基于复合点位移的旋转棒料直线度检测及弯曲定位方法

Method of Straightness Detection and Bending Positioning of Rotating Bar Stock Based on Composite Point Displacement

通过分析现有空间直线度测量方法的优缺点,结合目前企业对于棒料直线度检测的现状和需求,提出了一种基于复合点位移的旋转棒料直线度检测方法并实现弯曲角度定位。通过研究空间直线度、圆跳动、全跳动等形位误差关系,确定采用螺旋线提取法为测量点提取方法,两端点连线法为直线度评价方法。通过激光位移传感器沿轴向运动采集旋转棒料的位移,建立位移变化信息与直线度的数学模型,从而判断棒料的直线度误差;并根据位移变化信息与转动行程的关系实现棒料的弯曲角度定位。基于上述方法,设计开发了一套直线度检测及弯曲角度定位装置,通过实验对测量精度与误差进行分析,结果表明该系统的精度、重复精度、弯曲定位精度满足实际需求。

By analyzing the advantages and disadvantages of existing spatial straightness measurement methods and the current situation and demand of enterprises for bar straightness detection,a rotating straightness detection and bending angle positioning method based on composite displacement was proposed.By studying the spatial straightness,circular runout,and full runout isomorphic error relationships,the spiral extraction method was used as the measurement point extraction method,and the two-endpoint connection method was utilized as the straightness evaluation method.The laser displacement sensor collected the displacement change information along the axial movement while rotating the bar,and the mathematical model of the displacement change information and straightness was established to judge the straightness error of the bar stock.Moreover,the bending angle positioning was realized according to the relationship between the displacement change information and the rotation stroke.Based on the above methods,a set of straightness detection and bending angle positioning device was designed and developed.The measurement accuracy and error analysis were carried out by experimental test,the results show that the accuracy,repeatability and bending angle positioning accuracy of the system meet the actual needs.