Study Of The Automatic Graphic Programming System For NC Lathe

With the Wide application of Computer in manufacturing, the NC machining Auto programming, which is an important component of Computer-Aided Design and Computer-Aided Manufacturing (CAD/CAM), has been the key technology to improve the productivity and create more economic benefits in modem manufacturing.AutoCAD drawing software is the most widely used in the fields of mechanical design and manufacture. At the present, the part drawing in factories is mostly in form of AutoCAD file, the research on NC platform of drawing auto programming makes NC system access AutoCAD. Two dimension drawing information, simplifies NC programming, relieves NC programming persons of heavy work in information extract, organization and input, avoid making mistakes, increases NC system reliability and production efficiency.Extracting the part geometry parameters and technological parameters directly from the graphic database of CAD system is a method for integration of CAD/CAPP/CAM systems. Under the environment of AutoCAD, by using the method of moduled design, a NC graphic programming system is developed. In terms of drawing or inputting graph, getting related information graph preprocessing, technology interference, post processing, producing and checking NC program, the paper introduces the construction, function, principle and work modes in detail and shows the superiority of CAD/CAM technology.The method of reading the line, arc, spine, tolerances, surface roughness and full messages of the part from DXF file generated by AutoCAD is mainly introduced. Based on the study of DXF, a program interface is developed, by which the data can be shared among different CAD systems. According to the different Characters, the respective tool paths are designed. And by a machine configure file, the General postposition process is deal with. On the research of thegeneral simulation technology that is based on the NC codes. By analyzing the characteristics of the CNC system and the NC codes, a set of general simulation interface is developed.Last, under the direction of software engineering, we design and come true the automatic programming system adopting object oriented method. Consequently, it works stably and improves efficiency of Auto NC code in use of emulation system.