A dynamic and static pressure bearing of a grinding head of a high-speed roll grinder and a manufacturing method thereof

Abstract

The invention discloses a hybrid bearing of a high-speed roll grinder grinding head and a manufacture method thereof. According to the manufacture method, the bearing is cylindrical, the outer cylindrical surface of the cylindrical bearing is symmetrically provided with 3-6 ribbed plates, and meanwhile, a pit-shaped static pressure cavity is formed at the position of the each ribbed plate in the inner hole of the cylindrical bearing; an oil returning groove is formed between every two static pressure cavities in the inner hole of the bearing, the bearing is placed in a bearing sleeve, and the bearing sleeve can extrude each ribbed plate arranged on the bearing so that the inner hole of the bearing generates transformation so as to generate a wedge-shape dynamic pressure cavity; a cooling liquid inlet and a cooling liquid outlet are symmetrically formed in the cylindrical surface of the bearing sleeve, so that cooling liquid flows into the space between every two ribbed plates through a cooling liquid circulating hole so as to cool the bearing. The hybrid bearing provided by the invention has the advantages that the revolving speed is high, the working stability is good, the abrasion is small, the heat dissipation effect is good, the structure is simple, the construction cost is low, and the service life is long.

Description

technical field [0001] The invention relates to a dynamic and static pressure bearing of a grinding head of a high-speed roll grinder and a manufacturing method thereof, belonging to the technical field of the main shaft bearing of the grinding head of a roll grinder. Background technique [0002] At present, the bearings used on the grinding head spindle of the roll grinder include pure static pressure bearings, pure dynamic pressure bearings and dynamic and static pressure bearings. Since pure static pressure bearings require a high-power oil supply system, pure dynamic pressure bearings will There is friction, and the dynamic and static pressure bearing has the advantages of both the dynamic pressure bearing and the static pressure bearing, and has the advantages of large load capacity, high bearing rigidity, high speed, low power consumption, etc. most widely used. At present, in production practice, the dynamic and static pressure bearings widely used in the grinding h...

AI Technical Summary

Problems solved by technology

Although the dynamic and static pressure bearing of this structure in the prior art has overcome the shortcoming of pure static pressure bearing and pure dynamic pressure bearing, when the grinding wheel line speed is 45m / s and below, adopt existing this dynamic and static pressure bearing other The heat generated by the rotation between the shaft and the bearing can be dissipated effectively. However, when the linear speed of the grinding wheel exceeds 45m / s, the heat generated exceeds the limit of heat dissipation of the bearing, thus destroying the oil film and causing metal damage to the shaft and bearing. direct contact between the bearings will burn out quickly

The root cause of such a phenomenon is the structure of the hydrodynamic bearing itself in the prior art: the existing hydrodynamic bearing relies on the weight of the main shaft to homogenize the hydrodynamic oil film formed between the shaft and the bearing. It is not strong, and the dynamic pressure surface is too large, and the heat dissipation effect of the bearing is not good. Once the relative speed between the shaft and the bearing exceeds the rated speed, the dynamic pressure oil film will be destroyed due to insufficient heat dissipation. Therefore, this type of dynamic pressure Pressure bearings can only be used on ordinary roll grinders (the linear speed of the grinding wheel is lower than 45m / s) and are not suitable for high-speed roll grinders (the linear speed of the grinding wheel is higher than 45m / s but less than 150m / s)

Therefore, the use effect of the existing dynamic and static pressure bearings is still not ideal.

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