Estimation and compensation for deviation of contour in slow tool servo precision turning for complicated curved surface
Estimation and compensation for deviation of contour in slow tool servo precision turning for complicated curved surface
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DOI：
10.1007/s12206-022-0736-z
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发表时间：
2022-07
影响因子：
1.6
通讯作者：
Feng-ze Qin;Jian-wei Ma;Zhenmei Jia;Guan-lin Li;Jian-zhou Zhang
中科院分区：
文献类型：
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作者：
Feng-ze Qin;Jian-wei Ma;Zhenmei Jia;Guan-lin Li;Jian-zhou Zhang
对于具有大坡度、多凸凹性等几何特征的复杂曲面，在超高精度车削加工时，进给轴的跟踪偏差所引起的轮廓微米级误差将变得不可忽视。为了减小微米级轮廓误差，提出了一种适用于慢车削加工的轮廓误差估计和预补偿方法。针对车床在加工过程中的轴线跟踪偏差估计问题，首先建立了车床轴线的稳态跟踪偏差模型。所提出的乘切向估计方法是由脚点的泰勒级数推导出来的。由于在STS车削加工中，C轴的旋转进给运动是刀具成形运动中的主要运动，因此保证了C轴位移的单调性。通过STS车床的雅可比矩阵求出了轴位置的补偿值。采用该方法后，进给轴跟踪误差引起的刀尖位置误差从1.087μm减小到0.025μm。对比实验的测量结果表明，本文提出的方法使加工零件的轮廓误差从5.72μm减小到4.36μm，有效地补偿了进给轴跟踪误差引起的微米级轮廓误差。
In the presence of extremely high precision turning the complicated curved surface with geometry features of large slope gradient and multi convex-concave characteristics, the micron-scale deviation of contour resulting from the tracking deviation of the feed axis becomes non-negligible. To diminish the micron-scale contouring deviation, this study presents a valid contouring error estimation and pre-compensation method for slow tool servo (STS) precision turning. Aiming at estimating the tracking deviation of the axis of the turning machine tool in the machining process, the steady-state tracking deviation model of the axis is first constructed. The proposed multiply tangential estimation method is derived from the Taylor series of the foot point. Since the rotation feed movement of the C axis is the main movement in cutting forming movement for STS turning machining, the monotonicity of the displacement for the C axis is ensured. The compensation value for the axis position is derived through the Jacobi matrix of the STS turning machine. With the presented approach, the tool tip location deviation induced by the tracking deviation of the feed axis reduces from 1.087 μm to 0.025 μm. The measurement results of the comparison experiments indicate that with the presented method in this study, the contouring error of the machined part reduces from 5.72 μm to 4.36 μm. The micron-scale contouring error resulting from the tracking deviation of the feed axis is effectually compensated.