The spindle precise positioning function (also known as the spindle precise positioning function) is to manipulate the spindle to stop at a fixed position when it terminates. The quasi stop command is M19. The reason for setting a quasi stop depends on its application, and the key application is:
1) Tool change control of machining center: Its function is to accurately stop the spindle on a fixed and unchangeable axial position every time, to ensure that the inner hole key on the spindle can point to the key groove on the barrel clamp during fully automatic tool change. At the same time, it ensures that the relative position between the barrel clamp and the spindle does not change during each tool change, improving the precision of repeated installation of CNC blades and thus improving the consistency of the diameter during hole production and processing.
Application of spindle quasi stop function in machining centers
2) In places such as precision milling and tool retraction in machining centers: such as when boring coaxial large holes in the inner cavity based on small circular holes on the anterior wall of the uterus, or when carrying out production processing such as reverse angles, it is also stipulated that the spindle completes the accurate stop, so that the sharp knife stops in a fixed direction, which facilitates the spindle to be offset to a certain specification. After that, the machining center allows the large cutting edge to enter the box body according to the small circular holes on the anterior wall of the uterus to perform boring on the large holes. Principle: The quasi stop device is installed at the end of the spindle, and the coarse positioning plate is tightened with screws on the precise positioning plate. When the machining center stops, the spindle is stopped. The spindle is in operation before the quasi stop.
The spindle of the machining center runs → CNC sends out a parking command → The spindle rotates at low speed (20r/min) → Delay relay delayed for a period of time → Connect the contactless switch power supply → When the magnetic induction block in the rough positioning plate opens the contactless switch → The main motor rotates and cuts off the main transmission gear → The main shaft rotates again due to inertial force → The contactless switch data signal sends a signal to the hydraulic system at the same time → The right chamber of the hydraulic system is filled with liquid → The fixed piston rod is offset → The roller bearing flips on the precise positioning plate → The groove wheel mechanism is stuck.
