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The electromechanical components of the CNC machine feed drive mechanism mainly include: servo motor and detection component, speed reduction mechanism, ball screw nut pair, screw bearing, moving parts (workbench, headstock, column, etc.). Here, the maintenance and maintenance of the ball screw nut pair will be explained.
(1) Adjustment of the axial clearance of the ball screw nut
In addition to the requirements for the accuracy of the feed motion in a single direction, the ball screw nut pair also has strict requirements on the axial clearance to ensure the reverse transmission accuracy. Therefore, in operation and use, it should be noted that the axial clearance caused by the wear of the screw nut pair is eliminated by the adjustment method.
The structure of this type is simple and reliable, the rigidity is good, and the application is the most extensive. The form of the gasket between the double nuts can be adjusted in advance by the professional manufacturer according to the user's requirements, and the use of the fashion unloading is very convenient.
The external thread on one nut is used to adjust the relative axial position of the two nuts by the round nut to realize the pre-tightening. After the adjustment, the other round nut is used for locking. This structure is convenient to adjust and can be adjusted at any time during use. However, the preload force cannot be accurately controlled.
Cylindrical external gears are respectively formed on the flanges of the two nuts, respectively meshing with the inner ring gears fastened at both ends of the sleeve, and the number of teeth is respectively Z1 and Z2, and one tooth is different. When adjusting, first remove the inner ring gear, let the two nuts rotate one tooth in the same direction with respect to the sleeve, and then insert the inner ring gear, then the two nuts will produce relative angular displacement.
(2) Daily inspection of sealing and lubrication of ball screw nut pair
The daily inspection of the sealing and lubrication of the ball screw nut pair is a problem we should pay attention to during operation. For the sealing of the screw nut, it is necessary to check the sealing ring and the protective cover to prevent dust and impurities from entering the ball screw nut pair. For the lubrication of the screw nut, if grease is used, it should be lubricated regularly; if lubricating oil is used, be careful to always fill the oil through the oil hole.
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