Title:
HOLLOW ENGINE VALVE AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2016/031455
Kind Code:
A1
Abstract:
The present invention provides a hollow engine valve achieving high durability while suppressing an increase in manufacturing cost, and a manufacturing method therefor. A manufacturing method for a hollow engine valve (1) comprises: a step of forming, by forging, a solid round bar (12) as a material of a valve main body (2) into a valve main body intermediate member (18) provided with a semifinished product valve head portion (14) corresponding to a valve head portion (6) and a solid stem portion (16) corresponding to a valve stem portion (8); a step of performing cutting process with respect to the valve main body intermediate member across the solid stem portion and the semifinished product valve head portion for forming a semifinished product hollow hole (20) with a bottom corresponding to a hollow hole (10), thereby forming the valve main body intermediate member into a valve main body semifinished product (24) provided with the semifinished product valve head portion and a semifinished product valve stem portion (22); and a step of performing necking process with respect to the valve main body semifinished product for squeezing the semifinished product valve stem portion step by step, thereby reducing the diameter of the semifinished product valve stem portion and increasing the length of the stem of the semifinished product valve stem portion, to form the valve main body semifinished product into the valve main body.
Inventors:
MORII HIROKAZU (JP)
NISHIO HIDENOBU (JP)
HIRAO KENICHIRO (JP)
NISHIO HIDENOBU (JP)
HIRAO KENICHIRO (JP)
Application Number:
PCT/JP2015/071070
Publication Date:
March 03, 2016
Filing Date:
July 24, 2015
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
International Classes:
F01L3/12; B21K1/22; F01L3/20; F01L3/24
Domestic Patent References:
| WO2012168136A1 | 2012-12-13 |
Foreign References:
| JPS56147305U | 1981-11-06 | |||
| JPH0447106A | 1992-02-17 | |||
| JPH04334708A | 1992-11-20 | |||
| JP2013155676A | 2013-08-15 | |||
| JP2010094732A | 2010-04-30 |
Attorney, Agent or Firm:
TSUJII Koichi et al. (JP)
辻居 Koichi (JP)
辻居 Koichi (JP)
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