Abstract
This article shows the regularities of the formation of the relationship between the parameters of the roughness of the treated surface under the conditions of processing with a tool made of superhard materials. Features of formation of the ratio of height parameters of roughness Rmax/Ra for conditions of diamond-abrasive processing are shown. In general, in relation to Rmax/Ra we have a kind of "roughness arc", when first for a normal untreated rough source surface it is close to 4, then abrasive-diamond treatment of this surface raises this ratio to 6 and then to 8, but further methods of abrasive finishing and polishing reduce the ratio to 6 and then chemical-mechanical polishing to a high-quality surface returns this ratio to values close to 4. This means that if the initial cost of grinding the original surface affects the increase in the ratio, then the subsequent cost of finishing and polishing work reduces the value of the ratio Rmax/Ra to the original. The peculiarities of obtaining a treated surface with a special microprofile, which is a flat protrusions with recesses (a kind of "pockets") for placing oil to increase the service life of such a surface.
Highlights
An arithmetical average deviation from the mean line Ra is a surface roughness parameter most widely accepted and used in scientific and technical publications
Parameters, characteristics and designations" indicated that the roughness parameters are selected from the following nomenclature: Ra – arithmetic mean deviation of the profile; Rz is the height of the profile irregularities at 10 points; Rmax is the highest profile height; Sm is the average step of inequalities; S – the average step of the local protrusions of the profile; tp is the relative reference length of the profile, where p is the value of the cross-sectional level of the profile
Generalized data on the influence of various machining methods and modes using tools of superhard materials (SHM) on these parameters have not been adequately presented in the literature
Summary
An arithmetical average deviation from the mean line Ra is a surface roughness parameter most widely accepted and used in scientific and technical publications. – Ra and tp for the parts prone to contact stresses, – Ra for press-fit joints, – maximum height of irregularities Rmax, maximum peak height Rp and mean spacing of the profile irregularities Sm for the parts subjected to variable loads, – Ra and tp for the parts that form tight joints. In this case, it is stated that the parameter Ra is preferred. Using this parameter, in [2] the classification of methods of abrasive processing (roughness) – grinding (when Ra is from 100.000 Å to 1.000 Å or from 10 μm to 0.1 μm), lapping (when Ra is from 1.000 Å to 100 Å or from 0.1 μm to 0.01 μm), polishing (when Ra is from 100 Å to 1 Å or from 0.01 μm to 0.0001 μm)
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