Provided is a burring processing method, which is a method for forming a burring processed portion including a raised portion and a curved portion in a metal component having a pilot hole formed therein, the method being characterized by including: a preforming step of enlarging a diameter of the pilot hole, moving an edge portion of the pilot hole relative to the metal component in a first direction of a thickness direction of the metal component in a first range around the pilot hole of the metal component, and forming the whole first range into a preformed portion raised from the metal component in the first direction; and a main forming step of deforming the preformed portion in a second direction opposite to the first direction, forming a second range on an outer diameter side of the preformed portion to have the same height as the first range in the first direction, and forming part of a third range on an inner diameter side of the preformed portion from the second range to be part of the curved portion and the raised portion.
BURRING METHOD, BURRING DIE, BURRING DEVICE, AND BURRED ARTICLE
ENTGRATUNGSVERFAHREN, ENTGRATMATRIZE, ENTGRATUNGSVORRICHTUNG UND ENTGRATTER ARTIKEL
PROCÉDÉ, MATRICE ET DISPOSITIF D'ÉBAVURAGE, ET ARTICLE ÉBAVURÉ
2024-10-16
Patent
Electronic Resource
English
IPC: | B21D WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL , Bearbeiten oder Verarbeiten von Blechen, Metallrohren, -stangen oder -profilen ohne wesentliches Abtragen des Werkstoffs / B60G VEHICLE SUSPENSION ARRANGEMENTS , Radaufhängungen und Federungen für Fahrzeuge |
European Patent Office | 2025
|European Patent Office | 2024
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