Method for manufacturing valve umbrella portion of hollow engine valve, press device of valve umbrella portion of hollow engine valve, and hollow engine valve

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United States of America Patent

PATENT NO 8650752
APP PUB NO 20120228538A1
SERIAL NO

13502902

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Abstract

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A semi-finished product having a hollow and an expansion diameter portion is manufactured in advance (first step), and a press device for folding an outer cylinder (4) and an inner cylinder (5) around an entire die set (DS) is used, thereby performing drawing with a body of the semi-finished product as the center in a constant temperature atmosphere at any temperature between a room temperature and 870° C. (second step).

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Patent Owner(s)

Patent OwnerAddress
FUJI OOZX INC1500-60 MISAWA KIKUGAWA-SHI SHIZUOKA 4390023

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yoshimura, Hyoji Nagoya, JP 12 114

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