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The maintenance of the dynamic and static pressure spindle of a surface grinder is the key to ensuring stable operation and machining accuracy of the grinder. Here are some detailed maintenance methods:
1、 Daily inspection
Start the hydraulic oil pump and observe the pressure: Before the hydraulic oil pump runs normally, the operator should first start the hydraulic oil pump and observe whether the total oil supply pressure is 2Mpa and whether the static pressure in the front and rear bearing oil chambers is around 1Mpa.
Check the rotation status of the grinding wheel shaft: Before starting, gently rotate the grinding wheel shaft by hand, and the spindle should be able to rotate easily without any obstruction. Note that the test should be conducted when the machine tool is stopped to ensure safety.
Operation under spindle oil supply: When replacing the spindle belt, grinding wheel, or conducting equipment debugging, it should be carried out under spindle oil supply to prevent the spindle and bearings from being pulled without oil.
Check the dynamic pressure: After starting the grinding wheel spindle, pay attention to checking whether the dynamic pressure of the grinding wheel spindle is between 3-3.5Mpa. If it reaches 4.5Mpa or above, stop the machine and check if the viscosity of the system oil is too high. If the viscosity of the oil is too high, there is a risk of holding the shaft.
Check the cleanliness of the spindle: Even a slight error in precision parts can affect the machining process, so operators cannot ignore checking the cleanliness of the dynamic and static pressure spindles to prevent foreign objects from entering.
Check the spindle lubricating oil: Lubricating oil can reduce the friction at the static pressure spindle connection, allowing it to operate better. Therefore, it is necessary to regularly check whether the lubricating oil of the spindle is sufficient and ensure its good quality.
2、 Regular maintenance
Cleaning and rust prevention: Clean the machine daily to prevent rust and maximize its accuracy and service life. If the grinder is idle for more than 2-3 days, the workbench should be cleaned and wiped dry, and rust proof oil should be applied to prevent the workbench from rusting. Check the lubrication condition of the grinding machine guide rail at designated locations every week, remove the grinding wheel flange, and perform rust prevention treatment on the surface of the spindle nose and the conical surface inside the flange to prevent the spindle and flange from rusting.
Replace hydraulic oil and spindle oil: The hydraulic oil and spindle oil must be kept clean, and the filter should be replaced regularly. The spindle oil needs to be replaced once a year, and the filter also needs to be replaced once a year.
Maintenance of spindle bearings: As a vulnerable component that determines the accuracy of machine tools, spindle bearings require regular maintenance and replacement. Do not replace or repair products only when problems are discovered during production to avoid affecting production progress and product quality.
3、 Professional maintenance
Repair spindle locking: If the spindle is locked, it may be caused by excessive wear or damage to the bearings. At this point, professional personnel are required to disassemble, inspect, and replace the bearings.
Adjusting grinder parameters: In order to ensure the stable operation of the dynamic and static pressure spindle, it is necessary to adjust the parameters of the grinder according to the machining requirements and equipment status, in order to reduce the load and wear of the spindle.
In summary, the maintenance of the dynamic and static pressure spindle of a surface grinder needs to start from three aspects: daily inspection, regular maintenance, and professional maintenance. By implementing these measures, the good operating condition and machining accuracy of the spindle can be ensured, thereby improving production efficiency and product quality.
