Abstract
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.
Highlights
Visual measurement technology has great advantages in screw thread measurement
The results show that as the viscosity of the oil and the degree of oil accumulation increase, the amount of change in the measurement result of the minor diameter of the screw thread becomes larger and larger
The analysis of the experimental results found that the relative influence of oil adhesion on the pitch diameter measurement results of the screw thread selected in the experiment is as follows
Summary
Visual measurement technology has great advantages in screw thread measurement. First, machine vision measurement methods have higher measurement efficiency. To analyze the influence of oil adherence on the result of the major diameter measurement, the relative position change of the crest was detected during the research.
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