车削加工物理仿真实现技术

摘要

A synthesizing method is developed to establish a mathematical model for describing the machining tolerance which synthesizes both the geometric and physical tolerance. The‘contact point’method in turning is presented which is similar to the physical simulation of other sorts of machine tools. According to the direction of error sensitivity, three-dimension errors are reduced to two-dimension ones. FEM is used to calculate precisely the elastic deflection error of the system under the condition that the size and shape of workpiece varies continuously and dynamically. The model of error synthesis can be applied not only to the analysis and control of the machining tolerance but also to real-time error compensation for CNC.%提出误差集聚法，可建立多误差因素共同作用下的切削加工数学模型，使之纳入机床加工过程的几何与物理误差。提出车削加工切点法，可应用于其它类型机床的切削加工物理仿真。根据误差敏感方向，将三维误差简化为二维平面误差。在车削加工工件尺寸及形状皆连续动态变化时，应用有限元方法准确计算出工艺系统因弹性变形所引起的误差。给出的误差综合模型，既适合车削加工误差的分析与控制，也适合数控加工误差的实时补偿。