Research On Free-form Surface Machining Technology In Cavity Mold

Cavity molds are widely used in various fields of industrial production,but due to the particularity and complexity of free-form surfaces in cavity molds,that is,their structures have narrow processing widths and deep processing depths,which increases the difficulty of processing.It is not easy to guarantee the processing quality,so it puts higher requirements on its processing technology.In the five-axis CNC machining process,the reasonable machining method is inseparable from the machining quality and efficiency of the workpiece.Therefore,the machining technology of the free-form surface in the cavity mold is studied and verified on the DMU-60 five-axis CNC machine tool.The main research contents of this paper are as follows:The free-form surface is constructed by UG,the Gaussian curvature and the average curvature at the discrete points of the free-form surface are calculated,and then the free-form surface is performed regional division according to the processing geometric features.The UG is used to NC programming of the cavity mold,and generate the tool path.The post processor of the machine tool is constructed by UG/Post Builder,and the tool path is post-processed to generate NC machining program.Based on VERICUT,the virtual model of the machine tool is constructed and the free surface of the structure is simulated.The correctness of the NC machining program is verified and the feed rate affecting the machining efficiency is optimized.The machining test was carried out to verify the correctness of the NC machining program and the rationality of the virtual model.The results show that the division of the zone can improve the surface quality of the cavity mold.