| 摘要 |
PURPOSE:To manufacture a cylinder head, which prevents the lowering of compression ratio and the development of abnormal combustion, etc., by remelting the part of the cast cylinder head raw material to be necessary to excellent thermal fatigue characteristic and executing boring work to the completing part of this remelting. CONSTITUTION:The Al alloy-made cylinder head raw material for gasoline engine is produced with low pressure casting method and laid on X-Y table. Successively, the X-Y table is shifted under irradiating the high energy beam from TIG arc 3 and the irradiation is executed to part between an inlet port 11 and an exhaust port 12 and the part from n point to D point is remelted in succession, to form the remelting part 14. The raw material 1 treated in such way is water-cooled after holding it at about 535 deg.C for about 4hr and again reheated and held to at about 180 deg.C for about 6hr, to execute T6 treatment. Further, after boring a plug hole with machining to the completing point D of the remelting, ASSY is executed, to manufacture the cylinder head. |
