Flatness error measurement method based on line structured light vision

Flatness is an important shape deviation. A flatness error measurement method was proposed based on line structured light vision technology for flatness measurement in the field of mechanical component manufacturing and processing. Firstly，the images of light strips were collected，and the spatial coordinates of the scanning points were obtained by the corresponding light plane equation for each position. Secondly，the evaluation methods for flatness errors in national standards was analyzed and a measurement algorithm for flatness errors was established based on geometric constraints. Finally，through the proposed method，the evaluation base plane and flatness errors were calculated using the spatial coordinates of the scanning points. In the experiment，the positioning surfaces of the insert molds are selected as the measured planes，and the measurement results obtained by visual measurement are compared with those obtained by the contact measurement method. The measurement error is less than 20 μm. The experimental results show that the measurement method proposed is feasible and improves the measurement efficiency of flatness error. © 2023 Editorial Board of Jilin University. All rights reserved.