Title:
SEAT FACED POPPET VALVE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2011/058793
Kind Code:
A1
Abstract:
A method for producing a large-sized poppet valve which comprises a facing step for welding a facing material into a seat facing groove of a head, wherein the matrix of the valve comprises an Ni-rich base material and, in the facing step, the facing material is welded while cooling the head end face side. In the Ni-rich base material, sediments increase in a gamma prime phase due to the welding heat and crystal grains develop so that crack sensitivity increases. Since the large-sized valve has a large welding area and thus a large heat stress (shrinkage force caused by solidification) occurs at the boundary between the matrix (3) and the faced part (2), it is feared that hot crack arises in a heat affected part (3a) of the matrix along the faced part (2). However, in the aforesaid method, the head end face side is cooled with a cooling metal (20) in the facing step so that the period where a solid phase coexists with a liquid phase in the heat affected part (3a) of the matrix is shortened. Thus, the amount of the sediments in the gamma prime phase and the shrinkage force caused by solidification are both lowered, and, therefore, no hot crack occurs.
Inventors:
KURAHASHI Kazunori (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
倉橋 一憲 (〒31 神奈川県秦野市曽屋５１８番地 日鍛バルブ株式会社内 Kanagawa, 〒2570031, JP)
YASUIKE Makoto (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
倉橋 一憲 (〒31 神奈川県秦野市曽屋５１８番地 日鍛バルブ株式会社内 Kanagawa, 〒2570031, JP)
YASUIKE Makoto (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
Application Number:
JP2010/062681
Publication Date:
May 19, 2011
Filing Date:
July 28, 2010
Export Citation:
Assignee:
NITTAN VALVE CO., LTD. (518 Soya, Hadano-shi Kanagawa, 31, 〒2570031, JP)
日鍛バルブ株式会社 (〒31 神奈川県秦野市曽屋５１８番地 Kanagawa, 〒2570031, JP)
KURAHASHI Kazunori (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
倉橋 一憲 (〒31 神奈川県秦野市曽屋５１８番地 日鍛バルブ株式会社内 Kanagawa, 〒2570031, JP)
日鍛バルブ株式会社 (〒31 神奈川県秦野市曽屋５１８番地 Kanagawa, 〒2570031, JP)
KURAHASHI Kazunori (LTD. 518 Soya, Hadano-sh, Kanagawa 31, 〒2570031, JP)
倉橋 一憲 (〒31 神奈川県秦野市曽屋５１８番地 日鍛バルブ株式会社内 Kanagawa, 〒2570031, JP)
International Classes:
B23K9/04; B21K1/22; B23K10/02; B23K31/00; F01L3/02; F01L3/20; F01L3/24
Attorney, Agent or Firm:
YAGI Hidehito et al. (AOBA INTERNATIONAL PATENT & TRADEMARK Stork Building Hongoku 5F, 3-2-6 Nihonbashi Hongoku-ch, Chuo-ku Tokyo 21, 〒1030021, JP)
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