of the upper bottom portion of the trapezoidal stiffening member 18 are close to each other at the center height of the vertical rib 16.
  • the stiffening member 18 may be connected to the apex 14 via a vertical rib 16.
  • the stiffening member 18 that has been lightened is exemplified.
  • a rectangular hole is formed as a hollow portion by a lightening process.
  • the stiffening member 18 in FIG. 14A has a frame shape, and the outer edge of the stiffening member 18 has a rectangular shape.
  • a triangular hole is formed as a hollow portion by a lightening process.
  • the stiffening member 18 in FIG. 14B has a frame shape, and the outer edge of the stiffening member 18 has a triangular shape.
  • the corner portion of the hole in the hollow portion is not sharp and has a rounded shape in consideration of the durability of the stiffening member.
  • the width of one lower end of the rectangular stiffening member 18 in FIG. 14C is narrowed to about half the width of the bottom in the left-right direction by the lightening process. Further, the width of the other end of the upper end of the rectangular stiffening member 18 in FIG. 14C is narrowed to about half of the width in the left-right direction of the top portion by the lightening process.
  • the narrowed rectangular stiffening member 18 in FIG. 14C is arranged in a state where the right end of the stiffening member 18 is aligned with the right end of the bottom and the right end of the top.
  • the width of one lower end of the rectangular stiffening member 18 in FIG. 14D is narrowed to about half the width of the bottom in the left-right direction by the lightening process. Further, the width of the other end of the upper end of the rectangular stiffening member 18 in FIG. 14D is narrowed to about half of the width in the left-right direction of the top portion by the lightening process.
  • the narrowed rectangular stiffening member 18 in FIG. 14D is arranged in a state where the left end of the stiffening member 18 is aligned with the left end of the bottom and the left end of the top.
  • a rod-shaped stiffening member 18 is exemplified.
  • the "rod-shaped stiffening member” may include a narrowed plate-shaped stiffening member. That is, the narrowed plate-shaped stiffening member may be expressed as "rod-shaped”.
  • the lower end of the rod-shaped stiffening member 18 is connected to the center of the bottom in the left-right direction, and the upper other end of the rod-shaped stiffening member 18 is in the left-right direction of the top. It is connected to the center of. Further, as shown in FIG. 15B, the lower end of the rod-shaped stiffening member 18 is connected to the left end of the bottom, and the upper other end of the rod-shaped stiffening member 18 is connected to the right end of the top. Has been done.
  • two rod-shaped stiffening members 18 may be provided in parallel.
  • the lower end of the rod-shaped stiffening member 18 on the right side is connected to the center of the bottom in the left-right direction, and the upper other end of the rod-shaped stiffening member 18 on the right side is the top. It is connected to the center in the left-right direction.
  • the lower end of the rod-shaped stiffening member 18 on the left side is connected to the left end of the bottom, and the upper other end of the rod-shaped stiffening member 18 on the left side is the left end of the top. It is connected to the.
  • two rod-shaped stiffening members 18 may be provided so as to intersect each other.
  • the lower end of the rod-shaped stiffening member 18 on the right side is connected to the right end of the bottom, and the upper other end of the rod-shaped stiffening member 18 on the right side is connected to the right end of the top.
  • the lower end of the rod-shaped stiffening member 18 on the left side is connected to the left end of the bottom, and the upper other end of the rod-shaped stiffening member 18 on the left side is rod-shaped on the right side. It is connected to the left side of the top in a state of being in contact with the other end of the upper side of the stiffening member 18.
  • connection portion with the bottom portion 12 which is the base of the stiffening member 18 may be widened from the central region of the stiffening member 18.
  • the width W2 of the connecting portion of the stiffening member 18 with the bottom 12 is wider than the width W1 of the central region of the stiffening member 18. Therefore, the rigidity of the lower mold 10U can be further improved.
  • connection portion with the top portion 14 on the upper side of the stiffening member 18 may be widened from the central region of the stiffening member 18.
  • the width W3 of the connecting portion of the stiffening member 18 with the top 14 is wider than the width W1 of the central region of the stiffening member 18. Therefore, the rigidity of the lower mold 10U can be further improved as compared with the case where only the connection portion of the stiffening member 18 with the bottom portion 12 is widened from the central region of the stiffening member 18.
