Research On Tool Path Planning Technology Of Five-axis NC Machining Of Fillet-end Cutter

Made in China 2025 makes the industry more and more demanding for automation.Ordinary three-axis CNC machine tools can not meet the processing requirements and precision of complex curved surfaces in aerospace,mold and other fields,while five-axis CNC machine tools are increased compared to ordinary three-axis machine tools.Two rotating shafts enable the cutter shaft to continuously adjust the posture of the machining according to the curvature change of the complex curved surface,so that the complex curved surface can be processed more effectively in the five-axis CNC machine tool manufacturing industry such as aerospace,automobile parts and molds.It has gradually replaced the three-axis CNC machine tool.Path planning is one of the key technologies in five-axis CNC machining,which affects the machining efficiency and machining accuracy of the parts.At present,domestic and foreign scholars have done a lot of research on this,but most of these studies are directed at the processing of flat-bottom knives and ball-end milling cutters.There are few involved in the circular milling cutters,and there are few reports on the tool path research on the five-axis machining of circular milling cutters..As an effective non-ball head milling cutter,the ring milling cutter has the advantages of high machining efficiency and good machining quality,so it has a good application prospect in complex surface machining.In order to improve the machining efficiency and machining accuracy,this paper studies the tool path planning of the five-axis NC machining of the ring milling cutter,and establishes the most reasonable tool path without interference.The main research contents and innovations of the thesis are as follows:1.Improved the traditional equal-curve high-step interpolation algorithm.By using the method of this paper,the number of knife contacts can be minimized under the condition of satisfying the bow height,between each two knife contacts.The bow height is checked so that each position meets the bow height requirement,which not only improves the processing efficiency,but also reduces the surface roughness.2.An equal residual height tool path planning technique based on envelope surface method is established.On the basis of the traditional equal residual height method,the corresponding two tool contacts on the two adjacent tool paths are calculated.The characteristic line,the residual height point is obtained by the intersection of the two characteristic lines,and then the actual residual height is obtained according to the shortest distance from the point to the surface,and the line spacing between the adjacent two tool paths is satisfied when the given residual height is satisfied.Maximum to improve processing efficiency.3.In order to verify the correctness of the above tool path planning technology,the generated tool path data file needs to be simulated and processed in VERICUT.For this reason,the post processing technology is studied.Firstly,the transformation relationship between the work piece coordinate system and the machine coordinate system is established.Then the tool position file is converted into the NC code that the machine tool can recognize by coordinate transformation.The feasibility and efficiency of the path planning are verified by VERICUT.