Optimization Of Tool Position And Orientation In Five-axis CNC Machining Of Complex Surfaces

With the combination of curved surface, two side manifold surface complex curved surface is widely used, while the existing commercial CAM software cannot satisfy five axis NC machining accuracy problems are gradually revealed. For this kind of complex curved surface for five axis NC machining according to its surface characteristics and process requirements of the specific analysis and research. This paper studied the machined surface and the cutter contact track of tool position and attitude parameters of the relationship between research, and set up three kinds of cutter axis vector optimization model, explored the method to solve the model; developed based on adjacent cutter contact between the theory of curved surface contour of nonlinear error control strategy.First, analysis of the complex surface geometry characteristics, study of rigid tool and surface local differential geometry, using a cutting plane method to get the surface contour, and according to the maximum allowable error range calculation tool step, to determine the cutter contact sequence. Using ACIS surface-to-surface intersection technology to build tool interference detection method, combined with knife contact information to establish the initial curvature of the tool orientation customization method; against the adjacent the tool orientation variation can not meet the movement of the machine tool spindle speed limit, put forward and backward diffusion, beyond the amount along the tool orientation optimization method.Secondly, the tool orientation feasible region planning the tool orientation sequence of ideas to make thorough research. Adjacent to the tool orientation variation as established weight of tool axis vector graph, and using Dijkstra algorithm to calculate the tool orientation change global minimum the tool orientation sequence; study in linear equation as the boundary constraint the tool orientation feasible domain, built with the rotary axis of the machine tool kinematics performance optimization for multi-objective optimization model, and the constrained optimization method for solving the model calculation.Finally, according to the different tool appearance characteristics were described for the cutter location calculation method, and the nonlinear error are analyzed, and the tool axis vector calculated theoretical contour line midpoint of cutter contact way in the convex part interpolation compensation of nonlinear error, to ensure the machining accuracy requirements.