Large-size end surface processing electric spindle for mixed support of hydrostatic bearing and rolling bearing

Abstract

The invention relates to a large-size end surface processing electric spindle for mixed support of a hydrostatic bearing and a rolling bearing. The electric spindle comprises a rotating shaft (6), double rows of cylindrical roller bearings (25), an extrusion oil film damper (27), an aligning ball bearing (18), a first static pressure thrust bearing (9), a first static pressure thrust bearing (10), a thrust disc (16), a rotor (14), a motor shell (7) and an upper shell (4), and is characterized in that the rotating shaft (6) is a stepped shaft, the aligning ball bearing (18) is arranged on the lower part of the rotating shaft (6), and an outer ring of the aligning ball bearing (18) is in clearance fit with the motor shell (7); and a large axial carrying capacity is obtained by the electric spindle, high-precision manufacture with the entire support of the hydrostatic bearing is avoided, the processing cost is reduced, and the service life of the rolling bearing is prolonged.

Description

technical field [0001] The invention relates to a large-size electric spindle for end surface processing supported by a mixture of static pressure bearings and rolling bearings, and belongs to the field of manufacturing equipment. Background technique [0002] Traditional motorized spindle rotor support methods mainly include rolling bearings and sliding bearings. Hydrostatic sliding bearings have the characteristics of large load capacity, high rigidity, low friction at low speed, low bearing heat generation, long life, and strong impact resistance. However, the oil supply system is relatively complicated, and the bearing manufacturing accuracy is relatively high. Suitable for mass production, generally suitable for larger specifications or high-precision machine tool spindles. [0003] Rolling bearings have been standardized and have excellent interchangeability and versatility. However, when working under high-speed and heavy-load conditions, the bearings suffer from sev...

AI Technical Summary

Problems solved by technology

[0004] Large-sized end-face machining electric spindles are urgently needed in the field of machine tools. If the spindle is fully supported by hydrostatic sliding bearings, since the bearing pad depends on the grinding process, the workload is large and the manufacturing cost is high, so it is difficult to achieve mass production; if rolling bearings are used, Due to large-size end face grinding, it is difficult to control the end runout of the grinding wheel within the ideal range, and the import cost of large-size, high-precision rolling bearings is high, so the use of pure rolling bearings cannot meet the requirements.

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