| Machining of punching and shearing gets wide application for its high quality,low cost and easy access to mass production. Nowadays, as one of the advanced manufacture technology for punching and shearing, turret punch press, which integrates the thoughts of flexible manufacturing unit, develops more rapidly than ever before. But the key technology core of turret punch press- CNC system still depends on import from other developed countries, so the study on CNC system of turret punch press is important significant. According to the thought of open numerical control system technology, based on the technology of PC and movement control card, this paper analyses the technical process and the machining characteristic of turret punch press punching a sheet of workpiece, develops and designs the core of turret punch press -CNC system, and designs the main peripheral control circuits. The contents of this paper are as follows:1. According to the thought of open numerical control system, the paper analyses and introduces the main constitution of the recent numerical control system ,and confirms the main frame of numerical control system we used, explains the control principle of the movement servo system in detail which is the key technology of numerical control system.2. Aiming at some of the problems in the G-code software modules created by the geometrical information obtained from the DXF files, some optimization work is done to strengthen the function of the software, which is able to capture the complex graphic units for generating the G-code, make the cutting location (CL) optimization more convenient, and strengthen the management on the die database of software.3. The paper analyses the working characteristics of turret punch press, designs the main peripheral circuit of the control system, which mainly includes the design of the operational panel, pneumatic control units, and other current about input and output devices. 4. Based on the general G-code standard and the other criterions used in the foreign well-established factories, the paper designs the particular G-codes used in developed CNC system. A control software of CNC system is developed based on the platform Windows xp system and Visual Basic. By using the modularized technology, the software is capable to complete the work of testing the G-code,displaying the real-time graphics and machining with many kinds of process, which facilitate the software's development, update and maintenance.5. With the Googol motion control platform, an experimental platform is built in term of the CNC system project as designed, with the functions to test the system and corrects defects of the system. |
