Research Papers

Prediction of Blunting Area of Abrasive Grains on a Grinding Wheel

[+] Author and Article Information
Aleksandr A. Dyakonov

Department of Mechanical Engineering,
South Ural State University,
Lenin Prospect, 76,
Chelyabinsk 454080, Russia
e-mail: diakonovaa@susu.ru

Dmitrii V. Ardashev

Associate Professor
Department of Mechanical Engineering,
South Ural State University,
Lenin Prospect, 76,
Chelyabinsk 454080, Russia
e-mail: ardashevdv@susu.ru

Manuscript received March 27, 2017; final manuscript received September 26, 2017; published online November 2, 2017. Assoc. Editor: Kai Cheng.

J. Manuf. Sci. Eng 139(12), 121004 (Nov 02, 2017) (5 pages) Paper No: MANU-17-1169; doi: 10.1115/1.4038055 History: Received March 27, 2017; Revised September 26, 2017

The article presents the results of calculating the blunting area of abrasive grains of grinding wheels, determined in accordance with the previously developed model. The mathematic model of the size of the blunting area of an abrasive grain considers the main mechanisms of its wear—mechanical and physicochemical. These mechanisms are taken into account in the model. For the first time, the kinetic theory of strength was used for determining the mechanical wear of abrasive grain. The mass transfer theory was used to study the physicochemical wear: coefficients of chemical affinity with the abrasive material are experimentally defined for the assortment of workpiece materials. The developed mathematic model is a multiple-factor one and this will allow to predict the size of wear of the abrasive wheel for different technological conditions. Also, the article presents the experimental method for determining the blunting area of abrasive grains of grinding wheels, which allows making a direct measurement of wear parameters of grinding wheels. The main parameter of grinding wheel wear is the length of the blunting area of the grain, which was measured out in the direction of the cutting speed vector. The grinding wheels of different graininess were studied—F60 and F46. The grinding wheel working surface was studied by numerical photos and microscope. The results of these experiments have confirmed the adequacy of the design model.

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Grahic Jump Location
Fig. 2

Blunting areas of abrasive grains, for various intervals of tool operation time (×215, 24AF60L7V wheel): (a), (b) 1.5 min; (c), (d) 2,5 min; (e), (f) 5 min; (g) and (h) 11 min

Grahic Jump Location
Fig. 1

The working surface of grinding wheel 24АF60L7V, for various intervals of tool operation time: (a) 0.5 min; (b) 1 min; (c) 1.5 min; (d) 2 min; (e) 2.5 min; and (f) 3 min

Grahic Jump Location
Fig. 3

Blunting area of abrasive grain with a measuring scale (×215, wheel—24AF46L7V, T = 6 min)

Grahic Jump Location
Fig. 4

The dependency of the value of the blunting area on the operating time for the different graininess of wheel: (a) F46 and (b) F60 1 – obtained by formula (1); 2 – experiment’s data; 3–Dyakonov’s data [28]; 4 –Korchak’s data – constant [18]; 5 – Matalin’s data – constant [17]



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