| Cavity parts are widely used in aerospace, automobile, mould and othermanufacturing industries. However, under the traditional conditions, cavity parts havelow processing efficiency and quality because of their complex structure and preciserequirements. High-speed milling technology provides a new solution for theprocessing of cavity parts. When high-speed milling technology is applied in cavityparts processing, it needs some conditions, such as high speed milling machine toolsand cutting tools. What’s more, smooth and continuous, stable cutting tool path ofhigh-speed milling is very important. Ring tool path is not smooth in the transition ofdirection and appears arc and linear continuous connection in the arc transition, sonew transition methods are put forward; those are Clothed curve transition andB-spline curve transition. These transition methods studied optimization strategiesabout successive high speed milling cavity and smooth milling force. Results indicatethat tool track of Clothed curve transition and B-spline curve transition are smoothand continuous, which are suitable for requirements of high-speed processingFirstly, the paper introduces the research situation of the tool path of high-speedmilling cavity. The research situation include the tool path’s generation, connection,high-speed milling machining passes and mainly describes the transition ways ofhigh-speed milling cavity.Secondly, it emphatically elaborates cavity path’s optimization of high-speedmilling. High-speed milling cavity tool and network optimization theory havecommon features in Dijkstra algorithm. Using Dijkstra algorithm in cutting tooltrack’s connection, it will derivate tool track algorithm of high speed millingprocessing. This algorithm will solve the problems about track interference in thecutting tool track’s generation and self-processing processing of profile, then realizehigh speed milling cavity.Then, the paper introduces the existing CAM belt-loop transitions at home andabroad: normal transition and general arc transition. For normal transition betweenrings, the tool path of rings is not continuous. In the transition process, the millingforce of cutting tools suddenly increases; it will affect the quality of high-speedmilling parts. What is worse, it will cause collapse of the cutter when serious faultsappear. For arc transition, when the transition arc radius is more than half of themultiple distance, the one end of the circular arc directly intersect with tool path, another end is a line segment connection, multiple tool path is discontinuous.According to the shortages of ring transition and the requirements of high-speedmilling, the Clothed curves and B-spline curve transitions between the rings are putforward.Finally, the article establishes mathematical models about high-speed millingnormal transition, larger arc transition, Clothed curve transition, and B-spline curvetransition; meanwhile, it has a test in the simulation and experiment. Through thesimulation of high-speed milling tool path, testing of milling force, analysis of surfaceroughness’ characteristics, it verifies that the Clothed curve transition and B-spinecurve methods are better than the circular arc transition and transition-to-transitionmethod. Clothed curve transition and B-spine curve methods will realize the smoothconnection in cutting tool’s path, which are suitable for high-speed milling’srequirements. |
