Research On NC Machining Technology Of Free-Surface Based On Simulated Annealing Genetic Algorithm

With the vigorous development of modern industry,complex curved surfaces are widely used in both heavy and light industries,such as aerodynamically required aircraft shapes,body skins,fluid dynamics turbine blades,and exquisite and beautiful electronic product shells,etc.As the shapes of these products become more and more complex,the process of processing these products with complex curved shapes also becomes complicated.Therefore,how to improve the processing accuracy of complex surface products has become a major problem faced by hardware engineers,and the CNC machining technology of free-form surfaces is one of the key technologies for modern industrial design and production.Since the beginning of the new century,due to the development of industrial technology and stricter quality standards for products with complex shapes,modern industries urgently need advanced free-form surface numerical control processing technology,and a large number of engineers have launched research on this.Free-form surface CNC machining technology includes free-form surface modeling technology,tool path trajectory planning technology,CNC programming technology,etc,of which free-form surface modeling technology is the foundation,free-form surface tool path trajectory planning technology is a key link that affects the effect of free-form surface CNC machining,CNC programming Technology is an indispensable technology for CNC machining.This paper studies the current research status of free-form surface CNC machining technology at home and abroad.Based on NURBS surface modeling,in order to improve the processing efficiency of free-form surface,the free-form surface CNC machining technology is deeply studied,and the problem of finding the shortest tool path is converted into TSP.To optimize the traveling salesman problem,it is proposed to use the simulated annealing genetic algorithm to plan the tool path trajectory,and to program the planned tool path trajectory in the UG software to generate a numerical control program that can be used for actual machining.By simulation and experimental processing machining,the method proposed in this paper is compared with the traditional method of machining free-surface.The maximum optimization distance of cutting path length is 303.4 mm,which is relatively shortened by 12.3%,the minimum optimization distance is 179.6mm,Relatively shortened by 7.7%.And measure the processing surface of the optimization method and the traditional method model.The maximum deviation value of the processing surface of the optimization method is 0.457 mm,the residual amount is less,and there is no overcutting.The maximum deviation value of the processing surface of the tradi-tional method is 0.552 mm,and the residual amount is large.Overcutting occurs.The optimization method is at the maximum residual Both height and residual amount are smaller than traditional methods,and the optimization effect is good.It provides a new idea and method for free-surface machining.