OBRABOTKAMETALLOV TECHNOLOGY Vol. 26 No. 1 2024 To perform the analysis, a comparison of the variances in the width of the specimens surfaced without exposure to a magnetic fi eld and when exposed to a magnetic fi eld was made using F-criterion (fi g. 10). a b Fig. 10. Results of analysis of the infl uence of the longitudinal magnetic fi eld on the walls width error of surfaced specimens: a – table of F-criterion calculation results; b – box plot of deviations From the obtained results (see fi g. 10) it follows that the defl ection in the width of the walls of the specimens surfaced without exposure to a magnetic fi eld and when exposed to a longitudinal magnetic fi eld is statistically insignifi cant, the value of the calculated F-criterion is 1.5275 with a signifi cance index of 0.098, which exceeds the accepted signifi cance level. Conclusion The conducted experimental study of the geometry of the surfaced specimens showed that exposure to a longitudinal magnetic fi eld: – caused a statistically signifi cant change in single dimensions; namely an increase in the width of the surfaced layers by 34.1 % with a calculated signifi cance index close to zero, and a decrease in the height by 20.2 % with a calculated signifi cance index equal to 2.7×10−5; – caused a statistically signifi cant change in the overall dimensions of the specimens consisting of fi ve layers; namely, the width of the specimens increased by 11.2 % with a calculated signifi cance index of 4.3×10−3, and the height of the specimens decreased by 10.3 % with a calculated signifi cance index of 6.3×10−5. – did not have a statistically signifi cant eff ect on the change in the defl ection from straightness in vertical direction for the specimens’ side walls with a calculated signifi cance index of 0.3277. – did not have a statistically signifi cant eff ect on the change in the defl ection in the width of the specimens’ walls, with a signifi cance index of 0.098.
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