Thermal And Dynamic Characterisics Anslysis And Experiment Rasearch Of High Speed Spindle

High speed machining technology leads to large amount of increase production meanwhile, improves product’s quality, with low cost. And the technology gets a big promotion in the production industry. As a key part of high-speed machine tools, high speed spindle has some advantage: high precision, small volume, fast dynamic response, low energy loss etc. The spindle is directly connected to cutting tools, the characteristics of spindle directly affects the machining quality, so the research of the thermal characteristics and the change of the structure high speed spindle caused by heat has significant importance to extended the life, precision and dynamic characteristic.Finite element model is established by Workbench of ANSYS platform in the paper, based on DGZ-60 E high-speed grinding spindle. With the use of ball bearing thermal analysis software based on quasi statics calculation, calculates the heat of motorized spindle, then a preliminary motorized spindle thermal analysis of finite element model is established according to the other thermal boundary conditions based on heat transfer theory, and then takes consideration of the motorized spindle structure changes which caused by the thermal deformation, after iterative calculation, the temperature field of thermal-structure coupling is calculated. And then analyzes the motorized spindle’s thermal field distribution characteristics of different speed, cooling water flow rate and cooling water of initial temperature, try to improve the electric spindle’s temperature field by ventilation in the hole of spindle or oil-gas lubrication system.Using the rolling ball bearing performance prediction system to analysis the static and dynamic characters of bearing: bearing life of different temperature field, bearing’s dynamic stiffness with the influence of thermal deformation, the dynamic stiffness on the effect of rotational speed. Then the finite element analysis model based on the dynamic rigidity of the bearing is used to calculate spindle’s natural frequency, and then consider the temperature’s influence, the adjusted first-order natural frequency is calculated. And harmonic response analysis is done for the spindle, and the dynamic stiffness is recalculated based on the temperature. Increase number of disc spring or reduce the disc spring’s stiffness, to improve the spindle’s dynamic stiffness.Using device to design the corresponding experimental test platform to build DGZ-60 E motorized spindle thermal test platform, to test temperature of different heat, cooling water flow rate and different initial temperature of cooling water. The modal test of spindle under different thermal condition is carried out. Analysis the results.