Study On Improvement Of Revolving Part’s Internal Surface Measurement System

Revolving part is important in industrial production, especially in defence andhigh-tech fields. And higher and higher demands are proposed to measurementprecision of revolving part’s inner and outer surface in now society.According to practical condition that random error is oversize and repeatability ispoor of inner surface measurement system, introduced the real-time errorcompensation method. The scheme mainly uses optoelectronic autocollimation tomeasure pitching angle error, and realizes real-time error compensation with it. Anddraw the machining drawing for the future work.The paper analysed the mechanical design deficiency of original rotatormeasuring machine(RMM), and designed the whole inner surface measurementsystem according to the original design. Including selecting the performance of probe,probe head and grating system, choosing proper model of ball screw and air cushionblock, and designing the non-rigid connection system of vertical motion. The verticalsystem used center drive structure instead of lifting wire structure; the horizontalmotion system cancelled balance mechanism and used a precision displacementplatform which is ready-made production, and greatly improves the system’s stabilityand stiffness. At last, established the error compensation model for the new innersurface measurement system, and laid certain foundation for the future work.To prevent the collision problems of non-contact probe and workpiece during theprocess of measurement, a virtual three-dimensional movement simulation model ofRMM for real-time monitoring with OpenGL was built. At the same time, ananti-collision algorithm which is based on shortest effective distance of point andsurface in simulation environment was proposed. The algorithm is applied to a virtualRMM system as a critical means to prevent the collision of the measuring head andthe workpiece. Experiments showed that the minimum distance between test point andworkpiece’s inner surface is in allowing error range, and the software can alarm intime before collision and stop the current measurement. It can avoid collisions of theprobe and the workpiece effectively. The algorithm is simple and fast, and hassignificance usage in practical work.