| Summary: | 碩士 === 淡江大學 === 航空太空工程學系 === 88 === This research is concerned with experimental investigations of the precision measurement of thin plate of engine parts after machining. The major factors for choice as an engine part is their high strength-to-weight ratio, high temperature resistance and anticorrosive capability. Due to its very high strength-to-weight ratio, the thin plate superalloy or Ti-alloy has been widely used in aircraft or commercial ground engines. However, the precision variations of thin plate during machining become its main drawback. The main reasons were induce by their ingredients, e.g. C23 diffusion in iron phase for A286 iron-based superalloy, and also caused by stress concentration. According to the general aviation standard, all the tolerances have been achieved during machining and can not be done by the strengthening or other processes. The ongoing machining processes for thin plate were let the parts set for a few hours and continued to second process or machining the alternative face each time. These processes cost a lot of time to get the required dimensions. This work has been conducted use precision measurement to find the variation about these kinds thin plate and further to control the machining processes.
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