Research On The Inspection Method Of The Ball Surface Defects And Its Key Technology

The surface defects of the bearing balls strongly affect the quality and performance of bearings.The bearing ball qualities directly affect the life span,the precision and motion performance of bearings.Therefore,it is vital to inspect the ball surface defects of bearing balls.Traditional inspection methods can hardly meet the demand of high end bearings due to their low efficiency,and high labor intensity.There is an urgent need for establishing an automatic inspection device for bearing balls with high precision and high efficiency.Optical inspection,owing to its intrinsic high sensibility and accuracy,is an ideal high inspection method.Based on these aspects,the experiment platform which is applicable to non-contact inspection of micro defects on spherical is built and presented in this paper.The main work is as follows:(1)Based on laser scattering and shear interference,the optical system which is applicable to inspect micro defects on spherical bearing balls is designed.The mechanical structure and photoelectric signal acquisition system are designed and built.The experiments on a calibration board indicates that the detectability of the optical system can reach 4 microns.(2)The difference between meridian unfolding and spiral unfolding is analyzed.Base on this analysis,the condition of spherical spiral unfolding is studied.And the sphere unfolded mechanism and the driving system are designed.The platform of sphere unfolded mechanism is built and described in this paper.(3)Based on the analysis of sphere unfolded kinematics,the simulation model is established.The inspection trajectory for sphere is simulated using ADAMS.The influences of the angular velocity of precession and rotation on the trajectory is studied by setting different simulation parameters.The simulation results indicate that the optimal angular velocity is that the angular velocity covers 180° during the simulation time.(4)Based on the above studies,the control part of the inspection platform and the software system interface are designed and developed.The entire inspection platform is built and described in this paper.The related experiments are carried out on the platform.The experimental results indicate that the optical inspection for spherical surface based on shearing interference can effectively inspect the defects on the surface of micron.The laser scattering inspection technology which in the same optical path with shearing interference can also effectively inspect the defects on the surface which has strong scattering effect.The combination of these two technologies can effectively inspect the micro defects on the surface of high end bearing balls.The experiments reveal that the unfolding mechanism which based on the structure of primary and passive wheel and live spindle can realize full cover of spiral line of the spherical surface.And the interval between spiral lines can be controlled by adjusting the speed of primary and passive wheel and live spindle.The inspection platform for defects inspection on bearing ball surface is designed,built,and described in this paper.The platform can effectively inspect micro defects on the precision bearing balls,which solved the problems of manual inspection and increased the efficiency and accuracy for defect inspection.This inspection platform can reduce labor cost and offer manufactures with an effective inspection method for precision bearing balls which in turns,ensures the quality control for precision bearing ball manufacturing.