Improvement of Working Accuracy of a Numerically Controlled Machine Tool by Computer Control Compensation (2nd Report)

Error Compensation for the Ambient Temperature Change

Abstract

The study presents the improvement of the working accuracy by removing the error for an ambient temperature change, which affects the working accuracy largely. A machining center is newly developed, where various kinds of remedies are considered against the thermal deformation from the design stage. Further, in order to maintain the accuracy of the machine under more severe environment, a program is made to estimate the error due to the ambient temperature change and to modify numerical control commands. The error is decided from the temperature distribution on the machine and is replaced to the displacement of the spindle. The possibility of the error compensation for the ambient temperature change is confirmed by boring- and endmilling experiments, together with the geometrical error compensation.