  • the width W1 of the central region of the stiffening member 18, the width W2 of the connecting portion with the bottom portion 12, and the width W3 of the connecting portion with the top portion 14 are the thickness of the stiffening member 18 in cross-sectional view or front view. It is the width measured along the direction. Further, in the stiffening member 18 in FIG. 16, a case where both the connection portion with the bottom portion 12 and the connection portion with the top portion 14 are widened is exemplified, but the present disclosure is not limited to this, and any of them is used. Only one may be widened. Further, the width W2 of the connecting portion of the stiffening member 18 with the bottom portion 12 and the width W3 of the connecting portion of the stiffening member 18 with the top portion 14 may be the same or different from each other. It can be set arbitrarily.
  • the press molding apparatus 100A according to the second embodiment includes a bed 40, a bolster 50, a mold 30, and a slide 60, and the mold 30 is similar to the press forming apparatus 100 shown in FIG.
  • the point that the lower mold 10Z and the upper mold 20 are included is the same.
  • the lower mold 10Z of the mold 30 is not provided with the stiffening member 18, and the upper mold 20 is provided with the stiffening member 28, which is different from the first embodiment. ..
  • a pair of stiffening members 28 are arranged on the upper mold 20 with the center of the top portion 24 interposed therebetween.
  • Each of the stiffening members 28 moves from the upper bottom 22 side to the lower top 24 side in the Z direction from the connection portion with the bottom 22 to the side where the center of the top 24 in the left-right direction (X direction) is located. It extends toward.
  • the stiffening member 28 forms a truss structure inside the upper die 20.
  • the upper mold 20 according to the second embodiment can be manufactured by casting, for example, like the lower mold 10 according to the first embodiment. Further, the upper mold 20 can be manufactured by manufacturing the stiffening member 28 separately from the main body of the upper mold and attaching the stiffening member 28 to the existing upper mold to which the stiffening member is not provided by welding or the like. Since the configuration of other members of the press molding apparatus 100A according to the second embodiment is the same as the configuration of the member having the same name in the press molding apparatus 100 according to the first embodiment, duplicate description will be omitted. Further, the press molding method using the press molding apparatus 100A according to the second embodiment is the same as the press molding method using the press molding apparatus 100 according to the first embodiment, and therefore duplicate description will be omitted. ..
  • the load transmitted from the slide 60 to the upper mold 20 during press molding is guided to the center side of the plate-shaped top 24 by the stiffening member 28. ..
  • the induced load is efficiently utilized as a force against the deflection at the center of the top 24.
  • the rigidity of the top portion 24 is reinforced as compared with the upper mold provided with only the vertical vertical ribs 26, so that the workpiece side of the upper mold 20 is to be processed. The deflection of the top 24 of the top 24 can be suppressed.
  • the stiffening member 28 on the upper die 20 as an improvement of the die, and even if the press machine bends, the configuration on the press machine side can be changed. No need to improve. Further, since it is only necessary to provide the stiffening member 28 as the improvement work of the upper mold 20, the improvement work is relatively simple.
  • the second embodiment it is not necessary to improve the configuration on the press machine side, and by directly and relatively easily improving the upper die 20 itself, the lower surface of the upper die 20 on the workpiece side is bent. Can be suppressed.
  • the other functions and effects of the upper mold 20 of the press molding apparatus 100A according to the second embodiment are the same as those of the lower mold 10 according to the first embodiment.
  • the press molding apparatus 100B according to the third embodiment includes a bed 40, a bolster 50, a mold 30, and a slide 60, and the mold 30 is similar to the press forming apparatus 100 shown in FIG.
  • the point that the lower mold 10 and the upper mold 20 are included is the same.
  • the first embodiment is that both the lower mold 10 and the upper mold 20 are provided with the stiffening member by providing the stiffening member 28 on the upper mold 20 of the mold 30. Different from.
  • the upper mold 20 according to the third embodiment can be manufactured by casting, for example, like the upper mold 20 according to the second embodiment. Further, the upper mold 20 can be manufactured by manufacturing the stiffening member 28 separately from the main body of the upper mold and attaching the stiffening member 28 to the existing upper mold to which the stiffening member is not provided by welding or the like.
