| 摘要 |
PURPOSE:To improve the mechanical characteristic of a high load part of a cylinder head by irradiating high-density energy to a necessary part of a cylinder head made of an Al alloy casting, and heating and remelting it. CONSTITUTION:A necessary part of an inter-valve part 4, etc. between an intake port use hole 2 and an exhaust hole 3 of a cylinder head body 1 for a Diesel engine, etc. made of an Al alloy casting of JIS AC2B, etc. is remelted by a high density energy of an electron beam, a laser, a TIG or a plasma arc, etc. After this remelting treatment has been executed, a heat treatment (T6) is performed for the cylinder head 1. According to such a method, a casting defect of a high load part of the cylinder head 1 is solved, the specific gravity is improved, also the structure is fined and the mechanical characteristic is improved, and also the treatment of a large quantity can be executed easily. |
