Forms the notch path making use of the sand core and this sand core in order to form the notch path of the cylinder head the manner

摘要

PURPOSE: To provide a sand core for forming a water passage in a cylinder head so as to be capable of efficiently cooling a section where the upper wall of a combustion chamber and the surrounding wall of an ignition plug hole intersect, as well as a method for manufacturing a cylinder head, using the sand core. ;CONSTITUTION: Regarding a sand core for forming a water passage 1 in a cylinder head having a combustion chamber 4 where three or more ports are connected around an ignition plug, a support section for mounting an annular tube member 6 not melting into molten metal is mounted at core sections left between core cavities for forming each port laid around the cavities at the formation process of an ignition plug hole 2. Constitution is so made that the member 6 comes to be laid around an ignition plug hole machining section in a product after casting. Thereafter, a cylinder head is cast, using the sand core having the annular tube member 6 at the support section. After casting the cylinder head, a tool is inserted from a sand drain hole emptied of the sand core, and the member 6 is drilled at two or more positions.;COPYRIGHT: (C)1995,JPO