基于“S”形加工样件的复合数控机床几何误差逆向追踪

发布时间：2018-02-27 15:50

本文关键词： 复合机床误差溯源加工缺陷敏感度 “S”形样件　出处：《机械工程学报》2016年21期 　论文类型：期刊论文

【摘要】：基于对"S"形加工样件的复合机床误差影响溯源的研究,提出一种辨识影响加工缺陷最大的误差参数的方法。该方法将"S"形样件加工缺陷与复合数控机床成形运动综合考虑,采用三次B样条曲面对"S"形样件加工缺陷进行数学表征,并逆向推导出了"S"形样件加工缺陷处对应的刀具中心的实际位置,求解出了实际加工曲面到机床刀具的映射关系。同时利用多体系统误差分析理论建立了复合机床加工缺陷生成模型,并从机床角度求解出了缺陷处误差的表达方程。接着在"S"形样件缺陷产生的位置处,根据误差参数的敏感度及其实测值计算各项误差参数对加工缺陷的贡献并进行排序,确定对加工缺陷影响较大的5项误差参数。试验结果表明:该5项误差参数和全部误差参数同时作用下各点的误差进行差值比较,发现差值最大不超过±1.5μm,因此ε_(yC_1)、δ_z(B)、ε(C_1)、ε_x(C_1)、ε_(x_1C_1)是对加工缺陷影响较大的5项误差参数。
[Abstract]:Based on the study of the error traceability of the "S" shape machining sample, a method for identifying the maximum error parameters affecting the machining defect is proposed. The method considers the machining defect of the "S" shape sample and the forming motion of the composite NC machine tool. The machining defects of "S" shape sample were numerically characterized by cubic B-spline curve, and the actual position of the tool center corresponding to the machining defect of "S" shape sample was deduced in reverse. The mapping relationship between the actual machining surface and the tool tool is solved. At the same time, the machining defect generation model of the composite machine tool is established by using the multi-body system error analysis theory. The expression equation of the errors is solved from the point of view of the machine tool. Then, at the position where the defects in the "S" shape sample are generated, the contribution of the error parameters to the machining defects is calculated and sorted according to the sensitivity of the error parameters and the measured values. The experimental results show that the errors of each point under the action of the five error parameters and all the error parameters at the same time are compared. It is found that the maximum difference is not more than 卤1.5 渭 m, so 蔚 _ s _ _ _, thus, 蔚 _ _ _
【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】：北京市自然科学基金(3142005) 国家自然科学基金(51105005,51475010)资助项目
【分类号】：TG659

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