What are the requirements of cnc machining on the structure of the electric spindle?

Electric spindle is a new technology that integrates machine tool spindle and spindle motor in the field of CNC machining in recent years. Together with linear motor technology and high-speed tool technology, it will push high-speed machining to a new era. The CNC machining electric spindle is a set of components, which includes the electric spindle itself and its accessories: electric spindle, high frequency frequency conversion device, oil mist lubricator, cooling device, built-in encoder, and tool change device.

High-speed spindle is an important key technology of high-speed cutting technology, and also an important part of high-speed cutting machine tools. It requires high dynamic balance, good rigidity, high rotation accuracy, good thermal stability, sufficient torque and power transmission, high centrifugal force, accurate temperature measurement device and efficient cooling device. High-speed cutting generally requires that the spindle speed capacity is not less than 40,000r/min and the spindle power is greater than 15kW. Usually, the spindle motor integrated with the spindle motor is used to achieve direct transmission without intermediate links. Most of the motors use induction integrated spindle motors.

At present, many machined parts manufacturers use hot-pressed silicon nitride (Si3N4) ceramic bearings, hydrodynamic and static pressure bearings and air bearings. According to the different types of machined parts, the structural requirements of the electric spindle are very strict. Lubrication mostly uses oil-air lubrication, jet lubrication and other technologies. Spindle cooling generally adopts water cooling or air cooling inside the spindle.

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