Automatic control of longitudinal form accuracy of a shaft at grinding

Abstract

Control and keeping constant the cutting force does not ensure accuracy of longitudinal form at shaft grinding because of technological system stiffness change in a longitudinal stroke. For this reason the method of control to calculate and keep the necessary cutting force which would keep constant deflections in grinding, i. e. the accuracy of longitudinal form is proposed. Cutting force at grinding is controlled by elastic displacement of centre pins and the system of automatic control keeps the calculated beforehand cutting force by changing the longitudinal feed speed. Equations for the calculation of elastic displacements and dependence of the displacements on stiffness of technological system elements are presented in the paper. Principle scheme of a control system is presented.