Method of manufacturing engine valve intermediate product with boss portion

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 11285570
APP PUB NO 20210245309A1
SERIAL NO

17239692

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Abstract

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A method of manufacturing an engine valve intermediate product with a boss portion formed in integral fashion at an outer circumferential surface at an intermediate location on a stem forming portion. The manufacturing method may comprise a stem retaining operation in which an intermediate location of the stem forming portion is retained by a plurality of intermediate jigs removably installable radially with respect to a center of the stem forming portion, and a base end portion is retained by a base end jig. The manufacturing method may further comprise a stem enlarging operation in which compressive forces are applied from both ends of the intermediate product and the boss portion is formed as the intermediate product is made to rotate and alternating loads that cause tensile forces and compressive forces to act in repeated and alternating fashion at the outer circumferential surface of the stem forming portion are applied.

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Patent Owner(s)

Patent OwnerAddress
NITTAN CORPORATION518 SOYA HADANO-SHI KANAGAWA 2570031 ?2570031

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ichimiya, Atsuyuki Isehara, JP 2 8
Kurahashi, Kazunori Nakai-machi, JP 11 20

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