As people have higher and higher requirements for machining accuracy of mechanical equipment, rotary table machine is inseparable from machining industries such as electronics, automobiles, washing machines, and medical devices. The rotary table machine spindle is an important part of the spindle assembly. The structure size switch, manufacturing accuracy, material and heat treatment of rotary table machine spindle have a great impact on the performance of the entire spindle assembly and even the main drive system. Although different types of rotary table machines use different spindle types, in general, rotary table machine spindle system has the following four types.

1. Main drive with change gear

The rotation of the spindle motor is reduced by the change gear, and the output torque is increased to meet the requirements of the output torque characteristics at the low speed of the spindle. The movement of the sliding gear is mostly achieved by the hydraulic cylinder plus pulling, or directly by the hydraulic cylinder.

2. Main transfer via belt drive

The spindle motor is driven by belt or synchronous gear belt, without gears, thus avoiding vibration and noise caused by gear transmission. This type is suitable for spindles with high speed, low torque and other characteristics.

3. Double motors drive the spindle respectively

At high speed, the spindle is directly driven by the belt to rotate; At low speed, another motor drives the spindle to rotate through the gear drive, and the gear takes off and lands speed and expands the transmission range. In this way, the constant power area is increased, and the defects of insufficient torque and insufficient utilization of motor power at low speed are overcome.

4. Motor and spindle integrated transmission

This type of spindle is usually called the electric spindle, the motor itself is the spindle. This main transmission mode greatly simplifies the structure of the spindle box and the spindle, and improves the stiffness of the spindle components, but the spindle output torque is small, and the motor heating has a greater impact on the spindle. Many spindles of CNC grinding machines are in this way, and the speed can reach tens of thousands of revolutions per minute. Generally, this kind of spindle motor is cooled by circulating water cooling system.

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