Research On Precision NC Grinding Machine Measurement And Simulation Experiment Technology

Precision grinding is the main method to determine the workpiece's form accuracy, roughness and surface quality. It can obtain high accuracy and glabrous surface. Precision NC grinding machine, which has the characteristics of high machining accuracy, high machining efficiency and wide machining range, is attracting more and more attentions in many countries. On-line measuring technology integrates machining with measuring, realizes auto measuring in machining process. It reduces measurement time sharply, and avoids repetitive position error, and improves machining accuracy and stability of precision.The combination of computer simulation technology and NC technology has produced virtual NC machining simulation technology. Checking NC machining code before actual machining can prevent the incidence of collision and interference. The virtual NC machining simulation technology can simulate cutting tool, workpiece, machining environment, machining path and material removal process. It can also eliminate the problems of cutting toll, fixture, and workpiece damage which is caused by NC program mistakes. It can improve machining efficiency and economic benefit greatly, especially for high precision machining.This project regards on-line measurement system of precision NC grinding machine and NC machining simulation technology as the main content. The main work can be described as follows:1. On-line measurement system of MGK7160 high precision NC grinding machine is built by using of grinder bed, CNC system, laser sensor, and IPC. Measurement system software is developed. Different measurement paths are designed and realized. It can implement data collecting and data process, and then the true surface shape can be obtained and can be used for compensation machining.2. The cause of measuring system errors are analyzed, reasonable methods of data process are proposed. The measuring data is pre-processed by singularity points deleting and data smoothing. Through error separation and revision experiments, the system errors are separated, and the results indicate that the method is reliable and precise.3. On the platform of Visual C++ and OpenGL, A virtual NC machining system, which can realize all processes from the establishment of NC procedure to grinding machining simulation, is developed. The simulation system has the function of collision detection. When collision and interference takes place, it will report error and tell us where the place of interference is, so as to reconsider or modify the machining parameters and NC program.