关键词: 大尺寸轴对称非球面, 刚体运动学, 光栅式平行磨削, 精度建模, 面形精度

Abstract: The general error model of high precision surface grinder is presented by using rigid body kinematics theory and coordinate transformation. To meet the machining requirement of large axisymmetry aspheric lens, the grating parallel grinding method is adopted. Considering high precision surface grinder structure and the main error factors affect the machining accuracy of large aspheric, a large axisymmetric aspheric error model is proposed, which can be used to predict surface accuracy and compensation grinding. The main error factors are discussed and it is shown that the straightness error, positioning error and arc radii error are main errors that effect surface error distribution, meanwhile, surface error value is the mixed result of each individual error. The experiments are carried out and in agreement with the theoretical results. The grinding experiment shows that the model can well predict surface accuracy and surface accuracy is improved after compensation grinding

Key words: Grating parallel grinding, Large axisymmetry aspheric, Precision model, Rigid body kinematics, Surface accuracy