Large cnc machining plant for the use of semi-closed-loop servo system cnc machining center, the existence of backlash will affect the positioning accuracy of the machine tool and repeat positioning accuracy, resulting in unstable machining accuracy, will lead to processing parts round is not round enough, square is not square enough, there is always contour error.
First, the first mechanical adjustment, first tighten the screw lock nut, whether the screw shaft end coupling locking taper sleeve loose or coupling damage, each guide and paste plastic surface contact dye point is not uniform, re-precision with shovel, so that the contact surface dye point up to 80% or more, 0.02mm stopper does not enter for qualified.
Second, check the screw nut preload force is too strong or too loose. Adjust the preload force and check the axial rotation value so that the error is not more than 0.005mm.
Third, check the screw nut end face and combined surface is not vertical, combined with too loose, repair adjustment and repair processing, screw bearing seat preload force is too tight or too loose adjustment repair.
Fourth, the ball screw manufacturing error is large or axial falloff, with the control system automatic compensation can also eliminate the gap, measuring and adjusting the screw falloff with the instrument, insufficient lubricating oil or no adjustment of each guide surface lubricating oil.