  • the stiffening member 18 reinforces the rigidity of the top 14 of the lower mold 10
  • the stiffening member 28 reinforces the rigidity of the top 24 of the upper mold 20. Therefore, according to the third embodiment, it is not necessary to improve the configuration on the press machine side, and by directly and relatively easily improving the lower mold 10 and the upper mold 20 itself, the work material side of the lower mold 10 can be improved. It is possible to suppress both the bending of the upper surface of the upper die and the bending of the lower surface of the upper die 20 on the work piece side.
  • Other operational effects of the press molding apparatus 100B according to the third embodiment are the same as those of the first embodiment and the second embodiment.
  • the names of the bed 40, the bolster 50, and the slide 60 which are the press machines used in the description in the present embodiment, are examples, and in the present disclosure, any member having substantially the same function can be used.
  • the name is not limited. Further, it is not hindered to add an apparatus or equipment for press molding which is not disclosed in the specification.
  • a press forming apparatus 100 in which the lower die 10 as the first die and the upper die 20Z as the second die are arranged so as to face each other in the vertical direction is exemplified.
  • the present disclosure is not limited to the state of the first type and the second type facing each other.
  • the first type and the second type may be horizontally opposed to each other, or the virtual lines connecting the centers of the tops of each other may be opposed to each other so as to be inclined with respect to the horizontal direction. good.
  • FIG. 19A exemplifies a press forming apparatus 100C in which the first mold 10X and the second mold 20X of the mold 30X are arranged so as to face each other in the horizontal direction.
  • the press molding apparatus 100C includes a box-shaped support device 40A mounted on the floor surface F, and a first mold 10X is mounted on the wall surface of the left wall of the support device 40A. The bottom portion 12 is supported so as to be located on the support device 40A side.
  • the die 30X is arranged between the support device 40A and the slide 60 as in the case of the first to third embodiments. Further, although not shown, the inside of the support device 40A is hollow.
  • a slide 60 is provided on the upper side of the support device 40A in FIG. 19A, and a first cam member 102 extending downward is attached to the lower surface of the slide 60.
  • the second cam member 104 is supported by a support member (not shown) so as to be movable in the horizontal direction in the air.
  • a second mold 20X is supported so that the bottom portion 22 is located on the second cam member 104 side.
  • the state of the facing arrangement of the first mold and the second mold is not limited to the one in which the first mold and the second mold are opposed to each other in the vertical direction, and can be arbitrarily set.
  • the upper insert 70, the lower insert 80, and the material 90 are not shown for convenience of explanation.
  • the structure of the mold 30X in FIG. 19A is the same as the structure of the mold 30 in FIG. 1 except for the arrangement state of the first mold 10X and the second mold 20X.
  • the first cam member 102 is provided with a sliding surface 102A inclined at about 45 degrees with respect to a horizontal plane at the lower portion, and the second cam member 104 has substantially the same inclination angle as the sliding surface 102A of the first cam member 102.
  • a sliding surface 104A having a sliding surface 104A is provided on the upper part. The tilt angle is not limited to 45 degrees and can be changed as appropriate.
  • the sliding surface 102A of the first cam member 102 and the sliding surface 104A of the second cam member 104 are in contact with each other.
  • the first cam member 102 descends together with the slide 60. Further, the sliding surface 102A of the first cam member 102 and the sliding surface 104A of the second cam member 104 are smooth to each other, and as shown in FIG. 19B, when the first cam member 102 descends, the second cam The member 104 moves horizontally to the right in conjunction with each other. That is, the cam structure is formed by the first cam member 102 and the second cam member 104. Due to the horizontal movement of the second cam member 104, the second mold 20X is pressed against the first mold 10X, and the work material sandwiched between the first mold 10X and the second mold 20X is a predetermined material. Press-molded into a shape.
  • the first mold (lower mold) and the second mold (upper mold) are arranged to face each other in the vertical direction, and as in the case of the first to third embodiments in which the bolster 50 is used, the press load is applied.
