Journal
PRECISION ENGINEERING-JOURNAL OF THE INTERNATIONAL SOCIETIES FOR PRECISION ENGINEERING AND NANOTECHNOLOGY
Volume 60, Issue -, Pages 160-166Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.precisioneng.2019.07.011
Keywords
Thermal error; Ball screw; Compensation; CNC feed axis
Categories
Funding
- Polish National Center for Research and Development [N N502 280737]
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The article presents compensation of thermal errors of a computerized numerical control (CNC) axis. A partial differential equation (PDE) model of ball screw temperature distribution was utilized. The model takes into account non-steady-state localized heat sources and the effect of heat conduction between the screw and the machine body. To tune and validate the model, temperature distribution of the axis was measured on-line during its operation. The change of the model parameters related to the change of the axis movement velocity was presented. The article shows, that utilization of the thermal PDE model to compensate thermal errors, though effortful, is beneficial, but noticeably less accurate than the utilization of compensation based on the measured temperature values.
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