INSPECTING METHOD FOR RE-MELT TREATMENT DEPTH OF AL ALLOY CYLINDER HEAD

摘要

PURPOSE:To easily detect the re-melt treatment depth nondestructively by cutting a protruded section across a re-melt treated portion and an untreated portion, and applying buff polishing and etching treatment to a machined face. CONSTITUTION:The re-melt treatment consisting of the re-fusion process with a TIG arc device 11 and the quick cooling process is applied around the apex of a valve bridge section 7. The preset finish machining is applied to an exhaust valve hole 4 and an intake valve hole 5 across a re-melt treated portion 7a and a re-melt untreated portion 7b, and buff polishing 12 and etching treatment are applied to a mechanically machined face. The difference of irregularities between the machined face of the re-melt treated portion 7a and the machined face of the re-melt untreated portion 7b becomes remarkable, the difference of the light reflection characteristic is generated between the machined faces, and a contrast is generated between both of them. The re-melt treatment depth can be easily detected visually by this contrast.