| 摘要 |
A cooling water channel core (40) that is used for casting of the cylinder head (101) includes a core body (41) for obtaining a channel (20, 60, 70) that passes through the periphery of a plurality of intake valve insertion holes (7), and a core print (46) that is integrally formed with the core body (41) at a location that is between an adjacent two combustion chambers of the core body (41) and that comes in contact with an outer casting mold (50) in a casting mold manufacturing step. When the cooling water channel core (40) is arranged inside the outer casting mold (50) and casting is performed, a cylinder head (101) is manufactured that has an opening portion (30) that opens in an outer face from the cooling water channel (20, 60, 70). The opening portion (30) is sealed by a sealing plug (32, 36) after being utilized for sand extraction and inspection. |
