自动钻铆通孔深度在线测量精度影响因素分析与实验研究
吴年汉1，陶冶*,1，王新2
（1.四川大学 机械工程学院，四川 成都 610065；2.航天材料及工艺研究所，北京 100076）
摘要：为实现大型复合板类零件的自动化钻铆，在前期研究中已形成通孔深度在线测量方法与装置，并完成样机研制与初期实验验证。然而，装置测量结果易受预设探针进给速度及预设白像素阈值大小的影响。本文首先针对探针进给速度以及白像素阈值大小对测量精度的影响进行深入分析，探究上述测量参数对测量精度的影响机理与影响规律，并对其影响趋势进行预测，然后进行了进给速度对测量精度的影响实验，以及白像素阈值对测量精度的影响实验，验证了预测方法的正确性。实验结果表明，随着探针进给速度的增加，测量精度会逐渐降低；而随着白像素阈值的减小，测量的孔深值会逐渐减小。
关键词：在线测量；通孔深度；进给速度；白像素阈值；图像处理
中图分类号：TH161+.7；TH711；TP23 文献标志码：A doi：10.3969/j.issn.1006-0316.2019.12.002
文章编号：1006－0316 (2019) 12－0009－07
Analysis and Experimental Research on Influencing Factors of On-Line Measurement Accuracy of Through Hole Depth for Automatic Drilling and Riveting
WU Nianhan1，TAO Ye1，WANG Xin2
( 1.School of Mechanical Engineering, Sichuan University, Chengdu 610065, China;2.Aerospace Research Institute of Materials and Processing Technology, Beijing 100076, China )
Abstract：In order to realize the automatic drilling and riveting of large composite plate parts, the on-line measurement method and device for through-hole depth have been formed in the previous research, and the prototype development and initial experimental verification are completed. However, the device measurement results are susceptible to the preset probe feed rate and the preset white pixel threshold size. In this paper, the influence of probe feed rate and white pixel threshold on the measurement accuracy is deeply analyzed. The influence mechanism and influence law of the measurement parameters above on measurement accuracy are explored, and the influence trend is predicted. Then, experiments on how the feed rate and the white pixel threshold affect the measurement accuracy are carried out to verify the correctness of the prediction method. The experimental results show that the measurement accuracy will gradually decrease with the increase of the probe feed rate; and as the white pixel threshold decreases, the measured hole depth will gradually decrease.
Key words：on-line measurement；through hole depth；feed rate；white pixel threshold；image processing
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收稿日期：2019－09－12
基金项目：国家自然科学基金项目（51505310）；国家教育部重点实验室开放基金项目（B201802）
作者简介：吴年汉（1996－），男，湖北武汉人，博士研究生，主要研究方向为创新设计理论与方法、精密测量技术及装备。*通讯作者：陶冶（1984－），男，辽宁抚顺人，博士，副教授，主要研究方向为智能制造与智能装备、创新设计理论与方法、复杂机电系统精密测量与控制。
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