Physical Modeling And Simulation Of Numerical Control Milling Processing

As the rapid development of science and technology and the growing diversity of production needs, NC machining simulation technology becomes an indispensable and important part of the modern manufacturing technology research. Physical simulation of NC milling machining is a complicated research subject, including plenty of foundations, theory and experiments to study. It must solve in order to develop further in NC machining technology. Physical modeling and simulation research of NC milling machining has an important meaning for improving machining efficiency and machining quality of workpiece.This paper builds milling force model, surface roughness model and processing precision model in milling machining based on research in milling of physical simulation. Based on analyzing the elemental cutting force relation between the instantaneous radial chip thickness and cutting edge length, it builds the dynamic milling force of ball-end mill at arbitrary feed direction, and proposes the milling force parameter model based on principal components analysis method to identify parameters. The surface roughness model is built by multiple regression analysis based on analyzing influencing factors to surface roughness. The model is validated higher prediction precision, more universal, is helpful to realize quality of the machined surface changing with milling parameter, and offer warranty for selection of cutting parameter and control of surface quality. Considering the influence of the cutting tool stress distorts, cutting tool being heated distorts, the workpiece being heated distortion and the cutting tool wears to processing precision, we respective mathematical model to forecast the processing error , through vector addition in error sensitivity direction respective factor. Finally, the physical simulation of NC milling machining software based on hybrid model is developed, and the interface and function are introduced, and the software is checked to be true and credible. The dissertation insists on integrating theory research with experiment research, not only establishes the theory model, but also does plenty of NC machining experiments including, and validates model credibility. To select reasonable parameter and predict processing quality, it provides evidences, reduce cost, increase production efficiency,and processing precision.