High-accuracy sleeve main shaft structure for machine tool

Abstract

The invention provides a high-accuracy sleeve main shaft structure for a machine tool, which prevents a bearing from deflection during preloading, ensures the running accuracy of a main shaft, and further ensures the high accuracy of the sleeve main shaft. The high-accuracy sleeve main shaft structure for the machine tool comprises the main shaft and a sleeve, wherein the main shaft penetrates through the sleeve and is supported at the inner sleeve wall via a front-end bearing and a back-end bearing, the front end part of the main shaft is embedded and sleeved at the front end part of the sleeve, and a back end press cover is arranged at the back end part of the sleeve; and the high-accuracy sleeve main shaft structure for the machine tool is characterized in that the back end of the main shaft is sleeved with a back end oil press sleeve, the back end oil press sleeve is in interference fit with the back end of the main shaft, the inner end surface of the back end oil press sleeve is in close contact with the back-end bearing, the external circular surface at the outer end of the back end oil press sleeve is in close contact with the internal circular surface of the back end press cover, the front end of the main shaft is sleeved with a front end oil press sleeve, the front end oil press sleeve is in interference fit with the front end of the main shaft, and one end surface of the front end oil press sleeve is in close contact with the front-end bearing.

Description

technical field [0001] The invention relates to the technical field of the spindle structure of machine tools, in particular to the high-precision sleeve spindle structure of machine tools. Background technique [0002] The pretightening of the sleeve spindle structure of the existing machine tool is nut pretightening. Due to the thread processing technology, it is difficult for the working end surface of the pretightening nut to be perpendicular to the rotation center of the spindle, which will make the bearing skew during pretightening, thus affecting to the rotational accuracy of the spindle, resulting in a decrease in the accuracy of the quill spindle. Contents of the invention [0003] In view of the above problems, the present invention provides a high-precision sleeve spindle structure of a machine tool, which prevents the bearing from skewing during preloading, ensures the rotation accuracy of the spindle, and further ensures the high precision of the sleeve sp...

AI Technical Summary

Problems solved by technology

[0002] The pre-tightening of the sleeve spindle structure of the existing machine tool is nut pre-tightening. Due to the thread processing technology, it is difficult for the working end surface of the pre-tightening nut to be perpendicular to the rotation center of the main shaft, so that the bearing will be skewed during pre-tightening, thus affecting to the rotational accuracy of the spindle, resulting in reduced accuracy of the quill spindle

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