Four common faults and solutions for vertical milling centers

1. Spindle system failure
Common manifestations: Vertical milling center spindle heating, abnormal vibration or reduced machining accuracy; spindle axial/radial movement (such as cylindricality out of tolerance, surface roughness not up to standard); unstable tool clamping leading to tool drop.
Solution: Replace the spindle bearing regularly when the bearing is worn or lubricated insufficiently, use high-viscosity grease, and calibrate the bearing preload to a clearance of 0.01-0.02mm. Grind the contact surface of the tapered hole or replace the clamping spring to ensure that the runout error is within the standard range.

2. Tool magazine and tool change system failure
Common manifestations: The tool magazine cannot rotate or the tool change is stuck in the middle; tool release failure (the tool cannot be released or clamped); tool position count error.
Solution: Insufficient air pressure or solenoid valve failure is to check the air source pressure in time, replace the damaged tool release solenoid valve or clean the oil circuit. Correct the balance of the knife arm when the manipulator or knife arm is deformed, check the wear of the transmission chain and lubricate it.

3. Lubrication and cooling system failure
Common manifestations: Insufficient lubrication of the guide rail or screw leads to creeping; the cooling pump cannot be started or the flow is insufficient
Deterioration of the cutting fluid causes corrosion of components.
Treatment method: Clean the filter (recommended once a month), replace the oil pump check valve, monitor the pH value (recommended 8.5-9.5), regularly replace the cutting fluid and clean the bacteria in the water tank and check the sealing of the joints.

4. Wear of guide rails and screws
Common manifestations: vibration marks or dimensional deviations appear on the machined surface; increased axial reverse clearance; abnormal noise or increased resistance when moving.
Treatment method: adjust the guide bar gap to 0.04-0.1mm, ensure that the feeler gauge cannot be inserted, use a laser interferometer to calibrate the reverse clearance, and compensate for parameter errors.