  • the side wall of the support device 40A on which the first mold 10X is supported bends. Therefore, although not shown, even in the press molding apparatus 100C, the top portion 14 of the first mold 10X can be bent so that the center protrudes to the right side in FIG. 19B. Further, the top 24 of the second mold 20X can be bent so that the center protrudes to the left side in FIG. 19B.
  • the bending of the top portions 14 and 24 can be suppressed by providing the stiffening members 18 and 28 in the first mold 10X or the second mold 20X. ..
  • the mold and the press forming apparatus can be configured by partially combining the configurations shown in FIGS. 1 to 19.
  • the root portion may be plate-shaped, and the portion on the work piece side may be composed of one or more rod-shaped portions.
  • the present disclosure includes various embodiments not described above, and the technical scope of the present disclosure is defined only by the matters specifying the invention within the scope of claims reasonable from the above description.
  • the first aspect is A mold comprising a first mold and a second mold, wherein at least one of the first mold and the second mold is With a plate-shaped bottom, A plate-shaped top provided apart from the bottom and One end is directly connected to the bottom, the other end is connected to the top, and the stiffening extends from the connection portion with the bottom toward the side where the center of the top is located from the bottom side toward the top side.
  • Aspect 2 is The stiffening member is provided only in the first mold.
  • the mold according to the first aspect is The stiffening member.
  • Aspect 3 is The stiffening member is provided only in the second mold.
  • the mold according to the first aspect is The stiffening member.
  • Aspect 4 is The stiffening member is provided in both the first mold and the second mold.
  • Aspect 5 is A pair of the stiffening members are arranged so as to sandwich the center of the top.
  • the mold according to any one of aspects 1 to 4.
  • Aspect 6 is At least one of the first mold and the second mold further has vertical ribs extending parallel to the direction of movement of the slide of the press.
  • the truss structure is formed by the vertical ribs, the bottom portion and the stiffening member.
  • Aspect 7 is The connection portion of the stiffening member with the bottom portion or the connection portion of the stiffening member with the top portion is widened from the central region of the stiffening member.
  • Aspect 8 is In at least one of the first mold and the second mold, the stiffening member is integrally formed with the bottom and the top.
  • Aspect 9 is In at least one of the first mold and the second mold, the stiffening member is formed as a separate body from the bottom and the top.
  • the mold according to any one of aspects 1 to 7.
  • Aspect 10 is Support device and A slide that descends during press molding, The mold according to any one of aspects 1 to 9, which is arranged between the support device and the slide. Press molding equipment equipped with.
  • the other aspect 1 is A mold comprising a first mold and a second mold, wherein at least one of the first mold and the second mold is With a plate-shaped bottom, A plate-shaped top provided apart from the bottom and A stiffening member that is connected to the bottom and the top and extends from the connection with the bottom toward the top from the bottom to the side where the center of the top is located. Mold with.
  • Another aspect 2 is The stiffening member is provided only in the first mold.
  • Another aspect 3 is The stiffening member is provided only in the second mold.
  • Another aspect 4 is The stiffening member is provided in both the first mold and the second mold.
  • Another aspect 5 is A pair of the stiffening members are arranged so as to sandwich the center of the top.
  • Another aspect 6 is At least one of the first mold and the second mold further has vertical ribs extending parallel to the direction of movement of the slide of the press.
  • the truss structure is formed by the vertical ribs, the bottom portion and the stiffening member.
  • connection portion of the stiffening member with the bottom portion or the connection portion of the stiffening member with the top portion is widened from the central region of the stiffening member.
  • Another aspect 8 is In at least one of the first mold and the second mold, the stiffening member is integrally formed with the bottom and the top.
  • Another aspect 9 is In at least one of the first mold and the second mold, the stiffening member is formed as a separate body from the bottom and the top.
  • the mold according to any of the other aspects 1 to 7.
  • Another aspect 10 is Support device and A slide that descends during press molding, The mold according to any of the other aspects 1 to 9, which is arranged between the support device and the slide. Press molding equipment equipped with.
