超薄壁回转件旋压后外径在机测量方法研究

为准确测量超薄壁回转件旋压后的外径尺寸，提出了一种基于重构横截面轮廓曲线的等效外径在机测量方法。该方法利用周向均布的3套线激光位移传感器与旋轮架的轴向移动模块，获得回转件任意轴向位置横截面的外轮廓数据；通过对3套传感器所获截面数据的坐标变换及数据匹配，实现截面完整轮廓数据的精确拼接,并以离散数据点的保形曲线重构方法重构截面外轮廓曲线，利用同一闭合曲线各变形状态的长度不变性，得到了截面等效外径；分别以芯轴及薄壁回转件开展了外径检测实验。实验结果表明：所提方法可准确测量超薄壁回转件外径，其精度为0.019 mm.

Research on On-machine Measurement Method for Outer Diameter of Spinned Ultra-thin-walled Rotational Parts

For more precise measurement of outer diameter of spun ultra-thin-walled rotational parts, the on-machine measurement of the equivalent outer diameter based on the reconstructed cross section contour curve is proposed. In this method, three sets of line laser displacement sensors are distributed uniformly along the circumferential direction， and the outer contour data of the cross section of rotational part at any axial position is obtained by using the three sets of line laser displacement sensors and the axial movement module of the spinning roller frame. The complete cross section outer contour data is spliced by the coordinate transformation and matching of the cross section data obtained by the three sensors, the contour curve is reconstructed by the shape preserving curve reconstruction method of discrete data points, and the equivalent outer diameter of the cross section is calculated according to length invariance of the same closed curve. Finally, the outer diameters of the mandrel and the thin-walled rotational parts are mea-sured. The experimental results show that the proposed method can be used to precisely measure the outer diameters of ultra-thin-walled rotational parts with measuring accuracy of 0.019 mm.