Inspection System On CNC Machine Center

With the development of national manufacturing machining industry, the studying about the numerical control machine tool with on machine inspection function has been given attention by related researchers. Relatively to some developed countries the corresponding achievements in this filed lag behind. This essay discusses the inspection on machine center and obviously it will promote the study of inspection on other machine tools.Firstly, for improving repeatability of the machine center, which is taken as a test bed, the linear positioning error and angular positioning error of each axis are inspected by the laser interferometer. Also, pitch compensation and backlash compensation are implemented.To accomplish on machine inspection for the numerical control machine center, an inspection system with touch sensor and laser vision sensor is used to obtain edge and 3D surface information of the work piece rapidly. From the test bed, some research results are obtained as follows:1. Calibration approaches for touch probe and laser vision sensor are given.2. A scanning path planning for getting edge information is designed.3. A scanning path planning for getting 3D surface point cloud data is developed.4. The non-touch laser 3D scanning is done continuously.5. The touch and non-touch inspection are done successively.The software of the system above is designed. The software in the computer can receive and send data files (G-code and parameter files) from and to machine center. The software can control the laser vision sensor through wireless network. The software can obtain, display and save work piece information. Some classes are written, such as G-code generating class fitting for FANUC NC system, path management class to regulate both touch measurement and vision measurement routes.Many experiments are done. The effectiveness of the presented scheme is demonstrated by the experimental results. The precision of the presented system is so high that the error of touch measurement is less than 40μm and that of vision measurement is less than 60μm.