  • the die and the press forming apparatus According to the die and the press forming apparatus according to the other aspects, it is not necessary to improve the configuration on the press machine side, and the die itself can be directly and relatively easily improved on the side of the work material of the die. Deflection can be suppressed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
PCT/JP2021/037023 2020-10-06 2021-10-06 金型及びプレス成形装置 Ceased WO2022075373A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP21877672.2A EP4227018A4 (en) 2020-10-06 2021-10-06 Mold and press-molding device
CN202180067899.7A CN116348217A (zh) 2020-10-06 2021-10-06 模具及压力成形装置
JP2022555539A JP7513917B2 (ja) 2020-10-06 2021-10-06 金型及びプレス成形装置
US18/028,762 US20230330733A1 (en) 2020-10-06 2021-10-06 Die and press-molding apparatus

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JP2020169395 2020-10-06
JP2020-169395 2020-10-06

Publications (1)

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WO2022075373A1 true WO2022075373A1 (ja) 2022-04-14

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JPS61266147A (ja) 1985-05-17 1986-11-25 Honda Motor Co Ltd 車体外板のトリム加工用トリム下型の鋳型模型
JPH07323400A (ja) 1994-06-03 1995-12-12 Toyota Motor Corp プレス型及びその製造方法
JPH08177165A (ja) * 1994-12-20 1996-07-09 Sumiyoshi Yokozawa 構造材とこの構造材の製造方法とこの構造材の使用方法
JPH11515058A (ja) * 1995-10-31 1999-12-21 マサチューセッツ インスティチュート オブ テクノロジー 固体を利用せずに作製する金型の熱特性改善技術
JP4955923B2 (ja) 2005-01-13 2012-06-20 株式会社小松製作所 ダイクッション装置を備えたプレス機械
US20130180663A1 (en) * 2012-01-03 2013-07-18 Janicki Industries, Inc. Tooling Systems and Methods for Composite Parts
JP5458341B2 (ja) 2011-01-28 2014-04-02 トヨタ自動車株式会社 プレス成形用金型
JP2020169395A (ja) 2020-07-17 2020-10-15 株式会社新光化学工業所 銀ナノ粒子コロイド、銀ナノ粒子、銀ナノ粒子コロイドの製造方法および銀ナノ粒子の製造方法

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FR640972A (fr) * 1927-09-14 1928-07-25 Presse pour façonner les tôles, en particulier celles des membrures de caisses d'automobiles
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JP4432659B2 (ja) * 2004-07-29 2010-03-17 トヨタ自動車株式会社 プレス成形装置およびクッションリング
JP5382231B2 (ja) * 2010-12-22 2014-01-08 トヨタ自動車株式会社 機械プレス用金型
CN103328129B (zh) * 2011-01-28 2015-11-25 丰田自动车株式会社 用于冲压形成用模具铸造的消失模型
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5448856A (en) * 1977-09-26 1979-04-17 Tenryu Giken Kk Method of clamping mold* using wedge
JPS61266147A (ja) 1985-05-17 1986-11-25 Honda Motor Co Ltd 車体外板のトリム加工用トリム下型の鋳型模型
JPH07323400A (ja) 1994-06-03 1995-12-12 Toyota Motor Corp プレス型及びその製造方法
JPH08177165A (ja) * 1994-12-20 1996-07-09 Sumiyoshi Yokozawa 構造材とこの構造材の製造方法とこの構造材の使用方法
JPH11515058A (ja) * 1995-10-31 1999-12-21 マサチューセッツ インスティチュート オブ テクノロジー 固体を利用せずに作製する金型の熱特性改善技術
JP4955923B2 (ja) 2005-01-13 2012-06-20 株式会社小松製作所 ダイクッション装置を備えたプレス機械
JP5458341B2 (ja) 2011-01-28 2014-04-02 トヨタ自動車株式会社 プレス成形用金型
US20130180663A1 (en) * 2012-01-03 2013-07-18 Janicki Industries, Inc. Tooling Systems and Methods for Composite Parts
JP2020169395A (ja) 2020-07-17 2020-10-15 株式会社新光化学工業所 銀ナノ粒子コロイド、銀ナノ粒子、銀ナノ粒子コロイドの製造方法および銀ナノ粒子の製造方法

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US20230330733A1 (en) 2023-10-19
JPWO2022075373A1 (https=) 2022-04-14
EP4227018A1 (en) 2023-08-16
JP7513917B2 (ja) 2024-07-10
EP4227018A4 (en) 2024-04-03

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