Research Of Anti-collision System Of Numerical Control Lathe And Measuring Equipment

The numerical control (NC)lathe is controlled by NC program, which is written by hand, or generated by the software automatically. It contains the mistake unavoidably, will cause the damage of the cutter or equipment accident, and must be verified before coming into use. At present, the major methods of verifying NC programs are'Trial Cut'and'Cutter Orbit Emulation'.'Trial Cut'method costs high and has a long cycle, so it doesn't meet the needs of economic production.'Cutter Orbit Emulation'method doesn't consider machines condition. Therefore the three-dimension dynamic simulation of NC lathe processing is an important research direction.In the recognition system of part location of intellectual coordinate measurement machine(CMM), in order to make the virtual part's position accord with the real one's, the position and direction of the real part must be gotten to set up an accurate coordinate system. To get the center point and direction of a part, please refer to Zhao Jincai's Doctor Thesis. This article focuses on obtaining the coordinate of angular points for accurate part localization.The following work has being done in this thesis:1. Put forward the whole frame of the anti-collision system of the NC lathe, and develop error checking and correcting module to do grammar checking and colliding detecting, it is proved by experiments to be able to cover the basic requirements.2. Adopt traditional Tsai non-coplanar calibration algorithm to calibrate camera set on the CMM. The scheme of gathering calibration data is designed utilizing accurate movement of the CMM and the good optics characteristic of white standard ball. By developing data collecting and calibrating programs, the whole process is made automated, simple and precise, which can be done within few minutes.3. Detect angular points in the parts'images with standard Hough algorithm and least square method,and calculate the Z coordinate of upper surface of part with the angular points .The algorithm has high accuracy and stability.