论文部分内容阅读
精度设计是机床误差避免技术的重要手段，涉及在工作空间中给定刀具的最大位姿允差后，合理地制定零部件制造公差及装配工艺的问题。以３—ＨＳＳ型并联机床为对象，利用空间矢量链模型建立零部件制造误差与动平台位姿误差的映射关系。给定零部件制造公差后，利用该模型即可预估出动平台的位姿误差。在此基础上，根据灵敏度分析结果，提出一种在给定刀具位姿允差条件下，以零部件制造公差加权欧氏范数最大为目标，以角性公差和线性公差在同一精度等级下达到均衡为约束条件的精度设计方法。研究成果已成功地应用于一台并联机床样机的开发。
Accuracy design is an important tool of machine error avoidance technology, involving the maximum position and orientation tolerance of a given tool in the work space, the reasonable formulation of parts manufacturing tolerances and assembly process problems. Taking the 3-HSS parallel machine tool as an example, the space vector chain model is used to establish the mapping relationship between the component manufacturing errors and the pose error of the moving platform. Given the manufacturing tolerances of components, the model can be used to predict the pose error of the moving platform. On the basis of this, based on the results of sensitivity analysis, aiming at the maximum tolerance of the component manufacturing Euclidean norm under the condition of allowable tool pose and pose tolerance, aiming at the maximum of angular tolerance and linear tolerance under the same accuracy grade Achieve the equilibrium as the constraint of precision design method. The research results have been successfully applied to the development of a parallel machine tool prototype.