The majority of ball screw pair failures are caused by reduced motion quality, excessive backlash, mechanical creep, and poor lubrication. We will analyze the causes of different failure phenomena of ball screws and put forward corresponding solutions.
1. High roughness value of processed parts
1) The lubricating oil of the guide rail is not enough, causing the sliding plate to crawl
Method: Add lubricating oil to eliminate lubrication failure
2) The ball screw is partially rough or damaged
Method: Replace or repair the screw
3) The screw bearing is damaged and the movement is not stable
Method: Replace damaged bearings
4)The servo motor is not adjusted well, and the gain is too large
Method: Adjust the servo motor control system
2. Large reverse error and unstable processing accuracy
1) Loose cone sleeve of screw shaft coupling
Method: Retighten and repeat the test with a dial indicator
2) The screw shaft slide plate is too tight or too loose with the pressure plate
Method: Re-adjust or repair, use 0.03mm ruler to be qualified
3)Screw shaft slide with wedge iron is too tight or too loose
Method: Re-adjust or repair to make the contact rate reach over 70%
3. Too large torque of the ball screws
1) Two skateboards cooperate with the pressure plate too tight or damaged
Method: Readjust or repair the pressure plate to make the 0.04mm caliper plug not qualified
2) The ball screw nut reverser is damaged, the ball screw is stuck or the shaft end nut pretension is too large
Method: Repair or replace the screw and adjust it carefully
3) Servo motor and ball screw are connected to different shafts
Method: Adjust the coaxial and tighten the connection seat
4. Poor lubrication of screw nut
1) Whether the oil separator divides the oil
Method: Check the quantitative oil separator
2) Whether the oil pipe is blocked
Method: Remove dirt and make the tubing unblocked
5. Ball screw noise
1) The ball screw bearing gland is not pressed properly
Method: Adjust the gland to make it tight against the bearing
2) Poor lubrication of ball screw
Method: Check the oil separator and the oil circuit to make sure the oil is sufficient
