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Failure problems of ball screw nut

release time:

2019-11-14 17:30

Ball screw jack particularly adopts ball screw as the threaded rod, which easily got damaged while improper use.

Ball screw: the optimal part for the transition of rotational & linear motion, features as balls inside spiral flute of nuts (as a intermediate driving element), such screw could effecti-vely reduce the friction.

01 Particles of debris enter the ball track

Debris during processing accidentally enter the ball track during installation, if there is no wiper equipped, debris of workpiece will easily block the track and cause the improper lifting and running, wear screw and steel ball, which makes the greatly reduce of precision.

For shippment, most of the pasts are fixed in wooden boxes with foaming. If packaging is not careful, some wood chips or foam chips will inevitably enter the ball nut, causing the steel balls to slide poorly or directly jam.

02 Material for the ball

The most common material for steel balls in nuts is chrome molybdenum steel. The ball screw has different efficiency in temperature if lubricant adpoted. This rise temperature may cause broken even damaged, thus cause the damage to the nut or the screw groove. It is necessary to timely lubricate screw jacks.

03 The ball falls out of the nut

As is known to all, the ball screw jack can not be subjected to lateral force during operati-on. When the lateral force occurs, the screw rod will compete with the nut, then a gap would be exsits between the nut and screw over time, so the steel ball falls from the nut.

04 Improper installation of bearings

If the bearing is mounted on a ball screw and they are not properly fitted, a backlash would be occured as the axial load. This may be caused by the longer or shorter screw shou-lder.

Poor perpendicularity between the bearing surface and the V-shaped shaft of the locking nut, or thePoor parallelism of the locking nut surface in the corresponding direction, woul-d torture the bearing to tilt. Therefore, the V-shaped locking nut of the shoulder must be processed simultaneously with the bearing surface, then, the perpendicularity could be fixe-d, but the better way for processing is grinding.

To solve that problem, secure the bearing with two locking nuts with a spring cushion to prevent loosening during operation.