Optimization of parameters of processing of surface of details for restorative coatings

Abstract

The results of an analytical study of the parameters of the brush surface treatment of the
details of the transport means of the "shaft" type for the application of reducing gas-flame coatings
are provided to ensure maximum adhesion strength of the coating to the substrate, using the
mathematical theory of experimental design. For the analytical study, the following parameters
were chosen: diameter of the rotating brush needles (mm), free needle length (mm), brush rotation
speed (rpm), needle density (pcs/cm2).
Experiments have shown that such a random characteristic as the adhesion strength can
approximately be described by the normal distribution law and its maximum region can be found with
needle diameters from 0.35 to 0.95 mm with free needle lengths from 30 to 70 mm and at the number
of revolutions from 800 to 2500 rpm, and also with a density of the location of 20 to 40 pieces/cm2.
The maximum values of adhesion strength in the zero level are determined. The mathematical model
in the form of a polynomial allows to give a quantitative estimate of the influence of each factor on
the response function. A determinant is used to find the extremal values. The reliability of the results
of analytical studies is confirmed by the results of experimental studies and industrial tests.