Research On Geometric Simulation And Feed Rate Optimization For Planar Profile CNC Milling

CNC machines can manufacture complex shape and high-precise parts, and most parts with complex shape are currently machined with CNC machine tools. CNC machining has been widely used in the aeronautical, automotive, and die and mould industries. In CNC machining of these sculptured parts, optimal machining parameters-spindle speed, feed rate, and depth of cut-planned can promote the machining efficiency significantly, and the optimization technology of machining parameters has been a pop research topic for decades. Since the feed rate of CNC machining influence part machining time, part profile quality and tool life, techniques of feed rate optimization are in high demand in manufacturing industry.In the conventional approach, the feed rate is not optimal in terms of the machining condition at every cutter location, and it is fixed at a conservative value causing longer machining time or shorter tool life.This paper focuses on the research about the feed rate optimization technology for the planar profile milling and involves the stock-remaining model building, geometric simulation of the tool path in finishing milling and the feed rate optimization base on the geometric simulation.First, in the process of building simulation model, cutter location point of the NC file is chose as the geometry data source, which enhances the efficiency of modeling. And the relation of tool path's geometry and material removal rate is analyzed based on the geometry simulation of the numerical control machining process.Then, based on the geometric simulation technology, an algorithm for feed rate optimizing which keeps the MRR constant is put forward. Aiming at conquering the shortage in choosing feed rate, this algorithm can optimize the feed rate correctly and promote the efficiency, and it doesn't need to experiment frequently to get the optimizational parameters.Finally, the approach is applied on an example part for profile milling, and the results prove the advantage of this approach.The paper presents a systematic technology of feed rate optimization on CNC planar profile milling based on geometric simulation of tool path which is the base of intelligent CNC programming.