Fault repair of 1 cases of traffic detection switch Fault phenomenon: NC grinding machine, a matching SIEMENS SINUMERIK 810 system, fault alarm F31 "SPINDLE COOLANT CIRCUIT", indicating a problem with the spindle cooling system.
Analysis and processing: check the cooling system is no problem, consult the PLC ladder diagram, the fault is detected by the flow switch B9.6 detected. Check that the switch is found to have been damaged, due to the switch, causing alarm error; replace the new switch, fault disappears.
Fault repair of 2 cases of hydraulic pressure instability Fault phenomenon: a special CNC milling machine, the fault occurred in the part batch processing, each failure occurred in the parts have been processed, the Z axis shift is not in place. Interrupt processing program, spindle stop, and display the F97 alarm "SPINDLES PEED NOT OK STATION 2", indicating a problem with the spindle. Analysis and treatment of problems: check the spindle system No. For other problems can also cause spindle stop, then use the machine programmer monitoring of PLC ladder diagram, running state, find the tool hydraulic clamping pressure detection switch F21.1 in the event of fault transient off, its off said cutter clamping force is not enough, for the sake of safety, PLC makes spindle stop. The inspection found hydraulic pressure instability; stable adjustment hydraulic system pressure to make, the fault is removed.
Fault repair 3 spindle tool alarm cases Fault phenomenon: a complete OKUMA OSP700 system, model for the XHAD765 numerically controlled machine tool, "spindle tool to detect abnormal" alarm, system in the emergency stop status.
Analysis and processing: the fault is due to a system that no knife spindle human in the spindle insert tool; or in the system that the spindle blade of the state, people took the spindle tool, then change the mode of operation after the occurrence. While the main sensor SQl0, SQll, SQl2 there is less likelihood of failure. As long as the way to switch back to zero, reset after starting, the tool in spindle removed or inserted, keeping the actual state and system inside the spindle tool condition to be consistent. If it were not for the reason of failure, then to open the PLC data or the trapezoidal chart check the three switch signals ISPTCl, ISPTL, ISPTUl whether the normal reception, and then check the switch has no fault.
Found SQll switch plugs into the oil poor contact according to the examination, treatment after the normal.
4 cases of machining spindle fault repair stall Fault phenomenon: a complete FANUC OMC system, model for the XH754 numerically controlled machine tool, in the course of the hole boring spindle, suddenly stopped, and the Z axis machine tool feed continue, without any warning, cutting tool, workpiece damage caused by.
Analysis and treatment of fault: the strange, it is difficult to determine. To confirm the fault, the workpiece is removed, let the machine empty program, unequal probability of the fault occurring, sometimes long time no fault, sometimes occurred. To determine whether due to interference caused by other machine tools, will be stopped, the ground re processing, fault still exists. Then from the related signal and spindle control start, check the relevant register PMC input and ladder diagram in the state. Found in the inspection, when the fault appears PMC → CNC signal G120.6 (spindle stop) is high, without a spindle to CNC stop instruction (G120.6 low, spindle stop); check and spindle steering related G229.4, G229.5, found in normal G229.4 highlight, spindle rotation, fault appears when the G229.4 goes out.
When the main shaft to maintain positive rotation, R728.4 by X04.5 R705.1 R728.4 normally closed, normally open, X016.7 R728.0 normally closed, normally open, R728.5 X016.1 normally closed, normally open, X016.2 normally closed to keep conduction (highlighted) and keep the G229.4 conduction, these contacts as long as there is a disconnect, positive rotation will stop: continue to observe that, is X016.1 short flashing led to R728.4 off, so that X016.1 has a problem. X016.1 as the main tool clamping position detection signal, the travel switch SQl2 remove opened for inspection, found that the spring has fast complete rupture. A new post, and then boot check, no fault.
Repair experience: this fault has exposed a little weakness on the design of the PMC control, the author believes that if you keep control of G121.5 series X016.1 as signal interlocking signal in feed, can avoid the spindle and feed to stop, to avoid the workpiece, cutting tool and machine damage; at the same time, it can increase the message display as a fault indication, convenient repair search. For X016.1 damage, PMC control is given in the corresponding alarm but the alarm is to delay, if the delay in X016.1 contacts are closed, the alarm will not appear; in this case, switch X016.1 is due to spring leaf fast break off, forming the instable situation in under the effect of vibration.
For many fault, find often can play a better effect with the help of PMC ladder diagram and the register. Fault repair alarm 5 spindle encoder cases Fault phenomenon: a complete FANUC OMC system, model for the XH754 numerically controlled machine tool spindle encoder, "1001Spindle Alarm", "409 Servo Alarm (serialerr)" alarm.
Analysis and processing: spindle servo digital tube display "AL-42", repair data suggest that as the main encoder a turn signal does not produce. Check the encoder cable normal; remove the spindle encoder, it found a layer of oil mist on the glass grating, anhydrous alcohol cleaning clothes on, after installation, boot, fault disappears; the spindle orientation after the readjustment, put into normal production.