机床主轴回转加工精度优化控制仿真

摘要

This paper focuses on a non-contact control model of machining accuracy rotation of machining tool spindle.Firstly,the above model used small displacement spinor method to obtain constraint location relation among components and built directed graph model of spindle,then filtered error accumulation path and key tolerance.Moreover,our research associated with key tolerance on error accumulation path to extract geometry features of machine tool spindle and calculated probability density distribution function of error space coordinate transform among spindle components in transformed coordinate system,finally extracted geometric features of spindle rotation of machine tool.On this basis,we built control model of machining accuracy for rotation of machining tool spindle.Simulation result shows that the proposed model can effectively calculate the geometric rotation error of precision spindle.%对机床主轴回转加工精度的优化控制,能够有效提高机床工作效率.对机床主轴回转加工精度的控制,需要计算出主轴零件之间误差空间概率密度分布函数,提取机床主轴回转几何特征,完成回转加工精度的控制.传统方法利用双测头误差分离法计算出主轴圆度误差,计算出实际主轴轴心轨迹,但忽略了提取主轴回转几何特征,导致控制精度偏低.提出基于非接触式的机床主轴回转加工精度控制模型.上述模型先利用小位移旋量方法获取零部件之间的约束定位关系,组建主轴的有向图模型,筛选出误差累积路径及关键公差,将误差累积路径上的关键公差相联系,提取机床主轴几何特征,计算出变换坐标系中主轴零件之间误差空间概率密度分布函数,提取机床主轴回转几何特征,以此为依据组建机床主轴回转加工精度控制模型.实验结果表明,所提模型可以有效计算精密主轴的几何回转误差.