Thermal Characteristic Optimization of a CNC Forming Gear Grinding Machine

With the development of CNC machine tool technology, the proportion of errors caused by geometric errors, tool wear and servo control is gradually reduced. However, the error caused by machine tool thermal deformation is up to 40% -70%. Therefore, reducing the thermal error of machine tools has become a key problem to further improve the machining accuracy. The coolant has significant effects on the machine tool thermal characteristics. This is because coolant absorbs cutting heat and then splashes on the key components such as bed, column and rotary table. In order to improve the thermal rigidity of the CNC forming grinding machine, the coolant spraying layout is optimized based on the weakness analyses of the machine tool thermal performance in this paper. The numerical calculation results show that the coolant spray layout is improved by the thermal structure symmetrical design. The machine tool temperature gradient in all directions is reduced after coolant spraying layout optimization. The thermal deformation of the key points is maximized reduced about 73.4 %.