| 摘要 |
PURPOSE:To prevent the deformation of the edges of the openings of a part liner during firing, by forming the main body of a port liner having its extremities closed in bag form by cast molding and cutting off the extremities after the firing to provide openings. CONSTITUTION:The main body 1 of a port liner having its extremities 11 and 12 respectively on the engine side and the exhaust pipe side closed in bag form is formed by cast molding according to the drain casting method. After the draining, the moisture of slurry is absorbed through a mold 3 and ceramic is gradually deposited on the inner surface of the mold. When a desired wall thickness is attained, excessive slurry is again drained through a valve hole 2 to thereby form the main body 1 of a port liner having its extremities closed in bag form. Since the main body 1 is taken out of the mold 3 and fired after it has been formed with its extremities being closed in bag form, the edges of the openings of the port liner do not undergo deformation during firing. |
