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Rotation Accuracy, Dynamic And Static Stiffness, Speed Adaptability
Jul 09, 2018

A mechanical spindle refers to the axis on the machine that drives the workpiece or the tool to rotate. The main shaft components are usually composed of a main shaft, a bearing and a transmission member (gear or pulley). In the machine is mainly used to support transmission parts such as gears, pulleys, transfer motion and torque, such as machine tool spindles; some are used to clamp workpieces, such as mandrels.

A mechanical spindle refers to the axis on the machine that drives the workpiece or the tool to rotate. The main shaft components are usually composed of a main shaft, a bearing and a transmission member (gear or pulley). In the machine is mainly used to support transmission parts such as gears, pulleys, transfer motion and torque, such as machine tool spindles; some are used to clamp workpieces, such as mandrels. Most machine tools have spindle components, except for planers, broaching machines, etc., where the main motion is linear. The motion accuracy and structural rigidity of the spindle components are important factors in determining the machining quality and cutting efficiency. The indicators that measure the performance of the spindle components are mainly the accuracy of rotation, stiffness and speed. 1 Rotational accuracy: The radial and axial runout (see geometrical tolerance) that occurs in the direction of the machining accuracy when the spindle rotates is mainly determined by the manufacturing and assembly quality of the main shaft and the bearing. 2 Dynamic and static stiffness: mainly determined by the bending stiffness of the main shaft, the stiffness and damping of the bearing. 3 speed adaptability: The maximum speed and speed range allowed are mainly determined by the structure and lubrication of the bearing, as well as the heat dissipation conditions.

To reduce the operating temperature of the bearing, the usual method is to use lubricating oil. Lubrication methods include oil and gas lubrication and oil circulation lubrication. Pay attention to the following points when using these two methods:

1. When using oil circulation lubrication, ensure that the oil volume of the spindle constant temperature tank is sufficient.

2. The oil and gas lubrication method is just the opposite of the oil circulation lubrication. It only needs to fill 10% of the bearing space capacity.

The advantage of the circulating lubrication is that friction heating can be reduced while the lubrication is satisfied, and a part of the heat of the spindle assembly can be absorbed.

There are also two types of lubrication for the lubrication of the main shaft: oil mist lubrication and injection lubrication.


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