As high-precision industrial equipment, the performance stability and service life of a CNC double-column metal sawing machine directly depend on the scientific execution of its maintenance and upkeep. Proper maintenance not only reduces the failure rate but also maintains cutting accuracy and operational efficiency, ensuring consistent production output. The following elaborates on three aspects: daily maintenance, regular upkeep, and fault prevention.
Daily Maintenance: Basic Maintenance Required Every Day
Daily maintenance should be performed before and after each work shift. Though simple, it can effectively prevent most common failures.
1. Inspection and Cleaning of the Saw Blade System
After cutting, immediately clean iron filings and oil from the surface of the saw blade using a dedicated brush to prevent debris buildup, which can cause blade imbalance. When cutting high-viscosity materials (e.g., aluminum alloys), rinse the blade teeth with kerosene to prevent material adhesion that could affect subsequent cutting accuracy.
Check the tightness of the saw blade fastening nut to ensure it is not loose. Inspect the blade for cracks, missing teeth, or wobbling. If any abnormalities are found, stop the machine immediately and replace the blade. It is strictly forbidden to use a damaged saw blade.
2. Lubrication of Guide Rails and Sliding Parts
Before daily startup, apply special guide rail lubricating oil (recommended viscosity grade ISO VG32) to the sliding parts, such as the double-column guide rail and the worktable slider. Apply enough oil to form a thin overflowing film on the rail surface.
Start the machine and let it idle for 1–2 minutes to evenly distribute the oil and reduce friction. Note: Never operate the equipment without lubrication.
3. Maintenance of the Cooling and Chip Removal System
Check the coolant level in the tank to ensure it is sufficient (not below two-thirds of the tank scale). If low, top up with the same coolant type (a water-soluble cutting fluid is recommended at a concentration of 5%–8%).
Clear iron chips from the chip trough to ensure the chip removal motor operates smoothly and prevent the worktable from jamming due to chip blockage. If removal is inefficient, disassemble the side plate of the chip removal unit for thorough cleaning.
4. Visual Inspection of the Electrical System
Check that indicator lights on the control panel are functioning properly and ensure buttons and knobs are not stuck. Confirm that the plugs of the power and signal cables are secure and that cable sheaths are intact to avoid short circuits or poor contact.
Regular Maintenance: Periodic Deep Maintenance (Based on Operating Hours)
1. Weekly Maintenance
Transmission System Inspection
Open the equipment's side cover and inspect the pulley and belt for wear. The belt tension should allow for a 10–15 mm depression when pressed. If too loose, cutting power may be insufficient; if too tight, bearing wear may accelerate.
Fixture System Calibration
Use a dial indicator to check the fixture's positioning accuracy. If the perpendicularity deviation between the clamping surface and saw blade exceeds 0.05 mm/m, adjust the set screw at the fixture base to correct the alignment, ensuring firm and accurate clamping.
2. Monthly Maintenance
Lubrication System Overhaul
Replace the gearbox lubricating oil (first replacement after 100 hours, then every 500 hours). Use extreme-pressure gear oil (ISO VG150). Drain old oil completely, flush the gearbox with fresh oil, then add the specified amount of new oil.
Guide Rail Accuracy Check
Use a level to check the flatness of the double-column guide rail. If longitudinal deviation exceeds 0.02 mm/m, adjust the shims under the equipment to restore proper alignment, ensuring smooth saw frame movement during operation.
3. Quarterly Maintenance
Numerical Control System Cleaning
After disconnecting the power, clean dust from the CNC cabinet using compressed air (≤0.5 MPa), focusing on the cooling fan and filter screen. Check system battery voltage (≥3V); if low, replace with a compatible battery promptly to prevent data loss.
Hydraulic System Inspection (For hydraulic clamping models)
Inspect oil level and quality in the hydraulic tank. If oil appears turbid or emulsified, replace it completely and clean the hydraulic filter. Check the sealing performance of the clamping cylinder; if leakage is found, replace the sealing ring.
Fault Prevention and Handling of Special Circumstances
1. Seasonal Maintenance Tips
Summer: Ensure the CNC cabinet's cooling fan is operational. If ambient temperatures exceed 35 °C, install workshop air conditioning to avoid overheating alarms.
Winter: Preheat the machine for 10–15 minutes before startup. Monitor the lubrication system's oil flow. If temperatures drop below –5 °C, replace with low-temperature-specific lubricating oil.
2. Long-Term Shutdown Maintenance
If the machine is unused for more than one month:
Release fixture clamping force, raise the saw blade to the highest position, and apply anti-rust oil to all moving parts.
Disconnect the main power supply, unplug the equipment, and apply waterproof and dustproof measures.
Power on and run the machine idle for 30 minutes once a week to prevent electrical component moisture and aging.
3. Handling Common Exceptions
If abnormal noise or excessive vibration is observed, stop the machine immediately to inspect the saw blade's dynamic balance. Recalibrate or replace as needed.
If cutting accuracy drops suddenly, check for wear or insufficient lubrication of the guide rail, then recalibrate CNC parameters if necessary.
By strictly following the above maintenance procedures, the trouble-free operating time of a CNC double-column metal sawing machine can be extended by over 50%, and its cutting accuracy retention can last 3 to 5 years. It is recommended to establish an equipment maintenance log, documenting the time, content, and replaced parts of each maintenance session to support full life cycle management of the equipment.
