In order to improve the processing precision and shorten the hob manufacturing cycle of the face gear,a precision generating hobbing method for face gear with the assembly spherical hob is proposed.Firstly,the evoluti...In order to improve the processing precision and shorten the hob manufacturing cycle of the face gear,a precision generating hobbing method for face gear with the assembly spherical hob is proposed.Firstly,the evolution of the cylindrical gear to spherical hob basic worm is analyzed,then the spherical hob basic worm is designed,thus the basic worm and spiral angle equation of spherical hob are obtained.Secondly,based on the design method of the existing hob,the development method of the assembly spherical hob is analyzed,the cutter tooth and the cutter substrate of the assembly hob are designed,and the whole assembly is finished.Thirdly,based on the need of face gear hobbing,a numerical control machine for gear hobbing is developed,and the equation of the face gear is obtained.Fourth,for reducing the face gear processing errors induced by equivalent installation errors,the error analysis model is established and the impacts of each error on the gear tooth surface are analyzed.Finally,the assembly spherical hob is manufactured and the gear hobbing test is completed.According to the measurement results,the processing parameters of face gear hobbing are modified,and the deviation of tooth surface is significantly reduced.展开更多
为检测光滑金属工件表面缺陷,以发光LED点阵作为被检工件的背景,搭建了基于平行光照明的视觉检测系统。由于工件表面与缺陷在明暗域图像中有完全相反的灰度表现,使用三个相机从不同角度采集被检工件图像;提取三幅图像中LED点阵各发光点...为检测光滑金属工件表面缺陷,以发光LED点阵作为被检工件的背景,搭建了基于平行光照明的视觉检测系统。由于工件表面与缺陷在明暗域图像中有完全相反的灰度表现,使用三个相机从不同角度采集被检工件图像;提取三幅图像中LED点阵各发光点的中心坐标,并以之作为特征点对图像实施了结合随机抽样一致(random sample consensus,RANSAC)估计的直接线性变换(direct linear transformation,DLT);最终实现了明暗域图像间的差动式融合。实验结果表明差动式融合不但有效地消除了背景带来的干扰信息,而且明显提高了缺陷与被检工件表面的对比度。展开更多
基金Project(9140xx8020212xx) supported by the Advanced Research Foundation,ChinaProject(GZ2018KF003) supported by the State Key Laboratory of Smart Manufacturing for Special Vehicles and Transmission System,China
文摘In order to improve the processing precision and shorten the hob manufacturing cycle of the face gear,a precision generating hobbing method for face gear with the assembly spherical hob is proposed.Firstly,the evolution of the cylindrical gear to spherical hob basic worm is analyzed,then the spherical hob basic worm is designed,thus the basic worm and spiral angle equation of spherical hob are obtained.Secondly,based on the design method of the existing hob,the development method of the assembly spherical hob is analyzed,the cutter tooth and the cutter substrate of the assembly hob are designed,and the whole assembly is finished.Thirdly,based on the need of face gear hobbing,a numerical control machine for gear hobbing is developed,and the equation of the face gear is obtained.Fourth,for reducing the face gear processing errors induced by equivalent installation errors,the error analysis model is established and the impacts of each error on the gear tooth surface are analyzed.Finally,the assembly spherical hob is manufactured and the gear hobbing test is completed.According to the measurement results,the processing parameters of face gear hobbing are modified,and the deviation of tooth surface is significantly reduced.
文摘为检测光滑金属工件表面缺陷,以发光LED点阵作为被检工件的背景,搭建了基于平行光照明的视觉检测系统。由于工件表面与缺陷在明暗域图像中有完全相反的灰度表现,使用三个相机从不同角度采集被检工件图像;提取三幅图像中LED点阵各发光点的中心坐标,并以之作为特征点对图像实施了结合随机抽样一致(random sample consensus,RANSAC)估计的直接线性变换(direct linear transformation,DLT);最终实现了明暗域图像间的差动式融合。实验结果表明差动式融合不但有效地消除了背景带来的干扰信息,而且明显提高了缺陷与被检工件表面的对比度。
