Research On Key Technologies Of Direct Drive Workpiece Spindle For Gear Hobbing Machine

In recent years, some modern processing technologies such as"dry cutting", "high speed cutting", "high precision cutting", "hard gear cutting", etc. entered gear cutting filed, which caused traditional NC machine was difficult to meet the demands, so direct drive technology had become necessary for the gear cutting machine.Putting gear hobbing machine which was used widely as the object of study, and the direct drive functional part as the core, the key theories and technologies of the machine designing/manufacturing were studied deeply and systemically. Development of gear hobbing machine prototype based on direct-drive functional part, at high-speed and high-precision was succeed.Direct drive workpiece spindle was a core functional part for gear hobbing machine. The key technologies of direct drive workpiece spindle is studied deeply and systemically. Details of studies were as follows,1.Studied torque motors used by direct drive workpiece spindle. The study include not only the comparison among DC torque motor, AC asynchronous torque motor and AC synchronous torque motor, but also the comparison between frameless toque motor and housed toque motor. Studied design technologies for dynamics parameter of direct drive spindle. Summarized design process for dynamics parameter of direct drive workpiece spindle.2. The key design technologies of direct drive workpiece spindle were studied deeply. Design and analysis of direct drive workpiece spindle were accomplished,with the considering of performance require.3. Discussed methods for studying static characteristics of spindle. Discussed theory of FEM and basal idea of software ANSYS. Founded FEM modeling for structural analysis of direct drive workpiece spindle. Studied static characteristics of direct drive workpiece spindle. The result showed that the increase of stiffness for bearings, especially front bearing was good for the increase of stiffness for spindle. The influence that bearings span on stiffness for spindle was bidirectional. There was a best point for bearings span, which made the stiffness strongest. The stiffness would decreased much more when bearings span was under best point than beyond the best point.4. Studied dynamic stiffness for spindle and its influencing factor. Founded FEM...