STUDY OF IMPACT REGULARITIES OF NON-ENGAGING BARS ON WORKPIECE SURFACE

The paper aims at studying the effects of abrasive grains of honing brars on the surface of workpieces. Basing on the probability distribution of abrasive grains by volume of the tool’s cutting layer and the process kinematics the authors have calculated the height distribution pattern of a part’s asperities. This distribution helps determining both roughness parameters of a part’s surface, and cutting process features - the area of cuts, the number of contact grains, etc. The paper provides a comparison of discrete and continuous tool models and their mathematical ratio. A discrete model more realistically reflects the abrasive tool structure, however there are no convenient methods for measuring it. The authors present an established mathematical ratio between the distribution of abrasive grains according to the height and the depth distribution of scratches produced by the tool on a polished sample. Basing on the obtained information on the discrete model of diamond bars, the authors have calculated geometric parameters of their cutting surface. The comparison of the calculated and experimentally found values of the bar parameters confirms the accuracy of the proposed method. It has been shown that both discrete and continuous mathematical models of the abrasive honing tool bring identical results. The authors have obtained general analytical expressions to calculate the roughness parameters of a part’s surface, the metal removal rate, cutting forces, cut areas, the number of contact grains, etc. Inserting the characteristics of bars in the formulas, one can calculate all microgeometry parameters of a part.

хонингование, хонинговальные бруски, абразивные зерна, повышение надежности, процесс резания, математическое исследование, дискретная модель, непрерывная модель, honing, improving reliability, cutting process, mathematical analysis, discrete model, continuous model

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