Ball screw end support bearing arranging structure of high-speed feed shaft

Abstract

The invention relates to a bearing arranging structure of a feed shaft of a numerical control machine tool, in particular to a ball screw end support bearing arranging structure of a high-speed feed shaft. The ball screw end support bearing arranging structure is mainly used for transmission of a high-speed machine tool linear feed shaft driven by a ball screw. Four plus two or more sets of precise thrust angular contact ball bearing combinations are adopted in the support of a power input end, and three or more sets of precise thrust angular contact ball bearing combinations are adopted in the support of a non-power end. Special precise thrust angular contact ball bearings for the screw and with the nominal contact angle alpha being 60 degrees are adopted as precise thrust angular contact ball bearings. A high-strength disc spring preload is installed at the non-power end of the screw. The special precise thrust angular contact ball bearings for the screw and with the nominal contact angle alpha being 60 degrees are adopted, the larger the number of bearing steel balls is, the higher the axial rigidity becomes compared with ordinary angular contact bearings, the starting torque is small, and the low-driving-force and high-precision running is achieved. The axial bearing force of the bearings is greatly improved, and the service life of the bearings is greatly prolonged. The machining precision and stability of a high-speed machine tool are improved.

Description

technical field [0001] The invention relates to a bearing configuration structure of a feed shaft of a numerically controlled machine tool, in particular to a ball screw end support bearing configuration structure of a high-speed feed shaft, which is mainly used in the linear feed shaft transmission of a high-speed machine tool driven by a ball screw. Background technique [0002] Traditional CNC machine tool screw feed shafts mostly use multiple sets of ordinary angular contact ball bearings, or a combination of deep groove ball bearings and thrust ball bearings. However, when applied on high-speed machine tools, this type of configuration has problems such as poor axial resistance, difficult control of axial preload, and insufficient support rigidity of the screw. The traditional CNC machine tool screw feed shaft, the supporting bearings at both ends of the screw mainly have three types of configuration forms. The first type uses ordinary angular contact ball bearings or ...

AI Technical Summary

Problems solved by technology

On high-speed feed machine tools, the above-mentioned configurations all have shortcomings. The first type of configuration with angular contact balls has poor axial bearing capacity, and the high-speed performance of tapered roller bearings is poor; the second type has large axial dimensions and poor high-speed performance. Poor; the third category is suitable for medium and low speed and heavy load conditions

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