SELECTION OF ABRASIVE WHEELS ACCORDING TO THE GRINDING BURNS OF HARDENED PARTS USING DIGITAL TECHNOLOGIES


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Abstract

The authors developed the procedure of quantitative assessment of grinding burns on the base of digital technologies. This procedure includes three steps: macrophotography of original surface in the reflected light rays; its digitization using Adobe Photoshop CS6 13.1.2 software and its conversion in the form of raster images of different colours. The advantages of this method are: low labor input, environmental safety and the possibility of wide use for any scientific purpose and in any industrial conditions. It was tested within the pendulum grinding of flat parts made of 30ChGSA hardened steel (σUST=1080 MPa, δE=10%). The parts were ground by different against grains, hardness and porosity wheels: 25AF46K10V5-PО3, 25AF46L10V5-КF35, (92A, 25A)F46L6V24, 25AF46M12V5-PО3, EKE46K3V.

To prove the reliability of this innovative technology of grinding burns assessment, the authors carried out the study of parts microhardness. Taking into account the stochastic nature of grinding, to process the observation results on both grinding output parameters, the authors used the statistical methods which are divided into parametric and nonparametric (in particular, the rank methods). Statistical methods are. The advantages of these methods are the possibility of taking statistical decisions with the given reliability, as well as the assessment of cutting wheels ability not only according to the position measures (averages, medians), but also according to the measures of dispersion: deviations standards, ranges and quartile latitudes. The measure of one-dimension latitudes dispersion is more important while grinding essential parts on pre-set machines to reduce the probability of rejected parts. The study showed that in the conditions of homoscedasticity and normality of distributions violations, it is necessary to use the non-parametric method, wherein the medians and quartile latitudes are used as one-dimensional frequency distributions. The authors revealed the correlation between the position measures for burn density and microhardness while grinding by abrasive wheels using the mode: vc=35 m/s, slo=7 m/min, str=1 mm/double pass, t=0,015 mm, z=0,15 mm, when the increase of burns is accompanied by the reduction of 30ChGSA parts microhardness. The best results according to the position measures were shown by 25AF46K10V5-PО3 wheel, and according to the grinding accuracy - 25AF46L10V5-КF35 wheel.

About the authors

Yakov Iosifovich Soler

Irkutsk National Research Technical University, Irkutsk

Author for correspondence.
Email: solera@istu.irk.ru

candidate of technical sciences, assistant professor of the Department «Mechanical Engineering Technology»

Россия

Denis Yurievich Kazimirov

Irkutsk National Research Technical University, Irkutsk

Email: solera@istu.irk.ru

candidate of technical sciences, assistant professor of the Department «Mechanical Engineering Technology»

Россия

Van Le Nguyen

Irkutsk National Research Technical University, Irkutsk

Email: solera@istu.irk.ru

postgraduate student of the Department «Mechanical Engineering Technology»

Россия

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