1. Handwheel failure
the reason:
1. Poor contact of handwheel shaft selector switch
2. Poor contact of handwheel override switch
3. Handwheel pulse generator is damaged
4. Handwheel connection line is broken
2. X Y Z axis and spindle box failure
the reason:
1. Deformation and damage of the Y Z axis protective cover
2. Y Z shaft drive bearing is damaged
3. The service parameters do not match the mechanical characteristics.
4. The servo motor is connected with the screw head deformed, and the axis is different
5. The upper and lower guide rails of the heavy hammer in the column are loose and offset
6. Column weight chain and guide wheel wear vibration
7. Shaft pulley and motor end pulley are not parallel
8. The spindle belt is damaged or deformed.
Third, the guide rail oil pump, cutting oil pump failure
the reason:
1. Insufficient oil level of the rail oil pump
2. The oil pressure valve of the rail oil pump is damaged
3. Damaged machine oil circuit
4. The filter screen of the pump core of the guide rail oil pump is blocked
5. The quality of the guide rail oil purchased by the customer exceeds the standard
6. The oil pumping time of the guide rail oil pump is set incorrectly
7. The cutting oil pump is overloaded and the circuit breaker in the electric box is tripped
8. Air leakage from cutting oil pump joint
9. Damage to the one-way valve of the cutting oil pump
10. Short circuit of cutting oil pump motor coil
11. Cutting oil pump motor reverses
Four, processing failure
the reason:
1. X Y Z axis backlash compensation is incorrect
2. X Y Z Loose to the main insert
3. X Y Z Bearing is damaged
4 Deviation of mechanical geometric accuracy of the fuselage
5. Spindle axial and radial movement
6. Improper adjustment of system servo parameters and processing parameters
7. Incorrect customer programming
8. X Y Z axis screw, the screw nut is worn.
Five, loose knife failure
the reason:
1. Broken knife solenoid valve
2. Damaged spindle cutter cylinder
3. Spindle spring is damaged
4. Spindle claw is damaged
5. Insufficient customer air supply
6. Poor contact of the knife release button
7. Broken line
8. Lack of oil in the oil cup of the knife cylinder
9. Customer tool handle Latin does not meet the required specifications
Six, the machine tool cannot return to zero
the reason:
1. The origin switch contact is stuck and cannot move
2. The origin stop can not press the origin switch to the switch action position
3. Water in the origin switch leads to poor contact of the switch contacts
4. The origin switch circuit is disconnected or the input signal source is faulty
5. PLC input point burned out
Countermeasures:
1. Clean the jammed part to make the moving part move smoothly, or replace the travel switch
2. Adjust the installation position of the travel switch so that the zero switch contact can be smoothly pressed to the switch action position by the stop
3. Replace the limit switch and take waterproof measures
4. Check whether the switch circuit is open or short circuit, whether there is a signal source (+24V DC power supply)
5. Replace the input points on the I/O board, set the parameters, and modify the PLC program
Seven, CNC machining center positive and negative hard limit alarm
Under normal circumstances, this alarm will not occur. It may occur when the CNC machining center is operated before the zero return. Because the system does not have a fixed mechanical coordinate system before returning to zero, it is positioned at will, and the soft limit is invalid, so before operating the CNC machining center Must first go to zero
the reason:
1. The travel switch contact is pressed and stuck (over travel)
2. Damaged travel switch
3. There is an open circuit, short circuit and no signal source in the limit switch circuit
4. The limit stop can not press the switch contact to the action position
5. PLC input point burned out
8. Tool change failure
the reason:
1. Insufficient air pressure
2. The knife release button is in poor contact or the circuit is open
3. The PLC input address point of the knife release button is burned out or there is no signal source (+24V)
4. The loose knife relay does not move
5. Broken knife solenoid valve
6. Insufficient punch
7. Lack of oil in the oil cup of the knife cylinder
8. Cylinder failure
Nine, the sound is abnormal when the three-axis is running
the reason:
1. The bearing is faulty
2. Screw bus and guide rail are unbalanced
3. Severe wear of the wear plate causes serious scratches on the guide rail
4. Servo motor gain does not match
10. Lubrication failure
the reason:
1. Lubrication pump oil tank is out of oil
2. Lubrication pump oiling time is too short
3. Pressure relief of lubrication pump pressure relief mechanism is too fast
4. There is oil leakage in the oil line of the tubing
5. The one-way valve in the oil circuit does not operate
6. The oil pump motor is damaged
7. The lubrication pump control circuit board is damaged
11. The program cannot be transferred, and P460, P461, P462 alarms appear
12. Tool magazine problem
the reason:
1. Suddenly stop during tool change, and tool change cannot be continued
2. Hat-style tool magazine can't come out
3. Do not loosen the tool during tool change
4. The knife can't spin
5. The cutter head suddenly rotates in the reverse direction, the time difference is half a tool position
6. When changing the tool, an error alarm of loosening and tightening of the tool occurs
7. The sound of the spindle side is very loud when the tool is returned during the change process
8. After the replacement, the spindle cannot be installed with the tool (abnormal loose tool)
13. The CNC machining center cannot be powered on
the reason:
1. The three-phase contact of the main power switch is poor or the switch is damaged
2. The operation panel cannot be powered on
14. Cooling water pump failure
1. Check whether the water pump is burnt out
2. Whether the power phase sequence is reversed
3. AC contact, whether the relay is burned out
4. Whether the panel button switch has input signal
15. Blow failure
1. Check whether the solenoid valve is moving
2. Check whether the blowing relay is active
3. Whether the panel buttons and PLC output interface have signals
When faced with CNC machining center failures, carefully analyze the causes and find solutions. For example, X, Y, Z axis and spindle box failures may be caused by the deformation of the protective cover. At this time, the protective cover must be replaced in time. , Return to normal use. The protective cover is a small accessory on the machining center, but it also plays a vital role. Good quality protective covers can reduce the failure rate of machine tools.
