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JP-7856867-B1 - Press die, and method for manufacturing press-formed products formed by the die.

JP7856867B1JP 7856867 B1JP7856867 B1JP 7856867B1JP-7856867-B1

Abstract

The upper die (30) of the press die (11) comprises an upper die body (31) that is movable in the vertical direction, a first rotating die (40) whose first outer peripheral surface (40a) rotates relative to the first sliding surface (31a) of the upper die body (31) and is capable of bending the sheet material (12) toward the first side surface (22), and a second rotating die (50) whose second outer peripheral surface (50a) rotates relative to the second sliding surface (31b) of the upper die body (31) and is capable of bending the sheet material (12) toward the second side surface (25). The first rotating die (40) and the second rotating die (50) overlap in the longitudinal direction (L) of the press-formed product (60).

Inventors

  • トーマス ニック

Assignees

  • 株式会社ジーテクト

Dates

Publication Date
20260511
Application Date
20250710

Claims (12)

  1. In a press die comprising an upper die and a lower die, capable of obtaining a press-formed product by bending a sheet material, The lower mold has a support surface capable of supporting the plate material, a first side surface extending downward from one end of the support surface, and a second side surface extending downward from the opposite end of the support surface. The aforementioned upper mold is, An upper body that can move vertically, A first rotating mold in which the first outer surface rotates relative to the first sliding surface of the upper mold body, and the plate material can be bent toward the first side surface, The device comprises a second rotating mold whose second outer surface rotates relative to the second sliding surface of the upper mold body, thereby enabling the plate material to be bent toward the second side surface, A press die in which the first rotating die and the second rotating die overlap in the longitudinal direction.
  2. The first rotating type has at least one first top wall forming portion that sandwiches the plate material together with the support surface, The second rotating type has at least one second top wall forming portion that sandwiches the plate material together with the support surface, The first top wall forming section and the second top wall forming section are arranged alternately along the length direction of the press-formed product. The press die according to claim 1.
  3. The first rotational type is, A first side wall forming portion is formed along the entire length and sandwiches the plate material together with the first side surface of the lower mold, The first pressing portion is adjacent to the first top wall forming portion and holds down the plate material placed on the support surface, drives the rotation of the first rotary type, The aforementioned second rotary type is, A second side wall forming portion is formed along the entire length and sandwiches the plate material together with the second side surface of the lower mold, The plate material placed on the support surface is held down, the rotation of the second rotary type is driven, and the second pressing part is adjacent to the second top wall forming part, In the cross-section including the first top wall forming portion, the first side wall forming portion, the first pressing portion, and the second side wall forming portion are included. In the cross-section including the second top wall forming portion, the second side wall forming portion, the second pressing portion, and the first side wall forming portion are included. The press die according to claim 2.
  4. To prevent the first rotating mold from falling from the upper mold body, a first holding member having a first holding surface that holds the first outer surface of the first rotating mold, The system includes a second retaining member having a second retaining surface that holds the second outer surface of the second rotating mold, so as to prevent the second rotating mold from falling from the upper mold body, The press die according to claim 1.
  5. The first sliding surface of the upper mold body and the first holding surface of the first holding member are smoothly connected. The second sliding surface of the upper mold body and the second holding surface of the first holding member are smoothly connected. The press die according to claim 4.
  6. The cross-section of the aforementioned press-formed product is hat-shaped, The lower mold has a first bottom surface extending laterally from the first side surface and a second bottom surface extending from the second side surface to the opposite side of the first bottom surface. The first rotating mold extends laterally from the first side wall forming portion and has a first flange forming portion that sandwiches the plate material together with the first bottom surface. The second rotating mold extends laterally from the second side wall forming portion and includes a second flange forming portion that, together with the second bottom surface, sandwiches the plate material. The press die according to claim 3.
  7. After the press-formed product is formed, the first and second rotary molds are prevented from rotating further. The first rotating mold has a first contact portion that contacts the lower mold, The second rotating mold has a second contact portion that contacts the lower mold. The press die according to claim 1.
  8. A first elastic part applies force to the first rotating mold so that the first rotating mold rotates in the opposite direction to the bending direction of the plate material, The system includes a second elastic part that applies force to the second rotating mold so that the second rotating mold rotates in the opposite direction to the bending direction of the plate material, The press die according to claim 1.
  9. The first rotating type is composed of a plurality of first members connected in the longitudinal direction, The second rotating type is composed of a plurality of second members connected in the longitudinal direction. The press die according to claim 1.
  10. The distance between the first sidewall forming portion of the first rotary mold and the second sidewall forming portion of the second rotary mold, and the width between the first side surface and the second side surface of the lower mold are, The width of the cross-section of the aforementioned press-formed product differs depending on the position in the longitudinal direction. It is set The press die according to claim 3.
  11. The width between the first and second sides of the lower mold narrows as it goes downwards. The press die according to claim 1.
  12. A method for manufacturing a press-formed product by bending a sheet metal using a press die comprising an upper die and a lower die, The lower mold has a support surface capable of supporting the plate material, a first side surface extending downward from one end of the support surface, and a second side surface extending downward from the opposite end of the support surface. The aforementioned upper mold is, An upper body that can move vertically, A first rotating mold in which the first outer surface rotates relative to the first sliding surface of the upper mold body, and the plate material can be bent toward the first side surface, The device comprises a second rotating mold whose second outer surface rotates relative to the second sliding surface of the upper mold body, thereby enabling the plate material to be bent toward the second side surface, A method for manufacturing a press-formed product, wherein the first rotating mold and the second rotating mold overlap in the longitudinal direction of the press-formed product.

