Исследование динамических явлений, происходящих при прерывистом шлифовании

Abstract

Применение шлифовальных кругов на поверхностях, в которых имеются прорези, позволяет снизить тепловыделение в зоне резания. Целью научного исследования является определение условий создания в упругой системе станка колебаний, способствующих самозаточке режущего микрорельефа прерывистого круга, и возникновения ударного и параметрического резонансов. Выявлены условия прерывистого шлифования, при которых в упругой системе плоскошлифовального станка не возникают ударный и параметрический резонансы и появляется возможность самооформления режущего микрорельефа рабочей поверхности абразивного инструмента в процессе его работы.

The purpose of scientific research is to determine the conditions for the creation in the elastic system of useful vibrations that promote self-sharpener the cutting microrelief of the intermittent circle, and the detection of the conditions for appearance the shock and parametric resonances. It was established that with the increase of the circumferential speed of the grinding discontinuous circle VKR, the amplitude of forced oscillations A decreases, and the regions of parametrical stability of the system of the grinding machine are shifted in the direction of decreasing the number of slots n on the working surface of the circle. It has been established that in the studied intervals of numbers of cutting protrusions 5≤n≤40 and the discontinuity factor 0,3≤N≤40, with the decrease of the limb depth of cutting tL, the range of variation of amplitudes of forced oscillations A is narrowed, and the boundaries of the regions of the parametric stability of the system of the machine are expanded. It has been established that in order to maintain the amplitude of the forced oscillations A at a constant level and to prevent the exit from the parametric stability zone of the elastic system, it is necessary, when H-increasing the factor of discontinious N to decrease the number of openings on the discontinious grinding tool. It is established that with the increase in the number of cutting protrusions n in a discontinuous circle, the amplitude of forced oscillations A is decreasing, and the boundaries of the stability regions are expanded. Conditions of discontinuous grinding are found, where in the elastic system of the grinding machine there is no shock and parametric resonance and there is the possibility of self-sharpening of the cutting microrelief of the working surface abrasive tool during its operation.