Press forming method

A press forming apparatus (1a) consecutively carries out: a first step of pushing a flat plate-shaped workpiece into a die (14) by a forming punch (11), to form the workpiece into a cup-shaped workpiece (B); a second step of making the cup-shaped workpiece (B) move relatively to a position where a s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Wada Yasuhiro, Yamagata Mitsuharu, Yamamoto Shuji
Format:	Patent
Sprache:	eng
Schlagworte:	MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS 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
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Beschreibung
Zusammenfassung:	A press forming apparatus (1a) consecutively carries out: a first step of pushing a flat plate-shaped workpiece into a die (14) by a forming punch (11), to form the workpiece into a cup-shaped workpiece (B); a second step of making the cup-shaped workpiece (B) move relatively to a position where a space (S2) is formed between a cup bottom part (B2) and the forming punch (11) by a holding down member (12) abutting on an end part of a cup vertical wall part (B1); and a third step of making a counter punch (13) approach the forming punch (11), to push a cup bottom part (B2) to a forming punch (11) side so that the cup bottom part (B2) is compressed by the forming punch (11) and the counter punch (13), making a material of the cup vertical wall part (B1) flow to a cup shoulder part (B3), thereby to thicken the cup shoulder part (B3).