Title:
中空エンジンバルブの製造方法
Document Type and Number:
Japanese Patent JP5574752
Kind Code:
B2
Abstract:
A method for manufacturing a hollow engine valve, capable of simplifying the manufacturing process and reducing the manufacturing cost. A method for manufacturing a hollow engine valve is configured in such a manner that, in order to form the hollow shaft section of a half-finished product (1a) into a predetermined shape, the hollow shaft section is inserted in sequence into die holes (M1, M2, M(m-1), Mm, M(n-1), Mn'), which have different hole shapes, and subjected in sequence to drawing so as to reduce the outer diameter and the inner diameter of the hollow shaft section in stages and so as to stretch the length of the hollow shaft section in stages. In the method, the half-finished product (1a) is subjected to heat treatment so that the hardness thereof is lower than or equal to a predetermined level, a shaft end sealing section (15) is formed by increasing the wall thickness of the opening end of the hollow shaft section (12) toward the inside of the opening end by the die hole (Mn') of a die (Din'), the die hole (Mn') having an inner diameter adjusted to d2', and the gap in the shaft end sealing section (15) is welded.
Inventors:
Hirokazu Morii
Yoshimura 豹治
Yoshimura 豹治
Application Number:
JP2010041411A
Publication Date:
August 20, 2014
Filing Date:
February 26, 2010
Export Citation:
Assignee:
Mitsubishi Heavy Industries, Ltd.
Incorporated company Yoshimura Company
Incorporated company Yoshimura Company
International Classes:
B21K1/22; B21D41/04; B21D53/84; B21J5/08; F01L3/24
Attorney, Agent or Firm:
Toshiro Mitsuishi
Tadataka Mitsuishi
Yasuyuki Tanaka
Matsumoto 洋
Tadataka Mitsuishi
Yasuyuki Tanaka
Matsumoto 洋