How to maintain the center machine of high-speed driller in the later stage?

The core of the later maintenance of the high-speed driller's center machine is * * "precision maintenance, component life extension and fault prevention". It is necessary to establish a hierarchical maintenance system by day, week, month and year, focusing on high-precision components (such as spindle, guide rail and tool magazine) and electrical system.

I. Daily maintenance (before and after daily operation)

Cleaning and maintenance

After machining, use a high-pressure air gun (pressure ≤0.6MPa) to clean the chips on the workbench, guide surface, tool magazine and spindle taper hole, so as to prevent the chips from scratching the guide rail or blocking the tool magazine.

Wipe the spindle end face and handle with cotton cloth, and apply a small amount of antirust oil to prevent the spindle taper hole from rusting or wearing; Clean the filter screen of the cooling water tank to prevent impurities from blocking the cooling pump.

State check

Check the liquid level of hydraulic oil, lubricating oil and coolant before starting, and replenish it in time when it is lower than the scale line (the oil of the specified model in the equipment manual is required).

Test whether the emergency stop button, travel limit and safety door interlock function are sensitive, and observe whether the fan of the electric cabinet is running normally to avoid excessive temperature in the control cabinet.

Parameter record

Record the load current when the spindle is running and the temperature of the servo motor when each spindle moves. If the current fluctuates abnormally or the temperature exceeds 40℃, stop the machine for investigation.

Second, the weekly maintenance (key lubrication and parts inspection)

Lubrication system maintenance

Check the automatic lubrication system of guide rail and ball screw to confirm whether the lubricating oil path is smooth and the oil output is even (usually 1-2 drops per hour). If the oil path is blocked, disassemble and clean the oil pipe.

Manually replenish the gear and bearing grease of the tool changing mechanism in the tool magazine (choose high-temperature lithium-based grease) to ensure smooth tool changing action and no jamming noise.

Preliminary accuracy check

Use a dial indicator to detect the radial runout of the spindle (allowable error ≤0.003mm). If it is out of tolerance, check the bearing clearance of the spindle, and adjust or replace the bearing if necessary.

Check the wear of the T-groove and locating pin of the workbench, and clean up the chips accumulated in the groove. If there are obvious scratches or excessive gaps, repair or replace them.

Electrical system inspection

Open the electrical cabinet, clean the dust inside with a vacuum cleaner (avoid blowing the circuit board directly with compressed air), check whether the terminal is loose and aging, and test the pull-in state of contactors and relays.

Third, monthly maintenance (in-depth maintenance of core components)

Spindle system maintenance

Disassemble the dust cover at the front end of the spindle, clean up the debris in the seal, and replace the aging seal ring to prevent the coolant from penetrating into the spindle and damaging the bearing.

Check the cooling system of the spindle (such as water cooling and oil cooling), clean the scale or oil stain of the cooler, ensure the cooling efficiency, and avoid the accuracy decline of the spindle due to overheating.

Servo and transmission system

Check the preload of the X, Y and Z axis ball screws. If there is any gap or vibration when the shafts move, adjust the preload of the nuts and replace the ball screws if necessary.

Test the parameter setting of the servo driver, and compare the original data. If the parameter drifts, it needs to be recalibrated to ensure that the servo system matches the motor.

Tool magazine and tool system

Check the clamping force of the tool holder in the tool magazine, and adjust the spring of the tool holder if the tool is loose; Clean the positioning sensor of tool magazine, and test the accuracy of tool changing position. If the tool changing error exceeds 0.005mm, it is necessary to recalibrate the tool changing coordinates.

Four, annual maintenance (comprehensive overhaul and precision calibration)

Full precision calibration

Invite professionals to use the laser interferometer to re-test the positioning accuracy, repetitive positioning accuracy and geometric accuracy (such as verticality and parallelism) of the X, Y and Z axes. If the deviation is out of tolerance, the accuracy should be recovered through system parameter compensation or mechanical adjustment.

Calibrate the verticality between the spindle and the workbench, and the parallelism between the spindle end face and the workbench to ensure that the machining benchmark accuracy meets the requirements.

Core component replacement

Replace the aging servo motor bearing and spindle bearing (original fittings are recommended), and replace the filter element and sealing ring of the hydraulic system to avoid sudden failure caused by aging parts.

Check the cooling water tank and hydraulic oil tank, thoroughly clean the inside of the tank, replace new coolant and hydraulic oil, and clean the filter screen of the oil tank.

System upgrade and backup

Back up the parameters and procedures of the machine tool control system to prevent the loss of parameters; If the equipment software is updated, you can contact the manufacturer to upgrade the system to improve the running stability and function.