ball screw heating

A ball screw is used machine also very heating. What could be the cause of

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Hi S.Bora ERFİDAN

I have listed below some things to check, to try and identify problem with heat generated in the ball screw of your machine.as it could be caused by one or a number of different problems. Hopefully by working through the list of checks systematically you will hopefully identify the cause of your problem.
But before before proceeding, has any work been carried out to the ball screw recently, as this may also identify the source of your problem so it may be worth checking that one out first :)) as we have all been caught out by not looking for the obvious.

1. Check for backlash in the ball nut
2. Check for fatigue or distress along the surface of the screw to see if there is any pitting or spalling (chipping, fragmentation, or separation of a surface or surface coating)
3. Check for discoloration on the lead or the balls in the ball-screw
4. Check the ball screw seals and wipers to identify if they are loose or if fact missing and that the wipes are in contact with the screw. If they are not contaminates will for sure be entering the ball nut assembly, causing restriction and wear to the housing, the lead and the balls.
5. Check for vibration when the ball screw is moving, this is normally cause by a bent or poorly supported ball screw. If the ball screw is long there could possibly be excessive sag causing the lead to come into contact with the faces of the nut.
6. Check bearing housings for misalignment
7. Check that the machine is level
8. Check that there is not a build up of swarf under the way covers which will cause the ball tubes to become damaged
9. Check for brinelling (pattern on the surface) typically caused by a crash on the screw threads
10. Check bearings (nearly forgot that one )
11. Look for ball bearing skid marks-typical this is caused by poor lubrication
12. Look for flat spots on the ball bearings
13. Check all lube lines, fittings, connections for damage
14. Check the lubrication oil for contaminants, and inspect the lubrication tank for contaminants on bottom and make sure the pump filters have been cleaned.
15. If the ball screw is pre-loaded check to see if the pre-load is sufficient otherwise there will defiantly be backlash. Also check to see if there is excessive preload as, excessive ball nut preload can cause crashing of the nut into bearing housings or end stops.

Note
.Long screws mounted horizontally may sag due to the weight of the screw. If the sag is significant, the screw threads will be compressed on the top section of the screw and extended on the bottom section of the screw. In severe cases, the nut may actually seize on the screw as the running clearance between the screw and nut threads disappears.

Hope that this is of some help to you, if you require any further assistance or need a more detailed answer feel free to contact me either at gradcad or directly, my email address is alanbaird1960@hotmail.co.uk

Document attached so that you can print it out

Kind Regards
Alan Baird

 
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