Geometry and stress condition of the oriented abrasive grains with controlled form

The efficiency of the polishing process is determined by the properties of abrasive grains, including its form and orientation in the body of the grinding tool. It is possible to improve the operational factors of the grinding instruments by ordering of the grain geometry, selection of the rational form and orientation of abrasive grains for specific processing conditions and parameters of the power load. To solve this problem the research technique for estimation of the abrasive grains front angle parameter and tension value parameter with the form and orientation parameters is proposed. The offered technique is successfully tested in practice. During the development of this technique the interrelation of the alumina abrasive grain front angle parameter with the form, orientation and wear parameters is found. It is established that the minimum values of the front angles are fixed at grains of an isometric form and tangentially oriented grains. The maximum values of front angles are fixed at the needle and lamellar grains oriented under angles Θ = 22,5° ÷ 45° to the cutting plane. The analysis of tension in the orientated alumina abrasive grains of various forms in cutting discs is also made. It is established that for cutting discs the rational angle of the abrasive grains orientation is about Θ = 67º30΄. Practical enquiry of the developed technique is made by carrying out the experiments for determination of ultimate strength of the orientated abrasive grains with a controlled form of various brands and sizes by monoaxial compression.

polishing process, grinding instruments, cutting discs, abrasive grains, front angle of the abrasive grains, the form parameter coefficient, orientation angle of the abrasive grains, wear out of the abrasive grains, stress value in the abrasive grains, solidity of the abrasive grains.