Peculiarities of stress field formation during cutting isotropic material by mining machine cutters

Peculiarities of the cutting process of isotropic material by mining machine cutters are considered. The objective of the studies is revealing regularities of the process of stress field formation in the pre-cutter zone of the breakable massif and assessment of the possibility of purposeful control of cutting process parameters. Taking into account the multifactorial nature and randomness of the process of elementary chippage formation, an experimental method of studies with the use of full-sized cutters was accepted as a determining principle. A stand for cutting an isotropic transparent material with an optical method of observing stress fields in the under-cutter zone, the procedure of conducting studies and results were presented in the paper. The use of quasi-isotropic acryl glass as an object for destruction allowed reducing the influence of multifactorial nature and randomness on the process of formation of the stress field and elementary chippage. The modes, excluding continuous chip formation, determined by, on the one hand, the phenomenon of material creep - at low cutting speeds, and, on the other hand - cutting speed modes by the terms of thermal conditions, were determined. Continuation of experimental studies of the cutting process of quasi-isotropic materials is aimed at revealing the most significant factors and determination of their influence on the change of phase parameters of elementary chippage and at revealing the very opportunity of formation of elementary chippage characteristics.