METHOD FOR MANUFACTURING FORGED CRANKSHAFT

A forged crankshaft production method includes a first preforming step, a second preforming step, and a final preforming step. In the second preforming step, an initial blank (23) is pressed by a first pair of dies (40) to be formed into an intermediate blank. The first pair of dies (40) includes we...

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Bibliographische Detailangaben
Hauptverfasser:	HORI, Masao, OKUBO, Junichi, TAMURA, Kenji, NAKANO, Ryusuke, YOSHIDA, Kunihiro, HWANG, Samsoo
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	BEARINGS BLASTING ELEMENTS OR CRANKSHAFT MECHANISMS ENGINEERING ELEMENTS AND UNITS FLEXIBLE SHAFTS FORGE FURNACES FORGING GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HAMMERING HEATING LIGHTING MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES,RIVETS, BOLTS OR WHEELS MECHANICAL ENGINEERING MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL PERFORMING OPERATIONS PRESSING METAL PUNCHING METAL RIVETING ROTARY BODIES OTHER THAN GEARING ELEMENTS SHAFTS THERMAL INSULATION IN GENERAL TRANSPORTING WEAPONS
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Beschreibung
Zusammenfassung:	A forged crankshaft production method includes a first preforming step, a second preforming step, and a final preforming step. In the second preforming step, an initial blank (23) is pressed by a first pair of dies (40) to be formed into an intermediate blank. The first pair of dies (40) includes web processing parts (42c) to come into contact with portions to be formed into arms and portions to be formed into weights integrated with the arms. Each of the web processing parts (42c) includes an arm processing part (42d) and a weight processing part (42e). The arm processing part (42d) and the weight processing part (42e) form a recessed portion, and the width (Bw) of the open side of the weight processing part becomes greater with increasing distance from the bottom of the recessed portion. Accordingly, in the blank, volume can be distributed between a portion to be formed into an arm and a portion to be formed into a weight integrated with the arm, and the material yield rate can be improved.