Research And Implementation Of The Simulation System Of Three-Axis Numerical Control Milling Machining

With the development of advanced manufacturing technologies, precision numerical control (NC) machine tools because of high production efficiency and the processing characteristics of complex shapes are widely used in a wide range of application fields, such as aerospace parts, vehicles, equipment, shipbuilding, etc. However, there will be some mistakes in actual NC machining codes because there are usually errors in practical NC code files. These problems often lead to the failure of NC machining. Therefore, verifying accuracy of NC codes before the formal NC machining process is a very important component of actual procedure in production. Traditionally, the easy and available method of verification of NC codes inclines to use cheaper materials processing machining test, but in practice, there are deficiencies of this method without doubt that is time-consuming and not really match for modern high-speed, high-efficiency, individual production requirements. For this reason, it has been looking at all ways of the certification test which can be applied to replace test-cutting. With computer technology at the core of the rapid development of information technology, computer graphics technology and its powerful computing power is gradually used to achieve simulation of the actual NC machining processing and evaluate machining precision of parts in quantitation. Therefore, virtual NC machining technology provides a powerful tool for verifying the reliability of the machining processing forecast with result of avoidance to all deficiencies of the test-cutting, and consequently plays a very important role in promoting the development and application of this technology.Due to the great significance and practical value of NC machining simulation, this thesis preliminarily studies the overall framework of NC simulation, adopts object-oriented programming techniques to develop all of functional modules under these circumstances of MFC framework and OpenGL, discusses properties of STL model and the NC code, ,focuses on the composition and characteristics of the NC code, and presents a method of dynamic simulation of the tool path based on OpenGL, which the parts can be translated, zoomed, rotated, paused and observed from multi-orientation. Besides, the STL model is introduced in the paper used as a data model of processing object. On this basis of calculation of the minimum distance between the surface of the workpiece and cutting position, the result of comparing the minimum distance with the tool's radius is finally left to determine whether there will be any interference between the tool and workpiece. On this basis above, a simulation system of three-axis numerical-control milling maching processing is successfully developed in the end. As a result, it is a possibility to an great extent that evaluation of NC machining processing is effectively achieved under a virtual processing circumstances without real NC machines, and an favourable foundation is laid for futher research on this issue.