In the process of screw thread manufacturing, the cooling liquid or lubricating oil will adhere to the screw thread surface, which affects the vision measurement results of the screw thread parameters. To simulate the adhesion behavior of oil on the thread surface during the actual measurement, four different attachment states were set in this experiment. An image measuring instrument was used to collect the screw thread images of different adhesion states. Then, the distribution of the oil film on the screw thread surface was analyzed with computer image processing. The visual inspection method was used to obtain the relative influence rate of the oil adhesion on the measurement result of the screw thread parameters. Finally, an experiment-based pitch diameter compensation method was proposed, and the compensation effect of this method was verified with the test method. Experiments showed that the effect of oil adhesion on the measurement results of the diameter parameters is greater than 7 µm, and the effect on the measurement result of the thread angle is greater than 0.1°. The compensation experiment showed that the compensation efficiency was above 70% for the pitch diameter.

中文翻译：

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油附着对机器视觉螺纹测量的影响

在螺纹制造过程中，冷却液或润滑油会附着在螺纹表面，影响螺纹参数的视觉测量结果。为了模拟实际测量过程中油在螺纹表面的附着行为，本实验设置了四种不同的附着状态。使用图像测量仪采集不同粘附状态的螺纹图像。然后，通过计算机图像处理分析了螺纹表面油膜的分布情况。采用目测法得到油附着对螺纹参数测量结果的相对影响率。最后，提出了一种基于实验的中径补偿方法，并通过试验方法验证了该方法的补偿效果。实验表明，油附着对直径参数测量结果的影响大于7 µm，对螺纹角度测量结果的影响大于0.1°。补偿实验表明，中径补偿效率在70%以上。