Research On Thermal Performances And Interrelated Technologies Of Hydrostatic Motorized Spindle With Heat Pipes

Manufacturing industry is the base of country economy; it makes useable resources translate into consumer goods. Fortune from manufacturing is about 60~80% of human society fortune. Manufacturing industry experiences handwork and machine, the production efficiency is improved; the applications of CNC MC FMC FMS resolve automatic tool change, automatic disassembly problems, shorten assistant time, make production quality and efficiency advanced, and the corporations gain remarkable benefit. All the technologies mentioned is to shorten assistant time, which arrive at a limit. Only reducing machining time of single part, the production efficiency could be a leap again; high speed machining is the exclusive way.Motorized spindle is an incorporate cell of principal axis and motor, which is the best choice of high speed machining. Motorized spindle is equipped with a built-in motor, stator with cooling grooves assembled in shell, rotor and principal axis incorporated. The speed is controlled by adjusting frequency. Motorized spindle combines multi-technologies. Compared with overseas motorized spindle; ours has some gap in power, speed and life. Designing of thermal performance is key, traditional cooling is designed by cooling grooves with air or water, the diathermanous effect depends on cooling areas and fluid speed. Machining, seal and assemblage enhance complexity of motorized spindle structure. Heat pipes have merits of high conduction and excellent equal-temperature; deep the dissertation is lucubrated on motorized spindle thermal performances of motorized spindle with heat pipe.Hydrostatic motorized spindle is designed, hydrostatic bearings are chosen for its high friction power, and the heat problem is prominent, so the study is representative. Static, dynamic, harmonic and thermal analysis should be considered with Motorized spindle designing.Thermal model of hydrostatic motorized spindle is mathematic base; detail analysis is done from heat resources and diathermanous ways. Power of motor wastage and bearings friction are mainly heat resources; shell surface of motorized spindle, cooling grooves, flow of hydrostatic bearings, and so on are mostly diathermanous ways; the expression of them are concluded. Thermal model of hydrostatic motorized spindle is established.Geometry character, material and structure of wick, diathermanous and cooling power are put forward as heat pipe capability parameters. Equivalent thermal conductivity model of heat pipe is founded to resolve obstacle in finite element analysis, and which is correct by experiment validating. Fin diathermanous efficiency is also concluded and approved right by experiment.Finally, average temperature of hydrostatic bearings, maximum temperature of motor, thermal distortion in front end, time of reaching thermal stabilization is brought forward as evaluation parameters of thermal performances for motorized spindle. Water cooling can better improve thermal performances in lowering temperature of bearings and motor, reducing thermal distortion and thermal stabilization time compared with air and oil cooling. Only by air cooling, motorized spindle with diathermanous heat pipes can realize such effect, so heat pipe is high efficiency in diathermanous course. Analogical experiment of heater with diathermanous heat pipe approves the effect. Diathermanous application of heat pipe really can lower temperature of analytic object, and reduce time of reaching thermal stabilization.