TEST METHOD FOR STRETCH FLANGE MOLDING PERFORMANCE OF METAL PLATE FOR PRESS MOLDING

• Main Authors: MINOTE TORU, ISHIWATARI AKINOBU, TATSUKAWA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 10.04.2023
• 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 test method for stretch flange molding performance of a metal plate for press molding that can correctly evaluate stretch flange molding performance of a blank material for a press-molded product with a complicated deformation state like a bifurcation of a lower arm.SOLUTION: A test method for stretch flange molding performance of a metal plate for press molding tests stretch flange molding performance of a metal plate for press molding for the purpose of molding a press-molded product which has a branch part 7 comprising a top plate part 3 branching into two branches in a plan view and a vertical wall part 5 continuous with the top plate part 3, and in which the vertical wall part 5 of the branch part 7 is stretch-flange deformed. A branch part molding surface part 25, which molds the branch part 7, performs press try for the metal plate for press molding by use of a plurality of metal molds 27, 29 that are so located as to become line symmetry in a plan view, and stretch flange molding performance of the metal plate for press molding is evaluated depending on existence or absence of occurrence of cracks in the vertical wall part 5 which is stretch-flange deformed.SELECTED DRAWING: Figure 1 【課題】ロアアームの分岐部のように複雑な変形状態となっているプレス成形品に対して、ブランク材料の伸びフランジ成形性能の評価を正確に行うことができるプレス成形用金属板の伸びフランジ成形性能試験方法を提供する。【解決手段】本発明に係るプレス成形用金属板の伸びフランジ成形性能試験方法は、平面視で二股に分岐する天板部３と天板部３に連続する縦壁部５からなる分岐部７を有し、プレス成形過程において分岐部７の縦壁部５が伸びフランジ変形するプレス成形品を成形するためのプレス成形用金属板の伸びフランジ成形性能を試験する方法であって、分岐部７を成形する分岐部成形面部２５が、平面視で線対称となるように複数配置された金型２７、２９を用いて、前記プレス成形用金属板に対してプレストライを実施し、前記伸びフランジ変形する縦壁部５における割れの発生の有無によって前記プレス成形用金属板の伸びフランジ成形性能を評価する。【選択図】 図１