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Analiza statystyczna wyników eksperymentu technologicznego

Krzos J

Obróbka Metalu

2013

nr 1

50--56

Istotną częścią badań doświadczalnych jest opracowanie matematyczne wyników eksperymentu i przedstawienie ich w postaci modelu matematycznego. Starannie wykonana analiza wyników badań umożliwia wyciągnięcie prawidłowych wniosków poznawczych i utylitarnych. Zagadnienie to ma szczególnie duże znaczenie w technologii maszyn ponieważ w konsekwencji przyczynia się do zmniejszenia ogólnych kosztów wytwarzania.

The essential part of the experimental research is the mathematical elaboration of the results of an experiment and presentation of them in the form of a mathematical model. This article presents a statistical analysis of the results of the research of the exploitation characteristics of the CBN grinding wheels of the various degree of crystallization of the ceramic binder. It has been checked the conformity of the results with the Gaussian distribution, calculated the standard errors, selected the mathematical model, and checked its compatibility with the data obtained in the experiment.

Modelling of fracture wear in vitrified cBN grinding wheels

Jackson M. J.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

230-236

Purpose: The paper describes modelling of fracture wear in vitrified cBN grinding wheels. Design/methodology/approach: The approach used in the paper is based on using finite elements to model fracture wear processes in vitrified cBN grinding wheels. The approach used models fracture wear processes and ignores abrasive wear of the abrasive grains. Findings: The findings show that during grinding the grain is subjected to forces that create fracture initiation zones in the sharp abrasive grains where tensile and compressive stresses dominate in certain parts of the abrasive grains. Research limitations/implications: The findings show that further research is required that prevents the formation of crack initiation zones and considers the effects of wear flats on the magnitude of stresses in the abrasive grains. Practical implications: The results imply that abrasive fracture wear is the dominant wear mechanism when grinding with sharp vitrified cBN grinding wheels. Originality /value: The originality of this paper is reflected in the fact that this is the first time that fracture wear has been modelled in sharp vitrified cBN grinding wheels. The results presented in this paper will illuminate the need for accurate modelling of the wear of vitrified superabrasive grinding wheels.