Title:
METHOD FOR MANUFACTURING VALVE UMBRELLA PORTION OF HOLLOW ENGINE VALVE, PRESS DEVICE OF VALVE UMBRELLA PORTION OF HOLLOW ENGINE VALVE, AND HOLLOW ENGINE VALVE
Document Type and Number:
WIPO Patent Application WO/2011/077776
Kind Code:
A1
Abstract:
Conventionally, in hot forging of a valve umbrella portion of a hollow engine valve, poor finish accuracy has been provided, and in cold forging thereof, materials which can be used have been restricted. In addition, in the cold forging and the known hot forging, the number of steps for drawing is increased, which requires a large number of steps for intermediate heating processes such as annealing, with the result that the poor workability has been obtained. In view of this, 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 the center in a constant temperature atmosphere at any temperature between a room temperature and 870ºC (second step).
Inventors:
YOSHIMURA Hyoji (2685-173, Aza Minamihara Oaza Nakashidami, Moriyama-k, Nagoya-shi Aichi 02, 〒4630002, JP)
Application Number:
JP2010/061933
Publication Date:
June 30, 2011
Filing Date:
July 15, 2010
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES, LTD. (16-5, Konan 2-chome Minato-k, Tokyo 15, 〒1088215, JP)
三菱重工業株式会社 (〒15 東京都港区港南二丁目１６番５号 Tokyo, 〒1088215, JP)
YOSHIMURA COMPANY (2685-173, Aza Minamihara Oaza Nakashidami, Moriyama-k, Nagoya-shi Aichi 02, 〒4630002, JP)
三菱重工業株式会社 (〒15 東京都港区港南二丁目１６番５号 Tokyo, 〒1088215, JP)
YOSHIMURA COMPANY (2685-173, Aza Minamihara Oaza Nakashidami, Moriyama-k, Nagoya-shi Aichi 02, 〒4630002, JP)
International Classes:
B21K1/22; B21J5/06; B21J5/08; F01L3/20; F01L3/24
Attorney, Agent or Firm:
MITSUISHI Toshiro et al. (Mitsuishi Law and Patent Office, 9-15 Akasaka 1-chome, Minato-k, Tokyo 52, 〒1070052, JP)
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