①It Should Be Able To Ensure The Accuracy And Precision Of The Workpiece Being Processed.

①It should be able to ensure the accuracy and precision of the workpiece being processed.

How much will be lost if maintenance is not done properly?

Many factory owners think that as long as the CNC milling machine tool can run, this is a very wrong idea. Decreased accuracy of CNC machine tools often begins with neglect of routine maintenance. By the time it is discovered that the machining dimensions of parts do not meet standards, it has already resulted in a large amount of scrap and material waste.

For a milling machine tool with an accuracy of 0.01 mm, once the guide rails and screws lack lubrication for a relatively long period of time, the accuracy may be reduced to more than 0.03 mm within half a year. This will lead to a decrease in the product qualification rate, an increase in rework costs, and even an impact on the delivery schedule of the entire production line.

Daily must-do checks

Before starting the machine every day, the operator has to check the oil level of the lubricating oil tank to see if it meets the standard, and to see if the oil is clear and free of impurities. If you find that the oil level is lower than the minimum mark, you must replenish the specified lubricant type in time, and you must not mix different brands of lubricants at will.

Checking the coolant concentration and checking the coolant level are also tasks that must be done every day. If there is not enough coolant, the life of the tool will be greatly shortened, and the quality of the workpiece surface will also deteriorate. However, if the concentration of the coolant is too low, the anti-rust effect will be reduced, and the metal parts inside the machine tool will easily rust and be corroded, thus affecting the life of the machine tool.

Key maintenance contents every week

Every week, a thorough cleaning of the machine tool guide rails and screws must be carried out. The accumulated metal shavings and old oil must be wiped off with a clean cotton cloth. During the cleaning process, do not use hard objects to scratch the surface of the guide rail, otherwise it will leave scratches and affect the sliding accuracy. This is a mistake that many novices easily make.

Check whether the limit switches and travel stops of each axis are loose or displaced. If any abnormalities are found, make adjustments quickly until they are firmly fixed. At the same time, the chip accumulation inside the machine tool must be cleaned up, especially the chips surrounding the tool magazine and tool change mechanism. These residual metal chips will definitely affect the accuracy of the tool change action.

Monthly in-depth maintenance points

It is necessary to inspect the contact surface of the spindle taper hole and the tool shank every month, and use special cleaning agents to remove oil stains and tiny burrs. If the spindle taper hole is damaged or contaminated, the tool clamping will not be firm enough, resulting in vibration and jump during processing, which will have a direct impact on the processing accuracy and surface quality.

Check whether the filter of the electrical cabinet fan is clogged and clean it to avoid poor heat dissipation. If an electrical component overheats, its service life will be shortened, or even a fault alarm will be triggered and the system shut down. At the same time, check each connecting cable for aging and damage. Once a hidden danger is detected, replace it immediately.

Quarterly maintenance cannot be ignored

Lubricating oil and coolant must be replaced every three months. If old oil is used, it will lose its lubrication performance and produce acidic substances to corrode the machine tool. When replacing, completely drain the old oil in the oil tank and oil circuit, wait until it is flushed with new oil, and then add new lubricating oil to ensure that the oil circuit is in a clean state.

Check whether the machine tool level needs to be readjusted. Long-term operation may cause the anchor bolts to loosen. Use a precision level to check the level of the table. If the deviation exceeds 0.02 mm per meter, it must be leveled again. Otherwise, the machining accuracy and tool life will be affected.

Establishing maintenance records is critical

It is strongly recommended that every CNC milling machine tool should prepare a maintenance record book. The time of each maintenance must be recorded in detail. The content of maintenance also needs to be recorded in detail. Any problems found must also be clearly recorded. Doing so can not only help operators develop standardized habits, but also become a source of important troubleshooting clues when a fault occurs.

It is necessary to indicate the model of the replaced parts and the brand of maintenance products in the record book to facilitate subsequent procurement and traceability. It is necessary to review maintenance-related records regularly and analyze the patterns of faults. Based on this, potential problems can be discovered in advance, and the maintenance status can be changed from passive response to proactive prevention.

In your factory, what are the maintenance records for CNC machine tools? Have you ever suffered losses due to improper maintenance work? You are welcome to share your relevant experience in the comment area.