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                                                            Abstract

                                                            ¡¡¡¡CNC machine tools, especially CNC machine-center, have been widely used in the milling machining of the mold cavities.  The CAM functions of a lot of software, such as UG NX, MasterCAM£¬Cimatron, etc. have been gradually developed and increased. However, at present, even if the most advanced CNC programming software needs the technicians to make technique and to select suitable tools and cutting parameters. The efficiency and machining quality has been decided by the level of the programming technicians to some extent. At the same time, although the geometrical shapes are various, the varieties of its characteristic are finite and every machining characteristic has one or many finite machining method of UG By analyzing, contrasting, researching and concluding these methods, they can guide the program in UG CAM and enhance the machining efficiency and quality.

                                                            ¡¡¡¡The paper mainly researched the optimization of the CNC machining technique for the mold cavities, aiming to reduce the degree of the efficiency and processing quality of the CNC machining which are depended by the technicians. Also, this paper offers the guides and references for the technicians to optimize the technique design and to write the better CNC machining programs.

                                                            ¡¡¡¡The paper researched the technique optimization of CNC machining of mold cavity. At first, it introduced the CNC milling tools and the cutting amount. After analyzing the characteristic combination of mold cavity machining and making the characteristic decomposition, the machining methods and tools of various typical characteristics were decided. The paper offered the coarse milling machining combination methods of mold cavities, and contrasted and analyzed them. Then, the paper analyzed the CNC machining technique of cavity mold of cylinder cap, made the machining technique scheme, rationally selected the tools combination, wrote the program and made simulation. At last, aiming at machining error generated by tools deformation in the field CNC machining, the paper discussed the influence of machining quality to the parts because of various extended length of milling tool when processing the slot, column cavity and slope. Also it analyzed them in quantity and quality and offered the references and gist for the programming technicians.

                                                            ¡¡¡¡Key Words   Mold Cavities;CNC machining technique;Tools Combination;Extended Length of Milling Tool

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