Precision modeling and prediction of precise vertical machining center based on theory of multi-body system
Precision modeling and prediction of precise vertical machining center based on theory of multi-body system
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发表时间：
2012
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通讯作者：
Cai Ligang
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作者：
Cai Ligang
为了预测机床的加工精度，验证其设计思想，对某精密立式加工中心进行了几何误差分析，基于多体系统理论，建立了多体系统精度预报模型，用拓扑结构和低阶体阵列描述了多体系统之间的相关性，给出了多体系统之间的坐标变换关系，并给出了多体系统精度预报模型。基于齐次变换矩阵描述了多体系统中任意两个相邻物体之间的运动，推导了多体系统中任意两个相邻物体之间运动的特征矩阵和相对运动方程，建立了精密立式加工中心的精度预测模型，在对典型工件进行仿真加工的基础上，结果表明，所提出的精度模型能够有效、抽象地描述立式加工中心的系统结构，合理地预测加工精度，为机床设计理念的改进和精度配置提供依据。
In order to predict the machining precision of the machine tool and validate its design concept,the geometric errors of a precise vertical machining center were analyzed,and its precision prediction model was established based on the multi-body system theory.The correlations among the multi-bodies were described with the topology structure and the low-order body array.The coordinate transformation relationships between multi-bodies were described based on the homogeneous transformation matrix.The characteristic matrix and the relative motion equations of the motions between 2 arbitrary adjacent objects of the multi-body system were derived.A precision prediction model was built for the precise vertical machining center.Based on the simulated machining of a typical workpiece,the precision prediction of the machine tool was realized.The results showed that the proposed precision model can describe the systemic structure of the vertical machining center effectively and Abstractively,predict the machining precision reasonably,provide a basis for the improvement of the machine tool design concept and the precision deployment.