Research On Technological Test And Tool Path Optimization At Corner In High Speed Milling

Different from the traditional processing method, high speed machining can get high metal removal rate and good process quality. With multiaxis CNC and high cutting speed,high speed machining center shows high efficiency, high precision and high finish superiority in the mold cavity processing, it has become a standard configuration equipment in mould manufacturing enterprise.In high speed processing, it often meets with corner. There are three form of the corner:the intersection between two straight lines, the intersection between lines and circular arc and the intersection between two circular arcs. As cutting at corner, cutting speed and direction changes, the meshing Angle and cutting force increases and the part quality goes to worse. The traditional CAM software do not solve the problems at corner, which limits the development of high-speed machining technology.In this paper, corner milling is studied mainly in three aspects.First in this paper, we conduct a series of corner processing single factor experiment to obtain the relations between the process parameters and cutting force, cutting vibration. We get the following conclusion:①In high speed milling at corner, cutting force increases as the feed speed,axial cutting depth and radial cutting depth increase. With the increase of spindle speed,cutting force has slow down. And the cutting force reduce as the corner increase.②As the spindle speed increase, the process vibration fluctuate and get the maximum when spindle speed is20000r/min.then with the orthogonal experiment method analysis, we get the following conclusion:①axial cutting depth and the speed is the effect of the main factors of cutting force corner, spindle speed and radial cutting depth on the corner of cutting force the secondary factors.②Comprehensive process parameters at15°45°and75°has been obtained by analysis of variance.③Corner cutting force prediction model is established using multiple linear regression method and the predictive values match well with the experiment values.At the last, tool path is optimized at corner in high speed milling. we get the following conclusion:①Traditional transition arc is optimized to avoid the sharp increase of radial cutting depth at corner.②Circular circle cycloid model is introduced to the corner milling, and the algorithm to limit the radial cutting depth is proposed.③The contrast experiment shows using the optimized tool path can get better process quality and smaller cutting force than using CAM software Cimatron.