Motorized spindle device supported by high-speed hybrid bearings and lubricated by two phases of gas and liquid

Abstract

The invention discloses a motorized spindle device supported by high-speed hybrid bearings and lubricated by two phases of gas and liquid. The motorized spindle device comprises a shell, a cooling water jacket, a motorized spindle, a motor stator, a motor rotor, a front bearing, a rear bearing and a gas thrust bearing, wherein the cooling water jacket is fixed on the inner side of the shell, and the front and rear bearings support the two ends of the motorized spindle. Both of the front and rear bearings supporting the motorized spindle are hybrid sliding bearings and can promote the rigidity and the stability of the spindle and reduce temperature rise. Front and rear annular water return grooves are respectively formed in the two ends of each bearing, and lubricating medium liquid flows into the annular water return grooves and then flows out of the shell through a shell water outlet channel. Two gas seal devices are respectively arranged on two sides of each hybrid bearing and can prevent the lubricating medium liquid from flowing into the clearance between the motor stator and the motor rotor and flowing out of the shell along the axial direction of the motorized spindle. According to the gas thrust bearing, gas is used as the lubricating medium of the thrust bearing, and the gas thrust bearing provides the motorized spindle with axial rigidity and controls the axial displacement and the stability of the motorized spindle.

Description

technical field [0001] The invention belongs to the field of machine tool equipment manufacturing, and in particular relates to an electric spindle device supported by a high-speed dynamic and static pressure bearing using gas-liquid two-phase lubrication. Background technique [0002] Due to its high production efficiency, high processing quality and low processing cost, high-speed cutting has been rapidly applied in aviation, aerospace, automobile, mold and other industries in recent years. As the core component of the high-speed cutting machine tool system, the high-speed electric spindle device has a very important influence on the performance of the high-speed machine tool. High-speed bearings are the core technology of high-speed spindle unit design. The performance of high-speed bearings largely affects the rotation accuracy, cutting rigidity, service life and reliability of high-speed machine tool spindles. [0003] At present, the bearings used in high-speed machin...

AI Technical Summary

Problems solved by technology

Among them, domestic ceramic ball bearings have a short service life and limited load capacity; electric spindles supported by air bearings and magnetic suspension bearings can run continuously at high speeds for a long time, but the rigidity of the supporting spindles is low, and it is difficult to operate under high load conditions. next work

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