Predicting spindle displacement caused by heat using the general regression neural network

• Published in: International journal of advanced manufacturing technology 2019-10, Vol.104 (9-12), p.4665-4674
• Main Authors: Jian, Bo-Lin, Wang, Cheng-Chi, Hsieh, Chin-Tsung, Kuo, Ying-Piao, Houng, Mao-Chin, Yau, Her-Terng
• Format: Article
• Language: English
• Subjects: Boundary conditions; CAE) and Design; Computer simulation; Computer-Aided Engineering (CAD; Deformation mechanisms; Engineering; Error analysis; General regression neural networks; Industrial and Production Engineering; Machine tools; Mechanical Engineering; Media Management; Multiple regression analysis; Neural networks; Numerical controls; Original Article; Regression analysis; Room temperature; Thermodynamic properties; Trial and error methods
• ISSN: 0268-3768; 1433-3015
• DOI: 10.1007/s00170-019-04261-5

Machine tools may be affected by room temperature, the heat generated by the process, and many other factors. These cause the temperature of the spindle, motor, lead screw, and other parts to rise, and this causes thermal deformation. The main purpose of this study was an exploration of the relationship between the temperature of the spindle and thermal deformation. Measurements were made of the increases in temperature of a CNC lathe spindle, and the related axial displacements involved, at spindle speeds of 1000, 2000, and 3000 rpm. Multiple regression analysis and a general regression neural network were used to establish the relationship between thermal deformation and temperature change individually. The results showed the coefficient of determination of the multiple regression analysis to be 0.9275, while the general regression determined by the neural network was 1. The fitting result of the regression neural network was better than that of multiple regression analysis, and the maximum error was less than 0.1 μm. In addition, this study also used COMSOL simulation analysis software to analyze features of the thermal behavior generated by the spindle structure. A trial and error method was used to adjust the boundary conditions. Results showed that the maximum error in temperature rise determination of simulation and experiment was less than 1 °C.