Maintenance and upkeep requirements for CNC milling machines

As a high-precision processing equipment, the maintenance and upkeep of CNC milling machines are crucial for ensuring processing accuracy and extending their service life. The following are the comprehensive requirements for the maintenance and upkeep of CNC milling machines

I. Daily Maintenance Requirements

 cleaning work ‌ :

Clean the chips and dirt from the workbench, guide rails, coolant nozzles and other parts every day

Clean all parts of the machine tool with compressed air or a special cleaner

Keep the guide rails smooth to prevent jamming ‌

2. Lubrication system inspection ‌ :

Check whether the lubricating oil level is normal and whether the oil quality is clean

3.

Ensure that all lubrication points are lubricated on time, especially key parts such as high-speed rotating shafts and guide rails

Check whether the automatic lubrication system is working properly ‌

3. Cooling system inspection ‌ :

Make sure the coolant tank level is sufficient

Check whether the cooling pipeline is unobstructed and whether the nozzles are clogged

Change the coolant regularly and keep it clean ‌

4. Electrical system inspection ‌ :

Check whether all electrical components and circuits are loose or damaged

Check whether the emergency stop button is sensitive and reliable

Pay attention to checking whether the cooling fan in the electrical cabinet is working properly ‌

Ii. Regular maintenance projects

Weekly maintenance

Clean the air filter screen of the heat exchanger, the filter screen of the cooling pump and the lubricating oil pump

Check whether the tool pull bolts are loose and whether the handle is clean

Check whether the mechanical origin of the three axes is offset

Check whether the tool changer arm of the tool magazine operates smoothly or whether the tool disc of the tool magazine rotates smoothly ‌

Monthly maintenance

Perform a comprehensive lubrication on all the parts of the machine tool that require lubrication

Clean the coolant filter element and check the operating condition of the coolant pump

Check the temperature of each electrical component to see if there is any overheating

Check if the cable connection is firm ‌

Quarterly maintenance

Carry out a thorough cleaning of the entire machine tool, including the interior of the electrical cabinet

Check whether there is any abnormal noise from the oil tank and oil pump of the hydraulic system

Check whether the height of the working oil level is appropriate and whether the pressure gauge indication is normal

Check the pipelines and all joints for any leakage ‌

Ⅲ. Precautions for Use

1.Check ‌ before operation:

Check whether all mechanical components and the conditions of hydraulic and lubricating oil systems are normal

Check whether the doors of the power cabinet and the system cabinet are tightly closed

Before starting up, run the machine at low speed for 3 to 5 minutes to confirm if the lubrication system is unobstructed ‌

2.Processing precautions ‌ :

Before automatic milling processing, a simulation check should be conducted to ensure that the editing program is completely correct

Do not strike or clean the mechanical and system parts of the machine tool with hard objects

The contact surfaces of the sleeves on the milling cutter shank should be in close contact, and there should be no dust or iron filings ‌ in the middle

3.safety specifications ‌ :

Students undergoing practical training must dress as required, and their cuffs, collars and hems must be tightly fastened

Do not open the mechanical servo mechanism and switch when it is not in operation

When milling a workpiece, the head, hands and all non-processing items must not approach the milling area ‌

Iv. Preventive Measures for Common Faults

1.Spindle component failure prevention ‌ :

Regularly inspect the main shaft lubrication system to confirm the oil level and quality

Clean the breathing holes of the main shaft to prevent dust from entering

Avoid bearing wear caused by long-term overloading operation ‌

 2. Feed system failure prevention ‌ :

Regularly check the lubrication condition of the lead screw and remove the iron filings in the feed box of the lead screw nut pair

Check the tightness of the guide rail inserts and adjust the clearance

Avoid excessive backlash causing a decrease in machining accuracy ‌

3.Electrical system fault prevention ‌ :

Regularly back up the parameters of the numerical control system

Check the battery power of the system to prevent data loss

Keep the temperature inside the control cabinet appropriate and the ventilation good ‌

4. Prevention of knife collision ‌ :

Before inputting a program, it is necessary to strictly check whether its format, code and parameter selection are correct

Forgetting to turn off the air transport switch during processing may cause tool collision

After simulation processing, it is necessary to return to the reference point to ensure that the mechanical zero point coordinates are consistent with the actual position ‌