Description

This invention relates to a press die equipped with a rotating die. Patent Document 1 discloses a press die for forming a press-formed product by bending both ends of a sheet material through press working. This press die comprises a lower die for supporting the sheet metal, a pad for holding down the sheet metal placed on the lower die, and an upper die for bending both ends of the sheet metal. The upper die comprises an upper die body that is movable in the vertical direction, and a pair of rotating dies that are pressed by the upper die body and rotate to bend the sheet metal. As the upper die body descends, the pads press down on the sheet metal placed on the lower die, and each rotating die rotates to approach the side of the lower die. This allows a load to be applied to the bent portion of the sheet metal. This bending process, which bends both ends of the sheet metal, suppresses springback, warping, and buckling (localized warping) compared to the drawing process where shear load is applied to the vertical walls. German Patent Application Publication No. 102008015163 This is a diagram illustrating a press machine equipped with the press die of Example 1.Figure 1 is a perspective view of the lower die of a press mold.Figure 1 is a schematic diagram showing the state of the press die at the start of molding.Figure 3 is a schematic diagram of the press die during the molding process.Figure 3 is a schematic diagram of the press die after the molding process is complete.Figure 1 is a perspective view of a press-formed product formed by the press die shown in Figure 1.This is a view of the upper mold from below.This is a view of a portion of the upper mold from below.This is a view from above of parts of the first and second rotation types.This is a cross-sectional view taken along line 10-10 in Figure 9.This is a view from below of the first and second rotating molds after the molding process is complete.This is a perspective view of the press die of Example 2.Figure 12 is a perspective view of a press-formed product formed by a press die.This is an exploded perspective view of the lower die of the press mold in Example 3.This is a view of the upper die of the press mold in Example 3, seen from below. <Examples> Examples will be described based on the attached figures. Note that the examples described here are not intended to particularly limit the present invention. The elements constituting each example can be combined as appropriate. Furthermore, the same reference numerals are used for members and parts that perform the same function, and redundant explanations are omitted or simplified as appropriate. In the figures, Fr indicates front, Rr indicates rear, Le indicates left, Ri indicates right, Up indicates top, and Dn indicates bottom. The front-to-back direction is also the length direction L of the press-formed product 60 (see Figure 6), and the left-to-right direction is also the width direction W of the press-formed product 60. Refer to Figure 1. The press machine 10 has a press die 11 of Embodiment 1 fixed to it for bending sheet metal 12 (blank material). The press machine 10 is equipped with a bolster 16 and a slide 17 that can move up and down relative to the bolster 16. The slide 17 is provided with a guide pillar 18 that protrudes downward. The bolster 16 is provided with a guide bush 19 having an inner circumferential surface on which the guide pillar 18 slides. The lower die 20 of the press die 11 is fixed to the bolster 16. The upper die 30 of the press die 11 is fixed to the slide 17. (lower mold) Refer to Figure 2. The lower mold 20 has a support surface 21 capable of supporting the plate material 12, a first side surface 22 extending downward from the left end (one end) of the support surface 21, a first bottom surface 23 extending to the left from the lower end of the first side surface 22, a second side surface 25 extending downward from the right end (opposite end) of the support surface 21, and a second bottom surface 26 extending from the second side surface 25 to the opposite side of the first bottom surface 23. (Width of the bottom mold) The width W1 between the first side 22 and the second side 25 of the lower mold 20 narrows as it goes downwards. However, the width W1 may remain constant. (plate material) Of the plate material 12, the portion supported by the support surface 21 is designated as the intermediate portion 12a, the portion to the left (one side) of the intermediate portion 12a is designated as the first portion 12b, and the portion to the right (opposite side) of the first portion 12b is designated as the second portion 12c. The material of the plate material 12 is steel, but other materials such as aluminum alloy, which are materials used for parts that make up the vehicle body, can also be used. (upper mold) Refer to Figure 3. The upper mold 30 is fixed to the slide 17 and includes an upper mold body 31 that can move up and down together with the slide 17, a f