Justification of the influence of the Grubbs criterion on the quantitative assessment of the results of technical research
Keywords:
Grubbs criterion; degree of work hardening: feed; dis-persion; average.Abstract
There are known technological methods of cold working applied to increase the strength of the surface layer of parts processed by cutting. However, the existing methods of cold working do not allow their use to increase the wear resistance of the surface of holes of a relatively small diameter. This reduces the service life of the technological equipment as a result of wear of the contact surfaces of such holes. There are known re-search results confirming the possibility of hardening the surface of small diameter holes by processing with spiral drills. However, the average value of hardening, and the dispersion on which the quality of processing the results of studies by methods of mathematical statistics depends, in turn largely depends on the quality of measurements of the experimental results. To improve the quality of the measurement results, the Grubbs criterion is used. The paper shows the influence of the Grubbs criterion on the qualita-tive and quantitative assessment of the results of technical experiments. The dependence of the results of variance analysis on the Grubbs criterion is substantiated, which allows increasing the accuracy of determining the presence of the effect of the feed on the average strength of the surface of drilled holes. The positive effect of the Grubbs criterion on the results of statistical methods of variance analysis is experimentally confirmed.
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