Research On Optimization Of NC Machining Cutting Parameters

Technology of NC machining is the base and key of modern automatic, flexible and numeric machining technology. It is an important research subject in modern mechanical industry to improve the efficiency of numerical control process. The intent of this article is to present the way to improve productivity and reduce productive cost by setting up optimization system to achieve reasonable machining parameters.In process of NC machining, especially in process of machining complex surfaces, the cutting conditions can change. However, cutting parameters are still chosen artificially and remain unchanged in present process of NC machining, which causes the decrease of NC machine productivity.According to the optimization of NC parameters of complex parts with great change in NC manufacturing, the method to discrete simulation is used in this paper. Shape of the work piece is subdivided into uniform meshes and the depth of each cell being machined by the milling cutter is calculated. The cutting depth of the cutter in corresponding cutter spacing is figured out with the cutter spacing files. Then the process route is dispersed with the change of the cutting depth, and each process route segment is optimized according to steady parameters method. The continuous varying parameter optimization problem is transformed to discrete multi-parameter optimization problem and the corresponding model is constructed. Then the multi-parameter optimization problem is rapidly solved by decomposing it to many sub-problems. At last the math optimized model is established, and the optimized program is compiled which is operated in PC in order to determine the best cutting parameters in this route. In the machining process of the part there are several such routes, so the globally optimized parameters can be achieved by optimizing each route.In this paper, the optimization of varying machining parameters for NC cutting operations is discussed. It can improve the efficiency effectively. Using the method a great deal of technologists could be released from the repeated handwork, and rationalization andstandardization of cutting parameters will be realized, productivity of the machining center can be improved and well economy benefits should be obtained consequently.