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1. (WO2013111768) HOT UPSET FORGING METHOD

Pub. No.:    WO/2013/111768    International Application No.:    PCT/JP2013/051269
Publication Date: Fri Aug 02 01:59:59 CEST 2013 International Filing Date: Thu Jan 24 00:59:59 CET 2013
IPC: B21J 5/08
B21J 1/04
Applicants: HITACHI METALS,LTD.
日立金属株式会社
Inventors: TOGA Takashi
栂 貴志
MATSUMOTO Hideki
松本 英樹
SHIGIHARA Yusuke
鴫原 祐介
Title: HOT UPSET FORGING METHOD
Abstract:
Provided is a hot upset forging method which can achieve excellent shape precision. A hot upset forging method in which a material to be processed (1), of which h/d is more than 3 (d being base surface diameter and h being height), is inserted into an insertion hole, having a given height (H) and penetrating a metal mold (2) placed on an anvil block (4), and then the height of the material to be processed (1) is reduced and the diameter is increased, forming forged steel. The hot upset forging method is characterised by using a metal mold satisfying the following relationships (1)-(3). (1) The shape of the insertion hole and the shape of the cross-section of the material to be processed are substantially similar shapes; (2) the height of the item to be processed (1) ≤ the height (H) of the metal mold (2); (3) the maximum diameter (dl) of the material to be processed (1) and the maximum internal diameter (D) of the insertion hole in the range of the height of the material to be processed: dl < D ≤ dl x 1.5