RELATIONSHIP BETWEEN PROCESSING TEMPERATURE AND INTERRUPTION IN THE GRINDING PROCESS

Valerii Naddachyn

doi:10.20998/2078-7405.2020.93.14

Abstract

This article discusses issues related to the processing of grinding wheels with an intermittent working surface and their influence on the grinding process. To solve this problem, it was necessary to first identify the relationship between the discontinuity of the process and the shock load. Next, determine the trajectory of movement of the forming point of the circle. A diagram of the movement of the center of mass of the circle and the forces acting on it is constructed. Equations are derived that determine these displacements. A system of equations describing the movement of the spindle axis under the action of cutting forces and power imbalance of the wheel is presented. The relationship between the frequency, amplitude of forced vibrations and displacements of the axis under the action of a harmonic disturbing force has been established. Theoretical calculations are confirmed by practical results. Based on the movement of the forming point of the circle, the parameters of the profile of the machined surface are set. The influence of the discontinuity of the process on the grinding temperature is considered.

Highlights

(7) The system of differential equations describing the movement of the spindle axis of the grinding wheel in space under the action of cutting forces and imbalance of the wheel has the form (8): (8) The system of equations (8) is compiled for the power imbalance of the circle, at which the vibration amplitude is 2 ... 3 times greater than the vibration amplitude caused by momentary imbalance
We find the displacement of the axis under the action of a harmonic disturbing force Fв
A system of equations (13) was obtained, which determines the coordinates of the movement of the grinding wheel axis, taking into account the amplitude and frequency of its oscillations under the action of the emerging forces in the section plane perpendicular to the spindle axis, along which the trajectory of the wheel center movement was calculated (Fig. 8)

Summary

Introduction

When recording an oscillogram during grinding, oscillations are clearly visible associated with the presence of cutting forces and imbalance of the wheel, the frequency of which corresponds to the spindle rotation speed, with the superposition of a higher order harmonic on the fundamental component, caused by the action of impact forces Fv, the frequency of which corresponds to the frequency of change of these forces (the number of protrusions on the circle) (Fig. 2, 3).

Results

Conclusion