PRESS MOLDING METHOD AND MANUFACTURING METHOD OF PRESS FORMED PRODUCT

• Main Authors: TOBITA SHUNSUKE, IIZUKA EIJI
• Format: Patent
• Language: English; Japanese
• Published: 30.05.2023
• 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 manufacturing method of a press formed product which can suppress spring back of a top plate part that curves in an upward-convex shape in a longer direction in a press formed product having an U-shaped cross-sectional shape.SOLUTION: A press molding method is a method for a press formed product 1 having a U-shaped cross-sectional shape with a bend part bending in a longer direction in a plane view. The press formed product 1 has a following relation: Ha>Hb>Hc in which Ha is height of a vertical wall part A to be a shrink flange deformation part in the bend part, Hb is height of a vertical wall part B that is one of both side vertical walls sandwiching the vertical wall part A, and Hc is height of a vertical wall part C that is the other of both side vertical walls sandwiching the vertical wall part A. The press molding method comprises: a press molding process for an intermediate formed product forming from a metal plate an intermediate formed product 15 in which a vertical wall height of the vertical wall part B is higher than a vertical wall height of the vertical wall part A; and a trimming process which performs trimming of the vertical wall part B by sandwiching the intermediate formed product 15 with trimming molds so that the vertical wall height of the vertical wall part B becomes Hb that is the vertical wall height of the press formed product 1.SELECTED DRAWING: Figure 1 【課題】コ字断面形状のプレス成形品における天板部が長手方向凸状に反るスプリングバックを抑制できるプレス成形方法およびプレス成形品の製造方法を提供する。【解決手段】本発明に係るプレス成形方法は、平面視で長手方向に湾曲する湾曲部を有するコ字断面形状のプレス成形品１であって、湾曲部における縮みフランジ変形部となる縦壁部Ａの縦壁高さＨaと、縦壁部Ａを挟む両側の縦壁の一方である縦壁部Ｂの縦壁高さＨbと、縦壁部Ａを挟む両側の縦壁の他方である縦壁部Ｃの縦壁高さＨcとの関係が、Ｈa＞Ｈb＞Ｈcとなっているプレス成形品１のプレス成形方法であって、金属板を、縦壁部Ｂの縦壁高さが前記縦壁部Ａの縦壁高さ以上の中間成形品１５を成形する中間成形品プレス成形工程と、中間成形品１５をトリミング用金型で挟んで、縦壁部Ｂの縦壁高さがプレス成形品１の縦壁高さであるＨｂになるように縦壁部Ｂをトリミングするトリミング工程とを備える。【選択図】 図１