Efficient lubrication and maintenance of cold-rolled ball screws is the core to ensure their long-term stable operation and high-precision performance.
1. Lubrication treatment
Select lubricant:
The lubricants used in ball screws can be divided into two main types: lubricating oil and grease.
Lubricating oil is mainly used in full-loss systems and is particularly suitable for applications that require high speed and high precision.
Grease, such as lithium-based grease, is particularly suitable for low speed, high load or occasions that require a long lubrication time.
Lubrication method used:
Grease is injected into the nut through the grease injection hole on the body of the nut or the nut flange. Both ends of the nut are usually equipped with scrapers or sealing rings to avoid grease leakage and external contaminants.
Lubrication requirements: We need a lubrication device equipped with a pump and a filtration system. The lubricating oil will flow into the space of the nut from the oil hole of the housing and lubricate the ball screw in a timely and quantitative manner.
The lubrication time cycle is:
For grease-lubricated ball screws, it is recommended to replace the grease every six months, and apply new grease after cleaning the old grease.
Ball screws with oil lubrication characteristics can be refueled before each machine tool starts working to ensure that the ball screw is always in a good lubrication condition.
2. Maintenance
Regular inspections:
The working condition of the screw needs to be checked regularly to ensure that there is no abnormal noise or vibration. Once a problem is found, repair or replace the damaged parts immediately.
Please carefully check whether the connection between the screw support and the bed is loose, check whether the connection part is damaged, and observe the working condition and lubrication condition of the screw support bearing.
Measures for cleaning and protection:
Dust and other impurities on the surface of the screw should be removed regularly to prevent them from invading the interior of the screw and affecting its normal operation.
When the ball screw is exposed to the surface of the machine tool, it is recommended to use a sealed protective cover, such as a spiral spring steel belt sleeve, a retractable sleeve, and a foldable sleeve, etc., to avoid hard dust or chip contamination.
When the ball screw is in a place that is not easily noticed, it is recommended to use a sealing ring for protection, and this sealing ring should be installed on both sides of the nut.
Try to avoid overload work:
Make sure that the load that the screw can bear is kept within its tolerable range to avoid deformation or damage to the screw.
Ensure the accuracy of the device:
During the installation and use of the equipment, it is necessary to ensure the accuracy of the operation to prevent damage to the screw or loss of accuracy due to improper operation.
Monitoring of temperature:
By direct touch or using temperature measurement tools, we can observe whether the temperature of the screw after work has increased unusually. If the temperature is high, lubrication may be insufficient, so in this case, it is necessary to add or replace the lubricant.
Long-term out-of-use protection measures:
When the screw is not used for a long time, it must be properly protected and maintained to avoid adverse reactions such as rust.