Static-pressure direct drive rotating table

Abstract

The invention relates to a static-pressure direct drive rotating table which comprises a base seat and a rotating plate, wherein the rotating plate is assembled on the base seat in a rolling mode through a static-pressure bearing, and the axial line of the rotating plate extends along an up-and-down direction. The static-pressure bearing is arranged in the middle part of the rotating plate. At least one circle of static-pressure bearing guide rail pair is arranged in the periphery of the static-pressure bearing between the base seat and the rotating plate. The static-pressure direct drive rotating table is small in processing amount of the rotating plate and large in axial bearing capacity.

Description

technical field [0001] The invention relates to mechanical processing auxiliary equipment, in particular to a static pressure direct drive rotary workbench. Background technique [0002] At present, large-scale CNC machine tools are developing in the direction of high speed, high precision, heavy load, and multi-axis linkage. Among them, the high-precision CNC rotary table is a key component of multi-axis linkage CNC machine tools, so the research on high-precision CNC rotary table technology is the focus of research competition in various countries, and it involves the development of national defense, precision machinery, electronics and other industrial technologies. [0003] The structure of the existing rotary table is "a direct drive static pressure rotary table" disclosed in the Chinese patent document CN 202200044 U. The stator of the motor and the bearing fixed ring of the hydrostatic bearing are fixedly assembled with the turntable housing. The rotor of the direct ...

AI Technical Summary

Problems solved by technology

But the existing problem of this kind of rotary table is that: the weight of the rotating disk and the axial force generated by the weight of the workpiece to be processed on the rotating disk are completely borne by the hydrostatic bearing, because the shaft of the hydrostatic bearing The axial bearing capacity of the rotating disk is limited, which limits the axial bearing capacity of the rotating disk surface, and also limits the rotating speed of the rotating disk surface. If the rotating speed of the rotating disk surface is slightly higher, the axial runout of the rotating disk surface will increase, which will affect the machining accuracy; at the same time, in order to realize The smooth rotation of the rotating disk surface, the entire bottom surface of the rotating disk surface is in full contact with a static pressure bearing moving ring with a large end surface area, which requires complete processing of the entire bottom of the rotating disk surface and the static pressure bearing moving ring, the processing volume of the rotating disk surface It is relatively large and difficult to process. At the same time, due to the large volume of the hydrostatic bearing, it is also difficult to process the hydrostatic bearing and the cost is also high. The resistance in the motion process of the hydrostatic bearing is eliminated, and the power demand for the direct drive motor is large; the rotor ring of the direct drive motor is arranged on the periphery of the rotating disk, and the distance between the rotor and the axis of the rotating disk is relatively long, and the rotor drives the rotating disk to rotate. During the process, it is easy to cause the jitter of the rotating disk surface, which affects the processing accuracy; the direct drive motor is installed on the periphery of the rotating disk surface, and it is easy to cause the direct drive motor to form electromagnetic interference to the outside

Images