数控凸轮轴磨床误差建模与辨识技术理论研究

发布时间：2018-03-20 11:06

本文选题：数控凸轮轴磨床　切入点：运动分析　出处：《振动与冲击》2017年18期 　论文类型：期刊论文

【摘要】：以某类型数控凸轮轴磨床为研究对象,通过对其结构和运动的分析,确定了该机床共有21项误差参数。通过建立含有误差参数的相邻体坐标系运动关系模型,将机床运动体划分为"床身-工件"和"床身-刀具"两条运动链,建立了该机床的拓扑结构图,然后采用多体系统理论对该机床误差进行了建模;对各运动体分别建立了体坐标系和运动参考坐标系,结合相邻体坐标系运动关系模型求出对应的变换矩阵,提出了有误差影响情况下实现精密加工约束条件方程为P_w=P_t,并对该方程进行了求解;建立了凸轮轴磨削加工时X-C轴联动的数学模型,求出了磨削点在工件坐标系和刀具坐标系中的坐标。对影响凸轮轴加工的15项误差参数使用球杆仪采用3种测量方式进行了辨识,这为机床误差补偿的研究提供了必要条件。
[Abstract]:Taking a certain type of CNC camshaft grinder as an object of study, through the analysis of its structure and motion, the 21 error parameters of the machine tool are determined, and the motion relation model of adjacent body coordinate system with error parameters is established. The kinematic body of the machine tool is divided into two moving chains: "bedbody-workpiece" and "bed-tool". The topological structure diagram of the machine tool is established, and then the error of the machine tool is modeled by using the theory of multi-body system. The body coordinate system and the motion reference coordinate system are established for each moving body, and the corresponding transformation matrix is obtained by combining with the motion relation model of the adjacent body coordinate system. In this paper, the constraint equation of precision machining under the influence of errors is proposed and solved, and the mathematical model of X-C axis linkage in camshaft grinding is established. The coordinates of grinding points in the workpiece coordinate system and the tool coordinate system are obtained. The 15 error parameters affecting camshaft machining are identified by three measuring methods using a ball rod instrument, which provides a necessary condition for the research of machine tool error compensation.
【作者单位】：北京工业大学机械工程与应用电子技术学院;
【基金】：国家自然科学基金资助项目(51275014) 国家科技重大专项(2013ZX04011013)
【分类号】：TG596

【相似文献】