REAL-TIME MEASUREMENT OF MACHINE TOOL TEMPERATURE FIELDS AND THEIR EFFECT ON MACHINING ERRORS

Abstract

This paper presents a method and apparatus to carry out realtime measurement of temperature fields and thermal origin machining errors in machine tools. Experiments are performed on a vertical machining center, and the experimental data are analyzed in the data processing system. Displacements and temperatures are measured during machine tool operation. Platinum resistance sensors are used to collect the temperature changes. High accuracy laser displacement sensors and an eddy current displacement sensor are used to measure the thermal origin errors in the positioning of the machine spindle in the X-, Y- and Z-axes. To get more accurate experimental data, a rolling-mean filter is introduced in the signal processing to eliminate the geometric form error induced by spindle radial runout, angular swing and axial shifting. The results show that the measurement system and testing method is highly efficient and precise.http://dx.doi.org/10.5755/j01.mech.17.4.572