JUSTIFICATION OF STATISTICAL METHODS FOR IMPROVING THE QUALITY OF TECHNICAL EXPERIMENTS
Keywords:
drill; feed; dispersion; average; analysis; factor; statistics.Abstract
Of all the technological methods for producing holes in solid material by cutting, drilling is the only method that allows producing a hole in one pass of the tool. It is known that machining with the removal of a certain layer of material from the surface being machined leads to the formation of a surface layer of reduced hardness with tensile residual stresses that negatively affect the quality indicators of the machined surface during contact friction with the mating parts of the technological equipment. Existing technological methods for increasing the hardness of machining surfaces by cutting using the cold working method do not allow them to be used for small diameter holes. The paper shows that drilling allows obtaining a machined surface with a hardness exceeding the initial hardness of the material being machined, which indicates the presence of compressive stresses in the surface layer after machining by drilling. The paper substantiates statistical methods for improving the quality of technical experiments and presents the results of technical tests confirming the positive results of using these methods.
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