Abstract: [Objective]In agricultural mechanization operation, wheel-parts are often used to assist the mechanism to realize the walking function. Selecting acrylic as the material, the author designed a lightweight walking structure, composed of two same wheel parts through thread connection, in the operation of the mechanical equipment before and after the installation of two groups to form the equipment walking system. [Method] Systematic process analysis of the wheel-part is carried out from many aspects such as machine-selection, clamping-design, tool-use, blank determination, etc. CNC machining process card is not only compiled, but also the application of CNC machining programming strategy based on NX is studied. This part includes characteristics such as step-hole, through-hole, ring-roove, radial countersink, thread and so on. The machining strategies such as plane milling, fixed drilling, fixed milling, variable-milling and thread were comprehensively used for programming, and the cutting parameters (cutting mode, boundary, depth range, cutting layer, margin, etc.), non-cutting parameters (feed, retreat, etc.), machining parts, tool shafts, tools and driving factors were optimized for different strategies involved in different characteristics. Finally, the correctness of the CNC machining technology of the part was further verified by the physical machining in Demaji DMU50 five-axis machining center. [Result] Via test, the accuracy of the part meets the requirements, and the overall result is good. [Conclusion] Through targeted practice, it not only improves the comprehensive ability of CNC technology, but also deepens the awareness of quality and efficiency, and provides a reference basis for CNC processing of acrylic parts, which has certain positive significance.
Keywords: CNC machining; machining technology; machining strategy