| 摘要 |
PURPOSE:To prevent an early occurrence of a crack and a separation and enhance durability by forming paddings at a position corresponding to a valve seat in an aluminum alloy cylinder head and an inter-valve part, and making both paddings continuous to each other. CONSTITUTION:In the manufacture of an aluminum alloy cylinder head, a cylinder head raw material is cast from an aluminum alloy, and subjected to a pertinent process, in accordance with a normal practice. Then, paddings are so applied to valve seat parts 13A and 13B, and an inter-valve part 15A as to be continuous to each other. Thereafter, a finishing process applies whenever necessary. In this case, it is allowed to use a metal or an alloy having heat and abrasion resistance better than the aluminum alloy of a cylinder head base material, and good heat conduction as an alloy used for padding. For example, an alloy of Cu-Ni-Fe and the like are used. And the padding is applied, using a high density energy source such as a laser, a TIG or plasma arc and an electron beam as a heating source. |
