PRESS MOLDING METHOD AND PRESS MOLDING DIE

• Main Authors: MINOTE TORU, ISHIWATARI AKINOBU, TATSUKAWA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 30.05.2022
• Subjects: MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL; PERFORMING OPERATIONS; PUNCHING METAL; TRANSPORTING; WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL

To provide a press molding method and a press molding die that prevent cracking of a tip of a vertical wall part formed at a branch central part and bent back portions on both sides of the branch at the same time, in molding a press-molded article including a biforked top plate part and the vertical wall part continuous to the top plate part.SOLUTION: A press molding method includes: a first molding step S1 of overhang molding a top plate part 1, a first bent part 2, an intermediate vertical wall part 9 being a base end side of a vertical wall part 3, a second bent part 11, and a shelf part 13; a trimming step S3 of forming a flange part 25 by removing an unnecessary part from the shelf part 13; and a second molding step S5 of bending back the second bent part 11 and molding the vertical wall part 3. The press molding method performs the molding such that a bending radius R1C of a branch central part at the first bent part 2, a bending radius R1S of portions on both sides in a bending ridge line direction of the branch central part, a bending radius R2C of a branch central part at the second bent part 11, and a bending radius R2S of portions on both sides in the bending ridge line direction of the branch central part satisfy relationships of R2C<R2S and R2C<R1C and R1S≤R1C.SELECTED DRAWING: Figure 1 【課題】二股に分岐する天板部と、該天板部に連続する縦壁部を備えたプレス成形品を成形する際、分岐部中央部に形成される縦壁部の先端と、分岐部両側部における曲げ戻した部分の割れを同時に防止するプレス成形方法及びプレス成形金型を提供する。【解決手段】本発明に係るプレス成形方法は、天板部１と、第１屈曲部２と、縦壁部３の基端側となる中間縦壁部９と、第２屈曲部１１と、棚部１３を張り出し成形する第１成形工程Ｓ１と、棚部１３から不要部を除去してフランジ部２５を形成するトリム工程Ｓ３と、第２屈曲部１１を曲げ戻して、縦壁部３を成形する第２成形工程Ｓ５とを備え、第１屈曲部２における分岐部中央部の曲げ半径R1C、分岐部中央部の曲げ稜線方向両側の部分の曲げ半径R1S、第２屈曲部１１における分岐部中央部の曲げ半径R2C、分岐部中央部の曲げ稜線方向両側の部分の曲げ半径R2Sが、R2C＜R2SかつR2C＜R1CかつR1S≦R1Cの関係を満たすように成形する。【選択図】 図１