Assembly Quality Evaluation of Sealing Planar Based on High Precision Point Cloud

doi:10.3901/JME.2018.11.121

Abstract

Abstract: The sealing plane has an important application in the industrial field. To ensure seal, its machining and assembly quality must be strictly controlled. In order to evaluate the assembly quality of the sealing plane in an accurate, efficient and visual way from the perspective of sealing performance, a new method, based on the high-precision point cloud is presented, using the medial axis transform(MAT) to evaluate the quality of seal plane assembly method. First, based on high-definition metrology (HDM) obtains the high-precision point cloud data of sealing planar that is with waviness characteristics, and then registers the point cloud data according to the assembly location and position of the parts. Finally, based on the MAT, calculate the leakage channel of sealing planar, so that the assembly quality of the sealing planar can be evaluated. It focuses on the study of using MAT to calculate leakage channel, and improves the fast orientation method of the point cloud data in the normal vector estimation. In order to verify the effectiveness of the method proposed, a verification experiment was conducted on the head deck faces of a leaking engine block and a cylinder head. The results show that the proposed method can accurately identify the location of the leak and simulate the shape of the leak channel based on different segmentation thresholds. This method can make qualitative and quantitative theoretical predictions and evaluations on the seal plane sealing performance.

Key words: assembly quality, high-definition metrology, medial axis transform, point cloud, seal detection

CLC Number:

TP391
TB42

ZHANG Xiaobing, LIU Haijiang. Assembly Quality Evaluation of Sealing Planar Based on High Precision Point Cloud[J]. Journal of Mechanical Engineering, 2018, 54(11): 121-128.

References

[1] 朱炜,陈磊. 内燃机装配线泄漏检测技术[J]. 汽车工艺师, 2013(8):65-69. ZHU Wei, CHEN Lei. Leak detection technology of internal combustion engine assembly line[J]. Automobile Technician, 2013(8):65-69.
[2] 周彭晨. 装配精度检测中的自适应特征分割方法及其在虚拟装配中的应用[D]. 杭州:浙江大学, 2016. ZHOU Pengchen. Adaptive feature segmentation method assembly accuracy detection and its application onvirtual assembly[D]. Hangzhou:Zhejiang University, 2016.
[3] JAYARAM S, WANG Yong, JAYARAM U, et al. A virtual assembly design environment[J]. Computer Graphics & Applications IEEE, 1999, 19(6):44-50.
[4] HUANG Yunping. An efficient approach for solving the straightness and the flatness problems at large number of data points[J]. Computer-Aided Design, 2003, 35(1):15-25.
[5] 唐水龙,余剑锋,李原,等. 基于虚拟配合面的带平面度零件装配容差分析[J]. 计算机集成制造系统, 2011, 17(4):711-715. TANG Shuilong, YU Jianfeng, LI Yuan, et al. Assembly tolerance analysis for parts with flatness based on virtual mating plane[J]. Computer Integrated Manufacturing Systems, 2011, 17(4):711-715.
[6] 罗钧,王强,付丽.改进蜂群算法在平面度误差评定中的应用[J].光学精密工程, 2012, 20(2):422-430. LUO Jun, WANG Qiang, FU Li. Application of modified artificial bee colony algorithm to flatness error exaltation[J]. Optics & Precision Engineering, 2012, 20(2):422-430.
[7] 肖田元.虚拟制造[M].北京:清华大学出版社, 2004. XIAO Tianyuan. Virtual manufacturing[M]. Beijing:Tsinghua University Press, 2004.
[8] 张志贤,刘检华,宁汝新. 虚拟装配中基于多刚体动力学的物性装配过程仿真[J]. 机械工程学报,2013,49(5):90-99. ZHANG Zhixian, LIU Jianhua, NING Ruxin. Physical assembly process simulation based on multi-rigid-body dynamics in virtual assembly[J]. Journal of Mechanical Engineering, 2013, 49(5):90-99.
[9] ZHONG Yanru, QIN Yuchu, HUANG Meifa, et al. Constructing a meta-model for assembly tolerance types with a description logic based approach[J]. Computer-Aided Design, 2014, 48(3):1-16.
[10] 裘辿. 零件表面混合维建模理论、方法及其在产品装配质量预测中的应用[D]. 杭州:浙江大学, 2012. QIU Chan. Theory and method of hybrid dimensional part surface modeling and its application in prediction of product assembly quality[D]. Hangzhou:Zhejiang Universtiy, 2012.
[11] 伯彭波, 张彩明. 侧铣加工中铣刀形状和运动路径的求解[J]. 计算机辅助设计与图形学学报, 2016, 28(10):1779-1785. BO Pengbo, ZHANG Caiming. Cutter shape determination and tool path generation in CNC flank milling[J]. Journal of Computer-Aided Design & Computer Graphics, 2016, 28(10):1779-1785.
[12] SURIANO Saumuy, WANG Hui, SHAO Chenhui, et al. Progressive measurement and monitoring for multi-resolution data in surface manufacturing considering spatial and cross correlations[J]. ⅡE Transactions, 2015, 47(10):1033-1052.
[13] YI Liao. Extraction of 3D machined surface features and applications[D]. Michigan:The University of Michigan, 2010.
[14] BLUM H. A Transformation for extracting new descriptors of shape[C]//Proceedings of Models for the Perception of Speech and Visual Form. Cambridge:MIT Press, 1967:362-380.
[15] CULVER T, KEYSER J, MANOCHA D. Exact computation of the medial axis of a polyhedron[J]. Computer Aided Geometric Design. 2004, 21(1):65-98.
[16] RAVI P, HUGO L. Robust approximation of the medial axis transform of lidar point clouds as a toolfor visualization[J]. Computers&Geosciences, 2016, 90:123-133.
[17] CHAUSSARD J, COUPRIE M, TALBOT H. Robust skeletonizetion using the discrete-medial axis[J]. Pattern Recognition Letters, 2011, 32(9):1384-1394.
[18] 李盼. 基于二次误差最小化的中轴变换简化研究[D]. 北京:清华大学, 2015. LI Pan. Computing medial axis transform by quadratic error minimization[D]. Beijing:Tsinghua University, 2015.
[19] FRANCESC P R, ROLAND L, ANDREAS A. Modeling of leakage on metal-to-metal seals[J]. Tribology International, 2016, 94:421-427.
[20] MARK M. Surface profile analysis for conformable interfaces[J]. Journal of Manufacturing Science and Engineering, 2003, 125(3):624-627.
[21] 王醒策,蔡建平,武仲科,等. 局部表面拟合的点云模型法向估计及重定向算法[J]. 计算机辅助设计与图形学学报, 2015(4):614-620. WANG Xingce, CAI Jianping, WU Zhongke, et al. Normal estimation and normal orientation for point cloud model based on improved local surface fitting[J]. Journal of Computer-Aided Design & Computer Graphics, 2015, 27(4):614-620.
[22] BOULCH A, MARLET R. Fast and robust normal estimation for point clouds with sharp features[C]//Computer Graphics Forum. Blackwell Publishing Ltd, 2012:1765-1774.
[23] 任晓, 吴承伟, 周平. 粗糙表面的气体密封性能研究[J]. 机械工程学报, 2010, 46(16):176-181. REN Xiao, WU Chengwei, ZHOU Ping. Gas sealing performance study of rough surface[J]. Journal of Mechanical Engineering, 2010, 46(16):176-181.