Lightweight noise lubrication maintenance of electric spindle bearings

When the raceway of the electric spindle bearing is running, the continuous sound emitted by the rolling element rolling on the raceway surface is generally the unique sound that all the electric spindle bearings will produce. The general bearing sound is the rolling sound plus other sounds. The ball bearing's raceway sound is irregular, the frequency is above 1000Hz, its main frequency does not change with the speed, but its total sound pressure level increases with the increase of the speed. For bearings with large rolling sounds, the sound pressure level of the raceway sound decreases with the increase of viscosity; while for bearings with small raceway sound, the sound pressure level decreases when the viscosity increases to about 20 mm2/s or more. For the increase. The greater the rigidity of the bearing housing, the lower the total sound pressure level of the raceway sound. If the radial clearance is too small, the total sound pressure level and main frequency of the raceway sound will increase sharply as the radial clearance decreases. The method for controlling the rolling sound is to select a low-noise electric spindle bearing, that is, a bearing with a small waviness, and carefully select the conditions of use. The raceway sound often affects the noise of the entire machine, and reducing the raceway sound can reduce the noise of the entire machine.
Impact sound of rolling element and its control method When a larger type of ball bearing or cylindrical roller bearing runs at low speed under pure radial load, the rolling element in the non-loading zone will impact the cage due to the small centrifugal force of the rolling element. Or the raceway makes noise. But as the speed increases, the sound will disappear. The control methods for the impact sound of the rolling element are: appropriately reducing the radial clearance, and using the electric spindle bearing of the cage having a reasonable structure and a flexible material.
When the electric spindle bearing rotates, the bearing wears and fails due to frictional resistance. The resistance to the rotation of the electric spindle bearing is composed of rolling friction, sliding friction and lubricant friction. Rolling friction occurs when the rolling elements roll on the bearing raceway; sliding friction occurs on the guiding surface of the rolling body in the cage, the rib guiding surface of the cage, and the roller end face and the ferrule rib in the roller bearing; lubrication The friction of the agent consists of the internal friction of the lubricant at the contact and the agitation and extrusion of the lubricant. Therefore, the resistance of the impedance bearing movement is the sum of the above three frictions. The purpose of lubrication is to avoid the direct contact between the raceway, the rolling element and the cage metal through the grease and its lubrication method, and reduce the frictional heat to minimize the frictional resistance, thereby reducing wear, preventing corrosion and prolonging its use. life.
About 80% of the bearings are lubricated with grease. There are many types of bearings that are sent to the user after being greased in the bearing factory. Therefore, some people refer to grease as the fifth largest part of the bearing's inner ring, outer ring, rolling element, and cage. Explain the importance of grease to bearings.

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