In order to adapt to different proc

In order to adapt to different processes, all kinds of workpiece materials and cutting tools and other cutting process requirements, the spindle must have a certain range of speed and achieve stepless speed, in order to ensure the selection of reasonable machining parameters, so as to obtain the best cutting efficiency, machining precision and surface quality; The index of speed range is mainly determined by the requirement of the minimum speed and the maximum speed of the spindle. At present, the machining center spindle basically realizes stepless speed change. The prominent feature of the machining center is the automatic tool changing function. In order to ensure the continuous implementation of the machining process, the machining center spindle system must have the automatic tool clamping function compared with other spindle systems. 3. The spindle positioning function requires the spindle quasi-stop function, also known as the spindle positioning function, that is, when the spindle stops, control the spindle to stop in a fixed position, which is necessary for automatic tool change. In automatic tool change, the cutting torque is usually transmitted by the end face key of the tool rod, which is the function that requires the spindle to accurately position at a specific Angle on the circumference.