| 摘要 |
PROBLEM TO BE SOLVED: To reduce machining operations performed on the production of a cylinder head and a crankcase to be cast. SOLUTION: When a cylinder body and a crankcase are cast, casting tolerances therefor are made tighter in such a manner that, in an as-cast mounting surface, flatness is controlled to≤0.006 inch, and each as-cast hole in a foot flange has a perpendicularity of≤0.002 inch to the mounting surface of the foot flange and is also positioned so as to be≤0.006 inch from the true positional location of each hole in the foot flange. Further, each hole is clogged with a web on the casting, and the same is removed in a poststage to the subsequent machining. COPYRIGHT: (C)2008,JPO&INPIT |
