In this paper, the authors have studed the recognition of machining features for axle- and sleeve-like parts. the machining feature units are divided into the main, the first-level aid- ed, the second-level aided and the third level aided features. the first-level aided feature is named the son feature of the main's etc. For example, if cylindrical surfaces, cones and screw- threadsetc. are to be defined as main features, then end faces, corners, keyways and chamfers etc. can be regarded as the first-level ...
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