Error Analysis and Compensation for Slice Component Precision Assembly
WANG Tao 1 , LUO Yi 1,2, WANG Xiaodong 1,2, LI Yawei1
(1. Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian 116024, China; 2. Key Laboratory for Precision and Non-traditional Machining Technology of Ministry of Education, Dalian University of Technology, Dalian 116024, China)
Abstract：Automatic alignment and assembly of slice components is widely used in precision fabrication of aviation components. In order to meet the requirements of positioning accuracy, an automatic assembly system based on machine vision is developed to realize the coaxial assembly between the slice component and the base. Firstly, the camera’s pixel is calibrated to improve the accuracy of machine vision calculation; then the angler error of the linear guidance in the visual measurement module and assembly operation module is measured, the compensation algorithm is established to eliminate the influence of the angler error; The images of the slice component and the top circular on base are larger than the camera’s field of view, thus the images should be mosaic before getting the key characteristic. The angler error also should be incorporated in the mosaic. Finally, aiming at the random error caused by adhesion when the sheet assembly is released, a rigid adsorption head is designed to reduce the error. With the above error compensation methods, the assembly coaxiality of the slice component is reduced from 292.4μm to 19.6μm.
2020, 
