Combined metal cutting machine tool spindle

Abstract

The invention discloses a combined metal cutting machine tool spindle. The combined metal cutting machine tool spindle comprises a spindle body, bearings, a shaft body and a spacer ring connected withthe bearings in a matched mode. The bearings are closely connected with the spindle, and the outer sides of the bearings are covered with the shaft body. Elastic workpieces used for generating elastic prepressing are connected to outer rings of the bearings. The elastic workpieces are arranged on the outer side of the spacer ring. The spacer ring is arranged between the spindle and the shaft body. Compared with the prior art, regardless of low speed or high speed, the spindle can keep tight pressing on the bearings, disappearance of prepressing force of the bearings can be avoided, the rotation precision of the metal cutting machine tool spindle can be effectively improved, the spindle is protected against displacement during operation, and the machine tool machining precision can be improved.

Description

technical field [0001] The invention relates to the field of machine tool accessories, in particular to a composite metal cutting machine tool spindle. Background technique [0002] For metal cutting machine tools, there are high equipment requirements for its main shaft and bearings. At present, the spindle bearings of machining centers on the market are generally based on rigid preloading or elastic preloading alone: ​​if the spindle bearings only use rigid preloading technology, when the spindle is working, due to the temperature rise of the spindle, thermal expansion will occur. long, and the thermal elongation is generally greater than that of other parts, resulting in the original pre-pressure on the bearing becoming smaller or even zero, which reduces the rotation accuracy of the spindle and causes movement during work; on the other hand, if the spindle bearing is simple When the elastic preloading technology is used, when the spindle is at low speed and large margin...

AI Technical Summary

Problems solved by technology

At present, the spindle bearings of machining centers on the market are generally based on rigid preloading or elastic preloading alone: ​​if the spindle bearings only use rigid preloading technology, when the spindle is working, due to the temperature rise of the spindle, thermal expansion will occur. long, and the thermal elongation is generally greater than that of other parts, resulting in the original pre-pressure on the bearing becoming smaller or even zero, which reduces the rotation accuracy of the spindle and causes movement during work; on the other hand, if the spindle bearing is simple When the elastic preloading technology is used, when the spindle is at low speed and large margin cutting, due to the large cutting force, compared with the rigid preloading, the rigidity of the elastic preloading is weak, and the rotation accuracy of the spindle will also be reduced.

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