The Study On Precision Control In Milling Process Based On Computer Simulation Technology

NC milling machining is of importance in the machining process. Milling has the feature of multi-edge interrupted cutting and alter-thickness machining. With the development of modern manufacture technology and new material , cutting-tools, process and new equipment, it is necessary to research NC milling physical simulation furthermore.Cutting force simulation is not only an important part of physical simulation in milling process, but also the foundation of vibration prediction and surface topography estimate. The model of milling force can optimize the machining parameters in milling process. So the model of milling force can directly influence the milling efficiency and quality. This article focuses on the model of cutting force in milling physical simulation. Firstly, the local milling force model of ball end cutter element is established with consider of the influence factors. Then, integral the model along cutting edge, and gain the whole milling force with adding all the force each tooth endured. At last, simulation was taken to exam the model. The result shows that the model is efficient and reasonable, it can correctly reflect the relation between milling force and the parameters.Besides, Simulating machined surface topography is very critical since it affects the surface quality directly, especially the surface roughness. In addition to this, simulation results will be used as basic data when process parameters are optimized. In this article, firstly we formulate the parametric equation of the cutting edge, whose trajectory equation relative to the workpiece is then generated through a series of coordinate transformations. Based on the trajectory equation and the geometrical characteristics of the milling process, a new method is developed for the prediction of the topography of the generated surface. Concretely, the surface topography of end milling processes is simulated successfully by this method. Numerical results indicate that the algorithm is general, efficient and of high precision.