School of Manufacturing Science and Engineering, Sichuan University, Chengdu, China

---

Abstract—Since the thermal error modeling of CNC machine tools has characters of small sample and discrete data, the variable-weight combined modeling method was presented by integrating time series analysis and least squares support vector machines. Taking minimum sum of error square of prediction model as the optimization criterion, optimal weights in different time were calculated. Using grey GM (1, 1) model to predict the variable weights, the prediction result of thermal error was obtained as well. Application of the grey variable-weight combined model on a five axis vertical machining center indicated that it can get higher prediction accuracy than single modeling method. Therefore online error compensation to CNC machine tools will become more effective.

Index Terms—Numerical control machine tools, thermal errors, combination prediction, grey forecast, variable weight.

[PDF]

Cite: Zhiming Feng and Guofu Yin, "Variable-weight Combination Prediction of Thermal Error Modeling on CNC Machine Tools," Journal of Computers vol. 9, no. 11, pp. 2616-2620, 2014.