What are the performance requirements for the spindle bearings when using grease?

1, good lubricity

In order to maintain a uniform oil film between the main shaft and the bearing contact surface, and the oil film is not damaged when the main shaft starts or stops moving, the oil film is not damaged, maintaining good lubrication performance, reducing friction and friction heat, and reducing the temperature rise of the main shaft. To ensure the processing accuracy, the oil is required to have good lubricity.

(4) Good rust resistance

Because the oil will inevitably mix into the condensed water in the air or the machine coolant during the working process of the spindle lubrication system, the oil is required to have good rust resistance, especially in the hot and humid climate in the south, especially pay attention to its rust prevention. Sex.

(3) Good oxidation resistance

The main sleeve of the machine tool is in the form of circulating lubrication. It is required that the spindle bearing oil will not be used for a long time, and will not block the oil passage and the bearing gap due to the generation of mud, and produce small corrosion effect. Therefore, the oil product is required to have good oxidation stability, and the industrial standard requires the oxidation stability of the oil. The indicator is 1000h ((GB/T, 12581).

(1) Suitable strength and good temperature characteristics

In order to use the machine's main uranium temperature is not too high, the machine tool will be thermally deformed, affecting the machining accuracy or making the bearing poorly lubricated. The oil well should be selected according to the spindle bearing structure, the rotational speed and the bearing clearance. The temperature characteristic prevents the change of the teaching degree from being too large and affects the lubrication performance due to the large change in the operating temperature of the spindle and the ambient temperature.

Bearings are an important part of contemporary machinery. Its main function is to support the mechanical rotating body, reduce the friction coefficient during its movement, and ensure its rotation accuracy. Bearings need to be kept lubricated at high speeds. It is necessary to lubricate the grease in time to ensure the normal operation of our machines and to extend the service life of the spindle bearings.