There are many kinds of faults in the ball screw, and there is no fixed mode. Some fault is gradual failure, there must be a process of development, with the increasing use of time more and more serious; sometimes the sudden failure, generally do not have obvious signs of sudden, this failure is various unfavorable factors and external interaction generated. Therefore, the correct test to determine the cause of the real fault is the premise of fast and accurate maintenance.
1）Inspection and repair of clearance between ball screw nut pair and support system
When a CNC machine tool reverse error and high positioning accuracy, unstable quadrant marks, the first to detect screw system there is no gap. Detection methods: indicator with the ball on the end of the center hole of screw, screw axial measurement, another piece of dialgauge measuring worktable. The rotation of the screw, observe the two block on the dial indicator shows, according to the change of different values confirm the fault location.
2）The bearing, lead screw and nut are badly lubricated
Machine tools such as noise and vibration in the work, in the detection of the mechanical transmission part is no problem, we must first consider the problem of bad lubrication, many machine after years of operation, the screw nut automatic lubrication system often blocked, not automatic lubrication. It is possible to solve the problem by adding high temperature and high speed grease to the bearings and nuts. Grease ensures the normal operation of bearings and nuts for several years.
3）servo motor drive problem
Some machine tools produce vibration and crawl in the movement, and often detect the mechanical parts without any problems. No matter how to adjust, vibration and crawl can not be eliminated. After careful examination, it is found that the servo motor drive gain parameter is not suitable for actual operation. After adjusting the gain parameters, vibration and creep can be eliminated.
